SemaDecl.cpp revision 06284c1dc56caed19850bc3766c89f51763724c3
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/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo, 74 IdentifierInfo **CorrectedII) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 if (CorrectedII) { 150 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 151 Kind, S, SS, 0, false, 152 Sema::CTC_Type); 153 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 154 TemplateTy Template; 155 bool MemberOfUnknownSpecialization; 156 UnqualifiedId TemplateName; 157 TemplateName.setIdentifier(NewII, NameLoc); 158 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 159 CXXScopeSpec NewSS, *NewSSPtr = SS; 160 if (SS && NNS) { 161 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 162 NewSSPtr = &NewSS; 163 } 164 if (Correction && (NNS || NewII != &II) && 165 // Ignore a correction to a template type as the to-be-corrected 166 // identifier is not a template (typo correction for template names 167 // is handled elsewhere). 168 !(getLangOptions().CPlusPlus && NewSSPtr && 169 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 170 false, Template, MemberOfUnknownSpecialization))) { 171 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 172 isClassName, HasTrailingDot, ObjectTypePtr, 173 WantNontrivialTypeSourceInfo); 174 if (Ty) { 175 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 176 std::string CorrectedQuotedStr( 177 Correction.getQuoted(getLangOptions())); 178 Diag(NameLoc, diag::err_unknown_typename_suggest) 179 << Result.getLookupName() << CorrectedQuotedStr 180 << FixItHint::CreateReplacement(SourceRange(NameLoc), 181 CorrectedStr); 182 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 183 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 184 << CorrectedQuotedStr; 185 186 if (SS && NNS) 187 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 *CorrectedII = NewII; 189 return Ty; 190 } 191 } 192 } 193 // If typo correction failed or was not performed, fall through 194 case LookupResult::FoundOverloaded: 195 case LookupResult::FoundUnresolvedValue: 196 Result.suppressDiagnostics(); 197 return ParsedType(); 198 199 case LookupResult::Ambiguous: 200 // Recover from type-hiding ambiguities by hiding the type. We'll 201 // do the lookup again when looking for an object, and we can 202 // diagnose the error then. If we don't do this, then the error 203 // about hiding the type will be immediately followed by an error 204 // that only makes sense if the identifier was treated like a type. 205 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 206 Result.suppressDiagnostics(); 207 return ParsedType(); 208 } 209 210 // Look to see if we have a type anywhere in the list of results. 211 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 212 Res != ResEnd; ++Res) { 213 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 214 if (!IIDecl || 215 (*Res)->getLocation().getRawEncoding() < 216 IIDecl->getLocation().getRawEncoding()) 217 IIDecl = *Res; 218 } 219 } 220 221 if (!IIDecl) { 222 // None of the entities we found is a type, so there is no way 223 // to even assume that the result is a type. In this case, don't 224 // complain about the ambiguity. The parser will either try to 225 // perform this lookup again (e.g., as an object name), which 226 // will produce the ambiguity, or will complain that it expected 227 // a type name. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 232 // We found a type within the ambiguous lookup; diagnose the 233 // ambiguity and then return that type. This might be the right 234 // answer, or it might not be, but it suppresses any attempt to 235 // perform the name lookup again. 236 break; 237 238 case LookupResult::Found: 239 IIDecl = Result.getFoundDecl(); 240 break; 241 } 242 243 assert(IIDecl && "Didn't find decl"); 244 245 QualType T; 246 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 247 DiagnoseUseOfDecl(IIDecl, NameLoc); 248 249 if (T.isNull()) 250 T = Context.getTypeDeclType(TD); 251 252 if (SS && SS->isNotEmpty()) { 253 if (WantNontrivialTypeSourceInfo) { 254 // Construct a type with type-source information. 255 TypeLocBuilder Builder; 256 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 257 258 T = getElaboratedType(ETK_None, *SS, T); 259 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 260 ElabTL.setKeywordLoc(SourceLocation()); 261 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 262 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 263 } else { 264 T = getElaboratedType(ETK_None, *SS, T); 265 } 266 } 267 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 268 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 269 if (!HasTrailingDot) 270 T = Context.getObjCInterfaceType(IDecl); 271 } 272 273 if (T.isNull()) { 274 // If it's not plausibly a type, suppress diagnostics. 275 Result.suppressDiagnostics(); 276 return ParsedType(); 277 } 278 return ParsedType::make(T); 279} 280 281/// isTagName() - This method is called *for error recovery purposes only* 282/// to determine if the specified name is a valid tag name ("struct foo"). If 283/// so, this returns the TST for the tag corresponding to it (TST_enum, 284/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 285/// where the user forgot to specify the tag. 286DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 287 // Do a tag name lookup in this scope. 288 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 289 LookupName(R, S, false); 290 R.suppressDiagnostics(); 291 if (R.getResultKind() == LookupResult::Found) 292 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 293 switch (TD->getTagKind()) { 294 default: return DeclSpec::TST_unspecified; 295 case TTK_Struct: return DeclSpec::TST_struct; 296 case TTK_Union: return DeclSpec::TST_union; 297 case TTK_Class: return DeclSpec::TST_class; 298 case TTK_Enum: return DeclSpec::TST_enum; 299 } 300 } 301 302 return DeclSpec::TST_unspecified; 303} 304 305/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 306/// if a CXXScopeSpec's type is equal to the type of one of the base classes 307/// then downgrade the missing typename error to a warning. 308/// This is needed for MSVC compatibility; Example: 309/// @code 310/// template<class T> class A { 311/// public: 312/// typedef int TYPE; 313/// }; 314/// template<class T> class B : public A<T> { 315/// public: 316/// A<T>::TYPE a; // no typename required because A<T> is a base class. 317/// }; 318/// @endcode 319bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 320 if (CurContext->isRecord()) { 321 const Type *Ty = SS->getScopeRep()->getAsType(); 322 323 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 324 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 325 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 326 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 327 return true; 328 return S->isFunctionPrototypeScope(); 329 } 330 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 331} 332 333bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 334 SourceLocation IILoc, 335 Scope *S, 336 CXXScopeSpec *SS, 337 ParsedType &SuggestedType) { 338 // We don't have anything to suggest (yet). 339 SuggestedType = ParsedType(); 340 341 // There may have been a typo in the name of the type. Look up typo 342 // results, in case we have something that we can suggest. 343 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 344 LookupOrdinaryName, S, SS, NULL, 345 false, CTC_Type)) { 346 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 347 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 348 349 if (Corrected.isKeyword()) { 350 // We corrected to a keyword. 351 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 352 Diag(IILoc, diag::err_unknown_typename_suggest) 353 << &II << CorrectedQuotedStr; 354 return true; 355 } else { 356 NamedDecl *Result = Corrected.getCorrectionDecl(); 357 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 358 !Result->isInvalidDecl()) { 359 // We found a similarly-named type or interface; suggest that. 360 if (!SS || !SS->isSet()) 361 Diag(IILoc, diag::err_unknown_typename_suggest) 362 << &II << CorrectedQuotedStr 363 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 364 else if (DeclContext *DC = computeDeclContext(*SS, false)) 365 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 366 << &II << DC << CorrectedQuotedStr << SS->getRange() 367 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 368 else 369 llvm_unreachable("could not have corrected a typo here"); 370 371 Diag(Result->getLocation(), diag::note_previous_decl) 372 << CorrectedQuotedStr; 373 374 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 375 false, false, ParsedType(), 376 /*NonTrivialTypeSourceInfo=*/true); 377 return true; 378 } 379 } 380 } 381 382 if (getLangOptions().CPlusPlus) { 383 // See if II is a class template that the user forgot to pass arguments to. 384 UnqualifiedId Name; 385 Name.setIdentifier(&II, IILoc); 386 CXXScopeSpec EmptySS; 387 TemplateTy TemplateResult; 388 bool MemberOfUnknownSpecialization; 389 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 390 Name, ParsedType(), true, TemplateResult, 391 MemberOfUnknownSpecialization) == TNK_Type_template) { 392 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 393 Diag(IILoc, diag::err_template_missing_args) << TplName; 394 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 395 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 396 << TplDecl->getTemplateParameters()->getSourceRange(); 397 } 398 return true; 399 } 400 } 401 402 // FIXME: Should we move the logic that tries to recover from a missing tag 403 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 404 405 if (!SS || (!SS->isSet() && !SS->isInvalid())) 406 Diag(IILoc, diag::err_unknown_typename) << &II; 407 else if (DeclContext *DC = computeDeclContext(*SS, false)) 408 Diag(IILoc, diag::err_typename_nested_not_found) 409 << &II << DC << SS->getRange(); 410 else if (isDependentScopeSpecifier(*SS)) { 411 unsigned DiagID = diag::err_typename_missing; 412 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 413 DiagID = diag::warn_typename_missing; 414 415 Diag(SS->getRange().getBegin(), DiagID) 416 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 417 << SourceRange(SS->getRange().getBegin(), IILoc) 418 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 419 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 420 .get(); 421 } else { 422 assert(SS && SS->isInvalid() && 423 "Invalid scope specifier has already been diagnosed"); 424 } 425 426 return true; 427} 428 429/// \brief Determine whether the given result set contains either a type name 430/// or 431static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 433 NextToken.is(tok::less); 434 435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 437 return true; 438 439 if (CheckTemplate && isa<TemplateDecl>(*I)) 440 return true; 441 } 442 443 return false; 444} 445 446Sema::NameClassification Sema::ClassifyName(Scope *S, 447 CXXScopeSpec &SS, 448 IdentifierInfo *&Name, 449 SourceLocation NameLoc, 450 const Token &NextToken) { 451 DeclarationNameInfo NameInfo(Name, NameLoc); 452 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 453 454 if (NextToken.is(tok::coloncolon)) { 455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 456 QualType(), false, SS, 0, false); 457 458 } 459 460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 461 LookupParsedName(Result, S, &SS, !CurMethod); 462 463 // Perform lookup for Objective-C instance variables (including automatically 464 // synthesized instance variables), if we're in an Objective-C method. 465 // FIXME: This lookup really, really needs to be folded in to the normal 466 // unqualified lookup mechanism. 467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 468 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 469 if (E.get() || E.isInvalid()) 470 return E; 471 } 472 473 bool SecondTry = false; 474 bool IsFilteredTemplateName = false; 475 476Corrected: 477 switch (Result.getResultKind()) { 478 case LookupResult::NotFound: 479 // If an unqualified-id is followed by a '(', then we have a function 480 // call. 481 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 482 // In C++, this is an ADL-only call. 483 // FIXME: Reference? 484 if (getLangOptions().CPlusPlus) 485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 486 487 // C90 6.3.2.2: 488 // If the expression that precedes the parenthesized argument list in a 489 // function call consists solely of an identifier, and if no 490 // declaration is visible for this identifier, the identifier is 491 // implicitly declared exactly as if, in the innermost block containing 492 // the function call, the declaration 493 // 494 // extern int identifier (); 495 // 496 // appeared. 497 // 498 // We also allow this in C99 as an extension. 499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 500 Result.addDecl(D); 501 Result.resolveKind(); 502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 503 } 504 } 505 506 // In C, we first see whether there is a tag type by the same name, in 507 // which case it's likely that the user just forget to write "enum", 508 // "struct", or "union". 509 if (!getLangOptions().CPlusPlus && !SecondTry) { 510 Result.clear(LookupTagName); 511 LookupParsedName(Result, S, &SS); 512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 513 const char *TagName = 0; 514 const char *FixItTagName = 0; 515 switch (Tag->getTagKind()) { 516 case TTK_Class: 517 TagName = "class"; 518 FixItTagName = "class "; 519 break; 520 521 case TTK_Enum: 522 TagName = "enum"; 523 FixItTagName = "enum "; 524 break; 525 526 case TTK_Struct: 527 TagName = "struct"; 528 FixItTagName = "struct "; 529 break; 530 531 case TTK_Union: 532 TagName = "union"; 533 FixItTagName = "union "; 534 break; 535 } 536 537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 538 << Name << TagName << getLangOptions().CPlusPlus 539 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 540 break; 541 } 542 543 Result.clear(LookupOrdinaryName); 544 } 545 546 // Perform typo correction to determine if there is another name that is 547 // close to this name. 548 if (!SecondTry) { 549 SecondTry = true; 550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 551 Result.getLookupKind(), S, 552 &SS)) { 553 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 554 unsigned QualifiedDiag = diag::err_no_member_suggest; 555 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 556 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 557 558 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 559 NamedDecl *UnderlyingFirstDecl 560 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 561 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 562 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 563 UnqualifiedDiag = diag::err_no_template_suggest; 564 QualifiedDiag = diag::err_no_member_template_suggest; 565 } else if (UnderlyingFirstDecl && 566 (isa<TypeDecl>(UnderlyingFirstDecl) || 567 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 568 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 569 UnqualifiedDiag = diag::err_unknown_typename_suggest; 570 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 571 } 572 573 if (SS.isEmpty()) 574 Diag(NameLoc, UnqualifiedDiag) 575 << Name << CorrectedQuotedStr 576 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 577 else 578 Diag(NameLoc, QualifiedDiag) 579 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 580 << SS.getRange() 581 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 582 583 // Update the name, so that the caller has the new name. 584 Name = Corrected.getCorrectionAsIdentifierInfo(); 585 586 // Also update the LookupResult... 587 // FIXME: This should probably go away at some point 588 Result.clear(); 589 Result.setLookupName(Corrected.getCorrection()); 590 if (FirstDecl) Result.addDecl(FirstDecl); 591 592 // Typo correction corrected to a keyword. 593 if (Corrected.isKeyword()) 594 return Corrected.getCorrectionAsIdentifierInfo(); 595 596 if (FirstDecl) 597 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 598 << CorrectedQuotedStr; 599 600 // If we found an Objective-C instance variable, let 601 // LookupInObjCMethod build the appropriate expression to 602 // reference the ivar. 603 // FIXME: This is a gross hack. 604 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 605 Result.clear(); 606 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 607 return move(E); 608 } 609 610 goto Corrected; 611 } 612 } 613 614 // We failed to correct; just fall through and let the parser deal with it. 615 Result.suppressDiagnostics(); 616 return NameClassification::Unknown(); 617 618 case LookupResult::NotFoundInCurrentInstantiation: 619 // We performed name lookup into the current instantiation, and there were 620 // dependent bases, so we treat this result the same way as any other 621 // dependent nested-name-specifier. 622 623 // C++ [temp.res]p2: 624 // A name used in a template declaration or definition and that is 625 // dependent on a template-parameter is assumed not to name a type 626 // unless the applicable name lookup finds a type name or the name is 627 // qualified by the keyword typename. 628 // 629 // FIXME: If the next token is '<', we might want to ask the parser to 630 // perform some heroics to see if we actually have a 631 // template-argument-list, which would indicate a missing 'template' 632 // keyword here. 633 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 634 635 case LookupResult::Found: 636 case LookupResult::FoundOverloaded: 637 case LookupResult::FoundUnresolvedValue: 638 break; 639 640 case LookupResult::Ambiguous: 641 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 642 hasAnyAcceptableTemplateNames(Result)) { 643 // C++ [temp.local]p3: 644 // A lookup that finds an injected-class-name (10.2) can result in an 645 // ambiguity in certain cases (for example, if it is found in more than 646 // one base class). If all of the injected-class-names that are found 647 // refer to specializations of the same class template, and if the name 648 // is followed by a template-argument-list, the reference refers to the 649 // class template itself and not a specialization thereof, and is not 650 // ambiguous. 651 // 652 // This filtering can make an ambiguous result into an unambiguous one, 653 // so try again after filtering out template names. 654 FilterAcceptableTemplateNames(Result); 655 if (!Result.isAmbiguous()) { 656 IsFilteredTemplateName = true; 657 break; 658 } 659 } 660 661 // Diagnose the ambiguity and return an error. 662 return NameClassification::Error(); 663 } 664 665 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 666 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 667 // C++ [temp.names]p3: 668 // After name lookup (3.4) finds that a name is a template-name or that 669 // an operator-function-id or a literal- operator-id refers to a set of 670 // overloaded functions any member of which is a function template if 671 // this is followed by a <, the < is always taken as the delimiter of a 672 // template-argument-list and never as the less-than operator. 673 if (!IsFilteredTemplateName) 674 FilterAcceptableTemplateNames(Result); 675 676 if (!Result.empty()) { 677 bool IsFunctionTemplate; 678 TemplateName Template; 679 if (Result.end() - Result.begin() > 1) { 680 IsFunctionTemplate = true; 681 Template = Context.getOverloadedTemplateName(Result.begin(), 682 Result.end()); 683 } else { 684 TemplateDecl *TD 685 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 686 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 687 688 if (SS.isSet() && !SS.isInvalid()) 689 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 690 /*TemplateKeyword=*/false, 691 TD); 692 else 693 Template = TemplateName(TD); 694 } 695 696 if (IsFunctionTemplate) { 697 // Function templates always go through overload resolution, at which 698 // point we'll perform the various checks (e.g., accessibility) we need 699 // to based on which function we selected. 700 Result.suppressDiagnostics(); 701 702 return NameClassification::FunctionTemplate(Template); 703 } 704 705 return NameClassification::TypeTemplate(Template); 706 } 707 } 708 709 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 710 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 711 DiagnoseUseOfDecl(Type, NameLoc); 712 QualType T = Context.getTypeDeclType(Type); 713 return ParsedType::make(T); 714 } 715 716 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 717 if (!Class) { 718 // FIXME: It's unfortunate that we don't have a Type node for handling this. 719 if (ObjCCompatibleAliasDecl *Alias 720 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 721 Class = Alias->getClassInterface(); 722 } 723 724 if (Class) { 725 DiagnoseUseOfDecl(Class, NameLoc); 726 727 if (NextToken.is(tok::period)) { 728 // Interface. <something> is parsed as a property reference expression. 729 // Just return "unknown" as a fall-through for now. 730 Result.suppressDiagnostics(); 731 return NameClassification::Unknown(); 732 } 733 734 QualType T = Context.getObjCInterfaceType(Class); 735 return ParsedType::make(T); 736 } 737 738 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 739 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 740 741 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 742 return BuildDeclarationNameExpr(SS, Result, ADL); 743} 744 745// Determines the context to return to after temporarily entering a 746// context. This depends in an unnecessarily complicated way on the 747// exact ordering of callbacks from the parser. 748DeclContext *Sema::getContainingDC(DeclContext *DC) { 749 750 // Functions defined inline within classes aren't parsed until we've 751 // finished parsing the top-level class, so the top-level class is 752 // the context we'll need to return to. 753 if (isa<FunctionDecl>(DC)) { 754 DC = DC->getLexicalParent(); 755 756 // A function not defined within a class will always return to its 757 // lexical context. 758 if (!isa<CXXRecordDecl>(DC)) 759 return DC; 760 761 // A C++ inline method/friend is parsed *after* the topmost class 762 // it was declared in is fully parsed ("complete"); the topmost 763 // class is the context we need to return to. 764 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 765 DC = RD; 766 767 // Return the declaration context of the topmost class the inline method is 768 // declared in. 769 return DC; 770 } 771 772 return DC->getLexicalParent(); 773} 774 775void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 776 assert(getContainingDC(DC) == CurContext && 777 "The next DeclContext should be lexically contained in the current one."); 778 CurContext = DC; 779 S->setEntity(DC); 780} 781 782void Sema::PopDeclContext() { 783 assert(CurContext && "DeclContext imbalance!"); 784 785 CurContext = getContainingDC(CurContext); 786 assert(CurContext && "Popped translation unit!"); 787} 788 789/// EnterDeclaratorContext - Used when we must lookup names in the context 790/// of a declarator's nested name specifier. 791/// 792void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 793 // C++0x [basic.lookup.unqual]p13: 794 // A name used in the definition of a static data member of class 795 // X (after the qualified-id of the static member) is looked up as 796 // if the name was used in a member function of X. 797 // C++0x [basic.lookup.unqual]p14: 798 // If a variable member of a namespace is defined outside of the 799 // scope of its namespace then any name used in the definition of 800 // the variable member (after the declarator-id) is looked up as 801 // if the definition of the variable member occurred in its 802 // namespace. 803 // Both of these imply that we should push a scope whose context 804 // is the semantic context of the declaration. We can't use 805 // PushDeclContext here because that context is not necessarily 806 // lexically contained in the current context. Fortunately, 807 // the containing scope should have the appropriate information. 808 809 assert(!S->getEntity() && "scope already has entity"); 810 811#ifndef NDEBUG 812 Scope *Ancestor = S->getParent(); 813 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 814 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 815#endif 816 817 CurContext = DC; 818 S->setEntity(DC); 819} 820 821void Sema::ExitDeclaratorContext(Scope *S) { 822 assert(S->getEntity() == CurContext && "Context imbalance!"); 823 824 // Switch back to the lexical context. The safety of this is 825 // enforced by an assert in EnterDeclaratorContext. 826 Scope *Ancestor = S->getParent(); 827 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 828 CurContext = (DeclContext*) Ancestor->getEntity(); 829 830 // We don't need to do anything with the scope, which is going to 831 // disappear. 832} 833 834 835void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 836 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 837 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 838 // We assume that the caller has already called 839 // ActOnReenterTemplateScope 840 FD = TFD->getTemplatedDecl(); 841 } 842 if (!FD) 843 return; 844 845 PushDeclContext(S, FD); 846 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 847 ParmVarDecl *Param = FD->getParamDecl(P); 848 // If the parameter has an identifier, then add it to the scope 849 if (Param->getIdentifier()) { 850 S->AddDecl(Param); 851 IdResolver.AddDecl(Param); 852 } 853 } 854} 855 856 857/// \brief Determine whether we allow overloading of the function 858/// PrevDecl with another declaration. 859/// 860/// This routine determines whether overloading is possible, not 861/// whether some new function is actually an overload. It will return 862/// true in C++ (where we can always provide overloads) or, as an 863/// extension, in C when the previous function is already an 864/// overloaded function declaration or has the "overloadable" 865/// attribute. 866static bool AllowOverloadingOfFunction(LookupResult &Previous, 867 ASTContext &Context) { 868 if (Context.getLangOptions().CPlusPlus) 869 return true; 870 871 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 872 return true; 873 874 return (Previous.getResultKind() == LookupResult::Found 875 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 876} 877 878/// Add this decl to the scope shadowed decl chains. 879void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 880 // Move up the scope chain until we find the nearest enclosing 881 // non-transparent context. The declaration will be introduced into this 882 // scope. 883 while (S->getEntity() && 884 ((DeclContext *)S->getEntity())->isTransparentContext()) 885 S = S->getParent(); 886 887 // Add scoped declarations into their context, so that they can be 888 // found later. Declarations without a context won't be inserted 889 // into any context. 890 if (AddToContext) 891 CurContext->addDecl(D); 892 893 // Out-of-line definitions shouldn't be pushed into scope in C++. 894 // Out-of-line variable and function definitions shouldn't even in C. 895 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 896 D->isOutOfLine() && 897 !D->getDeclContext()->getRedeclContext()->Equals( 898 D->getLexicalDeclContext()->getRedeclContext())) 899 return; 900 901 // Template instantiations should also not be pushed into scope. 902 if (isa<FunctionDecl>(D) && 903 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 904 return; 905 906 // If this replaces anything in the current scope, 907 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 908 IEnd = IdResolver.end(); 909 for (; I != IEnd; ++I) { 910 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 911 S->RemoveDecl(*I); 912 IdResolver.RemoveDecl(*I); 913 914 // Should only need to replace one decl. 915 break; 916 } 917 } 918 919 S->AddDecl(D); 920 921 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 922 // Implicitly-generated labels may end up getting generated in an order that 923 // isn't strictly lexical, which breaks name lookup. Be careful to insert 924 // the label at the appropriate place in the identifier chain. 925 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 926 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 927 if (IDC == CurContext) { 928 if (!S->isDeclScope(*I)) 929 continue; 930 } else if (IDC->Encloses(CurContext)) 931 break; 932 } 933 934 IdResolver.InsertDeclAfter(I, D); 935 } else { 936 IdResolver.AddDecl(D); 937 } 938} 939 940void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 941 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 942 TUScope->AddDecl(D); 943} 944 945bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 946 bool ExplicitInstantiationOrSpecialization) { 947 return IdResolver.isDeclInScope(D, Ctx, Context, S, 948 ExplicitInstantiationOrSpecialization); 949} 950 951Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 952 DeclContext *TargetDC = DC->getPrimaryContext(); 953 do { 954 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 955 if (ScopeDC->getPrimaryContext() == TargetDC) 956 return S; 957 } while ((S = S->getParent())); 958 959 return 0; 960} 961 962static bool isOutOfScopePreviousDeclaration(NamedDecl *, 963 DeclContext*, 964 ASTContext&); 965 966/// Filters out lookup results that don't fall within the given scope 967/// as determined by isDeclInScope. 968void Sema::FilterLookupForScope(LookupResult &R, 969 DeclContext *Ctx, Scope *S, 970 bool ConsiderLinkage, 971 bool ExplicitInstantiationOrSpecialization) { 972 LookupResult::Filter F = R.makeFilter(); 973 while (F.hasNext()) { 974 NamedDecl *D = F.next(); 975 976 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 977 continue; 978 979 if (ConsiderLinkage && 980 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 981 continue; 982 983 F.erase(); 984 } 985 986 F.done(); 987} 988 989static bool isUsingDecl(NamedDecl *D) { 990 return isa<UsingShadowDecl>(D) || 991 isa<UnresolvedUsingTypenameDecl>(D) || 992 isa<UnresolvedUsingValueDecl>(D); 993} 994 995/// Removes using shadow declarations from the lookup results. 996static void RemoveUsingDecls(LookupResult &R) { 997 LookupResult::Filter F = R.makeFilter(); 998 while (F.hasNext()) 999 if (isUsingDecl(F.next())) 1000 F.erase(); 1001 1002 F.done(); 1003} 1004 1005/// \brief Check for this common pattern: 1006/// @code 1007/// class S { 1008/// S(const S&); // DO NOT IMPLEMENT 1009/// void operator=(const S&); // DO NOT IMPLEMENT 1010/// }; 1011/// @endcode 1012static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1013 // FIXME: Should check for private access too but access is set after we get 1014 // the decl here. 1015 if (D->doesThisDeclarationHaveABody()) 1016 return false; 1017 1018 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1019 return CD->isCopyConstructor(); 1020 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1021 return Method->isCopyAssignmentOperator(); 1022 return false; 1023} 1024 1025bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1026 assert(D); 1027 1028 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1029 return false; 1030 1031 // Ignore class templates. 1032 if (D->getDeclContext()->isDependentContext() || 1033 D->getLexicalDeclContext()->isDependentContext()) 1034 return false; 1035 1036 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1037 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1038 return false; 1039 1040 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1041 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1042 return false; 1043 } else { 1044 // 'static inline' functions are used in headers; don't warn. 1045 if (FD->getStorageClass() == SC_Static && 1046 FD->isInlineSpecified()) 1047 return false; 1048 } 1049 1050 if (FD->doesThisDeclarationHaveABody() && 1051 Context.DeclMustBeEmitted(FD)) 1052 return false; 1053 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1054 if (!VD->isFileVarDecl() || 1055 VD->getType().isConstant(Context) || 1056 Context.DeclMustBeEmitted(VD)) 1057 return false; 1058 1059 if (VD->isStaticDataMember() && 1060 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1061 return false; 1062 1063 } else { 1064 return false; 1065 } 1066 1067 // Only warn for unused decls internal to the translation unit. 1068 if (D->getLinkage() == ExternalLinkage) 1069 return false; 1070 1071 return true; 1072} 1073 1074void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1075 if (!D) 1076 return; 1077 1078 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1079 const FunctionDecl *First = FD->getFirstDeclaration(); 1080 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1085 const VarDecl *First = VD->getFirstDeclaration(); 1086 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1087 return; // First should already be in the vector. 1088 } 1089 1090 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1091 UnusedFileScopedDecls.push_back(D); 1092 } 1093 1094static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1095 if (D->isInvalidDecl()) 1096 return false; 1097 1098 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1099 return false; 1100 1101 if (isa<LabelDecl>(D)) 1102 return true; 1103 1104 // White-list anything that isn't a local variable. 1105 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1106 !D->getDeclContext()->isFunctionOrMethod()) 1107 return false; 1108 1109 // Types of valid local variables should be complete, so this should succeed. 1110 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1111 1112 // White-list anything with an __attribute__((unused)) type. 1113 QualType Ty = VD->getType(); 1114 1115 // Only look at the outermost level of typedef. 1116 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1117 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1118 return false; 1119 } 1120 1121 // If we failed to complete the type for some reason, or if the type is 1122 // dependent, don't diagnose the variable. 1123 if (Ty->isIncompleteType() || Ty->isDependentType()) 1124 return false; 1125 1126 if (const TagType *TT = Ty->getAs<TagType>()) { 1127 const TagDecl *Tag = TT->getDecl(); 1128 if (Tag->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1132 if (!RD->hasTrivialDestructor()) 1133 return false; 1134 1135 if (const Expr *Init = VD->getInit()) { 1136 const CXXConstructExpr *Construct = 1137 dyn_cast<CXXConstructExpr>(Init); 1138 if (Construct && !Construct->isElidable()) { 1139 CXXConstructorDecl *CD = Construct->getConstructor(); 1140 if (!CD->isTrivial()) 1141 return false; 1142 } 1143 } 1144 } 1145 } 1146 1147 // TODO: __attribute__((unused)) templates? 1148 } 1149 1150 return true; 1151} 1152 1153static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1154 FixItHint &Hint) { 1155 if (isa<LabelDecl>(D)) { 1156 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1157 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1158 if (AfterColon.isInvalid()) 1159 return; 1160 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1161 getCharRange(D->getLocStart(), AfterColon)); 1162 } 1163 return; 1164} 1165 1166/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1167/// unless they are marked attr(unused). 1168void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1169 FixItHint Hint; 1170 if (!ShouldDiagnoseUnusedDecl(D)) 1171 return; 1172 1173 GenerateFixForUnusedDecl(D, Context, Hint); 1174 1175 unsigned DiagID; 1176 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1177 DiagID = diag::warn_unused_exception_param; 1178 else if (isa<LabelDecl>(D)) 1179 DiagID = diag::warn_unused_label; 1180 else 1181 DiagID = diag::warn_unused_variable; 1182 1183 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1184} 1185 1186static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1187 // Verify that we have no forward references left. If so, there was a goto 1188 // or address of a label taken, but no definition of it. Label fwd 1189 // definitions are indicated with a null substmt. 1190 if (L->getStmt() == 0) 1191 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1192} 1193 1194void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1195 if (S->decl_empty()) return; 1196 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1197 "Scope shouldn't contain decls!"); 1198 1199 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1200 I != E; ++I) { 1201 Decl *TmpD = (*I); 1202 assert(TmpD && "This decl didn't get pushed??"); 1203 1204 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1205 NamedDecl *D = cast<NamedDecl>(TmpD); 1206 1207 if (!D->getDeclName()) continue; 1208 1209 // Diagnose unused variables in this scope. 1210 if (!S->hasErrorOccurred()) 1211 DiagnoseUnusedDecl(D); 1212 1213 // If this was a forward reference to a label, verify it was defined. 1214 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1215 CheckPoppedLabel(LD, *this); 1216 1217 // Remove this name from our lexical scope. 1218 IdResolver.RemoveDecl(D); 1219 } 1220} 1221 1222/// \brief Look for an Objective-C class in the translation unit. 1223/// 1224/// \param Id The name of the Objective-C class we're looking for. If 1225/// typo-correction fixes this name, the Id will be updated 1226/// to the fixed name. 1227/// 1228/// \param IdLoc The location of the name in the translation unit. 1229/// 1230/// \param TypoCorrection If true, this routine will attempt typo correction 1231/// if there is no class with the given name. 1232/// 1233/// \returns The declaration of the named Objective-C class, or NULL if the 1234/// class could not be found. 