SemaDecl.cpp revision b5a0187b12524d2c1e6ac96e81715d1e70bbe0ad
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->isCompleteDefinition() && 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->isCompleteDefinition()) || 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 case DeclSpec::TST_atomic: { 3016 // Grab the type from the parser. 3017 TypeSourceInfo *TSI = 0; 3018 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3019 if (T.isNull() || !T->isDependentType()) break; 3020 3021 // Make sure there's a type source info. This isn't really much 3022 // of a waste; most dependent types should have type source info 3023 // attached already. 3024 if (!TSI) 3025 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3026 3027 // Rebuild the type in the current instantiation. 3028 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3029 if (!TSI) return true; 3030 3031 // Store the new type back in the decl spec. 3032 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3033 DS.UpdateTypeRep(LocType); 3034 break; 3035 } 3036 3037 case DeclSpec::TST_typeofExpr: { 3038 Expr *E = DS.getRepAsExpr(); 3039 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3040 if (Result.isInvalid()) return true; 3041 DS.UpdateExprRep(Result.get()); 3042 break; 3043 } 3044 3045 default: 3046 // Nothing to do for these decl specs. 3047 break; 3048 } 3049 3050 // It doesn't matter what order we do this in. 3051 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3052 DeclaratorChunk &Chunk = D.getTypeObject(I); 3053 3054 // The only type information in the declarator which can come 3055 // before the declaration name is the base type of a member 3056 // pointer. 3057 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3058 continue; 3059 3060 // Rebuild the scope specifier in-place. 3061 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3062 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3063 return true; 3064 } 3065 3066 return false; 3067} 3068 3069Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3070 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3071 /*IsFunctionDefinition=*/false); 3072} 3073 3074/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3075/// If T is the name of a class, then each of the following shall have a 3076/// name different from T: 3077/// - every static data member of class T; 3078/// - every member function of class T 3079/// - every member of class T that is itself a type; 3080/// \returns true if the declaration name violates these rules. 3081bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3082 DeclarationNameInfo NameInfo) { 3083 DeclarationName Name = NameInfo.getName(); 3084 3085 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3086 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3087 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3088 return true; 3089 } 3090 3091 return false; 3092} 3093 3094Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3095 MultiTemplateParamsArg TemplateParamLists, 3096 bool IsFunctionDefinition) { 3097 // TODO: consider using NameInfo for diagnostic. 3098 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3099 DeclarationName Name = NameInfo.getName(); 3100 3101 // All of these full declarators require an identifier. If it doesn't have 3102 // one, the ParsedFreeStandingDeclSpec action should be used. 3103 if (!Name) { 3104 if (!D.isInvalidType()) // Reject this if we think it is valid. 3105 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3106 diag::err_declarator_need_ident) 3107 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3108 return 0; 3109 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3110 return 0; 3111 3112 // The scope passed in may not be a decl scope. Zip up the scope tree until 3113 // we find one that is. 3114 while ((S->getFlags() & Scope::DeclScope) == 0 || 3115 (S->getFlags() & Scope::TemplateParamScope) != 0) 3116 S = S->getParent(); 3117 3118 DeclContext *DC = CurContext; 3119 if (D.getCXXScopeSpec().isInvalid()) 3120 D.setInvalidType(); 3121 else if (D.getCXXScopeSpec().isSet()) { 3122 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3123 UPPC_DeclarationQualifier)) 3124 return 0; 3125 3126 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3127 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3128 if (!DC) { 3129 // If we could not compute the declaration context, it's because the 3130 // declaration context is dependent but does not refer to a class, 3131 // class template, or class template partial specialization. Complain 3132 // and return early, to avoid the coming semantic disaster. 3133 Diag(D.getIdentifierLoc(), 3134 diag::err_template_qualified_declarator_no_match) 3135 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3136 << D.getCXXScopeSpec().getRange(); 3137 return 0; 3138 } 3139 bool IsDependentContext = DC->isDependentContext(); 3140 3141 if (!IsDependentContext && 3142 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3143 return 0; 3144 3145 if (isa<CXXRecordDecl>(DC)) { 3146 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3147 Diag(D.getIdentifierLoc(), 3148 diag::err_member_def_undefined_record) 3149 << Name << DC << D.getCXXScopeSpec().getRange(); 3150 D.setInvalidType(); 3151 } else if (isa<CXXRecordDecl>(CurContext) && 3152 !D.getDeclSpec().isFriendSpecified()) { 3153 // The user provided a superfluous scope specifier inside a class 3154 // definition: 3155 // 3156 // class X { 3157 // void X::f(); 3158 // }; 3159 if (CurContext->Equals(DC)) 3160 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3161 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3162 else 3163 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3164 << Name << D.getCXXScopeSpec().getRange(); 3165 3166 // Pretend that this qualifier was not here. 3167 D.getCXXScopeSpec().clear(); 3168 } 3169 } 3170 3171 // Check whether we need to rebuild the type of the given 3172 // declaration in the current instantiation. 3173 if (EnteringContext && IsDependentContext && 3174 TemplateParamLists.size() != 0) { 3175 ContextRAII SavedContext(*this, DC); 3176 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3177 D.setInvalidType(); 3178 } 3179 } 3180 3181 if (DiagnoseClassNameShadow(DC, NameInfo)) 3182 // If this is a typedef, we'll end up spewing multiple diagnostics. 3183 // Just return early; it's safer. 3184 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3185 return 0; 3186 3187 NamedDecl *New; 3188 3189 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3190 QualType R = TInfo->getType(); 3191 3192 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3193 UPPC_DeclarationType)) 3194 D.setInvalidType(); 3195 3196 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3197 ForRedeclaration); 3198 3199 // See if this is a redefinition of a variable in the same scope. 3200 if (!D.getCXXScopeSpec().isSet()) { 3201 bool IsLinkageLookup = false; 3202 3203 // If the declaration we're planning to build will be a function 3204 // or object with linkage, then look for another declaration with 3205 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3206 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3207 /* Do nothing*/; 3208 else if (R->isFunctionType()) { 3209 if (CurContext->isFunctionOrMethod() || 3210 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3211 IsLinkageLookup = true; 3212 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3213 IsLinkageLookup = true; 3214 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3215 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3216 IsLinkageLookup = true; 3217 3218 if (IsLinkageLookup) 3219 Previous.clear(LookupRedeclarationWithLinkage); 3220 3221 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3222 } else { // Something like "int foo::x;" 3223 LookupQualifiedName(Previous, DC); 3224 3225 // Don't consider using declarations as previous declarations for 3226 // out-of-line members. 3227 RemoveUsingDecls(Previous); 3228 3229 // C++ 7.3.1.2p2: 3230 // Members (including explicit specializations of templates) of a named 3231 // namespace can also be defined outside that namespace by explicit 3232 // qualification of the name being defined, provided that the entity being 3233 // defined was already declared in the namespace and the definition appears 3234 // after the point of declaration in a namespace that encloses the 3235 // declarations namespace. 3236 // 3237 // Note that we only check the context at this point. We don't yet 3238 // have enough information to make sure that PrevDecl is actually 3239 // the declaration we want to match. For example, given: 3240 // 3241 // class X { 3242 // void f(); 3243 // void f(float); 3244 // }; 3245 // 3246 // void X::f(int) { } // ill-formed 3247 // 3248 // In this case, PrevDecl will point to the overload set 3249 // containing the two f's declared in X, but neither of them 3250 // matches. 3251 3252 // First check whether we named the global scope. 3253 if (isa<TranslationUnitDecl>(DC)) { 3254 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3255 << Name << D.getCXXScopeSpec().getRange(); 3256 } else { 3257 DeclContext *Cur = CurContext; 3258 while (isa<LinkageSpecDecl>(Cur)) 3259 Cur = Cur->getParent(); 3260 if (!Cur->Encloses(DC)) { 3261 // The qualifying scope doesn't enclose the original declaration. 3262 // Emit diagnostic based on current scope. 3263 SourceLocation L = D.getIdentifierLoc(); 3264 SourceRange R = D.getCXXScopeSpec().getRange(); 3265 if (isa<FunctionDecl>(Cur)) 3266 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3267 else 3268 Diag(L, diag::err_invalid_declarator_scope) 3269 << Name << cast<NamedDecl>(DC) << R; 3270 D.setInvalidType(); 3271 } 3272 } 3273 } 3274 3275 if (Previous.isSingleResult() && 3276 Previous.getFoundDecl()->isTemplateParameter()) { 3277 // Maybe we will complain about the shadowed template parameter. 3278 if (!D.isInvalidType()) 3279 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3280 Previous.getFoundDecl())) 3281 D.setInvalidType(); 3282 3283 // Just pretend that we didn't see the previous declaration. 3284 Previous.clear(); 3285 } 3286 3287 // In C++, the previous declaration we find might be a tag type 3288 // (class or enum). In this case, the new declaration will hide the 3289 // tag type. Note that this does does not apply if we're declaring a 3290 // typedef (C++ [dcl.typedef]p4). 3291 if (Previous.isSingleTagDecl() && 3292 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3293 Previous.clear(); 3294 3295 bool Redeclaration = false; 3296 bool AddToScope = true; 3297 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3298 if (TemplateParamLists.size()) { 3299 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3300 return 0; 3301 } 3302 3303 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3304 } else if (R->isFunctionType()) { 3305 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3306 move(TemplateParamLists), 3307 IsFunctionDefinition, Redeclaration, 3308 AddToScope); 3309 } else { 3310 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3311 move(TemplateParamLists), 3312 Redeclaration); 3313 } 3314 3315 if (New == 0) 3316 return 0; 3317 3318 // If this has an identifier and is not an invalid redeclaration or 3319 // function template specialization, add it to the scope stack. 3320 if (New->getDeclName() && AddToScope && 3321 !(Redeclaration && New->isInvalidDecl())) 3322 PushOnScopeChains(New, S); 3323 3324 return New; 3325} 3326 3327/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3328/// types into constant array types in certain situations which would otherwise 3329/// be errors (for GCC compatibility). 3330static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3331 ASTContext &Context, 3332 bool &SizeIsNegative, 3333 llvm::APSInt &Oversized) { 3334 // This method tries to turn a variable array into a constant 3335 // array even when the size isn't an ICE. This is necessary 3336 // for compatibility with code that depends on gcc's buggy 3337 // constant expression folding, like struct {char x[(int)(char*)2];} 3338 SizeIsNegative = false; 3339 Oversized = 0; 3340 3341 if (T->isDependentType()) 3342 return QualType(); 3343 3344 QualifierCollector Qs; 3345 const Type *Ty = Qs.strip(T); 3346 3347 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3348 QualType Pointee = PTy->getPointeeType(); 3349 QualType FixedType = 3350 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3351 Oversized); 3352 if (FixedType.isNull()) return FixedType; 3353 FixedType = Context.getPointerType(FixedType); 3354 return Qs.apply(Context, FixedType); 3355 } 3356 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3357 QualType Inner = PTy->getInnerType(); 3358 QualType FixedType = 3359 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3360 Oversized); 3361 if (FixedType.isNull()) return FixedType; 3362 FixedType = Context.getParenType(FixedType); 3363 return Qs.apply(Context, FixedType); 3364 } 3365 3366 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3367 if (!VLATy) 3368 return QualType(); 3369 // FIXME: We should probably handle this case 3370 if (VLATy->getElementType()->isVariablyModifiedType()) 3371 return QualType(); 3372 3373 Expr::EvalResult EvalResult; 3374 if (!VLATy->getSizeExpr() || 3375 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3376 !EvalResult.Val.isInt()) 3377 return QualType(); 3378 3379 // Check whether the array size is negative. 3380 llvm::APSInt &Res = EvalResult.Val.getInt(); 3381 if (Res.isSigned() && Res.isNegative()) { 3382 SizeIsNegative = true; 3383 return QualType(); 3384 } 3385 3386 // Check whether the array is too large to be addressed. 3387 unsigned ActiveSizeBits 3388 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3389 Res); 3390 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3391 Oversized = Res; 3392 return QualType(); 3393 } 3394 3395 return Context.getConstantArrayType(VLATy->getElementType(), 3396 Res, ArrayType::Normal, 0); 3397} 3398 3399/// \brief Register the given locally-scoped external C declaration so 3400/// that it can be found later for redeclarations 3401void 3402Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3403 const LookupResult &Previous, 3404 Scope *S) { 3405 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3406 "Decl is not a locally-scoped decl!"); 3407 // Note that we have a locally-scoped external with this name. 3408 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3409 3410 if (!Previous.isSingleResult()) 3411 return; 3412 3413 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3414 3415 // If there was a previous declaration of this variable, it may be 3416 // in our identifier chain. Update the identifier chain with the new 3417 // declaration. 3418 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3419 // The previous declaration was found on the identifer resolver 3420 // chain, so remove it from its scope. 3421 3422 if (S->isDeclScope(PrevDecl)) { 3423 // Special case for redeclarations in the SAME scope. 3424 // Because this declaration is going to be added to the identifier chain 3425 // later, we should temporarily take it OFF the chain. 3426 IdResolver.RemoveDecl(ND); 3427 3428 } else { 3429 // Find the scope for the original declaration. 3430 while (S && !S->isDeclScope(PrevDecl)) 3431 S = S->getParent(); 3432 } 3433 3434 if (S) 3435 S->RemoveDecl(PrevDecl); 3436 } 3437} 3438 3439llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3440Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3441 if (ExternalSource) { 3442 // Load locally-scoped external decls from the external source. 3443 SmallVector<NamedDecl *, 4> Decls; 3444 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3445 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3446 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3447 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3448 if (Pos == LocallyScopedExternalDecls.end()) 3449 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3450 } 3451 } 3452 3453 return LocallyScopedExternalDecls.find(Name); 3454} 3455 3456/// \brief Diagnose function specifiers on a declaration of an identifier that 3457/// does not identify a function. 3458void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3459 // FIXME: We should probably indicate the identifier in question to avoid 3460 // confusion for constructs like "inline int a(), b;" 3461 if (D.getDeclSpec().isInlineSpecified()) 3462 Diag(D.getDeclSpec().getInlineSpecLoc(), 3463 diag::err_inline_non_function); 3464 3465 if (D.getDeclSpec().isVirtualSpecified()) 3466 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3467 diag::err_virtual_non_function); 3468 3469 if (D.getDeclSpec().isExplicitSpecified()) 3470 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3471 diag::err_explicit_non_function); 3472} 3473 3474NamedDecl* 3475Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3476 QualType R, TypeSourceInfo *TInfo, 3477 LookupResult &Previous, bool &Redeclaration) { 3478 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3479 if (D.getCXXScopeSpec().isSet()) { 3480 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3481 << D.getCXXScopeSpec().getRange(); 3482 D.setInvalidType(); 3483 // Pretend we didn't see the scope specifier. 3484 DC = CurContext; 3485 Previous.clear(); 3486 } 3487 3488 if (getLangOptions().CPlusPlus) { 3489 // Check that there are no default arguments (C++ only). 3490 CheckExtraCXXDefaultArguments(D); 3491 } 3492 3493 DiagnoseFunctionSpecifiers(D); 3494 3495 if (D.getDeclSpec().isThreadSpecified()) 3496 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3497 if (D.getDeclSpec().isConstexprSpecified()) 3498 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3499 << 1; 3500 3501 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3502 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3503 << D.getName().getSourceRange(); 3504 return 0; 3505 } 3506 3507 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3508 if (!NewTD) return 0; 3509 3510 // Handle attributes prior to checking for duplicates in MergeVarDecl 3511 ProcessDeclAttributes(S, NewTD, D); 3512 3513 CheckTypedefForVariablyModifiedType(S, NewTD); 3514 3515 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3516} 3517 3518void 3519Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3520 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3521 // then it shall have block scope. 3522 // Note that variably modified types must be fixed before merging the decl so 3523 // that redeclarations will match. 3524 QualType T = NewTD->getUnderlyingType(); 3525 if (T->isVariablyModifiedType()) { 3526 getCurFunction()->setHasBranchProtectedScope(); 3527 3528 if (S->getFnParent() == 0) { 3529 bool SizeIsNegative; 3530 llvm::APSInt Oversized; 3531 QualType FixedTy = 3532 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3533 Oversized); 3534 if (!FixedTy.isNull()) { 3535 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3536 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3537 } else { 3538 if (SizeIsNegative) 3539 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3540 else if (T->isVariableArrayType()) 3541 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3542 else if (Oversized.getBoolValue()) 3543 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3544 else 3545 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3546 NewTD->setInvalidDecl(); 3547 } 3548 } 3549 } 3550} 3551 3552 3553/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3554/// declares a typedef-name, either using the 'typedef' type specifier or via 3555/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3556NamedDecl* 3557Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3558 LookupResult &Previous, bool &Redeclaration) { 3559 // Merge the decl with the existing one if appropriate. If the decl is 3560 // in an outer scope, it isn't the same thing. 3561 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3562 /*ExplicitInstantiationOrSpecialization=*/false); 3563 if (!Previous.empty()) { 3564 Redeclaration = true; 3565 MergeTypedefNameDecl(NewTD, Previous); 3566 } 3567 3568 // If this is the C FILE type, notify the AST context. 3569 if (IdentifierInfo *II = NewTD->getIdentifier()) 3570 if (!NewTD->isInvalidDecl() && 3571 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3572 if (II->isStr("FILE")) 3573 Context.setFILEDecl(NewTD); 3574 else if (II->isStr("jmp_buf")) 3575 Context.setjmp_bufDecl(NewTD); 3576 else if (II->isStr("sigjmp_buf")) 3577 Context.setsigjmp_bufDecl(NewTD); 3578 else if (II->isStr("__builtin_va_list")) 3579 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3580 } 3581 3582 return NewTD; 3583} 3584 3585/// \brief Determines whether the given declaration is an out-of-scope 3586/// previous declaration. 3587/// 3588/// This routine should be invoked when name lookup has found a 3589/// previous declaration (PrevDecl) that is not in the scope where a 3590/// new declaration by the same name is being introduced. If the new 3591/// declaration occurs in a local scope, previous declarations with 3592/// linkage may still be considered previous declarations (C99 3593/// 6.2.2p4-5, C++ [basic.link]p6). 3594/// 3595/// \param PrevDecl the previous declaration found by name 3596/// lookup 3597/// 3598/// \param DC the context in which the new declaration is being 3599/// declared. 3600/// 3601/// \returns true if PrevDecl is an out-of-scope previous declaration 3602/// for a new delcaration with the same name. 3603static bool 3604isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3605 ASTContext &Context) { 3606 if (!PrevDecl) 3607 return false; 3608 3609 if (!PrevDecl->hasLinkage()) 3610 return false; 3611 3612 if (Context.getLangOptions().CPlusPlus) { 3613 // C++ [basic.link]p6: 3614 // If there is a visible declaration of an entity with linkage 3615 // having the same name and type, ignoring entities declared 3616 // outside the innermost enclosing namespace scope, the block 3617 // scope declaration declares that same entity and receives the 3618 // linkage of the previous declaration. 3619 DeclContext *OuterContext = DC->getRedeclContext(); 3620 if (!OuterContext->isFunctionOrMethod()) 3621 // This rule only applies to block-scope declarations. 3622 return false; 3623 3624 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3625 if (PrevOuterContext->isRecord()) 3626 // We found a member function: ignore it. 3627 return false; 3628 3629 // Find the innermost enclosing namespace for the new and 3630 // previous declarations. 3631 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3632 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3633 3634 // The previous declaration is in a different namespace, so it 3635 // isn't the same function. 3636 if (!OuterContext->Equals(PrevOuterContext)) 3637 return false; 3638 } 3639 3640 return true; 3641} 3642 3643static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3644 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3645 if (!SS.isSet()) return; 3646 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3647} 3648 3649bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3650 QualType type = decl->getType(); 3651 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3652 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3653 // Various kinds of declaration aren't allowed to be __autoreleasing. 3654 unsigned kind = -1U; 3655 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3656 if (var->hasAttr<BlocksAttr>()) 3657 kind = 0; // __block 3658 else if (!var->hasLocalStorage()) 3659 kind = 1; // global 3660 } else if (isa<ObjCIvarDecl>(decl)) { 3661 kind = 3; // ivar 3662 } else if (isa<FieldDecl>(decl)) { 3663 kind = 2; // field 3664 } 3665 3666 if (kind != -1U) { 3667 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3668 << kind; 3669 } 3670 } else if (lifetime == Qualifiers::OCL_None) { 3671 // Try to infer lifetime. 3672 if (!type->isObjCLifetimeType()) 3673 return false; 3674 3675 lifetime = type->getObjCARCImplicitLifetime(); 3676 type = Context.getLifetimeQualifiedType(type, lifetime); 3677 decl->setType(type); 3678 } 3679 3680 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3681 // Thread-local variables cannot have lifetime. 3682 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3683 var->isThreadSpecified()) { 3684 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3685 << var->getType(); 3686 return true; 3687 } 3688 } 3689 3690 return false; 3691} 3692 3693NamedDecl* 3694Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3695 QualType R, TypeSourceInfo *TInfo, 3696 LookupResult &Previous, 3697 MultiTemplateParamsArg TemplateParamLists, 3698 bool &Redeclaration) { 3699 DeclarationName Name = GetNameForDeclarator(D).getName(); 3700 3701 // Check that there are no default arguments (C++ only). 3702 if (getLangOptions().CPlusPlus) 3703 CheckExtraCXXDefaultArguments(D); 3704 3705 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3706 assert(SCSpec != DeclSpec::SCS_typedef && 3707 "Parser allowed 'typedef' as storage class VarDecl."); 3708 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3709 if (SCSpec == DeclSpec::SCS_mutable) { 3710 // mutable can only appear on non-static class members, so it's always 3711 // an error here 3712 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3713 D.setInvalidType(); 3714 SC = SC_None; 3715 } 3716 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3717 VarDecl::StorageClass SCAsWritten 3718 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3719 3720 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3721 if (!II) { 3722 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3723 << Name; 3724 return 0; 3725 } 3726 3727 DiagnoseFunctionSpecifiers(D); 3728 3729 if (!DC->isRecord() && S->getFnParent() == 0) { 3730 // C99 6.9p2: The storage-class specifiers auto and register shall not 3731 // appear in the declaration specifiers in an external declaration. 3732 if (SC == SC_Auto || SC == SC_Register) { 3733 3734 // If this is a register variable with an asm label specified, then this 3735 // is a GNU extension. 3736 if (SC == SC_Register && D.getAsmLabel()) 3737 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3738 else 3739 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3740 D.setInvalidType(); 3741 } 3742 } 3743 3744 if (getLangOptions().OpenCL) { 3745 // Set up the special work-group-local storage class for variables in the 3746 // OpenCL __local address space. 3747 if (R.getAddressSpace() == LangAS::opencl_local) 3748 SC = SC_OpenCLWorkGroupLocal; 3749 } 3750 3751 bool isExplicitSpecialization = false; 3752 VarDecl *NewVD; 3753 if (!getLangOptions().CPlusPlus) { 3754 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3755 D.getIdentifierLoc(), II, 3756 R, TInfo, SC, SCAsWritten); 3757 3758 if (D.isInvalidType()) 3759 NewVD->setInvalidDecl(); 3760 } else { 3761 if (DC->isRecord() && !CurContext->isRecord()) { 3762 // This is an out-of-line definition of a static data member. 3763 if (SC == SC_Static) { 3764 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3765 diag::err_static_out_of_line) 3766 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3767 } else if (SC == SC_None) 3768 SC = SC_Static; 3769 } 3770 if (SC == SC_Static) { 3771 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3772 if (RD->isLocalClass()) 3773 Diag(D.getIdentifierLoc(), 3774 diag::err_static_data_member_not_allowed_in_local_class) 3775 << Name << RD->getDeclName(); 3776 3777 // C++ [class.union]p1: If a union contains a static data member, 3778 // the program is ill-formed. 3779 // 3780 // We also disallow static data members in anonymous structs. 3781 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3782 Diag(D.getIdentifierLoc(), 3783 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3784 << Name << RD->isUnion(); 3785 } 3786 } 3787 3788 // Match up the template parameter lists with the scope specifier, then 3789 // determine whether we have a template or a template specialization. 3790 isExplicitSpecialization = false; 3791 bool Invalid = false; 3792 if (TemplateParameterList *TemplateParams 3793 = MatchTemplateParametersToScopeSpecifier( 3794 D.getDeclSpec().getSourceRange().getBegin(), 3795 D.getIdentifierLoc(), 3796 D.getCXXScopeSpec(), 3797 TemplateParamLists.get(), 3798 TemplateParamLists.size(), 3799 /*never a friend*/ false, 3800 isExplicitSpecialization, 3801 Invalid)) { 3802 if (TemplateParams->size() > 0) { 3803 // There is no such thing as a variable template. 3804 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3805 << II 3806 << SourceRange(TemplateParams->getTemplateLoc(), 3807 TemplateParams->getRAngleLoc()); 3808 return 0; 3809 } else { 3810 // There is an extraneous 'template<>' for this variable. Complain 3811 // about it, but allow the declaration of the variable. 3812 Diag(TemplateParams->getTemplateLoc(), 3813 diag::err_template_variable_noparams) 3814 << II 3815 << SourceRange(TemplateParams->getTemplateLoc(), 3816 TemplateParams->getRAngleLoc()); 3817 } 3818 } 3819 3820 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3821 D.getIdentifierLoc(), II, 3822 R, TInfo, SC, SCAsWritten); 3823 3824 // If this decl has an auto type in need of deduction, make a note of the 3825 // Decl so we can diagnose uses of it in its own initializer. 3826 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3827 R->getContainedAutoType()) 3828 ParsingInitForAutoVars.insert(NewVD); 3829 3830 if (D.isInvalidType() || Invalid) 3831 NewVD->setInvalidDecl(); 3832 3833 SetNestedNameSpecifier(NewVD, D); 3834 3835 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3836 NewVD->setTemplateParameterListsInfo(Context, 3837 TemplateParamLists.size(), 3838 TemplateParamLists.release()); 3839 } 3840 3841 if (D.getDeclSpec().isConstexprSpecified()) { 3842 // FIXME: once we know whether there's an initializer, apply this to 3843 // static data members too. 3844 if (!NewVD->isStaticDataMember() && 3845 !NewVD->isThisDeclarationADefinition()) { 3846 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3847 // of a variable. Suggest replacing it with 'const' if appropriate. 3848 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3849 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3850 // If the declarator is complex, we need to move the keyword to the 3851 // innermost chunk as we switch it from 'constexpr' to 'const'. 