SemaDecl.cpp revision 749e95ee8353dff9a6d1137ec4556971d27a9f87
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 941bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 942 bool ExplicitInstantiationOrSpecialization) { 943 return IdResolver.isDeclInScope(D, Ctx, Context, S, 944 ExplicitInstantiationOrSpecialization); 945} 946 947Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 948 DeclContext *TargetDC = DC->getPrimaryContext(); 949 do { 950 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 951 if (ScopeDC->getPrimaryContext() == TargetDC) 952 return S; 953 } while ((S = S->getParent())); 954 955 return 0; 956} 957 958static bool isOutOfScopePreviousDeclaration(NamedDecl *, 959 DeclContext*, 960 ASTContext&); 961 962/// Filters out lookup results that don't fall within the given scope 963/// as determined by isDeclInScope. 964void Sema::FilterLookupForScope(LookupResult &R, 965 DeclContext *Ctx, Scope *S, 966 bool ConsiderLinkage, 967 bool ExplicitInstantiationOrSpecialization) { 968 LookupResult::Filter F = R.makeFilter(); 969 while (F.hasNext()) { 970 NamedDecl *D = F.next(); 971 972 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 973 continue; 974 975 if (ConsiderLinkage && 976 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 977 continue; 978 979 F.erase(); 980 } 981 982 F.done(); 983} 984 985static bool isUsingDecl(NamedDecl *D) { 986 return isa<UsingShadowDecl>(D) || 987 isa<UnresolvedUsingTypenameDecl>(D) || 988 isa<UnresolvedUsingValueDecl>(D); 989} 990 991/// Removes using shadow declarations from the lookup results. 992static void RemoveUsingDecls(LookupResult &R) { 993 LookupResult::Filter F = R.makeFilter(); 994 while (F.hasNext()) 995 if (isUsingDecl(F.next())) 996 F.erase(); 997 998 F.done(); 999} 1000 1001/// \brief Check for this common pattern: 1002/// @code 1003/// class S { 1004/// S(const S&); // DO NOT IMPLEMENT 1005/// void operator=(const S&); // DO NOT IMPLEMENT 1006/// }; 1007/// @endcode 1008static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1009 // FIXME: Should check for private access too but access is set after we get 1010 // the decl here. 1011 if (D->doesThisDeclarationHaveABody()) 1012 return false; 1013 1014 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1015 return CD->isCopyConstructor(); 1016 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1017 return Method->isCopyAssignmentOperator(); 1018 return false; 1019} 1020 1021bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1022 assert(D); 1023 1024 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 // Ignore class templates. 1028 if (D->getDeclContext()->isDependentContext() || 1029 D->getLexicalDeclContext()->isDependentContext()) 1030 return false; 1031 1032 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1033 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1034 return false; 1035 1036 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1037 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1038 return false; 1039 } else { 1040 // 'static inline' functions are used in headers; don't warn. 1041 if (FD->getStorageClass() == SC_Static && 1042 FD->isInlineSpecified()) 1043 return false; 1044 } 1045 1046 if (FD->doesThisDeclarationHaveABody() && 1047 Context.DeclMustBeEmitted(FD)) 1048 return false; 1049 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1050 if (!VD->isFileVarDecl() || 1051 VD->getType().isConstant(Context) || 1052 Context.DeclMustBeEmitted(VD)) 1053 return false; 1054 1055 if (VD->isStaticDataMember() && 1056 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1057 return false; 1058 1059 } else { 1060 return false; 1061 } 1062 1063 // Only warn for unused decls internal to the translation unit. 1064 if (D->getLinkage() == ExternalLinkage) 1065 return false; 1066 1067 return true; 1068} 1069 1070void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1071 if (!D) 1072 return; 1073 1074 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1075 const FunctionDecl *First = FD->getFirstDeclaration(); 1076 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1077 return; // First should already be in the vector. 1078 } 1079 1080 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1081 const VarDecl *First = VD->getFirstDeclaration(); 1082 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1083 return; // First should already be in the vector. 1084 } 1085 1086 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1087 UnusedFileScopedDecls.push_back(D); 1088 } 1089 1090static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1091 if (D->isInvalidDecl()) 1092 return false; 1093 1094 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1095 return false; 1096 1097 if (isa<LabelDecl>(D)) 1098 return true; 1099 1100 // White-list anything that isn't a local variable. 1101 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1102 !D->getDeclContext()->isFunctionOrMethod()) 1103 return false; 1104 1105 // Types of valid local variables should be complete, so this should succeed. 1106 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1107 1108 // White-list anything with an __attribute__((unused)) type. 1109 QualType Ty = VD->getType(); 1110 1111 // Only look at the outermost level of typedef. 1112 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1113 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1114 return false; 1115 } 1116 1117 // If we failed to complete the type for some reason, or if the type is 1118 // dependent, don't diagnose the variable. 1119 if (Ty->isIncompleteType() || Ty->isDependentType()) 1120 return false; 1121 1122 if (const TagType *TT = Ty->getAs<TagType>()) { 1123 const TagDecl *Tag = TT->getDecl(); 1124 if (Tag->hasAttr<UnusedAttr>()) 1125 return false; 1126 1127 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1128 // FIXME: Checking for the presence of a user-declared constructor 1129 // isn't completely accurate; we'd prefer to check that the initializer 1130 // has no side effects. 1131 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1132 return false; 1133 } 1134 } 1135 1136 // TODO: __attribute__((unused)) templates? 1137 } 1138 1139 return true; 1140} 1141 1142static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1143 FixItHint &Hint) { 1144 if (isa<LabelDecl>(D)) { 1145 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1146 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1147 if (AfterColon.isInvalid()) 1148 return; 1149 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1150 getCharRange(D->getLocStart(), AfterColon)); 1151 } 1152 return; 1153} 1154 1155/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1156/// unless they are marked attr(unused). 1157void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1158 FixItHint Hint; 1159 if (!ShouldDiagnoseUnusedDecl(D)) 1160 return; 1161 1162 GenerateFixForUnusedDecl(D, Context, Hint); 1163 1164 unsigned DiagID; 1165 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1166 DiagID = diag::warn_unused_exception_param; 1167 else if (isa<LabelDecl>(D)) 1168 DiagID = diag::warn_unused_label; 1169 else 1170 DiagID = diag::warn_unused_variable; 1171 1172 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1173} 1174 1175static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1176 // Verify that we have no forward references left. If so, there was a goto 1177 // or address of a label taken, but no definition of it. Label fwd 1178 // definitions are indicated with a null substmt. 1179 if (L->getStmt() == 0) 1180 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1181} 1182 1183void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1184 if (S->decl_empty()) return; 1185 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1186 "Scope shouldn't contain decls!"); 1187 1188 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1189 I != E; ++I) { 1190 Decl *TmpD = (*I); 1191 assert(TmpD && "This decl didn't get pushed??"); 1192 1193 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1194 NamedDecl *D = cast<NamedDecl>(TmpD); 1195 1196 if (!D->getDeclName()) continue; 1197 1198 // Diagnose unused variables in this scope. 1199 if (!S->hasErrorOccurred()) 1200 DiagnoseUnusedDecl(D); 1201 1202 // If this was a forward reference to a label, verify it was defined. 1203 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1204 CheckPoppedLabel(LD, *this); 1205 1206 // Remove this name from our lexical scope. 1207 IdResolver.RemoveDecl(D); 1208 } 1209} 1210 1211/// \brief Look for an Objective-C class in the translation unit. 1212/// 1213/// \param Id The name of the Objective-C class we're looking for. If 1214/// typo-correction fixes this name, the Id will be updated 1215/// to the fixed name. 1216/// 1217/// \param IdLoc The location of the name in the translation unit. 1218/// 1219/// \param TypoCorrection If true, this routine will attempt typo correction 1220/// if there is no class with the given name. 1221/// 1222/// \returns The declaration of the named Objective-C class, or NULL if the 1223/// class could not be found. 1224ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1225 SourceLocation IdLoc, 1226 bool DoTypoCorrection) { 1227 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1228 // creation from this context. 1229 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1230 1231 if (!IDecl && DoTypoCorrection) { 1232 // Perform typo correction at the given location, but only if we 1233 // find an Objective-C class name. 1234 TypoCorrection C; 1235 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1236 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1237 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1238 Diag(IdLoc, diag::err_undef_interface_suggest) 1239 << Id << IDecl->getDeclName() 1240 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1241 Diag(IDecl->getLocation(), diag::note_previous_decl) 1242 << IDecl->getDeclName(); 1243 1244 Id = IDecl->getIdentifier(); 1245 } 1246 } 1247 1248 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1249} 1250 1251/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1252/// from S, where a non-field would be declared. This routine copes 1253/// with the difference between C and C++ scoping rules in structs and 1254/// unions. For example, the following code is well-formed in C but 1255/// ill-formed in C++: 1256/// @code 1257/// struct S6 { 1258/// enum { BAR } e; 1259/// }; 1260/// 1261/// void test_S6() { 1262/// struct S6 a; 1263/// a.e = BAR; 1264/// } 1265/// @endcode 1266/// For the declaration of BAR, this routine will return a different 1267/// scope. The scope S will be the scope of the unnamed enumeration 1268/// within S6. In C++, this routine will return the scope associated 1269/// with S6, because the enumeration's scope is a transparent 1270/// context but structures can contain non-field names. In C, this 1271/// routine will return the translation unit scope, since the 1272/// enumeration's scope is a transparent context and structures cannot 1273/// contain non-field names. 1274Scope *Sema::getNonFieldDeclScope(Scope *S) { 1275 while (((S->getFlags() & Scope::DeclScope) == 0) || 1276 (S->getEntity() && 1277 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1278 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1279 S = S->getParent(); 1280 return S; 1281} 1282 1283/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1284/// file scope. lazily create a decl for it. ForRedeclaration is true 1285/// if we're creating this built-in in anticipation of redeclaring the 1286/// built-in. 1287NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1288 Scope *S, bool ForRedeclaration, 1289 SourceLocation Loc) { 1290 Builtin::ID BID = (Builtin::ID)bid; 1291 1292 ASTContext::GetBuiltinTypeError Error; 1293 QualType R = Context.GetBuiltinType(BID, Error); 1294 switch (Error) { 1295 case ASTContext::GE_None: 1296 // Okay 1297 break; 1298 1299 case ASTContext::GE_Missing_stdio: 1300 if (ForRedeclaration) 1301 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1302 << Context.BuiltinInfo.GetName(BID); 1303 return 0; 1304 1305 case ASTContext::GE_Missing_setjmp: 1306 if (ForRedeclaration) 1307 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1308 << Context.BuiltinInfo.GetName(BID); 1309 return 0; 1310 } 1311 1312 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1313 Diag(Loc, diag::ext_implicit_lib_function_decl) 1314 << Context.BuiltinInfo.GetName(BID) 1315 << R; 1316 if (Context.BuiltinInfo.getHeaderName(BID) && 1317 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1318 != DiagnosticsEngine::Ignored) 1319 Diag(Loc, diag::note_please_include_header) 1320 << Context.BuiltinInfo.getHeaderName(BID) 1321 << Context.BuiltinInfo.GetName(BID); 1322 } 1323 1324 FunctionDecl *New = FunctionDecl::Create(Context, 1325 Context.getTranslationUnitDecl(), 1326 Loc, Loc, II, R, /*TInfo=*/0, 1327 SC_Extern, 1328 SC_None, false, 1329 /*hasPrototype=*/true); 1330 New->setImplicit(); 1331 1332 // Create Decl objects for each parameter, adding them to the 1333 // FunctionDecl. 1334 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1335 SmallVector<ParmVarDecl*, 16> Params; 1336 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1337 ParmVarDecl *parm = 1338 ParmVarDecl::Create(Context, New, SourceLocation(), 1339 SourceLocation(), 0, 1340 FT->getArgType(i), /*TInfo=*/0, 1341 SC_None, SC_None, 0); 1342 parm->setScopeInfo(0, i); 1343 Params.push_back(parm); 1344 } 1345 New->setParams(Params); 1346 } 1347 1348 AddKnownFunctionAttributes(New); 1349 1350 // TUScope is the translation-unit scope to insert this function into. 1351 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1352 // relate Scopes to DeclContexts, and probably eliminate CurContext 1353 // entirely, but we're not there yet. 1354 DeclContext *SavedContext = CurContext; 1355 CurContext = Context.getTranslationUnitDecl(); 1356 PushOnScopeChains(New, TUScope); 1357 CurContext = SavedContext; 1358 return New; 1359} 1360 1361/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1362/// same name and scope as a previous declaration 'Old'. Figure out 1363/// how to resolve this situation, merging decls or emitting 1364/// diagnostics as appropriate. If there was an error, set New to be invalid. 1365/// 1366void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1367 // If the new decl is known invalid already, don't bother doing any 1368 // merging checks. 1369 if (New->isInvalidDecl()) return; 1370 1371 // Allow multiple definitions for ObjC built-in typedefs. 1372 // FIXME: Verify the underlying types are equivalent! 1373 if (getLangOptions().ObjC1) { 1374 const IdentifierInfo *TypeID = New->getIdentifier(); 1375 switch (TypeID->getLength()) { 1376 default: break; 1377 case 2: 1378 if (!TypeID->isStr("id")) 1379 break; 1380 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1381 // Install the built-in type for 'id', ignoring the current definition. 1382 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1383 return; 1384 case 5: 1385 if (!TypeID->isStr("Class")) 1386 break; 1387 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1388 // Install the built-in type for 'Class', ignoring the current definition. 1389 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1390 return; 1391 case 3: 1392 if (!TypeID->isStr("SEL")) 1393 break; 1394 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1395 // Install the built-in type for 'SEL', ignoring the current definition. 1396 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1397 return; 1398 } 1399 // Fall through - the typedef name was not a builtin type. 1400 } 1401 1402 // Verify the old decl was also a type. 1403 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1404 if (!Old) { 1405 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1406 << New->getDeclName(); 1407 1408 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1409 if (OldD->getLocation().isValid()) 1410 Diag(OldD->getLocation(), diag::note_previous_definition); 1411 1412 return New->setInvalidDecl(); 1413 } 1414 1415 // If the old declaration is invalid, just give up here. 1416 if (Old->isInvalidDecl()) 1417 return New->setInvalidDecl(); 1418 1419 // Determine the "old" type we'll use for checking and diagnostics. 1420 QualType OldType; 1421 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1422 OldType = OldTypedef->getUnderlyingType(); 1423 else 1424 OldType = Context.getTypeDeclType(Old); 1425 1426 // If the typedef types are not identical, reject them in all languages and 1427 // with any extensions enabled. 1428 1429 if (OldType != New->getUnderlyingType() && 1430 Context.getCanonicalType(OldType) != 1431 Context.getCanonicalType(New->getUnderlyingType())) { 1432 int Kind = 0; 1433 if (isa<TypeAliasDecl>(Old)) 1434 Kind = 1; 1435 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1436 << Kind << New->getUnderlyingType() << OldType; 1437 if (Old->getLocation().isValid()) 1438 Diag(Old->getLocation(), diag::note_previous_definition); 1439 return New->setInvalidDecl(); 1440 } 1441 1442 // The types match. Link up the redeclaration chain if the old 1443 // declaration was a typedef. 1444 // FIXME: this is a potential source of weirdness if the type 1445 // spellings don't match exactly. 1446 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1447 New->setPreviousDeclaration(Typedef); 1448 1449 // __module_private__ is propagated to later declarations. 1450 if (Old->isModulePrivate()) 1451 New->setModulePrivate(); 1452 else if (New->isModulePrivate()) 1453 diagnoseModulePrivateRedeclaration(New, Old); 1454 1455 if (getLangOptions().MicrosoftExt) 1456 return; 1457 1458 if (getLangOptions().CPlusPlus) { 1459 // C++ [dcl.typedef]p2: 1460 // In a given non-class scope, a typedef specifier can be used to 1461 // redefine the name of any type declared in that scope to refer 1462 // to the type to which it already refers. 1463 if (!isa<CXXRecordDecl>(CurContext)) 1464 return; 1465 1466 // C++0x [dcl.typedef]p4: 1467 // In a given class scope, a typedef specifier can be used to redefine 1468 // any class-name declared in that scope that is not also a typedef-name 1469 // to refer to the type to which it already refers. 1470 // 1471 // This wording came in via DR424, which was a correction to the 1472 // wording in DR56, which accidentally banned code like: 1473 // 1474 // struct S { 1475 // typedef struct A { } A; 1476 // }; 1477 // 1478 // in the C++03 standard. We implement the C++0x semantics, which 1479 // allow the above but disallow 1480 // 1481 // struct S { 1482 // typedef int I; 1483 // typedef int I; 1484 // }; 1485 // 1486 // since that was the intent of DR56. 1487 if (!isa<TypedefNameDecl>(Old)) 1488 return; 1489 1490 Diag(New->getLocation(), diag::err_redefinition) 1491 << New->getDeclName(); 1492 Diag(Old->getLocation(), diag::note_previous_definition); 1493 return New->setInvalidDecl(); 1494 } 1495 1496 // If we have a redefinition of a typedef in C, emit a warning. This warning 1497 // is normally mapped to an error, but can be controlled with 1498 // -Wtypedef-redefinition. If either the original or the redefinition is 1499 // in a system header, don't emit this for compatibility with GCC. 1500 if (getDiagnostics().getSuppressSystemWarnings() && 1501 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1502 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1503 return; 1504 1505 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1506 << New->getDeclName(); 1507 Diag(Old->getLocation(), diag::note_previous_definition); 1508 return; 1509} 1510 1511/// DeclhasAttr - returns true if decl Declaration already has the target 1512/// attribute. 1513static bool 1514DeclHasAttr(const Decl *D, const Attr *A) { 1515 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1516 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1517 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1518 if ((*i)->getKind() == A->getKind()) { 1519 if (Ann) { 1520 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1521 return true; 1522 continue; 1523 } 1524 // FIXME: Don't hardcode this check 1525 if (OA && isa<OwnershipAttr>(*i)) 1526 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1527 return true; 1528 } 1529 1530 return false; 1531} 1532 1533/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1534static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1535 ASTContext &C, bool mergeDeprecation = true) { 1536 if (!oldDecl->hasAttrs()) 1537 return; 1538 1539 bool foundAny = newDecl->hasAttrs(); 1540 1541 // Ensure that any moving of objects within the allocated map is done before 1542 // we process them. 1543 if (!foundAny) newDecl->setAttrs(AttrVec()); 1544 1545 for (specific_attr_iterator<InheritableAttr> 1546 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1547 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1548 // Ignore deprecated/unavailable/availability attributes if requested. 1549 if (!mergeDeprecation && 1550 (isa<DeprecatedAttr>(*i) || 1551 isa<UnavailableAttr>(*i) || 1552 isa<AvailabilityAttr>(*i))) 1553 continue; 1554 1555 if (!DeclHasAttr(newDecl, *i)) { 1556 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1557 newAttr->setInherited(true); 1558 newDecl->addAttr(newAttr); 1559 foundAny = true; 1560 } 1561 } 1562 1563 if (!foundAny) newDecl->dropAttrs(); 1564} 1565 1566/// mergeParamDeclAttributes - Copy attributes from the old parameter 1567/// to the new one. 1568static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1569 const ParmVarDecl *oldDecl, 1570 ASTContext &C) { 1571 if (!oldDecl->hasAttrs()) 1572 return; 1573 1574 bool foundAny = newDecl->hasAttrs(); 1575 1576 // Ensure that any moving of objects within the allocated map is 1577 // done before we process them. 1578 if (!foundAny) newDecl->setAttrs(AttrVec()); 1579 1580 for (specific_attr_iterator<InheritableParamAttr> 1581 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1582 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1583 if (!DeclHasAttr(newDecl, *i)) { 1584 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1585 newAttr->setInherited(true); 1586 newDecl->addAttr(newAttr); 1587 foundAny = true; 1588 } 1589 } 1590 1591 if (!foundAny) newDecl->dropAttrs(); 1592} 1593 1594namespace { 1595 1596/// Used in MergeFunctionDecl to keep track of function parameters in 1597/// C. 1598struct GNUCompatibleParamWarning { 1599 ParmVarDecl *OldParm; 1600 ParmVarDecl *NewParm; 1601 QualType PromotedType; 1602}; 1603 1604} 1605 1606/// getSpecialMember - get the special member enum for a method. 1607Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1608 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1609 if (Ctor->isDefaultConstructor()) 1610 return Sema::CXXDefaultConstructor; 1611 1612 if (Ctor->isCopyConstructor()) 1613 return Sema::CXXCopyConstructor; 1614 1615 if (Ctor->isMoveConstructor()) 1616 return Sema::CXXMoveConstructor; 1617 } else if (isa<CXXDestructorDecl>(MD)) { 1618 return Sema::CXXDestructor; 1619 } else if (MD->isCopyAssignmentOperator()) { 1620 return Sema::CXXCopyAssignment; 1621 } else if (MD->isMoveAssignmentOperator()) { 1622 return Sema::CXXMoveAssignment; 1623 } 1624 1625 return Sema::CXXInvalid; 1626} 1627 1628/// canRedefineFunction - checks if a function can be redefined. Currently, 1629/// only extern inline functions can be redefined, and even then only in 1630/// GNU89 mode. 1631static bool canRedefineFunction(const FunctionDecl *FD, 1632 const LangOptions& LangOpts) { 1633 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1634 !LangOpts.CPlusPlus && 1635 FD->isInlineSpecified() && 1636 FD->getStorageClass() == SC_Extern); 1637} 1638 1639/// MergeFunctionDecl - We just parsed a function 'New' from 1640/// declarator D which has the same name and scope as a previous 1641/// declaration 'Old'. Figure out how to resolve this situation, 1642/// merging decls or emitting diagnostics as appropriate. 1643/// 1644/// In C++, New and Old must be declarations that are not 1645/// overloaded. Use IsOverload to determine whether New and Old are 1646/// overloaded, and to select the Old declaration that New should be 1647/// merged with. 1648/// 1649/// Returns true if there was an error, false otherwise. 1650bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1651 // Verify the old decl was also a function. 1652 FunctionDecl *Old = 0; 1653 if (FunctionTemplateDecl *OldFunctionTemplate 1654 = dyn_cast<FunctionTemplateDecl>(OldD)) 1655 Old = OldFunctionTemplate->getTemplatedDecl(); 1656 else 1657 Old = dyn_cast<FunctionDecl>(OldD); 1658 if (!Old) { 1659 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1660 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1661 Diag(Shadow->getTargetDecl()->getLocation(), 1662 diag::note_using_decl_target); 1663 Diag(Shadow->getUsingDecl()->getLocation(), 1664 diag::note_using_decl) << 0; 1665 return true; 1666 } 1667 1668 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1669 << New->getDeclName(); 1670 Diag(OldD->getLocation(), diag::note_previous_definition); 1671 return true; 1672 } 1673 1674 // Determine whether the previous declaration was a definition, 1675 // implicit declaration, or a declaration. 1676 diag::kind PrevDiag; 1677 if (Old->isThisDeclarationADefinition()) 1678 PrevDiag = diag::note_previous_definition; 1679 else if (Old->isImplicit()) 1680 PrevDiag = diag::note_previous_implicit_declaration; 1681 else 1682 PrevDiag = diag::note_previous_declaration; 1683 1684 QualType OldQType = Context.getCanonicalType(Old->getType()); 1685 QualType NewQType = Context.getCanonicalType(New->getType()); 1686 1687 // Don't complain about this if we're in GNU89 mode and the old function 1688 // is an extern inline function. 1689 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1690 New->getStorageClass() == SC_Static && 1691 Old->getStorageClass() != SC_Static && 1692 !canRedefineFunction(Old, getLangOptions())) { 1693 if (getLangOptions().MicrosoftExt) { 1694 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1695 Diag(Old->getLocation(), PrevDiag); 1696 } else { 1697 Diag(New->getLocation(), diag::err_static_non_static) << New; 1698 Diag(Old->getLocation(), PrevDiag); 1699 return true; 1700 } 1701 } 1702 1703 // If a function is first declared with a calling convention, but is 1704 // later declared or defined without one, the second decl assumes the 1705 // calling convention of the first. 1706 // 1707 // For the new decl, we have to look at the NON-canonical type to tell the 1708 // difference between a function that really doesn't have a calling 1709 // convention and one that is declared cdecl. That's because in 1710 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1711 // because it is the default calling convention. 1712 // 1713 // Note also that we DO NOT return at this point, because we still have 1714 // other tests to run. 1715 const FunctionType *OldType = cast<FunctionType>(OldQType); 1716 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1717 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1718 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1719 bool RequiresAdjustment = false; 1720 if (OldTypeInfo.getCC() != CC_Default && 1721 NewTypeInfo.getCC() == CC_Default) { 1722 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1723 RequiresAdjustment = true; 1724 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1725 NewTypeInfo.getCC())) { 1726 // Calling conventions really aren't compatible, so complain. 1727 Diag(New->getLocation(), diag::err_cconv_change) 1728 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1729 << (OldTypeInfo.getCC() == CC_Default) 1730 << (OldTypeInfo.getCC() == CC_Default ? "" : 1731 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1732 Diag(Old->getLocation(), diag::note_previous_declaration); 1733 return true; 1734 } 1735 1736 // FIXME: diagnose the other way around? 1737 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1738 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1739 RequiresAdjustment = true; 1740 } 1741 1742 // Merge regparm attribute. 1743 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1744 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1745 if (NewTypeInfo.getHasRegParm()) { 1746 Diag(New->getLocation(), diag::err_regparm_mismatch) 1747 << NewType->getRegParmType() 1748 << OldType->getRegParmType(); 1749 Diag(Old->getLocation(), diag::note_previous_declaration); 1750 return true; 1751 } 1752 1753 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1754 RequiresAdjustment = true; 1755 } 1756 1757 // Merge ns_returns_retained attribute. 1758 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1759 if (NewTypeInfo.getProducesResult()) { 1760 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1761 Diag(Old->getLocation(), diag::note_previous_declaration); 1762 return true; 1763 } 1764 1765 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1766 RequiresAdjustment = true; 1767 } 1768 1769 if (RequiresAdjustment) { 1770 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1771 New->setType(QualType(NewType, 0)); 1772 NewQType = Context.getCanonicalType(New->getType()); 1773 } 1774 1775 if (getLangOptions().CPlusPlus) { 1776 // (C++98 13.1p2): 1777 // Certain function declarations cannot be overloaded: 1778 // -- Function declarations that differ only in the return type 1779 // cannot be overloaded. 1780 QualType OldReturnType = OldType->getResultType(); 1781 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1782 QualType ResQT; 1783 if (OldReturnType != NewReturnType) { 1784 if (NewReturnType->isObjCObjectPointerType() 1785 && OldReturnType->isObjCObjectPointerType()) 1786 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1787 if (ResQT.isNull()) { 1788 if (New->isCXXClassMember() && New->isOutOfLine()) 1789 Diag(New->getLocation(), 1790 diag::err_member_def_does_not_match_ret_type) << New; 1791 else 1792 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1793 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1794 return true; 1795 } 1796 else 1797 NewQType = ResQT; 1798 } 1799 1800 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1801 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1802 if (OldMethod && NewMethod) { 1803 // Preserve triviality. 1804 NewMethod->setTrivial(OldMethod->isTrivial()); 1805 1806 // MSVC allows explicit template specialization at class scope: 1807 // 2 CXMethodDecls referring to the same function will be injected. 1808 // We don't want a redeclartion error. 1809 bool IsClassScopeExplicitSpecialization = 1810 OldMethod->isFunctionTemplateSpecialization() && 1811 NewMethod->isFunctionTemplateSpecialization(); 1812 bool isFriend = NewMethod->getFriendObjectKind(); 1813 1814 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1815 !IsClassScopeExplicitSpecialization) { 1816 // -- Member function declarations with the same name and the 1817 // same parameter types cannot be overloaded if any of them 1818 // is a static member function declaration. 1819 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1820 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1821 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1822 return true; 1823 } 1824 1825 // C++ [class.mem]p1: 1826 // [...] A member shall not be declared twice in the 1827 // member-specification, except that a nested class or member 1828 // class template can be declared and then later defined. 1829 unsigned NewDiag; 1830 if (isa<CXXConstructorDecl>(OldMethod)) 1831 NewDiag = diag::err_constructor_redeclared; 1832 else if (isa<CXXDestructorDecl>(NewMethod)) 1833 NewDiag = diag::err_destructor_redeclared; 1834 else if (isa<CXXConversionDecl>(NewMethod)) 1835 NewDiag = diag::err_conv_function_redeclared; 1836 else 1837 NewDiag = diag::err_member_redeclared; 1838 1839 Diag(New->getLocation(), NewDiag); 1840 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1841 1842 // Complain if this is an explicit declaration of a special 1843 // member that was initially declared implicitly. 1844 // 1845 // As an exception, it's okay to befriend such methods in order 1846 // to permit the implicit constructor/destructor/operator calls. 1847 } else if (OldMethod->isImplicit()) { 1848 if (isFriend) { 1849 NewMethod->setImplicit(); 1850 } else { 1851 Diag(NewMethod->getLocation(), 1852 diag::err_definition_of_implicitly_declared_member) 1853 << New << getSpecialMember(OldMethod); 1854 return true; 1855 } 1856 } else if (OldMethod->isExplicitlyDefaulted()) { 1857 Diag(NewMethod->getLocation(), 1858 diag::err_definition_of_explicitly_defaulted_member) 1859 << getSpecialMember(OldMethod); 1860 return true; 1861 } 1862 } 1863 1864 // (C++98 8.3.5p3): 1865 // All declarations for a function shall agree exactly in both the 1866 // return type and the parameter-type-list. 1867 // We also want to respect all the extended bits except noreturn. 1868 1869 // noreturn should now match unless the old type info didn't have it. 1870 QualType OldQTypeForComparison = OldQType; 1871 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1872 assert(OldQType == QualType(OldType, 0)); 1873 const FunctionType *OldTypeForComparison 1874 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1875 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1876 assert(OldQTypeForComparison.isCanonical()); 1877 } 1878 1879 if (OldQTypeForComparison == NewQType) 1880 return MergeCompatibleFunctionDecls(New, Old); 1881 1882 // Fall through for conflicting redeclarations and redefinitions. 1883 } 1884 1885 // C: Function types need to be compatible, not identical. This handles 1886 // duplicate function decls like "void f(int); void f(enum X);" properly. 1887 if (!getLangOptions().CPlusPlus && 1888 Context.typesAreCompatible(OldQType, NewQType)) { 1889 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1890 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1891 const FunctionProtoType *OldProto = 0; 1892 if (isa<FunctionNoProtoType>(NewFuncType) && 1893 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1894 // The old declaration provided a function prototype, but the 1895 // new declaration does not. Merge in the prototype. 1896 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1897 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1898 OldProto->arg_type_end()); 1899 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1900 ParamTypes.data(), ParamTypes.size(), 1901 OldProto->getExtProtoInfo()); 1902 New->setType(NewQType); 1903 New->setHasInheritedPrototype(); 1904 1905 // Synthesize a parameter for each argument type. 1906 SmallVector<ParmVarDecl*, 16> Params; 1907 for (FunctionProtoType::arg_type_iterator 1908 ParamType = OldProto->arg_type_begin(), 1909 ParamEnd = OldProto->arg_type_end(); 1910 ParamType != ParamEnd; ++ParamType) { 1911 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1912 SourceLocation(), 1913 SourceLocation(), 0, 1914 *ParamType, /*TInfo=*/0, 1915 SC_None, SC_None, 1916 0); 1917 Param->setScopeInfo(0, Params.size()); 1918 Param->setImplicit(); 1919 Params.push_back(Param); 1920 } 1921 1922 New->setParams(Params); 1923 } 1924 1925 return MergeCompatibleFunctionDecls(New, Old); 1926 } 1927 1928 // GNU C permits a K&R definition to follow a prototype declaration 1929 // if the declared types of the parameters in the K&R definition 1930 // match the types in the prototype declaration, even when the 1931 // promoted types of the parameters from the K&R definition differ 1932 // from the types in the prototype. GCC then keeps the types from 1933 // the prototype. 1934 // 1935 // If a variadic prototype is followed by a non-variadic K&R definition, 1936 // the K&R definition becomes variadic. This is sort of an edge case, but 1937 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1938 // C99 6.9.1p8. 1939 if (!getLangOptions().CPlusPlus && 1940 Old->hasPrototype() && !New->hasPrototype() && 1941 New->getType()->getAs<FunctionProtoType>() && 1942 Old->getNumParams() == New->getNumParams()) { 1943 SmallVector<QualType, 16> ArgTypes; 1944 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1945 const FunctionProtoType *OldProto 1946 = Old->getType()->getAs<FunctionProtoType>(); 1947 const FunctionProtoType *NewProto 1948 = New->getType()->getAs<FunctionProtoType>(); 1949 1950 // Determine whether this is the GNU C extension. 1951 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1952 NewProto->getResultType()); 1953 bool LooseCompatible = !MergedReturn.isNull(); 1954 for (unsigned Idx = 0, End = Old->getNumParams(); 1955 LooseCompatible && Idx != End; ++Idx) { 1956 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1957 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1958 if (Context.typesAreCompatible(OldParm->getType(), 1959 NewProto->getArgType(Idx))) { 1960 ArgTypes.push_back(NewParm->getType()); 1961 } else if (Context.typesAreCompatible(OldParm->getType(), 1962 NewParm->getType(), 1963 /*CompareUnqualified=*/true)) { 1964 GNUCompatibleParamWarning Warn 1965 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1966 Warnings.push_back(Warn); 1967 ArgTypes.push_back(NewParm->getType()); 1968 } else 1969 LooseCompatible = false; 1970 } 1971 1972 if (LooseCompatible) { 1973 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1974 Diag(Warnings[Warn].NewParm->getLocation(), 1975 diag::ext_param_promoted_not_compatible_with_prototype) 1976 << Warnings[Warn].PromotedType 1977 << Warnings[Warn].OldParm->getType(); 1978 if (Warnings[Warn].OldParm->getLocation().isValid()) 1979 Diag(Warnings[Warn].OldParm->getLocation(), 1980 diag::note_previous_declaration); 1981 } 1982 1983 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1984 ArgTypes.size(), 1985 OldProto->getExtProtoInfo())); 1986 return MergeCompatibleFunctionDecls(New, Old); 1987 } 1988 1989 // Fall through to diagnose conflicting types. 1990 } 1991 1992 // A function that has already been declared has been redeclared or defined 1993 // with a different type- show appropriate diagnostic 1994 if (unsigned BuiltinID = Old->getBuiltinID()) { 1995 // The user has declared a builtin function with an incompatible 1996 // signature. 1997 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1998 // The function the user is redeclaring is a library-defined 1999 // function like 'malloc' or 'printf'. Warn about the 2000 // redeclaration, then pretend that we don't know about this 2001 // library built-in. 2002 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2003 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2004 << Old << Old->getType(); 2005 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2006 Old->setInvalidDecl(); 2007 return false; 2008 } 2009 2010 PrevDiag = diag::note_previous_builtin_declaration; 2011 } 2012 2013 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2014 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2015 return true; 2016} 2017 2018/// \brief Completes the merge of two function declarations that are 2019/// known to be compatible. 2020/// 2021/// This routine handles the merging of attributes and other 2022/// properties of function declarations form the old declaration to 2023/// the new declaration, once we know that New is in fact a 2024/// redeclaration of Old. 2025/// 2026/// \returns false 2027bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2028 // Merge the attributes 2029 mergeDeclAttributes(New, Old, Context); 2030 2031 // Merge the storage class. 2032 if (Old->getStorageClass() != SC_Extern && 2033 Old->getStorageClass() != SC_None) 2034 New->setStorageClass(Old->getStorageClass()); 2035 2036 // Merge "pure" flag. 2037 if (Old->isPure()) 2038 New->setPure(); 2039 2040 // __module_private__ is propagated to later declarations. 2041 if (Old->isModulePrivate()) 2042 New->setModulePrivate(); 2043 else if (New->isModulePrivate()) 2044 diagnoseModulePrivateRedeclaration(New, Old); 2045 2046 // Merge attributes from the parameters. These can mismatch with K&R 2047 // declarations. 2048 if (New->getNumParams() == Old->getNumParams()) 2049 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2050 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2051 Context); 2052 2053 if (getLangOptions().CPlusPlus) 2054 return MergeCXXFunctionDecl(New, Old); 2055 2056 return false; 2057} 2058 2059 2060void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2061 const ObjCMethodDecl *oldMethod) { 2062 // We don't want to merge unavailable and deprecated attributes 2063 // except from interface to implementation. 2064 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2065 2066 // Merge the attributes. 2067 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2068 2069 // Merge attributes from the parameters. 2070 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2071 for (ObjCMethodDecl::param_iterator 2072 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2073 ni != ne; ++ni, ++oi) 2074 mergeParamDeclAttributes(*ni, *oi, Context); 2075 2076 CheckObjCMethodOverride(newMethod, oldMethod, true); 2077} 2078 2079/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2080/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2081/// emitting diagnostics as appropriate. 