SemaDecl.cpp revision 45fa560c72441069d9e4eb1e66efd87349caa552
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 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 421 .get(); 422 } else { 423 assert(SS && SS->isInvalid() && 424 "Invalid scope specifier has already been diagnosed"); 425 } 426 427 return true; 428} 429 430/// \brief Determine whether the given result set contains either a type name 431/// or 432static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 433 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 434 NextToken.is(tok::less); 435 436 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 437 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 438 return true; 439 440 if (CheckTemplate && isa<TemplateDecl>(*I)) 441 return true; 442 } 443 444 return false; 445} 446 447Sema::NameClassification Sema::ClassifyName(Scope *S, 448 CXXScopeSpec &SS, 449 IdentifierInfo *&Name, 450 SourceLocation NameLoc, 451 const Token &NextToken) { 452 DeclarationNameInfo NameInfo(Name, NameLoc); 453 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 454 455 if (NextToken.is(tok::coloncolon)) { 456 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 457 QualType(), false, SS, 0, false); 458 459 } 460 461 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 462 LookupParsedName(Result, S, &SS, !CurMethod); 463 464 // Perform lookup for Objective-C instance variables (including automatically 465 // synthesized instance variables), if we're in an Objective-C method. 466 // FIXME: This lookup really, really needs to be folded in to the normal 467 // unqualified lookup mechanism. 468 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 469 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 470 if (E.get() || E.isInvalid()) 471 return E; 472 } 473 474 bool SecondTry = false; 475 bool IsFilteredTemplateName = false; 476 477Corrected: 478 switch (Result.getResultKind()) { 479 case LookupResult::NotFound: 480 // If an unqualified-id is followed by a '(', then we have a function 481 // call. 482 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 483 // In C++, this is an ADL-only call. 484 // FIXME: Reference? 485 if (getLangOptions().CPlusPlus) 486 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 487 488 // C90 6.3.2.2: 489 // If the expression that precedes the parenthesized argument list in a 490 // function call consists solely of an identifier, and if no 491 // declaration is visible for this identifier, the identifier is 492 // implicitly declared exactly as if, in the innermost block containing 493 // the function call, the declaration 494 // 495 // extern int identifier (); 496 // 497 // appeared. 498 // 499 // We also allow this in C99 as an extension. 500 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 501 Result.addDecl(D); 502 Result.resolveKind(); 503 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 504 } 505 } 506 507 // In C, we first see whether there is a tag type by the same name, in 508 // which case it's likely that the user just forget to write "enum", 509 // "struct", or "union". 510 if (!getLangOptions().CPlusPlus && !SecondTry) { 511 Result.clear(LookupTagName); 512 LookupParsedName(Result, S, &SS); 513 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 514 const char *TagName = 0; 515 const char *FixItTagName = 0; 516 switch (Tag->getTagKind()) { 517 case TTK_Class: 518 TagName = "class"; 519 FixItTagName = "class "; 520 break; 521 522 case TTK_Enum: 523 TagName = "enum"; 524 FixItTagName = "enum "; 525 break; 526 527 case TTK_Struct: 528 TagName = "struct"; 529 FixItTagName = "struct "; 530 break; 531 532 case TTK_Union: 533 TagName = "union"; 534 FixItTagName = "union "; 535 break; 536 } 537 538 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 539 << Name << TagName << getLangOptions().CPlusPlus 540 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 541 break; 542 } 543 544 Result.clear(LookupOrdinaryName); 545 } 546 547 // Perform typo correction to determine if there is another name that is 548 // close to this name. 549 if (!SecondTry) { 550 SecondTry = true; 551 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 552 Result.getLookupKind(), S, 553 &SS)) { 554 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 555 unsigned QualifiedDiag = diag::err_no_member_suggest; 556 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 557 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 558 559 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 560 NamedDecl *UnderlyingFirstDecl 561 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 562 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 563 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 564 UnqualifiedDiag = diag::err_no_template_suggest; 565 QualifiedDiag = diag::err_no_member_template_suggest; 566 } else if (UnderlyingFirstDecl && 567 (isa<TypeDecl>(UnderlyingFirstDecl) || 568 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 569 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 570 UnqualifiedDiag = diag::err_unknown_typename_suggest; 571 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 572 } 573 574 if (SS.isEmpty()) 575 Diag(NameLoc, UnqualifiedDiag) 576 << Name << CorrectedQuotedStr 577 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 578 else 579 Diag(NameLoc, QualifiedDiag) 580 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 581 << SS.getRange() 582 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 583 584 // Update the name, so that the caller has the new name. 585 Name = Corrected.getCorrectionAsIdentifierInfo(); 586 587 // Also update the LookupResult... 588 // FIXME: This should probably go away at some point 589 Result.clear(); 590 Result.setLookupName(Corrected.getCorrection()); 591 if (FirstDecl) Result.addDecl(FirstDecl); 592 593 // Typo correction corrected to a keyword. 594 if (Corrected.isKeyword()) 595 return Corrected.getCorrectionAsIdentifierInfo(); 596 597 if (FirstDecl) 598 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 599 << CorrectedQuotedStr; 600 601 // If we found an Objective-C instance variable, let 602 // LookupInObjCMethod build the appropriate expression to 603 // reference the ivar. 604 // FIXME: This is a gross hack. 605 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 606 Result.clear(); 607 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 608 return move(E); 609 } 610 611 goto Corrected; 612 } 613 } 614 615 // We failed to correct; just fall through and let the parser deal with it. 616 Result.suppressDiagnostics(); 617 return NameClassification::Unknown(); 618 619 case LookupResult::NotFoundInCurrentInstantiation: 620 // We performed name lookup into the current instantiation, and there were 621 // dependent bases, so we treat this result the same way as any other 622 // dependent nested-name-specifier. 623 624 // C++ [temp.res]p2: 625 // A name used in a template declaration or definition and that is 626 // dependent on a template-parameter is assumed not to name a type 627 // unless the applicable name lookup finds a type name or the name is 628 // qualified by the keyword typename. 629 // 630 // FIXME: If the next token is '<', we might want to ask the parser to 631 // perform some heroics to see if we actually have a 632 // template-argument-list, which would indicate a missing 'template' 633 // keyword here. 634 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 635 636 case LookupResult::Found: 637 case LookupResult::FoundOverloaded: 638 case LookupResult::FoundUnresolvedValue: 639 break; 640 641 case LookupResult::Ambiguous: 642 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 643 hasAnyAcceptableTemplateNames(Result)) { 644 // C++ [temp.local]p3: 645 // A lookup that finds an injected-class-name (10.2) can result in an 646 // ambiguity in certain cases (for example, if it is found in more than 647 // one base class). If all of the injected-class-names that are found 648 // refer to specializations of the same class template, and if the name 649 // is followed by a template-argument-list, the reference refers to the 650 // class template itself and not a specialization thereof, and is not 651 // ambiguous. 652 // 653 // This filtering can make an ambiguous result into an unambiguous one, 654 // so try again after filtering out template names. 655 FilterAcceptableTemplateNames(Result); 656 if (!Result.isAmbiguous()) { 657 IsFilteredTemplateName = true; 658 break; 659 } 660 } 661 662 // Diagnose the ambiguity and return an error. 663 return NameClassification::Error(); 664 } 665 666 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 667 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 668 // C++ [temp.names]p3: 669 // After name lookup (3.4) finds that a name is a template-name or that 670 // an operator-function-id or a literal- operator-id refers to a set of 671 // overloaded functions any member of which is a function template if 672 // this is followed by a <, the < is always taken as the delimiter of a 673 // template-argument-list and never as the less-than operator. 674 if (!IsFilteredTemplateName) 675 FilterAcceptableTemplateNames(Result); 676 677 if (!Result.empty()) { 678 bool IsFunctionTemplate; 679 TemplateName Template; 680 if (Result.end() - Result.begin() > 1) { 681 IsFunctionTemplate = true; 682 Template = Context.getOverloadedTemplateName(Result.begin(), 683 Result.end()); 684 } else { 685 TemplateDecl *TD 686 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 687 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 688 689 if (SS.isSet() && !SS.isInvalid()) 690 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 691 /*TemplateKeyword=*/false, 692 TD); 693 else 694 Template = TemplateName(TD); 695 } 696 697 if (IsFunctionTemplate) { 698 // Function templates always go through overload resolution, at which 699 // point we'll perform the various checks (e.g., accessibility) we need 700 // to based on which function we selected. 701 Result.suppressDiagnostics(); 702 703 return NameClassification::FunctionTemplate(Template); 704 } 705 706 return NameClassification::TypeTemplate(Template); 707 } 708 } 709 710 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 711 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 712 DiagnoseUseOfDecl(Type, NameLoc); 713 QualType T = Context.getTypeDeclType(Type); 714 return ParsedType::make(T); 715 } 716 717 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 718 if (!Class) { 719 // FIXME: It's unfortunate that we don't have a Type node for handling this. 720 if (ObjCCompatibleAliasDecl *Alias 721 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 722 Class = Alias->getClassInterface(); 723 } 724 725 if (Class) { 726 DiagnoseUseOfDecl(Class, NameLoc); 727 728 if (NextToken.is(tok::period)) { 729 // Interface. <something> is parsed as a property reference expression. 730 // Just return "unknown" as a fall-through for now. 731 Result.suppressDiagnostics(); 732 return NameClassification::Unknown(); 733 } 734 735 QualType T = Context.getObjCInterfaceType(Class); 736 return ParsedType::make(T); 737 } 738 739 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 740 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 741 742 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 743 return BuildDeclarationNameExpr(SS, Result, ADL); 744} 745 746// Determines the context to return to after temporarily entering a 747// context. This depends in an unnecessarily complicated way on the 748// exact ordering of callbacks from the parser. 749DeclContext *Sema::getContainingDC(DeclContext *DC) { 750 751 // Functions defined inline within classes aren't parsed until we've 752 // finished parsing the top-level class, so the top-level class is 753 // the context we'll need to return to. 754 if (isa<FunctionDecl>(DC)) { 755 DC = DC->getLexicalParent(); 756 757 // A function not defined within a class will always return to its 758 // lexical context. 759 if (!isa<CXXRecordDecl>(DC)) 760 return DC; 761 762 // A C++ inline method/friend is parsed *after* the topmost class 763 // it was declared in is fully parsed ("complete"); the topmost 764 // class is the context we need to return to. 765 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 766 DC = RD; 767 768 // Return the declaration context of the topmost class the inline method is 769 // declared in. 770 return DC; 771 } 772 773 return DC->getLexicalParent(); 774} 775 776void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 777 assert(getContainingDC(DC) == CurContext && 778 "The next DeclContext should be lexically contained in the current one."); 779 CurContext = DC; 780 S->setEntity(DC); 781} 782 783void Sema::PopDeclContext() { 784 assert(CurContext && "DeclContext imbalance!"); 785 786 CurContext = getContainingDC(CurContext); 787 assert(CurContext && "Popped translation unit!"); 788} 789 790/// EnterDeclaratorContext - Used when we must lookup names in the context 791/// of a declarator's nested name specifier. 792/// 793void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 794 // C++0x [basic.lookup.unqual]p13: 795 // A name used in the definition of a static data member of class 796 // X (after the qualified-id of the static member) is looked up as 797 // if the name was used in a member function of X. 798 // C++0x [basic.lookup.unqual]p14: 799 // If a variable member of a namespace is defined outside of the 800 // scope of its namespace then any name used in the definition of 801 // the variable member (after the declarator-id) is looked up as 802 // if the definition of the variable member occurred in its 803 // namespace. 804 // Both of these imply that we should push a scope whose context 805 // is the semantic context of the declaration. We can't use 806 // PushDeclContext here because that context is not necessarily 807 // lexically contained in the current context. Fortunately, 808 // the containing scope should have the appropriate information. 809 810 assert(!S->getEntity() && "scope already has entity"); 811 812#ifndef NDEBUG 813 Scope *Ancestor = S->getParent(); 814 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 815 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 816#endif 817 818 CurContext = DC; 819 S->setEntity(DC); 820} 821 822void Sema::ExitDeclaratorContext(Scope *S) { 823 assert(S->getEntity() == CurContext && "Context imbalance!"); 824 825 // Switch back to the lexical context. The safety of this is 826 // enforced by an assert in EnterDeclaratorContext. 827 Scope *Ancestor = S->getParent(); 828 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 829 CurContext = (DeclContext*) Ancestor->getEntity(); 830 831 // We don't need to do anything with the scope, which is going to 832 // disappear. 833} 834 835 836void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 837 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 838 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 839 // We assume that the caller has already called 840 // ActOnReenterTemplateScope 841 FD = TFD->getTemplatedDecl(); 842 } 843 if (!FD) 844 return; 845 846 PushDeclContext(S, FD); 847 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 848 ParmVarDecl *Param = FD->getParamDecl(P); 849 // If the parameter has an identifier, then add it to the scope 850 if (Param->getIdentifier()) { 851 S->AddDecl(Param); 852 IdResolver.AddDecl(Param); 853 } 854 } 855} 856 857 858/// \brief Determine whether we allow overloading of the function 859/// PrevDecl with another declaration. 860/// 861/// This routine determines whether overloading is possible, not 862/// whether some new function is actually an overload. It will return 863/// true in C++ (where we can always provide overloads) or, as an 864/// extension, in C when the previous function is already an 865/// overloaded function declaration or has the "overloadable" 866/// attribute. 867static bool AllowOverloadingOfFunction(LookupResult &Previous, 868 ASTContext &Context) { 869 if (Context.getLangOptions().CPlusPlus) 870 return true; 871 872 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 873 return true; 874 875 return (Previous.getResultKind() == LookupResult::Found 876 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 877} 878 879/// Add this decl to the scope shadowed decl chains. 880void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 881 // Move up the scope chain until we find the nearest enclosing 882 // non-transparent context. The declaration will be introduced into this 883 // scope. 884 while (S->getEntity() && 885 ((DeclContext *)S->getEntity())->isTransparentContext()) 886 S = S->getParent(); 887 888 // Add scoped declarations into their context, so that they can be 889 // found later. Declarations without a context won't be inserted 890 // into any context. 891 if (AddToContext) 892 CurContext->addDecl(D); 893 894 // Out-of-line definitions shouldn't be pushed into scope in C++. 895 // Out-of-line variable and function definitions shouldn't even in C. 896 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 897 D->isOutOfLine() && 898 !D->getDeclContext()->getRedeclContext()->Equals( 899 D->getLexicalDeclContext()->getRedeclContext())) 900 return; 901 902 // Template instantiations should also not be pushed into scope. 903 if (isa<FunctionDecl>(D) && 904 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 905 return; 906 907 // If this replaces anything in the current scope, 908 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 909 IEnd = IdResolver.end(); 910 for (; I != IEnd; ++I) { 911 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 912 S->RemoveDecl(*I); 913 IdResolver.RemoveDecl(*I); 914 915 // Should only need to replace one decl. 916 break; 917 } 918 } 919 920 S->AddDecl(D); 921 922 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 923 // Implicitly-generated labels may end up getting generated in an order that 924 // isn't strictly lexical, which breaks name lookup. Be careful to insert 925 // the label at the appropriate place in the identifier chain. 926 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 927 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 928 if (IDC == CurContext) { 929 if (!S->isDeclScope(*I)) 930 continue; 931 } else if (IDC->Encloses(CurContext)) 932 break; 933 } 934 935 IdResolver.InsertDeclAfter(I, D); 936 } else { 937 IdResolver.AddDecl(D); 938 } 939} 940 941void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 942 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 943 TUScope->AddDecl(D); 944} 945 946bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 947 bool ExplicitInstantiationOrSpecialization) { 948 return IdResolver.isDeclInScope(D, Ctx, Context, S, 949 ExplicitInstantiationOrSpecialization); 950} 951 952Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 953 DeclContext *TargetDC = DC->getPrimaryContext(); 954 do { 955 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 956 if (ScopeDC->getPrimaryContext() == TargetDC) 957 return S; 958 } while ((S = S->getParent())); 959 960 return 0; 961} 962 963static bool isOutOfScopePreviousDeclaration(NamedDecl *, 964 DeclContext*, 965 ASTContext&); 966 967/// Filters out lookup results that don't fall within the given scope 968/// as determined by isDeclInScope. 969void Sema::FilterLookupForScope(LookupResult &R, 970 DeclContext *Ctx, Scope *S, 971 bool ConsiderLinkage, 972 bool ExplicitInstantiationOrSpecialization) { 973 LookupResult::Filter F = R.makeFilter(); 974 while (F.hasNext()) { 975 NamedDecl *D = F.next(); 976 977 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 978 continue; 979 980 if (ConsiderLinkage && 981 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 982 continue; 983 984 F.erase(); 985 } 986 987 F.done(); 988} 989 990static bool isUsingDecl(NamedDecl *D) { 991 return isa<UsingShadowDecl>(D) || 992 isa<UnresolvedUsingTypenameDecl>(D) || 993 isa<UnresolvedUsingValueDecl>(D); 994} 995 996/// Removes using shadow declarations from the lookup results. 997static void RemoveUsingDecls(LookupResult &R) { 998 LookupResult::Filter F = R.makeFilter(); 999 while (F.hasNext()) 1000 if (isUsingDecl(F.next())) 1001 F.erase(); 1002 1003 F.done(); 1004} 1005 1006/// \brief Check for this common pattern: 1007/// @code 1008/// class S { 1009/// S(const S&); // DO NOT IMPLEMENT 1010/// void operator=(const S&); // DO NOT IMPLEMENT 1011/// }; 1012/// @endcode 1013static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1014 // FIXME: Should check for private access too but access is set after we get 1015 // the decl here. 1016 if (D->doesThisDeclarationHaveABody()) 1017 return false; 1018 1019 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1020 return CD->isCopyConstructor(); 1021 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1022 return Method->isCopyAssignmentOperator(); 1023 return false; 1024} 1025 1026bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1027 assert(D); 1028 1029 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1030 return false; 1031 1032 // Ignore class templates. 1033 if (D->getDeclContext()->isDependentContext() || 1034 D->getLexicalDeclContext()->isDependentContext()) 1035 return false; 1036 1037 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1038 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1039 return false; 1040 1041 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1042 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1043 return false; 1044 } else { 1045 // 'static inline' functions are used in headers; don't warn. 1046 if (FD->getStorageClass() == SC_Static && 1047 FD->isInlineSpecified()) 1048 return false; 1049 } 1050 1051 if (FD->doesThisDeclarationHaveABody() && 1052 Context.DeclMustBeEmitted(FD)) 1053 return false; 1054 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1055 if (!VD->isFileVarDecl() || 1056 VD->getType().isConstant(Context) || 1057 Context.DeclMustBeEmitted(VD)) 1058 return false; 1059 1060 if (VD->isStaticDataMember() && 1061 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1062 return false; 1063 1064 } else { 1065 return false; 1066 } 1067 1068 // Only warn for unused decls internal to the translation unit. 1069 if (D->getLinkage() == ExternalLinkage) 1070 return false; 1071 1072 return true; 1073} 1074 1075void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1076 if (!D) 1077 return; 1078 1079 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1080 const FunctionDecl *First = FD->getFirstDeclaration(); 1081 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1082 return; // First should already be in the vector. 1083 } 1084 1085 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1086 const VarDecl *First = VD->getFirstDeclaration(); 1087 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1088 return; // First should already be in the vector. 1089 } 1090 1091 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1092 UnusedFileScopedDecls.push_back(D); 1093 } 1094 1095static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1096 if (D->isInvalidDecl()) 1097 return false; 1098 1099 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1100 return false; 1101 1102 if (isa<LabelDecl>(D)) 1103 return true; 1104 1105 // White-list anything that isn't a local variable. 1106 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1107 !D->getDeclContext()->isFunctionOrMethod()) 1108 return false; 1109 1110 // Types of valid local variables should be complete, so this should succeed. 1111 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1112 1113 // White-list anything with an __attribute__((unused)) type. 1114 QualType Ty = VD->getType(); 1115 1116 // Only look at the outermost level of typedef. 1117 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1118 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1119 return false; 1120 } 1121 1122 // If we failed to complete the type for some reason, or if the type is 1123 // dependent, don't diagnose the variable. 1124 if (Ty->isIncompleteType() || Ty->isDependentType()) 1125 return false; 1126 1127 if (const TagType *TT = Ty->getAs<TagType>()) { 1128 const TagDecl *Tag = TT->getDecl(); 1129 if (Tag->hasAttr<UnusedAttr>()) 1130 return false; 1131 1132 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1133 // FIXME: Checking for the presence of a user-declared constructor 1134 // isn't completely accurate; we'd prefer to check that the initializer 1135 // has no side effects. 1136 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1137 return false; 1138 } 1139 } 1140 1141 // TODO: __attribute__((unused)) templates? 1142 } 1143 1144 return true; 1145} 1146 1147static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1148 FixItHint &Hint) { 1149 if (isa<LabelDecl>(D)) { 1150 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1151 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1152 if (AfterColon.isInvalid()) 1153 return; 1154 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1155 getCharRange(D->getLocStart(), AfterColon)); 1156 } 1157 return; 1158} 1159 1160/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1161/// unless they are marked attr(unused). 1162void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1163 FixItHint Hint; 1164 if (!ShouldDiagnoseUnusedDecl(D)) 1165 return; 1166 1167 GenerateFixForUnusedDecl(D, Context, Hint); 1168 1169 unsigned DiagID; 1170 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1171 DiagID = diag::warn_unused_exception_param; 1172 else if (isa<LabelDecl>(D)) 1173 DiagID = diag::warn_unused_label; 1174 else 1175 DiagID = diag::warn_unused_variable; 1176 1177 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1178} 1179 1180static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1181 // Verify that we have no forward references left. If so, there was a goto 1182 // or address of a label taken, but no definition of it. Label fwd 1183 // definitions are indicated with a null substmt. 1184 if (L->getStmt() == 0) 1185 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1186} 1187 1188void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1189 if (S->decl_empty()) return; 1190 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1191 "Scope shouldn't contain decls!"); 1192 1193 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1194 I != E; ++I) { 1195 Decl *TmpD = (*I); 1196 assert(TmpD && "This decl didn't get pushed??"); 1197 1198 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1199 NamedDecl *D = cast<NamedDecl>(TmpD); 1200 1201 if (!D->getDeclName()) continue; 1202 1203 // Diagnose unused variables in this scope. 1204 if (!S->hasErrorOccurred()) 1205 DiagnoseUnusedDecl(D); 1206 1207 // If this was a forward reference to a label, verify it was defined. 1208 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1209 CheckPoppedLabel(LD, *this); 1210 1211 // Remove this name from our lexical scope. 1212 IdResolver.RemoveDecl(D); 1213 } 1214} 1215 1216/// \brief Look for an Objective-C class in the translation unit. 1217/// 1218/// \param Id The name of the Objective-C class we're looking for. If 1219/// typo-correction fixes this name, the Id will be updated 1220/// to the fixed name. 1221/// 1222/// \param IdLoc The location of the name in the translation unit. 1223/// 1224/// \param TypoCorrection If true, this routine will attempt typo correction 1225/// if there is no class with the given name. 1226/// 1227/// \returns The declaration of the named Objective-C class, or NULL if the 1228/// class could not be found. 1229ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1230 SourceLocation IdLoc, 1231 bool DoTypoCorrection) { 1232 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1233 // creation from this context. 1234 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1235 1236 if (!IDecl && DoTypoCorrection) { 1237 // Perform typo correction at the given location, but only if we 1238 // find an Objective-C class name. 1239 TypoCorrection C; 1240 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1241 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1242 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1243 Diag(IdLoc, diag::err_undef_interface_suggest) 1244 << Id << IDecl->getDeclName() 1245 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1246 Diag(IDecl->getLocation(), diag::note_previous_decl) 1247 << IDecl->getDeclName(); 1248 1249 Id = IDecl->getIdentifier(); 1250 } 1251 } 1252 1253 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1254} 1255 1256/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1257/// from S, where a non-field would be declared. This routine copes 1258/// with the difference between C and C++ scoping rules in structs and 1259/// unions. For example, the following code is well-formed in C but 1260/// ill-formed in C++: 1261/// @code 1262/// struct S6 { 1263/// enum { BAR } e; 1264/// }; 1265/// 1266/// void test_S6() { 1267/// struct S6 a; 1268/// a.e = BAR; 1269/// } 1270/// @endcode 1271/// For the declaration of BAR, this routine will return a different 1272/// scope. The scope S will be the scope of the unnamed enumeration 1273/// within S6. In C++, this routine will return the scope associated 1274/// with S6, because the enumeration's scope is a transparent 1275/// context but structures can contain non-field names. In C, this 1276/// routine will return the translation unit scope, since the 1277/// enumeration's scope is a transparent context and structures cannot 1278/// contain non-field names. 1279Scope *Sema::getNonFieldDeclScope(Scope *S) { 1280 while (((S->getFlags() & Scope::DeclScope) == 0) || 1281 (S->getEntity() && 1282 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1283 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1284 S = S->getParent(); 1285 return S; 1286} 1287 1288/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1289/// file scope. lazily create a decl for it. ForRedeclaration is true 1290/// if we're creating this built-in in anticipation of redeclaring the 1291/// built-in. 1292NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1293 Scope *S, bool ForRedeclaration, 1294 SourceLocation Loc) { 1295 Builtin::ID BID = (Builtin::ID)bid; 1296 1297 ASTContext::GetBuiltinTypeError Error; 1298 QualType R = Context.GetBuiltinType(BID, Error); 1299 switch (Error) { 1300 case ASTContext::GE_None: 1301 // Okay 1302 break; 1303 1304 case ASTContext::GE_Missing_stdio: 1305 if (ForRedeclaration) 1306 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1307 << Context.BuiltinInfo.GetName(BID); 1308 return 0; 1309 1310 case ASTContext::GE_Missing_setjmp: 1311 if (ForRedeclaration) 1312 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1313 << Context.BuiltinInfo.GetName(BID); 1314 return 0; 1315 } 1316 1317 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1318 Diag(Loc, diag::ext_implicit_lib_function_decl) 1319 << Context.BuiltinInfo.GetName(BID) 1320 << R; 1321 if (Context.BuiltinInfo.getHeaderName(BID) && 1322 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1323 != DiagnosticsEngine::Ignored) 1324 Diag(Loc, diag::note_please_include_header) 1325 << Context.BuiltinInfo.getHeaderName(BID) 1326 << Context.BuiltinInfo.GetName(BID); 1327 } 1328 1329 FunctionDecl *New = FunctionDecl::Create(Context, 1330 Context.getTranslationUnitDecl(), 1331 Loc, Loc, II, R, /*TInfo=*/0, 1332 SC_Extern, 1333 SC_None, false, 1334 /*hasPrototype=*/true); 1335 New->setImplicit(); 1336 1337 // Create Decl objects for each parameter, adding them to the 1338 // FunctionDecl. 1339 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1340 SmallVector<ParmVarDecl*, 16> Params; 1341 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1342 ParmVarDecl *parm = 1343 ParmVarDecl::Create(Context, New, SourceLocation(), 1344 SourceLocation(), 0, 1345 FT->getArgType(i), /*TInfo=*/0, 1346 SC_None, SC_None, 0); 1347 parm->setScopeInfo(0, i); 1348 Params.push_back(parm); 1349 } 1350 New->setParams(Params); 1351 } 1352 1353 AddKnownFunctionAttributes(New); 1354 1355 // TUScope is the translation-unit scope to insert this function into. 1356 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1357 // relate Scopes to DeclContexts, and probably eliminate CurContext 1358 // entirely, but we're not there yet. 1359 DeclContext *SavedContext = CurContext; 1360 CurContext = Context.getTranslationUnitDecl(); 1361 PushOnScopeChains(New, TUScope); 1362 CurContext = SavedContext; 1363 return New; 1364} 1365 1366/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1367/// same name and scope as a previous declaration 'Old'. Figure out 1368/// how to resolve this situation, merging decls or emitting 1369/// diagnostics as appropriate. If there was an error, set New to be invalid. 1370/// 1371void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1372 // If the new decl is known invalid already, don't bother doing any 1373 // merging checks. 1374 if (New->isInvalidDecl()) return; 1375 1376 // Allow multiple definitions for ObjC built-in typedefs. 1377 // FIXME: Verify the underlying types are equivalent! 1378 if (getLangOptions().ObjC1) { 1379 const IdentifierInfo *TypeID = New->getIdentifier(); 1380 switch (TypeID->getLength()) { 1381 default: break; 1382 case 2: 1383 if (!TypeID->isStr("id")) 1384 break; 1385 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1386 // Install the built-in type for 'id', ignoring the current definition. 1387 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1388 return; 1389 case 5: 1390 if (!TypeID->isStr("Class")) 1391 break; 1392 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1393 // Install the built-in type for 'Class', ignoring the current definition. 1394 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1395 return; 1396 case 3: 1397 if (!TypeID->isStr("SEL")) 1398 break; 1399 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1400 // Install the built-in type for 'SEL', ignoring the current definition. 1401 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1402 return; 1403 } 1404 // Fall through - the typedef name was not a builtin type. 1405 } 1406 1407 // Verify the old decl was also a type. 1408 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1409 if (!Old) { 1410 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1411 << New->getDeclName(); 1412 1413 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1414 if (OldD->getLocation().isValid()) 1415 Diag(OldD->getLocation(), diag::note_previous_definition); 1416 1417 return New->setInvalidDecl(); 1418 } 1419 1420 // If the old declaration is invalid, just give up here. 1421 if (Old->isInvalidDecl()) 1422 return New->setInvalidDecl(); 1423 1424 // Determine the "old" type we'll use for checking and diagnostics. 1425 QualType OldType; 1426 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1427 OldType = OldTypedef->getUnderlyingType(); 1428 else 1429 OldType = Context.getTypeDeclType(Old); 1430 1431 // If the typedef types are not identical, reject them in all languages and 1432 // with any extensions enabled. 1433 1434 if (OldType != New->getUnderlyingType() && 1435 Context.getCanonicalType(OldType) != 1436 Context.getCanonicalType(New->getUnderlyingType())) { 1437 int Kind = 0; 1438 if (isa<TypeAliasDecl>(Old)) 1439 Kind = 1; 1440 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1441 << Kind << New->getUnderlyingType() << OldType; 1442 if (Old->getLocation().isValid()) 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 return New->setInvalidDecl(); 1445 } 1446 1447 // The types match. Link up the redeclaration chain if the old 1448 // declaration was a typedef. 1449 // FIXME: this is a potential source of weirdness if the type 1450 // spellings don't match exactly. 1451 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1452 New->setPreviousDeclaration(Typedef); 1453 1454 // __module_private__ is propagated to later declarations. 1455 if (Old->isModulePrivate()) 1456 New->setModulePrivate(); 1457 else if (New->isModulePrivate()) 1458 diagnoseModulePrivateRedeclaration(New, Old); 1459 1460 if (getLangOptions().MicrosoftExt) 1461 return; 1462 1463 if (getLangOptions().CPlusPlus) { 1464 // C++ [dcl.typedef]p2: 1465 // In a given non-class scope, a typedef specifier can be used to 1466 // redefine the name of any type declared in that scope to refer 1467 // to the type to which it already refers. 1468 if (!isa<CXXRecordDecl>(CurContext)) 1469 return; 1470 1471 // C++0x [dcl.typedef]p4: 1472 // In a given class scope, a typedef specifier can be used to redefine 1473 // any class-name declared in that scope that is not also a typedef-name 1474 // to refer to the type to which it already refers. 1475 // 1476 // This wording came in via DR424, which was a correction to the 1477 // wording in DR56, which accidentally banned code like: 1478 // 1479 // struct S { 1480 // typedef struct A { } A; 1481 // }; 1482 // 1483 // in the C++03 standard. We implement the C++0x semantics, which 1484 // allow the above but disallow 1485 // 1486 // struct S { 1487 // typedef int I; 1488 // typedef int I; 1489 // }; 1490 // 1491 // since that was the intent of DR56. 1492 if (!isa<TypedefNameDecl>(Old)) 1493 return; 1494 1495 Diag(New->getLocation(), diag::err_redefinition) 1496 << New->getDeclName(); 1497 Diag(Old->getLocation(), diag::note_previous_definition); 1498 return New->setInvalidDecl(); 1499 } 1500 1501 // If we have a redefinition of a typedef in C, emit a warning. This warning 1502 // is normally mapped to an error, but can be controlled with 1503 // -Wtypedef-redefinition. If either the original or the redefinition is 1504 // in a system header, don't emit this for compatibility with GCC. 1505 if (getDiagnostics().getSuppressSystemWarnings() && 1506 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1507 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1508 return; 1509 1510 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1511 << New->getDeclName(); 1512 Diag(Old->getLocation(), diag::note_previous_definition); 1513 return; 1514} 1515 1516/// DeclhasAttr - returns true if decl Declaration already has the target 1517/// attribute. 1518static bool 1519DeclHasAttr(const Decl *D, const Attr *A) { 1520 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1521 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1522 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1523 if ((*i)->getKind() == A->getKind()) { 1524 if (Ann) { 1525 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1526 return true; 1527 continue; 1528 } 1529 // FIXME: Don't hardcode this check 1530 if (OA && isa<OwnershipAttr>(*i)) 1531 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1532 return true; 1533 } 1534 1535 return false; 1536} 1537 1538/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1539static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1540 ASTContext &C, bool mergeDeprecation = true) { 1541 if (!oldDecl->hasAttrs()) 1542 return; 1543 1544 bool foundAny = newDecl->hasAttrs(); 1545 1546 // Ensure that any moving of objects within the allocated map is done before 1547 // we process them. 1548 if (!foundAny) newDecl->setAttrs(AttrVec()); 1549 1550 for (specific_attr_iterator<InheritableAttr> 1551 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1552 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1553 // Ignore deprecated/unavailable/availability attributes if requested. 1554 if (!mergeDeprecation && 1555 (isa<DeprecatedAttr>(*i) || 1556 isa<UnavailableAttr>(*i) || 1557 isa<AvailabilityAttr>(*i))) 1558 continue; 1559 1560 if (!DeclHasAttr(newDecl, *i)) { 1561 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1562 newAttr->setInherited(true); 1563 newDecl->addAttr(newAttr); 1564 foundAny = true; 1565 } 1566 } 1567 1568 if (!foundAny) newDecl->dropAttrs(); 1569} 1570 1571/// mergeParamDeclAttributes - Copy attributes from the old parameter 1572/// to the new one. 1573static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1574 const ParmVarDecl *oldDecl, 1575 ASTContext &C) { 1576 if (!oldDecl->hasAttrs()) 1577 return; 1578 1579 bool foundAny = newDecl->hasAttrs(); 1580 1581 // Ensure that any moving of objects within the allocated map is 1582 // done before we process them. 1583 if (!foundAny) newDecl->setAttrs(AttrVec()); 1584 1585 for (specific_attr_iterator<InheritableParamAttr> 1586 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1587 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1588 if (!DeclHasAttr(newDecl, *i)) { 1589 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1590 newAttr->setInherited(true); 1591 newDecl->addAttr(newAttr); 1592 foundAny = true; 1593 } 1594 } 1595 1596 if (!foundAny) newDecl->dropAttrs(); 1597} 1598 1599namespace { 1600 1601/// Used in MergeFunctionDecl to keep track of function parameters in 1602/// C. 1603struct GNUCompatibleParamWarning { 1604 ParmVarDecl *OldParm; 1605 ParmVarDecl *NewParm; 1606 QualType PromotedType; 1607}; 1608 1609} 1610 1611/// getSpecialMember - get the special member enum for a method. 1612Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1613 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1614 if (Ctor->isDefaultConstructor()) 1615 return Sema::CXXDefaultConstructor; 1616 1617 if (Ctor->isCopyConstructor()) 1618 return Sema::CXXCopyConstructor; 1619 1620 if (Ctor->isMoveConstructor()) 1621 return Sema::CXXMoveConstructor; 1622 } else if (isa<CXXDestructorDecl>(MD)) { 1623 return Sema::CXXDestructor; 1624 } else if (MD->isCopyAssignmentOperator()) { 1625 return Sema::CXXCopyAssignment; 1626 } else if (MD->isMoveAssignmentOperator()) { 1627 return Sema::CXXMoveAssignment; 1628 } 1629 1630 return Sema::CXXInvalid; 1631} 1632 1633/// canRedefineFunction - checks if a function can be redefined. Currently, 1634/// only extern inline functions can be redefined, and even then only in 1635/// GNU89 mode. 1636static bool canRedefineFunction(const FunctionDecl *FD, 1637 const LangOptions& LangOpts) { 1638 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1639 !LangOpts.CPlusPlus && 1640 FD->isInlineSpecified() && 1641 FD->getStorageClass() == SC_Extern); 1642} 1643 1644/// MergeFunctionDecl - We just parsed a function 'New' from 1645/// declarator D which has the same name and scope as a previous 1646/// declaration 'Old'. Figure out how to resolve this situation, 1647/// merging decls or emitting diagnostics as appropriate. 1648/// 1649/// In C++, New and Old must be declarations that are not 1650/// overloaded. Use IsOverload to determine whether New and Old are 1651/// overloaded, and to select the Old declaration that New should be 1652/// merged with. 1653/// 1654/// Returns true if there was an error, false otherwise. 1655bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1656 // Verify the old decl was also a function. 1657 FunctionDecl *Old = 0; 1658 if (FunctionTemplateDecl *OldFunctionTemplate 1659 = dyn_cast<FunctionTemplateDecl>(OldD)) 1660 Old = OldFunctionTemplate->getTemplatedDecl(); 1661 else 1662 Old = dyn_cast<FunctionDecl>(OldD); 1663 if (!Old) { 1664 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1665 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1666 Diag(Shadow->getTargetDecl()->getLocation(), 1667 diag::note_using_decl_target); 1668 Diag(Shadow->getUsingDecl()->getLocation(), 1669 diag::note_using_decl) << 0; 1670 return true; 1671 } 1672 1673 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1674 << New->getDeclName(); 1675 Diag(OldD->getLocation(), diag::note_previous_definition); 1676 return true; 1677 } 1678 1679 // Determine whether the previous declaration was a definition, 1680 // implicit declaration, or a declaration. 