3852 int Kind = DeclaratorChunk::Paren; 3853 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3854 Kind = D.getTypeObject(I).Kind; 3855 if (Kind != DeclaratorChunk::Paren) 3856 break; 3857 } 3858 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3859 Kind == DeclaratorChunk::Reference) 3860 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3861 << FixItHint::CreateRemoval(ConstexprRange); 3862 else if (Kind == DeclaratorChunk::Paren) 3863 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3864 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3865 else 3866 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3867 << FixItHint::CreateRemoval(ConstexprRange) 3868 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3869 } else { 3870 NewVD->setConstexpr(true); 3871 } 3872 } 3873 } 3874 3875 // Set the lexical context. If the declarator has a C++ scope specifier, the 3876 // lexical context will be different from the semantic context. 3877 NewVD->setLexicalDeclContext(CurContext); 3878 3879 if (D.getDeclSpec().isThreadSpecified()) { 3880 if (NewVD->hasLocalStorage()) 3881 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3882 else if (!Context.getTargetInfo().isTLSSupported()) 3883 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3884 else 3885 NewVD->setThreadSpecified(true); 3886 } 3887 3888 if (D.getDeclSpec().isModulePrivateSpecified()) { 3889 if (isExplicitSpecialization) 3890 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3891 << 2 3892 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3893 else if (NewVD->hasLocalStorage()) 3894 Diag(NewVD->getLocation(), diag::err_module_private_local) 3895 << 0 << NewVD->getDeclName() 3896 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3897 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3898 else 3899 NewVD->setModulePrivate(); 3900 } 3901 3902 // Handle attributes prior to checking for duplicates in MergeVarDecl 3903 ProcessDeclAttributes(S, NewVD, D); 3904 3905 // In auto-retain/release, infer strong retension for variables of 3906 // retainable type. 3907 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3908 NewVD->setInvalidDecl(); 3909 3910 // Handle GNU asm-label extension (encoded as an attribute). 3911 if (Expr *E = (Expr*)D.getAsmLabel()) { 3912 // The parser guarantees this is a string. 3913 StringLiteral *SE = cast<StringLiteral>(E); 3914 StringRef Label = SE->getString(); 3915 if (S->getFnParent() != 0) { 3916 switch (SC) { 3917 case SC_None: 3918 case SC_Auto: 3919 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3920 break; 3921 case SC_Register: 3922 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3923 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3924 break; 3925 case SC_Static: 3926 case SC_Extern: 3927 case SC_PrivateExtern: 3928 case SC_OpenCLWorkGroupLocal: 3929 break; 3930 } 3931 } 3932 3933 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3934 Context, Label)); 3935 } 3936 3937 // Diagnose shadowed variables before filtering for scope. 3938 if (!D.getCXXScopeSpec().isSet()) 3939 CheckShadow(S, NewVD, Previous); 3940 3941 // Don't consider existing declarations that are in a different 3942 // scope and are out-of-semantic-context declarations (if the new 3943 // declaration has linkage). 3944 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3945 isExplicitSpecialization); 3946 3947 if (!getLangOptions().CPlusPlus) 3948 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3949 else { 3950 // Merge the decl with the existing one if appropriate. 3951 if (!Previous.empty()) { 3952 if (Previous.isSingleResult() && 3953 isa<FieldDecl>(Previous.getFoundDecl()) && 3954 D.getCXXScopeSpec().isSet()) { 3955 // The user tried to define a non-static data member 3956 // out-of-line (C++ [dcl.meaning]p1). 3957 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3958 << D.getCXXScopeSpec().getRange(); 3959 Previous.clear(); 3960 NewVD->setInvalidDecl(); 3961 } 3962 } else if (D.getCXXScopeSpec().isSet()) { 3963 // No previous declaration in the qualifying scope. 3964 Diag(D.getIdentifierLoc(), diag::err_no_member) 3965 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3966 << D.getCXXScopeSpec().getRange(); 3967 NewVD->setInvalidDecl(); 3968 } 3969 3970 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3971 3972 // This is an explicit specialization of a static data member. Check it. 3973 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3974 CheckMemberSpecialization(NewVD, Previous)) 3975 NewVD->setInvalidDecl(); 3976 } 3977 3978 // attributes declared post-definition are currently ignored 3979 // FIXME: This should be handled in attribute merging, not 3980 // here. 3981 if (Previous.isSingleResult()) { 3982 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3983 if (Def && (Def = Def->getDefinition()) && 3984 Def != NewVD && D.hasAttributes()) { 3985 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3986 Diag(Def->getLocation(), diag::note_previous_definition); 3987 } 3988 } 3989 3990 // If this is a locally-scoped extern C variable, update the map of 3991 // such variables. 3992 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3993 !NewVD->isInvalidDecl()) 3994 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3995 3996 // If there's a #pragma GCC visibility in scope, and this isn't a class 3997 // member, set the visibility of this variable. 3998 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3999 AddPushedVisibilityAttribute(NewVD); 4000 4001 MarkUnusedFileScopedDecl(NewVD); 4002 4003 return NewVD; 4004} 4005 4006/// \brief Diagnose variable or built-in function shadowing. Implements 4007/// -Wshadow. 4008/// 4009/// This method is called whenever a VarDecl is added to a "useful" 4010/// scope. 4011/// 4012/// \param S the scope in which the shadowing name is being declared 4013/// \param R the lookup of the name 4014/// 4015void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4016 // Return if warning is ignored. 4017 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4018 DiagnosticsEngine::Ignored) 4019 return; 4020 4021 // Don't diagnose declarations at file scope. 4022 if (D->hasGlobalStorage()) 4023 return; 4024 4025 DeclContext *NewDC = D->getDeclContext(); 4026 4027 // Only diagnose if we're shadowing an unambiguous field or variable. 4028 if (R.getResultKind() != LookupResult::Found) 4029 return; 4030 4031 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4032 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4033 return; 4034 4035 // Fields are not shadowed by variables in C++ static methods. 4036 if (isa<FieldDecl>(ShadowedDecl)) 4037 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4038 if (MD->isStatic()) 4039 return; 4040 4041 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4042 if (shadowedVar->isExternC()) { 4043 // For shadowing external vars, make sure that we point to the global 4044 // declaration, not a locally scoped extern declaration. 4045 for (VarDecl::redecl_iterator 4046 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4047 I != E; ++I) 4048 if (I->isFileVarDecl()) { 4049 ShadowedDecl = *I; 4050 break; 4051 } 4052 } 4053 4054 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4055 4056 // Only warn about certain kinds of shadowing for class members. 4057 if (NewDC && NewDC->isRecord()) { 4058 // In particular, don't warn about shadowing non-class members. 4059 if (!OldDC->isRecord()) 4060 return; 4061 4062 // TODO: should we warn about static data members shadowing 4063 // static data members from base classes? 4064 4065 // TODO: don't diagnose for inaccessible shadowed members. 4066 // This is hard to do perfectly because we might friend the 4067 // shadowing context, but that's just a false negative. 4068 } 4069 4070 // Determine what kind of declaration we're shadowing. 4071 unsigned Kind; 4072 if (isa<RecordDecl>(OldDC)) { 4073 if (isa<FieldDecl>(ShadowedDecl)) 4074 Kind = 3; // field 4075 else 4076 Kind = 2; // static data member 4077 } else if (OldDC->isFileContext()) 4078 Kind = 1; // global 4079 else 4080 Kind = 0; // local 4081 4082 DeclarationName Name = R.getLookupName(); 4083 4084 // Emit warning and note. 4085 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4086 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4087} 4088 4089/// \brief Check -Wshadow without the advantage of a previous lookup. 4090void Sema::CheckShadow(Scope *S, VarDecl *D) { 4091 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4092 DiagnosticsEngine::Ignored) 4093 return; 4094 4095 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4096 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4097 LookupName(R, S); 4098 CheckShadow(S, D, R); 4099} 4100 4101/// \brief Perform semantic checking on a newly-created variable 4102/// declaration. 4103/// 4104/// This routine performs all of the type-checking required for a 4105/// variable declaration once it has been built. It is used both to 4106/// check variables after they have been parsed and their declarators 4107/// have been translated into a declaration, and to check variables 4108/// that have been instantiated from a template. 4109/// 4110/// Sets NewVD->isInvalidDecl() if an error was encountered. 4111void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4112 LookupResult &Previous, 4113 bool &Redeclaration) { 4114 // If the decl is already known invalid, don't check it. 4115 if (NewVD->isInvalidDecl()) 4116 return; 4117 4118 QualType T = NewVD->getType(); 4119 4120 if (T->isObjCObjectType()) { 4121 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4122 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4123 T = Context.getObjCObjectPointerType(T); 4124 NewVD->setType(T); 4125 } 4126 4127 // Emit an error if an address space was applied to decl with local storage. 4128 // This includes arrays of objects with address space qualifiers, but not 4129 // automatic variables that point to other address spaces. 4130 // ISO/IEC TR 18037 S5.1.2 4131 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4132 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4133 return NewVD->setInvalidDecl(); 4134 } 4135 4136 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4137 && !NewVD->hasAttr<BlocksAttr>()) { 4138 if (getLangOptions().getGC() != LangOptions::NonGC) 4139 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4140 else 4141 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4142 } 4143 4144 bool isVM = T->isVariablyModifiedType(); 4145 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4146 NewVD->hasAttr<BlocksAttr>()) 4147 getCurFunction()->setHasBranchProtectedScope(); 4148 4149 if ((isVM && NewVD->hasLinkage()) || 4150 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4151 bool SizeIsNegative; 4152 llvm::APSInt Oversized; 4153 QualType FixedTy = 4154 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4155 Oversized); 4156 4157 if (FixedTy.isNull() && T->isVariableArrayType()) { 4158 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4159 // FIXME: This won't give the correct result for 4160 // int a[10][n]; 4161 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4162 4163 if (NewVD->isFileVarDecl()) 4164 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4165 << SizeRange; 4166 else if (NewVD->getStorageClass() == SC_Static) 4167 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4168 << SizeRange; 4169 else 4170 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4171 << SizeRange; 4172 return NewVD->setInvalidDecl(); 4173 } 4174 4175 if (FixedTy.isNull()) { 4176 if (NewVD->isFileVarDecl()) 4177 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4178 else 4179 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4180 return NewVD->setInvalidDecl(); 4181 } 4182 4183 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4184 NewVD->setType(FixedTy); 4185 } 4186 4187 if (Previous.empty() && NewVD->isExternC()) { 4188 // Since we did not find anything by this name and we're declaring 4189 // an extern "C" variable, look for a non-visible extern "C" 4190 // declaration with the same name. 4191 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4192 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4193 if (Pos != LocallyScopedExternalDecls.end()) 4194 Previous.addDecl(Pos->second); 4195 } 4196 4197 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4198 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4199 << T; 4200 return NewVD->setInvalidDecl(); 4201 } 4202 4203 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4204 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4205 return NewVD->setInvalidDecl(); 4206 } 4207 4208 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4209 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4210 return NewVD->setInvalidDecl(); 4211 } 4212 4213 // Function pointers and references cannot have qualified function type, only 4214 // function pointer-to-members can do that. 4215 QualType Pointee; 4216 unsigned PtrOrRef = 0; 4217 if (const PointerType *Ptr = T->getAs<PointerType>()) 4218 Pointee = Ptr->getPointeeType(); 4219 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4220 Pointee = Ref->getPointeeType(); 4221 PtrOrRef = 1; 4222 } 4223 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4224 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4225 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4226 << PtrOrRef; 4227 return NewVD->setInvalidDecl(); 4228 } 4229 4230 if (!Previous.empty()) { 4231 Redeclaration = true; 4232 MergeVarDecl(NewVD, Previous); 4233 } 4234} 4235 4236/// \brief Data used with FindOverriddenMethod 4237struct FindOverriddenMethodData { 4238 Sema *S; 4239 CXXMethodDecl *Method; 4240}; 4241 4242/// \brief Member lookup function that determines whether a given C++ 4243/// method overrides a method in a base class, to be used with 4244/// CXXRecordDecl::lookupInBases(). 4245static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4246 CXXBasePath &Path, 4247 void *UserData) { 4248 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4249 4250 FindOverriddenMethodData *Data 4251 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4252 4253 DeclarationName Name = Data->Method->getDeclName(); 4254 4255 // FIXME: Do we care about other names here too? 4256 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4257 // We really want to find the base class destructor here. 4258 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4259 CanQualType CT = Data->S->Context.getCanonicalType(T); 4260 4261 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4262 } 4263 4264 for (Path.Decls = BaseRecord->lookup(Name); 4265 Path.Decls.first != Path.Decls.second; 4266 ++Path.Decls.first) { 4267 NamedDecl *D = *Path.Decls.first; 4268 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4269 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4270 return true; 4271 } 4272 } 4273 4274 return false; 4275} 4276 4277/// AddOverriddenMethods - See if a method overrides any in the base classes, 4278/// and if so, check that it's a valid override and remember it. 4279bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4280 // Look for virtual methods in base classes that this method might override. 4281 CXXBasePaths Paths; 4282 FindOverriddenMethodData Data; 4283 Data.Method = MD; 4284 Data.S = this; 4285 bool AddedAny = false; 4286 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4287 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4288 E = Paths.found_decls_end(); I != E; ++I) { 4289 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4290 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4291 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4292 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4293 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4294 AddedAny = true; 4295 } 4296 } 4297 } 4298 } 4299 4300 return AddedAny; 4301} 4302 4303static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4304 bool isFriendDecl) { 4305 DeclarationName Name = NewFD->getDeclName(); 4306 DeclContext *DC = NewFD->getDeclContext(); 4307 LookupResult Prev(S, Name, NewFD->getLocation(), 4308 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4309 llvm::SmallVector<unsigned, 1> MismatchedParams; 4310 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4311 TypoCorrection Correction; 4312 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4313 : diag::err_member_def_does_not_match; 4314 4315 NewFD->setInvalidDecl(); 4316 S.LookupQualifiedName(Prev, DC); 4317 assert(!Prev.isAmbiguous() && 4318 "Cannot have an ambiguity in previous-declaration lookup"); 4319 if (!Prev.empty()) { 4320 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4321 Func != FuncEnd; ++Func) { 4322 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4323 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4324 MismatchedParams)) { 4325 // Add 1 to the index so that 0 can mean the mismatch didn't 4326 // involve a parameter 4327 unsigned ParamNum = 4328 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4329 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4330 } 4331 } 4332 // If the qualified name lookup yielded nothing, try typo correction 4333 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4334 Prev.getLookupKind(), 0, 0, DC)) && 4335 Correction.getCorrection() != Name) { 4336 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4337 CDeclEnd = Correction.end(); 4338 CDecl != CDeclEnd; ++CDecl) { 4339 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4340 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4341 MismatchedParams)) { 4342 // Add 1 to the index so that 0 can mean the mismatch didn't 4343 // involve a parameter 4344 unsigned ParamNum = 4345 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4346 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4347 } 4348 } 4349 if (!NearMatches.empty()) 4350 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4351 : diag::err_member_def_does_not_match_suggest; 4352 } 4353 4354 // Ignore the correction if it didn't yield any close FunctionDecl matches 4355 if (Correction && NearMatches.empty()) 4356 Correction = TypoCorrection(); 4357 4358 if (Correction) 4359 S.Diag(NewFD->getLocation(), DiagMsg) 4360 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4361 << FixItHint::CreateReplacement( 4362 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4363 else 4364 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4365 4366 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4367 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4368 NearMatch != NearMatchEnd; ++NearMatch) { 4369 FunctionDecl *FD = NearMatch->first; 4370 4371 if (unsigned Idx = NearMatch->second) { 4372 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4373 S.Diag(FDParam->getTypeSpecStartLoc(), 4374 diag::note_member_def_close_param_match) 4375 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4376 } else if (Correction) { 4377 S.Diag(FD->getLocation(), diag::note_previous_decl) 4378 << Correction.getQuoted(S.getLangOptions()); 4379 } else 4380 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4381 } 4382} 4383 4384NamedDecl* 4385Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4386 QualType R, TypeSourceInfo *TInfo, 4387 LookupResult &Previous, 4388 MultiTemplateParamsArg TemplateParamLists, 4389 bool IsFunctionDefinition, bool &Redeclaration, 4390 bool &AddToScope) { 4391 assert(R.getTypePtr()->isFunctionType()); 4392 4393 // TODO: consider using NameInfo for diagnostic. 4394 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4395 DeclarationName Name = NameInfo.getName(); 4396 FunctionDecl::StorageClass SC = SC_None; 4397 switch (D.getDeclSpec().getStorageClassSpec()) { 4398 default: llvm_unreachable("Unknown storage class!"); 4399 case DeclSpec::SCS_auto: 4400 case DeclSpec::SCS_register: 4401 case DeclSpec::SCS_mutable: 4402 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4403 diag::err_typecheck_sclass_func); 4404 D.setInvalidType(); 4405 break; 4406 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4407 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4408 case DeclSpec::SCS_static: { 4409 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4410 // C99 6.7.1p5: 4411 // The declaration of an identifier for a function that has 4412 // block scope shall have no explicit storage-class specifier 4413 // other than extern 4414 // See also (C++ [dcl.stc]p4). 4415 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4416 diag::err_static_block_func); 4417 SC = SC_None; 4418 } else 4419 SC = SC_Static; 4420 break; 4421 } 4422 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4423 } 4424 4425 if (D.getDeclSpec().isThreadSpecified()) 4426 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4427 4428 // Do not allow returning a objc interface by-value. 4429 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4430 Diag(D.getIdentifierLoc(), 4431 diag::err_object_cannot_be_passed_returned_by_value) << 0 4432 << R->getAs<FunctionType>()->getResultType() 4433 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4434 4435 QualType T = R->getAs<FunctionType>()->getResultType(); 4436 T = Context.getObjCObjectPointerType(T); 4437 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4438 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4439 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4440 FPT->getNumArgs(), EPI); 4441 } 4442 else if (isa<FunctionNoProtoType>(R)) 4443 R = Context.getFunctionNoProtoType(T); 4444 } 4445 4446 FunctionDecl *NewFD; 4447 bool isInline = D.getDeclSpec().isInlineSpecified(); 4448 bool isFriend = false; 4449 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4450 FunctionDecl::StorageClass SCAsWritten 4451 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4452 FunctionTemplateDecl *FunctionTemplate = 0; 4453 bool isExplicitSpecialization = false; 4454 bool isFunctionTemplateSpecialization = false; 4455 bool isDependentClassScopeExplicitSpecialization = false; 4456 4457 if (!getLangOptions().CPlusPlus) { 4458 // Determine whether the function was written with a 4459 // prototype. This true when: 4460 // - there is a prototype in the declarator, or 4461 // - the type R of the function is some kind of typedef or other reference 4462 // to a type name (which eventually refers to a function type). 4463 bool HasPrototype = 4464 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4465 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4466 4467 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4468 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4469 HasPrototype); 4470 if (D.isInvalidType()) 4471 NewFD->setInvalidDecl(); 4472 4473 // Set the lexical context. 4474 NewFD->setLexicalDeclContext(CurContext); 4475 // Filter out previous declarations that don't match the scope. 4476 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4477 /*ExplicitInstantiationOrSpecialization=*/false); 4478 } else { 4479 isFriend = D.getDeclSpec().isFriendSpecified(); 4480 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4481 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4482 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4483 bool isVirtualOkay = false; 4484 4485 // Check that the return type is not an abstract class type. 4486 // For record types, this is done by the AbstractClassUsageDiagnoser once 4487 // the class has been completely parsed. 4488 if (!DC->isRecord() && 4489 RequireNonAbstractType(D.getIdentifierLoc(), 4490 R->getAs<FunctionType>()->getResultType(), 4491 diag::err_abstract_type_in_decl, 4492 AbstractReturnType)) 4493 D.setInvalidType(); 4494 4495 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4496 // This is a C++ constructor declaration. 4497 assert(DC->isRecord() && 4498 "Constructors can only be declared in a member context"); 4499 4500 R = CheckConstructorDeclarator(D, R, SC); 4501 4502 // Create the new declaration 4503 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4504 Context, 4505 cast<CXXRecordDecl>(DC), 4506 D.getSourceRange().getBegin(), 4507 NameInfo, R, TInfo, 4508 isExplicit, isInline, 4509 /*isImplicitlyDeclared=*/false, 4510 isConstexpr); 4511 4512 NewFD = NewCD; 4513 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4514 // This is a C++ destructor declaration. 4515 if (DC->isRecord()) { 4516 R = CheckDestructorDeclarator(D, R, SC); 4517 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4518 4519 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4520 D.getSourceRange().getBegin(), 4521 NameInfo, R, TInfo, 4522 isInline, 4523 /*isImplicitlyDeclared=*/false); 4524 NewFD = NewDD; 4525 isVirtualOkay = true; 4526 4527 // If the class is complete, then we now create the implicit exception 4528 // specification. If the class is incomplete or dependent, we can't do 4529 // it yet. 4530 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4531 Record->getDefinition() && !Record->isBeingDefined() && 4532 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4533 AdjustDestructorExceptionSpec(Record, NewDD); 4534 } 4535 4536 } else { 4537 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4538 4539 // Create a FunctionDecl to satisfy the function definition parsing 4540 // code path. 4541 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4542 D.getIdentifierLoc(), Name, R, TInfo, 4543 SC, SCAsWritten, isInline, 4544 /*hasPrototype=*/true, isConstexpr); 4545 D.setInvalidType(); 4546 } 4547 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4548 if (!DC->isRecord()) { 4549 Diag(D.getIdentifierLoc(), 4550 diag::err_conv_function_not_member); 4551 return 0; 4552 } 4553 4554 CheckConversionDeclarator(D, R, SC); 4555 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4556 D.getSourceRange().getBegin(), 4557 NameInfo, R, TInfo, 4558 isInline, isExplicit, isConstexpr, 4559 SourceLocation()); 4560 4561 isVirtualOkay = true; 4562 } else if (DC->isRecord()) { 4563 // If the name of the function is the same as the name of the record, 4564 // then this must be an invalid constructor that has a return type. 4565 // (The parser checks for a return type and makes the declarator a 4566 // constructor if it has no return type). 4567 if (Name.getAsIdentifierInfo() && 4568 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4569 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4570 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4571 << SourceRange(D.getIdentifierLoc()); 4572 return 0; 4573 } 4574 4575 bool isStatic = SC == SC_Static; 4576 4577 // [class.free]p1: 4578 // Any allocation function for a class T is a static member 4579 // (even if not explicitly declared static). 4580 if (Name.getCXXOverloadedOperator() == OO_New || 4581 Name.getCXXOverloadedOperator() == OO_Array_New) 4582 isStatic = true; 4583 4584 // [class.free]p6 Any deallocation function for a class X is a static member 4585 // (even if not explicitly declared static). 4586 if (Name.getCXXOverloadedOperator() == OO_Delete || 4587 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4588 isStatic = true; 4589 4590 // This is a C++ method declaration. 4591 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4592 Context, cast<CXXRecordDecl>(DC), 4593 D.getSourceRange().getBegin(), 4594 NameInfo, R, TInfo, 4595 isStatic, SCAsWritten, isInline, 4596 isConstexpr, 4597 SourceLocation()); 4598 NewFD = NewMD; 4599 4600 isVirtualOkay = !isStatic; 4601 } else { 4602 // Determine whether the function was written with a 4603 // prototype. This true when: 4604 // - we're in C++ (where every function has a prototype), 4605 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4606 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4607 true/*HasPrototype*/, isConstexpr); 4608 } 4609 4610 if (isFriend && !isInline && IsFunctionDefinition) { 4611 // C++ [class.friend]p5 4612 // A function can be defined in a friend declaration of a 4613 // class . . . . Such a function is implicitly inline. 4614 NewFD->setImplicitlyInline(); 4615 } 4616 4617 SetNestedNameSpecifier(NewFD, D); 4618 isExplicitSpecialization = false; 4619 isFunctionTemplateSpecialization = false; 4620 if (D.isInvalidType()) 4621 NewFD->setInvalidDecl(); 4622 4623 // Set the lexical context. If the declarator has a C++ 4624 // scope specifier, or is the object of a friend declaration, the 4625 // lexical context will be different from the semantic context. 4626 NewFD->setLexicalDeclContext(CurContext); 4627 4628 // Match up the template parameter lists with the scope specifier, then 4629 // determine whether we have a template or a template specialization. 4630 bool Invalid = false; 4631 if (TemplateParameterList *TemplateParams 4632 = MatchTemplateParametersToScopeSpecifier( 4633 D.getDeclSpec().getSourceRange().getBegin(), 4634 D.getIdentifierLoc(), 4635 D.getCXXScopeSpec(), 4636 TemplateParamLists.get(), 4637 TemplateParamLists.size(), 4638 isFriend, 4639 isExplicitSpecialization, 4640 Invalid)) { 4641 if (TemplateParams->size() > 0) { 4642 // This is a function template 4643 4644 // Check that we can declare a template here. 4645 if (CheckTemplateDeclScope(S, TemplateParams)) 4646 return 0; 4647 4648 // A destructor cannot be a template. 4649 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4650 Diag(NewFD->getLocation(), diag::err_destructor_template); 4651 return 0; 4652 } 4653 4654 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4655 NewFD->getLocation(), 4656 Name, TemplateParams, 4657 NewFD); 4658 FunctionTemplate->setLexicalDeclContext(CurContext); 4659 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4660 4661 // For source fidelity, store the other template param lists. 4662 if (TemplateParamLists.size() > 1) { 4663 NewFD->setTemplateParameterListsInfo(Context, 4664 TemplateParamLists.size() - 1, 4665 TemplateParamLists.release()); 4666 } 4667 } else { 4668 // This is a function template specialization. 4669 isFunctionTemplateSpecialization = true; 4670 // For source fidelity, store all the template param lists. 