1235ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1236 SourceLocation IdLoc, 1237 bool DoTypoCorrection) { 1238 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1239 // creation from this context. 1240 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1241 1242 if (!IDecl && DoTypoCorrection) { 1243 // Perform typo correction at the given location, but only if we 1244 // find an Objective-C class name. 1245 TypoCorrection C; 1246 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1247 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1248 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1249 Diag(IdLoc, diag::err_undef_interface_suggest) 1250 << Id << IDecl->getDeclName() 1251 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1252 Diag(IDecl->getLocation(), diag::note_previous_decl) 1253 << IDecl->getDeclName(); 1254 1255 Id = IDecl->getIdentifier(); 1256 } 1257 } 1258 1259 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1260} 1261 1262/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1263/// from S, where a non-field would be declared. This routine copes 1264/// with the difference between C and C++ scoping rules in structs and 1265/// unions. For example, the following code is well-formed in C but 1266/// ill-formed in C++: 1267/// @code 1268/// struct S6 { 1269/// enum { BAR } e; 1270/// }; 1271/// 1272/// void test_S6() { 1273/// struct S6 a; 1274/// a.e = BAR; 1275/// } 1276/// @endcode 1277/// For the declaration of BAR, this routine will return a different 1278/// scope. The scope S will be the scope of the unnamed enumeration 1279/// within S6. In C++, this routine will return the scope associated 1280/// with S6, because the enumeration's scope is a transparent 1281/// context but structures can contain non-field names. In C, this 1282/// routine will return the translation unit scope, since the 1283/// enumeration's scope is a transparent context and structures cannot 1284/// contain non-field names. 1285Scope *Sema::getNonFieldDeclScope(Scope *S) { 1286 while (((S->getFlags() & Scope::DeclScope) == 0) || 1287 (S->getEntity() && 1288 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1289 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1290 S = S->getParent(); 1291 return S; 1292} 1293 1294/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1295/// file scope. lazily create a decl for it. ForRedeclaration is true 1296/// if we're creating this built-in in anticipation of redeclaring the 1297/// built-in. 1298NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1299 Scope *S, bool ForRedeclaration, 1300 SourceLocation Loc) { 1301 Builtin::ID BID = (Builtin::ID)bid; 1302 1303 ASTContext::GetBuiltinTypeError Error; 1304 QualType R = Context.GetBuiltinType(BID, Error); 1305 switch (Error) { 1306 case ASTContext::GE_None: 1307 // Okay 1308 break; 1309 1310 case ASTContext::GE_Missing_stdio: 1311 if (ForRedeclaration) 1312 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1313 << Context.BuiltinInfo.GetName(BID); 1314 return 0; 1315 1316 case ASTContext::GE_Missing_setjmp: 1317 if (ForRedeclaration) 1318 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1319 << Context.BuiltinInfo.GetName(BID); 1320 return 0; 1321 1322 case ASTContext::GE_Missing_ucontext: 1323 if (ForRedeclaration) 1324 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1325 << Context.BuiltinInfo.GetName(BID); 1326 return 0; 1327 } 1328 1329 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1330 Diag(Loc, diag::ext_implicit_lib_function_decl) 1331 << Context.BuiltinInfo.GetName(BID) 1332 << R; 1333 if (Context.BuiltinInfo.getHeaderName(BID) && 1334 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1335 != DiagnosticsEngine::Ignored) 1336 Diag(Loc, diag::note_please_include_header) 1337 << Context.BuiltinInfo.getHeaderName(BID) 1338 << Context.BuiltinInfo.GetName(BID); 1339 } 1340 1341 FunctionDecl *New = FunctionDecl::Create(Context, 1342 Context.getTranslationUnitDecl(), 1343 Loc, Loc, II, R, /*TInfo=*/0, 1344 SC_Extern, 1345 SC_None, false, 1346 /*hasPrototype=*/true); 1347 New->setImplicit(); 1348 1349 // Create Decl objects for each parameter, adding them to the 1350 // FunctionDecl. 1351 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1352 SmallVector<ParmVarDecl*, 16> Params; 1353 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1354 ParmVarDecl *parm = 1355 ParmVarDecl::Create(Context, New, SourceLocation(), 1356 SourceLocation(), 0, 1357 FT->getArgType(i), /*TInfo=*/0, 1358 SC_None, SC_None, 0); 1359 parm->setScopeInfo(0, i); 1360 Params.push_back(parm); 1361 } 1362 New->setParams(Params); 1363 } 1364 1365 AddKnownFunctionAttributes(New); 1366 1367 // TUScope is the translation-unit scope to insert this function into. 1368 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1369 // relate Scopes to DeclContexts, and probably eliminate CurContext 1370 // entirely, but we're not there yet. 1371 DeclContext *SavedContext = CurContext; 1372 CurContext = Context.getTranslationUnitDecl(); 1373 PushOnScopeChains(New, TUScope); 1374 CurContext = SavedContext; 1375 return New; 1376} 1377 1378bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1379 QualType OldType; 1380 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1381 OldType = OldTypedef->getUnderlyingType(); 1382 else 1383 OldType = Context.getTypeDeclType(Old); 1384 QualType NewType = New->getUnderlyingType(); 1385 1386 if (OldType != NewType && 1387 !OldType->isDependentType() && 1388 !NewType->isDependentType() && 1389 !Context.hasSameType(OldType, NewType)) { 1390 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1391 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1392 << Kind << NewType << OldType; 1393 if (Old->getLocation().isValid()) 1394 Diag(Old->getLocation(), diag::note_previous_definition); 1395 New->setInvalidDecl(); 1396 return true; 1397 } 1398 return false; 1399} 1400 1401/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1402/// same name and scope as a previous declaration 'Old'. Figure out 1403/// how to resolve this situation, merging decls or emitting 1404/// diagnostics as appropriate. If there was an error, set New to be invalid. 1405/// 1406void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1407 // If the new decl is known invalid already, don't bother doing any 1408 // merging checks. 1409 if (New->isInvalidDecl()) return; 1410 1411 // Allow multiple definitions for ObjC built-in typedefs. 1412 // FIXME: Verify the underlying types are equivalent! 1413 if (getLangOptions().ObjC1) { 1414 const IdentifierInfo *TypeID = New->getIdentifier(); 1415 switch (TypeID->getLength()) { 1416 default: break; 1417 case 2: 1418 if (!TypeID->isStr("id")) 1419 break; 1420 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1421 // Install the built-in type for 'id', ignoring the current definition. 1422 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1423 return; 1424 case 5: 1425 if (!TypeID->isStr("Class")) 1426 break; 1427 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1428 // Install the built-in type for 'Class', ignoring the current definition. 1429 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1430 return; 1431 case 3: 1432 if (!TypeID->isStr("SEL")) 1433 break; 1434 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1435 // Install the built-in type for 'SEL', ignoring the current definition. 1436 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1437 return; 1438 } 1439 // Fall through - the typedef name was not a builtin type. 1440 } 1441 1442 // Verify the old decl was also a type. 1443 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1444 if (!Old) { 1445 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1446 << New->getDeclName(); 1447 1448 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1449 if (OldD->getLocation().isValid()) 1450 Diag(OldD->getLocation(), diag::note_previous_definition); 1451 1452 return New->setInvalidDecl(); 1453 } 1454 1455 // If the old declaration is invalid, just give up here. 1456 if (Old->isInvalidDecl()) 1457 return New->setInvalidDecl(); 1458 1459 // If the typedef types are not identical, reject them in all languages and 1460 // with any extensions enabled. 1461 if (isIncompatibleTypedef(Old, New)) 1462 return; 1463 1464 // The types match. Link up the redeclaration chain if the old 1465 // declaration was a typedef. 1466 // FIXME: this is a potential source of weirdness if the type 1467 // spellings don't match exactly. 1468 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1469 New->setPreviousDeclaration(Typedef); 1470 1471 if (getLangOptions().MicrosoftExt) 1472 return; 1473 1474 if (getLangOptions().CPlusPlus) { 1475 // C++ [dcl.typedef]p2: 1476 // In a given non-class scope, a typedef specifier can be used to 1477 // redefine the name of any type declared in that scope to refer 1478 // to the type to which it already refers. 1479 if (!isa<CXXRecordDecl>(CurContext)) 1480 return; 1481 1482 // C++0x [dcl.typedef]p4: 1483 // In a given class scope, a typedef specifier can be used to redefine 1484 // any class-name declared in that scope that is not also a typedef-name 1485 // to refer to the type to which it already refers. 1486 // 1487 // This wording came in via DR424, which was a correction to the 1488 // wording in DR56, which accidentally banned code like: 1489 // 1490 // struct S { 1491 // typedef struct A { } A; 1492 // }; 1493 // 1494 // in the C++03 standard. We implement the C++0x semantics, which 1495 // allow the above but disallow 1496 // 1497 // struct S { 1498 // typedef int I; 1499 // typedef int I; 1500 // }; 1501 // 1502 // since that was the intent of DR56. 1503 if (!isa<TypedefNameDecl>(Old)) 1504 return; 1505 1506 Diag(New->getLocation(), diag::err_redefinition) 1507 << New->getDeclName(); 1508 Diag(Old->getLocation(), diag::note_previous_definition); 1509 return New->setInvalidDecl(); 1510 } 1511 1512 // If we have a redefinition of a typedef in C, emit a warning. This warning 1513 // is normally mapped to an error, but can be controlled with 1514 // -Wtypedef-redefinition. If either the original or the redefinition is 1515 // in a system header, don't emit this for compatibility with GCC. 1516 if (getDiagnostics().getSuppressSystemWarnings() && 1517 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1518 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1519 return; 1520 1521 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1522 << New->getDeclName(); 1523 Diag(Old->getLocation(), diag::note_previous_definition); 1524 return; 1525} 1526 1527/// DeclhasAttr - returns true if decl Declaration already has the target 1528/// attribute. 1529static bool 1530DeclHasAttr(const Decl *D, const Attr *A) { 1531 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1532 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1533 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1534 if ((*i)->getKind() == A->getKind()) { 1535 if (Ann) { 1536 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1537 return true; 1538 continue; 1539 } 1540 // FIXME: Don't hardcode this check 1541 if (OA && isa<OwnershipAttr>(*i)) 1542 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1543 return true; 1544 } 1545 1546 return false; 1547} 1548 1549/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1550void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1551 bool MergeDeprecation) { 1552 if (!Old->hasAttrs()) 1553 return; 1554 1555 bool foundAny = New->hasAttrs(); 1556 1557 // Ensure that any moving of objects within the allocated map is done before 1558 // we process them. 1559 if (!foundAny) New->setAttrs(AttrVec()); 1560 1561 for (specific_attr_iterator<InheritableAttr> 1562 i = Old->specific_attr_begin<InheritableAttr>(), 1563 e = Old->specific_attr_end<InheritableAttr>(); 1564 i != e; ++i) { 1565 // Ignore deprecated/unavailable/availability attributes if requested. 1566 if (!MergeDeprecation && 1567 (isa<DeprecatedAttr>(*i) || 1568 isa<UnavailableAttr>(*i) || 1569 isa<AvailabilityAttr>(*i))) 1570 continue; 1571 1572 if (!DeclHasAttr(New, *i)) { 1573 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1574 newAttr->setInherited(true); 1575 New->addAttr(newAttr); 1576 foundAny = true; 1577 } 1578 } 1579 1580 if (!foundAny) New->dropAttrs(); 1581} 1582 1583/// mergeParamDeclAttributes - Copy attributes from the old parameter 1584/// to the new one. 1585static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1586 const ParmVarDecl *oldDecl, 1587 ASTContext &C) { 1588 if (!oldDecl->hasAttrs()) 1589 return; 1590 1591 bool foundAny = newDecl->hasAttrs(); 1592 1593 // Ensure that any moving of objects within the allocated map is 1594 // done before we process them. 1595 if (!foundAny) newDecl->setAttrs(AttrVec()); 1596 1597 for (specific_attr_iterator<InheritableParamAttr> 1598 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1599 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1600 if (!DeclHasAttr(newDecl, *i)) { 1601 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1602 newAttr->setInherited(true); 1603 newDecl->addAttr(newAttr); 1604 foundAny = true; 1605 } 1606 } 1607 1608 if (!foundAny) newDecl->dropAttrs(); 1609} 1610 1611namespace { 1612 1613/// Used in MergeFunctionDecl to keep track of function parameters in 1614/// C. 1615struct GNUCompatibleParamWarning { 1616 ParmVarDecl *OldParm; 1617 ParmVarDecl *NewParm; 1618 QualType PromotedType; 1619}; 1620 1621} 1622 1623/// getSpecialMember - get the special member enum for a method. 1624Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1625 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1626 if (Ctor->isDefaultConstructor()) 1627 return Sema::CXXDefaultConstructor; 1628 1629 if (Ctor->isCopyConstructor()) 1630 return Sema::CXXCopyConstructor; 1631 1632 if (Ctor->isMoveConstructor()) 1633 return Sema::CXXMoveConstructor; 1634 } else if (isa<CXXDestructorDecl>(MD)) { 1635 return Sema::CXXDestructor; 1636 } else if (MD->isCopyAssignmentOperator()) { 1637 return Sema::CXXCopyAssignment; 1638 } else if (MD->isMoveAssignmentOperator()) { 1639 return Sema::CXXMoveAssignment; 1640 } 1641 1642 return Sema::CXXInvalid; 1643} 1644 1645/// canRedefineFunction - checks if a function can be redefined. Currently, 1646/// only extern inline functions can be redefined, and even then only in 1647/// GNU89 mode. 1648static bool canRedefineFunction(const FunctionDecl *FD, 1649 const LangOptions& LangOpts) { 1650 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1651 !LangOpts.CPlusPlus && 1652 FD->isInlineSpecified() && 1653 FD->getStorageClass() == SC_Extern); 1654} 1655 1656/// MergeFunctionDecl - We just parsed a function 'New' from 1657/// declarator D which has the same name and scope as a previous 1658/// declaration 'Old'. Figure out how to resolve this situation, 1659/// merging decls or emitting diagnostics as appropriate. 1660/// 1661/// In C++, New and Old must be declarations that are not 1662/// overloaded. Use IsOverload to determine whether New and Old are 1663/// overloaded, and to select the Old declaration that New should be 1664/// merged with. 1665/// 1666/// Returns true if there was an error, false otherwise. 1667bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1668 // Verify the old decl was also a function. 1669 FunctionDecl *Old = 0; 1670 if (FunctionTemplateDecl *OldFunctionTemplate 1671 = dyn_cast<FunctionTemplateDecl>(OldD)) 1672 Old = OldFunctionTemplate->getTemplatedDecl(); 1673 else 1674 Old = dyn_cast<FunctionDecl>(OldD); 1675 if (!Old) { 1676 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1677 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1678 Diag(Shadow->getTargetDecl()->getLocation(), 1679 diag::note_using_decl_target); 1680 Diag(Shadow->getUsingDecl()->getLocation(), 1681 diag::note_using_decl) << 0; 1682 return true; 1683 } 1684 1685 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1686 << New->getDeclName(); 1687 Diag(OldD->getLocation(), diag::note_previous_definition); 1688 return true; 1689 } 1690 1691 // Determine whether the previous declaration was a definition, 1692 // implicit declaration, or a declaration. 1693 diag::kind PrevDiag; 1694 if (Old->isThisDeclarationADefinition()) 1695 PrevDiag = diag::note_previous_definition; 1696 else if (Old->isImplicit()) 1697 PrevDiag = diag::note_previous_implicit_declaration; 1698 else 1699 PrevDiag = diag::note_previous_declaration; 1700 1701 QualType OldQType = Context.getCanonicalType(Old->getType()); 1702 QualType NewQType = Context.getCanonicalType(New->getType()); 1703 1704 // Don't complain about this if we're in GNU89 mode and the old function 1705 // is an extern inline function. 1706 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1707 New->getStorageClass() == SC_Static && 1708 Old->getStorageClass() != SC_Static && 1709 !canRedefineFunction(Old, getLangOptions())) { 1710 if (getLangOptions().MicrosoftExt) { 1711 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1712 Diag(Old->getLocation(), PrevDiag); 1713 } else { 1714 Diag(New->getLocation(), diag::err_static_non_static) << New; 1715 Diag(Old->getLocation(), PrevDiag); 1716 return true; 1717 } 1718 } 1719 1720 // If a function is first declared with a calling convention, but is 1721 // later declared or defined without one, the second decl assumes the 1722 // calling convention of the first. 1723 // 1724 // For the new decl, we have to look at the NON-canonical type to tell the 1725 // difference between a function that really doesn't have a calling 1726 // convention and one that is declared cdecl. That's because in 1727 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1728 // because it is the default calling convention. 1729 // 1730 // Note also that we DO NOT return at this point, because we still have 1731 // other tests to run. 1732 const FunctionType *OldType = cast<FunctionType>(OldQType); 1733 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1734 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1735 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1736 bool RequiresAdjustment = false; 1737 if (OldTypeInfo.getCC() != CC_Default && 1738 NewTypeInfo.getCC() == CC_Default) { 1739 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1740 RequiresAdjustment = true; 1741 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1742 NewTypeInfo.getCC())) { 1743 // Calling conventions really aren't compatible, so complain. 1744 Diag(New->getLocation(), diag::err_cconv_change) 1745 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1746 << (OldTypeInfo.getCC() == CC_Default) 1747 << (OldTypeInfo.getCC() == CC_Default ? "" : 1748 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1749 Diag(Old->getLocation(), diag::note_previous_declaration); 1750 return true; 1751 } 1752 1753 // FIXME: diagnose the other way around? 1754 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1755 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1756 RequiresAdjustment = true; 1757 } 1758 1759 // Merge regparm attribute. 1760 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1761 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1762 if (NewTypeInfo.getHasRegParm()) { 1763 Diag(New->getLocation(), diag::err_regparm_mismatch) 1764 << NewType->getRegParmType() 1765 << OldType->getRegParmType(); 1766 Diag(Old->getLocation(), diag::note_previous_declaration); 1767 return true; 1768 } 1769 1770 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1771 RequiresAdjustment = true; 1772 } 1773 1774 // Merge ns_returns_retained attribute. 1775 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1776 if (NewTypeInfo.getProducesResult()) { 1777 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1778 Diag(Old->getLocation(), diag::note_previous_declaration); 1779 return true; 1780 } 1781 1782 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1783 RequiresAdjustment = true; 1784 } 1785 1786 if (RequiresAdjustment) { 1787 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1788 New->setType(QualType(NewType, 0)); 1789 NewQType = Context.getCanonicalType(New->getType()); 1790 } 1791 1792 if (getLangOptions().CPlusPlus) { 1793 // (C++98 13.1p2): 1794 // Certain function declarations cannot be overloaded: 1795 // -- Function declarations that differ only in the return type 1796 // cannot be overloaded. 1797 QualType OldReturnType = OldType->getResultType(); 1798 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1799 QualType ResQT; 1800 if (OldReturnType != NewReturnType) { 1801 if (NewReturnType->isObjCObjectPointerType() 1802 && OldReturnType->isObjCObjectPointerType()) 1803 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1804 if (ResQT.isNull()) { 1805 if (New->isCXXClassMember() && New->isOutOfLine()) 1806 Diag(New->getLocation(), 1807 diag::err_member_def_does_not_match_ret_type) << New; 1808 else 1809 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1810 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1811 return true; 1812 } 1813 else 1814 NewQType = ResQT; 1815 } 1816 1817 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1818 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1819 if (OldMethod && NewMethod) { 1820 // Preserve triviality. 1821 NewMethod->setTrivial(OldMethod->isTrivial()); 1822 1823 // MSVC allows explicit template specialization at class scope: 1824 // 2 CXMethodDecls referring to the same function will be injected. 1825 // We don't want a redeclartion error. 1826 bool IsClassScopeExplicitSpecialization = 1827 OldMethod->isFunctionTemplateSpecialization() && 1828 NewMethod->isFunctionTemplateSpecialization(); 1829 bool isFriend = NewMethod->getFriendObjectKind(); 1830 1831 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1832 !IsClassScopeExplicitSpecialization) { 1833 // -- Member function declarations with the same name and the 1834 // same parameter types cannot be overloaded if any of them 1835 // is a static member function declaration. 1836 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1837 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1838 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1839 return true; 1840 } 1841 1842 // C++ [class.mem]p1: 1843 // [...] A member shall not be declared twice in the 1844 // member-specification, except that a nested class or member 1845 // class template can be declared and then later defined. 1846 unsigned NewDiag; 1847 if (isa<CXXConstructorDecl>(OldMethod)) 1848 NewDiag = diag::err_constructor_redeclared; 1849 else if (isa<CXXDestructorDecl>(NewMethod)) 1850 NewDiag = diag::err_destructor_redeclared; 1851 else if (isa<CXXConversionDecl>(NewMethod)) 1852 NewDiag = diag::err_conv_function_redeclared; 1853 else 1854 NewDiag = diag::err_member_redeclared; 1855 1856 Diag(New->getLocation(), NewDiag); 1857 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1858 1859 // Complain if this is an explicit declaration of a special 1860 // member that was initially declared implicitly. 1861 // 1862 // As an exception, it's okay to befriend such methods in order 1863 // to permit the implicit constructor/destructor/operator calls. 1864 } else if (OldMethod->isImplicit()) { 1865 if (isFriend) { 1866 NewMethod->setImplicit(); 1867 } else { 1868 Diag(NewMethod->getLocation(), 1869 diag::err_definition_of_implicitly_declared_member) 1870 << New << getSpecialMember(OldMethod); 1871 return true; 1872 } 1873 } else if (OldMethod->isExplicitlyDefaulted()) { 1874 Diag(NewMethod->getLocation(), 1875 diag::err_definition_of_explicitly_defaulted_member) 1876 << getSpecialMember(OldMethod); 1877 return true; 1878 } 1879 } 1880 1881 // (C++98 8.3.5p3): 1882 // All declarations for a function shall agree exactly in both the 1883 // return type and the parameter-type-list. 1884 // We also want to respect all the extended bits except noreturn. 1885 1886 // noreturn should now match unless the old type info didn't have it. 1887 QualType OldQTypeForComparison = OldQType; 1888 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1889 assert(OldQType == QualType(OldType, 0)); 1890 const FunctionType *OldTypeForComparison 1891 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1892 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1893 assert(OldQTypeForComparison.isCanonical()); 1894 } 1895 1896 if (OldQTypeForComparison == NewQType) 1897 return MergeCompatibleFunctionDecls(New, Old); 1898 1899 // Fall through for conflicting redeclarations and redefinitions. 1900 } 1901 1902 // C: Function types need to be compatible, not identical. This handles 1903 // duplicate function decls like "void f(int); void f(enum X);" properly. 1904 if (!getLangOptions().CPlusPlus && 1905 Context.typesAreCompatible(OldQType, NewQType)) { 1906 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1907 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1908 const FunctionProtoType *OldProto = 0; 1909 if (isa<FunctionNoProtoType>(NewFuncType) && 1910 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1911 // The old declaration provided a function prototype, but the 1912 // new declaration does not. Merge in the prototype. 1913 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1914 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1915 OldProto->arg_type_end()); 1916 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1917 ParamTypes.data(), ParamTypes.size(), 1918 OldProto->getExtProtoInfo()); 1919 New->setType(NewQType); 1920 New->setHasInheritedPrototype(); 1921 1922 // Synthesize a parameter for each argument type. 1923 SmallVector<ParmVarDecl*, 16> Params; 1924 for (FunctionProtoType::arg_type_iterator 1925 ParamType = OldProto->arg_type_begin(), 1926 ParamEnd = OldProto->arg_type_end(); 1927 ParamType != ParamEnd; ++ParamType) { 1928 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1929 SourceLocation(), 1930 SourceLocation(), 0, 1931 *ParamType, /*TInfo=*/0, 1932 SC_None, SC_None, 1933 0); 1934 Param->setScopeInfo(0, Params.size()); 1935 Param->setImplicit(); 1936 Params.push_back(Param); 1937 } 1938 1939 New->setParams(Params); 1940 } 1941 1942 return MergeCompatibleFunctionDecls(New, Old); 1943 } 1944 1945 // GNU C permits a K&R definition to follow a prototype declaration 1946 // if the declared types of the parameters in the K&R definition 1947 // match the types in the prototype declaration, even when the 1948 // promoted types of the parameters from the K&R definition differ 1949 // from the types in the prototype. GCC then keeps the types from 1950 // the prototype. 1951 // 1952 // If a variadic prototype is followed by a non-variadic K&R definition, 1953 // the K&R definition becomes variadic. This is sort of an edge case, but 1954 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1955 // C99 6.9.1p8. 1956 if (!getLangOptions().CPlusPlus && 1957 Old->hasPrototype() && !New->hasPrototype() && 1958 New->getType()->getAs<FunctionProtoType>() && 1959 Old->getNumParams() == New->getNumParams()) { 1960 SmallVector<QualType, 16> ArgTypes; 1961 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1962 const FunctionProtoType *OldProto 1963 = Old->getType()->getAs<FunctionProtoType>(); 1964 const FunctionProtoType *NewProto 1965 = New->getType()->getAs<FunctionProtoType>(); 1966 1967 // Determine whether this is the GNU C extension. 1968 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1969 NewProto->getResultType()); 1970 bool LooseCompatible = !MergedReturn.isNull(); 1971 for (unsigned Idx = 0, End = Old->getNumParams(); 1972 LooseCompatible && Idx != End; ++Idx) { 1973 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1974 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1975 if (Context.typesAreCompatible(OldParm->getType(), 1976 NewProto->getArgType(Idx))) { 1977 ArgTypes.push_back(NewParm->getType()); 1978 } else if (Context.typesAreCompatible(OldParm->getType(), 1979 NewParm->getType(), 1980 /*CompareUnqualified=*/true)) { 1981 GNUCompatibleParamWarning Warn 1982 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1983 Warnings.push_back(Warn); 1984 ArgTypes.push_back(NewParm->getType()); 1985 } else 1986 LooseCompatible = false; 1987 } 1988 1989 if (LooseCompatible) { 1990 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1991 Diag(Warnings[Warn].NewParm->getLocation(), 1992 diag::ext_param_promoted_not_compatible_with_prototype) 1993 << Warnings[Warn].PromotedType 1994 << Warnings[Warn].OldParm->getType(); 1995 if (Warnings[Warn].OldParm->getLocation().isValid()) 1996 Diag(Warnings[Warn].OldParm->getLocation(), 1997 diag::note_previous_declaration); 1998 } 1999 2000 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2001 ArgTypes.size(), 2002 OldProto->getExtProtoInfo())); 2003 return MergeCompatibleFunctionDecls(New, Old); 2004 } 2005 2006 // Fall through to diagnose conflicting types. 2007 } 2008 2009 // A function that has already been declared has been redeclared or defined 2010 // with a different type- show appropriate diagnostic 2011 if (unsigned BuiltinID = Old->getBuiltinID()) { 2012 // The user has declared a builtin function with an incompatible 2013 // signature. 2014 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2015 // The function the user is redeclaring is a library-defined 2016 // function like 'malloc' or 'printf'. Warn about the 2017 // redeclaration, then pretend that we don't know about this 2018 // library built-in. 2019 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2020 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2021 << Old << Old->getType(); 2022 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2023 Old->setInvalidDecl(); 2024 return false; 2025 } 2026 2027 PrevDiag = diag::note_previous_builtin_declaration; 2028 } 2029 2030 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2031 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2032 return true; 2033} 2034 2035/// \brief Completes the merge of two function declarations that are 2036/// known to be compatible. 2037/// 2038/// This routine handles the merging of attributes and other 2039/// properties of function declarations form the old declaration to 2040/// the new declaration, once we know that New is in fact a 2041/// redeclaration of Old. 2042/// 2043/// \returns false 2044bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2045 // Merge the attributes 2046 mergeDeclAttributes(New, Old); 2047 2048 // Merge the storage class. 2049 if (Old->getStorageClass() != SC_Extern && 2050 Old->getStorageClass() != SC_None) 2051 New->setStorageClass(Old->getStorageClass()); 2052 2053 // Merge "pure" flag. 2054 if (Old->isPure()) 2055 New->setPure(); 2056 2057 // Merge attributes from the parameters. These can mismatch with K&R 2058 // declarations. 2059 if (New->getNumParams() == Old->getNumParams()) 2060 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2061 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2062 Context); 2063 2064 if (getLangOptions().CPlusPlus) 2065 return MergeCXXFunctionDecl(New, Old); 2066 2067 return false; 2068} 2069 2070 2071void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2072 ObjCMethodDecl *oldMethod) { 2073 // We don't want to merge unavailable and deprecated attributes 2074 // except from interface to implementation. 2075 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2076 2077 // Merge the attributes. 2078 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2079 2080 // Merge attributes from the parameters. 2081 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2082 for (ObjCMethodDecl::param_iterator 2083 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2084 ni != ne; ++ni, ++oi) 2085 mergeParamDeclAttributes(*ni, *oi, Context); 2086 2087 CheckObjCMethodOverride(newMethod, oldMethod, true); 2088} 2089 2090/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2091/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2092/// emitting diagnostics as appropriate. 2093/// 2094/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2095/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2096/// check them before the initializer is attached. 2097/// 2098void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2099 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2100 return; 2101 2102 QualType MergedT; 2103 if (getLangOptions().CPlusPlus) { 2104 AutoType *AT = New->getType()->getContainedAutoType(); 2105 if (AT && !AT->isDeduced()) { 2106 // We don't know what the new type is until the initializer is attached. 2107 return; 2108 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2109 // These could still be something that needs exception specs checked. 2110 return MergeVarDeclExceptionSpecs(New, Old); 2111 } 2112 // C++ [basic.link]p10: 2113 // [...] the types specified by all declarations referring to a given 2114 // object or function shall be identical, except that declarations for an 2115 // array object can specify array types that differ by the presence or 2116 // absence of a major array bound (8.3.4). 2117 else if (Old->getType()->isIncompleteArrayType() && 2118 New->getType()->isArrayType()) { 2119 CanQual<ArrayType> OldArray 2120 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2121 CanQual<ArrayType> NewArray 2122 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2123 if (OldArray->getElementType() == NewArray->getElementType()) 2124 MergedT = New->getType(); 2125 } else if (Old->getType()->isArrayType() && 2126 New->getType()->isIncompleteArrayType()) { 2127 CanQual<ArrayType> OldArray 2128 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2129 CanQual<ArrayType> NewArray 2130 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2131 if (OldArray->getElementType() == NewArray->getElementType()) 2132 MergedT = Old->getType(); 2133 } else if (New->getType()->isObjCObjectPointerType() 2134 && Old->getType()->isObjCObjectPointerType()) { 2135 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2136 Old->getType()); 2137 } 2138 } else { 2139 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2140 } 2141 if (MergedT.isNull()) { 2142 Diag(New->getLocation(), diag::err_redefinition_different_type) 2143 << New->getDeclName(); 2144 Diag(Old->getLocation(), diag::note_previous_definition); 2145 return New->setInvalidDecl(); 2146 } 2147 New->setType(MergedT); 2148} 2149 2150/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2151/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2152/// situation, merging decls or emitting diagnostics as appropriate. 2153/// 2154/// Tentative definition rules (C99 6.9.2p2) are checked by 2155/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2156/// definitions here, since the initializer hasn't been attached. 2157/// 2158void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2159 // If the new decl is already invalid, don't do any other checking. 2160 if (New->isInvalidDecl()) 2161 return; 2162 2163 // Verify the old decl was also a variable. 2164 VarDecl *Old = 0; 2165 if (!Previous.isSingleResult() || 2166 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2167 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2168 << New->getDeclName(); 2169 Diag(Previous.getRepresentativeDecl()->getLocation(), 2170 diag::note_previous_definition); 2171 return New->setInvalidDecl(); 2172 } 2173 2174 // C++ [class.mem]p1: 2175 // A member shall not be declared twice in the member-specification [...] 2176 // 2177 // Here, we need only consider static data members. 2178 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2179 Diag(New->getLocation(), diag::err_duplicate_member) 2180 << New->getIdentifier(); 2181 Diag(Old->getLocation(), diag::note_previous_declaration); 2182 New->setInvalidDecl(); 2183 } 2184 2185 mergeDeclAttributes(New, Old); 2186 // Warn if an already-declared variable is made a weak_import in a subsequent 2187 // declaration 2188 if (New->getAttr<WeakImportAttr>() && 2189 Old->getStorageClass() == SC_None && 2190 !Old->getAttr<WeakImportAttr>()) { 2191 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 // Remove weak_import attribute on new declaration. 2194 New->dropAttr<WeakImportAttr>(); 2195 } 2196 2197 // Merge the types. 2198 MergeVarDeclTypes(New, Old); 2199 if (New->isInvalidDecl()) 2200 return; 2201 2202 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2203 if (New->getStorageClass() == SC_Static && 2204 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2205 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2206 Diag(Old->getLocation(), diag::note_previous_definition); 2207 return New->setInvalidDecl(); 2208 } 2209 // C99 6.2.2p4: 2210 // For an identifier declared with the storage-class specifier 2211 // extern in a scope in which a prior declaration of that 2212 // identifier is visible,23) if the prior declaration specifies 2213 // internal or external linkage, the linkage of the identifier at 2214 // the later declaration is the same as the linkage specified at 2215 // the prior declaration. If no prior declaration is visible, or 2216 // if the prior declaration specifies no linkage, then the 2217 // identifier has external linkage. 2218 if (New->hasExternalStorage() && Old->hasLinkage()) 2219 /* Okay */; 2220 else if (New->getStorageClass() != SC_Static && 2221 Old->getStorageClass() == SC_Static) { 2222 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2223 Diag(Old->getLocation(), diag::note_previous_definition); 2224 return New->setInvalidDecl(); 2225 } 2226 2227 // Check if extern is followed by non-extern and vice-versa. 