2082/// 2083/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2084/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2085/// check them before the initializer is attached. 2086/// 2087void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2088 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2089 return; 2090 2091 QualType MergedT; 2092 if (getLangOptions().CPlusPlus) { 2093 AutoType *AT = New->getType()->getContainedAutoType(); 2094 if (AT && !AT->isDeduced()) { 2095 // We don't know what the new type is until the initializer is attached. 2096 return; 2097 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2098 // These could still be something that needs exception specs checked. 2099 return MergeVarDeclExceptionSpecs(New, Old); 2100 } 2101 // C++ [basic.link]p10: 2102 // [...] the types specified by all declarations referring to a given 2103 // object or function shall be identical, except that declarations for an 2104 // array object can specify array types that differ by the presence or 2105 // absence of a major array bound (8.3.4). 2106 else if (Old->getType()->isIncompleteArrayType() && 2107 New->getType()->isArrayType()) { 2108 CanQual<ArrayType> OldArray 2109 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2110 CanQual<ArrayType> NewArray 2111 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2112 if (OldArray->getElementType() == NewArray->getElementType()) 2113 MergedT = New->getType(); 2114 } else if (Old->getType()->isArrayType() && 2115 New->getType()->isIncompleteArrayType()) { 2116 CanQual<ArrayType> OldArray 2117 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2118 CanQual<ArrayType> NewArray 2119 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2120 if (OldArray->getElementType() == NewArray->getElementType()) 2121 MergedT = Old->getType(); 2122 } else if (New->getType()->isObjCObjectPointerType() 2123 && Old->getType()->isObjCObjectPointerType()) { 2124 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2125 Old->getType()); 2126 } 2127 } else { 2128 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2129 } 2130 if (MergedT.isNull()) { 2131 Diag(New->getLocation(), diag::err_redefinition_different_type) 2132 << New->getDeclName(); 2133 Diag(Old->getLocation(), diag::note_previous_definition); 2134 return New->setInvalidDecl(); 2135 } 2136 New->setType(MergedT); 2137} 2138 2139/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2140/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2141/// situation, merging decls or emitting diagnostics as appropriate. 2142/// 2143/// Tentative definition rules (C99 6.9.2p2) are checked by 2144/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2145/// definitions here, since the initializer hasn't been attached. 2146/// 2147void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2148 // If the new decl is already invalid, don't do any other checking. 2149 if (New->isInvalidDecl()) 2150 return; 2151 2152 // Verify the old decl was also a variable. 2153 VarDecl *Old = 0; 2154 if (!Previous.isSingleResult() || 2155 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2156 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2157 << New->getDeclName(); 2158 Diag(Previous.getRepresentativeDecl()->getLocation(), 2159 diag::note_previous_definition); 2160 return New->setInvalidDecl(); 2161 } 2162 2163 // C++ [class.mem]p1: 2164 // A member shall not be declared twice in the member-specification [...] 2165 // 2166 // Here, we need only consider static data members. 2167 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2168 Diag(New->getLocation(), diag::err_duplicate_member) 2169 << New->getIdentifier(); 2170 Diag(Old->getLocation(), diag::note_previous_declaration); 2171 New->setInvalidDecl(); 2172 } 2173 2174 mergeDeclAttributes(New, Old, Context); 2175 // Warn if an already-declared variable is made a weak_import in a subsequent 2176 // declaration 2177 if (New->getAttr<WeakImportAttr>() && 2178 Old->getStorageClass() == SC_None && 2179 !Old->getAttr<WeakImportAttr>()) { 2180 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2181 Diag(Old->getLocation(), diag::note_previous_definition); 2182 // Remove weak_import attribute on new declaration. 2183 New->dropAttr<WeakImportAttr>(); 2184 } 2185 2186 // Merge the types. 2187 MergeVarDeclTypes(New, Old); 2188 if (New->isInvalidDecl()) 2189 return; 2190 2191 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2192 if (New->getStorageClass() == SC_Static && 2193 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2194 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2195 Diag(Old->getLocation(), diag::note_previous_definition); 2196 return New->setInvalidDecl(); 2197 } 2198 // C99 6.2.2p4: 2199 // For an identifier declared with the storage-class specifier 2200 // extern in a scope in which a prior declaration of that 2201 // identifier is visible,23) if the prior declaration specifies 2202 // internal or external linkage, the linkage of the identifier at 2203 // the later declaration is the same as the linkage specified at 2204 // the prior declaration. If no prior declaration is visible, or 2205 // if the prior declaration specifies no linkage, then the 2206 // identifier has external linkage. 2207 if (New->hasExternalStorage() && Old->hasLinkage()) 2208 /* Okay */; 2209 else if (New->getStorageClass() != SC_Static && 2210 Old->getStorageClass() == SC_Static) { 2211 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2212 Diag(Old->getLocation(), diag::note_previous_definition); 2213 return New->setInvalidDecl(); 2214 } 2215 2216 // Check if extern is followed by non-extern and vice-versa. 2217 if (New->hasExternalStorage() && 2218 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2219 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2220 Diag(Old->getLocation(), diag::note_previous_definition); 2221 return New->setInvalidDecl(); 2222 } 2223 if (Old->hasExternalStorage() && 2224 !New->hasLinkage() && New->isLocalVarDecl()) { 2225 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2226 Diag(Old->getLocation(), diag::note_previous_definition); 2227 return New->setInvalidDecl(); 2228 } 2229 2230 // __module_private__ is propagated to later declarations. 2231 if (Old->isModulePrivate()) 2232 New->setModulePrivate(); 2233 else if (New->isModulePrivate()) 2234 diagnoseModulePrivateRedeclaration(New, Old); 2235 2236 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2237 2238 // FIXME: The test for external storage here seems wrong? We still 2239 // need to check for mismatches. 2240 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2241 // Don't complain about out-of-line definitions of static members. 2242 !(Old->getLexicalDeclContext()->isRecord() && 2243 !New->getLexicalDeclContext()->isRecord())) { 2244 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2245 Diag(Old->getLocation(), diag::note_previous_definition); 2246 return New->setInvalidDecl(); 2247 } 2248 2249 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2250 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2251 Diag(Old->getLocation(), diag::note_previous_definition); 2252 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2253 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2254 Diag(Old->getLocation(), diag::note_previous_definition); 2255 } 2256 2257 // C++ doesn't have tentative definitions, so go right ahead and check here. 2258 const VarDecl *Def; 2259 if (getLangOptions().CPlusPlus && 2260 New->isThisDeclarationADefinition() == VarDecl::Definition && 2261 (Def = Old->getDefinition())) { 2262 Diag(New->getLocation(), diag::err_redefinition) 2263 << New->getDeclName(); 2264 Diag(Def->getLocation(), diag::note_previous_definition); 2265 New->setInvalidDecl(); 2266 return; 2267 } 2268 // c99 6.2.2 P4. 2269 // For an identifier declared with the storage-class specifier extern in a 2270 // scope in which a prior declaration of that identifier is visible, if 2271 // the prior declaration specifies internal or external linkage, the linkage 2272 // of the identifier at the later declaration is the same as the linkage 2273 // specified at the prior declaration. 2274 // FIXME. revisit this code. 2275 if (New->hasExternalStorage() && 2276 Old->getLinkage() == InternalLinkage && 2277 New->getDeclContext() == Old->getDeclContext()) 2278 New->setStorageClass(Old->getStorageClass()); 2279 2280 // Keep a chain of previous declarations. 2281 New->setPreviousDeclaration(Old); 2282 2283 // Inherit access appropriately. 2284 New->setAccess(Old->getAccess()); 2285} 2286 2287/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2288/// no declarator (e.g. "struct foo;") is parsed. 2289Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2290 DeclSpec &DS) { 2291 return ParsedFreeStandingDeclSpec(S, AS, DS, 2292 MultiTemplateParamsArg(*this, 0, 0)); 2293} 2294 2295/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2296/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2297/// parameters to cope with template friend declarations. 2298Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2299 DeclSpec &DS, 2300 MultiTemplateParamsArg TemplateParams) { 2301 Decl *TagD = 0; 2302 TagDecl *Tag = 0; 2303 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2304 DS.getTypeSpecType() == DeclSpec::TST_struct || 2305 DS.getTypeSpecType() == DeclSpec::TST_union || 2306 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2307 TagD = DS.getRepAsDecl(); 2308 2309 if (!TagD) // We probably had an error 2310 return 0; 2311 2312 // Note that the above type specs guarantee that the 2313 // type rep is a Decl, whereas in many of the others 2314 // it's a Type. 2315 if (isa<TagDecl>(TagD)) 2316 Tag = cast<TagDecl>(TagD); 2317 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2318 Tag = CTD->getTemplatedDecl(); 2319 } 2320 2321 if (Tag) 2322 Tag->setFreeStanding(); 2323 2324 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2325 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2326 // or incomplete types shall not be restrict-qualified." 2327 if (TypeQuals & DeclSpec::TQ_restrict) 2328 Diag(DS.getRestrictSpecLoc(), 2329 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2330 << DS.getSourceRange(); 2331 } 2332 2333 if (DS.isConstexprSpecified()) { 2334 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2335 // and definitions of functions and variables. 2336 if (Tag) 2337 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2338 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2339 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2340 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2341 else 2342 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2343 // Don't emit warnings after this error. 2344 return TagD; 2345 } 2346 2347 if (DS.isFriendSpecified()) { 2348 // If we're dealing with a decl but not a TagDecl, assume that 2349 // whatever routines created it handled the friendship aspect. 2350 if (TagD && !Tag) 2351 return 0; 2352 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2353 } 2354 2355 // Track whether we warned about the fact that there aren't any 2356 // declarators. 2357 bool emittedWarning = false; 2358 2359 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2360 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2361 2362 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2363 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2364 if (getLangOptions().CPlusPlus || 2365 Record->getDeclContext()->isRecord()) 2366 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2367 2368 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2369 << DS.getSourceRange(); 2370 emittedWarning = true; 2371 } 2372 } 2373 2374 // Check for Microsoft C extension: anonymous struct. 2375 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2376 CurContext->isRecord() && 2377 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2378 // Handle 2 kinds of anonymous struct: 2379 // struct STRUCT; 2380 // and 2381 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2382 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2383 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2384 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2385 DS.getRepAsType().get()->isStructureType())) { 2386 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2387 << DS.getSourceRange(); 2388 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2389 } 2390 } 2391 2392 if (getLangOptions().CPlusPlus && 2393 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2394 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2395 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2396 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2397 Diag(Enum->getLocation(), diag::ext_no_declarators) 2398 << DS.getSourceRange(); 2399 emittedWarning = true; 2400 } 2401 2402 // Skip all the checks below if we have a type error. 2403 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2404 2405 if (!DS.isMissingDeclaratorOk()) { 2406 // Warn about typedefs of enums without names, since this is an 2407 // extension in both Microsoft and GNU. 2408 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2409 Tag && isa<EnumDecl>(Tag)) { 2410 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2411 << DS.getSourceRange(); 2412 return Tag; 2413 } 2414 2415 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2416 << DS.getSourceRange(); 2417 emittedWarning = true; 2418 } 2419 2420 // We're going to complain about a bunch of spurious specifiers; 2421 // only do this if we're declaring a tag, because otherwise we 2422 // should be getting diag::ext_no_declarators. 2423 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2424 return TagD; 2425 2426 // Note that a linkage-specification sets a storage class, but 2427 // 'extern "C" struct foo;' is actually valid and not theoretically 2428 // useless. 2429 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2430 if (!DS.isExternInLinkageSpec()) 2431 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2432 << DeclSpec::getSpecifierName(scs); 2433 2434 if (DS.isThreadSpecified()) 2435 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2436 if (DS.getTypeQualifiers()) { 2437 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2438 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2439 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2440 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2441 // Restrict is covered above. 2442 } 2443 if (DS.isInlineSpecified()) 2444 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2445 if (DS.isVirtualSpecified()) 2446 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2447 if (DS.isExplicitSpecified()) 2448 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2449 2450 if (DS.isModulePrivateSpecified() && 2451 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2452 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2453 << Tag->getTagKind() 2454 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2455 2456 // FIXME: Warn on useless attributes 2457 2458 return TagD; 2459} 2460 2461/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2462/// builds a statement for it and returns it so it is evaluated. 2463StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2464 StmtResult R; 2465 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2466 Expr *Exp = DS.getRepAsExpr(); 2467 QualType Ty = Exp->getType(); 2468 if (Ty->isPointerType()) { 2469 do 2470 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2471 while (Ty->isPointerType()); 2472 } 2473 if (Ty->isVariableArrayType()) { 2474 R = ActOnExprStmt(MakeFullExpr(Exp)); 2475 } 2476 } 2477 return R; 2478} 2479 2480/// We are trying to inject an anonymous member into the given scope; 2481/// check if there's an existing declaration that can't be overloaded. 2482/// 2483/// \return true if this is a forbidden redeclaration 2484static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2485 Scope *S, 2486 DeclContext *Owner, 2487 DeclarationName Name, 2488 SourceLocation NameLoc, 2489 unsigned diagnostic) { 2490 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2491 Sema::ForRedeclaration); 2492 if (!SemaRef.LookupName(R, S)) return false; 2493 2494 if (R.getAsSingle<TagDecl>()) 2495 return false; 2496 2497 // Pick a representative declaration. 2498 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2499 assert(PrevDecl && "Expected a non-null Decl"); 2500 2501 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2502 return false; 2503 2504 SemaRef.Diag(NameLoc, diagnostic) << Name; 2505 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2506 2507 return true; 2508} 2509 2510/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2511/// anonymous struct or union AnonRecord into the owning context Owner 2512/// and scope S. This routine will be invoked just after we realize 2513/// that an unnamed union or struct is actually an anonymous union or 2514/// struct, e.g., 2515/// 2516/// @code 2517/// union { 2518/// int i; 2519/// float f; 2520/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2521/// // f into the surrounding scope.x 2522/// @endcode 2523/// 2524/// This routine is recursive, injecting the names of nested anonymous 2525/// structs/unions into the owning context and scope as well. 2526static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2527 DeclContext *Owner, 2528 RecordDecl *AnonRecord, 2529 AccessSpecifier AS, 2530 SmallVector<NamedDecl*, 2> &Chaining, 2531 bool MSAnonStruct) { 2532 unsigned diagKind 2533 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2534 : diag::err_anonymous_struct_member_redecl; 2535 2536 bool Invalid = false; 2537 2538 // Look every FieldDecl and IndirectFieldDecl with a name. 2539 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2540 DEnd = AnonRecord->decls_end(); 2541 D != DEnd; ++D) { 2542 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2543 cast<NamedDecl>(*D)->getDeclName()) { 2544 ValueDecl *VD = cast<ValueDecl>(*D); 2545 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2546 VD->getLocation(), diagKind)) { 2547 // C++ [class.union]p2: 2548 // The names of the members of an anonymous union shall be 2549 // distinct from the names of any other entity in the 2550 // scope in which the anonymous union is declared. 2551 Invalid = true; 2552 } else { 2553 // C++ [class.union]p2: 2554 // For the purpose of name lookup, after the anonymous union 2555 // definition, the members of the anonymous union are 2556 // considered to have been defined in the scope in which the 2557 // anonymous union is declared. 2558 unsigned OldChainingSize = Chaining.size(); 2559 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2560 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2561 PE = IF->chain_end(); PI != PE; ++PI) 2562 Chaining.push_back(*PI); 2563 else 2564 Chaining.push_back(VD); 2565 2566 assert(Chaining.size() >= 2); 2567 NamedDecl **NamedChain = 2568 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2569 for (unsigned i = 0; i < Chaining.size(); i++) 2570 NamedChain[i] = Chaining[i]; 2571 2572 IndirectFieldDecl* IndirectField = 2573 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2574 VD->getIdentifier(), VD->getType(), 2575 NamedChain, Chaining.size()); 2576 2577 IndirectField->setAccess(AS); 2578 IndirectField->setImplicit(); 2579 SemaRef.PushOnScopeChains(IndirectField, S); 2580 2581 // That includes picking up the appropriate access specifier. 2582 if (AS != AS_none) IndirectField->setAccess(AS); 2583 2584 Chaining.resize(OldChainingSize); 2585 } 2586 } 2587 } 2588 2589 return Invalid; 2590} 2591 2592/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2593/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2594/// illegal input values are mapped to SC_None. 2595static StorageClass 2596StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2597 switch (StorageClassSpec) { 2598 case DeclSpec::SCS_unspecified: return SC_None; 2599 case DeclSpec::SCS_extern: return SC_Extern; 2600 case DeclSpec::SCS_static: return SC_Static; 2601 case DeclSpec::SCS_auto: return SC_Auto; 2602 case DeclSpec::SCS_register: return SC_Register; 2603 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2604 // Illegal SCSs map to None: error reporting is up to the caller. 2605 case DeclSpec::SCS_mutable: // Fall through. 2606 case DeclSpec::SCS_typedef: return SC_None; 2607 } 2608 llvm_unreachable("unknown storage class specifier"); 2609} 2610 2611/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2612/// a StorageClass. Any error reporting is up to the caller: 2613/// illegal input values are mapped to SC_None. 2614static StorageClass 2615StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2616 switch (StorageClassSpec) { 2617 case DeclSpec::SCS_unspecified: return SC_None; 2618 case DeclSpec::SCS_extern: return SC_Extern; 2619 case DeclSpec::SCS_static: return SC_Static; 2620 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2621 // Illegal SCSs map to None: error reporting is up to the caller. 2622 case DeclSpec::SCS_auto: // Fall through. 2623 case DeclSpec::SCS_mutable: // Fall through. 2624 case DeclSpec::SCS_register: // Fall through. 2625 case DeclSpec::SCS_typedef: return SC_None; 2626 } 2627 llvm_unreachable("unknown storage class specifier"); 2628} 2629 2630/// BuildAnonymousStructOrUnion - Handle the declaration of an 2631/// anonymous structure or union. Anonymous unions are a C++ feature 2632/// (C++ [class.union]) and a GNU C extension; anonymous structures 2633/// are a GNU C and GNU C++ extension. 2634Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2635 AccessSpecifier AS, 2636 RecordDecl *Record) { 2637 DeclContext *Owner = Record->getDeclContext(); 2638 2639 // Diagnose whether this anonymous struct/union is an extension. 2640 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2641 Diag(Record->getLocation(), diag::ext_anonymous_union); 2642 else if (!Record->isUnion()) 2643 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2644 2645 // C and C++ require different kinds of checks for anonymous 2646 // structs/unions. 2647 bool Invalid = false; 2648 if (getLangOptions().CPlusPlus) { 2649 const char* PrevSpec = 0; 2650 unsigned DiagID; 2651 if (Record->isUnion()) { 2652 // C++ [class.union]p6: 2653 // Anonymous unions declared in a named namespace or in the 2654 // global namespace shall be declared static. 2655 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2656 (isa<TranslationUnitDecl>(Owner) || 2657 (isa<NamespaceDecl>(Owner) && 2658 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2659 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2660 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2661 2662 // Recover by adding 'static'. 2663 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2664 PrevSpec, DiagID); 2665 } 2666 // C++ [class.union]p6: 2667 // A storage class is not allowed in a declaration of an 2668 // anonymous union in a class scope. 2669 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2670 isa<RecordDecl>(Owner)) { 2671 Diag(DS.getStorageClassSpecLoc(), 2672 diag::err_anonymous_union_with_storage_spec) 2673 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2674 2675 // Recover by removing the storage specifier. 2676 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2677 SourceLocation(), 2678 PrevSpec, DiagID); 2679 } 2680 } 2681 2682 // Ignore const/volatile/restrict qualifiers. 2683 if (DS.getTypeQualifiers()) { 2684 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2685 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2686 << Record->isUnion() << 0 2687 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2688 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2689 Diag(DS.getVolatileSpecLoc(), 2690 diag::ext_anonymous_struct_union_qualified) 2691 << Record->isUnion() << 1 2692 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2693 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2694 Diag(DS.getRestrictSpecLoc(), 2695 diag::ext_anonymous_struct_union_qualified) 2696 << Record->isUnion() << 2 2697 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2698 2699 DS.ClearTypeQualifiers(); 2700 } 2701 2702 // C++ [class.union]p2: 2703 // The member-specification of an anonymous union shall only 2704 // define non-static data members. [Note: nested types and 2705 // functions cannot be declared within an anonymous union. ] 2706 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2707 MemEnd = Record->decls_end(); 2708 Mem != MemEnd; ++Mem) { 2709 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2710 // C++ [class.union]p3: 2711 // An anonymous union shall not have private or protected 2712 // members (clause 11). 2713 assert(FD->getAccess() != AS_none); 2714 if (FD->getAccess() != AS_public) { 2715 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2716 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2717 Invalid = true; 2718 } 2719 2720 // C++ [class.union]p1 2721 // An object of a class with a non-trivial constructor, a non-trivial 2722 // copy constructor, a non-trivial destructor, or a non-trivial copy 2723 // assignment operator cannot be a member of a union, nor can an 2724 // array of such objects. 2725 if (CheckNontrivialField(FD)) 2726 Invalid = true; 2727 } else if ((*Mem)->isImplicit()) { 2728 // Any implicit members are fine. 2729 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2730 // This is a type that showed up in an 2731 // elaborated-type-specifier inside the anonymous struct or 2732 // union, but which actually declares a type outside of the 2733 // anonymous struct or union. It's okay. 2734 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2735 if (!MemRecord->isAnonymousStructOrUnion() && 2736 MemRecord->getDeclName()) { 2737 // Visual C++ allows type definition in anonymous struct or union. 2738 if (getLangOptions().MicrosoftExt) 2739 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2740 << (int)Record->isUnion(); 2741 else { 2742 // This is a nested type declaration. 2743 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2744 << (int)Record->isUnion(); 2745 Invalid = true; 2746 } 2747 } 2748 } else if (isa<AccessSpecDecl>(*Mem)) { 2749 // Any access specifier is fine. 2750 } else { 2751 // We have something that isn't a non-static data 2752 // member. Complain about it. 2753 unsigned DK = diag::err_anonymous_record_bad_member; 2754 if (isa<TypeDecl>(*Mem)) 2755 DK = diag::err_anonymous_record_with_type; 2756 else if (isa<FunctionDecl>(*Mem)) 2757 DK = diag::err_anonymous_record_with_function; 2758 else if (isa<VarDecl>(*Mem)) 2759 DK = diag::err_anonymous_record_with_static; 2760 2761 // Visual C++ allows type definition in anonymous struct or union. 2762 if (getLangOptions().MicrosoftExt && 2763 DK == diag::err_anonymous_record_with_type) 2764 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2765 << (int)Record->isUnion(); 2766 else { 2767 Diag((*Mem)->getLocation(), DK) 2768 << (int)Record->isUnion(); 2769 Invalid = true; 2770 } 2771 } 2772 } 2773 } 2774 2775 if (!Record->isUnion() && !Owner->isRecord()) { 2776 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2777 << (int)getLangOptions().CPlusPlus; 2778 Invalid = true; 2779 } 2780 2781 // Mock up a declarator. 2782 Declarator Dc(DS, Declarator::MemberContext); 2783 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2784 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2785 2786 // Create a declaration for this anonymous struct/union. 2787 NamedDecl *Anon = 0; 2788 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2789 Anon = FieldDecl::Create(Context, OwningClass, 2790 DS.getSourceRange().getBegin(), 2791 Record->getLocation(), 2792 /*IdentifierInfo=*/0, 2793 Context.getTypeDeclType(Record), 2794 TInfo, 2795 /*BitWidth=*/0, /*Mutable=*/false, 2796 /*HasInit=*/false); 2797 Anon->setAccess(AS); 2798 if (getLangOptions().CPlusPlus) 2799 FieldCollector->Add(cast<FieldDecl>(Anon)); 2800 } else { 2801 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2802 assert(SCSpec != DeclSpec::SCS_typedef && 2803 "Parser allowed 'typedef' as storage class VarDecl."); 2804 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2805 if (SCSpec == DeclSpec::SCS_mutable) { 2806 // mutable can only appear on non-static class members, so it's always 2807 // an error here 2808 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2809 Invalid = true; 2810 SC = SC_None; 2811 } 2812 SCSpec = DS.getStorageClassSpecAsWritten(); 2813 VarDecl::StorageClass SCAsWritten 2814 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2815 2816 Anon = VarDecl::Create(Context, Owner, 2817 DS.getSourceRange().getBegin(), 2818 Record->getLocation(), /*IdentifierInfo=*/0, 2819 Context.getTypeDeclType(Record), 2820 TInfo, SC, SCAsWritten); 2821 2822 // Default-initialize the implicit variable. This initialization will be 2823 // trivial in almost all cases, except if a union member has an in-class 2824 // initializer: 2825 // union { int n = 0; }; 2826 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2827 } 2828 Anon->setImplicit(); 2829 2830 // Add the anonymous struct/union object to the current 2831 // context. We'll be referencing this object when we refer to one of 2832 // its members. 2833 Owner->addDecl(Anon); 2834 2835 // Inject the members of the anonymous struct/union into the owning 2836 // context and into the identifier resolver chain for name lookup 2837 // purposes. 2838 SmallVector<NamedDecl*, 2> Chain; 2839 Chain.push_back(Anon); 2840 2841 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2842 Chain, false)) 2843 Invalid = true; 2844 2845 // Mark this as an anonymous struct/union type. Note that we do not 2846 // do this until after we have already checked and injected the 2847 // members of this anonymous struct/union type, because otherwise 2848 // the members could be injected twice: once by DeclContext when it 2849 // builds its lookup table, and once by 2850 // InjectAnonymousStructOrUnionMembers. 2851 Record->setAnonymousStructOrUnion(true); 2852 2853 if (Invalid) 2854 Anon->setInvalidDecl(); 2855 2856 return Anon; 2857} 2858 2859/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2860/// Microsoft C anonymous structure. 2861/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2862/// Example: 2863/// 2864/// struct A { int a; }; 2865/// struct B { struct A; int b; }; 2866/// 2867/// void foo() { 2868/// B var; 2869/// var.a = 3; 2870/// } 2871/// 2872Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2873 RecordDecl *Record) { 2874 2875 // If there is no Record, get the record via the typedef. 2876 if (!Record) 2877 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2878 2879 // Mock up a declarator. 2880 Declarator Dc(DS, Declarator::TypeNameContext); 2881 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2882 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2883 2884 // Create a declaration for this anonymous struct. 2885 NamedDecl* Anon = FieldDecl::Create(Context, 2886 cast<RecordDecl>(CurContext), 2887 DS.getSourceRange().getBegin(), 2888 DS.getSourceRange().getBegin(), 2889 /*IdentifierInfo=*/0, 2890 Context.getTypeDeclType(Record), 2891 TInfo, 2892 /*BitWidth=*/0, /*Mutable=*/false, 2893 /*HasInit=*/false); 2894 Anon->setImplicit(); 2895 2896 // Add the anonymous struct object to the current context. 2897 CurContext->addDecl(Anon); 2898 2899 // Inject the members of the anonymous struct into the current 2900 // context and into the identifier resolver chain for name lookup 2901 // purposes. 2902 SmallVector<NamedDecl*, 2> Chain; 2903 Chain.push_back(Anon); 2904 2905 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2906 Record->getDefinition(), 2907 AS_none, Chain, true)) 2908 Anon->setInvalidDecl(); 2909 2910 return Anon; 2911} 2912 2913/// GetNameForDeclarator - Determine the full declaration name for the 2914/// given Declarator. 2915DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2916 return GetNameFromUnqualifiedId(D.getName()); 2917} 2918 2919/// \brief Retrieves the declaration name from a parsed unqualified-id. 2920DeclarationNameInfo 2921Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2922 DeclarationNameInfo NameInfo; 2923 NameInfo.setLoc(Name.StartLocation); 2924 2925 switch (Name.getKind()) { 2926 2927 case UnqualifiedId::IK_ImplicitSelfParam: 2928 case UnqualifiedId::IK_Identifier: 2929 NameInfo.setName(Name.Identifier); 2930 NameInfo.setLoc(Name.StartLocation); 2931 return NameInfo; 2932 2933 case UnqualifiedId::IK_OperatorFunctionId: 2934 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2935 Name.OperatorFunctionId.Operator)); 2936 NameInfo.setLoc(Name.StartLocation); 2937 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2938 = Name.OperatorFunctionId.SymbolLocations[0]; 2939 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2940 = Name.EndLocation.getRawEncoding(); 2941 return NameInfo; 2942 2943 case UnqualifiedId::IK_LiteralOperatorId: 2944 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2945 Name.Identifier)); 2946 NameInfo.setLoc(Name.StartLocation); 2947 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2948 return NameInfo; 2949 2950 case UnqualifiedId::IK_ConversionFunctionId: { 2951 TypeSourceInfo *TInfo; 2952 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2953 if (Ty.isNull()) 2954 return DeclarationNameInfo(); 2955 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2956 Context.getCanonicalType(Ty))); 2957 NameInfo.setLoc(Name.StartLocation); 2958 NameInfo.setNamedTypeInfo(TInfo); 2959 return NameInfo; 2960 } 2961 2962 case UnqualifiedId::IK_ConstructorName: { 2963 TypeSourceInfo *TInfo; 2964 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2965 if (Ty.isNull()) 2966 return DeclarationNameInfo(); 2967 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2968 Context.getCanonicalType(Ty))); 2969 NameInfo.setLoc(Name.StartLocation); 2970 NameInfo.setNamedTypeInfo(TInfo); 2971 return NameInfo; 2972 } 2973 2974 case UnqualifiedId::IK_ConstructorTemplateId: { 2975 // In well-formed code, we can only have a constructor 2976 // template-id that refers to the current context, so go there 2977 // to find the actual type being constructed. 2978 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2979 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2980 return DeclarationNameInfo(); 2981 2982 // Determine the type of the class being constructed. 2983 QualType CurClassType = Context.getTypeDeclType(CurClass); 2984 2985 // FIXME: Check two things: that the template-id names the same type as 2986 // CurClassType, and that the template-id does not occur when the name 2987 // was qualified. 2988 2989 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2990 Context.getCanonicalType(CurClassType))); 2991 NameInfo.setLoc(Name.StartLocation); 2992 // FIXME: should we retrieve TypeSourceInfo? 2993 NameInfo.setNamedTypeInfo(0); 2994 return NameInfo; 2995 } 2996 2997 case UnqualifiedId::IK_DestructorName: { 2998 TypeSourceInfo *TInfo; 2999 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3000 if (Ty.isNull()) 3001 return DeclarationNameInfo(); 3002 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3003 Context.getCanonicalType(Ty))); 3004 NameInfo.setLoc(Name.StartLocation); 3005 NameInfo.setNamedTypeInfo(TInfo); 3006 return NameInfo; 3007 } 3008 3009 case UnqualifiedId::IK_TemplateId: { 3010 TemplateName TName = Name.TemplateId->Template.get(); 3011 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3012 return Context.getNameForTemplate(TName, TNameLoc); 3013 } 3014 3015 } // switch (Name.getKind()) 3016 3017 llvm_unreachable("Unknown name kind"); 3018} 3019 3020static QualType getCoreType(QualType Ty) { 3021 do { 3022 if (Ty->isPointerType() || Ty->isReferenceType()) 3023 Ty = Ty->getPointeeType(); 3024 else if (Ty->isArrayType()) 3025 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3026 else 3027 return Ty.withoutLocalFastQualifiers(); 3028 } while (true); 3029} 3030 3031/// hasSimilarParameters - Determine whether the C++ functions Declaration 3032/// and Definition have "nearly" matching parameters. This heuristic is 3033/// used to improve diagnostics in the case where an out-of-line function 3034/// definition doesn't match any declaration within the class or namespace. 3035/// Also sets Params to the list of indices to the parameters that differ 3036/// between the declaration and the definition. If hasSimilarParameters 3037/// returns true and Params is empty, then all of the parameters match. 3038static bool hasSimilarParameters(ASTContext &Context, 3039 FunctionDecl *Declaration, 3040 FunctionDecl *Definition, 3041 llvm::SmallVectorImpl<unsigned> &Params) { 3042 Params.clear(); 3043 if (Declaration->param_size() != Definition->param_size()) 3044 return false; 3045 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3046 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3047 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3048 3049 // The parameter types are identical 3050 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3051 continue; 3052 3053 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3054 QualType DefParamBaseTy = getCoreType(DefParamTy); 3055 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3056 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3057 3058 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3059 (DeclTyName && DeclTyName == DefTyName)) 3060 Params.push_back(Idx); 3061 else // The two parameters aren't even close 3062 return false; 3063 } 3064 3065 return true; 3066} 3067 3068/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3069/// declarator needs to be rebuilt in the current instantiation. 3070/// Any bits of declarator which appear before the name are valid for 3071/// consideration here. That's specifically the type in the decl spec 3072/// and the base type in any member-pointer chunks. 3073static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3074 DeclarationName Name) { 3075 // The types we specifically need to rebuild are: 3076 // - typenames, typeofs, and decltypes 3077 // - types which will become injected class names 3078 // Of course, we also need to rebuild any type referencing such a 3079 // type. It's safest to just say "dependent", but we call out a 3080 // few cases here. 3081 3082 DeclSpec &DS = D.getMutableDeclSpec(); 3083 switch (DS.getTypeSpecType()) { 3084 case DeclSpec::TST_typename: 3085 case DeclSpec::TST_typeofType: 3086 case DeclSpec::TST_decltype: 3087 case DeclSpec::TST_underlyingType: 3088 case DeclSpec::TST_atomic: { 3089 // Grab the type from the parser. 3090 TypeSourceInfo *TSI = 0; 3091 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3092 if (T.isNull() || !T->isDependentType()) break; 3093 3094 // Make sure there's a type source info. This isn't really much 3095 // of a waste; most dependent types should have type source info 3096 // attached already. 3097 if (!TSI) 3098 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3099 3100 // Rebuild the type in the current instantiation. 3101 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3102 if (!TSI) return true; 3103 3104 // Store the new type back in the decl spec. 3105 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3106 DS.UpdateTypeRep(LocType); 3107 break; 3108 } 3109 3110 case DeclSpec::TST_typeofExpr: { 3111 Expr *E = DS.getRepAsExpr(); 3112 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3113 if (Result.isInvalid()) return true; 3114 DS.UpdateExprRep(Result.get()); 3115 break; 3116 } 3117 3118 default: 3119 // Nothing to do for these decl specs. 3120 break; 3121 } 3122 3123 // It doesn't matter what order we do this in. 3124 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3125 DeclaratorChunk &Chunk = D.getTypeObject(I); 3126 3127 // The only type information in the declarator which can come 3128 // before the declaration name is the base type of a member 3129 // pointer. 3130 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3131 continue; 3132 3133 // Rebuild the scope specifier in-place. 3134 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3135 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3136 return true; 3137 } 3138 3139 return false; 3140} 3141 3142Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3143 D.setFunctionDefinition(false); 3144 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3145} 3146 3147/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3148/// If T is the name of a class, then each of the following shall have a 3149/// name different from T: 3150/// - every static data member of class T; 3151/// - every member function of class T 3152/// - every member of class T that is itself a type; 3153/// \returns true if the declaration name violates these rules. 3154bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3155 DeclarationNameInfo NameInfo) { 3156 DeclarationName Name = NameInfo.getName(); 3157 3158 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3159 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3160 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3161 return true; 3162 } 3163 3164 return false; 3165} 3166 3167Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3168 MultiTemplateParamsArg TemplateParamLists) { 3169 // TODO: consider using NameInfo for diagnostic. 