4671 NewFD->setTemplateParameterListsInfo(Context, 4672 TemplateParamLists.size(), 4673 TemplateParamLists.release()); 4674 4675 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4676 if (isFriend) { 4677 // We want to remove the "template<>", found here. 4678 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4679 4680 // If we remove the template<> and the name is not a 4681 // template-id, we're actually silently creating a problem: 4682 // the friend declaration will refer to an untemplated decl, 4683 // and clearly the user wants a template specialization. So 4684 // we need to insert '<>' after the name. 4685 SourceLocation InsertLoc; 4686 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4687 InsertLoc = D.getName().getSourceRange().getEnd(); 4688 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4689 } 4690 4691 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4692 << Name << RemoveRange 4693 << FixItHint::CreateRemoval(RemoveRange) 4694 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4695 } 4696 } 4697 } 4698 else { 4699 // All template param lists were matched against the scope specifier: 4700 // this is NOT (an explicit specialization of) a template. 4701 if (TemplateParamLists.size() > 0) 4702 // For source fidelity, store all the template param lists. 4703 NewFD->setTemplateParameterListsInfo(Context, 4704 TemplateParamLists.size(), 4705 TemplateParamLists.release()); 4706 } 4707 4708 if (Invalid) { 4709 NewFD->setInvalidDecl(); 4710 if (FunctionTemplate) 4711 FunctionTemplate->setInvalidDecl(); 4712 } 4713 4714 // C++ [dcl.fct.spec]p5: 4715 // The virtual specifier shall only be used in declarations of 4716 // nonstatic class member functions that appear within a 4717 // member-specification of a class declaration; see 10.3. 4718 // 4719 if (isVirtual && !NewFD->isInvalidDecl()) { 4720 if (!isVirtualOkay) { 4721 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4722 diag::err_virtual_non_function); 4723 } else if (!CurContext->isRecord()) { 4724 // 'virtual' was specified outside of the class. 4725 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4726 diag::err_virtual_out_of_class) 4727 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4728 } else if (NewFD->getDescribedFunctionTemplate()) { 4729 // C++ [temp.mem]p3: 4730 // A member function template shall not be virtual. 4731 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4732 diag::err_virtual_member_function_template) 4733 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4734 } else { 4735 // Okay: Add virtual to the method. 4736 NewFD->setVirtualAsWritten(true); 4737 } 4738 } 4739 4740 // C++ [dcl.fct.spec]p3: 4741 // The inline specifier shall not appear on a block scope function declaration. 4742 if (isInline && !NewFD->isInvalidDecl()) { 4743 if (CurContext->isFunctionOrMethod()) { 4744 // 'inline' is not allowed on block scope function declaration. 4745 Diag(D.getDeclSpec().getInlineSpecLoc(), 4746 diag::err_inline_declaration_block_scope) << Name 4747 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4748 } 4749 } 4750 4751 // C++ [dcl.fct.spec]p6: 4752 // The explicit specifier shall be used only in the declaration of a 4753 // constructor or conversion function within its class definition; see 12.3.1 4754 // and 12.3.2. 4755 if (isExplicit && !NewFD->isInvalidDecl()) { 4756 if (!CurContext->isRecord()) { 4757 // 'explicit' was specified outside of the class. 4758 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4759 diag::err_explicit_out_of_class) 4760 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4761 } else if (!isa<CXXConstructorDecl>(NewFD) && 4762 !isa<CXXConversionDecl>(NewFD)) { 4763 // 'explicit' was specified on a function that wasn't a constructor 4764 // or conversion function. 4765 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4766 diag::err_explicit_non_ctor_or_conv_function) 4767 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4768 } 4769 } 4770 4771 if (isConstexpr) { 4772 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4773 // are implicitly inline. 4774 NewFD->setImplicitlyInline(); 4775 4776 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4777 // be either constructors or to return a literal type. Therefore, 4778 // destructors cannot be declared constexpr. 4779 if (isa<CXXDestructorDecl>(NewFD)) 4780 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4781 } 4782 4783 // If __module_private__ was specified, mark the function accordingly. 4784 if (D.getDeclSpec().isModulePrivateSpecified()) { 4785 if (isFunctionTemplateSpecialization) { 4786 SourceLocation ModulePrivateLoc 4787 = D.getDeclSpec().getModulePrivateSpecLoc(); 4788 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4789 << 0 4790 << FixItHint::CreateRemoval(ModulePrivateLoc); 4791 } else { 4792 NewFD->setModulePrivate(); 4793 if (FunctionTemplate) 4794 FunctionTemplate->setModulePrivate(); 4795 } 4796 } 4797 4798 // Filter out previous declarations that don't match the scope. 4799 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4800 isExplicitSpecialization || 4801 isFunctionTemplateSpecialization); 4802 4803 if (isFriend) { 4804 // For now, claim that the objects have no previous declaration. 4805 if (FunctionTemplate) { 4806 FunctionTemplate->setObjectOfFriendDecl(false); 4807 FunctionTemplate->setAccess(AS_public); 4808 } 4809 NewFD->setObjectOfFriendDecl(false); 4810 NewFD->setAccess(AS_public); 4811 } 4812 4813 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4814 // A method is implicitly inline if it's defined in its class 4815 // definition. 4816 NewFD->setImplicitlyInline(); 4817 } 4818 4819 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4820 !CurContext->isRecord()) { 4821 // C++ [class.static]p1: 4822 // A data or function member of a class may be declared static 4823 // in a class definition, in which case it is a static member of 4824 // the class. 4825 4826 // Complain about the 'static' specifier if it's on an out-of-line 4827 // member function definition. 4828 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4829 diag::err_static_out_of_line) 4830 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4831 } 4832 } 4833 4834 // Handle GNU asm-label extension (encoded as an attribute). 4835 if (Expr *E = (Expr*) D.getAsmLabel()) { 4836 // The parser guarantees this is a string. 4837 StringLiteral *SE = cast<StringLiteral>(E); 4838 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4839 SE->getString())); 4840 } 4841 4842 // Copy the parameter declarations from the declarator D to the function 4843 // declaration NewFD, if they are available. First scavenge them into Params. 4844 SmallVector<ParmVarDecl*, 16> Params; 4845 if (D.isFunctionDeclarator()) { 4846 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4847 4848 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4849 // function that takes no arguments, not a function that takes a 4850 // single void argument. 4851 // We let through "const void" here because Sema::GetTypeForDeclarator 4852 // already checks for that case. 4853 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4854 FTI.ArgInfo[0].Param && 4855 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4856 // Empty arg list, don't push any params. 4857 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4858 4859 // In C++, the empty parameter-type-list must be spelled "void"; a 4860 // typedef of void is not permitted. 4861 if (getLangOptions().CPlusPlus && 4862 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4863 bool IsTypeAlias = false; 4864 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4865 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4866 else if (const TemplateSpecializationType *TST = 4867 Param->getType()->getAs<TemplateSpecializationType>()) 4868 IsTypeAlias = TST->isTypeAlias(); 4869 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4870 << IsTypeAlias; 4871 } 4872 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4873 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4874 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4875 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4876 Param->setDeclContext(NewFD); 4877 Params.push_back(Param); 4878 4879 if (Param->isInvalidDecl()) 4880 NewFD->setInvalidDecl(); 4881 } 4882 } 4883 4884 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4885 // When we're declaring a function with a typedef, typeof, etc as in the 4886 // following example, we'll need to synthesize (unnamed) 4887 // parameters for use in the declaration. 4888 // 4889 // @code 4890 // typedef void fn(int); 4891 // fn f; 4892 // @endcode 4893 4894 // Synthesize a parameter for each argument type. 4895 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4896 AE = FT->arg_type_end(); AI != AE; ++AI) { 4897 ParmVarDecl *Param = 4898 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4899 Param->setScopeInfo(0, Params.size()); 4900 Params.push_back(Param); 4901 } 4902 } else { 4903 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4904 "Should not need args for typedef of non-prototype fn"); 4905 } 4906 // Finally, we know we have the right number of parameters, install them. 4907 NewFD->setParams(Params); 4908 4909 // Process the non-inheritable attributes on this declaration. 4910 ProcessDeclAttributes(S, NewFD, D, 4911 /*NonInheritable=*/true, /*Inheritable=*/false); 4912 4913 if (!getLangOptions().CPlusPlus) { 4914 // Perform semantic checking on the function declaration. 4915 bool isExplicitSpecialization=false; 4916 if (!NewFD->isInvalidDecl()) { 4917 if (NewFD->getResultType()->isVariablyModifiedType()) { 4918 // Functions returning a variably modified type violate C99 6.7.5.2p2 4919 // because all functions have linkage. 4920 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4921 NewFD->setInvalidDecl(); 4922 } else { 4923 if (NewFD->isMain()) 4924 CheckMain(NewFD, D.getDeclSpec()); 4925 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4926 Redeclaration); 4927 } 4928 } 4929 assert((NewFD->isInvalidDecl() || !Redeclaration || 4930 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4931 "previous declaration set still overloaded"); 4932 } else { 4933 // If the declarator is a template-id, translate the parser's template 4934 // argument list into our AST format. 4935 bool HasExplicitTemplateArgs = false; 4936 TemplateArgumentListInfo TemplateArgs; 4937 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4938 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4939 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4940 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4941 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4942 TemplateId->getTemplateArgs(), 4943 TemplateId->NumArgs); 4944 translateTemplateArguments(TemplateArgsPtr, 4945 TemplateArgs); 4946 TemplateArgsPtr.release(); 4947 4948 HasExplicitTemplateArgs = true; 4949 4950 if (NewFD->isInvalidDecl()) { 4951 HasExplicitTemplateArgs = false; 4952 } else if (FunctionTemplate) { 4953 // Function template with explicit template arguments. 4954 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4955 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4956 4957 HasExplicitTemplateArgs = false; 4958 } else if (!isFunctionTemplateSpecialization && 4959 !D.getDeclSpec().isFriendSpecified()) { 4960 // We have encountered something that the user meant to be a 4961 // specialization (because it has explicitly-specified template 4962 // arguments) but that was not introduced with a "template<>" (or had 4963 // too few of them). 4964 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4965 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4966 << FixItHint::CreateInsertion( 4967 D.getDeclSpec().getSourceRange().getBegin(), 4968 "template<> "); 4969 isFunctionTemplateSpecialization = true; 4970 } else { 4971 // "friend void foo<>(int);" is an implicit specialization decl. 4972 isFunctionTemplateSpecialization = true; 4973 } 4974 } else if (isFriend && isFunctionTemplateSpecialization) { 4975 // This combination is only possible in a recovery case; the user 4976 // wrote something like: 4977 // template <> friend void foo(int); 4978 // which we're recovering from as if the user had written: 4979 // friend void foo<>(int); 4980 // Go ahead and fake up a template id. 4981 HasExplicitTemplateArgs = true; 4982 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4983 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4984 } 4985 4986 // If it's a friend (and only if it's a friend), it's possible 4987 // that either the specialized function type or the specialized 4988 // template is dependent, and therefore matching will fail. In 4989 // this case, don't check the specialization yet. 4990 if (isFunctionTemplateSpecialization && isFriend && 4991 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4992 assert(HasExplicitTemplateArgs && 4993 "friend function specialization without template args"); 4994 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4995 Previous)) 4996 NewFD->setInvalidDecl(); 4997 } else if (isFunctionTemplateSpecialization) { 4998 if (CurContext->isDependentContext() && CurContext->isRecord() 4999 && !isFriend) { 5000 isDependentClassScopeExplicitSpecialization = true; 5001 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5002 diag::ext_function_specialization_in_class : 5003 diag::err_function_specialization_in_class) 5004 << NewFD->getDeclName(); 5005 } else if (CheckFunctionTemplateSpecialization(NewFD, 5006 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5007 Previous)) 5008 NewFD->setInvalidDecl(); 5009 5010 // C++ [dcl.stc]p1: 5011 // A storage-class-specifier shall not be specified in an explicit 5012 // specialization (14.7.3) 5013 if (SC != SC_None) { 5014 if (SC != NewFD->getStorageClass()) 5015 Diag(NewFD->getLocation(), 5016 diag::err_explicit_specialization_inconsistent_storage_class) 5017 << SC 5018 << FixItHint::CreateRemoval( 5019 D.getDeclSpec().getStorageClassSpecLoc()); 5020 5021 else 5022 Diag(NewFD->getLocation(), 5023 diag::ext_explicit_specialization_storage_class) 5024 << FixItHint::CreateRemoval( 5025 D.getDeclSpec().getStorageClassSpecLoc()); 5026 } 5027 5028 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5029 if (CheckMemberSpecialization(NewFD, Previous)) 5030 NewFD->setInvalidDecl(); 5031 } 5032 5033 // Perform semantic checking on the function declaration. 5034 if (!isDependentClassScopeExplicitSpecialization) { 5035 if (NewFD->isInvalidDecl()) { 5036 // If this is a class member, mark the class invalid immediately. 5037 // This avoids some consistency errors later. 5038 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5039 methodDecl->getParent()->setInvalidDecl(); 5040 } else { 5041 if (NewFD->isMain()) 5042 CheckMain(NewFD, D.getDeclSpec()); 5043 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5044 Redeclaration); 5045 } 5046 } 5047 5048 assert((NewFD->isInvalidDecl() || !Redeclaration || 5049 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5050 "previous declaration set still overloaded"); 5051 5052 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5053 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5054 NewFD->setInvalidDecl(); 5055 5056 NamedDecl *PrincipalDecl = (FunctionTemplate 5057 ? cast<NamedDecl>(FunctionTemplate) 5058 : NewFD); 5059 5060 if (isFriend && Redeclaration) { 5061 AccessSpecifier Access = AS_public; 5062 if (!NewFD->isInvalidDecl()) 5063 Access = NewFD->getPreviousDeclaration()->getAccess(); 5064 5065 NewFD->setAccess(Access); 5066 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5067 5068 PrincipalDecl->setObjectOfFriendDecl(true); 5069 } 5070 5071 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5072 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5073 PrincipalDecl->setNonMemberOperator(); 5074 5075 // If we have a function template, check the template parameter 5076 // list. This will check and merge default template arguments. 5077 if (FunctionTemplate) { 5078 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5079 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5080 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5081 D.getDeclSpec().isFriendSpecified() 5082 ? (IsFunctionDefinition 5083 ? TPC_FriendFunctionTemplateDefinition 5084 : TPC_FriendFunctionTemplate) 5085 : (D.getCXXScopeSpec().isSet() && 5086 DC && DC->isRecord() && 5087 DC->isDependentContext()) 5088 ? TPC_ClassTemplateMember 5089 : TPC_FunctionTemplate); 5090 } 5091 5092 if (NewFD->isInvalidDecl()) { 5093 // Ignore all the rest of this. 5094 } else if (!Redeclaration) { 5095 // Fake up an access specifier if it's supposed to be a class member. 5096 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5097 NewFD->setAccess(AS_public); 5098 5099 // Qualified decls generally require a previous declaration. 5100 if (D.getCXXScopeSpec().isSet()) { 5101 // ...with the major exception of templated-scope or 5102 // dependent-scope friend declarations. 5103 5104 // TODO: we currently also suppress this check in dependent 5105 // contexts because (1) the parameter depth will be off when 5106 // matching friend templates and (2) we might actually be 5107 // selecting a friend based on a dependent factor. But there 5108 // are situations where these conditions don't apply and we 5109 // can actually do this check immediately. 5110 if (isFriend && 5111 (TemplateParamLists.size() || 5112 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5113 CurContext->isDependentContext())) { 5114 // ignore these 5115 } else { 5116 // The user tried to provide an out-of-line definition for a 5117 // function that is a member of a class or namespace, but there 5118 // was no such member function declared (C++ [class.mfct]p2, 5119 // C++ [namespace.memdef]p2). For example: 5120 // 5121 // class X { 5122 // void f() const; 5123 // }; 5124 // 5125 // void X::f() { } // ill-formed 5126 // 5127 // Complain about this problem, and attempt to suggest close 5128 // matches (e.g., those that differ only in cv-qualifiers and 5129 // whether the parameter types are references). 5130 5131 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5132 } 5133 5134 // Unqualified local friend declarations are required to resolve 5135 // to something. 5136 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5137 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5138 } 5139 5140 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5141 !isFriend && !isFunctionTemplateSpecialization && 5142 !isExplicitSpecialization) { 5143 // An out-of-line member function declaration must also be a 5144 // definition (C++ [dcl.meaning]p1). 5145 // Note that this is not the case for explicit specializations of 5146 // function templates or member functions of class templates, per 5147 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5148 // for compatibility with old SWIG code which likes to generate them. 5149 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5150 << D.getCXXScopeSpec().getRange(); 5151 } 5152 } 5153 5154 5155 // Handle attributes. We need to have merged decls when handling attributes 5156 // (for example to check for conflicts, etc). 5157 // FIXME: This needs to happen before we merge declarations. Then, 5158 // let attribute merging cope with attribute conflicts. 5159 ProcessDeclAttributes(S, NewFD, D, 5160 /*NonInheritable=*/false, /*Inheritable=*/true); 5161 5162 // attributes declared post-definition are currently ignored 5163 // FIXME: This should happen during attribute merging 5164 if (Redeclaration && Previous.isSingleResult()) { 5165 const FunctionDecl *Def; 5166 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5167 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5168 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5169 Diag(Def->getLocation(), diag::note_previous_definition); 5170 } 5171 } 5172 5173 AddKnownFunctionAttributes(NewFD); 5174 5175 if (NewFD->hasAttr<OverloadableAttr>() && 5176 !NewFD->getType()->getAs<FunctionProtoType>()) { 5177 Diag(NewFD->getLocation(), 5178 diag::err_attribute_overloadable_no_prototype) 5179 << NewFD; 5180 5181 // Turn this into a variadic function with no parameters. 5182 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5183 FunctionProtoType::ExtProtoInfo EPI; 5184 EPI.Variadic = true; 5185 EPI.ExtInfo = FT->getExtInfo(); 5186 5187 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5188 NewFD->setType(R); 5189 } 5190 5191 // If there's a #pragma GCC visibility in scope, and this isn't a class 5192 // member, set the visibility of this function. 5193 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5194 AddPushedVisibilityAttribute(NewFD); 5195 5196 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5197 // marking the function. 5198 AddCFAuditedAttribute(NewFD); 5199 5200 // If this is a locally-scoped extern C function, update the 5201 // map of such names. 5202 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5203 && !NewFD->isInvalidDecl()) 5204 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5205 5206 // Set this FunctionDecl's range up to the right paren. 5207 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5208 5209 if (getLangOptions().CPlusPlus) { 5210 if (FunctionTemplate) { 5211 if (NewFD->isInvalidDecl()) 5212 FunctionTemplate->setInvalidDecl(); 5213 return FunctionTemplate; 5214 } 5215 } 5216 5217 MarkUnusedFileScopedDecl(NewFD); 5218 5219 if (getLangOptions().CUDA) 5220 if (IdentifierInfo *II = NewFD->getIdentifier()) 5221 if (!NewFD->isInvalidDecl() && 5222 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5223 if (II->isStr("cudaConfigureCall")) { 5224 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5225 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5226 5227 Context.setcudaConfigureCallDecl(NewFD); 5228 } 5229 } 5230 5231 // Here we have an function template explicit specialization at class scope. 5232 // The actually specialization will be postponed to template instatiation 5233 // time via the ClassScopeFunctionSpecializationDecl node. 5234 if (isDependentClassScopeExplicitSpecialization) { 5235 ClassScopeFunctionSpecializationDecl *NewSpec = 5236 ClassScopeFunctionSpecializationDecl::Create( 5237 Context, CurContext, SourceLocation(), 5238 cast<CXXMethodDecl>(NewFD)); 5239 CurContext->addDecl(NewSpec); 5240 AddToScope = false; 5241 } 5242 5243 return NewFD; 5244} 5245 5246/// \brief Perform semantic checking of a new function declaration. 5247/// 5248/// Performs semantic analysis of the new function declaration 5249/// NewFD. This routine performs all semantic checking that does not 5250/// require the actual declarator involved in the declaration, and is 5251/// used both for the declaration of functions as they are parsed 5252/// (called via ActOnDeclarator) and for the declaration of functions 5253/// that have been instantiated via C++ template instantiation (called 5254/// via InstantiateDecl). 5255/// 5256/// \param IsExplicitSpecialiation whether this new function declaration is 5257/// an explicit specialization of the previous declaration. 5258/// 5259/// This sets NewFD->isInvalidDecl() to true if there was an error. 5260void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5261 LookupResult &Previous, 5262 bool IsExplicitSpecialization, 5263 bool &Redeclaration) { 5264 assert(!NewFD->getResultType()->isVariablyModifiedType() 5265 && "Variably modified return types are not handled here"); 5266 5267 // Check for a previous declaration of this name. 5268 if (Previous.empty() && NewFD->isExternC()) { 5269 // Since we did not find anything by this name and we're declaring 5270 // an extern "C" function, look for a non-visible extern "C" 5271 // declaration with the same name. 5272 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5273 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5274 if (Pos != LocallyScopedExternalDecls.end()) 5275 Previous.addDecl(Pos->second); 5276 } 5277 5278 // Merge or overload the declaration with an existing declaration of 5279 // the same name, if appropriate. 5280 if (!Previous.empty()) { 5281 // Determine whether NewFD is an overload of PrevDecl or 5282 // a declaration that requires merging. If it's an overload, 5283 // there's no more work to do here; we'll just add the new 5284 // function to the scope. 5285 5286 NamedDecl *OldDecl = 0; 5287 if (!AllowOverloadingOfFunction(Previous, Context)) { 5288 Redeclaration = true; 5289 OldDecl = Previous.getFoundDecl(); 5290 } else { 5291 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5292 /*NewIsUsingDecl*/ false)) { 5293 case Ovl_Match: 5294 Redeclaration = true; 5295 break; 5296 5297 case Ovl_NonFunction: 5298 Redeclaration = true; 5299 break; 5300 5301 case Ovl_Overload: 5302 Redeclaration = false; 5303 break; 5304 } 5305 5306 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5307 // If a function name is overloadable in C, then every function 5308 // with that name must be marked "overloadable". 5309 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5310 << Redeclaration << NewFD; 5311 NamedDecl *OverloadedDecl = 0; 5312 if (Redeclaration) 5313 OverloadedDecl = OldDecl; 5314 else if (!Previous.empty()) 5315 OverloadedDecl = Previous.getRepresentativeDecl(); 5316 if (OverloadedDecl) 5317 Diag(OverloadedDecl->getLocation(), 5318 diag::note_attribute_overloadable_prev_overload); 5319 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5320 Context)); 5321 } 5322 } 5323 5324 if (Redeclaration) { 5325 // NewFD and OldDecl represent declarations that need to be 5326 // merged. 5327 if (MergeFunctionDecl(NewFD, OldDecl)) 5328 return NewFD->setInvalidDecl(); 5329 5330 Previous.clear(); 5331 Previous.addDecl(OldDecl); 5332 5333 if (FunctionTemplateDecl *OldTemplateDecl 5334 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5335 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5336 FunctionTemplateDecl *NewTemplateDecl 5337 = NewFD->getDescribedFunctionTemplate(); 5338 assert(NewTemplateDecl && "Template/non-template mismatch"); 5339 if (CXXMethodDecl *Method 5340 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5341 Method->setAccess(OldTemplateDecl->getAccess()); 5342 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5343 } 5344 5345 // If this is an explicit specialization of a member that is a function 5346 // template, mark it as a member specialization. 5347 if (IsExplicitSpecialization && 5348 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5349 NewTemplateDecl->setMemberSpecialization(); 5350 assert(OldTemplateDecl->isMemberSpecialization()); 5351 } 5352 5353 if (OldTemplateDecl->isModulePrivate()) 5354 NewTemplateDecl->setModulePrivate(); 5355 5356 } else { 5357 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5358 NewFD->setAccess(OldDecl->getAccess()); 5359 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5360 } 5361 } 5362 } 5363 5364 // Semantic checking for this function declaration (in isolation). 5365 if (getLangOptions().CPlusPlus) { 5366 // C++-specific checks. 5367 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5368 CheckConstructor(Constructor); 5369 } else if (CXXDestructorDecl *Destructor = 5370 dyn_cast<CXXDestructorDecl>(NewFD)) { 5371 CXXRecordDecl *Record = Destructor->getParent(); 5372 QualType ClassType = Context.getTypeDeclType(Record); 5373 5374 // FIXME: Shouldn't we be able to perform this check even when the class 5375 // type is dependent? Both gcc and edg can handle that. 5376 if (!ClassType->isDependentType()) { 5377 DeclarationName Name 5378 = Context.DeclarationNames.getCXXDestructorName( 5379 Context.getCanonicalType(ClassType)); 5380 if (NewFD->getDeclName() != Name) { 5381 Diag(NewFD->getLocation(), diag::err_destructor_name); 5382 return NewFD->setInvalidDecl(); 5383 } 5384 } 5385 } else if (CXXConversionDecl *Conversion 5386 = dyn_cast<CXXConversionDecl>(NewFD)) { 5387 ActOnConversionDeclarator(Conversion); 5388 } 5389 5390 // Find any virtual functions that this function overrides. 5391 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5392 if (!Method->isFunctionTemplateSpecialization() && 5393 !Method->getDescribedFunctionTemplate()) { 5394 if (AddOverriddenMethods(Method->getParent(), Method)) { 5395 // If the function was marked as "static", we have a problem. 5396 if (NewFD->getStorageClass() == SC_Static) { 5397 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5398 << NewFD->getDeclName(); 5399 for (CXXMethodDecl::method_iterator 5400 Overridden = Method->begin_overridden_methods(), 5401 OverriddenEnd = Method->end_overridden_methods(); 5402 Overridden != OverriddenEnd; 5403 ++Overridden) { 5404 Diag((*Overridden)->getLocation(), 5405 diag::note_overridden_virtual_function); 5406 } 5407 } 5408 } 5409 } 5410 } 5411 5412 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5413 if (NewFD->isOverloadedOperator() && 5414 CheckOverloadedOperatorDeclaration(NewFD)) 5415 return NewFD->setInvalidDecl(); 5416 5417 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5418 if (NewFD->getLiteralIdentifier() && 5419 CheckLiteralOperatorDeclaration(NewFD)) 5420 return NewFD->setInvalidDecl(); 5421 5422 // In C++, check default arguments now that we have merged decls. Unless 5423 // the lexical context is the class, because in this case this is done 5424 // during delayed parsing anyway. 5425 if (!CurContext->isRecord()) 5426 CheckCXXDefaultArguments(NewFD); 5427 5428 // If this function declares a builtin function, check the type of this 5429 // declaration against the expected type for the builtin. 5430 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5431 ASTContext::GetBuiltinTypeError Error; 5432 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5433 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5434 // The type of this function differs from the type of the builtin, 5435 // so forget about the builtin entirely. 5436 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5437 } 5438 } 5439 } 5440} 5441 5442void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5443 // C++ [basic.start.main]p3: A program that declares main to be inline 5444 // or static is ill-formed. 5445 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5446 // shall not appear in a declaration of main. 5447 // static main is not an error under C99, but we should warn about it. 5448 if (FD->getStorageClass() == SC_Static) 5449 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5450 ? diag::err_static_main : diag::warn_static_main) 5451 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5452 if (FD->isInlineSpecified()) 5453 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5454 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5455 5456 QualType T = FD->getType(); 5457 assert(T->isFunctionType() && "function decl is not of function type"); 5458 const FunctionType* FT = T->getAs<FunctionType>(); 5459 5460 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5461 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5462 FD->setInvalidDecl(true); 5463 } 5464 5465 // Treat protoless main() as nullary. 