1681 diag::kind PrevDiag; 1682 if (Old->isThisDeclarationADefinition()) 1683 PrevDiag = diag::note_previous_definition; 1684 else if (Old->isImplicit()) 1685 PrevDiag = diag::note_previous_implicit_declaration; 1686 else 1687 PrevDiag = diag::note_previous_declaration; 1688 1689 QualType OldQType = Context.getCanonicalType(Old->getType()); 1690 QualType NewQType = Context.getCanonicalType(New->getType()); 1691 1692 // Don't complain about this if we're in GNU89 mode and the old function 1693 // is an extern inline function. 1694 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1695 New->getStorageClass() == SC_Static && 1696 Old->getStorageClass() != SC_Static && 1697 !canRedefineFunction(Old, getLangOptions())) { 1698 if (getLangOptions().MicrosoftExt) { 1699 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1700 Diag(Old->getLocation(), PrevDiag); 1701 } else { 1702 Diag(New->getLocation(), diag::err_static_non_static) << New; 1703 Diag(Old->getLocation(), PrevDiag); 1704 return true; 1705 } 1706 } 1707 1708 // If a function is first declared with a calling convention, but is 1709 // later declared or defined without one, the second decl assumes the 1710 // calling convention of the first. 1711 // 1712 // For the new decl, we have to look at the NON-canonical type to tell the 1713 // difference between a function that really doesn't have a calling 1714 // convention and one that is declared cdecl. That's because in 1715 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1716 // because it is the default calling convention. 1717 // 1718 // Note also that we DO NOT return at this point, because we still have 1719 // other tests to run. 1720 const FunctionType *OldType = cast<FunctionType>(OldQType); 1721 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1722 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1723 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1724 bool RequiresAdjustment = false; 1725 if (OldTypeInfo.getCC() != CC_Default && 1726 NewTypeInfo.getCC() == CC_Default) { 1727 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1728 RequiresAdjustment = true; 1729 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1730 NewTypeInfo.getCC())) { 1731 // Calling conventions really aren't compatible, so complain. 1732 Diag(New->getLocation(), diag::err_cconv_change) 1733 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1734 << (OldTypeInfo.getCC() == CC_Default) 1735 << (OldTypeInfo.getCC() == CC_Default ? "" : 1736 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1737 Diag(Old->getLocation(), diag::note_previous_declaration); 1738 return true; 1739 } 1740 1741 // FIXME: diagnose the other way around? 1742 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1743 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1744 RequiresAdjustment = true; 1745 } 1746 1747 // Merge regparm attribute. 1748 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1749 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1750 if (NewTypeInfo.getHasRegParm()) { 1751 Diag(New->getLocation(), diag::err_regparm_mismatch) 1752 << NewType->getRegParmType() 1753 << OldType->getRegParmType(); 1754 Diag(Old->getLocation(), diag::note_previous_declaration); 1755 return true; 1756 } 1757 1758 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1759 RequiresAdjustment = true; 1760 } 1761 1762 // Merge ns_returns_retained attribute. 1763 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1764 if (NewTypeInfo.getProducesResult()) { 1765 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1766 Diag(Old->getLocation(), diag::note_previous_declaration); 1767 return true; 1768 } 1769 1770 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1771 RequiresAdjustment = true; 1772 } 1773 1774 if (RequiresAdjustment) { 1775 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1776 New->setType(QualType(NewType, 0)); 1777 NewQType = Context.getCanonicalType(New->getType()); 1778 } 1779 1780 if (getLangOptions().CPlusPlus) { 1781 // (C++98 13.1p2): 1782 // Certain function declarations cannot be overloaded: 1783 // -- Function declarations that differ only in the return type 1784 // cannot be overloaded. 1785 QualType OldReturnType = OldType->getResultType(); 1786 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1787 QualType ResQT; 1788 if (OldReturnType != NewReturnType) { 1789 if (NewReturnType->isObjCObjectPointerType() 1790 && OldReturnType->isObjCObjectPointerType()) 1791 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1792 if (ResQT.isNull()) { 1793 if (New->isCXXClassMember() && New->isOutOfLine()) 1794 Diag(New->getLocation(), 1795 diag::err_member_def_does_not_match_ret_type) << New; 1796 else 1797 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1798 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1799 return true; 1800 } 1801 else 1802 NewQType = ResQT; 1803 } 1804 1805 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1806 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1807 if (OldMethod && NewMethod) { 1808 // Preserve triviality. 1809 NewMethod->setTrivial(OldMethod->isTrivial()); 1810 1811 // MSVC allows explicit template specialization at class scope: 1812 // 2 CXMethodDecls referring to the same function will be injected. 1813 // We don't want a redeclartion error. 1814 bool IsClassScopeExplicitSpecialization = 1815 OldMethod->isFunctionTemplateSpecialization() && 1816 NewMethod->isFunctionTemplateSpecialization(); 1817 bool isFriend = NewMethod->getFriendObjectKind(); 1818 1819 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1820 !IsClassScopeExplicitSpecialization) { 1821 // -- Member function declarations with the same name and the 1822 // same parameter types cannot be overloaded if any of them 1823 // is a static member function declaration. 1824 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1825 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1826 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1827 return true; 1828 } 1829 1830 // C++ [class.mem]p1: 1831 // [...] A member shall not be declared twice in the 1832 // member-specification, except that a nested class or member 1833 // class template can be declared and then later defined. 1834 unsigned NewDiag; 1835 if (isa<CXXConstructorDecl>(OldMethod)) 1836 NewDiag = diag::err_constructor_redeclared; 1837 else if (isa<CXXDestructorDecl>(NewMethod)) 1838 NewDiag = diag::err_destructor_redeclared; 1839 else if (isa<CXXConversionDecl>(NewMethod)) 1840 NewDiag = diag::err_conv_function_redeclared; 1841 else 1842 NewDiag = diag::err_member_redeclared; 1843 1844 Diag(New->getLocation(), NewDiag); 1845 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1846 1847 // Complain if this is an explicit declaration of a special 1848 // member that was initially declared implicitly. 1849 // 1850 // As an exception, it's okay to befriend such methods in order 1851 // to permit the implicit constructor/destructor/operator calls. 1852 } else if (OldMethod->isImplicit()) { 1853 if (isFriend) { 1854 NewMethod->setImplicit(); 1855 } else { 1856 Diag(NewMethod->getLocation(), 1857 diag::err_definition_of_implicitly_declared_member) 1858 << New << getSpecialMember(OldMethod); 1859 return true; 1860 } 1861 } else if (OldMethod->isExplicitlyDefaulted()) { 1862 Diag(NewMethod->getLocation(), 1863 diag::err_definition_of_explicitly_defaulted_member) 1864 << getSpecialMember(OldMethod); 1865 return true; 1866 } 1867 } 1868 1869 // (C++98 8.3.5p3): 1870 // All declarations for a function shall agree exactly in both the 1871 // return type and the parameter-type-list. 1872 // We also want to respect all the extended bits except noreturn. 1873 1874 // noreturn should now match unless the old type info didn't have it. 1875 QualType OldQTypeForComparison = OldQType; 1876 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1877 assert(OldQType == QualType(OldType, 0)); 1878 const FunctionType *OldTypeForComparison 1879 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1880 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1881 assert(OldQTypeForComparison.isCanonical()); 1882 } 1883 1884 if (OldQTypeForComparison == NewQType) 1885 return MergeCompatibleFunctionDecls(New, Old); 1886 1887 // Fall through for conflicting redeclarations and redefinitions. 1888 } 1889 1890 // C: Function types need to be compatible, not identical. This handles 1891 // duplicate function decls like "void f(int); void f(enum X);" properly. 1892 if (!getLangOptions().CPlusPlus && 1893 Context.typesAreCompatible(OldQType, NewQType)) { 1894 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1895 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1896 const FunctionProtoType *OldProto = 0; 1897 if (isa<FunctionNoProtoType>(NewFuncType) && 1898 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1899 // The old declaration provided a function prototype, but the 1900 // new declaration does not. Merge in the prototype. 1901 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1902 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1903 OldProto->arg_type_end()); 1904 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1905 ParamTypes.data(), ParamTypes.size(), 1906 OldProto->getExtProtoInfo()); 1907 New->setType(NewQType); 1908 New->setHasInheritedPrototype(); 1909 1910 // Synthesize a parameter for each argument type. 1911 SmallVector<ParmVarDecl*, 16> Params; 1912 for (FunctionProtoType::arg_type_iterator 1913 ParamType = OldProto->arg_type_begin(), 1914 ParamEnd = OldProto->arg_type_end(); 1915 ParamType != ParamEnd; ++ParamType) { 1916 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1917 SourceLocation(), 1918 SourceLocation(), 0, 1919 *ParamType, /*TInfo=*/0, 1920 SC_None, SC_None, 1921 0); 1922 Param->setScopeInfo(0, Params.size()); 1923 Param->setImplicit(); 1924 Params.push_back(Param); 1925 } 1926 1927 New->setParams(Params); 1928 } 1929 1930 return MergeCompatibleFunctionDecls(New, Old); 1931 } 1932 1933 // GNU C permits a K&R definition to follow a prototype declaration 1934 // if the declared types of the parameters in the K&R definition 1935 // match the types in the prototype declaration, even when the 1936 // promoted types of the parameters from the K&R definition differ 1937 // from the types in the prototype. GCC then keeps the types from 1938 // the prototype. 1939 // 1940 // If a variadic prototype is followed by a non-variadic K&R definition, 1941 // the K&R definition becomes variadic. This is sort of an edge case, but 1942 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1943 // C99 6.9.1p8. 1944 if (!getLangOptions().CPlusPlus && 1945 Old->hasPrototype() && !New->hasPrototype() && 1946 New->getType()->getAs<FunctionProtoType>() && 1947 Old->getNumParams() == New->getNumParams()) { 1948 SmallVector<QualType, 16> ArgTypes; 1949 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1950 const FunctionProtoType *OldProto 1951 = Old->getType()->getAs<FunctionProtoType>(); 1952 const FunctionProtoType *NewProto 1953 = New->getType()->getAs<FunctionProtoType>(); 1954 1955 // Determine whether this is the GNU C extension. 1956 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1957 NewProto->getResultType()); 1958 bool LooseCompatible = !MergedReturn.isNull(); 1959 for (unsigned Idx = 0, End = Old->getNumParams(); 1960 LooseCompatible && Idx != End; ++Idx) { 1961 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1962 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1963 if (Context.typesAreCompatible(OldParm->getType(), 1964 NewProto->getArgType(Idx))) { 1965 ArgTypes.push_back(NewParm->getType()); 1966 } else if (Context.typesAreCompatible(OldParm->getType(), 1967 NewParm->getType(), 1968 /*CompareUnqualified=*/true)) { 1969 GNUCompatibleParamWarning Warn 1970 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1971 Warnings.push_back(Warn); 1972 ArgTypes.push_back(NewParm->getType()); 1973 } else 1974 LooseCompatible = false; 1975 } 1976 1977 if (LooseCompatible) { 1978 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1979 Diag(Warnings[Warn].NewParm->getLocation(), 1980 diag::ext_param_promoted_not_compatible_with_prototype) 1981 << Warnings[Warn].PromotedType 1982 << Warnings[Warn].OldParm->getType(); 1983 if (Warnings[Warn].OldParm->getLocation().isValid()) 1984 Diag(Warnings[Warn].OldParm->getLocation(), 1985 diag::note_previous_declaration); 1986 } 1987 1988 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1989 ArgTypes.size(), 1990 OldProto->getExtProtoInfo())); 1991 return MergeCompatibleFunctionDecls(New, Old); 1992 } 1993 1994 // Fall through to diagnose conflicting types. 1995 } 1996 1997 // A function that has already been declared has been redeclared or defined 1998 // with a different type- show appropriate diagnostic 1999 if (unsigned BuiltinID = Old->getBuiltinID()) { 2000 // The user has declared a builtin function with an incompatible 2001 // signature. 2002 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2003 // The function the user is redeclaring is a library-defined 2004 // function like 'malloc' or 'printf'. Warn about the 2005 // redeclaration, then pretend that we don't know about this 2006 // library built-in. 2007 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2008 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2009 << Old << Old->getType(); 2010 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2011 Old->setInvalidDecl(); 2012 return false; 2013 } 2014 2015 PrevDiag = diag::note_previous_builtin_declaration; 2016 } 2017 2018 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2019 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2020 return true; 2021} 2022 2023/// \brief Completes the merge of two function declarations that are 2024/// known to be compatible. 2025/// 2026/// This routine handles the merging of attributes and other 2027/// properties of function declarations form the old declaration to 2028/// the new declaration, once we know that New is in fact a 2029/// redeclaration of Old. 2030/// 2031/// \returns false 2032bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2033 // Merge the attributes 2034 mergeDeclAttributes(New, Old, Context); 2035 2036 // Merge the storage class. 2037 if (Old->getStorageClass() != SC_Extern && 2038 Old->getStorageClass() != SC_None) 2039 New->setStorageClass(Old->getStorageClass()); 2040 2041 // Merge "pure" flag. 2042 if (Old->isPure()) 2043 New->setPure(); 2044 2045 // __module_private__ is propagated to later declarations. 2046 if (Old->isModulePrivate()) 2047 New->setModulePrivate(); 2048 else if (New->isModulePrivate()) 2049 diagnoseModulePrivateRedeclaration(New, Old); 2050 2051 // Merge attributes from the parameters. These can mismatch with K&R 2052 // declarations. 2053 if (New->getNumParams() == Old->getNumParams()) 2054 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2055 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2056 Context); 2057 2058 if (getLangOptions().CPlusPlus) 2059 return MergeCXXFunctionDecl(New, Old); 2060 2061 return false; 2062} 2063 2064 2065void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2066 const ObjCMethodDecl *oldMethod) { 2067 // We don't want to merge unavailable and deprecated attributes 2068 // except from interface to implementation. 2069 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2070 2071 // Merge the attributes. 2072 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2073 2074 // Merge attributes from the parameters. 2075 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2076 for (ObjCMethodDecl::param_iterator 2077 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2078 ni != ne; ++ni, ++oi) 2079 mergeParamDeclAttributes(*ni, *oi, Context); 2080 2081 CheckObjCMethodOverride(newMethod, oldMethod, true); 2082} 2083 2084/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2085/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2086/// emitting diagnostics as appropriate. 2087/// 2088/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2089/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2090/// check them before the initializer is attached. 2091/// 2092void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2093 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2094 return; 2095 2096 QualType MergedT; 2097 if (getLangOptions().CPlusPlus) { 2098 AutoType *AT = New->getType()->getContainedAutoType(); 2099 if (AT && !AT->isDeduced()) { 2100 // We don't know what the new type is until the initializer is attached. 2101 return; 2102 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2103 // These could still be something that needs exception specs checked. 2104 return MergeVarDeclExceptionSpecs(New, Old); 2105 } 2106 // C++ [basic.link]p10: 2107 // [...] the types specified by all declarations referring to a given 2108 // object or function shall be identical, except that declarations for an 2109 // array object can specify array types that differ by the presence or 2110 // absence of a major array bound (8.3.4). 2111 else if (Old->getType()->isIncompleteArrayType() && 2112 New->getType()->isArrayType()) { 2113 CanQual<ArrayType> OldArray 2114 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2115 CanQual<ArrayType> NewArray 2116 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2117 if (OldArray->getElementType() == NewArray->getElementType()) 2118 MergedT = New->getType(); 2119 } else if (Old->getType()->isArrayType() && 2120 New->getType()->isIncompleteArrayType()) { 2121 CanQual<ArrayType> OldArray 2122 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2123 CanQual<ArrayType> NewArray 2124 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2125 if (OldArray->getElementType() == NewArray->getElementType()) 2126 MergedT = Old->getType(); 2127 } else if (New->getType()->isObjCObjectPointerType() 2128 && Old->getType()->isObjCObjectPointerType()) { 2129 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2130 Old->getType()); 2131 } 2132 } else { 2133 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2134 } 2135 if (MergedT.isNull()) { 2136 Diag(New->getLocation(), diag::err_redefinition_different_type) 2137 << New->getDeclName(); 2138 Diag(Old->getLocation(), diag::note_previous_definition); 2139 return New->setInvalidDecl(); 2140 } 2141 New->setType(MergedT); 2142} 2143 2144/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2145/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2146/// situation, merging decls or emitting diagnostics as appropriate. 2147/// 2148/// Tentative definition rules (C99 6.9.2p2) are checked by 2149/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2150/// definitions here, since the initializer hasn't been attached. 2151/// 2152void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2153 // If the new decl is already invalid, don't do any other checking. 2154 if (New->isInvalidDecl()) 2155 return; 2156 2157 // Verify the old decl was also a variable. 2158 VarDecl *Old = 0; 2159 if (!Previous.isSingleResult() || 2160 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2161 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2162 << New->getDeclName(); 2163 Diag(Previous.getRepresentativeDecl()->getLocation(), 2164 diag::note_previous_definition); 2165 return New->setInvalidDecl(); 2166 } 2167 2168 // C++ [class.mem]p1: 2169 // A member shall not be declared twice in the member-specification [...] 2170 // 2171 // Here, we need only consider static data members. 2172 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2173 Diag(New->getLocation(), diag::err_duplicate_member) 2174 << New->getIdentifier(); 2175 Diag(Old->getLocation(), diag::note_previous_declaration); 2176 New->setInvalidDecl(); 2177 } 2178 2179 mergeDeclAttributes(New, Old, Context); 2180 // Warn if an already-declared variable is made a weak_import in a subsequent 2181 // declaration 2182 if (New->getAttr<WeakImportAttr>() && 2183 Old->getStorageClass() == SC_None && 2184 !Old->getAttr<WeakImportAttr>()) { 2185 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2186 Diag(Old->getLocation(), diag::note_previous_definition); 2187 // Remove weak_import attribute on new declaration. 2188 New->dropAttr<WeakImportAttr>(); 2189 } 2190 2191 // Merge the types. 2192 MergeVarDeclTypes(New, Old); 2193 if (New->isInvalidDecl()) 2194 return; 2195 2196 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2197 if (New->getStorageClass() == SC_Static && 2198 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2199 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2200 Diag(Old->getLocation(), diag::note_previous_definition); 2201 return New->setInvalidDecl(); 2202 } 2203 // C99 6.2.2p4: 2204 // For an identifier declared with the storage-class specifier 2205 // extern in a scope in which a prior declaration of that 2206 // identifier is visible,23) if the prior declaration specifies 2207 // internal or external linkage, the linkage of the identifier at 2208 // the later declaration is the same as the linkage specified at 2209 // the prior declaration. If no prior declaration is visible, or 2210 // if the prior declaration specifies no linkage, then the 2211 // identifier has external linkage. 2212 if (New->hasExternalStorage() && Old->hasLinkage()) 2213 /* Okay */; 2214 else if (New->getStorageClass() != SC_Static && 2215 Old->getStorageClass() == SC_Static) { 2216 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2217 Diag(Old->getLocation(), diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 2221 // Check if extern is followed by non-extern and vice-versa. 2222 if (New->hasExternalStorage() && 2223 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2224 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2225 Diag(Old->getLocation(), diag::note_previous_definition); 2226 return New->setInvalidDecl(); 2227 } 2228 if (Old->hasExternalStorage() && 2229 !New->hasLinkage() && New->isLocalVarDecl()) { 2230 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2231 Diag(Old->getLocation(), diag::note_previous_definition); 2232 return New->setInvalidDecl(); 2233 } 2234 2235 // __module_private__ is propagated to later declarations. 2236 if (Old->isModulePrivate()) 2237 New->setModulePrivate(); 2238 else if (New->isModulePrivate()) 2239 diagnoseModulePrivateRedeclaration(New, Old); 2240 2241 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2242 2243 // FIXME: The test for external storage here seems wrong? We still 2244 // need to check for mismatches. 2245 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2246 // Don't complain about out-of-line definitions of static members. 2247 !(Old->getLexicalDeclContext()->isRecord() && 2248 !New->getLexicalDeclContext()->isRecord())) { 2249 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2250 Diag(Old->getLocation(), diag::note_previous_definition); 2251 return New->setInvalidDecl(); 2252 } 2253 2254 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2255 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2256 Diag(Old->getLocation(), diag::note_previous_definition); 2257 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2258 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2259 Diag(Old->getLocation(), diag::note_previous_definition); 2260 } 2261 2262 // C++ doesn't have tentative definitions, so go right ahead and check here. 2263 const VarDecl *Def; 2264 if (getLangOptions().CPlusPlus && 2265 New->isThisDeclarationADefinition() == VarDecl::Definition && 2266 (Def = Old->getDefinition())) { 2267 Diag(New->getLocation(), diag::err_redefinition) 2268 << New->getDeclName(); 2269 Diag(Def->getLocation(), diag::note_previous_definition); 2270 New->setInvalidDecl(); 2271 return; 2272 } 2273 // c99 6.2.2 P4. 2274 // For an identifier declared with the storage-class specifier extern in a 2275 // scope in which a prior declaration of that identifier is visible, if 2276 // the prior declaration specifies internal or external linkage, the linkage 2277 // of the identifier at the later declaration is the same as the linkage 2278 // specified at the prior declaration. 2279 // FIXME. revisit this code. 2280 if (New->hasExternalStorage() && 2281 Old->getLinkage() == InternalLinkage && 2282 New->getDeclContext() == Old->getDeclContext()) 2283 New->setStorageClass(Old->getStorageClass()); 2284 2285 // Keep a chain of previous declarations. 2286 New->setPreviousDeclaration(Old); 2287 2288 // Inherit access appropriately. 2289 New->setAccess(Old->getAccess()); 2290} 2291 2292/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2293/// no declarator (e.g. "struct foo;") is parsed. 2294Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2295 DeclSpec &DS) { 2296 return ParsedFreeStandingDeclSpec(S, AS, DS, 2297 MultiTemplateParamsArg(*this, 0, 0)); 2298} 2299 2300/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2301/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2302/// parameters to cope with template friend declarations. 2303Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2304 DeclSpec &DS, 2305 MultiTemplateParamsArg TemplateParams) { 2306 Decl *TagD = 0; 2307 TagDecl *Tag = 0; 2308 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2309 DS.getTypeSpecType() == DeclSpec::TST_struct || 2310 DS.getTypeSpecType() == DeclSpec::TST_union || 2311 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2312 TagD = DS.getRepAsDecl(); 2313 2314 if (!TagD) // We probably had an error 2315 return 0; 2316 2317 // Note that the above type specs guarantee that the 2318 // type rep is a Decl, whereas in many of the others 2319 // it's a Type. 2320 if (isa<TagDecl>(TagD)) 2321 Tag = cast<TagDecl>(TagD); 2322 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2323 Tag = CTD->getTemplatedDecl(); 2324 } 2325 2326 if (Tag) 2327 Tag->setFreeStanding(); 2328 2329 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2330 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2331 // or incomplete types shall not be restrict-qualified." 2332 if (TypeQuals & DeclSpec::TQ_restrict) 2333 Diag(DS.getRestrictSpecLoc(), 2334 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2335 << DS.getSourceRange(); 2336 } 2337 2338 if (DS.isConstexprSpecified()) { 2339 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2340 // and definitions of functions and variables. 2341 if (Tag) 2342 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2343 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2344 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2345 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2346 else 2347 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2348 // Don't emit warnings after this error. 2349 return TagD; 2350 } 2351 2352 if (DS.isFriendSpecified()) { 2353 // If we're dealing with a decl but not a TagDecl, assume that 2354 // whatever routines created it handled the friendship aspect. 2355 if (TagD && !Tag) 2356 return 0; 2357 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2358 } 2359 2360 // Track whether we warned about the fact that there aren't any 2361 // declarators. 2362 bool emittedWarning = false; 2363 2364 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2365 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2366 2367 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2368 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2369 if (getLangOptions().CPlusPlus || 2370 Record->getDeclContext()->isRecord()) 2371 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2372 2373 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2374 << DS.getSourceRange(); 2375 emittedWarning = true; 2376 } 2377 } 2378 2379 // Check for Microsoft C extension: anonymous struct. 2380 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2381 CurContext->isRecord() && 2382 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2383 // Handle 2 kinds of anonymous struct: 2384 // struct STRUCT; 2385 // and 2386 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2387 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2388 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2389 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2390 DS.getRepAsType().get()->isStructureType())) { 2391 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2392 << DS.getSourceRange(); 2393 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2394 } 2395 } 2396 2397 if (getLangOptions().CPlusPlus && 2398 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2399 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2400 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2401 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2402 Diag(Enum->getLocation(), diag::ext_no_declarators) 2403 << DS.getSourceRange(); 2404 emittedWarning = true; 2405 } 2406 2407 // Skip all the checks below if we have a type error. 2408 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2409 2410 if (!DS.isMissingDeclaratorOk()) { 2411 // Warn about typedefs of enums without names, since this is an 2412 // extension in both Microsoft and GNU. 2413 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2414 Tag && isa<EnumDecl>(Tag)) { 2415 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2416 << DS.getSourceRange(); 2417 return Tag; 2418 } 2419 2420 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2421 << DS.getSourceRange(); 2422 emittedWarning = true; 2423 } 2424 2425 // We're going to complain about a bunch of spurious specifiers; 2426 // only do this if we're declaring a tag, because otherwise we 2427 // should be getting diag::ext_no_declarators. 2428 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2429 return TagD; 2430 2431 // Note that a linkage-specification sets a storage class, but 2432 // 'extern "C" struct foo;' is actually valid and not theoretically 2433 // useless. 2434 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2435 if (!DS.isExternInLinkageSpec()) 2436 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2437 << DeclSpec::getSpecifierName(scs); 2438 2439 if (DS.isThreadSpecified()) 2440 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2441 if (DS.getTypeQualifiers()) { 2442 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2443 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2444 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2445 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2446 // Restrict is covered above. 2447 } 2448 if (DS.isInlineSpecified()) 2449 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2450 if (DS.isVirtualSpecified()) 2451 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2452 if (DS.isExplicitSpecified()) 2453 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2454 2455 if (DS.isModulePrivateSpecified() && 2456 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2457 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2458 << Tag->getTagKind() 2459 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2460 2461 // FIXME: Warn on useless attributes 2462 2463 return TagD; 2464} 2465 2466/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2467/// builds a statement for it and returns it so it is evaluated. 2468StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2469 StmtResult R; 2470 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2471 Expr *Exp = DS.getRepAsExpr(); 2472 QualType Ty = Exp->getType(); 2473 if (Ty->isPointerType()) { 2474 do 2475 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2476 while (Ty->isPointerType()); 2477 } 2478 if (Ty->isVariableArrayType()) { 2479 R = ActOnExprStmt(MakeFullExpr(Exp)); 2480 } 2481 } 2482 return R; 2483} 2484 2485/// We are trying to inject an anonymous member into the given scope; 2486/// check if there's an existing declaration that can't be overloaded. 2487/// 2488/// \return true if this is a forbidden redeclaration 2489static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2490 Scope *S, 2491 DeclContext *Owner, 2492 DeclarationName Name, 2493 SourceLocation NameLoc, 2494 unsigned diagnostic) { 2495 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2496 Sema::ForRedeclaration); 2497 if (!SemaRef.LookupName(R, S)) return false; 2498 2499 if (R.getAsSingle<TagDecl>()) 2500 return false; 2501 2502 // Pick a representative declaration. 2503 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2504 assert(PrevDecl && "Expected a non-null Decl"); 2505 2506 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2507 return false; 2508 2509 SemaRef.Diag(NameLoc, diagnostic) << Name; 2510 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2511 2512 return true; 2513} 2514 2515/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2516/// anonymous struct or union AnonRecord into the owning context Owner 2517/// and scope S. This routine will be invoked just after we realize 2518/// that an unnamed union or struct is actually an anonymous union or 2519/// struct, e.g., 2520/// 2521/// @code 2522/// union { 2523/// int i; 2524/// float f; 2525/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2526/// // f into the surrounding scope.x 2527/// @endcode 2528/// 2529/// This routine is recursive, injecting the names of nested anonymous 2530/// structs/unions into the owning context and scope as well. 2531static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2532 DeclContext *Owner, 2533 RecordDecl *AnonRecord, 2534 AccessSpecifier AS, 2535 SmallVector<NamedDecl*, 2> &Chaining, 2536 bool MSAnonStruct) { 2537 unsigned diagKind 2538 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2539 : diag::err_anonymous_struct_member_redecl; 2540 2541 bool Invalid = false; 2542 2543 // Look every FieldDecl and IndirectFieldDecl with a name. 2544 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2545 DEnd = AnonRecord->decls_end(); 2546 D != DEnd; ++D) { 2547 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2548 cast<NamedDecl>(*D)->getDeclName()) { 2549 ValueDecl *VD = cast<ValueDecl>(*D); 2550 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2551 VD->getLocation(), diagKind)) { 2552 // C++ [class.union]p2: 2553 // The names of the members of an anonymous union shall be 2554 // distinct from the names of any other entity in the 2555 // scope in which the anonymous union is declared. 2556 Invalid = true; 2557 } else { 2558 // C++ [class.union]p2: 2559 // For the purpose of name lookup, after the anonymous union 2560 // definition, the members of the anonymous union are 2561 // considered to have been defined in the scope in which the 2562 // anonymous union is declared. 2563 unsigned OldChainingSize = Chaining.size(); 2564 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2565 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2566 PE = IF->chain_end(); PI != PE; ++PI) 2567 Chaining.push_back(*PI); 2568 else 2569 Chaining.push_back(VD); 2570 2571 assert(Chaining.size() >= 2); 2572 NamedDecl **NamedChain = 2573 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2574 for (unsigned i = 0; i < Chaining.size(); i++) 2575 NamedChain[i] = Chaining[i]; 2576 2577 IndirectFieldDecl* IndirectField = 2578 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2579 VD->getIdentifier(), VD->getType(), 2580 NamedChain, Chaining.size()); 2581 2582 IndirectField->setAccess(AS); 2583 IndirectField->setImplicit(); 2584 SemaRef.PushOnScopeChains(IndirectField, S); 2585 2586 // That includes picking up the appropriate access specifier. 2587 if (AS != AS_none) IndirectField->setAccess(AS); 2588 2589 Chaining.resize(OldChainingSize); 2590 } 2591 } 2592 } 2593 2594 return Invalid; 2595} 2596 2597/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2598/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2599/// illegal input values are mapped to SC_None. 2600static StorageClass 2601StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2602 switch (StorageClassSpec) { 2603 case DeclSpec::SCS_unspecified: return SC_None; 2604 case DeclSpec::SCS_extern: return SC_Extern; 2605 case DeclSpec::SCS_static: return SC_Static; 2606 case DeclSpec::SCS_auto: return SC_Auto; 2607 case DeclSpec::SCS_register: return SC_Register; 2608 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2609 // Illegal SCSs map to None: error reporting is up to the caller. 2610 case DeclSpec::SCS_mutable: // Fall through. 2611 case DeclSpec::SCS_typedef: return SC_None; 2612 } 2613 llvm_unreachable("unknown storage class specifier"); 2614} 2615 2616/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2617/// a StorageClass. Any error reporting is up to the caller: 2618/// illegal input values are mapped to SC_None. 2619static StorageClass 2620StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2621 switch (StorageClassSpec) { 2622 case DeclSpec::SCS_unspecified: return SC_None; 2623 case DeclSpec::SCS_extern: return SC_Extern; 2624 case DeclSpec::SCS_static: return SC_Static; 2625 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2626 // Illegal SCSs map to None: error reporting is up to the caller. 2627 case DeclSpec::SCS_auto: // Fall through. 2628 case DeclSpec::SCS_mutable: // Fall through. 2629 case DeclSpec::SCS_register: // Fall through. 2630 case DeclSpec::SCS_typedef: return SC_None; 2631 } 2632 llvm_unreachable("unknown storage class specifier"); 2633} 2634 2635/// BuildAnonymousStructOrUnion - Handle the declaration of an 2636/// anonymous structure or union. Anonymous unions are a C++ feature 2637/// (C++ [class.union]) and a GNU C extension; anonymous structures 2638/// are a GNU C and GNU C++ extension. 2639Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2640 AccessSpecifier AS, 2641 RecordDecl *Record) { 2642 DeclContext *Owner = Record->getDeclContext(); 2643 2644 // Diagnose whether this anonymous struct/union is an extension. 2645 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2646 Diag(Record->getLocation(), diag::ext_anonymous_union); 2647 else if (!Record->isUnion()) 2648 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2649 2650 // C and C++ require different kinds of checks for anonymous 2651 // structs/unions. 2652 bool Invalid = false; 2653 if (getLangOptions().CPlusPlus) { 2654 const char* PrevSpec = 0; 2655 unsigned DiagID; 2656 if (Record->isUnion()) { 2657 // C++ [class.union]p6: 2658 // Anonymous unions declared in a named namespace or in the 2659 // global namespace shall be declared static. 2660 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2661 (isa<TranslationUnitDecl>(Owner) || 2662 (isa<NamespaceDecl>(Owner) && 2663 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2664 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2665 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2666 2667 // Recover by adding 'static'. 2668 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2669 PrevSpec, DiagID); 2670 } 2671 // C++ [class.union]p6: 2672 // A storage class is not allowed in a declaration of an 2673 // anonymous union in a class scope. 2674 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2675 isa<RecordDecl>(Owner)) { 2676 Diag(DS.getStorageClassSpecLoc(), 2677 diag::err_anonymous_union_with_storage_spec) 2678 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2679 2680 // Recover by removing the storage specifier. 2681 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2682 SourceLocation(), 2683 PrevSpec, DiagID); 2684 } 2685 } 2686 2687 // Ignore const/volatile/restrict qualifiers. 2688 if (DS.getTypeQualifiers()) { 2689 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2690 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2691 << Record->isUnion() << 0 2692 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2693 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2694 Diag(DS.getVolatileSpecLoc(), 2695 diag::ext_anonymous_struct_union_qualified) 2696 << Record->isUnion() << 1 2697 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2698 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2699 Diag(DS.getRestrictSpecLoc(), 2700 diag::ext_anonymous_struct_union_qualified) 2701 << Record->isUnion() << 2 2702 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2703 2704 DS.ClearTypeQualifiers(); 2705 } 2706 2707 // C++ [class.union]p2: 2708 // The member-specification of an anonymous union shall only 2709 // define non-static data members. [Note: nested types and 2710 // functions cannot be declared within an anonymous union. ] 2711 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2712 MemEnd = Record->decls_end(); 2713 Mem != MemEnd; ++Mem) { 2714 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2715 // C++ [class.union]p3: 2716 // An anonymous union shall not have private or protected 2717 // members (clause 11). 2718 assert(FD->getAccess() != AS_none); 2719 if (FD->getAccess() != AS_public) { 2720 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2721 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2722 Invalid = true; 2723 } 2724 2725 // C++ [class.union]p1 2726 // An object of a class with a non-trivial constructor, a non-trivial 2727 // copy constructor, a non-trivial destructor, or a non-trivial copy 2728 // assignment operator cannot be a member of a union, nor can an 2729 // array of such objects. 2730 if (CheckNontrivialField(FD)) 2731 Invalid = true; 2732 } else if ((*Mem)->isImplicit()) { 2733 // Any implicit members are fine. 2734 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2735 // This is a type that showed up in an 2736 // elaborated-type-specifier inside the anonymous struct or 2737 // union, but which actually declares a type outside of the 2738 // anonymous struct or union. It's okay. 2739 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2740 if (!MemRecord->isAnonymousStructOrUnion() && 2741 MemRecord->getDeclName()) { 2742 // Visual C++ allows type definition in anonymous struct or union. 2743 if (getLangOptions().MicrosoftExt) 2744 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2745 << (int)Record->isUnion(); 2746 else { 2747 // This is a nested type declaration. 2748 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2749 << (int)Record->isUnion(); 2750 Invalid = true; 2751 } 2752 } 2753 } else if (isa<AccessSpecDecl>(*Mem)) { 2754 // Any access specifier is fine. 2755 } else { 2756 // We have something that isn't a non-static data 2757 // member. Complain about it. 2758 unsigned DK = diag::err_anonymous_record_bad_member; 2759 if (isa<TypeDecl>(*Mem)) 2760 DK = diag::err_anonymous_record_with_type; 2761 else if (isa<FunctionDecl>(*Mem)) 2762 DK = diag::err_anonymous_record_with_function; 2763 else if (isa<VarDecl>(*Mem)) 2764 DK = diag::err_anonymous_record_with_static; 2765 2766 // Visual C++ allows type definition in anonymous struct or union. 2767 if (getLangOptions().MicrosoftExt && 2768 DK == diag::err_anonymous_record_with_type) 2769 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2770 << (int)Record->isUnion(); 2771 else { 2772 Diag((*Mem)->getLocation(), DK) 2773 << (int)Record->isUnion(); 2774 Invalid = true; 2775 } 2776 } 2777 } 2778 } 2779 2780 if (!Record->isUnion() && !Owner->isRecord()) { 2781 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2782 << (int)getLangOptions().CPlusPlus; 2783 Invalid = true; 2784 } 2785 2786 // Mock up a declarator. 2787 Declarator Dc(DS, Declarator::MemberContext); 2788 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2789 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2790 2791 // Create a declaration for this anonymous struct/union. 