3170 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3171 DeclarationName Name = NameInfo.getName(); 3172 3173 // All of these full declarators require an identifier. If it doesn't have 3174 // one, the ParsedFreeStandingDeclSpec action should be used. 3175 if (!Name) { 3176 if (!D.isInvalidType()) // Reject this if we think it is valid. 3177 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3178 diag::err_declarator_need_ident) 3179 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3180 return 0; 3181 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3182 return 0; 3183 3184 // The scope passed in may not be a decl scope. Zip up the scope tree until 3185 // we find one that is. 3186 while ((S->getFlags() & Scope::DeclScope) == 0 || 3187 (S->getFlags() & Scope::TemplateParamScope) != 0) 3188 S = S->getParent(); 3189 3190 DeclContext *DC = CurContext; 3191 if (D.getCXXScopeSpec().isInvalid()) 3192 D.setInvalidType(); 3193 else if (D.getCXXScopeSpec().isSet()) { 3194 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3195 UPPC_DeclarationQualifier)) 3196 return 0; 3197 3198 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3199 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3200 if (!DC) { 3201 // If we could not compute the declaration context, it's because the 3202 // declaration context is dependent but does not refer to a class, 3203 // class template, or class template partial specialization. Complain 3204 // and return early, to avoid the coming semantic disaster. 3205 Diag(D.getIdentifierLoc(), 3206 diag::err_template_qualified_declarator_no_match) 3207 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3208 << D.getCXXScopeSpec().getRange(); 3209 return 0; 3210 } 3211 bool IsDependentContext = DC->isDependentContext(); 3212 3213 if (!IsDependentContext && 3214 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3215 return 0; 3216 3217 if (isa<CXXRecordDecl>(DC)) { 3218 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3219 Diag(D.getIdentifierLoc(), 3220 diag::err_member_def_undefined_record) 3221 << Name << DC << D.getCXXScopeSpec().getRange(); 3222 D.setInvalidType(); 3223 } else if (isa<CXXRecordDecl>(CurContext) && 3224 !D.getDeclSpec().isFriendSpecified()) { 3225 // The user provided a superfluous scope specifier inside a class 3226 // definition: 3227 // 3228 // class X { 3229 // void X::f(); 3230 // }; 3231 if (CurContext->Equals(DC)) 3232 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3233 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3234 else 3235 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3236 << Name << D.getCXXScopeSpec().getRange(); 3237 3238 // Pretend that this qualifier was not here. 3239 D.getCXXScopeSpec().clear(); 3240 } 3241 } 3242 3243 // Check whether we need to rebuild the type of the given 3244 // declaration in the current instantiation. 3245 if (EnteringContext && IsDependentContext && 3246 TemplateParamLists.size() != 0) { 3247 ContextRAII SavedContext(*this, DC); 3248 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3249 D.setInvalidType(); 3250 } 3251 } 3252 3253 if (DiagnoseClassNameShadow(DC, NameInfo)) 3254 // If this is a typedef, we'll end up spewing multiple diagnostics. 3255 // Just return early; it's safer. 3256 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3257 return 0; 3258 3259 NamedDecl *New; 3260 3261 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3262 QualType R = TInfo->getType(); 3263 3264 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3265 UPPC_DeclarationType)) 3266 D.setInvalidType(); 3267 3268 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3269 ForRedeclaration); 3270 3271 // See if this is a redefinition of a variable in the same scope. 3272 if (!D.getCXXScopeSpec().isSet()) { 3273 bool IsLinkageLookup = false; 3274 3275 // If the declaration we're planning to build will be a function 3276 // or object with linkage, then look for another declaration with 3277 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3278 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3279 /* Do nothing*/; 3280 else if (R->isFunctionType()) { 3281 if (CurContext->isFunctionOrMethod() || 3282 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3283 IsLinkageLookup = true; 3284 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3285 IsLinkageLookup = true; 3286 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3287 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3288 IsLinkageLookup = true; 3289 3290 if (IsLinkageLookup) 3291 Previous.clear(LookupRedeclarationWithLinkage); 3292 3293 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3294 } else { // Something like "int foo::x;" 3295 LookupQualifiedName(Previous, DC); 3296 3297 // Don't consider using declarations as previous declarations for 3298 // out-of-line members. 3299 RemoveUsingDecls(Previous); 3300 3301 // C++ 7.3.1.2p2: 3302 // Members (including explicit specializations of templates) of a named 3303 // namespace can also be defined outside that namespace by explicit 3304 // qualification of the name being defined, provided that the entity being 3305 // defined was already declared in the namespace and the definition appears 3306 // after the point of declaration in a namespace that encloses the 3307 // declarations namespace. 3308 // 3309 // Note that we only check the context at this point. We don't yet 3310 // have enough information to make sure that PrevDecl is actually 3311 // the declaration we want to match. For example, given: 3312 // 3313 // class X { 3314 // void f(); 3315 // void f(float); 3316 // }; 3317 // 3318 // void X::f(int) { } // ill-formed 3319 // 3320 // In this case, PrevDecl will point to the overload set 3321 // containing the two f's declared in X, but neither of them 3322 // matches. 3323 3324 // First check whether we named the global scope. 3325 if (isa<TranslationUnitDecl>(DC)) { 3326 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3327 << Name << D.getCXXScopeSpec().getRange(); 3328 } else { 3329 DeclContext *Cur = CurContext; 3330 while (isa<LinkageSpecDecl>(Cur)) 3331 Cur = Cur->getParent(); 3332 if (!Cur->Encloses(DC)) { 3333 // The qualifying scope doesn't enclose the original declaration. 3334 // Emit diagnostic based on current scope. 3335 SourceLocation L = D.getIdentifierLoc(); 3336 SourceRange R = D.getCXXScopeSpec().getRange(); 3337 if (isa<FunctionDecl>(Cur)) 3338 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3339 else 3340 Diag(L, diag::err_invalid_declarator_scope) 3341 << Name << cast<NamedDecl>(DC) << R; 3342 D.setInvalidType(); 3343 } 3344 } 3345 } 3346 3347 if (Previous.isSingleResult() && 3348 Previous.getFoundDecl()->isTemplateParameter()) { 3349 // Maybe we will complain about the shadowed template parameter. 3350 if (!D.isInvalidType()) 3351 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3352 Previous.getFoundDecl()); 3353 3354 // Just pretend that we didn't see the previous declaration. 3355 Previous.clear(); 3356 } 3357 3358 // In C++, the previous declaration we find might be a tag type 3359 // (class or enum). In this case, the new declaration will hide the 3360 // tag type. Note that this does does not apply if we're declaring a 3361 // typedef (C++ [dcl.typedef]p4). 3362 if (Previous.isSingleTagDecl() && 3363 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3364 Previous.clear(); 3365 3366 bool AddToScope = true; 3367 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3368 if (TemplateParamLists.size()) { 3369 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3370 return 0; 3371 } 3372 3373 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3374 } else if (R->isFunctionType()) { 3375 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3376 move(TemplateParamLists), 3377 AddToScope); 3378 } else { 3379 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3380 move(TemplateParamLists)); 3381 } 3382 3383 if (New == 0) 3384 return 0; 3385 3386 // If this has an identifier and is not an invalid redeclaration or 3387 // function template specialization, add it to the scope stack. 3388 if (New->getDeclName() && AddToScope && 3389 !(D.isRedeclaration() && New->isInvalidDecl())) 3390 PushOnScopeChains(New, S); 3391 3392 return New; 3393} 3394 3395/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3396/// types into constant array types in certain situations which would otherwise 3397/// be errors (for GCC compatibility). 3398static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3399 ASTContext &Context, 3400 bool &SizeIsNegative, 3401 llvm::APSInt &Oversized) { 3402 // This method tries to turn a variable array into a constant 3403 // array even when the size isn't an ICE. This is necessary 3404 // for compatibility with code that depends on gcc's buggy 3405 // constant expression folding, like struct {char x[(int)(char*)2];} 3406 SizeIsNegative = false; 3407 Oversized = 0; 3408 3409 if (T->isDependentType()) 3410 return QualType(); 3411 3412 QualifierCollector Qs; 3413 const Type *Ty = Qs.strip(T); 3414 3415 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3416 QualType Pointee = PTy->getPointeeType(); 3417 QualType FixedType = 3418 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3419 Oversized); 3420 if (FixedType.isNull()) return FixedType; 3421 FixedType = Context.getPointerType(FixedType); 3422 return Qs.apply(Context, FixedType); 3423 } 3424 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3425 QualType Inner = PTy->getInnerType(); 3426 QualType FixedType = 3427 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3428 Oversized); 3429 if (FixedType.isNull()) return FixedType; 3430 FixedType = Context.getParenType(FixedType); 3431 return Qs.apply(Context, FixedType); 3432 } 3433 3434 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3435 if (!VLATy) 3436 return QualType(); 3437 // FIXME: We should probably handle this case 3438 if (VLATy->getElementType()->isVariablyModifiedType()) 3439 return QualType(); 3440 3441 Expr::EvalResult EvalResult; 3442 if (!VLATy->getSizeExpr() || 3443 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3444 !EvalResult.Val.isInt()) 3445 return QualType(); 3446 3447 // Check whether the array size is negative. 3448 llvm::APSInt &Res = EvalResult.Val.getInt(); 3449 if (Res.isSigned() && Res.isNegative()) { 3450 SizeIsNegative = true; 3451 return QualType(); 3452 } 3453 3454 // Check whether the array is too large to be addressed. 3455 unsigned ActiveSizeBits 3456 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3457 Res); 3458 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3459 Oversized = Res; 3460 return QualType(); 3461 } 3462 3463 return Context.getConstantArrayType(VLATy->getElementType(), 3464 Res, ArrayType::Normal, 0); 3465} 3466 3467/// \brief Register the given locally-scoped external C declaration so 3468/// that it can be found later for redeclarations 3469void 3470Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3471 const LookupResult &Previous, 3472 Scope *S) { 3473 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3474 "Decl is not a locally-scoped decl!"); 3475 // Note that we have a locally-scoped external with this name. 3476 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3477 3478 if (!Previous.isSingleResult()) 3479 return; 3480 3481 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3482 3483 // If there was a previous declaration of this variable, it may be 3484 // in our identifier chain. Update the identifier chain with the new 3485 // declaration. 3486 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3487 // The previous declaration was found on the identifer resolver 3488 // chain, so remove it from its scope. 3489 3490 if (S->isDeclScope(PrevDecl)) { 3491 // Special case for redeclarations in the SAME scope. 3492 // Because this declaration is going to be added to the identifier chain 3493 // later, we should temporarily take it OFF the chain. 3494 IdResolver.RemoveDecl(ND); 3495 3496 } else { 3497 // Find the scope for the original declaration. 3498 while (S && !S->isDeclScope(PrevDecl)) 3499 S = S->getParent(); 3500 } 3501 3502 if (S) 3503 S->RemoveDecl(PrevDecl); 3504 } 3505} 3506 3507llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3508Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3509 if (ExternalSource) { 3510 // Load locally-scoped external decls from the external source. 3511 SmallVector<NamedDecl *, 4> Decls; 3512 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3513 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3514 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3515 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3516 if (Pos == LocallyScopedExternalDecls.end()) 3517 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3518 } 3519 } 3520 3521 return LocallyScopedExternalDecls.find(Name); 3522} 3523 3524/// \brief Diagnose function specifiers on a declaration of an identifier that 3525/// does not identify a function. 3526void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3527 // FIXME: We should probably indicate the identifier in question to avoid 3528 // confusion for constructs like "inline int a(), b;" 3529 if (D.getDeclSpec().isInlineSpecified()) 3530 Diag(D.getDeclSpec().getInlineSpecLoc(), 3531 diag::err_inline_non_function); 3532 3533 if (D.getDeclSpec().isVirtualSpecified()) 3534 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3535 diag::err_virtual_non_function); 3536 3537 if (D.getDeclSpec().isExplicitSpecified()) 3538 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3539 diag::err_explicit_non_function); 3540} 3541 3542NamedDecl* 3543Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3544 TypeSourceInfo *TInfo, LookupResult &Previous) { 3545 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3546 if (D.getCXXScopeSpec().isSet()) { 3547 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3548 << D.getCXXScopeSpec().getRange(); 3549 D.setInvalidType(); 3550 // Pretend we didn't see the scope specifier. 3551 DC = CurContext; 3552 Previous.clear(); 3553 } 3554 3555 if (getLangOptions().CPlusPlus) { 3556 // Check that there are no default arguments (C++ only). 3557 CheckExtraCXXDefaultArguments(D); 3558 } 3559 3560 DiagnoseFunctionSpecifiers(D); 3561 3562 if (D.getDeclSpec().isThreadSpecified()) 3563 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3564 if (D.getDeclSpec().isConstexprSpecified()) 3565 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3566 << 1; 3567 3568 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3569 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3570 << D.getName().getSourceRange(); 3571 return 0; 3572 } 3573 3574 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3575 if (!NewTD) return 0; 3576 3577 // Handle attributes prior to checking for duplicates in MergeVarDecl 3578 ProcessDeclAttributes(S, NewTD, D); 3579 3580 CheckTypedefForVariablyModifiedType(S, NewTD); 3581 3582 bool Redeclaration = D.isRedeclaration(); 3583 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3584 D.setRedeclaration(Redeclaration); 3585 return ND; 3586} 3587 3588void 3589Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3590 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3591 // then it shall have block scope. 3592 // Note that variably modified types must be fixed before merging the decl so 3593 // that redeclarations will match. 3594 QualType T = NewTD->getUnderlyingType(); 3595 if (T->isVariablyModifiedType()) { 3596 getCurFunction()->setHasBranchProtectedScope(); 3597 3598 if (S->getFnParent() == 0) { 3599 bool SizeIsNegative; 3600 llvm::APSInt Oversized; 3601 QualType FixedTy = 3602 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3603 Oversized); 3604 if (!FixedTy.isNull()) { 3605 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3606 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3607 } else { 3608 if (SizeIsNegative) 3609 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3610 else if (T->isVariableArrayType()) 3611 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3612 else if (Oversized.getBoolValue()) 3613 Diag(NewTD->getLocation(), diag::err_array_too_large) 3614 << Oversized.toString(10); 3615 else 3616 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3617 NewTD->setInvalidDecl(); 3618 } 3619 } 3620 } 3621} 3622 3623 3624/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3625/// declares a typedef-name, either using the 'typedef' type specifier or via 3626/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3627NamedDecl* 3628Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3629 LookupResult &Previous, bool &Redeclaration) { 3630 // Merge the decl with the existing one if appropriate. If the decl is 3631 // in an outer scope, it isn't the same thing. 3632 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3633 /*ExplicitInstantiationOrSpecialization=*/false); 3634 if (!Previous.empty()) { 3635 Redeclaration = true; 3636 MergeTypedefNameDecl(NewTD, Previous); 3637 } 3638 3639 // If this is the C FILE type, notify the AST context. 3640 if (IdentifierInfo *II = NewTD->getIdentifier()) 3641 if (!NewTD->isInvalidDecl() && 3642 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3643 if (II->isStr("FILE")) 3644 Context.setFILEDecl(NewTD); 3645 else if (II->isStr("jmp_buf")) 3646 Context.setjmp_bufDecl(NewTD); 3647 else if (II->isStr("sigjmp_buf")) 3648 Context.setsigjmp_bufDecl(NewTD); 3649 else if (II->isStr("__builtin_va_list")) 3650 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3651 } 3652 3653 return NewTD; 3654} 3655 3656/// \brief Determines whether the given declaration is an out-of-scope 3657/// previous declaration. 3658/// 3659/// This routine should be invoked when name lookup has found a 3660/// previous declaration (PrevDecl) that is not in the scope where a 3661/// new declaration by the same name is being introduced. If the new 3662/// declaration occurs in a local scope, previous declarations with 3663/// linkage may still be considered previous declarations (C99 3664/// 6.2.2p4-5, C++ [basic.link]p6). 3665/// 3666/// \param PrevDecl the previous declaration found by name 3667/// lookup 3668/// 3669/// \param DC the context in which the new declaration is being 3670/// declared. 3671/// 3672/// \returns true if PrevDecl is an out-of-scope previous declaration 3673/// for a new delcaration with the same name. 3674static bool 3675isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3676 ASTContext &Context) { 3677 if (!PrevDecl) 3678 return false; 3679 3680 if (!PrevDecl->hasLinkage()) 3681 return false; 3682 3683 if (Context.getLangOptions().CPlusPlus) { 3684 // C++ [basic.link]p6: 3685 // If there is a visible declaration of an entity with linkage 3686 // having the same name and type, ignoring entities declared 3687 // outside the innermost enclosing namespace scope, the block 3688 // scope declaration declares that same entity and receives the 3689 // linkage of the previous declaration. 3690 DeclContext *OuterContext = DC->getRedeclContext(); 3691 if (!OuterContext->isFunctionOrMethod()) 3692 // This rule only applies to block-scope declarations. 3693 return false; 3694 3695 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3696 if (PrevOuterContext->isRecord()) 3697 // We found a member function: ignore it. 3698 return false; 3699 3700 // Find the innermost enclosing namespace for the new and 3701 // previous declarations. 3702 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3703 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3704 3705 // The previous declaration is in a different namespace, so it 3706 // isn't the same function. 3707 if (!OuterContext->Equals(PrevOuterContext)) 3708 return false; 3709 } 3710 3711 return true; 3712} 3713 3714static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3715 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3716 if (!SS.isSet()) return; 3717 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3718} 3719 3720bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3721 QualType type = decl->getType(); 3722 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3723 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3724 // Various kinds of declaration aren't allowed to be __autoreleasing. 3725 unsigned kind = -1U; 3726 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3727 if (var->hasAttr<BlocksAttr>()) 3728 kind = 0; // __block 3729 else if (!var->hasLocalStorage()) 3730 kind = 1; // global 3731 } else if (isa<ObjCIvarDecl>(decl)) { 3732 kind = 3; // ivar 3733 } else if (isa<FieldDecl>(decl)) { 3734 kind = 2; // field 3735 } 3736 3737 if (kind != -1U) { 3738 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3739 << kind; 3740 } 3741 } else if (lifetime == Qualifiers::OCL_None) { 3742 // Try to infer lifetime. 3743 if (!type->isObjCLifetimeType()) 3744 return false; 3745 3746 lifetime = type->getObjCARCImplicitLifetime(); 3747 type = Context.getLifetimeQualifiedType(type, lifetime); 3748 decl->setType(type); 3749 } 3750 3751 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3752 // Thread-local variables cannot have lifetime. 3753 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3754 var->isThreadSpecified()) { 3755 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3756 << var->getType(); 3757 return true; 3758 } 3759 } 3760 3761 return false; 3762} 3763 3764NamedDecl* 3765Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3766 TypeSourceInfo *TInfo, LookupResult &Previous, 3767 MultiTemplateParamsArg TemplateParamLists) { 3768 QualType R = TInfo->getType(); 3769 DeclarationName Name = GetNameForDeclarator(D).getName(); 3770 3771 // Check that there are no default arguments (C++ only). 3772 if (getLangOptions().CPlusPlus) 3773 CheckExtraCXXDefaultArguments(D); 3774 3775 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3776 assert(SCSpec != DeclSpec::SCS_typedef && 3777 "Parser allowed 'typedef' as storage class VarDecl."); 3778 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3779 if (SCSpec == DeclSpec::SCS_mutable) { 3780 // mutable can only appear on non-static class members, so it's always 3781 // an error here 3782 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3783 D.setInvalidType(); 3784 SC = SC_None; 3785 } 3786 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3787 VarDecl::StorageClass SCAsWritten 3788 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3789 3790 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3791 if (!II) { 3792 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3793 << Name; 3794 return 0; 3795 } 3796 3797 DiagnoseFunctionSpecifiers(D); 3798 3799 if (!DC->isRecord() && S->getFnParent() == 0) { 3800 // C99 6.9p2: The storage-class specifiers auto and register shall not 3801 // appear in the declaration specifiers in an external declaration. 3802 if (SC == SC_Auto || SC == SC_Register) { 3803 3804 // If this is a register variable with an asm label specified, then this 3805 // is a GNU extension. 3806 if (SC == SC_Register && D.getAsmLabel()) 3807 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3808 else 3809 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3810 D.setInvalidType(); 3811 } 3812 } 3813 3814 if (getLangOptions().OpenCL) { 3815 // Set up the special work-group-local storage class for variables in the 3816 // OpenCL __local address space. 3817 if (R.getAddressSpace() == LangAS::opencl_local) 3818 SC = SC_OpenCLWorkGroupLocal; 3819 } 3820 3821 bool isExplicitSpecialization = false; 3822 VarDecl *NewVD; 3823 if (!getLangOptions().CPlusPlus) { 3824 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3825 D.getIdentifierLoc(), II, 3826 R, TInfo, SC, SCAsWritten); 3827 3828 if (D.isInvalidType()) 3829 NewVD->setInvalidDecl(); 3830 } else { 3831 if (DC->isRecord() && !CurContext->isRecord()) { 3832 // This is an out-of-line definition of a static data member. 3833 if (SC == SC_Static) { 3834 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3835 diag::err_static_out_of_line) 3836 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3837 } else if (SC == SC_None) 3838 SC = SC_Static; 3839 } 3840 if (SC == SC_Static) { 3841 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3842 if (RD->isLocalClass()) 3843 Diag(D.getIdentifierLoc(), 3844 diag::err_static_data_member_not_allowed_in_local_class) 3845 << Name << RD->getDeclName(); 3846 3847 // C++ [class.union]p1: If a union contains a static data member, 3848 // the program is ill-formed. 3849 // 3850 // We also disallow static data members in anonymous structs. 3851 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3852 Diag(D.getIdentifierLoc(), 3853 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3854 << Name << RD->isUnion(); 3855 } 3856 } 3857 3858 // Match up the template parameter lists with the scope specifier, then 3859 // determine whether we have a template or a template specialization. 3860 isExplicitSpecialization = false; 3861 bool Invalid = false; 3862 if (TemplateParameterList *TemplateParams 3863 = MatchTemplateParametersToScopeSpecifier( 3864 D.getDeclSpec().getSourceRange().getBegin(), 3865 D.getIdentifierLoc(), 3866 D.getCXXScopeSpec(), 3867 TemplateParamLists.get(), 3868 TemplateParamLists.size(), 3869 /*never a friend*/ false, 3870 isExplicitSpecialization, 3871 Invalid)) { 3872 if (TemplateParams->size() > 0) { 3873 // There is no such thing as a variable template. 3874 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3875 << II 3876 << SourceRange(TemplateParams->getTemplateLoc(), 3877 TemplateParams->getRAngleLoc()); 3878 return 0; 3879 } else { 3880 // There is an extraneous 'template<>' for this variable. Complain 3881 // about it, but allow the declaration of the variable. 3882 Diag(TemplateParams->getTemplateLoc(), 3883 diag::err_template_variable_noparams) 3884 << II 3885 << SourceRange(TemplateParams->getTemplateLoc(), 3886 TemplateParams->getRAngleLoc()); 3887 } 3888 } 3889 3890 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3891 D.getIdentifierLoc(), II, 3892 R, TInfo, SC, SCAsWritten); 3893 3894 // If this decl has an auto type in need of deduction, make a note of the 3895 // Decl so we can diagnose uses of it in its own initializer. 3896 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3897 R->getContainedAutoType()) 3898 ParsingInitForAutoVars.insert(NewVD); 3899 3900 if (D.isInvalidType() || Invalid) 3901 NewVD->setInvalidDecl(); 3902 3903 SetNestedNameSpecifier(NewVD, D); 3904 3905 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3906 NewVD->setTemplateParameterListsInfo(Context, 3907 TemplateParamLists.size(), 3908 TemplateParamLists.release()); 3909 } 3910 3911 if (D.getDeclSpec().isConstexprSpecified()) { 3912 // FIXME: once we know whether there's an initializer, apply this to 3913 // static data members too. 3914 if (!NewVD->isStaticDataMember() && 3915 !NewVD->isThisDeclarationADefinition()) { 3916 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3917 // of a variable. Suggest replacing it with 'const' if appropriate. 3918 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3919 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3920 // If the declarator is complex, we need to move the keyword to the 3921 // innermost chunk as we switch it from 'constexpr' to 'const'. 3922 int Kind = DeclaratorChunk::Paren; 3923 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3924 Kind = D.getTypeObject(I).Kind; 3925 if (Kind != DeclaratorChunk::Paren) 3926 break; 3927 } 3928 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3929 Kind == DeclaratorChunk::Reference) 3930 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3931 << FixItHint::CreateRemoval(ConstexprRange); 3932 else if (Kind == DeclaratorChunk::Paren) 3933 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3934 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3935 else 3936 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3937 << FixItHint::CreateRemoval(ConstexprRange) 3938 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3939 } else { 3940 NewVD->setConstexpr(true); 3941 } 3942 } 3943 } 3944 3945 // Set the lexical context. If the declarator has a C++ scope specifier, the 3946 // lexical context will be different from the semantic context. 3947 NewVD->setLexicalDeclContext(CurContext); 3948 3949 if (D.getDeclSpec().isThreadSpecified()) { 3950 if (NewVD->hasLocalStorage()) 3951 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3952 else if (!Context.getTargetInfo().isTLSSupported()) 3953 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3954 else 3955 NewVD->setThreadSpecified(true); 3956 } 3957 3958 if (D.getDeclSpec().isModulePrivateSpecified()) { 3959 if (isExplicitSpecialization) 3960 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3961 << 2 3962 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3963 else if (NewVD->hasLocalStorage()) 3964 Diag(NewVD->getLocation(), diag::err_module_private_local) 3965 << 0 << NewVD->getDeclName() 3966 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3967 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3968 else 3969 NewVD->setModulePrivate(); 3970 } 3971 3972 // Handle attributes prior to checking for duplicates in MergeVarDecl 3973 ProcessDeclAttributes(S, NewVD, D); 3974 3975 // In auto-retain/release, infer strong retension for variables of 3976 // retainable type. 3977 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3978 NewVD->setInvalidDecl(); 3979 3980 // Handle GNU asm-label extension (encoded as an attribute). 3981 if (Expr *E = (Expr*)D.getAsmLabel()) { 3982 // The parser guarantees this is a string. 3983 StringLiteral *SE = cast<StringLiteral>(E); 3984 StringRef Label = SE->getString(); 3985 if (S->getFnParent() != 0) { 3986 switch (SC) { 3987 case SC_None: 3988 case SC_Auto: 3989 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3990 break; 3991 case SC_Register: 3992 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3993 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3994 break; 3995 case SC_Static: 3996 case SC_Extern: 3997 case SC_PrivateExtern: 3998 case SC_OpenCLWorkGroupLocal: 3999 break; 4000 } 4001 } 4002 4003 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4004 Context, Label)); 4005 } 4006 4007 // Diagnose shadowed variables before filtering for scope. 4008 if (!D.getCXXScopeSpec().isSet()) 4009 CheckShadow(S, NewVD, Previous); 4010 4011 // Don't consider existing declarations that are in a different 4012 // scope and are out-of-semantic-context declarations (if the new 4013 // declaration has linkage). 4014 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4015 isExplicitSpecialization); 4016 4017 if (!getLangOptions().CPlusPlus) { 4018 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4019 } else { 4020 // Merge the decl with the existing one if appropriate. 4021 if (!Previous.empty()) { 4022 if (Previous.isSingleResult() && 4023 isa<FieldDecl>(Previous.getFoundDecl()) && 4024 D.getCXXScopeSpec().isSet()) { 4025 // The user tried to define a non-static data member 4026 // out-of-line (C++ [dcl.meaning]p1). 4027 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4028 << D.getCXXScopeSpec().getRange(); 4029 Previous.clear(); 4030 NewVD->setInvalidDecl(); 4031 } 4032 } else if (D.getCXXScopeSpec().isSet()) { 4033 // No previous declaration in the qualifying scope. 4034 Diag(D.getIdentifierLoc(), diag::err_no_member) 4035 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4036 << D.getCXXScopeSpec().getRange(); 4037 NewVD->setInvalidDecl(); 4038 } 4039 4040 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4041 4042 // This is an explicit specialization of a static data member. Check it. 4043 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4044 CheckMemberSpecialization(NewVD, Previous)) 4045 NewVD->setInvalidDecl(); 4046 } 4047 4048 // attributes declared post-definition are currently ignored 4049 // FIXME: This should be handled in attribute merging, not 4050 // here. 4051 if (Previous.isSingleResult()) { 4052 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4053 if (Def && (Def = Def->getDefinition()) && 4054 Def != NewVD && D.hasAttributes()) { 4055 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4056 Diag(Def->getLocation(), diag::note_previous_definition); 4057 } 4058 } 4059 4060 // If this is a locally-scoped extern C variable, update the map of 4061 // such variables. 4062 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4063 !NewVD->isInvalidDecl()) 4064 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4065 4066 // If there's a #pragma GCC visibility in scope, and this isn't a class 4067 // member, set the visibility of this variable. 4068 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4069 AddPushedVisibilityAttribute(NewVD); 4070 4071 MarkUnusedFileScopedDecl(NewVD); 4072 4073 return NewVD; 4074} 4075 4076/// \brief Diagnose variable or built-in function shadowing. Implements 4077/// -Wshadow. 4078/// 4079/// This method is called whenever a VarDecl is added to a "useful" 4080/// scope. 4081/// 4082/// \param S the scope in which the shadowing name is being declared 4083/// \param R the lookup of the name 4084/// 4085void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4086 // Return if warning is ignored. 4087 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4088 DiagnosticsEngine::Ignored) 4089 return; 4090 4091 // Don't diagnose declarations at file scope. 4092 if (D->hasGlobalStorage()) 4093 return; 4094 4095 DeclContext *NewDC = D->getDeclContext(); 4096 4097 // Only diagnose if we're shadowing an unambiguous field or variable. 4098 if (R.getResultKind() != LookupResult::Found) 4099 return; 4100 4101 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4102 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4103 return; 4104 4105 // Fields are not shadowed by variables in C++ static methods. 4106 if (isa<FieldDecl>(ShadowedDecl)) 4107 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4108 if (MD->isStatic()) 4109 return; 4110 4111 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4112 if (shadowedVar->isExternC()) { 4113 // For shadowing external vars, make sure that we point to the global 4114 // declaration, not a locally scoped extern declaration. 4115 for (VarDecl::redecl_iterator 4116 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4117 I != E; ++I) 4118 if (I->isFileVarDecl()) { 4119 ShadowedDecl = *I; 4120 break; 4121 } 4122 } 4123 4124 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4125 4126 // Only warn about certain kinds of shadowing for class members. 4127 if (NewDC && NewDC->isRecord()) { 4128 // In particular, don't warn about shadowing non-class members. 4129 if (!OldDC->isRecord()) 4130 return; 4131 4132 // TODO: should we warn about static data members shadowing 4133 // static data members from base classes? 4134 4135 // TODO: don't diagnose for inaccessible shadowed members. 4136 // This is hard to do perfectly because we might friend the 4137 // shadowing context, but that's just a false negative. 4138 } 4139 4140 // Determine what kind of declaration we're shadowing. 4141 unsigned Kind; 4142 if (isa<RecordDecl>(OldDC)) { 4143 if (isa<FieldDecl>(ShadowedDecl)) 4144 Kind = 3; // field 4145 else 4146 Kind = 2; // static data member 4147 } else if (OldDC->isFileContext()) 4148 Kind = 1; // global 4149 else 4150 Kind = 0; // local 4151 4152 DeclarationName Name = R.getLookupName(); 4153 4154 // Emit warning and note. 4155 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4156 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4157} 4158 4159/// \brief Check -Wshadow without the advantage of a previous lookup. 4160void Sema::CheckShadow(Scope *S, VarDecl *D) { 4161 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4162 DiagnosticsEngine::Ignored) 4163 return; 4164 4165 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4166 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4167 LookupName(R, S); 4168 CheckShadow(S, D, R); 4169} 4170 4171/// \brief Perform semantic checking on a newly-created variable 4172/// declaration. 4173/// 4174/// This routine performs all of the type-checking required for a 4175/// variable declaration once it has been built. It is used both to 4176/// check variables after they have been parsed and their declarators 4177/// have been translated into a declaration, and to check variables 4178/// that have been instantiated from a template. 4179/// 4180/// Sets NewVD->isInvalidDecl() if an error was encountered. 4181/// 4182/// Returns true if the variable declaration is a redeclaration. 4183bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4184 LookupResult &Previous) { 4185 // If the decl is already known invalid, don't check it. 4186 if (NewVD->isInvalidDecl()) 4187 return false; 4188 4189 QualType T = NewVD->getType(); 4190 4191 if (T->isObjCObjectType()) { 4192 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4193 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4194 T = Context.getObjCObjectPointerType(T); 4195 NewVD->setType(T); 4196 } 4197 4198 // Emit an error if an address space was applied to decl with local storage. 4199 // This includes arrays of objects with address space qualifiers, but not 4200 // automatic variables that point to other address spaces. 4201 // ISO/IEC TR 18037 S5.1.2 4202 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4203 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4204 NewVD->setInvalidDecl(); 4205 return false; 4206 } 4207 4208 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4209 && !NewVD->hasAttr<BlocksAttr>()) { 4210 if (getLangOptions().getGC() != LangOptions::NonGC) 4211 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4212 else 4213 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4214 } 4215 4216 bool isVM = T->isVariablyModifiedType(); 4217 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4218 NewVD->hasAttr<BlocksAttr>()) 4219 getCurFunction()->setHasBranchProtectedScope(); 4220 4221 if ((isVM && NewVD->hasLinkage()) || 4222 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4223 bool SizeIsNegative; 4224 llvm::APSInt Oversized; 4225 QualType FixedTy = 4226 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4227 Oversized); 4228 4229 if (FixedTy.isNull() && T->isVariableArrayType()) { 4230 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4231 // FIXME: This won't give the correct result for 4232 // int a[10][n]; 4233 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4234 4235 if (NewVD->isFileVarDecl()) 4236 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4237 << SizeRange; 4238 else if (NewVD->getStorageClass() == SC_Static) 4239 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4240 << SizeRange; 4241 else 4242 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4243 << SizeRange; 4244 NewVD->setInvalidDecl(); 4245 return false; 4246 } 4247 4248 if (FixedTy.isNull()) { 4249 if (NewVD->isFileVarDecl()) 4250 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4251 else 4252 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4253 NewVD->setInvalidDecl(); 4254 return false; 4255 } 4256 4257 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4258 NewVD->setType(FixedTy); 4259 } 4260 4261 if (Previous.empty() && NewVD->isExternC()) { 4262 // Since we did not find anything by this name and we're declaring 4263 // an extern "C" variable, look for a non-visible extern "C" 4264 // declaration with the same name. 4265 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4266 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4267 if (Pos != LocallyScopedExternalDecls.end()) 4268 Previous.addDecl(Pos->second); 4269 } 4270 4271 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4272 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4273 << T; 4274 NewVD->setInvalidDecl(); 4275 return false; 4276 } 4277 4278 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4279 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4280 NewVD->setInvalidDecl(); 4281 return false; 4282 } 4283 4284 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4285 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4286 NewVD->setInvalidDecl(); 4287 return false; 4288 } 4289 4290 // Function pointers and references cannot have qualified function type, only 4291 // function pointer-to-members can do that. 4292 QualType Pointee; 4293 unsigned PtrOrRef = 0; 4294 if (const PointerType *Ptr = T->getAs<PointerType>()) 4295 Pointee = Ptr->getPointeeType(); 4296 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4297 Pointee = Ref->getPointeeType(); 4298 PtrOrRef = 1; 4299 } 4300 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4301 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4302 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4303 << PtrOrRef; 4304 NewVD->setInvalidDecl(); 4305 return false; 4306 } 4307 4308 if (!Previous.empty()) { 4309 MergeVarDecl(NewVD, Previous); 4310 return true; 4311 } 4312 return false; 4313} 4314 4315/// \brief Data used with FindOverriddenMethod 4316struct FindOverriddenMethodData { 4317 Sema *S; 4318 CXXMethodDecl *Method; 4319}; 4320 4321/// \brief Member lookup function that determines whether a given C++ 4322/// method overrides a method in a base class, to be used with 4323/// CXXRecordDecl::lookupInBases(). 