SemaDecl.cpp revision 3b25216a47681e7957c0e9ec37a3cf445ab24743
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 // C++ constructors and destructors with incorrect scopes can break 3244 // our AST invariants by having the wrong underlying types. If 3245 // that's the case, then drop this declaration entirely. 3246 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3247 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3248 !Context.hasSameType(Name.getCXXNameType(), 3249 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3250 return 0; 3251 } 3252 3253 // Pretend that this qualifier was not here. 3254 D.getCXXScopeSpec().clear(); 3255 } 3256 } 3257 3258 // Check whether we need to rebuild the type of the given 3259 // declaration in the current instantiation. 3260 if (EnteringContext && IsDependentContext && 3261 TemplateParamLists.size() != 0) { 3262 ContextRAII SavedContext(*this, DC); 3263 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3264 D.setInvalidType(); 3265 } 3266 } 3267 3268 if (DiagnoseClassNameShadow(DC, NameInfo)) 3269 // If this is a typedef, we'll end up spewing multiple diagnostics. 3270 // Just return early; it's safer. 3271 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3272 return 0; 3273 3274 NamedDecl *New; 3275 3276 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3277 QualType R = TInfo->getType(); 3278 3279 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3280 UPPC_DeclarationType)) 3281 D.setInvalidType(); 3282 3283 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3284 ForRedeclaration); 3285 3286 // See if this is a redefinition of a variable in the same scope. 3287 if (!D.getCXXScopeSpec().isSet()) { 3288 bool IsLinkageLookup = false; 3289 3290 // If the declaration we're planning to build will be a function 3291 // or object with linkage, then look for another declaration with 3292 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3293 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3294 /* Do nothing*/; 3295 else if (R->isFunctionType()) { 3296 if (CurContext->isFunctionOrMethod() || 3297 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3298 IsLinkageLookup = true; 3299 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3300 IsLinkageLookup = true; 3301 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3302 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3303 IsLinkageLookup = true; 3304 3305 if (IsLinkageLookup) 3306 Previous.clear(LookupRedeclarationWithLinkage); 3307 3308 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3309 } else { // Something like "int foo::x;" 3310 LookupQualifiedName(Previous, DC); 3311 3312 // Don't consider using declarations as previous declarations for 3313 // out-of-line members. 3314 RemoveUsingDecls(Previous); 3315 3316 // C++ 7.3.1.2p2: 3317 // Members (including explicit specializations of templates) of a named 3318 // namespace can also be defined outside that namespace by explicit 3319 // qualification of the name being defined, provided that the entity being 3320 // defined was already declared in the namespace and the definition appears 3321 // after the point of declaration in a namespace that encloses the 3322 // declarations namespace. 3323 // 3324 // Note that we only check the context at this point. We don't yet 3325 // have enough information to make sure that PrevDecl is actually 3326 // the declaration we want to match. For example, given: 3327 // 3328 // class X { 3329 // void f(); 3330 // void f(float); 3331 // }; 3332 // 3333 // void X::f(int) { } // ill-formed 3334 // 3335 // In this case, PrevDecl will point to the overload set 3336 // containing the two f's declared in X, but neither of them 3337 // matches. 3338 3339 // First check whether we named the global scope. 3340 if (isa<TranslationUnitDecl>(DC)) { 3341 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3342 << Name << D.getCXXScopeSpec().getRange(); 3343 } else { 3344 DeclContext *Cur = CurContext; 3345 while (isa<LinkageSpecDecl>(Cur)) 3346 Cur = Cur->getParent(); 3347 if (!Cur->Encloses(DC)) { 3348 // The qualifying scope doesn't enclose the original declaration. 3349 // Emit diagnostic based on current scope. 3350 SourceLocation L = D.getIdentifierLoc(); 3351 SourceRange R = D.getCXXScopeSpec().getRange(); 3352 if (isa<FunctionDecl>(Cur)) 3353 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3354 else 3355 Diag(L, diag::err_invalid_declarator_scope) 3356 << Name << cast<NamedDecl>(DC) << R; 3357 D.setInvalidType(); 3358 } 3359 } 3360 } 3361 3362 if (Previous.isSingleResult() && 3363 Previous.getFoundDecl()->isTemplateParameter()) { 3364 // Maybe we will complain about the shadowed template parameter. 3365 if (!D.isInvalidType()) 3366 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3367 Previous.getFoundDecl()); 3368 3369 // Just pretend that we didn't see the previous declaration. 3370 Previous.clear(); 3371 } 3372 3373 // In C++, the previous declaration we find might be a tag type 3374 // (class or enum). In this case, the new declaration will hide the 3375 // tag type. Note that this does does not apply if we're declaring a 3376 // typedef (C++ [dcl.typedef]p4). 3377 if (Previous.isSingleTagDecl() && 3378 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3379 Previous.clear(); 3380 3381 bool AddToScope = true; 3382 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3383 if (TemplateParamLists.size()) { 3384 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3385 return 0; 3386 } 3387 3388 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3389 } else if (R->isFunctionType()) { 3390 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3391 move(TemplateParamLists), 3392 AddToScope); 3393 } else { 3394 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3395 move(TemplateParamLists)); 3396 } 3397 3398 if (New == 0) 3399 return 0; 3400 3401 // If this has an identifier and is not an invalid redeclaration or 3402 // function template specialization, add it to the scope stack. 3403 if (New->getDeclName() && AddToScope && 3404 !(D.isRedeclaration() && New->isInvalidDecl())) 3405 PushOnScopeChains(New, S); 3406 3407 return New; 3408} 3409 3410/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3411/// types into constant array types in certain situations which would otherwise 3412/// be errors (for GCC compatibility). 3413static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3414 ASTContext &Context, 3415 bool &SizeIsNegative, 3416 llvm::APSInt &Oversized) { 3417 // This method tries to turn a variable array into a constant 3418 // array even when the size isn't an ICE. This is necessary 3419 // for compatibility with code that depends on gcc's buggy 3420 // constant expression folding, like struct {char x[(int)(char*)2];} 3421 SizeIsNegative = false; 3422 Oversized = 0; 3423 3424 if (T->isDependentType()) 3425 return QualType(); 3426 3427 QualifierCollector Qs; 3428 const Type *Ty = Qs.strip(T); 3429 3430 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3431 QualType Pointee = PTy->getPointeeType(); 3432 QualType FixedType = 3433 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3434 Oversized); 3435 if (FixedType.isNull()) return FixedType; 3436 FixedType = Context.getPointerType(FixedType); 3437 return Qs.apply(Context, FixedType); 3438 } 3439 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3440 QualType Inner = PTy->getInnerType(); 3441 QualType FixedType = 3442 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3443 Oversized); 3444 if (FixedType.isNull()) return FixedType; 3445 FixedType = Context.getParenType(FixedType); 3446 return Qs.apply(Context, FixedType); 3447 } 3448 3449 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3450 if (!VLATy) 3451 return QualType(); 3452 // FIXME: We should probably handle this case 3453 if (VLATy->getElementType()->isVariablyModifiedType()) 3454 return QualType(); 3455 3456 Expr::EvalResult EvalResult; 3457 if (!VLATy->getSizeExpr() || 3458 !VLATy->getSizeExpr()->EvaluateAsRValue(EvalResult, Context) || 3459 !EvalResult.Val.isInt()) 3460 return QualType(); 3461 3462 // Check whether the array size is negative. 3463 llvm::APSInt &Res = EvalResult.Val.getInt(); 3464 if (Res.isSigned() && Res.isNegative()) { 3465 SizeIsNegative = true; 3466 return QualType(); 3467 } 3468 3469 // Check whether the array is too large to be addressed. 3470 unsigned ActiveSizeBits 3471 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3472 Res); 3473 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3474 Oversized = Res; 3475 return QualType(); 3476 } 3477 3478 return Context.getConstantArrayType(VLATy->getElementType(), 3479 Res, ArrayType::Normal, 0); 3480} 3481 3482/// \brief Register the given locally-scoped external C declaration so 3483/// that it can be found later for redeclarations 3484void 3485Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3486 const LookupResult &Previous, 3487 Scope *S) { 3488 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3489 "Decl is not a locally-scoped decl!"); 3490 // Note that we have a locally-scoped external with this name. 3491 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3492 3493 if (!Previous.isSingleResult()) 3494 return; 3495 3496 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3497 3498 // If there was a previous declaration of this variable, it may be 3499 // in our identifier chain. Update the identifier chain with the new 3500 // declaration. 3501 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3502 // The previous declaration was found on the identifer resolver 3503 // chain, so remove it from its scope. 3504 3505 if (S->isDeclScope(PrevDecl)) { 3506 // Special case for redeclarations in the SAME scope. 3507 // Because this declaration is going to be added to the identifier chain 3508 // later, we should temporarily take it OFF the chain. 3509 IdResolver.RemoveDecl(ND); 3510 3511 } else { 3512 // Find the scope for the original declaration. 3513 while (S && !S->isDeclScope(PrevDecl)) 3514 S = S->getParent(); 3515 } 3516 3517 if (S) 3518 S->RemoveDecl(PrevDecl); 3519 } 3520} 3521 3522llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3523Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3524 if (ExternalSource) { 3525 // Load locally-scoped external decls from the external source. 3526 SmallVector<NamedDecl *, 4> Decls; 3527 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3528 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3529 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3530 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3531 if (Pos == LocallyScopedExternalDecls.end()) 3532 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3533 } 3534 } 3535 3536 return LocallyScopedExternalDecls.find(Name); 3537} 3538 3539/// \brief Diagnose function specifiers on a declaration of an identifier that 3540/// does not identify a function. 3541void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3542 // FIXME: We should probably indicate the identifier in question to avoid 3543 // confusion for constructs like "inline int a(), b;" 3544 if (D.getDeclSpec().isInlineSpecified()) 3545 Diag(D.getDeclSpec().getInlineSpecLoc(), 3546 diag::err_inline_non_function); 3547 3548 if (D.getDeclSpec().isVirtualSpecified()) 3549 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3550 diag::err_virtual_non_function); 3551 3552 if (D.getDeclSpec().isExplicitSpecified()) 3553 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3554 diag::err_explicit_non_function); 3555} 3556 3557NamedDecl* 3558Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3559 TypeSourceInfo *TInfo, LookupResult &Previous) { 3560 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3561 if (D.getCXXScopeSpec().isSet()) { 3562 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3563 << D.getCXXScopeSpec().getRange(); 3564 D.setInvalidType(); 3565 // Pretend we didn't see the scope specifier. 3566 DC = CurContext; 3567 Previous.clear(); 3568 } 3569 3570 if (getLangOptions().CPlusPlus) { 3571 // Check that there are no default arguments (C++ only). 3572 CheckExtraCXXDefaultArguments(D); 3573 } 3574 3575 DiagnoseFunctionSpecifiers(D); 3576 3577 if (D.getDeclSpec().isThreadSpecified()) 3578 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3579 if (D.getDeclSpec().isConstexprSpecified()) 3580 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3581 << 1; 3582 3583 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3584 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3585 << D.getName().getSourceRange(); 3586 return 0; 3587 } 3588 3589 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3590 if (!NewTD) return 0; 3591 3592 // Handle attributes prior to checking for duplicates in MergeVarDecl 3593 ProcessDeclAttributes(S, NewTD, D); 3594 3595 CheckTypedefForVariablyModifiedType(S, NewTD); 3596 3597 bool Redeclaration = D.isRedeclaration(); 3598 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3599 D.setRedeclaration(Redeclaration); 3600 return ND; 3601} 3602 3603void 3604Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3605 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3606 // then it shall have block scope. 3607 // Note that variably modified types must be fixed before merging the decl so 3608 // that redeclarations will match. 3609 QualType T = NewTD->getUnderlyingType(); 3610 if (T->isVariablyModifiedType()) { 3611 getCurFunction()->setHasBranchProtectedScope(); 3612 3613 if (S->getFnParent() == 0) { 3614 bool SizeIsNegative; 3615 llvm::APSInt Oversized; 3616 QualType FixedTy = 3617 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3618 Oversized); 3619 if (!FixedTy.isNull()) { 3620 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3621 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3622 } else { 3623 if (SizeIsNegative) 3624 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3625 else if (T->isVariableArrayType()) 3626 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3627 else if (Oversized.getBoolValue()) 3628 Diag(NewTD->getLocation(), diag::err_array_too_large) 3629 << Oversized.toString(10); 3630 else 3631 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3632 NewTD->setInvalidDecl(); 3633 } 3634 } 3635 } 3636} 3637 3638 3639/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3640/// declares a typedef-name, either using the 'typedef' type specifier or via 3641/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3642NamedDecl* 3643Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3644 LookupResult &Previous, bool &Redeclaration) { 3645 // Merge the decl with the existing one if appropriate. If the decl is 3646 // in an outer scope, it isn't the same thing. 3647 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3648 /*ExplicitInstantiationOrSpecialization=*/false); 3649 if (!Previous.empty()) { 3650 Redeclaration = true; 3651 MergeTypedefNameDecl(NewTD, Previous); 3652 } 3653 3654 // If this is the C FILE type, notify the AST context. 3655 if (IdentifierInfo *II = NewTD->getIdentifier()) 3656 if (!NewTD->isInvalidDecl() && 3657 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3658 if (II->isStr("FILE")) 3659 Context.setFILEDecl(NewTD); 3660 else if (II->isStr("jmp_buf")) 3661 Context.setjmp_bufDecl(NewTD); 3662 else if (II->isStr("sigjmp_buf")) 3663 Context.setsigjmp_bufDecl(NewTD); 3664 else if (II->isStr("__builtin_va_list")) 3665 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3666 } 3667 3668 return NewTD; 3669} 3670 3671/// \brief Determines whether the given declaration is an out-of-scope 3672/// previous declaration. 3673/// 3674/// This routine should be invoked when name lookup has found a 3675/// previous declaration (PrevDecl) that is not in the scope where a 3676/// new declaration by the same name is being introduced. If the new 3677/// declaration occurs in a local scope, previous declarations with 3678/// linkage may still be considered previous declarations (C99 3679/// 6.2.2p4-5, C++ [basic.link]p6). 3680/// 3681/// \param PrevDecl the previous declaration found by name 3682/// lookup 3683/// 3684/// \param DC the context in which the new declaration is being 3685/// declared. 3686/// 3687/// \returns true if PrevDecl is an out-of-scope previous declaration 3688/// for a new delcaration with the same name. 3689static bool 3690isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3691 ASTContext &Context) { 3692 if (!PrevDecl) 3693 return false; 3694 3695 if (!PrevDecl->hasLinkage()) 3696 return false; 3697 3698 if (Context.getLangOptions().CPlusPlus) { 3699 // C++ [basic.link]p6: 3700 // If there is a visible declaration of an entity with linkage 3701 // having the same name and type, ignoring entities declared 3702 // outside the innermost enclosing namespace scope, the block 3703 // scope declaration declares that same entity and receives the 3704 // linkage of the previous declaration. 3705 DeclContext *OuterContext = DC->getRedeclContext(); 3706 if (!OuterContext->isFunctionOrMethod()) 3707 // This rule only applies to block-scope declarations. 3708 return false; 3709 3710 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3711 if (PrevOuterContext->isRecord()) 3712 // We found a member function: ignore it. 3713 return false; 3714 3715 // Find the innermost enclosing namespace for the new and 3716 // previous declarations. 3717 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3718 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3719 3720 // The previous declaration is in a different namespace, so it 3721 // isn't the same function. 3722 if (!OuterContext->Equals(PrevOuterContext)) 3723 return false; 3724 } 3725 3726 return true; 3727} 3728 3729static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3730 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3731 if (!SS.isSet()) return; 3732 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3733} 3734 3735bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3736 QualType type = decl->getType(); 3737 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3738 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3739 // Various kinds of declaration aren't allowed to be __autoreleasing. 3740 unsigned kind = -1U; 3741 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3742 if (var->hasAttr<BlocksAttr>()) 3743 kind = 0; // __block 3744 else if (!var->hasLocalStorage()) 3745 kind = 1; // global 3746 } else if (isa<ObjCIvarDecl>(decl)) { 3747 kind = 3; // ivar 3748 } else if (isa<FieldDecl>(decl)) { 3749 kind = 2; // field 3750 } 3751 3752 if (kind != -1U) { 3753 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3754 << kind; 3755 } 3756 } else if (lifetime == Qualifiers::OCL_None) { 3757 // Try to infer lifetime. 3758 if (!type->isObjCLifetimeType()) 3759 return false; 3760 3761 lifetime = type->getObjCARCImplicitLifetime(); 3762 type = Context.getLifetimeQualifiedType(type, lifetime); 3763 decl->setType(type); 3764 } 3765 3766 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3767 // Thread-local variables cannot have lifetime. 3768 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3769 var->isThreadSpecified()) { 3770 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3771 << var->getType(); 3772 return true; 3773 } 3774 } 3775 3776 return false; 3777} 3778 3779NamedDecl* 3780Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3781 TypeSourceInfo *TInfo, LookupResult &Previous, 3782 MultiTemplateParamsArg TemplateParamLists) { 3783 QualType R = TInfo->getType(); 3784 DeclarationName Name = GetNameForDeclarator(D).getName(); 3785 3786 // Check that there are no default arguments (C++ only). 3787 if (getLangOptions().CPlusPlus) 3788 CheckExtraCXXDefaultArguments(D); 3789 3790 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3791 assert(SCSpec != DeclSpec::SCS_typedef && 3792 "Parser allowed 'typedef' as storage class VarDecl."); 3793 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3794 if (SCSpec == DeclSpec::SCS_mutable) { 3795 // mutable can only appear on non-static class members, so it's always 3796 // an error here 3797 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3798 D.setInvalidType(); 3799 SC = SC_None; 3800 } 3801 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3802 VarDecl::StorageClass SCAsWritten 3803 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3804 3805 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3806 if (!II) { 3807 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3808 << Name; 3809 return 0; 3810 } 3811 3812 DiagnoseFunctionSpecifiers(D); 3813 3814 if (!DC->isRecord() && S->getFnParent() == 0) { 3815 // C99 6.9p2: The storage-class specifiers auto and register shall not 3816 // appear in the declaration specifiers in an external declaration. 3817 if (SC == SC_Auto || SC == SC_Register) { 3818 3819 // If this is a register variable with an asm label specified, then this 3820 // is a GNU extension. 3821 if (SC == SC_Register && D.getAsmLabel()) 3822 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3823 else 3824 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3825 D.setInvalidType(); 3826 } 3827 } 3828 3829 if (getLangOptions().OpenCL) { 3830 // Set up the special work-group-local storage class for variables in the 3831 // OpenCL __local address space. 3832 if (R.getAddressSpace() == LangAS::opencl_local) 3833 SC = SC_OpenCLWorkGroupLocal; 3834 } 3835 3836 bool isExplicitSpecialization = false; 3837 VarDecl *NewVD; 3838 if (!getLangOptions().CPlusPlus) { 3839 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3840 D.getIdentifierLoc(), II, 3841 R, TInfo, SC, SCAsWritten); 3842 3843 if (D.isInvalidType()) 3844 NewVD->setInvalidDecl(); 3845 } else { 3846 if (DC->isRecord() && !CurContext->isRecord()) { 3847 // This is an out-of-line definition of a static data member. 3848 if (SC == SC_Static) { 3849 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3850 diag::err_static_out_of_line) 3851 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3852 } else if (SC == SC_None) 3853 SC = SC_Static; 3854 } 3855 if (SC == SC_Static) { 3856 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3857 if (RD->isLocalClass()) 3858 Diag(D.getIdentifierLoc(), 3859 diag::err_static_data_member_not_allowed_in_local_class) 3860 << Name << RD->getDeclName(); 3861 3862 // C++ [class.union]p1: If a union contains a static data member, 3863 // the program is ill-formed. 3864 // 3865 // We also disallow static data members in anonymous structs. 3866 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3867 Diag(D.getIdentifierLoc(), 3868 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3869 << Name << RD->isUnion(); 3870 } 3871 } 3872 3873 // Match up the template parameter lists with the scope specifier, then 3874 // determine whether we have a template or a template specialization. 3875 isExplicitSpecialization = false; 3876 bool Invalid = false; 3877 if (TemplateParameterList *TemplateParams 3878 = MatchTemplateParametersToScopeSpecifier( 3879 D.getDeclSpec().getSourceRange().getBegin(), 3880 D.getIdentifierLoc(), 3881 D.getCXXScopeSpec(), 3882 TemplateParamLists.get(), 3883 TemplateParamLists.size(), 3884 /*never a friend*/ false, 3885 isExplicitSpecialization, 3886 Invalid)) { 3887 if (TemplateParams->size() > 0) { 3888 // There is no such thing as a variable template. 3889 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3890 << II 3891 << SourceRange(TemplateParams->getTemplateLoc(), 3892 TemplateParams->getRAngleLoc()); 3893 return 0; 3894 } else { 3895 // There is an extraneous 'template<>' for this variable. Complain 3896 // about it, but allow the declaration of the variable. 3897 Diag(TemplateParams->getTemplateLoc(), 3898 diag::err_template_variable_noparams) 3899 << II 3900 << SourceRange(TemplateParams->getTemplateLoc(), 3901 TemplateParams->getRAngleLoc()); 3902 } 3903 } 3904 3905 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3906 D.getIdentifierLoc(), II, 3907 R, TInfo, SC, SCAsWritten); 3908 3909 // If this decl has an auto type in need of deduction, make a note of the 3910 // Decl so we can diagnose uses of it in its own initializer. 3911 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3912 R->getContainedAutoType()) 3913 ParsingInitForAutoVars.insert(NewVD); 3914 3915 if (D.isInvalidType() || Invalid) 3916 NewVD->setInvalidDecl(); 3917 3918 SetNestedNameSpecifier(NewVD, D); 3919 3920 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3921 NewVD->setTemplateParameterListsInfo(Context, 3922 TemplateParamLists.size(), 3923 TemplateParamLists.release()); 3924 } 3925 3926 if (D.getDeclSpec().isConstexprSpecified()) { 3927 // FIXME: once we know whether there's an initializer, apply this to 3928 // static data members too. 3929 if (!NewVD->isStaticDataMember() && 3930 !NewVD->isThisDeclarationADefinition()) { 3931 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3932 // of a variable. Suggest replacing it with 'const' if appropriate. 3933 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3934 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3935 // If the declarator is complex, we need to move the keyword to the 3936 // innermost chunk as we switch it from 'constexpr' to 'const'. 3937 int Kind = DeclaratorChunk::Paren; 3938 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3939 Kind = D.getTypeObject(I).Kind; 3940 if (Kind != DeclaratorChunk::Paren) 3941 break; 3942 } 3943 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3944 Kind == DeclaratorChunk::Reference) 3945 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3946 << FixItHint::CreateRemoval(ConstexprRange); 3947 else if (Kind == DeclaratorChunk::Paren) 3948 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3949 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3950 else 3951 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3952 << FixItHint::CreateRemoval(ConstexprRange) 3953 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3954 } else { 3955 NewVD->setConstexpr(true); 3956 } 3957 } 3958 } 3959 3960 // Set the lexical context. If the declarator has a C++ scope specifier, the 3961 // lexical context will be different from the semantic context. 3962 NewVD->setLexicalDeclContext(CurContext); 3963 3964 if (D.getDeclSpec().isThreadSpecified()) { 3965 if (NewVD->hasLocalStorage()) 3966 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3967 else if (!Context.getTargetInfo().isTLSSupported()) 3968 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3969 else 3970 NewVD->setThreadSpecified(true); 3971 } 3972 3973 if (D.getDeclSpec().isModulePrivateSpecified()) { 3974 if (isExplicitSpecialization) 3975 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3976 << 2 3977 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3978 else if (NewVD->hasLocalStorage()) 3979 Diag(NewVD->getLocation(), diag::err_module_private_local) 3980 << 0 << NewVD->getDeclName() 3981 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3982 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3983 else 3984 NewVD->setModulePrivate(); 3985 } 3986 3987 // Handle attributes prior to checking for duplicates in MergeVarDecl 3988 ProcessDeclAttributes(S, NewVD, D); 3989 3990 // In auto-retain/release, infer strong retension for variables of 3991 // retainable type. 3992 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3993 NewVD->setInvalidDecl(); 3994 3995 // Handle GNU asm-label extension (encoded as an attribute). 3996 if (Expr *E = (Expr*)D.getAsmLabel()) { 3997 // The parser guarantees this is a string. 3998 StringLiteral *SE = cast<StringLiteral>(E); 3999 StringRef Label = SE->getString(); 4000 if (S->getFnParent() != 0) { 4001 switch (SC) { 4002 case SC_None: 4003 case SC_Auto: 4004 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4005 break; 4006 case SC_Register: 4007 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4008 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4009 break; 4010 case SC_Static: 4011 case SC_Extern: 4012 case SC_PrivateExtern: 4013 case SC_OpenCLWorkGroupLocal: 4014 break; 4015 } 4016 } 4017 4018 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4019 Context, Label)); 4020 } 4021 4022 // Diagnose shadowed variables before filtering for scope. 4023 if (!D.getCXXScopeSpec().isSet()) 4024 CheckShadow(S, NewVD, Previous); 4025 4026 // Don't consider existing declarations that are in a different 4027 // scope and are out-of-semantic-context declarations (if the new 4028 // declaration has linkage). 4029 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4030 isExplicitSpecialization); 4031 4032 if (!getLangOptions().CPlusPlus) { 4033 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4034 } else { 4035 // Merge the decl with the existing one if appropriate. 4036 if (!Previous.empty()) { 4037 if (Previous.isSingleResult() && 4038 isa<FieldDecl>(Previous.getFoundDecl()) && 4039 D.getCXXScopeSpec().isSet()) { 4040 // The user tried to define a non-static data member 4041 // out-of-line (C++ [dcl.meaning]p1). 4042 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4043 << D.getCXXScopeSpec().getRange(); 4044 Previous.clear(); 4045 NewVD->setInvalidDecl(); 4046 } 4047 } else if (D.getCXXScopeSpec().isSet()) { 4048 // No previous declaration in the qualifying scope. 4049 Diag(D.getIdentifierLoc(), diag::err_no_member) 4050 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4051 << D.getCXXScopeSpec().getRange(); 4052 NewVD->setInvalidDecl(); 4053 } 4054 4055 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4056 4057 // This is an explicit specialization of a static data member. Check it. 4058 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4059 CheckMemberSpecialization(NewVD, Previous)) 4060 NewVD->setInvalidDecl(); 4061 } 4062 4063 // attributes declared post-definition are currently ignored 4064 // FIXME: This should be handled in attribute merging, not 4065 // here. 4066 if (Previous.isSingleResult()) { 4067 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4068 if (Def && (Def = Def->getDefinition()) && 4069 Def != NewVD && D.hasAttributes()) { 4070 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4071 Diag(Def->getLocation(), diag::note_previous_definition); 4072 } 4073 } 4074 4075 // If this is a locally-scoped extern C variable, update the map of 4076 // such variables. 4077 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4078 !NewVD->isInvalidDecl()) 4079 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4080 4081 // If there's a #pragma GCC visibility in scope, and this isn't a class 4082 // member, set the visibility of this variable. 