2228 if (New->hasExternalStorage() && 2229 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2230 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2231 Diag(Old->getLocation(), diag::note_previous_definition); 2232 return New->setInvalidDecl(); 2233 } 2234 if (Old->hasExternalStorage() && 2235 !New->hasLinkage() && New->isLocalVarDecl()) { 2236 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2237 Diag(Old->getLocation(), diag::note_previous_definition); 2238 return New->setInvalidDecl(); 2239 } 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 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2366 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2367 if (getLangOptions().CPlusPlus || 2368 Record->getDeclContext()->isRecord()) 2369 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2370 2371 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2372 << DS.getSourceRange(); 2373 emittedWarning = true; 2374 } 2375 } 2376 2377 // Check for Microsoft C extension: anonymous struct. 2378 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2379 CurContext->isRecord() && 2380 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2381 // Handle 2 kinds of anonymous struct: 2382 // struct STRUCT; 2383 // and 2384 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2385 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2386 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2387 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2388 DS.getRepAsType().get()->isStructureType())) { 2389 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2390 << DS.getSourceRange(); 2391 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2392 } 2393 } 2394 2395 if (getLangOptions().CPlusPlus && 2396 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2397 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2398 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2399 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2400 Diag(Enum->getLocation(), diag::ext_no_declarators) 2401 << DS.getSourceRange(); 2402 emittedWarning = true; 2403 } 2404 2405 // Skip all the checks below if we have a type error. 2406 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2407 2408 if (!DS.isMissingDeclaratorOk()) { 2409 // Warn about typedefs of enums without names, since this is an 2410 // extension in both Microsoft and GNU. 2411 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2412 Tag && isa<EnumDecl>(Tag)) { 2413 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2414 << DS.getSourceRange(); 2415 return Tag; 2416 } 2417 2418 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2419 << DS.getSourceRange(); 2420 emittedWarning = true; 2421 } 2422 2423 // We're going to complain about a bunch of spurious specifiers; 2424 // only do this if we're declaring a tag, because otherwise we 2425 // should be getting diag::ext_no_declarators. 2426 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2427 return TagD; 2428 2429 // Note that a linkage-specification sets a storage class, but 2430 // 'extern "C" struct foo;' is actually valid and not theoretically 2431 // useless. 2432 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2433 if (!DS.isExternInLinkageSpec()) 2434 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2435 << DeclSpec::getSpecifierName(scs); 2436 2437 if (DS.isThreadSpecified()) 2438 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2439 if (DS.getTypeQualifiers()) { 2440 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2441 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2442 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2443 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2444 // Restrict is covered above. 2445 } 2446 if (DS.isInlineSpecified()) 2447 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2448 if (DS.isVirtualSpecified()) 2449 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2450 if (DS.isExplicitSpecified()) 2451 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2452 2453 if (DS.isModulePrivateSpecified() && 2454 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2455 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2456 << Tag->getTagKind() 2457 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2458 2459 // Warn about ignored type attributes, for example: 2460 // __attribute__((aligned)) struct A; 2461 // Attributes should be placed after tag to apply to type declaration. 2462 if (!DS.getAttributes().empty()) { 2463 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2464 if (TypeSpecType == DeclSpec::TST_class || 2465 TypeSpecType == DeclSpec::TST_struct || 2466 TypeSpecType == DeclSpec::TST_union || 2467 TypeSpecType == DeclSpec::TST_enum) { 2468 AttributeList* attrs = DS.getAttributes().getList(); 2469 while (attrs) { 2470 Diag(attrs->getScopeLoc(), 2471 diag::warn_declspec_attribute_ignored) 2472 << attrs->getName() 2473 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2474 TypeSpecType == DeclSpec::TST_struct ? 1 : 2475 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2476 attrs = attrs->getNext(); 2477 } 2478 } 2479 } 2480 2481 return TagD; 2482} 2483 2484/// We are trying to inject an anonymous member into the given scope; 2485/// check if there's an existing declaration that can't be overloaded. 2486/// 2487/// \return true if this is a forbidden redeclaration 2488static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2489 Scope *S, 2490 DeclContext *Owner, 2491 DeclarationName Name, 2492 SourceLocation NameLoc, 2493 unsigned diagnostic) { 2494 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2495 Sema::ForRedeclaration); 2496 if (!SemaRef.LookupName(R, S)) return false; 2497 2498 if (R.getAsSingle<TagDecl>()) 2499 return false; 2500 2501 // Pick a representative declaration. 2502 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2503 assert(PrevDecl && "Expected a non-null Decl"); 2504 2505 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2506 return false; 2507 2508 SemaRef.Diag(NameLoc, diagnostic) << Name; 2509 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2510 2511 return true; 2512} 2513 2514/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2515/// anonymous struct or union AnonRecord into the owning context Owner 2516/// and scope S. This routine will be invoked just after we realize 2517/// that an unnamed union or struct is actually an anonymous union or 2518/// struct, e.g., 2519/// 2520/// @code 2521/// union { 2522/// int i; 2523/// float f; 2524/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2525/// // f into the surrounding scope.x 2526/// @endcode 2527/// 2528/// This routine is recursive, injecting the names of nested anonymous 2529/// structs/unions into the owning context and scope as well. 2530static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2531 DeclContext *Owner, 2532 RecordDecl *AnonRecord, 2533 AccessSpecifier AS, 2534 SmallVector<NamedDecl*, 2> &Chaining, 2535 bool MSAnonStruct) { 2536 unsigned diagKind 2537 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2538 : diag::err_anonymous_struct_member_redecl; 2539 2540 bool Invalid = false; 2541 2542 // Look every FieldDecl and IndirectFieldDecl with a name. 2543 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2544 DEnd = AnonRecord->decls_end(); 2545 D != DEnd; ++D) { 2546 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2547 cast<NamedDecl>(*D)->getDeclName()) { 2548 ValueDecl *VD = cast<ValueDecl>(*D); 2549 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2550 VD->getLocation(), diagKind)) { 2551 // C++ [class.union]p2: 2552 // The names of the members of an anonymous union shall be 2553 // distinct from the names of any other entity in the 2554 // scope in which the anonymous union is declared. 2555 Invalid = true; 2556 } else { 2557 // C++ [class.union]p2: 2558 // For the purpose of name lookup, after the anonymous union 2559 // definition, the members of the anonymous union are 2560 // considered to have been defined in the scope in which the 2561 // anonymous union is declared. 2562 unsigned OldChainingSize = Chaining.size(); 2563 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2564 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2565 PE = IF->chain_end(); PI != PE; ++PI) 2566 Chaining.push_back(*PI); 2567 else 2568 Chaining.push_back(VD); 2569 2570 assert(Chaining.size() >= 2); 2571 NamedDecl **NamedChain = 2572 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2573 for (unsigned i = 0; i < Chaining.size(); i++) 2574 NamedChain[i] = Chaining[i]; 2575 2576 IndirectFieldDecl* IndirectField = 2577 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2578 VD->getIdentifier(), VD->getType(), 2579 NamedChain, Chaining.size()); 2580 2581 IndirectField->setAccess(AS); 2582 IndirectField->setImplicit(); 2583 SemaRef.PushOnScopeChains(IndirectField, S); 2584 2585 // That includes picking up the appropriate access specifier. 2586 if (AS != AS_none) IndirectField->setAccess(AS); 2587 2588 Chaining.resize(OldChainingSize); 2589 } 2590 } 2591 } 2592 2593 return Invalid; 2594} 2595 2596/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2597/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2598/// illegal input values are mapped to SC_None. 2599static StorageClass 2600StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2601 switch (StorageClassSpec) { 2602 case DeclSpec::SCS_unspecified: return SC_None; 2603 case DeclSpec::SCS_extern: return SC_Extern; 2604 case DeclSpec::SCS_static: return SC_Static; 2605 case DeclSpec::SCS_auto: return SC_Auto; 2606 case DeclSpec::SCS_register: return SC_Register; 2607 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2608 // Illegal SCSs map to None: error reporting is up to the caller. 2609 case DeclSpec::SCS_mutable: // Fall through. 2610 case DeclSpec::SCS_typedef: return SC_None; 2611 } 2612 llvm_unreachable("unknown storage class specifier"); 2613} 2614 2615/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2616/// a StorageClass. Any error reporting is up to the caller: 2617/// illegal input values are mapped to SC_None. 2618static StorageClass 2619StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2620 switch (StorageClassSpec) { 2621 case DeclSpec::SCS_unspecified: return SC_None; 2622 case DeclSpec::SCS_extern: return SC_Extern; 2623 case DeclSpec::SCS_static: return SC_Static; 2624 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2625 // Illegal SCSs map to None: error reporting is up to the caller. 2626 case DeclSpec::SCS_auto: // Fall through. 2627 case DeclSpec::SCS_mutable: // Fall through. 2628 case DeclSpec::SCS_register: // Fall through. 2629 case DeclSpec::SCS_typedef: return SC_None; 2630 } 2631 llvm_unreachable("unknown storage class specifier"); 2632} 2633 2634/// BuildAnonymousStructOrUnion - Handle the declaration of an 2635/// anonymous structure or union. Anonymous unions are a C++ feature 2636/// (C++ [class.union]) and a GNU C extension; anonymous structures 2637/// are a GNU C and GNU C++ extension. 2638Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2639 AccessSpecifier AS, 2640 RecordDecl *Record) { 2641 DeclContext *Owner = Record->getDeclContext(); 2642 2643 // Diagnose whether this anonymous struct/union is an extension. 2644 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2645 Diag(Record->getLocation(), diag::ext_anonymous_union); 2646 else if (!Record->isUnion()) 2647 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2648 2649 // C and C++ require different kinds of checks for anonymous 2650 // structs/unions. 2651 bool Invalid = false; 2652 if (getLangOptions().CPlusPlus) { 2653 const char* PrevSpec = 0; 2654 unsigned DiagID; 2655 if (Record->isUnion()) { 2656 // C++ [class.union]p6: 2657 // Anonymous unions declared in a named namespace or in the 2658 // global namespace shall be declared static. 2659 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2660 (isa<TranslationUnitDecl>(Owner) || 2661 (isa<NamespaceDecl>(Owner) && 2662 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2663 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2664 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2665 2666 // Recover by adding 'static'. 2667 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2668 PrevSpec, DiagID); 2669 } 2670 // C++ [class.union]p6: 2671 // A storage class is not allowed in a declaration of an 2672 // anonymous union in a class scope. 2673 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2674 isa<RecordDecl>(Owner)) { 2675 Diag(DS.getStorageClassSpecLoc(), 2676 diag::err_anonymous_union_with_storage_spec) 2677 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2678 2679 // Recover by removing the storage specifier. 2680 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2681 SourceLocation(), 2682 PrevSpec, DiagID); 2683 } 2684 } 2685 2686 // Ignore const/volatile/restrict qualifiers. 2687 if (DS.getTypeQualifiers()) { 2688 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2689 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2690 << Record->isUnion() << 0 2691 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2692 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2693 Diag(DS.getVolatileSpecLoc(), 2694 diag::ext_anonymous_struct_union_qualified) 2695 << Record->isUnion() << 1 2696 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2697 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2698 Diag(DS.getRestrictSpecLoc(), 2699 diag::ext_anonymous_struct_union_qualified) 2700 << Record->isUnion() << 2 2701 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2702 2703 DS.ClearTypeQualifiers(); 2704 } 2705 2706 // C++ [class.union]p2: 2707 // The member-specification of an anonymous union shall only 2708 // define non-static data members. [Note: nested types and 2709 // functions cannot be declared within an anonymous union. ] 2710 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2711 MemEnd = Record->decls_end(); 2712 Mem != MemEnd; ++Mem) { 2713 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2714 // C++ [class.union]p3: 2715 // An anonymous union shall not have private or protected 2716 // members (clause 11). 2717 assert(FD->getAccess() != AS_none); 2718 if (FD->getAccess() != AS_public) { 2719 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2720 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2721 Invalid = true; 2722 } 2723 2724 // C++ [class.union]p1 2725 // An object of a class with a non-trivial constructor, a non-trivial 2726 // copy constructor, a non-trivial destructor, or a non-trivial copy 2727 // assignment operator cannot be a member of a union, nor can an 2728 // array of such objects. 2729 if (CheckNontrivialField(FD)) 2730 Invalid = true; 2731 } else if ((*Mem)->isImplicit()) { 2732 // Any implicit members are fine. 2733 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2734 // This is a type that showed up in an 2735 // elaborated-type-specifier inside the anonymous struct or 2736 // union, but which actually declares a type outside of the 2737 // anonymous struct or union. It's okay. 2738 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2739 if (!MemRecord->isAnonymousStructOrUnion() && 2740 MemRecord->getDeclName()) { 2741 // Visual C++ allows type definition in anonymous struct or union. 2742 if (getLangOptions().MicrosoftExt) 2743 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2744 << (int)Record->isUnion(); 2745 else { 2746 // This is a nested type declaration. 2747 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2748 << (int)Record->isUnion(); 2749 Invalid = true; 2750 } 2751 } 2752 } else if (isa<AccessSpecDecl>(*Mem)) { 2753 // Any access specifier is fine. 2754 } else { 2755 // We have something that isn't a non-static data 2756 // member. Complain about it. 2757 unsigned DK = diag::err_anonymous_record_bad_member; 2758 if (isa<TypeDecl>(*Mem)) 2759 DK = diag::err_anonymous_record_with_type; 2760 else if (isa<FunctionDecl>(*Mem)) 2761 DK = diag::err_anonymous_record_with_function; 2762 else if (isa<VarDecl>(*Mem)) 2763 DK = diag::err_anonymous_record_with_static; 2764 2765 // Visual C++ allows type definition in anonymous struct or union. 2766 if (getLangOptions().MicrosoftExt && 2767 DK == diag::err_anonymous_record_with_type) 2768 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2769 << (int)Record->isUnion(); 2770 else { 2771 Diag((*Mem)->getLocation(), DK) 2772 << (int)Record->isUnion(); 2773 Invalid = true; 2774 } 2775 } 2776 } 2777 } 2778 2779 if (!Record->isUnion() && !Owner->isRecord()) { 2780 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2781 << (int)getLangOptions().CPlusPlus; 2782 Invalid = true; 2783 } 2784 2785 // Mock up a declarator. 2786 Declarator Dc(DS, Declarator::MemberContext); 2787 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2788 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2789 2790 // Create a declaration for this anonymous struct/union. 2791 NamedDecl *Anon = 0; 2792 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2793 Anon = FieldDecl::Create(Context, OwningClass, 2794 DS.getSourceRange().getBegin(), 2795 Record->getLocation(), 2796 /*IdentifierInfo=*/0, 2797 Context.getTypeDeclType(Record), 2798 TInfo, 2799 /*BitWidth=*/0, /*Mutable=*/false, 2800 /*HasInit=*/false); 2801 Anon->setAccess(AS); 2802 if (getLangOptions().CPlusPlus) 2803 FieldCollector->Add(cast<FieldDecl>(Anon)); 2804 } else { 2805 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2806 assert(SCSpec != DeclSpec::SCS_typedef && 2807 "Parser allowed 'typedef' as storage class VarDecl."); 2808 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2809 if (SCSpec == DeclSpec::SCS_mutable) { 2810 // mutable can only appear on non-static class members, so it's always 2811 // an error here 2812 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2813 Invalid = true; 2814 SC = SC_None; 2815 } 2816 SCSpec = DS.getStorageClassSpecAsWritten(); 2817 VarDecl::StorageClass SCAsWritten 2818 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2819 2820 Anon = VarDecl::Create(Context, Owner, 2821 DS.getSourceRange().getBegin(), 2822 Record->getLocation(), /*IdentifierInfo=*/0, 2823 Context.getTypeDeclType(Record), 2824 TInfo, SC, SCAsWritten); 2825 2826 // Default-initialize the implicit variable. This initialization will be 2827 // trivial in almost all cases, except if a union member has an in-class 2828 // initializer: 2829 // union { int n = 0; }; 2830 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2831 } 2832 Anon->setImplicit(); 2833 2834 // Add the anonymous struct/union object to the current 2835 // context. We'll be referencing this object when we refer to one of 2836 // its members. 2837 Owner->addDecl(Anon); 2838 2839 // Inject the members of the anonymous struct/union into the owning 2840 // context and into the identifier resolver chain for name lookup 2841 // purposes. 2842 SmallVector<NamedDecl*, 2> Chain; 2843 Chain.push_back(Anon); 2844 2845 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2846 Chain, false)) 2847 Invalid = true; 2848 2849 // Mark this as an anonymous struct/union type. Note that we do not 2850 // do this until after we have already checked and injected the 2851 // members of this anonymous struct/union type, because otherwise 2852 // the members could be injected twice: once by DeclContext when it 2853 // builds its lookup table, and once by 2854 // InjectAnonymousStructOrUnionMembers. 2855 Record->setAnonymousStructOrUnion(true); 2856 2857 if (Invalid) 2858 Anon->setInvalidDecl(); 2859 2860 return Anon; 2861} 2862 2863/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2864/// Microsoft C anonymous structure. 2865/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2866/// Example: 2867/// 2868/// struct A { int a; }; 2869/// struct B { struct A; int b; }; 2870/// 2871/// void foo() { 2872/// B var; 2873/// var.a = 3; 2874/// } 2875/// 2876Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2877 RecordDecl *Record) { 2878 2879 // If there is no Record, get the record via the typedef. 2880 if (!Record) 2881 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2882 2883 // Mock up a declarator. 2884 Declarator Dc(DS, Declarator::TypeNameContext); 2885 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2886 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2887 2888 // Create a declaration for this anonymous struct. 2889 NamedDecl* Anon = FieldDecl::Create(Context, 2890 cast<RecordDecl>(CurContext), 2891 DS.getSourceRange().getBegin(), 2892 DS.getSourceRange().getBegin(), 2893 /*IdentifierInfo=*/0, 2894 Context.getTypeDeclType(Record), 2895 TInfo, 2896 /*BitWidth=*/0, /*Mutable=*/false, 2897 /*HasInit=*/false); 2898 Anon->setImplicit(); 2899 2900 // Add the anonymous struct object to the current context. 2901 CurContext->addDecl(Anon); 2902 2903 // Inject the members of the anonymous struct into the current 2904 // context and into the identifier resolver chain for name lookup 2905 // purposes. 2906 SmallVector<NamedDecl*, 2> Chain; 2907 Chain.push_back(Anon); 2908 2909 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2910 Record->getDefinition(), 2911 AS_none, Chain, true)) 2912 Anon->setInvalidDecl(); 2913 2914 return Anon; 2915} 2916 2917/// GetNameForDeclarator - Determine the full declaration name for the 2918/// given Declarator. 2919DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2920 return GetNameFromUnqualifiedId(D.getName()); 2921} 2922 2923/// \brief Retrieves the declaration name from a parsed unqualified-id. 2924DeclarationNameInfo 2925Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2926 DeclarationNameInfo NameInfo; 2927 NameInfo.setLoc(Name.StartLocation); 2928 2929 switch (Name.getKind()) { 2930 2931 case UnqualifiedId::IK_ImplicitSelfParam: 2932 case UnqualifiedId::IK_Identifier: 2933 NameInfo.setName(Name.Identifier); 2934 NameInfo.setLoc(Name.StartLocation); 2935 return NameInfo; 2936 2937 case UnqualifiedId::IK_OperatorFunctionId: 2938 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2939 Name.OperatorFunctionId.Operator)); 2940 NameInfo.setLoc(Name.StartLocation); 2941 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2942 = Name.OperatorFunctionId.SymbolLocations[0]; 2943 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2944 = Name.EndLocation.getRawEncoding(); 2945 return NameInfo; 2946 2947 case UnqualifiedId::IK_LiteralOperatorId: 2948 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2949 Name.Identifier)); 2950 NameInfo.setLoc(Name.StartLocation); 2951 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2952 return NameInfo; 2953 2954 case UnqualifiedId::IK_ConversionFunctionId: { 2955 TypeSourceInfo *TInfo; 2956 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2957 if (Ty.isNull()) 2958 return DeclarationNameInfo(); 2959 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2960 Context.getCanonicalType(Ty))); 2961 NameInfo.setLoc(Name.StartLocation); 2962 NameInfo.setNamedTypeInfo(TInfo); 2963 return NameInfo; 2964 } 2965 2966 case UnqualifiedId::IK_ConstructorName: { 2967 TypeSourceInfo *TInfo; 2968 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2969 if (Ty.isNull()) 2970 return DeclarationNameInfo(); 2971 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2972 Context.getCanonicalType(Ty))); 2973 NameInfo.setLoc(Name.StartLocation); 2974 NameInfo.setNamedTypeInfo(TInfo); 2975 return NameInfo; 2976 } 2977 2978 case UnqualifiedId::IK_ConstructorTemplateId: { 2979 // In well-formed code, we can only have a constructor 2980 // template-id that refers to the current context, so go there 2981 // to find the actual type being constructed. 2982 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2983 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2984 return DeclarationNameInfo(); 2985 2986 // Determine the type of the class being constructed. 2987 QualType CurClassType = Context.getTypeDeclType(CurClass); 2988 2989 // FIXME: Check two things: that the template-id names the same type as 2990 // CurClassType, and that the template-id does not occur when the name 2991 // was qualified. 2992 2993 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2994 Context.getCanonicalType(CurClassType))); 2995 NameInfo.setLoc(Name.StartLocation); 2996 // FIXME: should we retrieve TypeSourceInfo? 2997 NameInfo.setNamedTypeInfo(0); 2998 return NameInfo; 2999 } 3000 3001 case UnqualifiedId::IK_DestructorName: { 3002 TypeSourceInfo *TInfo; 3003 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3004 if (Ty.isNull()) 3005 return DeclarationNameInfo(); 3006 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3007 Context.getCanonicalType(Ty))); 3008 NameInfo.setLoc(Name.StartLocation); 3009 NameInfo.setNamedTypeInfo(TInfo); 3010 return NameInfo; 3011 } 3012 3013 case UnqualifiedId::IK_TemplateId: { 3014 TemplateName TName = Name.TemplateId->Template.get(); 3015 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3016 return Context.getNameForTemplate(TName, TNameLoc); 3017 } 3018 3019 } // switch (Name.getKind()) 3020 3021 llvm_unreachable("Unknown name kind"); 3022} 3023 3024static QualType getCoreType(QualType Ty) { 3025 do { 3026 if (Ty->isPointerType() || Ty->isReferenceType()) 3027 Ty = Ty->getPointeeType(); 3028 else if (Ty->isArrayType()) 3029 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3030 else 3031 return Ty.withoutLocalFastQualifiers(); 3032 } while (true); 3033} 3034 3035/// hasSimilarParameters - Determine whether the C++ functions Declaration 3036/// and Definition have "nearly" matching parameters. This heuristic is 3037/// used to improve diagnostics in the case where an out-of-line function 3038/// definition doesn't match any declaration within the class or namespace. 3039/// Also sets Params to the list of indices to the parameters that differ 3040/// between the declaration and the definition. If hasSimilarParameters 3041/// returns true and Params is empty, then all of the parameters match. 3042static bool hasSimilarParameters(ASTContext &Context, 3043 FunctionDecl *Declaration, 3044 FunctionDecl *Definition, 3045 llvm::SmallVectorImpl<unsigned> &Params) { 3046 Params.clear(); 3047 if (Declaration->param_size() != Definition->param_size()) 3048 return false; 3049 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3050 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3051 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3052 3053 // The parameter types are identical 3054 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3055 continue; 3056 3057 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3058 QualType DefParamBaseTy = getCoreType(DefParamTy); 3059 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3060 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3061 3062 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3063 (DeclTyName && DeclTyName == DefTyName)) 3064 Params.push_back(Idx); 3065 else // The two parameters aren't even close 3066 return false; 3067 } 3068 3069 return true; 3070} 3071 3072/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3073/// declarator needs to be rebuilt in the current instantiation. 3074/// Any bits of declarator which appear before the name are valid for 3075/// consideration here. That's specifically the type in the decl spec 3076/// and the base type in any member-pointer chunks. 3077static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3078 DeclarationName Name) { 3079 // The types we specifically need to rebuild are: 3080 // - typenames, typeofs, and decltypes 3081 // - types which will become injected class names 3082 // Of course, we also need to rebuild any type referencing such a 3083 // type. It's safest to just say "dependent", but we call out a 3084 // few cases here. 3085 3086 DeclSpec &DS = D.getMutableDeclSpec(); 3087 switch (DS.getTypeSpecType()) { 3088 case DeclSpec::TST_typename: 3089 case DeclSpec::TST_typeofType: 3090 case DeclSpec::TST_decltype: 3091 case DeclSpec::TST_underlyingType: 3092 case DeclSpec::TST_atomic: { 3093 // Grab the type from the parser. 3094 TypeSourceInfo *TSI = 0; 3095 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3096 if (T.isNull() || !T->isDependentType()) break; 3097 3098 // Make sure there's a type source info. This isn't really much 3099 // of a waste; most dependent types should have type source info 3100 // attached already. 3101 if (!TSI) 3102 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3103 3104 // Rebuild the type in the current instantiation. 3105 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3106 if (!TSI) return true; 3107 3108 // Store the new type back in the decl spec. 3109 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3110 DS.UpdateTypeRep(LocType); 3111 break; 3112 } 3113 3114 case DeclSpec::TST_typeofExpr: { 3115 Expr *E = DS.getRepAsExpr(); 3116 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3117 if (Result.isInvalid()) return true; 3118 DS.UpdateExprRep(Result.get()); 3119 break; 3120 } 3121 3122 default: 3123 // Nothing to do for these decl specs. 3124 break; 3125 } 3126 3127 // It doesn't matter what order we do this in. 3128 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3129 DeclaratorChunk &Chunk = D.getTypeObject(I); 3130 3131 // The only type information in the declarator which can come 3132 // before the declaration name is the base type of a member 3133 // pointer. 3134 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3135 continue; 3136 3137 // Rebuild the scope specifier in-place. 3138 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3139 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3140 return true; 3141 } 3142 3143 return false; 3144} 3145 3146Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3147 D.setFunctionDefinitionKind(FDK_Declaration); 3148 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3149 3150 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3151 Dcl->getDeclContext()->isFileContext()) 3152 Dcl->setTopLevelDeclInObjCContainer(); 3153 3154 return Dcl; 3155} 3156 3157/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3158/// If T is the name of a class, then each of the following shall have a 3159/// name different from T: 3160/// - every static data member of class T; 3161/// - every member function of class T 3162/// - every member of class T that is itself a type; 3163/// \returns true if the declaration name violates these rules. 3164bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3165 DeclarationNameInfo NameInfo) { 3166 DeclarationName Name = NameInfo.getName(); 3167 3168 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3169 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3170 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3171 return true; 3172 } 3173 3174 return false; 3175} 3176 3177Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3178 MultiTemplateParamsArg TemplateParamLists) { 3179 // TODO: consider using NameInfo for diagnostic. 3180 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3181 DeclarationName Name = NameInfo.getName(); 3182 3183 // All of these full declarators require an identifier. If it doesn't have 3184 // one, the ParsedFreeStandingDeclSpec action should be used. 3185 if (!Name) { 3186 if (!D.isInvalidType()) // Reject this if we think it is valid. 3187 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3188 diag::err_declarator_need_ident) 3189 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3190 return 0; 3191 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3192 return 0; 3193 3194 // The scope passed in may not be a decl scope. Zip up the scope tree until 3195 // we find one that is. 3196 while ((S->getFlags() & Scope::DeclScope) == 0 || 3197 (S->getFlags() & Scope::TemplateParamScope) != 0) 3198 S = S->getParent(); 3199 3200 DeclContext *DC = CurContext; 3201 if (D.getCXXScopeSpec().isInvalid()) 3202 D.setInvalidType(); 3203 else if (D.getCXXScopeSpec().isSet()) { 3204 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3205 UPPC_DeclarationQualifier)) 3206 return 0; 3207 3208 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3209 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3210 if (!DC) { 3211 // If we could not compute the declaration context, it's because the 3212 // declaration context is dependent but does not refer to a class, 3213 // class template, or class template partial specialization. Complain 3214 // and return early, to avoid the coming semantic disaster. 3215 Diag(D.getIdentifierLoc(), 3216 diag::err_template_qualified_declarator_no_match) 3217 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3218 << D.getCXXScopeSpec().getRange(); 3219 return 0; 3220 } 3221 bool IsDependentContext = DC->isDependentContext(); 3222 3223 if (!IsDependentContext && 3224 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3225 return 0; 3226 3227 if (isa<CXXRecordDecl>(DC)) { 3228 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3229 Diag(D.getIdentifierLoc(), 3230 diag::err_member_def_undefined_record) 3231 << Name << DC << D.getCXXScopeSpec().getRange(); 3232 D.setInvalidType(); 3233 } else if (isa<CXXRecordDecl>(CurContext) && 3234 !D.getDeclSpec().isFriendSpecified()) { 3235 // The user provided a superfluous scope specifier inside a class 3236 // definition: 3237 // 3238 // class X { 3239 // void X::f(); 3240 // }; 3241 if (CurContext->Equals(DC)) { 3242 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3243 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3244 } else { 3245 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3246 << Name << D.getCXXScopeSpec().getRange(); 3247 3248 // C++ constructors and destructors with incorrect scopes can break 3249 // our AST invariants by having the wrong underlying types. If 3250 // that's the case, then drop this declaration entirely. 3251 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3252 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3253 !Context.hasSameType(Name.getCXXNameType(), 3254 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3255 return 0; 3256 } 3257 3258 // Pretend that this qualifier was not here. 3259 D.getCXXScopeSpec().clear(); 3260 } 3261 } 3262 3263 // Check whether we need to rebuild the type of the given 3264 // declaration in the current instantiation. 3265 if (EnteringContext && IsDependentContext && 3266 TemplateParamLists.size() != 0) { 3267 ContextRAII SavedContext(*this, DC); 3268 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3269 D.setInvalidType(); 3270 } 3271 } 3272 3273 if (DiagnoseClassNameShadow(DC, NameInfo)) 3274 // If this is a typedef, we'll end up spewing multiple diagnostics. 3275 // Just return early; it's safer. 3276 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3277 return 0; 3278 3279 NamedDecl *New; 3280 3281 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3282 QualType R = TInfo->getType(); 3283 3284 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3285 UPPC_DeclarationType)) 3286 D.setInvalidType(); 3287 3288 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3289 ForRedeclaration); 3290 3291 // See if this is a redefinition of a variable in the same scope. 3292 if (!D.getCXXScopeSpec().isSet()) { 3293 bool IsLinkageLookup = false; 3294 3295 // If the declaration we're planning to build will be a function 3296 // or object with linkage, then look for another declaration with 3297 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3298 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3299 /* Do nothing*/; 3300 else if (R->isFunctionType()) { 3301 if (CurContext->isFunctionOrMethod() || 3302 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3303 IsLinkageLookup = true; 3304 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3305 IsLinkageLookup = true; 3306 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3307 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3308 IsLinkageLookup = true; 3309 3310 if (IsLinkageLookup) 3311 Previous.clear(LookupRedeclarationWithLinkage); 3312 3313 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3314 } else { // Something like "int foo::x;" 3315 LookupQualifiedName(Previous, DC); 3316 3317 // Don't consider using declarations as previous declarations for 3318 // out-of-line members. 3319 RemoveUsingDecls(Previous); 3320 3321 // C++ 7.3.1.2p2: 3322 // Members (including explicit specializations of templates) of a named 3323 // namespace can also be defined outside that namespace by explicit 3324 // qualification of the name being defined, provided that the entity being 3325 // defined was already declared in the namespace and the definition appears 3326 // after the point of declaration in a namespace that encloses the 3327 // declarations namespace. 3328 // 3329 // Note that we only check the context at this point. We don't yet 3330 // have enough information to make sure that PrevDecl is actually 3331 // the declaration we want to match. For example, given: 3332 // 3333 // class X { 3334 // void f(); 3335 // void f(float); 3336 // }; 3337 // 3338 // void X::f(int) { } // ill-formed 3339 // 3340 // In this case, PrevDecl will point to the overload set 3341 // containing the two f's declared in X, but neither of them 3342 // matches. 3343 3344 // First check whether we named the global scope. 3345 if (isa<TranslationUnitDecl>(DC)) { 3346 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3347 << Name << D.getCXXScopeSpec().getRange(); 3348 } else { 3349 DeclContext *Cur = CurContext; 3350 while (isa<LinkageSpecDecl>(Cur)) 3351 Cur = Cur->getParent(); 3352 if (!Cur->Encloses(DC)) { 3353 // The qualifying scope doesn't enclose the original declaration. 3354 // Emit diagnostic based on current scope. 