SemaDecl.cpp revision d778105d47d92af4bf74f3e3019ca74ab0d78986
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo, 75 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 421 .get(); 422 } else { 423 assert(SS && SS->isInvalid() && 424 "Invalid scope specifier has already been diagnosed"); 425 } 426 427 return true; 428} 429 430/// \brief Determine whether the given result set contains either a type name 431/// or 432static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 433 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 434 NextToken.is(tok::less); 435 436 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 437 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 438 return true; 439 440 if (CheckTemplate && isa<TemplateDecl>(*I)) 441 return true; 442 } 443 444 return false; 445} 446 447Sema::NameClassification Sema::ClassifyName(Scope *S, 448 CXXScopeSpec &SS, 449 IdentifierInfo *&Name, 450 SourceLocation NameLoc, 451 const Token &NextToken) { 452 DeclarationNameInfo NameInfo(Name, NameLoc); 453 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 454 455 if (NextToken.is(tok::coloncolon)) { 456 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 457 QualType(), false, SS, 0, false); 458 459 } 460 461 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 462 LookupParsedName(Result, S, &SS, !CurMethod); 463 464 // Perform lookup for Objective-C instance variables (including automatically 465 // synthesized instance variables), if we're in an Objective-C method. 466 // FIXME: This lookup really, really needs to be folded in to the normal 467 // unqualified lookup mechanism. 468 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 469 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 470 if (E.get() || E.isInvalid()) 471 return E; 472 } 473 474 bool SecondTry = false; 475 bool IsFilteredTemplateName = false; 476 477Corrected: 478 switch (Result.getResultKind()) { 479 case LookupResult::NotFound: 480 // If an unqualified-id is followed by a '(', then we have a function 481 // call. 482 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 483 // In C++, this is an ADL-only call. 484 // FIXME: Reference? 485 if (getLangOptions().CPlusPlus) 486 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 487 488 // C90 6.3.2.2: 489 // If the expression that precedes the parenthesized argument list in a 490 // function call consists solely of an identifier, and if no 491 // declaration is visible for this identifier, the identifier is 492 // implicitly declared exactly as if, in the innermost block containing 493 // the function call, the declaration 494 // 495 // extern int identifier (); 496 // 497 // appeared. 498 // 499 // We also allow this in C99 as an extension. 500 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 501 Result.addDecl(D); 502 Result.resolveKind(); 503 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 504 } 505 } 506 507 // In C, we first see whether there is a tag type by the same name, in 508 // which case it's likely that the user just forget to write "enum", 509 // "struct", or "union". 510 if (!getLangOptions().CPlusPlus && !SecondTry) { 511 Result.clear(LookupTagName); 512 LookupParsedName(Result, S, &SS); 513 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 514 const char *TagName = 0; 515 const char *FixItTagName = 0; 516 switch (Tag->getTagKind()) { 517 case TTK_Class: 518 TagName = "class"; 519 FixItTagName = "class "; 520 break; 521 522 case TTK_Enum: 523 TagName = "enum"; 524 FixItTagName = "enum "; 525 break; 526 527 case TTK_Struct: 528 TagName = "struct"; 529 FixItTagName = "struct "; 530 break; 531 532 case TTK_Union: 533 TagName = "union"; 534 FixItTagName = "union "; 535 break; 536 } 537 538 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 539 << Name << TagName << getLangOptions().CPlusPlus 540 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 541 break; 542 } 543 544 Result.clear(LookupOrdinaryName); 545 } 546 547 // Perform typo correction to determine if there is another name that is 548 // close to this name. 549 if (!SecondTry) { 550 SecondTry = true; 551 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 552 Result.getLookupKind(), S, 553 &SS)) { 554 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 555 unsigned QualifiedDiag = diag::err_no_member_suggest; 556 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 557 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 558 559 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 560 NamedDecl *UnderlyingFirstDecl 561 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 562 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 563 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 564 UnqualifiedDiag = diag::err_no_template_suggest; 565 QualifiedDiag = diag::err_no_member_template_suggest; 566 } else if (UnderlyingFirstDecl && 567 (isa<TypeDecl>(UnderlyingFirstDecl) || 568 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 569 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 570 UnqualifiedDiag = diag::err_unknown_typename_suggest; 571 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 572 } 573 574 if (SS.isEmpty()) 575 Diag(NameLoc, UnqualifiedDiag) 576 << Name << CorrectedQuotedStr 577 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 578 else 579 Diag(NameLoc, QualifiedDiag) 580 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 581 << SS.getRange() 582 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 583 584 // Update the name, so that the caller has the new name. 585 Name = Corrected.getCorrectionAsIdentifierInfo(); 586 587 // Also update the LookupResult... 588 // FIXME: This should probably go away at some point 589 Result.clear(); 590 Result.setLookupName(Corrected.getCorrection()); 591 if (FirstDecl) Result.addDecl(FirstDecl); 592 593 // Typo correction corrected to a keyword. 594 if (Corrected.isKeyword()) 595 return Corrected.getCorrectionAsIdentifierInfo(); 596 597 if (FirstDecl) 598 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 599 << CorrectedQuotedStr; 600 601 // If we found an Objective-C instance variable, let 602 // LookupInObjCMethod build the appropriate expression to 603 // reference the ivar. 604 // FIXME: This is a gross hack. 605 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 606 Result.clear(); 607 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 608 return move(E); 609 } 610 611 goto Corrected; 612 } 613 } 614 615 // We failed to correct; just fall through and let the parser deal with it. 616 Result.suppressDiagnostics(); 617 return NameClassification::Unknown(); 618 619 case LookupResult::NotFoundInCurrentInstantiation: 620 // We performed name lookup into the current instantiation, and there were 621 // dependent bases, so we treat this result the same way as any other 622 // dependent nested-name-specifier. 623 624 // C++ [temp.res]p2: 625 // A name used in a template declaration or definition and that is 626 // dependent on a template-parameter is assumed not to name a type 627 // unless the applicable name lookup finds a type name or the name is 628 // qualified by the keyword typename. 629 // 630 // FIXME: If the next token is '<', we might want to ask the parser to 631 // perform some heroics to see if we actually have a 632 // template-argument-list, which would indicate a missing 'template' 633 // keyword here. 634 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 635 636 case LookupResult::Found: 637 case LookupResult::FoundOverloaded: 638 case LookupResult::FoundUnresolvedValue: 639 break; 640 641 case LookupResult::Ambiguous: 642 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 643 hasAnyAcceptableTemplateNames(Result)) { 644 // C++ [temp.local]p3: 645 // A lookup that finds an injected-class-name (10.2) can result in an 646 // ambiguity in certain cases (for example, if it is found in more than 647 // one base class). If all of the injected-class-names that are found 648 // refer to specializations of the same class template, and if the name 649 // is followed by a template-argument-list, the reference refers to the 650 // class template itself and not a specialization thereof, and is not 651 // ambiguous. 652 // 653 // This filtering can make an ambiguous result into an unambiguous one, 654 // so try again after filtering out template names. 655 FilterAcceptableTemplateNames(Result); 656 if (!Result.isAmbiguous()) { 657 IsFilteredTemplateName = true; 658 break; 659 } 660 } 661 662 // Diagnose the ambiguity and return an error. 663 return NameClassification::Error(); 664 } 665 666 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 667 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 668 // C++ [temp.names]p3: 669 // After name lookup (3.4) finds that a name is a template-name or that 670 // an operator-function-id or a literal- operator-id refers to a set of 671 // overloaded functions any member of which is a function template if 672 // this is followed by a <, the < is always taken as the delimiter of a 673 // template-argument-list and never as the less-than operator. 674 if (!IsFilteredTemplateName) 675 FilterAcceptableTemplateNames(Result); 676 677 if (!Result.empty()) { 678 bool IsFunctionTemplate; 679 TemplateName Template; 680 if (Result.end() - Result.begin() > 1) { 681 IsFunctionTemplate = true; 682 Template = Context.getOverloadedTemplateName(Result.begin(), 683 Result.end()); 684 } else { 685 TemplateDecl *TD 686 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 687 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 688 689 if (SS.isSet() && !SS.isInvalid()) 690 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 691 /*TemplateKeyword=*/false, 692 TD); 693 else 694 Template = TemplateName(TD); 695 } 696 697 if (IsFunctionTemplate) { 698 // Function templates always go through overload resolution, at which 699 // point we'll perform the various checks (e.g., accessibility) we need 700 // to based on which function we selected. 701 Result.suppressDiagnostics(); 702 703 return NameClassification::FunctionTemplate(Template); 704 } 705 706 return NameClassification::TypeTemplate(Template); 707 } 708 } 709 710 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 711 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 712 DiagnoseUseOfDecl(Type, NameLoc); 713 QualType T = Context.getTypeDeclType(Type); 714 return ParsedType::make(T); 715 } 716 717 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 718 if (!Class) { 719 // FIXME: It's unfortunate that we don't have a Type node for handling this. 720 if (ObjCCompatibleAliasDecl *Alias 721 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 722 Class = Alias->getClassInterface(); 723 } 724 725 if (Class) { 726 DiagnoseUseOfDecl(Class, NameLoc); 727 728 if (NextToken.is(tok::period)) { 729 // Interface. <something> is parsed as a property reference expression. 730 // Just return "unknown" as a fall-through for now. 731 Result.suppressDiagnostics(); 732 return NameClassification::Unknown(); 733 } 734 735 QualType T = Context.getObjCInterfaceType(Class); 736 return ParsedType::make(T); 737 } 738 739 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 740 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 741 742 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 743 return BuildDeclarationNameExpr(SS, Result, ADL); 744} 745 746// Determines the context to return to after temporarily entering a 747// context. This depends in an unnecessarily complicated way on the 748// exact ordering of callbacks from the parser. 749DeclContext *Sema::getContainingDC(DeclContext *DC) { 750 751 // Functions defined inline within classes aren't parsed until we've 752 // finished parsing the top-level class, so the top-level class is 753 // the context we'll need to return to. 754 if (isa<FunctionDecl>(DC)) { 755 DC = DC->getLexicalParent(); 756 757 // A function not defined within a class will always return to its 758 // lexical context. 759 if (!isa<CXXRecordDecl>(DC)) 760 return DC; 761 762 // A C++ inline method/friend is parsed *after* the topmost class 763 // it was declared in is fully parsed ("complete"); the topmost 764 // class is the context we need to return to. 765 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 766 DC = RD; 767 768 // Return the declaration context of the topmost class the inline method is 769 // declared in. 770 return DC; 771 } 772 773 return DC->getLexicalParent(); 774} 775 776void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 777 assert(getContainingDC(DC) == CurContext && 778 "The next DeclContext should be lexically contained in the current one."); 779 CurContext = DC; 780 S->setEntity(DC); 781} 782 783void Sema::PopDeclContext() { 784 assert(CurContext && "DeclContext imbalance!"); 785 786 CurContext = getContainingDC(CurContext); 787 assert(CurContext && "Popped translation unit!"); 788} 789 790/// EnterDeclaratorContext - Used when we must lookup names in the context 791/// of a declarator's nested name specifier. 792/// 793void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 794 // C++0x [basic.lookup.unqual]p13: 795 // A name used in the definition of a static data member of class 796 // X (after the qualified-id of the static member) is looked up as 797 // if the name was used in a member function of X. 798 // C++0x [basic.lookup.unqual]p14: 799 // If a variable member of a namespace is defined outside of the 800 // scope of its namespace then any name used in the definition of 801 // the variable member (after the declarator-id) is looked up as 802 // if the definition of the variable member occurred in its 803 // namespace. 804 // Both of these imply that we should push a scope whose context 805 // is the semantic context of the declaration. We can't use 806 // PushDeclContext here because that context is not necessarily 807 // lexically contained in the current context. Fortunately, 808 // the containing scope should have the appropriate information. 809 810 assert(!S->getEntity() && "scope already has entity"); 811 812#ifndef NDEBUG 813 Scope *Ancestor = S->getParent(); 814 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 815 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 816#endif 817 818 CurContext = DC; 819 S->setEntity(DC); 820} 821 822void Sema::ExitDeclaratorContext(Scope *S) { 823 assert(S->getEntity() == CurContext && "Context imbalance!"); 824 825 // Switch back to the lexical context. The safety of this is 826 // enforced by an assert in EnterDeclaratorContext. 827 Scope *Ancestor = S->getParent(); 828 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 829 CurContext = (DeclContext*) Ancestor->getEntity(); 830 831 // We don't need to do anything with the scope, which is going to 832 // disappear. 833} 834 835 836void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 837 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 838 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 839 // We assume that the caller has already called 840 // ActOnReenterTemplateScope 841 FD = TFD->getTemplatedDecl(); 842 } 843 if (!FD) 844 return; 845 846 PushDeclContext(S, FD); 847 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 848 ParmVarDecl *Param = FD->getParamDecl(P); 849 // If the parameter has an identifier, then add it to the scope 850 if (Param->getIdentifier()) { 851 S->AddDecl(Param); 852 IdResolver.AddDecl(Param); 853 } 854 } 855} 856 857 858/// \brief Determine whether we allow overloading of the function 859/// PrevDecl with another declaration. 860/// 861/// This routine determines whether overloading is possible, not 862/// whether some new function is actually an overload. It will return 863/// true in C++ (where we can always provide overloads) or, as an 864/// extension, in C when the previous function is already an 865/// overloaded function declaration or has the "overloadable" 866/// attribute. 867static bool AllowOverloadingOfFunction(LookupResult &Previous, 868 ASTContext &Context) { 869 if (Context.getLangOptions().CPlusPlus) 870 return true; 871 872 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 873 return true; 874 875 return (Previous.getResultKind() == LookupResult::Found 876 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 877} 878 879/// Add this decl to the scope shadowed decl chains. 880void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 881 // Move up the scope chain until we find the nearest enclosing 882 // non-transparent context. The declaration will be introduced into this 883 // scope. 884 while (S->getEntity() && 885 ((DeclContext *)S->getEntity())->isTransparentContext()) 886 S = S->getParent(); 887 888 // Add scoped declarations into their context, so that they can be 889 // found later. Declarations without a context won't be inserted 890 // into any context. 891 if (AddToContext) 892 CurContext->addDecl(D); 893 894 // Out-of-line definitions shouldn't be pushed into scope in C++. 895 // Out-of-line variable and function definitions shouldn't even in C. 896 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 897 D->isOutOfLine() && 898 !D->getDeclContext()->getRedeclContext()->Equals( 899 D->getLexicalDeclContext()->getRedeclContext())) 900 return; 901 902 // Template instantiations should also not be pushed into scope. 903 if (isa<FunctionDecl>(D) && 904 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 905 return; 906 907 // If this replaces anything in the current scope, 908 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 909 IEnd = IdResolver.end(); 910 for (; I != IEnd; ++I) { 911 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 912 S->RemoveDecl(*I); 913 IdResolver.RemoveDecl(*I); 914 915 // Should only need to replace one decl. 916 break; 917 } 918 } 919 920 S->AddDecl(D); 921 922 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 923 // Implicitly-generated labels may end up getting generated in an order that 924 // isn't strictly lexical, which breaks name lookup. Be careful to insert 925 // the label at the appropriate place in the identifier chain. 926 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 927 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 928 if (IDC == CurContext) { 929 if (!S->isDeclScope(*I)) 930 continue; 931 } else if (IDC->Encloses(CurContext)) 932 break; 933 } 934 935 IdResolver.InsertDeclAfter(I, D); 936 } else { 937 IdResolver.AddDecl(D); 938 } 939} 940 941void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 942 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 943 TUScope->AddDecl(D); 944} 945 946bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 947 bool ExplicitInstantiationOrSpecialization) { 948 return IdResolver.isDeclInScope(D, Ctx, Context, S, 949 ExplicitInstantiationOrSpecialization); 950} 951 952Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 953 DeclContext *TargetDC = DC->getPrimaryContext(); 954 do { 955 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 956 if (ScopeDC->getPrimaryContext() == TargetDC) 957 return S; 958 } while ((S = S->getParent())); 959 960 return 0; 961} 962 963static bool isOutOfScopePreviousDeclaration(NamedDecl *, 964 DeclContext*, 965 ASTContext&); 966 967/// Filters out lookup results that don't fall within the given scope 968/// as determined by isDeclInScope. 969void Sema::FilterLookupForScope(LookupResult &R, 970 DeclContext *Ctx, Scope *S, 971 bool ConsiderLinkage, 972 bool ExplicitInstantiationOrSpecialization) { 973 LookupResult::Filter F = R.makeFilter(); 974 while (F.hasNext()) { 975 NamedDecl *D = F.next(); 976 977 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 978 continue; 979 980 if (ConsiderLinkage && 981 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 982 continue; 983 984 F.erase(); 985 } 986 987 F.done(); 988} 989 990static bool isUsingDecl(NamedDecl *D) { 991 return isa<UsingShadowDecl>(D) || 992 isa<UnresolvedUsingTypenameDecl>(D) || 993 isa<UnresolvedUsingValueDecl>(D); 994} 995 996/// Removes using shadow declarations from the lookup results. 997static void RemoveUsingDecls(LookupResult &R) { 998 LookupResult::Filter F = R.makeFilter(); 999 while (F.hasNext()) 1000 if (isUsingDecl(F.next())) 1001 F.erase(); 1002 1003 F.done(); 1004} 1005 1006/// \brief Check for this common pattern: 1007/// @code 1008/// class S { 1009/// S(const S&); // DO NOT IMPLEMENT 1010/// void operator=(const S&); // DO NOT IMPLEMENT 1011/// }; 1012/// @endcode 1013static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1014 // FIXME: Should check for private access too but access is set after we get 1015 // the decl here. 1016 if (D->doesThisDeclarationHaveABody()) 1017 return false; 1018 1019 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1020 return CD->isCopyConstructor(); 1021 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1022 return Method->isCopyAssignmentOperator(); 1023 return false; 1024} 1025 1026bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1027 assert(D); 1028 1029 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1030 return false; 1031 1032 // Ignore class templates. 1033 if (D->getDeclContext()->isDependentContext() || 1034 D->getLexicalDeclContext()->isDependentContext()) 1035 return false; 1036 1037 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1038 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1039 return false; 1040 1041 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1042 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1043 return false; 1044 } else { 1045 // 'static inline' functions are used in headers; don't warn. 1046 if (FD->getStorageClass() == SC_Static && 1047 FD->isInlineSpecified()) 1048 return false; 1049 } 1050 1051 if (FD->doesThisDeclarationHaveABody() && 1052 Context.DeclMustBeEmitted(FD)) 1053 return false; 1054 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1055 if (!VD->isFileVarDecl() || 1056 VD->getType().isConstant(Context) || 1057 Context.DeclMustBeEmitted(VD)) 1058 return false; 1059 1060 if (VD->isStaticDataMember() && 1061 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1062 return false; 1063 1064 } else { 1065 return false; 1066 } 1067 1068 // Only warn for unused decls internal to the translation unit. 1069 if (D->getLinkage() == ExternalLinkage) 1070 return false; 1071 1072 return true; 1073} 1074 1075void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1076 if (!D) 1077 return; 1078 1079 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1080 const FunctionDecl *First = FD->getFirstDeclaration(); 1081 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1082 return; // First should already be in the vector. 1083 } 1084 1085 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1086 const VarDecl *First = VD->getFirstDeclaration(); 1087 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1088 return; // First should already be in the vector. 1089 } 1090 1091 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1092 UnusedFileScopedDecls.push_back(D); 1093 } 1094 1095static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1096 if (D->isInvalidDecl()) 1097 return false; 1098 1099 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1100 return false; 1101 1102 if (isa<LabelDecl>(D)) 1103 return true; 1104 1105 // White-list anything that isn't a local variable. 1106 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1107 !D->getDeclContext()->isFunctionOrMethod()) 1108 return false; 1109 1110 // Types of valid local variables should be complete, so this should succeed. 1111 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1112 1113 // White-list anything with an __attribute__((unused)) type. 1114 QualType Ty = VD->getType(); 1115 1116 // Only look at the outermost level of typedef. 1117 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1118 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1119 return false; 1120 } 1121 1122 // If we failed to complete the type for some reason, or if the type is 1123 // dependent, don't diagnose the variable. 1124 if (Ty->isIncompleteType() || Ty->isDependentType()) 1125 return false; 1126 1127 if (const TagType *TT = Ty->getAs<TagType>()) { 1128 const TagDecl *Tag = TT->getDecl(); 1129 if (Tag->hasAttr<UnusedAttr>()) 1130 return false; 1131 1132 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1133 // FIXME: Checking for the presence of a user-declared constructor 1134 // isn't completely accurate; we'd prefer to check that the initializer 1135 // has no side effects. 1136 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1137 return false; 1138 } 1139 } 1140 1141 // TODO: __attribute__((unused)) templates? 1142 } 1143 1144 return true; 1145} 1146 1147static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1148 FixItHint &Hint) { 1149 if (isa<LabelDecl>(D)) { 1150 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1151 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1152 if (AfterColon.isInvalid()) 1153 return; 1154 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1155 getCharRange(D->getLocStart(), AfterColon)); 1156 } 1157 return; 1158} 1159 1160/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1161/// unless they are marked attr(unused). 1162void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1163 FixItHint Hint; 1164 if (!ShouldDiagnoseUnusedDecl(D)) 1165 return; 1166 1167 GenerateFixForUnusedDecl(D, Context, Hint); 1168 1169 unsigned DiagID; 1170 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1171 DiagID = diag::warn_unused_exception_param; 1172 else if (isa<LabelDecl>(D)) 1173 DiagID = diag::warn_unused_label; 1174 else 1175 DiagID = diag::warn_unused_variable; 1176 1177 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1178} 1179 1180static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1181 // Verify that we have no forward references left. If so, there was a goto 1182 // or address of a label taken, but no definition of it. Label fwd 1183 // definitions are indicated with a null substmt. 1184 if (L->getStmt() == 0) 1185 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1186} 1187 1188void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1189 if (S->decl_empty()) return; 1190 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1191 "Scope shouldn't contain decls!"); 1192 1193 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1194 I != E; ++I) { 1195 Decl *TmpD = (*I); 1196 assert(TmpD && "This decl didn't get pushed??"); 1197 1198 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1199 NamedDecl *D = cast<NamedDecl>(TmpD); 1200 1201 if (!D->getDeclName()) continue; 1202 1203 // Diagnose unused variables in this scope. 1204 if (!S->hasErrorOccurred()) 1205 DiagnoseUnusedDecl(D); 1206 1207 // If this was a forward reference to a label, verify it was defined. 1208 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1209 CheckPoppedLabel(LD, *this); 1210 1211 // Remove this name from our lexical scope. 1212 IdResolver.RemoveDecl(D); 1213 } 1214} 1215 1216/// \brief Look for an Objective-C class in the translation unit. 1217/// 1218/// \param Id The name of the Objective-C class we're looking for. If 1219/// typo-correction fixes this name, the Id will be updated 1220/// to the fixed name. 1221/// 1222/// \param IdLoc The location of the name in the translation unit. 1223/// 1224/// \param TypoCorrection If true, this routine will attempt typo correction 1225/// if there is no class with the given name. 1226/// 1227/// \returns The declaration of the named Objective-C class, or NULL if the 1228/// class could not be found. 1229ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1230 SourceLocation IdLoc, 1231 bool DoTypoCorrection) { 1232 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1233 // creation from this context. 1234 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1235 1236 if (!IDecl && DoTypoCorrection) { 1237 // Perform typo correction at the given location, but only if we 1238 // find an Objective-C class name. 1239 TypoCorrection C; 1240 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1241 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1242 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1243 Diag(IdLoc, diag::err_undef_interface_suggest) 1244 << Id << IDecl->getDeclName() 1245 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1246 Diag(IDecl->getLocation(), diag::note_previous_decl) 1247 << IDecl->getDeclName(); 1248 1249 Id = IDecl->getIdentifier(); 1250 } 1251 } 1252 1253 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1254} 1255 1256/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1257/// from S, where a non-field would be declared. This routine copes 1258/// with the difference between C and C++ scoping rules in structs and 1259/// unions. For example, the following code is well-formed in C but 1260/// ill-formed in C++: 1261/// @code 1262/// struct S6 { 1263/// enum { BAR } e; 1264/// }; 1265/// 1266/// void test_S6() { 1267/// struct S6 a; 1268/// a.e = BAR; 1269/// } 1270/// @endcode 1271/// For the declaration of BAR, this routine will return a different 1272/// scope. The scope S will be the scope of the unnamed enumeration 1273/// within S6. In C++, this routine will return the scope associated 1274/// with S6, because the enumeration's scope is a transparent 1275/// context but structures can contain non-field names. In C, this 1276/// routine will return the translation unit scope, since the 1277/// enumeration's scope is a transparent context and structures cannot 1278/// contain non-field names. 1279Scope *Sema::getNonFieldDeclScope(Scope *S) { 1280 while (((S->getFlags() & Scope::DeclScope) == 0) || 1281 (S->getEntity() && 1282 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1283 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1284 S = S->getParent(); 1285 return S; 1286} 1287 1288/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1289/// file scope. lazily create a decl for it. ForRedeclaration is true 1290/// if we're creating this built-in in anticipation of redeclaring the 1291/// built-in. 1292NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1293 Scope *S, bool ForRedeclaration, 1294 SourceLocation Loc) { 1295 Builtin::ID BID = (Builtin::ID)bid; 1296 1297 ASTContext::GetBuiltinTypeError Error; 1298 QualType R = Context.GetBuiltinType(BID, Error); 1299 switch (Error) { 1300 case ASTContext::GE_None: 1301 // Okay 1302 break; 1303 1304 case ASTContext::GE_Missing_stdio: 1305 if (ForRedeclaration) 1306 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1307 << Context.BuiltinInfo.GetName(BID); 1308 return 0; 1309 1310 case ASTContext::GE_Missing_setjmp: 1311 if (ForRedeclaration) 1312 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1313 << Context.BuiltinInfo.GetName(BID); 1314 return 0; 1315 } 1316 1317 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1318 Diag(Loc, diag::ext_implicit_lib_function_decl) 1319 << Context.BuiltinInfo.GetName(BID) 1320 << R; 1321 if (Context.BuiltinInfo.getHeaderName(BID) && 1322 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1323 != DiagnosticsEngine::Ignored) 1324 Diag(Loc, diag::note_please_include_header) 1325 << Context.BuiltinInfo.getHeaderName(BID) 1326 << Context.BuiltinInfo.GetName(BID); 1327 } 1328 1329 FunctionDecl *New = FunctionDecl::Create(Context, 1330 Context.getTranslationUnitDecl(), 1331 Loc, Loc, II, R, /*TInfo=*/0, 1332 SC_Extern, 1333 SC_None, false, 1334 /*hasPrototype=*/true); 1335 New->setImplicit(); 1336 1337 // Create Decl objects for each parameter, adding them to the 1338 // FunctionDecl. 1339 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1340 SmallVector<ParmVarDecl*, 16> Params; 1341 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1342 ParmVarDecl *parm = 1343 ParmVarDecl::Create(Context, New, SourceLocation(), 1344 SourceLocation(), 0, 1345 FT->getArgType(i), /*TInfo=*/0, 1346 SC_None, SC_None, 0); 1347 parm->setScopeInfo(0, i); 1348 Params.push_back(parm); 1349 } 1350 New->setParams(Params); 1351 } 1352 1353 AddKnownFunctionAttributes(New); 1354 1355 // TUScope is the translation-unit scope to insert this function into. 1356 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1357 // relate Scopes to DeclContexts, and probably eliminate CurContext 1358 // entirely, but we're not there yet. 1359 DeclContext *SavedContext = CurContext; 1360 CurContext = Context.getTranslationUnitDecl(); 1361 PushOnScopeChains(New, TUScope); 1362 CurContext = SavedContext; 1363 return New; 1364} 1365 1366/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1367/// same name and scope as a previous declaration 'Old'. Figure out 1368/// how to resolve this situation, merging decls or emitting 1369/// diagnostics as appropriate. If there was an error, set New to be invalid. 1370/// 1371void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1372 // If the new decl is known invalid already, don't bother doing any 1373 // merging checks. 1374 if (New->isInvalidDecl()) return; 1375 1376 // Allow multiple definitions for ObjC built-in typedefs. 1377 // FIXME: Verify the underlying types are equivalent! 1378 if (getLangOptions().ObjC1) { 1379 const IdentifierInfo *TypeID = New->getIdentifier(); 1380 switch (TypeID->getLength()) { 1381 default: break; 1382 case 2: 1383 if (!TypeID->isStr("id")) 1384 break; 1385 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1386 // Install the built-in type for 'id', ignoring the current definition. 1387 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1388 return; 1389 case 5: 1390 if (!TypeID->isStr("Class")) 1391 break; 1392 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1393 // Install the built-in type for 'Class', ignoring the current definition. 1394 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1395 return; 1396 case 3: 1397 if (!TypeID->isStr("SEL")) 1398 break; 1399 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1400 // Install the built-in type for 'SEL', ignoring the current definition. 1401 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1402 return; 1403 } 1404 // Fall through - the typedef name was not a builtin type. 1405 } 1406 1407 // Verify the old decl was also a type. 1408 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1409 if (!Old) { 1410 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1411 << New->getDeclName(); 1412 1413 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1414 if (OldD->getLocation().isValid()) 1415 Diag(OldD->getLocation(), diag::note_previous_definition); 1416 1417 return New->setInvalidDecl(); 1418 } 1419 1420 // If the old declaration is invalid, just give up here. 1421 if (Old->isInvalidDecl()) 1422 return New->setInvalidDecl(); 1423 1424 // Determine the "old" type we'll use for checking and diagnostics. 1425 QualType OldType; 1426 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1427 OldType = OldTypedef->getUnderlyingType(); 1428 else 1429 OldType = Context.getTypeDeclType(Old); 1430 1431 // If the typedef types are not identical, reject them in all languages and 1432 // with any extensions enabled. 1433 1434 if (OldType != New->getUnderlyingType() && 1435 Context.getCanonicalType(OldType) != 1436 Context.getCanonicalType(New->getUnderlyingType())) { 1437 int Kind = 0; 1438 if (isa<TypeAliasDecl>(Old)) 1439 Kind = 1; 1440 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1441 << Kind << New->getUnderlyingType() << OldType; 1442 if (Old->getLocation().isValid()) 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 return New->setInvalidDecl(); 1445 } 1446 1447 // The types match. Link up the redeclaration chain if the old 1448 // declaration was a typedef. 1449 // FIXME: this is a potential source of weirdness if the type 1450 // spellings don't match exactly. 1451 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1452 New->setPreviousDeclaration(Typedef); 1453 1454 // __module_private__ is propagated to later declarations. 1455 if (Old->isModulePrivate()) 1456 New->setModulePrivate(); 1457 else if (New->isModulePrivate()) 1458 diagnoseModulePrivateRedeclaration(New, Old); 1459 1460 if (getLangOptions().MicrosoftExt) 1461 return; 1462 1463 if (getLangOptions().CPlusPlus) { 1464 // C++ [dcl.typedef]p2: 1465 // In a given non-class scope, a typedef specifier can be used to 1466 // redefine the name of any type declared in that scope to refer 1467 // to the type to which it already refers. 1468 if (!isa<CXXRecordDecl>(CurContext)) 1469 return; 1470 1471 // C++0x [dcl.typedef]p4: 1472 // In a given class scope, a typedef specifier can be used to redefine 1473 // any class-name declared in that scope that is not also a typedef-name 1474 // to refer to the type to which it already refers. 1475 // 1476 // This wording came in via DR424, which was a correction to the 1477 // wording in DR56, which accidentally banned code like: 1478 // 1479 // struct S { 1480 // typedef struct A { } A; 1481 // }; 1482 // 1483 // in the C++03 standard. We implement the C++0x semantics, which 1484 // allow the above but disallow 1485 // 1486 // struct S { 1487 // typedef int I; 1488 // typedef int I; 1489 // }; 1490 // 1491 // since that was the intent of DR56. 1492 if (!isa<TypedefNameDecl>(Old)) 1493 return; 1494 1495 Diag(New->getLocation(), diag::err_redefinition) 1496 << New->getDeclName(); 1497 Diag(Old->getLocation(), diag::note_previous_definition); 1498 return New->setInvalidDecl(); 1499 } 1500 1501 // If we have a redefinition of a typedef in C, emit a warning. This warning 1502 // is normally mapped to an error, but can be controlled with 1503 // -Wtypedef-redefinition. If either the original or the redefinition is 1504 // in a system header, don't emit this for compatibility with GCC. 1505 if (getDiagnostics().getSuppressSystemWarnings() && 1506 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1507 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1508 return; 1509 1510 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1511 << New->getDeclName(); 1512 Diag(Old->getLocation(), diag::note_previous_definition); 1513 return; 1514} 1515 1516/// DeclhasAttr - returns true if decl Declaration already has the target 1517/// attribute. 1518static bool 1519DeclHasAttr(const Decl *D, const Attr *A) { 1520 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1521 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1522 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1523 if ((*i)->getKind() == A->getKind()) { 1524 if (Ann) { 1525 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1526 return true; 1527 continue; 1528 } 1529 // FIXME: Don't hardcode this check 1530 if (OA && isa<OwnershipAttr>(*i)) 1531 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1532 return true; 1533 } 1534 1535 return false; 1536} 1537 1538/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1539static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1540 ASTContext &C, bool mergeDeprecation = true) { 1541 if (!oldDecl->hasAttrs()) 1542 return; 1543 1544 bool foundAny = newDecl->hasAttrs(); 1545 1546 // Ensure that any moving of objects within the allocated map is done before 1547 // we process them. 1548 if (!foundAny) newDecl->setAttrs(AttrVec()); 1549 1550 for (specific_attr_iterator<InheritableAttr> 1551 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1552 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1553 // Ignore deprecated/unavailable/availability attributes if requested. 1554 if (!mergeDeprecation && 1555 (isa<DeprecatedAttr>(*i) || 1556 isa<UnavailableAttr>(*i) || 1557 isa<AvailabilityAttr>(*i))) 1558 continue; 1559 1560 if (!DeclHasAttr(newDecl, *i)) { 1561 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1562 newAttr->setInherited(true); 1563 newDecl->addAttr(newAttr); 1564 foundAny = true; 1565 } 1566 } 1567 1568 if (!foundAny) newDecl->dropAttrs(); 1569} 1570 1571/// mergeParamDeclAttributes - Copy attributes from the old parameter 1572/// to the new one. 1573static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1574 const ParmVarDecl *oldDecl, 1575 ASTContext &C) { 1576 if (!oldDecl->hasAttrs()) 1577 return; 1578 1579 bool foundAny = newDecl->hasAttrs(); 1580 1581 // Ensure that any moving of objects within the allocated map is 1582 // done before we process them. 1583 if (!foundAny) newDecl->setAttrs(AttrVec()); 1584 1585 for (specific_attr_iterator<InheritableParamAttr> 1586 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1587 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1588 if (!DeclHasAttr(newDecl, *i)) { 1589 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1590 newAttr->setInherited(true); 1591 newDecl->addAttr(newAttr); 1592 foundAny = true; 1593 } 1594 } 1595 1596 if (!foundAny) newDecl->dropAttrs(); 1597} 1598 1599namespace { 1600 1601/// Used in MergeFunctionDecl to keep track of function parameters in 1602/// C. 1603struct GNUCompatibleParamWarning { 1604 ParmVarDecl *OldParm; 1605 ParmVarDecl *NewParm; 1606 QualType PromotedType; 1607}; 1608 1609} 1610 1611/// getSpecialMember - get the special member enum for a method. 1612Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1613 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1614 if (Ctor->isDefaultConstructor()) 1615 return Sema::CXXDefaultConstructor; 1616 1617 if (Ctor->isCopyConstructor()) 1618 return Sema::CXXCopyConstructor; 1619 1620 if (Ctor->isMoveConstructor()) 1621 return Sema::CXXMoveConstructor; 1622 } else if (isa<CXXDestructorDecl>(MD)) { 1623 return Sema::CXXDestructor; 1624 } else if (MD->isCopyAssignmentOperator()) { 1625 return Sema::CXXCopyAssignment; 1626 } else if (MD->isMoveAssignmentOperator()) { 1627 return Sema::CXXMoveAssignment; 1628 } 1629 1630 return Sema::CXXInvalid; 1631} 1632 1633/// canRedefineFunction - checks if a function can be redefined. Currently, 1634/// only extern inline functions can be redefined, and even then only in 1635/// GNU89 mode. 1636static bool canRedefineFunction(const FunctionDecl *FD, 1637 const LangOptions& LangOpts) { 1638 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1639 !LangOpts.CPlusPlus && 1640 FD->isInlineSpecified() && 1641 FD->getStorageClass() == SC_Extern); 1642} 1643 1644/// MergeFunctionDecl - We just parsed a function 'New' from 1645/// declarator D which has the same name and scope as a previous 1646/// declaration 'Old'. Figure out how to resolve this situation, 1647/// merging decls or emitting diagnostics as appropriate. 1648/// 1649/// In C++, New and Old must be declarations that are not 1650/// overloaded. Use IsOverload to determine whether New and Old are 1651/// overloaded, and to select the Old declaration that New should be 1652/// merged with. 1653/// 1654/// Returns true if there was an error, false otherwise. 1655bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1656 // Verify the old decl was also a function. 1657 FunctionDecl *Old = 0; 1658 if (FunctionTemplateDecl *OldFunctionTemplate 1659 = dyn_cast<FunctionTemplateDecl>(OldD)) 1660 Old = OldFunctionTemplate->getTemplatedDecl(); 1661 else 1662 Old = dyn_cast<FunctionDecl>(OldD); 1663 if (!Old) { 1664 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1665 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1666 Diag(Shadow->getTargetDecl()->getLocation(), 1667 diag::note_using_decl_target); 1668 Diag(Shadow->getUsingDecl()->getLocation(), 1669 diag::note_using_decl) << 0; 1670 return true; 1671 } 1672 1673 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1674 << New->getDeclName(); 1675 Diag(OldD->getLocation(), diag::note_previous_definition); 1676 return true; 1677 } 1678 1679 // Determine whether the previous declaration was a definition, 1680 // implicit declaration, or a declaration. 