2792 NamedDecl *Anon = 0; 2793 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2794 Anon = FieldDecl::Create(Context, OwningClass, 2795 DS.getSourceRange().getBegin(), 2796 Record->getLocation(), 2797 /*IdentifierInfo=*/0, 2798 Context.getTypeDeclType(Record), 2799 TInfo, 2800 /*BitWidth=*/0, /*Mutable=*/false, 2801 /*HasInit=*/false); 2802 Anon->setAccess(AS); 2803 if (getLangOptions().CPlusPlus) 2804 FieldCollector->Add(cast<FieldDecl>(Anon)); 2805 } else { 2806 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2807 assert(SCSpec != DeclSpec::SCS_typedef && 2808 "Parser allowed 'typedef' as storage class VarDecl."); 2809 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2810 if (SCSpec == DeclSpec::SCS_mutable) { 2811 // mutable can only appear on non-static class members, so it's always 2812 // an error here 2813 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2814 Invalid = true; 2815 SC = SC_None; 2816 } 2817 SCSpec = DS.getStorageClassSpecAsWritten(); 2818 VarDecl::StorageClass SCAsWritten 2819 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2820 2821 Anon = VarDecl::Create(Context, Owner, 2822 DS.getSourceRange().getBegin(), 2823 Record->getLocation(), /*IdentifierInfo=*/0, 2824 Context.getTypeDeclType(Record), 2825 TInfo, SC, SCAsWritten); 2826 2827 // Default-initialize the implicit variable. This initialization will be 2828 // trivial in almost all cases, except if a union member has an in-class 2829 // initializer: 2830 // union { int n = 0; }; 2831 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2832 } 2833 Anon->setImplicit(); 2834 2835 // Add the anonymous struct/union object to the current 2836 // context. We'll be referencing this object when we refer to one of 2837 // its members. 2838 Owner->addDecl(Anon); 2839 2840 // Inject the members of the anonymous struct/union into the owning 2841 // context and into the identifier resolver chain for name lookup 2842 // purposes. 2843 SmallVector<NamedDecl*, 2> Chain; 2844 Chain.push_back(Anon); 2845 2846 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2847 Chain, false)) 2848 Invalid = true; 2849 2850 // Mark this as an anonymous struct/union type. Note that we do not 2851 // do this until after we have already checked and injected the 2852 // members of this anonymous struct/union type, because otherwise 2853 // the members could be injected twice: once by DeclContext when it 2854 // builds its lookup table, and once by 2855 // InjectAnonymousStructOrUnionMembers. 2856 Record->setAnonymousStructOrUnion(true); 2857 2858 if (Invalid) 2859 Anon->setInvalidDecl(); 2860 2861 return Anon; 2862} 2863 2864/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2865/// Microsoft C anonymous structure. 2866/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2867/// Example: 2868/// 2869/// struct A { int a; }; 2870/// struct B { struct A; int b; }; 2871/// 2872/// void foo() { 2873/// B var; 2874/// var.a = 3; 2875/// } 2876/// 2877Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2878 RecordDecl *Record) { 2879 2880 // If there is no Record, get the record via the typedef. 2881 if (!Record) 2882 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2883 2884 // Mock up a declarator. 2885 Declarator Dc(DS, Declarator::TypeNameContext); 2886 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2887 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2888 2889 // Create a declaration for this anonymous struct. 2890 NamedDecl* Anon = FieldDecl::Create(Context, 2891 cast<RecordDecl>(CurContext), 2892 DS.getSourceRange().getBegin(), 2893 DS.getSourceRange().getBegin(), 2894 /*IdentifierInfo=*/0, 2895 Context.getTypeDeclType(Record), 2896 TInfo, 2897 /*BitWidth=*/0, /*Mutable=*/false, 2898 /*HasInit=*/false); 2899 Anon->setImplicit(); 2900 2901 // Add the anonymous struct object to the current context. 2902 CurContext->addDecl(Anon); 2903 2904 // Inject the members of the anonymous struct into the current 2905 // context and into the identifier resolver chain for name lookup 2906 // purposes. 2907 SmallVector<NamedDecl*, 2> Chain; 2908 Chain.push_back(Anon); 2909 2910 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2911 Record->getDefinition(), 2912 AS_none, Chain, true)) 2913 Anon->setInvalidDecl(); 2914 2915 return Anon; 2916} 2917 2918/// GetNameForDeclarator - Determine the full declaration name for the 2919/// given Declarator. 2920DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2921 return GetNameFromUnqualifiedId(D.getName()); 2922} 2923 2924/// \brief Retrieves the declaration name from a parsed unqualified-id. 2925DeclarationNameInfo 2926Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2927 DeclarationNameInfo NameInfo; 2928 NameInfo.setLoc(Name.StartLocation); 2929 2930 switch (Name.getKind()) { 2931 2932 case UnqualifiedId::IK_ImplicitSelfParam: 2933 case UnqualifiedId::IK_Identifier: 2934 NameInfo.setName(Name.Identifier); 2935 NameInfo.setLoc(Name.StartLocation); 2936 return NameInfo; 2937 2938 case UnqualifiedId::IK_OperatorFunctionId: 2939 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2940 Name.OperatorFunctionId.Operator)); 2941 NameInfo.setLoc(Name.StartLocation); 2942 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2943 = Name.OperatorFunctionId.SymbolLocations[0]; 2944 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2945 = Name.EndLocation.getRawEncoding(); 2946 return NameInfo; 2947 2948 case UnqualifiedId::IK_LiteralOperatorId: 2949 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2950 Name.Identifier)); 2951 NameInfo.setLoc(Name.StartLocation); 2952 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2953 return NameInfo; 2954 2955 case UnqualifiedId::IK_ConversionFunctionId: { 2956 TypeSourceInfo *TInfo; 2957 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2958 if (Ty.isNull()) 2959 return DeclarationNameInfo(); 2960 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2961 Context.getCanonicalType(Ty))); 2962 NameInfo.setLoc(Name.StartLocation); 2963 NameInfo.setNamedTypeInfo(TInfo); 2964 return NameInfo; 2965 } 2966 2967 case UnqualifiedId::IK_ConstructorName: { 2968 TypeSourceInfo *TInfo; 2969 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2970 if (Ty.isNull()) 2971 return DeclarationNameInfo(); 2972 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2973 Context.getCanonicalType(Ty))); 2974 NameInfo.setLoc(Name.StartLocation); 2975 NameInfo.setNamedTypeInfo(TInfo); 2976 return NameInfo; 2977 } 2978 2979 case UnqualifiedId::IK_ConstructorTemplateId: { 2980 // In well-formed code, we can only have a constructor 2981 // template-id that refers to the current context, so go there 2982 // to find the actual type being constructed. 2983 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2984 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2985 return DeclarationNameInfo(); 2986 2987 // Determine the type of the class being constructed. 2988 QualType CurClassType = Context.getTypeDeclType(CurClass); 2989 2990 // FIXME: Check two things: that the template-id names the same type as 2991 // CurClassType, and that the template-id does not occur when the name 2992 // was qualified. 2993 2994 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2995 Context.getCanonicalType(CurClassType))); 2996 NameInfo.setLoc(Name.StartLocation); 2997 // FIXME: should we retrieve TypeSourceInfo? 2998 NameInfo.setNamedTypeInfo(0); 2999 return NameInfo; 3000 } 3001 3002 case UnqualifiedId::IK_DestructorName: { 3003 TypeSourceInfo *TInfo; 3004 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3005 if (Ty.isNull()) 3006 return DeclarationNameInfo(); 3007 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3008 Context.getCanonicalType(Ty))); 3009 NameInfo.setLoc(Name.StartLocation); 3010 NameInfo.setNamedTypeInfo(TInfo); 3011 return NameInfo; 3012 } 3013 3014 case UnqualifiedId::IK_TemplateId: { 3015 TemplateName TName = Name.TemplateId->Template.get(); 3016 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3017 return Context.getNameForTemplate(TName, TNameLoc); 3018 } 3019 3020 } // switch (Name.getKind()) 3021 3022 llvm_unreachable("Unknown name kind"); 3023} 3024 3025static QualType getCoreType(QualType Ty) { 3026 do { 3027 if (Ty->isPointerType() || Ty->isReferenceType()) 3028 Ty = Ty->getPointeeType(); 3029 else if (Ty->isArrayType()) 3030 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3031 else 3032 return Ty.withoutLocalFastQualifiers(); 3033 } while (true); 3034} 3035 3036/// hasSimilarParameters - Determine whether the C++ functions Declaration 3037/// and Definition have "nearly" matching parameters. This heuristic is 3038/// used to improve diagnostics in the case where an out-of-line function 3039/// definition doesn't match any declaration within the class or namespace. 3040/// Also sets Params to the list of indices to the parameters that differ 3041/// between the declaration and the definition. If hasSimilarParameters 3042/// returns true and Params is empty, then all of the parameters match. 3043static bool hasSimilarParameters(ASTContext &Context, 3044 FunctionDecl *Declaration, 3045 FunctionDecl *Definition, 3046 llvm::SmallVectorImpl<unsigned> &Params) { 3047 Params.clear(); 3048 if (Declaration->param_size() != Definition->param_size()) 3049 return false; 3050 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3051 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3052 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3053 3054 // The parameter types are identical 3055 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3056 continue; 3057 3058 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3059 QualType DefParamBaseTy = getCoreType(DefParamTy); 3060 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3061 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3062 3063 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3064 (DeclTyName && DeclTyName == DefTyName)) 3065 Params.push_back(Idx); 3066 else // The two parameters aren't even close 3067 return false; 3068 } 3069 3070 return true; 3071} 3072 3073/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3074/// declarator needs to be rebuilt in the current instantiation. 3075/// Any bits of declarator which appear before the name are valid for 3076/// consideration here. That's specifically the type in the decl spec 3077/// and the base type in any member-pointer chunks. 3078static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3079 DeclarationName Name) { 3080 // The types we specifically need to rebuild are: 3081 // - typenames, typeofs, and decltypes 3082 // - types which will become injected class names 3083 // Of course, we also need to rebuild any type referencing such a 3084 // type. It's safest to just say "dependent", but we call out a 3085 // few cases here. 3086 3087 DeclSpec &DS = D.getMutableDeclSpec(); 3088 switch (DS.getTypeSpecType()) { 3089 case DeclSpec::TST_typename: 3090 case DeclSpec::TST_typeofType: 3091 case DeclSpec::TST_decltype: 3092 case DeclSpec::TST_underlyingType: 3093 case DeclSpec::TST_atomic: { 3094 // Grab the type from the parser. 3095 TypeSourceInfo *TSI = 0; 3096 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3097 if (T.isNull() || !T->isDependentType()) break; 3098 3099 // Make sure there's a type source info. This isn't really much 3100 // of a waste; most dependent types should have type source info 3101 // attached already. 3102 if (!TSI) 3103 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3104 3105 // Rebuild the type in the current instantiation. 3106 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3107 if (!TSI) return true; 3108 3109 // Store the new type back in the decl spec. 3110 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3111 DS.UpdateTypeRep(LocType); 3112 break; 3113 } 3114 3115 case DeclSpec::TST_typeofExpr: { 3116 Expr *E = DS.getRepAsExpr(); 3117 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3118 if (Result.isInvalid()) return true; 3119 DS.UpdateExprRep(Result.get()); 3120 break; 3121 } 3122 3123 default: 3124 // Nothing to do for these decl specs. 3125 break; 3126 } 3127 3128 // It doesn't matter what order we do this in. 3129 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3130 DeclaratorChunk &Chunk = D.getTypeObject(I); 3131 3132 // The only type information in the declarator which can come 3133 // before the declaration name is the base type of a member 3134 // pointer. 3135 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3136 continue; 3137 3138 // Rebuild the scope specifier in-place. 3139 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3140 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3141 return true; 3142 } 3143 3144 return false; 3145} 3146 3147Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3148 D.setFunctionDefinitionKind(FDK_Declaration); 3149 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3150} 3151 3152/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3153/// If T is the name of a class, then each of the following shall have a 3154/// name different from T: 3155/// - every static data member of class T; 3156/// - every member function of class T 3157/// - every member of class T that is itself a type; 3158/// \returns true if the declaration name violates these rules. 3159bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3160 DeclarationNameInfo NameInfo) { 3161 DeclarationName Name = NameInfo.getName(); 3162 3163 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3164 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3165 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3166 return true; 3167 } 3168 3169 return false; 3170} 3171 3172Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3173 MultiTemplateParamsArg TemplateParamLists) { 3174 // TODO: consider using NameInfo for diagnostic. 3175 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3176 DeclarationName Name = NameInfo.getName(); 3177 3178 // All of these full declarators require an identifier. If it doesn't have 3179 // one, the ParsedFreeStandingDeclSpec action should be used. 3180 if (!Name) { 3181 if (!D.isInvalidType()) // Reject this if we think it is valid. 3182 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3183 diag::err_declarator_need_ident) 3184 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3185 return 0; 3186 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3187 return 0; 3188 3189 // The scope passed in may not be a decl scope. Zip up the scope tree until 3190 // we find one that is. 3191 while ((S->getFlags() & Scope::DeclScope) == 0 || 3192 (S->getFlags() & Scope::TemplateParamScope) != 0) 3193 S = S->getParent(); 3194 3195 DeclContext *DC = CurContext; 3196 if (D.getCXXScopeSpec().isInvalid()) 3197 D.setInvalidType(); 3198 else if (D.getCXXScopeSpec().isSet()) { 3199 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3200 UPPC_DeclarationQualifier)) 3201 return 0; 3202 3203 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3204 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3205 if (!DC) { 3206 // If we could not compute the declaration context, it's because the 3207 // declaration context is dependent but does not refer to a class, 3208 // class template, or class template partial specialization. Complain 3209 // and return early, to avoid the coming semantic disaster. 3210 Diag(D.getIdentifierLoc(), 3211 diag::err_template_qualified_declarator_no_match) 3212 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3213 << D.getCXXScopeSpec().getRange(); 3214 return 0; 3215 } 3216 bool IsDependentContext = DC->isDependentContext(); 3217 3218 if (!IsDependentContext && 3219 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3220 return 0; 3221 3222 if (isa<CXXRecordDecl>(DC)) { 3223 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3224 Diag(D.getIdentifierLoc(), 3225 diag::err_member_def_undefined_record) 3226 << Name << DC << D.getCXXScopeSpec().getRange(); 3227 D.setInvalidType(); 3228 } else if (isa<CXXRecordDecl>(CurContext) && 3229 !D.getDeclSpec().isFriendSpecified()) { 3230 // The user provided a superfluous scope specifier inside a class 3231 // definition: 3232 // 3233 // class X { 3234 // void X::f(); 3235 // }; 3236 if (CurContext->Equals(DC)) { 3237 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3238 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3239 } else { 3240 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3241 << Name << D.getCXXScopeSpec().getRange(); 3242 3243 // C++ constructors and destructors with incorrect scopes can break 3244 // our AST invariants by having the wrong underlying types. If 3245 // that's the case, then drop this declaration entirely. 3246 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3247 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3248 !Context.hasSameType(Name.getCXXNameType(), 3249 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3250 return 0; 3251 } 3252 3253 // Pretend that this qualifier was not here. 3254 D.getCXXScopeSpec().clear(); 3255 } 3256 } 3257 3258 // Check whether we need to rebuild the type of the given 3259 // declaration in the current instantiation. 3260 if (EnteringContext && IsDependentContext && 3261 TemplateParamLists.size() != 0) { 3262 ContextRAII SavedContext(*this, DC); 3263 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3264 D.setInvalidType(); 3265 } 3266 } 3267 3268 if (DiagnoseClassNameShadow(DC, NameInfo)) 3269 // If this is a typedef, we'll end up spewing multiple diagnostics. 3270 // Just return early; it's safer. 3271 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3272 return 0; 3273 3274 NamedDecl *New; 3275 3276 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3277 QualType R = TInfo->getType(); 3278 3279 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3280 UPPC_DeclarationType)) 3281 D.setInvalidType(); 3282 3283 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3284 ForRedeclaration); 3285 3286 // See if this is a redefinition of a variable in the same scope. 3287 if (!D.getCXXScopeSpec().isSet()) { 3288 bool IsLinkageLookup = false; 3289 3290 // If the declaration we're planning to build will be a function 3291 // or object with linkage, then look for another declaration with 3292 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3293 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3294 /* Do nothing*/; 3295 else if (R->isFunctionType()) { 3296 if (CurContext->isFunctionOrMethod() || 3297 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3298 IsLinkageLookup = true; 3299 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3300 IsLinkageLookup = true; 3301 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3302 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3303 IsLinkageLookup = true; 3304 3305 if (IsLinkageLookup) 3306 Previous.clear(LookupRedeclarationWithLinkage); 3307 3308 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3309 } else { // Something like "int foo::x;" 3310 LookupQualifiedName(Previous, DC); 3311 3312 // Don't consider using declarations as previous declarations for 3313 // out-of-line members. 3314 RemoveUsingDecls(Previous); 3315 3316 // C++ 7.3.1.2p2: 3317 // Members (including explicit specializations of templates) of a named 3318 // namespace can also be defined outside that namespace by explicit 3319 // qualification of the name being defined, provided that the entity being 3320 // defined was already declared in the namespace and the definition appears 3321 // after the point of declaration in a namespace that encloses the 3322 // declarations namespace. 3323 // 3324 // Note that we only check the context at this point. We don't yet 3325 // have enough information to make sure that PrevDecl is actually 3326 // the declaration we want to match. For example, given: 3327 // 3328 // class X { 3329 // void f(); 3330 // void f(float); 3331 // }; 3332 // 3333 // void X::f(int) { } // ill-formed 3334 // 3335 // In this case, PrevDecl will point to the overload set 3336 // containing the two f's declared in X, but neither of them 3337 // matches. 3338 3339 // First check whether we named the global scope. 3340 if (isa<TranslationUnitDecl>(DC)) { 3341 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3342 << Name << D.getCXXScopeSpec().getRange(); 3343 } else { 3344 DeclContext *Cur = CurContext; 3345 while (isa<LinkageSpecDecl>(Cur)) 3346 Cur = Cur->getParent(); 3347 if (!Cur->Encloses(DC)) { 3348 // The qualifying scope doesn't enclose the original declaration. 3349 // Emit diagnostic based on current scope. 3350 SourceLocation L = D.getIdentifierLoc(); 3351 SourceRange R = D.getCXXScopeSpec().getRange(); 3352 if (isa<FunctionDecl>(Cur)) 3353 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3354 else 3355 Diag(L, diag::err_invalid_declarator_scope) 3356 << Name << cast<NamedDecl>(DC) << R; 3357 D.setInvalidType(); 3358 } 3359 } 3360 } 3361 3362 if (Previous.isSingleResult() && 3363 Previous.getFoundDecl()->isTemplateParameter()) { 3364 // Maybe we will complain about the shadowed template parameter. 3365 if (!D.isInvalidType()) 3366 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3367 Previous.getFoundDecl()); 3368 3369 // Just pretend that we didn't see the previous declaration. 3370 Previous.clear(); 3371 } 3372 3373 // In C++, the previous declaration we find might be a tag type 3374 // (class or enum). In this case, the new declaration will hide the 3375 // tag type. Note that this does does not apply if we're declaring a 3376 // typedef (C++ [dcl.typedef]p4). 3377 if (Previous.isSingleTagDecl() && 3378 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3379 Previous.clear(); 3380 3381 bool AddToScope = true; 3382 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3383 if (TemplateParamLists.size()) { 3384 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3385 return 0; 3386 } 3387 3388 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3389 } else if (R->isFunctionType()) { 3390 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3391 move(TemplateParamLists), 3392 AddToScope); 3393 } else { 3394 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3395 move(TemplateParamLists)); 3396 } 3397 3398 if (New == 0) 3399 return 0; 3400 3401 // If this has an identifier and is not an invalid redeclaration or 3402 // function template specialization, add it to the scope stack. 3403 if (New->getDeclName() && AddToScope && 3404 !(D.isRedeclaration() && New->isInvalidDecl())) 3405 PushOnScopeChains(New, S); 3406 3407 return New; 3408} 3409 3410/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3411/// types into constant array types in certain situations which would otherwise 3412/// be errors (for GCC compatibility). 3413static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3414 ASTContext &Context, 3415 bool &SizeIsNegative, 3416 llvm::APSInt &Oversized) { 3417 // This method tries to turn a variable array into a constant 3418 // array even when the size isn't an ICE. This is necessary 3419 // for compatibility with code that depends on gcc's buggy 3420 // constant expression folding, like struct {char x[(int)(char*)2];} 3421 SizeIsNegative = false; 3422 Oversized = 0; 3423 3424 if (T->isDependentType()) 3425 return QualType(); 3426 3427 QualifierCollector Qs; 3428 const Type *Ty = Qs.strip(T); 3429 3430 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3431 QualType Pointee = PTy->getPointeeType(); 3432 QualType FixedType = 3433 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3434 Oversized); 3435 if (FixedType.isNull()) return FixedType; 3436 FixedType = Context.getPointerType(FixedType); 3437 return Qs.apply(Context, FixedType); 3438 } 3439 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3440 QualType Inner = PTy->getInnerType(); 3441 QualType FixedType = 3442 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3443 Oversized); 3444 if (FixedType.isNull()) return FixedType; 3445 FixedType = Context.getParenType(FixedType); 3446 return Qs.apply(Context, FixedType); 3447 } 3448 3449 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3450 if (!VLATy) 3451 return QualType(); 3452 // FIXME: We should probably handle this case 3453 if (VLATy->getElementType()->isVariablyModifiedType()) 3454 return QualType(); 3455 3456 Expr::EvalResult EvalResult; 3457 if (!VLATy->getSizeExpr() || 3458 !VLATy->getSizeExpr()->EvaluateAsRValue(EvalResult, Context) || 3459 !EvalResult.Val.isInt()) 3460 return QualType(); 3461 3462 // Check whether the array size is negative. 3463 llvm::APSInt &Res = EvalResult.Val.getInt(); 3464 if (Res.isSigned() && Res.isNegative()) { 3465 SizeIsNegative = true; 3466 return QualType(); 3467 } 3468 3469 // Check whether the array is too large to be addressed. 3470 unsigned ActiveSizeBits 3471 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3472 Res); 3473 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3474 Oversized = Res; 3475 return QualType(); 3476 } 3477 3478 return Context.getConstantArrayType(VLATy->getElementType(), 3479 Res, ArrayType::Normal, 0); 3480} 3481 3482/// \brief Register the given locally-scoped external C declaration so 3483/// that it can be found later for redeclarations 3484void 3485Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3486 const LookupResult &Previous, 3487 Scope *S) { 3488 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3489 "Decl is not a locally-scoped decl!"); 3490 // Note that we have a locally-scoped external with this name. 3491 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3492 3493 if (!Previous.isSingleResult()) 3494 return; 3495 3496 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3497 3498 // If there was a previous declaration of this variable, it may be 3499 // in our identifier chain. Update the identifier chain with the new 3500 // declaration. 3501 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3502 // The previous declaration was found on the identifer resolver 3503 // chain, so remove it from its scope. 3504 3505 if (S->isDeclScope(PrevDecl)) { 3506 // Special case for redeclarations in the SAME scope. 3507 // Because this declaration is going to be added to the identifier chain 3508 // later, we should temporarily take it OFF the chain. 3509 IdResolver.RemoveDecl(ND); 3510 3511 } else { 3512 // Find the scope for the original declaration. 3513 while (S && !S->isDeclScope(PrevDecl)) 3514 S = S->getParent(); 3515 } 3516 3517 if (S) 3518 S->RemoveDecl(PrevDecl); 3519 } 3520} 3521 3522llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3523Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3524 if (ExternalSource) { 3525 // Load locally-scoped external decls from the external source. 3526 SmallVector<NamedDecl *, 4> Decls; 3527 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3528 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3529 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3530 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3531 if (Pos == LocallyScopedExternalDecls.end()) 3532 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3533 } 3534 } 3535 3536 return LocallyScopedExternalDecls.find(Name); 3537} 3538 3539/// \brief Diagnose function specifiers on a declaration of an identifier that 3540/// does not identify a function. 3541void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3542 // FIXME: We should probably indicate the identifier in question to avoid 3543 // confusion for constructs like "inline int a(), b;" 3544 if (D.getDeclSpec().isInlineSpecified()) 3545 Diag(D.getDeclSpec().getInlineSpecLoc(), 3546 diag::err_inline_non_function); 3547 3548 if (D.getDeclSpec().isVirtualSpecified()) 3549 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3550 diag::err_virtual_non_function); 3551 3552 if (D.getDeclSpec().isExplicitSpecified()) 3553 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3554 diag::err_explicit_non_function); 3555} 3556 3557NamedDecl* 3558Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3559 TypeSourceInfo *TInfo, LookupResult &Previous) { 3560 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3561 if (D.getCXXScopeSpec().isSet()) { 3562 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3563 << D.getCXXScopeSpec().getRange(); 3564 D.setInvalidType(); 3565 // Pretend we didn't see the scope specifier. 3566 DC = CurContext; 3567 Previous.clear(); 3568 } 3569 3570 if (getLangOptions().CPlusPlus) { 3571 // Check that there are no default arguments (C++ only). 3572 CheckExtraCXXDefaultArguments(D); 3573 } 3574 3575 DiagnoseFunctionSpecifiers(D); 3576 3577 if (D.getDeclSpec().isThreadSpecified()) 3578 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3579 if (D.getDeclSpec().isConstexprSpecified()) 3580 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3581 << 1; 3582 3583 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3584 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3585 << D.getName().getSourceRange(); 3586 return 0; 3587 } 3588 3589 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3590 if (!NewTD) return 0; 3591 3592 // Handle attributes prior to checking for duplicates in MergeVarDecl 3593 ProcessDeclAttributes(S, NewTD, D); 3594 3595 CheckTypedefForVariablyModifiedType(S, NewTD); 3596 3597 bool Redeclaration = D.isRedeclaration(); 3598 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3599 D.setRedeclaration(Redeclaration); 3600 return ND; 3601} 3602 3603void 3604Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3605 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3606 // then it shall have block scope. 3607 // Note that variably modified types must be fixed before merging the decl so 3608 // that redeclarations will match. 3609 QualType T = NewTD->getUnderlyingType(); 3610 if (T->isVariablyModifiedType()) { 3611 getCurFunction()->setHasBranchProtectedScope(); 3612 3613 if (S->getFnParent() == 0) { 3614 bool SizeIsNegative; 3615 llvm::APSInt Oversized; 3616 QualType FixedTy = 3617 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3618 Oversized); 3619 if (!FixedTy.isNull()) { 3620 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3621 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3622 } else { 3623 if (SizeIsNegative) 3624 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3625 else if (T->isVariableArrayType()) 3626 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3627 else if (Oversized.getBoolValue()) 3628 Diag(NewTD->getLocation(), diag::err_array_too_large) 3629 << Oversized.toString(10); 3630 else 3631 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3632 NewTD->setInvalidDecl(); 3633 } 3634 } 3635 } 3636} 3637 3638 3639/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3640/// declares a typedef-name, either using the 'typedef' type specifier or via 3641/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3642NamedDecl* 3643Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3644 LookupResult &Previous, bool &Redeclaration) { 3645 // Merge the decl with the existing one if appropriate. If the decl is 3646 // in an outer scope, it isn't the same thing. 3647 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3648 /*ExplicitInstantiationOrSpecialization=*/false); 3649 if (!Previous.empty()) { 3650 Redeclaration = true; 3651 MergeTypedefNameDecl(NewTD, Previous); 3652 } 3653 3654 // If this is the C FILE type, notify the AST context. 3655 if (IdentifierInfo *II = NewTD->getIdentifier()) 3656 if (!NewTD->isInvalidDecl() && 3657 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3658 if (II->isStr("FILE")) 3659 Context.setFILEDecl(NewTD); 3660 else if (II->isStr("jmp_buf")) 3661 Context.setjmp_bufDecl(NewTD); 3662 else if (II->isStr("sigjmp_buf")) 3663 Context.setsigjmp_bufDecl(NewTD); 3664 else if (II->isStr("__builtin_va_list")) 3665 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3666 } 3667 3668 return NewTD; 3669} 3670 3671/// \brief Determines whether the given declaration is an out-of-scope 3672/// previous declaration. 3673/// 3674/// This routine should be invoked when name lookup has found a 3675/// previous declaration (PrevDecl) that is not in the scope where a 3676/// new declaration by the same name is being introduced. If the new 3677/// declaration occurs in a local scope, previous declarations with 3678/// linkage may still be considered previous declarations (C99 3679/// 6.2.2p4-5, C++ [basic.link]p6). 3680/// 3681/// \param PrevDecl the previous declaration found by name 3682/// lookup 3683/// 3684/// \param DC the context in which the new declaration is being 3685/// declared. 3686/// 3687/// \returns true if PrevDecl is an out-of-scope previous declaration 3688/// for a new delcaration with the same name. 3689static bool 3690isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3691 ASTContext &Context) { 3692 if (!PrevDecl) 3693 return false; 3694 3695 if (!PrevDecl->hasLinkage()) 3696 return false; 3697 3698 if (Context.getLangOptions().CPlusPlus) { 3699 // C++ [basic.link]p6: 3700 // If there is a visible declaration of an entity with linkage 3701 // having the same name and type, ignoring entities declared 3702 // outside the innermost enclosing namespace scope, the block 3703 // scope declaration declares that same entity and receives the 3704 // linkage of the previous declaration. 3705 DeclContext *OuterContext = DC->getRedeclContext(); 3706 if (!OuterContext->isFunctionOrMethod()) 3707 // This rule only applies to block-scope declarations. 3708 return false; 3709 3710 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3711 if (PrevOuterContext->isRecord()) 3712 // We found a member function: ignore it. 3713 return false; 3714 3715 // Find the innermost enclosing namespace for the new and 3716 // previous declarations. 3717 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3718 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3719 3720 // The previous declaration is in a different namespace, so it 3721 // isn't the same function. 3722 if (!OuterContext->Equals(PrevOuterContext)) 3723 return false; 3724 } 3725 3726 return true; 3727} 3728 3729static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3730 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3731 if (!SS.isSet()) return; 3732 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3733} 3734 3735bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3736 QualType type = decl->getType(); 3737 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3738 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3739 // Various kinds of declaration aren't allowed to be __autoreleasing. 3740 unsigned kind = -1U; 3741 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3742 if (var->hasAttr<BlocksAttr>()) 3743 kind = 0; // __block 3744 else if (!var->hasLocalStorage()) 3745 kind = 1; // global 3746 } else if (isa<ObjCIvarDecl>(decl)) { 3747 kind = 3; // ivar 3748 } else if (isa<FieldDecl>(decl)) { 3749 kind = 2; // field 3750 } 3751 3752 if (kind != -1U) { 3753 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3754 << kind; 3755 } 3756 } else if (lifetime == Qualifiers::OCL_None) { 3757 // Try to infer lifetime. 3758 if (!type->isObjCLifetimeType()) 3759 return false; 3760 3761 lifetime = type->getObjCARCImplicitLifetime(); 3762 type = Context.getLifetimeQualifiedType(type, lifetime); 3763 decl->setType(type); 3764 } 3765 3766 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3767 // Thread-local variables cannot have lifetime. 3768 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3769 var->isThreadSpecified()) { 3770 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3771 << var->getType(); 3772 return true; 3773 } 3774 } 3775 3776 return false; 3777} 3778 3779NamedDecl* 3780Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3781 TypeSourceInfo *TInfo, LookupResult &Previous, 3782 MultiTemplateParamsArg TemplateParamLists) { 3783 QualType R = TInfo->getType(); 3784 DeclarationName Name = GetNameForDeclarator(D).getName(); 3785 3786 // Check that there are no default arguments (C++ only). 3787 if (getLangOptions().CPlusPlus) 3788 CheckExtraCXXDefaultArguments(D); 3789 3790 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3791 assert(SCSpec != DeclSpec::SCS_typedef && 3792 "Parser allowed 'typedef' as storage class VarDecl."); 3793 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3794 if (SCSpec == DeclSpec::SCS_mutable) { 3795 // mutable can only appear on non-static class members, so it's always 3796 // an error here 3797 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3798 D.setInvalidType(); 3799 SC = SC_None; 3800 } 3801 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3802 VarDecl::StorageClass SCAsWritten 3803 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3804 3805 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3806 if (!II) { 3807 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3808 << Name; 3809 return 0; 3810 } 3811 3812 DiagnoseFunctionSpecifiers(D); 3813 3814 if (!DC->isRecord() && S->getFnParent() == 0) { 3815 // C99 6.9p2: The storage-class specifiers auto and register shall not 3816 // appear in the declaration specifiers in an external declaration. 3817 if (SC == SC_Auto || SC == SC_Register) { 3818 3819 // If this is a register variable with an asm label specified, then this 3820 // is a GNU extension. 3821 if (SC == SC_Register && D.getAsmLabel()) 3822 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3823 else 3824 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3825 D.setInvalidType(); 3826 } 3827 } 3828 3829 if (getLangOptions().OpenCL) { 3830 // Set up the special work-group-local storage class for variables in the 3831 // OpenCL __local address space. 3832 if (R.getAddressSpace() == LangAS::opencl_local) 3833 SC = SC_OpenCLWorkGroupLocal; 3834 } 3835 3836 bool isExplicitSpecialization = false; 3837 VarDecl *NewVD; 3838 if (!getLangOptions().CPlusPlus) { 3839 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3840 D.getIdentifierLoc(), II, 3841 R, TInfo, SC, SCAsWritten); 3842 3843 if (D.isInvalidType()) 3844 NewVD->setInvalidDecl(); 3845 } else { 3846 if (DC->isRecord() && !CurContext->isRecord()) { 3847 // This is an out-of-line definition of a static data member. 3848 if (SC == SC_Static) { 3849 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3850 diag::err_static_out_of_line) 3851 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3852 } else if (SC == SC_None) 3853 SC = SC_Static; 3854 } 3855 if (SC == SC_Static) { 3856 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3857 if (RD->isLocalClass()) 3858 Diag(D.getIdentifierLoc(), 3859 diag::err_static_data_member_not_allowed_in_local_class) 3860 << Name << RD->getDeclName(); 3861 3862 // C++ [class.union]p1: If a union contains a static data member, 3863 // the program is ill-formed. 3864 // 3865 // We also disallow static data members in anonymous structs. 3866 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3867 Diag(D.getIdentifierLoc(), 3868 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3869 << Name << RD->isUnion(); 3870 } 3871 } 3872 3873 // Match up the template parameter lists with the scope specifier, then 3874 // determine whether we have a template or a template specialization. 3875 isExplicitSpecialization = false; 3876 bool Invalid = false; 3877 if (TemplateParameterList *TemplateParams 3878 = MatchTemplateParametersToScopeSpecifier( 3879 D.getDeclSpec().getSourceRange().getBegin(), 3880 D.getIdentifierLoc(), 3881 D.getCXXScopeSpec(), 3882 TemplateParamLists.get(), 3883 TemplateParamLists.size(), 3884 /*never a friend*/ false, 3885 isExplicitSpecialization, 3886 Invalid)) { 3887 if (TemplateParams->size() > 0) { 3888 // There is no such thing as a variable template. 3889 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3890 << II 3891 << SourceRange(TemplateParams->getTemplateLoc(), 3892 TemplateParams->getRAngleLoc()); 3893 return 0; 3894 } else { 3895 // There is an extraneous 'template<>' for this variable. Complain 3896 // about it, but allow the declaration of the variable. 3897 Diag(TemplateParams->getTemplateLoc(), 3898 diag::err_template_variable_noparams) 3899 << II 3900 << SourceRange(TemplateParams->getTemplateLoc(), 3901 TemplateParams->getRAngleLoc()); 3902 } 3903 } 3904 3905 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3906 D.getIdentifierLoc(), II, 3907 R, TInfo, SC, SCAsWritten); 3908 3909 // If this decl has an auto type in need of deduction, make a note of the 3910 // Decl so we can diagnose uses of it in its own initializer. 3911 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3912 R->getContainedAutoType()) 3913 ParsingInitForAutoVars.insert(NewVD); 3914 3915 if (D.isInvalidType() || Invalid) 3916 NewVD->setInvalidDecl(); 3917 3918 SetNestedNameSpecifier(NewVD, D); 3919 3920 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3921 NewVD->setTemplateParameterListsInfo(Context, 3922 TemplateParamLists.size(), 3923 TemplateParamLists.release()); 3924 } 3925 3926 if (D.getDeclSpec().isConstexprSpecified()) { 3927 // FIXME: once we know whether there's an initializer, apply this to 3928 // static data members too. 3929 if (!NewVD->isStaticDataMember() && 3930 !NewVD->isThisDeclarationADefinition()) { 3931 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3932 // of a variable. Suggest replacing it with 'const' if appropriate. 3933 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3934 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3935 // If the declarator is complex, we need to move the keyword to the 3936 // innermost chunk as we switch it from 'constexpr' to 'const'. 3937 int Kind = DeclaratorChunk::Paren; 3938 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3939 Kind = D.getTypeObject(I).Kind; 3940 if (Kind != DeclaratorChunk::Paren) 3941 break; 3942 } 3943 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3944 Kind == DeclaratorChunk::Reference) 3945 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3946 << FixItHint::CreateRemoval(ConstexprRange); 3947 else if (Kind == DeclaratorChunk::Paren) 3948 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3949 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3950 else 3951 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3952 << FixItHint::CreateRemoval(ConstexprRange) 3953 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3954 } else { 3955 NewVD->setConstexpr(true); 3956 } 3957 } 3958 } 3959 3960 // Set the lexical context. If the declarator has a C++ scope specifier, the 3961 // lexical context will be different from the semantic context. 3962 NewVD->setLexicalDeclContext(CurContext); 3963 3964 if (D.getDeclSpec().isThreadSpecified()) { 3965 if (NewVD->hasLocalStorage()) 3966 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3967 else if (!Context.getTargetInfo().isTLSSupported()) 3968 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3969 else 3970 NewVD->setThreadSpecified(true); 3971 } 3972 3973 if (D.getDeclSpec().isModulePrivateSpecified()) { 3974 if (isExplicitSpecialization) 3975 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3976 << 2 3977 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3978 else if (NewVD->hasLocalStorage()) 3979 Diag(NewVD->getLocation(), diag::err_module_private_local) 3980 << 0 << NewVD->getDeclName() 3981 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3982 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3983 else 3984 NewVD->setModulePrivate(); 3985 } 3986 3987 // Handle attributes prior to checking for duplicates in MergeVarDecl 3988 ProcessDeclAttributes(S, NewVD, D); 3989 3990 // In auto-retain/release, infer strong retension for variables of 3991 // retainable type. 3992 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3993 NewVD->setInvalidDecl(); 3994 3995 // Handle GNU asm-label extension (encoded as an attribute). 