4324static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4325 CXXBasePath &Path, 4326 void *UserData) { 4327 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4328 4329 FindOverriddenMethodData *Data 4330 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4331 4332 DeclarationName Name = Data->Method->getDeclName(); 4333 4334 // FIXME: Do we care about other names here too? 4335 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4336 // We really want to find the base class destructor here. 4337 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4338 CanQualType CT = Data->S->Context.getCanonicalType(T); 4339 4340 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4341 } 4342 4343 for (Path.Decls = BaseRecord->lookup(Name); 4344 Path.Decls.first != Path.Decls.second; 4345 ++Path.Decls.first) { 4346 NamedDecl *D = *Path.Decls.first; 4347 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4348 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4349 return true; 4350 } 4351 } 4352 4353 return false; 4354} 4355 4356/// AddOverriddenMethods - See if a method overrides any in the base classes, 4357/// and if so, check that it's a valid override and remember it. 4358bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4359 // Look for virtual methods in base classes that this method might override. 4360 CXXBasePaths Paths; 4361 FindOverriddenMethodData Data; 4362 Data.Method = MD; 4363 Data.S = this; 4364 bool AddedAny = false; 4365 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4366 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4367 E = Paths.found_decls_end(); I != E; ++I) { 4368 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4369 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4370 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4371 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4372 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4373 AddedAny = true; 4374 } 4375 } 4376 } 4377 } 4378 4379 return AddedAny; 4380} 4381 4382namespace { 4383 // Struct for holding all of the extra arguments needed by 4384 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4385 struct ActOnFDArgs { 4386 Scope *S; 4387 Declarator &D; 4388 MultiTemplateParamsArg TemplateParamLists; 4389 bool AddToScope; 4390 }; 4391} 4392 4393/// \brief Generate diagnostics for an invalid function redeclaration. 4394/// 4395/// This routine handles generating the diagnostic messages for an invalid 4396/// function redeclaration, including finding possible similar declarations 4397/// or performing typo correction if there are no previous declarations with 4398/// the same name. 4399/// 4400/// Returns a NamedDecl iff typo correction was performed and substituting in 4401/// the new declaration name does not cause new errors. 4402static NamedDecl* DiagnoseInvalidRedeclaration( 4403 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4404 ActOnFDArgs &ExtraArgs) { 4405 NamedDecl *Result = NULL; 4406 DeclarationName Name = NewFD->getDeclName(); 4407 DeclContext *NewDC = NewFD->getDeclContext(); 4408 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4409 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4410 llvm::SmallVector<unsigned, 1> MismatchedParams; 4411 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4412 TypoCorrection Correction; 4413 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4414 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4415 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4416 : diag::err_member_def_does_not_match; 4417 4418 NewFD->setInvalidDecl(); 4419 SemaRef.LookupQualifiedName(Prev, NewDC); 4420 assert(!Prev.isAmbiguous() && 4421 "Cannot have an ambiguity in previous-declaration lookup"); 4422 if (!Prev.empty()) { 4423 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4424 Func != FuncEnd; ++Func) { 4425 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4426 if (FD && 4427 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4428 // Add 1 to the index so that 0 can mean the mismatch didn't 4429 // involve a parameter 4430 unsigned ParamNum = 4431 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4432 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4433 } 4434 } 4435 // If the qualified name lookup yielded nothing, try typo correction 4436 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4437 Prev.getLookupKind(), 0, 0, NewDC)) && 4438 Correction.getCorrection() != Name) { 4439 // Trap errors. 4440 Sema::SFINAETrap Trap(SemaRef); 4441 4442 // Set up everything for the call to ActOnFunctionDeclarator 4443 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4444 ExtraArgs.D.getIdentifierLoc()); 4445 Previous.clear(); 4446 Previous.setLookupName(Correction.getCorrection()); 4447 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4448 CDeclEnd = Correction.end(); 4449 CDecl != CDeclEnd; ++CDecl) { 4450 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4451 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4452 MismatchedParams)) { 4453 Previous.addDecl(FD); 4454 } 4455 } 4456 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4457 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4458 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4459 // eliminate the need for the parameter pack ExtraArgs. 4460 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4461 NewFD->getDeclContext(), 4462 NewFD->getTypeSourceInfo(), 4463 Previous, 4464 ExtraArgs.TemplateParamLists, 4465 ExtraArgs.AddToScope); 4466 if (Trap.hasErrorOccurred()) { 4467 // Pretend the typo correction never occurred 4468 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4469 ExtraArgs.D.getIdentifierLoc()); 4470 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4471 Previous.clear(); 4472 Previous.setLookupName(Name); 4473 Result = NULL; 4474 } else { 4475 for (LookupResult::iterator Func = Previous.begin(), 4476 FuncEnd = Previous.end(); 4477 Func != FuncEnd; ++Func) { 4478 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4479 NearMatches.push_back(std::make_pair(FD, 0)); 4480 } 4481 } 4482 if (NearMatches.empty()) { 4483 // Ignore the correction if it didn't yield any close FunctionDecl matches 4484 Correction = TypoCorrection(); 4485 } else { 4486 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4487 : diag::err_member_def_does_not_match_suggest; 4488 } 4489 } 4490 4491 if (Correction) 4492 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4493 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4494 << FixItHint::CreateReplacement( 4495 NewFD->getLocation(), 4496 Correction.getAsString(SemaRef.getLangOptions())); 4497 else 4498 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4499 << Name << NewDC << NewFD->getLocation(); 4500 4501 bool NewFDisConst = false; 4502 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4503 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4504 4505 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4506 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4507 NearMatch != NearMatchEnd; ++NearMatch) { 4508 FunctionDecl *FD = NearMatch->first; 4509 bool FDisConst = false; 4510 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4511 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4512 4513 if (unsigned Idx = NearMatch->second) { 4514 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4515 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4516 diag::note_member_def_close_param_match) 4517 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4518 } else if (Correction) { 4519 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4520 << Correction.getQuoted(SemaRef.getLangOptions()); 4521 } else if (FDisConst != NewFDisConst) { 4522 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4523 << NewFDisConst << FD->getSourceRange().getEnd(); 4524 } else 4525 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4526 } 4527 return Result; 4528} 4529 4530static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4531 Declarator &D) { 4532 switch (D.getDeclSpec().getStorageClassSpec()) { 4533 default: llvm_unreachable("Unknown storage class!"); 4534 case DeclSpec::SCS_auto: 4535 case DeclSpec::SCS_register: 4536 case DeclSpec::SCS_mutable: 4537 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4538 diag::err_typecheck_sclass_func); 4539 D.setInvalidType(); 4540 break; 4541 case DeclSpec::SCS_unspecified: break; 4542 case DeclSpec::SCS_extern: return SC_Extern; 4543 case DeclSpec::SCS_static: { 4544 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4545 // C99 6.7.1p5: 4546 // The declaration of an identifier for a function that has 4547 // block scope shall have no explicit storage-class specifier 4548 // other than extern 4549 // See also (C++ [dcl.stc]p4). 4550 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4551 diag::err_static_block_func); 4552 break; 4553 } else 4554 return SC_Static; 4555 } 4556 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4557 } 4558 4559 // No explicit storage class has already been returned 4560 return SC_None; 4561} 4562 4563static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4564 DeclContext *DC, QualType &R, 4565 TypeSourceInfo *TInfo, 4566 FunctionDecl::StorageClass SC, 4567 bool &IsVirtualOkay) { 4568 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4569 DeclarationName Name = NameInfo.getName(); 4570 4571 FunctionDecl *NewFD = 0; 4572 bool isInline = D.getDeclSpec().isInlineSpecified(); 4573 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4574 FunctionDecl::StorageClass SCAsWritten 4575 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4576 4577 if (!SemaRef.getLangOptions().CPlusPlus) { 4578 // Determine whether the function was written with a 4579 // prototype. This true when: 4580 // - there is a prototype in the declarator, or 4581 // - the type R of the function is some kind of typedef or other reference 4582 // to a type name (which eventually refers to a function type). 4583 bool HasPrototype = 4584 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4585 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4586 4587 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4588 D.getSourceRange().getBegin(), NameInfo, R, 4589 TInfo, SC, SCAsWritten, isInline, 4590 HasPrototype); 4591 if (D.isInvalidType()) 4592 NewFD->setInvalidDecl(); 4593 4594 // Set the lexical context. 4595 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4596 4597 return NewFD; 4598 } 4599 4600 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4601 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4602 4603 // Check that the return type is not an abstract class type. 4604 // For record types, this is done by the AbstractClassUsageDiagnoser once 4605 // the class has been completely parsed. 4606 if (!DC->isRecord() && 4607 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4608 R->getAs<FunctionType>()->getResultType(), 4609 diag::err_abstract_type_in_decl, 4610 SemaRef.AbstractReturnType)) 4611 D.setInvalidType(); 4612 4613 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4614 // This is a C++ constructor declaration. 4615 assert(DC->isRecord() && 4616 "Constructors can only be declared in a member context"); 4617 4618 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4619 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4620 D.getSourceRange().getBegin(), NameInfo, 4621 R, TInfo, isExplicit, isInline, 4622 /*isImplicitlyDeclared=*/false, 4623 isConstexpr); 4624 4625 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4626 // This is a C++ destructor declaration. 4627 if (DC->isRecord()) { 4628 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4629 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4630 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4631 SemaRef.Context, Record, 4632 D.getSourceRange().getBegin(), 4633 NameInfo, R, TInfo, isInline, 4634 /*isImplicitlyDeclared=*/false); 4635 4636 // If the class is complete, then we now create the implicit exception 4637 // specification. If the class is incomplete or dependent, we can't do 4638 // it yet. 4639 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4640 Record->getDefinition() && !Record->isBeingDefined() && 4641 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4642 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4643 } 4644 4645 IsVirtualOkay = true; 4646 return NewDD; 4647 4648 } else { 4649 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4650 D.setInvalidType(); 4651 4652 // Create a FunctionDecl to satisfy the function definition parsing 4653 // code path. 4654 return FunctionDecl::Create(SemaRef.Context, DC, 4655 D.getSourceRange().getBegin(), 4656 D.getIdentifierLoc(), Name, R, TInfo, 4657 SC, SCAsWritten, isInline, 4658 /*hasPrototype=*/true, isConstexpr); 4659 } 4660 4661 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4662 if (!DC->isRecord()) { 4663 SemaRef.Diag(D.getIdentifierLoc(), 4664 diag::err_conv_function_not_member); 4665 return 0; 4666 } 4667 4668 SemaRef.CheckConversionDeclarator(D, R, SC); 4669 IsVirtualOkay = true; 4670 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4671 D.getSourceRange().getBegin(), NameInfo, 4672 R, TInfo, isInline, isExplicit, 4673 isConstexpr, SourceLocation()); 4674 4675 } else if (DC->isRecord()) { 4676 // If the name of the function is the same as the name of the record, 4677 // then this must be an invalid constructor that has a return type. 4678 // (The parser checks for a return type and makes the declarator a 4679 // constructor if it has no return type). 4680 if (Name.getAsIdentifierInfo() && 4681 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4682 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4683 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4684 << SourceRange(D.getIdentifierLoc()); 4685 return 0; 4686 } 4687 4688 bool isStatic = SC == SC_Static; 4689 4690 // [class.free]p1: 4691 // Any allocation function for a class T is a static member 4692 // (even if not explicitly declared static). 4693 if (Name.getCXXOverloadedOperator() == OO_New || 4694 Name.getCXXOverloadedOperator() == OO_Array_New) 4695 isStatic = true; 4696 4697 // [class.free]p6 Any deallocation function for a class X is a static member 4698 // (even if not explicitly declared static). 4699 if (Name.getCXXOverloadedOperator() == OO_Delete || 4700 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4701 isStatic = true; 4702 4703 IsVirtualOkay = !isStatic; 4704 4705 // This is a C++ method declaration. 4706 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4707 D.getSourceRange().getBegin(), NameInfo, R, 4708 TInfo, isStatic, SCAsWritten, isInline, 4709 isConstexpr, SourceLocation()); 4710 4711 } else { 4712 // Determine whether the function was written with a 4713 // prototype. This true when: 4714 // - we're in C++ (where every function has a prototype), 4715 return FunctionDecl::Create(SemaRef.Context, DC, 4716 D.getSourceRange().getBegin(), 4717 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4718 true/*HasPrototype*/, isConstexpr); 4719 } 4720} 4721 4722NamedDecl* 4723Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4724 TypeSourceInfo *TInfo, LookupResult &Previous, 4725 MultiTemplateParamsArg TemplateParamLists, 4726 bool &AddToScope) { 4727 QualType R = TInfo->getType(); 4728 4729 assert(R.getTypePtr()->isFunctionType()); 4730 4731 // TODO: consider using NameInfo for diagnostic. 4732 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4733 DeclarationName Name = NameInfo.getName(); 4734 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4735 4736 if (D.getDeclSpec().isThreadSpecified()) 4737 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4738 4739 // Do not allow returning a objc interface by-value. 4740 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4741 Diag(D.getIdentifierLoc(), 4742 diag::err_object_cannot_be_passed_returned_by_value) << 0 4743 << R->getAs<FunctionType>()->getResultType() 4744 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4745 4746 QualType T = R->getAs<FunctionType>()->getResultType(); 4747 T = Context.getObjCObjectPointerType(T); 4748 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4749 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4750 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4751 FPT->getNumArgs(), EPI); 4752 } 4753 else if (isa<FunctionNoProtoType>(R)) 4754 R = Context.getFunctionNoProtoType(T); 4755 } 4756 4757 bool isFriend = false; 4758 FunctionTemplateDecl *FunctionTemplate = 0; 4759 bool isExplicitSpecialization = false; 4760 bool isFunctionTemplateSpecialization = false; 4761 bool isDependentClassScopeExplicitSpecialization = false; 4762 bool isVirtualOkay = false; 4763 4764 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4765 isVirtualOkay); 4766 if (!NewFD) return 0; 4767 4768 if (getLangOptions().CPlusPlus) { 4769 bool isInline = D.getDeclSpec().isInlineSpecified(); 4770 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4771 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4772 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4773 isFriend = D.getDeclSpec().isFriendSpecified(); 4774 if (isFriend && !isInline && D.isFunctionDefinition()) { 4775 // C++ [class.friend]p5 4776 // A function can be defined in a friend declaration of a 4777 // class . . . . Such a function is implicitly inline. 4778 NewFD->setImplicitlyInline(); 4779 } 4780 4781 SetNestedNameSpecifier(NewFD, D); 4782 isExplicitSpecialization = false; 4783 isFunctionTemplateSpecialization = false; 4784 if (D.isInvalidType()) 4785 NewFD->setInvalidDecl(); 4786 4787 // Set the lexical context. If the declarator has a C++ 4788 // scope specifier, or is the object of a friend declaration, the 4789 // lexical context will be different from the semantic context. 4790 NewFD->setLexicalDeclContext(CurContext); 4791 4792 // Match up the template parameter lists with the scope specifier, then 4793 // determine whether we have a template or a template specialization. 4794 bool Invalid = false; 4795 if (TemplateParameterList *TemplateParams 4796 = MatchTemplateParametersToScopeSpecifier( 4797 D.getDeclSpec().getSourceRange().getBegin(), 4798 D.getIdentifierLoc(), 4799 D.getCXXScopeSpec(), 4800 TemplateParamLists.get(), 4801 TemplateParamLists.size(), 4802 isFriend, 4803 isExplicitSpecialization, 4804 Invalid)) { 4805 if (TemplateParams->size() > 0) { 4806 // This is a function template 4807 4808 // Check that we can declare a template here. 4809 if (CheckTemplateDeclScope(S, TemplateParams)) 4810 return 0; 4811 4812 // A destructor cannot be a template. 4813 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4814 Diag(NewFD->getLocation(), diag::err_destructor_template); 4815 return 0; 4816 } 4817 4818 // If we're adding a template to a dependent context, we may need to 4819 // rebuilding some of the types used within the template parameter list, 4820 // now that we know what the current instantiation is. 4821 if (DC->isDependentContext()) { 4822 ContextRAII SavedContext(*this, DC); 4823 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4824 Invalid = true; 4825 } 4826 4827 4828 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4829 NewFD->getLocation(), 4830 Name, TemplateParams, 4831 NewFD); 4832 FunctionTemplate->setLexicalDeclContext(CurContext); 4833 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4834 4835 // For source fidelity, store the other template param lists. 4836 if (TemplateParamLists.size() > 1) { 4837 NewFD->setTemplateParameterListsInfo(Context, 4838 TemplateParamLists.size() - 1, 4839 TemplateParamLists.release()); 4840 } 4841 } else { 4842 // This is a function template specialization. 4843 isFunctionTemplateSpecialization = true; 4844 // For source fidelity, store all the template param lists. 4845 NewFD->setTemplateParameterListsInfo(Context, 4846 TemplateParamLists.size(), 4847 TemplateParamLists.release()); 4848 4849 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4850 if (isFriend) { 4851 // We want to remove the "template<>", found here. 4852 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4853 4854 // If we remove the template<> and the name is not a 4855 // template-id, we're actually silently creating a problem: 4856 // the friend declaration will refer to an untemplated decl, 4857 // and clearly the user wants a template specialization. So 4858 // we need to insert '<>' after the name. 4859 SourceLocation InsertLoc; 4860 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4861 InsertLoc = D.getName().getSourceRange().getEnd(); 4862 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4863 } 4864 4865 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4866 << Name << RemoveRange 4867 << FixItHint::CreateRemoval(RemoveRange) 4868 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4869 } 4870 } 4871 } 4872 else { 4873 // All template param lists were matched against the scope specifier: 4874 // this is NOT (an explicit specialization of) a template. 4875 if (TemplateParamLists.size() > 0) 4876 // For source fidelity, store all the template param lists. 4877 NewFD->setTemplateParameterListsInfo(Context, 4878 TemplateParamLists.size(), 4879 TemplateParamLists.release()); 4880 } 4881 4882 if (Invalid) { 4883 NewFD->setInvalidDecl(); 4884 if (FunctionTemplate) 4885 FunctionTemplate->setInvalidDecl(); 4886 } 4887 4888 // C++ [dcl.fct.spec]p5: 4889 // The virtual specifier shall only be used in declarations of 4890 // nonstatic class member functions that appear within a 4891 // member-specification of a class declaration; see 10.3. 4892 // 4893 if (isVirtual && !NewFD->isInvalidDecl()) { 4894 if (!isVirtualOkay) { 4895 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4896 diag::err_virtual_non_function); 4897 } else if (!CurContext->isRecord()) { 4898 // 'virtual' was specified outside of the class. 4899 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4900 diag::err_virtual_out_of_class) 4901 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4902 } else if (NewFD->getDescribedFunctionTemplate()) { 4903 // C++ [temp.mem]p3: 4904 // A member function template shall not be virtual. 4905 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4906 diag::err_virtual_member_function_template) 4907 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4908 } else { 4909 // Okay: Add virtual to the method. 4910 NewFD->setVirtualAsWritten(true); 4911 } 4912 } 4913 4914 // C++ [dcl.fct.spec]p3: 4915 // The inline specifier shall not appear on a block scope function 4916 // declaration. 4917 if (isInline && !NewFD->isInvalidDecl()) { 4918 if (CurContext->isFunctionOrMethod()) { 4919 // 'inline' is not allowed on block scope function declaration. 4920 Diag(D.getDeclSpec().getInlineSpecLoc(), 4921 diag::err_inline_declaration_block_scope) << Name 4922 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4923 } 4924 } 4925 4926 // C++ [dcl.fct.spec]p6: 4927 // The explicit specifier shall be used only in the declaration of a 4928 // constructor or conversion function within its class definition; 4929 // see 12.3.1 and 12.3.2. 4930 if (isExplicit && !NewFD->isInvalidDecl()) { 4931 if (!CurContext->isRecord()) { 4932 // 'explicit' was specified outside of the class. 4933 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4934 diag::err_explicit_out_of_class) 4935 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4936 } else if (!isa<CXXConstructorDecl>(NewFD) && 4937 !isa<CXXConversionDecl>(NewFD)) { 4938 // 'explicit' was specified on a function that wasn't a constructor 4939 // or conversion function. 4940 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4941 diag::err_explicit_non_ctor_or_conv_function) 4942 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4943 } 4944 } 4945 4946 if (isConstexpr) { 4947 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4948 // are implicitly inline. 4949 NewFD->setImplicitlyInline(); 4950 4951 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4952 // be either constructors or to return a literal type. Therefore, 4953 // destructors cannot be declared constexpr. 4954 if (isa<CXXDestructorDecl>(NewFD)) 4955 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4956 } 4957 4958 // If __module_private__ was specified, mark the function accordingly. 4959 if (D.getDeclSpec().isModulePrivateSpecified()) { 4960 if (isFunctionTemplateSpecialization) { 4961 SourceLocation ModulePrivateLoc 4962 = D.getDeclSpec().getModulePrivateSpecLoc(); 4963 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4964 << 0 4965 << FixItHint::CreateRemoval(ModulePrivateLoc); 4966 } else { 4967 NewFD->setModulePrivate(); 4968 if (FunctionTemplate) 4969 FunctionTemplate->setModulePrivate(); 4970 } 4971 } 4972 4973 if (isFriend) { 4974 // For now, claim that the objects have no previous declaration. 4975 if (FunctionTemplate) { 4976 FunctionTemplate->setObjectOfFriendDecl(false); 4977 FunctionTemplate->setAccess(AS_public); 4978 } 4979 NewFD->setObjectOfFriendDecl(false); 4980 NewFD->setAccess(AS_public); 4981 } 4982 4983 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4984 D.isFunctionDefinition()) { 4985 // A method is implicitly inline if it's defined in its class 4986 // definition. 4987 NewFD->setImplicitlyInline(); 4988 } 4989 4990 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4991 !CurContext->isRecord()) { 4992 // C++ [class.static]p1: 4993 // A data or function member of a class may be declared static 4994 // in a class definition, in which case it is a static member of 4995 // the class. 4996 4997 // Complain about the 'static' specifier if it's on an out-of-line 4998 // member function definition. 4999 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5000 diag::err_static_out_of_line) 5001 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5002 } 5003 } 5004 5005 // Filter out previous declarations that don't match the scope. 5006 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5007 isExplicitSpecialization || 5008 isFunctionTemplateSpecialization); 5009 5010 // Handle GNU asm-label extension (encoded as an attribute). 5011 if (Expr *E = (Expr*) D.getAsmLabel()) { 5012 // The parser guarantees this is a string. 5013 StringLiteral *SE = cast<StringLiteral>(E); 5014 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5015 SE->getString())); 5016 } 5017 5018 // Copy the parameter declarations from the declarator D to the function 5019 // declaration NewFD, if they are available. First scavenge them into Params. 5020 SmallVector<ParmVarDecl*, 16> Params; 5021 if (D.isFunctionDeclarator()) { 5022 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5023 5024 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5025 // function that takes no arguments, not a function that takes a 5026 // single void argument. 5027 // We let through "const void" here because Sema::GetTypeForDeclarator 5028 // already checks for that case. 5029 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5030 FTI.ArgInfo[0].Param && 5031 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5032 // Empty arg list, don't push any params. 5033 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5034 5035 // In C++, the empty parameter-type-list must be spelled "void"; a 5036 // typedef of void is not permitted. 5037 if (getLangOptions().CPlusPlus && 5038 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5039 bool IsTypeAlias = false; 5040 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5041 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5042 else if (const TemplateSpecializationType *TST = 5043 Param->getType()->getAs<TemplateSpecializationType>()) 5044 IsTypeAlias = TST->isTypeAlias(); 5045 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5046 << IsTypeAlias; 5047 } 5048 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5049 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5050 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5051 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5052 Param->setDeclContext(NewFD); 5053 Params.push_back(Param); 5054 5055 if (Param->isInvalidDecl()) 5056 NewFD->setInvalidDecl(); 5057 } 5058 } 5059 5060 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5061 // When we're declaring a function with a typedef, typeof, etc as in the 5062 // following example, we'll need to synthesize (unnamed) 5063 // parameters for use in the declaration. 5064 // 5065 // @code 5066 // typedef void fn(int); 5067 // fn f; 5068 // @endcode 5069 5070 // Synthesize a parameter for each argument type. 5071 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5072 AE = FT->arg_type_end(); AI != AE; ++AI) { 5073 ParmVarDecl *Param = 5074 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5075 Param->setScopeInfo(0, Params.size()); 5076 Params.push_back(Param); 5077 } 5078 } else { 5079 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5080 "Should not need args for typedef of non-prototype fn"); 5081 } 5082 5083 // Finally, we know we have the right number of parameters, install them. 5084 NewFD->setParams(Params); 5085 5086 // Process the non-inheritable attributes on this declaration. 5087 ProcessDeclAttributes(S, NewFD, D, 5088 /*NonInheritable=*/true, /*Inheritable=*/false); 5089 5090 if (!getLangOptions().CPlusPlus) { 5091 // Perform semantic checking on the function declaration. 5092 bool isExplicitSpecialization=false; 5093 if (!NewFD->isInvalidDecl()) { 5094 if (NewFD->getResultType()->isVariablyModifiedType()) { 5095 // Functions returning a variably modified type violate C99 6.7.5.2p2 5096 // because all functions have linkage. 5097 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5098 NewFD->setInvalidDecl(); 5099 } else { 5100 if (NewFD->isMain()) 5101 CheckMain(NewFD, D.getDeclSpec()); 5102 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5103 isExplicitSpecialization)); 5104 } 5105 } 5106 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5107 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5108 "previous declaration set still overloaded"); 5109 } else { 5110 // If the declarator is a template-id, translate the parser's template 5111 // argument list into our AST format. 5112 bool HasExplicitTemplateArgs = false; 5113 TemplateArgumentListInfo TemplateArgs; 5114 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5115 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5116 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5117 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5118 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5119 TemplateId->getTemplateArgs(), 5120 TemplateId->NumArgs); 5121 translateTemplateArguments(TemplateArgsPtr, 5122 TemplateArgs); 5123 TemplateArgsPtr.release(); 5124 5125 HasExplicitTemplateArgs = true; 5126 5127 if (NewFD->isInvalidDecl()) { 5128 HasExplicitTemplateArgs = false; 5129 } else if (FunctionTemplate) { 5130 // Function template with explicit template arguments. 5131 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5132 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5133 5134 HasExplicitTemplateArgs = false; 5135 } else if (!isFunctionTemplateSpecialization && 5136 !D.getDeclSpec().isFriendSpecified()) { 5137 // We have encountered something that the user meant to be a 5138 // specialization (because it has explicitly-specified template 5139 // arguments) but that was not introduced with a "template<>" (or had 5140 // too few of them). 5141 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5142 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5143 << FixItHint::CreateInsertion( 5144 D.getDeclSpec().getSourceRange().getBegin(), 5145 "template<> "); 5146 isFunctionTemplateSpecialization = true; 5147 } else { 5148 // "friend void foo<>(int);" is an implicit specialization decl. 5149 isFunctionTemplateSpecialization = true; 5150 } 5151 } else if (isFriend && isFunctionTemplateSpecialization) { 5152 // This combination is only possible in a recovery case; the user 5153 // wrote something like: 5154 // template <> friend void foo(int); 5155 // which we're recovering from as if the user had written: 5156 // friend void foo<>(int); 5157 // Go ahead and fake up a template id. 5158 HasExplicitTemplateArgs = true; 5159 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5160 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5161 } 5162 5163 // If it's a friend (and only if it's a friend), it's possible 5164 // that either the specialized function type or the specialized 5165 // template is dependent, and therefore matching will fail. In 5166 // this case, don't check the specialization yet. 5167 bool InstantiationDependent = false; 5168 if (isFunctionTemplateSpecialization && isFriend && 5169 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5170 TemplateSpecializationType::anyDependentTemplateArguments( 5171 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5172 InstantiationDependent))) { 5173 assert(HasExplicitTemplateArgs && 5174 "friend function specialization without template args"); 5175 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5176 Previous)) 5177 NewFD->setInvalidDecl(); 5178 } else if (isFunctionTemplateSpecialization) { 5179 if (CurContext->isDependentContext() && CurContext->isRecord() 5180 && !isFriend) { 5181 isDependentClassScopeExplicitSpecialization = true; 5182 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5183 diag::ext_function_specialization_in_class : 5184 diag::err_function_specialization_in_class) 5185 << NewFD->getDeclName(); 5186 } else if (CheckFunctionTemplateSpecialization(NewFD, 5187 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5188 Previous)) 5189 NewFD->setInvalidDecl(); 5190 5191 // C++ [dcl.stc]p1: 5192 // A storage-class-specifier shall not be specified in an explicit 5193 // specialization (14.7.3) 5194 if (SC != SC_None) { 5195 if (SC != NewFD->getStorageClass()) 5196 Diag(NewFD->getLocation(), 5197 diag::err_explicit_specialization_inconsistent_storage_class) 5198 << SC 5199 << FixItHint::CreateRemoval( 5200 D.getDeclSpec().getStorageClassSpecLoc()); 5201 5202 else 5203 Diag(NewFD->getLocation(), 5204 diag::ext_explicit_specialization_storage_class) 5205 << FixItHint::CreateRemoval( 5206 D.getDeclSpec().getStorageClassSpecLoc()); 5207 } 5208 5209 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5210 if (CheckMemberSpecialization(NewFD, Previous)) 5211 NewFD->setInvalidDecl(); 5212 } 5213 5214 // Perform semantic checking on the function declaration. 5215 if (!isDependentClassScopeExplicitSpecialization) { 5216 if (NewFD->isInvalidDecl()) { 5217 // If this is a class member, mark the class invalid immediately. 5218 // This avoids some consistency errors later. 5219 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5220 methodDecl->getParent()->setInvalidDecl(); 5221 } else { 5222 if (NewFD->isMain()) 5223 CheckMain(NewFD, D.getDeclSpec()); 5224 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5225 isExplicitSpecialization)); 5226 } 5227 } 5228 5229 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5230 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5231 "previous declaration set still overloaded"); 5232 5233 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5234 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5235 NewFD->setInvalidDecl(); 5236 5237 NamedDecl *PrincipalDecl = (FunctionTemplate 5238 ? cast<NamedDecl>(FunctionTemplate) 5239 : NewFD); 5240 5241 if (isFriend && D.isRedeclaration()) { 5242 AccessSpecifier Access = AS_public; 5243 if (!NewFD->isInvalidDecl()) 5244 Access = NewFD->getPreviousDeclaration()->getAccess(); 5245 5246 NewFD->setAccess(Access); 5247 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5248 5249 PrincipalDecl->setObjectOfFriendDecl(true); 5250 } 5251 5252 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5253 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5254 PrincipalDecl->setNonMemberOperator(); 5255 5256 // If we have a function template, check the template parameter 5257 // list. This will check and merge default template arguments. 5258 if (FunctionTemplate) { 5259 FunctionTemplateDecl *PrevTemplate = 5260 FunctionTemplate->getPreviousDeclaration(); 5261 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5262 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5263 D.getDeclSpec().isFriendSpecified() 5264 ? (D.isFunctionDefinition() 5265 ? TPC_FriendFunctionTemplateDefinition 5266 : TPC_FriendFunctionTemplate) 5267 : (D.getCXXScopeSpec().isSet() && 5268 DC && DC->isRecord() && 5269 DC->isDependentContext()) 5270 ? TPC_ClassTemplateMember 5271 : TPC_FunctionTemplate); 5272 } 5273 5274 if (NewFD->isInvalidDecl()) { 5275 // Ignore all the rest of this. 5276 } else if (!D.isRedeclaration()) { 5277 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5278 AddToScope }; 5279 // Fake up an access specifier if it's supposed to be a class member. 5280 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5281 NewFD->setAccess(AS_public); 5282 5283 // Qualified decls generally require a previous declaration. 5284 if (D.getCXXScopeSpec().isSet()) { 5285 // ...with the major exception of templated-scope or 5286 // dependent-scope friend declarations. 5287 5288 // TODO: we currently also suppress this check in dependent 5289 // contexts because (1) the parameter depth will be off when 5290 // matching friend templates and (2) we might actually be 5291 // selecting a friend based on a dependent factor. But there 5292 // are situations where these conditions don't apply and we 5293 // can actually do this check immediately. 5294 if (isFriend && 5295 (TemplateParamLists.size() || 5296 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5297 CurContext->isDependentContext())) { 5298 // ignore these 5299 } else { 5300 // The user tried to provide an out-of-line definition for a 5301 // function that is a member of a class or namespace, but there 5302 // was no such member function declared (C++ [class.mfct]p2, 5303 // C++ [namespace.memdef]p2). For example: 5304 // 5305 // class X { 5306 // void f() const; 5307 // }; 5308 // 5309 // void X::f() { } // ill-formed 5310 // 5311 // Complain about this problem, and attempt to suggest close 5312 // matches (e.g., those that differ only in cv-qualifiers and 5313 // whether the parameter types are references). 5314 5315 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5316 NewFD, 5317 ExtraArgs)) { 5318 AddToScope = ExtraArgs.AddToScope; 5319 return Result; 5320 } 5321 } 5322 5323 // Unqualified local friend declarations are required to resolve 5324 // to something. 5325 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5326 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5327 NewFD, 5328 ExtraArgs)) { 5329 AddToScope = ExtraArgs.AddToScope; 5330 return Result; 5331 } 5332 } 5333 5334 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5335 !isFriend && !isFunctionTemplateSpecialization && 5336 !isExplicitSpecialization) { 5337 // An out-of-line member function declaration must also be a 5338 // definition (C++ [dcl.meaning]p1). 5339 // Note that this is not the case for explicit specializations of 5340 // function templates or member functions of class templates, per 5341 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5342 // extension for compatibility with old SWIG code which likes to 5343 // generate them. 5344 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5345 << D.getCXXScopeSpec().getRange(); 5346 } 5347 } 5348 5349 5350 // Handle attributes. We need to have merged decls when handling attributes 5351 // (for example to check for conflicts, etc). 5352 // FIXME: This needs to happen before we merge declarations. Then, 5353 // let attribute merging cope with attribute conflicts. 5354 ProcessDeclAttributes(S, NewFD, D, 5355 /*NonInheritable=*/false, /*Inheritable=*/true); 5356 5357 // attributes declared post-definition are currently ignored 5358 // FIXME: This should happen during attribute merging 5359 if (D.isRedeclaration() && Previous.isSingleResult()) { 5360 const FunctionDecl *Def; 5361 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5362 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5363 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5364 Diag(Def->getLocation(), diag::note_previous_definition); 5365 } 5366 } 5367 5368 AddKnownFunctionAttributes(NewFD); 5369 5370 if (NewFD->hasAttr<OverloadableAttr>() && 5371 !NewFD->getType()->getAs<FunctionProtoType>()) { 5372 Diag(NewFD->getLocation(), 5373 diag::err_attribute_overloadable_no_prototype) 5374 << NewFD; 5375 5376 // Turn this into a variadic function with no parameters. 5377 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5378 FunctionProtoType::ExtProtoInfo EPI; 5379 EPI.Variadic = true; 5380 EPI.ExtInfo = FT->getExtInfo(); 5381 5382 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5383 NewFD->setType(R); 5384 } 5385 5386 // If there's a #pragma GCC visibility in scope, and this isn't a class 5387 // member, set the visibility of this function. 