5466 if (isa<FunctionNoProtoType>(FT)) return; 5467 5468 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5469 unsigned nparams = FTP->getNumArgs(); 5470 assert(FD->getNumParams() == nparams); 5471 5472 bool HasExtraParameters = (nparams > 3); 5473 5474 // Darwin passes an undocumented fourth argument of type char**. If 5475 // other platforms start sprouting these, the logic below will start 5476 // getting shifty. 5477 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5478 HasExtraParameters = false; 5479 5480 if (HasExtraParameters) { 5481 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5482 FD->setInvalidDecl(true); 5483 nparams = 3; 5484 } 5485 5486 // FIXME: a lot of the following diagnostics would be improved 5487 // if we had some location information about types. 5488 5489 QualType CharPP = 5490 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5491 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5492 5493 for (unsigned i = 0; i < nparams; ++i) { 5494 QualType AT = FTP->getArgType(i); 5495 5496 bool mismatch = true; 5497 5498 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5499 mismatch = false; 5500 else if (Expected[i] == CharPP) { 5501 // As an extension, the following forms are okay: 5502 // char const ** 5503 // char const * const * 5504 // char * const * 5505 5506 QualifierCollector qs; 5507 const PointerType* PT; 5508 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5509 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5510 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5511 qs.removeConst(); 5512 mismatch = !qs.empty(); 5513 } 5514 } 5515 5516 if (mismatch) { 5517 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5518 // TODO: suggest replacing given type with expected type 5519 FD->setInvalidDecl(true); 5520 } 5521 } 5522 5523 if (nparams == 1 && !FD->isInvalidDecl()) { 5524 Diag(FD->getLocation(), diag::warn_main_one_arg); 5525 } 5526 5527 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5528 Diag(FD->getLocation(), diag::err_main_template_decl); 5529 FD->setInvalidDecl(); 5530 } 5531} 5532 5533bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5534 // FIXME: Need strict checking. In C89, we need to check for 5535 // any assignment, increment, decrement, function-calls, or 5536 // commas outside of a sizeof. In C99, it's the same list, 5537 // except that the aforementioned are allowed in unevaluated 5538 // expressions. Everything else falls under the 5539 // "may accept other forms of constant expressions" exception. 5540 // (We never end up here for C++, so the constant expression 5541 // rules there don't matter.) 5542 if (Init->isConstantInitializer(Context, false)) 5543 return false; 5544 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5545 << Init->getSourceRange(); 5546 return true; 5547} 5548 5549namespace { 5550 // Visits an initialization expression to see if OrigDecl is evaluated in 5551 // its own initialization and throws a warning if it does. 5552 class SelfReferenceChecker 5553 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5554 Sema &S; 5555 Decl *OrigDecl; 5556 bool isRecordType; 5557 bool isPODType; 5558 5559 public: 5560 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5561 5562 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5563 S(S), OrigDecl(OrigDecl) { 5564 isPODType = false; 5565 isRecordType = false; 5566 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5567 isPODType = VD->getType().isPODType(S.Context); 5568 isRecordType = VD->getType()->isRecordType(); 5569 } 5570 } 5571 5572 void VisitExpr(Expr *E) { 5573 if (isa<ObjCMessageExpr>(*E)) return; 5574 if (isRecordType) { 5575 Expr *expr = E; 5576 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5577 ValueDecl *VD = ME->getMemberDecl(); 5578 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5579 expr = ME->getBase(); 5580 } 5581 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5582 HandleDeclRefExpr(DRE); 5583 return; 5584 } 5585 } 5586 Inherited::VisitExpr(E); 5587 } 5588 5589 void VisitMemberExpr(MemberExpr *E) { 5590 if (E->getType()->canDecayToPointerType()) return; 5591 if (isa<FieldDecl>(E->getMemberDecl())) 5592 if (DeclRefExpr *DRE 5593 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5594 HandleDeclRefExpr(DRE); 5595 return; 5596 } 5597 Inherited::VisitMemberExpr(E); 5598 } 5599 5600 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5601 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5602 (isRecordType && E->getCastKind() == CK_NoOp)) { 5603 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5604 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5605 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5606 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5607 HandleDeclRefExpr(DRE); 5608 return; 5609 } 5610 } 5611 Inherited::VisitImplicitCastExpr(E); 5612 } 5613 5614 void VisitUnaryOperator(UnaryOperator *E) { 5615 // For POD record types, addresses of its own members are well-defined. 5616 if (isRecordType && isPODType) return; 5617 Inherited::VisitUnaryOperator(E); 5618 } 5619 5620 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5621 Decl* ReferenceDecl = DRE->getDecl(); 5622 if (OrigDecl != ReferenceDecl) return; 5623 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5624 Sema::NotForRedeclaration); 5625 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5626 S.PDiag(diag::warn_uninit_self_reference_in_init) 5627 << Result.getLookupName() 5628 << OrigDecl->getLocation() 5629 << DRE->getSourceRange()); 5630 } 5631 }; 5632} 5633 5634/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5635void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5636 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5637} 5638 5639/// AddInitializerToDecl - Adds the initializer Init to the 5640/// declaration dcl. If DirectInit is true, this is C++ direct 5641/// initialization rather than copy initialization. 5642void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5643 bool DirectInit, bool TypeMayContainAuto) { 5644 // If there is no declaration, there was an error parsing it. Just ignore 5645 // the initializer. 5646 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5647 return; 5648 5649 // Check for self-references within variable initializers. 5650 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5651 // Variables declared within a function/method body are handled 5652 // by a dataflow analysis. 5653 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5654 CheckSelfReference(RealDecl, Init); 5655 } 5656 else { 5657 CheckSelfReference(RealDecl, Init); 5658 } 5659 5660 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5661 // With declarators parsed the way they are, the parser cannot 5662 // distinguish between a normal initializer and a pure-specifier. 5663 // Thus this grotesque test. 5664 IntegerLiteral *IL; 5665 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5666 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5667 CheckPureMethod(Method, Init->getSourceRange()); 5668 else { 5669 Diag(Method->getLocation(), diag::err_member_function_initialization) 5670 << Method->getDeclName() << Init->getSourceRange(); 5671 Method->setInvalidDecl(); 5672 } 5673 return; 5674 } 5675 5676 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5677 if (!VDecl) { 5678 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5679 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5680 RealDecl->setInvalidDecl(); 5681 return; 5682 } 5683 5684 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5685 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5686 TypeSourceInfo *DeducedType = 0; 5687 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5688 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5689 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5690 << Init->getSourceRange(); 5691 if (!DeducedType) { 5692 RealDecl->setInvalidDecl(); 5693 return; 5694 } 5695 VDecl->setTypeSourceInfo(DeducedType); 5696 VDecl->setType(DeducedType->getType()); 5697 5698 // In ARC, infer lifetime. 5699 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5700 VDecl->setInvalidDecl(); 5701 5702 // If this is a redeclaration, check that the type we just deduced matches 5703 // the previously declared type. 5704 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5705 MergeVarDeclTypes(VDecl, Old); 5706 } 5707 5708 5709 // A definition must end up with a complete type, which means it must be 5710 // complete with the restriction that an array type might be completed by the 5711 // initializer; note that later code assumes this restriction. 5712 QualType BaseDeclType = VDecl->getType(); 5713 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5714 BaseDeclType = Array->getElementType(); 5715 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5716 diag::err_typecheck_decl_incomplete_type)) { 5717 RealDecl->setInvalidDecl(); 5718 return; 5719 } 5720 5721 // The variable can not have an abstract class type. 5722 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5723 diag::err_abstract_type_in_decl, 5724 AbstractVariableType)) 5725 VDecl->setInvalidDecl(); 5726 5727 const VarDecl *Def; 5728 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5729 Diag(VDecl->getLocation(), diag::err_redefinition) 5730 << VDecl->getDeclName(); 5731 Diag(Def->getLocation(), diag::note_previous_definition); 5732 VDecl->setInvalidDecl(); 5733 return; 5734 } 5735 5736 const VarDecl* PrevInit = 0; 5737 if (getLangOptions().CPlusPlus) { 5738 // C++ [class.static.data]p4 5739 // If a static data member is of const integral or const 5740 // enumeration type, its declaration in the class definition can 5741 // specify a constant-initializer which shall be an integral 5742 // constant expression (5.19). In that case, the member can appear 5743 // in integral constant expressions. The member shall still be 5744 // defined in a namespace scope if it is used in the program and the 5745 // namespace scope definition shall not contain an initializer. 5746 // 5747 // We already performed a redefinition check above, but for static 5748 // data members we also need to check whether there was an in-class 5749 // declaration with an initializer. 5750 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5751 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5752 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5753 return; 5754 } 5755 5756 if (VDecl->hasLocalStorage()) 5757 getCurFunction()->setHasBranchProtectedScope(); 5758 5759 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5760 VDecl->setInvalidDecl(); 5761 return; 5762 } 5763 } 5764 5765 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5766 // a kernel function cannot be initialized." 5767 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5768 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5769 VDecl->setInvalidDecl(); 5770 return; 5771 } 5772 5773 // Capture the variable that is being initialized and the style of 5774 // initialization. 5775 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5776 5777 // FIXME: Poor source location information. 5778 InitializationKind Kind 5779 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5780 Init->getLocStart(), 5781 Init->getLocEnd()) 5782 : InitializationKind::CreateCopy(VDecl->getLocation(), 5783 Init->getLocStart()); 5784 5785 // Get the decls type and save a reference for later, since 5786 // CheckInitializerTypes may change it. 5787 QualType DclT = VDecl->getType(), SavT = DclT; 5788 if (VDecl->isLocalVarDecl()) { 5789 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5790 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5791 VDecl->setInvalidDecl(); 5792 } else if (!VDecl->isInvalidDecl()) { 5793 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5794 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5795 MultiExprArg(*this, &Init, 1), 5796 &DclT); 5797 if (Result.isInvalid()) { 5798 VDecl->setInvalidDecl(); 5799 return; 5800 } 5801 5802 Init = Result.takeAs<Expr>(); 5803 5804 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5805 // Don't check invalid declarations to avoid emitting useless diagnostics. 5806 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5807 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5808 CheckForConstantInitializer(Init, DclT); 5809 } 5810 } 5811 } else if (VDecl->isStaticDataMember() && 5812 VDecl->getLexicalDeclContext()->isRecord()) { 5813 // This is an in-class initialization for a static data member, e.g., 5814 // 5815 // struct S { 5816 // static const int value = 17; 5817 // }; 5818 5819 // Try to perform the initialization regardless. 5820 if (!VDecl->isInvalidDecl()) { 5821 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5822 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5823 MultiExprArg(*this, &Init, 1), 5824 &DclT); 5825 if (Result.isInvalid()) { 5826 VDecl->setInvalidDecl(); 5827 return; 5828 } 5829 5830 Init = Result.takeAs<Expr>(); 5831 } 5832 5833 // C++ [class.mem]p4: 5834 // A member-declarator can contain a constant-initializer only 5835 // if it declares a static member (9.4) of const integral or 5836 // const enumeration type, see 9.4.2. 5837 // 5838 // C++0x [class.static.data]p3: 5839 // If a non-volatile const static data member is of integral or 5840 // enumeration type, its declaration in the class definition can 5841 // specify a brace-or-equal-initializer in which every initalizer-clause 5842 // that is an assignment-expression is a constant expression. A static 5843 // data member of literal type can be declared in the class definition 5844 // with the constexpr specifier; if so, its declaration shall specify a 5845 // brace-or-equal-initializer in which every initializer-clause that is 5846 // an assignment-expression is a constant expression. 5847 QualType T = VDecl->getType(); 5848 5849 // Do nothing on dependent types. 5850 if (T->isDependentType()) { 5851 5852 // Allow any 'static constexpr' members, whether or not they are of literal 5853 // type. We separately check that the initializer is a constant expression, 5854 // which implicitly requires the member to be of literal type. 5855 } else if (VDecl->isConstexpr()) { 5856 5857 // Require constness. 5858 } else if (!T.isConstQualified()) { 5859 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5860 << Init->getSourceRange(); 5861 VDecl->setInvalidDecl(); 5862 5863 // We allow integer constant expressions in all cases. 5864 } else if (T->isIntegralOrEnumerationType()) { 5865 // Check whether the expression is a constant expression. 5866 SourceLocation Loc; 5867 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5868 // In C++0x, a non-constexpr const static data member with an 5869 // in-class initializer cannot be volatile. 5870 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5871 else if (Init->isValueDependent()) 5872 ; // Nothing to check. 5873 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5874 ; // Ok, it's an ICE! 5875 else if (Init->isEvaluatable(Context)) { 5876 // If we can constant fold the initializer through heroics, accept it, 5877 // but report this as a use of an extension for -pedantic. 5878 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5879 << Init->getSourceRange(); 5880 } else { 5881 // Otherwise, this is some crazy unknown case. Report the issue at the 5882 // location provided by the isIntegerConstantExpr failed check. 5883 Diag(Loc, diag::err_in_class_initializer_non_constant) 5884 << Init->getSourceRange(); 5885 VDecl->setInvalidDecl(); 5886 } 5887 5888 // We allow floating-point constants as an extension. 5889 } else if (T->isFloatingType()) { // also permits complex, which is ok 5890 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5891 << T << Init->getSourceRange(); 5892 if (getLangOptions().CPlusPlus0x) 5893 Diag(VDecl->getLocation(), 5894 diag::note_in_class_initializer_float_type_constexpr) 5895 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5896 5897 if (!Init->isValueDependent() && 5898 !Init->isConstantInitializer(Context, false)) { 5899 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5900 << Init->getSourceRange(); 5901 VDecl->setInvalidDecl(); 5902 } 5903 5904 // Suggest adding 'constexpr' in C++0x for literal types. 5905 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 5906 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 5907 << T << Init->getSourceRange() 5908 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5909 VDecl->setConstexpr(true); 5910 5911 } else { 5912 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5913 << T << Init->getSourceRange(); 5914 VDecl->setInvalidDecl(); 5915 } 5916 } else if (VDecl->isFileVarDecl()) { 5917 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5918 (!getLangOptions().CPlusPlus || 5919 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5920 Diag(VDecl->getLocation(), diag::warn_extern_init); 5921 if (!VDecl->isInvalidDecl()) { 5922 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5923 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5924 MultiExprArg(*this, &Init, 1), 5925 &DclT); 5926 if (Result.isInvalid()) { 5927 VDecl->setInvalidDecl(); 5928 return; 5929 } 5930 5931 Init = Result.takeAs<Expr>(); 5932 } 5933 5934 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5935 // Don't check invalid declarations to avoid emitting useless diagnostics. 5936 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5937 // C99 6.7.8p4. All file scoped initializers need to be constant. 5938 CheckForConstantInitializer(Init, DclT); 5939 } 5940 } 5941 // If the type changed, it means we had an incomplete type that was 5942 // completed by the initializer. For example: 5943 // int ary[] = { 1, 3, 5 }; 5944 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5945 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5946 VDecl->setType(DclT); 5947 Init->setType(DclT); 5948 } 5949 5950 // Check any implicit conversions within the expression. 5951 CheckImplicitConversions(Init, VDecl->getLocation()); 5952 5953 if (!VDecl->isInvalidDecl()) 5954 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5955 5956 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 5957 !VDecl->getType()->isDependentType() && 5958 !Init->isTypeDependent() && !Init->isValueDependent() && 5959 !Init->isConstantInitializer(Context, 5960 VDecl->getType()->isReferenceType())) { 5961 // FIXME: Improve this diagnostic to explain why the initializer is not 5962 // a constant expression. 5963 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 5964 << VDecl << Init->getSourceRange(); 5965 } 5966 5967 Init = MaybeCreateExprWithCleanups(Init); 5968 // Attach the initializer to the decl. 5969 VDecl->setInit(Init); 5970 5971 CheckCompleteVariableDeclaration(VDecl); 5972} 5973 5974/// ActOnInitializerError - Given that there was an error parsing an 5975/// initializer for the given declaration, try to return to some form 5976/// of sanity. 5977void Sema::ActOnInitializerError(Decl *D) { 5978 // Our main concern here is re-establishing invariants like "a 5979 // variable's type is either dependent or complete". 5980 if (!D || D->isInvalidDecl()) return; 5981 5982 VarDecl *VD = dyn_cast<VarDecl>(D); 5983 if (!VD) return; 5984 5985 // Auto types are meaningless if we can't make sense of the initializer. 5986 if (ParsingInitForAutoVars.count(D)) { 5987 D->setInvalidDecl(); 5988 return; 5989 } 5990 5991 QualType Ty = VD->getType(); 5992 if (Ty->isDependentType()) return; 5993 5994 // Require a complete type. 5995 if (RequireCompleteType(VD->getLocation(), 5996 Context.getBaseElementType(Ty), 5997 diag::err_typecheck_decl_incomplete_type)) { 5998 VD->setInvalidDecl(); 5999 return; 6000 } 6001 6002 // Require an abstract type. 6003 if (RequireNonAbstractType(VD->getLocation(), Ty, 6004 diag::err_abstract_type_in_decl, 6005 AbstractVariableType)) { 6006 VD->setInvalidDecl(); 6007 return; 6008 } 6009 6010 // Don't bother complaining about constructors or destructors, 6011 // though. 6012} 6013 6014void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6015 bool TypeMayContainAuto) { 6016 // If there is no declaration, there was an error parsing it. Just ignore it. 6017 if (RealDecl == 0) 6018 return; 6019 6020 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6021 QualType Type = Var->getType(); 6022 6023 // C++0x [dcl.spec.auto]p3 6024 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6025 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6026 << Var->getDeclName() << Type; 6027 Var->setInvalidDecl(); 6028 return; 6029 } 6030 6031 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6032 // have an initializer. 6033 // C++0x [class.static.data]p3: A static data member can be declared with 6034 // the constexpr specifier; if so, its declaration shall specify 6035 // a brace-or-equal-initializer. 6036 // 6037 // A static data member's definition may inherit an initializer from an 6038 // in-class declaration. 6039 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6040 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6041 << Var->getDeclName(); 6042 Var->setInvalidDecl(); 6043 return; 6044 } 6045 6046 switch (Var->isThisDeclarationADefinition()) { 6047 case VarDecl::Definition: 6048 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6049 break; 6050 6051 // We have an out-of-line definition of a static data member 6052 // that has an in-class initializer, so we type-check this like 6053 // a declaration. 6054 // 6055 // Fall through 6056 6057 case VarDecl::DeclarationOnly: 6058 // It's only a declaration. 6059 6060 // Block scope. C99 6.7p7: If an identifier for an object is 6061 // declared with no linkage (C99 6.2.2p6), the type for the 6062 // object shall be complete. 6063 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6064 !Var->getLinkage() && !Var->isInvalidDecl() && 6065 RequireCompleteType(Var->getLocation(), Type, 6066 diag::err_typecheck_decl_incomplete_type)) 6067 Var->setInvalidDecl(); 6068 6069 // Make sure that the type is not abstract. 6070 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6071 RequireNonAbstractType(Var->getLocation(), Type, 6072 diag::err_abstract_type_in_decl, 6073 AbstractVariableType)) 6074 Var->setInvalidDecl(); 6075 return; 6076 6077 case VarDecl::TentativeDefinition: 6078 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6079 // object that has file scope without an initializer, and without a 6080 // storage-class specifier or with the storage-class specifier "static", 6081 // constitutes a tentative definition. Note: A tentative definition with 6082 // external linkage is valid (C99 6.2.2p5). 6083 if (!Var->isInvalidDecl()) { 6084 if (const IncompleteArrayType *ArrayT 6085 = Context.getAsIncompleteArrayType(Type)) { 6086 if (RequireCompleteType(Var->getLocation(), 6087 ArrayT->getElementType(), 6088 diag::err_illegal_decl_array_incomplete_type)) 6089 Var->setInvalidDecl(); 6090 } else if (Var->getStorageClass() == SC_Static) { 6091 // C99 6.9.2p3: If the declaration of an identifier for an object is 6092 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6093 // declared type shall not be an incomplete type. 6094 // NOTE: code such as the following 6095 // static struct s; 6096 // struct s { int a; }; 6097 // is accepted by gcc. Hence here we issue a warning instead of 6098 // an error and we do not invalidate the static declaration. 6099 // NOTE: to avoid multiple warnings, only check the first declaration. 6100 if (Var->getPreviousDeclaration() == 0) 6101 RequireCompleteType(Var->getLocation(), Type, 6102 diag::ext_typecheck_decl_incomplete_type); 6103 } 6104 } 6105 6106 // Record the tentative definition; we're done. 6107 if (!Var->isInvalidDecl()) 6108 TentativeDefinitions.push_back(Var); 6109 return; 6110 } 6111 6112 // Provide a specific diagnostic for uninitialized variable 6113 // definitions with incomplete array type. 6114 if (Type->isIncompleteArrayType()) { 6115 Diag(Var->getLocation(), 6116 diag::err_typecheck_incomplete_array_needs_initializer); 6117 Var->setInvalidDecl(); 6118 return; 6119 } 6120 6121 // Provide a specific diagnostic for uninitialized variable 6122 // definitions with reference type. 6123 if (Type->isReferenceType()) { 6124 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6125 << Var->getDeclName() 6126 << SourceRange(Var->getLocation(), Var->getLocation()); 6127 Var->setInvalidDecl(); 6128 return; 6129 } 6130 6131 // Do not attempt to type-check the default initializer for a 6132 // variable with dependent type. 6133 if (Type->isDependentType()) 6134 return; 6135 6136 if (Var->isInvalidDecl()) 6137 return; 6138 6139 if (RequireCompleteType(Var->getLocation(), 6140 Context.getBaseElementType(Type), 6141 diag::err_typecheck_decl_incomplete_type)) { 6142 Var->setInvalidDecl(); 6143 return; 6144 } 6145 6146 // The variable can not have an abstract class type. 6147 if (RequireNonAbstractType(Var->getLocation(), Type, 6148 diag::err_abstract_type_in_decl, 6149 AbstractVariableType)) { 6150 Var->setInvalidDecl(); 6151 return; 6152 } 6153 6154 // Check for jumps past the implicit initializer. C++0x 6155 // clarifies that this applies to a "variable with automatic 6156 // storage duration", not a "local variable". 6157 // C++0x [stmt.dcl]p3 6158 // A program that jumps from a point where a variable with automatic 6159 // storage duration is not in scope to a point where it is in scope is 6160 // ill-formed unless the variable has scalar type, class type with a 6161 // trivial default constructor and a trivial destructor, a cv-qualified 6162 // version of one of these types, or an array of one of the preceding 6163 // types and is declared without an initializer. 6164 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6165 if (const RecordType *Record 6166 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6167 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6168 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6169 (getLangOptions().CPlusPlus0x && 6170 (!CXXRecord->hasTrivialDefaultConstructor() || 6171 !CXXRecord->hasTrivialDestructor()))) 6172 getCurFunction()->setHasBranchProtectedScope(); 6173 } 6174 } 6175 6176 // C++03 [dcl.init]p9: 6177 // If no initializer is specified for an object, and the 6178 // object is of (possibly cv-qualified) non-POD class type (or 6179 // array thereof), the object shall be default-initialized; if 6180 // the object is of const-qualified type, the underlying class 6181 // type shall have a user-declared default 6182 // constructor. Otherwise, if no initializer is specified for 6183 // a non- static object, the object and its subobjects, if 6184 // any, have an indeterminate initial value); if the object 6185 // or any of its subobjects are of const-qualified type, the 6186 // program is ill-formed. 6187 // C++0x [dcl.init]p11: 6188 // If no initializer is specified for an object, the object is 6189 // default-initialized; [...]. 6190 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6191 InitializationKind Kind 6192 = InitializationKind::CreateDefault(Var->getLocation()); 6193 6194 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6195 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6196 MultiExprArg(*this, 0, 0)); 6197 if (Init.isInvalid()) 6198 Var->setInvalidDecl(); 6199 else if (Init.get()) 6200 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6201 6202 CheckCompleteVariableDeclaration(Var); 6203 } 6204} 6205 6206void Sema::ActOnCXXForRangeDecl(Decl *D) { 6207 VarDecl *VD = dyn_cast<VarDecl>(D); 6208 if (!VD) { 6209 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6210 D->setInvalidDecl(); 6211 return; 6212 } 6213 6214 VD->setCXXForRangeDecl(true); 6215 6216 // for-range-declaration cannot be given a storage class specifier. 6217 int Error = -1; 6218 switch (VD->getStorageClassAsWritten()) { 6219 case SC_None: 6220 break; 6221 case SC_Extern: 6222 Error = 0; 6223 break; 6224 case SC_Static: 6225 Error = 1; 6226 break; 6227 case SC_PrivateExtern: 6228 Error = 2; 6229 break; 6230 case SC_Auto: 6231 Error = 3; 6232 break; 6233 case SC_Register: 6234 Error = 4; 6235 break; 6236 case SC_OpenCLWorkGroupLocal: 6237 llvm_unreachable("Unexpected storage class"); 6238 } 6239 if (VD->isConstexpr()) 6240 Error = 5; 6241 if (Error != -1) { 6242 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6243 << VD->getDeclName() << Error; 6244 D->setInvalidDecl(); 6245 } 6246} 6247 6248void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6249 if (var->isInvalidDecl()) return; 6250 6251 // In ARC, don't allow jumps past the implicit initialization of a 6252 // local retaining variable. 6253 if (getLangOptions().ObjCAutoRefCount && 6254 var->hasLocalStorage()) { 6255 switch (var->getType().getObjCLifetime()) { 6256 case Qualifiers::OCL_None: 6257 case Qualifiers::OCL_ExplicitNone: 6258 case Qualifiers::OCL_Autoreleasing: 6259 break; 6260 6261 case Qualifiers::OCL_Weak: 6262 case Qualifiers::OCL_Strong: 6263 getCurFunction()->setHasBranchProtectedScope(); 6264 break; 6265 } 6266 } 6267 6268 // All the following checks are C++ only. 6269 if (!getLangOptions().CPlusPlus) return; 6270 6271 QualType baseType = Context.getBaseElementType(var->getType()); 6272 if (baseType->isDependentType()) return; 6273 6274 // __block variables might require us to capture a copy-initializer. 6275 if (var->hasAttr<BlocksAttr>()) { 6276 // It's currently invalid to ever have a __block variable with an 6277 // array type; should we diagnose that here? 6278 6279 // Regardless, we don't want to ignore array nesting when 6280 // constructing this copy. 6281 QualType type = var->getType(); 6282 6283 if (type->isStructureOrClassType()) { 6284 SourceLocation poi = var->getLocation(); 6285 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6286 ExprResult result = 6287 PerformCopyInitialization( 6288 InitializedEntity::InitializeBlock(poi, type, false), 6289 poi, Owned(varRef)); 6290 if (!result.isInvalid()) { 6291 result = MaybeCreateExprWithCleanups(result); 6292 Expr *init = result.takeAs<Expr>(); 6293 Context.setBlockVarCopyInits(var, init); 6294 } 6295 } 6296 } 6297 6298 // Check for global constructors. 6299 if (!var->getDeclContext()->isDependentContext() && 6300 var->hasGlobalStorage() && 6301 !var->isStaticLocal() && 6302 var->getInit() && 6303 !var->getInit()->isConstantInitializer(Context, 6304 baseType->isReferenceType())) 6305 Diag(var->getLocation(), diag::warn_global_constructor) 6306 << var->getInit()->getSourceRange(); 6307 6308 // Require the destructor. 