1681 diag::kind PrevDiag; 1682 if (Old->isThisDeclarationADefinition()) 1683 PrevDiag = diag::note_previous_definition; 1684 else if (Old->isImplicit()) 1685 PrevDiag = diag::note_previous_implicit_declaration; 1686 else 1687 PrevDiag = diag::note_previous_declaration; 1688 1689 QualType OldQType = Context.getCanonicalType(Old->getType()); 1690 QualType NewQType = Context.getCanonicalType(New->getType()); 1691 1692 // Don't complain about this if we're in GNU89 mode and the old function 1693 // is an extern inline function. 1694 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1695 New->getStorageClass() == SC_Static && 1696 Old->getStorageClass() != SC_Static && 1697 !canRedefineFunction(Old, getLangOptions())) { 1698 if (getLangOptions().MicrosoftExt) { 1699 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1700 Diag(Old->getLocation(), PrevDiag); 1701 } else { 1702 Diag(New->getLocation(), diag::err_static_non_static) << New; 1703 Diag(Old->getLocation(), PrevDiag); 1704 return true; 1705 } 1706 } 1707 1708 // If a function is first declared with a calling convention, but is 1709 // later declared or defined without one, the second decl assumes the 1710 // calling convention of the first. 1711 // 1712 // For the new decl, we have to look at the NON-canonical type to tell the 1713 // difference between a function that really doesn't have a calling 1714 // convention and one that is declared cdecl. That's because in 1715 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1716 // because it is the default calling convention. 1717 // 1718 // Note also that we DO NOT return at this point, because we still have 1719 // other tests to run. 1720 const FunctionType *OldType = cast<FunctionType>(OldQType); 1721 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1722 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1723 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1724 bool RequiresAdjustment = false; 1725 if (OldTypeInfo.getCC() != CC_Default && 1726 NewTypeInfo.getCC() == CC_Default) { 1727 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1728 RequiresAdjustment = true; 1729 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1730 NewTypeInfo.getCC())) { 1731 // Calling conventions really aren't compatible, so complain. 1732 Diag(New->getLocation(), diag::err_cconv_change) 1733 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1734 << (OldTypeInfo.getCC() == CC_Default) 1735 << (OldTypeInfo.getCC() == CC_Default ? "" : 1736 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1737 Diag(Old->getLocation(), diag::note_previous_declaration); 1738 return true; 1739 } 1740 1741 // FIXME: diagnose the other way around? 1742 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1743 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1744 RequiresAdjustment = true; 1745 } 1746 1747 // Merge regparm attribute. 1748 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1749 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1750 if (NewTypeInfo.getHasRegParm()) { 1751 Diag(New->getLocation(), diag::err_regparm_mismatch) 1752 << NewType->getRegParmType() 1753 << OldType->getRegParmType(); 1754 Diag(Old->getLocation(), diag::note_previous_declaration); 1755 return true; 1756 } 1757 1758 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1759 RequiresAdjustment = true; 1760 } 1761 1762 // Merge ns_returns_retained attribute. 1763 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1764 if (NewTypeInfo.getProducesResult()) { 1765 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1766 Diag(Old->getLocation(), diag::note_previous_declaration); 1767 return true; 1768 } 1769 1770 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1771 RequiresAdjustment = true; 1772 } 1773 1774 if (RequiresAdjustment) { 1775 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1776 New->setType(QualType(NewType, 0)); 1777 NewQType = Context.getCanonicalType(New->getType()); 1778 } 1779 1780 if (getLangOptions().CPlusPlus) { 1781 // (C++98 13.1p2): 1782 // Certain function declarations cannot be overloaded: 1783 // -- Function declarations that differ only in the return type 1784 // cannot be overloaded. 1785 QualType OldReturnType = OldType->getResultType(); 1786 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1787 QualType ResQT; 1788 if (OldReturnType != NewReturnType) { 1789 if (NewReturnType->isObjCObjectPointerType() 1790 && OldReturnType->isObjCObjectPointerType()) 1791 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1792 if (ResQT.isNull()) { 1793 if (New->isCXXClassMember() && New->isOutOfLine()) 1794 Diag(New->getLocation(), 1795 diag::err_member_def_does_not_match_ret_type) << New; 1796 else 1797 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1798 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1799 return true; 1800 } 1801 else 1802 NewQType = ResQT; 1803 } 1804 1805 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1806 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1807 if (OldMethod && NewMethod) { 1808 // Preserve triviality. 1809 NewMethod->setTrivial(OldMethod->isTrivial()); 1810 1811 // MSVC allows explicit template specialization at class scope: 1812 // 2 CXMethodDecls referring to the same function will be injected. 1813 // We don't want a redeclartion error. 1814 bool IsClassScopeExplicitSpecialization = 1815 OldMethod->isFunctionTemplateSpecialization() && 1816 NewMethod->isFunctionTemplateSpecialization(); 1817 bool isFriend = NewMethod->getFriendObjectKind(); 1818 1819 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1820 !IsClassScopeExplicitSpecialization) { 1821 // -- Member function declarations with the same name and the 1822 // same parameter types cannot be overloaded if any of them 1823 // is a static member function declaration. 1824 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1825 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1826 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1827 return true; 1828 } 1829 1830 // C++ [class.mem]p1: 1831 // [...] A member shall not be declared twice in the 1832 // member-specification, except that a nested class or member 1833 // class template can be declared and then later defined. 1834 unsigned NewDiag; 1835 if (isa<CXXConstructorDecl>(OldMethod)) 1836 NewDiag = diag::err_constructor_redeclared; 1837 else if (isa<CXXDestructorDecl>(NewMethod)) 1838 NewDiag = diag::err_destructor_redeclared; 1839 else if (isa<CXXConversionDecl>(NewMethod)) 1840 NewDiag = diag::err_conv_function_redeclared; 1841 else 1842 NewDiag = diag::err_member_redeclared; 1843 1844 Diag(New->getLocation(), NewDiag); 1845 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1846 1847 // Complain if this is an explicit declaration of a special 1848 // member that was initially declared implicitly. 1849 // 1850 // As an exception, it's okay to befriend such methods in order 1851 // to permit the implicit constructor/destructor/operator calls. 1852 } else if (OldMethod->isImplicit()) { 1853 if (isFriend) { 1854 NewMethod->setImplicit(); 1855 } else { 1856 Diag(NewMethod->getLocation(), 1857 diag::err_definition_of_implicitly_declared_member) 1858 << New << getSpecialMember(OldMethod); 1859 return true; 1860 } 1861 } else if (OldMethod->isExplicitlyDefaulted()) { 1862 Diag(NewMethod->getLocation(), 1863 diag::err_definition_of_explicitly_defaulted_member) 1864 << getSpecialMember(OldMethod); 1865 return true; 1866 } 1867 } 1868 1869 // (C++98 8.3.5p3): 1870 // All declarations for a function shall agree exactly in both the 1871 // return type and the parameter-type-list. 1872 // We also want to respect all the extended bits except noreturn. 1873 1874 // noreturn should now match unless the old type info didn't have it. 1875 QualType OldQTypeForComparison = OldQType; 1876 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1877 assert(OldQType == QualType(OldType, 0)); 1878 const FunctionType *OldTypeForComparison 1879 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1880 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1881 assert(OldQTypeForComparison.isCanonical()); 1882 } 1883 1884 if (OldQTypeForComparison == NewQType) 1885 return MergeCompatibleFunctionDecls(New, Old); 1886 1887 // Fall through for conflicting redeclarations and redefinitions. 1888 } 1889 1890 // C: Function types need to be compatible, not identical. This handles 1891 // duplicate function decls like "void f(int); void f(enum X);" properly. 1892 if (!getLangOptions().CPlusPlus && 1893 Context.typesAreCompatible(OldQType, NewQType)) { 1894 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1895 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1896 const FunctionProtoType *OldProto = 0; 1897 if (isa<FunctionNoProtoType>(NewFuncType) && 1898 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1899 // The old declaration provided a function prototype, but the 1900 // new declaration does not. Merge in the prototype. 1901 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1902 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1903 OldProto->arg_type_end()); 1904 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1905 ParamTypes.data(), ParamTypes.size(), 1906 OldProto->getExtProtoInfo()); 1907 New->setType(NewQType); 1908 New->setHasInheritedPrototype(); 1909 1910 // Synthesize a parameter for each argument type. 1911 SmallVector<ParmVarDecl*, 16> Params; 1912 for (FunctionProtoType::arg_type_iterator 1913 ParamType = OldProto->arg_type_begin(), 1914 ParamEnd = OldProto->arg_type_end(); 1915 ParamType != ParamEnd; ++ParamType) { 1916 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1917 SourceLocation(), 1918 SourceLocation(), 0, 1919 *ParamType, /*TInfo=*/0, 1920 SC_None, SC_None, 1921 0); 1922 Param->setScopeInfo(0, Params.size()); 1923 Param->setImplicit(); 1924 Params.push_back(Param); 1925 } 1926 1927 New->setParams(Params); 1928 } 1929 1930 return MergeCompatibleFunctionDecls(New, Old); 1931 } 1932 1933 // GNU C permits a K&R definition to follow a prototype declaration 1934 // if the declared types of the parameters in the K&R definition 1935 // match the types in the prototype declaration, even when the 1936 // promoted types of the parameters from the K&R definition differ 1937 // from the types in the prototype. GCC then keeps the types from 1938 // the prototype. 1939 // 1940 // If a variadic prototype is followed by a non-variadic K&R definition, 1941 // the K&R definition becomes variadic. This is sort of an edge case, but 1942 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1943 // C99 6.9.1p8. 1944 if (!getLangOptions().CPlusPlus && 1945 Old->hasPrototype() && !New->hasPrototype() && 1946 New->getType()->getAs<FunctionProtoType>() && 1947 Old->getNumParams() == New->getNumParams()) { 1948 SmallVector<QualType, 16> ArgTypes; 1949 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1950 const FunctionProtoType *OldProto 1951 = Old->getType()->getAs<FunctionProtoType>(); 1952 const FunctionProtoType *NewProto 1953 = New->getType()->getAs<FunctionProtoType>(); 1954 1955 // Determine whether this is the GNU C extension. 1956 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1957 NewProto->getResultType()); 1958 bool LooseCompatible = !MergedReturn.isNull(); 1959 for (unsigned Idx = 0, End = Old->getNumParams(); 1960 LooseCompatible && Idx != End; ++Idx) { 1961 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1962 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1963 if (Context.typesAreCompatible(OldParm->getType(), 1964 NewProto->getArgType(Idx))) { 1965 ArgTypes.push_back(NewParm->getType()); 1966 } else if (Context.typesAreCompatible(OldParm->getType(), 1967 NewParm->getType(), 1968 /*CompareUnqualified=*/true)) { 1969 GNUCompatibleParamWarning Warn 1970 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1971 Warnings.push_back(Warn); 1972 ArgTypes.push_back(NewParm->getType()); 1973 } else 1974 LooseCompatible = false; 1975 } 1976 1977 if (LooseCompatible) { 1978 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1979 Diag(Warnings[Warn].NewParm->getLocation(), 1980 diag::ext_param_promoted_not_compatible_with_prototype) 1981 << Warnings[Warn].PromotedType 1982 << Warnings[Warn].OldParm->getType(); 1983 if (Warnings[Warn].OldParm->getLocation().isValid()) 1984 Diag(Warnings[Warn].OldParm->getLocation(), 1985 diag::note_previous_declaration); 1986 } 1987 1988 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1989 ArgTypes.size(), 1990 OldProto->getExtProtoInfo())); 1991 return MergeCompatibleFunctionDecls(New, Old); 1992 } 1993 1994 // Fall through to diagnose conflicting types. 1995 } 1996 1997 // A function that has already been declared has been redeclared or defined 1998 // with a different type- show appropriate diagnostic 1999 if (unsigned BuiltinID = Old->getBuiltinID()) { 2000 // The user has declared a builtin function with an incompatible 2001 // signature. 2002 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2003 // The function the user is redeclaring is a library-defined 2004 // function like 'malloc' or 'printf'. Warn about the 2005 // redeclaration, then pretend that we don't know about this 2006 // library built-in. 2007 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2008 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2009 << Old << Old->getType(); 2010 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2011 Old->setInvalidDecl(); 2012 return false; 2013 } 2014 2015 PrevDiag = diag::note_previous_builtin_declaration; 2016 } 2017 2018 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2019 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2020 return true; 2021} 2022 2023/// \brief Completes the merge of two function declarations that are 2024/// known to be compatible. 2025/// 2026/// This routine handles the merging of attributes and other 2027/// properties of function declarations form the old declaration to 2028/// the new declaration, once we know that New is in fact a 2029/// redeclaration of Old. 2030/// 2031/// \returns false 2032bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2033 // Merge the attributes 2034 mergeDeclAttributes(New, Old, Context); 2035 2036 // Merge the storage class. 2037 if (Old->getStorageClass() != SC_Extern && 2038 Old->getStorageClass() != SC_None) 2039 New->setStorageClass(Old->getStorageClass()); 2040 2041 // Merge "pure" flag. 2042 if (Old->isPure()) 2043 New->setPure(); 2044 2045 // __module_private__ is propagated to later declarations. 2046 if (Old->isModulePrivate()) 2047 New->setModulePrivate(); 2048 else if (New->isModulePrivate()) 2049 diagnoseModulePrivateRedeclaration(New, Old); 2050 2051 // Merge attributes from the parameters. These can mismatch with K&R 2052 // declarations. 2053 if (New->getNumParams() == Old->getNumParams()) 2054 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2055 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2056 Context); 2057 2058 if (getLangOptions().CPlusPlus) 2059 return MergeCXXFunctionDecl(New, Old); 2060 2061 return false; 2062} 2063 2064 2065void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2066 const ObjCMethodDecl *oldMethod) { 2067 // We don't want to merge unavailable and deprecated attributes 2068 // except from interface to implementation. 2069 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2070 2071 // Merge the attributes. 2072 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2073 2074 // Merge attributes from the parameters. 2075 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2076 for (ObjCMethodDecl::param_iterator 2077 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2078 ni != ne; ++ni, ++oi) 2079 mergeParamDeclAttributes(*ni, *oi, Context); 2080 2081 CheckObjCMethodOverride(newMethod, oldMethod, true); 2082} 2083 2084/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2085/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2086/// emitting diagnostics as appropriate. 2087/// 2088/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2089/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2090/// check them before the initializer is attached. 2091/// 2092void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2093 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2094 return; 2095 2096 QualType MergedT; 2097 if (getLangOptions().CPlusPlus) { 2098 AutoType *AT = New->getType()->getContainedAutoType(); 2099 if (AT && !AT->isDeduced()) { 2100 // We don't know what the new type is until the initializer is attached. 2101 return; 2102 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2103 // These could still be something that needs exception specs checked. 2104 return MergeVarDeclExceptionSpecs(New, Old); 2105 } 2106 // C++ [basic.link]p10: 2107 // [...] the types specified by all declarations referring to a given 2108 // object or function shall be identical, except that declarations for an 2109 // array object can specify array types that differ by the presence or 2110 // absence of a major array bound (8.3.4). 2111 else if (Old->getType()->isIncompleteArrayType() && 2112 New->getType()->isArrayType()) { 2113 CanQual<ArrayType> OldArray 2114 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2115 CanQual<ArrayType> NewArray 2116 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2117 if (OldArray->getElementType() == NewArray->getElementType()) 2118 MergedT = New->getType(); 2119 } else if (Old->getType()->isArrayType() && 2120 New->getType()->isIncompleteArrayType()) { 2121 CanQual<ArrayType> OldArray 2122 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2123 CanQual<ArrayType> NewArray 2124 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2125 if (OldArray->getElementType() == NewArray->getElementType()) 2126 MergedT = Old->getType(); 2127 } else if (New->getType()->isObjCObjectPointerType() 2128 && Old->getType()->isObjCObjectPointerType()) { 2129 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2130 Old->getType()); 2131 } 2132 } else { 2133 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2134 } 2135 if (MergedT.isNull()) { 2136 Diag(New->getLocation(), diag::err_redefinition_different_type) 2137 << New->getDeclName(); 2138 Diag(Old->getLocation(), diag::note_previous_definition); 2139 return New->setInvalidDecl(); 2140 } 2141 New->setType(MergedT); 2142} 2143 2144/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2145/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2146/// situation, merging decls or emitting diagnostics as appropriate. 2147/// 2148/// Tentative definition rules (C99 6.9.2p2) are checked by 2149/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2150/// definitions here, since the initializer hasn't been attached. 2151/// 2152void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2153 // If the new decl is already invalid, don't do any other checking. 2154 if (New->isInvalidDecl()) 2155 return; 2156 2157 // Verify the old decl was also a variable. 2158 VarDecl *Old = 0; 2159 if (!Previous.isSingleResult() || 2160 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2161 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2162 << New->getDeclName(); 2163 Diag(Previous.getRepresentativeDecl()->getLocation(), 2164 diag::note_previous_definition); 2165 return New->setInvalidDecl(); 2166 } 2167 2168 // C++ [class.mem]p1: 2169 // A member shall not be declared twice in the member-specification [...] 2170 // 2171 // Here, we need only consider static data members. 2172 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2173 Diag(New->getLocation(), diag::err_duplicate_member) 2174 << New->getIdentifier(); 2175 Diag(Old->getLocation(), diag::note_previous_declaration); 2176 New->setInvalidDecl(); 2177 } 2178 2179 mergeDeclAttributes(New, Old, Context); 2180 // Warn if an already-declared variable is made a weak_import in a subsequent 2181 // declaration 2182 if (New->getAttr<WeakImportAttr>() && 2183 Old->getStorageClass() == SC_None && 2184 !Old->getAttr<WeakImportAttr>()) { 2185 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2186 Diag(Old->getLocation(), diag::note_previous_definition); 2187 // Remove weak_import attribute on new declaration. 2188 New->dropAttr<WeakImportAttr>(); 2189 } 2190 2191 // Merge the types. 2192 MergeVarDeclTypes(New, Old); 2193 if (New->isInvalidDecl()) 2194 return; 2195 2196 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2197 if (New->getStorageClass() == SC_Static && 2198 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2199 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2200 Diag(Old->getLocation(), diag::note_previous_definition); 2201 return New->setInvalidDecl(); 2202 } 2203 // C99 6.2.2p4: 2204 // For an identifier declared with the storage-class specifier 2205 // extern in a scope in which a prior declaration of that 2206 // identifier is visible,23) if the prior declaration specifies 2207 // internal or external linkage, the linkage of the identifier at 2208 // the later declaration is the same as the linkage specified at 2209 // the prior declaration. If no prior declaration is visible, or 2210 // if the prior declaration specifies no linkage, then the 2211 // identifier has external linkage. 2212 if (New->hasExternalStorage() && Old->hasLinkage()) 2213 /* Okay */; 2214 else if (New->getStorageClass() != SC_Static && 2215 Old->getStorageClass() == SC_Static) { 2216 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2217 Diag(Old->getLocation(), diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 2221 // Check if extern is followed by non-extern and vice-versa. 2222 if (New->hasExternalStorage() && 2223 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2224 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2225 Diag(Old->getLocation(), diag::note_previous_definition); 2226 return New->setInvalidDecl(); 2227 } 2228 if (Old->hasExternalStorage() && 2229 !New->hasLinkage() && New->isLocalVarDecl()) { 2230 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2231 Diag(Old->getLocation(), diag::note_previous_definition); 2232 return New->setInvalidDecl(); 2233 } 2234 2235 // __module_private__ is propagated to later declarations. 2236 if (Old->isModulePrivate()) 2237 New->setModulePrivate(); 2238 else if (New->isModulePrivate()) 2239 diagnoseModulePrivateRedeclaration(New, Old); 2240 2241 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2242 2243 // FIXME: The test for external storage here seems wrong? We still 2244 // need to check for mismatches. 2245 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2246 // Don't complain about out-of-line definitions of static members. 2247 !(Old->getLexicalDeclContext()->isRecord() && 2248 !New->getLexicalDeclContext()->isRecord())) { 2249 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2250 Diag(Old->getLocation(), diag::note_previous_definition); 2251 return New->setInvalidDecl(); 2252 } 2253 2254 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2255 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2256 Diag(Old->getLocation(), diag::note_previous_definition); 2257 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2258 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2259 Diag(Old->getLocation(), diag::note_previous_definition); 2260 } 2261 2262 // C++ doesn't have tentative definitions, so go right ahead and check here. 2263 const VarDecl *Def; 2264 if (getLangOptions().CPlusPlus && 2265 New->isThisDeclarationADefinition() == VarDecl::Definition && 2266 (Def = Old->getDefinition())) { 2267 Diag(New->getLocation(), diag::err_redefinition) 2268 << New->getDeclName(); 2269 Diag(Def->getLocation(), diag::note_previous_definition); 2270 New->setInvalidDecl(); 2271 return; 2272 } 2273 // c99 6.2.2 P4. 2274 // For an identifier declared with the storage-class specifier extern in a 2275 // scope in which a prior declaration of that identifier is visible, if 2276 // the prior declaration specifies internal or external linkage, the linkage 2277 // of the identifier at the later declaration is the same as the linkage 2278 // specified at the prior declaration. 2279 // FIXME. revisit this code. 2280 if (New->hasExternalStorage() && 2281 Old->getLinkage() == InternalLinkage && 2282 New->getDeclContext() == Old->getDeclContext()) 2283 New->setStorageClass(Old->getStorageClass()); 2284 2285 // Keep a chain of previous declarations. 2286 New->setPreviousDeclaration(Old); 2287 2288 // Inherit access appropriately. 2289 New->setAccess(Old->getAccess()); 2290} 2291 2292/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2293/// no declarator (e.g. "struct foo;") is parsed. 2294Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2295 DeclSpec &DS) { 2296 return ParsedFreeStandingDeclSpec(S, AS, DS, 2297 MultiTemplateParamsArg(*this, 0, 0)); 2298} 2299 2300/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2301/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2302/// parameters to cope with template friend declarations. 2303Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2304 DeclSpec &DS, 2305 MultiTemplateParamsArg TemplateParams) { 2306 Decl *TagD = 0; 2307 TagDecl *Tag = 0; 2308 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2309 DS.getTypeSpecType() == DeclSpec::TST_struct || 2310 DS.getTypeSpecType() == DeclSpec::TST_union || 2311 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2312 TagD = DS.getRepAsDecl(); 2313 2314 if (!TagD) // We probably had an error 2315 return 0; 2316 2317 // Note that the above type specs guarantee that the 2318 // type rep is a Decl, whereas in many of the others 2319 // it's a Type. 2320 if (isa<TagDecl>(TagD)) 2321 Tag = cast<TagDecl>(TagD); 2322 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2323 Tag = CTD->getTemplatedDecl(); 2324 } 2325 2326 if (Tag) 2327 Tag->setFreeStanding(); 2328 2329 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2330 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2331 // or incomplete types shall not be restrict-qualified." 2332 if (TypeQuals & DeclSpec::TQ_restrict) 2333 Diag(DS.getRestrictSpecLoc(), 2334 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2335 << DS.getSourceRange(); 2336 } 2337 2338 if (DS.isConstexprSpecified()) { 2339 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2340 // and definitions of functions and variables. 2341 if (Tag) 2342 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2343 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2344 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2345 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2346 else 2347 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2348 // Don't emit warnings after this error. 2349 return TagD; 2350 } 2351 2352 if (DS.isFriendSpecified()) { 2353 // If we're dealing with a decl but not a TagDecl, assume that 2354 // whatever routines created it handled the friendship aspect. 2355 if (TagD && !Tag) 2356 return 0; 2357 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2358 } 2359 2360 // Track whether we warned about the fact that there aren't any 2361 // declarators. 2362 bool emittedWarning = false; 2363 2364 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2365 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2366 2367 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2368 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2369 if (getLangOptions().CPlusPlus || 2370 Record->getDeclContext()->isRecord()) 2371 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2372 2373 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2374 << DS.getSourceRange(); 2375 emittedWarning = true; 2376 } 2377 } 2378 2379 // Check for Microsoft C extension: anonymous struct. 2380 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2381 CurContext->isRecord() && 2382 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2383 // Handle 2 kinds of anonymous struct: 2384 // struct STRUCT; 2385 // and 2386 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2387 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2388 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2389 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2390 DS.getRepAsType().get()->isStructureType())) { 2391 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2392 << DS.getSourceRange(); 2393 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2394 } 2395 } 2396 2397 if (getLangOptions().CPlusPlus && 2398 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2399 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2400 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2401 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2402 Diag(Enum->getLocation(), diag::ext_no_declarators) 2403 << DS.getSourceRange(); 2404 emittedWarning = true; 2405 } 2406 2407 // Skip all the checks below if we have a type error. 2408 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2409 2410 if (!DS.isMissingDeclaratorOk()) { 2411 // Warn about typedefs of enums without names, since this is an 2412 // extension in both Microsoft and GNU. 2413 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2414 Tag && isa<EnumDecl>(Tag)) { 2415 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2416 << DS.getSourceRange(); 2417 return Tag; 2418 } 2419 2420 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2421 << DS.getSourceRange(); 2422 emittedWarning = true; 2423 } 2424 2425 // We're going to complain about a bunch of spurious specifiers; 2426 // only do this if we're declaring a tag, because otherwise we 2427 // should be getting diag::ext_no_declarators. 2428 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2429 return TagD; 2430 2431 // Note that a linkage-specification sets a storage class, but 2432 // 'extern "C" struct foo;' is actually valid and not theoretically 2433 // useless. 2434 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2435 if (!DS.isExternInLinkageSpec()) 2436 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2437 << DeclSpec::getSpecifierName(scs); 2438 2439 if (DS.isThreadSpecified()) 2440 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2441 if (DS.getTypeQualifiers()) { 2442 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2443 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2444 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2445 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2446 // Restrict is covered above. 2447 } 2448 if (DS.isInlineSpecified()) 2449 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2450 if (DS.isVirtualSpecified()) 2451 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2452 if (DS.isExplicitSpecified()) 2453 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2454 2455 if (DS.isModulePrivateSpecified() && 2456 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2457 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2458 << Tag->getTagKind() 2459 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2460 2461 // FIXME: Warn on useless attributes 2462 2463 return TagD; 2464} 2465 2466/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2467/// builds a statement for it and returns it so it is evaluated. 2468StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2469 StmtResult R; 2470 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2471 Expr *Exp = DS.getRepAsExpr(); 2472 QualType Ty = Exp->getType(); 2473 if (Ty->isPointerType()) { 2474 do 2475 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2476 while (Ty->isPointerType()); 2477 } 2478 if (Ty->isVariableArrayType()) { 2479 R = ActOnExprStmt(MakeFullExpr(Exp)); 2480 } 2481 } 2482 return R; 2483} 2484 2485/// We are trying to inject an anonymous member into the given scope; 2486/// check if there's an existing declaration that can't be overloaded. 2487/// 2488/// \return true if this is a forbidden redeclaration 2489static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2490 Scope *S, 2491 DeclContext *Owner, 2492 DeclarationName Name, 2493 SourceLocation NameLoc, 2494 unsigned diagnostic) { 2495 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2496 Sema::ForRedeclaration); 2497 if (!SemaRef.LookupName(R, S)) return false; 2498 2499 if (R.getAsSingle<TagDecl>()) 2500 return false; 2501 2502 // Pick a representative declaration. 2503 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2504 assert(PrevDecl && "Expected a non-null Decl"); 2505 2506 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2507 return false; 2508 2509 SemaRef.Diag(NameLoc, diagnostic) << Name; 2510 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2511 2512 return true; 2513} 2514 2515/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2516/// anonymous struct or union AnonRecord into the owning context Owner 2517/// and scope S. This routine will be invoked just after we realize 2518/// that an unnamed union or struct is actually an anonymous union or 2519/// struct, e.g., 2520/// 2521/// @code 2522/// union { 2523/// int i; 2524/// float f; 2525/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2526/// // f into the surrounding scope.x 2527/// @endcode 2528/// 2529/// This routine is recursive, injecting the names of nested anonymous 2530/// structs/unions into the owning context and scope as well. 2531static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2532 DeclContext *Owner, 2533 RecordDecl *AnonRecord, 2534 AccessSpecifier AS, 2535 SmallVector<NamedDecl*, 2> &Chaining, 2536 bool MSAnonStruct) { 2537 unsigned diagKind 2538 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2539 : diag::err_anonymous_struct_member_redecl; 2540 2541 bool Invalid = false; 2542 2543 // Look every FieldDecl and IndirectFieldDecl with a name. 2544 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2545 DEnd = AnonRecord->decls_end(); 2546 D != DEnd; ++D) { 2547 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2548 cast<NamedDecl>(*D)->getDeclName()) { 2549 ValueDecl *VD = cast<ValueDecl>(*D); 2550 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2551 VD->getLocation(), diagKind)) { 2552 // C++ [class.union]p2: 2553 // The names of the members of an anonymous union shall be 2554 // distinct from the names of any other entity in the 2555 // scope in which the anonymous union is declared. 2556 Invalid = true; 2557 } else { 2558 // C++ [class.union]p2: 2559 // For the purpose of name lookup, after the anonymous union 2560 // definition, the members of the anonymous union are 2561 // considered to have been defined in the scope in which the 2562 // anonymous union is declared. 2563 unsigned OldChainingSize = Chaining.size(); 2564 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2565 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2566 PE = IF->chain_end(); PI != PE; ++PI) 2567 Chaining.push_back(*PI); 2568 else 2569 Chaining.push_back(VD); 2570 2571 assert(Chaining.size() >= 2); 2572 NamedDecl **NamedChain = 2573 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2574 for (unsigned i = 0; i < Chaining.size(); i++) 2575 NamedChain[i] = Chaining[i]; 2576 2577 IndirectFieldDecl* IndirectField = 2578 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2579 VD->getIdentifier(), VD->getType(), 2580 NamedChain, Chaining.size()); 2581 2582 IndirectField->setAccess(AS); 2583 IndirectField->setImplicit(); 2584 SemaRef.PushOnScopeChains(IndirectField, S); 2585 2586 // That includes picking up the appropriate access specifier. 2587 if (AS != AS_none) IndirectField->setAccess(AS); 2588 2589 Chaining.resize(OldChainingSize); 2590 } 2591 } 2592 } 2593 2594 return Invalid; 2595} 2596 2597/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2598/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2599/// illegal input values are mapped to SC_None. 2600static StorageClass 2601StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2602 switch (StorageClassSpec) { 2603 case DeclSpec::SCS_unspecified: return SC_None; 2604 case DeclSpec::SCS_extern: return SC_Extern; 2605 case DeclSpec::SCS_static: return SC_Static; 2606 case DeclSpec::SCS_auto: return SC_Auto; 2607 case DeclSpec::SCS_register: return SC_Register; 2608 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2609 // Illegal SCSs map to None: error reporting is up to the caller. 2610 case DeclSpec::SCS_mutable: // Fall through. 2611 case DeclSpec::SCS_typedef: return SC_None; 2612 } 2613 llvm_unreachable("unknown storage class specifier"); 2614} 2615 2616/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2617/// a StorageClass. Any error reporting is up to the caller: 2618/// illegal input values are mapped to SC_None. 2619static StorageClass 2620StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2621 switch (StorageClassSpec) { 2622 case DeclSpec::SCS_unspecified: return SC_None; 2623 case DeclSpec::SCS_extern: return SC_Extern; 2624 case DeclSpec::SCS_static: return SC_Static; 2625 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2626 // Illegal SCSs map to None: error reporting is up to the caller. 2627 case DeclSpec::SCS_auto: // Fall through. 2628 case DeclSpec::SCS_mutable: // Fall through. 2629 case DeclSpec::SCS_register: // Fall through. 2630 case DeclSpec::SCS_typedef: return SC_None; 2631 } 2632 llvm_unreachable("unknown storage class specifier"); 2633} 2634 2635/// BuildAnonymousStructOrUnion - Handle the declaration of an 2636/// anonymous structure or union. Anonymous unions are a C++ feature 2637/// (C++ [class.union]) and a GNU C extension; anonymous structures 2638/// are a GNU C and GNU C++ extension. 2639Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2640 AccessSpecifier AS, 2641 RecordDecl *Record) { 2642 DeclContext *Owner = Record->getDeclContext(); 2643 2644 // Diagnose whether this anonymous struct/union is an extension. 2645 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2646 Diag(Record->getLocation(), diag::ext_anonymous_union); 2647 else if (!Record->isUnion()) 2648 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2649 2650 // C and C++ require different kinds of checks for anonymous 2651 // structs/unions. 2652 bool Invalid = false; 2653 if (getLangOptions().CPlusPlus) { 2654 const char* PrevSpec = 0; 2655 unsigned DiagID; 2656 if (Record->isUnion()) { 2657 // C++ [class.union]p6: 2658 // Anonymous unions declared in a named namespace or in the 2659 // global namespace shall be declared static. 2660 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2661 (isa<TranslationUnitDecl>(Owner) || 2662 (isa<NamespaceDecl>(Owner) && 2663 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2664 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2665 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2666 2667 // Recover by adding 'static'. 2668 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2669 PrevSpec, DiagID); 2670 } 2671 // C++ [class.union]p6: 2672 // A storage class is not allowed in a declaration of an 2673 // anonymous union in a class scope. 2674 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2675 isa<RecordDecl>(Owner)) { 2676 Diag(DS.getStorageClassSpecLoc(), 2677 diag::err_anonymous_union_with_storage_spec) 2678 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2679 2680 // Recover by removing the storage specifier. 2681 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2682 SourceLocation(), 2683 PrevSpec, DiagID); 2684 } 2685 } 2686 2687 // Ignore const/volatile/restrict qualifiers. 2688 if (DS.getTypeQualifiers()) { 2689 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2690 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2691 << Record->isUnion() << 0 2692 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2693 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2694 Diag(DS.getVolatileSpecLoc(), 2695 diag::ext_anonymous_struct_union_qualified) 2696 << Record->isUnion() << 1 2697 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2698 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2699 Diag(DS.getRestrictSpecLoc(), 2700 diag::ext_anonymous_struct_union_qualified) 2701 << Record->isUnion() << 2 2702 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2703 2704 DS.ClearTypeQualifiers(); 2705 } 2706 2707 // C++ [class.union]p2: 2708 // The member-specification of an anonymous union shall only 2709 // define non-static data members. [Note: nested types and 2710 // functions cannot be declared within an anonymous union. ] 2711 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2712 MemEnd = Record->decls_end(); 2713 Mem != MemEnd; ++Mem) { 2714 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2715 // C++ [class.union]p3: 2716 // An anonymous union shall not have private or protected 2717 // members (clause 11). 2718 assert(FD->getAccess() != AS_none); 2719 if (FD->getAccess() != AS_public) { 2720 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2721 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2722 Invalid = true; 2723 } 2724 2725 // C++ [class.union]p1 2726 // An object of a class with a non-trivial constructor, a non-trivial 2727 // copy constructor, a non-trivial destructor, or a non-trivial copy 2728 // assignment operator cannot be a member of a union, nor can an 2729 // array of such objects. 2730 if (CheckNontrivialField(FD)) 2731 Invalid = true; 2732 } else if ((*Mem)->isImplicit()) { 2733 // Any implicit members are fine. 2734 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2735 // This is a type that showed up in an 2736 // elaborated-type-specifier inside the anonymous struct or 2737 // union, but which actually declares a type outside of the 2738 // anonymous struct or union. It's okay. 2739 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2740 if (!MemRecord->isAnonymousStructOrUnion() && 2741 MemRecord->getDeclName()) { 2742 // Visual C++ allows type definition in anonymous struct or union. 2743 if (getLangOptions().MicrosoftExt) 2744 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2745 << (int)Record->isUnion(); 2746 else { 2747 // This is a nested type declaration. 2748 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2749 << (int)Record->isUnion(); 2750 Invalid = true; 2751 } 2752 } 2753 } else if (isa<AccessSpecDecl>(*Mem)) { 2754 // Any access specifier is fine. 2755 } else { 2756 // We have something that isn't a non-static data 2757 // member. Complain about it. 2758 unsigned DK = diag::err_anonymous_record_bad_member; 2759 if (isa<TypeDecl>(*Mem)) 2760 DK = diag::err_anonymous_record_with_type; 2761 else if (isa<FunctionDecl>(*Mem)) 2762 DK = diag::err_anonymous_record_with_function; 2763 else if (isa<VarDecl>(*Mem)) 2764 DK = diag::err_anonymous_record_with_static; 2765 2766 // Visual C++ allows type definition in anonymous struct or union. 2767 if (getLangOptions().MicrosoftExt && 2768 DK == diag::err_anonymous_record_with_type) 2769 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2770 << (int)Record->isUnion(); 2771 else { 2772 Diag((*Mem)->getLocation(), DK) 2773 << (int)Record->isUnion(); 2774 Invalid = true; 2775 } 2776 } 2777 } 2778 } 2779 2780 if (!Record->isUnion() && !Owner->isRecord()) { 2781 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2782 << (int)getLangOptions().CPlusPlus; 2783 Invalid = true; 2784 } 2785 2786 // Mock up a declarator. 2787 Declarator Dc(DS, Declarator::MemberContext); 2788 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2789 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2790 2791 // Create a declaration for this anonymous struct/union. 