5388 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5389 AddPushedVisibilityAttribute(NewFD); 5390 5391 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5392 // marking the function. 5393 AddCFAuditedAttribute(NewFD); 5394 5395 // If this is a locally-scoped extern C function, update the 5396 // map of such names. 5397 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5398 && !NewFD->isInvalidDecl()) 5399 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5400 5401 // Set this FunctionDecl's range up to the right paren. 5402 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5403 5404 if (getLangOptions().CPlusPlus) { 5405 if (FunctionTemplate) { 5406 if (NewFD->isInvalidDecl()) 5407 FunctionTemplate->setInvalidDecl(); 5408 return FunctionTemplate; 5409 } 5410 } 5411 5412 MarkUnusedFileScopedDecl(NewFD); 5413 5414 if (getLangOptions().CUDA) 5415 if (IdentifierInfo *II = NewFD->getIdentifier()) 5416 if (!NewFD->isInvalidDecl() && 5417 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5418 if (II->isStr("cudaConfigureCall")) { 5419 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5420 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5421 5422 Context.setcudaConfigureCallDecl(NewFD); 5423 } 5424 } 5425 5426 // Here we have an function template explicit specialization at class scope. 5427 // The actually specialization will be postponed to template instatiation 5428 // time via the ClassScopeFunctionSpecializationDecl node. 5429 if (isDependentClassScopeExplicitSpecialization) { 5430 ClassScopeFunctionSpecializationDecl *NewSpec = 5431 ClassScopeFunctionSpecializationDecl::Create( 5432 Context, CurContext, SourceLocation(), 5433 cast<CXXMethodDecl>(NewFD)); 5434 CurContext->addDecl(NewSpec); 5435 AddToScope = false; 5436 } 5437 5438 return NewFD; 5439} 5440 5441/// \brief Perform semantic checking of a new function declaration. 5442/// 5443/// Performs semantic analysis of the new function declaration 5444/// NewFD. This routine performs all semantic checking that does not 5445/// require the actual declarator involved in the declaration, and is 5446/// used both for the declaration of functions as they are parsed 5447/// (called via ActOnDeclarator) and for the declaration of functions 5448/// that have been instantiated via C++ template instantiation (called 5449/// via InstantiateDecl). 5450/// 5451/// \param IsExplicitSpecialiation whether this new function declaration is 5452/// an explicit specialization of the previous declaration. 5453/// 5454/// This sets NewFD->isInvalidDecl() to true if there was an error. 5455/// 5456/// Returns true if the function declaration is a redeclaration. 5457bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5458 LookupResult &Previous, 5459 bool IsExplicitSpecialization) { 5460 assert(!NewFD->getResultType()->isVariablyModifiedType() 5461 && "Variably modified return types are not handled here"); 5462 5463 // Check for a previous declaration of this name. 5464 if (Previous.empty() && NewFD->isExternC()) { 5465 // Since we did not find anything by this name and we're declaring 5466 // an extern "C" function, look for a non-visible extern "C" 5467 // declaration with the same name. 5468 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5469 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5470 if (Pos != LocallyScopedExternalDecls.end()) 5471 Previous.addDecl(Pos->second); 5472 } 5473 5474 bool Redeclaration = false; 5475 5476 // Merge or overload the declaration with an existing declaration of 5477 // the same name, if appropriate. 5478 if (!Previous.empty()) { 5479 // Determine whether NewFD is an overload of PrevDecl or 5480 // a declaration that requires merging. If it's an overload, 5481 // there's no more work to do here; we'll just add the new 5482 // function to the scope. 5483 5484 NamedDecl *OldDecl = 0; 5485 if (!AllowOverloadingOfFunction(Previous, Context)) { 5486 Redeclaration = true; 5487 OldDecl = Previous.getFoundDecl(); 5488 } else { 5489 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5490 /*NewIsUsingDecl*/ false)) { 5491 case Ovl_Match: 5492 Redeclaration = true; 5493 break; 5494 5495 case Ovl_NonFunction: 5496 Redeclaration = true; 5497 break; 5498 5499 case Ovl_Overload: 5500 Redeclaration = false; 5501 break; 5502 } 5503 5504 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5505 // If a function name is overloadable in C, then every function 5506 // with that name must be marked "overloadable". 5507 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5508 << Redeclaration << NewFD; 5509 NamedDecl *OverloadedDecl = 0; 5510 if (Redeclaration) 5511 OverloadedDecl = OldDecl; 5512 else if (!Previous.empty()) 5513 OverloadedDecl = Previous.getRepresentativeDecl(); 5514 if (OverloadedDecl) 5515 Diag(OverloadedDecl->getLocation(), 5516 diag::note_attribute_overloadable_prev_overload); 5517 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5518 Context)); 5519 } 5520 } 5521 5522 if (Redeclaration) { 5523 // NewFD and OldDecl represent declarations that need to be 5524 // merged. 5525 if (MergeFunctionDecl(NewFD, OldDecl)) { 5526 NewFD->setInvalidDecl(); 5527 return Redeclaration; 5528 } 5529 5530 Previous.clear(); 5531 Previous.addDecl(OldDecl); 5532 5533 if (FunctionTemplateDecl *OldTemplateDecl 5534 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5535 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5536 FunctionTemplateDecl *NewTemplateDecl 5537 = NewFD->getDescribedFunctionTemplate(); 5538 assert(NewTemplateDecl && "Template/non-template mismatch"); 5539 if (CXXMethodDecl *Method 5540 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5541 Method->setAccess(OldTemplateDecl->getAccess()); 5542 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5543 } 5544 5545 // If this is an explicit specialization of a member that is a function 5546 // template, mark it as a member specialization. 5547 if (IsExplicitSpecialization && 5548 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5549 NewTemplateDecl->setMemberSpecialization(); 5550 assert(OldTemplateDecl->isMemberSpecialization()); 5551 } 5552 5553 if (OldTemplateDecl->isModulePrivate()) 5554 NewTemplateDecl->setModulePrivate(); 5555 5556 } else { 5557 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5558 NewFD->setAccess(OldDecl->getAccess()); 5559 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5560 } 5561 } 5562 } 5563 5564 // Semantic checking for this function declaration (in isolation). 5565 if (getLangOptions().CPlusPlus) { 5566 // C++-specific checks. 5567 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5568 CheckConstructor(Constructor); 5569 } else if (CXXDestructorDecl *Destructor = 5570 dyn_cast<CXXDestructorDecl>(NewFD)) { 5571 CXXRecordDecl *Record = Destructor->getParent(); 5572 QualType ClassType = Context.getTypeDeclType(Record); 5573 5574 // FIXME: Shouldn't we be able to perform this check even when the class 5575 // type is dependent? Both gcc and edg can handle that. 5576 if (!ClassType->isDependentType()) { 5577 DeclarationName Name 5578 = Context.DeclarationNames.getCXXDestructorName( 5579 Context.getCanonicalType(ClassType)); 5580 if (NewFD->getDeclName() != Name) { 5581 Diag(NewFD->getLocation(), diag::err_destructor_name); 5582 NewFD->setInvalidDecl(); 5583 return Redeclaration; 5584 } 5585 } 5586 } else if (CXXConversionDecl *Conversion 5587 = dyn_cast<CXXConversionDecl>(NewFD)) { 5588 ActOnConversionDeclarator(Conversion); 5589 } 5590 5591 // Find any virtual functions that this function overrides. 5592 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5593 if (!Method->isFunctionTemplateSpecialization() && 5594 !Method->getDescribedFunctionTemplate()) { 5595 if (AddOverriddenMethods(Method->getParent(), Method)) { 5596 // If the function was marked as "static", we have a problem. 5597 if (NewFD->getStorageClass() == SC_Static) { 5598 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5599 << NewFD->getDeclName(); 5600 for (CXXMethodDecl::method_iterator 5601 Overridden = Method->begin_overridden_methods(), 5602 OverriddenEnd = Method->end_overridden_methods(); 5603 Overridden != OverriddenEnd; 5604 ++Overridden) { 5605 Diag((*Overridden)->getLocation(), 5606 diag::note_overridden_virtual_function); 5607 } 5608 } 5609 } 5610 } 5611 } 5612 5613 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5614 if (NewFD->isOverloadedOperator() && 5615 CheckOverloadedOperatorDeclaration(NewFD)) { 5616 NewFD->setInvalidDecl(); 5617 return Redeclaration; 5618 } 5619 5620 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5621 if (NewFD->getLiteralIdentifier() && 5622 CheckLiteralOperatorDeclaration(NewFD)) { 5623 NewFD->setInvalidDecl(); 5624 return Redeclaration; 5625 } 5626 5627 // In C++, check default arguments now that we have merged decls. Unless 5628 // the lexical context is the class, because in this case this is done 5629 // during delayed parsing anyway. 5630 if (!CurContext->isRecord()) 5631 CheckCXXDefaultArguments(NewFD); 5632 5633 // If this function declares a builtin function, check the type of this 5634 // declaration against the expected type for the builtin. 5635 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5636 ASTContext::GetBuiltinTypeError Error; 5637 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5638 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5639 // The type of this function differs from the type of the builtin, 5640 // so forget about the builtin entirely. 5641 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5642 } 5643 } 5644 } 5645 return Redeclaration; 5646} 5647 5648void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5649 // C++ [basic.start.main]p3: A program that declares main to be inline 5650 // or static is ill-formed. 5651 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5652 // shall not appear in a declaration of main. 5653 // static main is not an error under C99, but we should warn about it. 5654 if (FD->getStorageClass() == SC_Static) 5655 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5656 ? diag::err_static_main : diag::warn_static_main) 5657 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5658 if (FD->isInlineSpecified()) 5659 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5660 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5661 5662 QualType T = FD->getType(); 5663 assert(T->isFunctionType() && "function decl is not of function type"); 5664 const FunctionType* FT = T->getAs<FunctionType>(); 5665 5666 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5667 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5668 FD->setInvalidDecl(true); 5669 } 5670 5671 // Treat protoless main() as nullary. 5672 if (isa<FunctionNoProtoType>(FT)) return; 5673 5674 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5675 unsigned nparams = FTP->getNumArgs(); 5676 assert(FD->getNumParams() == nparams); 5677 5678 bool HasExtraParameters = (nparams > 3); 5679 5680 // Darwin passes an undocumented fourth argument of type char**. If 5681 // other platforms start sprouting these, the logic below will start 5682 // getting shifty. 5683 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5684 HasExtraParameters = false; 5685 5686 if (HasExtraParameters) { 5687 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5688 FD->setInvalidDecl(true); 5689 nparams = 3; 5690 } 5691 5692 // FIXME: a lot of the following diagnostics would be improved 5693 // if we had some location information about types. 5694 5695 QualType CharPP = 5696 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5697 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5698 5699 for (unsigned i = 0; i < nparams; ++i) { 5700 QualType AT = FTP->getArgType(i); 5701 5702 bool mismatch = true; 5703 5704 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5705 mismatch = false; 5706 else if (Expected[i] == CharPP) { 5707 // As an extension, the following forms are okay: 5708 // char const ** 5709 // char const * const * 5710 // char * const * 5711 5712 QualifierCollector qs; 5713 const PointerType* PT; 5714 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5715 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5716 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5717 qs.removeConst(); 5718 mismatch = !qs.empty(); 5719 } 5720 } 5721 5722 if (mismatch) { 5723 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5724 // TODO: suggest replacing given type with expected type 5725 FD->setInvalidDecl(true); 5726 } 5727 } 5728 5729 if (nparams == 1 && !FD->isInvalidDecl()) { 5730 Diag(FD->getLocation(), diag::warn_main_one_arg); 5731 } 5732 5733 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5734 Diag(FD->getLocation(), diag::err_main_template_decl); 5735 FD->setInvalidDecl(); 5736 } 5737} 5738 5739bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5740 // FIXME: Need strict checking. In C89, we need to check for 5741 // any assignment, increment, decrement, function-calls, or 5742 // commas outside of a sizeof. In C99, it's the same list, 5743 // except that the aforementioned are allowed in unevaluated 5744 // expressions. Everything else falls under the 5745 // "may accept other forms of constant expressions" exception. 5746 // (We never end up here for C++, so the constant expression 5747 // rules there don't matter.) 5748 if (Init->isConstantInitializer(Context, false)) 5749 return false; 5750 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5751 << Init->getSourceRange(); 5752 return true; 5753} 5754 5755namespace { 5756 // Visits an initialization expression to see if OrigDecl is evaluated in 5757 // its own initialization and throws a warning if it does. 5758 class SelfReferenceChecker 5759 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5760 Sema &S; 5761 Decl *OrigDecl; 5762 bool isRecordType; 5763 bool isPODType; 5764 5765 public: 5766 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5767 5768 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5769 S(S), OrigDecl(OrigDecl) { 5770 isPODType = false; 5771 isRecordType = false; 5772 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5773 isPODType = VD->getType().isPODType(S.Context); 5774 isRecordType = VD->getType()->isRecordType(); 5775 } 5776 } 5777 5778 void VisitExpr(Expr *E) { 5779 if (isa<ObjCMessageExpr>(*E)) return; 5780 if (isRecordType) { 5781 Expr *expr = E; 5782 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5783 ValueDecl *VD = ME->getMemberDecl(); 5784 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5785 expr = ME->getBase(); 5786 } 5787 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5788 HandleDeclRefExpr(DRE); 5789 return; 5790 } 5791 } 5792 Inherited::VisitExpr(E); 5793 } 5794 5795 void VisitMemberExpr(MemberExpr *E) { 5796 if (E->getType()->canDecayToPointerType()) return; 5797 if (isa<FieldDecl>(E->getMemberDecl())) 5798 if (DeclRefExpr *DRE 5799 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5800 HandleDeclRefExpr(DRE); 5801 return; 5802 } 5803 Inherited::VisitMemberExpr(E); 5804 } 5805 5806 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5807 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5808 (isRecordType && E->getCastKind() == CK_NoOp)) { 5809 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5810 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5811 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5812 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5813 HandleDeclRefExpr(DRE); 5814 return; 5815 } 5816 } 5817 Inherited::VisitImplicitCastExpr(E); 5818 } 5819 5820 void VisitUnaryOperator(UnaryOperator *E) { 5821 // For POD record types, addresses of its own members are well-defined. 5822 if (isRecordType && isPODType) return; 5823 Inherited::VisitUnaryOperator(E); 5824 } 5825 5826 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5827 Decl* ReferenceDecl = DRE->getDecl(); 5828 if (OrigDecl != ReferenceDecl) return; 5829 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5830 Sema::NotForRedeclaration); 5831 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5832 S.PDiag(diag::warn_uninit_self_reference_in_init) 5833 << Result.getLookupName() 5834 << OrigDecl->getLocation() 5835 << DRE->getSourceRange()); 5836 } 5837 }; 5838} 5839 5840/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5841void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5842 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5843} 5844 5845/// AddInitializerToDecl - Adds the initializer Init to the 5846/// declaration dcl. If DirectInit is true, this is C++ direct 5847/// initialization rather than copy initialization. 5848void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5849 bool DirectInit, bool TypeMayContainAuto) { 5850 // If there is no declaration, there was an error parsing it. Just ignore 5851 // the initializer. 5852 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5853 return; 5854 5855 // Check for self-references within variable initializers. 5856 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5857 // Variables declared within a function/method body are handled 5858 // by a dataflow analysis. 5859 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5860 CheckSelfReference(RealDecl, Init); 5861 } 5862 else { 5863 CheckSelfReference(RealDecl, Init); 5864 } 5865 5866 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5867 // With declarators parsed the way they are, the parser cannot 5868 // distinguish between a normal initializer and a pure-specifier. 5869 // Thus this grotesque test. 5870 IntegerLiteral *IL; 5871 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5872 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5873 CheckPureMethod(Method, Init->getSourceRange()); 5874 else { 5875 Diag(Method->getLocation(), diag::err_member_function_initialization) 5876 << Method->getDeclName() << Init->getSourceRange(); 5877 Method->setInvalidDecl(); 5878 } 5879 return; 5880 } 5881 5882 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5883 if (!VDecl) { 5884 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5885 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5886 RealDecl->setInvalidDecl(); 5887 return; 5888 } 5889 5890 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5891 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5892 TypeSourceInfo *DeducedType = 0; 5893 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5894 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5895 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5896 << Init->getSourceRange(); 5897 if (!DeducedType) { 5898 RealDecl->setInvalidDecl(); 5899 return; 5900 } 5901 VDecl->setTypeSourceInfo(DeducedType); 5902 VDecl->setType(DeducedType->getType()); 5903 5904 // In ARC, infer lifetime. 5905 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5906 VDecl->setInvalidDecl(); 5907 5908 // If this is a redeclaration, check that the type we just deduced matches 5909 // the previously declared type. 5910 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5911 MergeVarDeclTypes(VDecl, Old); 5912 } 5913 5914 5915 // A definition must end up with a complete type, which means it must be 5916 // complete with the restriction that an array type might be completed by the 5917 // initializer; note that later code assumes this restriction. 5918 QualType BaseDeclType = VDecl->getType(); 5919 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5920 BaseDeclType = Array->getElementType(); 5921 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5922 diag::err_typecheck_decl_incomplete_type)) { 5923 RealDecl->setInvalidDecl(); 5924 return; 5925 } 5926 5927 // The variable can not have an abstract class type. 5928 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5929 diag::err_abstract_type_in_decl, 5930 AbstractVariableType)) 5931 VDecl->setInvalidDecl(); 5932 5933 const VarDecl *Def; 5934 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5935 Diag(VDecl->getLocation(), diag::err_redefinition) 5936 << VDecl->getDeclName(); 5937 Diag(Def->getLocation(), diag::note_previous_definition); 5938 VDecl->setInvalidDecl(); 5939 return; 5940 } 5941 5942 const VarDecl* PrevInit = 0; 5943 if (getLangOptions().CPlusPlus) { 5944 // C++ [class.static.data]p4 5945 // If a static data member is of const integral or const 5946 // enumeration type, its declaration in the class definition can 5947 // specify a constant-initializer which shall be an integral 5948 // constant expression (5.19). In that case, the member can appear 5949 // in integral constant expressions. The member shall still be 5950 // defined in a namespace scope if it is used in the program and the 5951 // namespace scope definition shall not contain an initializer. 5952 // 5953 // We already performed a redefinition check above, but for static 5954 // data members we also need to check whether there was an in-class 5955 // declaration with an initializer. 5956 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5957 Diag(VDecl->getLocation(), diag::err_redefinition) 5958 << VDecl->getDeclName(); 5959 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5960 return; 5961 } 5962 5963 if (VDecl->hasLocalStorage()) 5964 getCurFunction()->setHasBranchProtectedScope(); 5965 5966 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5967 VDecl->setInvalidDecl(); 5968 return; 5969 } 5970 } 5971 5972 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5973 // a kernel function cannot be initialized." 5974 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5975 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5976 VDecl->setInvalidDecl(); 5977 return; 5978 } 5979 5980 // Capture the variable that is being initialized and the style of 5981 // initialization. 5982 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5983 5984 // FIXME: Poor source location information. 5985 InitializationKind Kind 5986 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5987 Init->getLocStart(), 5988 Init->getLocEnd()) 5989 : InitializationKind::CreateCopy(VDecl->getLocation(), 5990 Init->getLocStart()); 5991 5992 // Get the decls type and save a reference for later, since 5993 // CheckInitializerTypes may change it. 5994 QualType DclT = VDecl->getType(), SavT = DclT; 5995 if (VDecl->isLocalVarDecl()) { 5996 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5997 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5998 VDecl->setInvalidDecl(); 5999 } else if (!VDecl->isInvalidDecl()) { 6000 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6001 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6002 MultiExprArg(*this, &Init, 1), 6003 &DclT); 6004 if (Result.isInvalid()) { 6005 VDecl->setInvalidDecl(); 6006 return; 6007 } 6008 6009 Init = Result.takeAs<Expr>(); 6010 6011 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6012 // Don't check invalid declarations to avoid emitting useless diagnostics. 6013 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6014 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6015 CheckForConstantInitializer(Init, DclT); 6016 } 6017 } 6018 } else if (VDecl->isStaticDataMember() && 6019 VDecl->getLexicalDeclContext()->isRecord()) { 6020 // This is an in-class initialization for a static data member, e.g., 6021 // 6022 // struct S { 6023 // static const int value = 17; 6024 // }; 6025 6026 // Try to perform the initialization regardless. 6027 if (!VDecl->isInvalidDecl()) { 6028 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6029 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6030 MultiExprArg(*this, &Init, 1), 6031 &DclT); 6032 if (Result.isInvalid()) { 6033 VDecl->setInvalidDecl(); 6034 return; 6035 } 6036 6037 Init = Result.takeAs<Expr>(); 6038 } 6039 6040 // C++ [class.mem]p4: 6041 // A member-declarator can contain a constant-initializer only 6042 // if it declares a static member (9.4) of const integral or 6043 // const enumeration type, see 9.4.2. 6044 // 6045 // C++0x [class.static.data]p3: 6046 // If a non-volatile const static data member is of integral or 6047 // enumeration type, its declaration in the class definition can 6048 // specify a brace-or-equal-initializer in which every initalizer-clause 6049 // that is an assignment-expression is a constant expression. A static 6050 // data member of literal type can be declared in the class definition 6051 // with the constexpr specifier; if so, its declaration shall specify a 6052 // brace-or-equal-initializer in which every initializer-clause that is 6053 // an assignment-expression is a constant expression. 6054 QualType T = VDecl->getType(); 6055 6056 // Do nothing on dependent types. 6057 if (T->isDependentType()) { 6058 6059 // Allow any 'static constexpr' members, whether or not they are of literal 6060 // type. We separately check that the initializer is a constant expression, 6061 // which implicitly requires the member to be of literal type. 6062 } else if (VDecl->isConstexpr()) { 6063 6064 // Require constness. 6065 } else if (!T.isConstQualified()) { 6066 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6067 << Init->getSourceRange(); 6068 VDecl->setInvalidDecl(); 6069 6070 // We allow integer constant expressions in all cases. 6071 } else if (T->isIntegralOrEnumerationType()) { 6072 // Check whether the expression is a constant expression. 6073 SourceLocation Loc; 6074 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6075 // In C++0x, a non-constexpr const static data member with an 6076 // in-class initializer cannot be volatile. 6077 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6078 else if (Init->isValueDependent()) 6079 ; // Nothing to check. 6080 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6081 ; // Ok, it's an ICE! 6082 else if (Init->isEvaluatable(Context)) { 6083 // If we can constant fold the initializer through heroics, accept it, 6084 // but report this as a use of an extension for -pedantic. 6085 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6086 << Init->getSourceRange(); 6087 } else { 6088 // Otherwise, this is some crazy unknown case. Report the issue at the 6089 // location provided by the isIntegerConstantExpr failed check. 6090 Diag(Loc, diag::err_in_class_initializer_non_constant) 6091 << Init->getSourceRange(); 6092 VDecl->setInvalidDecl(); 6093 } 6094 6095 // We allow floating-point constants as an extension. 6096 } else if (T->isFloatingType()) { // also permits complex, which is ok 6097 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6098 << T << Init->getSourceRange(); 6099 if (getLangOptions().CPlusPlus0x) 6100 Diag(VDecl->getLocation(), 6101 diag::note_in_class_initializer_float_type_constexpr) 6102 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6103 6104 if (!Init->isValueDependent() && 6105 !Init->isConstantInitializer(Context, false)) { 6106 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6107 << Init->getSourceRange(); 6108 VDecl->setInvalidDecl(); 6109 } 6110 6111 // Suggest adding 'constexpr' in C++0x for literal types. 6112 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6113 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6114 << T << Init->getSourceRange() 6115 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6116 VDecl->setConstexpr(true); 6117 6118 } else { 6119 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6120 << T << Init->getSourceRange(); 6121 VDecl->setInvalidDecl(); 6122 } 6123 } else if (VDecl->isFileVarDecl()) { 6124 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6125 (!getLangOptions().CPlusPlus || 6126 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6127 Diag(VDecl->getLocation(), diag::warn_extern_init); 6128 if (!VDecl->isInvalidDecl()) { 6129 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6130 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6131 MultiExprArg(*this, &Init, 1), 6132 &DclT); 6133 if (Result.isInvalid()) { 6134 VDecl->setInvalidDecl(); 6135 return; 6136 } 6137 6138 Init = Result.takeAs<Expr>(); 6139 } 6140 6141 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6142 // Don't check invalid declarations to avoid emitting useless diagnostics. 6143 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6144 // C99 6.7.8p4. All file scoped initializers need to be constant. 6145 CheckForConstantInitializer(Init, DclT); 6146 } 6147 } 6148 // If the type changed, it means we had an incomplete type that was 6149 // completed by the initializer. For example: 6150 // int ary[] = { 1, 3, 5 }; 6151 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6152 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6153 VDecl->setType(DclT); 6154 Init->setType(DclT); 6155 } 6156 6157 // Check any implicit conversions within the expression. 6158 CheckImplicitConversions(Init, VDecl->getLocation()); 6159 6160 if (!VDecl->isInvalidDecl()) 6161 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6162 6163 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6164 !VDecl->getType()->isDependentType() && 6165 !Init->isTypeDependent() && !Init->isValueDependent() && 6166 !Init->isConstantInitializer(Context, 6167 VDecl->getType()->isReferenceType())) { 6168 // FIXME: Improve this diagnostic to explain why the initializer is not 6169 // a constant expression. 6170 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6171 << VDecl << Init->getSourceRange(); 6172 } 6173 6174 Init = MaybeCreateExprWithCleanups(Init); 6175 // Attach the initializer to the decl. 6176 VDecl->setInit(Init); 6177 6178 CheckCompleteVariableDeclaration(VDecl); 6179} 6180 6181/// ActOnInitializerError - Given that there was an error parsing an 6182/// initializer for the given declaration, try to return to some form 6183/// of sanity. 6184void Sema::ActOnInitializerError(Decl *D) { 6185 // Our main concern here is re-establishing invariants like "a 6186 // variable's type is either dependent or complete". 6187 if (!D || D->isInvalidDecl()) return; 6188 6189 VarDecl *VD = dyn_cast<VarDecl>(D); 6190 if (!VD) return; 6191 6192 // Auto types are meaningless if we can't make sense of the initializer. 6193 if (ParsingInitForAutoVars.count(D)) { 6194 D->setInvalidDecl(); 6195 return; 6196 } 6197 6198 QualType Ty = VD->getType(); 6199 if (Ty->isDependentType()) return; 6200 6201 // Require a complete type. 6202 if (RequireCompleteType(VD->getLocation(), 6203 Context.getBaseElementType(Ty), 6204 diag::err_typecheck_decl_incomplete_type)) { 6205 VD->setInvalidDecl(); 6206 return; 6207 } 6208 6209 // Require an abstract type. 6210 if (RequireNonAbstractType(VD->getLocation(), Ty, 6211 diag::err_abstract_type_in_decl, 6212 AbstractVariableType)) { 6213 VD->setInvalidDecl(); 6214 return; 6215 } 6216 6217 // Don't bother complaining about constructors or destructors, 6218 // though. 6219} 6220 6221void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6222 bool TypeMayContainAuto) { 6223 // If there is no declaration, there was an error parsing it. Just ignore it. 6224 if (RealDecl == 0) 6225 return; 6226 6227 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6228 QualType Type = Var->getType(); 6229 6230 // C++0x [dcl.spec.auto]p3 6231 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6232 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6233 << Var->getDeclName() << Type; 6234 Var->setInvalidDecl(); 6235 return; 6236 } 6237 6238 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6239 // have an initializer. 6240 // C++0x [class.static.data]p3: A static data member can be declared with 6241 // the constexpr specifier; if so, its declaration shall specify 6242 // a brace-or-equal-initializer. 6243 // 6244 // A static data member's definition may inherit an initializer from an 6245 // in-class declaration. 6246 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6247 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6248 << Var->getDeclName(); 6249 Var->setInvalidDecl(); 6250 return; 6251 } 6252 6253 switch (Var->isThisDeclarationADefinition()) { 6254 case VarDecl::Definition: 6255 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6256 break; 6257 6258 // We have an out-of-line definition of a static data member 6259 // that has an in-class initializer, so we type-check this like 6260 // a declaration. 6261 // 6262 // Fall through 6263 6264 case VarDecl::DeclarationOnly: 6265 // It's only a declaration. 6266 6267 // Block scope. C99 6.7p7: If an identifier for an object is 6268 // declared with no linkage (C99 6.2.2p6), the type for the 6269 // object shall be complete. 6270 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6271 !Var->getLinkage() && !Var->isInvalidDecl() && 6272 RequireCompleteType(Var->getLocation(), Type, 6273 diag::err_typecheck_decl_incomplete_type)) 6274 Var->setInvalidDecl(); 6275 6276 // Make sure that the type is not abstract. 6277 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6278 RequireNonAbstractType(Var->getLocation(), Type, 6279 diag::err_abstract_type_in_decl, 6280 AbstractVariableType)) 6281 Var->setInvalidDecl(); 6282 return; 6283 6284 case VarDecl::TentativeDefinition: 6285 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6286 // object that has file scope without an initializer, and without a 6287 // storage-class specifier or with the storage-class specifier "static", 6288 // constitutes a tentative definition. Note: A tentative definition with 6289 // external linkage is valid (C99 6.2.2p5). 6290 if (!Var->isInvalidDecl()) { 6291 if (const IncompleteArrayType *ArrayT 6292 = Context.getAsIncompleteArrayType(Type)) { 6293 if (RequireCompleteType(Var->getLocation(), 6294 ArrayT->getElementType(), 6295 diag::err_illegal_decl_array_incomplete_type)) 6296 Var->setInvalidDecl(); 6297 } else if (Var->getStorageClass() == SC_Static) { 6298 // C99 6.9.2p3: If the declaration of an identifier for an object is 6299 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6300 // declared type shall not be an incomplete type. 6301 // NOTE: code such as the following 6302 // static struct s; 6303 // struct s { int a; }; 6304 // is accepted by gcc. Hence here we issue a warning instead of 6305 // an error and we do not invalidate the static declaration. 6306 // NOTE: to avoid multiple warnings, only check the first declaration. 6307 if (Var->getPreviousDeclaration() == 0) 6308 RequireCompleteType(Var->getLocation(), Type, 6309 diag::ext_typecheck_decl_incomplete_type); 6310 } 6311 } 6312 6313 // Record the tentative definition; we're done. 6314 if (!Var->isInvalidDecl()) 6315 TentativeDefinitions.push_back(Var); 6316 return; 6317 } 6318 6319 // Provide a specific diagnostic for uninitialized variable 6320 // definitions with incomplete array type. 6321 if (Type->isIncompleteArrayType()) { 6322 Diag(Var->getLocation(), 6323 diag::err_typecheck_incomplete_array_needs_initializer); 6324 Var->setInvalidDecl(); 6325 return; 6326 } 6327 6328 // Provide a specific diagnostic for uninitialized variable 6329 // definitions with reference type. 6330 if (Type->isReferenceType()) { 6331 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6332 << Var->getDeclName() 6333 << SourceRange(Var->getLocation(), Var->getLocation()); 6334 Var->setInvalidDecl(); 6335 return; 6336 } 6337 6338 // Do not attempt to type-check the default initializer for a 6339 // variable with dependent type. 6340 if (Type->isDependentType()) 6341 return; 6342 6343 if (Var->isInvalidDecl()) 6344 return; 6345 6346 if (RequireCompleteType(Var->getLocation(), 6347 Context.getBaseElementType(Type), 6348 diag::err_typecheck_decl_incomplete_type)) { 6349 Var->setInvalidDecl(); 6350 return; 6351 } 6352 6353 // The variable can not have an abstract class type. 6354 if (RequireNonAbstractType(Var->getLocation(), Type, 6355 diag::err_abstract_type_in_decl, 6356 AbstractVariableType)) { 6357 Var->setInvalidDecl(); 6358 return; 6359 } 6360 6361 // Check for jumps past the implicit initializer. C++0x 6362 // clarifies that this applies to a "variable with automatic 6363 // storage duration", not a "local variable". 6364 // C++11 [stmt.dcl]p3 6365 // A program that jumps from a point where a variable with automatic 6366 // storage duration is not in scope to a point where it is in scope is 6367 // ill-formed unless the variable has scalar type, class type with a 6368 // trivial default constructor and a trivial destructor, a cv-qualified 6369 // version of one of these types, or an array of one of the preceding 6370 // types and is declared without an initializer. 6371 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6372 if (const RecordType *Record 6373 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6374 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6375 // Mark the function for further checking even if the looser rules of 6376 // C++11 do not require such checks, so that we can diagnose 6377 // incompatibilities with C++98. 6378 if (!CXXRecord->isPOD()) 6379 getCurFunction()->setHasBranchProtectedScope(); 6380 } 6381 } 6382 6383 // C++03 [dcl.init]p9: 6384 // If no initializer is specified for an object, and the 6385 // object is of (possibly cv-qualified) non-POD class type (or 6386 // array thereof), the object shall be default-initialized; if 6387 // the object is of const-qualified type, the underlying class 6388 // type shall have a user-declared default 6389 // constructor. Otherwise, if no initializer is specified for 6390 // a non- static object, the object and its subobjects, if 6391 // any, have an indeterminate initial value); if the object 6392 // or any of its subobjects are of const-qualified type, the 6393 // program is ill-formed. 6394 // C++0x [dcl.init]p11: 6395 // If no initializer is specified for an object, the object is 6396 // default-initialized; [...]. 6397 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6398 InitializationKind Kind 6399 = InitializationKind::CreateDefault(Var->getLocation()); 6400 6401 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6402 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6403 MultiExprArg(*this, 0, 0)); 6404 if (Init.isInvalid()) 6405 Var->setInvalidDecl(); 6406 else if (Init.get()) 6407 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6408 6409 CheckCompleteVariableDeclaration(Var); 6410 } 6411} 6412 6413void Sema::ActOnCXXForRangeDecl(Decl *D) { 6414 VarDecl *VD = dyn_cast<VarDecl>(D); 6415 if (!VD) { 6416 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6417 D->setInvalidDecl(); 6418 return; 6419 } 6420 6421 VD->setCXXForRangeDecl(true); 6422 6423 // for-range-declaration cannot be given a storage class specifier. 6424 int Error = -1; 6425 switch (VD->getStorageClassAsWritten()) { 6426 case SC_None: 6427 break; 6428 case SC_Extern: 6429 Error = 0; 6430 break; 6431 case SC_Static: 6432 Error = 1; 6433 break; 6434 case SC_PrivateExtern: 6435 Error = 2; 6436 break; 6437 case SC_Auto: 6438 Error = 3; 6439 break; 6440 case SC_Register: 6441 Error = 4; 6442 break; 6443 case SC_OpenCLWorkGroupLocal: 6444 llvm_unreachable("Unexpected storage class"); 6445 } 6446 if (VD->isConstexpr()) 6447 Error = 5; 6448 if (Error != -1) { 6449 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6450 << VD->getDeclName() << Error; 6451 D->setInvalidDecl(); 6452 } 6453} 6454 6455void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6456 if (var->isInvalidDecl()) return; 6457 6458 // In ARC, don't allow jumps past the implicit initialization of a 6459 // local retaining variable. 6460 if (getLangOptions().ObjCAutoRefCount && 6461 var->hasLocalStorage()) { 6462 switch (var->getType().getObjCLifetime()) { 6463 case Qualifiers::OCL_None: 6464 case Qualifiers::OCL_ExplicitNone: 6465 case Qualifiers::OCL_Autoreleasing: 6466 break; 6467 6468 case Qualifiers::OCL_Weak: 6469 case Qualifiers::OCL_Strong: 6470 getCurFunction()->setHasBranchProtectedScope(); 6471 break; 6472 } 6473 } 6474 6475 // All the following checks are C++ only. 6476 if (!getLangOptions().CPlusPlus) return; 6477 6478 QualType baseType = Context.getBaseElementType(var->getType()); 6479 if (baseType->isDependentType()) return; 6480 6481 // __block variables might require us to capture a copy-initializer. 6482 if (var->hasAttr<BlocksAttr>()) { 6483 // It's currently invalid to ever have a __block variable with an 6484 // array type; should we diagnose that here? 6485 6486 // Regardless, we don't want to ignore array nesting when 6487 // constructing this copy. 6488 QualType type = var->getType(); 6489 6490 if (type->isStructureOrClassType()) { 6491 SourceLocation poi = var->getLocation(); 6492 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6493 ExprResult result = 6494 PerformCopyInitialization( 6495 InitializedEntity::InitializeBlock(poi, type, false), 6496 poi, Owned(varRef)); 6497 if (!result.isInvalid()) { 6498 result = MaybeCreateExprWithCleanups(result); 6499 Expr *init = result.takeAs<Expr>(); 6500 Context.setBlockVarCopyInits(var, init); 6501 } 6502 } 6503 } 6504 6505 // Check for global constructors. 6506 if (!var->getDeclContext()->isDependentContext() && 6507 var->hasGlobalStorage() && 6508 !var->isStaticLocal() && 6509 var->getInit() && 6510 !var->getInit()->isConstantInitializer(Context, 6511 baseType->isReferenceType())) 6512 Diag(var->getLocation(), diag::warn_global_constructor) 6513 << var->getInit()->getSourceRange(); 6514 6515 // Require the destructor. 