4083 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4084 AddPushedVisibilityAttribute(NewVD); 4085 4086 MarkUnusedFileScopedDecl(NewVD); 4087 4088 return NewVD; 4089} 4090 4091/// \brief Diagnose variable or built-in function shadowing. Implements 4092/// -Wshadow. 4093/// 4094/// This method is called whenever a VarDecl is added to a "useful" 4095/// scope. 4096/// 4097/// \param S the scope in which the shadowing name is being declared 4098/// \param R the lookup of the name 4099/// 4100void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4101 // Return if warning is ignored. 4102 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4103 DiagnosticsEngine::Ignored) 4104 return; 4105 4106 // Don't diagnose declarations at file scope. 4107 if (D->hasGlobalStorage()) 4108 return; 4109 4110 DeclContext *NewDC = D->getDeclContext(); 4111 4112 // Only diagnose if we're shadowing an unambiguous field or variable. 4113 if (R.getResultKind() != LookupResult::Found) 4114 return; 4115 4116 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4117 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4118 return; 4119 4120 // Fields are not shadowed by variables in C++ static methods. 4121 if (isa<FieldDecl>(ShadowedDecl)) 4122 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4123 if (MD->isStatic()) 4124 return; 4125 4126 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4127 if (shadowedVar->isExternC()) { 4128 // For shadowing external vars, make sure that we point to the global 4129 // declaration, not a locally scoped extern declaration. 4130 for (VarDecl::redecl_iterator 4131 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4132 I != E; ++I) 4133 if (I->isFileVarDecl()) { 4134 ShadowedDecl = *I; 4135 break; 4136 } 4137 } 4138 4139 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4140 4141 // Only warn about certain kinds of shadowing for class members. 4142 if (NewDC && NewDC->isRecord()) { 4143 // In particular, don't warn about shadowing non-class members. 4144 if (!OldDC->isRecord()) 4145 return; 4146 4147 // TODO: should we warn about static data members shadowing 4148 // static data members from base classes? 4149 4150 // TODO: don't diagnose for inaccessible shadowed members. 4151 // This is hard to do perfectly because we might friend the 4152 // shadowing context, but that's just a false negative. 4153 } 4154 4155 // Determine what kind of declaration we're shadowing. 4156 unsigned Kind; 4157 if (isa<RecordDecl>(OldDC)) { 4158 if (isa<FieldDecl>(ShadowedDecl)) 4159 Kind = 3; // field 4160 else 4161 Kind = 2; // static data member 4162 } else if (OldDC->isFileContext()) 4163 Kind = 1; // global 4164 else 4165 Kind = 0; // local 4166 4167 DeclarationName Name = R.getLookupName(); 4168 4169 // Emit warning and note. 4170 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4171 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4172} 4173 4174/// \brief Check -Wshadow without the advantage of a previous lookup. 4175void Sema::CheckShadow(Scope *S, VarDecl *D) { 4176 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4177 DiagnosticsEngine::Ignored) 4178 return; 4179 4180 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4181 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4182 LookupName(R, S); 4183 CheckShadow(S, D, R); 4184} 4185 4186/// \brief Perform semantic checking on a newly-created variable 4187/// declaration. 4188/// 4189/// This routine performs all of the type-checking required for a 4190/// variable declaration once it has been built. It is used both to 4191/// check variables after they have been parsed and their declarators 4192/// have been translated into a declaration, and to check variables 4193/// that have been instantiated from a template. 4194/// 4195/// Sets NewVD->isInvalidDecl() if an error was encountered. 4196/// 4197/// Returns true if the variable declaration is a redeclaration. 4198bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4199 LookupResult &Previous) { 4200 // If the decl is already known invalid, don't check it. 4201 if (NewVD->isInvalidDecl()) 4202 return false; 4203 4204 QualType T = NewVD->getType(); 4205 4206 if (T->isObjCObjectType()) { 4207 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4208 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4209 T = Context.getObjCObjectPointerType(T); 4210 NewVD->setType(T); 4211 } 4212 4213 // Emit an error if an address space was applied to decl with local storage. 4214 // This includes arrays of objects with address space qualifiers, but not 4215 // automatic variables that point to other address spaces. 4216 // ISO/IEC TR 18037 S5.1.2 4217 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4218 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4219 NewVD->setInvalidDecl(); 4220 return false; 4221 } 4222 4223 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4224 && !NewVD->hasAttr<BlocksAttr>()) { 4225 if (getLangOptions().getGC() != LangOptions::NonGC) 4226 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4227 else 4228 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4229 } 4230 4231 bool isVM = T->isVariablyModifiedType(); 4232 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4233 NewVD->hasAttr<BlocksAttr>()) 4234 getCurFunction()->setHasBranchProtectedScope(); 4235 4236 if ((isVM && NewVD->hasLinkage()) || 4237 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4238 bool SizeIsNegative; 4239 llvm::APSInt Oversized; 4240 QualType FixedTy = 4241 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4242 Oversized); 4243 4244 if (FixedTy.isNull() && T->isVariableArrayType()) { 4245 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4246 // FIXME: This won't give the correct result for 4247 // int a[10][n]; 4248 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4249 4250 if (NewVD->isFileVarDecl()) 4251 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4252 << SizeRange; 4253 else if (NewVD->getStorageClass() == SC_Static) 4254 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4255 << SizeRange; 4256 else 4257 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4258 << SizeRange; 4259 NewVD->setInvalidDecl(); 4260 return false; 4261 } 4262 4263 if (FixedTy.isNull()) { 4264 if (NewVD->isFileVarDecl()) 4265 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4266 else 4267 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4268 NewVD->setInvalidDecl(); 4269 return false; 4270 } 4271 4272 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4273 NewVD->setType(FixedTy); 4274 } 4275 4276 if (Previous.empty() && NewVD->isExternC()) { 4277 // Since we did not find anything by this name and we're declaring 4278 // an extern "C" variable, look for a non-visible extern "C" 4279 // declaration with the same name. 4280 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4281 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4282 if (Pos != LocallyScopedExternalDecls.end()) 4283 Previous.addDecl(Pos->second); 4284 } 4285 4286 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4287 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4288 << T; 4289 NewVD->setInvalidDecl(); 4290 return false; 4291 } 4292 4293 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4294 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4295 NewVD->setInvalidDecl(); 4296 return false; 4297 } 4298 4299 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4300 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4301 NewVD->setInvalidDecl(); 4302 return false; 4303 } 4304 4305 // Function pointers and references cannot have qualified function type, only 4306 // function pointer-to-members can do that. 4307 QualType Pointee; 4308 unsigned PtrOrRef = 0; 4309 if (const PointerType *Ptr = T->getAs<PointerType>()) 4310 Pointee = Ptr->getPointeeType(); 4311 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4312 Pointee = Ref->getPointeeType(); 4313 PtrOrRef = 1; 4314 } 4315 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4316 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4317 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4318 << PtrOrRef; 4319 NewVD->setInvalidDecl(); 4320 return false; 4321 } 4322 4323 if (!Previous.empty()) { 4324 MergeVarDecl(NewVD, Previous); 4325 return true; 4326 } 4327 return false; 4328} 4329 4330/// \brief Data used with FindOverriddenMethod 4331struct FindOverriddenMethodData { 4332 Sema *S; 4333 CXXMethodDecl *Method; 4334}; 4335 4336/// \brief Member lookup function that determines whether a given C++ 4337/// method overrides a method in a base class, to be used with 4338/// CXXRecordDecl::lookupInBases(). 4339static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4340 CXXBasePath &Path, 4341 void *UserData) { 4342 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4343 4344 FindOverriddenMethodData *Data 4345 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4346 4347 DeclarationName Name = Data->Method->getDeclName(); 4348 4349 // FIXME: Do we care about other names here too? 4350 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4351 // We really want to find the base class destructor here. 4352 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4353 CanQualType CT = Data->S->Context.getCanonicalType(T); 4354 4355 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4356 } 4357 4358 for (Path.Decls = BaseRecord->lookup(Name); 4359 Path.Decls.first != Path.Decls.second; 4360 ++Path.Decls.first) { 4361 NamedDecl *D = *Path.Decls.first; 4362 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4363 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4364 return true; 4365 } 4366 } 4367 4368 return false; 4369} 4370 4371/// AddOverriddenMethods - See if a method overrides any in the base classes, 4372/// and if so, check that it's a valid override and remember it. 4373bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4374 // Look for virtual methods in base classes that this method might override. 4375 CXXBasePaths Paths; 4376 FindOverriddenMethodData Data; 4377 Data.Method = MD; 4378 Data.S = this; 4379 bool AddedAny = false; 4380 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4381 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4382 E = Paths.found_decls_end(); I != E; ++I) { 4383 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4384 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4385 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4386 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4387 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4388 AddedAny = true; 4389 } 4390 } 4391 } 4392 } 4393 4394 return AddedAny; 4395} 4396 4397namespace { 4398 // Struct for holding all of the extra arguments needed by 4399 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4400 struct ActOnFDArgs { 4401 Scope *S; 4402 Declarator &D; 4403 MultiTemplateParamsArg TemplateParamLists; 4404 bool AddToScope; 4405 }; 4406} 4407 4408/// \brief Generate diagnostics for an invalid function redeclaration. 4409/// 4410/// This routine handles generating the diagnostic messages for an invalid 4411/// function redeclaration, including finding possible similar declarations 4412/// or performing typo correction if there are no previous declarations with 4413/// the same name. 4414/// 4415/// Returns a NamedDecl iff typo correction was performed and substituting in 4416/// the new declaration name does not cause new errors. 4417static NamedDecl* DiagnoseInvalidRedeclaration( 4418 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4419 ActOnFDArgs &ExtraArgs) { 4420 NamedDecl *Result = NULL; 4421 DeclarationName Name = NewFD->getDeclName(); 4422 DeclContext *NewDC = NewFD->getDeclContext(); 4423 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4424 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4425 llvm::SmallVector<unsigned, 1> MismatchedParams; 4426 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4427 TypoCorrection Correction; 4428 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4429 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4430 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4431 : diag::err_member_def_does_not_match; 4432 4433 NewFD->setInvalidDecl(); 4434 SemaRef.LookupQualifiedName(Prev, NewDC); 4435 assert(!Prev.isAmbiguous() && 4436 "Cannot have an ambiguity in previous-declaration lookup"); 4437 if (!Prev.empty()) { 4438 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4439 Func != FuncEnd; ++Func) { 4440 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4441 if (FD && 4442 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4443 // Add 1 to the index so that 0 can mean the mismatch didn't 4444 // involve a parameter 4445 unsigned ParamNum = 4446 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4447 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4448 } 4449 } 4450 // If the qualified name lookup yielded nothing, try typo correction 4451 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4452 Prev.getLookupKind(), 0, 0, NewDC)) && 4453 Correction.getCorrection() != Name) { 4454 // Trap errors. 4455 Sema::SFINAETrap Trap(SemaRef); 4456 4457 // Set up everything for the call to ActOnFunctionDeclarator 4458 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4459 ExtraArgs.D.getIdentifierLoc()); 4460 Previous.clear(); 4461 Previous.setLookupName(Correction.getCorrection()); 4462 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4463 CDeclEnd = Correction.end(); 4464 CDecl != CDeclEnd; ++CDecl) { 4465 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4466 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4467 MismatchedParams)) { 4468 Previous.addDecl(FD); 4469 } 4470 } 4471 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4472 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4473 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4474 // eliminate the need for the parameter pack ExtraArgs. 4475 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4476 NewFD->getDeclContext(), 4477 NewFD->getTypeSourceInfo(), 4478 Previous, 4479 ExtraArgs.TemplateParamLists, 4480 ExtraArgs.AddToScope); 4481 if (Trap.hasErrorOccurred()) { 4482 // Pretend the typo correction never occurred 4483 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4484 ExtraArgs.D.getIdentifierLoc()); 4485 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4486 Previous.clear(); 4487 Previous.setLookupName(Name); 4488 Result = NULL; 4489 } else { 4490 for (LookupResult::iterator Func = Previous.begin(), 4491 FuncEnd = Previous.end(); 4492 Func != FuncEnd; ++Func) { 4493 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4494 NearMatches.push_back(std::make_pair(FD, 0)); 4495 } 4496 } 4497 if (NearMatches.empty()) { 4498 // Ignore the correction if it didn't yield any close FunctionDecl matches 4499 Correction = TypoCorrection(); 4500 } else { 4501 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4502 : diag::err_member_def_does_not_match_suggest; 4503 } 4504 } 4505 4506 if (Correction) 4507 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4508 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4509 << FixItHint::CreateReplacement( 4510 NewFD->getLocation(), 4511 Correction.getAsString(SemaRef.getLangOptions())); 4512 else 4513 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4514 << Name << NewDC << NewFD->getLocation(); 4515 4516 bool NewFDisConst = false; 4517 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4518 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4519 4520 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4521 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4522 NearMatch != NearMatchEnd; ++NearMatch) { 4523 FunctionDecl *FD = NearMatch->first; 4524 bool FDisConst = false; 4525 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4526 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4527 4528 if (unsigned Idx = NearMatch->second) { 4529 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4530 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4531 diag::note_member_def_close_param_match) 4532 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4533 } else if (Correction) { 4534 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4535 << Correction.getQuoted(SemaRef.getLangOptions()); 4536 } else if (FDisConst != NewFDisConst) { 4537 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4538 << NewFDisConst << FD->getSourceRange().getEnd(); 4539 } else 4540 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4541 } 4542 return Result; 4543} 4544 4545static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4546 Declarator &D) { 4547 switch (D.getDeclSpec().getStorageClassSpec()) { 4548 default: llvm_unreachable("Unknown storage class!"); 4549 case DeclSpec::SCS_auto: 4550 case DeclSpec::SCS_register: 4551 case DeclSpec::SCS_mutable: 4552 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4553 diag::err_typecheck_sclass_func); 4554 D.setInvalidType(); 4555 break; 4556 case DeclSpec::SCS_unspecified: break; 4557 case DeclSpec::SCS_extern: return SC_Extern; 4558 case DeclSpec::SCS_static: { 4559 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4560 // C99 6.7.1p5: 4561 // The declaration of an identifier for a function that has 4562 // block scope shall have no explicit storage-class specifier 4563 // other than extern 4564 // See also (C++ [dcl.stc]p4). 4565 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4566 diag::err_static_block_func); 4567 break; 4568 } else 4569 return SC_Static; 4570 } 4571 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4572 } 4573 4574 // No explicit storage class has already been returned 4575 return SC_None; 4576} 4577 4578static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4579 DeclContext *DC, QualType &R, 4580 TypeSourceInfo *TInfo, 4581 FunctionDecl::StorageClass SC, 4582 bool &IsVirtualOkay) { 4583 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4584 DeclarationName Name = NameInfo.getName(); 4585 4586 FunctionDecl *NewFD = 0; 4587 bool isInline = D.getDeclSpec().isInlineSpecified(); 4588 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4589 FunctionDecl::StorageClass SCAsWritten 4590 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4591 4592 if (!SemaRef.getLangOptions().CPlusPlus) { 4593 // Determine whether the function was written with a 4594 // prototype. This true when: 4595 // - there is a prototype in the declarator, or 4596 // - the type R of the function is some kind of typedef or other reference 4597 // to a type name (which eventually refers to a function type). 4598 bool HasPrototype = 4599 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4600 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4601 4602 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4603 D.getSourceRange().getBegin(), NameInfo, R, 4604 TInfo, SC, SCAsWritten, isInline, 4605 HasPrototype); 4606 if (D.isInvalidType()) 4607 NewFD->setInvalidDecl(); 4608 4609 // Set the lexical context. 4610 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4611 4612 return NewFD; 4613 } 4614 4615 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4616 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4617 4618 // Check that the return type is not an abstract class type. 4619 // For record types, this is done by the AbstractClassUsageDiagnoser once 4620 // the class has been completely parsed. 4621 if (!DC->isRecord() && 4622 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4623 R->getAs<FunctionType>()->getResultType(), 4624 diag::err_abstract_type_in_decl, 4625 SemaRef.AbstractReturnType)) 4626 D.setInvalidType(); 4627 4628 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4629 // This is a C++ constructor declaration. 4630 assert(DC->isRecord() && 4631 "Constructors can only be declared in a member context"); 4632 4633 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4634 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4635 D.getSourceRange().getBegin(), NameInfo, 4636 R, TInfo, isExplicit, isInline, 4637 /*isImplicitlyDeclared=*/false, 4638 isConstexpr); 4639 4640 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4641 // This is a C++ destructor declaration. 4642 if (DC->isRecord()) { 4643 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4644 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4645 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4646 SemaRef.Context, Record, 4647 D.getSourceRange().getBegin(), 4648 NameInfo, R, TInfo, isInline, 4649 /*isImplicitlyDeclared=*/false); 4650 4651 // If the class is complete, then we now create the implicit exception 4652 // specification. If the class is incomplete or dependent, we can't do 4653 // it yet. 4654 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4655 Record->getDefinition() && !Record->isBeingDefined() && 4656 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4657 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4658 } 4659 4660 IsVirtualOkay = true; 4661 return NewDD; 4662 4663 } else { 4664 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4665 D.setInvalidType(); 4666 4667 // Create a FunctionDecl to satisfy the function definition parsing 4668 // code path. 4669 return FunctionDecl::Create(SemaRef.Context, DC, 4670 D.getSourceRange().getBegin(), 4671 D.getIdentifierLoc(), Name, R, TInfo, 4672 SC, SCAsWritten, isInline, 4673 /*hasPrototype=*/true, isConstexpr); 4674 } 4675 4676 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4677 if (!DC->isRecord()) { 4678 SemaRef.Diag(D.getIdentifierLoc(), 4679 diag::err_conv_function_not_member); 4680 return 0; 4681 } 4682 4683 SemaRef.CheckConversionDeclarator(D, R, SC); 4684 IsVirtualOkay = true; 4685 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4686 D.getSourceRange().getBegin(), NameInfo, 4687 R, TInfo, isInline, isExplicit, 4688 isConstexpr, SourceLocation()); 4689 4690 } else if (DC->isRecord()) { 4691 // If the name of the function is the same as the name of the record, 4692 // then this must be an invalid constructor that has a return type. 4693 // (The parser checks for a return type and makes the declarator a 4694 // constructor if it has no return type). 4695 if (Name.getAsIdentifierInfo() && 4696 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4697 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4698 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4699 << SourceRange(D.getIdentifierLoc()); 4700 return 0; 4701 } 4702 4703 bool isStatic = SC == SC_Static; 4704 4705 // [class.free]p1: 4706 // Any allocation function for a class T is a static member 4707 // (even if not explicitly declared static). 4708 if (Name.getCXXOverloadedOperator() == OO_New || 4709 Name.getCXXOverloadedOperator() == OO_Array_New) 4710 isStatic = true; 4711 4712 // [class.free]p6 Any deallocation function for a class X is a static member 4713 // (even if not explicitly declared static). 4714 if (Name.getCXXOverloadedOperator() == OO_Delete || 4715 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4716 isStatic = true; 4717 4718 IsVirtualOkay = !isStatic; 4719 4720 // This is a C++ method declaration. 4721 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4722 D.getSourceRange().getBegin(), NameInfo, R, 4723 TInfo, isStatic, SCAsWritten, isInline, 4724 isConstexpr, SourceLocation()); 4725 4726 } else { 4727 // Determine whether the function was written with a 4728 // prototype. This true when: 4729 // - we're in C++ (where every function has a prototype), 4730 return FunctionDecl::Create(SemaRef.Context, DC, 4731 D.getSourceRange().getBegin(), 4732 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4733 true/*HasPrototype*/, isConstexpr); 4734 } 4735} 4736 4737NamedDecl* 4738Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4739 TypeSourceInfo *TInfo, LookupResult &Previous, 4740 MultiTemplateParamsArg TemplateParamLists, 4741 bool &AddToScope) { 4742 QualType R = TInfo->getType(); 4743 4744 assert(R.getTypePtr()->isFunctionType()); 4745 4746 // TODO: consider using NameInfo for diagnostic. 4747 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4748 DeclarationName Name = NameInfo.getName(); 4749 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4750 4751 if (D.getDeclSpec().isThreadSpecified()) 4752 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4753 4754 // Do not allow returning a objc interface by-value. 4755 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4756 Diag(D.getIdentifierLoc(), 4757 diag::err_object_cannot_be_passed_returned_by_value) << 0 4758 << R->getAs<FunctionType>()->getResultType() 4759 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4760 4761 QualType T = R->getAs<FunctionType>()->getResultType(); 4762 T = Context.getObjCObjectPointerType(T); 4763 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4764 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4765 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4766 FPT->getNumArgs(), EPI); 4767 } 4768 else if (isa<FunctionNoProtoType>(R)) 4769 R = Context.getFunctionNoProtoType(T); 4770 } 4771 4772 bool isFriend = false; 4773 FunctionTemplateDecl *FunctionTemplate = 0; 4774 bool isExplicitSpecialization = false; 4775 bool isFunctionTemplateSpecialization = false; 4776 bool isDependentClassScopeExplicitSpecialization = false; 4777 bool isVirtualOkay = false; 4778 4779 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4780 isVirtualOkay); 4781 if (!NewFD) return 0; 4782 4783 if (getLangOptions().CPlusPlus) { 4784 bool isInline = D.getDeclSpec().isInlineSpecified(); 4785 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4786 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4787 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4788 isFriend = D.getDeclSpec().isFriendSpecified(); 4789 if (isFriend && !isInline && D.isFunctionDefinition()) { 4790 // C++ [class.friend]p5 4791 // A function can be defined in a friend declaration of a 4792 // class . . . . Such a function is implicitly inline. 4793 NewFD->setImplicitlyInline(); 4794 } 4795 4796 SetNestedNameSpecifier(NewFD, D); 4797 isExplicitSpecialization = false; 4798 isFunctionTemplateSpecialization = false; 4799 if (D.isInvalidType()) 4800 NewFD->setInvalidDecl(); 4801 4802 // Set the lexical context. If the declarator has a C++ 4803 // scope specifier, or is the object of a friend declaration, the 4804 // lexical context will be different from the semantic context. 4805 NewFD->setLexicalDeclContext(CurContext); 4806 4807 // Match up the template parameter lists with the scope specifier, then 4808 // determine whether we have a template or a template specialization. 4809 bool Invalid = false; 4810 if (TemplateParameterList *TemplateParams 4811 = MatchTemplateParametersToScopeSpecifier( 4812 D.getDeclSpec().getSourceRange().getBegin(), 4813 D.getIdentifierLoc(), 4814 D.getCXXScopeSpec(), 4815 TemplateParamLists.get(), 4816 TemplateParamLists.size(), 4817 isFriend, 4818 isExplicitSpecialization, 4819 Invalid)) { 4820 if (TemplateParams->size() > 0) { 4821 // This is a function template 4822 4823 // Check that we can declare a template here. 4824 if (CheckTemplateDeclScope(S, TemplateParams)) 4825 return 0; 4826 4827 // A destructor cannot be a template. 4828 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4829 Diag(NewFD->getLocation(), diag::err_destructor_template); 4830 return 0; 4831 } 4832 4833 // If we're adding a template to a dependent context, we may need to 4834 // rebuilding some of the types used within the template parameter list, 4835 // now that we know what the current instantiation is. 4836 if (DC->isDependentContext()) { 4837 ContextRAII SavedContext(*this, DC); 4838 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4839 Invalid = true; 4840 } 4841 4842 4843 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4844 NewFD->getLocation(), 4845 Name, TemplateParams, 4846 NewFD); 4847 FunctionTemplate->setLexicalDeclContext(CurContext); 4848 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4849 4850 // For source fidelity, store the other template param lists. 4851 if (TemplateParamLists.size() > 1) { 4852 NewFD->setTemplateParameterListsInfo(Context, 4853 TemplateParamLists.size() - 1, 4854 TemplateParamLists.release()); 4855 } 4856 } else { 4857 // This is a function template specialization. 4858 isFunctionTemplateSpecialization = true; 4859 // For source fidelity, store all the template param lists. 4860 NewFD->setTemplateParameterListsInfo(Context, 4861 TemplateParamLists.size(), 4862 TemplateParamLists.release()); 4863 4864 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4865 if (isFriend) { 4866 // We want to remove the "template<>", found here. 4867 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4868 4869 // If we remove the template<> and the name is not a 4870 // template-id, we're actually silently creating a problem: 4871 // the friend declaration will refer to an untemplated decl, 4872 // and clearly the user wants a template specialization. So 4873 // we need to insert '<>' after the name. 4874 SourceLocation InsertLoc; 4875 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4876 InsertLoc = D.getName().getSourceRange().getEnd(); 4877 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4878 } 4879 4880 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4881 << Name << RemoveRange 4882 << FixItHint::CreateRemoval(RemoveRange) 4883 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4884 } 4885 } 4886 } 4887 else { 4888 // All template param lists were matched against the scope specifier: 4889 // this is NOT (an explicit specialization of) a template. 4890 if (TemplateParamLists.size() > 0) 4891 // For source fidelity, store all the template param lists. 4892 NewFD->setTemplateParameterListsInfo(Context, 4893 TemplateParamLists.size(), 4894 TemplateParamLists.release()); 4895 } 4896 4897 if (Invalid) { 4898 NewFD->setInvalidDecl(); 4899 if (FunctionTemplate) 4900 FunctionTemplate->setInvalidDecl(); 4901 } 4902 4903 // C++ [dcl.fct.spec]p5: 4904 // The virtual specifier shall only be used in declarations of 4905 // nonstatic class member functions that appear within a 4906 // member-specification of a class declaration; see 10.3. 4907 // 4908 if (isVirtual && !NewFD->isInvalidDecl()) { 4909 if (!isVirtualOkay) { 4910 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4911 diag::err_virtual_non_function); 4912 } else if (!CurContext->isRecord()) { 4913 // 'virtual' was specified outside of the class. 4914 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4915 diag::err_virtual_out_of_class) 4916 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4917 } else if (NewFD->getDescribedFunctionTemplate()) { 4918 // C++ [temp.mem]p3: 4919 // A member function template shall not be virtual. 