3355 SourceLocation L = D.getIdentifierLoc(); 3356 SourceRange R = D.getCXXScopeSpec().getRange(); 3357 if (isa<FunctionDecl>(Cur)) 3358 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3359 else 3360 Diag(L, diag::err_invalid_declarator_scope) 3361 << Name << cast<NamedDecl>(DC) << R; 3362 D.setInvalidType(); 3363 } 3364 3365 // C++11 8.3p1: 3366 // ... "The nested-name-specifier of the qualified declarator-id shall 3367 // not begin with a decltype-specifer" 3368 NestedNameSpecifierLoc SpecLoc = 3369 D.getCXXScopeSpec().getWithLocInContext(Context); 3370 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3371 "NestedNameSpecifierLoc"); 3372 while (SpecLoc.getPrefix()) 3373 SpecLoc = SpecLoc.getPrefix(); 3374 if (dyn_cast_or_null<DecltypeType>( 3375 SpecLoc.getNestedNameSpecifier()->getAsType())) 3376 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3377 << SpecLoc.getTypeLoc().getSourceRange(); 3378 } 3379 } 3380 3381 if (Previous.isSingleResult() && 3382 Previous.getFoundDecl()->isTemplateParameter()) { 3383 // Maybe we will complain about the shadowed template parameter. 3384 if (!D.isInvalidType()) 3385 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3386 Previous.getFoundDecl()); 3387 3388 // Just pretend that we didn't see the previous declaration. 3389 Previous.clear(); 3390 } 3391 3392 // In C++, the previous declaration we find might be a tag type 3393 // (class or enum). In this case, the new declaration will hide the 3394 // tag type. Note that this does does not apply if we're declaring a 3395 // typedef (C++ [dcl.typedef]p4). 3396 if (Previous.isSingleTagDecl() && 3397 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3398 Previous.clear(); 3399 3400 bool AddToScope = true; 3401 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3402 if (TemplateParamLists.size()) { 3403 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3404 return 0; 3405 } 3406 3407 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3408 } else if (R->isFunctionType()) { 3409 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3410 move(TemplateParamLists), 3411 AddToScope); 3412 } else { 3413 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3414 move(TemplateParamLists)); 3415 } 3416 3417 if (New == 0) 3418 return 0; 3419 3420 // If this has an identifier and is not an invalid redeclaration or 3421 // function template specialization, add it to the scope stack. 3422 if (New->getDeclName() && AddToScope && 3423 !(D.isRedeclaration() && New->isInvalidDecl())) 3424 PushOnScopeChains(New, S); 3425 3426 return New; 3427} 3428 3429/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3430/// types into constant array types in certain situations which would otherwise 3431/// be errors (for GCC compatibility). 3432static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3433 ASTContext &Context, 3434 bool &SizeIsNegative, 3435 llvm::APSInt &Oversized) { 3436 // This method tries to turn a variable array into a constant 3437 // array even when the size isn't an ICE. This is necessary 3438 // for compatibility with code that depends on gcc's buggy 3439 // constant expression folding, like struct {char x[(int)(char*)2];} 3440 SizeIsNegative = false; 3441 Oversized = 0; 3442 3443 if (T->isDependentType()) 3444 return QualType(); 3445 3446 QualifierCollector Qs; 3447 const Type *Ty = Qs.strip(T); 3448 3449 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3450 QualType Pointee = PTy->getPointeeType(); 3451 QualType FixedType = 3452 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3453 Oversized); 3454 if (FixedType.isNull()) return FixedType; 3455 FixedType = Context.getPointerType(FixedType); 3456 return Qs.apply(Context, FixedType); 3457 } 3458 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3459 QualType Inner = PTy->getInnerType(); 3460 QualType FixedType = 3461 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3462 Oversized); 3463 if (FixedType.isNull()) return FixedType; 3464 FixedType = Context.getParenType(FixedType); 3465 return Qs.apply(Context, FixedType); 3466 } 3467 3468 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3469 if (!VLATy) 3470 return QualType(); 3471 // FIXME: We should probably handle this case 3472 if (VLATy->getElementType()->isVariablyModifiedType()) 3473 return QualType(); 3474 3475 llvm::APSInt Res; 3476 if (!VLATy->getSizeExpr() || 3477 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3478 return QualType(); 3479 3480 // Check whether the array size is negative. 3481 if (Res.isSigned() && Res.isNegative()) { 3482 SizeIsNegative = true; 3483 return QualType(); 3484 } 3485 3486 // Check whether the array is too large to be addressed. 3487 unsigned ActiveSizeBits 3488 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3489 Res); 3490 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3491 Oversized = Res; 3492 return QualType(); 3493 } 3494 3495 return Context.getConstantArrayType(VLATy->getElementType(), 3496 Res, ArrayType::Normal, 0); 3497} 3498 3499/// \brief Register the given locally-scoped external C declaration so 3500/// that it can be found later for redeclarations 3501void 3502Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3503 const LookupResult &Previous, 3504 Scope *S) { 3505 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3506 "Decl is not a locally-scoped decl!"); 3507 // Note that we have a locally-scoped external with this name. 3508 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3509 3510 if (!Previous.isSingleResult()) 3511 return; 3512 3513 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3514 3515 // If there was a previous declaration of this variable, it may be 3516 // in our identifier chain. Update the identifier chain with the new 3517 // declaration. 3518 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3519 // The previous declaration was found on the identifer resolver 3520 // chain, so remove it from its scope. 3521 3522 if (S->isDeclScope(PrevDecl)) { 3523 // Special case for redeclarations in the SAME scope. 3524 // Because this declaration is going to be added to the identifier chain 3525 // later, we should temporarily take it OFF the chain. 3526 IdResolver.RemoveDecl(ND); 3527 3528 } else { 3529 // Find the scope for the original declaration. 3530 while (S && !S->isDeclScope(PrevDecl)) 3531 S = S->getParent(); 3532 } 3533 3534 if (S) 3535 S->RemoveDecl(PrevDecl); 3536 } 3537} 3538 3539llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3540Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3541 if (ExternalSource) { 3542 // Load locally-scoped external decls from the external source. 3543 SmallVector<NamedDecl *, 4> Decls; 3544 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3545 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3546 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3547 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3548 if (Pos == LocallyScopedExternalDecls.end()) 3549 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3550 } 3551 } 3552 3553 return LocallyScopedExternalDecls.find(Name); 3554} 3555 3556/// \brief Diagnose function specifiers on a declaration of an identifier that 3557/// does not identify a function. 3558void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3559 // FIXME: We should probably indicate the identifier in question to avoid 3560 // confusion for constructs like "inline int a(), b;" 3561 if (D.getDeclSpec().isInlineSpecified()) 3562 Diag(D.getDeclSpec().getInlineSpecLoc(), 3563 diag::err_inline_non_function); 3564 3565 if (D.getDeclSpec().isVirtualSpecified()) 3566 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3567 diag::err_virtual_non_function); 3568 3569 if (D.getDeclSpec().isExplicitSpecified()) 3570 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3571 diag::err_explicit_non_function); 3572} 3573 3574NamedDecl* 3575Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3576 TypeSourceInfo *TInfo, LookupResult &Previous) { 3577 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3578 if (D.getCXXScopeSpec().isSet()) { 3579 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3580 << D.getCXXScopeSpec().getRange(); 3581 D.setInvalidType(); 3582 // Pretend we didn't see the scope specifier. 3583 DC = CurContext; 3584 Previous.clear(); 3585 } 3586 3587 if (getLangOptions().CPlusPlus) { 3588 // Check that there are no default arguments (C++ only). 3589 CheckExtraCXXDefaultArguments(D); 3590 } 3591 3592 DiagnoseFunctionSpecifiers(D); 3593 3594 if (D.getDeclSpec().isThreadSpecified()) 3595 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3596 if (D.getDeclSpec().isConstexprSpecified()) 3597 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3598 << 1; 3599 3600 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3601 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3602 << D.getName().getSourceRange(); 3603 return 0; 3604 } 3605 3606 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3607 if (!NewTD) return 0; 3608 3609 // Handle attributes prior to checking for duplicates in MergeVarDecl 3610 ProcessDeclAttributes(S, NewTD, D); 3611 3612 CheckTypedefForVariablyModifiedType(S, NewTD); 3613 3614 bool Redeclaration = D.isRedeclaration(); 3615 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3616 D.setRedeclaration(Redeclaration); 3617 return ND; 3618} 3619 3620void 3621Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3622 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3623 // then it shall have block scope. 3624 // Note that variably modified types must be fixed before merging the decl so 3625 // that redeclarations will match. 3626 QualType T = NewTD->getUnderlyingType(); 3627 if (T->isVariablyModifiedType()) { 3628 getCurFunction()->setHasBranchProtectedScope(); 3629 3630 if (S->getFnParent() == 0) { 3631 bool SizeIsNegative; 3632 llvm::APSInt Oversized; 3633 QualType FixedTy = 3634 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3635 Oversized); 3636 if (!FixedTy.isNull()) { 3637 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3638 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3639 } else { 3640 if (SizeIsNegative) 3641 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3642 else if (T->isVariableArrayType()) 3643 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3644 else if (Oversized.getBoolValue()) 3645 Diag(NewTD->getLocation(), diag::err_array_too_large) 3646 << Oversized.toString(10); 3647 else 3648 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3649 NewTD->setInvalidDecl(); 3650 } 3651 } 3652 } 3653} 3654 3655 3656/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3657/// declares a typedef-name, either using the 'typedef' type specifier or via 3658/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3659NamedDecl* 3660Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3661 LookupResult &Previous, bool &Redeclaration) { 3662 // Merge the decl with the existing one if appropriate. If the decl is 3663 // in an outer scope, it isn't the same thing. 3664 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3665 /*ExplicitInstantiationOrSpecialization=*/false); 3666 if (!Previous.empty()) { 3667 Redeclaration = true; 3668 MergeTypedefNameDecl(NewTD, Previous); 3669 } 3670 3671 // If this is the C FILE type, notify the AST context. 3672 if (IdentifierInfo *II = NewTD->getIdentifier()) 3673 if (!NewTD->isInvalidDecl() && 3674 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3675 if (II->isStr("FILE")) 3676 Context.setFILEDecl(NewTD); 3677 else if (II->isStr("jmp_buf")) 3678 Context.setjmp_bufDecl(NewTD); 3679 else if (II->isStr("sigjmp_buf")) 3680 Context.setsigjmp_bufDecl(NewTD); 3681 else if (II->isStr("ucontext_t")) 3682 Context.setucontext_tDecl(NewTD); 3683 else if (II->isStr("__builtin_va_list")) 3684 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3685 } 3686 3687 return NewTD; 3688} 3689 3690/// \brief Determines whether the given declaration is an out-of-scope 3691/// previous declaration. 3692/// 3693/// This routine should be invoked when name lookup has found a 3694/// previous declaration (PrevDecl) that is not in the scope where a 3695/// new declaration by the same name is being introduced. If the new 3696/// declaration occurs in a local scope, previous declarations with 3697/// linkage may still be considered previous declarations (C99 3698/// 6.2.2p4-5, C++ [basic.link]p6). 3699/// 3700/// \param PrevDecl the previous declaration found by name 3701/// lookup 3702/// 3703/// \param DC the context in which the new declaration is being 3704/// declared. 3705/// 3706/// \returns true if PrevDecl is an out-of-scope previous declaration 3707/// for a new delcaration with the same name. 3708static bool 3709isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3710 ASTContext &Context) { 3711 if (!PrevDecl) 3712 return false; 3713 3714 if (!PrevDecl->hasLinkage()) 3715 return false; 3716 3717 if (Context.getLangOptions().CPlusPlus) { 3718 // C++ [basic.link]p6: 3719 // If there is a visible declaration of an entity with linkage 3720 // having the same name and type, ignoring entities declared 3721 // outside the innermost enclosing namespace scope, the block 3722 // scope declaration declares that same entity and receives the 3723 // linkage of the previous declaration. 3724 DeclContext *OuterContext = DC->getRedeclContext(); 3725 if (!OuterContext->isFunctionOrMethod()) 3726 // This rule only applies to block-scope declarations. 3727 return false; 3728 3729 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3730 if (PrevOuterContext->isRecord()) 3731 // We found a member function: ignore it. 3732 return false; 3733 3734 // Find the innermost enclosing namespace for the new and 3735 // previous declarations. 3736 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3737 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3738 3739 // The previous declaration is in a different namespace, so it 3740 // isn't the same function. 3741 if (!OuterContext->Equals(PrevOuterContext)) 3742 return false; 3743 } 3744 3745 return true; 3746} 3747 3748static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3749 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3750 if (!SS.isSet()) return; 3751 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3752} 3753 3754bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3755 QualType type = decl->getType(); 3756 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3757 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3758 // Various kinds of declaration aren't allowed to be __autoreleasing. 3759 unsigned kind = -1U; 3760 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3761 if (var->hasAttr<BlocksAttr>()) 3762 kind = 0; // __block 3763 else if (!var->hasLocalStorage()) 3764 kind = 1; // global 3765 } else if (isa<ObjCIvarDecl>(decl)) { 3766 kind = 3; // ivar 3767 } else if (isa<FieldDecl>(decl)) { 3768 kind = 2; // field 3769 } 3770 3771 if (kind != -1U) { 3772 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3773 << kind; 3774 } 3775 } else if (lifetime == Qualifiers::OCL_None) { 3776 // Try to infer lifetime. 3777 if (!type->isObjCLifetimeType()) 3778 return false; 3779 3780 lifetime = type->getObjCARCImplicitLifetime(); 3781 type = Context.getLifetimeQualifiedType(type, lifetime); 3782 decl->setType(type); 3783 } 3784 3785 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3786 // Thread-local variables cannot have lifetime. 3787 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3788 var->isThreadSpecified()) { 3789 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3790 << var->getType(); 3791 return true; 3792 } 3793 } 3794 3795 return false; 3796} 3797 3798NamedDecl* 3799Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3800 TypeSourceInfo *TInfo, LookupResult &Previous, 3801 MultiTemplateParamsArg TemplateParamLists) { 3802 QualType R = TInfo->getType(); 3803 DeclarationName Name = GetNameForDeclarator(D).getName(); 3804 3805 // Check that there are no default arguments (C++ only). 3806 if (getLangOptions().CPlusPlus) 3807 CheckExtraCXXDefaultArguments(D); 3808 3809 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3810 assert(SCSpec != DeclSpec::SCS_typedef && 3811 "Parser allowed 'typedef' as storage class VarDecl."); 3812 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3813 if (SCSpec == DeclSpec::SCS_mutable) { 3814 // mutable can only appear on non-static class members, so it's always 3815 // an error here 3816 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3817 D.setInvalidType(); 3818 SC = SC_None; 3819 } 3820 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3821 VarDecl::StorageClass SCAsWritten 3822 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3823 3824 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3825 if (!II) { 3826 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3827 << Name; 3828 return 0; 3829 } 3830 3831 DiagnoseFunctionSpecifiers(D); 3832 3833 if (!DC->isRecord() && S->getFnParent() == 0) { 3834 // C99 6.9p2: The storage-class specifiers auto and register shall not 3835 // appear in the declaration specifiers in an external declaration. 3836 if (SC == SC_Auto || SC == SC_Register) { 3837 3838 // If this is a register variable with an asm label specified, then this 3839 // is a GNU extension. 3840 if (SC == SC_Register && D.getAsmLabel()) 3841 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3842 else 3843 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3844 D.setInvalidType(); 3845 } 3846 } 3847 3848 if (getLangOptions().OpenCL) { 3849 // Set up the special work-group-local storage class for variables in the 3850 // OpenCL __local address space. 3851 if (R.getAddressSpace() == LangAS::opencl_local) 3852 SC = SC_OpenCLWorkGroupLocal; 3853 } 3854 3855 bool isExplicitSpecialization = false; 3856 VarDecl *NewVD; 3857 if (!getLangOptions().CPlusPlus) { 3858 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3859 D.getIdentifierLoc(), II, 3860 R, TInfo, SC, SCAsWritten); 3861 3862 if (D.isInvalidType()) 3863 NewVD->setInvalidDecl(); 3864 } else { 3865 if (DC->isRecord() && !CurContext->isRecord()) { 3866 // This is an out-of-line definition of a static data member. 3867 if (SC == SC_Static) { 3868 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3869 diag::err_static_out_of_line) 3870 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3871 } else if (SC == SC_None) 3872 SC = SC_Static; 3873 } 3874 if (SC == SC_Static) { 3875 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3876 if (RD->isLocalClass()) 3877 Diag(D.getIdentifierLoc(), 3878 diag::err_static_data_member_not_allowed_in_local_class) 3879 << Name << RD->getDeclName(); 3880 3881 // C++ [class.union]p1: If a union contains a static data member, 3882 // the program is ill-formed. 3883 // 3884 // We also disallow static data members in anonymous structs. 3885 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3886 Diag(D.getIdentifierLoc(), 3887 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3888 << Name << RD->isUnion(); 3889 } 3890 } 3891 3892 // Match up the template parameter lists with the scope specifier, then 3893 // determine whether we have a template or a template specialization. 3894 isExplicitSpecialization = false; 3895 bool Invalid = false; 3896 if (TemplateParameterList *TemplateParams 3897 = MatchTemplateParametersToScopeSpecifier( 3898 D.getDeclSpec().getSourceRange().getBegin(), 3899 D.getIdentifierLoc(), 3900 D.getCXXScopeSpec(), 3901 TemplateParamLists.get(), 3902 TemplateParamLists.size(), 3903 /*never a friend*/ false, 3904 isExplicitSpecialization, 3905 Invalid)) { 3906 if (TemplateParams->size() > 0) { 3907 // There is no such thing as a variable template. 3908 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3909 << II 3910 << SourceRange(TemplateParams->getTemplateLoc(), 3911 TemplateParams->getRAngleLoc()); 3912 return 0; 3913 } else { 3914 // There is an extraneous 'template<>' for this variable. Complain 3915 // about it, but allow the declaration of the variable. 3916 Diag(TemplateParams->getTemplateLoc(), 3917 diag::err_template_variable_noparams) 3918 << II 3919 << SourceRange(TemplateParams->getTemplateLoc(), 3920 TemplateParams->getRAngleLoc()); 3921 } 3922 } 3923 3924 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3925 D.getIdentifierLoc(), II, 3926 R, TInfo, SC, SCAsWritten); 3927 3928 // If this decl has an auto type in need of deduction, make a note of the 3929 // Decl so we can diagnose uses of it in its own initializer. 3930 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3931 R->getContainedAutoType()) 3932 ParsingInitForAutoVars.insert(NewVD); 3933 3934 if (D.isInvalidType() || Invalid) 3935 NewVD->setInvalidDecl(); 3936 3937 SetNestedNameSpecifier(NewVD, D); 3938 3939 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3940 NewVD->setTemplateParameterListsInfo(Context, 3941 TemplateParamLists.size(), 3942 TemplateParamLists.release()); 3943 } 3944 3945 if (D.getDeclSpec().isConstexprSpecified()) 3946 NewVD->setConstexpr(true); 3947 } 3948 3949 // Set the lexical context. If the declarator has a C++ scope specifier, the 3950 // lexical context will be different from the semantic context. 3951 NewVD->setLexicalDeclContext(CurContext); 3952 3953 if (D.getDeclSpec().isThreadSpecified()) { 3954 if (NewVD->hasLocalStorage()) 3955 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3956 else if (!Context.getTargetInfo().isTLSSupported()) 3957 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3958 else 3959 NewVD->setThreadSpecified(true); 3960 } 3961 3962 if (D.getDeclSpec().isModulePrivateSpecified()) { 3963 if (isExplicitSpecialization) 3964 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3965 << 2 3966 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3967 else if (NewVD->hasLocalStorage()) 3968 Diag(NewVD->getLocation(), diag::err_module_private_local) 3969 << 0 << NewVD->getDeclName() 3970 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3971 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3972 else 3973 NewVD->setModulePrivate(); 3974 } 3975 3976 // Handle attributes prior to checking for duplicates in MergeVarDecl 3977 ProcessDeclAttributes(S, NewVD, D); 3978 3979 // In auto-retain/release, infer strong retension for variables of 3980 // retainable type. 3981 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3982 NewVD->setInvalidDecl(); 3983 3984 // Handle GNU asm-label extension (encoded as an attribute). 3985 if (Expr *E = (Expr*)D.getAsmLabel()) { 3986 // The parser guarantees this is a string. 3987 StringLiteral *SE = cast<StringLiteral>(E); 3988 StringRef Label = SE->getString(); 3989 if (S->getFnParent() != 0) { 3990 switch (SC) { 3991 case SC_None: 3992 case SC_Auto: 3993 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3994 break; 3995 case SC_Register: 3996 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3997 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3998 break; 3999 case SC_Static: 4000 case SC_Extern: 4001 case SC_PrivateExtern: 4002 case SC_OpenCLWorkGroupLocal: 4003 break; 4004 } 4005 } 4006 4007 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4008 Context, Label)); 4009 } 4010 4011 // Diagnose shadowed variables before filtering for scope. 4012 if (!D.getCXXScopeSpec().isSet()) 4013 CheckShadow(S, NewVD, Previous); 4014 4015 // Don't consider existing declarations that are in a different 4016 // scope and are out-of-semantic-context declarations (if the new 4017 // declaration has linkage). 4018 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4019 isExplicitSpecialization); 4020 4021 if (!getLangOptions().CPlusPlus) { 4022 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4023 } else { 4024 // Merge the decl with the existing one if appropriate. 4025 if (!Previous.empty()) { 4026 if (Previous.isSingleResult() && 4027 isa<FieldDecl>(Previous.getFoundDecl()) && 4028 D.getCXXScopeSpec().isSet()) { 4029 // The user tried to define a non-static data member 4030 // out-of-line (C++ [dcl.meaning]p1). 4031 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4032 << D.getCXXScopeSpec().getRange(); 4033 Previous.clear(); 4034 NewVD->setInvalidDecl(); 4035 } 4036 } else if (D.getCXXScopeSpec().isSet()) { 4037 // No previous declaration in the qualifying scope. 4038 Diag(D.getIdentifierLoc(), diag::err_no_member) 4039 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4040 << D.getCXXScopeSpec().getRange(); 4041 NewVD->setInvalidDecl(); 4042 } 4043 4044 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4045 4046 // This is an explicit specialization of a static data member. Check it. 4047 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4048 CheckMemberSpecialization(NewVD, Previous)) 4049 NewVD->setInvalidDecl(); 4050 } 4051 4052 // attributes declared post-definition are currently ignored 4053 // FIXME: This should be handled in attribute merging, not 4054 // here. 4055 if (Previous.isSingleResult()) { 4056 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4057 if (Def && (Def = Def->getDefinition()) && 4058 Def != NewVD && D.hasAttributes()) { 4059 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4060 Diag(Def->getLocation(), diag::note_previous_definition); 4061 } 4062 } 4063 4064 // If this is a locally-scoped extern C variable, update the map of 4065 // such variables. 4066 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4067 !NewVD->isInvalidDecl()) 4068 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4069 4070 // If there's a #pragma GCC visibility in scope, and this isn't a class 4071 // member, set the visibility of this variable. 4072 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4073 AddPushedVisibilityAttribute(NewVD); 4074 4075 MarkUnusedFileScopedDecl(NewVD); 4076 4077 return NewVD; 4078} 4079 4080/// \brief Diagnose variable or built-in function shadowing. Implements 4081/// -Wshadow. 4082/// 4083/// This method is called whenever a VarDecl is added to a "useful" 4084/// scope. 4085/// 4086/// \param S the scope in which the shadowing name is being declared 4087/// \param R the lookup of the name 4088/// 4089void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4090 // Return if warning is ignored. 4091 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4092 DiagnosticsEngine::Ignored) 4093 return; 4094 4095 // Don't diagnose declarations at file scope. 4096 if (D->hasGlobalStorage()) 4097 return; 4098 4099 DeclContext *NewDC = D->getDeclContext(); 4100 4101 // Only diagnose if we're shadowing an unambiguous field or variable. 4102 if (R.getResultKind() != LookupResult::Found) 4103 return; 4104 4105 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4106 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4107 return; 4108 4109 // Fields are not shadowed by variables in C++ static methods. 4110 if (isa<FieldDecl>(ShadowedDecl)) 4111 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4112 if (MD->isStatic()) 4113 return; 4114 4115 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4116 if (shadowedVar->isExternC()) { 4117 // For shadowing external vars, make sure that we point to the global 4118 // declaration, not a locally scoped extern declaration. 4119 for (VarDecl::redecl_iterator 4120 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4121 I != E; ++I) 4122 if (I->isFileVarDecl()) { 4123 ShadowedDecl = *I; 4124 break; 4125 } 4126 } 4127 4128 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4129 4130 // Only warn about certain kinds of shadowing for class members. 4131 if (NewDC && NewDC->isRecord()) { 4132 // In particular, don't warn about shadowing non-class members. 4133 if (!OldDC->isRecord()) 4134 return; 4135 4136 // TODO: should we warn about static data members shadowing 4137 // static data members from base classes? 4138 4139 // TODO: don't diagnose for inaccessible shadowed members. 4140 // This is hard to do perfectly because we might friend the 4141 // shadowing context, but that's just a false negative. 4142 } 4143 4144 // Determine what kind of declaration we're shadowing. 4145 unsigned Kind; 4146 if (isa<RecordDecl>(OldDC)) { 4147 if (isa<FieldDecl>(ShadowedDecl)) 4148 Kind = 3; // field 4149 else 4150 Kind = 2; // static data member 4151 } else if (OldDC->isFileContext()) 4152 Kind = 1; // global 4153 else 4154 Kind = 0; // local 4155 4156 DeclarationName Name = R.getLookupName(); 4157 4158 // Emit warning and note. 4159 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4160 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4161} 4162 4163/// \brief Check -Wshadow without the advantage of a previous lookup. 4164void Sema::CheckShadow(Scope *S, VarDecl *D) { 4165 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4166 DiagnosticsEngine::Ignored) 4167 return; 4168 4169 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4170 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4171 LookupName(R, S); 4172 CheckShadow(S, D, R); 4173} 4174 4175/// \brief Perform semantic checking on a newly-created variable 4176/// declaration. 4177/// 4178/// This routine performs all of the type-checking required for a 4179/// variable declaration once it has been built. It is used both to 4180/// check variables after they have been parsed and their declarators 4181/// have been translated into a declaration, and to check variables 4182/// that have been instantiated from a template. 4183/// 4184/// Sets NewVD->isInvalidDecl() if an error was encountered. 4185/// 4186/// Returns true if the variable declaration is a redeclaration. 4187bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4188 LookupResult &Previous) { 4189 // If the decl is already known invalid, don't check it. 4190 if (NewVD->isInvalidDecl()) 4191 return false; 4192 4193 QualType T = NewVD->getType(); 4194 4195 if (T->isObjCObjectType()) { 4196 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4197 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4198 T = Context.getObjCObjectPointerType(T); 4199 NewVD->setType(T); 4200 } 4201 4202 // Emit an error if an address space was applied to decl with local storage. 4203 // This includes arrays of objects with address space qualifiers, but not 4204 // automatic variables that point to other address spaces. 4205 // ISO/IEC TR 18037 S5.1.2 4206 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4207 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4208 NewVD->setInvalidDecl(); 4209 return false; 4210 } 4211 4212 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4213 && !NewVD->hasAttr<BlocksAttr>()) { 4214 if (getLangOptions().getGC() != LangOptions::NonGC) 4215 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4216 else 4217 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4218 } 4219 4220 bool isVM = T->isVariablyModifiedType(); 4221 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4222 NewVD->hasAttr<BlocksAttr>()) 4223 getCurFunction()->setHasBranchProtectedScope(); 4224 4225 if ((isVM && NewVD->hasLinkage()) || 4226 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4227 bool SizeIsNegative; 4228 llvm::APSInt Oversized; 4229 QualType FixedTy = 4230 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4231 Oversized); 4232 4233 if (FixedTy.isNull() && T->isVariableArrayType()) { 4234 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4235 // FIXME: This won't give the correct result for 4236 // int a[10][n]; 4237 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4238 4239 if (NewVD->isFileVarDecl()) 4240 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4241 << SizeRange; 4242 else if (NewVD->getStorageClass() == SC_Static) 4243 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4244 << SizeRange; 4245 else 4246 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4247 << SizeRange; 4248 NewVD->setInvalidDecl(); 4249 return false; 4250 } 4251 4252 if (FixedTy.isNull()) { 4253 if (NewVD->isFileVarDecl()) 4254 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4255 else 4256 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4257 NewVD->setInvalidDecl(); 4258 return false; 4259 } 4260 4261 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4262 NewVD->setType(FixedTy); 4263 } 4264 4265 if (Previous.empty() && NewVD->isExternC()) { 4266 // Since we did not find anything by this name and we're declaring 4267 // an extern "C" variable, look for a non-visible extern "C" 4268 // declaration with the same name. 4269 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4270 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4271 if (Pos != LocallyScopedExternalDecls.end()) 4272 Previous.addDecl(Pos->second); 4273 } 4274 4275 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4276 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4277 << T; 4278 NewVD->setInvalidDecl(); 4279 return false; 4280 } 4281 4282 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4283 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4284 NewVD->setInvalidDecl(); 4285 return false; 4286 } 4287 4288 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4289 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4290 NewVD->setInvalidDecl(); 4291 return false; 4292 } 4293 4294 // Function pointers and references cannot have qualified function type, only 4295 // function pointer-to-members can do that. 4296 QualType Pointee; 4297 unsigned PtrOrRef = 0; 4298 if (const PointerType *Ptr = T->getAs<PointerType>()) 4299 Pointee = Ptr->getPointeeType(); 4300 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4301 Pointee = Ref->getPointeeType(); 4302 PtrOrRef = 1; 4303 } 4304 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4305 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4306 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4307 << PtrOrRef; 4308 NewVD->setInvalidDecl(); 4309 return false; 4310 } 4311 4312 if (!Previous.empty()) { 4313 MergeVarDecl(NewVD, Previous); 4314 return true; 4315 } 4316 return false; 4317} 4318 4319/// \brief Data used with FindOverriddenMethod 4320struct FindOverriddenMethodData { 4321 Sema *S; 4322 CXXMethodDecl *Method; 4323}; 4324 4325/// \brief Member lookup function that determines whether a given C++ 4326/// method overrides a method in a base class, to be used with 4327/// CXXRecordDecl::lookupInBases(). 4328static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4329 CXXBasePath &Path, 4330 void *UserData) { 4331 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4332 4333 FindOverriddenMethodData *Data 4334 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4335 4336 DeclarationName Name = Data->Method->getDeclName(); 4337 4338 // FIXME: Do we care about other names here too? 4339 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4340 // We really want to find the base class destructor here. 4341 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4342 CanQualType CT = Data->S->Context.getCanonicalType(T); 4343 4344 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4345 } 4346 4347 for (Path.Decls = BaseRecord->lookup(Name); 4348 Path.Decls.first != Path.Decls.second; 4349 ++Path.Decls.first) { 4350 NamedDecl *D = *Path.Decls.first; 4351 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4352 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4353 return true; 4354 } 4355 } 4356 4357 return false; 4358} 4359 4360/// AddOverriddenMethods - See if a method overrides any in the base classes, 4361/// and if so, check that it's a valid override and remember it. 4362bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4363 // Look for virtual methods in base classes that this method might override. 4364 CXXBasePaths Paths; 4365 FindOverriddenMethodData Data; 4366 Data.Method = MD; 4367 Data.S = this; 4368 bool AddedAny = false; 4369 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4370 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4371 E = Paths.found_decls_end(); I != E; ++I) { 4372 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4373 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4374 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4375 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4376 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4377 AddedAny = true; 4378 } 4379 } 4380 } 4381 } 4382 4383 return AddedAny; 4384} 4385 4386namespace { 4387 // Struct for holding all of the extra arguments needed by 4388 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4389 struct ActOnFDArgs { 4390 Scope *S; 4391 Declarator &D; 4392 MultiTemplateParamsArg TemplateParamLists; 4393 bool AddToScope; 4394 }; 4395} 4396 4397/// \brief Generate diagnostics for an invalid function redeclaration. 4398/// 4399/// This routine handles generating the diagnostic messages for an invalid 4400/// function redeclaration, including finding possible similar declarations 4401/// or performing typo correction if there are no previous declarations with 4402/// the same name. 4403/// 4404/// Returns a NamedDecl iff typo correction was performed and substituting in 4405/// the new declaration name does not cause new errors. 4406static NamedDecl* DiagnoseInvalidRedeclaration( 4407 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4408 ActOnFDArgs &ExtraArgs) { 4409 NamedDecl *Result = NULL; 4410 DeclarationName Name = NewFD->getDeclName(); 4411 DeclContext *NewDC = NewFD->getDeclContext(); 4412 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4413 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4414 llvm::SmallVector<unsigned, 1> MismatchedParams; 4415 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4416 TypoCorrection Correction; 4417 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4418 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4419 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4420 : diag::err_member_def_does_not_match; 4421 4422 NewFD->setInvalidDecl(); 4423 SemaRef.LookupQualifiedName(Prev, NewDC); 4424 assert(!Prev.isAmbiguous() && 4425 "Cannot have an ambiguity in previous-declaration lookup"); 4426 if (!Prev.empty()) { 4427 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4428 Func != FuncEnd; ++Func) { 4429 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4430 if (FD && 4431 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4432 // Add 1 to the index so that 0 can mean the mismatch didn't 4433 // involve a parameter 4434 unsigned ParamNum = 4435 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4436 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4437 } 4438 } 4439 // If the qualified name lookup yielded nothing, try typo correction 4440 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4441 Prev.getLookupKind(), 0, 0, NewDC)) && 4442 Correction.getCorrection() != Name) { 4443 // Trap errors. 