6309 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6310 FinalizeVarWithDestructor(var, recordType); 6311} 6312 6313/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6314/// any semantic actions necessary after any initializer has been attached. 6315void 6316Sema::FinalizeDeclaration(Decl *ThisDecl) { 6317 // Note that we are no longer parsing the initializer for this declaration. 6318 ParsingInitForAutoVars.erase(ThisDecl); 6319} 6320 6321Sema::DeclGroupPtrTy 6322Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6323 Decl **Group, unsigned NumDecls) { 6324 SmallVector<Decl*, 8> Decls; 6325 6326 if (DS.isTypeSpecOwned()) 6327 Decls.push_back(DS.getRepAsDecl()); 6328 6329 for (unsigned i = 0; i != NumDecls; ++i) 6330 if (Decl *D = Group[i]) 6331 Decls.push_back(D); 6332 6333 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6334 DS.getTypeSpecType() == DeclSpec::TST_auto); 6335} 6336 6337/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6338/// group, performing any necessary semantic checking. 6339Sema::DeclGroupPtrTy 6340Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6341 bool TypeMayContainAuto) { 6342 // C++0x [dcl.spec.auto]p7: 6343 // If the type deduced for the template parameter U is not the same in each 6344 // deduction, the program is ill-formed. 6345 // FIXME: When initializer-list support is added, a distinction is needed 6346 // between the deduced type U and the deduced type which 'auto' stands for. 6347 // auto a = 0, b = { 1, 2, 3 }; 6348 // is legal because the deduced type U is 'int' in both cases. 6349 if (TypeMayContainAuto && NumDecls > 1) { 6350 QualType Deduced; 6351 CanQualType DeducedCanon; 6352 VarDecl *DeducedDecl = 0; 6353 for (unsigned i = 0; i != NumDecls; ++i) { 6354 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6355 AutoType *AT = D->getType()->getContainedAutoType(); 6356 // Don't reissue diagnostics when instantiating a template. 6357 if (AT && D->isInvalidDecl()) 6358 break; 6359 if (AT && AT->isDeduced()) { 6360 QualType U = AT->getDeducedType(); 6361 CanQualType UCanon = Context.getCanonicalType(U); 6362 if (Deduced.isNull()) { 6363 Deduced = U; 6364 DeducedCanon = UCanon; 6365 DeducedDecl = D; 6366 } else if (DeducedCanon != UCanon) { 6367 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6368 diag::err_auto_different_deductions) 6369 << Deduced << DeducedDecl->getDeclName() 6370 << U << D->getDeclName() 6371 << DeducedDecl->getInit()->getSourceRange() 6372 << D->getInit()->getSourceRange(); 6373 D->setInvalidDecl(); 6374 break; 6375 } 6376 } 6377 } 6378 } 6379 } 6380 6381 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6382} 6383 6384 6385/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6386/// to introduce parameters into function prototype scope. 6387Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6388 const DeclSpec &DS = D.getDeclSpec(); 6389 6390 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6391 VarDecl::StorageClass StorageClass = SC_None; 6392 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6393 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6394 StorageClass = SC_Register; 6395 StorageClassAsWritten = SC_Register; 6396 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6397 Diag(DS.getStorageClassSpecLoc(), 6398 diag::err_invalid_storage_class_in_func_decl); 6399 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6400 } 6401 6402 if (D.getDeclSpec().isThreadSpecified()) 6403 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6404 if (D.getDeclSpec().isConstexprSpecified()) 6405 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6406 << 0; 6407 6408 DiagnoseFunctionSpecifiers(D); 6409 6410 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6411 QualType parmDeclType = TInfo->getType(); 6412 6413 if (getLangOptions().CPlusPlus) { 6414 // Check that there are no default arguments inside the type of this 6415 // parameter. 6416 CheckExtraCXXDefaultArguments(D); 6417 6418 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6419 if (D.getCXXScopeSpec().isSet()) { 6420 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6421 << D.getCXXScopeSpec().getRange(); 6422 D.getCXXScopeSpec().clear(); 6423 } 6424 } 6425 6426 // Ensure we have a valid name 6427 IdentifierInfo *II = 0; 6428 if (D.hasName()) { 6429 II = D.getIdentifier(); 6430 if (!II) { 6431 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6432 << GetNameForDeclarator(D).getName().getAsString(); 6433 D.setInvalidType(true); 6434 } 6435 } 6436 6437 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6438 if (II) { 6439 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6440 ForRedeclaration); 6441 LookupName(R, S); 6442 if (R.isSingleResult()) { 6443 NamedDecl *PrevDecl = R.getFoundDecl(); 6444 if (PrevDecl->isTemplateParameter()) { 6445 // Maybe we will complain about the shadowed template parameter. 6446 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6447 // Just pretend that we didn't see the previous declaration. 6448 PrevDecl = 0; 6449 } else if (S->isDeclScope(PrevDecl)) { 6450 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6451 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6452 6453 // Recover by removing the name 6454 II = 0; 6455 D.SetIdentifier(0, D.getIdentifierLoc()); 6456 D.setInvalidType(true); 6457 } 6458 } 6459 } 6460 6461 // Temporarily put parameter variables in the translation unit, not 6462 // the enclosing context. This prevents them from accidentally 6463 // looking like class members in C++. 6464 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6465 D.getSourceRange().getBegin(), 6466 D.getIdentifierLoc(), II, 6467 parmDeclType, TInfo, 6468 StorageClass, StorageClassAsWritten); 6469 6470 if (D.isInvalidType()) 6471 New->setInvalidDecl(); 6472 6473 assert(S->isFunctionPrototypeScope()); 6474 assert(S->getFunctionPrototypeDepth() >= 1); 6475 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6476 S->getNextFunctionPrototypeIndex()); 6477 6478 // Add the parameter declaration into this scope. 6479 S->AddDecl(New); 6480 if (II) 6481 IdResolver.AddDecl(New); 6482 6483 ProcessDeclAttributes(S, New, D); 6484 6485 if (D.getDeclSpec().isModulePrivateSpecified()) 6486 Diag(New->getLocation(), diag::err_module_private_local) 6487 << 1 << New->getDeclName() 6488 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6489 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6490 6491 if (New->hasAttr<BlocksAttr>()) { 6492 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6493 } 6494 return New; 6495} 6496 6497/// \brief Synthesizes a variable for a parameter arising from a 6498/// typedef. 6499ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6500 SourceLocation Loc, 6501 QualType T) { 6502 /* FIXME: setting StartLoc == Loc. 6503 Would it be worth to modify callers so as to provide proper source 6504 location for the unnamed parameters, embedding the parameter's type? */ 6505 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6506 T, Context.getTrivialTypeSourceInfo(T, Loc), 6507 SC_None, SC_None, 0); 6508 Param->setImplicit(); 6509 return Param; 6510} 6511 6512void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6513 ParmVarDecl * const *ParamEnd) { 6514 // Don't diagnose unused-parameter errors in template instantiations; we 6515 // will already have done so in the template itself. 6516 if (!ActiveTemplateInstantiations.empty()) 6517 return; 6518 6519 for (; Param != ParamEnd; ++Param) { 6520 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6521 !(*Param)->hasAttr<UnusedAttr>()) { 6522 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6523 << (*Param)->getDeclName(); 6524 } 6525 } 6526} 6527 6528void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6529 ParmVarDecl * const *ParamEnd, 6530 QualType ReturnTy, 6531 NamedDecl *D) { 6532 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6533 return; 6534 6535 // Warn if the return value is pass-by-value and larger than the specified 6536 // threshold. 6537 if (ReturnTy.isPODType(Context)) { 6538 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6539 if (Size > LangOpts.NumLargeByValueCopy) 6540 Diag(D->getLocation(), diag::warn_return_value_size) 6541 << D->getDeclName() << Size; 6542 } 6543 6544 // Warn if any parameter is pass-by-value and larger than the specified 6545 // threshold. 6546 for (; Param != ParamEnd; ++Param) { 6547 QualType T = (*Param)->getType(); 6548 if (!T.isPODType(Context)) 6549 continue; 6550 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6551 if (Size > LangOpts.NumLargeByValueCopy) 6552 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6553 << (*Param)->getDeclName() << Size; 6554 } 6555} 6556 6557ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6558 SourceLocation NameLoc, IdentifierInfo *Name, 6559 QualType T, TypeSourceInfo *TSInfo, 6560 VarDecl::StorageClass StorageClass, 6561 VarDecl::StorageClass StorageClassAsWritten) { 6562 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6563 if (getLangOptions().ObjCAutoRefCount && 6564 T.getObjCLifetime() == Qualifiers::OCL_None && 6565 T->isObjCLifetimeType()) { 6566 6567 Qualifiers::ObjCLifetime lifetime; 6568 6569 // Special cases for arrays: 6570 // - if it's const, use __unsafe_unretained 6571 // - otherwise, it's an error 6572 if (T->isArrayType()) { 6573 if (!T.isConstQualified()) { 6574 DelayedDiagnostics.add( 6575 sema::DelayedDiagnostic::makeForbiddenType( 6576 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6577 } 6578 lifetime = Qualifiers::OCL_ExplicitNone; 6579 } else { 6580 lifetime = T->getObjCARCImplicitLifetime(); 6581 } 6582 T = Context.getLifetimeQualifiedType(T, lifetime); 6583 } 6584 6585 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6586 Context.getAdjustedParameterType(T), 6587 TSInfo, 6588 StorageClass, StorageClassAsWritten, 6589 0); 6590 6591 // Parameters can not be abstract class types. 6592 // For record types, this is done by the AbstractClassUsageDiagnoser once 6593 // the class has been completely parsed. 6594 if (!CurContext->isRecord() && 6595 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6596 AbstractParamType)) 6597 New->setInvalidDecl(); 6598 6599 // Parameter declarators cannot be interface types. All ObjC objects are 6600 // passed by reference. 6601 if (T->isObjCObjectType()) { 6602 Diag(NameLoc, 6603 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6604 << FixItHint::CreateInsertion(NameLoc, "*"); 6605 T = Context.getObjCObjectPointerType(T); 6606 New->setType(T); 6607 } 6608 6609 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6610 // duration shall not be qualified by an address-space qualifier." 6611 // Since all parameters have automatic store duration, they can not have 6612 // an address space. 6613 if (T.getAddressSpace() != 0) { 6614 Diag(NameLoc, diag::err_arg_with_address_space); 6615 New->setInvalidDecl(); 6616 } 6617 6618 return New; 6619} 6620 6621void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6622 SourceLocation LocAfterDecls) { 6623 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6624 6625 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6626 // for a K&R function. 6627 if (!FTI.hasPrototype) { 6628 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6629 --i; 6630 if (FTI.ArgInfo[i].Param == 0) { 6631 llvm::SmallString<256> Code; 6632 llvm::raw_svector_ostream(Code) << " int " 6633 << FTI.ArgInfo[i].Ident->getName() 6634 << ";\n"; 6635 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6636 << FTI.ArgInfo[i].Ident 6637 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6638 6639 // Implicitly declare the argument as type 'int' for lack of a better 6640 // type. 6641 AttributeFactory attrs; 6642 DeclSpec DS(attrs); 6643 const char* PrevSpec; // unused 6644 unsigned DiagID; // unused 6645 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6646 PrevSpec, DiagID); 6647 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6648 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6649 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6650 } 6651 } 6652 } 6653} 6654 6655Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6656 Declarator &D) { 6657 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6658 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6659 Scope *ParentScope = FnBodyScope->getParent(); 6660 6661 Decl *DP = HandleDeclarator(ParentScope, D, 6662 MultiTemplateParamsArg(*this), 6663 /*IsFunctionDefinition=*/true); 6664 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6665} 6666 6667static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6668 // Don't warn about invalid declarations. 6669 if (FD->isInvalidDecl()) 6670 return false; 6671 6672 // Or declarations that aren't global. 6673 if (!FD->isGlobal()) 6674 return false; 6675 6676 // Don't warn about C++ member functions. 6677 if (isa<CXXMethodDecl>(FD)) 6678 return false; 6679 6680 // Don't warn about 'main'. 6681 if (FD->isMain()) 6682 return false; 6683 6684 // Don't warn about inline functions. 6685 if (FD->isInlined()) 6686 return false; 6687 6688 // Don't warn about function templates. 6689 if (FD->getDescribedFunctionTemplate()) 6690 return false; 6691 6692 // Don't warn about function template specializations. 6693 if (FD->isFunctionTemplateSpecialization()) 6694 return false; 6695 6696 bool MissingPrototype = true; 6697 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6698 Prev; Prev = Prev->getPreviousDeclaration()) { 6699 // Ignore any declarations that occur in function or method 6700 // scope, because they aren't visible from the header. 6701 if (Prev->getDeclContext()->isFunctionOrMethod()) 6702 continue; 6703 6704 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6705 break; 6706 } 6707 6708 return MissingPrototype; 6709} 6710 6711void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6712 // Don't complain if we're in GNU89 mode and the previous definition 6713 // was an extern inline function. 6714 const FunctionDecl *Definition; 6715 if (FD->isDefined(Definition) && 6716 !canRedefineFunction(Definition, getLangOptions())) { 6717 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6718 Definition->getStorageClass() == SC_Extern) 6719 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6720 << FD->getDeclName() << getLangOptions().CPlusPlus; 6721 else 6722 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6723 Diag(Definition->getLocation(), diag::note_previous_definition); 6724 } 6725} 6726 6727Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6728 // Clear the last template instantiation error context. 6729 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6730 6731 if (!D) 6732 return D; 6733 FunctionDecl *FD = 0; 6734 6735 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6736 FD = FunTmpl->getTemplatedDecl(); 6737 else 6738 FD = cast<FunctionDecl>(D); 6739 6740 // Enter a new function scope 6741 PushFunctionScope(); 6742 6743 // See if this is a redefinition. 6744 if (!FD->isLateTemplateParsed()) 6745 CheckForFunctionRedefinition(FD); 6746 6747 // Builtin functions cannot be defined. 6748 if (unsigned BuiltinID = FD->getBuiltinID()) { 6749 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6750 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6751 FD->setInvalidDecl(); 6752 } 6753 } 6754 6755 // The return type of a function definition must be complete 6756 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6757 QualType ResultType = FD->getResultType(); 6758 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6759 !FD->isInvalidDecl() && 6760 RequireCompleteType(FD->getLocation(), ResultType, 6761 diag::err_func_def_incomplete_result)) 6762 FD->setInvalidDecl(); 6763 6764 // GNU warning -Wmissing-prototypes: 6765 // Warn if a global function is defined without a previous 6766 // prototype declaration. This warning is issued even if the 6767 // definition itself provides a prototype. The aim is to detect 6768 // global functions that fail to be declared in header files. 6769 if (ShouldWarnAboutMissingPrototype(FD)) 6770 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6771 6772 if (FnBodyScope) 6773 PushDeclContext(FnBodyScope, FD); 6774 6775 // Check the validity of our function parameters 6776 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6777 /*CheckParameterNames=*/true); 6778 6779 // Introduce our parameters into the function scope 6780 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6781 ParmVarDecl *Param = FD->getParamDecl(p); 6782 Param->setOwningFunction(FD); 6783 6784 // If this has an identifier, add it to the scope stack. 6785 if (Param->getIdentifier() && FnBodyScope) { 6786 CheckShadow(FnBodyScope, Param); 6787 6788 PushOnScopeChains(Param, FnBodyScope); 6789 } 6790 } 6791 6792 // Checking attributes of current function definition 6793 // dllimport attribute. 6794 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6795 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6796 // dllimport attribute cannot be directly applied to definition. 6797 // Microsoft accepts dllimport for functions defined within class scope. 6798 if (!DA->isInherited() && 6799 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6800 Diag(FD->getLocation(), 6801 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6802 << "dllimport"; 6803 FD->setInvalidDecl(); 6804 return FD; 6805 } 6806 6807 // Visual C++ appears to not think this is an issue, so only issue 6808 // a warning when Microsoft extensions are disabled. 6809 if (!LangOpts.MicrosoftExt) { 6810 // If a symbol previously declared dllimport is later defined, the 6811 // attribute is ignored in subsequent references, and a warning is 6812 // emitted. 6813 Diag(FD->getLocation(), 6814 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6815 << FD->getName() << "dllimport"; 6816 } 6817 } 6818 return FD; 6819} 6820 6821/// \brief Given the set of return statements within a function body, 6822/// compute the variables that are subject to the named return value 6823/// optimization. 6824/// 6825/// Each of the variables that is subject to the named return value 6826/// optimization will be marked as NRVO variables in the AST, and any 6827/// return statement that has a marked NRVO variable as its NRVO candidate can 6828/// use the named return value optimization. 6829/// 6830/// This function applies a very simplistic algorithm for NRVO: if every return 6831/// statement in the function has the same NRVO candidate, that candidate is 6832/// the NRVO variable. 6833/// 6834/// FIXME: Employ a smarter algorithm that accounts for multiple return 6835/// statements and the lifetimes of the NRVO candidates. We should be able to 6836/// find a maximal set of NRVO variables. 6837void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6838 ReturnStmt **Returns = Scope->Returns.data(); 6839 6840 const VarDecl *NRVOCandidate = 0; 6841 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6842 if (!Returns[I]->getNRVOCandidate()) 6843 return; 6844 6845 if (!NRVOCandidate) 6846 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6847 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6848 return; 6849 } 6850 6851 if (NRVOCandidate) 6852 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6853} 6854 6855Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6856 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6857} 6858 6859Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6860 bool IsInstantiation) { 6861 FunctionDecl *FD = 0; 6862 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6863 if (FunTmpl) 6864 FD = FunTmpl->getTemplatedDecl(); 6865 else 6866 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6867 6868 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6869 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6870 6871 if (FD) { 6872 FD->setBody(Body); 6873 if (FD->isMain()) { 6874 // C and C++ allow for main to automagically return 0. 6875 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6876 FD->setHasImplicitReturnZero(true); 6877 WP.disableCheckFallThrough(); 6878 } else if (FD->hasAttr<NakedAttr>()) { 6879 // If the function is marked 'naked', don't complain about missing return 6880 // statements. 6881 WP.disableCheckFallThrough(); 6882 } 6883 6884 // MSVC permits the use of pure specifier (=0) on function definition, 6885 // defined at class scope, warn about this non standard construct. 6886 if (getLangOptions().MicrosoftExt && FD->isPure()) 6887 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6888 6889 if (!FD->isInvalidDecl()) { 6890 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6891 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6892 FD->getResultType(), FD); 6893 6894 // If this is a constructor, we need a vtable. 6895 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6896 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6897 6898 computeNRVO(Body, getCurFunction()); 6899 } 6900 6901 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6902 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6903 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6904 MD->setBody(Body); 6905 if (Body) 6906 MD->setEndLoc(Body->getLocEnd()); 6907 if (!MD->isInvalidDecl()) { 6908 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6909 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6910 MD->getResultType(), MD); 6911 6912 if (Body) 6913 computeNRVO(Body, getCurFunction()); 6914 } 6915 if (ObjCShouldCallSuperDealloc) { 6916 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6917 ObjCShouldCallSuperDealloc = false; 6918 } 6919 if (ObjCShouldCallSuperFinalize) { 6920 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6921 ObjCShouldCallSuperFinalize = false; 6922 } 6923 } else { 6924 return 0; 6925 } 6926 6927 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6928 "ObjC methods, which should have been handled in the block above."); 6929 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6930 "ObjC methods, which should have been handled in the block above."); 6931 6932 // Verify and clean out per-function state. 6933 if (Body) { 6934 // C++ constructors that have function-try-blocks can't have return 6935 // statements in the handlers of that block. (C++ [except.handle]p14) 6936 // Verify this. 6937 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6938 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6939 6940 // Verify that gotos and switch cases don't jump into scopes illegally. 6941 if (getCurFunction()->NeedsScopeChecking() && 6942 !dcl->isInvalidDecl() && 6943 !hasAnyUnrecoverableErrorsInThisFunction()) 6944 DiagnoseInvalidJumps(Body); 6945 6946 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6947 if (!Destructor->getParent()->isDependentType()) 6948 CheckDestructor(Destructor); 6949 6950 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6951 Destructor->getParent()); 6952 } 6953 6954 // If any errors have occurred, clear out any temporaries that may have 6955 // been leftover. This ensures that these temporaries won't be picked up for 6956 // deletion in some later function. 6957 if (PP.getDiagnostics().hasErrorOccurred() || 6958 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6959 ExprTemporaries.clear(); 6960 ExprNeedsCleanups = false; 6961 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6962 // Since the body is valid, issue any analysis-based warnings that are 6963 // enabled. 6964 ActivePolicy = &WP; 6965 } 6966 6967 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 6968 !CheckConstexprFunctionBody(FD, Body)) 6969 FD->setInvalidDecl(); 6970 6971 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6972 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6973 } 6974 6975 if (!IsInstantiation) 6976 PopDeclContext(); 6977 6978 PopFunctionOrBlockScope(ActivePolicy, dcl); 6979 6980 // If any errors have occurred, clear out any temporaries that may have 6981 // been leftover. This ensures that these temporaries won't be picked up for 6982 // deletion in some later function. 6983 if (getDiagnostics().hasErrorOccurred()) { 6984 ExprTemporaries.clear(); 6985 ExprNeedsCleanups = false; 6986 } 6987 6988 return dcl; 6989} 6990 6991 6992/// When we finish delayed parsing of an attribute, we must attach it to the 6993/// relevant Decl. 6994void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6995 ParsedAttributes &Attrs) { 6996 ProcessDeclAttributeList(S, D, Attrs.getList()); 6997} 6998 6999 7000/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7001/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7002NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7003 IdentifierInfo &II, Scope *S) { 7004 // Before we produce a declaration for an implicitly defined 7005 // function, see whether there was a locally-scoped declaration of 7006 // this name as a function or variable. If so, use that 7007 // (non-visible) declaration, and complain about it. 7008 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7009 = findLocallyScopedExternalDecl(&II); 7010 if (Pos != LocallyScopedExternalDecls.end()) { 7011 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7012 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7013 return Pos->second; 7014 } 7015 7016 // Extension in C99. Legal in C90, but warn about it. 7017 if (II.getName().startswith("__builtin_")) 7018 Diag(Loc, diag::warn_builtin_unknown) << &II; 7019 else if (getLangOptions().C99) 7020 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7021 else 7022 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7023 7024 // Set a Declarator for the implicit definition: int foo(); 7025 const char *Dummy; 7026 AttributeFactory attrFactory; 7027 DeclSpec DS(attrFactory); 7028 unsigned DiagID; 7029 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7030 (void)Error; // Silence warning. 7031 assert(!Error && "Error setting up implicit decl!"); 7032 Declarator D(DS, Declarator::BlockContext); 7033 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7034 0, 0, true, SourceLocation(), 7035 SourceLocation(), 7036 EST_None, SourceLocation(), 7037 0, 0, 0, 0, Loc, Loc, D), 7038 DS.getAttributes(), 7039 SourceLocation()); 7040 D.SetIdentifier(&II, Loc); 7041 7042 // Insert this function into translation-unit scope. 7043 7044 DeclContext *PrevDC = CurContext; 7045 CurContext = Context.getTranslationUnitDecl(); 7046 7047 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7048 FD->setImplicit(); 7049 7050 CurContext = PrevDC; 7051 7052 AddKnownFunctionAttributes(FD); 7053 7054 return FD; 7055} 7056 7057/// \brief Adds any function attributes that we know a priori based on 7058/// the declaration of this function. 7059/// 7060/// These attributes can apply both to implicitly-declared builtins 7061/// (like __builtin___printf_chk) or to library-declared functions 7062/// like NSLog or printf. 7063/// 7064/// We need to check for duplicate attributes both here and where user-written 7065/// attributes are applied to declarations. 7066void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7067 if (FD->isInvalidDecl()) 7068 return; 7069 7070 // If this is a built-in function, map its builtin attributes to 7071 // actual attributes. 7072 if (unsigned BuiltinID = FD->getBuiltinID()) { 7073 // Handle printf-formatting attributes. 7074 unsigned FormatIdx; 7075 bool HasVAListArg; 7076 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7077 if (!FD->getAttr<FormatAttr>()) 7078 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7079 "printf", FormatIdx+1, 7080 HasVAListArg ? 0 : FormatIdx+2)); 7081 } 7082 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7083 HasVAListArg)) { 7084 if (!FD->getAttr<FormatAttr>()) 7085 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7086 "scanf", FormatIdx+1, 7087 HasVAListArg ? 0 : FormatIdx+2)); 7088 } 7089 7090 // Mark const if we don't care about errno and that is the only 7091 // thing preventing the function from being const. This allows 7092 // IRgen to use LLVM intrinsics for such functions. 7093 if (!getLangOptions().MathErrno && 7094 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7095 if (!FD->getAttr<ConstAttr>()) 7096 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7097 } 7098 7099 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7100 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7101 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7102 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7103 } 7104 7105 IdentifierInfo *Name = FD->getIdentifier(); 7106 if (!Name) 7107 return; 7108 if ((!getLangOptions().CPlusPlus && 7109 FD->getDeclContext()->isTranslationUnit()) || 7110 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7111 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7112 LinkageSpecDecl::lang_c)) { 7113 // Okay: this could be a libc/libm/Objective-C function we know 7114 // about. 7115 } else 7116 return; 7117 7118 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7119 // FIXME: NSLog and NSLogv should be target specific 7120 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7121 // FIXME: We known better than our headers. 7122 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7123 } else 7124 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7125 "printf", 1, 7126 Name->isStr("NSLogv") ? 0 : 2)); 7127 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7128 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7129 // target-specific builtins, perhaps? 7130 if (!FD->getAttr<FormatAttr>()) 7131 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7132 "printf", 2, 7133 Name->isStr("vasprintf") ? 0 : 3)); 7134 } 7135} 7136 7137TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7138 TypeSourceInfo *TInfo) { 7139 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7140 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7141 7142 if (!TInfo) { 7143 assert(D.isInvalidType() && "no declarator info for valid type"); 7144 TInfo = Context.getTrivialTypeSourceInfo(T); 7145 } 7146 7147 // Scope manipulation handled by caller. 7148 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7149 D.getSourceRange().getBegin(), 7150 D.getIdentifierLoc(), 7151 D.getIdentifier(), 7152 TInfo); 7153 7154 // Bail out immediately if we have an invalid declaration. 