4920 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4921 diag::err_virtual_member_function_template) 4922 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4923 } else { 4924 // Okay: Add virtual to the method. 4925 NewFD->setVirtualAsWritten(true); 4926 } 4927 } 4928 4929 // C++ [dcl.fct.spec]p3: 4930 // The inline specifier shall not appear on a block scope function 4931 // declaration. 4932 if (isInline && !NewFD->isInvalidDecl()) { 4933 if (CurContext->isFunctionOrMethod()) { 4934 // 'inline' is not allowed on block scope function declaration. 4935 Diag(D.getDeclSpec().getInlineSpecLoc(), 4936 diag::err_inline_declaration_block_scope) << Name 4937 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4938 } 4939 } 4940 4941 // C++ [dcl.fct.spec]p6: 4942 // The explicit specifier shall be used only in the declaration of a 4943 // constructor or conversion function within its class definition; 4944 // see 12.3.1 and 12.3.2. 4945 if (isExplicit && !NewFD->isInvalidDecl()) { 4946 if (!CurContext->isRecord()) { 4947 // 'explicit' was specified outside of the class. 4948 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4949 diag::err_explicit_out_of_class) 4950 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4951 } else if (!isa<CXXConstructorDecl>(NewFD) && 4952 !isa<CXXConversionDecl>(NewFD)) { 4953 // 'explicit' was specified on a function that wasn't a constructor 4954 // or conversion function. 4955 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4956 diag::err_explicit_non_ctor_or_conv_function) 4957 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4958 } 4959 } 4960 4961 if (isConstexpr) { 4962 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4963 // are implicitly inline. 4964 NewFD->setImplicitlyInline(); 4965 4966 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4967 // be either constructors or to return a literal type. Therefore, 4968 // destructors cannot be declared constexpr. 4969 if (isa<CXXDestructorDecl>(NewFD)) 4970 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4971 } 4972 4973 // If __module_private__ was specified, mark the function accordingly. 4974 if (D.getDeclSpec().isModulePrivateSpecified()) { 4975 if (isFunctionTemplateSpecialization) { 4976 SourceLocation ModulePrivateLoc 4977 = D.getDeclSpec().getModulePrivateSpecLoc(); 4978 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4979 << 0 4980 << FixItHint::CreateRemoval(ModulePrivateLoc); 4981 } else { 4982 NewFD->setModulePrivate(); 4983 if (FunctionTemplate) 4984 FunctionTemplate->setModulePrivate(); 4985 } 4986 } 4987 4988 if (isFriend) { 4989 // For now, claim that the objects have no previous declaration. 4990 if (FunctionTemplate) { 4991 FunctionTemplate->setObjectOfFriendDecl(false); 4992 FunctionTemplate->setAccess(AS_public); 4993 } 4994 NewFD->setObjectOfFriendDecl(false); 4995 NewFD->setAccess(AS_public); 4996 } 4997 4998 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4999 D.isFunctionDefinition()) { 5000 // A method is implicitly inline if it's defined in its class 5001 // definition. 5002 NewFD->setImplicitlyInline(); 5003 } 5004 5005 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5006 !CurContext->isRecord()) { 5007 // C++ [class.static]p1: 5008 // A data or function member of a class may be declared static 5009 // in a class definition, in which case it is a static member of 5010 // the class. 5011 5012 // Complain about the 'static' specifier if it's on an out-of-line 5013 // member function definition. 5014 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5015 diag::err_static_out_of_line) 5016 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5017 } 5018 } 5019 5020 // Filter out previous declarations that don't match the scope. 5021 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5022 isExplicitSpecialization || 5023 isFunctionTemplateSpecialization); 5024 5025 // Handle GNU asm-label extension (encoded as an attribute). 5026 if (Expr *E = (Expr*) D.getAsmLabel()) { 5027 // The parser guarantees this is a string. 5028 StringLiteral *SE = cast<StringLiteral>(E); 5029 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5030 SE->getString())); 5031 } 5032 5033 // Copy the parameter declarations from the declarator D to the function 5034 // declaration NewFD, if they are available. First scavenge them into Params. 5035 SmallVector<ParmVarDecl*, 16> Params; 5036 if (D.isFunctionDeclarator()) { 5037 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5038 5039 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5040 // function that takes no arguments, not a function that takes a 5041 // single void argument. 5042 // We let through "const void" here because Sema::GetTypeForDeclarator 5043 // already checks for that case. 5044 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5045 FTI.ArgInfo[0].Param && 5046 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5047 // Empty arg list, don't push any params. 5048 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5049 5050 // In C++, the empty parameter-type-list must be spelled "void"; a 5051 // typedef of void is not permitted. 5052 if (getLangOptions().CPlusPlus && 5053 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5054 bool IsTypeAlias = false; 5055 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5056 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5057 else if (const TemplateSpecializationType *TST = 5058 Param->getType()->getAs<TemplateSpecializationType>()) 5059 IsTypeAlias = TST->isTypeAlias(); 5060 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5061 << IsTypeAlias; 5062 } 5063 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5064 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5065 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5066 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5067 Param->setDeclContext(NewFD); 5068 Params.push_back(Param); 5069 5070 if (Param->isInvalidDecl()) 5071 NewFD->setInvalidDecl(); 5072 } 5073 } 5074 5075 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5076 // When we're declaring a function with a typedef, typeof, etc as in the 5077 // following example, we'll need to synthesize (unnamed) 5078 // parameters for use in the declaration. 5079 // 5080 // @code 5081 // typedef void fn(int); 5082 // fn f; 5083 // @endcode 5084 5085 // Synthesize a parameter for each argument type. 5086 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5087 AE = FT->arg_type_end(); AI != AE; ++AI) { 5088 ParmVarDecl *Param = 5089 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5090 Param->setScopeInfo(0, Params.size()); 5091 Params.push_back(Param); 5092 } 5093 } else { 5094 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5095 "Should not need args for typedef of non-prototype fn"); 5096 } 5097 5098 // Finally, we know we have the right number of parameters, install them. 5099 NewFD->setParams(Params); 5100 5101 // Process the non-inheritable attributes on this declaration. 5102 ProcessDeclAttributes(S, NewFD, D, 5103 /*NonInheritable=*/true, /*Inheritable=*/false); 5104 5105 if (!getLangOptions().CPlusPlus) { 5106 // Perform semantic checking on the function declaration. 5107 bool isExplicitSpecialization=false; 5108 if (!NewFD->isInvalidDecl()) { 5109 if (NewFD->getResultType()->isVariablyModifiedType()) { 5110 // Functions returning a variably modified type violate C99 6.7.5.2p2 5111 // because all functions have linkage. 5112 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5113 NewFD->setInvalidDecl(); 5114 } else { 5115 if (NewFD->isMain()) 5116 CheckMain(NewFD, D.getDeclSpec()); 5117 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5118 isExplicitSpecialization)); 5119 } 5120 } 5121 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5122 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5123 "previous declaration set still overloaded"); 5124 } else { 5125 // If the declarator is a template-id, translate the parser's template 5126 // argument list into our AST format. 5127 bool HasExplicitTemplateArgs = false; 5128 TemplateArgumentListInfo TemplateArgs; 5129 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5130 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5131 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5132 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5133 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5134 TemplateId->getTemplateArgs(), 5135 TemplateId->NumArgs); 5136 translateTemplateArguments(TemplateArgsPtr, 5137 TemplateArgs); 5138 TemplateArgsPtr.release(); 5139 5140 HasExplicitTemplateArgs = true; 5141 5142 if (NewFD->isInvalidDecl()) { 5143 HasExplicitTemplateArgs = false; 5144 } else if (FunctionTemplate) { 5145 // Function template with explicit template arguments. 5146 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5147 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5148 5149 HasExplicitTemplateArgs = false; 5150 } else if (!isFunctionTemplateSpecialization && 5151 !D.getDeclSpec().isFriendSpecified()) { 5152 // We have encountered something that the user meant to be a 5153 // specialization (because it has explicitly-specified template 5154 // arguments) but that was not introduced with a "template<>" (or had 5155 // too few of them). 5156 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5157 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5158 << FixItHint::CreateInsertion( 5159 D.getDeclSpec().getSourceRange().getBegin(), 5160 "template<> "); 5161 isFunctionTemplateSpecialization = true; 5162 } else { 5163 // "friend void foo<>(int);" is an implicit specialization decl. 5164 isFunctionTemplateSpecialization = true; 5165 } 5166 } else if (isFriend && isFunctionTemplateSpecialization) { 5167 // This combination is only possible in a recovery case; the user 5168 // wrote something like: 5169 // template <> friend void foo(int); 5170 // which we're recovering from as if the user had written: 5171 // friend void foo<>(int); 5172 // Go ahead and fake up a template id. 5173 HasExplicitTemplateArgs = true; 5174 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5175 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5176 } 5177 5178 // If it's a friend (and only if it's a friend), it's possible 5179 // that either the specialized function type or the specialized 5180 // template is dependent, and therefore matching will fail. In 5181 // this case, don't check the specialization yet. 5182 bool InstantiationDependent = false; 5183 if (isFunctionTemplateSpecialization && isFriend && 5184 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5185 TemplateSpecializationType::anyDependentTemplateArguments( 5186 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5187 InstantiationDependent))) { 5188 assert(HasExplicitTemplateArgs && 5189 "friend function specialization without template args"); 5190 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5191 Previous)) 5192 NewFD->setInvalidDecl(); 5193 } else if (isFunctionTemplateSpecialization) { 5194 if (CurContext->isDependentContext() && CurContext->isRecord() 5195 && !isFriend) { 5196 isDependentClassScopeExplicitSpecialization = true; 5197 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5198 diag::ext_function_specialization_in_class : 5199 diag::err_function_specialization_in_class) 5200 << NewFD->getDeclName(); 5201 } else if (CheckFunctionTemplateSpecialization(NewFD, 5202 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5203 Previous)) 5204 NewFD->setInvalidDecl(); 5205 5206 // C++ [dcl.stc]p1: 5207 // A storage-class-specifier shall not be specified in an explicit 5208 // specialization (14.7.3) 5209 if (SC != SC_None) { 5210 if (SC != NewFD->getStorageClass()) 5211 Diag(NewFD->getLocation(), 5212 diag::err_explicit_specialization_inconsistent_storage_class) 5213 << SC 5214 << FixItHint::CreateRemoval( 5215 D.getDeclSpec().getStorageClassSpecLoc()); 5216 5217 else 5218 Diag(NewFD->getLocation(), 5219 diag::ext_explicit_specialization_storage_class) 5220 << FixItHint::CreateRemoval( 5221 D.getDeclSpec().getStorageClassSpecLoc()); 5222 } 5223 5224 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5225 if (CheckMemberSpecialization(NewFD, Previous)) 5226 NewFD->setInvalidDecl(); 5227 } 5228 5229 // Perform semantic checking on the function declaration. 5230 if (!isDependentClassScopeExplicitSpecialization) { 5231 if (NewFD->isInvalidDecl()) { 5232 // If this is a class member, mark the class invalid immediately. 5233 // This avoids some consistency errors later. 5234 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5235 methodDecl->getParent()->setInvalidDecl(); 5236 } else { 5237 if (NewFD->isMain()) 5238 CheckMain(NewFD, D.getDeclSpec()); 5239 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5240 isExplicitSpecialization)); 5241 } 5242 } 5243 5244 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5245 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5246 "previous declaration set still overloaded"); 5247 5248 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5249 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5250 NewFD->setInvalidDecl(); 5251 5252 NamedDecl *PrincipalDecl = (FunctionTemplate 5253 ? cast<NamedDecl>(FunctionTemplate) 5254 : NewFD); 5255 5256 if (isFriend && D.isRedeclaration()) { 5257 AccessSpecifier Access = AS_public; 5258 if (!NewFD->isInvalidDecl()) 5259 Access = NewFD->getPreviousDeclaration()->getAccess(); 5260 5261 NewFD->setAccess(Access); 5262 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5263 5264 PrincipalDecl->setObjectOfFriendDecl(true); 5265 } 5266 5267 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5268 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5269 PrincipalDecl->setNonMemberOperator(); 5270 5271 // If we have a function template, check the template parameter 5272 // list. This will check and merge default template arguments. 5273 if (FunctionTemplate) { 5274 FunctionTemplateDecl *PrevTemplate = 5275 FunctionTemplate->getPreviousDeclaration(); 5276 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5277 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5278 D.getDeclSpec().isFriendSpecified() 5279 ? (D.isFunctionDefinition() 5280 ? TPC_FriendFunctionTemplateDefinition 5281 : TPC_FriendFunctionTemplate) 5282 : (D.getCXXScopeSpec().isSet() && 5283 DC && DC->isRecord() && 5284 DC->isDependentContext()) 5285 ? TPC_ClassTemplateMember 5286 : TPC_FunctionTemplate); 5287 } 5288 5289 if (NewFD->isInvalidDecl()) { 5290 // Ignore all the rest of this. 5291 } else if (!D.isRedeclaration()) { 5292 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5293 AddToScope }; 5294 // Fake up an access specifier if it's supposed to be a class member. 5295 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5296 NewFD->setAccess(AS_public); 5297 5298 // Qualified decls generally require a previous declaration. 5299 if (D.getCXXScopeSpec().isSet()) { 5300 // ...with the major exception of templated-scope or 5301 // dependent-scope friend declarations. 5302 5303 // TODO: we currently also suppress this check in dependent 5304 // contexts because (1) the parameter depth will be off when 5305 // matching friend templates and (2) we might actually be 5306 // selecting a friend based on a dependent factor. But there 5307 // are situations where these conditions don't apply and we 5308 // can actually do this check immediately. 5309 if (isFriend && 5310 (TemplateParamLists.size() || 5311 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5312 CurContext->isDependentContext())) { 5313 // ignore these 5314 } else { 5315 // The user tried to provide an out-of-line definition for a 5316 // function that is a member of a class or namespace, but there 5317 // was no such member function declared (C++ [class.mfct]p2, 5318 // C++ [namespace.memdef]p2). For example: 5319 // 5320 // class X { 5321 // void f() const; 5322 // }; 5323 // 5324 // void X::f() { } // ill-formed 5325 // 5326 // Complain about this problem, and attempt to suggest close 5327 // matches (e.g., those that differ only in cv-qualifiers and 5328 // whether the parameter types are references). 5329 5330 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5331 NewFD, 5332 ExtraArgs)) { 5333 AddToScope = ExtraArgs.AddToScope; 5334 return Result; 5335 } 5336 } 5337 5338 // Unqualified local friend declarations are required to resolve 5339 // to something. 5340 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5341 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5342 NewFD, 5343 ExtraArgs)) { 5344 AddToScope = ExtraArgs.AddToScope; 5345 return Result; 5346 } 5347 } 5348 5349 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5350 !isFriend && !isFunctionTemplateSpecialization && 5351 !isExplicitSpecialization) { 5352 // An out-of-line member function declaration must also be a 5353 // definition (C++ [dcl.meaning]p1). 5354 // Note that this is not the case for explicit specializations of 5355 // function templates or member functions of class templates, per 5356 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5357 // extension for compatibility with old SWIG code which likes to 5358 // generate them. 5359 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5360 << D.getCXXScopeSpec().getRange(); 5361 } 5362 } 5363 5364 5365 // Handle attributes. We need to have merged decls when handling attributes 5366 // (for example to check for conflicts, etc). 5367 // FIXME: This needs to happen before we merge declarations. Then, 5368 // let attribute merging cope with attribute conflicts. 5369 ProcessDeclAttributes(S, NewFD, D, 5370 /*NonInheritable=*/false, /*Inheritable=*/true); 5371 5372 // attributes declared post-definition are currently ignored 5373 // FIXME: This should happen during attribute merging 5374 if (D.isRedeclaration() && Previous.isSingleResult()) { 5375 const FunctionDecl *Def; 5376 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5377 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5378 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5379 Diag(Def->getLocation(), diag::note_previous_definition); 5380 } 5381 } 5382 5383 AddKnownFunctionAttributes(NewFD); 5384 5385 if (NewFD->hasAttr<OverloadableAttr>() && 5386 !NewFD->getType()->getAs<FunctionProtoType>()) { 5387 Diag(NewFD->getLocation(), 5388 diag::err_attribute_overloadable_no_prototype) 5389 << NewFD; 5390 5391 // Turn this into a variadic function with no parameters. 5392 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5393 FunctionProtoType::ExtProtoInfo EPI; 5394 EPI.Variadic = true; 5395 EPI.ExtInfo = FT->getExtInfo(); 5396 5397 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5398 NewFD->setType(R); 5399 } 5400 5401 // If there's a #pragma GCC visibility in scope, and this isn't a class 5402 // member, set the visibility of this function. 5403 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5404 AddPushedVisibilityAttribute(NewFD); 5405 5406 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5407 // marking the function. 5408 AddCFAuditedAttribute(NewFD); 5409 5410 // If this is a locally-scoped extern C function, update the 5411 // map of such names. 5412 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5413 && !NewFD->isInvalidDecl()) 5414 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5415 5416 // Set this FunctionDecl's range up to the right paren. 5417 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5418 5419 if (getLangOptions().CPlusPlus) { 5420 if (FunctionTemplate) { 5421 if (NewFD->isInvalidDecl()) 5422 FunctionTemplate->setInvalidDecl(); 5423 return FunctionTemplate; 5424 } 5425 } 5426 5427 MarkUnusedFileScopedDecl(NewFD); 5428 5429 if (getLangOptions().CUDA) 5430 if (IdentifierInfo *II = NewFD->getIdentifier()) 5431 if (!NewFD->isInvalidDecl() && 5432 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5433 if (II->isStr("cudaConfigureCall")) { 5434 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5435 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5436 5437 Context.setcudaConfigureCallDecl(NewFD); 5438 } 5439 } 5440 5441 // Here we have an function template explicit specialization at class scope. 5442 // The actually specialization will be postponed to template instatiation 5443 // time via the ClassScopeFunctionSpecializationDecl node. 5444 if (isDependentClassScopeExplicitSpecialization) { 5445 ClassScopeFunctionSpecializationDecl *NewSpec = 5446 ClassScopeFunctionSpecializationDecl::Create( 5447 Context, CurContext, SourceLocation(), 5448 cast<CXXMethodDecl>(NewFD)); 5449 CurContext->addDecl(NewSpec); 5450 AddToScope = false; 5451 } 5452 5453 return NewFD; 5454} 5455 5456/// \brief Perform semantic checking of a new function declaration. 5457/// 5458/// Performs semantic analysis of the new function declaration 5459/// NewFD. This routine performs all semantic checking that does not 5460/// require the actual declarator involved in the declaration, and is 5461/// used both for the declaration of functions as they are parsed 5462/// (called via ActOnDeclarator) and for the declaration of functions 5463/// that have been instantiated via C++ template instantiation (called 5464/// via InstantiateDecl). 5465/// 5466/// \param IsExplicitSpecialiation whether this new function declaration is 5467/// an explicit specialization of the previous declaration. 5468/// 5469/// This sets NewFD->isInvalidDecl() to true if there was an error. 5470/// 5471/// Returns true if the function declaration is a redeclaration. 5472bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5473 LookupResult &Previous, 5474 bool IsExplicitSpecialization) { 5475 assert(!NewFD->getResultType()->isVariablyModifiedType() 5476 && "Variably modified return types are not handled here"); 5477 5478 // Check for a previous declaration of this name. 5479 if (Previous.empty() && NewFD->isExternC()) { 5480 // Since we did not find anything by this name and we're declaring 5481 // an extern "C" function, look for a non-visible extern "C" 5482 // declaration with the same name. 5483 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5484 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5485 if (Pos != LocallyScopedExternalDecls.end()) 5486 Previous.addDecl(Pos->second); 5487 } 5488 5489 bool Redeclaration = false; 5490 5491 // Merge or overload the declaration with an existing declaration of 5492 // the same name, if appropriate. 5493 if (!Previous.empty()) { 5494 // Determine whether NewFD is an overload of PrevDecl or 5495 // a declaration that requires merging. If it's an overload, 5496 // there's no more work to do here; we'll just add the new 5497 // function to the scope. 5498 5499 NamedDecl *OldDecl = 0; 5500 if (!AllowOverloadingOfFunction(Previous, Context)) { 5501 Redeclaration = true; 5502 OldDecl = Previous.getFoundDecl(); 5503 } else { 5504 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5505 /*NewIsUsingDecl*/ false)) { 5506 case Ovl_Match: 5507 Redeclaration = true; 5508 break; 5509 5510 case Ovl_NonFunction: 5511 Redeclaration = true; 5512 break; 5513 5514 case Ovl_Overload: 5515 Redeclaration = false; 5516 break; 5517 } 5518 5519 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5520 // If a function name is overloadable in C, then every function 5521 // with that name must be marked "overloadable". 5522 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5523 << Redeclaration << NewFD; 5524 NamedDecl *OverloadedDecl = 0; 5525 if (Redeclaration) 5526 OverloadedDecl = OldDecl; 5527 else if (!Previous.empty()) 5528 OverloadedDecl = Previous.getRepresentativeDecl(); 5529 if (OverloadedDecl) 5530 Diag(OverloadedDecl->getLocation(), 5531 diag::note_attribute_overloadable_prev_overload); 5532 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5533 Context)); 5534 } 5535 } 5536 5537 if (Redeclaration) { 5538 // NewFD and OldDecl represent declarations that need to be 5539 // merged. 5540 if (MergeFunctionDecl(NewFD, OldDecl)) { 5541 NewFD->setInvalidDecl(); 5542 return Redeclaration; 5543 } 5544 5545 Previous.clear(); 5546 Previous.addDecl(OldDecl); 5547 5548 if (FunctionTemplateDecl *OldTemplateDecl 5549 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5550 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5551 FunctionTemplateDecl *NewTemplateDecl 5552 = NewFD->getDescribedFunctionTemplate(); 5553 assert(NewTemplateDecl && "Template/non-template mismatch"); 5554 if (CXXMethodDecl *Method 5555 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5556 Method->setAccess(OldTemplateDecl->getAccess()); 5557 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5558 } 5559 5560 // If this is an explicit specialization of a member that is a function 5561 // template, mark it as a member specialization. 5562 if (IsExplicitSpecialization && 5563 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5564 NewTemplateDecl->setMemberSpecialization(); 5565 assert(OldTemplateDecl->isMemberSpecialization()); 5566 } 5567 5568 if (OldTemplateDecl->isModulePrivate()) 5569 NewTemplateDecl->setModulePrivate(); 5570 5571 } else { 5572 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5573 NewFD->setAccess(OldDecl->getAccess()); 5574 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5575 } 5576 } 5577 } 5578 5579 // Semantic checking for this function declaration (in isolation). 5580 if (getLangOptions().CPlusPlus) { 5581 // C++-specific checks. 5582 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5583 CheckConstructor(Constructor); 5584 } else if (CXXDestructorDecl *Destructor = 5585 dyn_cast<CXXDestructorDecl>(NewFD)) { 5586 CXXRecordDecl *Record = Destructor->getParent(); 5587 QualType ClassType = Context.getTypeDeclType(Record); 5588 5589 // FIXME: Shouldn't we be able to perform this check even when the class 5590 // type is dependent? Both gcc and edg can handle that. 5591 if (!ClassType->isDependentType()) { 5592 DeclarationName Name 5593 = Context.DeclarationNames.getCXXDestructorName( 5594 Context.getCanonicalType(ClassType)); 5595 if (NewFD->getDeclName() != Name) { 5596 Diag(NewFD->getLocation(), diag::err_destructor_name); 5597 NewFD->setInvalidDecl(); 5598 return Redeclaration; 5599 } 5600 } 5601 } else if (CXXConversionDecl *Conversion 5602 = dyn_cast<CXXConversionDecl>(NewFD)) { 5603 ActOnConversionDeclarator(Conversion); 5604 } 5605 5606 // Find any virtual functions that this function overrides. 5607 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5608 if (!Method->isFunctionTemplateSpecialization() && 5609 !Method->getDescribedFunctionTemplate()) { 5610 if (AddOverriddenMethods(Method->getParent(), Method)) { 5611 // If the function was marked as "static", we have a problem. 5612 if (NewFD->getStorageClass() == SC_Static) { 5613 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5614 << NewFD->getDeclName(); 5615 for (CXXMethodDecl::method_iterator 5616 Overridden = Method->begin_overridden_methods(), 5617 OverriddenEnd = Method->end_overridden_methods(); 5618 Overridden != OverriddenEnd; 5619 ++Overridden) { 5620 Diag((*Overridden)->getLocation(), 5621 diag::note_overridden_virtual_function); 5622 } 5623 } 5624 } 5625 } 5626 } 5627 5628 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5629 if (NewFD->isOverloadedOperator() && 5630 CheckOverloadedOperatorDeclaration(NewFD)) { 5631 NewFD->setInvalidDecl(); 5632 return Redeclaration; 5633 } 5634 5635 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5636 if (NewFD->getLiteralIdentifier() && 5637 CheckLiteralOperatorDeclaration(NewFD)) { 5638 NewFD->setInvalidDecl(); 5639 return Redeclaration; 5640 } 5641 5642 // In C++, check default arguments now that we have merged decls. Unless 5643 // the lexical context is the class, because in this case this is done 5644 // during delayed parsing anyway. 5645 if (!CurContext->isRecord()) 5646 CheckCXXDefaultArguments(NewFD); 5647 5648 // If this function declares a builtin function, check the type of this 5649 // declaration against the expected type for the builtin. 5650 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5651 ASTContext::GetBuiltinTypeError Error; 5652 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5653 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5654 // The type of this function differs from the type of the builtin, 5655 // so forget about the builtin entirely. 5656 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5657 } 5658 } 5659 } 5660 return Redeclaration; 5661} 5662 5663void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5664 // C++ [basic.start.main]p3: A program that declares main to be inline 5665 // or static is ill-formed. 5666 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5667 // shall not appear in a declaration of main. 5668 // static main is not an error under C99, but we should warn about it. 5669 if (FD->getStorageClass() == SC_Static) 5670 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5671 ? diag::err_static_main : diag::warn_static_main) 5672 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5673 if (FD->isInlineSpecified()) 5674 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5675 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5676 5677 QualType T = FD->getType(); 5678 assert(T->isFunctionType() && "function decl is not of function type"); 5679 const FunctionType* FT = T->getAs<FunctionType>(); 5680 5681 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5682 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5683 FD->setInvalidDecl(true); 5684 } 5685 5686 // Treat protoless main() as nullary. 5687 if (isa<FunctionNoProtoType>(FT)) return; 5688 5689 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5690 unsigned nparams = FTP->getNumArgs(); 5691 assert(FD->getNumParams() == nparams); 5692 5693 bool HasExtraParameters = (nparams > 3); 5694 5695 // Darwin passes an undocumented fourth argument of type char**. If 5696 // other platforms start sprouting these, the logic below will start 5697 // getting shifty. 5698 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5699 HasExtraParameters = false; 5700 5701 if (HasExtraParameters) { 5702 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5703 FD->setInvalidDecl(true); 5704 nparams = 3; 5705 } 5706 5707 // FIXME: a lot of the following diagnostics would be improved 5708 // if we had some location information about types. 