2792 NamedDecl *Anon = 0; 2793 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2794 Anon = FieldDecl::Create(Context, OwningClass, 2795 DS.getSourceRange().getBegin(), 2796 Record->getLocation(), 2797 /*IdentifierInfo=*/0, 2798 Context.getTypeDeclType(Record), 2799 TInfo, 2800 /*BitWidth=*/0, /*Mutable=*/false, 2801 /*HasInit=*/false); 2802 Anon->setAccess(AS); 2803 if (getLangOptions().CPlusPlus) 2804 FieldCollector->Add(cast<FieldDecl>(Anon)); 2805 } else { 2806 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2807 assert(SCSpec != DeclSpec::SCS_typedef && 2808 "Parser allowed 'typedef' as storage class VarDecl."); 2809 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2810 if (SCSpec == DeclSpec::SCS_mutable) { 2811 // mutable can only appear on non-static class members, so it's always 2812 // an error here 2813 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2814 Invalid = true; 2815 SC = SC_None; 2816 } 2817 SCSpec = DS.getStorageClassSpecAsWritten(); 2818 VarDecl::StorageClass SCAsWritten 2819 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2820 2821 Anon = VarDecl::Create(Context, Owner, 2822 DS.getSourceRange().getBegin(), 2823 Record->getLocation(), /*IdentifierInfo=*/0, 2824 Context.getTypeDeclType(Record), 2825 TInfo, SC, SCAsWritten); 2826 2827 // Default-initialize the implicit variable. This initialization will be 2828 // trivial in almost all cases, except if a union member has an in-class 2829 // initializer: 2830 // union { int n = 0; }; 2831 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2832 } 2833 Anon->setImplicit(); 2834 2835 // Add the anonymous struct/union object to the current 2836 // context. We'll be referencing this object when we refer to one of 2837 // its members. 2838 Owner->addDecl(Anon); 2839 2840 // Inject the members of the anonymous struct/union into the owning 2841 // context and into the identifier resolver chain for name lookup 2842 // purposes. 2843 SmallVector<NamedDecl*, 2> Chain; 2844 Chain.push_back(Anon); 2845 2846 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2847 Chain, false)) 2848 Invalid = true; 2849 2850 // Mark this as an anonymous struct/union type. Note that we do not 2851 // do this until after we have already checked and injected the 2852 // members of this anonymous struct/union type, because otherwise 2853 // the members could be injected twice: once by DeclContext when it 2854 // builds its lookup table, and once by 2855 // InjectAnonymousStructOrUnionMembers. 2856 Record->setAnonymousStructOrUnion(true); 2857 2858 if (Invalid) 2859 Anon->setInvalidDecl(); 2860 2861 return Anon; 2862} 2863 2864/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2865/// Microsoft C anonymous structure. 2866/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2867/// Example: 2868/// 2869/// struct A { int a; }; 2870/// struct B { struct A; int b; }; 2871/// 2872/// void foo() { 2873/// B var; 2874/// var.a = 3; 2875/// } 2876/// 2877Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2878 RecordDecl *Record) { 2879 2880 // If there is no Record, get the record via the typedef. 2881 if (!Record) 2882 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2883 2884 // Mock up a declarator. 2885 Declarator Dc(DS, Declarator::TypeNameContext); 2886 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2887 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2888 2889 // Create a declaration for this anonymous struct. 2890 NamedDecl* Anon = FieldDecl::Create(Context, 2891 cast<RecordDecl>(CurContext), 2892 DS.getSourceRange().getBegin(), 2893 DS.getSourceRange().getBegin(), 2894 /*IdentifierInfo=*/0, 2895 Context.getTypeDeclType(Record), 2896 TInfo, 2897 /*BitWidth=*/0, /*Mutable=*/false, 2898 /*HasInit=*/false); 2899 Anon->setImplicit(); 2900 2901 // Add the anonymous struct object to the current context. 2902 CurContext->addDecl(Anon); 2903 2904 // Inject the members of the anonymous struct into the current 2905 // context and into the identifier resolver chain for name lookup 2906 // purposes. 2907 SmallVector<NamedDecl*, 2> Chain; 2908 Chain.push_back(Anon); 2909 2910 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2911 Record->getDefinition(), 2912 AS_none, Chain, true)) 2913 Anon->setInvalidDecl(); 2914 2915 return Anon; 2916} 2917 2918/// GetNameForDeclarator - Determine the full declaration name for the 2919/// given Declarator. 2920DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2921 return GetNameFromUnqualifiedId(D.getName()); 2922} 2923 2924/// \brief Retrieves the declaration name from a parsed unqualified-id. 2925DeclarationNameInfo 2926Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2927 DeclarationNameInfo NameInfo; 2928 NameInfo.setLoc(Name.StartLocation); 2929 2930 switch (Name.getKind()) { 2931 2932 case UnqualifiedId::IK_ImplicitSelfParam: 2933 case UnqualifiedId::IK_Identifier: 2934 NameInfo.setName(Name.Identifier); 2935 NameInfo.setLoc(Name.StartLocation); 2936 return NameInfo; 2937 2938 case UnqualifiedId::IK_OperatorFunctionId: 2939 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2940 Name.OperatorFunctionId.Operator)); 2941 NameInfo.setLoc(Name.StartLocation); 2942 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2943 = Name.OperatorFunctionId.SymbolLocations[0]; 2944 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2945 = Name.EndLocation.getRawEncoding(); 2946 return NameInfo; 2947 2948 case UnqualifiedId::IK_LiteralOperatorId: 2949 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2950 Name.Identifier)); 2951 NameInfo.setLoc(Name.StartLocation); 2952 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2953 return NameInfo; 2954 2955 case UnqualifiedId::IK_ConversionFunctionId: { 2956 TypeSourceInfo *TInfo; 2957 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2958 if (Ty.isNull()) 2959 return DeclarationNameInfo(); 2960 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2961 Context.getCanonicalType(Ty))); 2962 NameInfo.setLoc(Name.StartLocation); 2963 NameInfo.setNamedTypeInfo(TInfo); 2964 return NameInfo; 2965 } 2966 2967 case UnqualifiedId::IK_ConstructorName: { 2968 TypeSourceInfo *TInfo; 2969 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2970 if (Ty.isNull()) 2971 return DeclarationNameInfo(); 2972 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2973 Context.getCanonicalType(Ty))); 2974 NameInfo.setLoc(Name.StartLocation); 2975 NameInfo.setNamedTypeInfo(TInfo); 2976 return NameInfo; 2977 } 2978 2979 case UnqualifiedId::IK_ConstructorTemplateId: { 2980 // In well-formed code, we can only have a constructor 2981 // template-id that refers to the current context, so go there 2982 // to find the actual type being constructed. 2983 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2984 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2985 return DeclarationNameInfo(); 2986 2987 // Determine the type of the class being constructed. 2988 QualType CurClassType = Context.getTypeDeclType(CurClass); 2989 2990 // FIXME: Check two things: that the template-id names the same type as 2991 // CurClassType, and that the template-id does not occur when the name 2992 // was qualified. 2993 2994 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2995 Context.getCanonicalType(CurClassType))); 2996 NameInfo.setLoc(Name.StartLocation); 2997 // FIXME: should we retrieve TypeSourceInfo? 2998 NameInfo.setNamedTypeInfo(0); 2999 return NameInfo; 3000 } 3001 3002 case UnqualifiedId::IK_DestructorName: { 3003 TypeSourceInfo *TInfo; 3004 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3005 if (Ty.isNull()) 3006 return DeclarationNameInfo(); 3007 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3008 Context.getCanonicalType(Ty))); 3009 NameInfo.setLoc(Name.StartLocation); 3010 NameInfo.setNamedTypeInfo(TInfo); 3011 return NameInfo; 3012 } 3013 3014 case UnqualifiedId::IK_TemplateId: { 3015 TemplateName TName = Name.TemplateId->Template.get(); 3016 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3017 return Context.getNameForTemplate(TName, TNameLoc); 3018 } 3019 3020 } // switch (Name.getKind()) 3021 3022 llvm_unreachable("Unknown name kind"); 3023} 3024 3025static QualType getCoreType(QualType Ty) { 3026 do { 3027 if (Ty->isPointerType() || Ty->isReferenceType()) 3028 Ty = Ty->getPointeeType(); 3029 else if (Ty->isArrayType()) 3030 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3031 else 3032 return Ty.withoutLocalFastQualifiers(); 3033 } while (true); 3034} 3035 3036/// hasSimilarParameters - Determine whether the C++ functions Declaration 3037/// and Definition have "nearly" matching parameters. This heuristic is 3038/// used to improve diagnostics in the case where an out-of-line function 3039/// definition doesn't match any declaration within the class or namespace. 3040/// Also sets Params to the list of indices to the parameters that differ 3041/// between the declaration and the definition. If hasSimilarParameters 3042/// returns true and Params is empty, then all of the parameters match. 3043static bool hasSimilarParameters(ASTContext &Context, 3044 FunctionDecl *Declaration, 3045 FunctionDecl *Definition, 3046 llvm::SmallVectorImpl<unsigned> &Params) { 3047 Params.clear(); 3048 if (Declaration->param_size() != Definition->param_size()) 3049 return false; 3050 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3051 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3052 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3053 3054 // The parameter types are identical 3055 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3056 continue; 3057 3058 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3059 QualType DefParamBaseTy = getCoreType(DefParamTy); 3060 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3061 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3062 3063 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3064 (DeclTyName && DeclTyName == DefTyName)) 3065 Params.push_back(Idx); 3066 else // The two parameters aren't even close 3067 return false; 3068 } 3069 3070 return true; 3071} 3072 3073/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3074/// declarator needs to be rebuilt in the current instantiation. 3075/// Any bits of declarator which appear before the name are valid for 3076/// consideration here. That's specifically the type in the decl spec 3077/// and the base type in any member-pointer chunks. 3078static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3079 DeclarationName Name) { 3080 // The types we specifically need to rebuild are: 3081 // - typenames, typeofs, and decltypes 3082 // - types which will become injected class names 3083 // Of course, we also need to rebuild any type referencing such a 3084 // type. It's safest to just say "dependent", but we call out a 3085 // few cases here. 3086 3087 DeclSpec &DS = D.getMutableDeclSpec(); 3088 switch (DS.getTypeSpecType()) { 3089 case DeclSpec::TST_typename: 3090 case DeclSpec::TST_typeofType: 3091 case DeclSpec::TST_decltype: 3092 case DeclSpec::TST_underlyingType: 3093 case DeclSpec::TST_atomic: { 3094 // Grab the type from the parser. 3095 TypeSourceInfo *TSI = 0; 3096 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3097 if (T.isNull() || !T->isDependentType()) break; 3098 3099 // Make sure there's a type source info. This isn't really much 3100 // of a waste; most dependent types should have type source info 3101 // attached already. 3102 if (!TSI) 3103 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3104 3105 // Rebuild the type in the current instantiation. 3106 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3107 if (!TSI) return true; 3108 3109 // Store the new type back in the decl spec. 3110 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3111 DS.UpdateTypeRep(LocType); 3112 break; 3113 } 3114 3115 case DeclSpec::TST_typeofExpr: { 3116 Expr *E = DS.getRepAsExpr(); 3117 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3118 if (Result.isInvalid()) return true; 3119 DS.UpdateExprRep(Result.get()); 3120 break; 3121 } 3122 3123 default: 3124 // Nothing to do for these decl specs. 3125 break; 3126 } 3127 3128 // It doesn't matter what order we do this in. 3129 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3130 DeclaratorChunk &Chunk = D.getTypeObject(I); 3131 3132 // The only type information in the declarator which can come 3133 // before the declaration name is the base type of a member 3134 // pointer. 3135 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3136 continue; 3137 3138 // Rebuild the scope specifier in-place. 3139 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3140 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3141 return true; 3142 } 3143 3144 return false; 3145} 3146 3147Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3148 D.setFunctionDefinition(false); 3149 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3150} 3151 3152/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3153/// If T is the name of a class, then each of the following shall have a 3154/// name different from T: 3155/// - every static data member of class T; 3156/// - every member function of class T 3157/// - every member of class T that is itself a type; 3158/// \returns true if the declaration name violates these rules. 3159bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3160 DeclarationNameInfo NameInfo) { 3161 DeclarationName Name = NameInfo.getName(); 3162 3163 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3164 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3165 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3166 return true; 3167 } 3168 3169 return false; 3170} 3171 3172Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3173 MultiTemplateParamsArg TemplateParamLists) { 3174 // TODO: consider using NameInfo for diagnostic. 3175 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3176 DeclarationName Name = NameInfo.getName(); 3177 3178 // All of these full declarators require an identifier. If it doesn't have 3179 // one, the ParsedFreeStandingDeclSpec action should be used. 3180 if (!Name) { 3181 if (!D.isInvalidType()) // Reject this if we think it is valid. 3182 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3183 diag::err_declarator_need_ident) 3184 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3185 return 0; 3186 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3187 return 0; 3188 3189 // The scope passed in may not be a decl scope. Zip up the scope tree until 3190 // we find one that is. 3191 while ((S->getFlags() & Scope::DeclScope) == 0 || 3192 (S->getFlags() & Scope::TemplateParamScope) != 0) 3193 S = S->getParent(); 3194 3195 DeclContext *DC = CurContext; 3196 if (D.getCXXScopeSpec().isInvalid()) 3197 D.setInvalidType(); 3198 else if (D.getCXXScopeSpec().isSet()) { 3199 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3200 UPPC_DeclarationQualifier)) 3201 return 0; 3202 3203 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3204 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3205 if (!DC) { 3206 // If we could not compute the declaration context, it's because the 3207 // declaration context is dependent but does not refer to a class, 3208 // class template, or class template partial specialization. Complain 3209 // and return early, to avoid the coming semantic disaster. 3210 Diag(D.getIdentifierLoc(), 3211 diag::err_template_qualified_declarator_no_match) 3212 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3213 << D.getCXXScopeSpec().getRange(); 3214 return 0; 3215 } 3216 bool IsDependentContext = DC->isDependentContext(); 3217 3218 if (!IsDependentContext && 3219 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3220 return 0; 3221 3222 if (isa<CXXRecordDecl>(DC)) { 3223 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3224 Diag(D.getIdentifierLoc(), 3225 diag::err_member_def_undefined_record) 3226 << Name << DC << D.getCXXScopeSpec().getRange(); 3227 D.setInvalidType(); 3228 } else if (isa<CXXRecordDecl>(CurContext) && 3229 !D.getDeclSpec().isFriendSpecified()) { 3230 // The user provided a superfluous scope specifier inside a class 3231 // definition: 3232 // 3233 // class X { 3234 // void X::f(); 3235 // }; 3236 if (CurContext->Equals(DC)) 3237 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3238 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3239 else 3240 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3241 << Name << D.getCXXScopeSpec().getRange(); 3242 3243 // Pretend that this qualifier was not here. 3244 D.getCXXScopeSpec().clear(); 3245 } 3246 } 3247 3248 // Check whether we need to rebuild the type of the given 3249 // declaration in the current instantiation. 3250 if (EnteringContext && IsDependentContext && 3251 TemplateParamLists.size() != 0) { 3252 ContextRAII SavedContext(*this, DC); 3253 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3254 D.setInvalidType(); 3255 } 3256 } 3257 3258 if (DiagnoseClassNameShadow(DC, NameInfo)) 3259 // If this is a typedef, we'll end up spewing multiple diagnostics. 3260 // Just return early; it's safer. 3261 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3262 return 0; 3263 3264 NamedDecl *New; 3265 3266 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3267 QualType R = TInfo->getType(); 3268 3269 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3270 UPPC_DeclarationType)) 3271 D.setInvalidType(); 3272 3273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3274 ForRedeclaration); 3275 3276 // See if this is a redefinition of a variable in the same scope. 3277 if (!D.getCXXScopeSpec().isSet()) { 3278 bool IsLinkageLookup = false; 3279 3280 // If the declaration we're planning to build will be a function 3281 // or object with linkage, then look for another declaration with 3282 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3284 /* Do nothing*/; 3285 else if (R->isFunctionType()) { 3286 if (CurContext->isFunctionOrMethod() || 3287 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3288 IsLinkageLookup = true; 3289 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3290 IsLinkageLookup = true; 3291 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3292 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3293 IsLinkageLookup = true; 3294 3295 if (IsLinkageLookup) 3296 Previous.clear(LookupRedeclarationWithLinkage); 3297 3298 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3299 } else { // Something like "int foo::x;" 3300 LookupQualifiedName(Previous, DC); 3301 3302 // Don't consider using declarations as previous declarations for 3303 // out-of-line members. 3304 RemoveUsingDecls(Previous); 3305 3306 // C++ 7.3.1.2p2: 3307 // Members (including explicit specializations of templates) of a named 3308 // namespace can also be defined outside that namespace by explicit 3309 // qualification of the name being defined, provided that the entity being 3310 // defined was already declared in the namespace and the definition appears 3311 // after the point of declaration in a namespace that encloses the 3312 // declarations namespace. 3313 // 3314 // Note that we only check the context at this point. We don't yet 3315 // have enough information to make sure that PrevDecl is actually 3316 // the declaration we want to match. For example, given: 3317 // 3318 // class X { 3319 // void f(); 3320 // void f(float); 3321 // }; 3322 // 3323 // void X::f(int) { } // ill-formed 3324 // 3325 // In this case, PrevDecl will point to the overload set 3326 // containing the two f's declared in X, but neither of them 3327 // matches. 3328 3329 // First check whether we named the global scope. 3330 if (isa<TranslationUnitDecl>(DC)) { 3331 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3332 << Name << D.getCXXScopeSpec().getRange(); 3333 } else { 3334 DeclContext *Cur = CurContext; 3335 while (isa<LinkageSpecDecl>(Cur)) 3336 Cur = Cur->getParent(); 3337 if (!Cur->Encloses(DC)) { 3338 // The qualifying scope doesn't enclose the original declaration. 3339 // Emit diagnostic based on current scope. 3340 SourceLocation L = D.getIdentifierLoc(); 3341 SourceRange R = D.getCXXScopeSpec().getRange(); 3342 if (isa<FunctionDecl>(Cur)) 3343 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3344 else 3345 Diag(L, diag::err_invalid_declarator_scope) 3346 << Name << cast<NamedDecl>(DC) << R; 3347 D.setInvalidType(); 3348 } 3349 } 3350 } 3351 3352 if (Previous.isSingleResult() && 3353 Previous.getFoundDecl()->isTemplateParameter()) { 3354 // Maybe we will complain about the shadowed template parameter. 3355 if (!D.isInvalidType()) 3356 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3357 Previous.getFoundDecl()); 3358 3359 // Just pretend that we didn't see the previous declaration. 3360 Previous.clear(); 3361 } 3362 3363 // In C++, the previous declaration we find might be a tag type 3364 // (class or enum). In this case, the new declaration will hide the 3365 // tag type. Note that this does does not apply if we're declaring a 3366 // typedef (C++ [dcl.typedef]p4). 3367 if (Previous.isSingleTagDecl() && 3368 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3369 Previous.clear(); 3370 3371 bool AddToScope = true; 3372 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3373 if (TemplateParamLists.size()) { 3374 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3375 return 0; 3376 } 3377 3378 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3379 } else if (R->isFunctionType()) { 3380 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3381 move(TemplateParamLists), 3382 AddToScope); 3383 } else { 3384 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3385 move(TemplateParamLists)); 3386 } 3387 3388 if (New == 0) 3389 return 0; 3390 3391 // If this has an identifier and is not an invalid redeclaration or 3392 // function template specialization, add it to the scope stack. 3393 if (New->getDeclName() && AddToScope && 3394 !(D.isRedeclaration() && New->isInvalidDecl())) 3395 PushOnScopeChains(New, S); 3396 3397 return New; 3398} 3399 3400/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3401/// types into constant array types in certain situations which would otherwise 3402/// be errors (for GCC compatibility). 3403static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3404 ASTContext &Context, 3405 bool &SizeIsNegative, 3406 llvm::APSInt &Oversized) { 3407 // This method tries to turn a variable array into a constant 3408 // array even when the size isn't an ICE. This is necessary 3409 // for compatibility with code that depends on gcc's buggy 3410 // constant expression folding, like struct {char x[(int)(char*)2];} 3411 SizeIsNegative = false; 3412 Oversized = 0; 3413 3414 if (T->isDependentType()) 3415 return QualType(); 3416 3417 QualifierCollector Qs; 3418 const Type *Ty = Qs.strip(T); 3419 3420 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3421 QualType Pointee = PTy->getPointeeType(); 3422 QualType FixedType = 3423 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3424 Oversized); 3425 if (FixedType.isNull()) return FixedType; 3426 FixedType = Context.getPointerType(FixedType); 3427 return Qs.apply(Context, FixedType); 3428 } 3429 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3430 QualType Inner = PTy->getInnerType(); 3431 QualType FixedType = 3432 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3433 Oversized); 3434 if (FixedType.isNull()) return FixedType; 3435 FixedType = Context.getParenType(FixedType); 3436 return Qs.apply(Context, FixedType); 3437 } 3438 3439 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3440 if (!VLATy) 3441 return QualType(); 3442 // FIXME: We should probably handle this case 3443 if (VLATy->getElementType()->isVariablyModifiedType()) 3444 return QualType(); 3445 3446 Expr::EvalResult EvalResult; 3447 if (!VLATy->getSizeExpr() || 3448 !VLATy->getSizeExpr()->EvaluateAsRValue(EvalResult, Context) || 3449 !EvalResult.Val.isInt()) 3450 return QualType(); 3451 3452 // Check whether the array size is negative. 3453 llvm::APSInt &Res = EvalResult.Val.getInt(); 3454 if (Res.isSigned() && Res.isNegative()) { 3455 SizeIsNegative = true; 3456 return QualType(); 3457 } 3458 3459 // Check whether the array is too large to be addressed. 3460 unsigned ActiveSizeBits 3461 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3462 Res); 3463 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3464 Oversized = Res; 3465 return QualType(); 3466 } 3467 3468 return Context.getConstantArrayType(VLATy->getElementType(), 3469 Res, ArrayType::Normal, 0); 3470} 3471 3472/// \brief Register the given locally-scoped external C declaration so 3473/// that it can be found later for redeclarations 3474void 3475Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3476 const LookupResult &Previous, 3477 Scope *S) { 3478 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3479 "Decl is not a locally-scoped decl!"); 3480 // Note that we have a locally-scoped external with this name. 3481 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3482 3483 if (!Previous.isSingleResult()) 3484 return; 3485 3486 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3487 3488 // If there was a previous declaration of this variable, it may be 3489 // in our identifier chain. Update the identifier chain with the new 3490 // declaration. 3491 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3492 // The previous declaration was found on the identifer resolver 3493 // chain, so remove it from its scope. 3494 3495 if (S->isDeclScope(PrevDecl)) { 3496 // Special case for redeclarations in the SAME scope. 3497 // Because this declaration is going to be added to the identifier chain 3498 // later, we should temporarily take it OFF the chain. 3499 IdResolver.RemoveDecl(ND); 3500 3501 } else { 3502 // Find the scope for the original declaration. 3503 while (S && !S->isDeclScope(PrevDecl)) 3504 S = S->getParent(); 3505 } 3506 3507 if (S) 3508 S->RemoveDecl(PrevDecl); 3509 } 3510} 3511 3512llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3513Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3514 if (ExternalSource) { 3515 // Load locally-scoped external decls from the external source. 3516 SmallVector<NamedDecl *, 4> Decls; 3517 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3518 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3519 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3520 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3521 if (Pos == LocallyScopedExternalDecls.end()) 3522 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3523 } 3524 } 3525 3526 return LocallyScopedExternalDecls.find(Name); 3527} 3528 3529/// \brief Diagnose function specifiers on a declaration of an identifier that 3530/// does not identify a function. 3531void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3532 // FIXME: We should probably indicate the identifier in question to avoid 3533 // confusion for constructs like "inline int a(), b;" 3534 if (D.getDeclSpec().isInlineSpecified()) 3535 Diag(D.getDeclSpec().getInlineSpecLoc(), 3536 diag::err_inline_non_function); 3537 3538 if (D.getDeclSpec().isVirtualSpecified()) 3539 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3540 diag::err_virtual_non_function); 3541 3542 if (D.getDeclSpec().isExplicitSpecified()) 3543 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3544 diag::err_explicit_non_function); 3545} 3546 3547NamedDecl* 3548Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3549 TypeSourceInfo *TInfo, LookupResult &Previous) { 3550 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3551 if (D.getCXXScopeSpec().isSet()) { 3552 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3553 << D.getCXXScopeSpec().getRange(); 3554 D.setInvalidType(); 3555 // Pretend we didn't see the scope specifier. 3556 DC = CurContext; 3557 Previous.clear(); 3558 } 3559 3560 if (getLangOptions().CPlusPlus) { 3561 // Check that there are no default arguments (C++ only). 3562 CheckExtraCXXDefaultArguments(D); 3563 } 3564 3565 DiagnoseFunctionSpecifiers(D); 3566 3567 if (D.getDeclSpec().isThreadSpecified()) 3568 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3569 if (D.getDeclSpec().isConstexprSpecified()) 3570 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3571 << 1; 3572 3573 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3574 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3575 << D.getName().getSourceRange(); 3576 return 0; 3577 } 3578 3579 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3580 if (!NewTD) return 0; 3581 3582 // Handle attributes prior to checking for duplicates in MergeVarDecl 3583 ProcessDeclAttributes(S, NewTD, D); 3584 3585 CheckTypedefForVariablyModifiedType(S, NewTD); 3586 3587 bool Redeclaration = D.isRedeclaration(); 3588 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3589 D.setRedeclaration(Redeclaration); 3590 return ND; 3591} 3592 3593void 3594Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3595 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3596 // then it shall have block scope. 3597 // Note that variably modified types must be fixed before merging the decl so 3598 // that redeclarations will match. 3599 QualType T = NewTD->getUnderlyingType(); 3600 if (T->isVariablyModifiedType()) { 3601 getCurFunction()->setHasBranchProtectedScope(); 3602 3603 if (S->getFnParent() == 0) { 3604 bool SizeIsNegative; 3605 llvm::APSInt Oversized; 3606 QualType FixedTy = 3607 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3608 Oversized); 3609 if (!FixedTy.isNull()) { 3610 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3611 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3612 } else { 3613 if (SizeIsNegative) 3614 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3615 else if (T->isVariableArrayType()) 3616 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3617 else if (Oversized.getBoolValue()) 3618 Diag(NewTD->getLocation(), diag::err_array_too_large) 3619 << Oversized.toString(10); 3620 else 3621 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3622 NewTD->setInvalidDecl(); 3623 } 3624 } 3625 } 3626} 3627 3628 3629/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3630/// declares a typedef-name, either using the 'typedef' type specifier or via 3631/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3632NamedDecl* 3633Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3634 LookupResult &Previous, bool &Redeclaration) { 3635 // Merge the decl with the existing one if appropriate. If the decl is 3636 // in an outer scope, it isn't the same thing. 3637 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3638 /*ExplicitInstantiationOrSpecialization=*/false); 3639 if (!Previous.empty()) { 3640 Redeclaration = true; 3641 MergeTypedefNameDecl(NewTD, Previous); 3642 } 3643 3644 // If this is the C FILE type, notify the AST context. 3645 if (IdentifierInfo *II = NewTD->getIdentifier()) 3646 if (!NewTD->isInvalidDecl() && 3647 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3648 if (II->isStr("FILE")) 3649 Context.setFILEDecl(NewTD); 3650 else if (II->isStr("jmp_buf")) 3651 Context.setjmp_bufDecl(NewTD); 3652 else if (II->isStr("sigjmp_buf")) 3653 Context.setsigjmp_bufDecl(NewTD); 3654 else if (II->isStr("__builtin_va_list")) 3655 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3656 } 3657 3658 return NewTD; 3659} 3660 3661/// \brief Determines whether the given declaration is an out-of-scope 3662/// previous declaration. 3663/// 3664/// This routine should be invoked when name lookup has found a 3665/// previous declaration (PrevDecl) that is not in the scope where a 3666/// new declaration by the same name is being introduced. If the new 3667/// declaration occurs in a local scope, previous declarations with 3668/// linkage may still be considered previous declarations (C99 3669/// 6.2.2p4-5, C++ [basic.link]p6). 3670/// 3671/// \param PrevDecl the previous declaration found by name 3672/// lookup 3673/// 3674/// \param DC the context in which the new declaration is being 3675/// declared. 3676/// 3677/// \returns true if PrevDecl is an out-of-scope previous declaration 3678/// for a new delcaration with the same name. 3679static bool 3680isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3681 ASTContext &Context) { 3682 if (!PrevDecl) 3683 return false; 3684 3685 if (!PrevDecl->hasLinkage()) 3686 return false; 3687 3688 if (Context.getLangOptions().CPlusPlus) { 3689 // C++ [basic.link]p6: 3690 // If there is a visible declaration of an entity with linkage 3691 // having the same name and type, ignoring entities declared 3692 // outside the innermost enclosing namespace scope, the block 3693 // scope declaration declares that same entity and receives the 3694 // linkage of the previous declaration. 3695 DeclContext *OuterContext = DC->getRedeclContext(); 3696 if (!OuterContext->isFunctionOrMethod()) 3697 // This rule only applies to block-scope declarations. 3698 return false; 3699 3700 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3701 if (PrevOuterContext->isRecord()) 3702 // We found a member function: ignore it. 3703 return false; 3704 3705 // Find the innermost enclosing namespace for the new and 3706 // previous declarations. 3707 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3708 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3709 3710 // The previous declaration is in a different namespace, so it 3711 // isn't the same function. 3712 if (!OuterContext->Equals(PrevOuterContext)) 3713 return false; 3714 } 3715 3716 return true; 3717} 3718 3719static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3720 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3721 if (!SS.isSet()) return; 3722 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3723} 3724 3725bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3726 QualType type = decl->getType(); 3727 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3728 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3729 // Various kinds of declaration aren't allowed to be __autoreleasing. 3730 unsigned kind = -1U; 3731 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3732 if (var->hasAttr<BlocksAttr>()) 3733 kind = 0; // __block 3734 else if (!var->hasLocalStorage()) 3735 kind = 1; // global 3736 } else if (isa<ObjCIvarDecl>(decl)) { 3737 kind = 3; // ivar 3738 } else if (isa<FieldDecl>(decl)) { 3739 kind = 2; // field 3740 } 3741 3742 if (kind != -1U) { 3743 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3744 << kind; 3745 } 3746 } else if (lifetime == Qualifiers::OCL_None) { 3747 // Try to infer lifetime. 3748 if (!type->isObjCLifetimeType()) 3749 return false; 3750 3751 lifetime = type->getObjCARCImplicitLifetime(); 3752 type = Context.getLifetimeQualifiedType(type, lifetime); 3753 decl->setType(type); 3754 } 3755 3756 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3757 // Thread-local variables cannot have lifetime. 3758 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3759 var->isThreadSpecified()) { 3760 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3761 << var->getType(); 3762 return true; 3763 } 3764 } 3765 3766 return false; 3767} 3768 3769NamedDecl* 3770Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3771 TypeSourceInfo *TInfo, LookupResult &Previous, 3772 MultiTemplateParamsArg TemplateParamLists) { 3773 QualType R = TInfo->getType(); 3774 DeclarationName Name = GetNameForDeclarator(D).getName(); 3775 3776 // Check that there are no default arguments (C++ only). 3777 if (getLangOptions().CPlusPlus) 3778 CheckExtraCXXDefaultArguments(D); 3779 3780 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3781 assert(SCSpec != DeclSpec::SCS_typedef && 3782 "Parser allowed 'typedef' as storage class VarDecl."); 3783 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3784 if (SCSpec == DeclSpec::SCS_mutable) { 3785 // mutable can only appear on non-static class members, so it's always 3786 // an error here 3787 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3788 D.setInvalidType(); 3789 SC = SC_None; 3790 } 3791 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3792 VarDecl::StorageClass SCAsWritten 3793 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3794 3795 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3796 if (!II) { 3797 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3798 << Name; 3799 return 0; 3800 } 3801 3802 DiagnoseFunctionSpecifiers(D); 3803 3804 if (!DC->isRecord() && S->getFnParent() == 0) { 3805 // C99 6.9p2: The storage-class specifiers auto and register shall not 3806 // appear in the declaration specifiers in an external declaration. 3807 if (SC == SC_Auto || SC == SC_Register) { 3808 3809 // If this is a register variable with an asm label specified, then this 3810 // is a GNU extension. 3811 if (SC == SC_Register && D.getAsmLabel()) 3812 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3813 else 3814 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3815 D.setInvalidType(); 3816 } 3817 } 3818 3819 if (getLangOptions().OpenCL) { 3820 // Set up the special work-group-local storage class for variables in the 3821 // OpenCL __local address space. 3822 if (R.getAddressSpace() == LangAS::opencl_local) 3823 SC = SC_OpenCLWorkGroupLocal; 3824 } 3825 3826 bool isExplicitSpecialization = false; 3827 VarDecl *NewVD; 3828 if (!getLangOptions().CPlusPlus) { 3829 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3830 D.getIdentifierLoc(), II, 3831 R, TInfo, SC, SCAsWritten); 3832 3833 if (D.isInvalidType()) 3834 NewVD->setInvalidDecl(); 3835 } else { 3836 if (DC->isRecord() && !CurContext->isRecord()) { 3837 // This is an out-of-line definition of a static data member. 3838 if (SC == SC_Static) { 3839 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3840 diag::err_static_out_of_line) 3841 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3842 } else if (SC == SC_None) 3843 SC = SC_Static; 3844 } 3845 if (SC == SC_Static) { 3846 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3847 if (RD->isLocalClass()) 3848 Diag(D.getIdentifierLoc(), 3849 diag::err_static_data_member_not_allowed_in_local_class) 3850 << Name << RD->getDeclName(); 3851 3852 // C++ [class.union]p1: If a union contains a static data member, 3853 // the program is ill-formed. 3854 // 3855 // We also disallow static data members in anonymous structs. 3856 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3857 Diag(D.getIdentifierLoc(), 3858 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3859 << Name << RD->isUnion(); 3860 } 3861 } 3862 3863 // Match up the template parameter lists with the scope specifier, then 3864 // determine whether we have a template or a template specialization. 3865 isExplicitSpecialization = false; 3866 bool Invalid = false; 3867 if (TemplateParameterList *TemplateParams 3868 = MatchTemplateParametersToScopeSpecifier( 3869 D.getDeclSpec().getSourceRange().getBegin(), 3870 D.getIdentifierLoc(), 3871 D.getCXXScopeSpec(), 3872 TemplateParamLists.get(), 3873 TemplateParamLists.size(), 3874 /*never a friend*/ false, 3875 isExplicitSpecialization, 3876 Invalid)) { 3877 if (TemplateParams->size() > 0) { 3878 // There is no such thing as a variable template. 3879 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3880 << II 3881 << SourceRange(TemplateParams->getTemplateLoc(), 3882 TemplateParams->getRAngleLoc()); 3883 return 0; 3884 } else { 3885 // There is an extraneous 'template<>' for this variable. Complain 3886 // about it, but allow the declaration of the variable. 3887 Diag(TemplateParams->getTemplateLoc(), 3888 diag::err_template_variable_noparams) 3889 << II 3890 << SourceRange(TemplateParams->getTemplateLoc(), 3891 TemplateParams->getRAngleLoc()); 3892 } 3893 } 3894 3895 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3896 D.getIdentifierLoc(), II, 3897 R, TInfo, SC, SCAsWritten); 3898 3899 // If this decl has an auto type in need of deduction, make a note of the 3900 // Decl so we can diagnose uses of it in its own initializer. 3901 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3902 R->getContainedAutoType()) 3903 ParsingInitForAutoVars.insert(NewVD); 3904 3905 if (D.isInvalidType() || Invalid) 3906 NewVD->setInvalidDecl(); 3907 3908 SetNestedNameSpecifier(NewVD, D); 3909 3910 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3911 NewVD->setTemplateParameterListsInfo(Context, 3912 TemplateParamLists.size(), 3913 TemplateParamLists.release()); 3914 } 3915 3916 if (D.getDeclSpec().isConstexprSpecified()) { 3917 // FIXME: once we know whether there's an initializer, apply this to 3918 // static data members too. 3919 if (!NewVD->isStaticDataMember() && 3920 !NewVD->isThisDeclarationADefinition()) { 3921 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3922 // of a variable. Suggest replacing it with 'const' if appropriate. 3923 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3924 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3925 // If the declarator is complex, we need to move the keyword to the 3926 // innermost chunk as we switch it from 'constexpr' to 'const'. 3927 int Kind = DeclaratorChunk::Paren; 3928 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3929 Kind = D.getTypeObject(I).Kind; 3930 if (Kind != DeclaratorChunk::Paren) 3931 break; 3932 } 3933 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3934 Kind == DeclaratorChunk::Reference) 3935 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3936 << FixItHint::CreateRemoval(ConstexprRange); 3937 else if (Kind == DeclaratorChunk::Paren) 3938 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3939 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3940 else 3941 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3942 << FixItHint::CreateRemoval(ConstexprRange) 3943 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3944 } else { 3945 NewVD->setConstexpr(true); 3946 } 3947 } 3948 } 3949 3950 // Set the lexical context. If the declarator has a C++ scope specifier, the 3951 // lexical context will be different from the semantic context. 3952 NewVD->setLexicalDeclContext(CurContext); 3953 3954 if (D.getDeclSpec().isThreadSpecified()) { 3955 if (NewVD->hasLocalStorage()) 3956 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3957 else if (!Context.getTargetInfo().isTLSSupported()) 3958 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3959 else 3960 NewVD->setThreadSpecified(true); 3961 } 3962 3963 if (D.getDeclSpec().isModulePrivateSpecified()) { 3964 if (isExplicitSpecialization) 3965 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3966 << 2 3967 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3968 else if (NewVD->hasLocalStorage()) 3969 Diag(NewVD->getLocation(), diag::err_module_private_local) 3970 << 0 << NewVD->getDeclName() 3971 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3972 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3973 else 3974 NewVD->setModulePrivate(); 3975 } 3976 3977 // Handle attributes prior to checking for duplicates in MergeVarDecl 3978 ProcessDeclAttributes(S, NewVD, D); 3979 3980 // In auto-retain/release, infer strong retension for variables of 3981 // retainable type. 3982 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3983 NewVD->setInvalidDecl(); 3984 3985 // Handle GNU asm-label extension (encoded as an attribute). 3986 if (Expr *E = (Expr*)D.getAsmLabel()) { 3987 // The parser guarantees this is a string. 