4444 Sema::SFINAETrap Trap(SemaRef); 4445 4446 // Set up everything for the call to ActOnFunctionDeclarator 4447 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4448 ExtraArgs.D.getIdentifierLoc()); 4449 Previous.clear(); 4450 Previous.setLookupName(Correction.getCorrection()); 4451 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4452 CDeclEnd = Correction.end(); 4453 CDecl != CDeclEnd; ++CDecl) { 4454 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4455 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4456 MismatchedParams)) { 4457 Previous.addDecl(FD); 4458 } 4459 } 4460 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4461 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4462 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4463 // eliminate the need for the parameter pack ExtraArgs. 4464 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4465 NewFD->getDeclContext(), 4466 NewFD->getTypeSourceInfo(), 4467 Previous, 4468 ExtraArgs.TemplateParamLists, 4469 ExtraArgs.AddToScope); 4470 if (Trap.hasErrorOccurred()) { 4471 // Pretend the typo correction never occurred 4472 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4473 ExtraArgs.D.getIdentifierLoc()); 4474 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4475 Previous.clear(); 4476 Previous.setLookupName(Name); 4477 Result = NULL; 4478 } else { 4479 for (LookupResult::iterator Func = Previous.begin(), 4480 FuncEnd = Previous.end(); 4481 Func != FuncEnd; ++Func) { 4482 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4483 NearMatches.push_back(std::make_pair(FD, 0)); 4484 } 4485 } 4486 if (NearMatches.empty()) { 4487 // Ignore the correction if it didn't yield any close FunctionDecl matches 4488 Correction = TypoCorrection(); 4489 } else { 4490 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4491 : diag::err_member_def_does_not_match_suggest; 4492 } 4493 } 4494 4495 if (Correction) 4496 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4497 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4498 << FixItHint::CreateReplacement( 4499 NewFD->getLocation(), 4500 Correction.getAsString(SemaRef.getLangOptions())); 4501 else 4502 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4503 << Name << NewDC << NewFD->getLocation(); 4504 4505 bool NewFDisConst = false; 4506 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4507 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4508 4509 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4510 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4511 NearMatch != NearMatchEnd; ++NearMatch) { 4512 FunctionDecl *FD = NearMatch->first; 4513 bool FDisConst = false; 4514 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4515 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4516 4517 if (unsigned Idx = NearMatch->second) { 4518 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4519 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4520 diag::note_member_def_close_param_match) 4521 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4522 } else if (Correction) { 4523 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4524 << Correction.getQuoted(SemaRef.getLangOptions()); 4525 } else if (FDisConst != NewFDisConst) { 4526 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4527 << NewFDisConst << FD->getSourceRange().getEnd(); 4528 } else 4529 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4530 } 4531 return Result; 4532} 4533 4534static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4535 Declarator &D) { 4536 switch (D.getDeclSpec().getStorageClassSpec()) { 4537 default: llvm_unreachable("Unknown storage class!"); 4538 case DeclSpec::SCS_auto: 4539 case DeclSpec::SCS_register: 4540 case DeclSpec::SCS_mutable: 4541 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4542 diag::err_typecheck_sclass_func); 4543 D.setInvalidType(); 4544 break; 4545 case DeclSpec::SCS_unspecified: break; 4546 case DeclSpec::SCS_extern: return SC_Extern; 4547 case DeclSpec::SCS_static: { 4548 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4549 // C99 6.7.1p5: 4550 // The declaration of an identifier for a function that has 4551 // block scope shall have no explicit storage-class specifier 4552 // other than extern 4553 // See also (C++ [dcl.stc]p4). 4554 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4555 diag::err_static_block_func); 4556 break; 4557 } else 4558 return SC_Static; 4559 } 4560 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4561 } 4562 4563 // No explicit storage class has already been returned 4564 return SC_None; 4565} 4566 4567static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4568 DeclContext *DC, QualType &R, 4569 TypeSourceInfo *TInfo, 4570 FunctionDecl::StorageClass SC, 4571 bool &IsVirtualOkay) { 4572 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4573 DeclarationName Name = NameInfo.getName(); 4574 4575 FunctionDecl *NewFD = 0; 4576 bool isInline = D.getDeclSpec().isInlineSpecified(); 4577 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4578 FunctionDecl::StorageClass SCAsWritten 4579 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4580 4581 if (!SemaRef.getLangOptions().CPlusPlus) { 4582 // Determine whether the function was written with a 4583 // prototype. This true when: 4584 // - there is a prototype in the declarator, or 4585 // - the type R of the function is some kind of typedef or other reference 4586 // to a type name (which eventually refers to a function type). 4587 bool HasPrototype = 4588 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4589 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4590 4591 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4592 D.getSourceRange().getBegin(), NameInfo, R, 4593 TInfo, SC, SCAsWritten, isInline, 4594 HasPrototype); 4595 if (D.isInvalidType()) 4596 NewFD->setInvalidDecl(); 4597 4598 // Set the lexical context. 4599 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4600 4601 return NewFD; 4602 } 4603 4604 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4605 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4606 4607 // Check that the return type is not an abstract class type. 4608 // For record types, this is done by the AbstractClassUsageDiagnoser once 4609 // the class has been completely parsed. 4610 if (!DC->isRecord() && 4611 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4612 R->getAs<FunctionType>()->getResultType(), 4613 diag::err_abstract_type_in_decl, 4614 SemaRef.AbstractReturnType)) 4615 D.setInvalidType(); 4616 4617 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4618 // This is a C++ constructor declaration. 4619 assert(DC->isRecord() && 4620 "Constructors can only be declared in a member context"); 4621 4622 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4623 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4624 D.getSourceRange().getBegin(), NameInfo, 4625 R, TInfo, isExplicit, isInline, 4626 /*isImplicitlyDeclared=*/false, 4627 isConstexpr); 4628 4629 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4630 // This is a C++ destructor declaration. 4631 if (DC->isRecord()) { 4632 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4633 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4634 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4635 SemaRef.Context, Record, 4636 D.getSourceRange().getBegin(), 4637 NameInfo, R, TInfo, isInline, 4638 /*isImplicitlyDeclared=*/false); 4639 4640 // If the class is complete, then we now create the implicit exception 4641 // specification. If the class is incomplete or dependent, we can't do 4642 // it yet. 4643 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4644 Record->getDefinition() && !Record->isBeingDefined() && 4645 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4646 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4647 } 4648 4649 IsVirtualOkay = true; 4650 return NewDD; 4651 4652 } else { 4653 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4654 D.setInvalidType(); 4655 4656 // Create a FunctionDecl to satisfy the function definition parsing 4657 // code path. 4658 return FunctionDecl::Create(SemaRef.Context, DC, 4659 D.getSourceRange().getBegin(), 4660 D.getIdentifierLoc(), Name, R, TInfo, 4661 SC, SCAsWritten, isInline, 4662 /*hasPrototype=*/true, isConstexpr); 4663 } 4664 4665 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4666 if (!DC->isRecord()) { 4667 SemaRef.Diag(D.getIdentifierLoc(), 4668 diag::err_conv_function_not_member); 4669 return 0; 4670 } 4671 4672 SemaRef.CheckConversionDeclarator(D, R, SC); 4673 IsVirtualOkay = true; 4674 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4675 D.getSourceRange().getBegin(), NameInfo, 4676 R, TInfo, isInline, isExplicit, 4677 isConstexpr, SourceLocation()); 4678 4679 } else if (DC->isRecord()) { 4680 // If the name of the function is the same as the name of the record, 4681 // then this must be an invalid constructor that has a return type. 4682 // (The parser checks for a return type and makes the declarator a 4683 // constructor if it has no return type). 4684 if (Name.getAsIdentifierInfo() && 4685 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4686 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4687 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4688 << SourceRange(D.getIdentifierLoc()); 4689 return 0; 4690 } 4691 4692 bool isStatic = SC == SC_Static; 4693 4694 // [class.free]p1: 4695 // Any allocation function for a class T is a static member 4696 // (even if not explicitly declared static). 4697 if (Name.getCXXOverloadedOperator() == OO_New || 4698 Name.getCXXOverloadedOperator() == OO_Array_New) 4699 isStatic = true; 4700 4701 // [class.free]p6 Any deallocation function for a class X is a static member 4702 // (even if not explicitly declared static). 4703 if (Name.getCXXOverloadedOperator() == OO_Delete || 4704 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4705 isStatic = true; 4706 4707 IsVirtualOkay = !isStatic; 4708 4709 // This is a C++ method declaration. 4710 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4711 D.getSourceRange().getBegin(), NameInfo, R, 4712 TInfo, isStatic, SCAsWritten, isInline, 4713 isConstexpr, SourceLocation()); 4714 4715 } else { 4716 // Determine whether the function was written with a 4717 // prototype. This true when: 4718 // - we're in C++ (where every function has a prototype), 4719 return FunctionDecl::Create(SemaRef.Context, DC, 4720 D.getSourceRange().getBegin(), 4721 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4722 true/*HasPrototype*/, isConstexpr); 4723 } 4724} 4725 4726NamedDecl* 4727Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4728 TypeSourceInfo *TInfo, LookupResult &Previous, 4729 MultiTemplateParamsArg TemplateParamLists, 4730 bool &AddToScope) { 4731 QualType R = TInfo->getType(); 4732 4733 assert(R.getTypePtr()->isFunctionType()); 4734 4735 // TODO: consider using NameInfo for diagnostic. 4736 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4737 DeclarationName Name = NameInfo.getName(); 4738 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4739 4740 if (D.getDeclSpec().isThreadSpecified()) 4741 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4742 4743 // Do not allow returning a objc interface by-value. 4744 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4745 Diag(D.getIdentifierLoc(), 4746 diag::err_object_cannot_be_passed_returned_by_value) << 0 4747 << R->getAs<FunctionType>()->getResultType() 4748 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4749 4750 QualType T = R->getAs<FunctionType>()->getResultType(); 4751 T = Context.getObjCObjectPointerType(T); 4752 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4753 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4754 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4755 FPT->getNumArgs(), EPI); 4756 } 4757 else if (isa<FunctionNoProtoType>(R)) 4758 R = Context.getFunctionNoProtoType(T); 4759 } 4760 4761 bool isFriend = false; 4762 FunctionTemplateDecl *FunctionTemplate = 0; 4763 bool isExplicitSpecialization = false; 4764 bool isFunctionTemplateSpecialization = false; 4765 bool isDependentClassScopeExplicitSpecialization = false; 4766 bool isVirtualOkay = false; 4767 4768 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4769 isVirtualOkay); 4770 if (!NewFD) return 0; 4771 4772 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4773 NewFD->setTopLevelDeclInObjCContainer(); 4774 4775 if (getLangOptions().CPlusPlus) { 4776 bool isInline = D.getDeclSpec().isInlineSpecified(); 4777 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4778 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4779 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4780 isFriend = D.getDeclSpec().isFriendSpecified(); 4781 if (isFriend && !isInline && D.isFunctionDefinition()) { 4782 // C++ [class.friend]p5 4783 // A function can be defined in a friend declaration of a 4784 // class . . . . Such a function is implicitly inline. 4785 NewFD->setImplicitlyInline(); 4786 } 4787 4788 SetNestedNameSpecifier(NewFD, D); 4789 isExplicitSpecialization = false; 4790 isFunctionTemplateSpecialization = false; 4791 if (D.isInvalidType()) 4792 NewFD->setInvalidDecl(); 4793 4794 // Set the lexical context. If the declarator has a C++ 4795 // scope specifier, or is the object of a friend declaration, the 4796 // lexical context will be different from the semantic context. 4797 NewFD->setLexicalDeclContext(CurContext); 4798 4799 // Match up the template parameter lists with the scope specifier, then 4800 // determine whether we have a template or a template specialization. 4801 bool Invalid = false; 4802 if (TemplateParameterList *TemplateParams 4803 = MatchTemplateParametersToScopeSpecifier( 4804 D.getDeclSpec().getSourceRange().getBegin(), 4805 D.getIdentifierLoc(), 4806 D.getCXXScopeSpec(), 4807 TemplateParamLists.get(), 4808 TemplateParamLists.size(), 4809 isFriend, 4810 isExplicitSpecialization, 4811 Invalid)) { 4812 if (TemplateParams->size() > 0) { 4813 // This is a function template 4814 4815 // Check that we can declare a template here. 4816 if (CheckTemplateDeclScope(S, TemplateParams)) 4817 return 0; 4818 4819 // A destructor cannot be a template. 4820 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4821 Diag(NewFD->getLocation(), diag::err_destructor_template); 4822 return 0; 4823 } 4824 4825 // If we're adding a template to a dependent context, we may need to 4826 // rebuilding some of the types used within the template parameter list, 4827 // now that we know what the current instantiation is. 4828 if (DC->isDependentContext()) { 4829 ContextRAII SavedContext(*this, DC); 4830 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4831 Invalid = true; 4832 } 4833 4834 4835 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4836 NewFD->getLocation(), 4837 Name, TemplateParams, 4838 NewFD); 4839 FunctionTemplate->setLexicalDeclContext(CurContext); 4840 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4841 4842 // For source fidelity, store the other template param lists. 4843 if (TemplateParamLists.size() > 1) { 4844 NewFD->setTemplateParameterListsInfo(Context, 4845 TemplateParamLists.size() - 1, 4846 TemplateParamLists.release()); 4847 } 4848 } else { 4849 // This is a function template specialization. 4850 isFunctionTemplateSpecialization = true; 4851 // For source fidelity, store all the template param lists. 4852 NewFD->setTemplateParameterListsInfo(Context, 4853 TemplateParamLists.size(), 4854 TemplateParamLists.release()); 4855 4856 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4857 if (isFriend) { 4858 // We want to remove the "template<>", found here. 4859 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4860 4861 // If we remove the template<> and the name is not a 4862 // template-id, we're actually silently creating a problem: 4863 // the friend declaration will refer to an untemplated decl, 4864 // and clearly the user wants a template specialization. So 4865 // we need to insert '<>' after the name. 4866 SourceLocation InsertLoc; 4867 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4868 InsertLoc = D.getName().getSourceRange().getEnd(); 4869 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4870 } 4871 4872 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4873 << Name << RemoveRange 4874 << FixItHint::CreateRemoval(RemoveRange) 4875 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4876 } 4877 } 4878 } 4879 else { 4880 // All template param lists were matched against the scope specifier: 4881 // this is NOT (an explicit specialization of) a template. 4882 if (TemplateParamLists.size() > 0) 4883 // For source fidelity, store all the template param lists. 4884 NewFD->setTemplateParameterListsInfo(Context, 4885 TemplateParamLists.size(), 4886 TemplateParamLists.release()); 4887 } 4888 4889 if (Invalid) { 4890 NewFD->setInvalidDecl(); 4891 if (FunctionTemplate) 4892 FunctionTemplate->setInvalidDecl(); 4893 } 4894 4895 // If we see "T var();" at block scope, where T is a class type, it is 4896 // probably an attempt to initialize a variable, not a function declaration. 4897 // We don't catch this case earlier, since there is no ambiguity here. 4898 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4899 CurContext->isFunctionOrMethod() && 4900 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4901 D.getDeclSpec().getStorageClassSpecAsWritten() 4902 == DeclSpec::SCS_unspecified) { 4903 QualType T = R->getAs<FunctionType>()->getResultType(); 4904 DeclaratorChunk &C = D.getTypeObject(0); 4905 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4906 !C.Fun.TrailingReturnType && 4907 C.Fun.getExceptionSpecType() == EST_None) { 4908 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) 4909 << SourceRange(C.Loc, C.EndLoc); 4910 } 4911 } 4912 4913 // C++ [dcl.fct.spec]p5: 4914 // The virtual specifier shall only be used in declarations of 4915 // nonstatic class member functions that appear within a 4916 // member-specification of a class declaration; see 10.3. 4917 // 4918 if (isVirtual && !NewFD->isInvalidDecl()) { 4919 if (!isVirtualOkay) { 4920 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4921 diag::err_virtual_non_function); 4922 } else if (!CurContext->isRecord()) { 4923 // 'virtual' was specified outside of the class. 4924 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4925 diag::err_virtual_out_of_class) 4926 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4927 } else if (NewFD->getDescribedFunctionTemplate()) { 4928 // C++ [temp.mem]p3: 4929 // A member function template shall not be virtual. 4930 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4931 diag::err_virtual_member_function_template) 4932 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4933 } else { 4934 // Okay: Add virtual to the method. 4935 NewFD->setVirtualAsWritten(true); 4936 } 4937 } 4938 4939 // C++ [dcl.fct.spec]p3: 4940 // The inline specifier shall not appear on a block scope function 4941 // declaration. 4942 if (isInline && !NewFD->isInvalidDecl()) { 4943 if (CurContext->isFunctionOrMethod()) { 4944 // 'inline' is not allowed on block scope function declaration. 4945 Diag(D.getDeclSpec().getInlineSpecLoc(), 4946 diag::err_inline_declaration_block_scope) << Name 4947 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4948 } 4949 } 4950 4951 // C++ [dcl.fct.spec]p6: 4952 // The explicit specifier shall be used only in the declaration of a 4953 // constructor or conversion function within its class definition; 4954 // see 12.3.1 and 12.3.2. 4955 if (isExplicit && !NewFD->isInvalidDecl()) { 4956 if (!CurContext->isRecord()) { 4957 // 'explicit' was specified outside of the class. 4958 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4959 diag::err_explicit_out_of_class) 4960 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4961 } else if (!isa<CXXConstructorDecl>(NewFD) && 4962 !isa<CXXConversionDecl>(NewFD)) { 4963 // 'explicit' was specified on a function that wasn't a constructor 4964 // or conversion function. 4965 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4966 diag::err_explicit_non_ctor_or_conv_function) 4967 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4968 } 4969 } 4970 4971 if (isConstexpr) { 4972 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4973 // are implicitly inline. 4974 NewFD->setImplicitlyInline(); 4975 4976 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4977 // be either constructors or to return a literal type. Therefore, 4978 // destructors cannot be declared constexpr. 4979 if (isa<CXXDestructorDecl>(NewFD)) 4980 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4981 } 4982 4983 // If __module_private__ was specified, mark the function accordingly. 4984 if (D.getDeclSpec().isModulePrivateSpecified()) { 4985 if (isFunctionTemplateSpecialization) { 4986 SourceLocation ModulePrivateLoc 4987 = D.getDeclSpec().getModulePrivateSpecLoc(); 4988 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4989 << 0 4990 << FixItHint::CreateRemoval(ModulePrivateLoc); 4991 } else { 4992 NewFD->setModulePrivate(); 4993 if (FunctionTemplate) 4994 FunctionTemplate->setModulePrivate(); 4995 } 4996 } 4997 4998 if (isFriend) { 4999 // For now, claim that the objects have no previous declaration. 5000 if (FunctionTemplate) { 5001 FunctionTemplate->setObjectOfFriendDecl(false); 5002 FunctionTemplate->setAccess(AS_public); 5003 } 5004 NewFD->setObjectOfFriendDecl(false); 5005 NewFD->setAccess(AS_public); 5006 } 5007 5008 // If a function is defined as defaulted or deleted, mark it as such now. 5009 switch (D.getFunctionDefinitionKind()) { 5010 case FDK_Declaration: 5011 case FDK_Definition: 5012 break; 5013 5014 case FDK_Defaulted: 5015 NewFD->setDefaulted(); 5016 break; 5017 5018 case FDK_Deleted: 5019 NewFD->setDeletedAsWritten(); 5020 break; 5021 } 5022 5023 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5024 D.isFunctionDefinition()) { 5025 // C++ [class.mfct]p2: 5026 // A member function may be defined (8.4) in its class definition, in 5027 // which case it is an inline member function (7.1.2) 5028 NewFD->setImplicitlyInline(); 5029 } 5030 5031 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5032 !CurContext->isRecord()) { 5033 // C++ [class.static]p1: 5034 // A data or function member of a class may be declared static 5035 // in a class definition, in which case it is a static member of 5036 // the class. 5037 5038 // Complain about the 'static' specifier if it's on an out-of-line 5039 // member function definition. 5040 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5041 diag::err_static_out_of_line) 5042 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5043 } 5044 } 5045 5046 // Filter out previous declarations that don't match the scope. 5047 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5048 isExplicitSpecialization || 5049 isFunctionTemplateSpecialization); 5050 5051 // Handle GNU asm-label extension (encoded as an attribute). 5052 if (Expr *E = (Expr*) D.getAsmLabel()) { 5053 // The parser guarantees this is a string. 5054 StringLiteral *SE = cast<StringLiteral>(E); 5055 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5056 SE->getString())); 5057 } 5058 5059 // Copy the parameter declarations from the declarator D to the function 5060 // declaration NewFD, if they are available. First scavenge them into Params. 5061 SmallVector<ParmVarDecl*, 16> Params; 5062 if (D.isFunctionDeclarator()) { 5063 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5064 5065 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5066 // function that takes no arguments, not a function that takes a 5067 // single void argument. 5068 // We let through "const void" here because Sema::GetTypeForDeclarator 5069 // already checks for that case. 5070 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5071 FTI.ArgInfo[0].Param && 5072 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5073 // Empty arg list, don't push any params. 5074 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5075 5076 // In C++, the empty parameter-type-list must be spelled "void"; a 5077 // typedef of void is not permitted. 5078 if (getLangOptions().CPlusPlus && 5079 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5080 bool IsTypeAlias = false; 5081 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5082 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5083 else if (const TemplateSpecializationType *TST = 5084 Param->getType()->getAs<TemplateSpecializationType>()) 5085 IsTypeAlias = TST->isTypeAlias(); 5086 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5087 << IsTypeAlias; 5088 } 5089 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5090 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5091 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5092 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5093 Param->setDeclContext(NewFD); 5094 Params.push_back(Param); 5095 5096 if (Param->isInvalidDecl()) 5097 NewFD->setInvalidDecl(); 5098 } 5099 } 5100 5101 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5102 // When we're declaring a function with a typedef, typeof, etc as in the 5103 // following example, we'll need to synthesize (unnamed) 5104 // parameters for use in the declaration. 5105 // 5106 // @code 5107 // typedef void fn(int); 5108 // fn f; 5109 // @endcode 5110 5111 // Synthesize a parameter for each argument type. 5112 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5113 AE = FT->arg_type_end(); AI != AE; ++AI) { 5114 ParmVarDecl *Param = 5115 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5116 Param->setScopeInfo(0, Params.size()); 5117 Params.push_back(Param); 5118 } 5119 } else { 5120 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5121 "Should not need args for typedef of non-prototype fn"); 5122 } 5123 5124 // Finally, we know we have the right number of parameters, install them. 5125 NewFD->setParams(Params); 5126 5127 // Process the non-inheritable attributes on this declaration. 5128 ProcessDeclAttributes(S, NewFD, D, 5129 /*NonInheritable=*/true, /*Inheritable=*/false); 5130 5131 if (!getLangOptions().CPlusPlus) { 5132 // Perform semantic checking on the function declaration. 5133 bool isExplicitSpecialization=false; 5134 if (!NewFD->isInvalidDecl()) { 5135 if (NewFD->getResultType()->isVariablyModifiedType()) { 5136 // Functions returning a variably modified type violate C99 6.7.5.2p2 5137 // because all functions have linkage. 5138 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5139 NewFD->setInvalidDecl(); 5140 } else { 5141 if (NewFD->isMain()) 5142 CheckMain(NewFD, D.getDeclSpec()); 5143 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5144 isExplicitSpecialization)); 5145 } 5146 } 5147 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5148 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5149 "previous declaration set still overloaded"); 5150 } else { 5151 // If the declarator is a template-id, translate the parser's template 5152 // argument list into our AST format. 5153 bool HasExplicitTemplateArgs = false; 5154 TemplateArgumentListInfo TemplateArgs; 5155 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5156 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5157 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5158 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5159 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5160 TemplateId->getTemplateArgs(), 5161 TemplateId->NumArgs); 5162 translateTemplateArguments(TemplateArgsPtr, 5163 TemplateArgs); 5164 TemplateArgsPtr.release(); 5165 5166 HasExplicitTemplateArgs = true; 5167 5168 if (NewFD->isInvalidDecl()) { 5169 HasExplicitTemplateArgs = false; 5170 } else if (FunctionTemplate) { 5171 // Function template with explicit template arguments. 5172 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5173 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5174 5175 HasExplicitTemplateArgs = false; 5176 } else if (!isFunctionTemplateSpecialization && 5177 !D.getDeclSpec().isFriendSpecified()) { 5178 // We have encountered something that the user meant to be a 5179 // specialization (because it has explicitly-specified template 5180 // arguments) but that was not introduced with a "template<>" (or had 5181 // too few of them). 5182 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5183 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5184 << FixItHint::CreateInsertion( 5185 D.getDeclSpec().getSourceRange().getBegin(), 5186 "template<> "); 5187 isFunctionTemplateSpecialization = true; 5188 } else { 5189 // "friend void foo<>(int);" is an implicit specialization decl. 5190 isFunctionTemplateSpecialization = true; 5191 } 5192 } else if (isFriend && isFunctionTemplateSpecialization) { 5193 // This combination is only possible in a recovery case; the user 5194 // wrote something like: 5195 // template <> friend void foo(int); 5196 // which we're recovering from as if the user had written: 5197 // friend void foo<>(int); 5198 // Go ahead and fake up a template id. 5199 HasExplicitTemplateArgs = true; 5200 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5201 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5202 } 5203 5204 // If it's a friend (and only if it's a friend), it's possible 5205 // that either the specialized function type or the specialized 5206 // template is dependent, and therefore matching will fail. In 5207 // this case, don't check the specialization yet. 5208 bool InstantiationDependent = false; 5209 if (isFunctionTemplateSpecialization && isFriend && 5210 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5211 TemplateSpecializationType::anyDependentTemplateArguments( 5212 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5213 InstantiationDependent))) { 5214 assert(HasExplicitTemplateArgs && 5215 "friend function specialization without template args"); 5216 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5217 Previous)) 5218 NewFD->setInvalidDecl(); 5219 } else if (isFunctionTemplateSpecialization) { 5220 if (CurContext->isDependentContext() && CurContext->isRecord() 5221 && !isFriend) { 5222 isDependentClassScopeExplicitSpecialization = true; 5223 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5224 diag::ext_function_specialization_in_class : 5225 diag::err_function_specialization_in_class) 5226 << NewFD->getDeclName(); 5227 } else if (CheckFunctionTemplateSpecialization(NewFD, 5228 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5229 Previous)) 5230 NewFD->setInvalidDecl(); 5231 5232 // C++ [dcl.stc]p1: 5233 // A storage-class-specifier shall not be specified in an explicit 5234 // specialization (14.7.3) 5235 if (SC != SC_None) { 5236 if (SC != NewFD->getStorageClass()) 5237 Diag(NewFD->getLocation(), 5238 diag::err_explicit_specialization_inconsistent_storage_class) 5239 << SC 5240 << FixItHint::CreateRemoval( 5241 D.getDeclSpec().getStorageClassSpecLoc()); 5242 5243 else 5244 Diag(NewFD->getLocation(), 5245 diag::ext_explicit_specialization_storage_class) 5246 << FixItHint::CreateRemoval( 5247 D.getDeclSpec().getStorageClassSpecLoc()); 5248 } 5249 5250 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5251 if (CheckMemberSpecialization(NewFD, Previous)) 5252 NewFD->setInvalidDecl(); 5253 } 5254 5255 // Perform semantic checking on the function declaration. 5256 if (!isDependentClassScopeExplicitSpecialization) { 5257 if (NewFD->isInvalidDecl()) { 5258 // If this is a class member, mark the class invalid immediately. 5259 // This avoids some consistency errors later. 5260 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5261 methodDecl->getParent()->setInvalidDecl(); 5262 } else { 5263 if (NewFD->isMain()) 5264 CheckMain(NewFD, D.getDeclSpec()); 5265 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5266 isExplicitSpecialization)); 5267 } 5268 } 5269 5270 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5271 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5272 "previous declaration set still overloaded"); 5273 5274 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5275 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5276 NewFD->setInvalidDecl(); 5277 5278 NamedDecl *PrincipalDecl = (FunctionTemplate 5279 ? cast<NamedDecl>(FunctionTemplate) 5280 : NewFD); 5281 5282 if (isFriend && D.isRedeclaration()) { 5283 AccessSpecifier Access = AS_public; 5284 if (!NewFD->isInvalidDecl()) 5285 Access = NewFD->getPreviousDeclaration()->getAccess(); 5286 5287 NewFD->setAccess(Access); 5288 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5289 5290 PrincipalDecl->setObjectOfFriendDecl(true); 5291 } 5292 5293 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5294 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5295 PrincipalDecl->setNonMemberOperator(); 5296 5297 // If we have a function template, check the template parameter 5298 // list. This will check and merge default template arguments. 5299 if (FunctionTemplate) { 5300 FunctionTemplateDecl *PrevTemplate = 5301 FunctionTemplate->getPreviousDeclaration(); 5302 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5303 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5304 D.getDeclSpec().isFriendSpecified() 5305 ? (D.isFunctionDefinition() 5306 ? TPC_FriendFunctionTemplateDefinition 5307 : TPC_FriendFunctionTemplate) 5308 : (D.getCXXScopeSpec().isSet() && 5309 DC && DC->isRecord() && 5310 DC->isDependentContext()) 5311 ? TPC_ClassTemplateMember 5312 : TPC_FunctionTemplate); 5313 } 5314 5315 if (NewFD->isInvalidDecl()) { 5316 // Ignore all the rest of this. 5317 } else if (!D.isRedeclaration()) { 5318 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5319 AddToScope }; 5320 // Fake up an access specifier if it's supposed to be a class member. 5321 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5322 NewFD->setAccess(AS_public); 5323 5324 // Qualified decls generally require a previous declaration. 5325 if (D.getCXXScopeSpec().isSet()) { 5326 // ...with the major exception of templated-scope or 5327 // dependent-scope friend declarations. 5328 5329 // TODO: we currently also suppress this check in dependent 5330 // contexts because (1) the parameter depth will be off when 5331 // matching friend templates and (2) we might actually be 5332 // selecting a friend based on a dependent factor. But there 5333 // are situations where these conditions don't apply and we 5334 // can actually do this check immediately. 5335 if (isFriend && 5336 (TemplateParamLists.size() || 5337 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5338 CurContext->isDependentContext())) { 5339 // ignore these 5340 } else { 5341 // The user tried to provide an out-of-line definition for a 5342 // function that is a member of a class or namespace, but there 5343 // was no such member function declared (C++ [class.mfct]p2, 5344 // C++ [namespace.memdef]p2). For example: 5345 // 5346 // class X { 5347 // void f() const; 5348 // }; 5349 // 5350 // void X::f() { } // ill-formed 5351 // 5352 // Complain about this problem, and attempt to suggest close 5353 // matches (e.g., those that differ only in cv-qualifiers and 5354 // whether the parameter types are references). 5355 5356 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5357 NewFD, 5358 ExtraArgs)) { 5359 AddToScope = ExtraArgs.AddToScope; 5360 return Result; 5361 } 5362 } 5363 5364 // Unqualified local friend declarations are required to resolve 5365 // to something. 5366 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5367 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5368 NewFD, 5369 ExtraArgs)) { 5370 AddToScope = ExtraArgs.AddToScope; 5371 return Result; 5372 } 5373 } 5374 5375 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5376 !isFriend && !isFunctionTemplateSpecialization && 5377 !isExplicitSpecialization) { 5378 // An out-of-line member function declaration must also be a 5379 // definition (C++ [dcl.meaning]p1). 5380 // Note that this is not the case for explicit specializations of 5381 // function templates or member functions of class templates, per 5382 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5383 // extension for compatibility with old SWIG code which likes to 5384 // generate them. 5385 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5386 << D.getCXXScopeSpec().getRange(); 5387 } 5388 } 5389 5390 5391 // Handle attributes. We need to have merged decls when handling attributes 5392 // (for example to check for conflicts, etc). 5393 // FIXME: This needs to happen before we merge declarations. Then, 5394 // let attribute merging cope with attribute conflicts. 