3996 if (Expr *E = (Expr*)D.getAsmLabel()) { 3997 // The parser guarantees this is a string. 3998 StringLiteral *SE = cast<StringLiteral>(E); 3999 StringRef Label = SE->getString(); 4000 if (S->getFnParent() != 0) { 4001 switch (SC) { 4002 case SC_None: 4003 case SC_Auto: 4004 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4005 break; 4006 case SC_Register: 4007 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4008 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4009 break; 4010 case SC_Static: 4011 case SC_Extern: 4012 case SC_PrivateExtern: 4013 case SC_OpenCLWorkGroupLocal: 4014 break; 4015 } 4016 } 4017 4018 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4019 Context, Label)); 4020 } 4021 4022 // Diagnose shadowed variables before filtering for scope. 4023 if (!D.getCXXScopeSpec().isSet()) 4024 CheckShadow(S, NewVD, Previous); 4025 4026 // Don't consider existing declarations that are in a different 4027 // scope and are out-of-semantic-context declarations (if the new 4028 // declaration has linkage). 4029 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4030 isExplicitSpecialization); 4031 4032 if (!getLangOptions().CPlusPlus) { 4033 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4034 } else { 4035 // Merge the decl with the existing one if appropriate. 4036 if (!Previous.empty()) { 4037 if (Previous.isSingleResult() && 4038 isa<FieldDecl>(Previous.getFoundDecl()) && 4039 D.getCXXScopeSpec().isSet()) { 4040 // The user tried to define a non-static data member 4041 // out-of-line (C++ [dcl.meaning]p1). 4042 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4043 << D.getCXXScopeSpec().getRange(); 4044 Previous.clear(); 4045 NewVD->setInvalidDecl(); 4046 } 4047 } else if (D.getCXXScopeSpec().isSet()) { 4048 // No previous declaration in the qualifying scope. 4049 Diag(D.getIdentifierLoc(), diag::err_no_member) 4050 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4051 << D.getCXXScopeSpec().getRange(); 4052 NewVD->setInvalidDecl(); 4053 } 4054 4055 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4056 4057 // This is an explicit specialization of a static data member. Check it. 4058 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4059 CheckMemberSpecialization(NewVD, Previous)) 4060 NewVD->setInvalidDecl(); 4061 } 4062 4063 // attributes declared post-definition are currently ignored 4064 // FIXME: This should be handled in attribute merging, not 4065 // here. 4066 if (Previous.isSingleResult()) { 4067 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4068 if (Def && (Def = Def->getDefinition()) && 4069 Def != NewVD && D.hasAttributes()) { 4070 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4071 Diag(Def->getLocation(), diag::note_previous_definition); 4072 } 4073 } 4074 4075 // If this is a locally-scoped extern C variable, update the map of 4076 // such variables. 4077 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4078 !NewVD->isInvalidDecl()) 4079 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4080 4081 // If there's a #pragma GCC visibility in scope, and this isn't a class 4082 // member, set the visibility of this variable. 4083 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4084 AddPushedVisibilityAttribute(NewVD); 4085 4086 MarkUnusedFileScopedDecl(NewVD); 4087 4088 return NewVD; 4089} 4090 4091/// \brief Diagnose variable or built-in function shadowing. Implements 4092/// -Wshadow. 4093/// 4094/// This method is called whenever a VarDecl is added to a "useful" 4095/// scope. 4096/// 4097/// \param S the scope in which the shadowing name is being declared 4098/// \param R the lookup of the name 4099/// 4100void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4101 // Return if warning is ignored. 4102 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4103 DiagnosticsEngine::Ignored) 4104 return; 4105 4106 // Don't diagnose declarations at file scope. 4107 if (D->hasGlobalStorage()) 4108 return; 4109 4110 DeclContext *NewDC = D->getDeclContext(); 4111 4112 // Only diagnose if we're shadowing an unambiguous field or variable. 4113 if (R.getResultKind() != LookupResult::Found) 4114 return; 4115 4116 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4117 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4118 return; 4119 4120 // Fields are not shadowed by variables in C++ static methods. 4121 if (isa<FieldDecl>(ShadowedDecl)) 4122 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4123 if (MD->isStatic()) 4124 return; 4125 4126 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4127 if (shadowedVar->isExternC()) { 4128 // For shadowing external vars, make sure that we point to the global 4129 // declaration, not a locally scoped extern declaration. 4130 for (VarDecl::redecl_iterator 4131 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4132 I != E; ++I) 4133 if (I->isFileVarDecl()) { 4134 ShadowedDecl = *I; 4135 break; 4136 } 4137 } 4138 4139 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4140 4141 // Only warn about certain kinds of shadowing for class members. 4142 if (NewDC && NewDC->isRecord()) { 4143 // In particular, don't warn about shadowing non-class members. 4144 if (!OldDC->isRecord()) 4145 return; 4146 4147 // TODO: should we warn about static data members shadowing 4148 // static data members from base classes? 4149 4150 // TODO: don't diagnose for inaccessible shadowed members. 4151 // This is hard to do perfectly because we might friend the 4152 // shadowing context, but that's just a false negative. 4153 } 4154 4155 // Determine what kind of declaration we're shadowing. 4156 unsigned Kind; 4157 if (isa<RecordDecl>(OldDC)) { 4158 if (isa<FieldDecl>(ShadowedDecl)) 4159 Kind = 3; // field 4160 else 4161 Kind = 2; // static data member 4162 } else if (OldDC->isFileContext()) 4163 Kind = 1; // global 4164 else 4165 Kind = 0; // local 4166 4167 DeclarationName Name = R.getLookupName(); 4168 4169 // Emit warning and note. 4170 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4171 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4172} 4173 4174/// \brief Check -Wshadow without the advantage of a previous lookup. 4175void Sema::CheckShadow(Scope *S, VarDecl *D) { 4176 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4177 DiagnosticsEngine::Ignored) 4178 return; 4179 4180 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4181 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4182 LookupName(R, S); 4183 CheckShadow(S, D, R); 4184} 4185 4186/// \brief Perform semantic checking on a newly-created variable 4187/// declaration. 4188/// 4189/// This routine performs all of the type-checking required for a 4190/// variable declaration once it has been built. It is used both to 4191/// check variables after they have been parsed and their declarators 4192/// have been translated into a declaration, and to check variables 4193/// that have been instantiated from a template. 4194/// 4195/// Sets NewVD->isInvalidDecl() if an error was encountered. 4196/// 4197/// Returns true if the variable declaration is a redeclaration. 4198bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4199 LookupResult &Previous) { 4200 // If the decl is already known invalid, don't check it. 4201 if (NewVD->isInvalidDecl()) 4202 return false; 4203 4204 QualType T = NewVD->getType(); 4205 4206 if (T->isObjCObjectType()) { 4207 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4208 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4209 T = Context.getObjCObjectPointerType(T); 4210 NewVD->setType(T); 4211 } 4212 4213 // Emit an error if an address space was applied to decl with local storage. 4214 // This includes arrays of objects with address space qualifiers, but not 4215 // automatic variables that point to other address spaces. 4216 // ISO/IEC TR 18037 S5.1.2 4217 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4218 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4219 NewVD->setInvalidDecl(); 4220 return false; 4221 } 4222 4223 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4224 && !NewVD->hasAttr<BlocksAttr>()) { 4225 if (getLangOptions().getGC() != LangOptions::NonGC) 4226 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4227 else 4228 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4229 } 4230 4231 bool isVM = T->isVariablyModifiedType(); 4232 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4233 NewVD->hasAttr<BlocksAttr>()) 4234 getCurFunction()->setHasBranchProtectedScope(); 4235 4236 if ((isVM && NewVD->hasLinkage()) || 4237 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4238 bool SizeIsNegative; 4239 llvm::APSInt Oversized; 4240 QualType FixedTy = 4241 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4242 Oversized); 4243 4244 if (FixedTy.isNull() && T->isVariableArrayType()) { 4245 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4246 // FIXME: This won't give the correct result for 4247 // int a[10][n]; 4248 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4249 4250 if (NewVD->isFileVarDecl()) 4251 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4252 << SizeRange; 4253 else if (NewVD->getStorageClass() == SC_Static) 4254 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4255 << SizeRange; 4256 else 4257 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4258 << SizeRange; 4259 NewVD->setInvalidDecl(); 4260 return false; 4261 } 4262 4263 if (FixedTy.isNull()) { 4264 if (NewVD->isFileVarDecl()) 4265 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4266 else 4267 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4268 NewVD->setInvalidDecl(); 4269 return false; 4270 } 4271 4272 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4273 NewVD->setType(FixedTy); 4274 } 4275 4276 if (Previous.empty() && NewVD->isExternC()) { 4277 // Since we did not find anything by this name and we're declaring 4278 // an extern "C" variable, look for a non-visible extern "C" 4279 // declaration with the same name. 4280 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4281 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4282 if (Pos != LocallyScopedExternalDecls.end()) 4283 Previous.addDecl(Pos->second); 4284 } 4285 4286 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4287 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4288 << T; 4289 NewVD->setInvalidDecl(); 4290 return false; 4291 } 4292 4293 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4294 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4295 NewVD->setInvalidDecl(); 4296 return false; 4297 } 4298 4299 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4300 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4301 NewVD->setInvalidDecl(); 4302 return false; 4303 } 4304 4305 // Function pointers and references cannot have qualified function type, only 4306 // function pointer-to-members can do that. 4307 QualType Pointee; 4308 unsigned PtrOrRef = 0; 4309 if (const PointerType *Ptr = T->getAs<PointerType>()) 4310 Pointee = Ptr->getPointeeType(); 4311 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4312 Pointee = Ref->getPointeeType(); 4313 PtrOrRef = 1; 4314 } 4315 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4316 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4317 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4318 << PtrOrRef; 4319 NewVD->setInvalidDecl(); 4320 return false; 4321 } 4322 4323 if (!Previous.empty()) { 4324 MergeVarDecl(NewVD, Previous); 4325 return true; 4326 } 4327 return false; 4328} 4329 4330/// \brief Data used with FindOverriddenMethod 4331struct FindOverriddenMethodData { 4332 Sema *S; 4333 CXXMethodDecl *Method; 4334}; 4335 4336/// \brief Member lookup function that determines whether a given C++ 4337/// method overrides a method in a base class, to be used with 4338/// CXXRecordDecl::lookupInBases(). 4339static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4340 CXXBasePath &Path, 4341 void *UserData) { 4342 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4343 4344 FindOverriddenMethodData *Data 4345 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4346 4347 DeclarationName Name = Data->Method->getDeclName(); 4348 4349 // FIXME: Do we care about other names here too? 4350 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4351 // We really want to find the base class destructor here. 4352 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4353 CanQualType CT = Data->S->Context.getCanonicalType(T); 4354 4355 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4356 } 4357 4358 for (Path.Decls = BaseRecord->lookup(Name); 4359 Path.Decls.first != Path.Decls.second; 4360 ++Path.Decls.first) { 4361 NamedDecl *D = *Path.Decls.first; 4362 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4363 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4364 return true; 4365 } 4366 } 4367 4368 return false; 4369} 4370 4371/// AddOverriddenMethods - See if a method overrides any in the base classes, 4372/// and if so, check that it's a valid override and remember it. 4373bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4374 // Look for virtual methods in base classes that this method might override. 4375 CXXBasePaths Paths; 4376 FindOverriddenMethodData Data; 4377 Data.Method = MD; 4378 Data.S = this; 4379 bool AddedAny = false; 4380 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4381 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4382 E = Paths.found_decls_end(); I != E; ++I) { 4383 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4384 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4385 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4386 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4387 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4388 AddedAny = true; 4389 } 4390 } 4391 } 4392 } 4393 4394 return AddedAny; 4395} 4396 4397namespace { 4398 // Struct for holding all of the extra arguments needed by 4399 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4400 struct ActOnFDArgs { 4401 Scope *S; 4402 Declarator &D; 4403 MultiTemplateParamsArg TemplateParamLists; 4404 bool AddToScope; 4405 }; 4406} 4407 4408/// \brief Generate diagnostics for an invalid function redeclaration. 4409/// 4410/// This routine handles generating the diagnostic messages for an invalid 4411/// function redeclaration, including finding possible similar declarations 4412/// or performing typo correction if there are no previous declarations with 4413/// the same name. 4414/// 4415/// Returns a NamedDecl iff typo correction was performed and substituting in 4416/// the new declaration name does not cause new errors. 4417static NamedDecl* DiagnoseInvalidRedeclaration( 4418 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4419 ActOnFDArgs &ExtraArgs) { 4420 NamedDecl *Result = NULL; 4421 DeclarationName Name = NewFD->getDeclName(); 4422 DeclContext *NewDC = NewFD->getDeclContext(); 4423 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4424 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4425 llvm::SmallVector<unsigned, 1> MismatchedParams; 4426 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4427 TypoCorrection Correction; 4428 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4429 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4430 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4431 : diag::err_member_def_does_not_match; 4432 4433 NewFD->setInvalidDecl(); 4434 SemaRef.LookupQualifiedName(Prev, NewDC); 4435 assert(!Prev.isAmbiguous() && 4436 "Cannot have an ambiguity in previous-declaration lookup"); 4437 if (!Prev.empty()) { 4438 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4439 Func != FuncEnd; ++Func) { 4440 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4441 if (FD && 4442 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4443 // Add 1 to the index so that 0 can mean the mismatch didn't 4444 // involve a parameter 4445 unsigned ParamNum = 4446 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4447 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4448 } 4449 } 4450 // If the qualified name lookup yielded nothing, try typo correction 4451 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4452 Prev.getLookupKind(), 0, 0, NewDC)) && 4453 Correction.getCorrection() != Name) { 4454 // Trap errors. 4455 Sema::SFINAETrap Trap(SemaRef); 4456 4457 // Set up everything for the call to ActOnFunctionDeclarator 4458 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4459 ExtraArgs.D.getIdentifierLoc()); 4460 Previous.clear(); 4461 Previous.setLookupName(Correction.getCorrection()); 4462 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4463 CDeclEnd = Correction.end(); 4464 CDecl != CDeclEnd; ++CDecl) { 4465 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4466 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4467 MismatchedParams)) { 4468 Previous.addDecl(FD); 4469 } 4470 } 4471 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4472 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4473 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4474 // eliminate the need for the parameter pack ExtraArgs. 4475 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4476 NewFD->getDeclContext(), 4477 NewFD->getTypeSourceInfo(), 4478 Previous, 4479 ExtraArgs.TemplateParamLists, 4480 ExtraArgs.AddToScope); 4481 if (Trap.hasErrorOccurred()) { 4482 // Pretend the typo correction never occurred 4483 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4484 ExtraArgs.D.getIdentifierLoc()); 4485 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4486 Previous.clear(); 4487 Previous.setLookupName(Name); 4488 Result = NULL; 4489 } else { 4490 for (LookupResult::iterator Func = Previous.begin(), 4491 FuncEnd = Previous.end(); 4492 Func != FuncEnd; ++Func) { 4493 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4494 NearMatches.push_back(std::make_pair(FD, 0)); 4495 } 4496 } 4497 if (NearMatches.empty()) { 4498 // Ignore the correction if it didn't yield any close FunctionDecl matches 4499 Correction = TypoCorrection(); 4500 } else { 4501 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4502 : diag::err_member_def_does_not_match_suggest; 4503 } 4504 } 4505 4506 if (Correction) 4507 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4508 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4509 << FixItHint::CreateReplacement( 4510 NewFD->getLocation(), 4511 Correction.getAsString(SemaRef.getLangOptions())); 4512 else 4513 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4514 << Name << NewDC << NewFD->getLocation(); 4515 4516 bool NewFDisConst = false; 4517 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4518 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4519 4520 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4521 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4522 NearMatch != NearMatchEnd; ++NearMatch) { 4523 FunctionDecl *FD = NearMatch->first; 4524 bool FDisConst = false; 4525 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4526 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4527 4528 if (unsigned Idx = NearMatch->second) { 4529 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4530 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4531 diag::note_member_def_close_param_match) 4532 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4533 } else if (Correction) { 4534 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4535 << Correction.getQuoted(SemaRef.getLangOptions()); 4536 } else if (FDisConst != NewFDisConst) { 4537 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4538 << NewFDisConst << FD->getSourceRange().getEnd(); 4539 } else 4540 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4541 } 4542 return Result; 4543} 4544 4545static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4546 Declarator &D) { 4547 switch (D.getDeclSpec().getStorageClassSpec()) { 4548 default: llvm_unreachable("Unknown storage class!"); 4549 case DeclSpec::SCS_auto: 4550 case DeclSpec::SCS_register: 4551 case DeclSpec::SCS_mutable: 4552 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4553 diag::err_typecheck_sclass_func); 4554 D.setInvalidType(); 4555 break; 4556 case DeclSpec::SCS_unspecified: break; 4557 case DeclSpec::SCS_extern: return SC_Extern; 4558 case DeclSpec::SCS_static: { 4559 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4560 // C99 6.7.1p5: 4561 // The declaration of an identifier for a function that has 4562 // block scope shall have no explicit storage-class specifier 4563 // other than extern 4564 // See also (C++ [dcl.stc]p4). 4565 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4566 diag::err_static_block_func); 4567 break; 4568 } else 4569 return SC_Static; 4570 } 4571 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4572 } 4573 4574 // No explicit storage class has already been returned 4575 return SC_None; 4576} 4577 4578static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4579 DeclContext *DC, QualType &R, 4580 TypeSourceInfo *TInfo, 4581 FunctionDecl::StorageClass SC, 4582 bool &IsVirtualOkay) { 4583 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4584 DeclarationName Name = NameInfo.getName(); 4585 4586 FunctionDecl *NewFD = 0; 4587 bool isInline = D.getDeclSpec().isInlineSpecified(); 4588 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4589 FunctionDecl::StorageClass SCAsWritten 4590 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4591 4592 if (!SemaRef.getLangOptions().CPlusPlus) { 4593 // Determine whether the function was written with a 4594 // prototype. This true when: 4595 // - there is a prototype in the declarator, or 4596 // - the type R of the function is some kind of typedef or other reference 4597 // to a type name (which eventually refers to a function type). 4598 bool HasPrototype = 4599 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4600 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4601 4602 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4603 D.getSourceRange().getBegin(), NameInfo, R, 4604 TInfo, SC, SCAsWritten, isInline, 4605 HasPrototype); 4606 if (D.isInvalidType()) 4607 NewFD->setInvalidDecl(); 4608 4609 // Set the lexical context. 4610 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4611 4612 return NewFD; 4613 } 4614 4615 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4616 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4617 4618 // Check that the return type is not an abstract class type. 4619 // For record types, this is done by the AbstractClassUsageDiagnoser once 4620 // the class has been completely parsed. 4621 if (!DC->isRecord() && 4622 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4623 R->getAs<FunctionType>()->getResultType(), 4624 diag::err_abstract_type_in_decl, 4625 SemaRef.AbstractReturnType)) 4626 D.setInvalidType(); 4627 4628 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4629 // This is a C++ constructor declaration. 4630 assert(DC->isRecord() && 4631 "Constructors can only be declared in a member context"); 4632 4633 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4634 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4635 D.getSourceRange().getBegin(), NameInfo, 4636 R, TInfo, isExplicit, isInline, 4637 /*isImplicitlyDeclared=*/false, 4638 isConstexpr); 4639 4640 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4641 // This is a C++ destructor declaration. 4642 if (DC->isRecord()) { 4643 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4644 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4645 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4646 SemaRef.Context, Record, 4647 D.getSourceRange().getBegin(), 4648 NameInfo, R, TInfo, isInline, 4649 /*isImplicitlyDeclared=*/false); 4650 4651 // If the class is complete, then we now create the implicit exception 4652 // specification. If the class is incomplete or dependent, we can't do 4653 // it yet. 4654 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4655 Record->getDefinition() && !Record->isBeingDefined() && 4656 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4657 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4658 } 4659 4660 IsVirtualOkay = true; 4661 return NewDD; 4662 4663 } else { 4664 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4665 D.setInvalidType(); 4666 4667 // Create a FunctionDecl to satisfy the function definition parsing 4668 // code path. 4669 return FunctionDecl::Create(SemaRef.Context, DC, 4670 D.getSourceRange().getBegin(), 4671 D.getIdentifierLoc(), Name, R, TInfo, 4672 SC, SCAsWritten, isInline, 4673 /*hasPrototype=*/true, isConstexpr); 4674 } 4675 4676 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4677 if (!DC->isRecord()) { 4678 SemaRef.Diag(D.getIdentifierLoc(), 4679 diag::err_conv_function_not_member); 4680 return 0; 4681 } 4682 4683 SemaRef.CheckConversionDeclarator(D, R, SC); 4684 IsVirtualOkay = true; 4685 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4686 D.getSourceRange().getBegin(), NameInfo, 4687 R, TInfo, isInline, isExplicit, 4688 isConstexpr, SourceLocation()); 4689 4690 } else if (DC->isRecord()) { 4691 // If the name of the function is the same as the name of the record, 4692 // then this must be an invalid constructor that has a return type. 4693 // (The parser checks for a return type and makes the declarator a 4694 // constructor if it has no return type). 4695 if (Name.getAsIdentifierInfo() && 4696 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4697 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4698 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4699 << SourceRange(D.getIdentifierLoc()); 4700 return 0; 4701 } 4702 4703 bool isStatic = SC == SC_Static; 4704 4705 // [class.free]p1: 4706 // Any allocation function for a class T is a static member 4707 // (even if not explicitly declared static). 4708 if (Name.getCXXOverloadedOperator() == OO_New || 4709 Name.getCXXOverloadedOperator() == OO_Array_New) 4710 isStatic = true; 4711 4712 // [class.free]p6 Any deallocation function for a class X is a static member 4713 // (even if not explicitly declared static). 4714 if (Name.getCXXOverloadedOperator() == OO_Delete || 4715 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4716 isStatic = true; 4717 4718 IsVirtualOkay = !isStatic; 4719 4720 // This is a C++ method declaration. 4721 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4722 D.getSourceRange().getBegin(), NameInfo, R, 4723 TInfo, isStatic, SCAsWritten, isInline, 4724 isConstexpr, SourceLocation()); 4725 4726 } else { 4727 // Determine whether the function was written with a 4728 // prototype. This true when: 4729 // - we're in C++ (where every function has a prototype), 4730 return FunctionDecl::Create(SemaRef.Context, DC, 4731 D.getSourceRange().getBegin(), 4732 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4733 true/*HasPrototype*/, isConstexpr); 4734 } 4735} 4736 4737NamedDecl* 4738Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4739 TypeSourceInfo *TInfo, LookupResult &Previous, 4740 MultiTemplateParamsArg TemplateParamLists, 4741 bool &AddToScope) { 4742 QualType R = TInfo->getType(); 4743 4744 assert(R.getTypePtr()->isFunctionType()); 4745 4746 // TODO: consider using NameInfo for diagnostic. 4747 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4748 DeclarationName Name = NameInfo.getName(); 4749 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4750 4751 if (D.getDeclSpec().isThreadSpecified()) 4752 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4753 4754 // Do not allow returning a objc interface by-value. 4755 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4756 Diag(D.getIdentifierLoc(), 4757 diag::err_object_cannot_be_passed_returned_by_value) << 0 4758 << R->getAs<FunctionType>()->getResultType() 4759 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4760 4761 QualType T = R->getAs<FunctionType>()->getResultType(); 4762 T = Context.getObjCObjectPointerType(T); 4763 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4764 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4765 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4766 FPT->getNumArgs(), EPI); 4767 } 4768 else if (isa<FunctionNoProtoType>(R)) 4769 R = Context.getFunctionNoProtoType(T); 4770 } 4771 4772 bool isFriend = false; 4773 FunctionTemplateDecl *FunctionTemplate = 0; 4774 bool isExplicitSpecialization = false; 4775 bool isFunctionTemplateSpecialization = false; 4776 bool isDependentClassScopeExplicitSpecialization = false; 4777 bool isVirtualOkay = false; 4778 4779 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4780 isVirtualOkay); 4781 if (!NewFD) return 0; 4782 4783 if (getLangOptions().CPlusPlus) { 4784 bool isInline = D.getDeclSpec().isInlineSpecified(); 4785 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4786 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4787 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4788 isFriend = D.getDeclSpec().isFriendSpecified(); 4789 if (isFriend && !isInline && D.isFunctionDefinition()) { 4790 // C++ [class.friend]p5 4791 // A function can be defined in a friend declaration of a 4792 // class . . . . Such a function is implicitly inline. 4793 NewFD->setImplicitlyInline(); 4794 } 4795 4796 SetNestedNameSpecifier(NewFD, D); 4797 isExplicitSpecialization = false; 4798 isFunctionTemplateSpecialization = false; 4799 if (D.isInvalidType()) 4800 NewFD->setInvalidDecl(); 4801 4802 // Set the lexical context. If the declarator has a C++ 4803 // scope specifier, or is the object of a friend declaration, the 4804 // lexical context will be different from the semantic context. 4805 NewFD->setLexicalDeclContext(CurContext); 4806 4807 // Match up the template parameter lists with the scope specifier, then 4808 // determine whether we have a template or a template specialization. 4809 bool Invalid = false; 4810 if (TemplateParameterList *TemplateParams 4811 = MatchTemplateParametersToScopeSpecifier( 4812 D.getDeclSpec().getSourceRange().getBegin(), 4813 D.getIdentifierLoc(), 4814 D.getCXXScopeSpec(), 4815 TemplateParamLists.get(), 4816 TemplateParamLists.size(), 4817 isFriend, 4818 isExplicitSpecialization, 4819 Invalid)) { 4820 if (TemplateParams->size() > 0) { 4821 // This is a function template 4822 4823 // Check that we can declare a template here. 4824 if (CheckTemplateDeclScope(S, TemplateParams)) 4825 return 0; 4826 4827 // A destructor cannot be a template. 4828 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4829 Diag(NewFD->getLocation(), diag::err_destructor_template); 4830 return 0; 4831 } 4832 4833 // If we're adding a template to a dependent context, we may need to 4834 // rebuilding some of the types used within the template parameter list, 4835 // now that we know what the current instantiation is. 4836 if (DC->isDependentContext()) { 4837 ContextRAII SavedContext(*this, DC); 4838 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4839 Invalid = true; 4840 } 4841 4842 4843 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4844 NewFD->getLocation(), 4845 Name, TemplateParams, 4846 NewFD); 4847 FunctionTemplate->setLexicalDeclContext(CurContext); 4848 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4849 4850 // For source fidelity, store the other template param lists. 4851 if (TemplateParamLists.size() > 1) { 4852 NewFD->setTemplateParameterListsInfo(Context, 4853 TemplateParamLists.size() - 1, 4854 TemplateParamLists.release()); 4855 } 4856 } else { 4857 // This is a function template specialization. 4858 isFunctionTemplateSpecialization = true; 4859 // For source fidelity, store all the template param lists. 4860 NewFD->setTemplateParameterListsInfo(Context, 4861 TemplateParamLists.size(), 4862 TemplateParamLists.release()); 4863 4864 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4865 if (isFriend) { 4866 // We want to remove the "template<>", found here. 4867 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4868 4869 // If we remove the template<> and the name is not a 4870 // template-id, we're actually silently creating a problem: 4871 // the friend declaration will refer to an untemplated decl, 4872 // and clearly the user wants a template specialization. So 4873 // we need to insert '<>' after the name. 4874 SourceLocation InsertLoc; 4875 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4876 InsertLoc = D.getName().getSourceRange().getEnd(); 4877 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4878 } 4879 4880 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4881 << Name << RemoveRange 4882 << FixItHint::CreateRemoval(RemoveRange) 4883 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4884 } 4885 } 4886 } 4887 else { 4888 // All template param lists were matched against the scope specifier: 4889 // this is NOT (an explicit specialization of) a template. 4890 if (TemplateParamLists.size() > 0) 4891 // For source fidelity, store all the template param lists. 4892 NewFD->setTemplateParameterListsInfo(Context, 4893 TemplateParamLists.size(), 4894 TemplateParamLists.release()); 4895 } 4896 4897 if (Invalid) { 4898 NewFD->setInvalidDecl(); 4899 if (FunctionTemplate) 4900 FunctionTemplate->setInvalidDecl(); 4901 } 4902 4903 // C++ [dcl.fct.spec]p5: 4904 // The virtual specifier shall only be used in declarations of 4905 // nonstatic class member functions that appear within a 4906 // member-specification of a class declaration; see 10.3. 4907 // 4908 if (isVirtual && !NewFD->isInvalidDecl()) { 4909 if (!isVirtualOkay) { 4910 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4911 diag::err_virtual_non_function); 4912 } else if (!CurContext->isRecord()) { 4913 // 'virtual' was specified outside of the class. 4914 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4915 diag::err_virtual_out_of_class) 4916 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4917 } else if (NewFD->getDescribedFunctionTemplate()) { 4918 // C++ [temp.mem]p3: 4919 // A member function template shall not be virtual. 4920 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4921 diag::err_virtual_member_function_template) 4922 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4923 } else { 4924 // Okay: Add virtual to the method. 4925 NewFD->setVirtualAsWritten(true); 4926 } 4927 } 4928 4929 // C++ [dcl.fct.spec]p3: 4930 // The inline specifier shall not appear on a block scope function 4931 // declaration. 4932 if (isInline && !NewFD->isInvalidDecl()) { 4933 if (CurContext->isFunctionOrMethod()) { 4934 // 'inline' is not allowed on block scope function declaration. 4935 Diag(D.getDeclSpec().getInlineSpecLoc(), 4936 diag::err_inline_declaration_block_scope) << Name 4937 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4938 } 4939 } 4940 4941 // C++ [dcl.fct.spec]p6: 4942 // The explicit specifier shall be used only in the declaration of a 4943 // constructor or conversion function within its class definition; 4944 // see 12.3.1 and 12.3.2. 4945 if (isExplicit && !NewFD->isInvalidDecl()) { 4946 if (!CurContext->isRecord()) { 4947 // 'explicit' was specified outside of the class. 4948 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4949 diag::err_explicit_out_of_class) 4950 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4951 } else if (!isa<CXXConstructorDecl>(NewFD) && 4952 !isa<CXXConversionDecl>(NewFD)) { 4953 // 'explicit' was specified on a function that wasn't a constructor 4954 // or conversion function. 4955 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4956 diag::err_explicit_non_ctor_or_conv_function) 4957 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4958 } 4959 } 4960 4961 if (isConstexpr) { 4962 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4963 // are implicitly inline. 4964 NewFD->setImplicitlyInline(); 4965 4966 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4967 // be either constructors or to return a literal type. Therefore, 4968 // destructors cannot be declared constexpr. 4969 if (isa<CXXDestructorDecl>(NewFD)) 4970 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4971 } 4972 4973 // If __module_private__ was specified, mark the function accordingly. 4974 if (D.getDeclSpec().isModulePrivateSpecified()) { 4975 if (isFunctionTemplateSpecialization) { 4976 SourceLocation ModulePrivateLoc 4977 = D.getDeclSpec().getModulePrivateSpecLoc(); 4978 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4979 << 0 4980 << FixItHint::CreateRemoval(ModulePrivateLoc); 4981 } else { 4982 NewFD->setModulePrivate(); 4983 if (FunctionTemplate) 4984 FunctionTemplate->setModulePrivate(); 4985 } 4986 } 4987 4988 if (isFriend) { 4989 // For now, claim that the objects have no previous declaration. 4990 if (FunctionTemplate) { 4991 FunctionTemplate->setObjectOfFriendDecl(false); 4992 FunctionTemplate->setAccess(AS_public); 4993 } 4994 NewFD->setObjectOfFriendDecl(false); 4995 NewFD->setAccess(AS_public); 4996 } 4997 4998 // If a function is defined as defaulted or deleted, mark it as such now. 4999 switch (D.getFunctionDefinitionKind()) { 5000 case FDK_Declaration: 5001 case FDK_Definition: 5002 break; 5003 5004 case FDK_Defaulted: 5005 NewFD->setDefaulted(); 5006 break; 5007 5008 case FDK_Deleted: 5009 NewFD->setDeletedAsWritten(); 5010 break; 5011 } 5012 5013 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5014 D.isFunctionDefinition()) { 5015 // C++ [class.mfct]p2: 5016 // A member function may be defined (8.4) in its class definition, in 5017 // which case it is an inline member function (7.1.2) 5018 NewFD->setImplicitlyInline(); 5019 } 5020 5021 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5022 !CurContext->isRecord()) { 5023 // C++ [class.static]p1: 5024 // A data or function member of a class may be declared static 5025 // in a class definition, in which case it is a static member of 5026 // the class. 5027 5028 // Complain about the 'static' specifier if it's on an out-of-line 5029 // member function definition. 5030 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5031 diag::err_static_out_of_line) 5032 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5033 } 5034 } 5035 5036 // Filter out previous declarations that don't match the scope. 5037 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5038 isExplicitSpecialization || 5039 isFunctionTemplateSpecialization); 5040 5041 // Handle GNU asm-label extension (encoded as an attribute). 5042 if (Expr *E = (Expr*) D.getAsmLabel()) { 5043 // The parser guarantees this is a string. 5044 StringLiteral *SE = cast<StringLiteral>(E); 5045 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5046 SE->getString())); 5047 } 5048 5049 // Copy the parameter declarations from the declarator D to the function 5050 // declaration NewFD, if they are available. First scavenge them into Params. 5051 SmallVector<ParmVarDecl*, 16> Params; 5052 if (D.isFunctionDeclarator()) { 5053 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5054 5055 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5056 // function that takes no arguments, not a function that takes a 5057 // single void argument. 5058 // We let through "const void" here because Sema::GetTypeForDeclarator 5059 // already checks for that case. 5060 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5061 FTI.ArgInfo[0].Param && 5062 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5063 // Empty arg list, don't push any params. 5064 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5065 5066 // In C++, the empty parameter-type-list must be spelled "void"; a 5067 // typedef of void is not permitted. 5068 if (getLangOptions().CPlusPlus && 5069 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5070 bool IsTypeAlias = false; 5071 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5072 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5073 else if (const TemplateSpecializationType *TST = 5074 Param->getType()->getAs<TemplateSpecializationType>()) 5075 IsTypeAlias = TST->isTypeAlias(); 5076 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5077 << IsTypeAlias; 5078 } 5079 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5080 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5081 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5082 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5083 Param->setDeclContext(NewFD); 5084 Params.push_back(Param); 5085 5086 if (Param->isInvalidDecl()) 5087 NewFD->setInvalidDecl(); 5088 } 5089 } 5090 5091 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5092 // When we're declaring a function with a typedef, typeof, etc as in the 5093 // following example, we'll need to synthesize (unnamed) 5094 // parameters for use in the declaration. 5095 // 5096 // @code 5097 // typedef void fn(int); 5098 // fn f; 5099 // @endcode 5100 5101 // Synthesize a parameter for each argument type. 5102 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5103 AE = FT->arg_type_end(); AI != AE; ++AI) { 5104 ParmVarDecl *Param = 5105 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5106 Param->setScopeInfo(0, Params.size()); 5107 Params.push_back(Param); 5108 } 5109 } else { 5110 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5111 "Should not need args for typedef of non-prototype fn"); 5112 } 5113 5114 // Finally, we know we have the right number of parameters, install them. 5115 NewFD->setParams(Params); 5116 5117 // Process the non-inheritable attributes on this declaration. 5118 ProcessDeclAttributes(S, NewFD, D, 5119 /*NonInheritable=*/true, /*Inheritable=*/false); 5120 5121 if (!getLangOptions().CPlusPlus) { 5122 // Perform semantic checking on the function declaration. 5123 bool isExplicitSpecialization=false; 5124 if (!NewFD->isInvalidDecl()) { 5125 if (NewFD->getResultType()->isVariablyModifiedType()) { 5126 // Functions returning a variably modified type violate C99 6.7.5.2p2 5127 // because all functions have linkage. 5128 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5129 NewFD->setInvalidDecl(); 5130 } else { 5131 if (NewFD->isMain()) 5132 CheckMain(NewFD, D.getDeclSpec()); 5133 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5134 isExplicitSpecialization)); 5135 } 5136 } 5137 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5138 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5139 "previous declaration set still overloaded"); 5140 } else { 5141 // If the declarator is a template-id, translate the parser's template 5142 // argument list into our AST format. 5143 bool HasExplicitTemplateArgs = false; 5144 TemplateArgumentListInfo TemplateArgs; 5145 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5146 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5147 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5148 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5149 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5150 TemplateId->getTemplateArgs(), 5151 TemplateId->NumArgs); 5152 translateTemplateArguments(TemplateArgsPtr, 5153 TemplateArgs); 5154 TemplateArgsPtr.release(); 5155 5156 HasExplicitTemplateArgs = true; 5157 5158 if (NewFD->isInvalidDecl()) { 5159 HasExplicitTemplateArgs = false; 5160 } else if (FunctionTemplate) { 5161 // Function template with explicit template arguments. 5162 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5163 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5164 5165 HasExplicitTemplateArgs = false; 5166 } else if (!isFunctionTemplateSpecialization && 5167 !D.getDeclSpec().isFriendSpecified()) { 5168 // We have encountered something that the user meant to be a 5169 // specialization (because it has explicitly-specified template 5170 // arguments) but that was not introduced with a "template<>" (or had 5171 // too few of them). 