5709 5710 QualType CharPP = 5711 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5712 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5713 5714 for (unsigned i = 0; i < nparams; ++i) { 5715 QualType AT = FTP->getArgType(i); 5716 5717 bool mismatch = true; 5718 5719 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5720 mismatch = false; 5721 else if (Expected[i] == CharPP) { 5722 // As an extension, the following forms are okay: 5723 // char const ** 5724 // char const * const * 5725 // char * const * 5726 5727 QualifierCollector qs; 5728 const PointerType* PT; 5729 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5730 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5731 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5732 qs.removeConst(); 5733 mismatch = !qs.empty(); 5734 } 5735 } 5736 5737 if (mismatch) { 5738 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5739 // TODO: suggest replacing given type with expected type 5740 FD->setInvalidDecl(true); 5741 } 5742 } 5743 5744 if (nparams == 1 && !FD->isInvalidDecl()) { 5745 Diag(FD->getLocation(), diag::warn_main_one_arg); 5746 } 5747 5748 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5749 Diag(FD->getLocation(), diag::err_main_template_decl); 5750 FD->setInvalidDecl(); 5751 } 5752} 5753 5754bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5755 // FIXME: Need strict checking. In C89, we need to check for 5756 // any assignment, increment, decrement, function-calls, or 5757 // commas outside of a sizeof. In C99, it's the same list, 5758 // except that the aforementioned are allowed in unevaluated 5759 // expressions. Everything else falls under the 5760 // "may accept other forms of constant expressions" exception. 5761 // (We never end up here for C++, so the constant expression 5762 // rules there don't matter.) 5763 if (Init->isConstantInitializer(Context, false)) 5764 return false; 5765 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5766 << Init->getSourceRange(); 5767 return true; 5768} 5769 5770namespace { 5771 // Visits an initialization expression to see if OrigDecl is evaluated in 5772 // its own initialization and throws a warning if it does. 5773 class SelfReferenceChecker 5774 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5775 Sema &S; 5776 Decl *OrigDecl; 5777 bool isRecordType; 5778 bool isPODType; 5779 5780 public: 5781 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5782 5783 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5784 S(S), OrigDecl(OrigDecl) { 5785 isPODType = false; 5786 isRecordType = false; 5787 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5788 isPODType = VD->getType().isPODType(S.Context); 5789 isRecordType = VD->getType()->isRecordType(); 5790 } 5791 } 5792 5793 void VisitExpr(Expr *E) { 5794 if (isa<ObjCMessageExpr>(*E)) return; 5795 if (isRecordType) { 5796 Expr *expr = E; 5797 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5798 ValueDecl *VD = ME->getMemberDecl(); 5799 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5800 expr = ME->getBase(); 5801 } 5802 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5803 HandleDeclRefExpr(DRE); 5804 return; 5805 } 5806 } 5807 Inherited::VisitExpr(E); 5808 } 5809 5810 void VisitMemberExpr(MemberExpr *E) { 5811 if (E->getType()->canDecayToPointerType()) return; 5812 if (isa<FieldDecl>(E->getMemberDecl())) 5813 if (DeclRefExpr *DRE 5814 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5815 HandleDeclRefExpr(DRE); 5816 return; 5817 } 5818 Inherited::VisitMemberExpr(E); 5819 } 5820 5821 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5822 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5823 (isRecordType && E->getCastKind() == CK_NoOp)) { 5824 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5825 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5826 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5827 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5828 HandleDeclRefExpr(DRE); 5829 return; 5830 } 5831 } 5832 Inherited::VisitImplicitCastExpr(E); 5833 } 5834 5835 void VisitUnaryOperator(UnaryOperator *E) { 5836 // For POD record types, addresses of its own members are well-defined. 5837 if (isRecordType && isPODType) return; 5838 Inherited::VisitUnaryOperator(E); 5839 } 5840 5841 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5842 Decl* ReferenceDecl = DRE->getDecl(); 5843 if (OrigDecl != ReferenceDecl) return; 5844 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5845 Sema::NotForRedeclaration); 5846 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5847 S.PDiag(diag::warn_uninit_self_reference_in_init) 5848 << Result.getLookupName() 5849 << OrigDecl->getLocation() 5850 << DRE->getSourceRange()); 5851 } 5852 }; 5853} 5854 5855/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5856void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5857 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5858} 5859 5860/// AddInitializerToDecl - Adds the initializer Init to the 5861/// declaration dcl. If DirectInit is true, this is C++ direct 5862/// initialization rather than copy initialization. 5863void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5864 bool DirectInit, bool TypeMayContainAuto) { 5865 // If there is no declaration, there was an error parsing it. Just ignore 5866 // the initializer. 5867 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5868 return; 5869 5870 // Check for self-references within variable initializers. 5871 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5872 // Variables declared within a function/method body are handled 5873 // by a dataflow analysis. 5874 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5875 CheckSelfReference(RealDecl, Init); 5876 } 5877 else { 5878 CheckSelfReference(RealDecl, Init); 5879 } 5880 5881 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5882 // With declarators parsed the way they are, the parser cannot 5883 // distinguish between a normal initializer and a pure-specifier. 5884 // Thus this grotesque test. 5885 IntegerLiteral *IL; 5886 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5887 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5888 CheckPureMethod(Method, Init->getSourceRange()); 5889 else { 5890 Diag(Method->getLocation(), diag::err_member_function_initialization) 5891 << Method->getDeclName() << Init->getSourceRange(); 5892 Method->setInvalidDecl(); 5893 } 5894 return; 5895 } 5896 5897 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5898 if (!VDecl) { 5899 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5900 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5901 RealDecl->setInvalidDecl(); 5902 return; 5903 } 5904 5905 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5906 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5907 TypeSourceInfo *DeducedType = 0; 5908 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5909 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5910 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5911 << Init->getSourceRange(); 5912 if (!DeducedType) { 5913 RealDecl->setInvalidDecl(); 5914 return; 5915 } 5916 VDecl->setTypeSourceInfo(DeducedType); 5917 VDecl->setType(DeducedType->getType()); 5918 5919 // In ARC, infer lifetime. 5920 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5921 VDecl->setInvalidDecl(); 5922 5923 // If this is a redeclaration, check that the type we just deduced matches 5924 // the previously declared type. 5925 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5926 MergeVarDeclTypes(VDecl, Old); 5927 } 5928 5929 5930 // A definition must end up with a complete type, which means it must be 5931 // complete with the restriction that an array type might be completed by the 5932 // initializer; note that later code assumes this restriction. 5933 QualType BaseDeclType = VDecl->getType(); 5934 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5935 BaseDeclType = Array->getElementType(); 5936 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5937 diag::err_typecheck_decl_incomplete_type)) { 5938 RealDecl->setInvalidDecl(); 5939 return; 5940 } 5941 5942 // The variable can not have an abstract class type. 5943 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5944 diag::err_abstract_type_in_decl, 5945 AbstractVariableType)) 5946 VDecl->setInvalidDecl(); 5947 5948 const VarDecl *Def; 5949 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5950 Diag(VDecl->getLocation(), diag::err_redefinition) 5951 << VDecl->getDeclName(); 5952 Diag(Def->getLocation(), diag::note_previous_definition); 5953 VDecl->setInvalidDecl(); 5954 return; 5955 } 5956 5957 const VarDecl* PrevInit = 0; 5958 if (getLangOptions().CPlusPlus) { 5959 // C++ [class.static.data]p4 5960 // If a static data member is of const integral or const 5961 // enumeration type, its declaration in the class definition can 5962 // specify a constant-initializer which shall be an integral 5963 // constant expression (5.19). In that case, the member can appear 5964 // in integral constant expressions. The member shall still be 5965 // defined in a namespace scope if it is used in the program and the 5966 // namespace scope definition shall not contain an initializer. 5967 // 5968 // We already performed a redefinition check above, but for static 5969 // data members we also need to check whether there was an in-class 5970 // declaration with an initializer. 5971 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5972 Diag(VDecl->getLocation(), diag::err_redefinition) 5973 << VDecl->getDeclName(); 5974 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5975 return; 5976 } 5977 5978 if (VDecl->hasLocalStorage()) 5979 getCurFunction()->setHasBranchProtectedScope(); 5980 5981 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5982 VDecl->setInvalidDecl(); 5983 return; 5984 } 5985 } 5986 5987 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5988 // a kernel function cannot be initialized." 5989 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5990 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5991 VDecl->setInvalidDecl(); 5992 return; 5993 } 5994 5995 // Capture the variable that is being initialized and the style of 5996 // initialization. 5997 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5998 5999 // FIXME: Poor source location information. 6000 InitializationKind Kind 6001 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 6002 Init->getLocStart(), 6003 Init->getLocEnd()) 6004 : InitializationKind::CreateCopy(VDecl->getLocation(), 6005 Init->getLocStart()); 6006 6007 // Get the decls type and save a reference for later, since 6008 // CheckInitializerTypes may change it. 6009 QualType DclT = VDecl->getType(), SavT = DclT; 6010 if (VDecl->isLocalVarDecl()) { 6011 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 6012 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6013 VDecl->setInvalidDecl(); 6014 } else if (!VDecl->isInvalidDecl()) { 6015 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6016 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6017 MultiExprArg(*this, &Init, 1), 6018 &DclT); 6019 if (Result.isInvalid()) { 6020 VDecl->setInvalidDecl(); 6021 return; 6022 } 6023 6024 Init = Result.takeAs<Expr>(); 6025 6026 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6027 // Don't check invalid declarations to avoid emitting useless diagnostics. 6028 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6029 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6030 CheckForConstantInitializer(Init, DclT); 6031 } 6032 } 6033 } else if (VDecl->isStaticDataMember() && 6034 VDecl->getLexicalDeclContext()->isRecord()) { 6035 // This is an in-class initialization for a static data member, e.g., 6036 // 6037 // struct S { 6038 // static const int value = 17; 6039 // }; 6040 6041 // Try to perform the initialization regardless. 6042 if (!VDecl->isInvalidDecl()) { 6043 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6044 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6045 MultiExprArg(*this, &Init, 1), 6046 &DclT); 6047 if (Result.isInvalid()) { 6048 VDecl->setInvalidDecl(); 6049 return; 6050 } 6051 6052 Init = Result.takeAs<Expr>(); 6053 } 6054 6055 // C++ [class.mem]p4: 6056 // A member-declarator can contain a constant-initializer only 6057 // if it declares a static member (9.4) of const integral or 6058 // const enumeration type, see 9.4.2. 6059 // 6060 // C++0x [class.static.data]p3: 6061 // If a non-volatile const static data member is of integral or 6062 // enumeration type, its declaration in the class definition can 6063 // specify a brace-or-equal-initializer in which every initalizer-clause 6064 // that is an assignment-expression is a constant expression. A static 6065 // data member of literal type can be declared in the class definition 6066 // with the constexpr specifier; if so, its declaration shall specify a 6067 // brace-or-equal-initializer in which every initializer-clause that is 6068 // an assignment-expression is a constant expression. 6069 QualType T = VDecl->getType(); 6070 6071 // Do nothing on dependent types. 6072 if (T->isDependentType()) { 6073 6074 // Allow any 'static constexpr' members, whether or not they are of literal 6075 // type. We separately check that the initializer is a constant expression, 6076 // which implicitly requires the member to be of literal type. 6077 } else if (VDecl->isConstexpr()) { 6078 6079 // Require constness. 6080 } else if (!T.isConstQualified()) { 6081 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6082 << Init->getSourceRange(); 6083 VDecl->setInvalidDecl(); 6084 6085 // We allow integer constant expressions in all cases. 6086 } else if (T->isIntegralOrEnumerationType()) { 6087 // Check whether the expression is a constant expression. 6088 SourceLocation Loc; 6089 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6090 // In C++0x, a non-constexpr const static data member with an 6091 // in-class initializer cannot be volatile. 6092 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6093 else if (Init->isValueDependent()) 6094 ; // Nothing to check. 6095 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6096 ; // Ok, it's an ICE! 6097 else if (Init->isEvaluatable(Context)) { 6098 // If we can constant fold the initializer through heroics, accept it, 6099 // but report this as a use of an extension for -pedantic. 6100 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6101 << Init->getSourceRange(); 6102 } else { 6103 // Otherwise, this is some crazy unknown case. Report the issue at the 6104 // location provided by the isIntegerConstantExpr failed check. 6105 Diag(Loc, diag::err_in_class_initializer_non_constant) 6106 << Init->getSourceRange(); 6107 VDecl->setInvalidDecl(); 6108 } 6109 6110 // We allow floating-point constants as an extension. 6111 } else if (T->isFloatingType()) { // also permits complex, which is ok 6112 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6113 << T << Init->getSourceRange(); 6114 if (getLangOptions().CPlusPlus0x) 6115 Diag(VDecl->getLocation(), 6116 diag::note_in_class_initializer_float_type_constexpr) 6117 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6118 6119 if (!Init->isValueDependent() && 6120 !Init->isConstantInitializer(Context, false)) { 6121 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6122 << Init->getSourceRange(); 6123 VDecl->setInvalidDecl(); 6124 } 6125 6126 // Suggest adding 'constexpr' in C++0x for literal types. 6127 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6128 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6129 << T << Init->getSourceRange() 6130 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6131 VDecl->setConstexpr(true); 6132 6133 } else { 6134 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6135 << T << Init->getSourceRange(); 6136 VDecl->setInvalidDecl(); 6137 } 6138 } else if (VDecl->isFileVarDecl()) { 6139 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6140 (!getLangOptions().CPlusPlus || 6141 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6142 Diag(VDecl->getLocation(), diag::warn_extern_init); 6143 if (!VDecl->isInvalidDecl()) { 6144 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6145 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6146 MultiExprArg(*this, &Init, 1), 6147 &DclT); 6148 if (Result.isInvalid()) { 6149 VDecl->setInvalidDecl(); 6150 return; 6151 } 6152 6153 Init = Result.takeAs<Expr>(); 6154 } 6155 6156 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6157 // Don't check invalid declarations to avoid emitting useless diagnostics. 6158 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6159 // C99 6.7.8p4. All file scoped initializers need to be constant. 6160 CheckForConstantInitializer(Init, DclT); 6161 } 6162 } 6163 // If the type changed, it means we had an incomplete type that was 6164 // completed by the initializer. For example: 6165 // int ary[] = { 1, 3, 5 }; 6166 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6167 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6168 VDecl->setType(DclT); 6169 Init->setType(DclT); 6170 } 6171 6172 // Check any implicit conversions within the expression. 6173 CheckImplicitConversions(Init, VDecl->getLocation()); 6174 6175 if (!VDecl->isInvalidDecl()) 6176 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6177 6178 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6179 !VDecl->getType()->isDependentType() && 6180 !Init->isTypeDependent() && !Init->isValueDependent() && 6181 !Init->isConstantInitializer(Context, 6182 VDecl->getType()->isReferenceType())) { 6183 // FIXME: Improve this diagnostic to explain why the initializer is not 6184 // a constant expression. 6185 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6186 << VDecl << Init->getSourceRange(); 6187 } 6188 6189 Init = MaybeCreateExprWithCleanups(Init); 6190 // Attach the initializer to the decl. 6191 VDecl->setInit(Init); 6192 6193 CheckCompleteVariableDeclaration(VDecl); 6194} 6195 6196/// ActOnInitializerError - Given that there was an error parsing an 6197/// initializer for the given declaration, try to return to some form 6198/// of sanity. 6199void Sema::ActOnInitializerError(Decl *D) { 6200 // Our main concern here is re-establishing invariants like "a 6201 // variable's type is either dependent or complete". 6202 if (!D || D->isInvalidDecl()) return; 6203 6204 VarDecl *VD = dyn_cast<VarDecl>(D); 6205 if (!VD) return; 6206 6207 // Auto types are meaningless if we can't make sense of the initializer. 6208 if (ParsingInitForAutoVars.count(D)) { 6209 D->setInvalidDecl(); 6210 return; 6211 } 6212 6213 QualType Ty = VD->getType(); 6214 if (Ty->isDependentType()) return; 6215 6216 // Require a complete type. 6217 if (RequireCompleteType(VD->getLocation(), 6218 Context.getBaseElementType(Ty), 6219 diag::err_typecheck_decl_incomplete_type)) { 6220 VD->setInvalidDecl(); 6221 return; 6222 } 6223 6224 // Require an abstract type. 6225 if (RequireNonAbstractType(VD->getLocation(), Ty, 6226 diag::err_abstract_type_in_decl, 6227 AbstractVariableType)) { 6228 VD->setInvalidDecl(); 6229 return; 6230 } 6231 6232 // Don't bother complaining about constructors or destructors, 6233 // though. 6234} 6235 6236void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6237 bool TypeMayContainAuto) { 6238 // If there is no declaration, there was an error parsing it. Just ignore it. 6239 if (RealDecl == 0) 6240 return; 6241 6242 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6243 QualType Type = Var->getType(); 6244 6245 // C++0x [dcl.spec.auto]p3 6246 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6247 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6248 << Var->getDeclName() << Type; 6249 Var->setInvalidDecl(); 6250 return; 6251 } 6252 6253 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6254 // have an initializer. 6255 // C++0x [class.static.data]p3: A static data member can be declared with 6256 // the constexpr specifier; if so, its declaration shall specify 6257 // a brace-or-equal-initializer. 6258 // 6259 // A static data member's definition may inherit an initializer from an 6260 // in-class declaration. 6261 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6262 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6263 << Var->getDeclName(); 6264 Var->setInvalidDecl(); 6265 return; 6266 } 6267 6268 switch (Var->isThisDeclarationADefinition()) { 6269 case VarDecl::Definition: 6270 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6271 break; 6272 6273 // We have an out-of-line definition of a static data member 6274 // that has an in-class initializer, so we type-check this like 6275 // a declaration. 6276 // 6277 // Fall through 6278 6279 case VarDecl::DeclarationOnly: 6280 // It's only a declaration. 6281 6282 // Block scope. C99 6.7p7: If an identifier for an object is 6283 // declared with no linkage (C99 6.2.2p6), the type for the 6284 // object shall be complete. 6285 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6286 !Var->getLinkage() && !Var->isInvalidDecl() && 6287 RequireCompleteType(Var->getLocation(), Type, 6288 diag::err_typecheck_decl_incomplete_type)) 6289 Var->setInvalidDecl(); 6290 6291 // Make sure that the type is not abstract. 6292 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6293 RequireNonAbstractType(Var->getLocation(), Type, 6294 diag::err_abstract_type_in_decl, 6295 AbstractVariableType)) 6296 Var->setInvalidDecl(); 6297 return; 6298 6299 case VarDecl::TentativeDefinition: 6300 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6301 // object that has file scope without an initializer, and without a 6302 // storage-class specifier or with the storage-class specifier "static", 6303 // constitutes a tentative definition. Note: A tentative definition with 6304 // external linkage is valid (C99 6.2.2p5). 6305 if (!Var->isInvalidDecl()) { 6306 if (const IncompleteArrayType *ArrayT 6307 = Context.getAsIncompleteArrayType(Type)) { 6308 if (RequireCompleteType(Var->getLocation(), 6309 ArrayT->getElementType(), 6310 diag::err_illegal_decl_array_incomplete_type)) 6311 Var->setInvalidDecl(); 6312 } else if (Var->getStorageClass() == SC_Static) { 6313 // C99 6.9.2p3: If the declaration of an identifier for an object is 6314 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6315 // declared type shall not be an incomplete type. 6316 // NOTE: code such as the following 6317 // static struct s; 6318 // struct s { int a; }; 6319 // is accepted by gcc. Hence here we issue a warning instead of 6320 // an error and we do not invalidate the static declaration. 6321 // NOTE: to avoid multiple warnings, only check the first declaration. 6322 if (Var->getPreviousDeclaration() == 0) 6323 RequireCompleteType(Var->getLocation(), Type, 6324 diag::ext_typecheck_decl_incomplete_type); 6325 } 6326 } 6327 6328 // Record the tentative definition; we're done. 6329 if (!Var->isInvalidDecl()) 6330 TentativeDefinitions.push_back(Var); 6331 return; 6332 } 6333 6334 // Provide a specific diagnostic for uninitialized variable 6335 // definitions with incomplete array type. 6336 if (Type->isIncompleteArrayType()) { 6337 Diag(Var->getLocation(), 6338 diag::err_typecheck_incomplete_array_needs_initializer); 6339 Var->setInvalidDecl(); 6340 return; 6341 } 6342 6343 // Provide a specific diagnostic for uninitialized variable 6344 // definitions with reference type. 6345 if (Type->isReferenceType()) { 6346 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6347 << Var->getDeclName() 6348 << SourceRange(Var->getLocation(), Var->getLocation()); 6349 Var->setInvalidDecl(); 6350 return; 6351 } 6352 6353 // Do not attempt to type-check the default initializer for a 6354 // variable with dependent type. 6355 if (Type->isDependentType()) 6356 return; 6357 6358 if (Var->isInvalidDecl()) 6359 return; 6360 6361 if (RequireCompleteType(Var->getLocation(), 6362 Context.getBaseElementType(Type), 6363 diag::err_typecheck_decl_incomplete_type)) { 6364 Var->setInvalidDecl(); 6365 return; 6366 } 6367 6368 // The variable can not have an abstract class type. 6369 if (RequireNonAbstractType(Var->getLocation(), Type, 6370 diag::err_abstract_type_in_decl, 6371 AbstractVariableType)) { 6372 Var->setInvalidDecl(); 6373 return; 6374 } 6375 6376 // Check for jumps past the implicit initializer. C++0x 6377 // clarifies that this applies to a "variable with automatic 6378 // storage duration", not a "local variable". 6379 // C++11 [stmt.dcl]p3 6380 // A program that jumps from a point where a variable with automatic 6381 // storage duration is not in scope to a point where it is in scope is 6382 // ill-formed unless the variable has scalar type, class type with a 6383 // trivial default constructor and a trivial destructor, a cv-qualified 6384 // version of one of these types, or an array of one of the preceding 6385 // types and is declared without an initializer. 6386 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6387 if (const RecordType *Record 6388 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6389 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6390 // Mark the function for further checking even if the looser rules of 6391 // C++11 do not require such checks, so that we can diagnose 6392 // incompatibilities with C++98. 6393 if (!CXXRecord->isPOD()) 6394 getCurFunction()->setHasBranchProtectedScope(); 6395 } 6396 } 6397 6398 // C++03 [dcl.init]p9: 6399 // If no initializer is specified for an object, and the 6400 // object is of (possibly cv-qualified) non-POD class type (or 6401 // array thereof), the object shall be default-initialized; if 6402 // the object is of const-qualified type, the underlying class 6403 // type shall have a user-declared default 6404 // constructor. Otherwise, if no initializer is specified for 6405 // a non- static object, the object and its subobjects, if 6406 // any, have an indeterminate initial value); if the object 6407 // or any of its subobjects are of const-qualified type, the 6408 // program is ill-formed. 6409 // C++0x [dcl.init]p11: 6410 // If no initializer is specified for an object, the object is 6411 // default-initialized; [...]. 6412 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6413 InitializationKind Kind 6414 = InitializationKind::CreateDefault(Var->getLocation()); 6415 6416 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6417 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6418 MultiExprArg(*this, 0, 0)); 6419 if (Init.isInvalid()) 6420 Var->setInvalidDecl(); 6421 else if (Init.get()) 6422 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6423 6424 CheckCompleteVariableDeclaration(Var); 6425 } 6426} 6427 6428void Sema::ActOnCXXForRangeDecl(Decl *D) { 6429 VarDecl *VD = dyn_cast<VarDecl>(D); 6430 if (!VD) { 6431 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6432 D->setInvalidDecl(); 6433 return; 6434 } 6435 6436 VD->setCXXForRangeDecl(true); 6437 6438 // for-range-declaration cannot be given a storage class specifier. 6439 int Error = -1; 6440 switch (VD->getStorageClassAsWritten()) { 6441 case SC_None: 6442 break; 6443 case SC_Extern: 6444 Error = 0; 6445 break; 6446 case SC_Static: 6447 Error = 1; 6448 break; 6449 case SC_PrivateExtern: 6450 Error = 2; 6451 break; 6452 case SC_Auto: 6453 Error = 3; 6454 break; 6455 case SC_Register: 6456 Error = 4; 6457 break; 6458 case SC_OpenCLWorkGroupLocal: 6459 llvm_unreachable("Unexpected storage class"); 6460 } 6461 if (VD->isConstexpr()) 6462 Error = 5; 6463 if (Error != -1) { 6464 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6465 << VD->getDeclName() << Error; 6466 D->setInvalidDecl(); 6467 } 6468} 6469 6470void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6471 if (var->isInvalidDecl()) return; 6472 6473 // In ARC, don't allow jumps past the implicit initialization of a 6474 // local retaining variable. 6475 if (getLangOptions().ObjCAutoRefCount && 6476 var->hasLocalStorage()) { 6477 switch (var->getType().getObjCLifetime()) { 6478 case Qualifiers::OCL_None: 6479 case Qualifiers::OCL_ExplicitNone: 6480 case Qualifiers::OCL_Autoreleasing: 6481 break; 6482 6483 case Qualifiers::OCL_Weak: 6484 case Qualifiers::OCL_Strong: 6485 getCurFunction()->setHasBranchProtectedScope(); 6486 break; 6487 } 6488 } 6489 6490 // All the following checks are C++ only. 6491 if (!getLangOptions().CPlusPlus) return; 6492 6493 QualType baseType = Context.getBaseElementType(var->getType()); 6494 if (baseType->isDependentType()) return; 6495 6496 // __block variables might require us to capture a copy-initializer. 6497 if (var->hasAttr<BlocksAttr>()) { 6498 // It's currently invalid to ever have a __block variable with an 6499 // array type; should we diagnose that here? 6500 6501 // Regardless, we don't want to ignore array nesting when 6502 // constructing this copy. 6503 QualType type = var->getType(); 6504 6505 if (type->isStructureOrClassType()) { 6506 SourceLocation poi = var->getLocation(); 6507 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6508 ExprResult result = 6509 PerformCopyInitialization( 6510 InitializedEntity::InitializeBlock(poi, type, false), 6511 poi, Owned(varRef)); 6512 if (!result.isInvalid()) { 6513 result = MaybeCreateExprWithCleanups(result); 6514 Expr *init = result.takeAs<Expr>(); 6515 Context.setBlockVarCopyInits(var, init); 6516 } 6517 } 6518 } 6519 6520 // Check for global constructors. 6521 if (!var->getDeclContext()->isDependentContext() && 6522 var->hasGlobalStorage() && 6523 !var->isStaticLocal() && 6524 var->getInit() && 6525 !var->getInit()->isConstantInitializer(Context, 6526 baseType->isReferenceType())) 6527 Diag(var->getLocation(), diag::warn_global_constructor) 6528 << var->getInit()->getSourceRange(); 6529 6530 // Require the destructor. 6531 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6532 FinalizeVarWithDestructor(var, recordType); 6533} 6534 6535/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6536/// any semantic actions necessary after any initializer has been attached. 6537void 6538Sema::FinalizeDeclaration(Decl *ThisDecl) { 6539 // Note that we are no longer parsing the initializer for this declaration. 6540 ParsingInitForAutoVars.erase(ThisDecl); 6541} 6542 6543Sema::DeclGroupPtrTy 6544Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6545 Decl **Group, unsigned NumDecls) { 6546 SmallVector<Decl*, 8> Decls; 6547 6548 if (DS.isTypeSpecOwned()) 6549 Decls.push_back(DS.getRepAsDecl()); 6550 6551 for (unsigned i = 0; i != NumDecls; ++i) 6552 if (Decl *D = Group[i]) 6553 Decls.push_back(D); 6554 6555 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6556 DS.getTypeSpecType() == DeclSpec::TST_auto); 6557} 6558 6559/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6560/// group, performing any necessary semantic checking. 