7155 if (D.isInvalidType()) { 7156 NewTD->setInvalidDecl(); 7157 return NewTD; 7158 } 7159 7160 if (D.getDeclSpec().isModulePrivateSpecified()) { 7161 if (CurContext->isFunctionOrMethod()) 7162 Diag(NewTD->getLocation(), diag::err_module_private_local) 7163 << 2 << NewTD->getDeclName() 7164 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7165 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7166 else 7167 NewTD->setModulePrivate(); 7168 } 7169 7170 // C++ [dcl.typedef]p8: 7171 // If the typedef declaration defines an unnamed class (or 7172 // enum), the first typedef-name declared by the declaration 7173 // to be that class type (or enum type) is used to denote the 7174 // class type (or enum type) for linkage purposes only. 7175 // We need to check whether the type was declared in the declaration. 7176 switch (D.getDeclSpec().getTypeSpecType()) { 7177 case TST_enum: 7178 case TST_struct: 7179 case TST_union: 7180 case TST_class: { 7181 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7182 7183 // Do nothing if the tag is not anonymous or already has an 7184 // associated typedef (from an earlier typedef in this decl group). 7185 if (tagFromDeclSpec->getIdentifier()) break; 7186 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7187 7188 // A well-formed anonymous tag must always be a TUK_Definition. 7189 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7190 7191 // The type must match the tag exactly; no qualifiers allowed. 7192 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7193 break; 7194 7195 // Otherwise, set this is the anon-decl typedef for the tag. 7196 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7197 break; 7198 } 7199 7200 default: 7201 break; 7202 } 7203 7204 return NewTD; 7205} 7206 7207 7208/// \brief Determine whether a tag with a given kind is acceptable 7209/// as a redeclaration of the given tag declaration. 7210/// 7211/// \returns true if the new tag kind is acceptable, false otherwise. 7212bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7213 TagTypeKind NewTag, bool isDefinition, 7214 SourceLocation NewTagLoc, 7215 const IdentifierInfo &Name) { 7216 // C++ [dcl.type.elab]p3: 7217 // The class-key or enum keyword present in the 7218 // elaborated-type-specifier shall agree in kind with the 7219 // declaration to which the name in the elaborated-type-specifier 7220 // refers. This rule also applies to the form of 7221 // elaborated-type-specifier that declares a class-name or 7222 // friend class since it can be construed as referring to the 7223 // definition of the class. Thus, in any 7224 // elaborated-type-specifier, the enum keyword shall be used to 7225 // refer to an enumeration (7.2), the union class-key shall be 7226 // used to refer to a union (clause 9), and either the class or 7227 // struct class-key shall be used to refer to a class (clause 9) 7228 // declared using the class or struct class-key. 7229 TagTypeKind OldTag = Previous->getTagKind(); 7230 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7231 if (OldTag == NewTag) 7232 return true; 7233 7234 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7235 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7236 // Warn about the struct/class tag mismatch. 7237 bool isTemplate = false; 7238 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7239 isTemplate = Record->getDescribedClassTemplate(); 7240 7241 if (!ActiveTemplateInstantiations.empty()) { 7242 // In a template instantiation, do not offer fix-its for tag mismatches 7243 // since they usually mess up the template instead of fixing the problem. 7244 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7245 << (NewTag == TTK_Class) << isTemplate << &Name; 7246 return true; 7247 } 7248 7249 if (isDefinition) { 7250 // On definitions, check previous tags and issue a fix-it for each 7251 // one that doesn't match the current tag. 7252 if (Previous->getDefinition()) { 7253 // Don't suggest fix-its for redefinitions. 7254 return true; 7255 } 7256 7257 bool previousMismatch = false; 7258 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7259 E(Previous->redecls_end()); I != E; ++I) { 7260 if (I->getTagKind() != NewTag) { 7261 if (!previousMismatch) { 7262 previousMismatch = true; 7263 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7264 << (NewTag == TTK_Class) << isTemplate << &Name; 7265 } 7266 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7267 << (NewTag == TTK_Class) 7268 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7269 NewTag == TTK_Class? 7270 "class" : "struct"); 7271 } 7272 } 7273 return true; 7274 } 7275 7276 // Check for a previous definition. If current tag and definition 7277 // are same type, do nothing. If no definition, but disagree with 7278 // with previous tag type, give a warning, but no fix-it. 7279 const TagDecl *Redecl = Previous->getDefinition() ? 7280 Previous->getDefinition() : Previous; 7281 if (Redecl->getTagKind() == NewTag) { 7282 return true; 7283 } 7284 7285 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7286 << (NewTag == TTK_Class) 7287 << isTemplate << &Name; 7288 Diag(Redecl->getLocation(), diag::note_previous_use); 7289 7290 // If there is a previous defintion, suggest a fix-it. 7291 if (Previous->getDefinition()) { 7292 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7293 << (Redecl->getTagKind() == TTK_Class) 7294 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7295 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7296 } 7297 7298 return true; 7299 } 7300 return false; 7301} 7302 7303/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7304/// former case, Name will be non-null. In the later case, Name will be null. 7305/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7306/// reference/declaration/definition of a tag. 7307Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7308 SourceLocation KWLoc, CXXScopeSpec &SS, 7309 IdentifierInfo *Name, SourceLocation NameLoc, 7310 AttributeList *Attr, AccessSpecifier AS, 7311 SourceLocation ModulePrivateLoc, 7312 MultiTemplateParamsArg TemplateParameterLists, 7313 bool &OwnedDecl, bool &IsDependent, 7314 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7315 TypeResult UnderlyingType) { 7316 // If this is not a definition, it must have a name. 7317 assert((Name != 0 || TUK == TUK_Definition) && 7318 "Nameless record must be a definition!"); 7319 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7320 7321 OwnedDecl = false; 7322 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7323 7324 // FIXME: Check explicit specializations more carefully. 7325 bool isExplicitSpecialization = false; 7326 bool Invalid = false; 7327 7328 // We only need to do this matching if we have template parameters 7329 // or a scope specifier, which also conveniently avoids this work 7330 // for non-C++ cases. 7331 if (TemplateParameterLists.size() > 0 || 7332 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7333 if (TemplateParameterList *TemplateParams 7334 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7335 TemplateParameterLists.get(), 7336 TemplateParameterLists.size(), 7337 TUK == TUK_Friend, 7338 isExplicitSpecialization, 7339 Invalid)) { 7340 if (TemplateParams->size() > 0) { 7341 // This is a declaration or definition of a class template (which may 7342 // be a member of another template). 7343 7344 if (Invalid) 7345 return 0; 7346 7347 OwnedDecl = false; 7348 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7349 SS, Name, NameLoc, Attr, 7350 TemplateParams, AS, 7351 ModulePrivateLoc, 7352 TemplateParameterLists.size() - 1, 7353 (TemplateParameterList**) TemplateParameterLists.release()); 7354 return Result.get(); 7355 } else { 7356 // The "template<>" header is extraneous. 7357 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7358 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7359 isExplicitSpecialization = true; 7360 } 7361 } 7362 } 7363 7364 // Figure out the underlying type if this a enum declaration. We need to do 7365 // this early, because it's needed to detect if this is an incompatible 7366 // redeclaration. 7367 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7368 7369 if (Kind == TTK_Enum) { 7370 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7371 // No underlying type explicitly specified, or we failed to parse the 7372 // type, default to int. 7373 EnumUnderlying = Context.IntTy.getTypePtr(); 7374 else if (UnderlyingType.get()) { 7375 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7376 // integral type; any cv-qualification is ignored. 7377 TypeSourceInfo *TI = 0; 7378 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7379 EnumUnderlying = TI; 7380 7381 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7382 7383 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7384 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7385 << T; 7386 // Recover by falling back to int. 7387 EnumUnderlying = Context.IntTy.getTypePtr(); 7388 } 7389 7390 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7391 UPPC_FixedUnderlyingType)) 7392 EnumUnderlying = Context.IntTy.getTypePtr(); 7393 7394 } else if (getLangOptions().MicrosoftExt) 7395 // Microsoft enums are always of int type. 7396 EnumUnderlying = Context.IntTy.getTypePtr(); 7397 } 7398 7399 DeclContext *SearchDC = CurContext; 7400 DeclContext *DC = CurContext; 7401 bool isStdBadAlloc = false; 7402 7403 RedeclarationKind Redecl = ForRedeclaration; 7404 if (TUK == TUK_Friend || TUK == TUK_Reference) 7405 Redecl = NotForRedeclaration; 7406 7407 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7408 7409 if (Name && SS.isNotEmpty()) { 7410 // We have a nested-name tag ('struct foo::bar'). 7411 7412 // Check for invalid 'foo::'. 7413 if (SS.isInvalid()) { 7414 Name = 0; 7415 goto CreateNewDecl; 7416 } 7417 7418 // If this is a friend or a reference to a class in a dependent 7419 // context, don't try to make a decl for it. 7420 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7421 DC = computeDeclContext(SS, false); 7422 if (!DC) { 7423 IsDependent = true; 7424 return 0; 7425 } 7426 } else { 7427 DC = computeDeclContext(SS, true); 7428 if (!DC) { 7429 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7430 << SS.getRange(); 7431 return 0; 7432 } 7433 } 7434 7435 if (RequireCompleteDeclContext(SS, DC)) 7436 return 0; 7437 7438 SearchDC = DC; 7439 // Look-up name inside 'foo::'. 7440 LookupQualifiedName(Previous, DC); 7441 7442 if (Previous.isAmbiguous()) 7443 return 0; 7444 7445 if (Previous.empty()) { 7446 // Name lookup did not find anything. However, if the 7447 // nested-name-specifier refers to the current instantiation, 7448 // and that current instantiation has any dependent base 7449 // classes, we might find something at instantiation time: treat 7450 // this as a dependent elaborated-type-specifier. 7451 // But this only makes any sense for reference-like lookups. 7452 if (Previous.wasNotFoundInCurrentInstantiation() && 7453 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7454 IsDependent = true; 7455 return 0; 7456 } 7457 7458 // A tag 'foo::bar' must already exist. 7459 Diag(NameLoc, diag::err_not_tag_in_scope) 7460 << Kind << Name << DC << SS.getRange(); 7461 Name = 0; 7462 Invalid = true; 7463 goto CreateNewDecl; 7464 } 7465 } else if (Name) { 7466 // If this is a named struct, check to see if there was a previous forward 7467 // declaration or definition. 7468 // FIXME: We're looking into outer scopes here, even when we 7469 // shouldn't be. Doing so can result in ambiguities that we 7470 // shouldn't be diagnosing. 7471 LookupName(Previous, S); 7472 7473 if (Previous.isAmbiguous() && 7474 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7475 LookupResult::Filter F = Previous.makeFilter(); 7476 while (F.hasNext()) { 7477 NamedDecl *ND = F.next(); 7478 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7479 F.erase(); 7480 } 7481 F.done(); 7482 } 7483 7484 // Note: there used to be some attempt at recovery here. 7485 if (Previous.isAmbiguous()) 7486 return 0; 7487 7488 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7489 // FIXME: This makes sure that we ignore the contexts associated 7490 // with C structs, unions, and enums when looking for a matching 7491 // tag declaration or definition. See the similar lookup tweak 7492 // in Sema::LookupName; is there a better way to deal with this? 7493 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7494 SearchDC = SearchDC->getParent(); 7495 } 7496 } else if (S->isFunctionPrototypeScope()) { 7497 // If this is an enum declaration in function prototype scope, set its 7498 // initial context to the translation unit. 7499 SearchDC = Context.getTranslationUnitDecl(); 7500 } 7501 7502 if (Previous.isSingleResult() && 7503 Previous.getFoundDecl()->isTemplateParameter()) { 7504 // Maybe we will complain about the shadowed template parameter. 7505 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7506 // Just pretend that we didn't see the previous declaration. 7507 Previous.clear(); 7508 } 7509 7510 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7511 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7512 // This is a declaration of or a reference to "std::bad_alloc". 7513 isStdBadAlloc = true; 7514 7515 if (Previous.empty() && StdBadAlloc) { 7516 // std::bad_alloc has been implicitly declared (but made invisible to 7517 // name lookup). Fill in this implicit declaration as the previous 7518 // declaration, so that the declarations get chained appropriately. 7519 Previous.addDecl(getStdBadAlloc()); 7520 } 7521 } 7522 7523 // If we didn't find a previous declaration, and this is a reference 7524 // (or friend reference), move to the correct scope. In C++, we 7525 // also need to do a redeclaration lookup there, just in case 7526 // there's a shadow friend decl. 7527 if (Name && Previous.empty() && 7528 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7529 if (Invalid) goto CreateNewDecl; 7530 assert(SS.isEmpty()); 7531 7532 if (TUK == TUK_Reference) { 7533 // C++ [basic.scope.pdecl]p5: 7534 // -- for an elaborated-type-specifier of the form 7535 // 7536 // class-key identifier 7537 // 7538 // if the elaborated-type-specifier is used in the 7539 // decl-specifier-seq or parameter-declaration-clause of a 7540 // function defined in namespace scope, the identifier is 7541 // declared as a class-name in the namespace that contains 7542 // the declaration; otherwise, except as a friend 7543 // declaration, the identifier is declared in the smallest 7544 // non-class, non-function-prototype scope that contains the 7545 // declaration. 7546 // 7547 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7548 // C structs and unions. 7549 // 7550 // It is an error in C++ to declare (rather than define) an enum 7551 // type, including via an elaborated type specifier. We'll 7552 // diagnose that later; for now, declare the enum in the same 7553 // scope as we would have picked for any other tag type. 7554 // 7555 // GNU C also supports this behavior as part of its incomplete 7556 // enum types extension, while GNU C++ does not. 7557 // 7558 // Find the context where we'll be declaring the tag. 7559 // FIXME: We would like to maintain the current DeclContext as the 7560 // lexical context, 7561 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7562 SearchDC = SearchDC->getParent(); 7563 7564 // Find the scope where we'll be declaring the tag. 7565 while (S->isClassScope() || 7566 (getLangOptions().CPlusPlus && 7567 S->isFunctionPrototypeScope()) || 7568 ((S->getFlags() & Scope::DeclScope) == 0) || 7569 (S->getEntity() && 7570 ((DeclContext *)S->getEntity())->isTransparentContext())) 7571 S = S->getParent(); 7572 } else { 7573 assert(TUK == TUK_Friend); 7574 // C++ [namespace.memdef]p3: 7575 // If a friend declaration in a non-local class first declares a 7576 // class or function, the friend class or function is a member of 7577 // the innermost enclosing namespace. 7578 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7579 } 7580 7581 // In C++, we need to do a redeclaration lookup to properly 7582 // diagnose some problems. 7583 if (getLangOptions().CPlusPlus) { 7584 Previous.setRedeclarationKind(ForRedeclaration); 7585 LookupQualifiedName(Previous, SearchDC); 7586 } 7587 } 7588 7589 if (!Previous.empty()) { 7590 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7591 7592 // It's okay to have a tag decl in the same scope as a typedef 7593 // which hides a tag decl in the same scope. Finding this 7594 // insanity with a redeclaration lookup can only actually happen 7595 // in C++. 7596 // 7597 // This is also okay for elaborated-type-specifiers, which is 7598 // technically forbidden by the current standard but which is 7599 // okay according to the likely resolution of an open issue; 7600 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7601 if (getLangOptions().CPlusPlus) { 7602 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7603 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7604 TagDecl *Tag = TT->getDecl(); 7605 if (Tag->getDeclName() == Name && 7606 Tag->getDeclContext()->getRedeclContext() 7607 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7608 PrevDecl = Tag; 7609 Previous.clear(); 7610 Previous.addDecl(Tag); 7611 Previous.resolveKind(); 7612 } 7613 } 7614 } 7615 } 7616 7617 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7618 // If this is a use of a previous tag, or if the tag is already declared 7619 // in the same scope (so that the definition/declaration completes or 7620 // rementions the tag), reuse the decl. 7621 if (TUK == TUK_Reference || TUK == TUK_Friend || 7622 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7623 // Make sure that this wasn't declared as an enum and now used as a 7624 // struct or something similar. 7625 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7626 TUK == TUK_Definition, KWLoc, 7627 *Name)) { 7628 bool SafeToContinue 7629 = (PrevTagDecl->getTagKind() != TTK_Enum && 7630 Kind != TTK_Enum); 7631 if (SafeToContinue) 7632 Diag(KWLoc, diag::err_use_with_wrong_tag) 7633 << Name 7634 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7635 PrevTagDecl->getKindName()); 7636 else 7637 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7638 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7639 7640 if (SafeToContinue) 7641 Kind = PrevTagDecl->getTagKind(); 7642 else { 7643 // Recover by making this an anonymous redefinition. 7644 Name = 0; 7645 Previous.clear(); 7646 Invalid = true; 7647 } 7648 } 7649 7650 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7651 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7652 7653 // All conflicts with previous declarations are recovered by 7654 // returning the previous declaration. 7655 if (ScopedEnum != PrevEnum->isScoped()) { 7656 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7657 << PrevEnum->isScoped(); 7658 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7659 return PrevTagDecl; 7660 } 7661 else if (EnumUnderlying && PrevEnum->isFixed()) { 7662 QualType T; 7663 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7664 T = TI->getType(); 7665 else 7666 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7667 7668 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7669 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7670 diag::err_enum_redeclare_type_mismatch) 7671 << T 7672 << PrevEnum->getIntegerType(); 7673 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7674 return PrevTagDecl; 7675 } 7676 } 7677 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7678 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7679 << PrevEnum->isFixed(); 7680 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7681 return PrevTagDecl; 7682 } 7683 } 7684 7685 if (!Invalid) { 7686 // If this is a use, just return the declaration we found. 7687 7688 // FIXME: In the future, return a variant or some other clue 7689 // for the consumer of this Decl to know it doesn't own it. 7690 // For our current ASTs this shouldn't be a problem, but will 7691 // need to be changed with DeclGroups. 7692 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7693 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7694 return PrevTagDecl; 7695 7696 // Diagnose attempts to redefine a tag. 7697 if (TUK == TUK_Definition) { 7698 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7699 // If we're defining a specialization and the previous definition 7700 // is from an implicit instantiation, don't emit an error 7701 // here; we'll catch this in the general case below. 7702 if (!isExplicitSpecialization || 7703 !isa<CXXRecordDecl>(Def) || 7704 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7705 == TSK_ExplicitSpecialization) { 7706 Diag(NameLoc, diag::err_redefinition) << Name; 7707 Diag(Def->getLocation(), diag::note_previous_definition); 7708 // If this is a redefinition, recover by making this 7709 // struct be anonymous, which will make any later 7710 // references get the previous definition. 7711 Name = 0; 7712 Previous.clear(); 7713 Invalid = true; 7714 } 7715 } else { 7716 // If the type is currently being defined, complain 7717 // about a nested redefinition. 7718 const TagType *Tag 7719 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7720 if (Tag->isBeingDefined()) { 7721 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7722 Diag(PrevTagDecl->getLocation(), 7723 diag::note_previous_definition); 7724 Name = 0; 7725 Previous.clear(); 7726 Invalid = true; 7727 } 7728 } 7729 7730 // Okay, this is definition of a previously declared or referenced 7731 // tag PrevDecl. We're going to create a new Decl for it. 7732 } 7733 } 7734 // If we get here we have (another) forward declaration or we 7735 // have a definition. Just create a new decl. 7736 7737 } else { 7738 // If we get here, this is a definition of a new tag type in a nested 7739 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7740 // new decl/type. We set PrevDecl to NULL so that the entities 7741 // have distinct types. 7742 Previous.clear(); 7743 } 7744 // If we get here, we're going to create a new Decl. If PrevDecl 7745 // is non-NULL, it's a definition of the tag declared by 7746 // PrevDecl. If it's NULL, we have a new definition. 7747 7748 7749 // Otherwise, PrevDecl is not a tag, but was found with tag 7750 // lookup. This is only actually possible in C++, where a few 7751 // things like templates still live in the tag namespace. 7752 } else { 7753 assert(getLangOptions().CPlusPlus); 7754 7755 // Use a better diagnostic if an elaborated-type-specifier 7756 // found the wrong kind of type on the first 7757 // (non-redeclaration) lookup. 7758 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7759 !Previous.isForRedeclaration()) { 7760 unsigned Kind = 0; 7761 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7762 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7763 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7764 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7765 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7766 Invalid = true; 7767 7768 // Otherwise, only diagnose if the declaration is in scope. 7769 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7770 isExplicitSpecialization)) { 7771 // do nothing 7772 7773 // Diagnose implicit declarations introduced by elaborated types. 7774 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7775 unsigned Kind = 0; 7776 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7777 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7778 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7779 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7780 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7781 Invalid = true; 7782 7783 // Otherwise it's a declaration. Call out a particularly common 7784 // case here. 7785 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7786 unsigned Kind = 0; 7787 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7788 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7789 << Name << Kind << TND->getUnderlyingType(); 7790 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7791 Invalid = true; 7792 7793 // Otherwise, diagnose. 7794 } else { 7795 // The tag name clashes with something else in the target scope, 7796 // issue an error and recover by making this tag be anonymous. 7797 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7798 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7799 Name = 0; 7800 Invalid = true; 7801 } 7802 7803 // The existing declaration isn't relevant to us; we're in a 7804 // new scope, so clear out the previous declaration. 7805 Previous.clear(); 7806 } 7807 } 7808 7809CreateNewDecl: 7810 7811 TagDecl *PrevDecl = 0; 7812 if (Previous.isSingleResult()) 7813 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7814 7815 // If there is an identifier, use the location of the identifier as the 7816 // location of the decl, otherwise use the location of the struct/union 7817 // keyword. 7818 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7819 7820 // Otherwise, create a new declaration. If there is a previous 7821 // declaration of the same entity, the two will be linked via 7822 // PrevDecl. 7823 TagDecl *New; 7824 7825 bool IsForwardReference = false; 7826 if (Kind == TTK_Enum) { 7827 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7828 // enum X { A, B, C } D; D should chain to X. 7829 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7830 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7831 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7832 // If this is an undefined enum, warn. 7833 if (TUK != TUK_Definition && !Invalid) { 7834 TagDecl *Def; 7835 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7836 // C++0x: 7.2p2: opaque-enum-declaration. 7837 // Conflicts are diagnosed above. Do nothing. 7838 } 7839 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7840 Diag(Loc, diag::ext_forward_ref_enum_def) 7841 << New; 7842 Diag(Def->getLocation(), diag::note_previous_definition); 7843 } else { 7844 unsigned DiagID = diag::ext_forward_ref_enum; 7845 if (getLangOptions().MicrosoftExt) 7846 DiagID = diag::ext_ms_forward_ref_enum; 7847 else if (getLangOptions().CPlusPlus) 7848 DiagID = diag::err_forward_ref_enum; 7849 Diag(Loc, DiagID); 7850 7851 // If this is a forward-declared reference to an enumeration, make a 7852 // note of it; we won't actually be introducing the declaration into 7853 // the declaration context. 7854 if (TUK == TUK_Reference) 7855 IsForwardReference = true; 7856 } 7857 } 7858 7859 if (EnumUnderlying) { 7860 EnumDecl *ED = cast<EnumDecl>(New); 7861 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7862 ED->setIntegerTypeSourceInfo(TI); 7863 else 7864 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7865 ED->setPromotionType(ED->getIntegerType()); 7866 } 7867 7868 } else { 7869 // struct/union/class 7870 7871 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7872 // struct X { int A; } D; D should chain to X. 7873 if (getLangOptions().CPlusPlus) { 7874 // FIXME: Look for a way to use RecordDecl for simple structs. 7875 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7876 cast_or_null<CXXRecordDecl>(PrevDecl)); 7877 7878 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7879 StdBadAlloc = cast<CXXRecordDecl>(New); 7880 } else 7881 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7882 cast_or_null<RecordDecl>(PrevDecl)); 7883 } 7884 7885 // Maybe add qualifier info. 7886 if (SS.isNotEmpty()) { 7887 if (SS.isSet()) { 7888 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7889 if (TemplateParameterLists.size() > 0) { 7890 New->setTemplateParameterListsInfo(Context, 7891 TemplateParameterLists.size(), 7892 (TemplateParameterList**) TemplateParameterLists.release()); 7893 } 7894 } 7895 else 7896 Invalid = true; 7897 } 7898 7899 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7900 // Add alignment attributes if necessary; these attributes are checked when 7901 // the ASTContext lays out the structure. 7902 // 7903 // It is important for implementing the correct semantics that this 7904 // happen here (in act on tag decl). The #pragma pack stack is 7905 // maintained as a result of parser callbacks which can occur at 7906 // many points during the parsing of a struct declaration (because 7907 // the #pragma tokens are effectively skipped over during the 7908 // parsing of the struct). 7909 AddAlignmentAttributesForRecord(RD); 7910 7911 AddMsStructLayoutForRecord(RD); 7912 } 7913 7914 if (PrevDecl && PrevDecl->isModulePrivate()) 7915 New->setModulePrivate(); 7916 else if (ModulePrivateLoc.isValid()) { 7917 if (isExplicitSpecialization) 7918 Diag(New->getLocation(), diag::err_module_private_specialization) 7919 << 2 7920 << FixItHint::CreateRemoval(ModulePrivateLoc); 7921 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7922 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7923 // __module_private__ does not apply to local classes. However, we only 7924 // diagnose this as an error when the declaration specifiers are 7925 // freestanding. Here, we just ignore the __module_private__. 7926 // foobar 7927 else if (!SearchDC->isFunctionOrMethod()) 7928 New->setModulePrivate(); 7929 } 7930 7931 // If this is a specialization of a member class (of a class template), 7932 // check the specialization. 7933 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7934 Invalid = true; 7935 7936 if (Invalid) 7937 New->setInvalidDecl(); 7938 7939 if (Attr) 7940 ProcessDeclAttributeList(S, New, Attr); 7941 7942 // If we're declaring or defining a tag in function prototype scope 7943 // in C, note that this type can only be used within the function. 7944 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7945 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7946 7947 // Set the lexical context. If the tag has a C++ scope specifier, the 7948 // lexical context will be different from the semantic context. 7949 New->setLexicalDeclContext(CurContext); 7950 7951 // Mark this as a friend decl if applicable. 7952 // In Microsoft mode, a friend declaration also acts as a forward 7953 // declaration so we always pass true to setObjectOfFriendDecl to make 7954 // the tag name visible. 7955 if (TUK == TUK_Friend) 7956 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7957 getLangOptions().MicrosoftExt); 7958 7959 // Set the access specifier. 7960 if (!Invalid && SearchDC->isRecord()) 7961 SetMemberAccessSpecifier(New, PrevDecl, AS); 7962 7963 if (TUK == TUK_Definition) 7964 New->startDefinition(); 7965 7966 // If this has an identifier, add it to the scope stack. 7967 if (TUK == TUK_Friend) { 7968 // We might be replacing an existing declaration in the lookup tables; 7969 // if so, borrow its access specifier. 