5172 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5173 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5174 << FixItHint::CreateInsertion( 5175 D.getDeclSpec().getSourceRange().getBegin(), 5176 "template<> "); 5177 isFunctionTemplateSpecialization = true; 5178 } else { 5179 // "friend void foo<>(int);" is an implicit specialization decl. 5180 isFunctionTemplateSpecialization = true; 5181 } 5182 } else if (isFriend && isFunctionTemplateSpecialization) { 5183 // This combination is only possible in a recovery case; the user 5184 // wrote something like: 5185 // template <> friend void foo(int); 5186 // which we're recovering from as if the user had written: 5187 // friend void foo<>(int); 5188 // Go ahead and fake up a template id. 5189 HasExplicitTemplateArgs = true; 5190 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5191 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5192 } 5193 5194 // If it's a friend (and only if it's a friend), it's possible 5195 // that either the specialized function type or the specialized 5196 // template is dependent, and therefore matching will fail. In 5197 // this case, don't check the specialization yet. 5198 bool InstantiationDependent = false; 5199 if (isFunctionTemplateSpecialization && isFriend && 5200 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5201 TemplateSpecializationType::anyDependentTemplateArguments( 5202 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5203 InstantiationDependent))) { 5204 assert(HasExplicitTemplateArgs && 5205 "friend function specialization without template args"); 5206 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5207 Previous)) 5208 NewFD->setInvalidDecl(); 5209 } else if (isFunctionTemplateSpecialization) { 5210 if (CurContext->isDependentContext() && CurContext->isRecord() 5211 && !isFriend) { 5212 isDependentClassScopeExplicitSpecialization = true; 5213 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5214 diag::ext_function_specialization_in_class : 5215 diag::err_function_specialization_in_class) 5216 << NewFD->getDeclName(); 5217 } else if (CheckFunctionTemplateSpecialization(NewFD, 5218 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5219 Previous)) 5220 NewFD->setInvalidDecl(); 5221 5222 // C++ [dcl.stc]p1: 5223 // A storage-class-specifier shall not be specified in an explicit 5224 // specialization (14.7.3) 5225 if (SC != SC_None) { 5226 if (SC != NewFD->getStorageClass()) 5227 Diag(NewFD->getLocation(), 5228 diag::err_explicit_specialization_inconsistent_storage_class) 5229 << SC 5230 << FixItHint::CreateRemoval( 5231 D.getDeclSpec().getStorageClassSpecLoc()); 5232 5233 else 5234 Diag(NewFD->getLocation(), 5235 diag::ext_explicit_specialization_storage_class) 5236 << FixItHint::CreateRemoval( 5237 D.getDeclSpec().getStorageClassSpecLoc()); 5238 } 5239 5240 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5241 if (CheckMemberSpecialization(NewFD, Previous)) 5242 NewFD->setInvalidDecl(); 5243 } 5244 5245 // Perform semantic checking on the function declaration. 5246 if (!isDependentClassScopeExplicitSpecialization) { 5247 if (NewFD->isInvalidDecl()) { 5248 // If this is a class member, mark the class invalid immediately. 5249 // This avoids some consistency errors later. 5250 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5251 methodDecl->getParent()->setInvalidDecl(); 5252 } else { 5253 if (NewFD->isMain()) 5254 CheckMain(NewFD, D.getDeclSpec()); 5255 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5256 isExplicitSpecialization)); 5257 } 5258 } 5259 5260 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5261 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5262 "previous declaration set still overloaded"); 5263 5264 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5265 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5266 NewFD->setInvalidDecl(); 5267 5268 NamedDecl *PrincipalDecl = (FunctionTemplate 5269 ? cast<NamedDecl>(FunctionTemplate) 5270 : NewFD); 5271 5272 if (isFriend && D.isRedeclaration()) { 5273 AccessSpecifier Access = AS_public; 5274 if (!NewFD->isInvalidDecl()) 5275 Access = NewFD->getPreviousDeclaration()->getAccess(); 5276 5277 NewFD->setAccess(Access); 5278 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5279 5280 PrincipalDecl->setObjectOfFriendDecl(true); 5281 } 5282 5283 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5284 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5285 PrincipalDecl->setNonMemberOperator(); 5286 5287 // If we have a function template, check the template parameter 5288 // list. This will check and merge default template arguments. 5289 if (FunctionTemplate) { 5290 FunctionTemplateDecl *PrevTemplate = 5291 FunctionTemplate->getPreviousDeclaration(); 5292 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5293 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5294 D.getDeclSpec().isFriendSpecified() 5295 ? (D.isFunctionDefinition() 5296 ? TPC_FriendFunctionTemplateDefinition 5297 : TPC_FriendFunctionTemplate) 5298 : (D.getCXXScopeSpec().isSet() && 5299 DC && DC->isRecord() && 5300 DC->isDependentContext()) 5301 ? TPC_ClassTemplateMember 5302 : TPC_FunctionTemplate); 5303 } 5304 5305 if (NewFD->isInvalidDecl()) { 5306 // Ignore all the rest of this. 5307 } else if (!D.isRedeclaration()) { 5308 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5309 AddToScope }; 5310 // Fake up an access specifier if it's supposed to be a class member. 5311 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5312 NewFD->setAccess(AS_public); 5313 5314 // Qualified decls generally require a previous declaration. 5315 if (D.getCXXScopeSpec().isSet()) { 5316 // ...with the major exception of templated-scope or 5317 // dependent-scope friend declarations. 5318 5319 // TODO: we currently also suppress this check in dependent 5320 // contexts because (1) the parameter depth will be off when 5321 // matching friend templates and (2) we might actually be 5322 // selecting a friend based on a dependent factor. But there 5323 // are situations where these conditions don't apply and we 5324 // can actually do this check immediately. 5325 if (isFriend && 5326 (TemplateParamLists.size() || 5327 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5328 CurContext->isDependentContext())) { 5329 // ignore these 5330 } else { 5331 // The user tried to provide an out-of-line definition for a 5332 // function that is a member of a class or namespace, but there 5333 // was no such member function declared (C++ [class.mfct]p2, 5334 // C++ [namespace.memdef]p2). For example: 5335 // 5336 // class X { 5337 // void f() const; 5338 // }; 5339 // 5340 // void X::f() { } // ill-formed 5341 // 5342 // Complain about this problem, and attempt to suggest close 5343 // matches (e.g., those that differ only in cv-qualifiers and 5344 // whether the parameter types are references). 5345 5346 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5347 NewFD, 5348 ExtraArgs)) { 5349 AddToScope = ExtraArgs.AddToScope; 5350 return Result; 5351 } 5352 } 5353 5354 // Unqualified local friend declarations are required to resolve 5355 // to something. 5356 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5357 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5358 NewFD, 5359 ExtraArgs)) { 5360 AddToScope = ExtraArgs.AddToScope; 5361 return Result; 5362 } 5363 } 5364 5365 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5366 !isFriend && !isFunctionTemplateSpecialization && 5367 !isExplicitSpecialization) { 5368 // An out-of-line member function declaration must also be a 5369 // definition (C++ [dcl.meaning]p1). 5370 // Note that this is not the case for explicit specializations of 5371 // function templates or member functions of class templates, per 5372 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5373 // extension for compatibility with old SWIG code which likes to 5374 // generate them. 5375 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5376 << D.getCXXScopeSpec().getRange(); 5377 } 5378 } 5379 5380 5381 // Handle attributes. We need to have merged decls when handling attributes 5382 // (for example to check for conflicts, etc). 5383 // FIXME: This needs to happen before we merge declarations. Then, 5384 // let attribute merging cope with attribute conflicts. 5385 ProcessDeclAttributes(S, NewFD, D, 5386 /*NonInheritable=*/false, /*Inheritable=*/true); 5387 5388 // attributes declared post-definition are currently ignored 5389 // FIXME: This should happen during attribute merging 5390 if (D.isRedeclaration() && Previous.isSingleResult()) { 5391 const FunctionDecl *Def; 5392 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5393 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5394 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5395 Diag(Def->getLocation(), diag::note_previous_definition); 5396 } 5397 } 5398 5399 AddKnownFunctionAttributes(NewFD); 5400 5401 if (NewFD->hasAttr<OverloadableAttr>() && 5402 !NewFD->getType()->getAs<FunctionProtoType>()) { 5403 Diag(NewFD->getLocation(), 5404 diag::err_attribute_overloadable_no_prototype) 5405 << NewFD; 5406 5407 // Turn this into a variadic function with no parameters. 5408 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5409 FunctionProtoType::ExtProtoInfo EPI; 5410 EPI.Variadic = true; 5411 EPI.ExtInfo = FT->getExtInfo(); 5412 5413 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5414 NewFD->setType(R); 5415 } 5416 5417 // If there's a #pragma GCC visibility in scope, and this isn't a class 5418 // member, set the visibility of this function. 5419 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5420 AddPushedVisibilityAttribute(NewFD); 5421 5422 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5423 // marking the function. 5424 AddCFAuditedAttribute(NewFD); 5425 5426 // If this is a locally-scoped extern C function, update the 5427 // map of such names. 5428 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5429 && !NewFD->isInvalidDecl()) 5430 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5431 5432 // Set this FunctionDecl's range up to the right paren. 5433 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5434 5435 if (getLangOptions().CPlusPlus) { 5436 if (FunctionTemplate) { 5437 if (NewFD->isInvalidDecl()) 5438 FunctionTemplate->setInvalidDecl(); 5439 return FunctionTemplate; 5440 } 5441 } 5442 5443 MarkUnusedFileScopedDecl(NewFD); 5444 5445 if (getLangOptions().CUDA) 5446 if (IdentifierInfo *II = NewFD->getIdentifier()) 5447 if (!NewFD->isInvalidDecl() && 5448 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5449 if (II->isStr("cudaConfigureCall")) { 5450 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5451 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5452 5453 Context.setcudaConfigureCallDecl(NewFD); 5454 } 5455 } 5456 5457 // Here we have an function template explicit specialization at class scope. 5458 // The actually specialization will be postponed to template instatiation 5459 // time via the ClassScopeFunctionSpecializationDecl node. 5460 if (isDependentClassScopeExplicitSpecialization) { 5461 ClassScopeFunctionSpecializationDecl *NewSpec = 5462 ClassScopeFunctionSpecializationDecl::Create( 5463 Context, CurContext, SourceLocation(), 5464 cast<CXXMethodDecl>(NewFD)); 5465 CurContext->addDecl(NewSpec); 5466 AddToScope = false; 5467 } 5468 5469 return NewFD; 5470} 5471 5472/// \brief Perform semantic checking of a new function declaration. 5473/// 5474/// Performs semantic analysis of the new function declaration 5475/// NewFD. This routine performs all semantic checking that does not 5476/// require the actual declarator involved in the declaration, and is 5477/// used both for the declaration of functions as they are parsed 5478/// (called via ActOnDeclarator) and for the declaration of functions 5479/// that have been instantiated via C++ template instantiation (called 5480/// via InstantiateDecl). 5481/// 5482/// \param IsExplicitSpecialiation whether this new function declaration is 5483/// an explicit specialization of the previous declaration. 5484/// 5485/// This sets NewFD->isInvalidDecl() to true if there was an error. 5486/// 5487/// Returns true if the function declaration is a redeclaration. 5488bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5489 LookupResult &Previous, 5490 bool IsExplicitSpecialization) { 5491 assert(!NewFD->getResultType()->isVariablyModifiedType() 5492 && "Variably modified return types are not handled here"); 5493 5494 // Check for a previous declaration of this name. 5495 if (Previous.empty() && NewFD->isExternC()) { 5496 // Since we did not find anything by this name and we're declaring 5497 // an extern "C" function, look for a non-visible extern "C" 5498 // declaration with the same name. 5499 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5500 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5501 if (Pos != LocallyScopedExternalDecls.end()) 5502 Previous.addDecl(Pos->second); 5503 } 5504 5505 bool Redeclaration = false; 5506 5507 // Merge or overload the declaration with an existing declaration of 5508 // the same name, if appropriate. 5509 if (!Previous.empty()) { 5510 // Determine whether NewFD is an overload of PrevDecl or 5511 // a declaration that requires merging. If it's an overload, 5512 // there's no more work to do here; we'll just add the new 5513 // function to the scope. 5514 5515 NamedDecl *OldDecl = 0; 5516 if (!AllowOverloadingOfFunction(Previous, Context)) { 5517 Redeclaration = true; 5518 OldDecl = Previous.getFoundDecl(); 5519 } else { 5520 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5521 /*NewIsUsingDecl*/ false)) { 5522 case Ovl_Match: 5523 Redeclaration = true; 5524 break; 5525 5526 case Ovl_NonFunction: 5527 Redeclaration = true; 5528 break; 5529 5530 case Ovl_Overload: 5531 Redeclaration = false; 5532 break; 5533 } 5534 5535 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5536 // If a function name is overloadable in C, then every function 5537 // with that name must be marked "overloadable". 5538 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5539 << Redeclaration << NewFD; 5540 NamedDecl *OverloadedDecl = 0; 5541 if (Redeclaration) 5542 OverloadedDecl = OldDecl; 5543 else if (!Previous.empty()) 5544 OverloadedDecl = Previous.getRepresentativeDecl(); 5545 if (OverloadedDecl) 5546 Diag(OverloadedDecl->getLocation(), 5547 diag::note_attribute_overloadable_prev_overload); 5548 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5549 Context)); 5550 } 5551 } 5552 5553 if (Redeclaration) { 5554 // NewFD and OldDecl represent declarations that need to be 5555 // merged. 5556 if (MergeFunctionDecl(NewFD, OldDecl)) { 5557 NewFD->setInvalidDecl(); 5558 return Redeclaration; 5559 } 5560 5561 Previous.clear(); 5562 Previous.addDecl(OldDecl); 5563 5564 if (FunctionTemplateDecl *OldTemplateDecl 5565 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5566 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5567 FunctionTemplateDecl *NewTemplateDecl 5568 = NewFD->getDescribedFunctionTemplate(); 5569 assert(NewTemplateDecl && "Template/non-template mismatch"); 5570 if (CXXMethodDecl *Method 5571 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5572 Method->setAccess(OldTemplateDecl->getAccess()); 5573 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5574 } 5575 5576 // If this is an explicit specialization of a member that is a function 5577 // template, mark it as a member specialization. 5578 if (IsExplicitSpecialization && 5579 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5580 NewTemplateDecl->setMemberSpecialization(); 5581 assert(OldTemplateDecl->isMemberSpecialization()); 5582 } 5583 5584 if (OldTemplateDecl->isModulePrivate()) 5585 NewTemplateDecl->setModulePrivate(); 5586 5587 } else { 5588 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5589 NewFD->setAccess(OldDecl->getAccess()); 5590 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5591 } 5592 } 5593 } 5594 5595 // Semantic checking for this function declaration (in isolation). 5596 if (getLangOptions().CPlusPlus) { 5597 // C++-specific checks. 5598 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5599 CheckConstructor(Constructor); 5600 } else if (CXXDestructorDecl *Destructor = 5601 dyn_cast<CXXDestructorDecl>(NewFD)) { 5602 CXXRecordDecl *Record = Destructor->getParent(); 5603 QualType ClassType = Context.getTypeDeclType(Record); 5604 5605 // FIXME: Shouldn't we be able to perform this check even when the class 5606 // type is dependent? Both gcc and edg can handle that. 5607 if (!ClassType->isDependentType()) { 5608 DeclarationName Name 5609 = Context.DeclarationNames.getCXXDestructorName( 5610 Context.getCanonicalType(ClassType)); 5611 if (NewFD->getDeclName() != Name) { 5612 Diag(NewFD->getLocation(), diag::err_destructor_name); 5613 NewFD->setInvalidDecl(); 5614 return Redeclaration; 5615 } 5616 } 5617 } else if (CXXConversionDecl *Conversion 5618 = dyn_cast<CXXConversionDecl>(NewFD)) { 5619 ActOnConversionDeclarator(Conversion); 5620 } 5621 5622 // Find any virtual functions that this function overrides. 5623 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5624 if (!Method->isFunctionTemplateSpecialization() && 5625 !Method->getDescribedFunctionTemplate()) { 5626 if (AddOverriddenMethods(Method->getParent(), Method)) { 5627 // If the function was marked as "static", we have a problem. 5628 if (NewFD->getStorageClass() == SC_Static) { 5629 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5630 << NewFD->getDeclName(); 5631 for (CXXMethodDecl::method_iterator 5632 Overridden = Method->begin_overridden_methods(), 5633 OverriddenEnd = Method->end_overridden_methods(); 5634 Overridden != OverriddenEnd; 5635 ++Overridden) { 5636 Diag((*Overridden)->getLocation(), 5637 diag::note_overridden_virtual_function); 5638 } 5639 } 5640 } 5641 } 5642 } 5643 5644 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5645 if (NewFD->isOverloadedOperator() && 5646 CheckOverloadedOperatorDeclaration(NewFD)) { 5647 NewFD->setInvalidDecl(); 5648 return Redeclaration; 5649 } 5650 5651 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5652 if (NewFD->getLiteralIdentifier() && 5653 CheckLiteralOperatorDeclaration(NewFD)) { 5654 NewFD->setInvalidDecl(); 5655 return Redeclaration; 5656 } 5657 5658 // In C++, check default arguments now that we have merged decls. Unless 5659 // the lexical context is the class, because in this case this is done 5660 // during delayed parsing anyway. 5661 if (!CurContext->isRecord()) 5662 CheckCXXDefaultArguments(NewFD); 5663 5664 // If this function declares a builtin function, check the type of this 5665 // declaration against the expected type for the builtin. 5666 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5667 ASTContext::GetBuiltinTypeError Error; 5668 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5669 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5670 // The type of this function differs from the type of the builtin, 5671 // so forget about the builtin entirely. 5672 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5673 } 5674 } 5675 } 5676 return Redeclaration; 5677} 5678 5679void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5680 // C++ [basic.start.main]p3: A program that declares main to be inline 5681 // or static is ill-formed. 5682 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5683 // shall not appear in a declaration of main. 5684 // static main is not an error under C99, but we should warn about it. 5685 if (FD->getStorageClass() == SC_Static) 5686 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5687 ? diag::err_static_main : diag::warn_static_main) 5688 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5689 if (FD->isInlineSpecified()) 5690 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5691 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5692 5693 QualType T = FD->getType(); 5694 assert(T->isFunctionType() && "function decl is not of function type"); 5695 const FunctionType* FT = T->getAs<FunctionType>(); 5696 5697 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5698 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5699 FD->setInvalidDecl(true); 5700 } 5701 5702 // Treat protoless main() as nullary. 5703 if (isa<FunctionNoProtoType>(FT)) return; 5704 5705 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5706 unsigned nparams = FTP->getNumArgs(); 5707 assert(FD->getNumParams() == nparams); 5708 5709 bool HasExtraParameters = (nparams > 3); 5710 5711 // Darwin passes an undocumented fourth argument of type char**. If 5712 // other platforms start sprouting these, the logic below will start 5713 // getting shifty. 5714 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5715 HasExtraParameters = false; 5716 5717 if (HasExtraParameters) { 5718 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5719 FD->setInvalidDecl(true); 5720 nparams = 3; 5721 } 5722 5723 // FIXME: a lot of the following diagnostics would be improved 5724 // if we had some location information about types. 5725 5726 QualType CharPP = 5727 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5728 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5729 5730 for (unsigned i = 0; i < nparams; ++i) { 5731 QualType AT = FTP->getArgType(i); 5732 5733 bool mismatch = true; 5734 5735 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5736 mismatch = false; 5737 else if (Expected[i] == CharPP) { 5738 // As an extension, the following forms are okay: 5739 // char const ** 5740 // char const * const * 5741 // char * const * 5742 5743 QualifierCollector qs; 5744 const PointerType* PT; 5745 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5746 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5747 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5748 qs.removeConst(); 5749 mismatch = !qs.empty(); 5750 } 5751 } 5752 5753 if (mismatch) { 5754 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5755 // TODO: suggest replacing given type with expected type 5756 FD->setInvalidDecl(true); 5757 } 5758 } 5759 5760 if (nparams == 1 && !FD->isInvalidDecl()) { 5761 Diag(FD->getLocation(), diag::warn_main_one_arg); 5762 } 5763 5764 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5765 Diag(FD->getLocation(), diag::err_main_template_decl); 5766 FD->setInvalidDecl(); 5767 } 5768} 5769 5770bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5771 // FIXME: Need strict checking. In C89, we need to check for 5772 // any assignment, increment, decrement, function-calls, or 5773 // commas outside of a sizeof. In C99, it's the same list, 5774 // except that the aforementioned are allowed in unevaluated 5775 // expressions. Everything else falls under the 5776 // "may accept other forms of constant expressions" exception. 5777 // (We never end up here for C++, so the constant expression 5778 // rules there don't matter.) 5779 if (Init->isConstantInitializer(Context, false)) 5780 return false; 5781 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5782 << Init->getSourceRange(); 5783 return true; 5784} 5785 5786namespace { 5787 // Visits an initialization expression to see if OrigDecl is evaluated in 5788 // its own initialization and throws a warning if it does. 5789 class SelfReferenceChecker 5790 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5791 Sema &S; 5792 Decl *OrigDecl; 5793 bool isRecordType; 5794 bool isPODType; 5795 5796 public: 5797 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5798 5799 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5800 S(S), OrigDecl(OrigDecl) { 5801 isPODType = false; 5802 isRecordType = false; 5803 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5804 isPODType = VD->getType().isPODType(S.Context); 5805 isRecordType = VD->getType()->isRecordType(); 5806 } 5807 } 5808 5809 void VisitExpr(Expr *E) { 5810 if (isa<ObjCMessageExpr>(*E)) return; 5811 if (isRecordType) { 5812 Expr *expr = E; 5813 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5814 ValueDecl *VD = ME->getMemberDecl(); 5815 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5816 expr = ME->getBase(); 5817 } 5818 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5819 HandleDeclRefExpr(DRE); 5820 return; 5821 } 5822 } 5823 Inherited::VisitExpr(E); 5824 } 5825 5826 void VisitMemberExpr(MemberExpr *E) { 5827 if (E->getType()->canDecayToPointerType()) return; 5828 if (isa<FieldDecl>(E->getMemberDecl())) 5829 if (DeclRefExpr *DRE 5830 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5831 HandleDeclRefExpr(DRE); 5832 return; 5833 } 5834 Inherited::VisitMemberExpr(E); 5835 } 5836 5837 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5838 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5839 (isRecordType && E->getCastKind() == CK_NoOp)) { 5840 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5841 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5842 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5843 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5844 HandleDeclRefExpr(DRE); 5845 return; 5846 } 5847 } 5848 Inherited::VisitImplicitCastExpr(E); 5849 } 5850 5851 void VisitUnaryOperator(UnaryOperator *E) { 5852 // For POD record types, addresses of its own members are well-defined. 5853 if (isRecordType && isPODType) return; 5854 Inherited::VisitUnaryOperator(E); 5855 } 5856 5857 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5858 Decl* ReferenceDecl = DRE->getDecl(); 5859 if (OrigDecl != ReferenceDecl) return; 5860 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5861 Sema::NotForRedeclaration); 5862 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5863 S.PDiag(diag::warn_uninit_self_reference_in_init) 5864 << Result.getLookupName() 5865 << OrigDecl->getLocation() 5866 << DRE->getSourceRange()); 5867 } 5868 }; 5869} 5870 5871/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5872void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5873 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5874} 5875 5876/// AddInitializerToDecl - Adds the initializer Init to the 5877/// declaration dcl. If DirectInit is true, this is C++ direct 5878/// initialization rather than copy initialization. 5879void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5880 bool DirectInit, bool TypeMayContainAuto) { 5881 // If there is no declaration, there was an error parsing it. Just ignore 5882 // the initializer. 5883 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5884 return; 5885 5886 // Check for self-references within variable initializers. 5887 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5888 // Variables declared within a function/method body are handled 5889 // by a dataflow analysis. 5890 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5891 CheckSelfReference(RealDecl, Init); 5892 } 5893 else { 5894 CheckSelfReference(RealDecl, Init); 5895 } 5896 5897 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5898 // With declarators parsed the way they are, the parser cannot 5899 // distinguish between a normal initializer and a pure-specifier. 5900 // Thus this grotesque test. 5901 IntegerLiteral *IL; 5902 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5903 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5904 CheckPureMethod(Method, Init->getSourceRange()); 5905 else { 5906 Diag(Method->getLocation(), diag::err_member_function_initialization) 5907 << Method->getDeclName() << Init->getSourceRange(); 5908 Method->setInvalidDecl(); 5909 } 5910 return; 5911 } 5912 5913 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5914 if (!VDecl) { 5915 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5916 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5917 RealDecl->setInvalidDecl(); 5918 return; 5919 } 5920 5921 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5922 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5923 TypeSourceInfo *DeducedType = 0; 5924 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5925 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5926 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5927 << Init->getSourceRange(); 5928 if (!DeducedType) { 5929 RealDecl->setInvalidDecl(); 5930 return; 5931 } 5932 VDecl->setTypeSourceInfo(DeducedType); 5933 VDecl->setType(DeducedType->getType()); 5934 5935 // In ARC, infer lifetime. 5936 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5937 VDecl->setInvalidDecl(); 5938 5939 // If this is a redeclaration, check that the type we just deduced matches 5940 // the previously declared type. 5941 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5942 MergeVarDeclTypes(VDecl, Old); 5943 } 5944 5945 5946 // A definition must end up with a complete type, which means it must be 5947 // complete with the restriction that an array type might be completed by the 5948 // initializer; note that later code assumes this restriction. 5949 QualType BaseDeclType = VDecl->getType(); 5950 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5951 BaseDeclType = Array->getElementType(); 5952 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5953 diag::err_typecheck_decl_incomplete_type)) { 5954 RealDecl->setInvalidDecl(); 5955 return; 5956 } 5957 5958 // The variable can not have an abstract class type. 5959 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5960 diag::err_abstract_type_in_decl, 5961 AbstractVariableType)) 5962 VDecl->setInvalidDecl(); 5963 5964 const VarDecl *Def; 5965 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5966 Diag(VDecl->getLocation(), diag::err_redefinition) 5967 << VDecl->getDeclName(); 5968 Diag(Def->getLocation(), diag::note_previous_definition); 5969 VDecl->setInvalidDecl(); 5970 return; 5971 } 5972 5973 const VarDecl* PrevInit = 0; 5974 if (getLangOptions().CPlusPlus) { 5975 // C++ [class.static.data]p4 5976 // If a static data member is of const integral or const 5977 // enumeration type, its declaration in the class definition can 5978 // specify a constant-initializer which shall be an integral 5979 // constant expression (5.19). In that case, the member can appear 5980 // in integral constant expressions. The member shall still be 5981 // defined in a namespace scope if it is used in the program and the 5982 // namespace scope definition shall not contain an initializer. 5983 // 5984 // We already performed a redefinition check above, but for static 5985 // data members we also need to check whether there was an in-class 5986 // declaration with an initializer. 5987 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5988 Diag(VDecl->getLocation(), diag::err_redefinition) 5989 << VDecl->getDeclName(); 5990 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5991 return; 5992 } 5993 5994 if (VDecl->hasLocalStorage()) 5995 getCurFunction()->setHasBranchProtectedScope(); 5996 5997 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5998 VDecl->setInvalidDecl(); 5999 return; 6000 } 6001 } 6002 6003 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6004 // a kernel function cannot be initialized." 6005 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6006 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6007 VDecl->setInvalidDecl(); 6008 return; 6009 } 6010 6011 // Capture the variable that is being initialized and the style of 6012 // initialization. 6013 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6014 6015 // FIXME: Poor source location information. 6016 InitializationKind Kind 6017 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 6018 Init->getLocStart(), 6019 Init->getLocEnd()) 6020 : InitializationKind::CreateCopy(VDecl->getLocation(), 6021 Init->getLocStart()); 6022 6023 // Get the decls type and save a reference for later, since 6024 // CheckInitializerTypes may change it. 6025 QualType DclT = VDecl->getType(), SavT = DclT; 6026 if (VDecl->isLocalVarDecl()) { 6027 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 6028 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6029 VDecl->setInvalidDecl(); 6030 } else if (!VDecl->isInvalidDecl()) { 6031 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6032 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6033 MultiExprArg(*this, &Init, 1), 6034 &DclT); 6035 if (Result.isInvalid()) { 6036 VDecl->setInvalidDecl(); 6037 return; 6038 } 6039 6040 Init = Result.takeAs<Expr>(); 6041 6042 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6043 // Don't check invalid declarations to avoid emitting useless diagnostics. 6044 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6045 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6046 CheckForConstantInitializer(Init, DclT); 6047 } 6048 } 6049 } else if (VDecl->isStaticDataMember() && 6050 VDecl->getLexicalDeclContext()->isRecord()) { 6051 // This is an in-class initialization for a static data member, e.g., 6052 // 6053 // struct S { 6054 // static const int value = 17; 6055 // }; 6056 6057 // Try to perform the initialization regardless. 6058 if (!VDecl->isInvalidDecl()) { 6059 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6060 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6061 MultiExprArg(*this, &Init, 1), 6062 &DclT); 6063 if (Result.isInvalid()) { 6064 VDecl->setInvalidDecl(); 6065 return; 6066 } 6067 6068 Init = Result.takeAs<Expr>(); 6069 } 6070 6071 // C++ [class.mem]p4: 6072 // A member-declarator can contain a constant-initializer only 6073 // if it declares a static member (9.4) of const integral or 6074 // const enumeration type, see 9.4.2. 6075 // 6076 // C++0x [class.static.data]p3: 6077 // If a non-volatile const static data member is of integral or 6078 // enumeration type, its declaration in the class definition can 6079 // specify a brace-or-equal-initializer in which every initalizer-clause 6080 // that is an assignment-expression is a constant expression. A static 6081 // data member of literal type can be declared in the class definition 6082 // with the constexpr specifier; if so, its declaration shall specify a 6083 // brace-or-equal-initializer in which every initializer-clause that is 6084 // an assignment-expression is a constant expression. 6085 QualType T = VDecl->getType(); 6086 6087 // Do nothing on dependent types. 6088 if (T->isDependentType()) { 6089 6090 // Allow any 'static constexpr' members, whether or not they are of literal 6091 // type. We separately check that the initializer is a constant expression, 6092 // which implicitly requires the member to be of literal type. 6093 } else if (VDecl->isConstexpr()) { 6094 6095 // Require constness. 6096 } else if (!T.isConstQualified()) { 6097 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6098 << Init->getSourceRange(); 6099 VDecl->setInvalidDecl(); 6100 6101 // We allow integer constant expressions in all cases. 6102 } else if (T->isIntegralOrEnumerationType()) { 6103 // Check whether the expression is a constant expression. 6104 SourceLocation Loc; 6105 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6106 // In C++0x, a non-constexpr const static data member with an 6107 // in-class initializer cannot be volatile. 6108 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6109 else if (Init->isValueDependent()) 6110 ; // Nothing to check. 6111 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6112 ; // Ok, it's an ICE! 6113 else if (Init->isEvaluatable(Context)) { 6114 // If we can constant fold the initializer through heroics, accept it, 6115 // but report this as a use of an extension for -pedantic. 6116 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6117 << Init->getSourceRange(); 6118 } else { 6119 // Otherwise, this is some crazy unknown case. Report the issue at the 6120 // location provided by the isIntegerConstantExpr failed check. 6121 Diag(Loc, diag::err_in_class_initializer_non_constant) 6122 << Init->getSourceRange(); 6123 VDecl->setInvalidDecl(); 6124 } 6125 6126 // We allow floating-point constants as an extension. 6127 } else if (T->isFloatingType()) { // also permits complex, which is ok 6128 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6129 << T << Init->getSourceRange(); 6130 if (getLangOptions().CPlusPlus0x) 6131 Diag(VDecl->getLocation(), 6132 diag::note_in_class_initializer_float_type_constexpr) 6133 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6134 6135 if (!Init->isValueDependent() && 6136 !Init->isConstantInitializer(Context, false)) { 6137 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6138 << Init->getSourceRange(); 6139 VDecl->setInvalidDecl(); 6140 } 6141 6142 // Suggest adding 'constexpr' in C++0x for literal types. 6143 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6144 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6145 << T << Init->getSourceRange() 6146 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6147 VDecl->setConstexpr(true); 6148 6149 } else { 6150 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6151 << T << Init->getSourceRange(); 6152 VDecl->setInvalidDecl(); 6153 } 6154 } else if (VDecl->isFileVarDecl()) { 6155 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6156 (!getLangOptions().CPlusPlus || 6157 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6158 Diag(VDecl->getLocation(), diag::warn_extern_init); 6159 if (!VDecl->isInvalidDecl()) { 6160 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6161 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6162 MultiExprArg(*this, &Init, 1), 6163 &DclT); 6164 if (Result.isInvalid()) { 6165 VDecl->setInvalidDecl(); 6166 return; 6167 } 6168 6169 Init = Result.takeAs<Expr>(); 6170 } 6171 6172 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6173 // Don't check invalid declarations to avoid emitting useless diagnostics. 6174 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6175 // C99 6.7.8p4. All file scoped initializers need to be constant. 6176 CheckForConstantInitializer(Init, DclT); 6177 } 6178 } 6179 // If the type changed, it means we had an incomplete type that was 6180 // completed by the initializer. For example: 6181 // int ary[] = { 1, 3, 5 }; 6182 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6183 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6184 VDecl->setType(DclT); 6185 Init->setType(DclT); 6186 } 6187 6188 // Check any implicit conversions within the expression. 6189 CheckImplicitConversions(Init, VDecl->getLocation()); 6190 6191 if (!VDecl->isInvalidDecl()) 6192 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6193 6194 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6195 !VDecl->getType()->isDependentType() && 6196 !Init->isTypeDependent() && !Init->isValueDependent() && 6197 !Init->isConstantInitializer(Context, 6198 VDecl->getType()->isReferenceType())) { 6199 // FIXME: Improve this diagnostic to explain why the initializer is not 6200 // a constant expression. 6201 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6202 << VDecl << Init->getSourceRange(); 6203 } 6204 6205 Init = MaybeCreateExprWithCleanups(Init); 6206 // Attach the initializer to the decl. 6207 VDecl->setInit(Init); 6208 6209 CheckCompleteVariableDeclaration(VDecl); 6210} 6211 6212/// ActOnInitializerError - Given that there was an error parsing an 6213/// initializer for the given declaration, try to return to some form 6214/// of sanity. 6215void Sema::ActOnInitializerError(Decl *D) { 6216 // Our main concern here is re-establishing invariants like "a 6217 // variable's type is either dependent or complete". 6218 if (!D || D->isInvalidDecl()) return; 6219 6220 VarDecl *VD = dyn_cast<VarDecl>(D); 6221 if (!VD) return; 6222 6223 // Auto types are meaningless if we can't make sense of the initializer. 6224 if (ParsingInitForAutoVars.count(D)) { 6225 D->setInvalidDecl(); 6226 return; 6227 } 6228 6229 QualType Ty = VD->getType(); 6230 if (Ty->isDependentType()) return; 6231 6232 // Require a complete type. 6233 if (RequireCompleteType(VD->getLocation(), 6234 Context.getBaseElementType(Ty), 6235 diag::err_typecheck_decl_incomplete_type)) { 6236 VD->setInvalidDecl(); 6237 return; 6238 } 6239 6240 // Require an abstract type. 6241 if (RequireNonAbstractType(VD->getLocation(), Ty, 6242 diag::err_abstract_type_in_decl, 6243 AbstractVariableType)) { 6244 VD->setInvalidDecl(); 6245 return; 6246 } 6247 6248 // Don't bother complaining about constructors or destructors, 6249 // though. 6250} 6251 6252void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6253 bool TypeMayContainAuto) { 6254 // If there is no declaration, there was an error parsing it. Just ignore it. 6255 if (RealDecl == 0) 6256 return; 6257 6258 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6259 QualType Type = Var->getType(); 6260 6261 // C++0x [dcl.spec.auto]p3 6262 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6263 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6264 << Var->getDeclName() << Type; 6265 Var->setInvalidDecl(); 6266 return; 6267 } 6268 6269 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6270 // have an initializer. 6271 // C++0x [class.static.data]p3: A static data member can be declared with 6272 // the constexpr specifier; if so, its declaration shall specify 6273 // a brace-or-equal-initializer. 6274 // 6275 // A static data member's definition may inherit an initializer from an 6276 // in-class declaration. 6277 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6278 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6279 << Var->getDeclName(); 6280 Var->setInvalidDecl(); 6281 return; 6282 } 6283 6284 switch (Var->isThisDeclarationADefinition()) { 6285 case VarDecl::Definition: 6286 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6287 break; 6288 6289 // We have an out-of-line definition of a static data member 6290 // that has an in-class initializer, so we type-check this like 6291 // a declaration. 6292 // 6293 // Fall through 6294 6295 case VarDecl::DeclarationOnly: 6296 // It's only a declaration. 6297 6298 // Block scope. C99 6.7p7: If an identifier for an object is 6299 // declared with no linkage (C99 6.2.2p6), the type for the 6300 // object shall be complete. 6301 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6302 !Var->getLinkage() && !Var->isInvalidDecl() && 6303 RequireCompleteType(Var->getLocation(), Type, 6304 diag::err_typecheck_decl_incomplete_type)) 6305 Var->setInvalidDecl(); 6306 6307 // Make sure that the type is not abstract. 6308 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6309 RequireNonAbstractType(Var->getLocation(), Type, 6310 diag::err_abstract_type_in_decl, 6311 AbstractVariableType)) 6312 Var->setInvalidDecl(); 6313 return; 6314 6315 case VarDecl::TentativeDefinition: 6316 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6317 // object that has file scope without an initializer, and without a 6318 // storage-class specifier or with the storage-class specifier "static", 6319 // constitutes a tentative definition. Note: A tentative definition with 6320 // external linkage is valid (C99 6.2.2p5). 6321 if (!Var->isInvalidDecl()) { 6322 if (const IncompleteArrayType *ArrayT 6323 = Context.getAsIncompleteArrayType(Type)) { 6324 if (RequireCompleteType(Var->getLocation(), 6325 ArrayT->getElementType(), 6326 diag::err_illegal_decl_array_incomplete_type)) 6327 Var->setInvalidDecl(); 6328 } else if (Var->getStorageClass() == SC_Static) { 6329 // C99 6.9.2p3: If the declaration of an identifier for an object is 6330 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6331 // declared type shall not be an incomplete type. 6332 // NOTE: code such as the following 6333 // static struct s; 6334 // struct s { int a; }; 6335 // is accepted by gcc. Hence here we issue a warning instead of 6336 // an error and we do not invalidate the static declaration. 