6561Sema::DeclGroupPtrTy 6562Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6563 bool TypeMayContainAuto) { 6564 // C++0x [dcl.spec.auto]p7: 6565 // If the type deduced for the template parameter U is not the same in each 6566 // deduction, the program is ill-formed. 6567 // FIXME: When initializer-list support is added, a distinction is needed 6568 // between the deduced type U and the deduced type which 'auto' stands for. 6569 // auto a = 0, b = { 1, 2, 3 }; 6570 // is legal because the deduced type U is 'int' in both cases. 6571 if (TypeMayContainAuto && NumDecls > 1) { 6572 QualType Deduced; 6573 CanQualType DeducedCanon; 6574 VarDecl *DeducedDecl = 0; 6575 for (unsigned i = 0; i != NumDecls; ++i) { 6576 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6577 AutoType *AT = D->getType()->getContainedAutoType(); 6578 // Don't reissue diagnostics when instantiating a template. 6579 if (AT && D->isInvalidDecl()) 6580 break; 6581 if (AT && AT->isDeduced()) { 6582 QualType U = AT->getDeducedType(); 6583 CanQualType UCanon = Context.getCanonicalType(U); 6584 if (Deduced.isNull()) { 6585 Deduced = U; 6586 DeducedCanon = UCanon; 6587 DeducedDecl = D; 6588 } else if (DeducedCanon != UCanon) { 6589 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6590 diag::err_auto_different_deductions) 6591 << Deduced << DeducedDecl->getDeclName() 6592 << U << D->getDeclName() 6593 << DeducedDecl->getInit()->getSourceRange() 6594 << D->getInit()->getSourceRange(); 6595 D->setInvalidDecl(); 6596 break; 6597 } 6598 } 6599 } 6600 } 6601 } 6602 6603 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6604} 6605 6606 6607/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6608/// to introduce parameters into function prototype scope. 6609Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6610 const DeclSpec &DS = D.getDeclSpec(); 6611 6612 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6613 // C++03 [dcl.stc]p2 also permits 'auto'. 6614 VarDecl::StorageClass StorageClass = SC_None; 6615 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6616 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6617 StorageClass = SC_Register; 6618 StorageClassAsWritten = SC_Register; 6619 } else if (getLangOptions().CPlusPlus && 6620 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6621 StorageClass = SC_Auto; 6622 StorageClassAsWritten = SC_Auto; 6623 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6624 Diag(DS.getStorageClassSpecLoc(), 6625 diag::err_invalid_storage_class_in_func_decl); 6626 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6627 } 6628 6629 if (D.getDeclSpec().isThreadSpecified()) 6630 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6631 if (D.getDeclSpec().isConstexprSpecified()) 6632 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6633 << 0; 6634 6635 DiagnoseFunctionSpecifiers(D); 6636 6637 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6638 QualType parmDeclType = TInfo->getType(); 6639 6640 if (getLangOptions().CPlusPlus) { 6641 // Check that there are no default arguments inside the type of this 6642 // parameter. 6643 CheckExtraCXXDefaultArguments(D); 6644 6645 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6646 if (D.getCXXScopeSpec().isSet()) { 6647 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6648 << D.getCXXScopeSpec().getRange(); 6649 D.getCXXScopeSpec().clear(); 6650 } 6651 } 6652 6653 // Ensure we have a valid name 6654 IdentifierInfo *II = 0; 6655 if (D.hasName()) { 6656 II = D.getIdentifier(); 6657 if (!II) { 6658 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6659 << GetNameForDeclarator(D).getName().getAsString(); 6660 D.setInvalidType(true); 6661 } 6662 } 6663 6664 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6665 if (II) { 6666 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6667 ForRedeclaration); 6668 LookupName(R, S); 6669 if (R.isSingleResult()) { 6670 NamedDecl *PrevDecl = R.getFoundDecl(); 6671 if (PrevDecl->isTemplateParameter()) { 6672 // Maybe we will complain about the shadowed template parameter. 6673 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6674 // Just pretend that we didn't see the previous declaration. 6675 PrevDecl = 0; 6676 } else if (S->isDeclScope(PrevDecl)) { 6677 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6678 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6679 6680 // Recover by removing the name 6681 II = 0; 6682 D.SetIdentifier(0, D.getIdentifierLoc()); 6683 D.setInvalidType(true); 6684 } 6685 } 6686 } 6687 6688 // Temporarily put parameter variables in the translation unit, not 6689 // the enclosing context. This prevents them from accidentally 6690 // looking like class members in C++. 6691 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6692 D.getSourceRange().getBegin(), 6693 D.getIdentifierLoc(), II, 6694 parmDeclType, TInfo, 6695 StorageClass, StorageClassAsWritten); 6696 6697 if (D.isInvalidType()) 6698 New->setInvalidDecl(); 6699 6700 assert(S->isFunctionPrototypeScope()); 6701 assert(S->getFunctionPrototypeDepth() >= 1); 6702 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6703 S->getNextFunctionPrototypeIndex()); 6704 6705 // Add the parameter declaration into this scope. 6706 S->AddDecl(New); 6707 if (II) 6708 IdResolver.AddDecl(New); 6709 6710 ProcessDeclAttributes(S, New, D); 6711 6712 if (D.getDeclSpec().isModulePrivateSpecified()) 6713 Diag(New->getLocation(), diag::err_module_private_local) 6714 << 1 << New->getDeclName() 6715 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6716 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6717 6718 if (New->hasAttr<BlocksAttr>()) { 6719 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6720 } 6721 return New; 6722} 6723 6724/// \brief Synthesizes a variable for a parameter arising from a 6725/// typedef. 6726ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6727 SourceLocation Loc, 6728 QualType T) { 6729 /* FIXME: setting StartLoc == Loc. 6730 Would it be worth to modify callers so as to provide proper source 6731 location for the unnamed parameters, embedding the parameter's type? */ 6732 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6733 T, Context.getTrivialTypeSourceInfo(T, Loc), 6734 SC_None, SC_None, 0); 6735 Param->setImplicit(); 6736 return Param; 6737} 6738 6739void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6740 ParmVarDecl * const *ParamEnd) { 6741 // Don't diagnose unused-parameter errors in template instantiations; we 6742 // will already have done so in the template itself. 6743 if (!ActiveTemplateInstantiations.empty()) 6744 return; 6745 6746 for (; Param != ParamEnd; ++Param) { 6747 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6748 !(*Param)->hasAttr<UnusedAttr>()) { 6749 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6750 << (*Param)->getDeclName(); 6751 } 6752 } 6753} 6754 6755void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6756 ParmVarDecl * const *ParamEnd, 6757 QualType ReturnTy, 6758 NamedDecl *D) { 6759 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6760 return; 6761 6762 // Warn if the return value is pass-by-value and larger than the specified 6763 // threshold. 6764 if (ReturnTy.isPODType(Context)) { 6765 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6766 if (Size > LangOpts.NumLargeByValueCopy) 6767 Diag(D->getLocation(), diag::warn_return_value_size) 6768 << D->getDeclName() << Size; 6769 } 6770 6771 // Warn if any parameter is pass-by-value and larger than the specified 6772 // threshold. 6773 for (; Param != ParamEnd; ++Param) { 6774 QualType T = (*Param)->getType(); 6775 if (!T.isPODType(Context)) 6776 continue; 6777 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6778 if (Size > LangOpts.NumLargeByValueCopy) 6779 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6780 << (*Param)->getDeclName() << Size; 6781 } 6782} 6783 6784ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6785 SourceLocation NameLoc, IdentifierInfo *Name, 6786 QualType T, TypeSourceInfo *TSInfo, 6787 VarDecl::StorageClass StorageClass, 6788 VarDecl::StorageClass StorageClassAsWritten) { 6789 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6790 if (getLangOptions().ObjCAutoRefCount && 6791 T.getObjCLifetime() == Qualifiers::OCL_None && 6792 T->isObjCLifetimeType()) { 6793 6794 Qualifiers::ObjCLifetime lifetime; 6795 6796 // Special cases for arrays: 6797 // - if it's const, use __unsafe_unretained 6798 // - otherwise, it's an error 6799 if (T->isArrayType()) { 6800 if (!T.isConstQualified()) { 6801 DelayedDiagnostics.add( 6802 sema::DelayedDiagnostic::makeForbiddenType( 6803 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6804 } 6805 lifetime = Qualifiers::OCL_ExplicitNone; 6806 } else { 6807 lifetime = T->getObjCARCImplicitLifetime(); 6808 } 6809 T = Context.getLifetimeQualifiedType(T, lifetime); 6810 } 6811 6812 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6813 Context.getAdjustedParameterType(T), 6814 TSInfo, 6815 StorageClass, StorageClassAsWritten, 6816 0); 6817 6818 // Parameters can not be abstract class types. 6819 // For record types, this is done by the AbstractClassUsageDiagnoser once 6820 // the class has been completely parsed. 6821 if (!CurContext->isRecord() && 6822 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6823 AbstractParamType)) 6824 New->setInvalidDecl(); 6825 6826 // Parameter declarators cannot be interface types. All ObjC objects are 6827 // passed by reference. 6828 if (T->isObjCObjectType()) { 6829 Diag(NameLoc, 6830 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6831 << FixItHint::CreateInsertion(NameLoc, "*"); 6832 T = Context.getObjCObjectPointerType(T); 6833 New->setType(T); 6834 } 6835 6836 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6837 // duration shall not be qualified by an address-space qualifier." 6838 // Since all parameters have automatic store duration, they can not have 6839 // an address space. 6840 if (T.getAddressSpace() != 0) { 6841 Diag(NameLoc, diag::err_arg_with_address_space); 6842 New->setInvalidDecl(); 6843 } 6844 6845 return New; 6846} 6847 6848void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6849 SourceLocation LocAfterDecls) { 6850 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6851 6852 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6853 // for a K&R function. 6854 if (!FTI.hasPrototype) { 6855 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6856 --i; 6857 if (FTI.ArgInfo[i].Param == 0) { 6858 llvm::SmallString<256> Code; 6859 llvm::raw_svector_ostream(Code) << " int " 6860 << FTI.ArgInfo[i].Ident->getName() 6861 << ";\n"; 6862 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6863 << FTI.ArgInfo[i].Ident 6864 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6865 6866 // Implicitly declare the argument as type 'int' for lack of a better 6867 // type. 6868 AttributeFactory attrs; 6869 DeclSpec DS(attrs); 6870 const char* PrevSpec; // unused 6871 unsigned DiagID; // unused 6872 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6873 PrevSpec, DiagID); 6874 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6875 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6876 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6877 } 6878 } 6879 } 6880} 6881 6882Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6883 Declarator &D) { 6884 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6885 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6886 Scope *ParentScope = FnBodyScope->getParent(); 6887 6888 D.setFunctionDefinition(true); 6889 Decl *DP = HandleDeclarator(ParentScope, D, 6890 MultiTemplateParamsArg(*this)); 6891 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6892} 6893 6894static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6895 // Don't warn about invalid declarations. 6896 if (FD->isInvalidDecl()) 6897 return false; 6898 6899 // Or declarations that aren't global. 6900 if (!FD->isGlobal()) 6901 return false; 6902 6903 // Don't warn about C++ member functions. 6904 if (isa<CXXMethodDecl>(FD)) 6905 return false; 6906 6907 // Don't warn about 'main'. 6908 if (FD->isMain()) 6909 return false; 6910 6911 // Don't warn about inline functions. 6912 if (FD->isInlined()) 6913 return false; 6914 6915 // Don't warn about function templates. 6916 if (FD->getDescribedFunctionTemplate()) 6917 return false; 6918 6919 // Don't warn about function template specializations. 6920 if (FD->isFunctionTemplateSpecialization()) 6921 return false; 6922 6923 bool MissingPrototype = true; 6924 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6925 Prev; Prev = Prev->getPreviousDeclaration()) { 6926 // Ignore any declarations that occur in function or method 6927 // scope, because they aren't visible from the header. 6928 if (Prev->getDeclContext()->isFunctionOrMethod()) 6929 continue; 6930 6931 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6932 break; 6933 } 6934 6935 return MissingPrototype; 6936} 6937 6938void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6939 // Don't complain if we're in GNU89 mode and the previous definition 6940 // was an extern inline function. 6941 const FunctionDecl *Definition; 6942 if (FD->isDefined(Definition) && 6943 !canRedefineFunction(Definition, getLangOptions())) { 6944 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6945 Definition->getStorageClass() == SC_Extern) 6946 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6947 << FD->getDeclName() << getLangOptions().CPlusPlus; 6948 else 6949 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6950 Diag(Definition->getLocation(), diag::note_previous_definition); 6951 } 6952} 6953 6954Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6955 // Clear the last template instantiation error context. 6956 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6957 6958 if (!D) 6959 return D; 6960 FunctionDecl *FD = 0; 6961 6962 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6963 FD = FunTmpl->getTemplatedDecl(); 6964 else 6965 FD = cast<FunctionDecl>(D); 6966 6967 // Enter a new function scope 6968 PushFunctionScope(); 6969 6970 // See if this is a redefinition. 6971 if (!FD->isLateTemplateParsed()) 6972 CheckForFunctionRedefinition(FD); 6973 6974 // Builtin functions cannot be defined. 6975 if (unsigned BuiltinID = FD->getBuiltinID()) { 6976 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6977 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6978 FD->setInvalidDecl(); 6979 } 6980 } 6981 6982 // The return type of a function definition must be complete 6983 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6984 QualType ResultType = FD->getResultType(); 6985 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6986 !FD->isInvalidDecl() && 6987 RequireCompleteType(FD->getLocation(), ResultType, 6988 diag::err_func_def_incomplete_result)) 6989 FD->setInvalidDecl(); 6990 6991 // GNU warning -Wmissing-prototypes: 6992 // Warn if a global function is defined without a previous 6993 // prototype declaration. This warning is issued even if the 6994 // definition itself provides a prototype. The aim is to detect 6995 // global functions that fail to be declared in header files. 6996 if (ShouldWarnAboutMissingPrototype(FD)) 6997 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6998 6999 if (FnBodyScope) 7000 PushDeclContext(FnBodyScope, FD); 7001 7002 // Check the validity of our function parameters 7003 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7004 /*CheckParameterNames=*/true); 7005 7006 // Introduce our parameters into the function scope 7007 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7008 ParmVarDecl *Param = FD->getParamDecl(p); 7009 Param->setOwningFunction(FD); 7010 7011 // If this has an identifier, add it to the scope stack. 7012 if (Param->getIdentifier() && FnBodyScope) { 7013 CheckShadow(FnBodyScope, Param); 7014 7015 PushOnScopeChains(Param, FnBodyScope); 7016 } 7017 } 7018 7019 // Checking attributes of current function definition 7020 // dllimport attribute. 7021 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7022 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7023 // dllimport attribute cannot be directly applied to definition. 7024 // Microsoft accepts dllimport for functions defined within class scope. 7025 if (!DA->isInherited() && 7026 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7027 Diag(FD->getLocation(), 7028 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7029 << "dllimport"; 7030 FD->setInvalidDecl(); 7031 return FD; 7032 } 7033 7034 // Visual C++ appears to not think this is an issue, so only issue 7035 // a warning when Microsoft extensions are disabled. 7036 if (!LangOpts.MicrosoftExt) { 7037 // If a symbol previously declared dllimport is later defined, the 7038 // attribute is ignored in subsequent references, and a warning is 7039 // emitted. 7040 Diag(FD->getLocation(), 7041 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7042 << FD->getName() << "dllimport"; 7043 } 7044 } 7045 return FD; 7046} 7047 7048/// \brief Given the set of return statements within a function body, 7049/// compute the variables that are subject to the named return value 7050/// optimization. 7051/// 7052/// Each of the variables that is subject to the named return value 7053/// optimization will be marked as NRVO variables in the AST, and any 7054/// return statement that has a marked NRVO variable as its NRVO candidate can 7055/// use the named return value optimization. 7056/// 7057/// This function applies a very simplistic algorithm for NRVO: if every return 7058/// statement in the function has the same NRVO candidate, that candidate is 7059/// the NRVO variable. 7060/// 7061/// FIXME: Employ a smarter algorithm that accounts for multiple return 7062/// statements and the lifetimes of the NRVO candidates. We should be able to 7063/// find a maximal set of NRVO variables. 7064void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7065 ReturnStmt **Returns = Scope->Returns.data(); 7066 7067 const VarDecl *NRVOCandidate = 0; 7068 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7069 if (!Returns[I]->getNRVOCandidate()) 7070 return; 7071 7072 if (!NRVOCandidate) 7073 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7074 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7075 return; 7076 } 7077 7078 if (NRVOCandidate) 7079 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7080} 7081 7082Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7083 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7084} 7085 7086Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7087 bool IsInstantiation) { 7088 FunctionDecl *FD = 0; 7089 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7090 if (FunTmpl) 7091 FD = FunTmpl->getTemplatedDecl(); 7092 else 7093 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7094 7095 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7096 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7097 7098 if (FD) { 7099 FD->setBody(Body); 7100 if (FD->isMain()) { 7101 // C and C++ allow for main to automagically return 0. 7102 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7103 FD->setHasImplicitReturnZero(true); 7104 WP.disableCheckFallThrough(); 7105 } else if (FD->hasAttr<NakedAttr>()) { 7106 // If the function is marked 'naked', don't complain about missing return 7107 // statements. 7108 WP.disableCheckFallThrough(); 7109 } 7110 7111 // MSVC permits the use of pure specifier (=0) on function definition, 7112 // defined at class scope, warn about this non standard construct. 7113 if (getLangOptions().MicrosoftExt && FD->isPure()) 7114 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7115 7116 if (!FD->isInvalidDecl()) { 7117 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7118 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7119 FD->getResultType(), FD); 7120 7121 // If this is a constructor, we need a vtable. 7122 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7123 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7124 7125 computeNRVO(Body, getCurFunction()); 7126 } 7127 7128 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7129 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7130 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7131 MD->setBody(Body); 7132 if (Body) 7133 MD->setEndLoc(Body->getLocEnd()); 7134 if (!MD->isInvalidDecl()) { 7135 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7136 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7137 MD->getResultType(), MD); 7138 7139 if (Body) 7140 computeNRVO(Body, getCurFunction()); 7141 } 7142 if (ObjCShouldCallSuperDealloc) { 7143 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7144 ObjCShouldCallSuperDealloc = false; 7145 } 7146 if (ObjCShouldCallSuperFinalize) { 7147 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7148 ObjCShouldCallSuperFinalize = false; 7149 } 7150 } else { 7151 return 0; 7152 } 7153 7154 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7155 "ObjC methods, which should have been handled in the block above."); 7156 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7157 "ObjC methods, which should have been handled in the block above."); 7158 7159 // Verify and clean out per-function state. 7160 if (Body) { 7161 // C++ constructors that have function-try-blocks can't have return 7162 // statements in the handlers of that block. (C++ [except.handle]p14) 7163 // Verify this. 7164 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7165 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7166 7167 // Verify that gotos and switch cases don't jump into scopes illegally. 7168 if (getCurFunction()->NeedsScopeChecking() && 7169 !dcl->isInvalidDecl() && 7170 !hasAnyUnrecoverableErrorsInThisFunction()) 7171 DiagnoseInvalidJumps(Body); 7172 7173 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7174 if (!Destructor->getParent()->isDependentType()) 7175 CheckDestructor(Destructor); 7176 7177 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7178 Destructor->getParent()); 7179 } 7180 7181 // If any errors have occurred, clear out any temporaries that may have 7182 // been leftover. This ensures that these temporaries won't be picked up for 7183 // deletion in some later function. 7184 if (PP.getDiagnostics().hasErrorOccurred() || 7185 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7186 ExprTemporaries.clear(); 7187 ExprNeedsCleanups = false; 7188 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7189 // Since the body is valid, issue any analysis-based warnings that are 7190 // enabled. 7191 ActivePolicy = &WP; 7192 } 7193 7194 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7195 !CheckConstexprFunctionBody(FD, Body)) 7196 FD->setInvalidDecl(); 7197 7198 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7199 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7200 } 7201 7202 if (!IsInstantiation) 7203 PopDeclContext(); 7204 7205 PopFunctionOrBlockScope(ActivePolicy, dcl); 7206 7207 // If any errors have occurred, clear out any temporaries that may have 7208 // been leftover. This ensures that these temporaries won't be picked up for 7209 // deletion in some later function. 7210 if (getDiagnostics().hasErrorOccurred()) { 7211 ExprTemporaries.clear(); 7212 ExprNeedsCleanups = false; 7213 } 7214 7215 return dcl; 7216} 7217 7218 7219/// When we finish delayed parsing of an attribute, we must attach it to the 7220/// relevant Decl. 7221void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7222 ParsedAttributes &Attrs) { 7223 ProcessDeclAttributeList(S, D, Attrs.getList()); 7224} 7225 7226 7227/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7228/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7229NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7230 IdentifierInfo &II, Scope *S) { 7231 // Before we produce a declaration for an implicitly defined 7232 // function, see whether there was a locally-scoped declaration of 7233 // this name as a function or variable. If so, use that 7234 // (non-visible) declaration, and complain about it. 7235 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7236 = findLocallyScopedExternalDecl(&II); 7237 if (Pos != LocallyScopedExternalDecls.end()) { 7238 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7239 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7240 return Pos->second; 7241 } 7242 7243 // Extension in C99. Legal in C90, but warn about it. 7244 if (II.getName().startswith("__builtin_")) 7245 Diag(Loc, diag::warn_builtin_unknown) << &II; 7246 else if (getLangOptions().C99) 7247 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7248 else 7249 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7250 7251 // Set a Declarator for the implicit definition: int foo(); 7252 const char *Dummy; 7253 AttributeFactory attrFactory; 7254 DeclSpec DS(attrFactory); 7255 unsigned DiagID; 7256 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7257 (void)Error; // Silence warning. 7258 assert(!Error && "Error setting up implicit decl!"); 7259 Declarator D(DS, Declarator::BlockContext); 7260 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7261 0, 0, true, SourceLocation(), 7262 SourceLocation(), SourceLocation(), 7263 SourceLocation(), 7264 EST_None, SourceLocation(), 7265 0, 0, 0, 0, Loc, Loc, D), 7266 DS.getAttributes(), 7267 SourceLocation()); 7268 D.SetIdentifier(&II, Loc); 7269 7270 // Insert this function into translation-unit scope. 7271 7272 DeclContext *PrevDC = CurContext; 7273 CurContext = Context.getTranslationUnitDecl(); 7274 7275 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7276 FD->setImplicit(); 7277 7278 CurContext = PrevDC; 7279 7280 AddKnownFunctionAttributes(FD); 7281 7282 return FD; 7283} 7284 7285/// \brief Adds any function attributes that we know a priori based on 7286/// the declaration of this function. 7287/// 7288/// These attributes can apply both to implicitly-declared builtins 7289/// (like __builtin___printf_chk) or to library-declared functions 7290/// like NSLog or printf. 7291/// 7292/// We need to check for duplicate attributes both here and where user-written 7293/// attributes are applied to declarations. 7294void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7295 if (FD->isInvalidDecl()) 7296 return; 7297 7298 // If this is a built-in function, map its builtin attributes to 7299 // actual attributes. 7300 if (unsigned BuiltinID = FD->getBuiltinID()) { 7301 // Handle printf-formatting attributes. 7302 unsigned FormatIdx; 7303 bool HasVAListArg; 7304 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7305 if (!FD->getAttr<FormatAttr>()) 7306 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7307 "printf", FormatIdx+1, 7308 HasVAListArg ? 0 : FormatIdx+2)); 7309 } 7310 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7311 HasVAListArg)) { 7312 if (!FD->getAttr<FormatAttr>()) 7313 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7314 "scanf", FormatIdx+1, 7315 HasVAListArg ? 0 : FormatIdx+2)); 7316 } 7317 7318 // Mark const if we don't care about errno and that is the only 7319 // thing preventing the function from being const. This allows 7320 // IRgen to use LLVM intrinsics for such functions. 7321 if (!getLangOptions().MathErrno && 7322 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7323 if (!FD->getAttr<ConstAttr>()) 7324 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7325 } 7326 7327 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7328 !FD->getAttr<ReturnsTwiceAttr>()) 7329 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7330 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7331 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7332 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7333 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7334 } 7335 7336 IdentifierInfo *Name = FD->getIdentifier(); 7337 if (!Name) 7338 return; 7339 if ((!getLangOptions().CPlusPlus && 7340 FD->getDeclContext()->isTranslationUnit()) || 7341 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7342 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7343 LinkageSpecDecl::lang_c)) { 7344 // Okay: this could be a libc/libm/Objective-C function we know 7345 // about. 7346 } else 7347 return; 7348 7349 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7350 // FIXME: NSLog and NSLogv should be target specific 7351 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7352 // FIXME: We known better than our headers. 7353 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7354 } else 7355 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7356 "printf", 1, 7357 Name->isStr("NSLogv") ? 0 : 2)); 7358 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7359 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7360 // target-specific builtins, perhaps? 7361 if (!FD->getAttr<FormatAttr>()) 7362 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7363 "printf", 2, 7364 Name->isStr("vasprintf") ? 0 : 3)); 7365 } 7366} 7367 7368TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7369 TypeSourceInfo *TInfo) { 7370 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7371 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7372 7373 if (!TInfo) { 7374 assert(D.isInvalidType() && "no declarator info for valid type"); 7375 TInfo = Context.getTrivialTypeSourceInfo(T); 7376 } 7377 7378 // Scope manipulation handled by caller. 7379 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7380 D.getSourceRange().getBegin(), 7381 D.getIdentifierLoc(), 7382 D.getIdentifier(), 7383 TInfo); 7384 7385 // Bail out immediately if we have an invalid declaration. 7386 if (D.isInvalidType()) { 7387 NewTD->setInvalidDecl(); 7388 return NewTD; 7389 } 7390 7391 if (D.getDeclSpec().isModulePrivateSpecified()) { 7392 if (CurContext->isFunctionOrMethod()) 7393 Diag(NewTD->getLocation(), diag::err_module_private_local) 7394 << 2 << NewTD->getDeclName() 7395 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7396 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7397 else 7398 NewTD->setModulePrivate(); 7399 } 7400 7401 // C++ [dcl.typedef]p8: 7402 // If the typedef declaration defines an unnamed class (or 7403 // enum), the first typedef-name declared by the declaration 7404 // to be that class type (or enum type) is used to denote the 7405 // class type (or enum type) for linkage purposes only. 7406 // We need to check whether the type was declared in the declaration. 7407 switch (D.getDeclSpec().getTypeSpecType()) { 7408 case TST_enum: 7409 case TST_struct: 7410 case TST_union: 7411 case TST_class: { 7412 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7413 7414 // Do nothing if the tag is not anonymous or already has an 7415 // associated typedef (from an earlier typedef in this decl group). 