3988 StringLiteral *SE = cast<StringLiteral>(E); 3989 StringRef Label = SE->getString(); 3990 if (S->getFnParent() != 0) { 3991 switch (SC) { 3992 case SC_None: 3993 case SC_Auto: 3994 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3995 break; 3996 case SC_Register: 3997 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3998 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3999 break; 4000 case SC_Static: 4001 case SC_Extern: 4002 case SC_PrivateExtern: 4003 case SC_OpenCLWorkGroupLocal: 4004 break; 4005 } 4006 } 4007 4008 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4009 Context, Label)); 4010 } 4011 4012 // Diagnose shadowed variables before filtering for scope. 4013 if (!D.getCXXScopeSpec().isSet()) 4014 CheckShadow(S, NewVD, Previous); 4015 4016 // Don't consider existing declarations that are in a different 4017 // scope and are out-of-semantic-context declarations (if the new 4018 // declaration has linkage). 4019 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4020 isExplicitSpecialization); 4021 4022 if (!getLangOptions().CPlusPlus) { 4023 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4024 } else { 4025 // Merge the decl with the existing one if appropriate. 4026 if (!Previous.empty()) { 4027 if (Previous.isSingleResult() && 4028 isa<FieldDecl>(Previous.getFoundDecl()) && 4029 D.getCXXScopeSpec().isSet()) { 4030 // The user tried to define a non-static data member 4031 // out-of-line (C++ [dcl.meaning]p1). 4032 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4033 << D.getCXXScopeSpec().getRange(); 4034 Previous.clear(); 4035 NewVD->setInvalidDecl(); 4036 } 4037 } else if (D.getCXXScopeSpec().isSet()) { 4038 // No previous declaration in the qualifying scope. 4039 Diag(D.getIdentifierLoc(), diag::err_no_member) 4040 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4041 << D.getCXXScopeSpec().getRange(); 4042 NewVD->setInvalidDecl(); 4043 } 4044 4045 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4046 4047 // This is an explicit specialization of a static data member. Check it. 4048 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4049 CheckMemberSpecialization(NewVD, Previous)) 4050 NewVD->setInvalidDecl(); 4051 } 4052 4053 // attributes declared post-definition are currently ignored 4054 // FIXME: This should be handled in attribute merging, not 4055 // here. 4056 if (Previous.isSingleResult()) { 4057 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4058 if (Def && (Def = Def->getDefinition()) && 4059 Def != NewVD && D.hasAttributes()) { 4060 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4061 Diag(Def->getLocation(), diag::note_previous_definition); 4062 } 4063 } 4064 4065 // If this is a locally-scoped extern C variable, update the map of 4066 // such variables. 4067 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4068 !NewVD->isInvalidDecl()) 4069 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4070 4071 // If there's a #pragma GCC visibility in scope, and this isn't a class 4072 // member, set the visibility of this variable. 4073 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4074 AddPushedVisibilityAttribute(NewVD); 4075 4076 MarkUnusedFileScopedDecl(NewVD); 4077 4078 return NewVD; 4079} 4080 4081/// \brief Diagnose variable or built-in function shadowing. Implements 4082/// -Wshadow. 4083/// 4084/// This method is called whenever a VarDecl is added to a "useful" 4085/// scope. 4086/// 4087/// \param S the scope in which the shadowing name is being declared 4088/// \param R the lookup of the name 4089/// 4090void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4091 // Return if warning is ignored. 4092 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4093 DiagnosticsEngine::Ignored) 4094 return; 4095 4096 // Don't diagnose declarations at file scope. 4097 if (D->hasGlobalStorage()) 4098 return; 4099 4100 DeclContext *NewDC = D->getDeclContext(); 4101 4102 // Only diagnose if we're shadowing an unambiguous field or variable. 4103 if (R.getResultKind() != LookupResult::Found) 4104 return; 4105 4106 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4107 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4108 return; 4109 4110 // Fields are not shadowed by variables in C++ static methods. 4111 if (isa<FieldDecl>(ShadowedDecl)) 4112 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4113 if (MD->isStatic()) 4114 return; 4115 4116 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4117 if (shadowedVar->isExternC()) { 4118 // For shadowing external vars, make sure that we point to the global 4119 // declaration, not a locally scoped extern declaration. 4120 for (VarDecl::redecl_iterator 4121 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4122 I != E; ++I) 4123 if (I->isFileVarDecl()) { 4124 ShadowedDecl = *I; 4125 break; 4126 } 4127 } 4128 4129 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4130 4131 // Only warn about certain kinds of shadowing for class members. 4132 if (NewDC && NewDC->isRecord()) { 4133 // In particular, don't warn about shadowing non-class members. 4134 if (!OldDC->isRecord()) 4135 return; 4136 4137 // TODO: should we warn about static data members shadowing 4138 // static data members from base classes? 4139 4140 // TODO: don't diagnose for inaccessible shadowed members. 4141 // This is hard to do perfectly because we might friend the 4142 // shadowing context, but that's just a false negative. 4143 } 4144 4145 // Determine what kind of declaration we're shadowing. 4146 unsigned Kind; 4147 if (isa<RecordDecl>(OldDC)) { 4148 if (isa<FieldDecl>(ShadowedDecl)) 4149 Kind = 3; // field 4150 else 4151 Kind = 2; // static data member 4152 } else if (OldDC->isFileContext()) 4153 Kind = 1; // global 4154 else 4155 Kind = 0; // local 4156 4157 DeclarationName Name = R.getLookupName(); 4158 4159 // Emit warning and note. 4160 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4161 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4162} 4163 4164/// \brief Check -Wshadow without the advantage of a previous lookup. 4165void Sema::CheckShadow(Scope *S, VarDecl *D) { 4166 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4167 DiagnosticsEngine::Ignored) 4168 return; 4169 4170 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4171 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4172 LookupName(R, S); 4173 CheckShadow(S, D, R); 4174} 4175 4176/// \brief Perform semantic checking on a newly-created variable 4177/// declaration. 4178/// 4179/// This routine performs all of the type-checking required for a 4180/// variable declaration once it has been built. It is used both to 4181/// check variables after they have been parsed and their declarators 4182/// have been translated into a declaration, and to check variables 4183/// that have been instantiated from a template. 4184/// 4185/// Sets NewVD->isInvalidDecl() if an error was encountered. 4186/// 4187/// Returns true if the variable declaration is a redeclaration. 4188bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4189 LookupResult &Previous) { 4190 // If the decl is already known invalid, don't check it. 4191 if (NewVD->isInvalidDecl()) 4192 return false; 4193 4194 QualType T = NewVD->getType(); 4195 4196 if (T->isObjCObjectType()) { 4197 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4198 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4199 T = Context.getObjCObjectPointerType(T); 4200 NewVD->setType(T); 4201 } 4202 4203 // Emit an error if an address space was applied to decl with local storage. 4204 // This includes arrays of objects with address space qualifiers, but not 4205 // automatic variables that point to other address spaces. 4206 // ISO/IEC TR 18037 S5.1.2 4207 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4208 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4209 NewVD->setInvalidDecl(); 4210 return false; 4211 } 4212 4213 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4214 && !NewVD->hasAttr<BlocksAttr>()) { 4215 if (getLangOptions().getGC() != LangOptions::NonGC) 4216 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4217 else 4218 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4219 } 4220 4221 bool isVM = T->isVariablyModifiedType(); 4222 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4223 NewVD->hasAttr<BlocksAttr>()) 4224 getCurFunction()->setHasBranchProtectedScope(); 4225 4226 if ((isVM && NewVD->hasLinkage()) || 4227 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4228 bool SizeIsNegative; 4229 llvm::APSInt Oversized; 4230 QualType FixedTy = 4231 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4232 Oversized); 4233 4234 if (FixedTy.isNull() && T->isVariableArrayType()) { 4235 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4236 // FIXME: This won't give the correct result for 4237 // int a[10][n]; 4238 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4239 4240 if (NewVD->isFileVarDecl()) 4241 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4242 << SizeRange; 4243 else if (NewVD->getStorageClass() == SC_Static) 4244 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4245 << SizeRange; 4246 else 4247 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4248 << SizeRange; 4249 NewVD->setInvalidDecl(); 4250 return false; 4251 } 4252 4253 if (FixedTy.isNull()) { 4254 if (NewVD->isFileVarDecl()) 4255 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4256 else 4257 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4258 NewVD->setInvalidDecl(); 4259 return false; 4260 } 4261 4262 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4263 NewVD->setType(FixedTy); 4264 } 4265 4266 if (Previous.empty() && NewVD->isExternC()) { 4267 // Since we did not find anything by this name and we're declaring 4268 // an extern "C" variable, look for a non-visible extern "C" 4269 // declaration with the same name. 4270 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4271 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4272 if (Pos != LocallyScopedExternalDecls.end()) 4273 Previous.addDecl(Pos->second); 4274 } 4275 4276 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4277 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4278 << T; 4279 NewVD->setInvalidDecl(); 4280 return false; 4281 } 4282 4283 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4284 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4285 NewVD->setInvalidDecl(); 4286 return false; 4287 } 4288 4289 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4290 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4291 NewVD->setInvalidDecl(); 4292 return false; 4293 } 4294 4295 // Function pointers and references cannot have qualified function type, only 4296 // function pointer-to-members can do that. 4297 QualType Pointee; 4298 unsigned PtrOrRef = 0; 4299 if (const PointerType *Ptr = T->getAs<PointerType>()) 4300 Pointee = Ptr->getPointeeType(); 4301 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4302 Pointee = Ref->getPointeeType(); 4303 PtrOrRef = 1; 4304 } 4305 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4306 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4307 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4308 << PtrOrRef; 4309 NewVD->setInvalidDecl(); 4310 return false; 4311 } 4312 4313 if (!Previous.empty()) { 4314 MergeVarDecl(NewVD, Previous); 4315 return true; 4316 } 4317 return false; 4318} 4319 4320/// \brief Data used with FindOverriddenMethod 4321struct FindOverriddenMethodData { 4322 Sema *S; 4323 CXXMethodDecl *Method; 4324}; 4325 4326/// \brief Member lookup function that determines whether a given C++ 4327/// method overrides a method in a base class, to be used with 4328/// CXXRecordDecl::lookupInBases(). 4329static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4330 CXXBasePath &Path, 4331 void *UserData) { 4332 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4333 4334 FindOverriddenMethodData *Data 4335 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4336 4337 DeclarationName Name = Data->Method->getDeclName(); 4338 4339 // FIXME: Do we care about other names here too? 4340 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4341 // We really want to find the base class destructor here. 4342 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4343 CanQualType CT = Data->S->Context.getCanonicalType(T); 4344 4345 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4346 } 4347 4348 for (Path.Decls = BaseRecord->lookup(Name); 4349 Path.Decls.first != Path.Decls.second; 4350 ++Path.Decls.first) { 4351 NamedDecl *D = *Path.Decls.first; 4352 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4353 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4354 return true; 4355 } 4356 } 4357 4358 return false; 4359} 4360 4361/// AddOverriddenMethods - See if a method overrides any in the base classes, 4362/// and if so, check that it's a valid override and remember it. 4363bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4364 // Look for virtual methods in base classes that this method might override. 4365 CXXBasePaths Paths; 4366 FindOverriddenMethodData Data; 4367 Data.Method = MD; 4368 Data.S = this; 4369 bool AddedAny = false; 4370 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4371 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4372 E = Paths.found_decls_end(); I != E; ++I) { 4373 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4374 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4375 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4376 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4377 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4378 AddedAny = true; 4379 } 4380 } 4381 } 4382 } 4383 4384 return AddedAny; 4385} 4386 4387namespace { 4388 // Struct for holding all of the extra arguments needed by 4389 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4390 struct ActOnFDArgs { 4391 Scope *S; 4392 Declarator &D; 4393 MultiTemplateParamsArg TemplateParamLists; 4394 bool AddToScope; 4395 }; 4396} 4397 4398/// \brief Generate diagnostics for an invalid function redeclaration. 4399/// 4400/// This routine handles generating the diagnostic messages for an invalid 4401/// function redeclaration, including finding possible similar declarations 4402/// or performing typo correction if there are no previous declarations with 4403/// the same name. 4404/// 4405/// Returns a NamedDecl iff typo correction was performed and substituting in 4406/// the new declaration name does not cause new errors. 4407static NamedDecl* DiagnoseInvalidRedeclaration( 4408 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4409 ActOnFDArgs &ExtraArgs) { 4410 NamedDecl *Result = NULL; 4411 DeclarationName Name = NewFD->getDeclName(); 4412 DeclContext *NewDC = NewFD->getDeclContext(); 4413 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4414 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4415 llvm::SmallVector<unsigned, 1> MismatchedParams; 4416 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4417 TypoCorrection Correction; 4418 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4419 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4420 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4421 : diag::err_member_def_does_not_match; 4422 4423 NewFD->setInvalidDecl(); 4424 SemaRef.LookupQualifiedName(Prev, NewDC); 4425 assert(!Prev.isAmbiguous() && 4426 "Cannot have an ambiguity in previous-declaration lookup"); 4427 if (!Prev.empty()) { 4428 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4429 Func != FuncEnd; ++Func) { 4430 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4431 if (FD && 4432 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4433 // Add 1 to the index so that 0 can mean the mismatch didn't 4434 // involve a parameter 4435 unsigned ParamNum = 4436 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4437 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4438 } 4439 } 4440 // If the qualified name lookup yielded nothing, try typo correction 4441 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4442 Prev.getLookupKind(), 0, 0, NewDC)) && 4443 Correction.getCorrection() != Name) { 4444 // Trap errors. 4445 Sema::SFINAETrap Trap(SemaRef); 4446 4447 // Set up everything for the call to ActOnFunctionDeclarator 4448 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4449 ExtraArgs.D.getIdentifierLoc()); 4450 Previous.clear(); 4451 Previous.setLookupName(Correction.getCorrection()); 4452 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4453 CDeclEnd = Correction.end(); 4454 CDecl != CDeclEnd; ++CDecl) { 4455 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4456 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4457 MismatchedParams)) { 4458 Previous.addDecl(FD); 4459 } 4460 } 4461 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4462 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4463 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4464 // eliminate the need for the parameter pack ExtraArgs. 4465 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4466 NewFD->getDeclContext(), 4467 NewFD->getTypeSourceInfo(), 4468 Previous, 4469 ExtraArgs.TemplateParamLists, 4470 ExtraArgs.AddToScope); 4471 if (Trap.hasErrorOccurred()) { 4472 // Pretend the typo correction never occurred 4473 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4474 ExtraArgs.D.getIdentifierLoc()); 4475 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4476 Previous.clear(); 4477 Previous.setLookupName(Name); 4478 Result = NULL; 4479 } else { 4480 for (LookupResult::iterator Func = Previous.begin(), 4481 FuncEnd = Previous.end(); 4482 Func != FuncEnd; ++Func) { 4483 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4484 NearMatches.push_back(std::make_pair(FD, 0)); 4485 } 4486 } 4487 if (NearMatches.empty()) { 4488 // Ignore the correction if it didn't yield any close FunctionDecl matches 4489 Correction = TypoCorrection(); 4490 } else { 4491 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4492 : diag::err_member_def_does_not_match_suggest; 4493 } 4494 } 4495 4496 if (Correction) 4497 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4498 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4499 << FixItHint::CreateReplacement( 4500 NewFD->getLocation(), 4501 Correction.getAsString(SemaRef.getLangOptions())); 4502 else 4503 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4504 << Name << NewDC << NewFD->getLocation(); 4505 4506 bool NewFDisConst = false; 4507 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4508 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4509 4510 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4511 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4512 NearMatch != NearMatchEnd; ++NearMatch) { 4513 FunctionDecl *FD = NearMatch->first; 4514 bool FDisConst = false; 4515 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4516 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4517 4518 if (unsigned Idx = NearMatch->second) { 4519 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4520 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4521 diag::note_member_def_close_param_match) 4522 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4523 } else if (Correction) { 4524 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4525 << Correction.getQuoted(SemaRef.getLangOptions()); 4526 } else if (FDisConst != NewFDisConst) { 4527 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4528 << NewFDisConst << FD->getSourceRange().getEnd(); 4529 } else 4530 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4531 } 4532 return Result; 4533} 4534 4535static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4536 Declarator &D) { 4537 switch (D.getDeclSpec().getStorageClassSpec()) { 4538 default: llvm_unreachable("Unknown storage class!"); 4539 case DeclSpec::SCS_auto: 4540 case DeclSpec::SCS_register: 4541 case DeclSpec::SCS_mutable: 4542 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4543 diag::err_typecheck_sclass_func); 4544 D.setInvalidType(); 4545 break; 4546 case DeclSpec::SCS_unspecified: break; 4547 case DeclSpec::SCS_extern: return SC_Extern; 4548 case DeclSpec::SCS_static: { 4549 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4550 // C99 6.7.1p5: 4551 // The declaration of an identifier for a function that has 4552 // block scope shall have no explicit storage-class specifier 4553 // other than extern 4554 // See also (C++ [dcl.stc]p4). 4555 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4556 diag::err_static_block_func); 4557 break; 4558 } else 4559 return SC_Static; 4560 } 4561 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4562 } 4563 4564 // No explicit storage class has already been returned 4565 return SC_None; 4566} 4567 4568static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4569 DeclContext *DC, QualType &R, 4570 TypeSourceInfo *TInfo, 4571 FunctionDecl::StorageClass SC, 4572 bool &IsVirtualOkay) { 4573 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4574 DeclarationName Name = NameInfo.getName(); 4575 4576 FunctionDecl *NewFD = 0; 4577 bool isInline = D.getDeclSpec().isInlineSpecified(); 4578 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4579 FunctionDecl::StorageClass SCAsWritten 4580 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4581 4582 if (!SemaRef.getLangOptions().CPlusPlus) { 4583 // Determine whether the function was written with a 4584 // prototype. This true when: 4585 // - there is a prototype in the declarator, or 4586 // - the type R of the function is some kind of typedef or other reference 4587 // to a type name (which eventually refers to a function type). 4588 bool HasPrototype = 4589 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4590 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4591 4592 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4593 D.getSourceRange().getBegin(), NameInfo, R, 4594 TInfo, SC, SCAsWritten, isInline, 4595 HasPrototype); 4596 if (D.isInvalidType()) 4597 NewFD->setInvalidDecl(); 4598 4599 // Set the lexical context. 4600 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4601 4602 return NewFD; 4603 } 4604 4605 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4606 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4607 4608 // Check that the return type is not an abstract class type. 4609 // For record types, this is done by the AbstractClassUsageDiagnoser once 4610 // the class has been completely parsed. 4611 if (!DC->isRecord() && 4612 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4613 R->getAs<FunctionType>()->getResultType(), 4614 diag::err_abstract_type_in_decl, 4615 SemaRef.AbstractReturnType)) 4616 D.setInvalidType(); 4617 4618 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4619 // This is a C++ constructor declaration. 4620 assert(DC->isRecord() && 4621 "Constructors can only be declared in a member context"); 4622 4623 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4624 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4625 D.getSourceRange().getBegin(), NameInfo, 4626 R, TInfo, isExplicit, isInline, 4627 /*isImplicitlyDeclared=*/false, 4628 isConstexpr); 4629 4630 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4631 // This is a C++ destructor declaration. 4632 if (DC->isRecord()) { 4633 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4634 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4635 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4636 SemaRef.Context, Record, 4637 D.getSourceRange().getBegin(), 4638 NameInfo, R, TInfo, isInline, 4639 /*isImplicitlyDeclared=*/false); 4640 4641 // If the class is complete, then we now create the implicit exception 4642 // specification. If the class is incomplete or dependent, we can't do 4643 // it yet. 4644 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4645 Record->getDefinition() && !Record->isBeingDefined() && 4646 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4647 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4648 } 4649 4650 IsVirtualOkay = true; 4651 return NewDD; 4652 4653 } else { 4654 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4655 D.setInvalidType(); 4656 4657 // Create a FunctionDecl to satisfy the function definition parsing 4658 // code path. 4659 return FunctionDecl::Create(SemaRef.Context, DC, 4660 D.getSourceRange().getBegin(), 4661 D.getIdentifierLoc(), Name, R, TInfo, 4662 SC, SCAsWritten, isInline, 4663 /*hasPrototype=*/true, isConstexpr); 4664 } 4665 4666 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4667 if (!DC->isRecord()) { 4668 SemaRef.Diag(D.getIdentifierLoc(), 4669 diag::err_conv_function_not_member); 4670 return 0; 4671 } 4672 4673 SemaRef.CheckConversionDeclarator(D, R, SC); 4674 IsVirtualOkay = true; 4675 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4676 D.getSourceRange().getBegin(), NameInfo, 4677 R, TInfo, isInline, isExplicit, 4678 isConstexpr, SourceLocation()); 4679 4680 } else if (DC->isRecord()) { 4681 // If the name of the function is the same as the name of the record, 4682 // then this must be an invalid constructor that has a return type. 4683 // (The parser checks for a return type and makes the declarator a 4684 // constructor if it has no return type). 4685 if (Name.getAsIdentifierInfo() && 4686 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4687 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4688 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4689 << SourceRange(D.getIdentifierLoc()); 4690 return 0; 4691 } 4692 4693 bool isStatic = SC == SC_Static; 4694 4695 // [class.free]p1: 4696 // Any allocation function for a class T is a static member 4697 // (even if not explicitly declared static). 4698 if (Name.getCXXOverloadedOperator() == OO_New || 4699 Name.getCXXOverloadedOperator() == OO_Array_New) 4700 isStatic = true; 4701 4702 // [class.free]p6 Any deallocation function for a class X is a static member 4703 // (even if not explicitly declared static). 4704 if (Name.getCXXOverloadedOperator() == OO_Delete || 4705 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4706 isStatic = true; 4707 4708 IsVirtualOkay = !isStatic; 4709 4710 // This is a C++ method declaration. 4711 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4712 D.getSourceRange().getBegin(), NameInfo, R, 4713 TInfo, isStatic, SCAsWritten, isInline, 4714 isConstexpr, SourceLocation()); 4715 4716 } else { 4717 // Determine whether the function was written with a 4718 // prototype. This true when: 4719 // - we're in C++ (where every function has a prototype), 4720 return FunctionDecl::Create(SemaRef.Context, DC, 4721 D.getSourceRange().getBegin(), 4722 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4723 true/*HasPrototype*/, isConstexpr); 4724 } 4725} 4726 4727NamedDecl* 4728Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4729 TypeSourceInfo *TInfo, LookupResult &Previous, 4730 MultiTemplateParamsArg TemplateParamLists, 4731 bool &AddToScope) { 4732 QualType R = TInfo->getType(); 4733 4734 assert(R.getTypePtr()->isFunctionType()); 4735 4736 // TODO: consider using NameInfo for diagnostic. 4737 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4738 DeclarationName Name = NameInfo.getName(); 4739 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4740 4741 if (D.getDeclSpec().isThreadSpecified()) 4742 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4743 4744 // Do not allow returning a objc interface by-value. 4745 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4746 Diag(D.getIdentifierLoc(), 4747 diag::err_object_cannot_be_passed_returned_by_value) << 0 4748 << R->getAs<FunctionType>()->getResultType() 4749 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4750 4751 QualType T = R->getAs<FunctionType>()->getResultType(); 4752 T = Context.getObjCObjectPointerType(T); 4753 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4754 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4755 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4756 FPT->getNumArgs(), EPI); 4757 } 4758 else if (isa<FunctionNoProtoType>(R)) 4759 R = Context.getFunctionNoProtoType(T); 4760 } 4761 4762 bool isFriend = false; 4763 FunctionTemplateDecl *FunctionTemplate = 0; 4764 bool isExplicitSpecialization = false; 4765 bool isFunctionTemplateSpecialization = false; 4766 bool isDependentClassScopeExplicitSpecialization = false; 4767 bool isVirtualOkay = false; 4768 4769 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4770 isVirtualOkay); 4771 if (!NewFD) return 0; 4772 4773 if (getLangOptions().CPlusPlus) { 4774 bool isInline = D.getDeclSpec().isInlineSpecified(); 4775 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4776 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4777 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4778 isFriend = D.getDeclSpec().isFriendSpecified(); 4779 if (isFriend && !isInline && D.isFunctionDefinition()) { 4780 // C++ [class.friend]p5 4781 // A function can be defined in a friend declaration of a 4782 // class . . . . Such a function is implicitly inline. 4783 NewFD->setImplicitlyInline(); 4784 } 4785 4786 SetNestedNameSpecifier(NewFD, D); 4787 isExplicitSpecialization = false; 4788 isFunctionTemplateSpecialization = false; 4789 if (D.isInvalidType()) 4790 NewFD->setInvalidDecl(); 4791 4792 // Set the lexical context. If the declarator has a C++ 4793 // scope specifier, or is the object of a friend declaration, the 4794 // lexical context will be different from the semantic context. 4795 NewFD->setLexicalDeclContext(CurContext); 4796 4797 // Match up the template parameter lists with the scope specifier, then 4798 // determine whether we have a template or a template specialization. 4799 bool Invalid = false; 4800 if (TemplateParameterList *TemplateParams 4801 = MatchTemplateParametersToScopeSpecifier( 4802 D.getDeclSpec().getSourceRange().getBegin(), 4803 D.getIdentifierLoc(), 4804 D.getCXXScopeSpec(), 4805 TemplateParamLists.get(), 4806 TemplateParamLists.size(), 4807 isFriend, 4808 isExplicitSpecialization, 4809 Invalid)) { 4810 if (TemplateParams->size() > 0) { 4811 // This is a function template 4812 4813 // Check that we can declare a template here. 4814 if (CheckTemplateDeclScope(S, TemplateParams)) 4815 return 0; 4816 4817 // A destructor cannot be a template. 4818 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4819 Diag(NewFD->getLocation(), diag::err_destructor_template); 4820 return 0; 4821 } 4822 4823 // If we're adding a template to a dependent context, we may need to 4824 // rebuilding some of the types used within the template parameter list, 4825 // now that we know what the current instantiation is. 4826 if (DC->isDependentContext()) { 4827 ContextRAII SavedContext(*this, DC); 4828 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4829 Invalid = true; 4830 } 4831 4832 4833 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4834 NewFD->getLocation(), 4835 Name, TemplateParams, 4836 NewFD); 4837 FunctionTemplate->setLexicalDeclContext(CurContext); 4838 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4839 4840 // For source fidelity, store the other template param lists. 4841 if (TemplateParamLists.size() > 1) { 4842 NewFD->setTemplateParameterListsInfo(Context, 4843 TemplateParamLists.size() - 1, 4844 TemplateParamLists.release()); 4845 } 4846 } else { 4847 // This is a function template specialization. 4848 isFunctionTemplateSpecialization = true; 4849 // For source fidelity, store all the template param lists. 4850 NewFD->setTemplateParameterListsInfo(Context, 4851 TemplateParamLists.size(), 4852 TemplateParamLists.release()); 4853 4854 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4855 if (isFriend) { 4856 // We want to remove the "template<>", found here. 4857 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4858 4859 // If we remove the template<> and the name is not a 4860 // template-id, we're actually silently creating a problem: 4861 // the friend declaration will refer to an untemplated decl, 4862 // and clearly the user wants a template specialization. So 4863 // we need to insert '<>' after the name. 4864 SourceLocation InsertLoc; 4865 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4866 InsertLoc = D.getName().getSourceRange().getEnd(); 4867 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4868 } 4869 4870 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4871 << Name << RemoveRange 4872 << FixItHint::CreateRemoval(RemoveRange) 4873 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4874 } 4875 } 4876 } 4877 else { 4878 // All template param lists were matched against the scope specifier: 4879 // this is NOT (an explicit specialization of) a template. 4880 if (TemplateParamLists.size() > 0) 4881 // For source fidelity, store all the template param lists. 4882 NewFD->setTemplateParameterListsInfo(Context, 4883 TemplateParamLists.size(), 4884 TemplateParamLists.release()); 4885 } 4886 4887 if (Invalid) { 4888 NewFD->setInvalidDecl(); 4889 if (FunctionTemplate) 4890 FunctionTemplate->setInvalidDecl(); 4891 } 4892 4893 // C++ [dcl.fct.spec]p5: 4894 // The virtual specifier shall only be used in declarations of 4895 // nonstatic class member functions that appear within a 4896 // member-specification of a class declaration; see 10.3. 4897 // 4898 if (isVirtual && !NewFD->isInvalidDecl()) { 4899 if (!isVirtualOkay) { 4900 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4901 diag::err_virtual_non_function); 4902 } else if (!CurContext->isRecord()) { 4903 // 'virtual' was specified outside of the class. 4904 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4905 diag::err_virtual_out_of_class) 4906 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4907 } else if (NewFD->getDescribedFunctionTemplate()) { 4908 // C++ [temp.mem]p3: 4909 // A member function template shall not be virtual. 4910 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4911 diag::err_virtual_member_function_template) 4912 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4913 } else { 4914 // Okay: Add virtual to the method. 4915 NewFD->setVirtualAsWritten(true); 4916 } 4917 } 4918 4919 // C++ [dcl.fct.spec]p3: 4920 // The inline specifier shall not appear on a block scope function 4921 // declaration. 4922 if (isInline && !NewFD->isInvalidDecl()) { 4923 if (CurContext->isFunctionOrMethod()) { 4924 // 'inline' is not allowed on block scope function declaration. 4925 Diag(D.getDeclSpec().getInlineSpecLoc(), 4926 diag::err_inline_declaration_block_scope) << Name 4927 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4928 } 4929 } 4930 4931 // C++ [dcl.fct.spec]p6: 4932 // The explicit specifier shall be used only in the declaration of a 4933 // constructor or conversion function within its class definition; 4934 // see 12.3.1 and 12.3.2. 4935 if (isExplicit && !NewFD->isInvalidDecl()) { 4936 if (!CurContext->isRecord()) { 4937 // 'explicit' was specified outside of the class. 4938 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4939 diag::err_explicit_out_of_class) 4940 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4941 } else if (!isa<CXXConstructorDecl>(NewFD) && 4942 !isa<CXXConversionDecl>(NewFD)) { 4943 // 'explicit' was specified on a function that wasn't a constructor 4944 // or conversion function. 4945 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4946 diag::err_explicit_non_ctor_or_conv_function) 4947 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4948 } 4949 } 4950 4951 if (isConstexpr) { 4952 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4953 // are implicitly inline. 4954 NewFD->setImplicitlyInline(); 4955 4956 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4957 // be either constructors or to return a literal type. Therefore, 4958 // destructors cannot be declared constexpr. 4959 if (isa<CXXDestructorDecl>(NewFD)) 4960 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4961 } 4962 4963 // If __module_private__ was specified, mark the function accordingly. 4964 if (D.getDeclSpec().isModulePrivateSpecified()) { 4965 if (isFunctionTemplateSpecialization) { 4966 SourceLocation ModulePrivateLoc 4967 = D.getDeclSpec().getModulePrivateSpecLoc(); 4968 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4969 << 0 4970 << FixItHint::CreateRemoval(ModulePrivateLoc); 4971 } else { 4972 NewFD->setModulePrivate(); 4973 if (FunctionTemplate) 4974 FunctionTemplate->setModulePrivate(); 4975 } 4976 } 4977 4978 if (isFriend) { 4979 // For now, claim that the objects have no previous declaration. 4980 if (FunctionTemplate) { 4981 FunctionTemplate->setObjectOfFriendDecl(false); 4982 FunctionTemplate->setAccess(AS_public); 4983 } 4984 NewFD->setObjectOfFriendDecl(false); 4985 NewFD->setAccess(AS_public); 4986 } 4987 4988 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4989 D.isFunctionDefinition()) { 4990 // A method is implicitly inline if it's defined in its class 4991 // definition. 4992 NewFD->setImplicitlyInline(); 4993 } 4994 4995 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4996 !CurContext->isRecord()) { 4997 // C++ [class.static]p1: 4998 // A data or function member of a class may be declared static 4999 // in a class definition, in which case it is a static member of 5000 // the class. 5001 5002 // Complain about the 'static' specifier if it's on an out-of-line 5003 // member function definition. 5004 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5005 diag::err_static_out_of_line) 5006 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5007 } 5008 } 5009 5010 // Filter out previous declarations that don't match the scope. 5011 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5012 isExplicitSpecialization || 5013 isFunctionTemplateSpecialization); 5014 5015 // Handle GNU asm-label extension (encoded as an attribute). 5016 if (Expr *E = (Expr*) D.getAsmLabel()) { 5017 // The parser guarantees this is a string. 5018 StringLiteral *SE = cast<StringLiteral>(E); 5019 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5020 SE->getString())); 5021 } 5022 5023 // Copy the parameter declarations from the declarator D to the function 5024 // declaration NewFD, if they are available. First scavenge them into Params. 5025 SmallVector<ParmVarDecl*, 16> Params; 5026 if (D.isFunctionDeclarator()) { 5027 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5028 5029 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5030 // function that takes no arguments, not a function that takes a 5031 // single void argument. 5032 // We let through "const void" here because Sema::GetTypeForDeclarator 5033 // already checks for that case. 5034 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5035 FTI.ArgInfo[0].Param && 5036 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5037 // Empty arg list, don't push any params. 5038 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5039 5040 // In C++, the empty parameter-type-list must be spelled "void"; a 5041 // typedef of void is not permitted. 5042 if (getLangOptions().CPlusPlus && 5043 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5044 bool IsTypeAlias = false; 5045 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5046 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5047 else if (const TemplateSpecializationType *TST = 5048 Param->getType()->getAs<TemplateSpecializationType>()) 5049 IsTypeAlias = TST->isTypeAlias(); 5050 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5051 << IsTypeAlias; 5052 } 5053 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5054 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5055 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5056 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5057 Param->setDeclContext(NewFD); 5058 Params.push_back(Param); 5059 5060 if (Param->isInvalidDecl()) 5061 NewFD->setInvalidDecl(); 5062 } 5063 } 5064 5065 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5066 // When we're declaring a function with a typedef, typeof, etc as in the 5067 // following example, we'll need to synthesize (unnamed) 5068 // parameters for use in the declaration. 5069 // 5070 // @code 5071 // typedef void fn(int); 5072 // fn f; 5073 // @endcode 5074 5075 // Synthesize a parameter for each argument type. 5076 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5077 AE = FT->arg_type_end(); AI != AE; ++AI) { 5078 ParmVarDecl *Param = 5079 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5080 Param->setScopeInfo(0, Params.size()); 5081 Params.push_back(Param); 5082 } 5083 } else { 5084 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5085 "Should not need args for typedef of non-prototype fn"); 5086 } 5087 5088 // Finally, we know we have the right number of parameters, install them. 5089 NewFD->setParams(Params); 5090 5091 // Process the non-inheritable attributes on this declaration. 5092 ProcessDeclAttributes(S, NewFD, D, 5093 /*NonInheritable=*/true, /*Inheritable=*/false); 5094 5095 if (!getLangOptions().CPlusPlus) { 5096 // Perform semantic checking on the function declaration. 5097 bool isExplicitSpecialization=false; 5098 if (!NewFD->isInvalidDecl()) { 5099 if (NewFD->getResultType()->isVariablyModifiedType()) { 5100 // Functions returning a variably modified type violate C99 6.7.5.2p2 5101 // because all functions have linkage. 5102 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5103 NewFD->setInvalidDecl(); 5104 } else { 5105 if (NewFD->isMain()) 5106 CheckMain(NewFD, D.getDeclSpec()); 5107 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5108 isExplicitSpecialization)); 5109 } 5110 } 5111 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5112 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5113 "previous declaration set still overloaded"); 5114 } else { 5115 // If the declarator is a template-id, translate the parser's template 5116 // argument list into our AST format. 5117 bool HasExplicitTemplateArgs = false; 5118 TemplateArgumentListInfo TemplateArgs; 5119 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5120 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5121 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5122 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5123 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5124 TemplateId->getTemplateArgs(), 5125 TemplateId->NumArgs); 5126 translateTemplateArguments(TemplateArgsPtr, 5127 TemplateArgs); 5128 TemplateArgsPtr.release(); 5129 5130 HasExplicitTemplateArgs = true; 5131 5132 if (NewFD->isInvalidDecl()) { 5133 HasExplicitTemplateArgs = false; 5134 } else if (FunctionTemplate) { 5135 // Function template with explicit template arguments. 5136 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5137 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5138 5139 HasExplicitTemplateArgs = false; 5140 } else if (!isFunctionTemplateSpecialization && 5141 !D.getDeclSpec().isFriendSpecified()) { 5142 // We have encountered something that the user meant to be a 5143 // specialization (because it has explicitly-specified template 5144 // arguments) but that was not introduced with a "template<>" (or had 5145 // too few of them). 