5395 ProcessDeclAttributes(S, NewFD, D, 5396 /*NonInheritable=*/false, /*Inheritable=*/true); 5397 5398 // attributes declared post-definition are currently ignored 5399 // FIXME: This should happen during attribute merging 5400 if (D.isRedeclaration() && Previous.isSingleResult()) { 5401 const FunctionDecl *Def; 5402 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5403 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5404 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5405 Diag(Def->getLocation(), diag::note_previous_definition); 5406 } 5407 } 5408 5409 AddKnownFunctionAttributes(NewFD); 5410 5411 if (NewFD->hasAttr<OverloadableAttr>() && 5412 !NewFD->getType()->getAs<FunctionProtoType>()) { 5413 Diag(NewFD->getLocation(), 5414 diag::err_attribute_overloadable_no_prototype) 5415 << NewFD; 5416 5417 // Turn this into a variadic function with no parameters. 5418 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5419 FunctionProtoType::ExtProtoInfo EPI; 5420 EPI.Variadic = true; 5421 EPI.ExtInfo = FT->getExtInfo(); 5422 5423 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5424 NewFD->setType(R); 5425 } 5426 5427 // If there's a #pragma GCC visibility in scope, and this isn't a class 5428 // member, set the visibility of this function. 5429 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5430 AddPushedVisibilityAttribute(NewFD); 5431 5432 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5433 // marking the function. 5434 AddCFAuditedAttribute(NewFD); 5435 5436 // If this is a locally-scoped extern C function, update the 5437 // map of such names. 5438 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5439 && !NewFD->isInvalidDecl()) 5440 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5441 5442 // Set this FunctionDecl's range up to the right paren. 5443 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5444 5445 if (getLangOptions().CPlusPlus) { 5446 if (FunctionTemplate) { 5447 if (NewFD->isInvalidDecl()) 5448 FunctionTemplate->setInvalidDecl(); 5449 return FunctionTemplate; 5450 } 5451 } 5452 5453 MarkUnusedFileScopedDecl(NewFD); 5454 5455 if (getLangOptions().CUDA) 5456 if (IdentifierInfo *II = NewFD->getIdentifier()) 5457 if (!NewFD->isInvalidDecl() && 5458 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5459 if (II->isStr("cudaConfigureCall")) { 5460 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5461 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5462 5463 Context.setcudaConfigureCallDecl(NewFD); 5464 } 5465 } 5466 5467 // Here we have an function template explicit specialization at class scope. 5468 // The actually specialization will be postponed to template instatiation 5469 // time via the ClassScopeFunctionSpecializationDecl node. 5470 if (isDependentClassScopeExplicitSpecialization) { 5471 ClassScopeFunctionSpecializationDecl *NewSpec = 5472 ClassScopeFunctionSpecializationDecl::Create( 5473 Context, CurContext, SourceLocation(), 5474 cast<CXXMethodDecl>(NewFD)); 5475 CurContext->addDecl(NewSpec); 5476 AddToScope = false; 5477 } 5478 5479 return NewFD; 5480} 5481 5482/// \brief Perform semantic checking of a new function declaration. 5483/// 5484/// Performs semantic analysis of the new function declaration 5485/// NewFD. This routine performs all semantic checking that does not 5486/// require the actual declarator involved in the declaration, and is 5487/// used both for the declaration of functions as they are parsed 5488/// (called via ActOnDeclarator) and for the declaration of functions 5489/// that have been instantiated via C++ template instantiation (called 5490/// via InstantiateDecl). 5491/// 5492/// \param IsExplicitSpecialiation whether this new function declaration is 5493/// an explicit specialization of the previous declaration. 5494/// 5495/// This sets NewFD->isInvalidDecl() to true if there was an error. 5496/// 5497/// Returns true if the function declaration is a redeclaration. 5498bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5499 LookupResult &Previous, 5500 bool IsExplicitSpecialization) { 5501 assert(!NewFD->getResultType()->isVariablyModifiedType() 5502 && "Variably modified return types are not handled here"); 5503 5504 // Check for a previous declaration of this name. 5505 if (Previous.empty() && NewFD->isExternC()) { 5506 // Since we did not find anything by this name and we're declaring 5507 // an extern "C" function, look for a non-visible extern "C" 5508 // declaration with the same name. 5509 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5510 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5511 if (Pos != LocallyScopedExternalDecls.end()) 5512 Previous.addDecl(Pos->second); 5513 } 5514 5515 bool Redeclaration = false; 5516 5517 // Merge or overload the declaration with an existing declaration of 5518 // the same name, if appropriate. 5519 if (!Previous.empty()) { 5520 // Determine whether NewFD is an overload of PrevDecl or 5521 // a declaration that requires merging. If it's an overload, 5522 // there's no more work to do here; we'll just add the new 5523 // function to the scope. 5524 5525 NamedDecl *OldDecl = 0; 5526 if (!AllowOverloadingOfFunction(Previous, Context)) { 5527 Redeclaration = true; 5528 OldDecl = Previous.getFoundDecl(); 5529 } else { 5530 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5531 /*NewIsUsingDecl*/ false)) { 5532 case Ovl_Match: 5533 Redeclaration = true; 5534 break; 5535 5536 case Ovl_NonFunction: 5537 Redeclaration = true; 5538 break; 5539 5540 case Ovl_Overload: 5541 Redeclaration = false; 5542 break; 5543 } 5544 5545 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5546 // If a function name is overloadable in C, then every function 5547 // with that name must be marked "overloadable". 5548 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5549 << Redeclaration << NewFD; 5550 NamedDecl *OverloadedDecl = 0; 5551 if (Redeclaration) 5552 OverloadedDecl = OldDecl; 5553 else if (!Previous.empty()) 5554 OverloadedDecl = Previous.getRepresentativeDecl(); 5555 if (OverloadedDecl) 5556 Diag(OverloadedDecl->getLocation(), 5557 diag::note_attribute_overloadable_prev_overload); 5558 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5559 Context)); 5560 } 5561 } 5562 5563 if (Redeclaration) { 5564 // NewFD and OldDecl represent declarations that need to be 5565 // merged. 5566 if (MergeFunctionDecl(NewFD, OldDecl)) { 5567 NewFD->setInvalidDecl(); 5568 return Redeclaration; 5569 } 5570 5571 Previous.clear(); 5572 Previous.addDecl(OldDecl); 5573 5574 if (FunctionTemplateDecl *OldTemplateDecl 5575 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5576 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5577 FunctionTemplateDecl *NewTemplateDecl 5578 = NewFD->getDescribedFunctionTemplate(); 5579 assert(NewTemplateDecl && "Template/non-template mismatch"); 5580 if (CXXMethodDecl *Method 5581 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5582 Method->setAccess(OldTemplateDecl->getAccess()); 5583 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5584 } 5585 5586 // If this is an explicit specialization of a member that is a function 5587 // template, mark it as a member specialization. 5588 if (IsExplicitSpecialization && 5589 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5590 NewTemplateDecl->setMemberSpecialization(); 5591 assert(OldTemplateDecl->isMemberSpecialization()); 5592 } 5593 5594 } else { 5595 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5596 NewFD->setAccess(OldDecl->getAccess()); 5597 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5598 } 5599 } 5600 } 5601 5602 // Semantic checking for this function declaration (in isolation). 5603 if (getLangOptions().CPlusPlus) { 5604 // C++-specific checks. 5605 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5606 CheckConstructor(Constructor); 5607 } else if (CXXDestructorDecl *Destructor = 5608 dyn_cast<CXXDestructorDecl>(NewFD)) { 5609 CXXRecordDecl *Record = Destructor->getParent(); 5610 QualType ClassType = Context.getTypeDeclType(Record); 5611 5612 // FIXME: Shouldn't we be able to perform this check even when the class 5613 // type is dependent? Both gcc and edg can handle that. 5614 if (!ClassType->isDependentType()) { 5615 DeclarationName Name 5616 = Context.DeclarationNames.getCXXDestructorName( 5617 Context.getCanonicalType(ClassType)); 5618 if (NewFD->getDeclName() != Name) { 5619 Diag(NewFD->getLocation(), diag::err_destructor_name); 5620 NewFD->setInvalidDecl(); 5621 return Redeclaration; 5622 } 5623 } 5624 } else if (CXXConversionDecl *Conversion 5625 = dyn_cast<CXXConversionDecl>(NewFD)) { 5626 ActOnConversionDeclarator(Conversion); 5627 } 5628 5629 // Find any virtual functions that this function overrides. 5630 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5631 if (!Method->isFunctionTemplateSpecialization() && 5632 !Method->getDescribedFunctionTemplate()) { 5633 if (AddOverriddenMethods(Method->getParent(), Method)) { 5634 // If the function was marked as "static", we have a problem. 5635 if (NewFD->getStorageClass() == SC_Static) { 5636 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5637 << NewFD->getDeclName(); 5638 for (CXXMethodDecl::method_iterator 5639 Overridden = Method->begin_overridden_methods(), 5640 OverriddenEnd = Method->end_overridden_methods(); 5641 Overridden != OverriddenEnd; 5642 ++Overridden) { 5643 Diag((*Overridden)->getLocation(), 5644 diag::note_overridden_virtual_function); 5645 } 5646 } 5647 } 5648 } 5649 } 5650 5651 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5652 if (NewFD->isOverloadedOperator() && 5653 CheckOverloadedOperatorDeclaration(NewFD)) { 5654 NewFD->setInvalidDecl(); 5655 return Redeclaration; 5656 } 5657 5658 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5659 if (NewFD->getLiteralIdentifier() && 5660 CheckLiteralOperatorDeclaration(NewFD)) { 5661 NewFD->setInvalidDecl(); 5662 return Redeclaration; 5663 } 5664 5665 // In C++, check default arguments now that we have merged decls. Unless 5666 // the lexical context is the class, because in this case this is done 5667 // during delayed parsing anyway. 5668 if (!CurContext->isRecord()) 5669 CheckCXXDefaultArguments(NewFD); 5670 5671 // If this function declares a builtin function, check the type of this 5672 // declaration against the expected type for the builtin. 5673 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5674 ASTContext::GetBuiltinTypeError Error; 5675 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5676 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5677 // The type of this function differs from the type of the builtin, 5678 // so forget about the builtin entirely. 5679 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5680 } 5681 } 5682 } 5683 return Redeclaration; 5684} 5685 5686void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5687 // C++ [basic.start.main]p3: A program that declares main to be inline 5688 // or static is ill-formed. 5689 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5690 // shall not appear in a declaration of main. 5691 // static main is not an error under C99, but we should warn about it. 5692 if (FD->getStorageClass() == SC_Static) 5693 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5694 ? diag::err_static_main : diag::warn_static_main) 5695 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5696 if (FD->isInlineSpecified()) 5697 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5698 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5699 5700 QualType T = FD->getType(); 5701 assert(T->isFunctionType() && "function decl is not of function type"); 5702 const FunctionType* FT = T->getAs<FunctionType>(); 5703 5704 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5705 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5706 FD->setInvalidDecl(true); 5707 } 5708 5709 // Treat protoless main() as nullary. 5710 if (isa<FunctionNoProtoType>(FT)) return; 5711 5712 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5713 unsigned nparams = FTP->getNumArgs(); 5714 assert(FD->getNumParams() == nparams); 5715 5716 bool HasExtraParameters = (nparams > 3); 5717 5718 // Darwin passes an undocumented fourth argument of type char**. If 5719 // other platforms start sprouting these, the logic below will start 5720 // getting shifty. 5721 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5722 HasExtraParameters = false; 5723 5724 if (HasExtraParameters) { 5725 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5726 FD->setInvalidDecl(true); 5727 nparams = 3; 5728 } 5729 5730 // FIXME: a lot of the following diagnostics would be improved 5731 // if we had some location information about types. 5732 5733 QualType CharPP = 5734 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5735 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5736 5737 for (unsigned i = 0; i < nparams; ++i) { 5738 QualType AT = FTP->getArgType(i); 5739 5740 bool mismatch = true; 5741 5742 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5743 mismatch = false; 5744 else if (Expected[i] == CharPP) { 5745 // As an extension, the following forms are okay: 5746 // char const ** 5747 // char const * const * 5748 // char * const * 5749 5750 QualifierCollector qs; 5751 const PointerType* PT; 5752 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5753 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5754 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5755 qs.removeConst(); 5756 mismatch = !qs.empty(); 5757 } 5758 } 5759 5760 if (mismatch) { 5761 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5762 // TODO: suggest replacing given type with expected type 5763 FD->setInvalidDecl(true); 5764 } 5765 } 5766 5767 if (nparams == 1 && !FD->isInvalidDecl()) { 5768 Diag(FD->getLocation(), diag::warn_main_one_arg); 5769 } 5770 5771 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5772 Diag(FD->getLocation(), diag::err_main_template_decl); 5773 FD->setInvalidDecl(); 5774 } 5775} 5776 5777bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5778 // FIXME: Need strict checking. In C89, we need to check for 5779 // any assignment, increment, decrement, function-calls, or 5780 // commas outside of a sizeof. In C99, it's the same list, 5781 // except that the aforementioned are allowed in unevaluated 5782 // expressions. Everything else falls under the 5783 // "may accept other forms of constant expressions" exception. 5784 // (We never end up here for C++, so the constant expression 5785 // rules there don't matter.) 5786 if (Init->isConstantInitializer(Context, false)) 5787 return false; 5788 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5789 << Init->getSourceRange(); 5790 return true; 5791} 5792 5793namespace { 5794 // Visits an initialization expression to see if OrigDecl is evaluated in 5795 // its own initialization and throws a warning if it does. 5796 class SelfReferenceChecker 5797 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5798 Sema &S; 5799 Decl *OrigDecl; 5800 bool isRecordType; 5801 bool isPODType; 5802 5803 public: 5804 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5805 5806 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5807 S(S), OrigDecl(OrigDecl) { 5808 isPODType = false; 5809 isRecordType = false; 5810 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5811 isPODType = VD->getType().isPODType(S.Context); 5812 isRecordType = VD->getType()->isRecordType(); 5813 } 5814 } 5815 5816 void VisitExpr(Expr *E) { 5817 if (isa<ObjCMessageExpr>(*E)) return; 5818 if (isRecordType) { 5819 Expr *expr = E; 5820 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5821 ValueDecl *VD = ME->getMemberDecl(); 5822 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5823 expr = ME->getBase(); 5824 } 5825 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5826 HandleDeclRefExpr(DRE); 5827 return; 5828 } 5829 } 5830 Inherited::VisitExpr(E); 5831 } 5832 5833 void VisitMemberExpr(MemberExpr *E) { 5834 if (E->getType()->canDecayToPointerType()) return; 5835 if (isa<FieldDecl>(E->getMemberDecl())) 5836 if (DeclRefExpr *DRE 5837 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5838 HandleDeclRefExpr(DRE); 5839 return; 5840 } 5841 Inherited::VisitMemberExpr(E); 5842 } 5843 5844 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5845 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5846 (isRecordType && E->getCastKind() == CK_NoOp)) { 5847 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5848 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5849 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5850 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5851 HandleDeclRefExpr(DRE); 5852 return; 5853 } 5854 } 5855 Inherited::VisitImplicitCastExpr(E); 5856 } 5857 5858 void VisitUnaryOperator(UnaryOperator *E) { 5859 // For POD record types, addresses of its own members are well-defined. 5860 if (isRecordType && isPODType) return; 5861 Inherited::VisitUnaryOperator(E); 5862 } 5863 5864 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5865 Decl* ReferenceDecl = DRE->getDecl(); 5866 if (OrigDecl != ReferenceDecl) return; 5867 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5868 Sema::NotForRedeclaration); 5869 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5870 S.PDiag(diag::warn_uninit_self_reference_in_init) 5871 << Result.getLookupName() 5872 << OrigDecl->getLocation() 5873 << DRE->getSourceRange()); 5874 } 5875 }; 5876} 5877 5878/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5879void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5880 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5881} 5882 5883/// AddInitializerToDecl - Adds the initializer Init to the 5884/// declaration dcl. If DirectInit is true, this is C++ direct 5885/// initialization rather than copy initialization. 5886void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5887 bool DirectInit, bool TypeMayContainAuto) { 5888 // If there is no declaration, there was an error parsing it. Just ignore 5889 // the initializer. 5890 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5891 return; 5892 5893 // Check for self-references within variable initializers. 5894 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5895 // Variables declared within a function/method body are handled 5896 // by a dataflow analysis. 5897 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5898 CheckSelfReference(RealDecl, Init); 5899 } 5900 else { 5901 CheckSelfReference(RealDecl, Init); 5902 } 5903 5904 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5905 // With declarators parsed the way they are, the parser cannot 5906 // distinguish between a normal initializer and a pure-specifier. 5907 // Thus this grotesque test. 5908 IntegerLiteral *IL; 5909 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5910 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5911 CheckPureMethod(Method, Init->getSourceRange()); 5912 else { 5913 Diag(Method->getLocation(), diag::err_member_function_initialization) 5914 << Method->getDeclName() << Init->getSourceRange(); 5915 Method->setInvalidDecl(); 5916 } 5917 return; 5918 } 5919 5920 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5921 if (!VDecl) { 5922 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5923 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5924 RealDecl->setInvalidDecl(); 5925 return; 5926 } 5927 5928 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5929 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5930 TypeSourceInfo *DeducedType = 0; 5931 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5932 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5933 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5934 << Init->getSourceRange(); 5935 if (!DeducedType) { 5936 RealDecl->setInvalidDecl(); 5937 return; 5938 } 5939 VDecl->setTypeSourceInfo(DeducedType); 5940 VDecl->setType(DeducedType->getType()); 5941 5942 // In ARC, infer lifetime. 5943 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5944 VDecl->setInvalidDecl(); 5945 5946 // If this is a redeclaration, check that the type we just deduced matches 5947 // the previously declared type. 5948 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5949 MergeVarDeclTypes(VDecl, Old); 5950 } 5951 5952 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 5953 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 5954 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5955 VDecl->setInvalidDecl(); 5956 return; 5957 } 5958 5959 5960 // A definition must end up with a complete type, which means it must be 5961 // complete with the restriction that an array type might be completed by the 5962 // initializer; note that later code assumes this restriction. 5963 QualType BaseDeclType = VDecl->getType(); 5964 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5965 BaseDeclType = Array->getElementType(); 5966 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5967 diag::err_typecheck_decl_incomplete_type)) { 5968 RealDecl->setInvalidDecl(); 5969 return; 5970 } 5971 5972 // The variable can not have an abstract class type. 5973 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5974 diag::err_abstract_type_in_decl, 5975 AbstractVariableType)) 5976 VDecl->setInvalidDecl(); 5977 5978 const VarDecl *Def; 5979 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5980 Diag(VDecl->getLocation(), diag::err_redefinition) 5981 << VDecl->getDeclName(); 5982 Diag(Def->getLocation(), diag::note_previous_definition); 5983 VDecl->setInvalidDecl(); 5984 return; 5985 } 5986 5987 const VarDecl* PrevInit = 0; 5988 if (getLangOptions().CPlusPlus) { 5989 // C++ [class.static.data]p4 5990 // If a static data member is of const integral or const 5991 // enumeration type, its declaration in the class definition can 5992 // specify a constant-initializer which shall be an integral 5993 // constant expression (5.19). In that case, the member can appear 5994 // in integral constant expressions. The member shall still be 5995 // defined in a namespace scope if it is used in the program and the 5996 // namespace scope definition shall not contain an initializer. 5997 // 5998 // We already performed a redefinition check above, but for static 5999 // data members we also need to check whether there was an in-class 6000 // declaration with an initializer. 6001 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6002 Diag(VDecl->getLocation(), diag::err_redefinition) 6003 << VDecl->getDeclName(); 6004 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6005 return; 6006 } 6007 6008 if (VDecl->hasLocalStorage()) 6009 getCurFunction()->setHasBranchProtectedScope(); 6010 6011 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6012 VDecl->setInvalidDecl(); 6013 return; 6014 } 6015 } 6016 6017 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6018 // a kernel function cannot be initialized." 6019 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6020 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6021 VDecl->setInvalidDecl(); 6022 return; 6023 } 6024 6025 // Get the decls type and save a reference for later, since 6026 // CheckInitializerTypes may change it. 6027 QualType DclT = VDecl->getType(), SavT = DclT; 6028 6029 // Perform the initialization. 6030 if (!VDecl->isInvalidDecl()) { 6031 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6032 InitializationKind Kind 6033 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6034 Init->getLocStart(), 6035 Init->getLocEnd()) 6036 : InitializationKind::CreateCopy(VDecl->getLocation(), 6037 Init->getLocStart()); 6038 6039 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6040 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6041 MultiExprArg(*this, &Init, 1), 6042 &DclT); 6043 if (Result.isInvalid()) { 6044 VDecl->setInvalidDecl(); 6045 return; 6046 } 6047 6048 Init = Result.takeAs<Expr>(); 6049 } 6050 6051 // If the type changed, it means we had an incomplete type that was 6052 // completed by the initializer. For example: 6053 // int ary[] = { 1, 3, 5 }; 6054 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6055 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6056 VDecl->setType(DclT); 6057 Init->setType(DclT.getNonReferenceType()); 6058 } 6059 6060 // Check any implicit conversions within the expression. 6061 CheckImplicitConversions(Init, VDecl->getLocation()); 6062 6063 if (!VDecl->isInvalidDecl()) 6064 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6065 6066 Init = MaybeCreateExprWithCleanups(Init); 6067 // Attach the initializer to the decl. 6068 VDecl->setInit(Init); 6069 6070 if (VDecl->isLocalVarDecl()) { 6071 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6072 // static storage duration shall be constant expressions or string literals. 6073 // C++ does not have this restriction. 6074 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6075 VDecl->getStorageClass() == SC_Static) 6076 CheckForConstantInitializer(Init, DclT); 6077 } else if (VDecl->isStaticDataMember() && 6078 VDecl->getLexicalDeclContext()->isRecord()) { 6079 // This is an in-class initialization for a static data member, e.g., 6080 // 6081 // struct S { 6082 // static const int value = 17; 6083 // }; 6084 6085 // C++ [class.mem]p4: 6086 // A member-declarator can contain a constant-initializer only 6087 // if it declares a static member (9.4) of const integral or 6088 // const enumeration type, see 9.4.2. 6089 // 6090 // C++11 [class.static.data]p3: 6091 // If a non-volatile const static data member is of integral or 6092 // enumeration type, its declaration in the class definition can 6093 // specify a brace-or-equal-initializer in which every initalizer-clause 6094 // that is an assignment-expression is a constant expression. A static 6095 // data member of literal type can be declared in the class definition 6096 // with the constexpr specifier; if so, its declaration shall specify a 6097 // brace-or-equal-initializer in which every initializer-clause that is 6098 // an assignment-expression is a constant expression. 6099 6100 // Do nothing on dependent types. 6101 if (DclT->isDependentType()) { 6102 6103 // Allow any 'static constexpr' members, whether or not they are of literal 6104 // type. We separately check that the initializer is a constant expression, 6105 // which implicitly requires the member to be of literal type. 6106 } else if (VDecl->isConstexpr()) { 6107 6108 // Require constness. 6109 } else if (!DclT.isConstQualified()) { 6110 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6111 << Init->getSourceRange(); 6112 VDecl->setInvalidDecl(); 6113 6114 // We allow integer constant expressions in all cases. 6115 } else if (DclT->isIntegralOrEnumerationType()) { 6116 // Check whether the expression is a constant expression. 6117 SourceLocation Loc; 6118 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6119 // In C++11, a non-constexpr const static data member with an 6120 // in-class initializer cannot be volatile. 6121 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6122 else if (Init->isValueDependent()) 6123 ; // Nothing to check. 6124 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6125 ; // Ok, it's an ICE! 6126 else if (Init->isEvaluatable(Context)) { 6127 // If we can constant fold the initializer through heroics, accept it, 6128 // but report this as a use of an extension for -pedantic. 6129 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6130 << Init->getSourceRange(); 6131 } else { 6132 // Otherwise, this is some crazy unknown case. Report the issue at the 6133 // location provided by the isIntegerConstantExpr failed check. 6134 Diag(Loc, diag::err_in_class_initializer_non_constant) 6135 << Init->getSourceRange(); 6136 VDecl->setInvalidDecl(); 6137 } 6138 6139 // We allow foldable floating-point constants as an extension. 6140 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6141 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6142 << DclT << Init->getSourceRange(); 6143 if (getLangOptions().CPlusPlus0x) 6144 Diag(VDecl->getLocation(), 6145 diag::note_in_class_initializer_float_type_constexpr) 6146 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6147 6148 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6149 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6150 << Init->getSourceRange(); 6151 VDecl->setInvalidDecl(); 6152 } 6153 6154 // Suggest adding 'constexpr' in C++11 for literal types. 6155 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6156 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6157 << DclT << Init->getSourceRange() 6158 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6159 VDecl->setConstexpr(true); 6160 6161 } else { 6162 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6163 << DclT << Init->getSourceRange(); 6164 VDecl->setInvalidDecl(); 6165 } 6166 } else if (VDecl->isFileVarDecl()) { 6167 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6168 (!getLangOptions().CPlusPlus || 6169 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6170 Diag(VDecl->getLocation(), diag::warn_extern_init); 6171 6172 // C99 6.7.8p4. All file scoped initializers need to be constant. 6173 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6174 CheckForConstantInitializer(Init, DclT); 6175 } 6176 6177 CheckCompleteVariableDeclaration(VDecl); 6178} 6179 6180/// ActOnInitializerError - Given that there was an error parsing an 6181/// initializer for the given declaration, try to return to some form 6182/// of sanity. 6183void Sema::ActOnInitializerError(Decl *D) { 6184 // Our main concern here is re-establishing invariants like "a 6185 // variable's type is either dependent or complete". 6186 if (!D || D->isInvalidDecl()) return; 6187 6188 VarDecl *VD = dyn_cast<VarDecl>(D); 6189 if (!VD) return; 6190 6191 // Auto types are meaningless if we can't make sense of the initializer. 6192 if (ParsingInitForAutoVars.count(D)) { 6193 D->setInvalidDecl(); 6194 return; 6195 } 6196 6197 QualType Ty = VD->getType(); 6198 if (Ty->isDependentType()) return; 6199 6200 // Require a complete type. 6201 if (RequireCompleteType(VD->getLocation(), 6202 Context.getBaseElementType(Ty), 6203 diag::err_typecheck_decl_incomplete_type)) { 6204 VD->setInvalidDecl(); 6205 return; 6206 } 6207 6208 // Require an abstract type. 6209 if (RequireNonAbstractType(VD->getLocation(), Ty, 6210 diag::err_abstract_type_in_decl, 6211 AbstractVariableType)) { 6212 VD->setInvalidDecl(); 6213 return; 6214 } 6215 6216 // Don't bother complaining about constructors or destructors, 6217 // though. 6218} 6219 6220void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6221 bool TypeMayContainAuto) { 6222 // If there is no declaration, there was an error parsing it. Just ignore it. 6223 if (RealDecl == 0) 6224 return; 6225 6226 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6227 QualType Type = Var->getType(); 6228 6229 // C++11 [dcl.spec.auto]p3 6230 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6231 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6232 << Var->getDeclName() << Type; 6233 Var->setInvalidDecl(); 6234 return; 6235 } 6236 6237 // C++11 [class.static.data]p3: A static data member can be declared with 6238 // the constexpr specifier; if so, its declaration shall specify 6239 // a brace-or-equal-initializer. 6240 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6241 // the definition of a variable [...] or the declaration of a static data 6242 // member. 6243 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6244 if (Var->isStaticDataMember()) 6245 Diag(Var->getLocation(), 6246 diag::err_constexpr_static_mem_var_requires_init) 6247 << Var->getDeclName(); 6248 else 6249 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6250 Var->setInvalidDecl(); 6251 return; 6252 } 6253 6254 switch (Var->isThisDeclarationADefinition()) { 6255 case VarDecl::Definition: 6256 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6257 break; 6258 6259 // We have an out-of-line definition of a static data member 6260 // that has an in-class initializer, so we type-check this like 6261 // a declaration. 6262 // 6263 // Fall through 6264 6265 case VarDecl::DeclarationOnly: 6266 // It's only a declaration. 6267 6268 // Block scope. C99 6.7p7: If an identifier for an object is 6269 // declared with no linkage (C99 6.2.2p6), the type for the 6270 // object shall be complete. 6271 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6272 !Var->getLinkage() && !Var->isInvalidDecl() && 6273 RequireCompleteType(Var->getLocation(), Type, 6274 diag::err_typecheck_decl_incomplete_type)) 6275 Var->setInvalidDecl(); 6276 6277 // Make sure that the type is not abstract. 6278 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6279 RequireNonAbstractType(Var->getLocation(), Type, 6280 diag::err_abstract_type_in_decl, 6281 AbstractVariableType)) 6282 Var->setInvalidDecl(); 6283 return; 6284 6285 case VarDecl::TentativeDefinition: 6286 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6287 // object that has file scope without an initializer, and without a 6288 // storage-class specifier or with the storage-class specifier "static", 6289 // constitutes a tentative definition. Note: A tentative definition with 6290 // external linkage is valid (C99 6.2.2p5). 6291 if (!Var->isInvalidDecl()) { 6292 if (const IncompleteArrayType *ArrayT 6293 = Context.getAsIncompleteArrayType(Type)) { 6294 if (RequireCompleteType(Var->getLocation(), 6295 ArrayT->getElementType(), 6296 diag::err_illegal_decl_array_incomplete_type)) 6297 Var->setInvalidDecl(); 6298 } else if (Var->getStorageClass() == SC_Static) { 6299 // C99 6.9.2p3: If the declaration of an identifier for an object is 6300 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6301 // declared type shall not be an incomplete type. 6302 // NOTE: code such as the following 6303 // static struct s; 6304 // struct s { int a; }; 6305 // is accepted by gcc. Hence here we issue a warning instead of 6306 // an error and we do not invalidate the static declaration. 6307 // NOTE: to avoid multiple warnings, only check the first declaration. 6308 if (Var->getPreviousDeclaration() == 0) 6309 RequireCompleteType(Var->getLocation(), Type, 6310 diag::ext_typecheck_decl_incomplete_type); 6311 } 6312 } 6313 6314 // Record the tentative definition; we're done. 6315 if (!Var->isInvalidDecl()) 6316 TentativeDefinitions.push_back(Var); 6317 return; 6318 } 6319 6320 // Provide a specific diagnostic for uninitialized variable 6321 // definitions with incomplete array type. 6322 if (Type->isIncompleteArrayType()) { 6323 Diag(Var->getLocation(), 6324 diag::err_typecheck_incomplete_array_needs_initializer); 6325 Var->setInvalidDecl(); 6326 return; 6327 } 6328 6329 // Provide a specific diagnostic for uninitialized variable 6330 // definitions with reference type. 6331 if (Type->isReferenceType()) { 6332 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6333 << Var->getDeclName() 6334 << SourceRange(Var->getLocation(), Var->getLocation()); 6335 Var->setInvalidDecl(); 6336 return; 6337 } 6338 6339 // Do not attempt to type-check the default initializer for a 6340 // variable with dependent type. 6341 if (Type->isDependentType()) 6342 return; 6343 6344 if (Var->isInvalidDecl()) 6345 return; 6346 6347 if (RequireCompleteType(Var->getLocation(), 6348 Context.getBaseElementType(Type), 6349 diag::err_typecheck_decl_incomplete_type)) { 6350 Var->setInvalidDecl(); 6351 return; 6352 } 6353 6354 // The variable can not have an abstract class type. 6355 if (RequireNonAbstractType(Var->getLocation(), Type, 6356 diag::err_abstract_type_in_decl, 6357 AbstractVariableType)) { 6358 Var->setInvalidDecl(); 6359 return; 6360 } 6361 6362 // Check for jumps past the implicit initializer. C++0x 6363 // clarifies that this applies to a "variable with automatic 6364 // storage duration", not a "local variable". 6365 // C++11 [stmt.dcl]p3 6366 // A program that jumps from a point where a variable with automatic 6367 // storage duration is not in scope to a point where it is in scope is 6368 // ill-formed unless the variable has scalar type, class type with a 6369 // trivial default constructor and a trivial destructor, a cv-qualified 6370 // version of one of these types, or an array of one of the preceding 6371 // types and is declared without an initializer. 6372 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6373 if (const RecordType *Record 6374 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6375 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6376 // Mark the function for further checking even if the looser rules of 6377 // C++11 do not require such checks, so that we can diagnose 6378 // incompatibilities with C++98. 6379 if (!CXXRecord->isPOD()) 6380 getCurFunction()->setHasBranchProtectedScope(); 6381 } 6382 } 6383 6384 // C++03 [dcl.init]p9: 6385 // If no initializer is specified for an object, and the 6386 // object is of (possibly cv-qualified) non-POD class type (or 6387 // array thereof), the object shall be default-initialized; if 6388 // the object is of const-qualified type, the underlying class 6389 // type shall have a user-declared default 6390 // constructor. Otherwise, if no initializer is specified for 6391 // a non- static object, the object and its subobjects, if 6392 // any, have an indeterminate initial value); if the object 6393 // or any of its subobjects are of const-qualified type, the 6394 // program is ill-formed. 6395 // C++0x [dcl.init]p11: 6396 // If no initializer is specified for an object, the object is 6397 // default-initialized; [...]. 