6516 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6517 FinalizeVarWithDestructor(var, recordType); 6518} 6519 6520/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6521/// any semantic actions necessary after any initializer has been attached. 6522void 6523Sema::FinalizeDeclaration(Decl *ThisDecl) { 6524 // Note that we are no longer parsing the initializer for this declaration. 6525 ParsingInitForAutoVars.erase(ThisDecl); 6526} 6527 6528Sema::DeclGroupPtrTy 6529Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6530 Decl **Group, unsigned NumDecls) { 6531 SmallVector<Decl*, 8> Decls; 6532 6533 if (DS.isTypeSpecOwned()) 6534 Decls.push_back(DS.getRepAsDecl()); 6535 6536 for (unsigned i = 0; i != NumDecls; ++i) 6537 if (Decl *D = Group[i]) 6538 Decls.push_back(D); 6539 6540 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6541 DS.getTypeSpecType() == DeclSpec::TST_auto); 6542} 6543 6544/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6545/// group, performing any necessary semantic checking. 6546Sema::DeclGroupPtrTy 6547Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6548 bool TypeMayContainAuto) { 6549 // C++0x [dcl.spec.auto]p7: 6550 // If the type deduced for the template parameter U is not the same in each 6551 // deduction, the program is ill-formed. 6552 // FIXME: When initializer-list support is added, a distinction is needed 6553 // between the deduced type U and the deduced type which 'auto' stands for. 6554 // auto a = 0, b = { 1, 2, 3 }; 6555 // is legal because the deduced type U is 'int' in both cases. 6556 if (TypeMayContainAuto && NumDecls > 1) { 6557 QualType Deduced; 6558 CanQualType DeducedCanon; 6559 VarDecl *DeducedDecl = 0; 6560 for (unsigned i = 0; i != NumDecls; ++i) { 6561 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6562 AutoType *AT = D->getType()->getContainedAutoType(); 6563 // Don't reissue diagnostics when instantiating a template. 6564 if (AT && D->isInvalidDecl()) 6565 break; 6566 if (AT && AT->isDeduced()) { 6567 QualType U = AT->getDeducedType(); 6568 CanQualType UCanon = Context.getCanonicalType(U); 6569 if (Deduced.isNull()) { 6570 Deduced = U; 6571 DeducedCanon = UCanon; 6572 DeducedDecl = D; 6573 } else if (DeducedCanon != UCanon) { 6574 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6575 diag::err_auto_different_deductions) 6576 << Deduced << DeducedDecl->getDeclName() 6577 << U << D->getDeclName() 6578 << DeducedDecl->getInit()->getSourceRange() 6579 << D->getInit()->getSourceRange(); 6580 D->setInvalidDecl(); 6581 break; 6582 } 6583 } 6584 } 6585 } 6586 } 6587 6588 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6589} 6590 6591 6592/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6593/// to introduce parameters into function prototype scope. 6594Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6595 const DeclSpec &DS = D.getDeclSpec(); 6596 6597 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6598 // C++03 [dcl.stc]p2 also permits 'auto'. 6599 VarDecl::StorageClass StorageClass = SC_None; 6600 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6601 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6602 StorageClass = SC_Register; 6603 StorageClassAsWritten = SC_Register; 6604 } else if (getLangOptions().CPlusPlus && 6605 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6606 StorageClass = SC_Auto; 6607 StorageClassAsWritten = SC_Auto; 6608 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6609 Diag(DS.getStorageClassSpecLoc(), 6610 diag::err_invalid_storage_class_in_func_decl); 6611 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6612 } 6613 6614 if (D.getDeclSpec().isThreadSpecified()) 6615 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6616 if (D.getDeclSpec().isConstexprSpecified()) 6617 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6618 << 0; 6619 6620 DiagnoseFunctionSpecifiers(D); 6621 6622 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6623 QualType parmDeclType = TInfo->getType(); 6624 6625 if (getLangOptions().CPlusPlus) { 6626 // Check that there are no default arguments inside the type of this 6627 // parameter. 6628 CheckExtraCXXDefaultArguments(D); 6629 6630 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6631 if (D.getCXXScopeSpec().isSet()) { 6632 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6633 << D.getCXXScopeSpec().getRange(); 6634 D.getCXXScopeSpec().clear(); 6635 } 6636 } 6637 6638 // Ensure we have a valid name 6639 IdentifierInfo *II = 0; 6640 if (D.hasName()) { 6641 II = D.getIdentifier(); 6642 if (!II) { 6643 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6644 << GetNameForDeclarator(D).getName().getAsString(); 6645 D.setInvalidType(true); 6646 } 6647 } 6648 6649 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6650 if (II) { 6651 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6652 ForRedeclaration); 6653 LookupName(R, S); 6654 if (R.isSingleResult()) { 6655 NamedDecl *PrevDecl = R.getFoundDecl(); 6656 if (PrevDecl->isTemplateParameter()) { 6657 // Maybe we will complain about the shadowed template parameter. 6658 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6659 // Just pretend that we didn't see the previous declaration. 6660 PrevDecl = 0; 6661 } else if (S->isDeclScope(PrevDecl)) { 6662 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6663 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6664 6665 // Recover by removing the name 6666 II = 0; 6667 D.SetIdentifier(0, D.getIdentifierLoc()); 6668 D.setInvalidType(true); 6669 } 6670 } 6671 } 6672 6673 // Temporarily put parameter variables in the translation unit, not 6674 // the enclosing context. This prevents them from accidentally 6675 // looking like class members in C++. 6676 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6677 D.getSourceRange().getBegin(), 6678 D.getIdentifierLoc(), II, 6679 parmDeclType, TInfo, 6680 StorageClass, StorageClassAsWritten); 6681 6682 if (D.isInvalidType()) 6683 New->setInvalidDecl(); 6684 6685 assert(S->isFunctionPrototypeScope()); 6686 assert(S->getFunctionPrototypeDepth() >= 1); 6687 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6688 S->getNextFunctionPrototypeIndex()); 6689 6690 // Add the parameter declaration into this scope. 6691 S->AddDecl(New); 6692 if (II) 6693 IdResolver.AddDecl(New); 6694 6695 ProcessDeclAttributes(S, New, D); 6696 6697 if (D.getDeclSpec().isModulePrivateSpecified()) 6698 Diag(New->getLocation(), diag::err_module_private_local) 6699 << 1 << New->getDeclName() 6700 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6701 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6702 6703 if (New->hasAttr<BlocksAttr>()) { 6704 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6705 } 6706 return New; 6707} 6708 6709/// \brief Synthesizes a variable for a parameter arising from a 6710/// typedef. 6711ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6712 SourceLocation Loc, 6713 QualType T) { 6714 /* FIXME: setting StartLoc == Loc. 6715 Would it be worth to modify callers so as to provide proper source 6716 location for the unnamed parameters, embedding the parameter's type? */ 6717 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6718 T, Context.getTrivialTypeSourceInfo(T, Loc), 6719 SC_None, SC_None, 0); 6720 Param->setImplicit(); 6721 return Param; 6722} 6723 6724void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6725 ParmVarDecl * const *ParamEnd) { 6726 // Don't diagnose unused-parameter errors in template instantiations; we 6727 // will already have done so in the template itself. 6728 if (!ActiveTemplateInstantiations.empty()) 6729 return; 6730 6731 for (; Param != ParamEnd; ++Param) { 6732 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6733 !(*Param)->hasAttr<UnusedAttr>()) { 6734 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6735 << (*Param)->getDeclName(); 6736 } 6737 } 6738} 6739 6740void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6741 ParmVarDecl * const *ParamEnd, 6742 QualType ReturnTy, 6743 NamedDecl *D) { 6744 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6745 return; 6746 6747 // Warn if the return value is pass-by-value and larger than the specified 6748 // threshold. 6749 if (ReturnTy.isPODType(Context)) { 6750 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6751 if (Size > LangOpts.NumLargeByValueCopy) 6752 Diag(D->getLocation(), diag::warn_return_value_size) 6753 << D->getDeclName() << Size; 6754 } 6755 6756 // Warn if any parameter is pass-by-value and larger than the specified 6757 // threshold. 6758 for (; Param != ParamEnd; ++Param) { 6759 QualType T = (*Param)->getType(); 6760 if (!T.isPODType(Context)) 6761 continue; 6762 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6763 if (Size > LangOpts.NumLargeByValueCopy) 6764 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6765 << (*Param)->getDeclName() << Size; 6766 } 6767} 6768 6769ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6770 SourceLocation NameLoc, IdentifierInfo *Name, 6771 QualType T, TypeSourceInfo *TSInfo, 6772 VarDecl::StorageClass StorageClass, 6773 VarDecl::StorageClass StorageClassAsWritten) { 6774 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6775 if (getLangOptions().ObjCAutoRefCount && 6776 T.getObjCLifetime() == Qualifiers::OCL_None && 6777 T->isObjCLifetimeType()) { 6778 6779 Qualifiers::ObjCLifetime lifetime; 6780 6781 // Special cases for arrays: 6782 // - if it's const, use __unsafe_unretained 6783 // - otherwise, it's an error 6784 if (T->isArrayType()) { 6785 if (!T.isConstQualified()) { 6786 DelayedDiagnostics.add( 6787 sema::DelayedDiagnostic::makeForbiddenType( 6788 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6789 } 6790 lifetime = Qualifiers::OCL_ExplicitNone; 6791 } else { 6792 lifetime = T->getObjCARCImplicitLifetime(); 6793 } 6794 T = Context.getLifetimeQualifiedType(T, lifetime); 6795 } 6796 6797 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6798 Context.getAdjustedParameterType(T), 6799 TSInfo, 6800 StorageClass, StorageClassAsWritten, 6801 0); 6802 6803 // Parameters can not be abstract class types. 6804 // For record types, this is done by the AbstractClassUsageDiagnoser once 6805 // the class has been completely parsed. 6806 if (!CurContext->isRecord() && 6807 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6808 AbstractParamType)) 6809 New->setInvalidDecl(); 6810 6811 // Parameter declarators cannot be interface types. All ObjC objects are 6812 // passed by reference. 6813 if (T->isObjCObjectType()) { 6814 Diag(NameLoc, 6815 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6816 << FixItHint::CreateInsertion(NameLoc, "*"); 6817 T = Context.getObjCObjectPointerType(T); 6818 New->setType(T); 6819 } 6820 6821 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6822 // duration shall not be qualified by an address-space qualifier." 6823 // Since all parameters have automatic store duration, they can not have 6824 // an address space. 6825 if (T.getAddressSpace() != 0) { 6826 Diag(NameLoc, diag::err_arg_with_address_space); 6827 New->setInvalidDecl(); 6828 } 6829 6830 return New; 6831} 6832 6833void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6834 SourceLocation LocAfterDecls) { 6835 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6836 6837 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6838 // for a K&R function. 6839 if (!FTI.hasPrototype) { 6840 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6841 --i; 6842 if (FTI.ArgInfo[i].Param == 0) { 6843 llvm::SmallString<256> Code; 6844 llvm::raw_svector_ostream(Code) << " int " 6845 << FTI.ArgInfo[i].Ident->getName() 6846 << ";\n"; 6847 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6848 << FTI.ArgInfo[i].Ident 6849 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6850 6851 // Implicitly declare the argument as type 'int' for lack of a better 6852 // type. 6853 AttributeFactory attrs; 6854 DeclSpec DS(attrs); 6855 const char* PrevSpec; // unused 6856 unsigned DiagID; // unused 6857 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6858 PrevSpec, DiagID); 6859 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6860 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6861 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6862 } 6863 } 6864 } 6865} 6866 6867Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6868 Declarator &D) { 6869 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6870 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6871 Scope *ParentScope = FnBodyScope->getParent(); 6872 6873 D.setFunctionDefinition(true); 6874 Decl *DP = HandleDeclarator(ParentScope, D, 6875 MultiTemplateParamsArg(*this)); 6876 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6877} 6878 6879static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6880 // Don't warn about invalid declarations. 6881 if (FD->isInvalidDecl()) 6882 return false; 6883 6884 // Or declarations that aren't global. 6885 if (!FD->isGlobal()) 6886 return false; 6887 6888 // Don't warn about C++ member functions. 6889 if (isa<CXXMethodDecl>(FD)) 6890 return false; 6891 6892 // Don't warn about 'main'. 6893 if (FD->isMain()) 6894 return false; 6895 6896 // Don't warn about inline functions. 6897 if (FD->isInlined()) 6898 return false; 6899 6900 // Don't warn about function templates. 6901 if (FD->getDescribedFunctionTemplate()) 6902 return false; 6903 6904 // Don't warn about function template specializations. 6905 if (FD->isFunctionTemplateSpecialization()) 6906 return false; 6907 6908 bool MissingPrototype = true; 6909 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6910 Prev; Prev = Prev->getPreviousDeclaration()) { 6911 // Ignore any declarations that occur in function or method 6912 // scope, because they aren't visible from the header. 6913 if (Prev->getDeclContext()->isFunctionOrMethod()) 6914 continue; 6915 6916 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6917 break; 6918 } 6919 6920 return MissingPrototype; 6921} 6922 6923void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6924 // Don't complain if we're in GNU89 mode and the previous definition 6925 // was an extern inline function. 6926 const FunctionDecl *Definition; 6927 if (FD->isDefined(Definition) && 6928 !canRedefineFunction(Definition, getLangOptions())) { 6929 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6930 Definition->getStorageClass() == SC_Extern) 6931 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6932 << FD->getDeclName() << getLangOptions().CPlusPlus; 6933 else 6934 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6935 Diag(Definition->getLocation(), diag::note_previous_definition); 6936 } 6937} 6938 6939Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6940 // Clear the last template instantiation error context. 6941 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6942 6943 if (!D) 6944 return D; 6945 FunctionDecl *FD = 0; 6946 6947 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6948 FD = FunTmpl->getTemplatedDecl(); 6949 else 6950 FD = cast<FunctionDecl>(D); 6951 6952 // Enter a new function scope 6953 PushFunctionScope(); 6954 6955 // See if this is a redefinition. 6956 if (!FD->isLateTemplateParsed()) 6957 CheckForFunctionRedefinition(FD); 6958 6959 // Builtin functions cannot be defined. 6960 if (unsigned BuiltinID = FD->getBuiltinID()) { 6961 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6962 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6963 FD->setInvalidDecl(); 6964 } 6965 } 6966 6967 // The return type of a function definition must be complete 6968 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6969 QualType ResultType = FD->getResultType(); 6970 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6971 !FD->isInvalidDecl() && 6972 RequireCompleteType(FD->getLocation(), ResultType, 6973 diag::err_func_def_incomplete_result)) 6974 FD->setInvalidDecl(); 6975 6976 // GNU warning -Wmissing-prototypes: 6977 // Warn if a global function is defined without a previous 6978 // prototype declaration. This warning is issued even if the 6979 // definition itself provides a prototype. The aim is to detect 6980 // global functions that fail to be declared in header files. 6981 if (ShouldWarnAboutMissingPrototype(FD)) 6982 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6983 6984 if (FnBodyScope) 6985 PushDeclContext(FnBodyScope, FD); 6986 6987 // Check the validity of our function parameters 6988 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6989 /*CheckParameterNames=*/true); 6990 6991 // Introduce our parameters into the function scope 6992 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6993 ParmVarDecl *Param = FD->getParamDecl(p); 6994 Param->setOwningFunction(FD); 6995 6996 // If this has an identifier, add it to the scope stack. 6997 if (Param->getIdentifier() && FnBodyScope) { 6998 CheckShadow(FnBodyScope, Param); 6999 7000 PushOnScopeChains(Param, FnBodyScope); 7001 } 7002 } 7003 7004 // Checking attributes of current function definition 7005 // dllimport attribute. 7006 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7007 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7008 // dllimport attribute cannot be directly applied to definition. 7009 // Microsoft accepts dllimport for functions defined within class scope. 7010 if (!DA->isInherited() && 7011 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7012 Diag(FD->getLocation(), 7013 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7014 << "dllimport"; 7015 FD->setInvalidDecl(); 7016 return FD; 7017 } 7018 7019 // Visual C++ appears to not think this is an issue, so only issue 7020 // a warning when Microsoft extensions are disabled. 7021 if (!LangOpts.MicrosoftExt) { 7022 // If a symbol previously declared dllimport is later defined, the 7023 // attribute is ignored in subsequent references, and a warning is 7024 // emitted. 7025 Diag(FD->getLocation(), 7026 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7027 << FD->getName() << "dllimport"; 7028 } 7029 } 7030 return FD; 7031} 7032 7033/// \brief Given the set of return statements within a function body, 7034/// compute the variables that are subject to the named return value 7035/// optimization. 7036/// 7037/// Each of the variables that is subject to the named return value 7038/// optimization will be marked as NRVO variables in the AST, and any 7039/// return statement that has a marked NRVO variable as its NRVO candidate can 7040/// use the named return value optimization. 7041/// 7042/// This function applies a very simplistic algorithm for NRVO: if every return 7043/// statement in the function has the same NRVO candidate, that candidate is 7044/// the NRVO variable. 7045/// 7046/// FIXME: Employ a smarter algorithm that accounts for multiple return 7047/// statements and the lifetimes of the NRVO candidates. We should be able to 7048/// find a maximal set of NRVO variables. 7049void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7050 ReturnStmt **Returns = Scope->Returns.data(); 7051 7052 const VarDecl *NRVOCandidate = 0; 7053 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7054 if (!Returns[I]->getNRVOCandidate()) 7055 return; 7056 7057 if (!NRVOCandidate) 7058 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7059 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7060 return; 7061 } 7062 7063 if (NRVOCandidate) 7064 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7065} 7066 7067Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7068 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7069} 7070 7071Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7072 bool IsInstantiation) { 7073 FunctionDecl *FD = 0; 7074 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7075 if (FunTmpl) 7076 FD = FunTmpl->getTemplatedDecl(); 7077 else 7078 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7079 7080 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7081 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7082 7083 if (FD) { 7084 FD->setBody(Body); 7085 if (FD->isMain()) { 7086 // C and C++ allow for main to automagically return 0. 7087 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7088 FD->setHasImplicitReturnZero(true); 7089 WP.disableCheckFallThrough(); 7090 } else if (FD->hasAttr<NakedAttr>()) { 7091 // If the function is marked 'naked', don't complain about missing return 7092 // statements. 7093 WP.disableCheckFallThrough(); 7094 } 7095 7096 // MSVC permits the use of pure specifier (=0) on function definition, 7097 // defined at class scope, warn about this non standard construct. 7098 if (getLangOptions().MicrosoftExt && FD->isPure()) 7099 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7100 7101 if (!FD->isInvalidDecl()) { 7102 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7103 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7104 FD->getResultType(), FD); 7105 7106 // If this is a constructor, we need a vtable. 7107 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7108 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7109 7110 computeNRVO(Body, getCurFunction()); 7111 } 7112 7113 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7114 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7115 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7116 MD->setBody(Body); 7117 if (Body) 7118 MD->setEndLoc(Body->getLocEnd()); 7119 if (!MD->isInvalidDecl()) { 7120 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7121 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7122 MD->getResultType(), MD); 7123 7124 if (Body) 7125 computeNRVO(Body, getCurFunction()); 7126 } 7127 if (ObjCShouldCallSuperDealloc) { 7128 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7129 ObjCShouldCallSuperDealloc = false; 7130 } 7131 if (ObjCShouldCallSuperFinalize) { 7132 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7133 ObjCShouldCallSuperFinalize = false; 7134 } 7135 } else { 7136 return 0; 7137 } 7138 7139 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7140 "ObjC methods, which should have been handled in the block above."); 7141 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7142 "ObjC methods, which should have been handled in the block above."); 7143 7144 // Verify and clean out per-function state. 7145 if (Body) { 7146 // C++ constructors that have function-try-blocks can't have return 7147 // statements in the handlers of that block. (C++ [except.handle]p14) 7148 // Verify this. 7149 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7150 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7151 7152 // Verify that gotos and switch cases don't jump into scopes illegally. 7153 if (getCurFunction()->NeedsScopeChecking() && 7154 !dcl->isInvalidDecl() && 7155 !hasAnyUnrecoverableErrorsInThisFunction()) 7156 DiagnoseInvalidJumps(Body); 7157 7158 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7159 if (!Destructor->getParent()->isDependentType()) 7160 CheckDestructor(Destructor); 7161 7162 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7163 Destructor->getParent()); 7164 } 7165 7166 // If any errors have occurred, clear out any temporaries that may have 7167 // been leftover. This ensures that these temporaries won't be picked up for 7168 // deletion in some later function. 7169 if (PP.getDiagnostics().hasErrorOccurred() || 7170 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7171 ExprTemporaries.clear(); 7172 ExprNeedsCleanups = false; 7173 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7174 // Since the body is valid, issue any analysis-based warnings that are 7175 // enabled. 7176 ActivePolicy = &WP; 7177 } 7178 7179 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7180 !CheckConstexprFunctionBody(FD, Body)) 7181 FD->setInvalidDecl(); 7182 7183 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7184 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7185 } 7186 7187 if (!IsInstantiation) 7188 PopDeclContext(); 7189 7190 PopFunctionOrBlockScope(ActivePolicy, dcl); 7191 7192 // If any errors have occurred, clear out any temporaries that may have 7193 // been leftover. This ensures that these temporaries won't be picked up for 7194 // deletion in some later function. 7195 if (getDiagnostics().hasErrorOccurred()) { 7196 ExprTemporaries.clear(); 7197 ExprNeedsCleanups = false; 7198 } 7199 7200 return dcl; 7201} 7202 7203 7204/// When we finish delayed parsing of an attribute, we must attach it to the 7205/// relevant Decl. 7206void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7207 ParsedAttributes &Attrs) { 7208 ProcessDeclAttributeList(S, D, Attrs.getList()); 7209} 7210 7211 7212/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7213/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7214NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7215 IdentifierInfo &II, Scope *S) { 7216 // Before we produce a declaration for an implicitly defined 7217 // function, see whether there was a locally-scoped declaration of 7218 // this name as a function or variable. If so, use that 7219 // (non-visible) declaration, and complain about it. 7220 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7221 = findLocallyScopedExternalDecl(&II); 7222 if (Pos != LocallyScopedExternalDecls.end()) { 7223 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7224 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7225 return Pos->second; 7226 } 7227 7228 // Extension in C99. Legal in C90, but warn about it. 7229 if (II.getName().startswith("__builtin_")) 7230 Diag(Loc, diag::warn_builtin_unknown) << &II; 7231 else if (getLangOptions().C99) 7232 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7233 else 7234 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7235 7236 // Set a Declarator for the implicit definition: int foo(); 7237 const char *Dummy; 7238 AttributeFactory attrFactory; 7239 DeclSpec DS(attrFactory); 7240 unsigned DiagID; 7241 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7242 (void)Error; // Silence warning. 7243 assert(!Error && "Error setting up implicit decl!"); 7244 Declarator D(DS, Declarator::BlockContext); 7245 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7246 0, 0, true, SourceLocation(), 7247 SourceLocation(), SourceLocation(), 7248 SourceLocation(), 7249 EST_None, SourceLocation(), 7250 0, 0, 0, 0, Loc, Loc, D), 7251 DS.getAttributes(), 7252 SourceLocation()); 7253 D.SetIdentifier(&II, Loc); 7254 7255 // Insert this function into translation-unit scope. 7256 7257 DeclContext *PrevDC = CurContext; 7258 CurContext = Context.getTranslationUnitDecl(); 7259 7260 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7261 FD->setImplicit(); 7262 7263 CurContext = PrevDC; 7264 7265 AddKnownFunctionAttributes(FD); 7266 7267 return FD; 7268} 7269 7270/// \brief Adds any function attributes that we know a priori based on 7271/// the declaration of this function. 7272/// 7273/// These attributes can apply both to implicitly-declared builtins 7274/// (like __builtin___printf_chk) or to library-declared functions 7275/// like NSLog or printf. 7276/// 7277/// We need to check for duplicate attributes both here and where user-written 7278/// attributes are applied to declarations. 7279void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7280 if (FD->isInvalidDecl()) 7281 return; 7282 7283 // If this is a built-in function, map its builtin attributes to 7284 // actual attributes. 7285 if (unsigned BuiltinID = FD->getBuiltinID()) { 7286 // Handle printf-formatting attributes. 7287 unsigned FormatIdx; 7288 bool HasVAListArg; 7289 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7290 if (!FD->getAttr<FormatAttr>()) 7291 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7292 "printf", FormatIdx+1, 7293 HasVAListArg ? 0 : FormatIdx+2)); 7294 } 7295 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7296 HasVAListArg)) { 7297 if (!FD->getAttr<FormatAttr>()) 7298 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7299 "scanf", FormatIdx+1, 7300 HasVAListArg ? 0 : FormatIdx+2)); 7301 } 7302 7303 // Mark const if we don't care about errno and that is the only 7304 // thing preventing the function from being const. This allows 7305 // IRgen to use LLVM intrinsics for such functions. 7306 if (!getLangOptions().MathErrno && 7307 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7308 if (!FD->getAttr<ConstAttr>()) 7309 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7310 } 7311 7312 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7313 !FD->getAttr<ReturnsTwiceAttr>()) 7314 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7315 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7316 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7317 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7318 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7319 } 7320 7321 IdentifierInfo *Name = FD->getIdentifier(); 7322 if (!Name) 7323 return; 7324 if ((!getLangOptions().CPlusPlus && 7325 FD->getDeclContext()->isTranslationUnit()) || 7326 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7327 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7328 LinkageSpecDecl::lang_c)) { 7329 // Okay: this could be a libc/libm/Objective-C function we know 7330 // about. 7331 } else 7332 return; 7333 7334 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7335 // FIXME: NSLog and NSLogv should be target specific 7336 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7337 // FIXME: We known better than our headers. 7338 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7339 } else 7340 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7341 "printf", 1, 7342 Name->isStr("NSLogv") ? 0 : 2)); 7343 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7344 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7345 // target-specific builtins, perhaps? 7346 if (!FD->getAttr<FormatAttr>()) 7347 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7348 "printf", 2, 7349 Name->isStr("vasprintf") ? 0 : 3)); 7350 } 7351} 7352 7353TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7354 TypeSourceInfo *TInfo) { 7355 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7356 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7357 7358 if (!TInfo) { 7359 assert(D.isInvalidType() && "no declarator info for valid type"); 7360 TInfo = Context.getTrivialTypeSourceInfo(T); 7361 } 7362 7363 // Scope manipulation handled by caller. 7364 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7365 D.getSourceRange().getBegin(), 7366 D.getIdentifierLoc(), 7367 D.getIdentifier(), 7368 TInfo); 7369 7370 // Bail out immediately if we have an invalid declaration. 7371 if (D.isInvalidType()) { 7372 NewTD->setInvalidDecl(); 7373 return NewTD; 7374 } 7375 7376 if (D.getDeclSpec().isModulePrivateSpecified()) { 7377 if (CurContext->isFunctionOrMethod()) 7378 Diag(NewTD->getLocation(), diag::err_module_private_local) 7379 << 2 << NewTD->getDeclName() 7380 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7381 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7382 else 7383 NewTD->setModulePrivate(); 7384 } 7385 7386 // C++ [dcl.typedef]p8: 7387 // If the typedef declaration defines an unnamed class (or 7388 // enum), the first typedef-name declared by the declaration 7389 // to be that class type (or enum type) is used to denote the 7390 // class type (or enum type) for linkage purposes only. 7391 // We need to check whether the type was declared in the declaration. 7392 switch (D.getDeclSpec().getTypeSpecType()) { 7393 case TST_enum: 7394 case TST_struct: 7395 case TST_union: 7396 case TST_class: { 7397 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7398 7399 // Do nothing if the tag is not anonymous or already has an 7400 // associated typedef (from an earlier typedef in this decl group). 7401 if (tagFromDeclSpec->getIdentifier()) break; 7402 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7403 7404 // A well-formed anonymous tag must always be a TUK_Definition. 7405 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7406 7407 // The type must match the tag exactly; no qualifiers allowed. 7408 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7409 break; 7410 7411 // Otherwise, set this is the anon-decl typedef for the tag. 7412 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7413 break; 7414 } 7415 7416 default: 7417 break; 7418 } 7419 7420 return NewTD; 7421} 7422 7423 7424/// \brief Determine whether a tag with a given kind is acceptable 7425/// as a redeclaration of the given tag declaration. 7426/// 7427/// \returns true if the new tag kind is acceptable, false otherwise. 7428bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7429 TagTypeKind NewTag, bool isDefinition, 7430 SourceLocation NewTagLoc, 7431 const IdentifierInfo &Name) { 7432 // C++ [dcl.type.elab]p3: 7433 // The class-key or enum keyword present in the 7434 // elaborated-type-specifier shall agree in kind with the 7435 // declaration to which the name in the elaborated-type-specifier 7436 // refers. This rule also applies to the form of 7437 // elaborated-type-specifier that declares a class-name or 7438 // friend class since it can be construed as referring to the 7439 // definition of the class. Thus, in any 7440 // elaborated-type-specifier, the enum keyword shall be used to 7441 // refer to an enumeration (7.2), the union class-key shall be 7442 // used to refer to a union (clause 9), and either the class or 7443 // struct class-key shall be used to refer to a class (clause 9) 7444 // declared using the class or struct class-key. 7445 TagTypeKind OldTag = Previous->getTagKind(); 7446 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7447 if (OldTag == NewTag) 7448 return true; 7449 7450 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7451 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7452 // Warn about the struct/class tag mismatch. 7453 bool isTemplate = false; 7454 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7455 isTemplate = Record->getDescribedClassTemplate(); 7456 7457 if (!ActiveTemplateInstantiations.empty()) { 7458 // In a template instantiation, do not offer fix-its for tag mismatches 7459 // since they usually mess up the template instead of fixing the problem. 7460 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7461 << (NewTag == TTK_Class) << isTemplate << &Name; 7462 return true; 7463 } 7464 7465 if (isDefinition) { 7466 // On definitions, check previous tags and issue a fix-it for each 7467 // one that doesn't match the current tag. 7468 if (Previous->getDefinition()) { 7469 // Don't suggest fix-its for redefinitions. 7470 return true; 7471 } 7472 7473 bool previousMismatch = false; 7474 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7475 E(Previous->redecls_end()); I != E; ++I) { 7476 if (I->getTagKind() != NewTag) { 7477 if (!previousMismatch) { 7478 previousMismatch = true; 7479 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7480 << (NewTag == TTK_Class) << isTemplate << &Name; 7481 } 7482 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7483 << (NewTag == TTK_Class) 7484 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7485 NewTag == TTK_Class? 7486 "class" : "struct"); 7487 } 7488 } 7489 return true; 7490 } 7491 7492 // Check for a previous definition. If current tag and definition 7493 // are same type, do nothing. If no definition, but disagree with 7494 // with previous tag type, give a warning, but no fix-it. 7495 const TagDecl *Redecl = Previous->getDefinition() ? 7496 Previous->getDefinition() : Previous; 7497 if (Redecl->getTagKind() == NewTag) { 7498 return true; 7499 } 7500 7501 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7502 << (NewTag == TTK_Class) 7503 << isTemplate << &Name; 7504 Diag(Redecl->getLocation(), diag::note_previous_use); 7505 7506 // If there is a previous defintion, suggest a fix-it. 7507 if (Previous->getDefinition()) { 7508 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7509 << (Redecl->getTagKind() == TTK_Class) 7510 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7511 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7512 } 7513 7514 return true; 7515 } 7516 return false; 7517} 7518 7519/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7520/// former case, Name will be non-null. In the later case, Name will be null. 7521/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7522/// reference/declaration/definition of a tag. 7523Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7524 SourceLocation KWLoc, CXXScopeSpec &SS, 7525 IdentifierInfo *Name, SourceLocation NameLoc, 7526 AttributeList *Attr, AccessSpecifier AS, 7527 SourceLocation ModulePrivateLoc, 7528 MultiTemplateParamsArg TemplateParameterLists, 7529 bool &OwnedDecl, bool &IsDependent, 7530 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7531 TypeResult UnderlyingType) { 7532 // If this is not a definition, it must have a name. 7533 assert((Name != 0 || TUK == TUK_Definition) && 7534 "Nameless record must be a definition!"); 7535 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7536 7537 OwnedDecl = false; 7538 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7539 7540 // FIXME: Check explicit specializations more carefully. 7541 bool isExplicitSpecialization = false; 7542 bool Invalid = false; 7543 7544 // We only need to do this matching if we have template parameters 7545 // or a scope specifier, which also conveniently avoids this work 7546 // for non-C++ cases. 7547 if (TemplateParameterLists.size() > 0 || 7548 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7549 if (TemplateParameterList *TemplateParams 7550 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7551 TemplateParameterLists.get(), 7552 TemplateParameterLists.size(), 7553 TUK == TUK_Friend, 7554 isExplicitSpecialization, 7555 Invalid)) { 7556 if (TemplateParams->size() > 0) { 7557 // This is a declaration or definition of a class template (which may 7558 // be a member of another template). 7559 7560 if (Invalid) 7561 return 0; 7562 7563 OwnedDecl = false; 7564 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7565 SS, Name, NameLoc, Attr, 7566 TemplateParams, AS, 7567 ModulePrivateLoc, 7568 TemplateParameterLists.size() - 1, 7569 (TemplateParameterList**) TemplateParameterLists.release()); 7570 return Result.get(); 7571 } else { 7572 // The "template<>" header is extraneous. 7573 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7574 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7575 isExplicitSpecialization = true; 7576 } 7577 } 7578 } 7579 7580 // Figure out the underlying type if this a enum declaration. We need to do 7581 // this early, because it's needed to detect if this is an incompatible 7582 // redeclaration. 7583 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7584 7585 if (Kind == TTK_Enum) { 7586 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7587 // No underlying type explicitly specified, or we failed to parse the 7588 // type, default to int. 7589 EnumUnderlying = Context.IntTy.getTypePtr(); 7590 else if (UnderlyingType.get()) { 7591 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7592 // integral type; any cv-qualification is ignored. 7593 TypeSourceInfo *TI = 0; 7594 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7595 EnumUnderlying = TI; 7596 7597 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7598 7599 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7600 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7601 << T; 7602 // Recover by falling back to int. 7603 EnumUnderlying = Context.IntTy.getTypePtr(); 7604 } 7605 7606 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7607 UPPC_FixedUnderlyingType)) 7608 EnumUnderlying = Context.IntTy.getTypePtr(); 7609 7610 } else if (getLangOptions().MicrosoftExt) 7611 // Microsoft enums are always of int type. 7612 EnumUnderlying = Context.IntTy.getTypePtr(); 7613 } 7614 7615 DeclContext *SearchDC = CurContext; 7616 DeclContext *DC = CurContext; 7617 bool isStdBadAlloc = false; 7618 7619 RedeclarationKind Redecl = ForRedeclaration; 7620 if (TUK == TUK_Friend || TUK == TUK_Reference) 7621 Redecl = NotForRedeclaration; 7622 7623 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7624 7625 if (Name && SS.isNotEmpty()) { 7626 // We have a nested-name tag ('struct foo::bar'). 7627 7628 // Check for invalid 'foo::'. 7629 if (SS.isInvalid()) { 7630 Name = 0; 7631 goto CreateNewDecl; 7632 } 7633 7634 // If this is a friend or a reference to a class in a dependent 7635 // context, don't try to make a decl for it. 7636 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7637 DC = computeDeclContext(SS, false); 7638 if (!DC) { 7639 IsDependent = true; 7640 return 0; 7641 } 7642 } else { 7643 DC = computeDeclContext(SS, true); 7644 if (!DC) { 7645 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7646 << SS.getRange(); 7647 return 0; 7648 } 7649 } 7650 7651 if (RequireCompleteDeclContext(SS, DC)) 7652 return 0; 7653 7654 SearchDC = DC; 7655 // Look-up name inside 'foo::'. 