5146 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5147 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5148 << FixItHint::CreateInsertion( 5149 D.getDeclSpec().getSourceRange().getBegin(), 5150 "template<> "); 5151 isFunctionTemplateSpecialization = true; 5152 } else { 5153 // "friend void foo<>(int);" is an implicit specialization decl. 5154 isFunctionTemplateSpecialization = true; 5155 } 5156 } else if (isFriend && isFunctionTemplateSpecialization) { 5157 // This combination is only possible in a recovery case; the user 5158 // wrote something like: 5159 // template <> friend void foo(int); 5160 // which we're recovering from as if the user had written: 5161 // friend void foo<>(int); 5162 // Go ahead and fake up a template id. 5163 HasExplicitTemplateArgs = true; 5164 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5165 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5166 } 5167 5168 // If it's a friend (and only if it's a friend), it's possible 5169 // that either the specialized function type or the specialized 5170 // template is dependent, and therefore matching will fail. In 5171 // this case, don't check the specialization yet. 5172 bool InstantiationDependent = false; 5173 if (isFunctionTemplateSpecialization && isFriend && 5174 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5175 TemplateSpecializationType::anyDependentTemplateArguments( 5176 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5177 InstantiationDependent))) { 5178 assert(HasExplicitTemplateArgs && 5179 "friend function specialization without template args"); 5180 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5181 Previous)) 5182 NewFD->setInvalidDecl(); 5183 } else if (isFunctionTemplateSpecialization) { 5184 if (CurContext->isDependentContext() && CurContext->isRecord() 5185 && !isFriend) { 5186 isDependentClassScopeExplicitSpecialization = true; 5187 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5188 diag::ext_function_specialization_in_class : 5189 diag::err_function_specialization_in_class) 5190 << NewFD->getDeclName(); 5191 } else if (CheckFunctionTemplateSpecialization(NewFD, 5192 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5193 Previous)) 5194 NewFD->setInvalidDecl(); 5195 5196 // C++ [dcl.stc]p1: 5197 // A storage-class-specifier shall not be specified in an explicit 5198 // specialization (14.7.3) 5199 if (SC != SC_None) { 5200 if (SC != NewFD->getStorageClass()) 5201 Diag(NewFD->getLocation(), 5202 diag::err_explicit_specialization_inconsistent_storage_class) 5203 << SC 5204 << FixItHint::CreateRemoval( 5205 D.getDeclSpec().getStorageClassSpecLoc()); 5206 5207 else 5208 Diag(NewFD->getLocation(), 5209 diag::ext_explicit_specialization_storage_class) 5210 << FixItHint::CreateRemoval( 5211 D.getDeclSpec().getStorageClassSpecLoc()); 5212 } 5213 5214 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5215 if (CheckMemberSpecialization(NewFD, Previous)) 5216 NewFD->setInvalidDecl(); 5217 } 5218 5219 // Perform semantic checking on the function declaration. 5220 if (!isDependentClassScopeExplicitSpecialization) { 5221 if (NewFD->isInvalidDecl()) { 5222 // If this is a class member, mark the class invalid immediately. 5223 // This avoids some consistency errors later. 5224 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5225 methodDecl->getParent()->setInvalidDecl(); 5226 } else { 5227 if (NewFD->isMain()) 5228 CheckMain(NewFD, D.getDeclSpec()); 5229 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5230 isExplicitSpecialization)); 5231 } 5232 } 5233 5234 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5235 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5236 "previous declaration set still overloaded"); 5237 5238 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5239 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5240 NewFD->setInvalidDecl(); 5241 5242 NamedDecl *PrincipalDecl = (FunctionTemplate 5243 ? cast<NamedDecl>(FunctionTemplate) 5244 : NewFD); 5245 5246 if (isFriend && D.isRedeclaration()) { 5247 AccessSpecifier Access = AS_public; 5248 if (!NewFD->isInvalidDecl()) 5249 Access = NewFD->getPreviousDeclaration()->getAccess(); 5250 5251 NewFD->setAccess(Access); 5252 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5253 5254 PrincipalDecl->setObjectOfFriendDecl(true); 5255 } 5256 5257 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5258 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5259 PrincipalDecl->setNonMemberOperator(); 5260 5261 // If we have a function template, check the template parameter 5262 // list. This will check and merge default template arguments. 5263 if (FunctionTemplate) { 5264 FunctionTemplateDecl *PrevTemplate = 5265 FunctionTemplate->getPreviousDeclaration(); 5266 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5267 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5268 D.getDeclSpec().isFriendSpecified() 5269 ? (D.isFunctionDefinition() 5270 ? TPC_FriendFunctionTemplateDefinition 5271 : TPC_FriendFunctionTemplate) 5272 : (D.getCXXScopeSpec().isSet() && 5273 DC && DC->isRecord() && 5274 DC->isDependentContext()) 5275 ? TPC_ClassTemplateMember 5276 : TPC_FunctionTemplate); 5277 } 5278 5279 if (NewFD->isInvalidDecl()) { 5280 // Ignore all the rest of this. 5281 } else if (!D.isRedeclaration()) { 5282 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5283 AddToScope }; 5284 // Fake up an access specifier if it's supposed to be a class member. 5285 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5286 NewFD->setAccess(AS_public); 5287 5288 // Qualified decls generally require a previous declaration. 5289 if (D.getCXXScopeSpec().isSet()) { 5290 // ...with the major exception of templated-scope or 5291 // dependent-scope friend declarations. 5292 5293 // TODO: we currently also suppress this check in dependent 5294 // contexts because (1) the parameter depth will be off when 5295 // matching friend templates and (2) we might actually be 5296 // selecting a friend based on a dependent factor. But there 5297 // are situations where these conditions don't apply and we 5298 // can actually do this check immediately. 5299 if (isFriend && 5300 (TemplateParamLists.size() || 5301 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5302 CurContext->isDependentContext())) { 5303 // ignore these 5304 } else { 5305 // The user tried to provide an out-of-line definition for a 5306 // function that is a member of a class or namespace, but there 5307 // was no such member function declared (C++ [class.mfct]p2, 5308 // C++ [namespace.memdef]p2). For example: 5309 // 5310 // class X { 5311 // void f() const; 5312 // }; 5313 // 5314 // void X::f() { } // ill-formed 5315 // 5316 // Complain about this problem, and attempt to suggest close 5317 // matches (e.g., those that differ only in cv-qualifiers and 5318 // whether the parameter types are references). 5319 5320 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5321 NewFD, 5322 ExtraArgs)) { 5323 AddToScope = ExtraArgs.AddToScope; 5324 return Result; 5325 } 5326 } 5327 5328 // Unqualified local friend declarations are required to resolve 5329 // to something. 5330 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5331 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5332 NewFD, 5333 ExtraArgs)) { 5334 AddToScope = ExtraArgs.AddToScope; 5335 return Result; 5336 } 5337 } 5338 5339 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5340 !isFriend && !isFunctionTemplateSpecialization && 5341 !isExplicitSpecialization) { 5342 // An out-of-line member function declaration must also be a 5343 // definition (C++ [dcl.meaning]p1). 5344 // Note that this is not the case for explicit specializations of 5345 // function templates or member functions of class templates, per 5346 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5347 // extension for compatibility with old SWIG code which likes to 5348 // generate them. 5349 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5350 << D.getCXXScopeSpec().getRange(); 5351 } 5352 } 5353 5354 5355 // Handle attributes. We need to have merged decls when handling attributes 5356 // (for example to check for conflicts, etc). 5357 // FIXME: This needs to happen before we merge declarations. Then, 5358 // let attribute merging cope with attribute conflicts. 5359 ProcessDeclAttributes(S, NewFD, D, 5360 /*NonInheritable=*/false, /*Inheritable=*/true); 5361 5362 // attributes declared post-definition are currently ignored 5363 // FIXME: This should happen during attribute merging 5364 if (D.isRedeclaration() && Previous.isSingleResult()) { 5365 const FunctionDecl *Def; 5366 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5367 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5368 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5369 Diag(Def->getLocation(), diag::note_previous_definition); 5370 } 5371 } 5372 5373 AddKnownFunctionAttributes(NewFD); 5374 5375 if (NewFD->hasAttr<OverloadableAttr>() && 5376 !NewFD->getType()->getAs<FunctionProtoType>()) { 5377 Diag(NewFD->getLocation(), 5378 diag::err_attribute_overloadable_no_prototype) 5379 << NewFD; 5380 5381 // Turn this into a variadic function with no parameters. 5382 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5383 FunctionProtoType::ExtProtoInfo EPI; 5384 EPI.Variadic = true; 5385 EPI.ExtInfo = FT->getExtInfo(); 5386 5387 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5388 NewFD->setType(R); 5389 } 5390 5391 // If there's a #pragma GCC visibility in scope, and this isn't a class 5392 // member, set the visibility of this function. 5393 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5394 AddPushedVisibilityAttribute(NewFD); 5395 5396 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5397 // marking the function. 5398 AddCFAuditedAttribute(NewFD); 5399 5400 // If this is a locally-scoped extern C function, update the 5401 // map of such names. 5402 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5403 && !NewFD->isInvalidDecl()) 5404 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5405 5406 // Set this FunctionDecl's range up to the right paren. 5407 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5408 5409 if (getLangOptions().CPlusPlus) { 5410 if (FunctionTemplate) { 5411 if (NewFD->isInvalidDecl()) 5412 FunctionTemplate->setInvalidDecl(); 5413 return FunctionTemplate; 5414 } 5415 } 5416 5417 MarkUnusedFileScopedDecl(NewFD); 5418 5419 if (getLangOptions().CUDA) 5420 if (IdentifierInfo *II = NewFD->getIdentifier()) 5421 if (!NewFD->isInvalidDecl() && 5422 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5423 if (II->isStr("cudaConfigureCall")) { 5424 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5425 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5426 5427 Context.setcudaConfigureCallDecl(NewFD); 5428 } 5429 } 5430 5431 // Here we have an function template explicit specialization at class scope. 5432 // The actually specialization will be postponed to template instatiation 5433 // time via the ClassScopeFunctionSpecializationDecl node. 5434 if (isDependentClassScopeExplicitSpecialization) { 5435 ClassScopeFunctionSpecializationDecl *NewSpec = 5436 ClassScopeFunctionSpecializationDecl::Create( 5437 Context, CurContext, SourceLocation(), 5438 cast<CXXMethodDecl>(NewFD)); 5439 CurContext->addDecl(NewSpec); 5440 AddToScope = false; 5441 } 5442 5443 return NewFD; 5444} 5445 5446/// \brief Perform semantic checking of a new function declaration. 5447/// 5448/// Performs semantic analysis of the new function declaration 5449/// NewFD. This routine performs all semantic checking that does not 5450/// require the actual declarator involved in the declaration, and is 5451/// used both for the declaration of functions as they are parsed 5452/// (called via ActOnDeclarator) and for the declaration of functions 5453/// that have been instantiated via C++ template instantiation (called 5454/// via InstantiateDecl). 5455/// 5456/// \param IsExplicitSpecialiation whether this new function declaration is 5457/// an explicit specialization of the previous declaration. 5458/// 5459/// This sets NewFD->isInvalidDecl() to true if there was an error. 5460/// 5461/// Returns true if the function declaration is a redeclaration. 5462bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5463 LookupResult &Previous, 5464 bool IsExplicitSpecialization) { 5465 assert(!NewFD->getResultType()->isVariablyModifiedType() 5466 && "Variably modified return types are not handled here"); 5467 5468 // Check for a previous declaration of this name. 5469 if (Previous.empty() && NewFD->isExternC()) { 5470 // Since we did not find anything by this name and we're declaring 5471 // an extern "C" function, look for a non-visible extern "C" 5472 // declaration with the same name. 5473 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5474 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5475 if (Pos != LocallyScopedExternalDecls.end()) 5476 Previous.addDecl(Pos->second); 5477 } 5478 5479 bool Redeclaration = false; 5480 5481 // Merge or overload the declaration with an existing declaration of 5482 // the same name, if appropriate. 5483 if (!Previous.empty()) { 5484 // Determine whether NewFD is an overload of PrevDecl or 5485 // a declaration that requires merging. If it's an overload, 5486 // there's no more work to do here; we'll just add the new 5487 // function to the scope. 5488 5489 NamedDecl *OldDecl = 0; 5490 if (!AllowOverloadingOfFunction(Previous, Context)) { 5491 Redeclaration = true; 5492 OldDecl = Previous.getFoundDecl(); 5493 } else { 5494 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5495 /*NewIsUsingDecl*/ false)) { 5496 case Ovl_Match: 5497 Redeclaration = true; 5498 break; 5499 5500 case Ovl_NonFunction: 5501 Redeclaration = true; 5502 break; 5503 5504 case Ovl_Overload: 5505 Redeclaration = false; 5506 break; 5507 } 5508 5509 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5510 // If a function name is overloadable in C, then every function 5511 // with that name must be marked "overloadable". 5512 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5513 << Redeclaration << NewFD; 5514 NamedDecl *OverloadedDecl = 0; 5515 if (Redeclaration) 5516 OverloadedDecl = OldDecl; 5517 else if (!Previous.empty()) 5518 OverloadedDecl = Previous.getRepresentativeDecl(); 5519 if (OverloadedDecl) 5520 Diag(OverloadedDecl->getLocation(), 5521 diag::note_attribute_overloadable_prev_overload); 5522 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5523 Context)); 5524 } 5525 } 5526 5527 if (Redeclaration) { 5528 // NewFD and OldDecl represent declarations that need to be 5529 // merged. 5530 if (MergeFunctionDecl(NewFD, OldDecl)) { 5531 NewFD->setInvalidDecl(); 5532 return Redeclaration; 5533 } 5534 5535 Previous.clear(); 5536 Previous.addDecl(OldDecl); 5537 5538 if (FunctionTemplateDecl *OldTemplateDecl 5539 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5540 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5541 FunctionTemplateDecl *NewTemplateDecl 5542 = NewFD->getDescribedFunctionTemplate(); 5543 assert(NewTemplateDecl && "Template/non-template mismatch"); 5544 if (CXXMethodDecl *Method 5545 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5546 Method->setAccess(OldTemplateDecl->getAccess()); 5547 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5548 } 5549 5550 // If this is an explicit specialization of a member that is a function 5551 // template, mark it as a member specialization. 5552 if (IsExplicitSpecialization && 5553 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5554 NewTemplateDecl->setMemberSpecialization(); 5555 assert(OldTemplateDecl->isMemberSpecialization()); 5556 } 5557 5558 if (OldTemplateDecl->isModulePrivate()) 5559 NewTemplateDecl->setModulePrivate(); 5560 5561 } else { 5562 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5563 NewFD->setAccess(OldDecl->getAccess()); 5564 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5565 } 5566 } 5567 } 5568 5569 // Semantic checking for this function declaration (in isolation). 5570 if (getLangOptions().CPlusPlus) { 5571 // C++-specific checks. 5572 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5573 CheckConstructor(Constructor); 5574 } else if (CXXDestructorDecl *Destructor = 5575 dyn_cast<CXXDestructorDecl>(NewFD)) { 5576 CXXRecordDecl *Record = Destructor->getParent(); 5577 QualType ClassType = Context.getTypeDeclType(Record); 5578 5579 // FIXME: Shouldn't we be able to perform this check even when the class 5580 // type is dependent? Both gcc and edg can handle that. 5581 if (!ClassType->isDependentType()) { 5582 DeclarationName Name 5583 = Context.DeclarationNames.getCXXDestructorName( 5584 Context.getCanonicalType(ClassType)); 5585 if (NewFD->getDeclName() != Name) { 5586 Diag(NewFD->getLocation(), diag::err_destructor_name); 5587 NewFD->setInvalidDecl(); 5588 return Redeclaration; 5589 } 5590 } 5591 } else if (CXXConversionDecl *Conversion 5592 = dyn_cast<CXXConversionDecl>(NewFD)) { 5593 ActOnConversionDeclarator(Conversion); 5594 } 5595 5596 // Find any virtual functions that this function overrides. 5597 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5598 if (!Method->isFunctionTemplateSpecialization() && 5599 !Method->getDescribedFunctionTemplate()) { 5600 if (AddOverriddenMethods(Method->getParent(), Method)) { 5601 // If the function was marked as "static", we have a problem. 5602 if (NewFD->getStorageClass() == SC_Static) { 5603 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5604 << NewFD->getDeclName(); 5605 for (CXXMethodDecl::method_iterator 5606 Overridden = Method->begin_overridden_methods(), 5607 OverriddenEnd = Method->end_overridden_methods(); 5608 Overridden != OverriddenEnd; 5609 ++Overridden) { 5610 Diag((*Overridden)->getLocation(), 5611 diag::note_overridden_virtual_function); 5612 } 5613 } 5614 } 5615 } 5616 } 5617 5618 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5619 if (NewFD->isOverloadedOperator() && 5620 CheckOverloadedOperatorDeclaration(NewFD)) { 5621 NewFD->setInvalidDecl(); 5622 return Redeclaration; 5623 } 5624 5625 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5626 if (NewFD->getLiteralIdentifier() && 5627 CheckLiteralOperatorDeclaration(NewFD)) { 5628 NewFD->setInvalidDecl(); 5629 return Redeclaration; 5630 } 5631 5632 // In C++, check default arguments now that we have merged decls. Unless 5633 // the lexical context is the class, because in this case this is done 5634 // during delayed parsing anyway. 5635 if (!CurContext->isRecord()) 5636 CheckCXXDefaultArguments(NewFD); 5637 5638 // If this function declares a builtin function, check the type of this 5639 // declaration against the expected type for the builtin. 5640 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5641 ASTContext::GetBuiltinTypeError Error; 5642 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5643 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5644 // The type of this function differs from the type of the builtin, 5645 // so forget about the builtin entirely. 5646 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5647 } 5648 } 5649 } 5650 return Redeclaration; 5651} 5652 5653void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5654 // C++ [basic.start.main]p3: A program that declares main to be inline 5655 // or static is ill-formed. 5656 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5657 // shall not appear in a declaration of main. 5658 // static main is not an error under C99, but we should warn about it. 5659 if (FD->getStorageClass() == SC_Static) 5660 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5661 ? diag::err_static_main : diag::warn_static_main) 5662 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5663 if (FD->isInlineSpecified()) 5664 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5665 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5666 5667 QualType T = FD->getType(); 5668 assert(T->isFunctionType() && "function decl is not of function type"); 5669 const FunctionType* FT = T->getAs<FunctionType>(); 5670 5671 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5672 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5673 FD->setInvalidDecl(true); 5674 } 5675 5676 // Treat protoless main() as nullary. 5677 if (isa<FunctionNoProtoType>(FT)) return; 5678 5679 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5680 unsigned nparams = FTP->getNumArgs(); 5681 assert(FD->getNumParams() == nparams); 5682 5683 bool HasExtraParameters = (nparams > 3); 5684 5685 // Darwin passes an undocumented fourth argument of type char**. If 5686 // other platforms start sprouting these, the logic below will start 5687 // getting shifty. 5688 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5689 HasExtraParameters = false; 5690 5691 if (HasExtraParameters) { 5692 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5693 FD->setInvalidDecl(true); 5694 nparams = 3; 5695 } 5696 5697 // FIXME: a lot of the following diagnostics would be improved 5698 // if we had some location information about types. 5699 5700 QualType CharPP = 5701 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5702 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5703 5704 for (unsigned i = 0; i < nparams; ++i) { 5705 QualType AT = FTP->getArgType(i); 5706 5707 bool mismatch = true; 5708 5709 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5710 mismatch = false; 5711 else if (Expected[i] == CharPP) { 5712 // As an extension, the following forms are okay: 5713 // char const ** 5714 // char const * const * 5715 // char * const * 5716 5717 QualifierCollector qs; 5718 const PointerType* PT; 5719 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5720 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5721 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5722 qs.removeConst(); 5723 mismatch = !qs.empty(); 5724 } 5725 } 5726 5727 if (mismatch) { 5728 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5729 // TODO: suggest replacing given type with expected type 5730 FD->setInvalidDecl(true); 5731 } 5732 } 5733 5734 if (nparams == 1 && !FD->isInvalidDecl()) { 5735 Diag(FD->getLocation(), diag::warn_main_one_arg); 5736 } 5737 5738 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5739 Diag(FD->getLocation(), diag::err_main_template_decl); 5740 FD->setInvalidDecl(); 5741 } 5742} 5743 5744bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5745 // FIXME: Need strict checking. In C89, we need to check for 5746 // any assignment, increment, decrement, function-calls, or 5747 // commas outside of a sizeof. In C99, it's the same list, 5748 // except that the aforementioned are allowed in unevaluated 5749 // expressions. Everything else falls under the 5750 // "may accept other forms of constant expressions" exception. 5751 // (We never end up here for C++, so the constant expression 5752 // rules there don't matter.) 5753 if (Init->isConstantInitializer(Context, false)) 5754 return false; 5755 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5756 << Init->getSourceRange(); 5757 return true; 5758} 5759 5760namespace { 5761 // Visits an initialization expression to see if OrigDecl is evaluated in 5762 // its own initialization and throws a warning if it does. 5763 class SelfReferenceChecker 5764 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5765 Sema &S; 5766 Decl *OrigDecl; 5767 bool isRecordType; 5768 bool isPODType; 5769 5770 public: 5771 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5772 5773 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5774 S(S), OrigDecl(OrigDecl) { 5775 isPODType = false; 5776 isRecordType = false; 5777 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5778 isPODType = VD->getType().isPODType(S.Context); 5779 isRecordType = VD->getType()->isRecordType(); 5780 } 5781 } 5782 5783 void VisitExpr(Expr *E) { 5784 if (isa<ObjCMessageExpr>(*E)) return; 5785 if (isRecordType) { 5786 Expr *expr = E; 5787 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5788 ValueDecl *VD = ME->getMemberDecl(); 5789 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5790 expr = ME->getBase(); 5791 } 5792 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5793 HandleDeclRefExpr(DRE); 5794 return; 5795 } 5796 } 5797 Inherited::VisitExpr(E); 5798 } 5799 5800 void VisitMemberExpr(MemberExpr *E) { 5801 if (E->getType()->canDecayToPointerType()) return; 5802 if (isa<FieldDecl>(E->getMemberDecl())) 5803 if (DeclRefExpr *DRE 5804 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5805 HandleDeclRefExpr(DRE); 5806 return; 5807 } 5808 Inherited::VisitMemberExpr(E); 5809 } 5810 5811 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5812 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5813 (isRecordType && E->getCastKind() == CK_NoOp)) { 5814 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5815 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5816 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5817 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5818 HandleDeclRefExpr(DRE); 5819 return; 5820 } 5821 } 5822 Inherited::VisitImplicitCastExpr(E); 5823 } 5824 5825 void VisitUnaryOperator(UnaryOperator *E) { 5826 // For POD record types, addresses of its own members are well-defined. 5827 if (isRecordType && isPODType) return; 5828 Inherited::VisitUnaryOperator(E); 5829 } 5830 5831 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5832 Decl* ReferenceDecl = DRE->getDecl(); 5833 if (OrigDecl != ReferenceDecl) return; 5834 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5835 Sema::NotForRedeclaration); 5836 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5837 S.PDiag(diag::warn_uninit_self_reference_in_init) 5838 << Result.getLookupName() 5839 << OrigDecl->getLocation() 5840 << DRE->getSourceRange()); 5841 } 5842 }; 5843} 5844 5845/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5846void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5847 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5848} 5849 5850/// AddInitializerToDecl - Adds the initializer Init to the 5851/// declaration dcl. If DirectInit is true, this is C++ direct 5852/// initialization rather than copy initialization. 5853void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5854 bool DirectInit, bool TypeMayContainAuto) { 5855 // If there is no declaration, there was an error parsing it. Just ignore 5856 // the initializer. 5857 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5858 return; 5859 5860 // Check for self-references within variable initializers. 5861 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5862 // Variables declared within a function/method body are handled 5863 // by a dataflow analysis. 5864 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5865 CheckSelfReference(RealDecl, Init); 5866 } 5867 else { 5868 CheckSelfReference(RealDecl, Init); 5869 } 5870 5871 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5872 // With declarators parsed the way they are, the parser cannot 5873 // distinguish between a normal initializer and a pure-specifier. 5874 // Thus this grotesque test. 5875 IntegerLiteral *IL; 5876 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5877 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5878 CheckPureMethod(Method, Init->getSourceRange()); 5879 else { 5880 Diag(Method->getLocation(), diag::err_member_function_initialization) 5881 << Method->getDeclName() << Init->getSourceRange(); 5882 Method->setInvalidDecl(); 5883 } 5884 return; 5885 } 5886 5887 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5888 if (!VDecl) { 5889 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5890 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5891 RealDecl->setInvalidDecl(); 5892 return; 5893 } 5894 5895 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5896 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5897 TypeSourceInfo *DeducedType = 0; 5898 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5899 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5900 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5901 << Init->getSourceRange(); 5902 if (!DeducedType) { 5903 RealDecl->setInvalidDecl(); 5904 return; 5905 } 5906 VDecl->setTypeSourceInfo(DeducedType); 5907 VDecl->setType(DeducedType->getType()); 5908 5909 // In ARC, infer lifetime. 5910 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5911 VDecl->setInvalidDecl(); 5912 5913 // If this is a redeclaration, check that the type we just deduced matches 5914 // the previously declared type. 5915 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5916 MergeVarDeclTypes(VDecl, Old); 5917 } 5918 5919 5920 // A definition must end up with a complete type, which means it must be 5921 // complete with the restriction that an array type might be completed by the 5922 // initializer; note that later code assumes this restriction. 5923 QualType BaseDeclType = VDecl->getType(); 5924 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5925 BaseDeclType = Array->getElementType(); 5926 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5927 diag::err_typecheck_decl_incomplete_type)) { 5928 RealDecl->setInvalidDecl(); 5929 return; 5930 } 5931 5932 // The variable can not have an abstract class type. 5933 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5934 diag::err_abstract_type_in_decl, 5935 AbstractVariableType)) 5936 VDecl->setInvalidDecl(); 5937 5938 const VarDecl *Def; 5939 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5940 Diag(VDecl->getLocation(), diag::err_redefinition) 5941 << VDecl->getDeclName(); 5942 Diag(Def->getLocation(), diag::note_previous_definition); 5943 VDecl->setInvalidDecl(); 5944 return; 5945 } 5946 5947 const VarDecl* PrevInit = 0; 5948 if (getLangOptions().CPlusPlus) { 5949 // C++ [class.static.data]p4 5950 // If a static data member is of const integral or const 5951 // enumeration type, its declaration in the class definition can 5952 // specify a constant-initializer which shall be an integral 5953 // constant expression (5.19). In that case, the member can appear 5954 // in integral constant expressions. The member shall still be 5955 // defined in a namespace scope if it is used in the program and the 5956 // namespace scope definition shall not contain an initializer. 5957 // 5958 // We already performed a redefinition check above, but for static 5959 // data members we also need to check whether there was an in-class 5960 // declaration with an initializer. 5961 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5962 Diag(VDecl->getLocation(), diag::err_redefinition) 5963 << VDecl->getDeclName(); 5964 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5965 return; 5966 } 5967 5968 if (VDecl->hasLocalStorage()) 5969 getCurFunction()->setHasBranchProtectedScope(); 5970 5971 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5972 VDecl->setInvalidDecl(); 5973 return; 5974 } 5975 } 5976 5977 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5978 // a kernel function cannot be initialized." 5979 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5980 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5981 VDecl->setInvalidDecl(); 5982 return; 5983 } 5984 5985 // Capture the variable that is being initialized and the style of 5986 // initialization. 5987 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5988 5989 // FIXME: Poor source location information. 5990 InitializationKind Kind 5991 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5992 Init->getLocStart(), 5993 Init->getLocEnd()) 5994 : InitializationKind::CreateCopy(VDecl->getLocation(), 5995 Init->getLocStart()); 5996 5997 // Get the decls type and save a reference for later, since 5998 // CheckInitializerTypes may change it. 5999 QualType DclT = VDecl->getType(), SavT = DclT; 6000 if (VDecl->isLocalVarDecl()) { 6001 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 6002 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6003 VDecl->setInvalidDecl(); 6004 } else if (!VDecl->isInvalidDecl()) { 6005 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6006 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6007 MultiExprArg(*this, &Init, 1), 6008 &DclT); 6009 if (Result.isInvalid()) { 6010 VDecl->setInvalidDecl(); 6011 return; 6012 } 6013 6014 Init = Result.takeAs<Expr>(); 6015 6016 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6017 // Don't check invalid declarations to avoid emitting useless diagnostics. 6018 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6019 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6020 CheckForConstantInitializer(Init, DclT); 6021 } 6022 } 6023 } else if (VDecl->isStaticDataMember() && 6024 VDecl->getLexicalDeclContext()->isRecord()) { 6025 // This is an in-class initialization for a static data member, e.g., 6026 // 6027 // struct S { 6028 // static const int value = 17; 6029 // }; 6030 6031 // Try to perform the initialization regardless. 6032 if (!VDecl->isInvalidDecl()) { 6033 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6034 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6035 MultiExprArg(*this, &Init, 1), 6036 &DclT); 6037 if (Result.isInvalid()) { 6038 VDecl->setInvalidDecl(); 6039 return; 6040 } 6041 6042 Init = Result.takeAs<Expr>(); 6043 } 6044 6045 // C++ [class.mem]p4: 6046 // A member-declarator can contain a constant-initializer only 6047 // if it declares a static member (9.4) of const integral or 6048 // const enumeration type, see 9.4.2. 6049 // 6050 // C++0x [class.static.data]p3: 6051 // If a non-volatile const static data member is of integral or 6052 // enumeration type, its declaration in the class definition can 6053 // specify a brace-or-equal-initializer in which every initalizer-clause 6054 // that is an assignment-expression is a constant expression. A static 6055 // data member of literal type can be declared in the class definition 6056 // with the constexpr specifier; if so, its declaration shall specify a 6057 // brace-or-equal-initializer in which every initializer-clause that is 6058 // an assignment-expression is a constant expression. 6059 QualType T = VDecl->getType(); 6060 6061 // Do nothing on dependent types. 6062 if (T->isDependentType()) { 6063 6064 // Allow any 'static constexpr' members, whether or not they are of literal 6065 // type. We separately check that the initializer is a constant expression, 6066 // which implicitly requires the member to be of literal type. 6067 } else if (VDecl->isConstexpr()) { 6068 6069 // Require constness. 6070 } else if (!T.isConstQualified()) { 6071 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6072 << Init->getSourceRange(); 6073 VDecl->setInvalidDecl(); 6074 6075 // We allow integer constant expressions in all cases. 6076 } else if (T->isIntegralOrEnumerationType()) { 6077 // Check whether the expression is a constant expression. 6078 SourceLocation Loc; 6079 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6080 // In C++0x, a non-constexpr const static data member with an 6081 // in-class initializer cannot be volatile. 6082 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6083 else if (Init->isValueDependent()) 6084 ; // Nothing to check. 6085 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6086 ; // Ok, it's an ICE! 6087 else if (Init->isEvaluatable(Context)) { 6088 // If we can constant fold the initializer through heroics, accept it, 6089 // but report this as a use of an extension for -pedantic. 6090 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6091 << Init->getSourceRange(); 6092 } else { 6093 // Otherwise, this is some crazy unknown case. Report the issue at the 6094 // location provided by the isIntegerConstantExpr failed check. 6095 Diag(Loc, diag::err_in_class_initializer_non_constant) 6096 << Init->getSourceRange(); 6097 VDecl->setInvalidDecl(); 6098 } 6099 6100 // We allow floating-point constants as an extension. 6101 } else if (T->isFloatingType()) { // also permits complex, which is ok 6102 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6103 << T << Init->getSourceRange(); 6104 if (getLangOptions().CPlusPlus0x) 6105 Diag(VDecl->getLocation(), 6106 diag::note_in_class_initializer_float_type_constexpr) 6107 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6108 6109 if (!Init->isValueDependent() && 6110 !Init->isConstantInitializer(Context, false)) { 6111 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6112 << Init->getSourceRange(); 6113 VDecl->setInvalidDecl(); 6114 } 6115 6116 // Suggest adding 'constexpr' in C++0x for literal types. 6117 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6118 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6119 << T << Init->getSourceRange() 6120 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6121 VDecl->setConstexpr(true); 6122 6123 } else { 6124 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6125 << T << Init->getSourceRange(); 6126 VDecl->setInvalidDecl(); 6127 } 6128 } else if (VDecl->isFileVarDecl()) { 6129 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6130 (!getLangOptions().CPlusPlus || 6131 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6132 Diag(VDecl->getLocation(), diag::warn_extern_init); 6133 if (!VDecl->isInvalidDecl()) { 6134 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6135 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6136 MultiExprArg(*this, &Init, 1), 6137 &DclT); 6138 if (Result.isInvalid()) { 6139 VDecl->setInvalidDecl(); 6140 return; 6141 } 6142 6143 Init = Result.takeAs<Expr>(); 6144 } 6145 6146 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6147 // Don't check invalid declarations to avoid emitting useless diagnostics. 6148 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6149 // C99 6.7.8p4. All file scoped initializers need to be constant. 6150 CheckForConstantInitializer(Init, DclT); 6151 } 6152 } 6153 // If the type changed, it means we had an incomplete type that was 6154 // completed by the initializer. For example: 6155 // int ary[] = { 1, 3, 5 }; 6156 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6157 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6158 VDecl->setType(DclT); 6159 Init->setType(DclT); 6160 } 6161 6162 // Check any implicit conversions within the expression. 6163 CheckImplicitConversions(Init, VDecl->getLocation()); 6164 6165 if (!VDecl->isInvalidDecl()) 6166 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6167 6168 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6169 !VDecl->getType()->isDependentType() && 6170 !Init->isTypeDependent() && !Init->isValueDependent() && 6171 !Init->isConstantInitializer(Context, 6172 VDecl->getType()->isReferenceType())) { 6173 // FIXME: Improve this diagnostic to explain why the initializer is not 6174 // a constant expression. 6175 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6176 << VDecl << Init->getSourceRange(); 6177 } 6178 6179 Init = MaybeCreateExprWithCleanups(Init); 6180 // Attach the initializer to the decl. 6181 VDecl->setInit(Init); 6182 6183 CheckCompleteVariableDeclaration(VDecl); 6184} 6185 6186/// ActOnInitializerError - Given that there was an error parsing an 6187/// initializer for the given declaration, try to return to some form 6188/// of sanity. 6189void Sema::ActOnInitializerError(Decl *D) { 6190 // Our main concern here is re-establishing invariants like "a 6191 // variable's type is either dependent or complete". 6192 if (!D || D->isInvalidDecl()) return; 6193 6194 VarDecl *VD = dyn_cast<VarDecl>(D); 6195 if (!VD) return; 6196 6197 // Auto types are meaningless if we can't make sense of the initializer. 6198 if (ParsingInitForAutoVars.count(D)) { 6199 D->setInvalidDecl(); 6200 return; 6201 } 6202 6203 QualType Ty = VD->getType(); 6204 if (Ty->isDependentType()) return; 6205 6206 // Require a complete type. 6207 if (RequireCompleteType(VD->getLocation(), 6208 Context.getBaseElementType(Ty), 6209 diag::err_typecheck_decl_incomplete_type)) { 6210 VD->setInvalidDecl(); 6211 return; 6212 } 6213 6214 // Require an abstract type. 6215 if (RequireNonAbstractType(VD->getLocation(), Ty, 6216 diag::err_abstract_type_in_decl, 6217 AbstractVariableType)) { 6218 VD->setInvalidDecl(); 6219 return; 6220 } 6221 6222 // Don't bother complaining about constructors or destructors, 6223 // though. 6224} 6225 6226void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6227 bool TypeMayContainAuto) { 6228 // If there is no declaration, there was an error parsing it. Just ignore it. 6229 if (RealDecl == 0) 6230 return; 6231 6232 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6233 QualType Type = Var->getType(); 6234 6235 // C++0x [dcl.spec.auto]p3 6236 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6237 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6238 << Var->getDeclName() << Type; 6239 Var->setInvalidDecl(); 6240 return; 6241 } 6242 6243 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6244 // have an initializer. 6245 // C++0x [class.static.data]p3: A static data member can be declared with 6246 // the constexpr specifier; if so, its declaration shall specify 6247 // a brace-or-equal-initializer. 6248 // 6249 // A static data member's definition may inherit an initializer from an 6250 // in-class declaration. 6251 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6252 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6253 << Var->getDeclName(); 6254 Var->setInvalidDecl(); 6255 return; 6256 } 6257 6258 switch (Var->isThisDeclarationADefinition()) { 6259 case VarDecl::Definition: 6260 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6261 break; 6262 6263 // We have an out-of-line definition of a static data member 6264 // that has an in-class initializer, so we type-check this like 6265 // a declaration. 6266 // 6267 // Fall through 6268 6269 case VarDecl::DeclarationOnly: 6270 // It's only a declaration. 6271 6272 // Block scope. C99 6.7p7: If an identifier for an object is 6273 // declared with no linkage (C99 6.2.2p6), the type for the 6274 // object shall be complete. 6275 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6276 !Var->getLinkage() && !Var->isInvalidDecl() && 6277 RequireCompleteType(Var->getLocation(), Type, 6278 diag::err_typecheck_decl_incomplete_type)) 6279 Var->setInvalidDecl(); 6280 6281 // Make sure that the type is not abstract. 6282 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6283 RequireNonAbstractType(Var->getLocation(), Type, 6284 diag::err_abstract_type_in_decl, 6285 AbstractVariableType)) 6286 Var->setInvalidDecl(); 6287 return; 6288 6289 case VarDecl::TentativeDefinition: 6290 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6291 // object that has file scope without an initializer, and without a 6292 // storage-class specifier or with the storage-class specifier "static", 6293 // constitutes a tentative definition. Note: A tentative definition with 6294 // external linkage is valid (C99 6.2.2p5). 6295 if (!Var->isInvalidDecl()) { 6296 if (const IncompleteArrayType *ArrayT 6297 = Context.getAsIncompleteArrayType(Type)) { 6298 if (RequireCompleteType(Var->getLocation(), 6299 ArrayT->getElementType(), 6300 diag::err_illegal_decl_array_incomplete_type)) 6301 Var->setInvalidDecl(); 6302 } else if (Var->getStorageClass() == SC_Static) { 6303 // C99 6.9.2p3: If the declaration of an identifier for an object is 6304 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6305 // declared type shall not be an incomplete type. 6306 // NOTE: code such as the following 6307 // static struct s; 6308 // struct s { int a; }; 6309 // is accepted by gcc. Hence here we issue a warning instead of 6310 // an error and we do not invalidate the static declaration. 6311 // NOTE: to avoid multiple warnings, only check the first declaration. 