7416 if (tagFromDeclSpec->getIdentifier()) break; 7417 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7418 7419 // A well-formed anonymous tag must always be a TUK_Definition. 7420 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7421 7422 // The type must match the tag exactly; no qualifiers allowed. 7423 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7424 break; 7425 7426 // Otherwise, set this is the anon-decl typedef for the tag. 7427 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7428 break; 7429 } 7430 7431 default: 7432 break; 7433 } 7434 7435 return NewTD; 7436} 7437 7438 7439/// \brief Determine whether a tag with a given kind is acceptable 7440/// as a redeclaration of the given tag declaration. 7441/// 7442/// \returns true if the new tag kind is acceptable, false otherwise. 7443bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7444 TagTypeKind NewTag, bool isDefinition, 7445 SourceLocation NewTagLoc, 7446 const IdentifierInfo &Name) { 7447 // C++ [dcl.type.elab]p3: 7448 // The class-key or enum keyword present in the 7449 // elaborated-type-specifier shall agree in kind with the 7450 // declaration to which the name in the elaborated-type-specifier 7451 // refers. This rule also applies to the form of 7452 // elaborated-type-specifier that declares a class-name or 7453 // friend class since it can be construed as referring to the 7454 // definition of the class. Thus, in any 7455 // elaborated-type-specifier, the enum keyword shall be used to 7456 // refer to an enumeration (7.2), the union class-key shall be 7457 // used to refer to a union (clause 9), and either the class or 7458 // struct class-key shall be used to refer to a class (clause 9) 7459 // declared using the class or struct class-key. 7460 TagTypeKind OldTag = Previous->getTagKind(); 7461 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7462 if (OldTag == NewTag) 7463 return true; 7464 7465 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7466 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7467 // Warn about the struct/class tag mismatch. 7468 bool isTemplate = false; 7469 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7470 isTemplate = Record->getDescribedClassTemplate(); 7471 7472 if (!ActiveTemplateInstantiations.empty()) { 7473 // In a template instantiation, do not offer fix-its for tag mismatches 7474 // since they usually mess up the template instead of fixing the problem. 7475 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7476 << (NewTag == TTK_Class) << isTemplate << &Name; 7477 return true; 7478 } 7479 7480 if (isDefinition) { 7481 // On definitions, check previous tags and issue a fix-it for each 7482 // one that doesn't match the current tag. 7483 if (Previous->getDefinition()) { 7484 // Don't suggest fix-its for redefinitions. 7485 return true; 7486 } 7487 7488 bool previousMismatch = false; 7489 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7490 E(Previous->redecls_end()); I != E; ++I) { 7491 if (I->getTagKind() != NewTag) { 7492 if (!previousMismatch) { 7493 previousMismatch = true; 7494 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7495 << (NewTag == TTK_Class) << isTemplate << &Name; 7496 } 7497 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7498 << (NewTag == TTK_Class) 7499 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7500 NewTag == TTK_Class? 7501 "class" : "struct"); 7502 } 7503 } 7504 return true; 7505 } 7506 7507 // Check for a previous definition. If current tag and definition 7508 // are same type, do nothing. If no definition, but disagree with 7509 // with previous tag type, give a warning, but no fix-it. 7510 const TagDecl *Redecl = Previous->getDefinition() ? 7511 Previous->getDefinition() : Previous; 7512 if (Redecl->getTagKind() == NewTag) { 7513 return true; 7514 } 7515 7516 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7517 << (NewTag == TTK_Class) 7518 << isTemplate << &Name; 7519 Diag(Redecl->getLocation(), diag::note_previous_use); 7520 7521 // If there is a previous defintion, suggest a fix-it. 7522 if (Previous->getDefinition()) { 7523 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7524 << (Redecl->getTagKind() == TTK_Class) 7525 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7526 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7527 } 7528 7529 return true; 7530 } 7531 return false; 7532} 7533 7534/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7535/// former case, Name will be non-null. In the later case, Name will be null. 7536/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7537/// reference/declaration/definition of a tag. 7538Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7539 SourceLocation KWLoc, CXXScopeSpec &SS, 7540 IdentifierInfo *Name, SourceLocation NameLoc, 7541 AttributeList *Attr, AccessSpecifier AS, 7542 SourceLocation ModulePrivateLoc, 7543 MultiTemplateParamsArg TemplateParameterLists, 7544 bool &OwnedDecl, bool &IsDependent, 7545 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7546 TypeResult UnderlyingType) { 7547 // If this is not a definition, it must have a name. 7548 assert((Name != 0 || TUK == TUK_Definition) && 7549 "Nameless record must be a definition!"); 7550 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7551 7552 OwnedDecl = false; 7553 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7554 7555 // FIXME: Check explicit specializations more carefully. 7556 bool isExplicitSpecialization = false; 7557 bool Invalid = false; 7558 7559 // We only need to do this matching if we have template parameters 7560 // or a scope specifier, which also conveniently avoids this work 7561 // for non-C++ cases. 7562 if (TemplateParameterLists.size() > 0 || 7563 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7564 if (TemplateParameterList *TemplateParams 7565 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7566 TemplateParameterLists.get(), 7567 TemplateParameterLists.size(), 7568 TUK == TUK_Friend, 7569 isExplicitSpecialization, 7570 Invalid)) { 7571 if (TemplateParams->size() > 0) { 7572 // This is a declaration or definition of a class template (which may 7573 // be a member of another template). 7574 7575 if (Invalid) 7576 return 0; 7577 7578 OwnedDecl = false; 7579 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7580 SS, Name, NameLoc, Attr, 7581 TemplateParams, AS, 7582 ModulePrivateLoc, 7583 TemplateParameterLists.size() - 1, 7584 (TemplateParameterList**) TemplateParameterLists.release()); 7585 return Result.get(); 7586 } else { 7587 // The "template<>" header is extraneous. 7588 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7589 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7590 isExplicitSpecialization = true; 7591 } 7592 } 7593 } 7594 7595 // Figure out the underlying type if this a enum declaration. We need to do 7596 // this early, because it's needed to detect if this is an incompatible 7597 // redeclaration. 7598 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7599 7600 if (Kind == TTK_Enum) { 7601 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7602 // No underlying type explicitly specified, or we failed to parse the 7603 // type, default to int. 7604 EnumUnderlying = Context.IntTy.getTypePtr(); 7605 else if (UnderlyingType.get()) { 7606 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7607 // integral type; any cv-qualification is ignored. 7608 TypeSourceInfo *TI = 0; 7609 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7610 EnumUnderlying = TI; 7611 7612 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7613 7614 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7615 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7616 << T; 7617 // Recover by falling back to int. 7618 EnumUnderlying = Context.IntTy.getTypePtr(); 7619 } 7620 7621 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7622 UPPC_FixedUnderlyingType)) 7623 EnumUnderlying = Context.IntTy.getTypePtr(); 7624 7625 } else if (getLangOptions().MicrosoftExt) 7626 // Microsoft enums are always of int type. 7627 EnumUnderlying = Context.IntTy.getTypePtr(); 7628 } 7629 7630 DeclContext *SearchDC = CurContext; 7631 DeclContext *DC = CurContext; 7632 bool isStdBadAlloc = false; 7633 7634 RedeclarationKind Redecl = ForRedeclaration; 7635 if (TUK == TUK_Friend || TUK == TUK_Reference) 7636 Redecl = NotForRedeclaration; 7637 7638 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7639 7640 if (Name && SS.isNotEmpty()) { 7641 // We have a nested-name tag ('struct foo::bar'). 7642 7643 // Check for invalid 'foo::'. 7644 if (SS.isInvalid()) { 7645 Name = 0; 7646 goto CreateNewDecl; 7647 } 7648 7649 // If this is a friend or a reference to a class in a dependent 7650 // context, don't try to make a decl for it. 7651 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7652 DC = computeDeclContext(SS, false); 7653 if (!DC) { 7654 IsDependent = true; 7655 return 0; 7656 } 7657 } else { 7658 DC = computeDeclContext(SS, true); 7659 if (!DC) { 7660 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7661 << SS.getRange(); 7662 return 0; 7663 } 7664 } 7665 7666 if (RequireCompleteDeclContext(SS, DC)) 7667 return 0; 7668 7669 SearchDC = DC; 7670 // Look-up name inside 'foo::'. 7671 LookupQualifiedName(Previous, DC); 7672 7673 if (Previous.isAmbiguous()) 7674 return 0; 7675 7676 if (Previous.empty()) { 7677 // Name lookup did not find anything. However, if the 7678 // nested-name-specifier refers to the current instantiation, 7679 // and that current instantiation has any dependent base 7680 // classes, we might find something at instantiation time: treat 7681 // this as a dependent elaborated-type-specifier. 7682 // But this only makes any sense for reference-like lookups. 7683 if (Previous.wasNotFoundInCurrentInstantiation() && 7684 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7685 IsDependent = true; 7686 return 0; 7687 } 7688 7689 // A tag 'foo::bar' must already exist. 7690 Diag(NameLoc, diag::err_not_tag_in_scope) 7691 << Kind << Name << DC << SS.getRange(); 7692 Name = 0; 7693 Invalid = true; 7694 goto CreateNewDecl; 7695 } 7696 } else if (Name) { 7697 // If this is a named struct, check to see if there was a previous forward 7698 // declaration or definition. 7699 // FIXME: We're looking into outer scopes here, even when we 7700 // shouldn't be. Doing so can result in ambiguities that we 7701 // shouldn't be diagnosing. 7702 LookupName(Previous, S); 7703 7704 if (Previous.isAmbiguous() && 7705 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7706 LookupResult::Filter F = Previous.makeFilter(); 7707 while (F.hasNext()) { 7708 NamedDecl *ND = F.next(); 7709 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7710 F.erase(); 7711 } 7712 F.done(); 7713 } 7714 7715 // Note: there used to be some attempt at recovery here. 7716 if (Previous.isAmbiguous()) 7717 return 0; 7718 7719 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7720 // FIXME: This makes sure that we ignore the contexts associated 7721 // with C structs, unions, and enums when looking for a matching 7722 // tag declaration or definition. See the similar lookup tweak 7723 // in Sema::LookupName; is there a better way to deal with this? 7724 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7725 SearchDC = SearchDC->getParent(); 7726 } 7727 } else if (S->isFunctionPrototypeScope()) { 7728 // If this is an enum declaration in function prototype scope, set its 7729 // initial context to the translation unit. 7730 SearchDC = Context.getTranslationUnitDecl(); 7731 } 7732 7733 if (Previous.isSingleResult() && 7734 Previous.getFoundDecl()->isTemplateParameter()) { 7735 // Maybe we will complain about the shadowed template parameter. 7736 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7737 // Just pretend that we didn't see the previous declaration. 7738 Previous.clear(); 7739 } 7740 7741 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7742 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7743 // This is a declaration of or a reference to "std::bad_alloc". 7744 isStdBadAlloc = true; 7745 7746 if (Previous.empty() && StdBadAlloc) { 7747 // std::bad_alloc has been implicitly declared (but made invisible to 7748 // name lookup). Fill in this implicit declaration as the previous 7749 // declaration, so that the declarations get chained appropriately. 7750 Previous.addDecl(getStdBadAlloc()); 7751 } 7752 } 7753 7754 // If we didn't find a previous declaration, and this is a reference 7755 // (or friend reference), move to the correct scope. In C++, we 7756 // also need to do a redeclaration lookup there, just in case 7757 // there's a shadow friend decl. 7758 if (Name && Previous.empty() && 7759 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7760 if (Invalid) goto CreateNewDecl; 7761 assert(SS.isEmpty()); 7762 7763 if (TUK == TUK_Reference) { 7764 // C++ [basic.scope.pdecl]p5: 7765 // -- for an elaborated-type-specifier of the form 7766 // 7767 // class-key identifier 7768 // 7769 // if the elaborated-type-specifier is used in the 7770 // decl-specifier-seq or parameter-declaration-clause of a 7771 // function defined in namespace scope, the identifier is 7772 // declared as a class-name in the namespace that contains 7773 // the declaration; otherwise, except as a friend 7774 // declaration, the identifier is declared in the smallest 7775 // non-class, non-function-prototype scope that contains the 7776 // declaration. 7777 // 7778 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7779 // C structs and unions. 7780 // 7781 // It is an error in C++ to declare (rather than define) an enum 7782 // type, including via an elaborated type specifier. We'll 7783 // diagnose that later; for now, declare the enum in the same 7784 // scope as we would have picked for any other tag type. 7785 // 7786 // GNU C also supports this behavior as part of its incomplete 7787 // enum types extension, while GNU C++ does not. 7788 // 7789 // Find the context where we'll be declaring the tag. 7790 // FIXME: We would like to maintain the current DeclContext as the 7791 // lexical context, 7792 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7793 SearchDC = SearchDC->getParent(); 7794 7795 // Find the scope where we'll be declaring the tag. 7796 while (S->isClassScope() || 7797 (getLangOptions().CPlusPlus && 7798 S->isFunctionPrototypeScope()) || 7799 ((S->getFlags() & Scope::DeclScope) == 0) || 7800 (S->getEntity() && 7801 ((DeclContext *)S->getEntity())->isTransparentContext())) 7802 S = S->getParent(); 7803 } else { 7804 assert(TUK == TUK_Friend); 7805 // C++ [namespace.memdef]p3: 7806 // If a friend declaration in a non-local class first declares a 7807 // class or function, the friend class or function is a member of 7808 // the innermost enclosing namespace. 7809 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7810 } 7811 7812 // In C++, we need to do a redeclaration lookup to properly 7813 // diagnose some problems. 7814 if (getLangOptions().CPlusPlus) { 7815 Previous.setRedeclarationKind(ForRedeclaration); 7816 LookupQualifiedName(Previous, SearchDC); 7817 } 7818 } 7819 7820 if (!Previous.empty()) { 7821 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7822 7823 // It's okay to have a tag decl in the same scope as a typedef 7824 // which hides a tag decl in the same scope. Finding this 7825 // insanity with a redeclaration lookup can only actually happen 7826 // in C++. 7827 // 7828 // This is also okay for elaborated-type-specifiers, which is 7829 // technically forbidden by the current standard but which is 7830 // okay according to the likely resolution of an open issue; 7831 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7832 if (getLangOptions().CPlusPlus) { 7833 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7834 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7835 TagDecl *Tag = TT->getDecl(); 7836 if (Tag->getDeclName() == Name && 7837 Tag->getDeclContext()->getRedeclContext() 7838 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7839 PrevDecl = Tag; 7840 Previous.clear(); 7841 Previous.addDecl(Tag); 7842 Previous.resolveKind(); 7843 } 7844 } 7845 } 7846 } 7847 7848 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7849 // If this is a use of a previous tag, or if the tag is already declared 7850 // in the same scope (so that the definition/declaration completes or 7851 // rementions the tag), reuse the decl. 7852 if (TUK == TUK_Reference || TUK == TUK_Friend || 7853 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7854 // Make sure that this wasn't declared as an enum and now used as a 7855 // struct or something similar. 7856 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7857 TUK == TUK_Definition, KWLoc, 7858 *Name)) { 7859 bool SafeToContinue 7860 = (PrevTagDecl->getTagKind() != TTK_Enum && 7861 Kind != TTK_Enum); 7862 if (SafeToContinue) 7863 Diag(KWLoc, diag::err_use_with_wrong_tag) 7864 << Name 7865 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7866 PrevTagDecl->getKindName()); 7867 else 7868 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7869 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7870 7871 if (SafeToContinue) 7872 Kind = PrevTagDecl->getTagKind(); 7873 else { 7874 // Recover by making this an anonymous redefinition. 7875 Name = 0; 7876 Previous.clear(); 7877 Invalid = true; 7878 } 7879 } 7880 7881 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7882 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7883 7884 // All conflicts with previous declarations are recovered by 7885 // returning the previous declaration. 7886 if (ScopedEnum != PrevEnum->isScoped()) { 7887 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7888 << PrevEnum->isScoped(); 7889 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7890 return PrevTagDecl; 7891 } 7892 else if (EnumUnderlying && PrevEnum->isFixed()) { 7893 QualType T; 7894 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7895 T = TI->getType(); 7896 else 7897 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7898 7899 if (!Context.hasSameUnqualifiedType(T, 7900 PrevEnum->getIntegerType())) { 7901 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7902 diag::err_enum_redeclare_type_mismatch) 7903 << T 7904 << PrevEnum->getIntegerType(); 7905 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7906 return PrevTagDecl; 7907 } 7908 } 7909 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7910 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7911 << PrevEnum->isFixed(); 7912 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7913 return PrevTagDecl; 7914 } 7915 } 7916 7917 if (!Invalid) { 7918 // If this is a use, just return the declaration we found. 7919 7920 // FIXME: In the future, return a variant or some other clue 7921 // for the consumer of this Decl to know it doesn't own it. 7922 // For our current ASTs this shouldn't be a problem, but will 7923 // need to be changed with DeclGroups. 7924 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7925 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7926 return PrevTagDecl; 7927 7928 // Diagnose attempts to redefine a tag. 7929 if (TUK == TUK_Definition) { 7930 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7931 // If we're defining a specialization and the previous definition 7932 // is from an implicit instantiation, don't emit an error 7933 // here; we'll catch this in the general case below. 7934 if (!isExplicitSpecialization || 7935 !isa<CXXRecordDecl>(Def) || 7936 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7937 == TSK_ExplicitSpecialization) { 7938 Diag(NameLoc, diag::err_redefinition) << Name; 7939 Diag(Def->getLocation(), diag::note_previous_definition); 7940 // If this is a redefinition, recover by making this 7941 // struct be anonymous, which will make any later 7942 // references get the previous definition. 7943 Name = 0; 7944 Previous.clear(); 7945 Invalid = true; 7946 } 7947 } else { 7948 // If the type is currently being defined, complain 7949 // about a nested redefinition. 7950 const TagType *Tag 7951 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7952 if (Tag->isBeingDefined()) { 7953 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7954 Diag(PrevTagDecl->getLocation(), 7955 diag::note_previous_definition); 7956 Name = 0; 7957 Previous.clear(); 7958 Invalid = true; 7959 } 7960 } 7961 7962 // Okay, this is definition of a previously declared or referenced 7963 // tag PrevDecl. We're going to create a new Decl for it. 7964 } 7965 } 7966 // If we get here we have (another) forward declaration or we 7967 // have a definition. Just create a new decl. 7968 7969 } else { 7970 // If we get here, this is a definition of a new tag type in a nested 7971 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7972 // new decl/type. We set PrevDecl to NULL so that the entities 7973 // have distinct types. 7974 Previous.clear(); 7975 } 7976 // If we get here, we're going to create a new Decl. If PrevDecl 7977 // is non-NULL, it's a definition of the tag declared by 7978 // PrevDecl. If it's NULL, we have a new definition. 7979 7980 7981 // Otherwise, PrevDecl is not a tag, but was found with tag 7982 // lookup. This is only actually possible in C++, where a few 7983 // things like templates still live in the tag namespace. 7984 } else { 7985 assert(getLangOptions().CPlusPlus); 7986 7987 // Use a better diagnostic if an elaborated-type-specifier 7988 // found the wrong kind of type on the first 7989 // (non-redeclaration) lookup. 7990 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7991 !Previous.isForRedeclaration()) { 7992 unsigned Kind = 0; 7993 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7994 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7995 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7996 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7997 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7998 Invalid = true; 7999 8000 // Otherwise, only diagnose if the declaration is in scope. 8001 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8002 isExplicitSpecialization)) { 8003 // do nothing 8004 8005 // Diagnose implicit declarations introduced by elaborated types. 8006 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8007 unsigned Kind = 0; 8008 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8009 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8010 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8011 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8012 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8013 Invalid = true; 8014 8015 // Otherwise it's a declaration. Call out a particularly common 8016 // case here. 8017 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8018 unsigned Kind = 0; 8019 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8020 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8021 << Name << Kind << TND->getUnderlyingType(); 8022 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8023 Invalid = true; 8024 8025 // Otherwise, diagnose. 8026 } else { 8027 // The tag name clashes with something else in the target scope, 8028 // issue an error and recover by making this tag be anonymous. 8029 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8030 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8031 Name = 0; 8032 Invalid = true; 8033 } 8034 8035 // The existing declaration isn't relevant to us; we're in a 8036 // new scope, so clear out the previous declaration. 8037 Previous.clear(); 8038 } 8039 } 8040 8041CreateNewDecl: 8042 8043 TagDecl *PrevDecl = 0; 8044 if (Previous.isSingleResult()) 8045 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8046 8047 // If there is an identifier, use the location of the identifier as the 8048 // location of the decl, otherwise use the location of the struct/union 8049 // keyword. 8050 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8051 8052 // Otherwise, create a new declaration. If there is a previous 8053 // declaration of the same entity, the two will be linked via 8054 // PrevDecl. 8055 TagDecl *New; 8056 8057 bool IsForwardReference = false; 8058 if (Kind == TTK_Enum) { 8059 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8060 // enum X { A, B, C } D; D should chain to X. 8061 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8062 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8063 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8064 // If this is an undefined enum, warn. 8065 if (TUK != TUK_Definition && !Invalid) { 8066 TagDecl *Def; 8067 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8068 // C++0x: 7.2p2: opaque-enum-declaration. 8069 // Conflicts are diagnosed above. Do nothing. 8070 } 8071 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8072 Diag(Loc, diag::ext_forward_ref_enum_def) 8073 << New; 8074 Diag(Def->getLocation(), diag::note_previous_definition); 8075 } else { 8076 unsigned DiagID = diag::ext_forward_ref_enum; 8077 if (getLangOptions().MicrosoftExt) 8078 DiagID = diag::ext_ms_forward_ref_enum; 8079 else if (getLangOptions().CPlusPlus) 8080 DiagID = diag::err_forward_ref_enum; 8081 Diag(Loc, DiagID); 8082 8083 // If this is a forward-declared reference to an enumeration, make a 8084 // note of it; we won't actually be introducing the declaration into 8085 // the declaration context. 8086 if (TUK == TUK_Reference) 8087 IsForwardReference = true; 8088 } 8089 } 8090 8091 if (EnumUnderlying) { 8092 EnumDecl *ED = cast<EnumDecl>(New); 8093 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8094 ED->setIntegerTypeSourceInfo(TI); 8095 else 8096 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8097 ED->setPromotionType(ED->getIntegerType()); 8098 } 8099 8100 } else { 8101 // struct/union/class 8102 8103 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8104 // struct X { int A; } D; D should chain to X. 8105 if (getLangOptions().CPlusPlus) { 8106 // FIXME: Look for a way to use RecordDecl for simple structs. 8107 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8108 cast_or_null<CXXRecordDecl>(PrevDecl)); 8109 8110 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8111 StdBadAlloc = cast<CXXRecordDecl>(New); 8112 } else 8113 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8114 cast_or_null<RecordDecl>(PrevDecl)); 8115 } 8116 8117 // Maybe add qualifier info. 8118 if (SS.isNotEmpty()) { 8119 if (SS.isSet()) { 8120 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8121 if (TemplateParameterLists.size() > 0) { 8122 New->setTemplateParameterListsInfo(Context, 8123 TemplateParameterLists.size(), 8124 (TemplateParameterList**) TemplateParameterLists.release()); 8125 } 8126 } 8127 else 8128 Invalid = true; 8129 } 8130 8131 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8132 // Add alignment attributes if necessary; these attributes are checked when 8133 // the ASTContext lays out the structure. 8134 // 8135 // It is important for implementing the correct semantics that this 8136 // happen here (in act on tag decl). The #pragma pack stack is 8137 // maintained as a result of parser callbacks which can occur at 8138 // many points during the parsing of a struct declaration (because 8139 // the #pragma tokens are effectively skipped over during the 8140 // parsing of the struct). 8141 AddAlignmentAttributesForRecord(RD); 8142 8143 AddMsStructLayoutForRecord(RD); 8144 } 8145 8146 if (PrevDecl && PrevDecl->isModulePrivate()) 8147 New->setModulePrivate(); 8148 else if (ModulePrivateLoc.isValid()) { 8149 if (isExplicitSpecialization) 8150 Diag(New->getLocation(), diag::err_module_private_specialization) 8151 << 2 8152 << FixItHint::CreateRemoval(ModulePrivateLoc); 8153 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8154 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8155 // __module_private__ does not apply to local classes. However, we only 8156 // diagnose this as an error when the declaration specifiers are 8157 // freestanding. Here, we just ignore the __module_private__. 8158 // foobar 8159 else if (!SearchDC->isFunctionOrMethod()) 8160 New->setModulePrivate(); 8161 } 8162 8163 // If this is a specialization of a member class (of a class template), 8164 // check the specialization. 8165 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8166 Invalid = true; 8167 8168 if (Invalid) 8169 New->setInvalidDecl(); 8170 8171 if (Attr) 8172 ProcessDeclAttributeList(S, New, Attr); 8173 8174 // If we're declaring or defining a tag in function prototype scope 8175 // in C, note that this type can only be used within the function. 8176 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8177 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8178 8179 // Set the lexical context. If the tag has a C++ scope specifier, the 8180 // lexical context will be different from the semantic context. 8181 New->setLexicalDeclContext(CurContext); 8182 8183 // Mark this as a friend decl if applicable. 8184 // In Microsoft mode, a friend declaration also acts as a forward 8185 // declaration so we always pass true to setObjectOfFriendDecl to make 8186 // the tag name visible. 8187 if (TUK == TUK_Friend) 8188 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8189 getLangOptions().MicrosoftExt); 8190 8191 // Set the access specifier. 8192 if (!Invalid && SearchDC->isRecord()) 8193 SetMemberAccessSpecifier(New, PrevDecl, AS); 8194 8195 if (TUK == TUK_Definition) 8196 New->startDefinition(); 8197 8198 // If this has an identifier, add it to the scope stack. 8199 if (TUK == TUK_Friend) { 8200 // We might be replacing an existing declaration in the lookup tables; 8201 // if so, borrow its access specifier. 8202 if (PrevDecl) 8203 New->setAccess(PrevDecl->getAccess()); 8204 8205 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8206 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8207 if (Name) // can be null along some error paths 8208 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8209 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8210 } else if (Name) { 8211 S = getNonFieldDeclScope(S); 8212 PushOnScopeChains(New, S, !IsForwardReference); 8213 if (IsForwardReference) 8214 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8215 8216 } else { 8217 CurContext->addDecl(New); 8218 } 8219 8220 // If this is the C FILE type, notify the AST context. 8221 if (IdentifierInfo *II = New->getIdentifier()) 8222 if (!New->isInvalidDecl() && 8223 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8224 II->isStr("FILE")) 8225 Context.setFILEDecl(New); 8226 8227 OwnedDecl = true; 8228 return New; 8229} 8230 8231void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8232 AdjustDeclIfTemplate(TagD); 8233 TagDecl *Tag = cast<TagDecl>(TagD); 8234 8235 // Enter the tag context. 