6337 // NOTE: to avoid multiple warnings, only check the first declaration. 6338 if (Var->getPreviousDeclaration() == 0) 6339 RequireCompleteType(Var->getLocation(), Type, 6340 diag::ext_typecheck_decl_incomplete_type); 6341 } 6342 } 6343 6344 // Record the tentative definition; we're done. 6345 if (!Var->isInvalidDecl()) 6346 TentativeDefinitions.push_back(Var); 6347 return; 6348 } 6349 6350 // Provide a specific diagnostic for uninitialized variable 6351 // definitions with incomplete array type. 6352 if (Type->isIncompleteArrayType()) { 6353 Diag(Var->getLocation(), 6354 diag::err_typecheck_incomplete_array_needs_initializer); 6355 Var->setInvalidDecl(); 6356 return; 6357 } 6358 6359 // Provide a specific diagnostic for uninitialized variable 6360 // definitions with reference type. 6361 if (Type->isReferenceType()) { 6362 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6363 << Var->getDeclName() 6364 << SourceRange(Var->getLocation(), Var->getLocation()); 6365 Var->setInvalidDecl(); 6366 return; 6367 } 6368 6369 // Do not attempt to type-check the default initializer for a 6370 // variable with dependent type. 6371 if (Type->isDependentType()) 6372 return; 6373 6374 if (Var->isInvalidDecl()) 6375 return; 6376 6377 if (RequireCompleteType(Var->getLocation(), 6378 Context.getBaseElementType(Type), 6379 diag::err_typecheck_decl_incomplete_type)) { 6380 Var->setInvalidDecl(); 6381 return; 6382 } 6383 6384 // The variable can not have an abstract class type. 6385 if (RequireNonAbstractType(Var->getLocation(), Type, 6386 diag::err_abstract_type_in_decl, 6387 AbstractVariableType)) { 6388 Var->setInvalidDecl(); 6389 return; 6390 } 6391 6392 // Check for jumps past the implicit initializer. C++0x 6393 // clarifies that this applies to a "variable with automatic 6394 // storage duration", not a "local variable". 6395 // C++11 [stmt.dcl]p3 6396 // A program that jumps from a point where a variable with automatic 6397 // storage duration is not in scope to a point where it is in scope is 6398 // ill-formed unless the variable has scalar type, class type with a 6399 // trivial default constructor and a trivial destructor, a cv-qualified 6400 // version of one of these types, or an array of one of the preceding 6401 // types and is declared without an initializer. 6402 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6403 if (const RecordType *Record 6404 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6405 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6406 // Mark the function for further checking even if the looser rules of 6407 // C++11 do not require such checks, so that we can diagnose 6408 // incompatibilities with C++98. 6409 if (!CXXRecord->isPOD()) 6410 getCurFunction()->setHasBranchProtectedScope(); 6411 } 6412 } 6413 6414 // C++03 [dcl.init]p9: 6415 // If no initializer is specified for an object, and the 6416 // object is of (possibly cv-qualified) non-POD class type (or 6417 // array thereof), the object shall be default-initialized; if 6418 // the object is of const-qualified type, the underlying class 6419 // type shall have a user-declared default 6420 // constructor. Otherwise, if no initializer is specified for 6421 // a non- static object, the object and its subobjects, if 6422 // any, have an indeterminate initial value); if the object 6423 // or any of its subobjects are of const-qualified type, the 6424 // program is ill-formed. 6425 // C++0x [dcl.init]p11: 6426 // If no initializer is specified for an object, the object is 6427 // default-initialized; [...]. 6428 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6429 InitializationKind Kind 6430 = InitializationKind::CreateDefault(Var->getLocation()); 6431 6432 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6433 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6434 MultiExprArg(*this, 0, 0)); 6435 if (Init.isInvalid()) 6436 Var->setInvalidDecl(); 6437 else if (Init.get()) 6438 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6439 6440 CheckCompleteVariableDeclaration(Var); 6441 } 6442} 6443 6444void Sema::ActOnCXXForRangeDecl(Decl *D) { 6445 VarDecl *VD = dyn_cast<VarDecl>(D); 6446 if (!VD) { 6447 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6448 D->setInvalidDecl(); 6449 return; 6450 } 6451 6452 VD->setCXXForRangeDecl(true); 6453 6454 // for-range-declaration cannot be given a storage class specifier. 6455 int Error = -1; 6456 switch (VD->getStorageClassAsWritten()) { 6457 case SC_None: 6458 break; 6459 case SC_Extern: 6460 Error = 0; 6461 break; 6462 case SC_Static: 6463 Error = 1; 6464 break; 6465 case SC_PrivateExtern: 6466 Error = 2; 6467 break; 6468 case SC_Auto: 6469 Error = 3; 6470 break; 6471 case SC_Register: 6472 Error = 4; 6473 break; 6474 case SC_OpenCLWorkGroupLocal: 6475 llvm_unreachable("Unexpected storage class"); 6476 } 6477 if (VD->isConstexpr()) 6478 Error = 5; 6479 if (Error != -1) { 6480 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6481 << VD->getDeclName() << Error; 6482 D->setInvalidDecl(); 6483 } 6484} 6485 6486void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6487 if (var->isInvalidDecl()) return; 6488 6489 // In ARC, don't allow jumps past the implicit initialization of a 6490 // local retaining variable. 6491 if (getLangOptions().ObjCAutoRefCount && 6492 var->hasLocalStorage()) { 6493 switch (var->getType().getObjCLifetime()) { 6494 case Qualifiers::OCL_None: 6495 case Qualifiers::OCL_ExplicitNone: 6496 case Qualifiers::OCL_Autoreleasing: 6497 break; 6498 6499 case Qualifiers::OCL_Weak: 6500 case Qualifiers::OCL_Strong: 6501 getCurFunction()->setHasBranchProtectedScope(); 6502 break; 6503 } 6504 } 6505 6506 // All the following checks are C++ only. 6507 if (!getLangOptions().CPlusPlus) return; 6508 6509 QualType baseType = Context.getBaseElementType(var->getType()); 6510 if (baseType->isDependentType()) return; 6511 6512 // __block variables might require us to capture a copy-initializer. 6513 if (var->hasAttr<BlocksAttr>()) { 6514 // It's currently invalid to ever have a __block variable with an 6515 // array type; should we diagnose that here? 6516 6517 // Regardless, we don't want to ignore array nesting when 6518 // constructing this copy. 6519 QualType type = var->getType(); 6520 6521 if (type->isStructureOrClassType()) { 6522 SourceLocation poi = var->getLocation(); 6523 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6524 ExprResult result = 6525 PerformCopyInitialization( 6526 InitializedEntity::InitializeBlock(poi, type, false), 6527 poi, Owned(varRef)); 6528 if (!result.isInvalid()) { 6529 result = MaybeCreateExprWithCleanups(result); 6530 Expr *init = result.takeAs<Expr>(); 6531 Context.setBlockVarCopyInits(var, init); 6532 } 6533 } 6534 } 6535 6536 // Check for global constructors. 6537 if (!var->getDeclContext()->isDependentContext() && 6538 var->hasGlobalStorage() && 6539 !var->isStaticLocal() && 6540 var->getInit() && 6541 !var->getInit()->isConstantInitializer(Context, 6542 baseType->isReferenceType())) 6543 Diag(var->getLocation(), diag::warn_global_constructor) 6544 << var->getInit()->getSourceRange(); 6545 6546 // Require the destructor. 6547 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6548 FinalizeVarWithDestructor(var, recordType); 6549} 6550 6551/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6552/// any semantic actions necessary after any initializer has been attached. 6553void 6554Sema::FinalizeDeclaration(Decl *ThisDecl) { 6555 // Note that we are no longer parsing the initializer for this declaration. 6556 ParsingInitForAutoVars.erase(ThisDecl); 6557} 6558 6559Sema::DeclGroupPtrTy 6560Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6561 Decl **Group, unsigned NumDecls) { 6562 SmallVector<Decl*, 8> Decls; 6563 6564 if (DS.isTypeSpecOwned()) 6565 Decls.push_back(DS.getRepAsDecl()); 6566 6567 for (unsigned i = 0; i != NumDecls; ++i) 6568 if (Decl *D = Group[i]) 6569 Decls.push_back(D); 6570 6571 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6572 DS.getTypeSpecType() == DeclSpec::TST_auto); 6573} 6574 6575/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6576/// group, performing any necessary semantic checking. 6577Sema::DeclGroupPtrTy 6578Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6579 bool TypeMayContainAuto) { 6580 // C++0x [dcl.spec.auto]p7: 6581 // If the type deduced for the template parameter U is not the same in each 6582 // deduction, the program is ill-formed. 6583 // FIXME: When initializer-list support is added, a distinction is needed 6584 // between the deduced type U and the deduced type which 'auto' stands for. 6585 // auto a = 0, b = { 1, 2, 3 }; 6586 // is legal because the deduced type U is 'int' in both cases. 6587 if (TypeMayContainAuto && NumDecls > 1) { 6588 QualType Deduced; 6589 CanQualType DeducedCanon; 6590 VarDecl *DeducedDecl = 0; 6591 for (unsigned i = 0; i != NumDecls; ++i) { 6592 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6593 AutoType *AT = D->getType()->getContainedAutoType(); 6594 // Don't reissue diagnostics when instantiating a template. 6595 if (AT && D->isInvalidDecl()) 6596 break; 6597 if (AT && AT->isDeduced()) { 6598 QualType U = AT->getDeducedType(); 6599 CanQualType UCanon = Context.getCanonicalType(U); 6600 if (Deduced.isNull()) { 6601 Deduced = U; 6602 DeducedCanon = UCanon; 6603 DeducedDecl = D; 6604 } else if (DeducedCanon != UCanon) { 6605 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6606 diag::err_auto_different_deductions) 6607 << Deduced << DeducedDecl->getDeclName() 6608 << U << D->getDeclName() 6609 << DeducedDecl->getInit()->getSourceRange() 6610 << D->getInit()->getSourceRange(); 6611 D->setInvalidDecl(); 6612 break; 6613 } 6614 } 6615 } 6616 } 6617 } 6618 6619 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6620} 6621 6622 6623/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6624/// to introduce parameters into function prototype scope. 6625Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6626 const DeclSpec &DS = D.getDeclSpec(); 6627 6628 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6629 // C++03 [dcl.stc]p2 also permits 'auto'. 6630 VarDecl::StorageClass StorageClass = SC_None; 6631 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6632 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6633 StorageClass = SC_Register; 6634 StorageClassAsWritten = SC_Register; 6635 } else if (getLangOptions().CPlusPlus && 6636 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6637 StorageClass = SC_Auto; 6638 StorageClassAsWritten = SC_Auto; 6639 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6640 Diag(DS.getStorageClassSpecLoc(), 6641 diag::err_invalid_storage_class_in_func_decl); 6642 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6643 } 6644 6645 if (D.getDeclSpec().isThreadSpecified()) 6646 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6647 if (D.getDeclSpec().isConstexprSpecified()) 6648 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6649 << 0; 6650 6651 DiagnoseFunctionSpecifiers(D); 6652 6653 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6654 QualType parmDeclType = TInfo->getType(); 6655 6656 if (getLangOptions().CPlusPlus) { 6657 // Check that there are no default arguments inside the type of this 6658 // parameter. 6659 CheckExtraCXXDefaultArguments(D); 6660 6661 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6662 if (D.getCXXScopeSpec().isSet()) { 6663 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6664 << D.getCXXScopeSpec().getRange(); 6665 D.getCXXScopeSpec().clear(); 6666 } 6667 } 6668 6669 // Ensure we have a valid name 6670 IdentifierInfo *II = 0; 6671 if (D.hasName()) { 6672 II = D.getIdentifier(); 6673 if (!II) { 6674 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6675 << GetNameForDeclarator(D).getName().getAsString(); 6676 D.setInvalidType(true); 6677 } 6678 } 6679 6680 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6681 if (II) { 6682 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6683 ForRedeclaration); 6684 LookupName(R, S); 6685 if (R.isSingleResult()) { 6686 NamedDecl *PrevDecl = R.getFoundDecl(); 6687 if (PrevDecl->isTemplateParameter()) { 6688 // Maybe we will complain about the shadowed template parameter. 6689 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6690 // Just pretend that we didn't see the previous declaration. 6691 PrevDecl = 0; 6692 } else if (S->isDeclScope(PrevDecl)) { 6693 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6694 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6695 6696 // Recover by removing the name 6697 II = 0; 6698 D.SetIdentifier(0, D.getIdentifierLoc()); 6699 D.setInvalidType(true); 6700 } 6701 } 6702 } 6703 6704 // Temporarily put parameter variables in the translation unit, not 6705 // the enclosing context. This prevents them from accidentally 6706 // looking like class members in C++. 6707 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6708 D.getSourceRange().getBegin(), 6709 D.getIdentifierLoc(), II, 6710 parmDeclType, TInfo, 6711 StorageClass, StorageClassAsWritten); 6712 6713 if (D.isInvalidType()) 6714 New->setInvalidDecl(); 6715 6716 assert(S->isFunctionPrototypeScope()); 6717 assert(S->getFunctionPrototypeDepth() >= 1); 6718 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6719 S->getNextFunctionPrototypeIndex()); 6720 6721 // Add the parameter declaration into this scope. 6722 S->AddDecl(New); 6723 if (II) 6724 IdResolver.AddDecl(New); 6725 6726 ProcessDeclAttributes(S, New, D); 6727 6728 if (D.getDeclSpec().isModulePrivateSpecified()) 6729 Diag(New->getLocation(), diag::err_module_private_local) 6730 << 1 << New->getDeclName() 6731 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6732 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6733 6734 if (New->hasAttr<BlocksAttr>()) { 6735 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6736 } 6737 return New; 6738} 6739 6740/// \brief Synthesizes a variable for a parameter arising from a 6741/// typedef. 6742ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6743 SourceLocation Loc, 6744 QualType T) { 6745 /* FIXME: setting StartLoc == Loc. 6746 Would it be worth to modify callers so as to provide proper source 6747 location for the unnamed parameters, embedding the parameter's type? */ 6748 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6749 T, Context.getTrivialTypeSourceInfo(T, Loc), 6750 SC_None, SC_None, 0); 6751 Param->setImplicit(); 6752 return Param; 6753} 6754 6755void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6756 ParmVarDecl * const *ParamEnd) { 6757 // Don't diagnose unused-parameter errors in template instantiations; we 6758 // will already have done so in the template itself. 6759 if (!ActiveTemplateInstantiations.empty()) 6760 return; 6761 6762 for (; Param != ParamEnd; ++Param) { 6763 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6764 !(*Param)->hasAttr<UnusedAttr>()) { 6765 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6766 << (*Param)->getDeclName(); 6767 } 6768 } 6769} 6770 6771void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6772 ParmVarDecl * const *ParamEnd, 6773 QualType ReturnTy, 6774 NamedDecl *D) { 6775 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6776 return; 6777 6778 // Warn if the return value is pass-by-value and larger than the specified 6779 // threshold. 6780 if (ReturnTy.isPODType(Context)) { 6781 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6782 if (Size > LangOpts.NumLargeByValueCopy) 6783 Diag(D->getLocation(), diag::warn_return_value_size) 6784 << D->getDeclName() << Size; 6785 } 6786 6787 // Warn if any parameter is pass-by-value and larger than the specified 6788 // threshold. 6789 for (; Param != ParamEnd; ++Param) { 6790 QualType T = (*Param)->getType(); 6791 if (!T.isPODType(Context)) 6792 continue; 6793 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6794 if (Size > LangOpts.NumLargeByValueCopy) 6795 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6796 << (*Param)->getDeclName() << Size; 6797 } 6798} 6799 6800ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6801 SourceLocation NameLoc, IdentifierInfo *Name, 6802 QualType T, TypeSourceInfo *TSInfo, 6803 VarDecl::StorageClass StorageClass, 6804 VarDecl::StorageClass StorageClassAsWritten) { 6805 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6806 if (getLangOptions().ObjCAutoRefCount && 6807 T.getObjCLifetime() == Qualifiers::OCL_None && 6808 T->isObjCLifetimeType()) { 6809 6810 Qualifiers::ObjCLifetime lifetime; 6811 6812 // Special cases for arrays: 6813 // - if it's const, use __unsafe_unretained 6814 // - otherwise, it's an error 6815 if (T->isArrayType()) { 6816 if (!T.isConstQualified()) { 6817 DelayedDiagnostics.add( 6818 sema::DelayedDiagnostic::makeForbiddenType( 6819 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6820 } 6821 lifetime = Qualifiers::OCL_ExplicitNone; 6822 } else { 6823 lifetime = T->getObjCARCImplicitLifetime(); 6824 } 6825 T = Context.getLifetimeQualifiedType(T, lifetime); 6826 } 6827 6828 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6829 Context.getAdjustedParameterType(T), 6830 TSInfo, 6831 StorageClass, StorageClassAsWritten, 6832 0); 6833 6834 // Parameters can not be abstract class types. 6835 // For record types, this is done by the AbstractClassUsageDiagnoser once 6836 // the class has been completely parsed. 6837 if (!CurContext->isRecord() && 6838 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6839 AbstractParamType)) 6840 New->setInvalidDecl(); 6841 6842 // Parameter declarators cannot be interface types. All ObjC objects are 6843 // passed by reference. 6844 if (T->isObjCObjectType()) { 6845 Diag(NameLoc, 6846 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6847 << FixItHint::CreateInsertion(NameLoc, "*"); 6848 T = Context.getObjCObjectPointerType(T); 6849 New->setType(T); 6850 } 6851 6852 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6853 // duration shall not be qualified by an address-space qualifier." 6854 // Since all parameters have automatic store duration, they can not have 6855 // an address space. 6856 if (T.getAddressSpace() != 0) { 6857 Diag(NameLoc, diag::err_arg_with_address_space); 6858 New->setInvalidDecl(); 6859 } 6860 6861 return New; 6862} 6863 6864void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6865 SourceLocation LocAfterDecls) { 6866 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6867 6868 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6869 // for a K&R function. 6870 if (!FTI.hasPrototype) { 6871 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6872 --i; 6873 if (FTI.ArgInfo[i].Param == 0) { 6874 llvm::SmallString<256> Code; 6875 llvm::raw_svector_ostream(Code) << " int " 6876 << FTI.ArgInfo[i].Ident->getName() 6877 << ";\n"; 6878 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6879 << FTI.ArgInfo[i].Ident 6880 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6881 6882 // Implicitly declare the argument as type 'int' for lack of a better 6883 // type. 6884 AttributeFactory attrs; 6885 DeclSpec DS(attrs); 6886 const char* PrevSpec; // unused 6887 unsigned DiagID; // unused 6888 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6889 PrevSpec, DiagID); 6890 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6891 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6892 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6893 } 6894 } 6895 } 6896} 6897 6898Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6899 Declarator &D) { 6900 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6901 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6902 Scope *ParentScope = FnBodyScope->getParent(); 6903 6904 D.setFunctionDefinitionKind(FDK_Definition); 6905 Decl *DP = HandleDeclarator(ParentScope, D, 6906 MultiTemplateParamsArg(*this)); 6907 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6908} 6909 6910static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6911 // Don't warn about invalid declarations. 6912 if (FD->isInvalidDecl()) 6913 return false; 6914 6915 // Or declarations that aren't global. 6916 if (!FD->isGlobal()) 6917 return false; 6918 6919 // Don't warn about C++ member functions. 6920 if (isa<CXXMethodDecl>(FD)) 6921 return false; 6922 6923 // Don't warn about 'main'. 6924 if (FD->isMain()) 6925 return false; 6926 6927 // Don't warn about inline functions. 6928 if (FD->isInlined()) 6929 return false; 6930 6931 // Don't warn about function templates. 6932 if (FD->getDescribedFunctionTemplate()) 6933 return false; 6934 6935 // Don't warn about function template specializations. 6936 if (FD->isFunctionTemplateSpecialization()) 6937 return false; 6938 6939 bool MissingPrototype = true; 6940 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6941 Prev; Prev = Prev->getPreviousDeclaration()) { 6942 // Ignore any declarations that occur in function or method 6943 // scope, because they aren't visible from the header. 6944 if (Prev->getDeclContext()->isFunctionOrMethod()) 6945 continue; 6946 6947 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6948 break; 6949 } 6950 6951 return MissingPrototype; 6952} 6953 6954void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6955 // Don't complain if we're in GNU89 mode and the previous definition 6956 // was an extern inline function. 6957 const FunctionDecl *Definition; 6958 if (FD->isDefined(Definition) && 6959 !canRedefineFunction(Definition, getLangOptions())) { 6960 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6961 Definition->getStorageClass() == SC_Extern) 6962 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6963 << FD->getDeclName() << getLangOptions().CPlusPlus; 6964 else 6965 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6966 Diag(Definition->getLocation(), diag::note_previous_definition); 6967 } 6968} 6969 6970Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6971 // Clear the last template instantiation error context. 6972 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6973 6974 if (!D) 6975 return D; 6976 FunctionDecl *FD = 0; 6977 6978 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6979 FD = FunTmpl->getTemplatedDecl(); 6980 else 6981 FD = cast<FunctionDecl>(D); 6982 6983 // Enter a new function scope 6984 PushFunctionScope(); 6985 6986 // See if this is a redefinition. 6987 if (!FD->isLateTemplateParsed()) 6988 CheckForFunctionRedefinition(FD); 6989 6990 // Builtin functions cannot be defined. 6991 if (unsigned BuiltinID = FD->getBuiltinID()) { 6992 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6993 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6994 FD->setInvalidDecl(); 6995 } 6996 } 6997 6998 // The return type of a function definition must be complete 6999 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7000 QualType ResultType = FD->getResultType(); 7001 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7002 !FD->isInvalidDecl() && 7003 RequireCompleteType(FD->getLocation(), ResultType, 7004 diag::err_func_def_incomplete_result)) 7005 FD->setInvalidDecl(); 7006 7007 // GNU warning -Wmissing-prototypes: 7008 // Warn if a global function is defined without a previous 7009 // prototype declaration. This warning is issued even if the 7010 // definition itself provides a prototype. The aim is to detect 7011 // global functions that fail to be declared in header files. 7012 if (ShouldWarnAboutMissingPrototype(FD)) 7013 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7014 7015 if (FnBodyScope) 7016 PushDeclContext(FnBodyScope, FD); 7017 7018 // Check the validity of our function parameters 7019 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7020 /*CheckParameterNames=*/true); 7021 7022 // Introduce our parameters into the function scope 7023 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7024 ParmVarDecl *Param = FD->getParamDecl(p); 7025 Param->setOwningFunction(FD); 7026 7027 // If this has an identifier, add it to the scope stack. 7028 if (Param->getIdentifier() && FnBodyScope) { 7029 CheckShadow(FnBodyScope, Param); 7030 7031 PushOnScopeChains(Param, FnBodyScope); 7032 } 7033 } 7034 7035 // Checking attributes of current function definition 7036 // dllimport attribute. 7037 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7038 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7039 // dllimport attribute cannot be directly applied to definition. 7040 // Microsoft accepts dllimport for functions defined within class scope. 7041 if (!DA->isInherited() && 7042 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7043 Diag(FD->getLocation(), 7044 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7045 << "dllimport"; 7046 FD->setInvalidDecl(); 7047 return FD; 7048 } 7049 7050 // Visual C++ appears to not think this is an issue, so only issue 7051 // a warning when Microsoft extensions are disabled. 7052 if (!LangOpts.MicrosoftExt) { 7053 // If a symbol previously declared dllimport is later defined, the 7054 // attribute is ignored in subsequent references, and a warning is 7055 // emitted. 7056 Diag(FD->getLocation(), 7057 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7058 << FD->getName() << "dllimport"; 7059 } 7060 } 7061 return FD; 7062} 7063 7064/// \brief Given the set of return statements within a function body, 7065/// compute the variables that are subject to the named return value 7066/// optimization. 7067/// 7068/// Each of the variables that is subject to the named return value 7069/// optimization will be marked as NRVO variables in the AST, and any 7070/// return statement that has a marked NRVO variable as its NRVO candidate can 7071/// use the named return value optimization. 7072/// 7073/// This function applies a very simplistic algorithm for NRVO: if every return 7074/// statement in the function has the same NRVO candidate, that candidate is 7075/// the NRVO variable. 7076/// 7077/// FIXME: Employ a smarter algorithm that accounts for multiple return 7078/// statements and the lifetimes of the NRVO candidates. We should be able to 7079/// find a maximal set of NRVO variables. 7080void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7081 ReturnStmt **Returns = Scope->Returns.data(); 7082 7083 const VarDecl *NRVOCandidate = 0; 7084 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7085 if (!Returns[I]->getNRVOCandidate()) 7086 return; 7087 7088 if (!NRVOCandidate) 7089 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7090 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7091 return; 7092 } 7093 7094 if (NRVOCandidate) 7095 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7096} 7097 7098Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7099 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7100} 7101 7102Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7103 bool IsInstantiation) { 7104 FunctionDecl *FD = 0; 7105 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7106 if (FunTmpl) 7107 FD = FunTmpl->getTemplatedDecl(); 7108 else 7109 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7110 7111 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7112 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7113 7114 if (FD) { 7115 FD->setBody(Body); 7116 if (FD->isMain()) { 7117 // C and C++ allow for main to automagically return 0. 7118 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7119 FD->setHasImplicitReturnZero(true); 7120 WP.disableCheckFallThrough(); 7121 } else if (FD->hasAttr<NakedAttr>()) { 7122 // If the function is marked 'naked', don't complain about missing return 7123 // statements. 7124 WP.disableCheckFallThrough(); 7125 } 7126 7127 // MSVC permits the use of pure specifier (=0) on function definition, 7128 // defined at class scope, warn about this non standard construct. 7129 if (getLangOptions().MicrosoftExt && FD->isPure()) 7130 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7131 7132 if (!FD->isInvalidDecl()) { 7133 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7134 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7135 FD->getResultType(), FD); 7136 7137 // If this is a constructor, we need a vtable. 7138 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7139 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7140 7141 computeNRVO(Body, getCurFunction()); 7142 } 7143 7144 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7145 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7146 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7147 MD->setBody(Body); 7148 if (Body) 7149 MD->setEndLoc(Body->getLocEnd()); 7150 if (!MD->isInvalidDecl()) { 7151 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7152 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7153 MD->getResultType(), MD); 7154 7155 if (Body) 7156 computeNRVO(Body, getCurFunction()); 7157 } 7158 if (ObjCShouldCallSuperDealloc) { 7159 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7160 ObjCShouldCallSuperDealloc = false; 7161 } 7162 if (ObjCShouldCallSuperFinalize) { 7163 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7164 ObjCShouldCallSuperFinalize = false; 7165 } 7166 } else { 7167 return 0; 7168 } 7169 7170 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7171 "ObjC methods, which should have been handled in the block above."); 7172 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7173 "ObjC methods, which should have been handled in the block above."); 7174 7175 // Verify and clean out per-function state. 7176 if (Body) { 7177 // C++ constructors that have function-try-blocks can't have return 7178 // statements in the handlers of that block. (C++ [except.handle]p14) 7179 // Verify this. 7180 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7181 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7182 7183 // Verify that gotos and switch cases don't jump into scopes illegally. 7184 if (getCurFunction()->NeedsScopeChecking() && 7185 !dcl->isInvalidDecl() && 7186 !hasAnyUnrecoverableErrorsInThisFunction()) 7187 DiagnoseInvalidJumps(Body); 7188 7189 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7190 if (!Destructor->getParent()->isDependentType()) 7191 CheckDestructor(Destructor); 7192 7193 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7194 Destructor->getParent()); 7195 } 7196 7197 // If any errors have occurred, clear out any temporaries that may have 7198 // been leftover. This ensures that these temporaries won't be picked up for 7199 // deletion in some later function. 7200 if (PP.getDiagnostics().hasErrorOccurred() || 7201 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7202 ExprTemporaries.clear(); 7203 ExprNeedsCleanups = false; 7204 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7205 // Since the body is valid, issue any analysis-based warnings that are 7206 // enabled. 7207 ActivePolicy = &WP; 7208 } 7209 7210 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7211 !CheckConstexprFunctionBody(FD, Body)) 7212 FD->setInvalidDecl(); 7213 7214 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7215 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7216 } 7217 7218 if (!IsInstantiation) 7219 PopDeclContext(); 7220 7221 PopFunctionOrBlockScope(ActivePolicy, dcl); 7222 7223 // If any errors have occurred, clear out any temporaries that may have 7224 // been leftover. This ensures that these temporaries won't be picked up for 7225 // deletion in some later function. 7226 if (getDiagnostics().hasErrorOccurred()) { 7227 ExprTemporaries.clear(); 7228 ExprNeedsCleanups = false; 7229 } 7230 7231 return dcl; 7232} 7233 7234 7235/// When we finish delayed parsing of an attribute, we must attach it to the 7236/// relevant Decl. 7237void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7238 ParsedAttributes &Attrs) { 7239 ProcessDeclAttributeList(S, D, Attrs.getList()); 7240} 7241 7242 7243/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7244/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7245NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7246 IdentifierInfo &II, Scope *S) { 7247 // Before we produce a declaration for an implicitly defined 7248 // function, see whether there was a locally-scoped declaration of 7249 // this name as a function or variable. If so, use that 7250 // (non-visible) declaration, and complain about it. 7251 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7252 = findLocallyScopedExternalDecl(&II); 7253 if (Pos != LocallyScopedExternalDecls.end()) { 7254 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7255 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7256 return Pos->second; 7257 } 7258 7259 // Extension in C99. Legal in C90, but warn about it. 7260 if (II.getName().startswith("__builtin_")) 7261 Diag(Loc, diag::warn_builtin_unknown) << &II; 7262 else if (getLangOptions().C99) 7263 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7264 else 7265 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7266 7267 // Set a Declarator for the implicit definition: int foo(); 7268 const char *Dummy; 7269 AttributeFactory attrFactory; 7270 DeclSpec DS(attrFactory); 7271 unsigned DiagID; 7272 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7273 (void)Error; // Silence warning. 7274 assert(!Error && "Error setting up implicit decl!"); 7275 Declarator D(DS, Declarator::BlockContext); 7276 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7277 0, 0, true, SourceLocation(), 7278 SourceLocation(), SourceLocation(), 7279 SourceLocation(), 7280 EST_None, SourceLocation(), 7281 0, 0, 0, 0, Loc, Loc, D), 7282 DS.getAttributes(), 7283 SourceLocation()); 7284 D.SetIdentifier(&II, Loc); 7285 7286 // Insert this function into translation-unit scope. 7287 7288 DeclContext *PrevDC = CurContext; 7289 CurContext = Context.getTranslationUnitDecl(); 7290 7291 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7292 FD->setImplicit(); 7293 7294 CurContext = PrevDC; 7295 7296 AddKnownFunctionAttributes(FD); 7297 7298 return FD; 7299} 7300 7301/// \brief Adds any function attributes that we know a priori based on 7302/// the declaration of this function. 7303/// 7304/// These attributes can apply both to implicitly-declared builtins 7305/// (like __builtin___printf_chk) or to library-declared functions 7306/// like NSLog or printf. 7307/// 7308/// We need to check for duplicate attributes both here and where user-written 7309/// attributes are applied to declarations. 7310void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7311 if (FD->isInvalidDecl()) 7312 return; 7313 7314 // If this is a built-in function, map its builtin attributes to 7315 // actual attributes. 7316 if (unsigned BuiltinID = FD->getBuiltinID()) { 7317 // Handle printf-formatting attributes. 7318 unsigned FormatIdx; 7319 bool HasVAListArg; 7320 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7321 if (!FD->getAttr<FormatAttr>()) 7322 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7323 "printf", FormatIdx+1, 7324 HasVAListArg ? 0 : FormatIdx+2)); 7325 } 7326 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7327 HasVAListArg)) { 7328 if (!FD->getAttr<FormatAttr>()) 7329 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7330 "scanf", FormatIdx+1, 7331 HasVAListArg ? 0 : FormatIdx+2)); 7332 } 7333 7334 // Mark const if we don't care about errno and that is the only 7335 // thing preventing the function from being const. This allows 7336 // IRgen to use LLVM intrinsics for such functions. 7337 if (!getLangOptions().MathErrno && 7338 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7339 if (!FD->getAttr<ConstAttr>()) 7340 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7341 } 7342 7343 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7344 !FD->getAttr<ReturnsTwiceAttr>()) 7345 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7346 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7347 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7348 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7349 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7350 } 7351 7352 IdentifierInfo *Name = FD->getIdentifier(); 7353 if (!Name) 7354 return; 7355 if ((!getLangOptions().CPlusPlus && 7356 FD->getDeclContext()->isTranslationUnit()) || 7357 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7358 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7359 LinkageSpecDecl::lang_c)) { 7360 // Okay: this could be a libc/libm/Objective-C function we know 7361 // about. 7362 } else 7363 return; 7364 7365 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7366 // FIXME: NSLog and NSLogv should be target specific 7367 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7368 // FIXME: We known better than our headers. 7369 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7370 } else 7371 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7372 "printf", 1, 7373 Name->isStr("NSLogv") ? 0 : 2)); 7374 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7375 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7376 // target-specific builtins, perhaps? 7377 if (!FD->getAttr<FormatAttr>()) 7378 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7379 "printf", 2, 7380 Name->isStr("vasprintf") ? 0 : 3)); 7381 } 7382} 7383 7384TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7385 TypeSourceInfo *TInfo) { 7386 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7387 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7388 7389 if (!TInfo) { 7390 assert(D.isInvalidType() && "no declarator info for valid type"); 7391 TInfo = Context.getTrivialTypeSourceInfo(T); 7392 } 7393 7394 // Scope manipulation handled by caller. 7395 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7396 D.getSourceRange().getBegin(), 7397 D.getIdentifierLoc(), 7398 D.getIdentifier(), 7399 TInfo); 7400 7401 // Bail out immediately if we have an invalid declaration. 7402 if (D.isInvalidType()) { 7403 NewTD->setInvalidDecl(); 7404 return NewTD; 7405 } 7406 7407 if (D.getDeclSpec().isModulePrivateSpecified()) { 7408 if (CurContext->isFunctionOrMethod()) 7409 Diag(NewTD->getLocation(), diag::err_module_private_local) 7410 << 2 << NewTD->getDeclName() 7411 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7412 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7413 else 7414 NewTD->setModulePrivate(); 7415 } 7416 7417 // C++ [dcl.typedef]p8: 7418 // If the typedef declaration defines an unnamed class (or 7419 // enum), the first typedef-name declared by the declaration 7420 // to be that class type (or enum type) is used to denote the 7421 // class type (or enum type) for linkage purposes only. 7422 // We need to check whether the type was declared in the declaration. 7423 switch (D.getDeclSpec().getTypeSpecType()) { 7424 case TST_enum: 7425 case TST_struct: 7426 case TST_union: 7427 case TST_class: { 7428 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7429 7430 // Do nothing if the tag is not anonymous or already has an 7431 // associated typedef (from an earlier typedef in this decl group). 7432 if (tagFromDeclSpec->getIdentifier()) break; 7433 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7434 7435 // A well-formed anonymous tag must always be a TUK_Definition. 7436 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7437 7438 // The type must match the tag exactly; no qualifiers allowed. 7439 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7440 break; 7441 7442 // Otherwise, set this is the anon-decl typedef for the tag. 7443 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7444 break; 7445 } 7446 7447 default: 7448 break; 7449 } 7450 7451 return NewTD; 7452} 7453 7454 7455/// \brief Determine whether a tag with a given kind is acceptable 7456/// as a redeclaration of the given tag declaration. 7457/// 7458/// \returns true if the new tag kind is acceptable, false otherwise. 7459bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7460 TagTypeKind NewTag, bool isDefinition, 7461 SourceLocation NewTagLoc, 7462 const IdentifierInfo &Name) { 7463 // C++ [dcl.type.elab]p3: 7464 // The class-key or enum keyword present in the 7465 // elaborated-type-specifier shall agree in kind with the 7466 // declaration to which the name in the elaborated-type-specifier 7467 // refers. This rule also applies to the form of 7468 // elaborated-type-specifier that declares a class-name or 7469 // friend class since it can be construed as referring to the 7470 // definition of the class. Thus, in any 7471 // elaborated-type-specifier, the enum keyword shall be used to 7472 // refer to an enumeration (7.2), the union class-key shall be 7473 // used to refer to a union (clause 9), and either the class or 7474 // struct class-key shall be used to refer to a class (clause 9) 7475 // declared using the class or struct class-key. 7476 TagTypeKind OldTag = Previous->getTagKind(); 7477 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7478 if (OldTag == NewTag) 7479 return true; 7480 7481 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7482 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7483 // Warn about the struct/class tag mismatch. 7484 bool isTemplate = false; 7485 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7486 isTemplate = Record->getDescribedClassTemplate(); 7487 7488 if (!ActiveTemplateInstantiations.empty()) { 7489 // In a template instantiation, do not offer fix-its for tag mismatches 7490 // since they usually mess up the template instead of fixing the problem. 7491 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7492 << (NewTag == TTK_Class) << isTemplate << &Name; 7493 return true; 7494 } 7495 7496 if (isDefinition) { 7497 // On definitions, check previous tags and issue a fix-it for each 7498 // one that doesn't match the current tag. 7499 if (Previous->getDefinition()) { 7500 // Don't suggest fix-its for redefinitions. 7501 return true; 7502 } 7503 7504 bool previousMismatch = false; 7505 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7506 E(Previous->redecls_end()); I != E; ++I) { 7507 if (I->getTagKind() != NewTag) { 7508 if (!previousMismatch) { 7509 previousMismatch = true; 7510 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7511 << (NewTag == TTK_Class) << isTemplate << &Name; 7512 } 7513 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7514 << (NewTag == TTK_Class) 7515 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7516 NewTag == TTK_Class? 7517 "class" : "struct"); 7518 } 7519 } 7520 return true; 7521 } 7522 7523 // Check for a previous definition. If current tag and definition 7524 // are same type, do nothing. If no definition, but disagree with 7525 // with previous tag type, give a warning, but no fix-it. 7526 const TagDecl *Redecl = Previous->getDefinition() ? 7527 Previous->getDefinition() : Previous; 7528 if (Redecl->getTagKind() == NewTag) { 7529 return true; 7530 } 7531 7532 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7533 << (NewTag == TTK_Class) 7534 << isTemplate << &Name; 7535 Diag(Redecl->getLocation(), diag::note_previous_use); 7536 7537 // If there is a previous defintion, suggest a fix-it. 7538 if (Previous->getDefinition()) { 7539 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7540 << (Redecl->getTagKind() == TTK_Class) 7541 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7542 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7543 } 7544 7545 return true; 7546 } 7547 return false; 7548} 7549 7550/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7551/// former case, Name will be non-null. In the later case, Name will be null. 7552/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7553/// reference/declaration/definition of a tag. 7554Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7555 SourceLocation KWLoc, CXXScopeSpec &SS, 7556 IdentifierInfo *Name, SourceLocation NameLoc, 7557 AttributeList *Attr, AccessSpecifier AS, 7558 SourceLocation ModulePrivateLoc, 7559 MultiTemplateParamsArg TemplateParameterLists, 7560 bool &OwnedDecl, bool &IsDependent, 7561 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7562 TypeResult UnderlyingType) { 7563 // If this is not a definition, it must have a name. 7564 assert((Name != 0 || TUK == TUK_Definition) && 7565 "Nameless record must be a definition!"); 7566 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7567 7568 OwnedDecl = false; 7569 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7570 7571 // FIXME: Check explicit specializations more carefully. 