6398 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6399 InitializationKind Kind 6400 = InitializationKind::CreateDefault(Var->getLocation()); 6401 6402 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6403 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6404 MultiExprArg(*this, 0, 0)); 6405 if (Init.isInvalid()) 6406 Var->setInvalidDecl(); 6407 else if (Init.get()) 6408 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6409 6410 CheckCompleteVariableDeclaration(Var); 6411 } 6412} 6413 6414void Sema::ActOnCXXForRangeDecl(Decl *D) { 6415 VarDecl *VD = dyn_cast<VarDecl>(D); 6416 if (!VD) { 6417 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6418 D->setInvalidDecl(); 6419 return; 6420 } 6421 6422 VD->setCXXForRangeDecl(true); 6423 6424 // for-range-declaration cannot be given a storage class specifier. 6425 int Error = -1; 6426 switch (VD->getStorageClassAsWritten()) { 6427 case SC_None: 6428 break; 6429 case SC_Extern: 6430 Error = 0; 6431 break; 6432 case SC_Static: 6433 Error = 1; 6434 break; 6435 case SC_PrivateExtern: 6436 Error = 2; 6437 break; 6438 case SC_Auto: 6439 Error = 3; 6440 break; 6441 case SC_Register: 6442 Error = 4; 6443 break; 6444 case SC_OpenCLWorkGroupLocal: 6445 llvm_unreachable("Unexpected storage class"); 6446 } 6447 if (VD->isConstexpr()) 6448 Error = 5; 6449 if (Error != -1) { 6450 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6451 << VD->getDeclName() << Error; 6452 D->setInvalidDecl(); 6453 } 6454} 6455 6456void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6457 if (var->isInvalidDecl()) return; 6458 6459 // In ARC, don't allow jumps past the implicit initialization of a 6460 // local retaining variable. 6461 if (getLangOptions().ObjCAutoRefCount && 6462 var->hasLocalStorage()) { 6463 switch (var->getType().getObjCLifetime()) { 6464 case Qualifiers::OCL_None: 6465 case Qualifiers::OCL_ExplicitNone: 6466 case Qualifiers::OCL_Autoreleasing: 6467 break; 6468 6469 case Qualifiers::OCL_Weak: 6470 case Qualifiers::OCL_Strong: 6471 getCurFunction()->setHasBranchProtectedScope(); 6472 break; 6473 } 6474 } 6475 6476 // All the following checks are C++ only. 6477 if (!getLangOptions().CPlusPlus) return; 6478 6479 QualType baseType = Context.getBaseElementType(var->getType()); 6480 if (baseType->isDependentType()) return; 6481 6482 // __block variables might require us to capture a copy-initializer. 6483 if (var->hasAttr<BlocksAttr>()) { 6484 // It's currently invalid to ever have a __block variable with an 6485 // array type; should we diagnose that here? 6486 6487 // Regardless, we don't want to ignore array nesting when 6488 // constructing this copy. 6489 QualType type = var->getType(); 6490 6491 if (type->isStructureOrClassType()) { 6492 SourceLocation poi = var->getLocation(); 6493 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6494 ExprResult result = 6495 PerformCopyInitialization( 6496 InitializedEntity::InitializeBlock(poi, type, false), 6497 poi, Owned(varRef)); 6498 if (!result.isInvalid()) { 6499 result = MaybeCreateExprWithCleanups(result); 6500 Expr *init = result.takeAs<Expr>(); 6501 Context.setBlockVarCopyInits(var, init); 6502 } 6503 } 6504 } 6505 6506 Expr *Init = var->getInit(); 6507 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6508 6509 if (!var->getDeclContext()->isDependentContext() && Init) { 6510 if (IsGlobal && !var->isConstexpr() && 6511 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6512 var->getLocation()) 6513 != DiagnosticsEngine::Ignored && 6514 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6515 Diag(var->getLocation(), diag::warn_global_constructor) 6516 << Init->getSourceRange(); 6517 6518 if (var->isConstexpr()) { 6519 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6520 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6521 SourceLocation DiagLoc = var->getLocation(); 6522 // If the note doesn't add any useful information other than a source 6523 // location, fold it into the primary diagnostic. 6524 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6525 diag::note_invalid_subexpr_in_const_expr) { 6526 DiagLoc = Notes[0].first; 6527 Notes.clear(); 6528 } 6529 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6530 << var << Init->getSourceRange(); 6531 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6532 Diag(Notes[I].first, Notes[I].second); 6533 } 6534 } else if (var->isUsableInConstantExpressions()) { 6535 // Check whether the initializer of a const variable of integral or 6536 // enumeration type is an ICE now, since we can't tell whether it was 6537 // initialized by a constant expression if we check later. 6538 var->checkInitIsICE(); 6539 } 6540 } 6541 6542 // Require the destructor. 6543 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6544 FinalizeVarWithDestructor(var, recordType); 6545} 6546 6547/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6548/// any semantic actions necessary after any initializer has been attached. 6549void 6550Sema::FinalizeDeclaration(Decl *ThisDecl) { 6551 // Note that we are no longer parsing the initializer for this declaration. 6552 ParsingInitForAutoVars.erase(ThisDecl); 6553} 6554 6555Sema::DeclGroupPtrTy 6556Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6557 Decl **Group, unsigned NumDecls) { 6558 SmallVector<Decl*, 8> Decls; 6559 6560 if (DS.isTypeSpecOwned()) 6561 Decls.push_back(DS.getRepAsDecl()); 6562 6563 for (unsigned i = 0; i != NumDecls; ++i) 6564 if (Decl *D = Group[i]) 6565 Decls.push_back(D); 6566 6567 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6568 DS.getTypeSpecType() == DeclSpec::TST_auto); 6569} 6570 6571/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6572/// group, performing any necessary semantic checking. 6573Sema::DeclGroupPtrTy 6574Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6575 bool TypeMayContainAuto) { 6576 // C++0x [dcl.spec.auto]p7: 6577 // If the type deduced for the template parameter U is not the same in each 6578 // deduction, the program is ill-formed. 6579 // FIXME: When initializer-list support is added, a distinction is needed 6580 // between the deduced type U and the deduced type which 'auto' stands for. 6581 // auto a = 0, b = { 1, 2, 3 }; 6582 // is legal because the deduced type U is 'int' in both cases. 6583 if (TypeMayContainAuto && NumDecls > 1) { 6584 QualType Deduced; 6585 CanQualType DeducedCanon; 6586 VarDecl *DeducedDecl = 0; 6587 for (unsigned i = 0; i != NumDecls; ++i) { 6588 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6589 AutoType *AT = D->getType()->getContainedAutoType(); 6590 // Don't reissue diagnostics when instantiating a template. 6591 if (AT && D->isInvalidDecl()) 6592 break; 6593 if (AT && AT->isDeduced()) { 6594 QualType U = AT->getDeducedType(); 6595 CanQualType UCanon = Context.getCanonicalType(U); 6596 if (Deduced.isNull()) { 6597 Deduced = U; 6598 DeducedCanon = UCanon; 6599 DeducedDecl = D; 6600 } else if (DeducedCanon != UCanon) { 6601 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6602 diag::err_auto_different_deductions) 6603 << Deduced << DeducedDecl->getDeclName() 6604 << U << D->getDeclName() 6605 << DeducedDecl->getInit()->getSourceRange() 6606 << D->getInit()->getSourceRange(); 6607 D->setInvalidDecl(); 6608 break; 6609 } 6610 } 6611 } 6612 } 6613 } 6614 6615 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6616} 6617 6618 6619/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6620/// to introduce parameters into function prototype scope. 6621Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6622 const DeclSpec &DS = D.getDeclSpec(); 6623 6624 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6625 // C++03 [dcl.stc]p2 also permits 'auto'. 6626 VarDecl::StorageClass StorageClass = SC_None; 6627 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6628 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6629 StorageClass = SC_Register; 6630 StorageClassAsWritten = SC_Register; 6631 } else if (getLangOptions().CPlusPlus && 6632 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6633 StorageClass = SC_Auto; 6634 StorageClassAsWritten = SC_Auto; 6635 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6636 Diag(DS.getStorageClassSpecLoc(), 6637 diag::err_invalid_storage_class_in_func_decl); 6638 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6639 } 6640 6641 if (D.getDeclSpec().isThreadSpecified()) 6642 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6643 if (D.getDeclSpec().isConstexprSpecified()) 6644 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6645 << 0; 6646 6647 DiagnoseFunctionSpecifiers(D); 6648 6649 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6650 QualType parmDeclType = TInfo->getType(); 6651 6652 if (getLangOptions().CPlusPlus) { 6653 // Check that there are no default arguments inside the type of this 6654 // parameter. 6655 CheckExtraCXXDefaultArguments(D); 6656 6657 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6658 if (D.getCXXScopeSpec().isSet()) { 6659 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6660 << D.getCXXScopeSpec().getRange(); 6661 D.getCXXScopeSpec().clear(); 6662 } 6663 } 6664 6665 // Ensure we have a valid name 6666 IdentifierInfo *II = 0; 6667 if (D.hasName()) { 6668 II = D.getIdentifier(); 6669 if (!II) { 6670 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6671 << GetNameForDeclarator(D).getName().getAsString(); 6672 D.setInvalidType(true); 6673 } 6674 } 6675 6676 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6677 if (II) { 6678 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6679 ForRedeclaration); 6680 LookupName(R, S); 6681 if (R.isSingleResult()) { 6682 NamedDecl *PrevDecl = R.getFoundDecl(); 6683 if (PrevDecl->isTemplateParameter()) { 6684 // Maybe we will complain about the shadowed template parameter. 6685 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6686 // Just pretend that we didn't see the previous declaration. 6687 PrevDecl = 0; 6688 } else if (S->isDeclScope(PrevDecl)) { 6689 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6690 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6691 6692 // Recover by removing the name 6693 II = 0; 6694 D.SetIdentifier(0, D.getIdentifierLoc()); 6695 D.setInvalidType(true); 6696 } 6697 } 6698 } 6699 6700 // Temporarily put parameter variables in the translation unit, not 6701 // the enclosing context. This prevents them from accidentally 6702 // looking like class members in C++. 6703 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6704 D.getSourceRange().getBegin(), 6705 D.getIdentifierLoc(), II, 6706 parmDeclType, TInfo, 6707 StorageClass, StorageClassAsWritten); 6708 6709 if (D.isInvalidType()) 6710 New->setInvalidDecl(); 6711 6712 assert(S->isFunctionPrototypeScope()); 6713 assert(S->getFunctionPrototypeDepth() >= 1); 6714 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6715 S->getNextFunctionPrototypeIndex()); 6716 6717 // Add the parameter declaration into this scope. 6718 S->AddDecl(New); 6719 if (II) 6720 IdResolver.AddDecl(New); 6721 6722 ProcessDeclAttributes(S, New, D); 6723 6724 if (D.getDeclSpec().isModulePrivateSpecified()) 6725 Diag(New->getLocation(), diag::err_module_private_local) 6726 << 1 << New->getDeclName() 6727 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6728 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6729 6730 if (New->hasAttr<BlocksAttr>()) { 6731 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6732 } 6733 return New; 6734} 6735 6736/// \brief Synthesizes a variable for a parameter arising from a 6737/// typedef. 6738ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6739 SourceLocation Loc, 6740 QualType T) { 6741 /* FIXME: setting StartLoc == Loc. 6742 Would it be worth to modify callers so as to provide proper source 6743 location for the unnamed parameters, embedding the parameter's type? */ 6744 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6745 T, Context.getTrivialTypeSourceInfo(T, Loc), 6746 SC_None, SC_None, 0); 6747 Param->setImplicit(); 6748 return Param; 6749} 6750 6751void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6752 ParmVarDecl * const *ParamEnd) { 6753 // Don't diagnose unused-parameter errors in template instantiations; we 6754 // will already have done so in the template itself. 6755 if (!ActiveTemplateInstantiations.empty()) 6756 return; 6757 6758 for (; Param != ParamEnd; ++Param) { 6759 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6760 !(*Param)->hasAttr<UnusedAttr>()) { 6761 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6762 << (*Param)->getDeclName(); 6763 } 6764 } 6765} 6766 6767void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6768 ParmVarDecl * const *ParamEnd, 6769 QualType ReturnTy, 6770 NamedDecl *D) { 6771 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6772 return; 6773 6774 // Warn if the return value is pass-by-value and larger than the specified 6775 // threshold. 6776 if (ReturnTy.isPODType(Context)) { 6777 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6778 if (Size > LangOpts.NumLargeByValueCopy) 6779 Diag(D->getLocation(), diag::warn_return_value_size) 6780 << D->getDeclName() << Size; 6781 } 6782 6783 // Warn if any parameter is pass-by-value and larger than the specified 6784 // threshold. 6785 for (; Param != ParamEnd; ++Param) { 6786 QualType T = (*Param)->getType(); 6787 if (!T.isPODType(Context)) 6788 continue; 6789 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6790 if (Size > LangOpts.NumLargeByValueCopy) 6791 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6792 << (*Param)->getDeclName() << Size; 6793 } 6794} 6795 6796ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6797 SourceLocation NameLoc, IdentifierInfo *Name, 6798 QualType T, TypeSourceInfo *TSInfo, 6799 VarDecl::StorageClass StorageClass, 6800 VarDecl::StorageClass StorageClassAsWritten) { 6801 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6802 if (getLangOptions().ObjCAutoRefCount && 6803 T.getObjCLifetime() == Qualifiers::OCL_None && 6804 T->isObjCLifetimeType()) { 6805 6806 Qualifiers::ObjCLifetime lifetime; 6807 6808 // Special cases for arrays: 6809 // - if it's const, use __unsafe_unretained 6810 // - otherwise, it's an error 6811 if (T->isArrayType()) { 6812 if (!T.isConstQualified()) { 6813 DelayedDiagnostics.add( 6814 sema::DelayedDiagnostic::makeForbiddenType( 6815 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6816 } 6817 lifetime = Qualifiers::OCL_ExplicitNone; 6818 } else { 6819 lifetime = T->getObjCARCImplicitLifetime(); 6820 } 6821 T = Context.getLifetimeQualifiedType(T, lifetime); 6822 } 6823 6824 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6825 Context.getAdjustedParameterType(T), 6826 TSInfo, 6827 StorageClass, StorageClassAsWritten, 6828 0); 6829 6830 // Parameters can not be abstract class types. 6831 // For record types, this is done by the AbstractClassUsageDiagnoser once 6832 // the class has been completely parsed. 6833 if (!CurContext->isRecord() && 6834 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6835 AbstractParamType)) 6836 New->setInvalidDecl(); 6837 6838 // Parameter declarators cannot be interface types. All ObjC objects are 6839 // passed by reference. 6840 if (T->isObjCObjectType()) { 6841 Diag(NameLoc, 6842 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6843 << FixItHint::CreateInsertion(NameLoc, "*"); 6844 T = Context.getObjCObjectPointerType(T); 6845 New->setType(T); 6846 } 6847 6848 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6849 // duration shall not be qualified by an address-space qualifier." 6850 // Since all parameters have automatic store duration, they can not have 6851 // an address space. 6852 if (T.getAddressSpace() != 0) { 6853 Diag(NameLoc, diag::err_arg_with_address_space); 6854 New->setInvalidDecl(); 6855 } 6856 6857 return New; 6858} 6859 6860void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6861 SourceLocation LocAfterDecls) { 6862 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6863 6864 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6865 // for a K&R function. 6866 if (!FTI.hasPrototype) { 6867 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6868 --i; 6869 if (FTI.ArgInfo[i].Param == 0) { 6870 llvm::SmallString<256> Code; 6871 llvm::raw_svector_ostream(Code) << " int " 6872 << FTI.ArgInfo[i].Ident->getName() 6873 << ";\n"; 6874 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6875 << FTI.ArgInfo[i].Ident 6876 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6877 6878 // Implicitly declare the argument as type 'int' for lack of a better 6879 // type. 6880 AttributeFactory attrs; 6881 DeclSpec DS(attrs); 6882 const char* PrevSpec; // unused 6883 unsigned DiagID; // unused 6884 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6885 PrevSpec, DiagID); 6886 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6887 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6888 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6889 } 6890 } 6891 } 6892} 6893 6894Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6895 Declarator &D) { 6896 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6897 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6898 Scope *ParentScope = FnBodyScope->getParent(); 6899 6900 D.setFunctionDefinitionKind(FDK_Definition); 6901 Decl *DP = HandleDeclarator(ParentScope, D, 6902 MultiTemplateParamsArg(*this)); 6903 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6904} 6905 6906static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6907 // Don't warn about invalid declarations. 6908 if (FD->isInvalidDecl()) 6909 return false; 6910 6911 // Or declarations that aren't global. 6912 if (!FD->isGlobal()) 6913 return false; 6914 6915 // Don't warn about C++ member functions. 6916 if (isa<CXXMethodDecl>(FD)) 6917 return false; 6918 6919 // Don't warn about 'main'. 6920 if (FD->isMain()) 6921 return false; 6922 6923 // Don't warn about inline functions. 6924 if (FD->isInlined()) 6925 return false; 6926 6927 // Don't warn about function templates. 6928 if (FD->getDescribedFunctionTemplate()) 6929 return false; 6930 6931 // Don't warn about function template specializations. 6932 if (FD->isFunctionTemplateSpecialization()) 6933 return false; 6934 6935 bool MissingPrototype = true; 6936 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6937 Prev; Prev = Prev->getPreviousDeclaration()) { 6938 // Ignore any declarations that occur in function or method 6939 // scope, because they aren't visible from the header. 6940 if (Prev->getDeclContext()->isFunctionOrMethod()) 6941 continue; 6942 6943 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6944 break; 6945 } 6946 6947 return MissingPrototype; 6948} 6949 6950void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6951 // Don't complain if we're in GNU89 mode and the previous definition 6952 // was an extern inline function. 6953 const FunctionDecl *Definition; 6954 if (FD->isDefined(Definition) && 6955 !canRedefineFunction(Definition, getLangOptions())) { 6956 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6957 Definition->getStorageClass() == SC_Extern) 6958 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6959 << FD->getDeclName() << getLangOptions().CPlusPlus; 6960 else 6961 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6962 Diag(Definition->getLocation(), diag::note_previous_definition); 6963 } 6964} 6965 6966Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6967 // Clear the last template instantiation error context. 6968 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6969 6970 if (!D) 6971 return D; 6972 FunctionDecl *FD = 0; 6973 6974 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6975 FD = FunTmpl->getTemplatedDecl(); 6976 else 6977 FD = cast<FunctionDecl>(D); 6978 6979 // Enter a new function scope 6980 PushFunctionScope(); 6981 6982 // See if this is a redefinition. 6983 if (!FD->isLateTemplateParsed()) 6984 CheckForFunctionRedefinition(FD); 6985 6986 // Builtin functions cannot be defined. 6987 if (unsigned BuiltinID = FD->getBuiltinID()) { 6988 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6989 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6990 FD->setInvalidDecl(); 6991 } 6992 } 6993 6994 // The return type of a function definition must be complete 6995 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6996 QualType ResultType = FD->getResultType(); 6997 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6998 !FD->isInvalidDecl() && 6999 RequireCompleteType(FD->getLocation(), ResultType, 7000 diag::err_func_def_incomplete_result)) 7001 FD->setInvalidDecl(); 7002 7003 // GNU warning -Wmissing-prototypes: 7004 // Warn if a global function is defined without a previous 7005 // prototype declaration. This warning is issued even if the 7006 // definition itself provides a prototype. The aim is to detect 7007 // global functions that fail to be declared in header files. 7008 if (ShouldWarnAboutMissingPrototype(FD)) 7009 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7010 7011 if (FnBodyScope) 7012 PushDeclContext(FnBodyScope, FD); 7013 7014 // Check the validity of our function parameters 7015 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7016 /*CheckParameterNames=*/true); 7017 7018 // Introduce our parameters into the function scope 7019 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7020 ParmVarDecl *Param = FD->getParamDecl(p); 7021 Param->setOwningFunction(FD); 7022 7023 // If this has an identifier, add it to the scope stack. 7024 if (Param->getIdentifier() && FnBodyScope) { 7025 CheckShadow(FnBodyScope, Param); 7026 7027 PushOnScopeChains(Param, FnBodyScope); 7028 } 7029 } 7030 7031 // Checking attributes of current function definition 7032 // dllimport attribute. 7033 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7034 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7035 // dllimport attribute cannot be directly applied to definition. 7036 // Microsoft accepts dllimport for functions defined within class scope. 7037 if (!DA->isInherited() && 7038 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7039 Diag(FD->getLocation(), 7040 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7041 << "dllimport"; 7042 FD->setInvalidDecl(); 7043 return FD; 7044 } 7045 7046 // Visual C++ appears to not think this is an issue, so only issue 7047 // a warning when Microsoft extensions are disabled. 7048 if (!LangOpts.MicrosoftExt) { 7049 // If a symbol previously declared dllimport is later defined, the 7050 // attribute is ignored in subsequent references, and a warning is 7051 // emitted. 7052 Diag(FD->getLocation(), 7053 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7054 << FD->getName() << "dllimport"; 7055 } 7056 } 7057 return FD; 7058} 7059 7060/// \brief Given the set of return statements within a function body, 7061/// compute the variables that are subject to the named return value 7062/// optimization. 7063/// 7064/// Each of the variables that is subject to the named return value 7065/// optimization will be marked as NRVO variables in the AST, and any 7066/// return statement that has a marked NRVO variable as its NRVO candidate can 7067/// use the named return value optimization. 7068/// 7069/// This function applies a very simplistic algorithm for NRVO: if every return 7070/// statement in the function has the same NRVO candidate, that candidate is 7071/// the NRVO variable. 7072/// 7073/// FIXME: Employ a smarter algorithm that accounts for multiple return 7074/// statements and the lifetimes of the NRVO candidates. We should be able to 7075/// find a maximal set of NRVO variables. 7076void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7077 ReturnStmt **Returns = Scope->Returns.data(); 7078 7079 const VarDecl *NRVOCandidate = 0; 7080 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7081 if (!Returns[I]->getNRVOCandidate()) 7082 return; 7083 7084 if (!NRVOCandidate) 7085 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7086 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7087 return; 7088 } 7089 7090 if (NRVOCandidate) 7091 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7092} 7093 7094Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7095 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7096} 7097 7098Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7099 bool IsInstantiation) { 7100 FunctionDecl *FD = 0; 7101 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7102 if (FunTmpl) 7103 FD = FunTmpl->getTemplatedDecl(); 7104 else 7105 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7106 7107 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7108 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7109 7110 if (FD) { 7111 FD->setBody(Body); 7112 if (FD->isMain()) { 7113 // C and C++ allow for main to automagically return 0. 7114 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7115 FD->setHasImplicitReturnZero(true); 7116 WP.disableCheckFallThrough(); 7117 } else if (FD->hasAttr<NakedAttr>()) { 7118 // If the function is marked 'naked', don't complain about missing return 7119 // statements. 7120 WP.disableCheckFallThrough(); 7121 } 7122 7123 // MSVC permits the use of pure specifier (=0) on function definition, 7124 // defined at class scope, warn about this non standard construct. 7125 if (getLangOptions().MicrosoftExt && FD->isPure()) 7126 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7127 7128 if (!FD->isInvalidDecl()) { 7129 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7130 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7131 FD->getResultType(), FD); 7132 7133 // If this is a constructor, we need a vtable. 7134 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7135 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7136 7137 computeNRVO(Body, getCurFunction()); 7138 } 7139 7140 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7141 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7142 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7143 MD->setBody(Body); 7144 if (Body) 7145 MD->setEndLoc(Body->getLocEnd()); 7146 if (!MD->isInvalidDecl()) { 7147 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7148 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7149 MD->getResultType(), MD); 7150 7151 if (Body) 7152 computeNRVO(Body, getCurFunction()); 7153 } 7154 if (ObjCShouldCallSuperDealloc) { 7155 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7156 ObjCShouldCallSuperDealloc = false; 7157 } 7158 if (ObjCShouldCallSuperFinalize) { 7159 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7160 ObjCShouldCallSuperFinalize = false; 7161 } 7162 } else { 7163 return 0; 7164 } 7165 7166 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7167 "ObjC methods, which should have been handled in the block above."); 7168 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7169 "ObjC methods, which should have been handled in the block above."); 7170 7171 // Verify and clean out per-function state. 7172 if (Body) { 7173 // C++ constructors that have function-try-blocks can't have return 7174 // statements in the handlers of that block. (C++ [except.handle]p14) 7175 // Verify this. 7176 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7177 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7178 7179 // Verify that gotos and switch cases don't jump into scopes illegally. 7180 if (getCurFunction()->NeedsScopeChecking() && 7181 !dcl->isInvalidDecl() && 7182 !hasAnyUnrecoverableErrorsInThisFunction()) 7183 DiagnoseInvalidJumps(Body); 7184 7185 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7186 if (!Destructor->getParent()->isDependentType()) 7187 CheckDestructor(Destructor); 7188 7189 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7190 Destructor->getParent()); 7191 } 7192 7193 // If any errors have occurred, clear out any temporaries that may have 7194 // been leftover. This ensures that these temporaries won't be picked up for 7195 // deletion in some later function. 7196 if (PP.getDiagnostics().hasErrorOccurred() || 7197 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7198 DiscardCleanupsInEvaluationContext(); 7199 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7200 // Since the body is valid, issue any analysis-based warnings that are 7201 // enabled. 7202 ActivePolicy = &WP; 7203 } 7204 7205 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7206 !CheckConstexprFunctionBody(FD, Body)) 7207 FD->setInvalidDecl(); 7208 7209 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7210 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7211 } 7212 7213 if (!IsInstantiation) 7214 PopDeclContext(); 7215 7216 PopFunctionScopeInfo(ActivePolicy, dcl); 7217 7218 // If any errors have occurred, clear out any temporaries that may have 7219 // been leftover. This ensures that these temporaries won't be picked up for 7220 // deletion in some later function. 7221 if (getDiagnostics().hasErrorOccurred()) { 7222 DiscardCleanupsInEvaluationContext(); 7223 } 7224 7225 return dcl; 7226} 7227 7228 7229/// When we finish delayed parsing of an attribute, we must attach it to the 7230/// relevant Decl. 7231void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7232 ParsedAttributes &Attrs) { 7233 ProcessDeclAttributeList(S, D, Attrs.getList()); 7234} 7235 7236 7237/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7238/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7239NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7240 IdentifierInfo &II, Scope *S) { 7241 // Before we produce a declaration for an implicitly defined 7242 // function, see whether there was a locally-scoped declaration of 7243 // this name as a function or variable. If so, use that 7244 // (non-visible) declaration, and complain about it. 7245 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7246 = findLocallyScopedExternalDecl(&II); 7247 if (Pos != LocallyScopedExternalDecls.end()) { 7248 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7249 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7250 return Pos->second; 7251 } 7252 7253 // Extension in C99. Legal in C90, but warn about it. 7254 unsigned diag_id; 7255 if (II.getName().startswith("__builtin_")) 7256 diag_id = diag::err_builtin_unknown; 7257 else if (getLangOptions().C99) 7258 diag_id = diag::ext_implicit_function_decl; 7259 else 7260 diag_id = diag::warn_implicit_function_decl; 7261 Diag(Loc, diag_id) << &II; 7262 7263 // Because typo correction is expensive, only do it if the implicit 7264 // function declaration is going to be treated as an error. 7265 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7266 TypoCorrection Corrected; 7267 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7268 LookupOrdinaryName, S, 0))) { 7269 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7270 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7271 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7272 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7273 7274 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7275 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7276 7277 if (Func->getLocation().isValid() 7278 && !II.getName().startswith("__builtin_")) 7279 Diag(Func->getLocation(), diag::note_previous_decl) 7280 << CorrectedQuotedStr; 7281 } 7282 } 7283 } 7284 7285 // Set a Declarator for the implicit definition: int foo(); 7286 const char *Dummy; 7287 AttributeFactory attrFactory; 7288 DeclSpec DS(attrFactory); 7289 unsigned DiagID; 7290 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7291 (void)Error; // Silence warning. 7292 assert(!Error && "Error setting up implicit decl!"); 7293 Declarator D(DS, Declarator::BlockContext); 7294 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7295 0, 0, true, SourceLocation(), 7296 SourceLocation(), SourceLocation(), 7297 SourceLocation(), 7298 EST_None, SourceLocation(), 7299 0, 0, 0, 0, Loc, Loc, D), 7300 DS.getAttributes(), 7301 SourceLocation()); 7302 D.SetIdentifier(&II, Loc); 7303 7304 // Insert this function into translation-unit scope. 7305 7306 DeclContext *PrevDC = CurContext; 7307 CurContext = Context.getTranslationUnitDecl(); 7308 7309 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7310 FD->setImplicit(); 7311 7312 CurContext = PrevDC; 7313 7314 AddKnownFunctionAttributes(FD); 7315 7316 return FD; 7317} 7318 7319/// \brief Adds any function attributes that we know a priori based on 7320/// the declaration of this function. 7321/// 7322/// These attributes can apply both to implicitly-declared builtins 7323/// (like __builtin___printf_chk) or to library-declared functions 7324/// like NSLog or printf. 7325/// 7326/// We need to check for duplicate attributes both here and where user-written 7327/// attributes are applied to declarations. 7328void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7329 if (FD->isInvalidDecl()) 7330 return; 7331 7332 // If this is a built-in function, map its builtin attributes to 7333 // actual attributes. 7334 if (unsigned BuiltinID = FD->getBuiltinID()) { 7335 // Handle printf-formatting attributes. 7336 unsigned FormatIdx; 7337 bool HasVAListArg; 7338 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7339 if (!FD->getAttr<FormatAttr>()) 7340 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7341 "printf", FormatIdx+1, 7342 HasVAListArg ? 0 : FormatIdx+2)); 7343 } 7344 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7345 HasVAListArg)) { 7346 if (!FD->getAttr<FormatAttr>()) 7347 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7348 "scanf", FormatIdx+1, 7349 HasVAListArg ? 0 : FormatIdx+2)); 7350 } 7351 7352 // Mark const if we don't care about errno and that is the only 7353 // thing preventing the function from being const. This allows 7354 // IRgen to use LLVM intrinsics for such functions. 7355 if (!getLangOptions().MathErrno && 7356 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7357 if (!FD->getAttr<ConstAttr>()) 7358 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7359 } 7360 7361 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7362 !FD->getAttr<ReturnsTwiceAttr>()) 7363 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7364 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7365 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7366 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7367 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7368 } 7369 7370 IdentifierInfo *Name = FD->getIdentifier(); 7371 if (!Name) 7372 return; 7373 if ((!getLangOptions().CPlusPlus && 7374 FD->getDeclContext()->isTranslationUnit()) || 7375 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7376 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7377 LinkageSpecDecl::lang_c)) { 7378 // Okay: this could be a libc/libm/Objective-C function we know 7379 // about. 7380 } else 7381 return; 7382 7383 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7384 // FIXME: NSLog and NSLogv should be target specific 7385 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7386 // FIXME: We known better than our headers. 7387 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7388 } else 7389 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7390 "printf", 1, 7391 Name->isStr("NSLogv") ? 0 : 2)); 7392 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7393 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7394 // target-specific builtins, perhaps? 7395 if (!FD->getAttr<FormatAttr>()) 7396 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7397 "printf", 2, 7398 Name->isStr("vasprintf") ? 0 : 3)); 7399 } 7400} 7401 7402TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7403 TypeSourceInfo *TInfo) { 7404 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7405 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7406 7407 if (!TInfo) { 7408 assert(D.isInvalidType() && "no declarator info for valid type"); 7409 TInfo = Context.getTrivialTypeSourceInfo(T); 7410 } 7411 7412 // Scope manipulation handled by caller. 7413 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7414 D.getSourceRange().getBegin(), 7415 D.getIdentifierLoc(), 7416 D.getIdentifier(), 7417 TInfo); 7418 7419 // Bail out immediately if we have an invalid declaration. 7420 if (D.isInvalidType()) { 7421 NewTD->setInvalidDecl(); 7422 return NewTD; 7423 } 7424 7425 if (D.getDeclSpec().isModulePrivateSpecified()) { 7426 if (CurContext->isFunctionOrMethod()) 7427 Diag(NewTD->getLocation(), diag::err_module_private_local) 7428 << 2 << NewTD->getDeclName() 7429 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7430 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7431 else 7432 NewTD->setModulePrivate(); 7433 } 7434 7435 // C++ [dcl.typedef]p8: 7436 // If the typedef declaration defines an unnamed class (or 7437 // enum), the first typedef-name declared by the declaration 7438 // to be that class type (or enum type) is used to denote the 7439 // class type (or enum type) for linkage purposes only. 7440 // We need to check whether the type was declared in the declaration. 7441 switch (D.getDeclSpec().getTypeSpecType()) { 7442 case TST_enum: 7443 case TST_struct: 7444 case TST_union: 7445 case TST_class: { 7446 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7447 7448 // Do nothing if the tag is not anonymous or already has an 7449 // associated typedef (from an earlier typedef in this decl group). 7450 if (tagFromDeclSpec->getIdentifier()) break; 7451 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7452 7453 // A well-formed anonymous tag must always be a TUK_Definition. 7454 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7455 7456 // The type must match the tag exactly; no qualifiers allowed. 7457 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7458 break; 7459 7460 // Otherwise, set this is the anon-decl typedef for the tag. 7461 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7462 break; 7463 } 7464 7465 default: 7466 break; 7467 } 7468 7469 return NewTD; 7470} 7471 7472 7473/// \brief Determine whether a tag with a given kind is acceptable 7474/// as a redeclaration of the given tag declaration. 