8236 PushDeclContext(S, Tag); 8237} 8238 8239Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8240 assert(isa<ObjCContainerDecl>(IDecl) && 8241 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8242 DeclContext *OCD = cast<DeclContext>(IDecl); 8243 assert(getContainingDC(OCD) == CurContext && 8244 "The next DeclContext should be lexically contained in the current one."); 8245 CurContext = OCD; 8246 return IDecl; 8247} 8248 8249void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8250 SourceLocation FinalLoc, 8251 SourceLocation LBraceLoc) { 8252 AdjustDeclIfTemplate(TagD); 8253 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8254 8255 FieldCollector->StartClass(); 8256 8257 if (!Record->getIdentifier()) 8258 return; 8259 8260 if (FinalLoc.isValid()) 8261 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8262 8263 // C++ [class]p2: 8264 // [...] The class-name is also inserted into the scope of the 8265 // class itself; this is known as the injected-class-name. For 8266 // purposes of access checking, the injected-class-name is treated 8267 // as if it were a public member name. 8268 CXXRecordDecl *InjectedClassName 8269 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8270 Record->getLocStart(), Record->getLocation(), 8271 Record->getIdentifier(), 8272 /*PrevDecl=*/0, 8273 /*DelayTypeCreation=*/true); 8274 Context.getTypeDeclType(InjectedClassName, Record); 8275 InjectedClassName->setImplicit(); 8276 InjectedClassName->setAccess(AS_public); 8277 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8278 InjectedClassName->setDescribedClassTemplate(Template); 8279 PushOnScopeChains(InjectedClassName, S); 8280 assert(InjectedClassName->isInjectedClassName() && 8281 "Broken injected-class-name"); 8282} 8283 8284void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8285 SourceLocation RBraceLoc) { 8286 AdjustDeclIfTemplate(TagD); 8287 TagDecl *Tag = cast<TagDecl>(TagD); 8288 Tag->setRBraceLoc(RBraceLoc); 8289 8290 if (isa<CXXRecordDecl>(Tag)) 8291 FieldCollector->FinishClass(); 8292 8293 // Exit this scope of this tag's definition. 8294 PopDeclContext(); 8295 8296 // Notify the consumer that we've defined a tag. 8297 Consumer.HandleTagDeclDefinition(Tag); 8298} 8299 8300void Sema::ActOnObjCContainerFinishDefinition() { 8301 // Exit this scope of this interface definition. 8302 PopDeclContext(); 8303} 8304 8305void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8306 assert(DC == CurContext && "Mismatch of container contexts"); 8307 OriginalLexicalContext = DC; 8308 ActOnObjCContainerFinishDefinition(); 8309} 8310 8311void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8312 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8313 OriginalLexicalContext = 0; 8314} 8315 8316void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8317 AdjustDeclIfTemplate(TagD); 8318 TagDecl *Tag = cast<TagDecl>(TagD); 8319 Tag->setInvalidDecl(); 8320 8321 // We're undoing ActOnTagStartDefinition here, not 8322 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8323 // the FieldCollector. 8324 8325 PopDeclContext(); 8326} 8327 8328// Note that FieldName may be null for anonymous bitfields. 8329bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8330 QualType FieldTy, const Expr *BitWidth, 8331 bool *ZeroWidth) { 8332 // Default to true; that shouldn't confuse checks for emptiness 8333 if (ZeroWidth) 8334 *ZeroWidth = true; 8335 8336 // C99 6.7.2.1p4 - verify the field type. 8337 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8338 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8339 // Handle incomplete types with specific error. 8340 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8341 return true; 8342 if (FieldName) 8343 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8344 << FieldName << FieldTy << BitWidth->getSourceRange(); 8345 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8346 << FieldTy << BitWidth->getSourceRange(); 8347 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8348 UPPC_BitFieldWidth)) 8349 return true; 8350 8351 // If the bit-width is type- or value-dependent, don't try to check 8352 // it now. 8353 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8354 return false; 8355 8356 llvm::APSInt Value; 8357 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8358 return true; 8359 8360 if (Value != 0 && ZeroWidth) 8361 *ZeroWidth = false; 8362 8363 // Zero-width bitfield is ok for anonymous field. 8364 if (Value == 0 && FieldName) 8365 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8366 8367 if (Value.isSigned() && Value.isNegative()) { 8368 if (FieldName) 8369 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8370 << FieldName << Value.toString(10); 8371 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8372 << Value.toString(10); 8373 } 8374 8375 if (!FieldTy->isDependentType()) { 8376 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8377 if (Value.getZExtValue() > TypeSize) { 8378 if (!getLangOptions().CPlusPlus) { 8379 if (FieldName) 8380 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8381 << FieldName << (unsigned)Value.getZExtValue() 8382 << (unsigned)TypeSize; 8383 8384 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8385 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8386 } 8387 8388 if (FieldName) 8389 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8390 << FieldName << (unsigned)Value.getZExtValue() 8391 << (unsigned)TypeSize; 8392 else 8393 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8394 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8395 } 8396 } 8397 8398 return false; 8399} 8400 8401/// ActOnField - Each field of a C struct/union is passed into this in order 8402/// to create a FieldDecl object for it. 8403Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8404 Declarator &D, Expr *BitfieldWidth) { 8405 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8406 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8407 /*HasInit=*/false, AS_public); 8408 return Res; 8409} 8410 8411/// HandleField - Analyze a field of a C struct or a C++ data member. 8412/// 8413FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8414 SourceLocation DeclStart, 8415 Declarator &D, Expr *BitWidth, bool HasInit, 8416 AccessSpecifier AS) { 8417 IdentifierInfo *II = D.getIdentifier(); 8418 SourceLocation Loc = DeclStart; 8419 if (II) Loc = D.getIdentifierLoc(); 8420 8421 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8422 QualType T = TInfo->getType(); 8423 if (getLangOptions().CPlusPlus) { 8424 CheckExtraCXXDefaultArguments(D); 8425 8426 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8427 UPPC_DataMemberType)) { 8428 D.setInvalidType(); 8429 T = Context.IntTy; 8430 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8431 } 8432 } 8433 8434 DiagnoseFunctionSpecifiers(D); 8435 8436 if (D.getDeclSpec().isThreadSpecified()) 8437 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8438 if (D.getDeclSpec().isConstexprSpecified()) 8439 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8440 << 2; 8441 8442 // Check to see if this name was declared as a member previously 8443 NamedDecl *PrevDecl = 0; 8444 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8445 LookupName(Previous, S); 8446 switch (Previous.getResultKind()) { 8447 case LookupResult::Found: 8448 case LookupResult::FoundUnresolvedValue: 8449 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8450 break; 8451 8452 case LookupResult::FoundOverloaded: 8453 PrevDecl = Previous.getRepresentativeDecl(); 8454 break; 8455 8456 case LookupResult::NotFound: 8457 case LookupResult::NotFoundInCurrentInstantiation: 8458 case LookupResult::Ambiguous: 8459 break; 8460 } 8461 Previous.suppressDiagnostics(); 8462 8463 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8464 // Maybe we will complain about the shadowed template parameter. 8465 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8466 // Just pretend that we didn't see the previous declaration. 8467 PrevDecl = 0; 8468 } 8469 8470 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8471 PrevDecl = 0; 8472 8473 bool Mutable 8474 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8475 SourceLocation TSSL = D.getSourceRange().getBegin(); 8476 FieldDecl *NewFD 8477 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8478 TSSL, AS, PrevDecl, &D); 8479 8480 if (NewFD->isInvalidDecl()) 8481 Record->setInvalidDecl(); 8482 8483 if (D.getDeclSpec().isModulePrivateSpecified()) 8484 NewFD->setModulePrivate(); 8485 8486 if (NewFD->isInvalidDecl() && PrevDecl) { 8487 // Don't introduce NewFD into scope; there's already something 8488 // with the same name in the same scope. 8489 } else if (II) { 8490 PushOnScopeChains(NewFD, S); 8491 } else 8492 Record->addDecl(NewFD); 8493 8494 return NewFD; 8495} 8496 8497/// \brief Build a new FieldDecl and check its well-formedness. 8498/// 8499/// This routine builds a new FieldDecl given the fields name, type, 8500/// record, etc. \p PrevDecl should refer to any previous declaration 8501/// with the same name and in the same scope as the field to be 8502/// created. 8503/// 8504/// \returns a new FieldDecl. 8505/// 8506/// \todo The Declarator argument is a hack. It will be removed once 8507FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8508 TypeSourceInfo *TInfo, 8509 RecordDecl *Record, SourceLocation Loc, 8510 bool Mutable, Expr *BitWidth, bool HasInit, 8511 SourceLocation TSSL, 8512 AccessSpecifier AS, NamedDecl *PrevDecl, 8513 Declarator *D) { 8514 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8515 bool InvalidDecl = false; 8516 if (D) InvalidDecl = D->isInvalidType(); 8517 8518 // If we receive a broken type, recover by assuming 'int' and 8519 // marking this declaration as invalid. 8520 if (T.isNull()) { 8521 InvalidDecl = true; 8522 T = Context.IntTy; 8523 } 8524 8525 QualType EltTy = Context.getBaseElementType(T); 8526 if (!EltTy->isDependentType() && 8527 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8528 // Fields of incomplete type force their record to be invalid. 8529 Record->setInvalidDecl(); 8530 InvalidDecl = true; 8531 } 8532 8533 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8534 // than a variably modified type. 8535 if (!InvalidDecl && T->isVariablyModifiedType()) { 8536 bool SizeIsNegative; 8537 llvm::APSInt Oversized; 8538 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8539 SizeIsNegative, 8540 Oversized); 8541 if (!FixedTy.isNull()) { 8542 Diag(Loc, diag::warn_illegal_constant_array_size); 8543 T = FixedTy; 8544 } else { 8545 if (SizeIsNegative) 8546 Diag(Loc, diag::err_typecheck_negative_array_size); 8547 else if (Oversized.getBoolValue()) 8548 Diag(Loc, diag::err_array_too_large) 8549 << Oversized.toString(10); 8550 else 8551 Diag(Loc, diag::err_typecheck_field_variable_size); 8552 InvalidDecl = true; 8553 } 8554 } 8555 8556 // Fields can not have abstract class types 8557 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8558 diag::err_abstract_type_in_decl, 8559 AbstractFieldType)) 8560 InvalidDecl = true; 8561 8562 bool ZeroWidth = false; 8563 // If this is declared as a bit-field, check the bit-field. 8564 if (!InvalidDecl && BitWidth && 8565 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8566 InvalidDecl = true; 8567 BitWidth = 0; 8568 ZeroWidth = false; 8569 } 8570 8571 // Check that 'mutable' is consistent with the type of the declaration. 8572 if (!InvalidDecl && Mutable) { 8573 unsigned DiagID = 0; 8574 if (T->isReferenceType()) 8575 DiagID = diag::err_mutable_reference; 8576 else if (T.isConstQualified()) 8577 DiagID = diag::err_mutable_const; 8578 8579 if (DiagID) { 8580 SourceLocation ErrLoc = Loc; 8581 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8582 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8583 Diag(ErrLoc, DiagID); 8584 Mutable = false; 8585 InvalidDecl = true; 8586 } 8587 } 8588 8589 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8590 BitWidth, Mutable, HasInit); 8591 if (InvalidDecl) 8592 NewFD->setInvalidDecl(); 8593 8594 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8595 Diag(Loc, diag::err_duplicate_member) << II; 8596 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8597 NewFD->setInvalidDecl(); 8598 } 8599 8600 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8601 if (Record->isUnion()) { 8602 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8603 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8604 if (RDecl->getDefinition()) { 8605 // C++ [class.union]p1: An object of a class with a non-trivial 8606 // constructor, a non-trivial copy constructor, a non-trivial 8607 // destructor, or a non-trivial copy assignment operator 8608 // cannot be a member of a union, nor can an array of such 8609 // objects. 8610 if (CheckNontrivialField(NewFD)) 8611 NewFD->setInvalidDecl(); 8612 } 8613 } 8614 8615 // C++ [class.union]p1: If a union contains a member of reference type, 8616 // the program is ill-formed. 8617 if (EltTy->isReferenceType()) { 8618 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8619 << NewFD->getDeclName() << EltTy; 8620 NewFD->setInvalidDecl(); 8621 } 8622 } 8623 } 8624 8625 // FIXME: We need to pass in the attributes given an AST 8626 // representation, not a parser representation. 8627 if (D) 8628 // FIXME: What to pass instead of TUScope? 8629 ProcessDeclAttributes(TUScope, NewFD, *D); 8630 8631 // In auto-retain/release, infer strong retension for fields of 8632 // retainable type. 8633 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8634 NewFD->setInvalidDecl(); 8635 8636 if (T.isObjCGCWeak()) 8637 Diag(Loc, diag::warn_attribute_weak_on_field); 8638 8639 NewFD->setAccess(AS); 8640 return NewFD; 8641} 8642 8643bool Sema::CheckNontrivialField(FieldDecl *FD) { 8644 assert(FD); 8645 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8646 8647 if (FD->isInvalidDecl()) 8648 return true; 8649 8650 QualType EltTy = Context.getBaseElementType(FD->getType()); 8651 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8652 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8653 if (RDecl->getDefinition()) { 8654 // We check for copy constructors before constructors 8655 // because otherwise we'll never get complaints about 8656 // copy constructors. 8657 8658 CXXSpecialMember member = CXXInvalid; 8659 if (!RDecl->hasTrivialCopyConstructor()) 8660 member = CXXCopyConstructor; 8661 else if (!RDecl->hasTrivialDefaultConstructor()) 8662 member = CXXDefaultConstructor; 8663 else if (!RDecl->hasTrivialCopyAssignment()) 8664 member = CXXCopyAssignment; 8665 else if (!RDecl->hasTrivialDestructor()) 8666 member = CXXDestructor; 8667 8668 if (member != CXXInvalid) { 8669 if (!getLangOptions().CPlusPlus0x && 8670 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8671 // Objective-C++ ARC: it is an error to have a non-trivial field of 8672 // a union. However, system headers in Objective-C programs 8673 // occasionally have Objective-C lifetime objects within unions, 8674 // and rather than cause the program to fail, we make those 8675 // members unavailable. 8676 SourceLocation Loc = FD->getLocation(); 8677 if (getSourceManager().isInSystemHeader(Loc)) { 8678 if (!FD->hasAttr<UnavailableAttr>()) 8679 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8680 "this system field has retaining ownership")); 8681 return false; 8682 } 8683 } 8684 8685 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8686 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8687 diag::err_illegal_union_or_anon_struct_member) 8688 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8689 DiagnoseNontrivial(RT, member); 8690 return !getLangOptions().CPlusPlus0x; 8691 } 8692 } 8693 } 8694 8695 return false; 8696} 8697 8698/// DiagnoseNontrivial - Given that a class has a non-trivial 8699/// special member, figure out why. 8700void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8701 QualType QT(T, 0U); 8702 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8703 8704 // Check whether the member was user-declared. 8705 switch (member) { 8706 case CXXInvalid: 8707 break; 8708 8709 case CXXDefaultConstructor: 8710 if (RD->hasUserDeclaredConstructor()) { 8711 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8712 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8713 const FunctionDecl *body = 0; 8714 ci->hasBody(body); 8715 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8716 SourceLocation CtorLoc = ci->getLocation(); 8717 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8718 return; 8719 } 8720 } 8721 8722 llvm_unreachable("found no user-declared constructors"); 8723 } 8724 break; 8725 8726 case CXXCopyConstructor: 8727 if (RD->hasUserDeclaredCopyConstructor()) { 8728 SourceLocation CtorLoc = 8729 RD->getCopyConstructor(0)->getLocation(); 8730 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8731 return; 8732 } 8733 break; 8734 8735 case CXXMoveConstructor: 8736 if (RD->hasUserDeclaredMoveConstructor()) { 8737 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8738 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8739 return; 8740 } 8741 break; 8742 8743 case CXXCopyAssignment: 8744 if (RD->hasUserDeclaredCopyAssignment()) { 8745 // FIXME: this should use the location of the copy 8746 // assignment, not the type. 8747 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8748 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8749 return; 8750 } 8751 break; 8752 8753 case CXXMoveAssignment: 8754 if (RD->hasUserDeclaredMoveAssignment()) { 8755 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8756 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8757 return; 8758 } 8759 break; 8760 8761 case CXXDestructor: 8762 if (RD->hasUserDeclaredDestructor()) { 8763 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8764 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8765 return; 8766 } 8767 break; 8768 } 8769 8770 typedef CXXRecordDecl::base_class_iterator base_iter; 8771 8772 // Virtual bases and members inhibit trivial copying/construction, 8773 // but not trivial destruction. 8774 if (member != CXXDestructor) { 8775 // Check for virtual bases. vbases includes indirect virtual bases, 8776 // so we just iterate through the direct bases. 8777 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8778 if (bi->isVirtual()) { 8779 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8780 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8781 return; 8782 } 8783 8784 // Check for virtual methods. 8785 typedef CXXRecordDecl::method_iterator meth_iter; 8786 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8787 ++mi) { 8788 if (mi->isVirtual()) { 8789 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8790 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8791 return; 8792 } 8793 } 8794 } 8795 8796 bool (CXXRecordDecl::*hasTrivial)() const; 8797 switch (member) { 8798 case CXXDefaultConstructor: 8799 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8800 case CXXCopyConstructor: 8801 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8802 case CXXCopyAssignment: 8803 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8804 case CXXDestructor: 8805 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8806 default: 8807 llvm_unreachable("unexpected special member"); 8808 } 8809 8810 // Check for nontrivial bases (and recurse). 8811 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8812 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8813 assert(BaseRT && "Don't know how to handle dependent bases"); 8814 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8815 if (!(BaseRecTy->*hasTrivial)()) { 8816 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8817 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8818 DiagnoseNontrivial(BaseRT, member); 8819 return; 8820 } 8821 } 8822 8823 // Check for nontrivial members (and recurse). 8824 typedef RecordDecl::field_iterator field_iter; 8825 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8826 ++fi) { 8827 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8828 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8829 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8830 8831 if (!(EltRD->*hasTrivial)()) { 8832 SourceLocation FLoc = (*fi)->getLocation(); 8833 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8834 DiagnoseNontrivial(EltRT, member); 8835 return; 8836 } 8837 } 8838 8839 if (EltTy->isObjCLifetimeType()) { 8840 switch (EltTy.getObjCLifetime()) { 8841 case Qualifiers::OCL_None: 8842 case Qualifiers::OCL_ExplicitNone: 8843 break; 8844 8845 case Qualifiers::OCL_Autoreleasing: 8846 case Qualifiers::OCL_Weak: 8847 case Qualifiers::OCL_Strong: 8848 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8849 << QT << EltTy.getObjCLifetime(); 8850 return; 8851 } 8852 } 8853 } 8854 8855 llvm_unreachable("found no explanation for non-trivial member"); 8856} 8857 8858/// TranslateIvarVisibility - Translate visibility from a token ID to an 8859/// AST enum value. 8860static ObjCIvarDecl::AccessControl 8861TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8862 switch (ivarVisibility) { 8863 default: llvm_unreachable("Unknown visitibility kind"); 8864 case tok::objc_private: return ObjCIvarDecl::Private; 8865 case tok::objc_public: return ObjCIvarDecl::Public; 8866 case tok::objc_protected: return ObjCIvarDecl::Protected; 8867 case tok::objc_package: return ObjCIvarDecl::Package; 8868 } 8869} 8870 8871/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8872/// in order to create an IvarDecl object for it. 8873Decl *Sema::ActOnIvar(Scope *S, 8874 SourceLocation DeclStart, 8875 Declarator &D, Expr *BitfieldWidth, 8876 tok::ObjCKeywordKind Visibility) { 8877 8878 IdentifierInfo *II = D.getIdentifier(); 8879 Expr *BitWidth = (Expr*)BitfieldWidth; 8880 SourceLocation Loc = DeclStart; 8881 if (II) Loc = D.getIdentifierLoc(); 8882 8883 // FIXME: Unnamed fields can be handled in various different ways, for 8884 // example, unnamed unions inject all members into the struct namespace! 8885 8886 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8887 QualType T = TInfo->getType(); 8888 8889 if (BitWidth) { 8890 // 6.7.2.1p3, 6.7.2.1p4 8891 if (VerifyBitField(Loc, II, T, BitWidth)) { 8892 D.setInvalidType(); 8893 BitWidth = 0; 8894 } 8895 } else { 8896 // Not a bitfield. 8897 8898 // validate II. 8899 8900 } 8901 if (T->isReferenceType()) { 8902 Diag(Loc, diag::err_ivar_reference_type); 8903 D.setInvalidType(); 8904 } 8905 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8906 // than a variably modified type. 8907 else if (T->isVariablyModifiedType()) { 8908 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8909 D.setInvalidType(); 8910 } 8911 8912 // Get the visibility (access control) for this ivar. 8913 ObjCIvarDecl::AccessControl ac = 8914 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8915 : ObjCIvarDecl::None; 8916 // Must set ivar's DeclContext to its enclosing interface. 8917 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8918 ObjCContainerDecl *EnclosingContext; 8919 if (ObjCImplementationDecl *IMPDecl = 8920 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8921 if (!LangOpts.ObjCNonFragileABI2) { 8922 // Case of ivar declared in an implementation. Context is that of its class. 8923 EnclosingContext = IMPDecl->getClassInterface(); 8924 assert(EnclosingContext && "Implementation has no class interface!"); 8925 } 8926 else 8927 EnclosingContext = EnclosingDecl; 8928 } else { 8929 if (ObjCCategoryDecl *CDecl = 8930 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8931 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8932 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8933 return 0; 8934 } 8935 } 8936 EnclosingContext = EnclosingDecl; 8937 } 8938 8939 // Construct the decl. 8940 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8941 DeclStart, Loc, II, T, 8942 TInfo, ac, (Expr *)BitfieldWidth); 8943 8944 if (II) { 8945 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8946 ForRedeclaration); 8947 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8948 && !isa<TagDecl>(PrevDecl)) { 8949 Diag(Loc, diag::err_duplicate_member) << II; 8950 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8951 NewID->setInvalidDecl(); 8952 } 8953 } 8954 8955 // Process attributes attached to the ivar. 8956 ProcessDeclAttributes(S, NewID, D); 8957 8958 if (D.isInvalidType()) 8959 NewID->setInvalidDecl(); 8960 8961 // In ARC, infer 'retaining' for ivars of retainable type. 8962 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8963 NewID->setInvalidDecl(); 8964 8965 if (D.getDeclSpec().isModulePrivateSpecified()) 8966 NewID->setModulePrivate(); 8967 8968 if (II) { 8969 // FIXME: When interfaces are DeclContexts, we'll need to add 8970 // these to the interface. 8971 S->AddDecl(NewID); 8972 IdResolver.AddDecl(NewID); 8973 } 8974 8975 return NewID; 8976} 8977 8978/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8979/// class and class extensions. For every class @interface and class 8980/// extension @interface, if the last ivar is a bitfield of any type, 8981/// then add an implicit `char :0` ivar to the end of that interface. 8982void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8983 SmallVectorImpl<Decl *> &AllIvarDecls) { 8984 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8985 return; 8986 8987 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8988 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8989 8990 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8991 return; 8992 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8993 if (!ID) { 8994 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8995 if (!CD->IsClassExtension()) 8996 return; 8997 } 8998 // No need to add this to end of @implementation. 8999 else 9000 return; 9001 } 9002 // All conditions are met. Add a new bitfield to the tail end of ivars. 9003 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9004 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9005 9006 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9007 DeclLoc, DeclLoc, 0, 9008 Context.CharTy, 9009 Context.getTrivialTypeSourceInfo(Context.CharTy, 9010 DeclLoc), 9011 ObjCIvarDecl::Private, BW, 9012 true); 9013 AllIvarDecls.push_back(Ivar); 9014} 9015 9016void Sema::ActOnFields(Scope* S, 9017 SourceLocation RecLoc, Decl *EnclosingDecl, 9018 llvm::ArrayRef<Decl *> Fields, 9019 SourceLocation LBrac, SourceLocation RBrac, 9020 AttributeList *Attr) { 9021 assert(EnclosingDecl && "missing record or interface decl"); 9022 9023 // If the decl this is being inserted into is invalid, then it may be a 9024 // redeclaration or some other bogus case. Don't try to add fields to it. 9025 if (EnclosingDecl->isInvalidDecl()) 9026 return; 9027 9028 // Verify that all the fields are okay. 9029 unsigned NumNamedMembers = 0; 9030 SmallVector<FieldDecl*, 32> RecFields; 9031 9032 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9033 bool ARCErrReported = false; 9034 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9035 i != end; ++i) { 9036 FieldDecl *FD = cast<FieldDecl>(*i); 9037 9038 // Get the type for the field. 9039 const Type *FDTy = FD->getType().getTypePtr(); 9040 9041 if (!FD->isAnonymousStructOrUnion()) { 9042 // Remember all fields written by the user. 9043 RecFields.push_back(FD); 9044 } 9045 9046 // If the field is already invalid for some reason, don't emit more 9047 // diagnostics about it. 9048 if (FD->isInvalidDecl()) { 9049 EnclosingDecl->setInvalidDecl(); 9050 continue; 9051 } 9052 9053 // C99 6.7.2.1p2: 9054 // A structure or union shall not contain a member with 9055 // incomplete or function type (hence, a structure shall not 9056 // contain an instance of itself, but may contain a pointer to 9057 // an instance of itself), except that the last member of a 9058 // structure with more than one named member may have incomplete 9059 // array type; such a structure (and any union containing, 9060 // possibly recursively, a member that is such a structure) 9061 // shall not be a member of a structure or an element of an 9062 // array. 9063 if (FDTy->isFunctionType()) { 9064 // Field declared as a function. 9065 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9066 << FD->getDeclName(); 9067 FD->setInvalidDecl(); 9068 EnclosingDecl->setInvalidDecl(); 9069 continue; 9070 } else if (FDTy->isIncompleteArrayType() && Record && 9071 ((i + 1 == Fields.end() && !Record->isUnion()) || 9072 ((getLangOptions().MicrosoftExt || 9073 getLangOptions().CPlusPlus) && 9074 (i + 1 == Fields.end() || Record->isUnion())))) { 9075 // Flexible array member. 9076 // Microsoft and g++ is more permissive regarding flexible array. 9077 // It will accept flexible array in union and also 9078 // as the sole element of a struct/class. 9079 if (getLangOptions().MicrosoftExt) { 9080 if (Record->isUnion()) 9081 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9082 << FD->getDeclName(); 9083 else if (Fields.size() == 1) 9084 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9085 << FD->getDeclName() << Record->getTagKind(); 9086 } else if (getLangOptions().CPlusPlus) { 9087 if (Record->isUnion()) 9088 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9089 << FD->getDeclName(); 9090 else if (Fields.size() == 1) 9091 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9092 << FD->getDeclName() << Record->getTagKind(); 9093 } else if (NumNamedMembers < 1) { 9094 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9095 << FD->getDeclName(); 9096 FD->setInvalidDecl(); 9097 EnclosingDecl->setInvalidDecl(); 9098 continue; 9099 } 9100 if (!FD->getType()->isDependentType() && 9101 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9102 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9103 << FD->getDeclName() << FD->getType(); 9104 FD->setInvalidDecl(); 9105 EnclosingDecl->setInvalidDecl(); 9106 continue; 9107 } 9108 // Okay, we have a legal flexible array member at the end of the struct. 9109 if (Record) 9110 Record->setHasFlexibleArrayMember(true); 9111 } else if (!FDTy->isDependentType() && 9112 RequireCompleteType(FD->getLocation(), FD->getType(), 9113 diag::err_field_incomplete)) { 9114 // Incomplete type 9115 FD->setInvalidDecl(); 9116 EnclosingDecl->setInvalidDecl(); 9117 continue; 9118 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9119 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9120 // If this is a member of a union, then entire union becomes "flexible". 