6312 if (Var->getPreviousDeclaration() == 0) 6313 RequireCompleteType(Var->getLocation(), Type, 6314 diag::ext_typecheck_decl_incomplete_type); 6315 } 6316 } 6317 6318 // Record the tentative definition; we're done. 6319 if (!Var->isInvalidDecl()) 6320 TentativeDefinitions.push_back(Var); 6321 return; 6322 } 6323 6324 // Provide a specific diagnostic for uninitialized variable 6325 // definitions with incomplete array type. 6326 if (Type->isIncompleteArrayType()) { 6327 Diag(Var->getLocation(), 6328 diag::err_typecheck_incomplete_array_needs_initializer); 6329 Var->setInvalidDecl(); 6330 return; 6331 } 6332 6333 // Provide a specific diagnostic for uninitialized variable 6334 // definitions with reference type. 6335 if (Type->isReferenceType()) { 6336 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6337 << Var->getDeclName() 6338 << SourceRange(Var->getLocation(), Var->getLocation()); 6339 Var->setInvalidDecl(); 6340 return; 6341 } 6342 6343 // Do not attempt to type-check the default initializer for a 6344 // variable with dependent type. 6345 if (Type->isDependentType()) 6346 return; 6347 6348 if (Var->isInvalidDecl()) 6349 return; 6350 6351 if (RequireCompleteType(Var->getLocation(), 6352 Context.getBaseElementType(Type), 6353 diag::err_typecheck_decl_incomplete_type)) { 6354 Var->setInvalidDecl(); 6355 return; 6356 } 6357 6358 // The variable can not have an abstract class type. 6359 if (RequireNonAbstractType(Var->getLocation(), Type, 6360 diag::err_abstract_type_in_decl, 6361 AbstractVariableType)) { 6362 Var->setInvalidDecl(); 6363 return; 6364 } 6365 6366 // Check for jumps past the implicit initializer. C++0x 6367 // clarifies that this applies to a "variable with automatic 6368 // storage duration", not a "local variable". 6369 // C++11 [stmt.dcl]p3 6370 // A program that jumps from a point where a variable with automatic 6371 // storage duration is not in scope to a point where it is in scope is 6372 // ill-formed unless the variable has scalar type, class type with a 6373 // trivial default constructor and a trivial destructor, a cv-qualified 6374 // version of one of these types, or an array of one of the preceding 6375 // types and is declared without an initializer. 6376 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6377 if (const RecordType *Record 6378 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6379 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6380 // Mark the function for further checking even if the looser rules of 6381 // C++11 do not require such checks, so that we can diagnose 6382 // incompatibilities with C++98. 6383 if (!CXXRecord->isPOD()) 6384 getCurFunction()->setHasBranchProtectedScope(); 6385 } 6386 } 6387 6388 // C++03 [dcl.init]p9: 6389 // If no initializer is specified for an object, and the 6390 // object is of (possibly cv-qualified) non-POD class type (or 6391 // array thereof), the object shall be default-initialized; if 6392 // the object is of const-qualified type, the underlying class 6393 // type shall have a user-declared default 6394 // constructor. Otherwise, if no initializer is specified for 6395 // a non- static object, the object and its subobjects, if 6396 // any, have an indeterminate initial value); if the object 6397 // or any of its subobjects are of const-qualified type, the 6398 // program is ill-formed. 6399 // C++0x [dcl.init]p11: 6400 // If no initializer is specified for an object, the object is 6401 // default-initialized; [...]. 6402 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6403 InitializationKind Kind 6404 = InitializationKind::CreateDefault(Var->getLocation()); 6405 6406 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6407 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6408 MultiExprArg(*this, 0, 0)); 6409 if (Init.isInvalid()) 6410 Var->setInvalidDecl(); 6411 else if (Init.get()) 6412 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6413 6414 CheckCompleteVariableDeclaration(Var); 6415 } 6416} 6417 6418void Sema::ActOnCXXForRangeDecl(Decl *D) { 6419 VarDecl *VD = dyn_cast<VarDecl>(D); 6420 if (!VD) { 6421 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6422 D->setInvalidDecl(); 6423 return; 6424 } 6425 6426 VD->setCXXForRangeDecl(true); 6427 6428 // for-range-declaration cannot be given a storage class specifier. 6429 int Error = -1; 6430 switch (VD->getStorageClassAsWritten()) { 6431 case SC_None: 6432 break; 6433 case SC_Extern: 6434 Error = 0; 6435 break; 6436 case SC_Static: 6437 Error = 1; 6438 break; 6439 case SC_PrivateExtern: 6440 Error = 2; 6441 break; 6442 case SC_Auto: 6443 Error = 3; 6444 break; 6445 case SC_Register: 6446 Error = 4; 6447 break; 6448 case SC_OpenCLWorkGroupLocal: 6449 llvm_unreachable("Unexpected storage class"); 6450 } 6451 if (VD->isConstexpr()) 6452 Error = 5; 6453 if (Error != -1) { 6454 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6455 << VD->getDeclName() << Error; 6456 D->setInvalidDecl(); 6457 } 6458} 6459 6460void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6461 if (var->isInvalidDecl()) return; 6462 6463 // In ARC, don't allow jumps past the implicit initialization of a 6464 // local retaining variable. 6465 if (getLangOptions().ObjCAutoRefCount && 6466 var->hasLocalStorage()) { 6467 switch (var->getType().getObjCLifetime()) { 6468 case Qualifiers::OCL_None: 6469 case Qualifiers::OCL_ExplicitNone: 6470 case Qualifiers::OCL_Autoreleasing: 6471 break; 6472 6473 case Qualifiers::OCL_Weak: 6474 case Qualifiers::OCL_Strong: 6475 getCurFunction()->setHasBranchProtectedScope(); 6476 break; 6477 } 6478 } 6479 6480 // All the following checks are C++ only. 6481 if (!getLangOptions().CPlusPlus) return; 6482 6483 QualType baseType = Context.getBaseElementType(var->getType()); 6484 if (baseType->isDependentType()) return; 6485 6486 // __block variables might require us to capture a copy-initializer. 6487 if (var->hasAttr<BlocksAttr>()) { 6488 // It's currently invalid to ever have a __block variable with an 6489 // array type; should we diagnose that here? 6490 6491 // Regardless, we don't want to ignore array nesting when 6492 // constructing this copy. 6493 QualType type = var->getType(); 6494 6495 if (type->isStructureOrClassType()) { 6496 SourceLocation poi = var->getLocation(); 6497 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6498 ExprResult result = 6499 PerformCopyInitialization( 6500 InitializedEntity::InitializeBlock(poi, type, false), 6501 poi, Owned(varRef)); 6502 if (!result.isInvalid()) { 6503 result = MaybeCreateExprWithCleanups(result); 6504 Expr *init = result.takeAs<Expr>(); 6505 Context.setBlockVarCopyInits(var, init); 6506 } 6507 } 6508 } 6509 6510 // Check for global constructors. 6511 if (!var->getDeclContext()->isDependentContext() && 6512 var->hasGlobalStorage() && 6513 !var->isStaticLocal() && 6514 var->getInit() && 6515 !var->getInit()->isConstantInitializer(Context, 6516 baseType->isReferenceType())) 6517 Diag(var->getLocation(), diag::warn_global_constructor) 6518 << var->getInit()->getSourceRange(); 6519 6520 // Require the destructor. 6521 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6522 FinalizeVarWithDestructor(var, recordType); 6523} 6524 6525/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6526/// any semantic actions necessary after any initializer has been attached. 6527void 6528Sema::FinalizeDeclaration(Decl *ThisDecl) { 6529 // Note that we are no longer parsing the initializer for this declaration. 6530 ParsingInitForAutoVars.erase(ThisDecl); 6531} 6532 6533Sema::DeclGroupPtrTy 6534Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6535 Decl **Group, unsigned NumDecls) { 6536 SmallVector<Decl*, 8> Decls; 6537 6538 if (DS.isTypeSpecOwned()) 6539 Decls.push_back(DS.getRepAsDecl()); 6540 6541 for (unsigned i = 0; i != NumDecls; ++i) 6542 if (Decl *D = Group[i]) 6543 Decls.push_back(D); 6544 6545 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6546 DS.getTypeSpecType() == DeclSpec::TST_auto); 6547} 6548 6549/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6550/// group, performing any necessary semantic checking. 6551Sema::DeclGroupPtrTy 6552Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6553 bool TypeMayContainAuto) { 6554 // C++0x [dcl.spec.auto]p7: 6555 // If the type deduced for the template parameter U is not the same in each 6556 // deduction, the program is ill-formed. 6557 // FIXME: When initializer-list support is added, a distinction is needed 6558 // between the deduced type U and the deduced type which 'auto' stands for. 6559 // auto a = 0, b = { 1, 2, 3 }; 6560 // is legal because the deduced type U is 'int' in both cases. 6561 if (TypeMayContainAuto && NumDecls > 1) { 6562 QualType Deduced; 6563 CanQualType DeducedCanon; 6564 VarDecl *DeducedDecl = 0; 6565 for (unsigned i = 0; i != NumDecls; ++i) { 6566 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6567 AutoType *AT = D->getType()->getContainedAutoType(); 6568 // Don't reissue diagnostics when instantiating a template. 6569 if (AT && D->isInvalidDecl()) 6570 break; 6571 if (AT && AT->isDeduced()) { 6572 QualType U = AT->getDeducedType(); 6573 CanQualType UCanon = Context.getCanonicalType(U); 6574 if (Deduced.isNull()) { 6575 Deduced = U; 6576 DeducedCanon = UCanon; 6577 DeducedDecl = D; 6578 } else if (DeducedCanon != UCanon) { 6579 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6580 diag::err_auto_different_deductions) 6581 << Deduced << DeducedDecl->getDeclName() 6582 << U << D->getDeclName() 6583 << DeducedDecl->getInit()->getSourceRange() 6584 << D->getInit()->getSourceRange(); 6585 D->setInvalidDecl(); 6586 break; 6587 } 6588 } 6589 } 6590 } 6591 } 6592 6593 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6594} 6595 6596 6597/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6598/// to introduce parameters into function prototype scope. 6599Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6600 const DeclSpec &DS = D.getDeclSpec(); 6601 6602 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6603 // C++03 [dcl.stc]p2 also permits 'auto'. 6604 VarDecl::StorageClass StorageClass = SC_None; 6605 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6606 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6607 StorageClass = SC_Register; 6608 StorageClassAsWritten = SC_Register; 6609 } else if (getLangOptions().CPlusPlus && 6610 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6611 StorageClass = SC_Auto; 6612 StorageClassAsWritten = SC_Auto; 6613 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6614 Diag(DS.getStorageClassSpecLoc(), 6615 diag::err_invalid_storage_class_in_func_decl); 6616 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6617 } 6618 6619 if (D.getDeclSpec().isThreadSpecified()) 6620 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6621 if (D.getDeclSpec().isConstexprSpecified()) 6622 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6623 << 0; 6624 6625 DiagnoseFunctionSpecifiers(D); 6626 6627 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6628 QualType parmDeclType = TInfo->getType(); 6629 6630 if (getLangOptions().CPlusPlus) { 6631 // Check that there are no default arguments inside the type of this 6632 // parameter. 6633 CheckExtraCXXDefaultArguments(D); 6634 6635 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6636 if (D.getCXXScopeSpec().isSet()) { 6637 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6638 << D.getCXXScopeSpec().getRange(); 6639 D.getCXXScopeSpec().clear(); 6640 } 6641 } 6642 6643 // Ensure we have a valid name 6644 IdentifierInfo *II = 0; 6645 if (D.hasName()) { 6646 II = D.getIdentifier(); 6647 if (!II) { 6648 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6649 << GetNameForDeclarator(D).getName().getAsString(); 6650 D.setInvalidType(true); 6651 } 6652 } 6653 6654 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6655 if (II) { 6656 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6657 ForRedeclaration); 6658 LookupName(R, S); 6659 if (R.isSingleResult()) { 6660 NamedDecl *PrevDecl = R.getFoundDecl(); 6661 if (PrevDecl->isTemplateParameter()) { 6662 // Maybe we will complain about the shadowed template parameter. 6663 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6664 // Just pretend that we didn't see the previous declaration. 6665 PrevDecl = 0; 6666 } else if (S->isDeclScope(PrevDecl)) { 6667 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6668 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6669 6670 // Recover by removing the name 6671 II = 0; 6672 D.SetIdentifier(0, D.getIdentifierLoc()); 6673 D.setInvalidType(true); 6674 } 6675 } 6676 } 6677 6678 // Temporarily put parameter variables in the translation unit, not 6679 // the enclosing context. This prevents them from accidentally 6680 // looking like class members in C++. 6681 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6682 D.getSourceRange().getBegin(), 6683 D.getIdentifierLoc(), II, 6684 parmDeclType, TInfo, 6685 StorageClass, StorageClassAsWritten); 6686 6687 if (D.isInvalidType()) 6688 New->setInvalidDecl(); 6689 6690 assert(S->isFunctionPrototypeScope()); 6691 assert(S->getFunctionPrototypeDepth() >= 1); 6692 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6693 S->getNextFunctionPrototypeIndex()); 6694 6695 // Add the parameter declaration into this scope. 6696 S->AddDecl(New); 6697 if (II) 6698 IdResolver.AddDecl(New); 6699 6700 ProcessDeclAttributes(S, New, D); 6701 6702 if (D.getDeclSpec().isModulePrivateSpecified()) 6703 Diag(New->getLocation(), diag::err_module_private_local) 6704 << 1 << New->getDeclName() 6705 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6706 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6707 6708 if (New->hasAttr<BlocksAttr>()) { 6709 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6710 } 6711 return New; 6712} 6713 6714/// \brief Synthesizes a variable for a parameter arising from a 6715/// typedef. 6716ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6717 SourceLocation Loc, 6718 QualType T) { 6719 /* FIXME: setting StartLoc == Loc. 6720 Would it be worth to modify callers so as to provide proper source 6721 location for the unnamed parameters, embedding the parameter's type? */ 6722 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6723 T, Context.getTrivialTypeSourceInfo(T, Loc), 6724 SC_None, SC_None, 0); 6725 Param->setImplicit(); 6726 return Param; 6727} 6728 6729void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6730 ParmVarDecl * const *ParamEnd) { 6731 // Don't diagnose unused-parameter errors in template instantiations; we 6732 // will already have done so in the template itself. 6733 if (!ActiveTemplateInstantiations.empty()) 6734 return; 6735 6736 for (; Param != ParamEnd; ++Param) { 6737 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6738 !(*Param)->hasAttr<UnusedAttr>()) { 6739 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6740 << (*Param)->getDeclName(); 6741 } 6742 } 6743} 6744 6745void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6746 ParmVarDecl * const *ParamEnd, 6747 QualType ReturnTy, 6748 NamedDecl *D) { 6749 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6750 return; 6751 6752 // Warn if the return value is pass-by-value and larger than the specified 6753 // threshold. 6754 if (ReturnTy.isPODType(Context)) { 6755 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6756 if (Size > LangOpts.NumLargeByValueCopy) 6757 Diag(D->getLocation(), diag::warn_return_value_size) 6758 << D->getDeclName() << Size; 6759 } 6760 6761 // Warn if any parameter is pass-by-value and larger than the specified 6762 // threshold. 6763 for (; Param != ParamEnd; ++Param) { 6764 QualType T = (*Param)->getType(); 6765 if (!T.isPODType(Context)) 6766 continue; 6767 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6768 if (Size > LangOpts.NumLargeByValueCopy) 6769 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6770 << (*Param)->getDeclName() << Size; 6771 } 6772} 6773 6774ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6775 SourceLocation NameLoc, IdentifierInfo *Name, 6776 QualType T, TypeSourceInfo *TSInfo, 6777 VarDecl::StorageClass StorageClass, 6778 VarDecl::StorageClass StorageClassAsWritten) { 6779 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6780 if (getLangOptions().ObjCAutoRefCount && 6781 T.getObjCLifetime() == Qualifiers::OCL_None && 6782 T->isObjCLifetimeType()) { 6783 6784 Qualifiers::ObjCLifetime lifetime; 6785 6786 // Special cases for arrays: 6787 // - if it's const, use __unsafe_unretained 6788 // - otherwise, it's an error 6789 if (T->isArrayType()) { 6790 if (!T.isConstQualified()) { 6791 DelayedDiagnostics.add( 6792 sema::DelayedDiagnostic::makeForbiddenType( 6793 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6794 } 6795 lifetime = Qualifiers::OCL_ExplicitNone; 6796 } else { 6797 lifetime = T->getObjCARCImplicitLifetime(); 6798 } 6799 T = Context.getLifetimeQualifiedType(T, lifetime); 6800 } 6801 6802 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6803 Context.getAdjustedParameterType(T), 6804 TSInfo, 6805 StorageClass, StorageClassAsWritten, 6806 0); 6807 6808 // Parameters can not be abstract class types. 6809 // For record types, this is done by the AbstractClassUsageDiagnoser once 6810 // the class has been completely parsed. 6811 if (!CurContext->isRecord() && 6812 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6813 AbstractParamType)) 6814 New->setInvalidDecl(); 6815 6816 // Parameter declarators cannot be interface types. All ObjC objects are 6817 // passed by reference. 6818 if (T->isObjCObjectType()) { 6819 Diag(NameLoc, 6820 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6821 << FixItHint::CreateInsertion(NameLoc, "*"); 6822 T = Context.getObjCObjectPointerType(T); 6823 New->setType(T); 6824 } 6825 6826 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6827 // duration shall not be qualified by an address-space qualifier." 6828 // Since all parameters have automatic store duration, they can not have 6829 // an address space. 6830 if (T.getAddressSpace() != 0) { 6831 Diag(NameLoc, diag::err_arg_with_address_space); 6832 New->setInvalidDecl(); 6833 } 6834 6835 return New; 6836} 6837 6838void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6839 SourceLocation LocAfterDecls) { 6840 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6841 6842 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6843 // for a K&R function. 6844 if (!FTI.hasPrototype) { 6845 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6846 --i; 6847 if (FTI.ArgInfo[i].Param == 0) { 6848 llvm::SmallString<256> Code; 6849 llvm::raw_svector_ostream(Code) << " int " 6850 << FTI.ArgInfo[i].Ident->getName() 6851 << ";\n"; 6852 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6853 << FTI.ArgInfo[i].Ident 6854 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6855 6856 // Implicitly declare the argument as type 'int' for lack of a better 6857 // type. 6858 AttributeFactory attrs; 6859 DeclSpec DS(attrs); 6860 const char* PrevSpec; // unused 6861 unsigned DiagID; // unused 6862 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6863 PrevSpec, DiagID); 6864 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6865 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6866 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6867 } 6868 } 6869 } 6870} 6871 6872Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6873 Declarator &D) { 6874 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6875 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6876 Scope *ParentScope = FnBodyScope->getParent(); 6877 6878 D.setFunctionDefinition(true); 6879 Decl *DP = HandleDeclarator(ParentScope, D, 6880 MultiTemplateParamsArg(*this)); 6881 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6882} 6883 6884static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6885 // Don't warn about invalid declarations. 6886 if (FD->isInvalidDecl()) 6887 return false; 6888 6889 // Or declarations that aren't global. 6890 if (!FD->isGlobal()) 6891 return false; 6892 6893 // Don't warn about C++ member functions. 6894 if (isa<CXXMethodDecl>(FD)) 6895 return false; 6896 6897 // Don't warn about 'main'. 6898 if (FD->isMain()) 6899 return false; 6900 6901 // Don't warn about inline functions. 6902 if (FD->isInlined()) 6903 return false; 6904 6905 // Don't warn about function templates. 6906 if (FD->getDescribedFunctionTemplate()) 6907 return false; 6908 6909 // Don't warn about function template specializations. 6910 if (FD->isFunctionTemplateSpecialization()) 6911 return false; 6912 6913 bool MissingPrototype = true; 6914 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6915 Prev; Prev = Prev->getPreviousDeclaration()) { 6916 // Ignore any declarations that occur in function or method 6917 // scope, because they aren't visible from the header. 6918 if (Prev->getDeclContext()->isFunctionOrMethod()) 6919 continue; 6920 6921 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6922 break; 6923 } 6924 6925 return MissingPrototype; 6926} 6927 6928void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6929 // Don't complain if we're in GNU89 mode and the previous definition 6930 // was an extern inline function. 6931 const FunctionDecl *Definition; 6932 if (FD->isDefined(Definition) && 6933 !canRedefineFunction(Definition, getLangOptions())) { 6934 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6935 Definition->getStorageClass() == SC_Extern) 6936 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6937 << FD->getDeclName() << getLangOptions().CPlusPlus; 6938 else 6939 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6940 Diag(Definition->getLocation(), diag::note_previous_definition); 6941 } 6942} 6943 6944Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6945 // Clear the last template instantiation error context. 6946 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6947 6948 if (!D) 6949 return D; 6950 FunctionDecl *FD = 0; 6951 6952 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6953 FD = FunTmpl->getTemplatedDecl(); 6954 else 6955 FD = cast<FunctionDecl>(D); 6956 6957 // Enter a new function scope 6958 PushFunctionScope(); 6959 6960 // See if this is a redefinition. 6961 if (!FD->isLateTemplateParsed()) 6962 CheckForFunctionRedefinition(FD); 6963 6964 // Builtin functions cannot be defined. 6965 if (unsigned BuiltinID = FD->getBuiltinID()) { 6966 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6967 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6968 FD->setInvalidDecl(); 6969 } 6970 } 6971 6972 // The return type of a function definition must be complete 6973 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6974 QualType ResultType = FD->getResultType(); 6975 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6976 !FD->isInvalidDecl() && 6977 RequireCompleteType(FD->getLocation(), ResultType, 6978 diag::err_func_def_incomplete_result)) 6979 FD->setInvalidDecl(); 6980 6981 // GNU warning -Wmissing-prototypes: 6982 // Warn if a global function is defined without a previous 6983 // prototype declaration. This warning is issued even if the 6984 // definition itself provides a prototype. The aim is to detect 6985 // global functions that fail to be declared in header files. 6986 if (ShouldWarnAboutMissingPrototype(FD)) 6987 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6988 6989 if (FnBodyScope) 6990 PushDeclContext(FnBodyScope, FD); 6991 6992 // Check the validity of our function parameters 6993 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6994 /*CheckParameterNames=*/true); 6995 6996 // Introduce our parameters into the function scope 6997 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6998 ParmVarDecl *Param = FD->getParamDecl(p); 6999 Param->setOwningFunction(FD); 7000 7001 // If this has an identifier, add it to the scope stack. 7002 if (Param->getIdentifier() && FnBodyScope) { 7003 CheckShadow(FnBodyScope, Param); 7004 7005 PushOnScopeChains(Param, FnBodyScope); 7006 } 7007 } 7008 7009 // Checking attributes of current function definition 7010 // dllimport attribute. 7011 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7012 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7013 // dllimport attribute cannot be directly applied to definition. 7014 // Microsoft accepts dllimport for functions defined within class scope. 7015 if (!DA->isInherited() && 7016 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7017 Diag(FD->getLocation(), 7018 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7019 << "dllimport"; 7020 FD->setInvalidDecl(); 7021 return FD; 7022 } 7023 7024 // Visual C++ appears to not think this is an issue, so only issue 7025 // a warning when Microsoft extensions are disabled. 7026 if (!LangOpts.MicrosoftExt) { 7027 // If a symbol previously declared dllimport is later defined, the 7028 // attribute is ignored in subsequent references, and a warning is 7029 // emitted. 7030 Diag(FD->getLocation(), 7031 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7032 << FD->getName() << "dllimport"; 7033 } 7034 } 7035 return FD; 7036} 7037 7038/// \brief Given the set of return statements within a function body, 7039/// compute the variables that are subject to the named return value 7040/// optimization. 7041/// 7042/// Each of the variables that is subject to the named return value 7043/// optimization will be marked as NRVO variables in the AST, and any 7044/// return statement that has a marked NRVO variable as its NRVO candidate can 7045/// use the named return value optimization. 7046/// 7047/// This function applies a very simplistic algorithm for NRVO: if every return 7048/// statement in the function has the same NRVO candidate, that candidate is 7049/// the NRVO variable. 7050/// 7051/// FIXME: Employ a smarter algorithm that accounts for multiple return 7052/// statements and the lifetimes of the NRVO candidates. We should be able to 7053/// find a maximal set of NRVO variables. 7054void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7055 ReturnStmt **Returns = Scope->Returns.data(); 7056 7057 const VarDecl *NRVOCandidate = 0; 7058 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7059 if (!Returns[I]->getNRVOCandidate()) 7060 return; 7061 7062 if (!NRVOCandidate) 7063 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7064 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7065 return; 7066 } 7067 7068 if (NRVOCandidate) 7069 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7070} 7071 7072Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7073 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7074} 7075 7076Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7077 bool IsInstantiation) { 7078 FunctionDecl *FD = 0; 7079 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7080 if (FunTmpl) 7081 FD = FunTmpl->getTemplatedDecl(); 7082 else 7083 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7084 7085 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7086 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7087 7088 if (FD) { 7089 FD->setBody(Body); 7090 if (FD->isMain()) { 7091 // C and C++ allow for main to automagically return 0. 7092 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7093 FD->setHasImplicitReturnZero(true); 7094 WP.disableCheckFallThrough(); 7095 } else if (FD->hasAttr<NakedAttr>()) { 7096 // If the function is marked 'naked', don't complain about missing return 7097 // statements. 7098 WP.disableCheckFallThrough(); 7099 } 7100 7101 // MSVC permits the use of pure specifier (=0) on function definition, 7102 // defined at class scope, warn about this non standard construct. 7103 if (getLangOptions().MicrosoftExt && FD->isPure()) 7104 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7105 7106 if (!FD->isInvalidDecl()) { 7107 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7108 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7109 FD->getResultType(), FD); 7110 7111 // If this is a constructor, we need a vtable. 7112 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7113 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7114 7115 computeNRVO(Body, getCurFunction()); 7116 } 7117 7118 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7119 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7120 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7121 MD->setBody(Body); 7122 if (Body) 7123 MD->setEndLoc(Body->getLocEnd()); 7124 if (!MD->isInvalidDecl()) { 7125 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7126 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7127 MD->getResultType(), MD); 7128 7129 if (Body) 7130 computeNRVO(Body, getCurFunction()); 7131 } 7132 if (ObjCShouldCallSuperDealloc) { 7133 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7134 ObjCShouldCallSuperDealloc = false; 7135 } 7136 if (ObjCShouldCallSuperFinalize) { 7137 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7138 ObjCShouldCallSuperFinalize = false; 7139 } 7140 } else { 7141 return 0; 7142 } 7143 7144 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7145 "ObjC methods, which should have been handled in the block above."); 7146 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7147 "ObjC methods, which should have been handled in the block above."); 7148 7149 // Verify and clean out per-function state. 7150 if (Body) { 7151 // C++ constructors that have function-try-blocks can't have return 7152 // statements in the handlers of that block. (C++ [except.handle]p14) 7153 // Verify this. 7154 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7155 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7156 7157 // Verify that gotos and switch cases don't jump into scopes illegally. 7158 if (getCurFunction()->NeedsScopeChecking() && 7159 !dcl->isInvalidDecl() && 7160 !hasAnyUnrecoverableErrorsInThisFunction()) 7161 DiagnoseInvalidJumps(Body); 7162 7163 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7164 if (!Destructor->getParent()->isDependentType()) 7165 CheckDestructor(Destructor); 7166 7167 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7168 Destructor->getParent()); 7169 } 7170 7171 // If any errors have occurred, clear out any temporaries that may have 7172 // been leftover. This ensures that these temporaries won't be picked up for 7173 // deletion in some later function. 7174 if (PP.getDiagnostics().hasErrorOccurred() || 7175 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7176 ExprTemporaries.clear(); 7177 ExprNeedsCleanups = false; 7178 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7179 // Since the body is valid, issue any analysis-based warnings that are 7180 // enabled. 7181 ActivePolicy = &WP; 7182 } 7183 7184 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7185 !CheckConstexprFunctionBody(FD, Body)) 7186 FD->setInvalidDecl(); 7187 7188 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7189 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7190 } 7191 7192 if (!IsInstantiation) 7193 PopDeclContext(); 7194 7195 PopFunctionOrBlockScope(ActivePolicy, dcl); 7196 7197 // If any errors have occurred, clear out any temporaries that may have 7198 // been leftover. This ensures that these temporaries won't be picked up for 7199 // deletion in some later function. 7200 if (getDiagnostics().hasErrorOccurred()) { 7201 ExprTemporaries.clear(); 7202 ExprNeedsCleanups = false; 7203 } 7204 7205 return dcl; 7206} 7207 7208 7209/// When we finish delayed parsing of an attribute, we must attach it to the 7210/// relevant Decl. 7211void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7212 ParsedAttributes &Attrs) { 7213 ProcessDeclAttributeList(S, D, Attrs.getList()); 7214} 7215 7216 7217/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7218/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7219NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7220 IdentifierInfo &II, Scope *S) { 7221 // Before we produce a declaration for an implicitly defined 7222 // function, see whether there was a locally-scoped declaration of 7223 // this name as a function or variable. If so, use that 7224 // (non-visible) declaration, and complain about it. 7225 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7226 = findLocallyScopedExternalDecl(&II); 7227 if (Pos != LocallyScopedExternalDecls.end()) { 7228 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7229 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7230 return Pos->second; 7231 } 7232 7233 // Extension in C99. Legal in C90, but warn about it. 7234 if (II.getName().startswith("__builtin_")) 7235 Diag(Loc, diag::warn_builtin_unknown) << &II; 7236 else if (getLangOptions().C99) 7237 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7238 else 7239 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7240 7241 // Set a Declarator for the implicit definition: int foo(); 7242 const char *Dummy; 7243 AttributeFactory attrFactory; 7244 DeclSpec DS(attrFactory); 7245 unsigned DiagID; 7246 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7247 (void)Error; // Silence warning. 7248 assert(!Error && "Error setting up implicit decl!"); 7249 Declarator D(DS, Declarator::BlockContext); 7250 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7251 0, 0, true, SourceLocation(), 7252 SourceLocation(), SourceLocation(), 7253 SourceLocation(), 7254 EST_None, SourceLocation(), 7255 0, 0, 0, 0, Loc, Loc, D), 7256 DS.getAttributes(), 7257 SourceLocation()); 7258 D.SetIdentifier(&II, Loc); 7259 7260 // Insert this function into translation-unit scope. 7261 7262 DeclContext *PrevDC = CurContext; 7263 CurContext = Context.getTranslationUnitDecl(); 7264 7265 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7266 FD->setImplicit(); 7267 7268 CurContext = PrevDC; 7269 7270 AddKnownFunctionAttributes(FD); 7271 7272 return FD; 7273} 7274 7275/// \brief Adds any function attributes that we know a priori based on 7276/// the declaration of this function. 7277/// 7278/// These attributes can apply both to implicitly-declared builtins 7279/// (like __builtin___printf_chk) or to library-declared functions 7280/// like NSLog or printf. 7281/// 7282/// We need to check for duplicate attributes both here and where user-written 7283/// attributes are applied to declarations. 7284void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7285 if (FD->isInvalidDecl()) 7286 return; 7287 7288 // If this is a built-in function, map its builtin attributes to 7289 // actual attributes. 7290 if (unsigned BuiltinID = FD->getBuiltinID()) { 7291 // Handle printf-formatting attributes. 7292 unsigned FormatIdx; 7293 bool HasVAListArg; 7294 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7295 if (!FD->getAttr<FormatAttr>()) 7296 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7297 "printf", FormatIdx+1, 7298 HasVAListArg ? 0 : FormatIdx+2)); 7299 } 7300 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7301 HasVAListArg)) { 7302 if (!FD->getAttr<FormatAttr>()) 7303 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7304 "scanf", FormatIdx+1, 7305 HasVAListArg ? 0 : FormatIdx+2)); 7306 } 7307 7308 // Mark const if we don't care about errno and that is the only 7309 // thing preventing the function from being const. This allows 7310 // IRgen to use LLVM intrinsics for such functions. 7311 if (!getLangOptions().MathErrno && 7312 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7313 if (!FD->getAttr<ConstAttr>()) 7314 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7315 } 7316 7317 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7318 !FD->getAttr<ReturnsTwiceAttr>()) 7319 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7320 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7321 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7322 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7323 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7324 } 7325 7326 IdentifierInfo *Name = FD->getIdentifier(); 7327 if (!Name) 7328 return; 7329 if ((!getLangOptions().CPlusPlus && 7330 FD->getDeclContext()->isTranslationUnit()) || 7331 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7332 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7333 LinkageSpecDecl::lang_c)) { 7334 // Okay: this could be a libc/libm/Objective-C function we know 7335 // about. 7336 } else 7337 return; 7338 7339 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7340 // FIXME: NSLog and NSLogv should be target specific 7341 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7342 // FIXME: We known better than our headers. 7343 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7344 } else 7345 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7346 "printf", 1, 7347 Name->isStr("NSLogv") ? 0 : 2)); 7348 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7349 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7350 // target-specific builtins, perhaps? 7351 if (!FD->getAttr<FormatAttr>()) 7352 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7353 "printf", 2, 7354 Name->isStr("vasprintf") ? 0 : 3)); 7355 } 7356} 7357 7358TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7359 TypeSourceInfo *TInfo) { 7360 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7361 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7362 7363 if (!TInfo) { 7364 assert(D.isInvalidType() && "no declarator info for valid type"); 7365 TInfo = Context.getTrivialTypeSourceInfo(T); 7366 } 7367 7368 // Scope manipulation handled by caller. 7369 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7370 D.getSourceRange().getBegin(), 7371 D.getIdentifierLoc(), 7372 D.getIdentifier(), 7373 TInfo); 7374 7375 // Bail out immediately if we have an invalid declaration. 7376 if (D.isInvalidType()) { 7377 NewTD->setInvalidDecl(); 7378 return NewTD; 7379 } 7380 7381 if (D.getDeclSpec().isModulePrivateSpecified()) { 7382 if (CurContext->isFunctionOrMethod()) 7383 Diag(NewTD->getLocation(), diag::err_module_private_local) 7384 << 2 << NewTD->getDeclName() 7385 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7386 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7387 else 7388 NewTD->setModulePrivate(); 7389 } 7390 7391 // C++ [dcl.typedef]p8: 7392 // If the typedef declaration defines an unnamed class (or 7393 // enum), the first typedef-name declared by the declaration 7394 // to be that class type (or enum type) is used to denote the 7395 // class type (or enum type) for linkage purposes only. 7396 // We need to check whether the type was declared in the declaration. 7397 switch (D.getDeclSpec().getTypeSpecType()) { 7398 case TST_enum: 7399 case TST_struct: 7400 case TST_union: 7401 case TST_class: { 7402 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7403 7404 // Do nothing if the tag is not anonymous or already has an 7405 // associated typedef (from an earlier typedef in this decl group). 7406 if (tagFromDeclSpec->getIdentifier()) break; 7407 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7408 7409 // A well-formed anonymous tag must always be a TUK_Definition. 7410 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7411 7412 // The type must match the tag exactly; no qualifiers allowed. 7413 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7414 break; 7415 7416 // Otherwise, set this is the anon-decl typedef for the tag. 7417 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7418 break; 7419 } 7420 7421 default: 7422 break; 7423 } 7424 7425 return NewTD; 7426} 7427 7428 7429/// \brief Determine whether a tag with a given kind is acceptable 7430/// as a redeclaration of the given tag declaration. 7431/// 7432/// \returns true if the new tag kind is acceptable, false otherwise. 7433bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7434 TagTypeKind NewTag, bool isDefinition, 7435 SourceLocation NewTagLoc, 7436 const IdentifierInfo &Name) { 7437 // C++ [dcl.type.elab]p3: 7438 // The class-key or enum keyword present in the 7439 // elaborated-type-specifier shall agree in kind with the 7440 // declaration to which the name in the elaborated-type-specifier 7441 // refers. This rule also applies to the form of 7442 // elaborated-type-specifier that declares a class-name or 7443 // friend class since it can be construed as referring to the 7444 // definition of the class. Thus, in any 7445 // elaborated-type-specifier, the enum keyword shall be used to 7446 // refer to an enumeration (7.2), the union class-key shall be 7447 // used to refer to a union (clause 9), and either the class or 7448 // struct class-key shall be used to refer to a class (clause 9) 7449 // declared using the class or struct class-key. 7450 TagTypeKind OldTag = Previous->getTagKind(); 7451 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7452 if (OldTag == NewTag) 7453 return true; 7454 7455 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7456 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7457 // Warn about the struct/class tag mismatch. 7458 bool isTemplate = false; 7459 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7460 isTemplate = Record->getDescribedClassTemplate(); 7461 7462 if (!ActiveTemplateInstantiations.empty()) { 7463 // In a template instantiation, do not offer fix-its for tag mismatches 7464 // since they usually mess up the template instead of fixing the problem. 7465 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7466 << (NewTag == TTK_Class) << isTemplate << &Name; 7467 return true; 7468 } 7469 7470 if (isDefinition) { 7471 // On definitions, check previous tags and issue a fix-it for each 7472 // one that doesn't match the current tag. 7473 if (Previous->getDefinition()) { 7474 // Don't suggest fix-its for redefinitions. 7475 return true; 7476 } 7477 7478 bool previousMismatch = false; 7479 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7480 E(Previous->redecls_end()); I != E; ++I) { 7481 if (I->getTagKind() != NewTag) { 7482 if (!previousMismatch) { 7483 previousMismatch = true; 7484 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7485 << (NewTag == TTK_Class) << isTemplate << &Name; 7486 } 7487 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7488 << (NewTag == TTK_Class) 7489 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7490 NewTag == TTK_Class? 7491 "class" : "struct"); 7492 } 7493 } 7494 return true; 7495 } 7496 7497 // Check for a previous definition. If current tag and definition 7498 // are same type, do nothing. If no definition, but disagree with 7499 // with previous tag type, give a warning, but no fix-it. 7500 const TagDecl *Redecl = Previous->getDefinition() ? 7501 Previous->getDefinition() : Previous; 7502 if (Redecl->getTagKind() == NewTag) { 7503 return true; 7504 } 7505 7506 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7507 << (NewTag == TTK_Class) 7508 << isTemplate << &Name; 7509 Diag(Redecl->getLocation(), diag::note_previous_use); 7510 7511 // If there is a previous defintion, suggest a fix-it. 7512 if (Previous->getDefinition()) { 7513 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7514 << (Redecl->getTagKind() == TTK_Class) 7515 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7516 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7517 } 7518 7519 return true; 7520 } 7521 return false; 7522} 7523 7524/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7525/// former case, Name will be non-null. In the later case, Name will be null. 7526/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7527/// reference/declaration/definition of a tag. 7528Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7529 SourceLocation KWLoc, CXXScopeSpec &SS, 7530 IdentifierInfo *Name, SourceLocation NameLoc, 7531 AttributeList *Attr, AccessSpecifier AS, 7532 SourceLocation ModulePrivateLoc, 7533 MultiTemplateParamsArg TemplateParameterLists, 7534 bool &OwnedDecl, bool &IsDependent, 7535 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7536 TypeResult UnderlyingType) { 7537 // If this is not a definition, it must have a name. 7538 assert((Name != 0 || TUK == TUK_Definition) && 7539 "Nameless record must be a definition!"); 7540 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7541 7542 OwnedDecl = false; 7543 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7544 7545 // FIXME: Check explicit specializations more carefully. 