7970 if (PrevDecl) 7971 New->setAccess(PrevDecl->getAccess()); 7972 7973 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7974 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7975 if (Name) // can be null along some error paths 7976 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7977 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7978 } else if (Name) { 7979 S = getNonFieldDeclScope(S); 7980 PushOnScopeChains(New, S, !IsForwardReference); 7981 if (IsForwardReference) 7982 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7983 7984 } else { 7985 CurContext->addDecl(New); 7986 } 7987 7988 // If this is the C FILE type, notify the AST context. 7989 if (IdentifierInfo *II = New->getIdentifier()) 7990 if (!New->isInvalidDecl() && 7991 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7992 II->isStr("FILE")) 7993 Context.setFILEDecl(New); 7994 7995 OwnedDecl = true; 7996 return New; 7997} 7998 7999void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8000 AdjustDeclIfTemplate(TagD); 8001 TagDecl *Tag = cast<TagDecl>(TagD); 8002 8003 // Enter the tag context. 8004 PushDeclContext(S, Tag); 8005} 8006 8007Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8008 assert(isa<ObjCContainerDecl>(IDecl) && 8009 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8010 DeclContext *OCD = cast<DeclContext>(IDecl); 8011 assert(getContainingDC(OCD) == CurContext && 8012 "The next DeclContext should be lexically contained in the current one."); 8013 CurContext = OCD; 8014 return IDecl; 8015} 8016 8017void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8018 SourceLocation FinalLoc, 8019 SourceLocation LBraceLoc) { 8020 AdjustDeclIfTemplate(TagD); 8021 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8022 8023 FieldCollector->StartClass(); 8024 8025 if (!Record->getIdentifier()) 8026 return; 8027 8028 if (FinalLoc.isValid()) 8029 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8030 8031 // C++ [class]p2: 8032 // [...] The class-name is also inserted into the scope of the 8033 // class itself; this is known as the injected-class-name. For 8034 // purposes of access checking, the injected-class-name is treated 8035 // as if it were a public member name. 8036 CXXRecordDecl *InjectedClassName 8037 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8038 Record->getLocStart(), Record->getLocation(), 8039 Record->getIdentifier(), 8040 /*PrevDecl=*/0, 8041 /*DelayTypeCreation=*/true); 8042 Context.getTypeDeclType(InjectedClassName, Record); 8043 InjectedClassName->setImplicit(); 8044 InjectedClassName->setAccess(AS_public); 8045 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8046 InjectedClassName->setDescribedClassTemplate(Template); 8047 PushOnScopeChains(InjectedClassName, S); 8048 assert(InjectedClassName->isInjectedClassName() && 8049 "Broken injected-class-name"); 8050} 8051 8052void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8053 SourceLocation RBraceLoc) { 8054 AdjustDeclIfTemplate(TagD); 8055 TagDecl *Tag = cast<TagDecl>(TagD); 8056 Tag->setRBraceLoc(RBraceLoc); 8057 8058 if (isa<CXXRecordDecl>(Tag)) 8059 FieldCollector->FinishClass(); 8060 8061 // Exit this scope of this tag's definition. 8062 PopDeclContext(); 8063 8064 // Notify the consumer that we've defined a tag. 8065 Consumer.HandleTagDeclDefinition(Tag); 8066} 8067 8068void Sema::ActOnObjCContainerFinishDefinition() { 8069 // Exit this scope of this interface definition. 8070 PopDeclContext(); 8071} 8072 8073void Sema::ActOnObjCTemporaryExitContainerContext() { 8074 OriginalLexicalContext = CurContext; 8075 ActOnObjCContainerFinishDefinition(); 8076} 8077 8078void Sema::ActOnObjCReenterContainerContext() { 8079 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8080 OriginalLexicalContext = 0; 8081} 8082 8083void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8084 AdjustDeclIfTemplate(TagD); 8085 TagDecl *Tag = cast<TagDecl>(TagD); 8086 Tag->setInvalidDecl(); 8087 8088 // We're undoing ActOnTagStartDefinition here, not 8089 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8090 // the FieldCollector. 8091 8092 PopDeclContext(); 8093} 8094 8095// Note that FieldName may be null for anonymous bitfields. 8096bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8097 QualType FieldTy, const Expr *BitWidth, 8098 bool *ZeroWidth) { 8099 // Default to true; that shouldn't confuse checks for emptiness 8100 if (ZeroWidth) 8101 *ZeroWidth = true; 8102 8103 // C99 6.7.2.1p4 - verify the field type. 8104 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8105 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8106 // Handle incomplete types with specific error. 8107 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8108 return true; 8109 if (FieldName) 8110 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8111 << FieldName << FieldTy << BitWidth->getSourceRange(); 8112 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8113 << FieldTy << BitWidth->getSourceRange(); 8114 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8115 UPPC_BitFieldWidth)) 8116 return true; 8117 8118 // If the bit-width is type- or value-dependent, don't try to check 8119 // it now. 8120 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8121 return false; 8122 8123 llvm::APSInt Value; 8124 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8125 return true; 8126 8127 if (Value != 0 && ZeroWidth) 8128 *ZeroWidth = false; 8129 8130 // Zero-width bitfield is ok for anonymous field. 8131 if (Value == 0 && FieldName) 8132 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8133 8134 if (Value.isSigned() && Value.isNegative()) { 8135 if (FieldName) 8136 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8137 << FieldName << Value.toString(10); 8138 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8139 << Value.toString(10); 8140 } 8141 8142 if (!FieldTy->isDependentType()) { 8143 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8144 if (Value.getZExtValue() > TypeSize) { 8145 if (!getLangOptions().CPlusPlus) { 8146 if (FieldName) 8147 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8148 << FieldName << (unsigned)Value.getZExtValue() 8149 << (unsigned)TypeSize; 8150 8151 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8152 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8153 } 8154 8155 if (FieldName) 8156 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8157 << FieldName << (unsigned)Value.getZExtValue() 8158 << (unsigned)TypeSize; 8159 else 8160 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8161 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8162 } 8163 } 8164 8165 return false; 8166} 8167 8168/// ActOnField - Each field of a C struct/union is passed into this in order 8169/// to create a FieldDecl object for it. 8170Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8171 Declarator &D, Expr *BitfieldWidth) { 8172 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8173 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8174 /*HasInit=*/false, AS_public); 8175 return Res; 8176} 8177 8178/// HandleField - Analyze a field of a C struct or a C++ data member. 8179/// 8180FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8181 SourceLocation DeclStart, 8182 Declarator &D, Expr *BitWidth, bool HasInit, 8183 AccessSpecifier AS) { 8184 IdentifierInfo *II = D.getIdentifier(); 8185 SourceLocation Loc = DeclStart; 8186 if (II) Loc = D.getIdentifierLoc(); 8187 8188 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8189 QualType T = TInfo->getType(); 8190 if (getLangOptions().CPlusPlus) { 8191 CheckExtraCXXDefaultArguments(D); 8192 8193 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8194 UPPC_DataMemberType)) { 8195 D.setInvalidType(); 8196 T = Context.IntTy; 8197 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8198 } 8199 } 8200 8201 DiagnoseFunctionSpecifiers(D); 8202 8203 if (D.getDeclSpec().isThreadSpecified()) 8204 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8205 if (D.getDeclSpec().isConstexprSpecified()) 8206 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8207 << 2; 8208 8209 // Check to see if this name was declared as a member previously 8210 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8211 LookupName(Previous, S); 8212 assert((Previous.empty() || Previous.isOverloadedResult() || 8213 Previous.isSingleResult()) 8214 && "Lookup of member name should be either overloaded, single or null"); 8215 8216 // If the name is overloaded then get any declaration else get the single result 8217 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8218 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8219 8220 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8221 // Maybe we will complain about the shadowed template parameter. 8222 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8223 // Just pretend that we didn't see the previous declaration. 8224 PrevDecl = 0; 8225 } 8226 8227 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8228 PrevDecl = 0; 8229 8230 bool Mutable 8231 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8232 SourceLocation TSSL = D.getSourceRange().getBegin(); 8233 FieldDecl *NewFD 8234 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8235 TSSL, AS, PrevDecl, &D); 8236 8237 if (NewFD->isInvalidDecl()) 8238 Record->setInvalidDecl(); 8239 8240 if (D.getDeclSpec().isModulePrivateSpecified()) 8241 NewFD->setModulePrivate(); 8242 8243 if (NewFD->isInvalidDecl() && PrevDecl) { 8244 // Don't introduce NewFD into scope; there's already something 8245 // with the same name in the same scope. 8246 } else if (II) { 8247 PushOnScopeChains(NewFD, S); 8248 } else 8249 Record->addDecl(NewFD); 8250 8251 return NewFD; 8252} 8253 8254/// \brief Build a new FieldDecl and check its well-formedness. 8255/// 8256/// This routine builds a new FieldDecl given the fields name, type, 8257/// record, etc. \p PrevDecl should refer to any previous declaration 8258/// with the same name and in the same scope as the field to be 8259/// created. 8260/// 8261/// \returns a new FieldDecl. 8262/// 8263/// \todo The Declarator argument is a hack. It will be removed once 8264FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8265 TypeSourceInfo *TInfo, 8266 RecordDecl *Record, SourceLocation Loc, 8267 bool Mutable, Expr *BitWidth, bool HasInit, 8268 SourceLocation TSSL, 8269 AccessSpecifier AS, NamedDecl *PrevDecl, 8270 Declarator *D) { 8271 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8272 bool InvalidDecl = false; 8273 if (D) InvalidDecl = D->isInvalidType(); 8274 8275 // If we receive a broken type, recover by assuming 'int' and 8276 // marking this declaration as invalid. 8277 if (T.isNull()) { 8278 InvalidDecl = true; 8279 T = Context.IntTy; 8280 } 8281 8282 QualType EltTy = Context.getBaseElementType(T); 8283 if (!EltTy->isDependentType() && 8284 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8285 // Fields of incomplete type force their record to be invalid. 8286 Record->setInvalidDecl(); 8287 InvalidDecl = true; 8288 } 8289 8290 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8291 // than a variably modified type. 8292 if (!InvalidDecl && T->isVariablyModifiedType()) { 8293 bool SizeIsNegative; 8294 llvm::APSInt Oversized; 8295 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8296 SizeIsNegative, 8297 Oversized); 8298 if (!FixedTy.isNull()) { 8299 Diag(Loc, diag::warn_illegal_constant_array_size); 8300 T = FixedTy; 8301 } else { 8302 if (SizeIsNegative) 8303 Diag(Loc, diag::err_typecheck_negative_array_size); 8304 else if (Oversized.getBoolValue()) 8305 Diag(Loc, diag::err_array_too_large) 8306 << Oversized.toString(10); 8307 else 8308 Diag(Loc, diag::err_typecheck_field_variable_size); 8309 InvalidDecl = true; 8310 } 8311 } 8312 8313 // Fields can not have abstract class types 8314 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8315 diag::err_abstract_type_in_decl, 8316 AbstractFieldType)) 8317 InvalidDecl = true; 8318 8319 bool ZeroWidth = false; 8320 // If this is declared as a bit-field, check the bit-field. 8321 if (!InvalidDecl && BitWidth && 8322 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8323 InvalidDecl = true; 8324 BitWidth = 0; 8325 ZeroWidth = false; 8326 } 8327 8328 // Check that 'mutable' is consistent with the type of the declaration. 8329 if (!InvalidDecl && Mutable) { 8330 unsigned DiagID = 0; 8331 if (T->isReferenceType()) 8332 DiagID = diag::err_mutable_reference; 8333 else if (T.isConstQualified()) 8334 DiagID = diag::err_mutable_const; 8335 8336 if (DiagID) { 8337 SourceLocation ErrLoc = Loc; 8338 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8339 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8340 Diag(ErrLoc, DiagID); 8341 Mutable = false; 8342 InvalidDecl = true; 8343 } 8344 } 8345 8346 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8347 BitWidth, Mutable, HasInit); 8348 if (InvalidDecl) 8349 NewFD->setInvalidDecl(); 8350 8351 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8352 Diag(Loc, diag::err_duplicate_member) << II; 8353 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8354 NewFD->setInvalidDecl(); 8355 } 8356 8357 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8358 if (Record->isUnion()) { 8359 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8360 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8361 if (RDecl->getDefinition()) { 8362 // C++ [class.union]p1: An object of a class with a non-trivial 8363 // constructor, a non-trivial copy constructor, a non-trivial 8364 // destructor, or a non-trivial copy assignment operator 8365 // cannot be a member of a union, nor can an array of such 8366 // objects. 8367 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8368 NewFD->setInvalidDecl(); 8369 } 8370 } 8371 8372 // C++ [class.union]p1: If a union contains a member of reference type, 8373 // the program is ill-formed. 8374 if (EltTy->isReferenceType()) { 8375 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8376 << NewFD->getDeclName() << EltTy; 8377 NewFD->setInvalidDecl(); 8378 } 8379 } 8380 } 8381 8382 // FIXME: We need to pass in the attributes given an AST 8383 // representation, not a parser representation. 8384 if (D) 8385 // FIXME: What to pass instead of TUScope? 8386 ProcessDeclAttributes(TUScope, NewFD, *D); 8387 8388 // In auto-retain/release, infer strong retension for fields of 8389 // retainable type. 8390 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8391 NewFD->setInvalidDecl(); 8392 8393 if (T.isObjCGCWeak()) 8394 Diag(Loc, diag::warn_attribute_weak_on_field); 8395 8396 NewFD->setAccess(AS); 8397 return NewFD; 8398} 8399 8400bool Sema::CheckNontrivialField(FieldDecl *FD) { 8401 assert(FD); 8402 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8403 8404 if (FD->isInvalidDecl()) 8405 return true; 8406 8407 QualType EltTy = Context.getBaseElementType(FD->getType()); 8408 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8409 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8410 if (RDecl->getDefinition()) { 8411 // We check for copy constructors before constructors 8412 // because otherwise we'll never get complaints about 8413 // copy constructors. 8414 8415 CXXSpecialMember member = CXXInvalid; 8416 if (!RDecl->hasTrivialCopyConstructor()) 8417 member = CXXCopyConstructor; 8418 else if (!RDecl->hasTrivialDefaultConstructor()) 8419 member = CXXDefaultConstructor; 8420 else if (!RDecl->hasTrivialCopyAssignment()) 8421 member = CXXCopyAssignment; 8422 else if (!RDecl->hasTrivialDestructor()) 8423 member = CXXDestructor; 8424 8425 if (member != CXXInvalid) { 8426 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8427 // Objective-C++ ARC: it is an error to have a non-trivial field of 8428 // a union. However, system headers in Objective-C programs 8429 // occasionally have Objective-C lifetime objects within unions, 8430 // and rather than cause the program to fail, we make those 8431 // members unavailable. 8432 SourceLocation Loc = FD->getLocation(); 8433 if (getSourceManager().isInSystemHeader(Loc)) { 8434 if (!FD->hasAttr<UnavailableAttr>()) 8435 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8436 "this system field has retaining ownership")); 8437 return false; 8438 } 8439 } 8440 8441 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8442 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8443 DiagnoseNontrivial(RT, member); 8444 return true; 8445 } 8446 } 8447 } 8448 8449 return false; 8450} 8451 8452/// DiagnoseNontrivial - Given that a class has a non-trivial 8453/// special member, figure out why. 8454void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8455 QualType QT(T, 0U); 8456 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8457 8458 // Check whether the member was user-declared. 8459 switch (member) { 8460 case CXXInvalid: 8461 break; 8462 8463 case CXXDefaultConstructor: 8464 if (RD->hasUserDeclaredConstructor()) { 8465 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8466 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8467 const FunctionDecl *body = 0; 8468 ci->hasBody(body); 8469 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8470 SourceLocation CtorLoc = ci->getLocation(); 8471 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8472 return; 8473 } 8474 } 8475 8476 llvm_unreachable("found no user-declared constructors"); 8477 } 8478 break; 8479 8480 case CXXCopyConstructor: 8481 if (RD->hasUserDeclaredCopyConstructor()) { 8482 SourceLocation CtorLoc = 8483 RD->getCopyConstructor(0)->getLocation(); 8484 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8485 return; 8486 } 8487 break; 8488 8489 case CXXMoveConstructor: 8490 if (RD->hasUserDeclaredMoveConstructor()) { 8491 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8492 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8493 return; 8494 } 8495 break; 8496 8497 case CXXCopyAssignment: 8498 if (RD->hasUserDeclaredCopyAssignment()) { 8499 // FIXME: this should use the location of the copy 8500 // assignment, not the type. 8501 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8502 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8503 return; 8504 } 8505 break; 8506 8507 case CXXMoveAssignment: 8508 if (RD->hasUserDeclaredMoveAssignment()) { 8509 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8510 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8511 return; 8512 } 8513 break; 8514 8515 case CXXDestructor: 8516 if (RD->hasUserDeclaredDestructor()) { 8517 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8518 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8519 return; 8520 } 8521 break; 8522 } 8523 8524 typedef CXXRecordDecl::base_class_iterator base_iter; 8525 8526 // Virtual bases and members inhibit trivial copying/construction, 8527 // but not trivial destruction. 8528 if (member != CXXDestructor) { 8529 // Check for virtual bases. vbases includes indirect virtual bases, 8530 // so we just iterate through the direct bases. 8531 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8532 if (bi->isVirtual()) { 8533 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8534 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8535 return; 8536 } 8537 8538 // Check for virtual methods. 8539 typedef CXXRecordDecl::method_iterator meth_iter; 8540 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8541 ++mi) { 8542 if (mi->isVirtual()) { 8543 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8544 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8545 return; 8546 } 8547 } 8548 } 8549 8550 bool (CXXRecordDecl::*hasTrivial)() const; 8551 switch (member) { 8552 case CXXDefaultConstructor: 8553 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8554 case CXXCopyConstructor: 8555 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8556 case CXXCopyAssignment: 8557 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8558 case CXXDestructor: 8559 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8560 default: 8561 llvm_unreachable("unexpected special member"); 8562 } 8563 8564 // Check for nontrivial bases (and recurse). 8565 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8566 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8567 assert(BaseRT && "Don't know how to handle dependent bases"); 8568 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8569 if (!(BaseRecTy->*hasTrivial)()) { 8570 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8571 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8572 DiagnoseNontrivial(BaseRT, member); 8573 return; 8574 } 8575 } 8576 8577 // Check for nontrivial members (and recurse). 8578 typedef RecordDecl::field_iterator field_iter; 8579 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8580 ++fi) { 8581 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8582 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8583 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8584 8585 if (!(EltRD->*hasTrivial)()) { 8586 SourceLocation FLoc = (*fi)->getLocation(); 8587 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8588 DiagnoseNontrivial(EltRT, member); 8589 return; 8590 } 8591 } 8592 8593 if (EltTy->isObjCLifetimeType()) { 8594 switch (EltTy.getObjCLifetime()) { 8595 case Qualifiers::OCL_None: 8596 case Qualifiers::OCL_ExplicitNone: 8597 break; 8598 8599 case Qualifiers::OCL_Autoreleasing: 8600 case Qualifiers::OCL_Weak: 8601 case Qualifiers::OCL_Strong: 8602 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8603 << QT << EltTy.getObjCLifetime(); 8604 return; 8605 } 8606 } 8607 } 8608 8609 llvm_unreachable("found no explanation for non-trivial member"); 8610} 8611 8612/// TranslateIvarVisibility - Translate visibility from a token ID to an 8613/// AST enum value. 8614static ObjCIvarDecl::AccessControl 8615TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8616 switch (ivarVisibility) { 8617 default: llvm_unreachable("Unknown visitibility kind"); 8618 case tok::objc_private: return ObjCIvarDecl::Private; 8619 case tok::objc_public: return ObjCIvarDecl::Public; 8620 case tok::objc_protected: return ObjCIvarDecl::Protected; 8621 case tok::objc_package: return ObjCIvarDecl::Package; 8622 } 8623} 8624 8625/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8626/// in order to create an IvarDecl object for it. 8627Decl *Sema::ActOnIvar(Scope *S, 8628 SourceLocation DeclStart, 8629 Declarator &D, Expr *BitfieldWidth, 8630 tok::ObjCKeywordKind Visibility) { 8631 8632 IdentifierInfo *II = D.getIdentifier(); 8633 Expr *BitWidth = (Expr*)BitfieldWidth; 8634 SourceLocation Loc = DeclStart; 8635 if (II) Loc = D.getIdentifierLoc(); 8636 8637 // FIXME: Unnamed fields can be handled in various different ways, for 8638 // example, unnamed unions inject all members into the struct namespace! 8639 8640 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8641 QualType T = TInfo->getType(); 8642 8643 if (BitWidth) { 8644 // 6.7.2.1p3, 6.7.2.1p4 8645 if (VerifyBitField(Loc, II, T, BitWidth)) { 8646 D.setInvalidType(); 8647 BitWidth = 0; 8648 } 8649 } else { 8650 // Not a bitfield. 8651 8652 // validate II. 8653 8654 } 8655 if (T->isReferenceType()) { 8656 Diag(Loc, diag::err_ivar_reference_type); 8657 D.setInvalidType(); 8658 } 8659 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8660 // than a variably modified type. 8661 else if (T->isVariablyModifiedType()) { 8662 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8663 D.setInvalidType(); 8664 } 8665 8666 // Get the visibility (access control) for this ivar. 8667 ObjCIvarDecl::AccessControl ac = 8668 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8669 : ObjCIvarDecl::None; 8670 // Must set ivar's DeclContext to its enclosing interface. 8671 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8672 ObjCContainerDecl *EnclosingContext; 8673 if (ObjCImplementationDecl *IMPDecl = 8674 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8675 if (!LangOpts.ObjCNonFragileABI2) { 8676 // Case of ivar declared in an implementation. Context is that of its class. 8677 EnclosingContext = IMPDecl->getClassInterface(); 8678 assert(EnclosingContext && "Implementation has no class interface!"); 8679 } 8680 else 8681 EnclosingContext = EnclosingDecl; 8682 } else { 8683 if (ObjCCategoryDecl *CDecl = 8684 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8685 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8686 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8687 return 0; 8688 } 8689 } 8690 EnclosingContext = EnclosingDecl; 8691 } 8692 8693 // Construct the decl. 8694 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8695 DeclStart, Loc, II, T, 8696 TInfo, ac, (Expr *)BitfieldWidth); 8697 8698 if (II) { 8699 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8700 ForRedeclaration); 8701 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8702 && !isa<TagDecl>(PrevDecl)) { 8703 Diag(Loc, diag::err_duplicate_member) << II; 8704 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8705 NewID->setInvalidDecl(); 8706 } 8707 } 8708 8709 // Process attributes attached to the ivar. 8710 ProcessDeclAttributes(S, NewID, D); 8711 8712 if (D.isInvalidType()) 8713 NewID->setInvalidDecl(); 8714 8715 // In ARC, infer 'retaining' for ivars of retainable type. 8716 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8717 NewID->setInvalidDecl(); 8718 8719 if (D.getDeclSpec().isModulePrivateSpecified()) 8720 NewID->setModulePrivate(); 8721 8722 if (II) { 8723 // FIXME: When interfaces are DeclContexts, we'll need to add 8724 // these to the interface. 8725 S->AddDecl(NewID); 8726 IdResolver.AddDecl(NewID); 8727 } 8728 8729 return NewID; 8730} 8731 8732/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8733/// class and class extensions. For every class @interface and class 8734/// extension @interface, if the last ivar is a bitfield of any type, 8735/// then add an implicit `char :0` ivar to the end of that interface. 8736void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8737 SmallVectorImpl<Decl *> &AllIvarDecls) { 8738 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8739 return; 8740 8741 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8742 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8743 8744 if (!Ivar->isBitField()) 8745 return; 8746 uint64_t BitFieldSize = 8747 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8748 if (BitFieldSize == 0) 8749 return; 8750 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8751 if (!ID) { 8752 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8753 if (!CD->IsClassExtension()) 8754 return; 8755 } 8756 // No need to add this to end of @implementation. 8757 else 8758 return; 8759 } 8760 // All conditions are met. Add a new bitfield to the tail end of ivars. 8761 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8762 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8763 8764 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8765 DeclLoc, DeclLoc, 0, 8766 Context.CharTy, 8767 Context.getTrivialTypeSourceInfo(Context.CharTy, 8768 DeclLoc), 8769 ObjCIvarDecl::Private, BW, 8770 true); 8771 AllIvarDecls.push_back(Ivar); 8772} 8773 8774void Sema::ActOnFields(Scope* S, 8775 SourceLocation RecLoc, Decl *EnclosingDecl, 8776 llvm::ArrayRef<Decl *> Fields, 8777 SourceLocation LBrac, SourceLocation RBrac, 8778 AttributeList *Attr) { 8779 assert(EnclosingDecl && "missing record or interface decl"); 8780 8781 // If the decl this is being inserted into is invalid, then it may be a 8782 // redeclaration or some other bogus case. Don't try to add fields to it. 8783 if (EnclosingDecl->isInvalidDecl()) 8784 return; 8785 8786 // Verify that all the fields are okay. 8787 unsigned NumNamedMembers = 0; 8788 SmallVector<FieldDecl*, 32> RecFields; 8789 8790 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8791 bool ARCErrReported = false; 8792 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8793 i != end; ++i) { 8794 FieldDecl *FD = cast<FieldDecl>(*i); 8795 8796 // Get the type for the field. 8797 const Type *FDTy = FD->getType().getTypePtr(); 8798 8799 if (!FD->isAnonymousStructOrUnion()) { 8800 // Remember all fields written by the user. 8801 RecFields.push_back(FD); 8802 } 8803 8804 // If the field is already invalid for some reason, don't emit more 8805 // diagnostics about it. 8806 if (FD->isInvalidDecl()) { 8807 EnclosingDecl->setInvalidDecl(); 8808 continue; 8809 } 8810 8811 // C99 6.7.2.1p2: 8812 // A structure or union shall not contain a member with 8813 // incomplete or function type (hence, a structure shall not 8814 // contain an instance of itself, but may contain a pointer to 8815 // an instance of itself), except that the last member of a 8816 // structure with more than one named member may have incomplete 8817 // array type; such a structure (and any union containing, 8818 // possibly recursively, a member that is such a structure) 8819 // shall not be a member of a structure or an element of an 8820 // array. 8821 if (FDTy->isFunctionType()) { 8822 // Field declared as a function. 8823 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8824 << FD->getDeclName(); 8825 FD->setInvalidDecl(); 8826 EnclosingDecl->setInvalidDecl(); 8827 continue; 8828 } else if (FDTy->isIncompleteArrayType() && Record && 8829 ((i + 1 == Fields.end() && !Record->isUnion()) || 8830 ((getLangOptions().MicrosoftExt || 8831 getLangOptions().CPlusPlus) && 8832 (i + 1 == Fields.end() || Record->isUnion())))) { 8833 // Flexible array member. 8834 // Microsoft and g++ is more permissive regarding flexible array. 8835 // It will accept flexible array in union and also 8836 // as the sole element of a struct/class. 8837 if (getLangOptions().MicrosoftExt) { 8838 if (Record->isUnion()) 8839 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8840 << FD->getDeclName(); 8841 else if (Fields.size() == 1) 8842 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8843 << FD->getDeclName() << Record->getTagKind(); 8844 } else if (getLangOptions().CPlusPlus) { 8845 if (Record->isUnion()) 8846 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8847 << FD->getDeclName(); 8848 else if (Fields.size() == 1) 8849 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8850 << FD->getDeclName() << Record->getTagKind(); 8851 } else if (NumNamedMembers < 1) { 8852 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8853 << FD->getDeclName(); 8854 FD->setInvalidDecl(); 8855 EnclosingDecl->setInvalidDecl(); 8856 continue; 8857 } 8858 if (!FD->getType()->isDependentType() && 8859 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8860 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8861 << FD->getDeclName() << FD->getType(); 8862 FD->setInvalidDecl(); 8863 EnclosingDecl->setInvalidDecl(); 8864 continue; 8865 } 8866 // Okay, we have a legal flexible array member at the end of the struct. 