7656 LookupQualifiedName(Previous, DC); 7657 7658 if (Previous.isAmbiguous()) 7659 return 0; 7660 7661 if (Previous.empty()) { 7662 // Name lookup did not find anything. However, if the 7663 // nested-name-specifier refers to the current instantiation, 7664 // and that current instantiation has any dependent base 7665 // classes, we might find something at instantiation time: treat 7666 // this as a dependent elaborated-type-specifier. 7667 // But this only makes any sense for reference-like lookups. 7668 if (Previous.wasNotFoundInCurrentInstantiation() && 7669 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7670 IsDependent = true; 7671 return 0; 7672 } 7673 7674 // A tag 'foo::bar' must already exist. 7675 Diag(NameLoc, diag::err_not_tag_in_scope) 7676 << Kind << Name << DC << SS.getRange(); 7677 Name = 0; 7678 Invalid = true; 7679 goto CreateNewDecl; 7680 } 7681 } else if (Name) { 7682 // If this is a named struct, check to see if there was a previous forward 7683 // declaration or definition. 7684 // FIXME: We're looking into outer scopes here, even when we 7685 // shouldn't be. Doing so can result in ambiguities that we 7686 // shouldn't be diagnosing. 7687 LookupName(Previous, S); 7688 7689 if (Previous.isAmbiguous() && 7690 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7691 LookupResult::Filter F = Previous.makeFilter(); 7692 while (F.hasNext()) { 7693 NamedDecl *ND = F.next(); 7694 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7695 F.erase(); 7696 } 7697 F.done(); 7698 } 7699 7700 // Note: there used to be some attempt at recovery here. 7701 if (Previous.isAmbiguous()) 7702 return 0; 7703 7704 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7705 // FIXME: This makes sure that we ignore the contexts associated 7706 // with C structs, unions, and enums when looking for a matching 7707 // tag declaration or definition. See the similar lookup tweak 7708 // in Sema::LookupName; is there a better way to deal with this? 7709 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7710 SearchDC = SearchDC->getParent(); 7711 } 7712 } else if (S->isFunctionPrototypeScope()) { 7713 // If this is an enum declaration in function prototype scope, set its 7714 // initial context to the translation unit. 7715 SearchDC = Context.getTranslationUnitDecl(); 7716 } 7717 7718 if (Previous.isSingleResult() && 7719 Previous.getFoundDecl()->isTemplateParameter()) { 7720 // Maybe we will complain about the shadowed template parameter. 7721 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7722 // Just pretend that we didn't see the previous declaration. 7723 Previous.clear(); 7724 } 7725 7726 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7727 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7728 // This is a declaration of or a reference to "std::bad_alloc". 7729 isStdBadAlloc = true; 7730 7731 if (Previous.empty() && StdBadAlloc) { 7732 // std::bad_alloc has been implicitly declared (but made invisible to 7733 // name lookup). Fill in this implicit declaration as the previous 7734 // declaration, so that the declarations get chained appropriately. 7735 Previous.addDecl(getStdBadAlloc()); 7736 } 7737 } 7738 7739 // If we didn't find a previous declaration, and this is a reference 7740 // (or friend reference), move to the correct scope. In C++, we 7741 // also need to do a redeclaration lookup there, just in case 7742 // there's a shadow friend decl. 7743 if (Name && Previous.empty() && 7744 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7745 if (Invalid) goto CreateNewDecl; 7746 assert(SS.isEmpty()); 7747 7748 if (TUK == TUK_Reference) { 7749 // C++ [basic.scope.pdecl]p5: 7750 // -- for an elaborated-type-specifier of the form 7751 // 7752 // class-key identifier 7753 // 7754 // if the elaborated-type-specifier is used in the 7755 // decl-specifier-seq or parameter-declaration-clause of a 7756 // function defined in namespace scope, the identifier is 7757 // declared as a class-name in the namespace that contains 7758 // the declaration; otherwise, except as a friend 7759 // declaration, the identifier is declared in the smallest 7760 // non-class, non-function-prototype scope that contains the 7761 // declaration. 7762 // 7763 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7764 // C structs and unions. 7765 // 7766 // It is an error in C++ to declare (rather than define) an enum 7767 // type, including via an elaborated type specifier. We'll 7768 // diagnose that later; for now, declare the enum in the same 7769 // scope as we would have picked for any other tag type. 7770 // 7771 // GNU C also supports this behavior as part of its incomplete 7772 // enum types extension, while GNU C++ does not. 7773 // 7774 // Find the context where we'll be declaring the tag. 7775 // FIXME: We would like to maintain the current DeclContext as the 7776 // lexical context, 7777 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7778 SearchDC = SearchDC->getParent(); 7779 7780 // Find the scope where we'll be declaring the tag. 7781 while (S->isClassScope() || 7782 (getLangOptions().CPlusPlus && 7783 S->isFunctionPrototypeScope()) || 7784 ((S->getFlags() & Scope::DeclScope) == 0) || 7785 (S->getEntity() && 7786 ((DeclContext *)S->getEntity())->isTransparentContext())) 7787 S = S->getParent(); 7788 } else { 7789 assert(TUK == TUK_Friend); 7790 // C++ [namespace.memdef]p3: 7791 // If a friend declaration in a non-local class first declares a 7792 // class or function, the friend class or function is a member of 7793 // the innermost enclosing namespace. 7794 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7795 } 7796 7797 // In C++, we need to do a redeclaration lookup to properly 7798 // diagnose some problems. 7799 if (getLangOptions().CPlusPlus) { 7800 Previous.setRedeclarationKind(ForRedeclaration); 7801 LookupQualifiedName(Previous, SearchDC); 7802 } 7803 } 7804 7805 if (!Previous.empty()) { 7806 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7807 7808 // It's okay to have a tag decl in the same scope as a typedef 7809 // which hides a tag decl in the same scope. Finding this 7810 // insanity with a redeclaration lookup can only actually happen 7811 // in C++. 7812 // 7813 // This is also okay for elaborated-type-specifiers, which is 7814 // technically forbidden by the current standard but which is 7815 // okay according to the likely resolution of an open issue; 7816 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7817 if (getLangOptions().CPlusPlus) { 7818 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7819 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7820 TagDecl *Tag = TT->getDecl(); 7821 if (Tag->getDeclName() == Name && 7822 Tag->getDeclContext()->getRedeclContext() 7823 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7824 PrevDecl = Tag; 7825 Previous.clear(); 7826 Previous.addDecl(Tag); 7827 Previous.resolveKind(); 7828 } 7829 } 7830 } 7831 } 7832 7833 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7834 // If this is a use of a previous tag, or if the tag is already declared 7835 // in the same scope (so that the definition/declaration completes or 7836 // rementions the tag), reuse the decl. 7837 if (TUK == TUK_Reference || TUK == TUK_Friend || 7838 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7839 // Make sure that this wasn't declared as an enum and now used as a 7840 // struct or something similar. 7841 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7842 TUK == TUK_Definition, KWLoc, 7843 *Name)) { 7844 bool SafeToContinue 7845 = (PrevTagDecl->getTagKind() != TTK_Enum && 7846 Kind != TTK_Enum); 7847 if (SafeToContinue) 7848 Diag(KWLoc, diag::err_use_with_wrong_tag) 7849 << Name 7850 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7851 PrevTagDecl->getKindName()); 7852 else 7853 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7854 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7855 7856 if (SafeToContinue) 7857 Kind = PrevTagDecl->getTagKind(); 7858 else { 7859 // Recover by making this an anonymous redefinition. 7860 Name = 0; 7861 Previous.clear(); 7862 Invalid = true; 7863 } 7864 } 7865 7866 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7867 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7868 7869 // All conflicts with previous declarations are recovered by 7870 // returning the previous declaration. 7871 if (ScopedEnum != PrevEnum->isScoped()) { 7872 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7873 << PrevEnum->isScoped(); 7874 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7875 return PrevTagDecl; 7876 } 7877 else if (EnumUnderlying && PrevEnum->isFixed()) { 7878 QualType T; 7879 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7880 T = TI->getType(); 7881 else 7882 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7883 7884 if (!Context.hasSameUnqualifiedType(T, 7885 PrevEnum->getIntegerType())) { 7886 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7887 diag::err_enum_redeclare_type_mismatch) 7888 << T 7889 << PrevEnum->getIntegerType(); 7890 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7891 return PrevTagDecl; 7892 } 7893 } 7894 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7895 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7896 << PrevEnum->isFixed(); 7897 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7898 return PrevTagDecl; 7899 } 7900 } 7901 7902 if (!Invalid) { 7903 // If this is a use, just return the declaration we found. 7904 7905 // FIXME: In the future, return a variant or some other clue 7906 // for the consumer of this Decl to know it doesn't own it. 7907 // For our current ASTs this shouldn't be a problem, but will 7908 // need to be changed with DeclGroups. 7909 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7910 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7911 return PrevTagDecl; 7912 7913 // Diagnose attempts to redefine a tag. 7914 if (TUK == TUK_Definition) { 7915 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7916 // If we're defining a specialization and the previous definition 7917 // is from an implicit instantiation, don't emit an error 7918 // here; we'll catch this in the general case below. 7919 if (!isExplicitSpecialization || 7920 !isa<CXXRecordDecl>(Def) || 7921 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7922 == TSK_ExplicitSpecialization) { 7923 Diag(NameLoc, diag::err_redefinition) << Name; 7924 Diag(Def->getLocation(), diag::note_previous_definition); 7925 // If this is a redefinition, recover by making this 7926 // struct be anonymous, which will make any later 7927 // references get the previous definition. 7928 Name = 0; 7929 Previous.clear(); 7930 Invalid = true; 7931 } 7932 } else { 7933 // If the type is currently being defined, complain 7934 // about a nested redefinition. 7935 const TagType *Tag 7936 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7937 if (Tag->isBeingDefined()) { 7938 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7939 Diag(PrevTagDecl->getLocation(), 7940 diag::note_previous_definition); 7941 Name = 0; 7942 Previous.clear(); 7943 Invalid = true; 7944 } 7945 } 7946 7947 // Okay, this is definition of a previously declared or referenced 7948 // tag PrevDecl. We're going to create a new Decl for it. 7949 } 7950 } 7951 // If we get here we have (another) forward declaration or we 7952 // have a definition. Just create a new decl. 7953 7954 } else { 7955 // If we get here, this is a definition of a new tag type in a nested 7956 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7957 // new decl/type. We set PrevDecl to NULL so that the entities 7958 // have distinct types. 7959 Previous.clear(); 7960 } 7961 // If we get here, we're going to create a new Decl. If PrevDecl 7962 // is non-NULL, it's a definition of the tag declared by 7963 // PrevDecl. If it's NULL, we have a new definition. 7964 7965 7966 // Otherwise, PrevDecl is not a tag, but was found with tag 7967 // lookup. This is only actually possible in C++, where a few 7968 // things like templates still live in the tag namespace. 7969 } else { 7970 assert(getLangOptions().CPlusPlus); 7971 7972 // Use a better diagnostic if an elaborated-type-specifier 7973 // found the wrong kind of type on the first 7974 // (non-redeclaration) lookup. 7975 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7976 !Previous.isForRedeclaration()) { 7977 unsigned Kind = 0; 7978 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7979 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7980 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7981 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7982 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7983 Invalid = true; 7984 7985 // Otherwise, only diagnose if the declaration is in scope. 7986 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7987 isExplicitSpecialization)) { 7988 // do nothing 7989 7990 // Diagnose implicit declarations introduced by elaborated types. 7991 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7992 unsigned Kind = 0; 7993 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7994 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7995 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7996 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7997 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7998 Invalid = true; 7999 8000 // Otherwise it's a declaration. Call out a particularly common 8001 // case here. 8002 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8003 unsigned Kind = 0; 8004 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8005 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8006 << Name << Kind << TND->getUnderlyingType(); 8007 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8008 Invalid = true; 8009 8010 // Otherwise, diagnose. 8011 } else { 8012 // The tag name clashes with something else in the target scope, 8013 // issue an error and recover by making this tag be anonymous. 8014 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8015 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8016 Name = 0; 8017 Invalid = true; 8018 } 8019 8020 // The existing declaration isn't relevant to us; we're in a 8021 // new scope, so clear out the previous declaration. 8022 Previous.clear(); 8023 } 8024 } 8025 8026CreateNewDecl: 8027 8028 TagDecl *PrevDecl = 0; 8029 if (Previous.isSingleResult()) 8030 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8031 8032 // If there is an identifier, use the location of the identifier as the 8033 // location of the decl, otherwise use the location of the struct/union 8034 // keyword. 8035 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8036 8037 // Otherwise, create a new declaration. If there is a previous 8038 // declaration of the same entity, the two will be linked via 8039 // PrevDecl. 8040 TagDecl *New; 8041 8042 bool IsForwardReference = false; 8043 if (Kind == TTK_Enum) { 8044 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8045 // enum X { A, B, C } D; D should chain to X. 8046 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8047 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8048 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8049 // If this is an undefined enum, warn. 8050 if (TUK != TUK_Definition && !Invalid) { 8051 TagDecl *Def; 8052 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8053 // C++0x: 7.2p2: opaque-enum-declaration. 8054 // Conflicts are diagnosed above. Do nothing. 8055 } 8056 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8057 Diag(Loc, diag::ext_forward_ref_enum_def) 8058 << New; 8059 Diag(Def->getLocation(), diag::note_previous_definition); 8060 } else { 8061 unsigned DiagID = diag::ext_forward_ref_enum; 8062 if (getLangOptions().MicrosoftExt) 8063 DiagID = diag::ext_ms_forward_ref_enum; 8064 else if (getLangOptions().CPlusPlus) 8065 DiagID = diag::err_forward_ref_enum; 8066 Diag(Loc, DiagID); 8067 8068 // If this is a forward-declared reference to an enumeration, make a 8069 // note of it; we won't actually be introducing the declaration into 8070 // the declaration context. 8071 if (TUK == TUK_Reference) 8072 IsForwardReference = true; 8073 } 8074 } 8075 8076 if (EnumUnderlying) { 8077 EnumDecl *ED = cast<EnumDecl>(New); 8078 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8079 ED->setIntegerTypeSourceInfo(TI); 8080 else 8081 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8082 ED->setPromotionType(ED->getIntegerType()); 8083 } 8084 8085 } else { 8086 // struct/union/class 8087 8088 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8089 // struct X { int A; } D; D should chain to X. 8090 if (getLangOptions().CPlusPlus) { 8091 // FIXME: Look for a way to use RecordDecl for simple structs. 8092 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8093 cast_or_null<CXXRecordDecl>(PrevDecl)); 8094 8095 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8096 StdBadAlloc = cast<CXXRecordDecl>(New); 8097 } else 8098 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8099 cast_or_null<RecordDecl>(PrevDecl)); 8100 } 8101 8102 // Maybe add qualifier info. 8103 if (SS.isNotEmpty()) { 8104 if (SS.isSet()) { 8105 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8106 if (TemplateParameterLists.size() > 0) { 8107 New->setTemplateParameterListsInfo(Context, 8108 TemplateParameterLists.size(), 8109 (TemplateParameterList**) TemplateParameterLists.release()); 8110 } 8111 } 8112 else 8113 Invalid = true; 8114 } 8115 8116 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8117 // Add alignment attributes if necessary; these attributes are checked when 8118 // the ASTContext lays out the structure. 8119 // 8120 // It is important for implementing the correct semantics that this 8121 // happen here (in act on tag decl). The #pragma pack stack is 8122 // maintained as a result of parser callbacks which can occur at 8123 // many points during the parsing of a struct declaration (because 8124 // the #pragma tokens are effectively skipped over during the 8125 // parsing of the struct). 8126 AddAlignmentAttributesForRecord(RD); 8127 8128 AddMsStructLayoutForRecord(RD); 8129 } 8130 8131 if (PrevDecl && PrevDecl->isModulePrivate()) 8132 New->setModulePrivate(); 8133 else if (ModulePrivateLoc.isValid()) { 8134 if (isExplicitSpecialization) 8135 Diag(New->getLocation(), diag::err_module_private_specialization) 8136 << 2 8137 << FixItHint::CreateRemoval(ModulePrivateLoc); 8138 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8139 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8140 // __module_private__ does not apply to local classes. However, we only 8141 // diagnose this as an error when the declaration specifiers are 8142 // freestanding. Here, we just ignore the __module_private__. 8143 // foobar 8144 else if (!SearchDC->isFunctionOrMethod()) 8145 New->setModulePrivate(); 8146 } 8147 8148 // If this is a specialization of a member class (of a class template), 8149 // check the specialization. 8150 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8151 Invalid = true; 8152 8153 if (Invalid) 8154 New->setInvalidDecl(); 8155 8156 if (Attr) 8157 ProcessDeclAttributeList(S, New, Attr); 8158 8159 // If we're declaring or defining a tag in function prototype scope 8160 // in C, note that this type can only be used within the function. 8161 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8162 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8163 8164 // Set the lexical context. If the tag has a C++ scope specifier, the 8165 // lexical context will be different from the semantic context. 8166 New->setLexicalDeclContext(CurContext); 8167 8168 // Mark this as a friend decl if applicable. 8169 // In Microsoft mode, a friend declaration also acts as a forward 8170 // declaration so we always pass true to setObjectOfFriendDecl to make 8171 // the tag name visible. 8172 if (TUK == TUK_Friend) 8173 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8174 getLangOptions().MicrosoftExt); 8175 8176 // Set the access specifier. 8177 if (!Invalid && SearchDC->isRecord()) 8178 SetMemberAccessSpecifier(New, PrevDecl, AS); 8179 8180 if (TUK == TUK_Definition) 8181 New->startDefinition(); 8182 8183 // If this has an identifier, add it to the scope stack. 8184 if (TUK == TUK_Friend) { 8185 // We might be replacing an existing declaration in the lookup tables; 8186 // if so, borrow its access specifier. 8187 if (PrevDecl) 8188 New->setAccess(PrevDecl->getAccess()); 8189 8190 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8191 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8192 if (Name) // can be null along some error paths 8193 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8194 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8195 } else if (Name) { 8196 S = getNonFieldDeclScope(S); 8197 PushOnScopeChains(New, S, !IsForwardReference); 8198 if (IsForwardReference) 8199 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8200 8201 } else { 8202 CurContext->addDecl(New); 8203 } 8204 8205 // If this is the C FILE type, notify the AST context. 8206 if (IdentifierInfo *II = New->getIdentifier()) 8207 if (!New->isInvalidDecl() && 8208 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8209 II->isStr("FILE")) 8210 Context.setFILEDecl(New); 8211 8212 OwnedDecl = true; 8213 return New; 8214} 8215 8216void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8217 AdjustDeclIfTemplate(TagD); 8218 TagDecl *Tag = cast<TagDecl>(TagD); 8219 8220 // Enter the tag context. 8221 PushDeclContext(S, Tag); 8222} 8223 8224Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8225 assert(isa<ObjCContainerDecl>(IDecl) && 8226 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8227 DeclContext *OCD = cast<DeclContext>(IDecl); 8228 assert(getContainingDC(OCD) == CurContext && 8229 "The next DeclContext should be lexically contained in the current one."); 8230 CurContext = OCD; 8231 return IDecl; 8232} 8233 8234void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8235 SourceLocation FinalLoc, 8236 SourceLocation LBraceLoc) { 8237 AdjustDeclIfTemplate(TagD); 8238 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8239 8240 FieldCollector->StartClass(); 8241 8242 if (!Record->getIdentifier()) 8243 return; 8244 8245 if (FinalLoc.isValid()) 8246 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8247 8248 // C++ [class]p2: 8249 // [...] The class-name is also inserted into the scope of the 8250 // class itself; this is known as the injected-class-name. For 8251 // purposes of access checking, the injected-class-name is treated 8252 // as if it were a public member name. 8253 CXXRecordDecl *InjectedClassName 8254 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8255 Record->getLocStart(), Record->getLocation(), 8256 Record->getIdentifier(), 8257 /*PrevDecl=*/0, 8258 /*DelayTypeCreation=*/true); 8259 Context.getTypeDeclType(InjectedClassName, Record); 8260 InjectedClassName->setImplicit(); 8261 InjectedClassName->setAccess(AS_public); 8262 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8263 InjectedClassName->setDescribedClassTemplate(Template); 8264 PushOnScopeChains(InjectedClassName, S); 8265 assert(InjectedClassName->isInjectedClassName() && 8266 "Broken injected-class-name"); 8267} 8268 8269void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8270 SourceLocation RBraceLoc) { 8271 AdjustDeclIfTemplate(TagD); 8272 TagDecl *Tag = cast<TagDecl>(TagD); 8273 Tag->setRBraceLoc(RBraceLoc); 8274 8275 if (isa<CXXRecordDecl>(Tag)) 8276 FieldCollector->FinishClass(); 8277 8278 // Exit this scope of this tag's definition. 8279 PopDeclContext(); 8280 8281 // Notify the consumer that we've defined a tag. 8282 Consumer.HandleTagDeclDefinition(Tag); 8283} 8284 8285void Sema::ActOnObjCContainerFinishDefinition() { 8286 // Exit this scope of this interface definition. 8287 PopDeclContext(); 8288} 8289 8290void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8291 OriginalLexicalContext = CurContext; 8292 ActOnObjCContainerFinishDefinition(); 8293} 8294 8295void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8296 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8297 OriginalLexicalContext = 0; 8298} 8299 8300void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8301 AdjustDeclIfTemplate(TagD); 8302 TagDecl *Tag = cast<TagDecl>(TagD); 8303 Tag->setInvalidDecl(); 8304 8305 // We're undoing ActOnTagStartDefinition here, not 8306 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8307 // the FieldCollector. 8308 8309 PopDeclContext(); 8310} 8311 8312// Note that FieldName may be null for anonymous bitfields. 8313bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8314 QualType FieldTy, const Expr *BitWidth, 8315 bool *ZeroWidth) { 8316 // Default to true; that shouldn't confuse checks for emptiness 8317 if (ZeroWidth) 8318 *ZeroWidth = true; 8319 8320 // C99 6.7.2.1p4 - verify the field type. 8321 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8322 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8323 // Handle incomplete types with specific error. 8324 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8325 return true; 8326 if (FieldName) 8327 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8328 << FieldName << FieldTy << BitWidth->getSourceRange(); 8329 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8330 << FieldTy << BitWidth->getSourceRange(); 8331 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8332 UPPC_BitFieldWidth)) 8333 return true; 8334 8335 // If the bit-width is type- or value-dependent, don't try to check 8336 // it now. 8337 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8338 return false; 8339 8340 llvm::APSInt Value; 8341 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8342 return true; 8343 8344 if (Value != 0 && ZeroWidth) 8345 *ZeroWidth = false; 8346 8347 // Zero-width bitfield is ok for anonymous field. 8348 if (Value == 0 && FieldName) 8349 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8350 8351 if (Value.isSigned() && Value.isNegative()) { 8352 if (FieldName) 8353 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8354 << FieldName << Value.toString(10); 8355 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8356 << Value.toString(10); 8357 } 8358 8359 if (!FieldTy->isDependentType()) { 8360 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8361 if (Value.getZExtValue() > TypeSize) { 8362 if (!getLangOptions().CPlusPlus) { 8363 if (FieldName) 8364 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8365 << FieldName << (unsigned)Value.getZExtValue() 8366 << (unsigned)TypeSize; 8367 8368 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8369 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8370 } 8371 8372 if (FieldName) 8373 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8374 << FieldName << (unsigned)Value.getZExtValue() 8375 << (unsigned)TypeSize; 8376 else 8377 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8378 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8379 } 8380 } 8381 8382 return false; 8383} 8384 8385/// ActOnField - Each field of a C struct/union is passed into this in order 8386/// to create a FieldDecl object for it. 8387Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8388 Declarator &D, Expr *BitfieldWidth) { 8389 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8390 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8391 /*HasInit=*/false, AS_public); 8392 return Res; 8393} 8394 8395/// HandleField - Analyze a field of a C struct or a C++ data member. 8396/// 8397FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8398 SourceLocation DeclStart, 8399 Declarator &D, Expr *BitWidth, bool HasInit, 8400 AccessSpecifier AS) { 8401 IdentifierInfo *II = D.getIdentifier(); 8402 SourceLocation Loc = DeclStart; 8403 if (II) Loc = D.getIdentifierLoc(); 8404 8405 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8406 QualType T = TInfo->getType(); 8407 if (getLangOptions().CPlusPlus) { 8408 CheckExtraCXXDefaultArguments(D); 8409 8410 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8411 UPPC_DataMemberType)) { 8412 D.setInvalidType(); 8413 T = Context.IntTy; 8414 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8415 } 8416 } 8417 8418 DiagnoseFunctionSpecifiers(D); 8419 8420 if (D.getDeclSpec().isThreadSpecified()) 8421 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8422 if (D.getDeclSpec().isConstexprSpecified()) 8423 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8424 << 2; 8425 8426 // Check to see if this name was declared as a member previously 8427 NamedDecl *PrevDecl = 0; 8428 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8429 LookupName(Previous, S); 8430 switch (Previous.getResultKind()) { 8431 case LookupResult::Found: 8432 case LookupResult::FoundUnresolvedValue: 8433 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8434 break; 8435 8436 case LookupResult::FoundOverloaded: 8437 PrevDecl = Previous.getRepresentativeDecl(); 8438 break; 8439 8440 case LookupResult::NotFound: 8441 case LookupResult::NotFoundInCurrentInstantiation: 8442 case LookupResult::Ambiguous: 8443 break; 8444 } 8445 Previous.suppressDiagnostics(); 8446 8447 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8448 // Maybe we will complain about the shadowed template parameter. 8449 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8450 // Just pretend that we didn't see the previous declaration. 8451 PrevDecl = 0; 8452 } 8453 8454 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8455 PrevDecl = 0; 8456 8457 bool Mutable 8458 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8459 SourceLocation TSSL = D.getSourceRange().getBegin(); 8460 FieldDecl *NewFD 8461 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8462 TSSL, AS, PrevDecl, &D); 8463 8464 if (NewFD->isInvalidDecl()) 8465 Record->setInvalidDecl(); 8466 8467 if (D.getDeclSpec().isModulePrivateSpecified()) 8468 NewFD->setModulePrivate(); 8469 8470 if (NewFD->isInvalidDecl() && PrevDecl) { 8471 // Don't introduce NewFD into scope; there's already something 8472 // with the same name in the same scope. 8473 } else if (II) { 8474 PushOnScopeChains(NewFD, S); 8475 } else 8476 Record->addDecl(NewFD); 8477 8478 return NewFD; 8479} 8480 8481/// \brief Build a new FieldDecl and check its well-formedness. 8482/// 8483/// This routine builds a new FieldDecl given the fields name, type, 8484/// record, etc. \p PrevDecl should refer to any previous declaration 8485/// with the same name and in the same scope as the field to be 8486/// created. 8487/// 8488/// \returns a new FieldDecl. 8489/// 8490/// \todo The Declarator argument is a hack. It will be removed once 8491FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8492 TypeSourceInfo *TInfo, 8493 RecordDecl *Record, SourceLocation Loc, 8494 bool Mutable, Expr *BitWidth, bool HasInit, 8495 SourceLocation TSSL, 8496 AccessSpecifier AS, NamedDecl *PrevDecl, 8497 Declarator *D) { 8498 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8499 bool InvalidDecl = false; 8500 if (D) InvalidDecl = D->isInvalidType(); 8501 8502 // If we receive a broken type, recover by assuming 'int' and 8503 // marking this declaration as invalid. 8504 if (T.isNull()) { 8505 InvalidDecl = true; 8506 T = Context.IntTy; 8507 } 8508 8509 QualType EltTy = Context.getBaseElementType(T); 8510 if (!EltTy->isDependentType() && 8511 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8512 // Fields of incomplete type force their record to be invalid. 8513 Record->setInvalidDecl(); 8514 InvalidDecl = true; 8515 } 8516 8517 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8518 // than a variably modified type. 8519 if (!InvalidDecl && T->isVariablyModifiedType()) { 8520 bool SizeIsNegative; 8521 llvm::APSInt Oversized; 8522 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8523 SizeIsNegative, 8524 Oversized); 8525 if (!FixedTy.isNull()) { 8526 Diag(Loc, diag::warn_illegal_constant_array_size); 8527 T = FixedTy; 8528 } else { 8529 if (SizeIsNegative) 8530 Diag(Loc, diag::err_typecheck_negative_array_size); 8531 else if (Oversized.getBoolValue()) 8532 Diag(Loc, diag::err_array_too_large) 8533 << Oversized.toString(10); 8534 else 8535 Diag(Loc, diag::err_typecheck_field_variable_size); 8536 InvalidDecl = true; 8537 } 8538 } 8539 8540 // Fields can not have abstract class types 8541 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8542 diag::err_abstract_type_in_decl, 8543 AbstractFieldType)) 8544 InvalidDecl = true; 8545 8546 bool ZeroWidth = false; 8547 // If this is declared as a bit-field, check the bit-field. 8548 if (!InvalidDecl && BitWidth && 8549 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8550 InvalidDecl = true; 8551 BitWidth = 0; 8552 ZeroWidth = false; 8553 } 8554 8555 // Check that 'mutable' is consistent with the type of the declaration. 8556 if (!InvalidDecl && Mutable) { 8557 unsigned DiagID = 0; 8558 if (T->isReferenceType()) 8559 DiagID = diag::err_mutable_reference; 8560 else if (T.isConstQualified()) 8561 DiagID = diag::err_mutable_const; 8562 8563 if (DiagID) { 8564 SourceLocation ErrLoc = Loc; 8565 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8566 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8567 Diag(ErrLoc, DiagID); 8568 Mutable = false; 8569 InvalidDecl = true; 8570 } 8571 } 8572 8573 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8574 BitWidth, Mutable, HasInit); 8575 if (InvalidDecl) 8576 NewFD->setInvalidDecl(); 8577 8578 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8579 Diag(Loc, diag::err_duplicate_member) << II; 8580 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8581 NewFD->setInvalidDecl(); 8582 } 8583 8584 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8585 if (Record->isUnion()) { 8586 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8587 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8588 if (RDecl->getDefinition()) { 8589 // C++ [class.union]p1: An object of a class with a non-trivial 8590 // constructor, a non-trivial copy constructor, a non-trivial 8591 // destructor, or a non-trivial copy assignment operator 8592 // cannot be a member of a union, nor can an array of such 8593 // objects. 8594 if (CheckNontrivialField(NewFD)) 8595 NewFD->setInvalidDecl(); 8596 } 8597 } 8598 8599 // C++ [class.union]p1: If a union contains a member of reference type, 8600 // the program is ill-formed. 8601 if (EltTy->isReferenceType()) { 8602 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8603 << NewFD->getDeclName() << EltTy; 8604 NewFD->setInvalidDecl(); 8605 } 8606 } 8607 } 8608 8609 // FIXME: We need to pass in the attributes given an AST 8610 // representation, not a parser representation. 8611 if (D) 8612 // FIXME: What to pass instead of TUScope? 8613 ProcessDeclAttributes(TUScope, NewFD, *D); 8614 8615 // In auto-retain/release, infer strong retension for fields of 8616 // retainable type. 8617 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8618 NewFD->setInvalidDecl(); 8619 8620 if (T.isObjCGCWeak()) 8621 Diag(Loc, diag::warn_attribute_weak_on_field); 8622 8623 NewFD->setAccess(AS); 8624 return NewFD; 8625} 8626 8627bool Sema::CheckNontrivialField(FieldDecl *FD) { 8628 assert(FD); 8629 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8630 8631 if (FD->isInvalidDecl()) 8632 return true; 8633 8634 QualType EltTy = Context.getBaseElementType(FD->getType()); 8635 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8636 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8637 if (RDecl->getDefinition()) { 8638 // We check for copy constructors before constructors 8639 // because otherwise we'll never get complaints about 8640 // copy constructors. 8641 8642 CXXSpecialMember member = CXXInvalid; 8643 if (!RDecl->hasTrivialCopyConstructor()) 8644 member = CXXCopyConstructor; 8645 else if (!RDecl->hasTrivialDefaultConstructor()) 8646 member = CXXDefaultConstructor; 8647 else if (!RDecl->hasTrivialCopyAssignment()) 8648 member = CXXCopyAssignment; 8649 else if (!RDecl->hasTrivialDestructor()) 8650 member = CXXDestructor; 8651 8652 if (member != CXXInvalid) { 8653 if (!getLangOptions().CPlusPlus0x && 8654 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8655 // Objective-C++ ARC: it is an error to have a non-trivial field of 8656 // a union. However, system headers in Objective-C programs 8657 // occasionally have Objective-C lifetime objects within unions, 8658 // and rather than cause the program to fail, we make those 8659 // members unavailable. 8660 SourceLocation Loc = FD->getLocation(); 8661 if (getSourceManager().isInSystemHeader(Loc)) { 8662 if (!FD->hasAttr<UnavailableAttr>()) 8663 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8664 "this system field has retaining ownership")); 8665 return false; 8666 } 8667 } 8668 8669 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8670 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8671 diag::err_illegal_union_or_anon_struct_member) 8672 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8673 DiagnoseNontrivial(RT, member); 8674 return !getLangOptions().CPlusPlus0x; 8675 } 8676 } 8677 } 8678 8679 return false; 8680} 8681 8682/// DiagnoseNontrivial - Given that a class has a non-trivial 8683/// special member, figure out why. 8684void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8685 QualType QT(T, 0U); 8686 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8687 8688 // Check whether the member was user-declared. 8689 switch (member) { 8690 case CXXInvalid: 8691 break; 8692 8693 case CXXDefaultConstructor: 8694 if (RD->hasUserDeclaredConstructor()) { 8695 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8696 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8697 const FunctionDecl *body = 0; 8698 ci->hasBody(body); 8699 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8700 SourceLocation CtorLoc = ci->getLocation(); 8701 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8702 return; 8703 } 8704 } 8705 8706 llvm_unreachable("found no user-declared constructors"); 8707 } 8708 break; 8709 8710 case CXXCopyConstructor: 8711 if (RD->hasUserDeclaredCopyConstructor()) { 8712 SourceLocation CtorLoc = 8713 RD->getCopyConstructor(0)->getLocation(); 8714 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8715 return; 8716 } 8717 break; 8718 8719 case CXXMoveConstructor: 8720 if (RD->hasUserDeclaredMoveConstructor()) { 8721 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8722 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8723 return; 8724 } 8725 break; 8726 8727 case CXXCopyAssignment: 8728 if (RD->hasUserDeclaredCopyAssignment()) { 8729 // FIXME: this should use the location of the copy 8730 // assignment, not the type. 8731 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8732 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8733 return; 8734 } 8735 break; 8736 8737 case CXXMoveAssignment: 8738 if (RD->hasUserDeclaredMoveAssignment()) { 8739 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8740 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8741 return; 8742 } 8743 break; 8744 8745 case CXXDestructor: 8746 if (RD->hasUserDeclaredDestructor()) { 8747 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8748 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8749 return; 8750 } 8751 break; 8752 } 8753 8754 typedef CXXRecordDecl::base_class_iterator base_iter; 8755 8756 // Virtual bases and members inhibit trivial copying/construction, 8757 // but not trivial destruction. 8758 if (member != CXXDestructor) { 8759 // Check for virtual bases. vbases includes indirect virtual bases, 8760 // so we just iterate through the direct bases. 8761 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8762 if (bi->isVirtual()) { 8763 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8764 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8765 return; 8766 } 8767 8768 // Check for virtual methods. 8769 typedef CXXRecordDecl::method_iterator meth_iter; 8770 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8771 ++mi) { 8772 if (mi->isVirtual()) { 8773 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8774 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8775 return; 8776 } 8777 } 8778 } 8779 8780 bool (CXXRecordDecl::*hasTrivial)() const; 8781 switch (member) { 8782 case CXXDefaultConstructor: 8783 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8784 case CXXCopyConstructor: 8785 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8786 case CXXCopyAssignment: 8787 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8788 case CXXDestructor: 8789 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8790 default: 8791 llvm_unreachable("unexpected special member"); 8792 } 8793 8794 // Check for nontrivial bases (and recurse). 8795 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8796 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8797 assert(BaseRT && "Don't know how to handle dependent bases"); 8798 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8799 if (!(BaseRecTy->*hasTrivial)()) { 8800 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8801 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8802 DiagnoseNontrivial(BaseRT, member); 8803 return; 8804 } 8805 } 8806 8807 // Check for nontrivial members (and recurse). 