7546 bool isExplicitSpecialization = false; 7547 bool Invalid = false; 7548 7549 // We only need to do this matching if we have template parameters 7550 // or a scope specifier, which also conveniently avoids this work 7551 // for non-C++ cases. 7552 if (TemplateParameterLists.size() > 0 || 7553 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7554 if (TemplateParameterList *TemplateParams 7555 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7556 TemplateParameterLists.get(), 7557 TemplateParameterLists.size(), 7558 TUK == TUK_Friend, 7559 isExplicitSpecialization, 7560 Invalid)) { 7561 if (TemplateParams->size() > 0) { 7562 // This is a declaration or definition of a class template (which may 7563 // be a member of another template). 7564 7565 if (Invalid) 7566 return 0; 7567 7568 OwnedDecl = false; 7569 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7570 SS, Name, NameLoc, Attr, 7571 TemplateParams, AS, 7572 ModulePrivateLoc, 7573 TemplateParameterLists.size() - 1, 7574 (TemplateParameterList**) TemplateParameterLists.release()); 7575 return Result.get(); 7576 } else { 7577 // The "template<>" header is extraneous. 7578 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7579 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7580 isExplicitSpecialization = true; 7581 } 7582 } 7583 } 7584 7585 // Figure out the underlying type if this a enum declaration. We need to do 7586 // this early, because it's needed to detect if this is an incompatible 7587 // redeclaration. 7588 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7589 7590 if (Kind == TTK_Enum) { 7591 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7592 // No underlying type explicitly specified, or we failed to parse the 7593 // type, default to int. 7594 EnumUnderlying = Context.IntTy.getTypePtr(); 7595 else if (UnderlyingType.get()) { 7596 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7597 // integral type; any cv-qualification is ignored. 7598 TypeSourceInfo *TI = 0; 7599 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7600 EnumUnderlying = TI; 7601 7602 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7603 7604 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7605 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7606 << T; 7607 // Recover by falling back to int. 7608 EnumUnderlying = Context.IntTy.getTypePtr(); 7609 } 7610 7611 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7612 UPPC_FixedUnderlyingType)) 7613 EnumUnderlying = Context.IntTy.getTypePtr(); 7614 7615 } else if (getLangOptions().MicrosoftExt) 7616 // Microsoft enums are always of int type. 7617 EnumUnderlying = Context.IntTy.getTypePtr(); 7618 } 7619 7620 DeclContext *SearchDC = CurContext; 7621 DeclContext *DC = CurContext; 7622 bool isStdBadAlloc = false; 7623 7624 RedeclarationKind Redecl = ForRedeclaration; 7625 if (TUK == TUK_Friend || TUK == TUK_Reference) 7626 Redecl = NotForRedeclaration; 7627 7628 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7629 7630 if (Name && SS.isNotEmpty()) { 7631 // We have a nested-name tag ('struct foo::bar'). 7632 7633 // Check for invalid 'foo::'. 7634 if (SS.isInvalid()) { 7635 Name = 0; 7636 goto CreateNewDecl; 7637 } 7638 7639 // If this is a friend or a reference to a class in a dependent 7640 // context, don't try to make a decl for it. 7641 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7642 DC = computeDeclContext(SS, false); 7643 if (!DC) { 7644 IsDependent = true; 7645 return 0; 7646 } 7647 } else { 7648 DC = computeDeclContext(SS, true); 7649 if (!DC) { 7650 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7651 << SS.getRange(); 7652 return 0; 7653 } 7654 } 7655 7656 if (RequireCompleteDeclContext(SS, DC)) 7657 return 0; 7658 7659 SearchDC = DC; 7660 // Look-up name inside 'foo::'. 7661 LookupQualifiedName(Previous, DC); 7662 7663 if (Previous.isAmbiguous()) 7664 return 0; 7665 7666 if (Previous.empty()) { 7667 // Name lookup did not find anything. However, if the 7668 // nested-name-specifier refers to the current instantiation, 7669 // and that current instantiation has any dependent base 7670 // classes, we might find something at instantiation time: treat 7671 // this as a dependent elaborated-type-specifier. 7672 // But this only makes any sense for reference-like lookups. 7673 if (Previous.wasNotFoundInCurrentInstantiation() && 7674 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7675 IsDependent = true; 7676 return 0; 7677 } 7678 7679 // A tag 'foo::bar' must already exist. 7680 Diag(NameLoc, diag::err_not_tag_in_scope) 7681 << Kind << Name << DC << SS.getRange(); 7682 Name = 0; 7683 Invalid = true; 7684 goto CreateNewDecl; 7685 } 7686 } else if (Name) { 7687 // If this is a named struct, check to see if there was a previous forward 7688 // declaration or definition. 7689 // FIXME: We're looking into outer scopes here, even when we 7690 // shouldn't be. Doing so can result in ambiguities that we 7691 // shouldn't be diagnosing. 7692 LookupName(Previous, S); 7693 7694 if (Previous.isAmbiguous() && 7695 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7696 LookupResult::Filter F = Previous.makeFilter(); 7697 while (F.hasNext()) { 7698 NamedDecl *ND = F.next(); 7699 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7700 F.erase(); 7701 } 7702 F.done(); 7703 } 7704 7705 // Note: there used to be some attempt at recovery here. 7706 if (Previous.isAmbiguous()) 7707 return 0; 7708 7709 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7710 // FIXME: This makes sure that we ignore the contexts associated 7711 // with C structs, unions, and enums when looking for a matching 7712 // tag declaration or definition. See the similar lookup tweak 7713 // in Sema::LookupName; is there a better way to deal with this? 7714 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7715 SearchDC = SearchDC->getParent(); 7716 } 7717 } else if (S->isFunctionPrototypeScope()) { 7718 // If this is an enum declaration in function prototype scope, set its 7719 // initial context to the translation unit. 7720 SearchDC = Context.getTranslationUnitDecl(); 7721 } 7722 7723 if (Previous.isSingleResult() && 7724 Previous.getFoundDecl()->isTemplateParameter()) { 7725 // Maybe we will complain about the shadowed template parameter. 7726 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7727 // Just pretend that we didn't see the previous declaration. 7728 Previous.clear(); 7729 } 7730 7731 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7732 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7733 // This is a declaration of or a reference to "std::bad_alloc". 7734 isStdBadAlloc = true; 7735 7736 if (Previous.empty() && StdBadAlloc) { 7737 // std::bad_alloc has been implicitly declared (but made invisible to 7738 // name lookup). Fill in this implicit declaration as the previous 7739 // declaration, so that the declarations get chained appropriately. 7740 Previous.addDecl(getStdBadAlloc()); 7741 } 7742 } 7743 7744 // If we didn't find a previous declaration, and this is a reference 7745 // (or friend reference), move to the correct scope. In C++, we 7746 // also need to do a redeclaration lookup there, just in case 7747 // there's a shadow friend decl. 7748 if (Name && Previous.empty() && 7749 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7750 if (Invalid) goto CreateNewDecl; 7751 assert(SS.isEmpty()); 7752 7753 if (TUK == TUK_Reference) { 7754 // C++ [basic.scope.pdecl]p5: 7755 // -- for an elaborated-type-specifier of the form 7756 // 7757 // class-key identifier 7758 // 7759 // if the elaborated-type-specifier is used in the 7760 // decl-specifier-seq or parameter-declaration-clause of a 7761 // function defined in namespace scope, the identifier is 7762 // declared as a class-name in the namespace that contains 7763 // the declaration; otherwise, except as a friend 7764 // declaration, the identifier is declared in the smallest 7765 // non-class, non-function-prototype scope that contains the 7766 // declaration. 7767 // 7768 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7769 // C structs and unions. 7770 // 7771 // It is an error in C++ to declare (rather than define) an enum 7772 // type, including via an elaborated type specifier. We'll 7773 // diagnose that later; for now, declare the enum in the same 7774 // scope as we would have picked for any other tag type. 7775 // 7776 // GNU C also supports this behavior as part of its incomplete 7777 // enum types extension, while GNU C++ does not. 7778 // 7779 // Find the context where we'll be declaring the tag. 7780 // FIXME: We would like to maintain the current DeclContext as the 7781 // lexical context, 7782 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7783 SearchDC = SearchDC->getParent(); 7784 7785 // Find the scope where we'll be declaring the tag. 7786 while (S->isClassScope() || 7787 (getLangOptions().CPlusPlus && 7788 S->isFunctionPrototypeScope()) || 7789 ((S->getFlags() & Scope::DeclScope) == 0) || 7790 (S->getEntity() && 7791 ((DeclContext *)S->getEntity())->isTransparentContext())) 7792 S = S->getParent(); 7793 } else { 7794 assert(TUK == TUK_Friend); 7795 // C++ [namespace.memdef]p3: 7796 // If a friend declaration in a non-local class first declares a 7797 // class or function, the friend class or function is a member of 7798 // the innermost enclosing namespace. 7799 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7800 } 7801 7802 // In C++, we need to do a redeclaration lookup to properly 7803 // diagnose some problems. 7804 if (getLangOptions().CPlusPlus) { 7805 Previous.setRedeclarationKind(ForRedeclaration); 7806 LookupQualifiedName(Previous, SearchDC); 7807 } 7808 } 7809 7810 if (!Previous.empty()) { 7811 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7812 7813 // It's okay to have a tag decl in the same scope as a typedef 7814 // which hides a tag decl in the same scope. Finding this 7815 // insanity with a redeclaration lookup can only actually happen 7816 // in C++. 7817 // 7818 // This is also okay for elaborated-type-specifiers, which is 7819 // technically forbidden by the current standard but which is 7820 // okay according to the likely resolution of an open issue; 7821 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7822 if (getLangOptions().CPlusPlus) { 7823 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7824 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7825 TagDecl *Tag = TT->getDecl(); 7826 if (Tag->getDeclName() == Name && 7827 Tag->getDeclContext()->getRedeclContext() 7828 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7829 PrevDecl = Tag; 7830 Previous.clear(); 7831 Previous.addDecl(Tag); 7832 Previous.resolveKind(); 7833 } 7834 } 7835 } 7836 } 7837 7838 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7839 // If this is a use of a previous tag, or if the tag is already declared 7840 // in the same scope (so that the definition/declaration completes or 7841 // rementions the tag), reuse the decl. 7842 if (TUK == TUK_Reference || TUK == TUK_Friend || 7843 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7844 // Make sure that this wasn't declared as an enum and now used as a 7845 // struct or something similar. 7846 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7847 TUK == TUK_Definition, KWLoc, 7848 *Name)) { 7849 bool SafeToContinue 7850 = (PrevTagDecl->getTagKind() != TTK_Enum && 7851 Kind != TTK_Enum); 7852 if (SafeToContinue) 7853 Diag(KWLoc, diag::err_use_with_wrong_tag) 7854 << Name 7855 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7856 PrevTagDecl->getKindName()); 7857 else 7858 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7859 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7860 7861 if (SafeToContinue) 7862 Kind = PrevTagDecl->getTagKind(); 7863 else { 7864 // Recover by making this an anonymous redefinition. 7865 Name = 0; 7866 Previous.clear(); 7867 Invalid = true; 7868 } 7869 } 7870 7871 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7872 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7873 7874 // All conflicts with previous declarations are recovered by 7875 // returning the previous declaration. 7876 if (ScopedEnum != PrevEnum->isScoped()) { 7877 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7878 << PrevEnum->isScoped(); 7879 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7880 return PrevTagDecl; 7881 } 7882 else if (EnumUnderlying && PrevEnum->isFixed()) { 7883 QualType T; 7884 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7885 T = TI->getType(); 7886 else 7887 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7888 7889 if (!Context.hasSameUnqualifiedType(T, 7890 PrevEnum->getIntegerType())) { 7891 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7892 diag::err_enum_redeclare_type_mismatch) 7893 << T 7894 << PrevEnum->getIntegerType(); 7895 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7896 return PrevTagDecl; 7897 } 7898 } 7899 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7900 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7901 << PrevEnum->isFixed(); 7902 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7903 return PrevTagDecl; 7904 } 7905 } 7906 7907 if (!Invalid) { 7908 // If this is a use, just return the declaration we found. 7909 7910 // FIXME: In the future, return a variant or some other clue 7911 // for the consumer of this Decl to know it doesn't own it. 7912 // For our current ASTs this shouldn't be a problem, but will 7913 // need to be changed with DeclGroups. 7914 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7915 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7916 return PrevTagDecl; 7917 7918 // Diagnose attempts to redefine a tag. 7919 if (TUK == TUK_Definition) { 7920 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7921 // If we're defining a specialization and the previous definition 7922 // is from an implicit instantiation, don't emit an error 7923 // here; we'll catch this in the general case below. 7924 if (!isExplicitSpecialization || 7925 !isa<CXXRecordDecl>(Def) || 7926 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7927 == TSK_ExplicitSpecialization) { 7928 Diag(NameLoc, diag::err_redefinition) << Name; 7929 Diag(Def->getLocation(), diag::note_previous_definition); 7930 // If this is a redefinition, recover by making this 7931 // struct be anonymous, which will make any later 7932 // references get the previous definition. 7933 Name = 0; 7934 Previous.clear(); 7935 Invalid = true; 7936 } 7937 } else { 7938 // If the type is currently being defined, complain 7939 // about a nested redefinition. 7940 const TagType *Tag 7941 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7942 if (Tag->isBeingDefined()) { 7943 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7944 Diag(PrevTagDecl->getLocation(), 7945 diag::note_previous_definition); 7946 Name = 0; 7947 Previous.clear(); 7948 Invalid = true; 7949 } 7950 } 7951 7952 // Okay, this is definition of a previously declared or referenced 7953 // tag PrevDecl. We're going to create a new Decl for it. 7954 } 7955 } 7956 // If we get here we have (another) forward declaration or we 7957 // have a definition. Just create a new decl. 7958 7959 } else { 7960 // If we get here, this is a definition of a new tag type in a nested 7961 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7962 // new decl/type. We set PrevDecl to NULL so that the entities 7963 // have distinct types. 7964 Previous.clear(); 7965 } 7966 // If we get here, we're going to create a new Decl. If PrevDecl 7967 // is non-NULL, it's a definition of the tag declared by 7968 // PrevDecl. If it's NULL, we have a new definition. 7969 7970 7971 // Otherwise, PrevDecl is not a tag, but was found with tag 7972 // lookup. This is only actually possible in C++, where a few 7973 // things like templates still live in the tag namespace. 7974 } else { 7975 assert(getLangOptions().CPlusPlus); 7976 7977 // Use a better diagnostic if an elaborated-type-specifier 7978 // found the wrong kind of type on the first 7979 // (non-redeclaration) lookup. 7980 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7981 !Previous.isForRedeclaration()) { 7982 unsigned Kind = 0; 7983 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7984 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7985 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7986 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7987 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7988 Invalid = true; 7989 7990 // Otherwise, only diagnose if the declaration is in scope. 7991 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7992 isExplicitSpecialization)) { 7993 // do nothing 7994 7995 // Diagnose implicit declarations introduced by elaborated types. 7996 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7997 unsigned Kind = 0; 7998 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7999 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8000 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8001 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8002 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8003 Invalid = true; 8004 8005 // Otherwise it's a declaration. Call out a particularly common 8006 // case here. 8007 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8008 unsigned Kind = 0; 8009 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8010 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8011 << Name << Kind << TND->getUnderlyingType(); 8012 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8013 Invalid = true; 8014 8015 // Otherwise, diagnose. 8016 } else { 8017 // The tag name clashes with something else in the target scope, 8018 // issue an error and recover by making this tag be anonymous. 8019 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8020 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8021 Name = 0; 8022 Invalid = true; 8023 } 8024 8025 // The existing declaration isn't relevant to us; we're in a 8026 // new scope, so clear out the previous declaration. 8027 Previous.clear(); 8028 } 8029 } 8030 8031CreateNewDecl: 8032 8033 TagDecl *PrevDecl = 0; 8034 if (Previous.isSingleResult()) 8035 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8036 8037 // If there is an identifier, use the location of the identifier as the 8038 // location of the decl, otherwise use the location of the struct/union 8039 // keyword. 8040 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8041 8042 // Otherwise, create a new declaration. If there is a previous 8043 // declaration of the same entity, the two will be linked via 8044 // PrevDecl. 8045 TagDecl *New; 8046 8047 bool IsForwardReference = false; 8048 if (Kind == TTK_Enum) { 8049 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8050 // enum X { A, B, C } D; D should chain to X. 8051 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8052 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8053 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8054 // If this is an undefined enum, warn. 8055 if (TUK != TUK_Definition && !Invalid) { 8056 TagDecl *Def; 8057 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8058 // C++0x: 7.2p2: opaque-enum-declaration. 8059 // Conflicts are diagnosed above. Do nothing. 8060 } 8061 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8062 Diag(Loc, diag::ext_forward_ref_enum_def) 8063 << New; 8064 Diag(Def->getLocation(), diag::note_previous_definition); 8065 } else { 8066 unsigned DiagID = diag::ext_forward_ref_enum; 8067 if (getLangOptions().MicrosoftExt) 8068 DiagID = diag::ext_ms_forward_ref_enum; 8069 else if (getLangOptions().CPlusPlus) 8070 DiagID = diag::err_forward_ref_enum; 8071 Diag(Loc, DiagID); 8072 8073 // If this is a forward-declared reference to an enumeration, make a 8074 // note of it; we won't actually be introducing the declaration into 8075 // the declaration context. 8076 if (TUK == TUK_Reference) 8077 IsForwardReference = true; 8078 } 8079 } 8080 8081 if (EnumUnderlying) { 8082 EnumDecl *ED = cast<EnumDecl>(New); 8083 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8084 ED->setIntegerTypeSourceInfo(TI); 8085 else 8086 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8087 ED->setPromotionType(ED->getIntegerType()); 8088 } 8089 8090 } else { 8091 // struct/union/class 8092 8093 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8094 // struct X { int A; } D; D should chain to X. 8095 if (getLangOptions().CPlusPlus) { 8096 // FIXME: Look for a way to use RecordDecl for simple structs. 8097 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8098 cast_or_null<CXXRecordDecl>(PrevDecl)); 8099 8100 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8101 StdBadAlloc = cast<CXXRecordDecl>(New); 8102 } else 8103 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8104 cast_or_null<RecordDecl>(PrevDecl)); 8105 } 8106 8107 // Maybe add qualifier info. 8108 if (SS.isNotEmpty()) { 8109 if (SS.isSet()) { 8110 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8111 if (TemplateParameterLists.size() > 0) { 8112 New->setTemplateParameterListsInfo(Context, 8113 TemplateParameterLists.size(), 8114 (TemplateParameterList**) TemplateParameterLists.release()); 8115 } 8116 } 8117 else 8118 Invalid = true; 8119 } 8120 8121 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8122 // Add alignment attributes if necessary; these attributes are checked when 8123 // the ASTContext lays out the structure. 8124 // 8125 // It is important for implementing the correct semantics that this 8126 // happen here (in act on tag decl). The #pragma pack stack is 8127 // maintained as a result of parser callbacks which can occur at 8128 // many points during the parsing of a struct declaration (because 8129 // the #pragma tokens are effectively skipped over during the 8130 // parsing of the struct). 8131 AddAlignmentAttributesForRecord(RD); 8132 8133 AddMsStructLayoutForRecord(RD); 8134 } 8135 8136 if (PrevDecl && PrevDecl->isModulePrivate()) 8137 New->setModulePrivate(); 8138 else if (ModulePrivateLoc.isValid()) { 8139 if (isExplicitSpecialization) 8140 Diag(New->getLocation(), diag::err_module_private_specialization) 8141 << 2 8142 << FixItHint::CreateRemoval(ModulePrivateLoc); 8143 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8144 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8145 // __module_private__ does not apply to local classes. However, we only 8146 // diagnose this as an error when the declaration specifiers are 8147 // freestanding. Here, we just ignore the __module_private__. 8148 // foobar 8149 else if (!SearchDC->isFunctionOrMethod()) 8150 New->setModulePrivate(); 8151 } 8152 8153 // If this is a specialization of a member class (of a class template), 8154 // check the specialization. 8155 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8156 Invalid = true; 8157 8158 if (Invalid) 8159 New->setInvalidDecl(); 8160 8161 if (Attr) 8162 ProcessDeclAttributeList(S, New, Attr); 8163 8164 // If we're declaring or defining a tag in function prototype scope 8165 // in C, note that this type can only be used within the function. 8166 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8167 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8168 8169 // Set the lexical context. If the tag has a C++ scope specifier, the 8170 // lexical context will be different from the semantic context. 8171 New->setLexicalDeclContext(CurContext); 8172 8173 // Mark this as a friend decl if applicable. 8174 // In Microsoft mode, a friend declaration also acts as a forward 8175 // declaration so we always pass true to setObjectOfFriendDecl to make 8176 // the tag name visible. 8177 if (TUK == TUK_Friend) 8178 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8179 getLangOptions().MicrosoftExt); 8180 8181 // Set the access specifier. 8182 if (!Invalid && SearchDC->isRecord()) 8183 SetMemberAccessSpecifier(New, PrevDecl, AS); 8184 8185 if (TUK == TUK_Definition) 8186 New->startDefinition(); 8187 8188 // If this has an identifier, add it to the scope stack. 8189 if (TUK == TUK_Friend) { 8190 // We might be replacing an existing declaration in the lookup tables; 8191 // if so, borrow its access specifier. 8192 if (PrevDecl) 8193 New->setAccess(PrevDecl->getAccess()); 8194 8195 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8196 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8197 if (Name) // can be null along some error paths 8198 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8199 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8200 } else if (Name) { 8201 S = getNonFieldDeclScope(S); 8202 PushOnScopeChains(New, S, !IsForwardReference); 8203 if (IsForwardReference) 8204 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8205 8206 } else { 8207 CurContext->addDecl(New); 8208 } 8209 8210 // If this is the C FILE type, notify the AST context. 8211 if (IdentifierInfo *II = New->getIdentifier()) 8212 if (!New->isInvalidDecl() && 8213 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8214 II->isStr("FILE")) 8215 Context.setFILEDecl(New); 8216 8217 OwnedDecl = true; 8218 return New; 8219} 8220 8221void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8222 AdjustDeclIfTemplate(TagD); 8223 TagDecl *Tag = cast<TagDecl>(TagD); 8224 8225 // Enter the tag context. 8226 PushDeclContext(S, Tag); 8227} 8228 8229Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8230 assert(isa<ObjCContainerDecl>(IDecl) && 8231 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8232 DeclContext *OCD = cast<DeclContext>(IDecl); 8233 assert(getContainingDC(OCD) == CurContext && 8234 "The next DeclContext should be lexically contained in the current one."); 8235 CurContext = OCD; 8236 return IDecl; 8237} 8238 8239void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8240 SourceLocation FinalLoc, 8241 SourceLocation LBraceLoc) { 8242 AdjustDeclIfTemplate(TagD); 8243 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8244 8245 FieldCollector->StartClass(); 8246 8247 if (!Record->getIdentifier()) 8248 return; 8249 8250 if (FinalLoc.isValid()) 8251 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8252 8253 // C++ [class]p2: 8254 // [...] The class-name is also inserted into the scope of the 8255 // class itself; this is known as the injected-class-name. For 8256 // purposes of access checking, the injected-class-name is treated 8257 // as if it were a public member name. 8258 CXXRecordDecl *InjectedClassName 8259 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8260 Record->getLocStart(), Record->getLocation(), 8261 Record->getIdentifier(), 8262 /*PrevDecl=*/0, 8263 /*DelayTypeCreation=*/true); 8264 Context.getTypeDeclType(InjectedClassName, Record); 8265 InjectedClassName->setImplicit(); 8266 InjectedClassName->setAccess(AS_public); 8267 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8268 InjectedClassName->setDescribedClassTemplate(Template); 8269 PushOnScopeChains(InjectedClassName, S); 8270 assert(InjectedClassName->isInjectedClassName() && 8271 "Broken injected-class-name"); 8272} 8273 8274void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8275 SourceLocation RBraceLoc) { 8276 AdjustDeclIfTemplate(TagD); 8277 TagDecl *Tag = cast<TagDecl>(TagD); 8278 Tag->setRBraceLoc(RBraceLoc); 8279 8280 if (isa<CXXRecordDecl>(Tag)) 8281 FieldCollector->FinishClass(); 8282 8283 // Exit this scope of this tag's definition. 8284 PopDeclContext(); 8285 8286 // Notify the consumer that we've defined a tag. 8287 Consumer.HandleTagDeclDefinition(Tag); 8288} 8289 8290void Sema::ActOnObjCContainerFinishDefinition() { 8291 // Exit this scope of this interface definition. 8292 PopDeclContext(); 8293} 8294 8295void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8296 assert(DC == CurContext && "Mismatch of container contexts"); 8297 OriginalLexicalContext = DC; 8298 ActOnObjCContainerFinishDefinition(); 8299} 8300 8301void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8302 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8303 OriginalLexicalContext = 0; 8304} 8305 8306void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8307 AdjustDeclIfTemplate(TagD); 8308 TagDecl *Tag = cast<TagDecl>(TagD); 8309 Tag->setInvalidDecl(); 8310 8311 // We're undoing ActOnTagStartDefinition here, not 8312 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8313 // the FieldCollector. 8314 8315 PopDeclContext(); 8316} 8317 8318// Note that FieldName may be null for anonymous bitfields. 8319bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8320 QualType FieldTy, const Expr *BitWidth, 8321 bool *ZeroWidth) { 8322 // Default to true; that shouldn't confuse checks for emptiness 8323 if (ZeroWidth) 8324 *ZeroWidth = true; 8325 8326 // C99 6.7.2.1p4 - verify the field type. 8327 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8328 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8329 // Handle incomplete types with specific error. 8330 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8331 return true; 8332 if (FieldName) 8333 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8334 << FieldName << FieldTy << BitWidth->getSourceRange(); 8335 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8336 << FieldTy << BitWidth->getSourceRange(); 8337 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8338 UPPC_BitFieldWidth)) 8339 return true; 8340 8341 // If the bit-width is type- or value-dependent, don't try to check 8342 // it now. 8343 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8344 return false; 8345 8346 llvm::APSInt Value; 8347 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8348 return true; 8349 8350 if (Value != 0 && ZeroWidth) 8351 *ZeroWidth = false; 8352 8353 // Zero-width bitfield is ok for anonymous field. 8354 if (Value == 0 && FieldName) 8355 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8356 8357 if (Value.isSigned() && Value.isNegative()) { 8358 if (FieldName) 8359 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8360 << FieldName << Value.toString(10); 8361 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8362 << Value.toString(10); 8363 } 8364 8365 if (!FieldTy->isDependentType()) { 8366 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8367 if (Value.getZExtValue() > TypeSize) { 8368 if (!getLangOptions().CPlusPlus) { 8369 if (FieldName) 8370 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8371 << FieldName << (unsigned)Value.getZExtValue() 8372 << (unsigned)TypeSize; 8373 8374 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8375 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8376 } 8377 8378 if (FieldName) 8379 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8380 << FieldName << (unsigned)Value.getZExtValue() 8381 << (unsigned)TypeSize; 8382 else 8383 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8384 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8385 } 8386 } 8387 8388 return false; 8389} 8390 8391/// ActOnField - Each field of a C struct/union is passed into this in order 8392/// to create a FieldDecl object for it. 8393Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8394 Declarator &D, Expr *BitfieldWidth) { 8395 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8396 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8397 /*HasInit=*/false, AS_public); 8398 return Res; 8399} 8400 8401/// HandleField - Analyze a field of a C struct or a C++ data member. 8402/// 8403FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8404 SourceLocation DeclStart, 8405 Declarator &D, Expr *BitWidth, bool HasInit, 8406 AccessSpecifier AS) { 8407 IdentifierInfo *II = D.getIdentifier(); 8408 SourceLocation Loc = DeclStart; 8409 if (II) Loc = D.getIdentifierLoc(); 8410 8411 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8412 QualType T = TInfo->getType(); 8413 if (getLangOptions().CPlusPlus) { 8414 CheckExtraCXXDefaultArguments(D); 8415 8416 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8417 UPPC_DataMemberType)) { 8418 D.setInvalidType(); 8419 T = Context.IntTy; 8420 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8421 } 8422 } 8423 8424 DiagnoseFunctionSpecifiers(D); 8425 8426 if (D.getDeclSpec().isThreadSpecified()) 8427 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8428 if (D.getDeclSpec().isConstexprSpecified()) 8429 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8430 << 2; 8431 8432 // Check to see if this name was declared as a member previously 8433 NamedDecl *PrevDecl = 0; 8434 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8435 LookupName(Previous, S); 8436 switch (Previous.getResultKind()) { 8437 case LookupResult::Found: 8438 case LookupResult::FoundUnresolvedValue: 8439 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8440 break; 8441 8442 case LookupResult::FoundOverloaded: 8443 PrevDecl = Previous.getRepresentativeDecl(); 8444 break; 8445 8446 case LookupResult::NotFound: 8447 case LookupResult::NotFoundInCurrentInstantiation: 8448 case LookupResult::Ambiguous: 8449 break; 8450 } 8451 Previous.suppressDiagnostics(); 8452 8453 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8454 // Maybe we will complain about the shadowed template parameter. 8455 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8456 // Just pretend that we didn't see the previous declaration. 8457 PrevDecl = 0; 8458 } 8459 8460 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8461 PrevDecl = 0; 8462 8463 bool Mutable 8464 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8465 SourceLocation TSSL = D.getSourceRange().getBegin(); 8466 FieldDecl *NewFD 8467 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8468 TSSL, AS, PrevDecl, &D); 8469 8470 if (NewFD->isInvalidDecl()) 8471 Record->setInvalidDecl(); 8472 8473 if (D.getDeclSpec().isModulePrivateSpecified()) 8474 NewFD->setModulePrivate(); 8475 8476 if (NewFD->isInvalidDecl() && PrevDecl) { 8477 // Don't introduce NewFD into scope; there's already something 8478 // with the same name in the same scope. 8479 } else if (II) { 8480 PushOnScopeChains(NewFD, S); 8481 } else 8482 Record->addDecl(NewFD); 8483 8484 return NewFD; 8485} 8486 8487/// \brief Build a new FieldDecl and check its well-formedness. 8488/// 8489/// This routine builds a new FieldDecl given the fields name, type, 8490/// record, etc. \p PrevDecl should refer to any previous declaration 8491/// with the same name and in the same scope as the field to be 8492/// created. 8493/// 8494/// \returns a new FieldDecl. 8495/// 8496/// \todo The Declarator argument is a hack. It will be removed once 8497FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8498 TypeSourceInfo *TInfo, 8499 RecordDecl *Record, SourceLocation Loc, 8500 bool Mutable, Expr *BitWidth, bool HasInit, 8501 SourceLocation TSSL, 8502 AccessSpecifier AS, NamedDecl *PrevDecl, 8503 Declarator *D) { 8504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8505 bool InvalidDecl = false; 8506 if (D) InvalidDecl = D->isInvalidType(); 8507 8508 // If we receive a broken type, recover by assuming 'int' and 8509 // marking this declaration as invalid. 8510 if (T.isNull()) { 8511 InvalidDecl = true; 8512 T = Context.IntTy; 8513 } 8514 8515 QualType EltTy = Context.getBaseElementType(T); 8516 if (!EltTy->isDependentType() && 8517 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8518 // Fields of incomplete type force their record to be invalid. 8519 Record->setInvalidDecl(); 8520 InvalidDecl = true; 8521 } 8522 8523 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8524 // than a variably modified type. 8525 if (!InvalidDecl && T->isVariablyModifiedType()) { 8526 bool SizeIsNegative; 8527 llvm::APSInt Oversized; 8528 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8529 SizeIsNegative, 8530 Oversized); 8531 if (!FixedTy.isNull()) { 8532 Diag(Loc, diag::warn_illegal_constant_array_size); 8533 T = FixedTy; 8534 } else { 8535 if (SizeIsNegative) 8536 Diag(Loc, diag::err_typecheck_negative_array_size); 8537 else if (Oversized.getBoolValue()) 8538 Diag(Loc, diag::err_array_too_large) 8539 << Oversized.toString(10); 8540 else 8541 Diag(Loc, diag::err_typecheck_field_variable_size); 8542 InvalidDecl = true; 8543 } 8544 } 8545 8546 // Fields can not have abstract class types 8547 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8548 diag::err_abstract_type_in_decl, 8549 AbstractFieldType)) 8550 InvalidDecl = true; 8551 8552 bool ZeroWidth = false; 8553 // If this is declared as a bit-field, check the bit-field. 8554 if (!InvalidDecl && BitWidth && 8555 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8556 InvalidDecl = true; 8557 BitWidth = 0; 8558 ZeroWidth = false; 8559 } 8560 8561 // Check that 'mutable' is consistent with the type of the declaration. 8562 if (!InvalidDecl && Mutable) { 8563 unsigned DiagID = 0; 8564 if (T->isReferenceType()) 8565 DiagID = diag::err_mutable_reference; 8566 else if (T.isConstQualified()) 8567 DiagID = diag::err_mutable_const; 8568 8569 if (DiagID) { 8570 SourceLocation ErrLoc = Loc; 8571 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8572 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8573 Diag(ErrLoc, DiagID); 8574 Mutable = false; 8575 InvalidDecl = true; 8576 } 8577 } 8578 8579 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8580 BitWidth, Mutable, HasInit); 8581 if (InvalidDecl) 8582 NewFD->setInvalidDecl(); 8583 8584 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8585 Diag(Loc, diag::err_duplicate_member) << II; 8586 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8587 NewFD->setInvalidDecl(); 8588 } 8589 8590 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8591 if (Record->isUnion()) { 8592 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8593 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8594 if (RDecl->getDefinition()) { 8595 // C++ [class.union]p1: An object of a class with a non-trivial 8596 // constructor, a non-trivial copy constructor, a non-trivial 8597 // destructor, or a non-trivial copy assignment operator 8598 // cannot be a member of a union, nor can an array of such 8599 // objects. 8600 if (CheckNontrivialField(NewFD)) 8601 NewFD->setInvalidDecl(); 8602 } 8603 } 8604 8605 // C++ [class.union]p1: If a union contains a member of reference type, 8606 // the program is ill-formed. 8607 if (EltTy->isReferenceType()) { 8608 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8609 << NewFD->getDeclName() << EltTy; 8610 NewFD->setInvalidDecl(); 8611 } 8612 } 8613 } 8614 8615 // FIXME: We need to pass in the attributes given an AST 8616 // representation, not a parser representation. 8617 if (D) 8618 // FIXME: What to pass instead of TUScope? 8619 ProcessDeclAttributes(TUScope, NewFD, *D); 8620 8621 // In auto-retain/release, infer strong retension for fields of 8622 // retainable type. 8623 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8624 NewFD->setInvalidDecl(); 8625 8626 if (T.isObjCGCWeak()) 8627 Diag(Loc, diag::warn_attribute_weak_on_field); 8628 8629 NewFD->setAccess(AS); 8630 return NewFD; 8631} 8632 8633bool Sema::CheckNontrivialField(FieldDecl *FD) { 8634 assert(FD); 8635 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8636 8637 if (FD->isInvalidDecl()) 8638 return true; 8639 8640 QualType EltTy = Context.getBaseElementType(FD->getType()); 8641 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8642 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8643 if (RDecl->getDefinition()) { 8644 // We check for copy constructors before constructors 8645 // because otherwise we'll never get complaints about 8646 // copy constructors. 8647 8648 CXXSpecialMember member = CXXInvalid; 8649 if (!RDecl->hasTrivialCopyConstructor()) 8650 member = CXXCopyConstructor; 8651 else if (!RDecl->hasTrivialDefaultConstructor()) 8652 member = CXXDefaultConstructor; 8653 else if (!RDecl->hasTrivialCopyAssignment()) 8654 member = CXXCopyAssignment; 8655 else if (!RDecl->hasTrivialDestructor()) 8656 member = CXXDestructor; 8657 8658 if (member != CXXInvalid) { 8659 if (!getLangOptions().CPlusPlus0x && 8660 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8661 // Objective-C++ ARC: it is an error to have a non-trivial field of 8662 // a union. However, system headers in Objective-C programs 8663 // occasionally have Objective-C lifetime objects within unions, 8664 // and rather than cause the program to fail, we make those 8665 // members unavailable. 8666 SourceLocation Loc = FD->getLocation(); 8667 if (getSourceManager().isInSystemHeader(Loc)) { 8668 if (!FD->hasAttr<UnavailableAttr>()) 8669 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8670 "this system field has retaining ownership")); 8671 return false; 8672 } 8673 } 8674 8675 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8676 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8677 diag::err_illegal_union_or_anon_struct_member) 8678 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8679 DiagnoseNontrivial(RT, member); 8680 return !getLangOptions().CPlusPlus0x; 8681 } 8682 } 8683 } 8684 8685 return false; 8686} 8687 8688/// DiagnoseNontrivial - Given that a class has a non-trivial 8689/// special member, figure out why. 8690void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8691 QualType QT(T, 0U); 8692 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8693 8694 // Check whether the member was user-declared. 8695 switch (member) { 8696 case CXXInvalid: 8697 break; 8698 8699 case CXXDefaultConstructor: 8700 if (RD->hasUserDeclaredConstructor()) { 8701 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8702 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8703 const FunctionDecl *body = 0; 8704 ci->hasBody(body); 8705 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8706 SourceLocation CtorLoc = ci->getLocation(); 8707 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8708 return; 8709 } 8710 } 8711 8712 llvm_unreachable("found no user-declared constructors"); 8713 } 8714 break; 8715 8716 case CXXCopyConstructor: 8717 if (RD->hasUserDeclaredCopyConstructor()) { 8718 SourceLocation CtorLoc = 8719 RD->getCopyConstructor(0)->getLocation(); 8720 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8721 return; 8722 } 8723 break; 8724 8725 case CXXMoveConstructor: 8726 if (RD->hasUserDeclaredMoveConstructor()) { 8727 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8728 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8729 return; 8730 } 8731 break; 8732 8733 case CXXCopyAssignment: 8734 if (RD->hasUserDeclaredCopyAssignment()) { 8735 // FIXME: this should use the location of the copy 8736 // assignment, not the type. 8737 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8738 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8739 return; 8740 } 8741 break; 8742 8743 case CXXMoveAssignment: 8744 if (RD->hasUserDeclaredMoveAssignment()) { 8745 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8746 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8747 return; 8748 } 8749 break; 8750 8751 case CXXDestructor: 8752 if (RD->hasUserDeclaredDestructor()) { 8753 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8754 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8755 return; 8756 } 8757 break; 8758 } 8759 8760 typedef CXXRecordDecl::base_class_iterator base_iter; 8761 8762 // Virtual bases and members inhibit trivial copying/construction, 8763 // but not trivial destruction. 