8867 if (Record) 8868 Record->setHasFlexibleArrayMember(true); 8869 } else if (!FDTy->isDependentType() && 8870 RequireCompleteType(FD->getLocation(), FD->getType(), 8871 diag::err_field_incomplete)) { 8872 // Incomplete type 8873 FD->setInvalidDecl(); 8874 EnclosingDecl->setInvalidDecl(); 8875 continue; 8876 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8877 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8878 // If this is a member of a union, then entire union becomes "flexible". 8879 if (Record && Record->isUnion()) { 8880 Record->setHasFlexibleArrayMember(true); 8881 } else { 8882 // If this is a struct/class and this is not the last element, reject 8883 // it. Note that GCC supports variable sized arrays in the middle of 8884 // structures. 8885 if (i + 1 != Fields.end()) 8886 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8887 << FD->getDeclName() << FD->getType(); 8888 else { 8889 // We support flexible arrays at the end of structs in 8890 // other structs as an extension. 8891 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8892 << FD->getDeclName(); 8893 if (Record) 8894 Record->setHasFlexibleArrayMember(true); 8895 } 8896 } 8897 } 8898 if (Record && FDTTy->getDecl()->hasObjectMember()) 8899 Record->setHasObjectMember(true); 8900 } else if (FDTy->isObjCObjectType()) { 8901 /// A field cannot be an Objective-c object 8902 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8903 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8904 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8905 FD->setType(T); 8906 } 8907 else if (!getLangOptions().CPlusPlus) { 8908 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8909 // It's an error in ARC if a field has lifetime. 8910 // We don't want to report this in a system header, though, 8911 // so we just make the field unavailable. 8912 // FIXME: that's really not sufficient; we need to make the type 8913 // itself invalid to, say, initialize or copy. 8914 QualType T = FD->getType(); 8915 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8916 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8917 SourceLocation loc = FD->getLocation(); 8918 if (getSourceManager().isInSystemHeader(loc)) { 8919 if (!FD->hasAttr<UnavailableAttr>()) { 8920 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8921 "this system field has retaining ownership")); 8922 } 8923 } else { 8924 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8925 } 8926 ARCErrReported = true; 8927 } 8928 } 8929 else if (getLangOptions().ObjC1 && 8930 getLangOptions().getGC() != LangOptions::NonGC && 8931 Record && !Record->hasObjectMember()) { 8932 if (FD->getType()->isObjCObjectPointerType() || 8933 FD->getType().isObjCGCStrong()) 8934 Record->setHasObjectMember(true); 8935 else if (Context.getAsArrayType(FD->getType())) { 8936 QualType BaseType = Context.getBaseElementType(FD->getType()); 8937 if (BaseType->isRecordType() && 8938 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8939 Record->setHasObjectMember(true); 8940 else if (BaseType->isObjCObjectPointerType() || 8941 BaseType.isObjCGCStrong()) 8942 Record->setHasObjectMember(true); 8943 } 8944 } 8945 } 8946 // Keep track of the number of named members. 8947 if (FD->getIdentifier()) 8948 ++NumNamedMembers; 8949 } 8950 8951 // Okay, we successfully defined 'Record'. 8952 if (Record) { 8953 bool Completed = false; 8954 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8955 if (!CXXRecord->isInvalidDecl()) { 8956 // Set access bits correctly on the directly-declared conversions. 8957 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8958 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8959 I != E; ++I) 8960 Convs->setAccess(I, (*I)->getAccess()); 8961 8962 if (!CXXRecord->isDependentType()) { 8963 // Objective-C Automatic Reference Counting: 8964 // If a class has a non-static data member of Objective-C pointer 8965 // type (or array thereof), it is a non-POD type and its 8966 // default constructor (if any), copy constructor, copy assignment 8967 // operator, and destructor are non-trivial. 8968 // 8969 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8970 // However, here we check whether this particular class is only 8971 // non-POD because of the presence of an Objective-C pointer member. 8972 // If so, objects of this type cannot be shared between code compiled 8973 // with instant objects and code compiled with manual retain/release. 8974 if (getLangOptions().ObjCAutoRefCount && 8975 CXXRecord->hasObjectMember() && 8976 CXXRecord->getLinkage() == ExternalLinkage) { 8977 if (CXXRecord->isPOD()) { 8978 Diag(CXXRecord->getLocation(), 8979 diag::warn_arc_non_pod_class_with_object_member) 8980 << CXXRecord; 8981 } else { 8982 // FIXME: Fix-Its would be nice here, but finding a good location 8983 // for them is going to be tricky. 8984 if (CXXRecord->hasTrivialCopyConstructor()) 8985 Diag(CXXRecord->getLocation(), 8986 diag::warn_arc_trivial_member_function_with_object_member) 8987 << CXXRecord << 0; 8988 if (CXXRecord->hasTrivialCopyAssignment()) 8989 Diag(CXXRecord->getLocation(), 8990 diag::warn_arc_trivial_member_function_with_object_member) 8991 << CXXRecord << 1; 8992 if (CXXRecord->hasTrivialDestructor()) 8993 Diag(CXXRecord->getLocation(), 8994 diag::warn_arc_trivial_member_function_with_object_member) 8995 << CXXRecord << 2; 8996 } 8997 } 8998 8999 // Adjust user-defined destructor exception spec. 9000 if (getLangOptions().CPlusPlus0x && 9001 CXXRecord->hasUserDeclaredDestructor()) 9002 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9003 9004 // Add any implicitly-declared members to this class. 9005 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9006 9007 // If we have virtual base classes, we may end up finding multiple 9008 // final overriders for a given virtual function. Check for this 9009 // problem now. 9010 if (CXXRecord->getNumVBases()) { 9011 CXXFinalOverriderMap FinalOverriders; 9012 CXXRecord->getFinalOverriders(FinalOverriders); 9013 9014 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9015 MEnd = FinalOverriders.end(); 9016 M != MEnd; ++M) { 9017 for (OverridingMethods::iterator SO = M->second.begin(), 9018 SOEnd = M->second.end(); 9019 SO != SOEnd; ++SO) { 9020 assert(SO->second.size() > 0 && 9021 "Virtual function without overridding functions?"); 9022 if (SO->second.size() == 1) 9023 continue; 9024 9025 // C++ [class.virtual]p2: 9026 // In a derived class, if a virtual member function of a base 9027 // class subobject has more than one final overrider the 9028 // program is ill-formed. 9029 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9030 << (NamedDecl *)M->first << Record; 9031 Diag(M->first->getLocation(), 9032 diag::note_overridden_virtual_function); 9033 for (OverridingMethods::overriding_iterator 9034 OM = SO->second.begin(), 9035 OMEnd = SO->second.end(); 9036 OM != OMEnd; ++OM) 9037 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9038 << (NamedDecl *)M->first << OM->Method->getParent(); 9039 9040 Record->setInvalidDecl(); 9041 } 9042 } 9043 CXXRecord->completeDefinition(&FinalOverriders); 9044 Completed = true; 9045 } 9046 } 9047 } 9048 } 9049 9050 if (!Completed) 9051 Record->completeDefinition(); 9052 9053 // Now that the record is complete, do any delayed exception spec checks 9054 // we were missing. 9055 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9056 const CXXDestructorDecl *Dtor = 9057 DelayedDestructorExceptionSpecChecks.back().first; 9058 if (Dtor->getParent() != Record) 9059 break; 9060 9061 assert(!Dtor->getParent()->isDependentType() && 9062 "Should not ever add destructors of templates into the list."); 9063 CheckOverridingFunctionExceptionSpec(Dtor, 9064 DelayedDestructorExceptionSpecChecks.back().second); 9065 DelayedDestructorExceptionSpecChecks.pop_back(); 9066 } 9067 9068 } else { 9069 ObjCIvarDecl **ClsFields = 9070 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9071 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9072 ID->setLocEnd(RBrac); 9073 // Add ivar's to class's DeclContext. 9074 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9075 ClsFields[i]->setLexicalDeclContext(ID); 9076 ID->addDecl(ClsFields[i]); 9077 } 9078 // Must enforce the rule that ivars in the base classes may not be 9079 // duplicates. 9080 if (ID->getSuperClass()) 9081 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9082 } else if (ObjCImplementationDecl *IMPDecl = 9083 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9084 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9085 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9086 // Ivar declared in @implementation never belongs to the implementation. 9087 // Only it is in implementation's lexical context. 9088 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9089 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9090 } else if (ObjCCategoryDecl *CDecl = 9091 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9092 // case of ivars in class extension; all other cases have been 9093 // reported as errors elsewhere. 9094 // FIXME. Class extension does not have a LocEnd field. 9095 // CDecl->setLocEnd(RBrac); 9096 // Add ivar's to class extension's DeclContext. 9097 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9098 ClsFields[i]->setLexicalDeclContext(CDecl); 9099 CDecl->addDecl(ClsFields[i]); 9100 } 9101 } 9102 } 9103 9104 if (Attr) 9105 ProcessDeclAttributeList(S, Record, Attr); 9106 9107 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9108 // set the visibility of this record. 9109 if (Record && !Record->getDeclContext()->isRecord()) 9110 AddPushedVisibilityAttribute(Record); 9111} 9112 9113/// \brief Determine whether the given integral value is representable within 9114/// the given type T. 9115static bool isRepresentableIntegerValue(ASTContext &Context, 9116 llvm::APSInt &Value, 9117 QualType T) { 9118 assert(T->isIntegralType(Context) && "Integral type required!"); 9119 unsigned BitWidth = Context.getIntWidth(T); 9120 9121 if (Value.isUnsigned() || Value.isNonNegative()) { 9122 if (T->isSignedIntegerOrEnumerationType()) 9123 --BitWidth; 9124 return Value.getActiveBits() <= BitWidth; 9125 } 9126 return Value.getMinSignedBits() <= BitWidth; 9127} 9128 9129// \brief Given an integral type, return the next larger integral type 9130// (or a NULL type of no such type exists). 9131static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9132 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9133 // enum checking below. 9134 assert(T->isIntegralType(Context) && "Integral type required!"); 9135 const unsigned NumTypes = 4; 9136 QualType SignedIntegralTypes[NumTypes] = { 9137 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9138 }; 9139 QualType UnsignedIntegralTypes[NumTypes] = { 9140 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9141 Context.UnsignedLongLongTy 9142 }; 9143 9144 unsigned BitWidth = Context.getTypeSize(T); 9145 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9146 : UnsignedIntegralTypes; 9147 for (unsigned I = 0; I != NumTypes; ++I) 9148 if (Context.getTypeSize(Types[I]) > BitWidth) 9149 return Types[I]; 9150 9151 return QualType(); 9152} 9153 9154EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9155 EnumConstantDecl *LastEnumConst, 9156 SourceLocation IdLoc, 9157 IdentifierInfo *Id, 9158 Expr *Val) { 9159 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9160 llvm::APSInt EnumVal(IntWidth); 9161 QualType EltTy; 9162 9163 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9164 Val = 0; 9165 9166 if (Val) { 9167 if (Enum->isDependentType() || Val->isTypeDependent()) 9168 EltTy = Context.DependentTy; 9169 else { 9170 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9171 SourceLocation ExpLoc; 9172 if (!Val->isValueDependent() && 9173 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9174 Val = 0; 9175 } else { 9176 if (!getLangOptions().CPlusPlus) { 9177 // C99 6.7.2.2p2: 9178 // The expression that defines the value of an enumeration constant 9179 // shall be an integer constant expression that has a value 9180 // representable as an int. 9181 9182 // Complain if the value is not representable in an int. 9183 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9184 Diag(IdLoc, diag::ext_enum_value_not_int) 9185 << EnumVal.toString(10) << Val->getSourceRange() 9186 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9187 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9188 // Force the type of the expression to 'int'. 9189 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9190 } 9191 } 9192 9193 if (Enum->isFixed()) { 9194 EltTy = Enum->getIntegerType(); 9195 9196 // C++0x [dcl.enum]p5: 9197 // ... if the initializing value of an enumerator cannot be 9198 // represented by the underlying type, the program is ill-formed. 9199 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9200 if (getLangOptions().MicrosoftExt) { 9201 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9202 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9203 } else 9204 Diag(IdLoc, diag::err_enumerator_too_large) 9205 << EltTy; 9206 } else 9207 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9208 } 9209 else { 9210 // C++0x [dcl.enum]p5: 9211 // If the underlying type is not fixed, the type of each enumerator 9212 // is the type of its initializing value: 9213 // - If an initializer is specified for an enumerator, the 9214 // initializing value has the same type as the expression. 9215 EltTy = Val->getType(); 9216 } 9217 } 9218 } 9219 } 9220 9221 if (!Val) { 9222 if (Enum->isDependentType()) 9223 EltTy = Context.DependentTy; 9224 else if (!LastEnumConst) { 9225 // C++0x [dcl.enum]p5: 9226 // If the underlying type is not fixed, the type of each enumerator 9227 // is the type of its initializing value: 9228 // - If no initializer is specified for the first enumerator, the 9229 // initializing value has an unspecified integral type. 9230 // 9231 // GCC uses 'int' for its unspecified integral type, as does 9232 // C99 6.7.2.2p3. 9233 if (Enum->isFixed()) { 9234 EltTy = Enum->getIntegerType(); 9235 } 9236 else { 9237 EltTy = Context.IntTy; 9238 } 9239 } else { 9240 // Assign the last value + 1. 9241 EnumVal = LastEnumConst->getInitVal(); 9242 ++EnumVal; 9243 EltTy = LastEnumConst->getType(); 9244 9245 // Check for overflow on increment. 9246 if (EnumVal < LastEnumConst->getInitVal()) { 9247 // C++0x [dcl.enum]p5: 9248 // If the underlying type is not fixed, the type of each enumerator 9249 // is the type of its initializing value: 9250 // 9251 // - Otherwise the type of the initializing value is the same as 9252 // the type of the initializing value of the preceding enumerator 9253 // unless the incremented value is not representable in that type, 9254 // in which case the type is an unspecified integral type 9255 // sufficient to contain the incremented value. If no such type 9256 // exists, the program is ill-formed. 9257 QualType T = getNextLargerIntegralType(Context, EltTy); 9258 if (T.isNull() || Enum->isFixed()) { 9259 // There is no integral type larger enough to represent this 9260 // value. Complain, then allow the value to wrap around. 9261 EnumVal = LastEnumConst->getInitVal(); 9262 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9263 ++EnumVal; 9264 if (Enum->isFixed()) 9265 // When the underlying type is fixed, this is ill-formed. 9266 Diag(IdLoc, diag::err_enumerator_wrapped) 9267 << EnumVal.toString(10) 9268 << EltTy; 9269 else 9270 Diag(IdLoc, diag::warn_enumerator_too_large) 9271 << EnumVal.toString(10); 9272 } else { 9273 EltTy = T; 9274 } 9275 9276 // Retrieve the last enumerator's value, extent that type to the 9277 // type that is supposed to be large enough to represent the incremented 9278 // value, then increment. 9279 EnumVal = LastEnumConst->getInitVal(); 9280 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9281 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9282 ++EnumVal; 9283 9284 // If we're not in C++, diagnose the overflow of enumerator values, 9285 // which in C99 means that the enumerator value is not representable in 9286 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9287 // permits enumerator values that are representable in some larger 9288 // integral type. 9289 if (!getLangOptions().CPlusPlus && !T.isNull()) 9290 Diag(IdLoc, diag::warn_enum_value_overflow); 9291 } else if (!getLangOptions().CPlusPlus && 9292 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9293 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9294 Diag(IdLoc, diag::ext_enum_value_not_int) 9295 << EnumVal.toString(10) << 1; 9296 } 9297 } 9298 } 9299 9300 if (!EltTy->isDependentType()) { 9301 // Make the enumerator value match the signedness and size of the 9302 // enumerator's type. 9303 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9304 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9305 } 9306 9307 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9308 Val, EnumVal); 9309} 9310 9311 9312Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9313 SourceLocation IdLoc, IdentifierInfo *Id, 9314 AttributeList *Attr, 9315 SourceLocation EqualLoc, Expr *val) { 9316 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9317 EnumConstantDecl *LastEnumConst = 9318 cast_or_null<EnumConstantDecl>(lastEnumConst); 9319 Expr *Val = static_cast<Expr*>(val); 9320 9321 // The scope passed in may not be a decl scope. Zip up the scope tree until 9322 // we find one that is. 9323 S = getNonFieldDeclScope(S); 9324 9325 // Verify that there isn't already something declared with this name in this 9326 // scope. 9327 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9328 ForRedeclaration); 9329 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9330 // Maybe we will complain about the shadowed template parameter. 9331 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9332 // Just pretend that we didn't see the previous declaration. 9333 PrevDecl = 0; 9334 } 9335 9336 if (PrevDecl) { 9337 // When in C++, we may get a TagDecl with the same name; in this case the 9338 // enum constant will 'hide' the tag. 9339 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9340 "Received TagDecl when not in C++!"); 9341 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9342 if (isa<EnumConstantDecl>(PrevDecl)) 9343 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9344 else 9345 Diag(IdLoc, diag::err_redefinition) << Id; 9346 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9347 return 0; 9348 } 9349 } 9350 9351 // C++ [class.mem]p13: 9352 // If T is the name of a class, then each of the following shall have a 9353 // name different from T: 9354 // - every enumerator of every member of class T that is an enumerated 9355 // type 9356 if (CXXRecordDecl *Record 9357 = dyn_cast<CXXRecordDecl>( 9358 TheEnumDecl->getDeclContext()->getRedeclContext())) 9359 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9360 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9361 9362 EnumConstantDecl *New = 9363 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9364 9365 if (New) { 9366 // Process attributes. 9367 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9368 9369 // Register this decl in the current scope stack. 9370 New->setAccess(TheEnumDecl->getAccess()); 9371 PushOnScopeChains(New, S); 9372 } 9373 9374 return New; 9375} 9376 9377void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9378 SourceLocation RBraceLoc, Decl *EnumDeclX, 9379 Decl **Elements, unsigned NumElements, 9380 Scope *S, AttributeList *Attr) { 9381 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9382 QualType EnumType = Context.getTypeDeclType(Enum); 9383 9384 if (Attr) 9385 ProcessDeclAttributeList(S, Enum, Attr); 9386 9387 if (Enum->isDependentType()) { 9388 for (unsigned i = 0; i != NumElements; ++i) { 9389 EnumConstantDecl *ECD = 9390 cast_or_null<EnumConstantDecl>(Elements[i]); 9391 if (!ECD) continue; 9392 9393 ECD->setType(EnumType); 9394 } 9395 9396 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9397 return; 9398 } 9399 9400 // TODO: If the result value doesn't fit in an int, it must be a long or long 9401 // long value. ISO C does not support this, but GCC does as an extension, 9402 // emit a warning. 9403 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9404 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9405 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9406 9407 // Verify that all the values are okay, compute the size of the values, and 9408 // reverse the list. 9409 unsigned NumNegativeBits = 0; 9410 unsigned NumPositiveBits = 0; 9411 9412 // Keep track of whether all elements have type int. 9413 bool AllElementsInt = true; 9414 9415 for (unsigned i = 0; i != NumElements; ++i) { 9416 EnumConstantDecl *ECD = 9417 cast_or_null<EnumConstantDecl>(Elements[i]); 9418 if (!ECD) continue; // Already issued a diagnostic. 9419 9420 const llvm::APSInt &InitVal = ECD->getInitVal(); 9421 9422 // Keep track of the size of positive and negative values. 9423 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9424 NumPositiveBits = std::max(NumPositiveBits, 9425 (unsigned)InitVal.getActiveBits()); 9426 else 9427 NumNegativeBits = std::max(NumNegativeBits, 9428 (unsigned)InitVal.getMinSignedBits()); 9429 9430 // Keep track of whether every enum element has type int (very commmon). 9431 if (AllElementsInt) 9432 AllElementsInt = ECD->getType() == Context.IntTy; 9433 } 9434 9435 // Figure out the type that should be used for this enum. 9436 QualType BestType; 9437 unsigned BestWidth; 9438 9439 // C++0x N3000 [conv.prom]p3: 9440 // An rvalue of an unscoped enumeration type whose underlying 9441 // type is not fixed can be converted to an rvalue of the first 9442 // of the following types that can represent all the values of 9443 // the enumeration: int, unsigned int, long int, unsigned long 9444 // int, long long int, or unsigned long long int. 9445 // C99 6.4.4.3p2: 9446 // An identifier declared as an enumeration constant has type int. 9447 // The C99 rule is modified by a gcc extension 9448 QualType BestPromotionType; 9449 9450 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9451 // -fshort-enums is the equivalent to specifying the packed attribute on all 9452 // enum definitions. 9453 if (LangOpts.ShortEnums) 9454 Packed = true; 9455 9456 if (Enum->isFixed()) { 9457 BestType = BestPromotionType = Enum->getIntegerType(); 9458 // We don't need to set BestWidth, because BestType is going to be the type 9459 // of the enumerators, but we do anyway because otherwise some compilers 9460 // warn that it might be used uninitialized. 9461 BestWidth = CharWidth; 9462 } 9463 else if (NumNegativeBits) { 9464 // If there is a negative value, figure out the smallest integer type (of 9465 // int/long/longlong) that fits. 9466 // If it's packed, check also if it fits a char or a short. 9467 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9468 BestType = Context.SignedCharTy; 9469 BestWidth = CharWidth; 9470 } else if (Packed && NumNegativeBits <= ShortWidth && 9471 NumPositiveBits < ShortWidth) { 9472 BestType = Context.ShortTy; 9473 BestWidth = ShortWidth; 9474 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9475 BestType = Context.IntTy; 9476 BestWidth = IntWidth; 9477 } else { 9478 BestWidth = Context.getTargetInfo().getLongWidth(); 9479 9480 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9481 BestType = Context.LongTy; 9482 } else { 9483 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9484 9485 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9486 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9487 BestType = Context.LongLongTy; 9488 } 9489 } 9490 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9491 } else { 9492 // If there is no negative value, figure out the smallest type that fits 9493 // all of the enumerator values. 9494 // If it's packed, check also if it fits a char or a short. 9495 if (Packed && NumPositiveBits <= CharWidth) { 9496 BestType = Context.UnsignedCharTy; 9497 BestPromotionType = Context.IntTy; 9498 BestWidth = CharWidth; 9499 } else if (Packed && NumPositiveBits <= ShortWidth) { 9500 BestType = Context.UnsignedShortTy; 9501 BestPromotionType = Context.IntTy; 9502 BestWidth = ShortWidth; 9503 } else if (NumPositiveBits <= IntWidth) { 9504 BestType = Context.UnsignedIntTy; 9505 BestWidth = IntWidth; 9506 BestPromotionType 9507 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9508 ? Context.UnsignedIntTy : Context.IntTy; 9509 } else if (NumPositiveBits <= 9510 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9511 BestType = Context.UnsignedLongTy; 9512 BestPromotionType 9513 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9514 ? Context.UnsignedLongTy : Context.LongTy; 9515 } else { 9516 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9517 assert(NumPositiveBits <= BestWidth && 9518 "How could an initializer get larger than ULL?"); 9519 BestType = Context.UnsignedLongLongTy; 9520 BestPromotionType 9521 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9522 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9523 } 9524 } 9525 9526 // Loop over all of the enumerator constants, changing their types to match 9527 // the type of the enum if needed. 9528 for (unsigned i = 0; i != NumElements; ++i) { 9529 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9530 if (!ECD) continue; // Already issued a diagnostic. 9531 9532 // Standard C says the enumerators have int type, but we allow, as an 9533 // extension, the enumerators to be larger than int size. If each 9534 // enumerator value fits in an int, type it as an int, otherwise type it the 9535 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9536 // that X has type 'int', not 'unsigned'. 9537 9538 // Determine whether the value fits into an int. 9539 llvm::APSInt InitVal = ECD->getInitVal(); 9540 9541 // If it fits into an integer type, force it. Otherwise force it to match 9542 // the enum decl type. 9543 QualType NewTy; 9544 unsigned NewWidth; 9545 bool NewSign; 9546 if (!getLangOptions().CPlusPlus && 9547 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9548 NewTy = Context.IntTy; 9549 NewWidth = IntWidth; 9550 NewSign = true; 9551 } else if (ECD->getType() == BestType) { 9552 // Already the right type! 9553 if (getLangOptions().CPlusPlus) 9554 // C++ [dcl.enum]p4: Following the closing brace of an 9555 // enum-specifier, each enumerator has the type of its 9556 // enumeration. 9557 ECD->setType(EnumType); 9558 continue; 9559 } else { 9560 NewTy = BestType; 9561 NewWidth = BestWidth; 9562 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9563 } 9564 9565 // Adjust the APSInt value. 9566 InitVal = InitVal.extOrTrunc(NewWidth); 9567 InitVal.setIsSigned(NewSign); 9568 ECD->setInitVal(InitVal); 9569 9570 // Adjust the Expr initializer and type. 9571 if (ECD->getInitExpr() && 9572 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9573 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9574 CK_IntegralCast, 9575 ECD->getInitExpr(), 9576 /*base paths*/ 0, 9577 VK_RValue)); 9578 if (getLangOptions().CPlusPlus) 9579 // C++ [dcl.enum]p4: Following the closing brace of an 9580 // enum-specifier, each enumerator has the type of its 9581 // enumeration. 9582 ECD->setType(EnumType); 9583 else 9584 ECD->setType(NewTy); 9585 } 9586 9587 Enum->completeDefinition(BestType, BestPromotionType, 9588 NumPositiveBits, NumNegativeBits); 9589} 9590 9591Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9592 SourceLocation StartLoc, 9593 SourceLocation EndLoc) { 9594 StringLiteral *AsmString = cast<StringLiteral>(expr); 9595 9596 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9597 AsmString, StartLoc, 9598 EndLoc); 9599 CurContext->addDecl(New); 9600 return New; 9601} 9602 9603DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9604 IdentifierInfo &ModuleName, 9605 SourceLocation ModuleNameLoc) { 9606 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9607 ModuleName, ModuleNameLoc); 9608 if (!Module) 9609 return true; 9610 9611 // FIXME: Actually create a declaration to describe the module import. 9612 (void)Module; 9613 return DeclResult((Decl *)0); 9614} 9615 9616void 9617Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9618 SourceLocation ModulePrivateKeyword) { 9619 assert(!Old->isModulePrivate() && "Old is module-private!"); 9620 9621 Diag(New->getLocation(), diag::err_module_private_follows_public) 9622 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9623 Diag(Old->getLocation(), diag::note_previous_declaration) 9624 << Old->getDeclName(); 9625 9626 // Drop the __module_private__ from the new declaration, since it's invalid. 9627 New->setModulePrivate(false); 9628} 9629 9630void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9631 SourceLocation PragmaLoc, 9632 SourceLocation NameLoc) { 9633 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9634 9635 if (PrevDecl) { 9636 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9637 } else { 9638 (void)WeakUndeclaredIdentifiers.insert( 9639 std::pair<IdentifierInfo*,WeakInfo> 9640 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9641 } 9642} 9643 9644void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9645 IdentifierInfo* AliasName, 9646 SourceLocation PragmaLoc, 9647 SourceLocation NameLoc, 9648 SourceLocation AliasNameLoc) { 9649 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9650 LookupOrdinaryName); 9651 WeakInfo W = WeakInfo(Name, NameLoc); 9652 9653 if (PrevDecl) { 9654 if (!PrevDecl->hasAttr<AliasAttr>()) 9655 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9656 DeclApplyPragmaWeak(TUScope, ND, W); 9657 } else { 9658 (void)WeakUndeclaredIdentifiers.insert( 9659 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9660 } 9661} 9662 9663Decl *Sema::getObjCDeclContext() const { 9664 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9665} 9666 9667AvailabilityResult Sema::getCurContextAvailability() const { 9668 const Decl *D = cast<Decl>(getCurLexicalContext()); 9669 // A category implicitly has the availability of the interface. 9670 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9671 D = CatD->getClassInterface(); 9672 9673 return D->getAvailability(); 9674} 9675