8808 typedef RecordDecl::field_iterator field_iter; 8809 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8810 ++fi) { 8811 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8812 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8813 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8814 8815 if (!(EltRD->*hasTrivial)()) { 8816 SourceLocation FLoc = (*fi)->getLocation(); 8817 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8818 DiagnoseNontrivial(EltRT, member); 8819 return; 8820 } 8821 } 8822 8823 if (EltTy->isObjCLifetimeType()) { 8824 switch (EltTy.getObjCLifetime()) { 8825 case Qualifiers::OCL_None: 8826 case Qualifiers::OCL_ExplicitNone: 8827 break; 8828 8829 case Qualifiers::OCL_Autoreleasing: 8830 case Qualifiers::OCL_Weak: 8831 case Qualifiers::OCL_Strong: 8832 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8833 << QT << EltTy.getObjCLifetime(); 8834 return; 8835 } 8836 } 8837 } 8838 8839 llvm_unreachable("found no explanation for non-trivial member"); 8840} 8841 8842/// TranslateIvarVisibility - Translate visibility from a token ID to an 8843/// AST enum value. 8844static ObjCIvarDecl::AccessControl 8845TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8846 switch (ivarVisibility) { 8847 default: llvm_unreachable("Unknown visitibility kind"); 8848 case tok::objc_private: return ObjCIvarDecl::Private; 8849 case tok::objc_public: return ObjCIvarDecl::Public; 8850 case tok::objc_protected: return ObjCIvarDecl::Protected; 8851 case tok::objc_package: return ObjCIvarDecl::Package; 8852 } 8853} 8854 8855/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8856/// in order to create an IvarDecl object for it. 8857Decl *Sema::ActOnIvar(Scope *S, 8858 SourceLocation DeclStart, 8859 Declarator &D, Expr *BitfieldWidth, 8860 tok::ObjCKeywordKind Visibility) { 8861 8862 IdentifierInfo *II = D.getIdentifier(); 8863 Expr *BitWidth = (Expr*)BitfieldWidth; 8864 SourceLocation Loc = DeclStart; 8865 if (II) Loc = D.getIdentifierLoc(); 8866 8867 // FIXME: Unnamed fields can be handled in various different ways, for 8868 // example, unnamed unions inject all members into the struct namespace! 8869 8870 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8871 QualType T = TInfo->getType(); 8872 8873 if (BitWidth) { 8874 // 6.7.2.1p3, 6.7.2.1p4 8875 if (VerifyBitField(Loc, II, T, BitWidth)) { 8876 D.setInvalidType(); 8877 BitWidth = 0; 8878 } 8879 } else { 8880 // Not a bitfield. 8881 8882 // validate II. 8883 8884 } 8885 if (T->isReferenceType()) { 8886 Diag(Loc, diag::err_ivar_reference_type); 8887 D.setInvalidType(); 8888 } 8889 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8890 // than a variably modified type. 8891 else if (T->isVariablyModifiedType()) { 8892 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8893 D.setInvalidType(); 8894 } 8895 8896 // Get the visibility (access control) for this ivar. 8897 ObjCIvarDecl::AccessControl ac = 8898 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8899 : ObjCIvarDecl::None; 8900 // Must set ivar's DeclContext to its enclosing interface. 8901 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8902 ObjCContainerDecl *EnclosingContext; 8903 if (ObjCImplementationDecl *IMPDecl = 8904 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8905 if (!LangOpts.ObjCNonFragileABI2) { 8906 // Case of ivar declared in an implementation. Context is that of its class. 8907 EnclosingContext = IMPDecl->getClassInterface(); 8908 assert(EnclosingContext && "Implementation has no class interface!"); 8909 } 8910 else 8911 EnclosingContext = EnclosingDecl; 8912 } else { 8913 if (ObjCCategoryDecl *CDecl = 8914 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8915 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8916 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8917 return 0; 8918 } 8919 } 8920 EnclosingContext = EnclosingDecl; 8921 } 8922 8923 // Construct the decl. 8924 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8925 DeclStart, Loc, II, T, 8926 TInfo, ac, (Expr *)BitfieldWidth); 8927 8928 if (II) { 8929 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8930 ForRedeclaration); 8931 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8932 && !isa<TagDecl>(PrevDecl)) { 8933 Diag(Loc, diag::err_duplicate_member) << II; 8934 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8935 NewID->setInvalidDecl(); 8936 } 8937 } 8938 8939 // Process attributes attached to the ivar. 8940 ProcessDeclAttributes(S, NewID, D); 8941 8942 if (D.isInvalidType()) 8943 NewID->setInvalidDecl(); 8944 8945 // In ARC, infer 'retaining' for ivars of retainable type. 8946 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8947 NewID->setInvalidDecl(); 8948 8949 if (D.getDeclSpec().isModulePrivateSpecified()) 8950 NewID->setModulePrivate(); 8951 8952 if (II) { 8953 // FIXME: When interfaces are DeclContexts, we'll need to add 8954 // these to the interface. 8955 S->AddDecl(NewID); 8956 IdResolver.AddDecl(NewID); 8957 } 8958 8959 return NewID; 8960} 8961 8962/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8963/// class and class extensions. For every class @interface and class 8964/// extension @interface, if the last ivar is a bitfield of any type, 8965/// then add an implicit `char :0` ivar to the end of that interface. 8966void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8967 SmallVectorImpl<Decl *> &AllIvarDecls) { 8968 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8969 return; 8970 8971 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8972 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8973 8974 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8975 return; 8976 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8977 if (!ID) { 8978 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8979 if (!CD->IsClassExtension()) 8980 return; 8981 } 8982 // No need to add this to end of @implementation. 8983 else 8984 return; 8985 } 8986 // All conditions are met. Add a new bitfield to the tail end of ivars. 8987 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8988 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8989 8990 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8991 DeclLoc, DeclLoc, 0, 8992 Context.CharTy, 8993 Context.getTrivialTypeSourceInfo(Context.CharTy, 8994 DeclLoc), 8995 ObjCIvarDecl::Private, BW, 8996 true); 8997 AllIvarDecls.push_back(Ivar); 8998} 8999 9000void Sema::ActOnFields(Scope* S, 9001 SourceLocation RecLoc, Decl *EnclosingDecl, 9002 llvm::ArrayRef<Decl *> Fields, 9003 SourceLocation LBrac, SourceLocation RBrac, 9004 AttributeList *Attr) { 9005 assert(EnclosingDecl && "missing record or interface decl"); 9006 9007 // If the decl this is being inserted into is invalid, then it may be a 9008 // redeclaration or some other bogus case. Don't try to add fields to it. 9009 if (EnclosingDecl->isInvalidDecl()) 9010 return; 9011 9012 // Verify that all the fields are okay. 9013 unsigned NumNamedMembers = 0; 9014 SmallVector<FieldDecl*, 32> RecFields; 9015 9016 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9017 bool ARCErrReported = false; 9018 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9019 i != end; ++i) { 9020 FieldDecl *FD = cast<FieldDecl>(*i); 9021 9022 // Get the type for the field. 9023 const Type *FDTy = FD->getType().getTypePtr(); 9024 9025 if (!FD->isAnonymousStructOrUnion()) { 9026 // Remember all fields written by the user. 9027 RecFields.push_back(FD); 9028 } 9029 9030 // If the field is already invalid for some reason, don't emit more 9031 // diagnostics about it. 9032 if (FD->isInvalidDecl()) { 9033 EnclosingDecl->setInvalidDecl(); 9034 continue; 9035 } 9036 9037 // C99 6.7.2.1p2: 9038 // A structure or union shall not contain a member with 9039 // incomplete or function type (hence, a structure shall not 9040 // contain an instance of itself, but may contain a pointer to 9041 // an instance of itself), except that the last member of a 9042 // structure with more than one named member may have incomplete 9043 // array type; such a structure (and any union containing, 9044 // possibly recursively, a member that is such a structure) 9045 // shall not be a member of a structure or an element of an 9046 // array. 9047 if (FDTy->isFunctionType()) { 9048 // Field declared as a function. 9049 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9050 << FD->getDeclName(); 9051 FD->setInvalidDecl(); 9052 EnclosingDecl->setInvalidDecl(); 9053 continue; 9054 } else if (FDTy->isIncompleteArrayType() && Record && 9055 ((i + 1 == Fields.end() && !Record->isUnion()) || 9056 ((getLangOptions().MicrosoftExt || 9057 getLangOptions().CPlusPlus) && 9058 (i + 1 == Fields.end() || Record->isUnion())))) { 9059 // Flexible array member. 9060 // Microsoft and g++ is more permissive regarding flexible array. 9061 // It will accept flexible array in union and also 9062 // as the sole element of a struct/class. 9063 if (getLangOptions().MicrosoftExt) { 9064 if (Record->isUnion()) 9065 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9066 << FD->getDeclName(); 9067 else if (Fields.size() == 1) 9068 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9069 << FD->getDeclName() << Record->getTagKind(); 9070 } else if (getLangOptions().CPlusPlus) { 9071 if (Record->isUnion()) 9072 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9073 << FD->getDeclName(); 9074 else if (Fields.size() == 1) 9075 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9076 << FD->getDeclName() << Record->getTagKind(); 9077 } else if (NumNamedMembers < 1) { 9078 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9079 << FD->getDeclName(); 9080 FD->setInvalidDecl(); 9081 EnclosingDecl->setInvalidDecl(); 9082 continue; 9083 } 9084 if (!FD->getType()->isDependentType() && 9085 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9086 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9087 << FD->getDeclName() << FD->getType(); 9088 FD->setInvalidDecl(); 9089 EnclosingDecl->setInvalidDecl(); 9090 continue; 9091 } 9092 // Okay, we have a legal flexible array member at the end of the struct. 9093 if (Record) 9094 Record->setHasFlexibleArrayMember(true); 9095 } else if (!FDTy->isDependentType() && 9096 RequireCompleteType(FD->getLocation(), FD->getType(), 9097 diag::err_field_incomplete)) { 9098 // Incomplete type 9099 FD->setInvalidDecl(); 9100 EnclosingDecl->setInvalidDecl(); 9101 continue; 9102 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9103 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9104 // If this is a member of a union, then entire union becomes "flexible". 9105 if (Record && Record->isUnion()) { 9106 Record->setHasFlexibleArrayMember(true); 9107 } else { 9108 // If this is a struct/class and this is not the last element, reject 9109 // it. Note that GCC supports variable sized arrays in the middle of 9110 // structures. 9111 if (i + 1 != Fields.end()) 9112 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9113 << FD->getDeclName() << FD->getType(); 9114 else { 9115 // We support flexible arrays at the end of structs in 9116 // other structs as an extension. 9117 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9118 << FD->getDeclName(); 9119 if (Record) 9120 Record->setHasFlexibleArrayMember(true); 9121 } 9122 } 9123 } 9124 if (Record && FDTTy->getDecl()->hasObjectMember()) 9125 Record->setHasObjectMember(true); 9126 } else if (FDTy->isObjCObjectType()) { 9127 /// A field cannot be an Objective-c object 9128 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9129 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9130 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9131 FD->setType(T); 9132 } 9133 else if (!getLangOptions().CPlusPlus) { 9134 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9135 // It's an error in ARC if a field has lifetime. 9136 // We don't want to report this in a system header, though, 9137 // so we just make the field unavailable. 9138 // FIXME: that's really not sufficient; we need to make the type 9139 // itself invalid to, say, initialize or copy. 9140 QualType T = FD->getType(); 9141 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9142 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9143 SourceLocation loc = FD->getLocation(); 9144 if (getSourceManager().isInSystemHeader(loc)) { 9145 if (!FD->hasAttr<UnavailableAttr>()) { 9146 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9147 "this system field has retaining ownership")); 9148 } 9149 } else { 9150 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9151 } 9152 ARCErrReported = true; 9153 } 9154 } 9155 else if (getLangOptions().ObjC1 && 9156 getLangOptions().getGC() != LangOptions::NonGC && 9157 Record && !Record->hasObjectMember()) { 9158 if (FD->getType()->isObjCObjectPointerType() || 9159 FD->getType().isObjCGCStrong()) 9160 Record->setHasObjectMember(true); 9161 else if (Context.getAsArrayType(FD->getType())) { 9162 QualType BaseType = Context.getBaseElementType(FD->getType()); 9163 if (BaseType->isRecordType() && 9164 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9165 Record->setHasObjectMember(true); 9166 else if (BaseType->isObjCObjectPointerType() || 9167 BaseType.isObjCGCStrong()) 9168 Record->setHasObjectMember(true); 9169 } 9170 } 9171 } 9172 // Keep track of the number of named members. 9173 if (FD->getIdentifier()) 9174 ++NumNamedMembers; 9175 } 9176 9177 // Okay, we successfully defined 'Record'. 9178 if (Record) { 9179 bool Completed = false; 9180 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9181 if (!CXXRecord->isInvalidDecl()) { 9182 // Set access bits correctly on the directly-declared conversions. 9183 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9184 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9185 I != E; ++I) 9186 Convs->setAccess(I, (*I)->getAccess()); 9187 9188 if (!CXXRecord->isDependentType()) { 9189 // Objective-C Automatic Reference Counting: 9190 // If a class has a non-static data member of Objective-C pointer 9191 // type (or array thereof), it is a non-POD type and its 9192 // default constructor (if any), copy constructor, copy assignment 9193 // operator, and destructor are non-trivial. 9194 // 9195 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9196 // However, here we check whether this particular class is only 9197 // non-POD because of the presence of an Objective-C pointer member. 9198 // If so, objects of this type cannot be shared between code compiled 9199 // with instant objects and code compiled with manual retain/release. 9200 if (getLangOptions().ObjCAutoRefCount && 9201 CXXRecord->hasObjectMember() && 9202 CXXRecord->getLinkage() == ExternalLinkage) { 9203 if (CXXRecord->isPOD()) { 9204 Diag(CXXRecord->getLocation(), 9205 diag::warn_arc_non_pod_class_with_object_member) 9206 << CXXRecord; 9207 } else { 9208 // FIXME: Fix-Its would be nice here, but finding a good location 9209 // for them is going to be tricky. 9210 if (CXXRecord->hasTrivialCopyConstructor()) 9211 Diag(CXXRecord->getLocation(), 9212 diag::warn_arc_trivial_member_function_with_object_member) 9213 << CXXRecord << 0; 9214 if (CXXRecord->hasTrivialCopyAssignment()) 9215 Diag(CXXRecord->getLocation(), 9216 diag::warn_arc_trivial_member_function_with_object_member) 9217 << CXXRecord << 1; 9218 if (CXXRecord->hasTrivialDestructor()) 9219 Diag(CXXRecord->getLocation(), 9220 diag::warn_arc_trivial_member_function_with_object_member) 9221 << CXXRecord << 2; 9222 } 9223 } 9224 9225 // Adjust user-defined destructor exception spec. 9226 if (getLangOptions().CPlusPlus0x && 9227 CXXRecord->hasUserDeclaredDestructor()) 9228 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9229 9230 // Add any implicitly-declared members to this class. 9231 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9232 9233 // If we have virtual base classes, we may end up finding multiple 9234 // final overriders for a given virtual function. Check for this 9235 // problem now. 9236 if (CXXRecord->getNumVBases()) { 9237 CXXFinalOverriderMap FinalOverriders; 9238 CXXRecord->getFinalOverriders(FinalOverriders); 9239 9240 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9241 MEnd = FinalOverriders.end(); 9242 M != MEnd; ++M) { 9243 for (OverridingMethods::iterator SO = M->second.begin(), 9244 SOEnd = M->second.end(); 9245 SO != SOEnd; ++SO) { 9246 assert(SO->second.size() > 0 && 9247 "Virtual function without overridding functions?"); 9248 if (SO->second.size() == 1) 9249 continue; 9250 9251 // C++ [class.virtual]p2: 9252 // In a derived class, if a virtual member function of a base 9253 // class subobject has more than one final overrider the 9254 // program is ill-formed. 9255 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9256 << (NamedDecl *)M->first << Record; 9257 Diag(M->first->getLocation(), 9258 diag::note_overridden_virtual_function); 9259 for (OverridingMethods::overriding_iterator 9260 OM = SO->second.begin(), 9261 OMEnd = SO->second.end(); 9262 OM != OMEnd; ++OM) 9263 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9264 << (NamedDecl *)M->first << OM->Method->getParent(); 9265 9266 Record->setInvalidDecl(); 9267 } 9268 } 9269 CXXRecord->completeDefinition(&FinalOverriders); 9270 Completed = true; 9271 } 9272 } 9273 } 9274 } 9275 9276 if (!Completed) 9277 Record->completeDefinition(); 9278 9279 // Now that the record is complete, do any delayed exception spec checks 9280 // we were missing. 9281 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9282 const CXXDestructorDecl *Dtor = 9283 DelayedDestructorExceptionSpecChecks.back().first; 9284 if (Dtor->getParent() != Record) 9285 break; 9286 9287 assert(!Dtor->getParent()->isDependentType() && 9288 "Should not ever add destructors of templates into the list."); 9289 CheckOverridingFunctionExceptionSpec(Dtor, 9290 DelayedDestructorExceptionSpecChecks.back().second); 9291 DelayedDestructorExceptionSpecChecks.pop_back(); 9292 } 9293 9294 } else { 9295 ObjCIvarDecl **ClsFields = 9296 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9297 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9298 ID->setLocEnd(RBrac); 9299 // Add ivar's to class's DeclContext. 9300 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9301 ClsFields[i]->setLexicalDeclContext(ID); 9302 ID->addDecl(ClsFields[i]); 9303 } 9304 // Must enforce the rule that ivars in the base classes may not be 9305 // duplicates. 9306 if (ID->getSuperClass()) 9307 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9308 } else if (ObjCImplementationDecl *IMPDecl = 9309 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9310 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9311 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9312 // Ivar declared in @implementation never belongs to the implementation. 9313 // Only it is in implementation's lexical context. 9314 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9315 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9316 } else if (ObjCCategoryDecl *CDecl = 9317 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9318 // case of ivars in class extension; all other cases have been 9319 // reported as errors elsewhere. 9320 // FIXME. Class extension does not have a LocEnd field. 9321 // CDecl->setLocEnd(RBrac); 9322 // Add ivar's to class extension's DeclContext. 9323 // Diagnose redeclaration of private ivars. 9324 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9325 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9326 if (IDecl) { 9327 if (const ObjCIvarDecl *ClsIvar = 9328 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9329 Diag(ClsFields[i]->getLocation(), 9330 diag::err_duplicate_ivar_declaration); 9331 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9332 continue; 9333 } 9334 for (const ObjCCategoryDecl *ClsExtDecl = 9335 IDecl->getFirstClassExtension(); 9336 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9337 if (const ObjCIvarDecl *ClsExtIvar = 9338 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9339 Diag(ClsFields[i]->getLocation(), 9340 diag::err_duplicate_ivar_declaration); 9341 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9342 continue; 9343 } 9344 } 9345 } 9346 ClsFields[i]->setLexicalDeclContext(CDecl); 9347 CDecl->addDecl(ClsFields[i]); 9348 } 9349 } 9350 } 9351 9352 if (Attr) 9353 ProcessDeclAttributeList(S, Record, Attr); 9354 9355 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9356 // set the visibility of this record. 9357 if (Record && !Record->getDeclContext()->isRecord()) 9358 AddPushedVisibilityAttribute(Record); 9359} 9360 9361/// \brief Determine whether the given integral value is representable within 9362/// the given type T. 9363static bool isRepresentableIntegerValue(ASTContext &Context, 9364 llvm::APSInt &Value, 9365 QualType T) { 9366 assert(T->isIntegralType(Context) && "Integral type required!"); 9367 unsigned BitWidth = Context.getIntWidth(T); 9368 9369 if (Value.isUnsigned() || Value.isNonNegative()) { 9370 if (T->isSignedIntegerOrEnumerationType()) 9371 --BitWidth; 9372 return Value.getActiveBits() <= BitWidth; 9373 } 9374 return Value.getMinSignedBits() <= BitWidth; 9375} 9376 9377// \brief Given an integral type, return the next larger integral type 9378// (or a NULL type of no such type exists). 9379static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9380 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9381 // enum checking below. 9382 assert(T->isIntegralType(Context) && "Integral type required!"); 9383 const unsigned NumTypes = 4; 9384 QualType SignedIntegralTypes[NumTypes] = { 9385 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9386 }; 9387 QualType UnsignedIntegralTypes[NumTypes] = { 9388 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9389 Context.UnsignedLongLongTy 9390 }; 9391 9392 unsigned BitWidth = Context.getTypeSize(T); 9393 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9394 : UnsignedIntegralTypes; 9395 for (unsigned I = 0; I != NumTypes; ++I) 9396 if (Context.getTypeSize(Types[I]) > BitWidth) 9397 return Types[I]; 9398 9399 return QualType(); 9400} 9401 9402EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9403 EnumConstantDecl *LastEnumConst, 9404 SourceLocation IdLoc, 9405 IdentifierInfo *Id, 9406 Expr *Val) { 9407 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9408 llvm::APSInt EnumVal(IntWidth); 9409 QualType EltTy; 9410 9411 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9412 Val = 0; 9413 9414 if (Val) { 9415 if (Enum->isDependentType() || Val->isTypeDependent()) 9416 EltTy = Context.DependentTy; 9417 else { 9418 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9419 SourceLocation ExpLoc; 9420 if (!Val->isValueDependent() && 9421 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9422 Val = 0; 9423 } else { 9424 if (!getLangOptions().CPlusPlus) { 9425 // C99 6.7.2.2p2: 9426 // The expression that defines the value of an enumeration constant 9427 // shall be an integer constant expression that has a value 9428 // representable as an int. 9429 9430 // Complain if the value is not representable in an int. 9431 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9432 Diag(IdLoc, diag::ext_enum_value_not_int) 9433 << EnumVal.toString(10) << Val->getSourceRange() 9434 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9435 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9436 // Force the type of the expression to 'int'. 9437 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9438 } 9439 } 9440 9441 if (Enum->isFixed()) { 9442 EltTy = Enum->getIntegerType(); 9443 9444 // C++0x [dcl.enum]p5: 9445 // ... if the initializing value of an enumerator cannot be 9446 // represented by the underlying type, the program is ill-formed. 9447 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9448 if (getLangOptions().MicrosoftExt) { 9449 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9450 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9451 } else 9452 Diag(IdLoc, diag::err_enumerator_too_large) 9453 << EltTy; 9454 } else 9455 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9456 } 9457 else { 9458 // C++0x [dcl.enum]p5: 9459 // If the underlying type is not fixed, the type of each enumerator 9460 // is the type of its initializing value: 9461 // - If an initializer is specified for an enumerator, the 9462 // initializing value has the same type as the expression. 9463 EltTy = Val->getType(); 9464 } 9465 } 9466 } 9467 } 9468 9469 if (!Val) { 9470 if (Enum->isDependentType()) 9471 EltTy = Context.DependentTy; 9472 else if (!LastEnumConst) { 9473 // C++0x [dcl.enum]p5: 9474 // If the underlying type is not fixed, the type of each enumerator 9475 // is the type of its initializing value: 9476 // - If no initializer is specified for the first enumerator, the 9477 // initializing value has an unspecified integral type. 9478 // 9479 // GCC uses 'int' for its unspecified integral type, as does 9480 // C99 6.7.2.2p3. 9481 if (Enum->isFixed()) { 9482 EltTy = Enum->getIntegerType(); 9483 } 9484 else { 9485 EltTy = Context.IntTy; 9486 } 9487 } else { 9488 // Assign the last value + 1. 9489 EnumVal = LastEnumConst->getInitVal(); 9490 ++EnumVal; 9491 EltTy = LastEnumConst->getType(); 9492 9493 // Check for overflow on increment. 9494 if (EnumVal < LastEnumConst->getInitVal()) { 9495 // C++0x [dcl.enum]p5: 9496 // If the underlying type is not fixed, the type of each enumerator 9497 // is the type of its initializing value: 9498 // 9499 // - Otherwise the type of the initializing value is the same as 9500 // the type of the initializing value of the preceding enumerator 9501 // unless the incremented value is not representable in that type, 9502 // in which case the type is an unspecified integral type 9503 // sufficient to contain the incremented value. If no such type 9504 // exists, the program is ill-formed. 9505 QualType T = getNextLargerIntegralType(Context, EltTy); 9506 if (T.isNull() || Enum->isFixed()) { 9507 // There is no integral type larger enough to represent this 9508 // value. Complain, then allow the value to wrap around. 9509 EnumVal = LastEnumConst->getInitVal(); 9510 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9511 ++EnumVal; 9512 if (Enum->isFixed()) 9513 // When the underlying type is fixed, this is ill-formed. 9514 Diag(IdLoc, diag::err_enumerator_wrapped) 9515 << EnumVal.toString(10) 9516 << EltTy; 9517 else 9518 Diag(IdLoc, diag::warn_enumerator_too_large) 9519 << EnumVal.toString(10); 9520 } else { 9521 EltTy = T; 9522 } 9523 9524 // Retrieve the last enumerator's value, extent that type to the 9525 // type that is supposed to be large enough to represent the incremented 9526 // value, then increment. 9527 EnumVal = LastEnumConst->getInitVal(); 9528 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9529 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9530 ++EnumVal; 9531 9532 // If we're not in C++, diagnose the overflow of enumerator values, 9533 // which in C99 means that the enumerator value is not representable in 9534 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9535 // permits enumerator values that are representable in some larger 9536 // integral type. 9537 if (!getLangOptions().CPlusPlus && !T.isNull()) 9538 Diag(IdLoc, diag::warn_enum_value_overflow); 9539 } else if (!getLangOptions().CPlusPlus && 9540 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9541 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9542 Diag(IdLoc, diag::ext_enum_value_not_int) 9543 << EnumVal.toString(10) << 1; 9544 } 9545 } 9546 } 9547 9548 if (!EltTy->isDependentType()) { 9549 // Make the enumerator value match the signedness and size of the 9550 // enumerator's type. 9551 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9552 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9553 } 9554 9555 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9556 Val, EnumVal); 9557} 9558 9559 9560Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9561 SourceLocation IdLoc, IdentifierInfo *Id, 9562 AttributeList *Attr, 9563 SourceLocation EqualLoc, Expr *val) { 9564 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9565 EnumConstantDecl *LastEnumConst = 9566 cast_or_null<EnumConstantDecl>(lastEnumConst); 9567 Expr *Val = static_cast<Expr*>(val); 9568 9569 // The scope passed in may not be a decl scope. Zip up the scope tree until 9570 // we find one that is. 9571 S = getNonFieldDeclScope(S); 9572 9573 // Verify that there isn't already something declared with this name in this 9574 // scope. 9575 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9576 ForRedeclaration); 9577 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9578 // Maybe we will complain about the shadowed template parameter. 9579 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9580 // Just pretend that we didn't see the previous declaration. 9581 PrevDecl = 0; 9582 } 9583 9584 if (PrevDecl) { 9585 // When in C++, we may get a TagDecl with the same name; in this case the 9586 // enum constant will 'hide' the tag. 9587 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9588 "Received TagDecl when not in C++!"); 9589 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9590 if (isa<EnumConstantDecl>(PrevDecl)) 9591 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9592 else 9593 Diag(IdLoc, diag::err_redefinition) << Id; 9594 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9595 return 0; 9596 } 9597 } 9598 9599 // C++ [class.mem]p13: 9600 // If T is the name of a class, then each of the following shall have a 9601 // name different from T: 9602 // - every enumerator of every member of class T that is an enumerated 9603 // type 9604 if (CXXRecordDecl *Record 9605 = dyn_cast<CXXRecordDecl>( 9606 TheEnumDecl->getDeclContext()->getRedeclContext())) 9607 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9608 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9609 9610 EnumConstantDecl *New = 9611 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9612 9613 if (New) { 9614 // Process attributes. 9615 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9616 9617 // Register this decl in the current scope stack. 9618 New->setAccess(TheEnumDecl->getAccess()); 9619 PushOnScopeChains(New, S); 9620 } 9621 9622 return New; 9623} 9624 9625void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9626 SourceLocation RBraceLoc, Decl *EnumDeclX, 9627 Decl **Elements, unsigned NumElements, 9628 Scope *S, AttributeList *Attr) { 9629 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9630 QualType EnumType = Context.getTypeDeclType(Enum); 9631 9632 if (Attr) 9633 ProcessDeclAttributeList(S, Enum, Attr); 9634 9635 if (Enum->isDependentType()) { 9636 for (unsigned i = 0; i != NumElements; ++i) { 9637 EnumConstantDecl *ECD = 9638 cast_or_null<EnumConstantDecl>(Elements[i]); 9639 if (!ECD) continue; 9640 9641 ECD->setType(EnumType); 9642 } 9643 9644 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9645 return; 9646 } 9647 9648 // TODO: If the result value doesn't fit in an int, it must be a long or long 9649 // long value. ISO C does not support this, but GCC does as an extension, 9650 // emit a warning. 9651 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9652 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9653 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9654 9655 // Verify that all the values are okay, compute the size of the values, and 9656 // reverse the list. 9657 unsigned NumNegativeBits = 0; 9658 unsigned NumPositiveBits = 0; 9659 9660 // Keep track of whether all elements have type int. 9661 bool AllElementsInt = true; 9662 9663 for (unsigned i = 0; i != NumElements; ++i) { 9664 EnumConstantDecl *ECD = 9665 cast_or_null<EnumConstantDecl>(Elements[i]); 9666 if (!ECD) continue; // Already issued a diagnostic. 9667 9668 const llvm::APSInt &InitVal = ECD->getInitVal(); 9669 9670 // Keep track of the size of positive and negative values. 9671 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9672 NumPositiveBits = std::max(NumPositiveBits, 9673 (unsigned)InitVal.getActiveBits()); 9674 else 9675 NumNegativeBits = std::max(NumNegativeBits, 9676 (unsigned)InitVal.getMinSignedBits()); 9677 9678 // Keep track of whether every enum element has type int (very commmon). 9679 if (AllElementsInt) 9680 AllElementsInt = ECD->getType() == Context.IntTy; 9681 } 9682 9683 // Figure out the type that should be used for this enum. 9684 QualType BestType; 9685 unsigned BestWidth; 9686 9687 // C++0x N3000 [conv.prom]p3: 9688 // An rvalue of an unscoped enumeration type whose underlying 9689 // type is not fixed can be converted to an rvalue of the first 9690 // of the following types that can represent all the values of 9691 // the enumeration: int, unsigned int, long int, unsigned long 9692 // int, long long int, or unsigned long long int. 9693 // C99 6.4.4.3p2: 9694 // An identifier declared as an enumeration constant has type int. 9695 // The C99 rule is modified by a gcc extension 9696 QualType BestPromotionType; 9697 9698 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9699 // -fshort-enums is the equivalent to specifying the packed attribute on all 9700 // enum definitions. 9701 if (LangOpts.ShortEnums) 9702 Packed = true; 9703 9704 if (Enum->isFixed()) { 9705 BestType = Enum->getIntegerType(); 9706 if (BestType->isPromotableIntegerType()) 9707 BestPromotionType = Context.getPromotedIntegerType(BestType); 9708 else 9709 BestPromotionType = BestType; 9710 // We don't need to set BestWidth, because BestType is going to be the type 9711 // of the enumerators, but we do anyway because otherwise some compilers 9712 // warn that it might be used uninitialized. 9713 BestWidth = CharWidth; 9714 } 9715 else if (NumNegativeBits) { 9716 // If there is a negative value, figure out the smallest integer type (of 9717 // int/long/longlong) that fits. 9718 // If it's packed, check also if it fits a char or a short. 9719 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9720 BestType = Context.SignedCharTy; 9721 BestWidth = CharWidth; 9722 } else if (Packed && NumNegativeBits <= ShortWidth && 9723 NumPositiveBits < ShortWidth) { 9724 BestType = Context.ShortTy; 9725 BestWidth = ShortWidth; 9726 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9727 BestType = Context.IntTy; 9728 BestWidth = IntWidth; 9729 } else { 9730 BestWidth = Context.getTargetInfo().getLongWidth(); 9731 9732 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9733 BestType = Context.LongTy; 9734 } else { 9735 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9736 9737 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9738 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9739 BestType = Context.LongLongTy; 9740 } 9741 } 9742 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9743 } else { 9744 // If there is no negative value, figure out the smallest type that fits 9745 // all of the enumerator values. 9746 // If it's packed, check also if it fits a char or a short. 9747 if (Packed && NumPositiveBits <= CharWidth) { 9748 BestType = Context.UnsignedCharTy; 9749 BestPromotionType = Context.IntTy; 9750 BestWidth = CharWidth; 9751 } else if (Packed && NumPositiveBits <= ShortWidth) { 9752 BestType = Context.UnsignedShortTy; 9753 BestPromotionType = Context.IntTy; 9754 BestWidth = ShortWidth; 9755 } else if (NumPositiveBits <= IntWidth) { 9756 BestType = Context.UnsignedIntTy; 9757 BestWidth = IntWidth; 9758 BestPromotionType 9759 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9760 ? Context.UnsignedIntTy : Context.IntTy; 9761 } else if (NumPositiveBits <= 9762 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9763 BestType = Context.UnsignedLongTy; 9764 BestPromotionType 9765 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9766 ? Context.UnsignedLongTy : Context.LongTy; 9767 } else { 9768 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9769 assert(NumPositiveBits <= BestWidth && 9770 "How could an initializer get larger than ULL?"); 9771 BestType = Context.UnsignedLongLongTy; 9772 BestPromotionType 9773 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9774 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9775 } 9776 } 9777 9778 // Loop over all of the enumerator constants, changing their types to match 9779 // the type of the enum if needed. 9780 for (unsigned i = 0; i != NumElements; ++i) { 9781 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9782 if (!ECD) continue; // Already issued a diagnostic. 9783 9784 // Standard C says the enumerators have int type, but we allow, as an 9785 // extension, the enumerators to be larger than int size. If each 9786 // enumerator value fits in an int, type it as an int, otherwise type it the 9787 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9788 // that X has type 'int', not 'unsigned'. 9789 9790 // Determine whether the value fits into an int. 9791 llvm::APSInt InitVal = ECD->getInitVal(); 9792 9793 // If it fits into an integer type, force it. Otherwise force it to match 9794 // the enum decl type. 9795 QualType NewTy; 9796 unsigned NewWidth; 9797 bool NewSign; 9798 if (!getLangOptions().CPlusPlus && 9799 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9800 NewTy = Context.IntTy; 9801 NewWidth = IntWidth; 9802 NewSign = true; 9803 } else if (ECD->getType() == BestType) { 9804 // Already the right type! 9805 if (getLangOptions().CPlusPlus) 9806 // C++ [dcl.enum]p4: Following the closing brace of an 9807 // enum-specifier, each enumerator has the type of its 9808 // enumeration. 9809 ECD->setType(EnumType); 9810 continue; 9811 } else { 9812 NewTy = BestType; 9813 NewWidth = BestWidth; 9814 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9815 } 9816 9817 // Adjust the APSInt value. 9818 InitVal = InitVal.extOrTrunc(NewWidth); 9819 InitVal.setIsSigned(NewSign); 9820 ECD->setInitVal(InitVal); 9821 9822 // Adjust the Expr initializer and type. 9823 if (ECD->getInitExpr() && 9824 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9825 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9826 CK_IntegralCast, 9827 ECD->getInitExpr(), 9828 /*base paths*/ 0, 9829 VK_RValue)); 9830 if (getLangOptions().CPlusPlus) 9831 // C++ [dcl.enum]p4: Following the closing brace of an 9832 // enum-specifier, each enumerator has the type of its 9833 // enumeration. 9834 ECD->setType(EnumType); 9835 else 9836 ECD->setType(NewTy); 9837 } 9838 9839 Enum->completeDefinition(BestType, BestPromotionType, 9840 NumPositiveBits, NumNegativeBits); 9841} 9842 9843Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9844 SourceLocation StartLoc, 9845 SourceLocation EndLoc) { 9846 StringLiteral *AsmString = cast<StringLiteral>(expr); 9847 9848 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9849 AsmString, StartLoc, 9850 EndLoc); 9851 CurContext->addDecl(New); 9852 return New; 9853} 9854 9855DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9856 IdentifierInfo &ModuleName, 9857 SourceLocation ModuleNameLoc) { 9858 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9859 ModuleName, ModuleNameLoc); 9860 if (!Module) 9861 return true; 9862 9863 // FIXME: Actually create a declaration to describe the module import. 9864 (void)Module; 9865 return DeclResult((Decl *)0); 9866} 9867 9868void 9869Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9870 SourceLocation ModulePrivateKeyword) { 9871 assert(!Old->isModulePrivate() && "Old is module-private!"); 9872 9873 Diag(New->getLocation(), diag::err_module_private_follows_public) 9874 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9875 Diag(Old->getLocation(), diag::note_previous_declaration) 9876 << Old->getDeclName(); 9877 9878 // Drop the __module_private__ from the new declaration, since it's invalid. 9879 New->setModulePrivate(false); 9880} 9881 9882void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9883 SourceLocation PragmaLoc, 9884 SourceLocation NameLoc) { 9885 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9886 9887 if (PrevDecl) { 9888 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9889 } else { 9890 (void)WeakUndeclaredIdentifiers.insert( 9891 std::pair<IdentifierInfo*,WeakInfo> 9892 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9893 } 9894} 9895 9896void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9897 IdentifierInfo* AliasName, 9898 SourceLocation PragmaLoc, 9899 SourceLocation NameLoc, 9900 SourceLocation AliasNameLoc) { 9901 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9902 LookupOrdinaryName); 9903 WeakInfo W = WeakInfo(Name, NameLoc); 9904 9905 if (PrevDecl) { 9906 if (!PrevDecl->hasAttr<AliasAttr>()) 9907 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9908 DeclApplyPragmaWeak(TUScope, ND, W); 9909 } else { 9910 (void)WeakUndeclaredIdentifiers.insert( 9911 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9912 } 9913} 9914 9915Decl *Sema::getObjCDeclContext() const { 9916 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9917} 9918 9919AvailabilityResult Sema::getCurContextAvailability() const { 9920 const Decl *D = cast<Decl>(getCurLexicalContext()); 9921 // A category implicitly has the availability of the interface. 9922 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9923 D = CatD->getClassInterface(); 9924 9925 return D->getAvailability(); 9926} 9927