7572 bool isExplicitSpecialization = false; 7573 bool Invalid = false; 7574 7575 // We only need to do this matching if we have template parameters 7576 // or a scope specifier, which also conveniently avoids this work 7577 // for non-C++ cases. 7578 if (TemplateParameterLists.size() > 0 || 7579 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7580 if (TemplateParameterList *TemplateParams 7581 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7582 TemplateParameterLists.get(), 7583 TemplateParameterLists.size(), 7584 TUK == TUK_Friend, 7585 isExplicitSpecialization, 7586 Invalid)) { 7587 if (TemplateParams->size() > 0) { 7588 // This is a declaration or definition of a class template (which may 7589 // be a member of another template). 7590 7591 if (Invalid) 7592 return 0; 7593 7594 OwnedDecl = false; 7595 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7596 SS, Name, NameLoc, Attr, 7597 TemplateParams, AS, 7598 ModulePrivateLoc, 7599 TemplateParameterLists.size() - 1, 7600 (TemplateParameterList**) TemplateParameterLists.release()); 7601 return Result.get(); 7602 } else { 7603 // The "template<>" header is extraneous. 7604 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7605 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7606 isExplicitSpecialization = true; 7607 } 7608 } 7609 } 7610 7611 // Figure out the underlying type if this a enum declaration. We need to do 7612 // this early, because it's needed to detect if this is an incompatible 7613 // redeclaration. 7614 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7615 7616 if (Kind == TTK_Enum) { 7617 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7618 // No underlying type explicitly specified, or we failed to parse the 7619 // type, default to int. 7620 EnumUnderlying = Context.IntTy.getTypePtr(); 7621 else if (UnderlyingType.get()) { 7622 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7623 // integral type; any cv-qualification is ignored. 7624 TypeSourceInfo *TI = 0; 7625 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7626 EnumUnderlying = TI; 7627 7628 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7629 7630 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7631 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7632 << T; 7633 // Recover by falling back to int. 7634 EnumUnderlying = Context.IntTy.getTypePtr(); 7635 } 7636 7637 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7638 UPPC_FixedUnderlyingType)) 7639 EnumUnderlying = Context.IntTy.getTypePtr(); 7640 7641 } else if (getLangOptions().MicrosoftExt) 7642 // Microsoft enums are always of int type. 7643 EnumUnderlying = Context.IntTy.getTypePtr(); 7644 } 7645 7646 DeclContext *SearchDC = CurContext; 7647 DeclContext *DC = CurContext; 7648 bool isStdBadAlloc = false; 7649 7650 RedeclarationKind Redecl = ForRedeclaration; 7651 if (TUK == TUK_Friend || TUK == TUK_Reference) 7652 Redecl = NotForRedeclaration; 7653 7654 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7655 7656 if (Name && SS.isNotEmpty()) { 7657 // We have a nested-name tag ('struct foo::bar'). 7658 7659 // Check for invalid 'foo::'. 7660 if (SS.isInvalid()) { 7661 Name = 0; 7662 goto CreateNewDecl; 7663 } 7664 7665 // If this is a friend or a reference to a class in a dependent 7666 // context, don't try to make a decl for it. 7667 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7668 DC = computeDeclContext(SS, false); 7669 if (!DC) { 7670 IsDependent = true; 7671 return 0; 7672 } 7673 } else { 7674 DC = computeDeclContext(SS, true); 7675 if (!DC) { 7676 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7677 << SS.getRange(); 7678 return 0; 7679 } 7680 } 7681 7682 if (RequireCompleteDeclContext(SS, DC)) 7683 return 0; 7684 7685 SearchDC = DC; 7686 // Look-up name inside 'foo::'. 7687 LookupQualifiedName(Previous, DC); 7688 7689 if (Previous.isAmbiguous()) 7690 return 0; 7691 7692 if (Previous.empty()) { 7693 // Name lookup did not find anything. However, if the 7694 // nested-name-specifier refers to the current instantiation, 7695 // and that current instantiation has any dependent base 7696 // classes, we might find something at instantiation time: treat 7697 // this as a dependent elaborated-type-specifier. 7698 // But this only makes any sense for reference-like lookups. 7699 if (Previous.wasNotFoundInCurrentInstantiation() && 7700 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7701 IsDependent = true; 7702 return 0; 7703 } 7704 7705 // A tag 'foo::bar' must already exist. 7706 Diag(NameLoc, diag::err_not_tag_in_scope) 7707 << Kind << Name << DC << SS.getRange(); 7708 Name = 0; 7709 Invalid = true; 7710 goto CreateNewDecl; 7711 } 7712 } else if (Name) { 7713 // If this is a named struct, check to see if there was a previous forward 7714 // declaration or definition. 7715 // FIXME: We're looking into outer scopes here, even when we 7716 // shouldn't be. Doing so can result in ambiguities that we 7717 // shouldn't be diagnosing. 7718 LookupName(Previous, S); 7719 7720 if (Previous.isAmbiguous() && 7721 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7722 LookupResult::Filter F = Previous.makeFilter(); 7723 while (F.hasNext()) { 7724 NamedDecl *ND = F.next(); 7725 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7726 F.erase(); 7727 } 7728 F.done(); 7729 } 7730 7731 // Note: there used to be some attempt at recovery here. 7732 if (Previous.isAmbiguous()) 7733 return 0; 7734 7735 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7736 // FIXME: This makes sure that we ignore the contexts associated 7737 // with C structs, unions, and enums when looking for a matching 7738 // tag declaration or definition. See the similar lookup tweak 7739 // in Sema::LookupName; is there a better way to deal with this? 7740 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7741 SearchDC = SearchDC->getParent(); 7742 } 7743 } else if (S->isFunctionPrototypeScope()) { 7744 // If this is an enum declaration in function prototype scope, set its 7745 // initial context to the translation unit. 7746 SearchDC = Context.getTranslationUnitDecl(); 7747 } 7748 7749 if (Previous.isSingleResult() && 7750 Previous.getFoundDecl()->isTemplateParameter()) { 7751 // Maybe we will complain about the shadowed template parameter. 7752 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7753 // Just pretend that we didn't see the previous declaration. 7754 Previous.clear(); 7755 } 7756 7757 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7758 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7759 // This is a declaration of or a reference to "std::bad_alloc". 7760 isStdBadAlloc = true; 7761 7762 if (Previous.empty() && StdBadAlloc) { 7763 // std::bad_alloc has been implicitly declared (but made invisible to 7764 // name lookup). Fill in this implicit declaration as the previous 7765 // declaration, so that the declarations get chained appropriately. 7766 Previous.addDecl(getStdBadAlloc()); 7767 } 7768 } 7769 7770 // If we didn't find a previous declaration, and this is a reference 7771 // (or friend reference), move to the correct scope. In C++, we 7772 // also need to do a redeclaration lookup there, just in case 7773 // there's a shadow friend decl. 7774 if (Name && Previous.empty() && 7775 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7776 if (Invalid) goto CreateNewDecl; 7777 assert(SS.isEmpty()); 7778 7779 if (TUK == TUK_Reference) { 7780 // C++ [basic.scope.pdecl]p5: 7781 // -- for an elaborated-type-specifier of the form 7782 // 7783 // class-key identifier 7784 // 7785 // if the elaborated-type-specifier is used in the 7786 // decl-specifier-seq or parameter-declaration-clause of a 7787 // function defined in namespace scope, the identifier is 7788 // declared as a class-name in the namespace that contains 7789 // the declaration; otherwise, except as a friend 7790 // declaration, the identifier is declared in the smallest 7791 // non-class, non-function-prototype scope that contains the 7792 // declaration. 7793 // 7794 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7795 // C structs and unions. 7796 // 7797 // It is an error in C++ to declare (rather than define) an enum 7798 // type, including via an elaborated type specifier. We'll 7799 // diagnose that later; for now, declare the enum in the same 7800 // scope as we would have picked for any other tag type. 7801 // 7802 // GNU C also supports this behavior as part of its incomplete 7803 // enum types extension, while GNU C++ does not. 7804 // 7805 // Find the context where we'll be declaring the tag. 7806 // FIXME: We would like to maintain the current DeclContext as the 7807 // lexical context, 7808 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7809 SearchDC = SearchDC->getParent(); 7810 7811 // Find the scope where we'll be declaring the tag. 7812 while (S->isClassScope() || 7813 (getLangOptions().CPlusPlus && 7814 S->isFunctionPrototypeScope()) || 7815 ((S->getFlags() & Scope::DeclScope) == 0) || 7816 (S->getEntity() && 7817 ((DeclContext *)S->getEntity())->isTransparentContext())) 7818 S = S->getParent(); 7819 } else { 7820 assert(TUK == TUK_Friend); 7821 // C++ [namespace.memdef]p3: 7822 // If a friend declaration in a non-local class first declares a 7823 // class or function, the friend class or function is a member of 7824 // the innermost enclosing namespace. 7825 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7826 } 7827 7828 // In C++, we need to do a redeclaration lookup to properly 7829 // diagnose some problems. 7830 if (getLangOptions().CPlusPlus) { 7831 Previous.setRedeclarationKind(ForRedeclaration); 7832 LookupQualifiedName(Previous, SearchDC); 7833 } 7834 } 7835 7836 if (!Previous.empty()) { 7837 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7838 7839 // It's okay to have a tag decl in the same scope as a typedef 7840 // which hides a tag decl in the same scope. Finding this 7841 // insanity with a redeclaration lookup can only actually happen 7842 // in C++. 7843 // 7844 // This is also okay for elaborated-type-specifiers, which is 7845 // technically forbidden by the current standard but which is 7846 // okay according to the likely resolution of an open issue; 7847 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7848 if (getLangOptions().CPlusPlus) { 7849 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7850 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7851 TagDecl *Tag = TT->getDecl(); 7852 if (Tag->getDeclName() == Name && 7853 Tag->getDeclContext()->getRedeclContext() 7854 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7855 PrevDecl = Tag; 7856 Previous.clear(); 7857 Previous.addDecl(Tag); 7858 Previous.resolveKind(); 7859 } 7860 } 7861 } 7862 } 7863 7864 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7865 // If this is a use of a previous tag, or if the tag is already declared 7866 // in the same scope (so that the definition/declaration completes or 7867 // rementions the tag), reuse the decl. 7868 if (TUK == TUK_Reference || TUK == TUK_Friend || 7869 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7870 // Make sure that this wasn't declared as an enum and now used as a 7871 // struct or something similar. 7872 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7873 TUK == TUK_Definition, KWLoc, 7874 *Name)) { 7875 bool SafeToContinue 7876 = (PrevTagDecl->getTagKind() != TTK_Enum && 7877 Kind != TTK_Enum); 7878 if (SafeToContinue) 7879 Diag(KWLoc, diag::err_use_with_wrong_tag) 7880 << Name 7881 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7882 PrevTagDecl->getKindName()); 7883 else 7884 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7885 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7886 7887 if (SafeToContinue) 7888 Kind = PrevTagDecl->getTagKind(); 7889 else { 7890 // Recover by making this an anonymous redefinition. 7891 Name = 0; 7892 Previous.clear(); 7893 Invalid = true; 7894 } 7895 } 7896 7897 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7898 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7899 7900 // All conflicts with previous declarations are recovered by 7901 // returning the previous declaration. 7902 if (ScopedEnum != PrevEnum->isScoped()) { 7903 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7904 << PrevEnum->isScoped(); 7905 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7906 return PrevTagDecl; 7907 } 7908 else if (EnumUnderlying && PrevEnum->isFixed()) { 7909 QualType T; 7910 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7911 T = TI->getType(); 7912 else 7913 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7914 7915 if (!Context.hasSameUnqualifiedType(T, 7916 PrevEnum->getIntegerType())) { 7917 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7918 diag::err_enum_redeclare_type_mismatch) 7919 << T 7920 << PrevEnum->getIntegerType(); 7921 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7922 return PrevTagDecl; 7923 } 7924 } 7925 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7926 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7927 << PrevEnum->isFixed(); 7928 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7929 return PrevTagDecl; 7930 } 7931 } 7932 7933 if (!Invalid) { 7934 // If this is a use, just return the declaration we found. 7935 7936 // FIXME: In the future, return a variant or some other clue 7937 // for the consumer of this Decl to know it doesn't own it. 7938 // For our current ASTs this shouldn't be a problem, but will 7939 // need to be changed with DeclGroups. 7940 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7941 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7942 return PrevTagDecl; 7943 7944 // Diagnose attempts to redefine a tag. 7945 if (TUK == TUK_Definition) { 7946 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7947 // If we're defining a specialization and the previous definition 7948 // is from an implicit instantiation, don't emit an error 7949 // here; we'll catch this in the general case below. 7950 if (!isExplicitSpecialization || 7951 !isa<CXXRecordDecl>(Def) || 7952 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7953 == TSK_ExplicitSpecialization) { 7954 Diag(NameLoc, diag::err_redefinition) << Name; 7955 Diag(Def->getLocation(), diag::note_previous_definition); 7956 // If this is a redefinition, recover by making this 7957 // struct be anonymous, which will make any later 7958 // references get the previous definition. 7959 Name = 0; 7960 Previous.clear(); 7961 Invalid = true; 7962 } 7963 } else { 7964 // If the type is currently being defined, complain 7965 // about a nested redefinition. 7966 const TagType *Tag 7967 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7968 if (Tag->isBeingDefined()) { 7969 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7970 Diag(PrevTagDecl->getLocation(), 7971 diag::note_previous_definition); 7972 Name = 0; 7973 Previous.clear(); 7974 Invalid = true; 7975 } 7976 } 7977 7978 // Okay, this is definition of a previously declared or referenced 7979 // tag PrevDecl. We're going to create a new Decl for it. 7980 } 7981 } 7982 // If we get here we have (another) forward declaration or we 7983 // have a definition. Just create a new decl. 7984 7985 } else { 7986 // If we get here, this is a definition of a new tag type in a nested 7987 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7988 // new decl/type. We set PrevDecl to NULL so that the entities 7989 // have distinct types. 7990 Previous.clear(); 7991 } 7992 // If we get here, we're going to create a new Decl. If PrevDecl 7993 // is non-NULL, it's a definition of the tag declared by 7994 // PrevDecl. If it's NULL, we have a new definition. 7995 7996 7997 // Otherwise, PrevDecl is not a tag, but was found with tag 7998 // lookup. This is only actually possible in C++, where a few 7999 // things like templates still live in the tag namespace. 8000 } else { 8001 assert(getLangOptions().CPlusPlus); 8002 8003 // Use a better diagnostic if an elaborated-type-specifier 8004 // found the wrong kind of type on the first 8005 // (non-redeclaration) lookup. 8006 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8007 !Previous.isForRedeclaration()) { 8008 unsigned Kind = 0; 8009 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8010 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8011 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8012 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8013 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8014 Invalid = true; 8015 8016 // Otherwise, only diagnose if the declaration is in scope. 8017 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8018 isExplicitSpecialization)) { 8019 // do nothing 8020 8021 // Diagnose implicit declarations introduced by elaborated types. 8022 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8023 unsigned Kind = 0; 8024 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8025 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8026 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8027 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8028 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8029 Invalid = true; 8030 8031 // Otherwise it's a declaration. Call out a particularly common 8032 // case here. 8033 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8034 unsigned Kind = 0; 8035 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8036 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8037 << Name << Kind << TND->getUnderlyingType(); 8038 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8039 Invalid = true; 8040 8041 // Otherwise, diagnose. 8042 } else { 8043 // The tag name clashes with something else in the target scope, 8044 // issue an error and recover by making this tag be anonymous. 8045 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8046 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8047 Name = 0; 8048 Invalid = true; 8049 } 8050 8051 // The existing declaration isn't relevant to us; we're in a 8052 // new scope, so clear out the previous declaration. 8053 Previous.clear(); 8054 } 8055 } 8056 8057CreateNewDecl: 8058 8059 TagDecl *PrevDecl = 0; 8060 if (Previous.isSingleResult()) 8061 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8062 8063 // If there is an identifier, use the location of the identifier as the 8064 // location of the decl, otherwise use the location of the struct/union 8065 // keyword. 8066 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8067 8068 // Otherwise, create a new declaration. If there is a previous 8069 // declaration of the same entity, the two will be linked via 8070 // PrevDecl. 8071 TagDecl *New; 8072 8073 bool IsForwardReference = false; 8074 if (Kind == TTK_Enum) { 8075 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8076 // enum X { A, B, C } D; D should chain to X. 8077 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8078 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8079 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8080 // If this is an undefined enum, warn. 8081 if (TUK != TUK_Definition && !Invalid) { 8082 TagDecl *Def; 8083 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8084 // C++0x: 7.2p2: opaque-enum-declaration. 8085 // Conflicts are diagnosed above. Do nothing. 8086 } 8087 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8088 Diag(Loc, diag::ext_forward_ref_enum_def) 8089 << New; 8090 Diag(Def->getLocation(), diag::note_previous_definition); 8091 } else { 8092 unsigned DiagID = diag::ext_forward_ref_enum; 8093 if (getLangOptions().MicrosoftExt) 8094 DiagID = diag::ext_ms_forward_ref_enum; 8095 else if (getLangOptions().CPlusPlus) 8096 DiagID = diag::err_forward_ref_enum; 8097 Diag(Loc, DiagID); 8098 8099 // If this is a forward-declared reference to an enumeration, make a 8100 // note of it; we won't actually be introducing the declaration into 8101 // the declaration context. 8102 if (TUK == TUK_Reference) 8103 IsForwardReference = true; 8104 } 8105 } 8106 8107 if (EnumUnderlying) { 8108 EnumDecl *ED = cast<EnumDecl>(New); 8109 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8110 ED->setIntegerTypeSourceInfo(TI); 8111 else 8112 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8113 ED->setPromotionType(ED->getIntegerType()); 8114 } 8115 8116 } else { 8117 // struct/union/class 8118 8119 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8120 // struct X { int A; } D; D should chain to X. 8121 if (getLangOptions().CPlusPlus) { 8122 // FIXME: Look for a way to use RecordDecl for simple structs. 8123 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8124 cast_or_null<CXXRecordDecl>(PrevDecl)); 8125 8126 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8127 StdBadAlloc = cast<CXXRecordDecl>(New); 8128 } else 8129 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8130 cast_or_null<RecordDecl>(PrevDecl)); 8131 } 8132 8133 // Maybe add qualifier info. 8134 if (SS.isNotEmpty()) { 8135 if (SS.isSet()) { 8136 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8137 if (TemplateParameterLists.size() > 0) { 8138 New->setTemplateParameterListsInfo(Context, 8139 TemplateParameterLists.size(), 8140 (TemplateParameterList**) TemplateParameterLists.release()); 8141 } 8142 } 8143 else 8144 Invalid = true; 8145 } 8146 8147 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8148 // Add alignment attributes if necessary; these attributes are checked when 8149 // the ASTContext lays out the structure. 8150 // 8151 // It is important for implementing the correct semantics that this 8152 // happen here (in act on tag decl). The #pragma pack stack is 8153 // maintained as a result of parser callbacks which can occur at 8154 // many points during the parsing of a struct declaration (because 8155 // the #pragma tokens are effectively skipped over during the 8156 // parsing of the struct). 8157 AddAlignmentAttributesForRecord(RD); 8158 8159 AddMsStructLayoutForRecord(RD); 8160 } 8161 8162 if (PrevDecl && PrevDecl->isModulePrivate()) 8163 New->setModulePrivate(); 8164 else if (ModulePrivateLoc.isValid()) { 8165 if (isExplicitSpecialization) 8166 Diag(New->getLocation(), diag::err_module_private_specialization) 8167 << 2 8168 << FixItHint::CreateRemoval(ModulePrivateLoc); 8169 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8170 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8171 // __module_private__ does not apply to local classes. However, we only 8172 // diagnose this as an error when the declaration specifiers are 8173 // freestanding. Here, we just ignore the __module_private__. 8174 // foobar 8175 else if (!SearchDC->isFunctionOrMethod()) 8176 New->setModulePrivate(); 8177 } 8178 8179 // If this is a specialization of a member class (of a class template), 8180 // check the specialization. 8181 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8182 Invalid = true; 8183 8184 if (Invalid) 8185 New->setInvalidDecl(); 8186 8187 if (Attr) 8188 ProcessDeclAttributeList(S, New, Attr); 8189 8190 // If we're declaring or defining a tag in function prototype scope 8191 // in C, note that this type can only be used within the function. 8192 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8193 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8194 8195 // Set the lexical context. If the tag has a C++ scope specifier, the 8196 // lexical context will be different from the semantic context. 8197 New->setLexicalDeclContext(CurContext); 8198 8199 // Mark this as a friend decl if applicable. 8200 // In Microsoft mode, a friend declaration also acts as a forward 8201 // declaration so we always pass true to setObjectOfFriendDecl to make 8202 // the tag name visible. 8203 if (TUK == TUK_Friend) 8204 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8205 getLangOptions().MicrosoftExt); 8206 8207 // Set the access specifier. 8208 if (!Invalid && SearchDC->isRecord()) 8209 SetMemberAccessSpecifier(New, PrevDecl, AS); 8210 8211 if (TUK == TUK_Definition) 8212 New->startDefinition(); 8213 8214 // If this has an identifier, add it to the scope stack. 8215 if (TUK == TUK_Friend) { 8216 // We might be replacing an existing declaration in the lookup tables; 8217 // if so, borrow its access specifier. 8218 if (PrevDecl) 8219 New->setAccess(PrevDecl->getAccess()); 8220 8221 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8222 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8223 if (Name) // can be null along some error paths 8224 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8225 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8226 } else if (Name) { 8227 S = getNonFieldDeclScope(S); 8228 PushOnScopeChains(New, S, !IsForwardReference); 8229 if (IsForwardReference) 8230 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8231 8232 } else { 8233 CurContext->addDecl(New); 8234 } 8235 8236 // If this is the C FILE type, notify the AST context. 8237 if (IdentifierInfo *II = New->getIdentifier()) 8238 if (!New->isInvalidDecl() && 8239 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8240 II->isStr("FILE")) 8241 Context.setFILEDecl(New); 8242 8243 OwnedDecl = true; 8244 return New; 8245} 8246 8247void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8248 AdjustDeclIfTemplate(TagD); 8249 TagDecl *Tag = cast<TagDecl>(TagD); 8250 8251 // Enter the tag context. 8252 PushDeclContext(S, Tag); 8253} 8254 8255Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8256 assert(isa<ObjCContainerDecl>(IDecl) && 8257 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8258 DeclContext *OCD = cast<DeclContext>(IDecl); 8259 assert(getContainingDC(OCD) == CurContext && 8260 "The next DeclContext should be lexically contained in the current one."); 8261 CurContext = OCD; 8262 return IDecl; 8263} 8264 8265void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8266 SourceLocation FinalLoc, 8267 SourceLocation LBraceLoc) { 8268 AdjustDeclIfTemplate(TagD); 8269 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8270 8271 FieldCollector->StartClass(); 8272 8273 if (!Record->getIdentifier()) 8274 return; 8275 8276 if (FinalLoc.isValid()) 8277 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8278 8279 // C++ [class]p2: 8280 // [...] The class-name is also inserted into the scope of the 8281 // class itself; this is known as the injected-class-name. For 8282 // purposes of access checking, the injected-class-name is treated 8283 // as if it were a public member name. 8284 CXXRecordDecl *InjectedClassName 8285 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8286 Record->getLocStart(), Record->getLocation(), 8287 Record->getIdentifier(), 8288 /*PrevDecl=*/0, 8289 /*DelayTypeCreation=*/true); 8290 Context.getTypeDeclType(InjectedClassName, Record); 8291 InjectedClassName->setImplicit(); 8292 InjectedClassName->setAccess(AS_public); 8293 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8294 InjectedClassName->setDescribedClassTemplate(Template); 8295 PushOnScopeChains(InjectedClassName, S); 8296 assert(InjectedClassName->isInjectedClassName() && 8297 "Broken injected-class-name"); 8298} 8299 8300void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8301 SourceLocation RBraceLoc) { 8302 AdjustDeclIfTemplate(TagD); 8303 TagDecl *Tag = cast<TagDecl>(TagD); 8304 Tag->setRBraceLoc(RBraceLoc); 8305 8306 if (isa<CXXRecordDecl>(Tag)) 8307 FieldCollector->FinishClass(); 8308 8309 // Exit this scope of this tag's definition. 8310 PopDeclContext(); 8311 8312 // Notify the consumer that we've defined a tag. 8313 Consumer.HandleTagDeclDefinition(Tag); 8314} 8315 8316void Sema::ActOnObjCContainerFinishDefinition() { 8317 // Exit this scope of this interface definition. 8318 PopDeclContext(); 8319} 8320 8321void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8322 assert(DC == CurContext && "Mismatch of container contexts"); 8323 OriginalLexicalContext = DC; 8324 ActOnObjCContainerFinishDefinition(); 8325} 8326 8327void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8328 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8329 OriginalLexicalContext = 0; 8330} 8331 8332void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8333 AdjustDeclIfTemplate(TagD); 8334 TagDecl *Tag = cast<TagDecl>(TagD); 8335 Tag->setInvalidDecl(); 8336 8337 // We're undoing ActOnTagStartDefinition here, not 8338 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8339 // the FieldCollector. 8340 8341 PopDeclContext(); 8342} 8343 8344// Note that FieldName may be null for anonymous bitfields. 8345bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8346 QualType FieldTy, const Expr *BitWidth, 8347 bool *ZeroWidth) { 8348 // Default to true; that shouldn't confuse checks for emptiness 8349 if (ZeroWidth) 8350 *ZeroWidth = true; 8351 8352 // C99 6.7.2.1p4 - verify the field type. 8353 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8354 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8355 // Handle incomplete types with specific error. 8356 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8357 return true; 8358 if (FieldName) 8359 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8360 << FieldName << FieldTy << BitWidth->getSourceRange(); 8361 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8362 << FieldTy << BitWidth->getSourceRange(); 8363 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8364 UPPC_BitFieldWidth)) 8365 return true; 8366 8367 // If the bit-width is type- or value-dependent, don't try to check 8368 // it now. 8369 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8370 return false; 8371 8372 llvm::APSInt Value; 8373 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8374 return true; 8375 8376 if (Value != 0 && ZeroWidth) 8377 *ZeroWidth = false; 8378 8379 // Zero-width bitfield is ok for anonymous field. 8380 if (Value == 0 && FieldName) 8381 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8382 8383 if (Value.isSigned() && Value.isNegative()) { 8384 if (FieldName) 8385 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8386 << FieldName << Value.toString(10); 8387 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8388 << Value.toString(10); 8389 } 8390 8391 if (!FieldTy->isDependentType()) { 8392 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8393 if (Value.getZExtValue() > TypeSize) { 8394 if (!getLangOptions().CPlusPlus) { 8395 if (FieldName) 8396 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8397 << FieldName << (unsigned)Value.getZExtValue() 8398 << (unsigned)TypeSize; 8399 8400 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8401 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8402 } 8403 8404 if (FieldName) 8405 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8406 << FieldName << (unsigned)Value.getZExtValue() 8407 << (unsigned)TypeSize; 8408 else 8409 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8410 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8411 } 8412 } 8413 8414 return false; 8415} 8416 8417/// ActOnField - Each field of a C struct/union is passed into this in order 8418/// to create a FieldDecl object for it. 8419Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8420 Declarator &D, Expr *BitfieldWidth) { 8421 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8422 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8423 /*HasInit=*/false, AS_public); 8424 return Res; 8425} 8426 8427/// HandleField - Analyze a field of a C struct or a C++ data member. 8428/// 8429FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8430 SourceLocation DeclStart, 8431 Declarator &D, Expr *BitWidth, bool HasInit, 8432 AccessSpecifier AS) { 8433 IdentifierInfo *II = D.getIdentifier(); 8434 SourceLocation Loc = DeclStart; 8435 if (II) Loc = D.getIdentifierLoc(); 8436 8437 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8438 QualType T = TInfo->getType(); 8439 if (getLangOptions().CPlusPlus) { 8440 CheckExtraCXXDefaultArguments(D); 8441 8442 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8443 UPPC_DataMemberType)) { 8444 D.setInvalidType(); 8445 T = Context.IntTy; 8446 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8447 } 8448 } 8449 8450 DiagnoseFunctionSpecifiers(D); 8451 8452 if (D.getDeclSpec().isThreadSpecified()) 8453 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8454 if (D.getDeclSpec().isConstexprSpecified()) 8455 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8456 << 2; 8457 8458 // Check to see if this name was declared as a member previously 8459 NamedDecl *PrevDecl = 0; 8460 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8461 LookupName(Previous, S); 8462 switch (Previous.getResultKind()) { 8463 case LookupResult::Found: 8464 case LookupResult::FoundUnresolvedValue: 8465 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8466 break; 8467 8468 case LookupResult::FoundOverloaded: 8469 PrevDecl = Previous.getRepresentativeDecl(); 8470 break; 8471 8472 case LookupResult::NotFound: 8473 case LookupResult::NotFoundInCurrentInstantiation: 8474 case LookupResult::Ambiguous: 8475 break; 8476 } 8477 Previous.suppressDiagnostics(); 8478 8479 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8480 // Maybe we will complain about the shadowed template parameter. 8481 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8482 // Just pretend that we didn't see the previous declaration. 8483 PrevDecl = 0; 8484 } 8485 8486 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8487 PrevDecl = 0; 8488 8489 bool Mutable 8490 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8491 SourceLocation TSSL = D.getSourceRange().getBegin(); 8492 FieldDecl *NewFD 8493 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8494 TSSL, AS, PrevDecl, &D); 8495 8496 if (NewFD->isInvalidDecl()) 8497 Record->setInvalidDecl(); 8498 8499 if (D.getDeclSpec().isModulePrivateSpecified()) 8500 NewFD->setModulePrivate(); 8501 8502 if (NewFD->isInvalidDecl() && PrevDecl) { 8503 // Don't introduce NewFD into scope; there's already something 8504 // with the same name in the same scope. 8505 } else if (II) { 8506 PushOnScopeChains(NewFD, S); 8507 } else 8508 Record->addDecl(NewFD); 8509 8510 return NewFD; 8511} 8512 8513/// \brief Build a new FieldDecl and check its well-formedness. 8514/// 8515/// This routine builds a new FieldDecl given the fields name, type, 8516/// record, etc. \p PrevDecl should refer to any previous declaration 8517/// with the same name and in the same scope as the field to be 8518/// created. 8519/// 8520/// \returns a new FieldDecl. 8521/// 8522/// \todo The Declarator argument is a hack. It will be removed once 8523FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8524 TypeSourceInfo *TInfo, 8525 RecordDecl *Record, SourceLocation Loc, 8526 bool Mutable, Expr *BitWidth, bool HasInit, 8527 SourceLocation TSSL, 8528 AccessSpecifier AS, NamedDecl *PrevDecl, 8529 Declarator *D) { 8530 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8531 bool InvalidDecl = false; 8532 if (D) InvalidDecl = D->isInvalidType(); 8533 8534 // If we receive a broken type, recover by assuming 'int' and 8535 // marking this declaration as invalid. 8536 if (T.isNull()) { 8537 InvalidDecl = true; 8538 T = Context.IntTy; 8539 } 8540 8541 QualType EltTy = Context.getBaseElementType(T); 8542 if (!EltTy->isDependentType() && 8543 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8544 // Fields of incomplete type force their record to be invalid. 8545 Record->setInvalidDecl(); 8546 InvalidDecl = true; 8547 } 8548 8549 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8550 // than a variably modified type. 8551 if (!InvalidDecl && T->isVariablyModifiedType()) { 8552 bool SizeIsNegative; 8553 llvm::APSInt Oversized; 8554 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8555 SizeIsNegative, 8556 Oversized); 8557 if (!FixedTy.isNull()) { 8558 Diag(Loc, diag::warn_illegal_constant_array_size); 8559 T = FixedTy; 8560 } else { 8561 if (SizeIsNegative) 8562 Diag(Loc, diag::err_typecheck_negative_array_size); 8563 else if (Oversized.getBoolValue()) 8564 Diag(Loc, diag::err_array_too_large) 8565 << Oversized.toString(10); 8566 else 8567 Diag(Loc, diag::err_typecheck_field_variable_size); 8568 InvalidDecl = true; 8569 } 8570 } 8571 8572 // Fields can not have abstract class types 8573 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8574 diag::err_abstract_type_in_decl, 8575 AbstractFieldType)) 8576 InvalidDecl = true; 8577 8578 bool ZeroWidth = false; 8579 // If this is declared as a bit-field, check the bit-field. 8580 if (!InvalidDecl && BitWidth && 8581 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8582 InvalidDecl = true; 8583 BitWidth = 0; 8584 ZeroWidth = false; 8585 } 8586 8587 // Check that 'mutable' is consistent with the type of the declaration. 8588 if (!InvalidDecl && Mutable) { 8589 unsigned DiagID = 0; 8590 if (T->isReferenceType()) 8591 DiagID = diag::err_mutable_reference; 8592 else if (T.isConstQualified()) 8593 DiagID = diag::err_mutable_const; 8594 8595 if (DiagID) { 8596 SourceLocation ErrLoc = Loc; 8597 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8598 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8599 Diag(ErrLoc, DiagID); 8600 Mutable = false; 8601 InvalidDecl = true; 8602 } 8603 } 8604 8605 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8606 BitWidth, Mutable, HasInit); 8607 if (InvalidDecl) 8608 NewFD->setInvalidDecl(); 8609 8610 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8611 Diag(Loc, diag::err_duplicate_member) << II; 8612 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8613 NewFD->setInvalidDecl(); 8614 } 8615 8616 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8617 if (Record->isUnion()) { 8618 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8619 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8620 if (RDecl->getDefinition()) { 8621 // C++ [class.union]p1: An object of a class with a non-trivial 8622 // constructor, a non-trivial copy constructor, a non-trivial 8623 // destructor, or a non-trivial copy assignment operator 8624 // cannot be a member of a union, nor can an array of such 8625 // objects. 8626 if (CheckNontrivialField(NewFD)) 8627 NewFD->setInvalidDecl(); 8628 } 8629 } 8630 8631 // C++ [class.union]p1: If a union contains a member of reference type, 8632 // the program is ill-formed. 8633 if (EltTy->isReferenceType()) { 8634 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8635 << NewFD->getDeclName() << EltTy; 8636 NewFD->setInvalidDecl(); 8637 } 8638 } 8639 } 8640 8641 // FIXME: We need to pass in the attributes given an AST 8642 // representation, not a parser representation. 8643 if (D) 8644 // FIXME: What to pass instead of TUScope? 8645 ProcessDeclAttributes(TUScope, NewFD, *D); 8646 8647 // In auto-retain/release, infer strong retension for fields of 8648 // retainable type. 8649 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8650 NewFD->setInvalidDecl(); 8651 8652 if (T.isObjCGCWeak()) 8653 Diag(Loc, diag::warn_attribute_weak_on_field); 8654 8655 NewFD->setAccess(AS); 8656 return NewFD; 8657} 8658 8659bool Sema::CheckNontrivialField(FieldDecl *FD) { 8660 assert(FD); 8661 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8662 8663 if (FD->isInvalidDecl()) 8664 return true; 8665 8666 QualType EltTy = Context.getBaseElementType(FD->getType()); 8667 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8668 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8669 if (RDecl->getDefinition()) { 8670 // We check for copy constructors before constructors 8671 // because otherwise we'll never get complaints about 8672 // copy constructors. 8673 8674 CXXSpecialMember member = CXXInvalid; 8675 if (!RDecl->hasTrivialCopyConstructor()) 8676 member = CXXCopyConstructor; 8677 else if (!RDecl->hasTrivialDefaultConstructor()) 8678 member = CXXDefaultConstructor; 8679 else if (!RDecl->hasTrivialCopyAssignment()) 8680 member = CXXCopyAssignment; 8681 else if (!RDecl->hasTrivialDestructor()) 8682 member = CXXDestructor; 8683 8684 if (member != CXXInvalid) { 8685 if (!getLangOptions().CPlusPlus0x && 8686 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8687 // Objective-C++ ARC: it is an error to have a non-trivial field of 8688 // a union. However, system headers in Objective-C programs 8689 // occasionally have Objective-C lifetime objects within unions, 8690 // and rather than cause the program to fail, we make those 8691 // members unavailable. 8692 SourceLocation Loc = FD->getLocation(); 8693 if (getSourceManager().isInSystemHeader(Loc)) { 8694 if (!FD->hasAttr<UnavailableAttr>()) 8695 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8696 "this system field has retaining ownership")); 8697 return false; 8698 } 8699 } 8700 8701 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8702 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8703 diag::err_illegal_union_or_anon_struct_member) 8704 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8705 DiagnoseNontrivial(RT, member); 8706 return !getLangOptions().CPlusPlus0x; 8707 } 8708 } 8709 } 8710 8711 return false; 8712} 8713 8714/// DiagnoseNontrivial - Given that a class has a non-trivial 8715/// special member, figure out why. 8716void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8717 QualType QT(T, 0U); 8718 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8719 8720 // Check whether the member was user-declared. 8721 switch (member) { 8722 case CXXInvalid: 8723 break; 8724 8725 case CXXDefaultConstructor: 8726 if (RD->hasUserDeclaredConstructor()) { 8727 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8728 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8729 const FunctionDecl *body = 0; 8730 ci->hasBody(body); 8731 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8732 SourceLocation CtorLoc = ci->getLocation(); 8733 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8734 return; 8735 } 8736 } 8737 8738 llvm_unreachable("found no user-declared constructors"); 8739 } 8740 break; 8741 8742 case CXXCopyConstructor: 8743 if (RD->hasUserDeclaredCopyConstructor()) { 8744 SourceLocation CtorLoc = 8745 RD->getCopyConstructor(0)->getLocation(); 8746 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8747 return; 8748 } 8749 break; 8750 8751 case CXXMoveConstructor: 8752 if (RD->hasUserDeclaredMoveConstructor()) { 8753 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8754 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8755 return; 8756 } 8757 break; 8758 8759 case CXXCopyAssignment: 8760 if (RD->hasUserDeclaredCopyAssignment()) { 8761 // FIXME: this should use the location of the copy 8762 // assignment, not the type. 8763 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8764 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8765 return; 8766 } 8767 break; 8768 8769 case CXXMoveAssignment: 8770 if (RD->hasUserDeclaredMoveAssignment()) { 8771 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8772 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8773 return; 8774 } 8775 break; 8776 8777 case CXXDestructor: 8778 if (RD->hasUserDeclaredDestructor()) { 8779 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8780 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8781 return; 8782 } 8783 break; 8784 } 8785 8786 typedef CXXRecordDecl::base_class_iterator base_iter; 8787 8788 // Virtual bases and members inhibit trivial copying/construction, 8789 // but not trivial destruction. 