9121 if (Record && Record->isUnion()) { 9122 Record->setHasFlexibleArrayMember(true); 9123 } else { 9124 // If this is a struct/class and this is not the last element, reject 9125 // it. Note that GCC supports variable sized arrays in the middle of 9126 // structures. 9127 if (i + 1 != Fields.end()) 9128 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9129 << FD->getDeclName() << FD->getType(); 9130 else { 9131 // We support flexible arrays at the end of structs in 9132 // other structs as an extension. 9133 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9134 << FD->getDeclName(); 9135 if (Record) 9136 Record->setHasFlexibleArrayMember(true); 9137 } 9138 } 9139 } 9140 if (Record && FDTTy->getDecl()->hasObjectMember()) 9141 Record->setHasObjectMember(true); 9142 } else if (FDTy->isObjCObjectType()) { 9143 /// A field cannot be an Objective-c object 9144 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9145 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9146 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9147 FD->setType(T); 9148 } 9149 else if (!getLangOptions().CPlusPlus) { 9150 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9151 // It's an error in ARC if a field has lifetime. 9152 // We don't want to report this in a system header, though, 9153 // so we just make the field unavailable. 9154 // FIXME: that's really not sufficient; we need to make the type 9155 // itself invalid to, say, initialize or copy. 9156 QualType T = FD->getType(); 9157 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9158 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9159 SourceLocation loc = FD->getLocation(); 9160 if (getSourceManager().isInSystemHeader(loc)) { 9161 if (!FD->hasAttr<UnavailableAttr>()) { 9162 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9163 "this system field has retaining ownership")); 9164 } 9165 } else { 9166 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9167 } 9168 ARCErrReported = true; 9169 } 9170 } 9171 else if (getLangOptions().ObjC1 && 9172 getLangOptions().getGC() != LangOptions::NonGC && 9173 Record && !Record->hasObjectMember()) { 9174 if (FD->getType()->isObjCObjectPointerType() || 9175 FD->getType().isObjCGCStrong()) 9176 Record->setHasObjectMember(true); 9177 else if (Context.getAsArrayType(FD->getType())) { 9178 QualType BaseType = Context.getBaseElementType(FD->getType()); 9179 if (BaseType->isRecordType() && 9180 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9181 Record->setHasObjectMember(true); 9182 else if (BaseType->isObjCObjectPointerType() || 9183 BaseType.isObjCGCStrong()) 9184 Record->setHasObjectMember(true); 9185 } 9186 } 9187 } 9188 // Keep track of the number of named members. 9189 if (FD->getIdentifier()) 9190 ++NumNamedMembers; 9191 } 9192 9193 // Okay, we successfully defined 'Record'. 9194 if (Record) { 9195 bool Completed = false; 9196 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9197 if (!CXXRecord->isInvalidDecl()) { 9198 // Set access bits correctly on the directly-declared conversions. 9199 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9200 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9201 I != E; ++I) 9202 Convs->setAccess(I, (*I)->getAccess()); 9203 9204 if (!CXXRecord->isDependentType()) { 9205 // Objective-C Automatic Reference Counting: 9206 // If a class has a non-static data member of Objective-C pointer 9207 // type (or array thereof), it is a non-POD type and its 9208 // default constructor (if any), copy constructor, copy assignment 9209 // operator, and destructor are non-trivial. 9210 // 9211 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9212 // However, here we check whether this particular class is only 9213 // non-POD because of the presence of an Objective-C pointer member. 9214 // If so, objects of this type cannot be shared between code compiled 9215 // with instant objects and code compiled with manual retain/release. 9216 if (getLangOptions().ObjCAutoRefCount && 9217 CXXRecord->hasObjectMember() && 9218 CXXRecord->getLinkage() == ExternalLinkage) { 9219 if (CXXRecord->isPOD()) { 9220 Diag(CXXRecord->getLocation(), 9221 diag::warn_arc_non_pod_class_with_object_member) 9222 << CXXRecord; 9223 } else { 9224 // FIXME: Fix-Its would be nice here, but finding a good location 9225 // for them is going to be tricky. 9226 if (CXXRecord->hasTrivialCopyConstructor()) 9227 Diag(CXXRecord->getLocation(), 9228 diag::warn_arc_trivial_member_function_with_object_member) 9229 << CXXRecord << 0; 9230 if (CXXRecord->hasTrivialCopyAssignment()) 9231 Diag(CXXRecord->getLocation(), 9232 diag::warn_arc_trivial_member_function_with_object_member) 9233 << CXXRecord << 1; 9234 if (CXXRecord->hasTrivialDestructor()) 9235 Diag(CXXRecord->getLocation(), 9236 diag::warn_arc_trivial_member_function_with_object_member) 9237 << CXXRecord << 2; 9238 } 9239 } 9240 9241 // Adjust user-defined destructor exception spec. 9242 if (getLangOptions().CPlusPlus0x && 9243 CXXRecord->hasUserDeclaredDestructor()) 9244 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9245 9246 // Add any implicitly-declared members to this class. 9247 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9248 9249 // If we have virtual base classes, we may end up finding multiple 9250 // final overriders for a given virtual function. Check for this 9251 // problem now. 9252 if (CXXRecord->getNumVBases()) { 9253 CXXFinalOverriderMap FinalOverriders; 9254 CXXRecord->getFinalOverriders(FinalOverriders); 9255 9256 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9257 MEnd = FinalOverriders.end(); 9258 M != MEnd; ++M) { 9259 for (OverridingMethods::iterator SO = M->second.begin(), 9260 SOEnd = M->second.end(); 9261 SO != SOEnd; ++SO) { 9262 assert(SO->second.size() > 0 && 9263 "Virtual function without overridding functions?"); 9264 if (SO->second.size() == 1) 9265 continue; 9266 9267 // C++ [class.virtual]p2: 9268 // In a derived class, if a virtual member function of a base 9269 // class subobject has more than one final overrider the 9270 // program is ill-formed. 9271 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9272 << (NamedDecl *)M->first << Record; 9273 Diag(M->first->getLocation(), 9274 diag::note_overridden_virtual_function); 9275 for (OverridingMethods::overriding_iterator 9276 OM = SO->second.begin(), 9277 OMEnd = SO->second.end(); 9278 OM != OMEnd; ++OM) 9279 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9280 << (NamedDecl *)M->first << OM->Method->getParent(); 9281 9282 Record->setInvalidDecl(); 9283 } 9284 } 9285 CXXRecord->completeDefinition(&FinalOverriders); 9286 Completed = true; 9287 } 9288 } 9289 } 9290 } 9291 9292 if (!Completed) 9293 Record->completeDefinition(); 9294 9295 // Now that the record is complete, do any delayed exception spec checks 9296 // we were missing. 9297 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9298 const CXXDestructorDecl *Dtor = 9299 DelayedDestructorExceptionSpecChecks.back().first; 9300 if (Dtor->getParent() != Record) 9301 break; 9302 9303 assert(!Dtor->getParent()->isDependentType() && 9304 "Should not ever add destructors of templates into the list."); 9305 CheckOverridingFunctionExceptionSpec(Dtor, 9306 DelayedDestructorExceptionSpecChecks.back().second); 9307 DelayedDestructorExceptionSpecChecks.pop_back(); 9308 } 9309 9310 } else { 9311 ObjCIvarDecl **ClsFields = 9312 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9313 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9314 ID->setLocEnd(RBrac); 9315 // Add ivar's to class's DeclContext. 9316 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9317 ClsFields[i]->setLexicalDeclContext(ID); 9318 ID->addDecl(ClsFields[i]); 9319 } 9320 // Must enforce the rule that ivars in the base classes may not be 9321 // duplicates. 9322 if (ID->getSuperClass()) 9323 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9324 } else if (ObjCImplementationDecl *IMPDecl = 9325 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9326 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9327 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9328 // Ivar declared in @implementation never belongs to the implementation. 9329 // Only it is in implementation's lexical context. 9330 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9331 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9332 } else if (ObjCCategoryDecl *CDecl = 9333 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9334 // case of ivars in class extension; all other cases have been 9335 // reported as errors elsewhere. 9336 // FIXME. Class extension does not have a LocEnd field. 9337 // CDecl->setLocEnd(RBrac); 9338 // Add ivar's to class extension's DeclContext. 9339 // Diagnose redeclaration of private ivars. 9340 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9341 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9342 if (IDecl) { 9343 if (const ObjCIvarDecl *ClsIvar = 9344 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9345 Diag(ClsFields[i]->getLocation(), 9346 diag::err_duplicate_ivar_declaration); 9347 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9348 continue; 9349 } 9350 for (const ObjCCategoryDecl *ClsExtDecl = 9351 IDecl->getFirstClassExtension(); 9352 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9353 if (const ObjCIvarDecl *ClsExtIvar = 9354 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9355 Diag(ClsFields[i]->getLocation(), 9356 diag::err_duplicate_ivar_declaration); 9357 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9358 continue; 9359 } 9360 } 9361 } 9362 ClsFields[i]->setLexicalDeclContext(CDecl); 9363 CDecl->addDecl(ClsFields[i]); 9364 } 9365 } 9366 } 9367 9368 if (Attr) 9369 ProcessDeclAttributeList(S, Record, Attr); 9370 9371 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9372 // set the visibility of this record. 9373 if (Record && !Record->getDeclContext()->isRecord()) 9374 AddPushedVisibilityAttribute(Record); 9375} 9376 9377/// \brief Determine whether the given integral value is representable within 9378/// the given type T. 9379static bool isRepresentableIntegerValue(ASTContext &Context, 9380 llvm::APSInt &Value, 9381 QualType T) { 9382 assert(T->isIntegralType(Context) && "Integral type required!"); 9383 unsigned BitWidth = Context.getIntWidth(T); 9384 9385 if (Value.isUnsigned() || Value.isNonNegative()) { 9386 if (T->isSignedIntegerOrEnumerationType()) 9387 --BitWidth; 9388 return Value.getActiveBits() <= BitWidth; 9389 } 9390 return Value.getMinSignedBits() <= BitWidth; 9391} 9392 9393// \brief Given an integral type, return the next larger integral type 9394// (or a NULL type of no such type exists). 9395static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9396 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9397 // enum checking below. 9398 assert(T->isIntegralType(Context) && "Integral type required!"); 9399 const unsigned NumTypes = 4; 9400 QualType SignedIntegralTypes[NumTypes] = { 9401 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9402 }; 9403 QualType UnsignedIntegralTypes[NumTypes] = { 9404 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9405 Context.UnsignedLongLongTy 9406 }; 9407 9408 unsigned BitWidth = Context.getTypeSize(T); 9409 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9410 : UnsignedIntegralTypes; 9411 for (unsigned I = 0; I != NumTypes; ++I) 9412 if (Context.getTypeSize(Types[I]) > BitWidth) 9413 return Types[I]; 9414 9415 return QualType(); 9416} 9417 9418EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9419 EnumConstantDecl *LastEnumConst, 9420 SourceLocation IdLoc, 9421 IdentifierInfo *Id, 9422 Expr *Val) { 9423 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9424 llvm::APSInt EnumVal(IntWidth); 9425 QualType EltTy; 9426 9427 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9428 Val = 0; 9429 9430 if (Val) { 9431 if (Enum->isDependentType() || Val->isTypeDependent()) 9432 EltTy = Context.DependentTy; 9433 else { 9434 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9435 SourceLocation ExpLoc; 9436 if (!Val->isValueDependent() && 9437 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9438 Val = 0; 9439 } else { 9440 if (!getLangOptions().CPlusPlus) { 9441 // C99 6.7.2.2p2: 9442 // The expression that defines the value of an enumeration constant 9443 // shall be an integer constant expression that has a value 9444 // representable as an int. 9445 9446 // Complain if the value is not representable in an int. 9447 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9448 Diag(IdLoc, diag::ext_enum_value_not_int) 9449 << EnumVal.toString(10) << Val->getSourceRange() 9450 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9451 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9452 // Force the type of the expression to 'int'. 9453 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9454 } 9455 } 9456 9457 if (Enum->isFixed()) { 9458 EltTy = Enum->getIntegerType(); 9459 9460 // C++0x [dcl.enum]p5: 9461 // ... if the initializing value of an enumerator cannot be 9462 // represented by the underlying type, the program is ill-formed. 9463 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9464 if (getLangOptions().MicrosoftExt) { 9465 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9466 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9467 } else 9468 Diag(IdLoc, diag::err_enumerator_too_large) 9469 << EltTy; 9470 } else 9471 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9472 } 9473 else { 9474 // C++0x [dcl.enum]p5: 9475 // If the underlying type is not fixed, the type of each enumerator 9476 // is the type of its initializing value: 9477 // - If an initializer is specified for an enumerator, the 9478 // initializing value has the same type as the expression. 9479 EltTy = Val->getType(); 9480 } 9481 } 9482 } 9483 } 9484 9485 if (!Val) { 9486 if (Enum->isDependentType()) 9487 EltTy = Context.DependentTy; 9488 else if (!LastEnumConst) { 9489 // C++0x [dcl.enum]p5: 9490 // If the underlying type is not fixed, the type of each enumerator 9491 // is the type of its initializing value: 9492 // - If no initializer is specified for the first enumerator, the 9493 // initializing value has an unspecified integral type. 9494 // 9495 // GCC uses 'int' for its unspecified integral type, as does 9496 // C99 6.7.2.2p3. 9497 if (Enum->isFixed()) { 9498 EltTy = Enum->getIntegerType(); 9499 } 9500 else { 9501 EltTy = Context.IntTy; 9502 } 9503 } else { 9504 // Assign the last value + 1. 9505 EnumVal = LastEnumConst->getInitVal(); 9506 ++EnumVal; 9507 EltTy = LastEnumConst->getType(); 9508 9509 // Check for overflow on increment. 9510 if (EnumVal < LastEnumConst->getInitVal()) { 9511 // C++0x [dcl.enum]p5: 9512 // If the underlying type is not fixed, the type of each enumerator 9513 // is the type of its initializing value: 9514 // 9515 // - Otherwise the type of the initializing value is the same as 9516 // the type of the initializing value of the preceding enumerator 9517 // unless the incremented value is not representable in that type, 9518 // in which case the type is an unspecified integral type 9519 // sufficient to contain the incremented value. If no such type 9520 // exists, the program is ill-formed. 9521 QualType T = getNextLargerIntegralType(Context, EltTy); 9522 if (T.isNull() || Enum->isFixed()) { 9523 // There is no integral type larger enough to represent this 9524 // value. Complain, then allow the value to wrap around. 9525 EnumVal = LastEnumConst->getInitVal(); 9526 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9527 ++EnumVal; 9528 if (Enum->isFixed()) 9529 // When the underlying type is fixed, this is ill-formed. 9530 Diag(IdLoc, diag::err_enumerator_wrapped) 9531 << EnumVal.toString(10) 9532 << EltTy; 9533 else 9534 Diag(IdLoc, diag::warn_enumerator_too_large) 9535 << EnumVal.toString(10); 9536 } else { 9537 EltTy = T; 9538 } 9539 9540 // Retrieve the last enumerator's value, extent that type to the 9541 // type that is supposed to be large enough to represent the incremented 9542 // value, then increment. 9543 EnumVal = LastEnumConst->getInitVal(); 9544 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9545 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9546 ++EnumVal; 9547 9548 // If we're not in C++, diagnose the overflow of enumerator values, 9549 // which in C99 means that the enumerator value is not representable in 9550 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9551 // permits enumerator values that are representable in some larger 9552 // integral type. 9553 if (!getLangOptions().CPlusPlus && !T.isNull()) 9554 Diag(IdLoc, diag::warn_enum_value_overflow); 9555 } else if (!getLangOptions().CPlusPlus && 9556 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9557 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9558 Diag(IdLoc, diag::ext_enum_value_not_int) 9559 << EnumVal.toString(10) << 1; 9560 } 9561 } 9562 } 9563 9564 if (!EltTy->isDependentType()) { 9565 // Make the enumerator value match the signedness and size of the 9566 // enumerator's type. 9567 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9568 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9569 } 9570 9571 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9572 Val, EnumVal); 9573} 9574 9575 9576Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9577 SourceLocation IdLoc, IdentifierInfo *Id, 9578 AttributeList *Attr, 9579 SourceLocation EqualLoc, Expr *val) { 9580 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9581 EnumConstantDecl *LastEnumConst = 9582 cast_or_null<EnumConstantDecl>(lastEnumConst); 9583 Expr *Val = static_cast<Expr*>(val); 9584 9585 // The scope passed in may not be a decl scope. Zip up the scope tree until 9586 // we find one that is. 9587 S = getNonFieldDeclScope(S); 9588 9589 // Verify that there isn't already something declared with this name in this 9590 // scope. 9591 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9592 ForRedeclaration); 9593 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9594 // Maybe we will complain about the shadowed template parameter. 9595 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9596 // Just pretend that we didn't see the previous declaration. 9597 PrevDecl = 0; 9598 } 9599 9600 if (PrevDecl) { 9601 // When in C++, we may get a TagDecl with the same name; in this case the 9602 // enum constant will 'hide' the tag. 9603 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9604 "Received TagDecl when not in C++!"); 9605 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9606 if (isa<EnumConstantDecl>(PrevDecl)) 9607 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9608 else 9609 Diag(IdLoc, diag::err_redefinition) << Id; 9610 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9611 return 0; 9612 } 9613 } 9614 9615 // C++ [class.mem]p13: 9616 // If T is the name of a class, then each of the following shall have a 9617 // name different from T: 9618 // - every enumerator of every member of class T that is an enumerated 9619 // type 9620 if (CXXRecordDecl *Record 9621 = dyn_cast<CXXRecordDecl>( 9622 TheEnumDecl->getDeclContext()->getRedeclContext())) 9623 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9624 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9625 9626 EnumConstantDecl *New = 9627 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9628 9629 if (New) { 9630 // Process attributes. 9631 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9632 9633 // Register this decl in the current scope stack. 9634 New->setAccess(TheEnumDecl->getAccess()); 9635 PushOnScopeChains(New, S); 9636 } 9637 9638 return New; 9639} 9640 9641void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9642 SourceLocation RBraceLoc, Decl *EnumDeclX, 9643 Decl **Elements, unsigned NumElements, 9644 Scope *S, AttributeList *Attr) { 9645 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9646 QualType EnumType = Context.getTypeDeclType(Enum); 9647 9648 if (Attr) 9649 ProcessDeclAttributeList(S, Enum, Attr); 9650 9651 if (Enum->isDependentType()) { 9652 for (unsigned i = 0; i != NumElements; ++i) { 9653 EnumConstantDecl *ECD = 9654 cast_or_null<EnumConstantDecl>(Elements[i]); 9655 if (!ECD) continue; 9656 9657 ECD->setType(EnumType); 9658 } 9659 9660 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9661 return; 9662 } 9663 9664 // TODO: If the result value doesn't fit in an int, it must be a long or long 9665 // long value. ISO C does not support this, but GCC does as an extension, 9666 // emit a warning. 9667 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9668 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9669 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9670 9671 // Verify that all the values are okay, compute the size of the values, and 9672 // reverse the list. 9673 unsigned NumNegativeBits = 0; 9674 unsigned NumPositiveBits = 0; 9675 9676 // Keep track of whether all elements have type int. 9677 bool AllElementsInt = true; 9678 9679 for (unsigned i = 0; i != NumElements; ++i) { 9680 EnumConstantDecl *ECD = 9681 cast_or_null<EnumConstantDecl>(Elements[i]); 9682 if (!ECD) continue; // Already issued a diagnostic. 9683 9684 const llvm::APSInt &InitVal = ECD->getInitVal(); 9685 9686 // Keep track of the size of positive and negative values. 9687 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9688 NumPositiveBits = std::max(NumPositiveBits, 9689 (unsigned)InitVal.getActiveBits()); 9690 else 9691 NumNegativeBits = std::max(NumNegativeBits, 9692 (unsigned)InitVal.getMinSignedBits()); 9693 9694 // Keep track of whether every enum element has type int (very commmon). 9695 if (AllElementsInt) 9696 AllElementsInt = ECD->getType() == Context.IntTy; 9697 } 9698 9699 // Figure out the type that should be used for this enum. 9700 QualType BestType; 9701 unsigned BestWidth; 9702 9703 // C++0x N3000 [conv.prom]p3: 9704 // An rvalue of an unscoped enumeration type whose underlying 9705 // type is not fixed can be converted to an rvalue of the first 9706 // of the following types that can represent all the values of 9707 // the enumeration: int, unsigned int, long int, unsigned long 9708 // int, long long int, or unsigned long long int. 9709 // C99 6.4.4.3p2: 9710 // An identifier declared as an enumeration constant has type int. 9711 // The C99 rule is modified by a gcc extension 9712 QualType BestPromotionType; 9713 9714 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9715 // -fshort-enums is the equivalent to specifying the packed attribute on all 9716 // enum definitions. 9717 if (LangOpts.ShortEnums) 9718 Packed = true; 9719 9720 if (Enum->isFixed()) { 9721 BestType = Enum->getIntegerType(); 9722 if (BestType->isPromotableIntegerType()) 9723 BestPromotionType = Context.getPromotedIntegerType(BestType); 9724 else 9725 BestPromotionType = BestType; 9726 // We don't need to set BestWidth, because BestType is going to be the type 9727 // of the enumerators, but we do anyway because otherwise some compilers 9728 // warn that it might be used uninitialized. 9729 BestWidth = CharWidth; 9730 } 9731 else if (NumNegativeBits) { 9732 // If there is a negative value, figure out the smallest integer type (of 9733 // int/long/longlong) that fits. 9734 // If it's packed, check also if it fits a char or a short. 9735 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9736 BestType = Context.SignedCharTy; 9737 BestWidth = CharWidth; 9738 } else if (Packed && NumNegativeBits <= ShortWidth && 9739 NumPositiveBits < ShortWidth) { 9740 BestType = Context.ShortTy; 9741 BestWidth = ShortWidth; 9742 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9743 BestType = Context.IntTy; 9744 BestWidth = IntWidth; 9745 } else { 9746 BestWidth = Context.getTargetInfo().getLongWidth(); 9747 9748 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9749 BestType = Context.LongTy; 9750 } else { 9751 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9752 9753 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9754 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9755 BestType = Context.LongLongTy; 9756 } 9757 } 9758 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9759 } else { 9760 // If there is no negative value, figure out the smallest type that fits 9761 // all of the enumerator values. 9762 // If it's packed, check also if it fits a char or a short. 9763 if (Packed && NumPositiveBits <= CharWidth) { 9764 BestType = Context.UnsignedCharTy; 9765 BestPromotionType = Context.IntTy; 9766 BestWidth = CharWidth; 9767 } else if (Packed && NumPositiveBits <= ShortWidth) { 9768 BestType = Context.UnsignedShortTy; 9769 BestPromotionType = Context.IntTy; 9770 BestWidth = ShortWidth; 9771 } else if (NumPositiveBits <= IntWidth) { 9772 BestType = Context.UnsignedIntTy; 9773 BestWidth = IntWidth; 9774 BestPromotionType 9775 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9776 ? Context.UnsignedIntTy : Context.IntTy; 9777 } else if (NumPositiveBits <= 9778 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9779 BestType = Context.UnsignedLongTy; 9780 BestPromotionType 9781 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9782 ? Context.UnsignedLongTy : Context.LongTy; 9783 } else { 9784 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9785 assert(NumPositiveBits <= BestWidth && 9786 "How could an initializer get larger than ULL?"); 9787 BestType = Context.UnsignedLongLongTy; 9788 BestPromotionType 9789 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9790 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9791 } 9792 } 9793 9794 // Loop over all of the enumerator constants, changing their types to match 9795 // the type of the enum if needed. 9796 for (unsigned i = 0; i != NumElements; ++i) { 9797 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9798 if (!ECD) continue; // Already issued a diagnostic. 9799 9800 // Standard C says the enumerators have int type, but we allow, as an 9801 // extension, the enumerators to be larger than int size. If each 9802 // enumerator value fits in an int, type it as an int, otherwise type it the 9803 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9804 // that X has type 'int', not 'unsigned'. 9805 9806 // Determine whether the value fits into an int. 9807 llvm::APSInt InitVal = ECD->getInitVal(); 9808 9809 // If it fits into an integer type, force it. Otherwise force it to match 9810 // the enum decl type. 9811 QualType NewTy; 9812 unsigned NewWidth; 9813 bool NewSign; 9814 if (!getLangOptions().CPlusPlus && 9815 !Enum->isFixed() && 9816 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9817 NewTy = Context.IntTy; 9818 NewWidth = IntWidth; 9819 NewSign = true; 9820 } else if (ECD->getType() == BestType) { 9821 // Already the right type! 9822 if (getLangOptions().CPlusPlus) 9823 // C++ [dcl.enum]p4: Following the closing brace of an 9824 // enum-specifier, each enumerator has the type of its 9825 // enumeration. 9826 ECD->setType(EnumType); 9827 continue; 9828 } else { 9829 NewTy = BestType; 9830 NewWidth = BestWidth; 9831 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9832 } 9833 9834 // Adjust the APSInt value. 9835 InitVal = InitVal.extOrTrunc(NewWidth); 9836 InitVal.setIsSigned(NewSign); 9837 ECD->setInitVal(InitVal); 9838 9839 // Adjust the Expr initializer and type. 9840 if (ECD->getInitExpr() && 9841 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9842 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9843 CK_IntegralCast, 9844 ECD->getInitExpr(), 9845 /*base paths*/ 0, 9846 VK_RValue)); 9847 if (getLangOptions().CPlusPlus) 9848 // C++ [dcl.enum]p4: Following the closing brace of an 9849 // enum-specifier, each enumerator has the type of its 9850 // enumeration. 9851 ECD->setType(EnumType); 9852 else 9853 ECD->setType(NewTy); 9854 } 9855 9856 Enum->completeDefinition(BestType, BestPromotionType, 9857 NumPositiveBits, NumNegativeBits); 9858} 9859 9860Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9861 SourceLocation StartLoc, 9862 SourceLocation EndLoc) { 9863 StringLiteral *AsmString = cast<StringLiteral>(expr); 9864 9865 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9866 AsmString, StartLoc, 9867 EndLoc); 9868 CurContext->addDecl(New); 9869 return New; 9870} 9871 9872DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9873 IdentifierInfo &ModuleName, 9874 SourceLocation ModuleNameLoc) { 9875 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9876 ModuleName, ModuleNameLoc); 9877 if (!Module) 9878 return true; 9879 9880 // FIXME: Actually create a declaration to describe the module import. 9881 (void)Module; 9882 return DeclResult((Decl *)0); 9883} 9884 9885void 9886Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9887 SourceLocation ModulePrivateKeyword) { 9888 assert(!Old->isModulePrivate() && "Old is module-private!"); 9889 9890 Diag(New->getLocation(), diag::err_module_private_follows_public) 9891 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9892 Diag(Old->getLocation(), diag::note_previous_declaration) 9893 << Old->getDeclName(); 9894 9895 // Drop the __module_private__ from the new declaration, since it's invalid. 9896 New->setModulePrivate(false); 9897} 9898 9899void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9900 SourceLocation PragmaLoc, 9901 SourceLocation NameLoc) { 9902 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9903 9904 if (PrevDecl) { 9905 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9906 } else { 9907 (void)WeakUndeclaredIdentifiers.insert( 9908 std::pair<IdentifierInfo*,WeakInfo> 9909 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9910 } 9911} 9912 9913void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9914 IdentifierInfo* AliasName, 9915 SourceLocation PragmaLoc, 9916 SourceLocation NameLoc, 9917 SourceLocation AliasNameLoc) { 9918 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9919 LookupOrdinaryName); 9920 WeakInfo W = WeakInfo(Name, NameLoc); 9921 9922 if (PrevDecl) { 9923 if (!PrevDecl->hasAttr<AliasAttr>()) 9924 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9925 DeclApplyPragmaWeak(TUScope, ND, W); 9926 } else { 9927 (void)WeakUndeclaredIdentifiers.insert( 9928 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9929 } 9930} 9931 9932Decl *Sema::getObjCDeclContext() const { 9933 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9934} 9935 9936AvailabilityResult Sema::getCurContextAvailability() const { 9937 const Decl *D = cast<Decl>(getCurLexicalContext()); 9938 // A category implicitly has the availability of the interface. 9939 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9940 D = CatD->getClassInterface(); 9941 9942 return D->getAvailability(); 9943} 9944