8764 if (member != CXXDestructor) { 8765 // Check for virtual bases. vbases includes indirect virtual bases, 8766 // so we just iterate through the direct bases. 8767 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8768 if (bi->isVirtual()) { 8769 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8770 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8771 return; 8772 } 8773 8774 // Check for virtual methods. 8775 typedef CXXRecordDecl::method_iterator meth_iter; 8776 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8777 ++mi) { 8778 if (mi->isVirtual()) { 8779 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8780 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8781 return; 8782 } 8783 } 8784 } 8785 8786 bool (CXXRecordDecl::*hasTrivial)() const; 8787 switch (member) { 8788 case CXXDefaultConstructor: 8789 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8790 case CXXCopyConstructor: 8791 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8792 case CXXCopyAssignment: 8793 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8794 case CXXDestructor: 8795 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8796 default: 8797 llvm_unreachable("unexpected special member"); 8798 } 8799 8800 // Check for nontrivial bases (and recurse). 8801 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8802 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8803 assert(BaseRT && "Don't know how to handle dependent bases"); 8804 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8805 if (!(BaseRecTy->*hasTrivial)()) { 8806 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8807 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8808 DiagnoseNontrivial(BaseRT, member); 8809 return; 8810 } 8811 } 8812 8813 // Check for nontrivial members (and recurse). 8814 typedef RecordDecl::field_iterator field_iter; 8815 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8816 ++fi) { 8817 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8818 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8819 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8820 8821 if (!(EltRD->*hasTrivial)()) { 8822 SourceLocation FLoc = (*fi)->getLocation(); 8823 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8824 DiagnoseNontrivial(EltRT, member); 8825 return; 8826 } 8827 } 8828 8829 if (EltTy->isObjCLifetimeType()) { 8830 switch (EltTy.getObjCLifetime()) { 8831 case Qualifiers::OCL_None: 8832 case Qualifiers::OCL_ExplicitNone: 8833 break; 8834 8835 case Qualifiers::OCL_Autoreleasing: 8836 case Qualifiers::OCL_Weak: 8837 case Qualifiers::OCL_Strong: 8838 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8839 << QT << EltTy.getObjCLifetime(); 8840 return; 8841 } 8842 } 8843 } 8844 8845 llvm_unreachable("found no explanation for non-trivial member"); 8846} 8847 8848/// TranslateIvarVisibility - Translate visibility from a token ID to an 8849/// AST enum value. 8850static ObjCIvarDecl::AccessControl 8851TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8852 switch (ivarVisibility) { 8853 default: llvm_unreachable("Unknown visitibility kind"); 8854 case tok::objc_private: return ObjCIvarDecl::Private; 8855 case tok::objc_public: return ObjCIvarDecl::Public; 8856 case tok::objc_protected: return ObjCIvarDecl::Protected; 8857 case tok::objc_package: return ObjCIvarDecl::Package; 8858 } 8859} 8860 8861/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8862/// in order to create an IvarDecl object for it. 8863Decl *Sema::ActOnIvar(Scope *S, 8864 SourceLocation DeclStart, 8865 Declarator &D, Expr *BitfieldWidth, 8866 tok::ObjCKeywordKind Visibility) { 8867 8868 IdentifierInfo *II = D.getIdentifier(); 8869 Expr *BitWidth = (Expr*)BitfieldWidth; 8870 SourceLocation Loc = DeclStart; 8871 if (II) Loc = D.getIdentifierLoc(); 8872 8873 // FIXME: Unnamed fields can be handled in various different ways, for 8874 // example, unnamed unions inject all members into the struct namespace! 8875 8876 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8877 QualType T = TInfo->getType(); 8878 8879 if (BitWidth) { 8880 // 6.7.2.1p3, 6.7.2.1p4 8881 if (VerifyBitField(Loc, II, T, BitWidth)) { 8882 D.setInvalidType(); 8883 BitWidth = 0; 8884 } 8885 } else { 8886 // Not a bitfield. 8887 8888 // validate II. 8889 8890 } 8891 if (T->isReferenceType()) { 8892 Diag(Loc, diag::err_ivar_reference_type); 8893 D.setInvalidType(); 8894 } 8895 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8896 // than a variably modified type. 8897 else if (T->isVariablyModifiedType()) { 8898 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8899 D.setInvalidType(); 8900 } 8901 8902 // Get the visibility (access control) for this ivar. 8903 ObjCIvarDecl::AccessControl ac = 8904 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8905 : ObjCIvarDecl::None; 8906 // Must set ivar's DeclContext to its enclosing interface. 8907 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8908 ObjCContainerDecl *EnclosingContext; 8909 if (ObjCImplementationDecl *IMPDecl = 8910 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8911 if (!LangOpts.ObjCNonFragileABI2) { 8912 // Case of ivar declared in an implementation. Context is that of its class. 8913 EnclosingContext = IMPDecl->getClassInterface(); 8914 assert(EnclosingContext && "Implementation has no class interface!"); 8915 } 8916 else 8917 EnclosingContext = EnclosingDecl; 8918 } else { 8919 if (ObjCCategoryDecl *CDecl = 8920 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8921 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8922 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8923 return 0; 8924 } 8925 } 8926 EnclosingContext = EnclosingDecl; 8927 } 8928 8929 // Construct the decl. 8930 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8931 DeclStart, Loc, II, T, 8932 TInfo, ac, (Expr *)BitfieldWidth); 8933 8934 if (II) { 8935 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8936 ForRedeclaration); 8937 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8938 && !isa<TagDecl>(PrevDecl)) { 8939 Diag(Loc, diag::err_duplicate_member) << II; 8940 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8941 NewID->setInvalidDecl(); 8942 } 8943 } 8944 8945 // Process attributes attached to the ivar. 8946 ProcessDeclAttributes(S, NewID, D); 8947 8948 if (D.isInvalidType()) 8949 NewID->setInvalidDecl(); 8950 8951 // In ARC, infer 'retaining' for ivars of retainable type. 8952 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8953 NewID->setInvalidDecl(); 8954 8955 if (D.getDeclSpec().isModulePrivateSpecified()) 8956 NewID->setModulePrivate(); 8957 8958 if (II) { 8959 // FIXME: When interfaces are DeclContexts, we'll need to add 8960 // these to the interface. 8961 S->AddDecl(NewID); 8962 IdResolver.AddDecl(NewID); 8963 } 8964 8965 return NewID; 8966} 8967 8968/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8969/// class and class extensions. For every class @interface and class 8970/// extension @interface, if the last ivar is a bitfield of any type, 8971/// then add an implicit `char :0` ivar to the end of that interface. 8972void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8973 SmallVectorImpl<Decl *> &AllIvarDecls) { 8974 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8975 return; 8976 8977 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8978 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8979 8980 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8981 return; 8982 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8983 if (!ID) { 8984 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8985 if (!CD->IsClassExtension()) 8986 return; 8987 } 8988 // No need to add this to end of @implementation. 8989 else 8990 return; 8991 } 8992 // All conditions are met. Add a new bitfield to the tail end of ivars. 8993 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8994 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8995 8996 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8997 DeclLoc, DeclLoc, 0, 8998 Context.CharTy, 8999 Context.getTrivialTypeSourceInfo(Context.CharTy, 9000 DeclLoc), 9001 ObjCIvarDecl::Private, BW, 9002 true); 9003 AllIvarDecls.push_back(Ivar); 9004} 9005 9006void Sema::ActOnFields(Scope* S, 9007 SourceLocation RecLoc, Decl *EnclosingDecl, 9008 llvm::ArrayRef<Decl *> Fields, 9009 SourceLocation LBrac, SourceLocation RBrac, 9010 AttributeList *Attr) { 9011 assert(EnclosingDecl && "missing record or interface decl"); 9012 9013 // If the decl this is being inserted into is invalid, then it may be a 9014 // redeclaration or some other bogus case. Don't try to add fields to it. 9015 if (EnclosingDecl->isInvalidDecl()) 9016 return; 9017 9018 // Verify that all the fields are okay. 9019 unsigned NumNamedMembers = 0; 9020 SmallVector<FieldDecl*, 32> RecFields; 9021 9022 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9023 bool ARCErrReported = false; 9024 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9025 i != end; ++i) { 9026 FieldDecl *FD = cast<FieldDecl>(*i); 9027 9028 // Get the type for the field. 9029 const Type *FDTy = FD->getType().getTypePtr(); 9030 9031 if (!FD->isAnonymousStructOrUnion()) { 9032 // Remember all fields written by the user. 9033 RecFields.push_back(FD); 9034 } 9035 9036 // If the field is already invalid for some reason, don't emit more 9037 // diagnostics about it. 9038 if (FD->isInvalidDecl()) { 9039 EnclosingDecl->setInvalidDecl(); 9040 continue; 9041 } 9042 9043 // C99 6.7.2.1p2: 9044 // A structure or union shall not contain a member with 9045 // incomplete or function type (hence, a structure shall not 9046 // contain an instance of itself, but may contain a pointer to 9047 // an instance of itself), except that the last member of a 9048 // structure with more than one named member may have incomplete 9049 // array type; such a structure (and any union containing, 9050 // possibly recursively, a member that is such a structure) 9051 // shall not be a member of a structure or an element of an 9052 // array. 9053 if (FDTy->isFunctionType()) { 9054 // Field declared as a function. 9055 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9056 << FD->getDeclName(); 9057 FD->setInvalidDecl(); 9058 EnclosingDecl->setInvalidDecl(); 9059 continue; 9060 } else if (FDTy->isIncompleteArrayType() && Record && 9061 ((i + 1 == Fields.end() && !Record->isUnion()) || 9062 ((getLangOptions().MicrosoftExt || 9063 getLangOptions().CPlusPlus) && 9064 (i + 1 == Fields.end() || Record->isUnion())))) { 9065 // Flexible array member. 9066 // Microsoft and g++ is more permissive regarding flexible array. 9067 // It will accept flexible array in union and also 9068 // as the sole element of a struct/class. 9069 if (getLangOptions().MicrosoftExt) { 9070 if (Record->isUnion()) 9071 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9072 << FD->getDeclName(); 9073 else if (Fields.size() == 1) 9074 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9075 << FD->getDeclName() << Record->getTagKind(); 9076 } else if (getLangOptions().CPlusPlus) { 9077 if (Record->isUnion()) 9078 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9079 << FD->getDeclName(); 9080 else if (Fields.size() == 1) 9081 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9082 << FD->getDeclName() << Record->getTagKind(); 9083 } else if (NumNamedMembers < 1) { 9084 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9085 << FD->getDeclName(); 9086 FD->setInvalidDecl(); 9087 EnclosingDecl->setInvalidDecl(); 9088 continue; 9089 } 9090 if (!FD->getType()->isDependentType() && 9091 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9092 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9093 << FD->getDeclName() << FD->getType(); 9094 FD->setInvalidDecl(); 9095 EnclosingDecl->setInvalidDecl(); 9096 continue; 9097 } 9098 // Okay, we have a legal flexible array member at the end of the struct. 9099 if (Record) 9100 Record->setHasFlexibleArrayMember(true); 9101 } else if (!FDTy->isDependentType() && 9102 RequireCompleteType(FD->getLocation(), FD->getType(), 9103 diag::err_field_incomplete)) { 9104 // Incomplete type 9105 FD->setInvalidDecl(); 9106 EnclosingDecl->setInvalidDecl(); 9107 continue; 9108 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9109 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9110 // If this is a member of a union, then entire union becomes "flexible". 9111 if (Record && Record->isUnion()) { 9112 Record->setHasFlexibleArrayMember(true); 9113 } else { 9114 // If this is a struct/class and this is not the last element, reject 9115 // it. Note that GCC supports variable sized arrays in the middle of 9116 // structures. 9117 if (i + 1 != Fields.end()) 9118 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9119 << FD->getDeclName() << FD->getType(); 9120 else { 9121 // We support flexible arrays at the end of structs in 9122 // other structs as an extension. 9123 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9124 << FD->getDeclName(); 9125 if (Record) 9126 Record->setHasFlexibleArrayMember(true); 9127 } 9128 } 9129 } 9130 if (Record && FDTTy->getDecl()->hasObjectMember()) 9131 Record->setHasObjectMember(true); 9132 } else if (FDTy->isObjCObjectType()) { 9133 /// A field cannot be an Objective-c object 9134 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9135 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9136 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9137 FD->setType(T); 9138 } 9139 else if (!getLangOptions().CPlusPlus) { 9140 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9141 // It's an error in ARC if a field has lifetime. 9142 // We don't want to report this in a system header, though, 9143 // so we just make the field unavailable. 9144 // FIXME: that's really not sufficient; we need to make the type 9145 // itself invalid to, say, initialize or copy. 9146 QualType T = FD->getType(); 9147 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9148 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9149 SourceLocation loc = FD->getLocation(); 9150 if (getSourceManager().isInSystemHeader(loc)) { 9151 if (!FD->hasAttr<UnavailableAttr>()) { 9152 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9153 "this system field has retaining ownership")); 9154 } 9155 } else { 9156 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9157 } 9158 ARCErrReported = true; 9159 } 9160 } 9161 else if (getLangOptions().ObjC1 && 9162 getLangOptions().getGC() != LangOptions::NonGC && 9163 Record && !Record->hasObjectMember()) { 9164 if (FD->getType()->isObjCObjectPointerType() || 9165 FD->getType().isObjCGCStrong()) 9166 Record->setHasObjectMember(true); 9167 else if (Context.getAsArrayType(FD->getType())) { 9168 QualType BaseType = Context.getBaseElementType(FD->getType()); 9169 if (BaseType->isRecordType() && 9170 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9171 Record->setHasObjectMember(true); 9172 else if (BaseType->isObjCObjectPointerType() || 9173 BaseType.isObjCGCStrong()) 9174 Record->setHasObjectMember(true); 9175 } 9176 } 9177 } 9178 // Keep track of the number of named members. 9179 if (FD->getIdentifier()) 9180 ++NumNamedMembers; 9181 } 9182 9183 // Okay, we successfully defined 'Record'. 9184 if (Record) { 9185 bool Completed = false; 9186 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9187 if (!CXXRecord->isInvalidDecl()) { 9188 // Set access bits correctly on the directly-declared conversions. 9189 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9190 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9191 I != E; ++I) 9192 Convs->setAccess(I, (*I)->getAccess()); 9193 9194 if (!CXXRecord->isDependentType()) { 9195 // Objective-C Automatic Reference Counting: 9196 // If a class has a non-static data member of Objective-C pointer 9197 // type (or array thereof), it is a non-POD type and its 9198 // default constructor (if any), copy constructor, copy assignment 9199 // operator, and destructor are non-trivial. 9200 // 9201 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9202 // However, here we check whether this particular class is only 9203 // non-POD because of the presence of an Objective-C pointer member. 9204 // If so, objects of this type cannot be shared between code compiled 9205 // with instant objects and code compiled with manual retain/release. 9206 if (getLangOptions().ObjCAutoRefCount && 9207 CXXRecord->hasObjectMember() && 9208 CXXRecord->getLinkage() == ExternalLinkage) { 9209 if (CXXRecord->isPOD()) { 9210 Diag(CXXRecord->getLocation(), 9211 diag::warn_arc_non_pod_class_with_object_member) 9212 << CXXRecord; 9213 } else { 9214 // FIXME: Fix-Its would be nice here, but finding a good location 9215 // for them is going to be tricky. 9216 if (CXXRecord->hasTrivialCopyConstructor()) 9217 Diag(CXXRecord->getLocation(), 9218 diag::warn_arc_trivial_member_function_with_object_member) 9219 << CXXRecord << 0; 9220 if (CXXRecord->hasTrivialCopyAssignment()) 9221 Diag(CXXRecord->getLocation(), 9222 diag::warn_arc_trivial_member_function_with_object_member) 9223 << CXXRecord << 1; 9224 if (CXXRecord->hasTrivialDestructor()) 9225 Diag(CXXRecord->getLocation(), 9226 diag::warn_arc_trivial_member_function_with_object_member) 9227 << CXXRecord << 2; 9228 } 9229 } 9230 9231 // Adjust user-defined destructor exception spec. 9232 if (getLangOptions().CPlusPlus0x && 9233 CXXRecord->hasUserDeclaredDestructor()) 9234 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9235 9236 // Add any implicitly-declared members to this class. 9237 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9238 9239 // If we have virtual base classes, we may end up finding multiple 9240 // final overriders for a given virtual function. Check for this 9241 // problem now. 9242 if (CXXRecord->getNumVBases()) { 9243 CXXFinalOverriderMap FinalOverriders; 9244 CXXRecord->getFinalOverriders(FinalOverriders); 9245 9246 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9247 MEnd = FinalOverriders.end(); 9248 M != MEnd; ++M) { 9249 for (OverridingMethods::iterator SO = M->second.begin(), 9250 SOEnd = M->second.end(); 9251 SO != SOEnd; ++SO) { 9252 assert(SO->second.size() > 0 && 9253 "Virtual function without overridding functions?"); 9254 if (SO->second.size() == 1) 9255 continue; 9256 9257 // C++ [class.virtual]p2: 9258 // In a derived class, if a virtual member function of a base 9259 // class subobject has more than one final overrider the 9260 // program is ill-formed. 9261 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9262 << (NamedDecl *)M->first << Record; 9263 Diag(M->first->getLocation(), 9264 diag::note_overridden_virtual_function); 9265 for (OverridingMethods::overriding_iterator 9266 OM = SO->second.begin(), 9267 OMEnd = SO->second.end(); 9268 OM != OMEnd; ++OM) 9269 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9270 << (NamedDecl *)M->first << OM->Method->getParent(); 9271 9272 Record->setInvalidDecl(); 9273 } 9274 } 9275 CXXRecord->completeDefinition(&FinalOverriders); 9276 Completed = true; 9277 } 9278 } 9279 } 9280 } 9281 9282 if (!Completed) 9283 Record->completeDefinition(); 9284 9285 // Now that the record is complete, do any delayed exception spec checks 9286 // we were missing. 9287 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9288 const CXXDestructorDecl *Dtor = 9289 DelayedDestructorExceptionSpecChecks.back().first; 9290 if (Dtor->getParent() != Record) 9291 break; 9292 9293 assert(!Dtor->getParent()->isDependentType() && 9294 "Should not ever add destructors of templates into the list."); 9295 CheckOverridingFunctionExceptionSpec(Dtor, 9296 DelayedDestructorExceptionSpecChecks.back().second); 9297 DelayedDestructorExceptionSpecChecks.pop_back(); 9298 } 9299 9300 } else { 9301 ObjCIvarDecl **ClsFields = 9302 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9303 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9304 ID->setLocEnd(RBrac); 9305 // Add ivar's to class's DeclContext. 9306 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9307 ClsFields[i]->setLexicalDeclContext(ID); 9308 ID->addDecl(ClsFields[i]); 9309 } 9310 // Must enforce the rule that ivars in the base classes may not be 9311 // duplicates. 9312 if (ID->getSuperClass()) 9313 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9314 } else if (ObjCImplementationDecl *IMPDecl = 9315 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9316 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9317 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9318 // Ivar declared in @implementation never belongs to the implementation. 9319 // Only it is in implementation's lexical context. 9320 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9321 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9322 } else if (ObjCCategoryDecl *CDecl = 9323 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9324 // case of ivars in class extension; all other cases have been 9325 // reported as errors elsewhere. 9326 // FIXME. Class extension does not have a LocEnd field. 9327 // CDecl->setLocEnd(RBrac); 9328 // Add ivar's to class extension's DeclContext. 9329 // Diagnose redeclaration of private ivars. 9330 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9331 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9332 if (IDecl) { 9333 if (const ObjCIvarDecl *ClsIvar = 9334 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9335 Diag(ClsFields[i]->getLocation(), 9336 diag::err_duplicate_ivar_declaration); 9337 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9338 continue; 9339 } 9340 for (const ObjCCategoryDecl *ClsExtDecl = 9341 IDecl->getFirstClassExtension(); 9342 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9343 if (const ObjCIvarDecl *ClsExtIvar = 9344 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9345 Diag(ClsFields[i]->getLocation(), 9346 diag::err_duplicate_ivar_declaration); 9347 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9348 continue; 9349 } 9350 } 9351 } 9352 ClsFields[i]->setLexicalDeclContext(CDecl); 9353 CDecl->addDecl(ClsFields[i]); 9354 } 9355 } 9356 } 9357 9358 if (Attr) 9359 ProcessDeclAttributeList(S, Record, Attr); 9360 9361 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9362 // set the visibility of this record. 9363 if (Record && !Record->getDeclContext()->isRecord()) 9364 AddPushedVisibilityAttribute(Record); 9365} 9366 9367/// \brief Determine whether the given integral value is representable within 9368/// the given type T. 9369static bool isRepresentableIntegerValue(ASTContext &Context, 9370 llvm::APSInt &Value, 9371 QualType T) { 9372 assert(T->isIntegralType(Context) && "Integral type required!"); 9373 unsigned BitWidth = Context.getIntWidth(T); 9374 9375 if (Value.isUnsigned() || Value.isNonNegative()) { 9376 if (T->isSignedIntegerOrEnumerationType()) 9377 --BitWidth; 9378 return Value.getActiveBits() <= BitWidth; 9379 } 9380 return Value.getMinSignedBits() <= BitWidth; 9381} 9382 9383// \brief Given an integral type, return the next larger integral type 9384// (or a NULL type of no such type exists). 9385static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9386 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9387 // enum checking below. 9388 assert(T->isIntegralType(Context) && "Integral type required!"); 9389 const unsigned NumTypes = 4; 9390 QualType SignedIntegralTypes[NumTypes] = { 9391 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9392 }; 9393 QualType UnsignedIntegralTypes[NumTypes] = { 9394 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9395 Context.UnsignedLongLongTy 9396 }; 9397 9398 unsigned BitWidth = Context.getTypeSize(T); 9399 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9400 : UnsignedIntegralTypes; 9401 for (unsigned I = 0; I != NumTypes; ++I) 9402 if (Context.getTypeSize(Types[I]) > BitWidth) 9403 return Types[I]; 9404 9405 return QualType(); 9406} 9407 9408EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9409 EnumConstantDecl *LastEnumConst, 9410 SourceLocation IdLoc, 9411 IdentifierInfo *Id, 9412 Expr *Val) { 9413 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9414 llvm::APSInt EnumVal(IntWidth); 9415 QualType EltTy; 9416 9417 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9418 Val = 0; 9419 9420 if (Val) { 9421 if (Enum->isDependentType() || Val->isTypeDependent()) 9422 EltTy = Context.DependentTy; 9423 else { 9424 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9425 SourceLocation ExpLoc; 9426 if (!Val->isValueDependent() && 9427 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9428 Val = 0; 9429 } else { 9430 if (!getLangOptions().CPlusPlus) { 9431 // C99 6.7.2.2p2: 9432 // The expression that defines the value of an enumeration constant 9433 // shall be an integer constant expression that has a value 9434 // representable as an int. 9435 9436 // Complain if the value is not representable in an int. 9437 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9438 Diag(IdLoc, diag::ext_enum_value_not_int) 9439 << EnumVal.toString(10) << Val->getSourceRange() 9440 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9441 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9442 // Force the type of the expression to 'int'. 9443 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9444 } 9445 } 9446 9447 if (Enum->isFixed()) { 9448 EltTy = Enum->getIntegerType(); 9449 9450 // C++0x [dcl.enum]p5: 9451 // ... if the initializing value of an enumerator cannot be 9452 // represented by the underlying type, the program is ill-formed. 9453 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9454 if (getLangOptions().MicrosoftExt) { 9455 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9456 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9457 } else 9458 Diag(IdLoc, diag::err_enumerator_too_large) 9459 << EltTy; 9460 } else 9461 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9462 } 9463 else { 9464 // C++0x [dcl.enum]p5: 9465 // If the underlying type is not fixed, the type of each enumerator 9466 // is the type of its initializing value: 9467 // - If an initializer is specified for an enumerator, the 9468 // initializing value has the same type as the expression. 9469 EltTy = Val->getType(); 9470 } 9471 } 9472 } 9473 } 9474 9475 if (!Val) { 9476 if (Enum->isDependentType()) 9477 EltTy = Context.DependentTy; 9478 else if (!LastEnumConst) { 9479 // C++0x [dcl.enum]p5: 9480 // If the underlying type is not fixed, the type of each enumerator 9481 // is the type of its initializing value: 9482 // - If no initializer is specified for the first enumerator, the 9483 // initializing value has an unspecified integral type. 9484 // 9485 // GCC uses 'int' for its unspecified integral type, as does 9486 // C99 6.7.2.2p3. 9487 if (Enum->isFixed()) { 9488 EltTy = Enum->getIntegerType(); 9489 } 9490 else { 9491 EltTy = Context.IntTy; 9492 } 9493 } else { 9494 // Assign the last value + 1. 9495 EnumVal = LastEnumConst->getInitVal(); 9496 ++EnumVal; 9497 EltTy = LastEnumConst->getType(); 9498 9499 // Check for overflow on increment. 9500 if (EnumVal < LastEnumConst->getInitVal()) { 9501 // C++0x [dcl.enum]p5: 9502 // If the underlying type is not fixed, the type of each enumerator 9503 // is the type of its initializing value: 9504 // 9505 // - Otherwise the type of the initializing value is the same as 9506 // the type of the initializing value of the preceding enumerator 9507 // unless the incremented value is not representable in that type, 9508 // in which case the type is an unspecified integral type 9509 // sufficient to contain the incremented value. If no such type 9510 // exists, the program is ill-formed. 9511 QualType T = getNextLargerIntegralType(Context, EltTy); 9512 if (T.isNull() || Enum->isFixed()) { 9513 // There is no integral type larger enough to represent this 9514 // value. Complain, then allow the value to wrap around. 9515 EnumVal = LastEnumConst->getInitVal(); 9516 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9517 ++EnumVal; 9518 if (Enum->isFixed()) 9519 // When the underlying type is fixed, this is ill-formed. 9520 Diag(IdLoc, diag::err_enumerator_wrapped) 9521 << EnumVal.toString(10) 9522 << EltTy; 9523 else 9524 Diag(IdLoc, diag::warn_enumerator_too_large) 9525 << EnumVal.toString(10); 9526 } else { 9527 EltTy = T; 9528 } 9529 9530 // Retrieve the last enumerator's value, extent that type to the 9531 // type that is supposed to be large enough to represent the incremented 9532 // value, then increment. 9533 EnumVal = LastEnumConst->getInitVal(); 9534 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9535 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9536 ++EnumVal; 9537 9538 // If we're not in C++, diagnose the overflow of enumerator values, 9539 // which in C99 means that the enumerator value is not representable in 9540 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9541 // permits enumerator values that are representable in some larger 9542 // integral type. 9543 if (!getLangOptions().CPlusPlus && !T.isNull()) 9544 Diag(IdLoc, diag::warn_enum_value_overflow); 9545 } else if (!getLangOptions().CPlusPlus && 9546 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9547 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9548 Diag(IdLoc, diag::ext_enum_value_not_int) 9549 << EnumVal.toString(10) << 1; 9550 } 9551 } 9552 } 9553 9554 if (!EltTy->isDependentType()) { 9555 // Make the enumerator value match the signedness and size of the 9556 // enumerator's type. 9557 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9558 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9559 } 9560 9561 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9562 Val, EnumVal); 9563} 9564 9565 9566Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9567 SourceLocation IdLoc, IdentifierInfo *Id, 9568 AttributeList *Attr, 9569 SourceLocation EqualLoc, Expr *val) { 9570 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9571 EnumConstantDecl *LastEnumConst = 9572 cast_or_null<EnumConstantDecl>(lastEnumConst); 9573 Expr *Val = static_cast<Expr*>(val); 9574 9575 // The scope passed in may not be a decl scope. Zip up the scope tree until 9576 // we find one that is. 9577 S = getNonFieldDeclScope(S); 9578 9579 // Verify that there isn't already something declared with this name in this 9580 // scope. 9581 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9582 ForRedeclaration); 9583 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9584 // Maybe we will complain about the shadowed template parameter. 9585 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9586 // Just pretend that we didn't see the previous declaration. 9587 PrevDecl = 0; 9588 } 9589 9590 if (PrevDecl) { 9591 // When in C++, we may get a TagDecl with the same name; in this case the 9592 // enum constant will 'hide' the tag. 9593 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9594 "Received TagDecl when not in C++!"); 9595 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9596 if (isa<EnumConstantDecl>(PrevDecl)) 9597 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9598 else 9599 Diag(IdLoc, diag::err_redefinition) << Id; 9600 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9601 return 0; 9602 } 9603 } 9604 9605 // C++ [class.mem]p13: 9606 // If T is the name of a class, then each of the following shall have a 9607 // name different from T: 9608 // - every enumerator of every member of class T that is an enumerated 9609 // type 9610 if (CXXRecordDecl *Record 9611 = dyn_cast<CXXRecordDecl>( 9612 TheEnumDecl->getDeclContext()->getRedeclContext())) 9613 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9614 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9615 9616 EnumConstantDecl *New = 9617 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9618 9619 if (New) { 9620 // Process attributes. 9621 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9622 9623 // Register this decl in the current scope stack. 9624 New->setAccess(TheEnumDecl->getAccess()); 9625 PushOnScopeChains(New, S); 9626 } 9627 9628 return New; 9629} 9630 9631void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9632 SourceLocation RBraceLoc, Decl *EnumDeclX, 9633 Decl **Elements, unsigned NumElements, 9634 Scope *S, AttributeList *Attr) { 9635 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9636 QualType EnumType = Context.getTypeDeclType(Enum); 9637 9638 if (Attr) 9639 ProcessDeclAttributeList(S, Enum, Attr); 9640 9641 if (Enum->isDependentType()) { 9642 for (unsigned i = 0; i != NumElements; ++i) { 9643 EnumConstantDecl *ECD = 9644 cast_or_null<EnumConstantDecl>(Elements[i]); 9645 if (!ECD) continue; 9646 9647 ECD->setType(EnumType); 9648 } 9649 9650 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9651 return; 9652 } 9653 9654 // TODO: If the result value doesn't fit in an int, it must be a long or long 9655 // long value. ISO C does not support this, but GCC does as an extension, 9656 // emit a warning. 9657 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9658 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9659 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9660 9661 // Verify that all the values are okay, compute the size of the values, and 9662 // reverse the list. 9663 unsigned NumNegativeBits = 0; 9664 unsigned NumPositiveBits = 0; 9665 9666 // Keep track of whether all elements have type int. 9667 bool AllElementsInt = true; 9668 9669 for (unsigned i = 0; i != NumElements; ++i) { 9670 EnumConstantDecl *ECD = 9671 cast_or_null<EnumConstantDecl>(Elements[i]); 9672 if (!ECD) continue; // Already issued a diagnostic. 9673 9674 const llvm::APSInt &InitVal = ECD->getInitVal(); 9675 9676 // Keep track of the size of positive and negative values. 9677 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9678 NumPositiveBits = std::max(NumPositiveBits, 9679 (unsigned)InitVal.getActiveBits()); 9680 else 9681 NumNegativeBits = std::max(NumNegativeBits, 9682 (unsigned)InitVal.getMinSignedBits()); 9683 9684 // Keep track of whether every enum element has type int (very commmon). 9685 if (AllElementsInt) 9686 AllElementsInt = ECD->getType() == Context.IntTy; 9687 } 9688 9689 // Figure out the type that should be used for this enum. 9690 QualType BestType; 9691 unsigned BestWidth; 9692 9693 // C++0x N3000 [conv.prom]p3: 9694 // An rvalue of an unscoped enumeration type whose underlying 9695 // type is not fixed can be converted to an rvalue of the first 9696 // of the following types that can represent all the values of 9697 // the enumeration: int, unsigned int, long int, unsigned long 9698 // int, long long int, or unsigned long long int. 9699 // C99 6.4.4.3p2: 9700 // An identifier declared as an enumeration constant has type int. 9701 // The C99 rule is modified by a gcc extension 9702 QualType BestPromotionType; 9703 9704 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9705 // -fshort-enums is the equivalent to specifying the packed attribute on all 9706 // enum definitions. 9707 if (LangOpts.ShortEnums) 9708 Packed = true; 9709 9710 if (Enum->isFixed()) { 9711 BestType = Enum->getIntegerType(); 9712 if (BestType->isPromotableIntegerType()) 9713 BestPromotionType = Context.getPromotedIntegerType(BestType); 9714 else 9715 BestPromotionType = BestType; 9716 // We don't need to set BestWidth, because BestType is going to be the type 9717 // of the enumerators, but we do anyway because otherwise some compilers 9718 // warn that it might be used uninitialized. 9719 BestWidth = CharWidth; 9720 } 9721 else if (NumNegativeBits) { 9722 // If there is a negative value, figure out the smallest integer type (of 9723 // int/long/longlong) that fits. 9724 // If it's packed, check also if it fits a char or a short. 9725 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9726 BestType = Context.SignedCharTy; 9727 BestWidth = CharWidth; 9728 } else if (Packed && NumNegativeBits <= ShortWidth && 9729 NumPositiveBits < ShortWidth) { 9730 BestType = Context.ShortTy; 9731 BestWidth = ShortWidth; 9732 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9733 BestType = Context.IntTy; 9734 BestWidth = IntWidth; 9735 } else { 9736 BestWidth = Context.getTargetInfo().getLongWidth(); 9737 9738 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9739 BestType = Context.LongTy; 9740 } else { 9741 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9742 9743 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9744 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9745 BestType = Context.LongLongTy; 9746 } 9747 } 9748 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9749 } else { 9750 // If there is no negative value, figure out the smallest type that fits 9751 // all of the enumerator values. 9752 // If it's packed, check also if it fits a char or a short. 9753 if (Packed && NumPositiveBits <= CharWidth) { 9754 BestType = Context.UnsignedCharTy; 9755 BestPromotionType = Context.IntTy; 9756 BestWidth = CharWidth; 9757 } else if (Packed && NumPositiveBits <= ShortWidth) { 9758 BestType = Context.UnsignedShortTy; 9759 BestPromotionType = Context.IntTy; 9760 BestWidth = ShortWidth; 9761 } else if (NumPositiveBits <= IntWidth) { 9762 BestType = Context.UnsignedIntTy; 9763 BestWidth = IntWidth; 9764 BestPromotionType 9765 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9766 ? Context.UnsignedIntTy : Context.IntTy; 9767 } else if (NumPositiveBits <= 9768 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9769 BestType = Context.UnsignedLongTy; 9770 BestPromotionType 9771 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9772 ? Context.UnsignedLongTy : Context.LongTy; 9773 } else { 9774 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9775 assert(NumPositiveBits <= BestWidth && 9776 "How could an initializer get larger than ULL?"); 9777 BestType = Context.UnsignedLongLongTy; 9778 BestPromotionType 9779 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9780 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9781 } 9782 } 9783 9784 // Loop over all of the enumerator constants, changing their types to match 9785 // the type of the enum if needed. 9786 for (unsigned i = 0; i != NumElements; ++i) { 9787 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9788 if (!ECD) continue; // Already issued a diagnostic. 9789 9790 // Standard C says the enumerators have int type, but we allow, as an 9791 // extension, the enumerators to be larger than int size. If each 9792 // enumerator value fits in an int, type it as an int, otherwise type it the 9793 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9794 // that X has type 'int', not 'unsigned'. 9795 9796 // Determine whether the value fits into an int. 9797 llvm::APSInt InitVal = ECD->getInitVal(); 9798 9799 // If it fits into an integer type, force it. Otherwise force it to match 9800 // the enum decl type. 9801 QualType NewTy; 9802 unsigned NewWidth; 9803 bool NewSign; 9804 if (!getLangOptions().CPlusPlus && 9805 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9806 NewTy = Context.IntTy; 9807 NewWidth = IntWidth; 9808 NewSign = true; 9809 } else if (ECD->getType() == BestType) { 9810 // Already the right type! 9811 if (getLangOptions().CPlusPlus) 9812 // C++ [dcl.enum]p4: Following the closing brace of an 9813 // enum-specifier, each enumerator has the type of its 9814 // enumeration. 9815 ECD->setType(EnumType); 9816 continue; 9817 } else { 9818 NewTy = BestType; 9819 NewWidth = BestWidth; 9820 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9821 } 9822 9823 // Adjust the APSInt value. 9824 InitVal = InitVal.extOrTrunc(NewWidth); 9825 InitVal.setIsSigned(NewSign); 9826 ECD->setInitVal(InitVal); 9827 9828 // Adjust the Expr initializer and type. 9829 if (ECD->getInitExpr() && 9830 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9831 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9832 CK_IntegralCast, 9833 ECD->getInitExpr(), 9834 /*base paths*/ 0, 9835 VK_RValue)); 9836 if (getLangOptions().CPlusPlus) 9837 // C++ [dcl.enum]p4: Following the closing brace of an 9838 // enum-specifier, each enumerator has the type of its 9839 // enumeration. 9840 ECD->setType(EnumType); 9841 else 9842 ECD->setType(NewTy); 9843 } 9844 9845 Enum->completeDefinition(BestType, BestPromotionType, 9846 NumPositiveBits, NumNegativeBits); 9847} 9848 9849Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9850 SourceLocation StartLoc, 9851 SourceLocation EndLoc) { 9852 StringLiteral *AsmString = cast<StringLiteral>(expr); 9853 9854 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9855 AsmString, StartLoc, 9856 EndLoc); 9857 CurContext->addDecl(New); 9858 return New; 9859} 9860 9861DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9862 IdentifierInfo &ModuleName, 9863 SourceLocation ModuleNameLoc) { 9864 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9865 ModuleName, ModuleNameLoc); 9866 if (!Module) 9867 return true; 9868 9869 // FIXME: Actually create a declaration to describe the module import. 9870 (void)Module; 9871 return DeclResult((Decl *)0); 9872} 9873 9874void 9875Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9876 SourceLocation ModulePrivateKeyword) { 9877 assert(!Old->isModulePrivate() && "Old is module-private!"); 9878 9879 Diag(New->getLocation(), diag::err_module_private_follows_public) 9880 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9881 Diag(Old->getLocation(), diag::note_previous_declaration) 9882 << Old->getDeclName(); 9883 9884 // Drop the __module_private__ from the new declaration, since it's invalid. 9885 New->setModulePrivate(false); 9886} 9887 9888void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9889 SourceLocation PragmaLoc, 9890 SourceLocation NameLoc) { 9891 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9892 9893 if (PrevDecl) { 9894 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9895 } else { 9896 (void)WeakUndeclaredIdentifiers.insert( 9897 std::pair<IdentifierInfo*,WeakInfo> 9898 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9899 } 9900} 9901 9902void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9903 IdentifierInfo* AliasName, 9904 SourceLocation PragmaLoc, 9905 SourceLocation NameLoc, 9906 SourceLocation AliasNameLoc) { 9907 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9908 LookupOrdinaryName); 9909 WeakInfo W = WeakInfo(Name, NameLoc); 9910 9911 if (PrevDecl) { 9912 if (!PrevDecl->hasAttr<AliasAttr>()) 9913 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9914 DeclApplyPragmaWeak(TUScope, ND, W); 9915 } else { 9916 (void)WeakUndeclaredIdentifiers.insert( 9917 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9918 } 9919} 9920 9921Decl *Sema::getObjCDeclContext() const { 9922 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9923} 9924 9925AvailabilityResult Sema::getCurContextAvailability() const { 9926 const Decl *D = cast<Decl>(getCurLexicalContext()); 9927 // A category implicitly has the availability of the interface. 9928 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9929 D = CatD->getClassInterface(); 9930 9931 return D->getAvailability(); 9932} 9933