8790 if (member != CXXDestructor) { 8791 // Check for virtual bases. vbases includes indirect virtual bases, 8792 // so we just iterate through the direct bases. 8793 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8794 if (bi->isVirtual()) { 8795 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8796 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8797 return; 8798 } 8799 8800 // Check for virtual methods. 8801 typedef CXXRecordDecl::method_iterator meth_iter; 8802 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8803 ++mi) { 8804 if (mi->isVirtual()) { 8805 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8806 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8807 return; 8808 } 8809 } 8810 } 8811 8812 bool (CXXRecordDecl::*hasTrivial)() const; 8813 switch (member) { 8814 case CXXDefaultConstructor: 8815 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8816 case CXXCopyConstructor: 8817 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8818 case CXXCopyAssignment: 8819 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8820 case CXXDestructor: 8821 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8822 default: 8823 llvm_unreachable("unexpected special member"); 8824 } 8825 8826 // Check for nontrivial bases (and recurse). 8827 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8828 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8829 assert(BaseRT && "Don't know how to handle dependent bases"); 8830 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8831 if (!(BaseRecTy->*hasTrivial)()) { 8832 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8833 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8834 DiagnoseNontrivial(BaseRT, member); 8835 return; 8836 } 8837 } 8838 8839 // Check for nontrivial members (and recurse). 8840 typedef RecordDecl::field_iterator field_iter; 8841 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8842 ++fi) { 8843 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8844 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8845 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8846 8847 if (!(EltRD->*hasTrivial)()) { 8848 SourceLocation FLoc = (*fi)->getLocation(); 8849 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8850 DiagnoseNontrivial(EltRT, member); 8851 return; 8852 } 8853 } 8854 8855 if (EltTy->isObjCLifetimeType()) { 8856 switch (EltTy.getObjCLifetime()) { 8857 case Qualifiers::OCL_None: 8858 case Qualifiers::OCL_ExplicitNone: 8859 break; 8860 8861 case Qualifiers::OCL_Autoreleasing: 8862 case Qualifiers::OCL_Weak: 8863 case Qualifiers::OCL_Strong: 8864 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8865 << QT << EltTy.getObjCLifetime(); 8866 return; 8867 } 8868 } 8869 } 8870 8871 llvm_unreachable("found no explanation for non-trivial member"); 8872} 8873 8874/// TranslateIvarVisibility - Translate visibility from a token ID to an 8875/// AST enum value. 8876static ObjCIvarDecl::AccessControl 8877TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8878 switch (ivarVisibility) { 8879 default: llvm_unreachable("Unknown visitibility kind"); 8880 case tok::objc_private: return ObjCIvarDecl::Private; 8881 case tok::objc_public: return ObjCIvarDecl::Public; 8882 case tok::objc_protected: return ObjCIvarDecl::Protected; 8883 case tok::objc_package: return ObjCIvarDecl::Package; 8884 } 8885} 8886 8887/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8888/// in order to create an IvarDecl object for it. 8889Decl *Sema::ActOnIvar(Scope *S, 8890 SourceLocation DeclStart, 8891 Declarator &D, Expr *BitfieldWidth, 8892 tok::ObjCKeywordKind Visibility) { 8893 8894 IdentifierInfo *II = D.getIdentifier(); 8895 Expr *BitWidth = (Expr*)BitfieldWidth; 8896 SourceLocation Loc = DeclStart; 8897 if (II) Loc = D.getIdentifierLoc(); 8898 8899 // FIXME: Unnamed fields can be handled in various different ways, for 8900 // example, unnamed unions inject all members into the struct namespace! 8901 8902 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8903 QualType T = TInfo->getType(); 8904 8905 if (BitWidth) { 8906 // 6.7.2.1p3, 6.7.2.1p4 8907 if (VerifyBitField(Loc, II, T, BitWidth)) { 8908 D.setInvalidType(); 8909 BitWidth = 0; 8910 } 8911 } else { 8912 // Not a bitfield. 8913 8914 // validate II. 8915 8916 } 8917 if (T->isReferenceType()) { 8918 Diag(Loc, diag::err_ivar_reference_type); 8919 D.setInvalidType(); 8920 } 8921 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8922 // than a variably modified type. 8923 else if (T->isVariablyModifiedType()) { 8924 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8925 D.setInvalidType(); 8926 } 8927 8928 // Get the visibility (access control) for this ivar. 8929 ObjCIvarDecl::AccessControl ac = 8930 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8931 : ObjCIvarDecl::None; 8932 // Must set ivar's DeclContext to its enclosing interface. 8933 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8934 ObjCContainerDecl *EnclosingContext; 8935 if (ObjCImplementationDecl *IMPDecl = 8936 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8937 if (!LangOpts.ObjCNonFragileABI2) { 8938 // Case of ivar declared in an implementation. Context is that of its class. 8939 EnclosingContext = IMPDecl->getClassInterface(); 8940 assert(EnclosingContext && "Implementation has no class interface!"); 8941 } 8942 else 8943 EnclosingContext = EnclosingDecl; 8944 } else { 8945 if (ObjCCategoryDecl *CDecl = 8946 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8947 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8948 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8949 return 0; 8950 } 8951 } 8952 EnclosingContext = EnclosingDecl; 8953 } 8954 8955 // Construct the decl. 8956 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8957 DeclStart, Loc, II, T, 8958 TInfo, ac, (Expr *)BitfieldWidth); 8959 8960 if (II) { 8961 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8962 ForRedeclaration); 8963 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8964 && !isa<TagDecl>(PrevDecl)) { 8965 Diag(Loc, diag::err_duplicate_member) << II; 8966 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8967 NewID->setInvalidDecl(); 8968 } 8969 } 8970 8971 // Process attributes attached to the ivar. 8972 ProcessDeclAttributes(S, NewID, D); 8973 8974 if (D.isInvalidType()) 8975 NewID->setInvalidDecl(); 8976 8977 // In ARC, infer 'retaining' for ivars of retainable type. 8978 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8979 NewID->setInvalidDecl(); 8980 8981 if (D.getDeclSpec().isModulePrivateSpecified()) 8982 NewID->setModulePrivate(); 8983 8984 if (II) { 8985 // FIXME: When interfaces are DeclContexts, we'll need to add 8986 // these to the interface. 8987 S->AddDecl(NewID); 8988 IdResolver.AddDecl(NewID); 8989 } 8990 8991 return NewID; 8992} 8993 8994/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8995/// class and class extensions. For every class @interface and class 8996/// extension @interface, if the last ivar is a bitfield of any type, 8997/// then add an implicit `char :0` ivar to the end of that interface. 8998void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8999 SmallVectorImpl<Decl *> &AllIvarDecls) { 9000 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9001 return; 9002 9003 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9004 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9005 9006 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9007 return; 9008 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9009 if (!ID) { 9010 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9011 if (!CD->IsClassExtension()) 9012 return; 9013 } 9014 // No need to add this to end of @implementation. 9015 else 9016 return; 9017 } 9018 // All conditions are met. Add a new bitfield to the tail end of ivars. 9019 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9020 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9021 9022 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9023 DeclLoc, DeclLoc, 0, 9024 Context.CharTy, 9025 Context.getTrivialTypeSourceInfo(Context.CharTy, 9026 DeclLoc), 9027 ObjCIvarDecl::Private, BW, 9028 true); 9029 AllIvarDecls.push_back(Ivar); 9030} 9031 9032void Sema::ActOnFields(Scope* S, 9033 SourceLocation RecLoc, Decl *EnclosingDecl, 9034 llvm::ArrayRef<Decl *> Fields, 9035 SourceLocation LBrac, SourceLocation RBrac, 9036 AttributeList *Attr) { 9037 assert(EnclosingDecl && "missing record or interface decl"); 9038 9039 // If the decl this is being inserted into is invalid, then it may be a 9040 // redeclaration or some other bogus case. Don't try to add fields to it. 9041 if (EnclosingDecl->isInvalidDecl()) 9042 return; 9043 9044 // Verify that all the fields are okay. 9045 unsigned NumNamedMembers = 0; 9046 SmallVector<FieldDecl*, 32> RecFields; 9047 9048 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9049 bool ARCErrReported = false; 9050 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9051 i != end; ++i) { 9052 FieldDecl *FD = cast<FieldDecl>(*i); 9053 9054 // Get the type for the field. 9055 const Type *FDTy = FD->getType().getTypePtr(); 9056 9057 if (!FD->isAnonymousStructOrUnion()) { 9058 // Remember all fields written by the user. 9059 RecFields.push_back(FD); 9060 } 9061 9062 // If the field is already invalid for some reason, don't emit more 9063 // diagnostics about it. 9064 if (FD->isInvalidDecl()) { 9065 EnclosingDecl->setInvalidDecl(); 9066 continue; 9067 } 9068 9069 // C99 6.7.2.1p2: 9070 // A structure or union shall not contain a member with 9071 // incomplete or function type (hence, a structure shall not 9072 // contain an instance of itself, but may contain a pointer to 9073 // an instance of itself), except that the last member of a 9074 // structure with more than one named member may have incomplete 9075 // array type; such a structure (and any union containing, 9076 // possibly recursively, a member that is such a structure) 9077 // shall not be a member of a structure or an element of an 9078 // array. 9079 if (FDTy->isFunctionType()) { 9080 // Field declared as a function. 9081 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9082 << FD->getDeclName(); 9083 FD->setInvalidDecl(); 9084 EnclosingDecl->setInvalidDecl(); 9085 continue; 9086 } else if (FDTy->isIncompleteArrayType() && Record && 9087 ((i + 1 == Fields.end() && !Record->isUnion()) || 9088 ((getLangOptions().MicrosoftExt || 9089 getLangOptions().CPlusPlus) && 9090 (i + 1 == Fields.end() || Record->isUnion())))) { 9091 // Flexible array member. 9092 // Microsoft and g++ is more permissive regarding flexible array. 9093 // It will accept flexible array in union and also 9094 // as the sole element of a struct/class. 9095 if (getLangOptions().MicrosoftExt) { 9096 if (Record->isUnion()) 9097 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9098 << FD->getDeclName(); 9099 else if (Fields.size() == 1) 9100 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9101 << FD->getDeclName() << Record->getTagKind(); 9102 } else if (getLangOptions().CPlusPlus) { 9103 if (Record->isUnion()) 9104 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9105 << FD->getDeclName(); 9106 else if (Fields.size() == 1) 9107 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9108 << FD->getDeclName() << Record->getTagKind(); 9109 } else if (NumNamedMembers < 1) { 9110 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9111 << FD->getDeclName(); 9112 FD->setInvalidDecl(); 9113 EnclosingDecl->setInvalidDecl(); 9114 continue; 9115 } 9116 if (!FD->getType()->isDependentType() && 9117 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9118 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9119 << FD->getDeclName() << FD->getType(); 9120 FD->setInvalidDecl(); 9121 EnclosingDecl->setInvalidDecl(); 9122 continue; 9123 } 9124 // Okay, we have a legal flexible array member at the end of the struct. 9125 if (Record) 9126 Record->setHasFlexibleArrayMember(true); 9127 } else if (!FDTy->isDependentType() && 9128 RequireCompleteType(FD->getLocation(), FD->getType(), 9129 diag::err_field_incomplete)) { 9130 // Incomplete type 9131 FD->setInvalidDecl(); 9132 EnclosingDecl->setInvalidDecl(); 9133 continue; 9134 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9135 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9136 // If this is a member of a union, then entire union becomes "flexible". 9137 if (Record && Record->isUnion()) { 9138 Record->setHasFlexibleArrayMember(true); 9139 } else { 9140 // If this is a struct/class and this is not the last element, reject 9141 // it. Note that GCC supports variable sized arrays in the middle of 9142 // structures. 9143 if (i + 1 != Fields.end()) 9144 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9145 << FD->getDeclName() << FD->getType(); 9146 else { 9147 // We support flexible arrays at the end of structs in 9148 // other structs as an extension. 9149 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9150 << FD->getDeclName(); 9151 if (Record) 9152 Record->setHasFlexibleArrayMember(true); 9153 } 9154 } 9155 } 9156 if (Record && FDTTy->getDecl()->hasObjectMember()) 9157 Record->setHasObjectMember(true); 9158 } else if (FDTy->isObjCObjectType()) { 9159 /// A field cannot be an Objective-c object 9160 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9161 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9162 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9163 FD->setType(T); 9164 } 9165 else if (!getLangOptions().CPlusPlus) { 9166 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9167 // It's an error in ARC if a field has lifetime. 9168 // We don't want to report this in a system header, though, 9169 // so we just make the field unavailable. 9170 // FIXME: that's really not sufficient; we need to make the type 9171 // itself invalid to, say, initialize or copy. 9172 QualType T = FD->getType(); 9173 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9174 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9175 SourceLocation loc = FD->getLocation(); 9176 if (getSourceManager().isInSystemHeader(loc)) { 9177 if (!FD->hasAttr<UnavailableAttr>()) { 9178 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9179 "this system field has retaining ownership")); 9180 } 9181 } else { 9182 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9183 } 9184 ARCErrReported = true; 9185 } 9186 } 9187 else if (getLangOptions().ObjC1 && 9188 getLangOptions().getGC() != LangOptions::NonGC && 9189 Record && !Record->hasObjectMember()) { 9190 if (FD->getType()->isObjCObjectPointerType() || 9191 FD->getType().isObjCGCStrong()) 9192 Record->setHasObjectMember(true); 9193 else if (Context.getAsArrayType(FD->getType())) { 9194 QualType BaseType = Context.getBaseElementType(FD->getType()); 9195 if (BaseType->isRecordType() && 9196 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9197 Record->setHasObjectMember(true); 9198 else if (BaseType->isObjCObjectPointerType() || 9199 BaseType.isObjCGCStrong()) 9200 Record->setHasObjectMember(true); 9201 } 9202 } 9203 } 9204 // Keep track of the number of named members. 9205 if (FD->getIdentifier()) 9206 ++NumNamedMembers; 9207 } 9208 9209 // Okay, we successfully defined 'Record'. 9210 if (Record) { 9211 bool Completed = false; 9212 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9213 if (!CXXRecord->isInvalidDecl()) { 9214 // Set access bits correctly on the directly-declared conversions. 9215 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9216 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9217 I != E; ++I) 9218 Convs->setAccess(I, (*I)->getAccess()); 9219 9220 if (!CXXRecord->isDependentType()) { 9221 // Objective-C Automatic Reference Counting: 9222 // If a class has a non-static data member of Objective-C pointer 9223 // type (or array thereof), it is a non-POD type and its 9224 // default constructor (if any), copy constructor, copy assignment 9225 // operator, and destructor are non-trivial. 9226 // 9227 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9228 // However, here we check whether this particular class is only 9229 // non-POD because of the presence of an Objective-C pointer member. 9230 // If so, objects of this type cannot be shared between code compiled 9231 // with instant objects and code compiled with manual retain/release. 9232 if (getLangOptions().ObjCAutoRefCount && 9233 CXXRecord->hasObjectMember() && 9234 CXXRecord->getLinkage() == ExternalLinkage) { 9235 if (CXXRecord->isPOD()) { 9236 Diag(CXXRecord->getLocation(), 9237 diag::warn_arc_non_pod_class_with_object_member) 9238 << CXXRecord; 9239 } else { 9240 // FIXME: Fix-Its would be nice here, but finding a good location 9241 // for them is going to be tricky. 9242 if (CXXRecord->hasTrivialCopyConstructor()) 9243 Diag(CXXRecord->getLocation(), 9244 diag::warn_arc_trivial_member_function_with_object_member) 9245 << CXXRecord << 0; 9246 if (CXXRecord->hasTrivialCopyAssignment()) 9247 Diag(CXXRecord->getLocation(), 9248 diag::warn_arc_trivial_member_function_with_object_member) 9249 << CXXRecord << 1; 9250 if (CXXRecord->hasTrivialDestructor()) 9251 Diag(CXXRecord->getLocation(), 9252 diag::warn_arc_trivial_member_function_with_object_member) 9253 << CXXRecord << 2; 9254 } 9255 } 9256 9257 // Adjust user-defined destructor exception spec. 9258 if (getLangOptions().CPlusPlus0x && 9259 CXXRecord->hasUserDeclaredDestructor()) 9260 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9261 9262 // Add any implicitly-declared members to this class. 9263 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9264 9265 // If we have virtual base classes, we may end up finding multiple 9266 // final overriders for a given virtual function. Check for this 9267 // problem now. 9268 if (CXXRecord->getNumVBases()) { 9269 CXXFinalOverriderMap FinalOverriders; 9270 CXXRecord->getFinalOverriders(FinalOverriders); 9271 9272 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9273 MEnd = FinalOverriders.end(); 9274 M != MEnd; ++M) { 9275 for (OverridingMethods::iterator SO = M->second.begin(), 9276 SOEnd = M->second.end(); 9277 SO != SOEnd; ++SO) { 9278 assert(SO->second.size() > 0 && 9279 "Virtual function without overridding functions?"); 9280 if (SO->second.size() == 1) 9281 continue; 9282 9283 // C++ [class.virtual]p2: 9284 // In a derived class, if a virtual member function of a base 9285 // class subobject has more than one final overrider the 9286 // program is ill-formed. 9287 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9288 << (NamedDecl *)M->first << Record; 9289 Diag(M->first->getLocation(), 9290 diag::note_overridden_virtual_function); 9291 for (OverridingMethods::overriding_iterator 9292 OM = SO->second.begin(), 9293 OMEnd = SO->second.end(); 9294 OM != OMEnd; ++OM) 9295 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9296 << (NamedDecl *)M->first << OM->Method->getParent(); 9297 9298 Record->setInvalidDecl(); 9299 } 9300 } 9301 CXXRecord->completeDefinition(&FinalOverriders); 9302 Completed = true; 9303 } 9304 } 9305 } 9306 } 9307 9308 if (!Completed) 9309 Record->completeDefinition(); 9310 9311 // Now that the record is complete, do any delayed exception spec checks 9312 // we were missing. 9313 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9314 const CXXDestructorDecl *Dtor = 9315 DelayedDestructorExceptionSpecChecks.back().first; 9316 if (Dtor->getParent() != Record) 9317 break; 9318 9319 assert(!Dtor->getParent()->isDependentType() && 9320 "Should not ever add destructors of templates into the list."); 9321 CheckOverridingFunctionExceptionSpec(Dtor, 9322 DelayedDestructorExceptionSpecChecks.back().second); 9323 DelayedDestructorExceptionSpecChecks.pop_back(); 9324 } 9325 9326 } else { 9327 ObjCIvarDecl **ClsFields = 9328 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9329 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9330 ID->setLocEnd(RBrac); 9331 // Add ivar's to class's DeclContext. 9332 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9333 ClsFields[i]->setLexicalDeclContext(ID); 9334 ID->addDecl(ClsFields[i]); 9335 } 9336 // Must enforce the rule that ivars in the base classes may not be 9337 // duplicates. 9338 if (ID->getSuperClass()) 9339 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9340 } else if (ObjCImplementationDecl *IMPDecl = 9341 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9342 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9343 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9344 // Ivar declared in @implementation never belongs to the implementation. 9345 // Only it is in implementation's lexical context. 9346 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9347 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9348 } else if (ObjCCategoryDecl *CDecl = 9349 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9350 // case of ivars in class extension; all other cases have been 9351 // reported as errors elsewhere. 9352 // FIXME. Class extension does not have a LocEnd field. 9353 // CDecl->setLocEnd(RBrac); 9354 // Add ivar's to class extension's DeclContext. 9355 // Diagnose redeclaration of private ivars. 9356 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9357 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9358 if (IDecl) { 9359 if (const ObjCIvarDecl *ClsIvar = 9360 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9361 Diag(ClsFields[i]->getLocation(), 9362 diag::err_duplicate_ivar_declaration); 9363 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9364 continue; 9365 } 9366 for (const ObjCCategoryDecl *ClsExtDecl = 9367 IDecl->getFirstClassExtension(); 9368 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9369 if (const ObjCIvarDecl *ClsExtIvar = 9370 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9371 Diag(ClsFields[i]->getLocation(), 9372 diag::err_duplicate_ivar_declaration); 9373 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9374 continue; 9375 } 9376 } 9377 } 9378 ClsFields[i]->setLexicalDeclContext(CDecl); 9379 CDecl->addDecl(ClsFields[i]); 9380 } 9381 } 9382 } 9383 9384 if (Attr) 9385 ProcessDeclAttributeList(S, Record, Attr); 9386 9387 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9388 // set the visibility of this record. 9389 if (Record && !Record->getDeclContext()->isRecord()) 9390 AddPushedVisibilityAttribute(Record); 9391} 9392 9393/// \brief Determine whether the given integral value is representable within 9394/// the given type T. 9395static bool isRepresentableIntegerValue(ASTContext &Context, 9396 llvm::APSInt &Value, 9397 QualType T) { 9398 assert(T->isIntegralType(Context) && "Integral type required!"); 9399 unsigned BitWidth = Context.getIntWidth(T); 9400 9401 if (Value.isUnsigned() || Value.isNonNegative()) { 9402 if (T->isSignedIntegerOrEnumerationType()) 9403 --BitWidth; 9404 return Value.getActiveBits() <= BitWidth; 9405 } 9406 return Value.getMinSignedBits() <= BitWidth; 9407} 9408 9409// \brief Given an integral type, return the next larger integral type 9410// (or a NULL type of no such type exists). 9411static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9412 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9413 // enum checking below. 9414 assert(T->isIntegralType(Context) && "Integral type required!"); 9415 const unsigned NumTypes = 4; 9416 QualType SignedIntegralTypes[NumTypes] = { 9417 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9418 }; 9419 QualType UnsignedIntegralTypes[NumTypes] = { 9420 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9421 Context.UnsignedLongLongTy 9422 }; 9423 9424 unsigned BitWidth = Context.getTypeSize(T); 9425 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9426 : UnsignedIntegralTypes; 9427 for (unsigned I = 0; I != NumTypes; ++I) 9428 if (Context.getTypeSize(Types[I]) > BitWidth) 9429 return Types[I]; 9430 9431 return QualType(); 9432} 9433 9434EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9435 EnumConstantDecl *LastEnumConst, 9436 SourceLocation IdLoc, 9437 IdentifierInfo *Id, 9438 Expr *Val) { 9439 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9440 llvm::APSInt EnumVal(IntWidth); 9441 QualType EltTy; 9442 9443 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9444 Val = 0; 9445 9446 if (Val) { 9447 if (Enum->isDependentType() || Val->isTypeDependent()) 9448 EltTy = Context.DependentTy; 9449 else { 9450 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9451 SourceLocation ExpLoc; 9452 if (!Val->isValueDependent() && 9453 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9454 Val = 0; 9455 } else { 9456 if (!getLangOptions().CPlusPlus) { 9457 // C99 6.7.2.2p2: 9458 // The expression that defines the value of an enumeration constant 9459 // shall be an integer constant expression that has a value 9460 // representable as an int. 9461 9462 // Complain if the value is not representable in an int. 9463 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9464 Diag(IdLoc, diag::ext_enum_value_not_int) 9465 << EnumVal.toString(10) << Val->getSourceRange() 9466 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9467 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9468 // Force the type of the expression to 'int'. 9469 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9470 } 9471 } 9472 9473 if (Enum->isFixed()) { 9474 EltTy = Enum->getIntegerType(); 9475 9476 // C++0x [dcl.enum]p5: 9477 // ... if the initializing value of an enumerator cannot be 9478 // represented by the underlying type, the program is ill-formed. 9479 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9480 if (getLangOptions().MicrosoftExt) { 9481 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9482 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9483 } else 9484 Diag(IdLoc, diag::err_enumerator_too_large) 9485 << EltTy; 9486 } else 9487 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9488 } 9489 else { 9490 // C++0x [dcl.enum]p5: 9491 // If the underlying type is not fixed, the type of each enumerator 9492 // is the type of its initializing value: 9493 // - If an initializer is specified for an enumerator, the 9494 // initializing value has the same type as the expression. 9495 EltTy = Val->getType(); 9496 } 9497 } 9498 } 9499 } 9500 9501 if (!Val) { 9502 if (Enum->isDependentType()) 9503 EltTy = Context.DependentTy; 9504 else if (!LastEnumConst) { 9505 // C++0x [dcl.enum]p5: 9506 // If the underlying type is not fixed, the type of each enumerator 9507 // is the type of its initializing value: 9508 // - If no initializer is specified for the first enumerator, the 9509 // initializing value has an unspecified integral type. 9510 // 9511 // GCC uses 'int' for its unspecified integral type, as does 9512 // C99 6.7.2.2p3. 9513 if (Enum->isFixed()) { 9514 EltTy = Enum->getIntegerType(); 9515 } 9516 else { 9517 EltTy = Context.IntTy; 9518 } 9519 } else { 9520 // Assign the last value + 1. 9521 EnumVal = LastEnumConst->getInitVal(); 9522 ++EnumVal; 9523 EltTy = LastEnumConst->getType(); 9524 9525 // Check for overflow on increment. 9526 if (EnumVal < LastEnumConst->getInitVal()) { 9527 // C++0x [dcl.enum]p5: 9528 // If the underlying type is not fixed, the type of each enumerator 9529 // is the type of its initializing value: 9530 // 9531 // - Otherwise the type of the initializing value is the same as 9532 // the type of the initializing value of the preceding enumerator 9533 // unless the incremented value is not representable in that type, 9534 // in which case the type is an unspecified integral type 9535 // sufficient to contain the incremented value. If no such type 9536 // exists, the program is ill-formed. 9537 QualType T = getNextLargerIntegralType(Context, EltTy); 9538 if (T.isNull() || Enum->isFixed()) { 9539 // There is no integral type larger enough to represent this 9540 // value. Complain, then allow the value to wrap around. 9541 EnumVal = LastEnumConst->getInitVal(); 9542 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9543 ++EnumVal; 9544 if (Enum->isFixed()) 9545 // When the underlying type is fixed, this is ill-formed. 9546 Diag(IdLoc, diag::err_enumerator_wrapped) 9547 << EnumVal.toString(10) 9548 << EltTy; 9549 else 9550 Diag(IdLoc, diag::warn_enumerator_too_large) 9551 << EnumVal.toString(10); 9552 } else { 9553 EltTy = T; 9554 } 9555 9556 // Retrieve the last enumerator's value, extent that type to the 9557 // type that is supposed to be large enough to represent the incremented 9558 // value, then increment. 9559 EnumVal = LastEnumConst->getInitVal(); 9560 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9561 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9562 ++EnumVal; 9563 9564 // If we're not in C++, diagnose the overflow of enumerator values, 9565 // which in C99 means that the enumerator value is not representable in 9566 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9567 // permits enumerator values that are representable in some larger 9568 // integral type. 9569 if (!getLangOptions().CPlusPlus && !T.isNull()) 9570 Diag(IdLoc, diag::warn_enum_value_overflow); 9571 } else if (!getLangOptions().CPlusPlus && 9572 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9573 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9574 Diag(IdLoc, diag::ext_enum_value_not_int) 9575 << EnumVal.toString(10) << 1; 9576 } 9577 } 9578 } 9579 9580 if (!EltTy->isDependentType()) { 9581 // Make the enumerator value match the signedness and size of the 9582 // enumerator's type. 9583 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9584 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9585 } 9586 9587 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9588 Val, EnumVal); 9589} 9590 9591 9592Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9593 SourceLocation IdLoc, IdentifierInfo *Id, 9594 AttributeList *Attr, 9595 SourceLocation EqualLoc, Expr *val) { 9596 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9597 EnumConstantDecl *LastEnumConst = 9598 cast_or_null<EnumConstantDecl>(lastEnumConst); 9599 Expr *Val = static_cast<Expr*>(val); 9600 9601 // The scope passed in may not be a decl scope. Zip up the scope tree until 9602 // we find one that is. 9603 S = getNonFieldDeclScope(S); 9604 9605 // Verify that there isn't already something declared with this name in this 9606 // scope. 9607 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9608 ForRedeclaration); 9609 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9610 // Maybe we will complain about the shadowed template parameter. 9611 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9612 // Just pretend that we didn't see the previous declaration. 9613 PrevDecl = 0; 9614 } 9615 9616 if (PrevDecl) { 9617 // When in C++, we may get a TagDecl with the same name; in this case the 9618 // enum constant will 'hide' the tag. 9619 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9620 "Received TagDecl when not in C++!"); 9621 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9622 if (isa<EnumConstantDecl>(PrevDecl)) 9623 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9624 else 9625 Diag(IdLoc, diag::err_redefinition) << Id; 9626 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9627 return 0; 9628 } 9629 } 9630 9631 // C++ [class.mem]p13: 9632 // If T is the name of a class, then each of the following shall have a 9633 // name different from T: 9634 // - every enumerator of every member of class T that is an enumerated 9635 // type 9636 if (CXXRecordDecl *Record 9637 = dyn_cast<CXXRecordDecl>( 9638 TheEnumDecl->getDeclContext()->getRedeclContext())) 9639 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9640 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9641 9642 EnumConstantDecl *New = 9643 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9644 9645 if (New) { 9646 // Process attributes. 9647 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9648 9649 // Register this decl in the current scope stack. 9650 New->setAccess(TheEnumDecl->getAccess()); 9651 PushOnScopeChains(New, S); 9652 } 9653 9654 return New; 9655} 9656 9657void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9658 SourceLocation RBraceLoc, Decl *EnumDeclX, 9659 Decl **Elements, unsigned NumElements, 9660 Scope *S, AttributeList *Attr) { 9661 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9662 QualType EnumType = Context.getTypeDeclType(Enum); 9663 9664 if (Attr) 9665 ProcessDeclAttributeList(S, Enum, Attr); 9666 9667 if (Enum->isDependentType()) { 9668 for (unsigned i = 0; i != NumElements; ++i) { 9669 EnumConstantDecl *ECD = 9670 cast_or_null<EnumConstantDecl>(Elements[i]); 9671 if (!ECD) continue; 9672 9673 ECD->setType(EnumType); 9674 } 9675 9676 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9677 return; 9678 } 9679 9680 // TODO: If the result value doesn't fit in an int, it must be a long or long 9681 // long value. ISO C does not support this, but GCC does as an extension, 9682 // emit a warning. 9683 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9684 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9685 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9686 9687 // Verify that all the values are okay, compute the size of the values, and 9688 // reverse the list. 9689 unsigned NumNegativeBits = 0; 9690 unsigned NumPositiveBits = 0; 9691 9692 // Keep track of whether all elements have type int. 9693 bool AllElementsInt = true; 9694 9695 for (unsigned i = 0; i != NumElements; ++i) { 9696 EnumConstantDecl *ECD = 9697 cast_or_null<EnumConstantDecl>(Elements[i]); 9698 if (!ECD) continue; // Already issued a diagnostic. 9699 9700 const llvm::APSInt &InitVal = ECD->getInitVal(); 9701 9702 // Keep track of the size of positive and negative values. 9703 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9704 NumPositiveBits = std::max(NumPositiveBits, 9705 (unsigned)InitVal.getActiveBits()); 9706 else 9707 NumNegativeBits = std::max(NumNegativeBits, 9708 (unsigned)InitVal.getMinSignedBits()); 9709 9710 // Keep track of whether every enum element has type int (very commmon). 9711 if (AllElementsInt) 9712 AllElementsInt = ECD->getType() == Context.IntTy; 9713 } 9714 9715 // Figure out the type that should be used for this enum. 9716 QualType BestType; 9717 unsigned BestWidth; 9718 9719 // C++0x N3000 [conv.prom]p3: 9720 // An rvalue of an unscoped enumeration type whose underlying 9721 // type is not fixed can be converted to an rvalue of the first 9722 // of the following types that can represent all the values of 9723 // the enumeration: int, unsigned int, long int, unsigned long 9724 // int, long long int, or unsigned long long int. 9725 // C99 6.4.4.3p2: 9726 // An identifier declared as an enumeration constant has type int. 9727 // The C99 rule is modified by a gcc extension 9728 QualType BestPromotionType; 9729 9730 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9731 // -fshort-enums is the equivalent to specifying the packed attribute on all 9732 // enum definitions. 9733 if (LangOpts.ShortEnums) 9734 Packed = true; 9735 9736 if (Enum->isFixed()) { 9737 BestType = Enum->getIntegerType(); 9738 if (BestType->isPromotableIntegerType()) 9739 BestPromotionType = Context.getPromotedIntegerType(BestType); 9740 else 9741 BestPromotionType = BestType; 9742 // We don't need to set BestWidth, because BestType is going to be the type 9743 // of the enumerators, but we do anyway because otherwise some compilers 9744 // warn that it might be used uninitialized. 9745 BestWidth = CharWidth; 9746 } 9747 else if (NumNegativeBits) { 9748 // If there is a negative value, figure out the smallest integer type (of 9749 // int/long/longlong) that fits. 9750 // If it's packed, check also if it fits a char or a short. 9751 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9752 BestType = Context.SignedCharTy; 9753 BestWidth = CharWidth; 9754 } else if (Packed && NumNegativeBits <= ShortWidth && 9755 NumPositiveBits < ShortWidth) { 9756 BestType = Context.ShortTy; 9757 BestWidth = ShortWidth; 9758 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9759 BestType = Context.IntTy; 9760 BestWidth = IntWidth; 9761 } else { 9762 BestWidth = Context.getTargetInfo().getLongWidth(); 9763 9764 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9765 BestType = Context.LongTy; 9766 } else { 9767 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9768 9769 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9770 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9771 BestType = Context.LongLongTy; 9772 } 9773 } 9774 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9775 } else { 9776 // If there is no negative value, figure out the smallest type that fits 9777 // all of the enumerator values. 9778 // If it's packed, check also if it fits a char or a short. 9779 if (Packed && NumPositiveBits <= CharWidth) { 9780 BestType = Context.UnsignedCharTy; 9781 BestPromotionType = Context.IntTy; 9782 BestWidth = CharWidth; 9783 } else if (Packed && NumPositiveBits <= ShortWidth) { 9784 BestType = Context.UnsignedShortTy; 9785 BestPromotionType = Context.IntTy; 9786 BestWidth = ShortWidth; 9787 } else if (NumPositiveBits <= IntWidth) { 9788 BestType = Context.UnsignedIntTy; 9789 BestWidth = IntWidth; 9790 BestPromotionType 9791 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9792 ? Context.UnsignedIntTy : Context.IntTy; 9793 } else if (NumPositiveBits <= 9794 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9795 BestType = Context.UnsignedLongTy; 9796 BestPromotionType 9797 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9798 ? Context.UnsignedLongTy : Context.LongTy; 9799 } else { 9800 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9801 assert(NumPositiveBits <= BestWidth && 9802 "How could an initializer get larger than ULL?"); 9803 BestType = Context.UnsignedLongLongTy; 9804 BestPromotionType 9805 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9806 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9807 } 9808 } 9809 9810 // Loop over all of the enumerator constants, changing their types to match 9811 // the type of the enum if needed. 9812 for (unsigned i = 0; i != NumElements; ++i) { 9813 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9814 if (!ECD) continue; // Already issued a diagnostic. 9815 9816 // Standard C says the enumerators have int type, but we allow, as an 9817 // extension, the enumerators to be larger than int size. If each 9818 // enumerator value fits in an int, type it as an int, otherwise type it the 9819 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9820 // that X has type 'int', not 'unsigned'. 9821 9822 // Determine whether the value fits into an int. 9823 llvm::APSInt InitVal = ECD->getInitVal(); 9824 9825 // If it fits into an integer type, force it. Otherwise force it to match 9826 // the enum decl type. 9827 QualType NewTy; 9828 unsigned NewWidth; 9829 bool NewSign; 9830 if (!getLangOptions().CPlusPlus && 9831 !Enum->isFixed() && 9832 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9833 NewTy = Context.IntTy; 9834 NewWidth = IntWidth; 9835 NewSign = true; 9836 } else if (ECD->getType() == BestType) { 9837 // Already the right type! 9838 if (getLangOptions().CPlusPlus) 9839 // C++ [dcl.enum]p4: Following the closing brace of an 9840 // enum-specifier, each enumerator has the type of its 9841 // enumeration. 9842 ECD->setType(EnumType); 9843 continue; 9844 } else { 9845 NewTy = BestType; 9846 NewWidth = BestWidth; 9847 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9848 } 9849 9850 // Adjust the APSInt value. 9851 InitVal = InitVal.extOrTrunc(NewWidth); 9852 InitVal.setIsSigned(NewSign); 9853 ECD->setInitVal(InitVal); 9854 9855 // Adjust the Expr initializer and type. 9856 if (ECD->getInitExpr() && 9857 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9858 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9859 CK_IntegralCast, 9860 ECD->getInitExpr(), 9861 /*base paths*/ 0, 9862 VK_RValue)); 9863 if (getLangOptions().CPlusPlus) 9864 // C++ [dcl.enum]p4: Following the closing brace of an 9865 // enum-specifier, each enumerator has the type of its 9866 // enumeration. 9867 ECD->setType(EnumType); 9868 else 9869 ECD->setType(NewTy); 9870 } 9871 9872 Enum->completeDefinition(BestType, BestPromotionType, 9873 NumPositiveBits, NumNegativeBits); 9874} 9875 9876Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9877 SourceLocation StartLoc, 9878 SourceLocation EndLoc) { 9879 StringLiteral *AsmString = cast<StringLiteral>(expr); 9880 9881 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9882 AsmString, StartLoc, 9883 EndLoc); 9884 CurContext->addDecl(New); 9885 return New; 9886} 9887 9888DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9889 IdentifierInfo &ModuleName, 9890 SourceLocation ModuleNameLoc) { 9891 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9892 ModuleName, ModuleNameLoc); 9893 if (!Module) 9894 return true; 9895 9896 // FIXME: Actually create a declaration to describe the module import. 9897 (void)Module; 9898 return DeclResult((Decl *)0); 9899} 9900 9901void 9902Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9903 SourceLocation ModulePrivateKeyword) { 9904 assert(!Old->isModulePrivate() && "Old is module-private!"); 9905 9906 Diag(New->getLocation(), diag::err_module_private_follows_public) 9907 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9908 Diag(Old->getLocation(), diag::note_previous_declaration) 9909 << Old->getDeclName(); 9910 9911 // Drop the __module_private__ from the new declaration, since it's invalid. 9912 New->setModulePrivate(false); 9913} 9914 9915void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9916 SourceLocation PragmaLoc, 9917 SourceLocation NameLoc) { 9918 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9919 9920 if (PrevDecl) { 9921 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9922 } else { 9923 (void)WeakUndeclaredIdentifiers.insert( 9924 std::pair<IdentifierInfo*,WeakInfo> 9925 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9926 } 9927} 9928 9929void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9930 IdentifierInfo* AliasName, 9931 SourceLocation PragmaLoc, 9932 SourceLocation NameLoc, 9933 SourceLocation AliasNameLoc) { 9934 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9935 LookupOrdinaryName); 9936 WeakInfo W = WeakInfo(Name, NameLoc); 9937 9938 if (PrevDecl) { 9939 if (!PrevDecl->hasAttr<AliasAttr>()) 9940 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9941 DeclApplyPragmaWeak(TUScope, ND, W); 9942 } else { 9943 (void)WeakUndeclaredIdentifiers.insert( 9944 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9945 } 9946} 9947 9948Decl *Sema::getObjCDeclContext() const { 9949 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9950} 9951 9952AvailabilityResult Sema::getCurContextAvailability() const { 9953 const Decl *D = cast<Decl>(getCurLexicalContext()); 9954 // A category implicitly has the availability of the interface. 9955 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9956 D = CatD->getClassInterface(); 9957 9958 return D->getAvailability(); 9959} 9960