7475/// 7476/// \returns true if the new tag kind is acceptable, false otherwise. 7477bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7478 TagTypeKind NewTag, bool isDefinition, 7479 SourceLocation NewTagLoc, 7480 const IdentifierInfo &Name) { 7481 // C++ [dcl.type.elab]p3: 7482 // The class-key or enum keyword present in the 7483 // elaborated-type-specifier shall agree in kind with the 7484 // declaration to which the name in the elaborated-type-specifier 7485 // refers. This rule also applies to the form of 7486 // elaborated-type-specifier that declares a class-name or 7487 // friend class since it can be construed as referring to the 7488 // definition of the class. Thus, in any 7489 // elaborated-type-specifier, the enum keyword shall be used to 7490 // refer to an enumeration (7.2), the union class-key shall be 7491 // used to refer to a union (clause 9), and either the class or 7492 // struct class-key shall be used to refer to a class (clause 9) 7493 // declared using the class or struct class-key. 7494 TagTypeKind OldTag = Previous->getTagKind(); 7495 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7496 if (OldTag == NewTag) 7497 return true; 7498 7499 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7500 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7501 // Warn about the struct/class tag mismatch. 7502 bool isTemplate = false; 7503 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7504 isTemplate = Record->getDescribedClassTemplate(); 7505 7506 if (!ActiveTemplateInstantiations.empty()) { 7507 // In a template instantiation, do not offer fix-its for tag mismatches 7508 // since they usually mess up the template instead of fixing the problem. 7509 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7510 << (NewTag == TTK_Class) << isTemplate << &Name; 7511 return true; 7512 } 7513 7514 if (isDefinition) { 7515 // On definitions, check previous tags and issue a fix-it for each 7516 // one that doesn't match the current tag. 7517 if (Previous->getDefinition()) { 7518 // Don't suggest fix-its for redefinitions. 7519 return true; 7520 } 7521 7522 bool previousMismatch = false; 7523 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7524 E(Previous->redecls_end()); I != E; ++I) { 7525 if (I->getTagKind() != NewTag) { 7526 if (!previousMismatch) { 7527 previousMismatch = true; 7528 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7529 << (NewTag == TTK_Class) << isTemplate << &Name; 7530 } 7531 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7532 << (NewTag == TTK_Class) 7533 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7534 NewTag == TTK_Class? 7535 "class" : "struct"); 7536 } 7537 } 7538 return true; 7539 } 7540 7541 // Check for a previous definition. If current tag and definition 7542 // are same type, do nothing. If no definition, but disagree with 7543 // with previous tag type, give a warning, but no fix-it. 7544 const TagDecl *Redecl = Previous->getDefinition() ? 7545 Previous->getDefinition() : Previous; 7546 if (Redecl->getTagKind() == NewTag) { 7547 return true; 7548 } 7549 7550 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7551 << (NewTag == TTK_Class) 7552 << isTemplate << &Name; 7553 Diag(Redecl->getLocation(), diag::note_previous_use); 7554 7555 // If there is a previous defintion, suggest a fix-it. 7556 if (Previous->getDefinition()) { 7557 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7558 << (Redecl->getTagKind() == TTK_Class) 7559 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7560 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7561 } 7562 7563 return true; 7564 } 7565 return false; 7566} 7567 7568/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7569/// former case, Name will be non-null. In the later case, Name will be null. 7570/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7571/// reference/declaration/definition of a tag. 7572Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7573 SourceLocation KWLoc, CXXScopeSpec &SS, 7574 IdentifierInfo *Name, SourceLocation NameLoc, 7575 AttributeList *Attr, AccessSpecifier AS, 7576 SourceLocation ModulePrivateLoc, 7577 MultiTemplateParamsArg TemplateParameterLists, 7578 bool &OwnedDecl, bool &IsDependent, 7579 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7580 TypeResult UnderlyingType) { 7581 // If this is not a definition, it must have a name. 7582 assert((Name != 0 || TUK == TUK_Definition) && 7583 "Nameless record must be a definition!"); 7584 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7585 7586 OwnedDecl = false; 7587 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7588 7589 // FIXME: Check explicit specializations more carefully. 7590 bool isExplicitSpecialization = false; 7591 bool Invalid = false; 7592 7593 // We only need to do this matching if we have template parameters 7594 // or a scope specifier, which also conveniently avoids this work 7595 // for non-C++ cases. 7596 if (TemplateParameterLists.size() > 0 || 7597 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7598 if (TemplateParameterList *TemplateParams 7599 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7600 TemplateParameterLists.get(), 7601 TemplateParameterLists.size(), 7602 TUK == TUK_Friend, 7603 isExplicitSpecialization, 7604 Invalid)) { 7605 if (TemplateParams->size() > 0) { 7606 // This is a declaration or definition of a class template (which may 7607 // be a member of another template). 7608 7609 if (Invalid) 7610 return 0; 7611 7612 OwnedDecl = false; 7613 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7614 SS, Name, NameLoc, Attr, 7615 TemplateParams, AS, 7616 ModulePrivateLoc, 7617 TemplateParameterLists.size() - 1, 7618 (TemplateParameterList**) TemplateParameterLists.release()); 7619 return Result.get(); 7620 } else { 7621 // The "template<>" header is extraneous. 7622 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7623 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7624 isExplicitSpecialization = true; 7625 } 7626 } 7627 } 7628 7629 // Figure out the underlying type if this a enum declaration. We need to do 7630 // this early, because it's needed to detect if this is an incompatible 7631 // redeclaration. 7632 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7633 7634 if (Kind == TTK_Enum) { 7635 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7636 // No underlying type explicitly specified, or we failed to parse the 7637 // type, default to int. 7638 EnumUnderlying = Context.IntTy.getTypePtr(); 7639 else if (UnderlyingType.get()) { 7640 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7641 // integral type; any cv-qualification is ignored. 7642 TypeSourceInfo *TI = 0; 7643 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7644 EnumUnderlying = TI; 7645 7646 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7647 7648 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7649 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7650 << T; 7651 // Recover by falling back to int. 7652 EnumUnderlying = Context.IntTy.getTypePtr(); 7653 } 7654 7655 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7656 UPPC_FixedUnderlyingType)) 7657 EnumUnderlying = Context.IntTy.getTypePtr(); 7658 7659 } else if (getLangOptions().MicrosoftExt) 7660 // Microsoft enums are always of int type. 7661 EnumUnderlying = Context.IntTy.getTypePtr(); 7662 } 7663 7664 DeclContext *SearchDC = CurContext; 7665 DeclContext *DC = CurContext; 7666 bool isStdBadAlloc = false; 7667 7668 RedeclarationKind Redecl = ForRedeclaration; 7669 if (TUK == TUK_Friend || TUK == TUK_Reference) 7670 Redecl = NotForRedeclaration; 7671 7672 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7673 7674 if (Name && SS.isNotEmpty()) { 7675 // We have a nested-name tag ('struct foo::bar'). 7676 7677 // Check for invalid 'foo::'. 7678 if (SS.isInvalid()) { 7679 Name = 0; 7680 goto CreateNewDecl; 7681 } 7682 7683 // If this is a friend or a reference to a class in a dependent 7684 // context, don't try to make a decl for it. 7685 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7686 DC = computeDeclContext(SS, false); 7687 if (!DC) { 7688 IsDependent = true; 7689 return 0; 7690 } 7691 } else { 7692 DC = computeDeclContext(SS, true); 7693 if (!DC) { 7694 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7695 << SS.getRange(); 7696 return 0; 7697 } 7698 } 7699 7700 if (RequireCompleteDeclContext(SS, DC)) 7701 return 0; 7702 7703 SearchDC = DC; 7704 // Look-up name inside 'foo::'. 7705 LookupQualifiedName(Previous, DC); 7706 7707 if (Previous.isAmbiguous()) 7708 return 0; 7709 7710 if (Previous.empty()) { 7711 // Name lookup did not find anything. However, if the 7712 // nested-name-specifier refers to the current instantiation, 7713 // and that current instantiation has any dependent base 7714 // classes, we might find something at instantiation time: treat 7715 // this as a dependent elaborated-type-specifier. 7716 // But this only makes any sense for reference-like lookups. 7717 if (Previous.wasNotFoundInCurrentInstantiation() && 7718 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7719 IsDependent = true; 7720 return 0; 7721 } 7722 7723 // A tag 'foo::bar' must already exist. 7724 Diag(NameLoc, diag::err_not_tag_in_scope) 7725 << Kind << Name << DC << SS.getRange(); 7726 Name = 0; 7727 Invalid = true; 7728 goto CreateNewDecl; 7729 } 7730 } else if (Name) { 7731 // If this is a named struct, check to see if there was a previous forward 7732 // declaration or definition. 7733 // FIXME: We're looking into outer scopes here, even when we 7734 // shouldn't be. Doing so can result in ambiguities that we 7735 // shouldn't be diagnosing. 7736 LookupName(Previous, S); 7737 7738 if (Previous.isAmbiguous() && 7739 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7740 LookupResult::Filter F = Previous.makeFilter(); 7741 while (F.hasNext()) { 7742 NamedDecl *ND = F.next(); 7743 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7744 F.erase(); 7745 } 7746 F.done(); 7747 } 7748 7749 // Note: there used to be some attempt at recovery here. 7750 if (Previous.isAmbiguous()) 7751 return 0; 7752 7753 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7754 // FIXME: This makes sure that we ignore the contexts associated 7755 // with C structs, unions, and enums when looking for a matching 7756 // tag declaration or definition. See the similar lookup tweak 7757 // in Sema::LookupName; is there a better way to deal with this? 7758 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7759 SearchDC = SearchDC->getParent(); 7760 } 7761 } else if (S->isFunctionPrototypeScope()) { 7762 // If this is an enum declaration in function prototype scope, set its 7763 // initial context to the translation unit. 7764 SearchDC = Context.getTranslationUnitDecl(); 7765 } 7766 7767 if (Previous.isSingleResult() && 7768 Previous.getFoundDecl()->isTemplateParameter()) { 7769 // Maybe we will complain about the shadowed template parameter. 7770 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7771 // Just pretend that we didn't see the previous declaration. 7772 Previous.clear(); 7773 } 7774 7775 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7776 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7777 // This is a declaration of or a reference to "std::bad_alloc". 7778 isStdBadAlloc = true; 7779 7780 if (Previous.empty() && StdBadAlloc) { 7781 // std::bad_alloc has been implicitly declared (but made invisible to 7782 // name lookup). Fill in this implicit declaration as the previous 7783 // declaration, so that the declarations get chained appropriately. 7784 Previous.addDecl(getStdBadAlloc()); 7785 } 7786 } 7787 7788 // If we didn't find a previous declaration, and this is a reference 7789 // (or friend reference), move to the correct scope. In C++, we 7790 // also need to do a redeclaration lookup there, just in case 7791 // there's a shadow friend decl. 7792 if (Name && Previous.empty() && 7793 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7794 if (Invalid) goto CreateNewDecl; 7795 assert(SS.isEmpty()); 7796 7797 if (TUK == TUK_Reference) { 7798 // C++ [basic.scope.pdecl]p5: 7799 // -- for an elaborated-type-specifier of the form 7800 // 7801 // class-key identifier 7802 // 7803 // if the elaborated-type-specifier is used in the 7804 // decl-specifier-seq or parameter-declaration-clause of a 7805 // function defined in namespace scope, the identifier is 7806 // declared as a class-name in the namespace that contains 7807 // the declaration; otherwise, except as a friend 7808 // declaration, the identifier is declared in the smallest 7809 // non-class, non-function-prototype scope that contains the 7810 // declaration. 7811 // 7812 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7813 // C structs and unions. 7814 // 7815 // It is an error in C++ to declare (rather than define) an enum 7816 // type, including via an elaborated type specifier. We'll 7817 // diagnose that later; for now, declare the enum in the same 7818 // scope as we would have picked for any other tag type. 7819 // 7820 // GNU C also supports this behavior as part of its incomplete 7821 // enum types extension, while GNU C++ does not. 7822 // 7823 // Find the context where we'll be declaring the tag. 7824 // FIXME: We would like to maintain the current DeclContext as the 7825 // lexical context, 7826 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7827 SearchDC = SearchDC->getParent(); 7828 7829 // Find the scope where we'll be declaring the tag. 7830 while (S->isClassScope() || 7831 (getLangOptions().CPlusPlus && 7832 S->isFunctionPrototypeScope()) || 7833 ((S->getFlags() & Scope::DeclScope) == 0) || 7834 (S->getEntity() && 7835 ((DeclContext *)S->getEntity())->isTransparentContext())) 7836 S = S->getParent(); 7837 } else { 7838 assert(TUK == TUK_Friend); 7839 // C++ [namespace.memdef]p3: 7840 // If a friend declaration in a non-local class first declares a 7841 // class or function, the friend class or function is a member of 7842 // the innermost enclosing namespace. 7843 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7844 } 7845 7846 // In C++, we need to do a redeclaration lookup to properly 7847 // diagnose some problems. 7848 if (getLangOptions().CPlusPlus) { 7849 Previous.setRedeclarationKind(ForRedeclaration); 7850 LookupQualifiedName(Previous, SearchDC); 7851 } 7852 } 7853 7854 if (!Previous.empty()) { 7855 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7856 7857 // It's okay to have a tag decl in the same scope as a typedef 7858 // which hides a tag decl in the same scope. Finding this 7859 // insanity with a redeclaration lookup can only actually happen 7860 // in C++. 7861 // 7862 // This is also okay for elaborated-type-specifiers, which is 7863 // technically forbidden by the current standard but which is 7864 // okay according to the likely resolution of an open issue; 7865 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7866 if (getLangOptions().CPlusPlus) { 7867 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7868 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7869 TagDecl *Tag = TT->getDecl(); 7870 if (Tag->getDeclName() == Name && 7871 Tag->getDeclContext()->getRedeclContext() 7872 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7873 PrevDecl = Tag; 7874 Previous.clear(); 7875 Previous.addDecl(Tag); 7876 Previous.resolveKind(); 7877 } 7878 } 7879 } 7880 } 7881 7882 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7883 // If this is a use of a previous tag, or if the tag is already declared 7884 // in the same scope (so that the definition/declaration completes or 7885 // rementions the tag), reuse the decl. 7886 if (TUK == TUK_Reference || TUK == TUK_Friend || 7887 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7888 // Make sure that this wasn't declared as an enum and now used as a 7889 // struct or something similar. 7890 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7891 TUK == TUK_Definition, KWLoc, 7892 *Name)) { 7893 bool SafeToContinue 7894 = (PrevTagDecl->getTagKind() != TTK_Enum && 7895 Kind != TTK_Enum); 7896 if (SafeToContinue) 7897 Diag(KWLoc, diag::err_use_with_wrong_tag) 7898 << Name 7899 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7900 PrevTagDecl->getKindName()); 7901 else 7902 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7903 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7904 7905 if (SafeToContinue) 7906 Kind = PrevTagDecl->getTagKind(); 7907 else { 7908 // Recover by making this an anonymous redefinition. 7909 Name = 0; 7910 Previous.clear(); 7911 Invalid = true; 7912 } 7913 } 7914 7915 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7916 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7917 7918 // All conflicts with previous declarations are recovered by 7919 // returning the previous declaration. 7920 if (ScopedEnum != PrevEnum->isScoped()) { 7921 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7922 << PrevEnum->isScoped(); 7923 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7924 return PrevTagDecl; 7925 } 7926 else if (EnumUnderlying && PrevEnum->isFixed()) { 7927 QualType T; 7928 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7929 T = TI->getType(); 7930 else 7931 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7932 7933 if (!Context.hasSameUnqualifiedType(T, 7934 PrevEnum->getIntegerType())) { 7935 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7936 diag::err_enum_redeclare_type_mismatch) 7937 << T 7938 << PrevEnum->getIntegerType(); 7939 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7940 return PrevTagDecl; 7941 } 7942 } 7943 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7944 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7945 << PrevEnum->isFixed(); 7946 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7947 return PrevTagDecl; 7948 } 7949 } 7950 7951 if (!Invalid) { 7952 // If this is a use, just return the declaration we found. 7953 7954 // FIXME: In the future, return a variant or some other clue 7955 // for the consumer of this Decl to know it doesn't own it. 7956 // For our current ASTs this shouldn't be a problem, but will 7957 // need to be changed with DeclGroups. 7958 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7959 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7960 return PrevTagDecl; 7961 7962 // Diagnose attempts to redefine a tag. 7963 if (TUK == TUK_Definition) { 7964 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7965 // If we're defining a specialization and the previous definition 7966 // is from an implicit instantiation, don't emit an error 7967 // here; we'll catch this in the general case below. 7968 if (!isExplicitSpecialization || 7969 !isa<CXXRecordDecl>(Def) || 7970 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7971 == TSK_ExplicitSpecialization) { 7972 Diag(NameLoc, diag::err_redefinition) << Name; 7973 Diag(Def->getLocation(), diag::note_previous_definition); 7974 // If this is a redefinition, recover by making this 7975 // struct be anonymous, which will make any later 7976 // references get the previous definition. 7977 Name = 0; 7978 Previous.clear(); 7979 Invalid = true; 7980 } 7981 } else { 7982 // If the type is currently being defined, complain 7983 // about a nested redefinition. 7984 const TagType *Tag 7985 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7986 if (Tag->isBeingDefined()) { 7987 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7988 Diag(PrevTagDecl->getLocation(), 7989 diag::note_previous_definition); 7990 Name = 0; 7991 Previous.clear(); 7992 Invalid = true; 7993 } 7994 } 7995 7996 // Okay, this is definition of a previously declared or referenced 7997 // tag PrevDecl. We're going to create a new Decl for it. 7998 } 7999 } 8000 // If we get here we have (another) forward declaration or we 8001 // have a definition. Just create a new decl. 8002 8003 } else { 8004 // If we get here, this is a definition of a new tag type in a nested 8005 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8006 // new decl/type. We set PrevDecl to NULL so that the entities 8007 // have distinct types. 8008 Previous.clear(); 8009 } 8010 // If we get here, we're going to create a new Decl. If PrevDecl 8011 // is non-NULL, it's a definition of the tag declared by 8012 // PrevDecl. If it's NULL, we have a new definition. 8013 8014 8015 // Otherwise, PrevDecl is not a tag, but was found with tag 8016 // lookup. This is only actually possible in C++, where a few 8017 // things like templates still live in the tag namespace. 8018 } else { 8019 // Use a better diagnostic if an elaborated-type-specifier 8020 // found the wrong kind of type on the first 8021 // (non-redeclaration) lookup. 8022 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8023 !Previous.isForRedeclaration()) { 8024 unsigned Kind = 0; 8025 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8026 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8027 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8028 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8029 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8030 Invalid = true; 8031 8032 // Otherwise, only diagnose if the declaration is in scope. 8033 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8034 isExplicitSpecialization)) { 8035 // do nothing 8036 8037 // Diagnose implicit declarations introduced by elaborated types. 8038 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8039 unsigned Kind = 0; 8040 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8041 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8042 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8043 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8044 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8045 Invalid = true; 8046 8047 // Otherwise it's a declaration. Call out a particularly common 8048 // case here. 8049 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8050 unsigned Kind = 0; 8051 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8052 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8053 << Name << Kind << TND->getUnderlyingType(); 8054 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8055 Invalid = true; 8056 8057 // Otherwise, diagnose. 8058 } else { 8059 // The tag name clashes with something else in the target scope, 8060 // issue an error and recover by making this tag be anonymous. 8061 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8062 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8063 Name = 0; 8064 Invalid = true; 8065 } 8066 8067 // The existing declaration isn't relevant to us; we're in a 8068 // new scope, so clear out the previous declaration. 8069 Previous.clear(); 8070 } 8071 } 8072 8073CreateNewDecl: 8074 8075 TagDecl *PrevDecl = 0; 8076 if (Previous.isSingleResult()) 8077 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8078 8079 // If there is an identifier, use the location of the identifier as the 8080 // location of the decl, otherwise use the location of the struct/union 8081 // keyword. 8082 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8083 8084 // Otherwise, create a new declaration. If there is a previous 8085 // declaration of the same entity, the two will be linked via 8086 // PrevDecl. 8087 TagDecl *New; 8088 8089 bool IsForwardReference = false; 8090 if (Kind == TTK_Enum) { 8091 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8092 // enum X { A, B, C } D; D should chain to X. 8093 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8094 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8095 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8096 // If this is an undefined enum, warn. 8097 if (TUK != TUK_Definition && !Invalid) { 8098 TagDecl *Def; 8099 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8100 // C++0x: 7.2p2: opaque-enum-declaration. 8101 // Conflicts are diagnosed above. Do nothing. 8102 } 8103 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8104 Diag(Loc, diag::ext_forward_ref_enum_def) 8105 << New; 8106 Diag(Def->getLocation(), diag::note_previous_definition); 8107 } else { 8108 unsigned DiagID = diag::ext_forward_ref_enum; 8109 if (getLangOptions().MicrosoftExt) 8110 DiagID = diag::ext_ms_forward_ref_enum; 8111 else if (getLangOptions().CPlusPlus) 8112 DiagID = diag::err_forward_ref_enum; 8113 Diag(Loc, DiagID); 8114 8115 // If this is a forward-declared reference to an enumeration, make a 8116 // note of it; we won't actually be introducing the declaration into 8117 // the declaration context. 8118 if (TUK == TUK_Reference) 8119 IsForwardReference = true; 8120 } 8121 } 8122 8123 if (EnumUnderlying) { 8124 EnumDecl *ED = cast<EnumDecl>(New); 8125 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8126 ED->setIntegerTypeSourceInfo(TI); 8127 else 8128 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8129 ED->setPromotionType(ED->getIntegerType()); 8130 } 8131 8132 } else { 8133 // struct/union/class 8134 8135 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8136 // struct X { int A; } D; D should chain to X. 8137 if (getLangOptions().CPlusPlus) { 8138 // FIXME: Look for a way to use RecordDecl for simple structs. 8139 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8140 cast_or_null<CXXRecordDecl>(PrevDecl)); 8141 8142 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8143 StdBadAlloc = cast<CXXRecordDecl>(New); 8144 } else 8145 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8146 cast_or_null<RecordDecl>(PrevDecl)); 8147 } 8148 8149 // Maybe add qualifier info. 8150 if (SS.isNotEmpty()) { 8151 if (SS.isSet()) { 8152 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8153 if (TemplateParameterLists.size() > 0) { 8154 New->setTemplateParameterListsInfo(Context, 8155 TemplateParameterLists.size(), 8156 (TemplateParameterList**) TemplateParameterLists.release()); 8157 } 8158 } 8159 else 8160 Invalid = true; 8161 } 8162 8163 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8164 // Add alignment attributes if necessary; these attributes are checked when 8165 // the ASTContext lays out the structure. 8166 // 8167 // It is important for implementing the correct semantics that this 8168 // happen here (in act on tag decl). The #pragma pack stack is 8169 // maintained as a result of parser callbacks which can occur at 8170 // many points during the parsing of a struct declaration (because 8171 // the #pragma tokens are effectively skipped over during the 8172 // parsing of the struct). 8173 AddAlignmentAttributesForRecord(RD); 8174 8175 AddMsStructLayoutForRecord(RD); 8176 } 8177 8178 if (ModulePrivateLoc.isValid()) { 8179 if (isExplicitSpecialization) 8180 Diag(New->getLocation(), diag::err_module_private_specialization) 8181 << 2 8182 << FixItHint::CreateRemoval(ModulePrivateLoc); 8183 // __module_private__ does not apply to local classes. However, we only 8184 // diagnose this as an error when the declaration specifiers are 8185 // freestanding. Here, we just ignore the __module_private__. 8186 else if (!SearchDC->isFunctionOrMethod()) 8187 New->setModulePrivate(); 8188 } 8189 8190 // If this is a specialization of a member class (of a class template), 8191 // check the specialization. 8192 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8193 Invalid = true; 8194 8195 if (Invalid) 8196 New->setInvalidDecl(); 8197 8198 if (Attr) 8199 ProcessDeclAttributeList(S, New, Attr); 8200 8201 // If we're declaring or defining a tag in function prototype scope 8202 // in C, note that this type can only be used within the function. 8203 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8204 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8205 8206 // Set the lexical context. If the tag has a C++ scope specifier, the 8207 // lexical context will be different from the semantic context. 8208 New->setLexicalDeclContext(CurContext); 8209 8210 // Mark this as a friend decl if applicable. 8211 // In Microsoft mode, a friend declaration also acts as a forward 8212 // declaration so we always pass true to setObjectOfFriendDecl to make 8213 // the tag name visible. 8214 if (TUK == TUK_Friend) 8215 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8216 getLangOptions().MicrosoftExt); 8217 8218 // Set the access specifier. 8219 if (!Invalid && SearchDC->isRecord()) 8220 SetMemberAccessSpecifier(New, PrevDecl, AS); 8221 8222 if (TUK == TUK_Definition) 8223 New->startDefinition(); 8224 8225 // If this has an identifier, add it to the scope stack. 8226 if (TUK == TUK_Friend) { 8227 // We might be replacing an existing declaration in the lookup tables; 8228 // if so, borrow its access specifier. 8229 if (PrevDecl) 8230 New->setAccess(PrevDecl->getAccess()); 8231 8232 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8233 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8234 if (Name) // can be null along some error paths 8235 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8236 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8237 } else if (Name) { 8238 S = getNonFieldDeclScope(S); 8239 PushOnScopeChains(New, S, !IsForwardReference); 8240 if (IsForwardReference) 8241 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8242 8243 } else { 8244 CurContext->addDecl(New); 8245 } 8246 8247 // If this is the C FILE type, notify the AST context. 8248 if (IdentifierInfo *II = New->getIdentifier()) 8249 if (!New->isInvalidDecl() && 8250 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8251 II->isStr("FILE")) 8252 Context.setFILEDecl(New); 8253 8254 OwnedDecl = true; 8255 return New; 8256} 8257 8258void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8259 AdjustDeclIfTemplate(TagD); 8260 TagDecl *Tag = cast<TagDecl>(TagD); 8261 8262 // Enter the tag context. 8263 PushDeclContext(S, Tag); 8264} 8265 8266Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8267 assert(isa<ObjCContainerDecl>(IDecl) && 8268 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8269 DeclContext *OCD = cast<DeclContext>(IDecl); 8270 assert(getContainingDC(OCD) == CurContext && 8271 "The next DeclContext should be lexically contained in the current one."); 8272 CurContext = OCD; 8273 return IDecl; 8274} 8275 8276void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8277 SourceLocation FinalLoc, 8278 SourceLocation LBraceLoc) { 8279 AdjustDeclIfTemplate(TagD); 8280 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8281 8282 FieldCollector->StartClass(); 8283 8284 if (!Record->getIdentifier()) 8285 return; 8286 8287 if (FinalLoc.isValid()) 8288 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8289 8290 // C++ [class]p2: 8291 // [...] The class-name is also inserted into the scope of the 8292 // class itself; this is known as the injected-class-name. For 8293 // purposes of access checking, the injected-class-name is treated 8294 // as if it were a public member name. 8295 CXXRecordDecl *InjectedClassName 8296 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8297 Record->getLocStart(), Record->getLocation(), 8298 Record->getIdentifier(), 8299 /*PrevDecl=*/0, 8300 /*DelayTypeCreation=*/true); 8301 Context.getTypeDeclType(InjectedClassName, Record); 8302 InjectedClassName->setImplicit(); 8303 InjectedClassName->setAccess(AS_public); 8304 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8305 InjectedClassName->setDescribedClassTemplate(Template); 8306 PushOnScopeChains(InjectedClassName, S); 8307 assert(InjectedClassName->isInjectedClassName() && 8308 "Broken injected-class-name"); 8309} 8310 8311void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8312 SourceLocation RBraceLoc) { 8313 AdjustDeclIfTemplate(TagD); 8314 TagDecl *Tag = cast<TagDecl>(TagD); 8315 Tag->setRBraceLoc(RBraceLoc); 8316 8317 if (isa<CXXRecordDecl>(Tag)) 8318 FieldCollector->FinishClass(); 8319 8320 // Exit this scope of this tag's definition. 8321 PopDeclContext(); 8322 8323 // Notify the consumer that we've defined a tag. 8324 Consumer.HandleTagDeclDefinition(Tag); 8325} 8326 8327void Sema::ActOnObjCContainerFinishDefinition() { 8328 // Exit this scope of this interface definition. 8329 PopDeclContext(); 8330} 8331 8332void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8333 assert(DC == CurContext && "Mismatch of container contexts"); 8334 OriginalLexicalContext = DC; 8335 ActOnObjCContainerFinishDefinition(); 8336} 8337 8338void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8339 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8340 OriginalLexicalContext = 0; 8341} 8342 8343void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8344 AdjustDeclIfTemplate(TagD); 8345 TagDecl *Tag = cast<TagDecl>(TagD); 8346 Tag->setInvalidDecl(); 8347 8348 // We're undoing ActOnTagStartDefinition here, not 8349 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8350 // the FieldCollector. 8351 8352 PopDeclContext(); 8353} 8354 8355// Note that FieldName may be null for anonymous bitfields. 8356bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8357 QualType FieldTy, const Expr *BitWidth, 8358 bool *ZeroWidth) { 8359 // Default to true; that shouldn't confuse checks for emptiness 8360 if (ZeroWidth) 8361 *ZeroWidth = true; 8362 8363 // C99 6.7.2.1p4 - verify the field type. 8364 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8365 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8366 // Handle incomplete types with specific error. 8367 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8368 return true; 8369 if (FieldName) 8370 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8371 << FieldName << FieldTy << BitWidth->getSourceRange(); 8372 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8373 << FieldTy << BitWidth->getSourceRange(); 8374 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8375 UPPC_BitFieldWidth)) 8376 return true; 8377 8378 // If the bit-width is type- or value-dependent, don't try to check 8379 // it now. 8380 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8381 return false; 8382 8383 llvm::APSInt Value; 8384 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8385 return true; 8386 8387 if (Value != 0 && ZeroWidth) 8388 *ZeroWidth = false; 8389 8390 // Zero-width bitfield is ok for anonymous field. 8391 if (Value == 0 && FieldName) 8392 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8393 8394 if (Value.isSigned() && Value.isNegative()) { 8395 if (FieldName) 8396 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8397 << FieldName << Value.toString(10); 8398 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8399 << Value.toString(10); 8400 } 8401 8402 if (!FieldTy->isDependentType()) { 8403 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8404 if (Value.getZExtValue() > TypeSize) { 8405 if (!getLangOptions().CPlusPlus) { 8406 if (FieldName) 8407 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8408 << FieldName << (unsigned)Value.getZExtValue() 8409 << (unsigned)TypeSize; 8410 8411 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8412 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8413 } 8414 8415 if (FieldName) 8416 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8417 << FieldName << (unsigned)Value.getZExtValue() 8418 << (unsigned)TypeSize; 8419 else 8420 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8421 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8422 } 8423 } 8424 8425 return false; 8426} 8427 8428/// ActOnField - Each field of a C struct/union is passed into this in order 8429/// to create a FieldDecl object for it. 8430Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8431 Declarator &D, Expr *BitfieldWidth) { 8432 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8433 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8434 /*HasInit=*/false, AS_public); 8435 return Res; 8436} 8437 8438/// HandleField - Analyze a field of a C struct or a C++ data member. 8439/// 8440FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8441 SourceLocation DeclStart, 8442 Declarator &D, Expr *BitWidth, bool HasInit, 8443 AccessSpecifier AS) { 8444 IdentifierInfo *II = D.getIdentifier(); 8445 SourceLocation Loc = DeclStart; 8446 if (II) Loc = D.getIdentifierLoc(); 8447 8448 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8449 QualType T = TInfo->getType(); 8450 if (getLangOptions().CPlusPlus) { 8451 CheckExtraCXXDefaultArguments(D); 8452 8453 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8454 UPPC_DataMemberType)) { 8455 D.setInvalidType(); 8456 T = Context.IntTy; 8457 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8458 } 8459 } 8460 8461 DiagnoseFunctionSpecifiers(D); 8462 8463 if (D.getDeclSpec().isThreadSpecified()) 8464 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8465 if (D.getDeclSpec().isConstexprSpecified()) 8466 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8467 << 2; 8468 8469 // Check to see if this name was declared as a member previously 8470 NamedDecl *PrevDecl = 0; 8471 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8472 LookupName(Previous, S); 8473 switch (Previous.getResultKind()) { 8474 case LookupResult::Found: 8475 case LookupResult::FoundUnresolvedValue: 8476 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8477 break; 8478 8479 case LookupResult::FoundOverloaded: 8480 PrevDecl = Previous.getRepresentativeDecl(); 8481 break; 8482 8483 case LookupResult::NotFound: 8484 case LookupResult::NotFoundInCurrentInstantiation: 8485 case LookupResult::Ambiguous: 8486 break; 8487 } 8488 Previous.suppressDiagnostics(); 8489 8490 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8491 // Maybe we will complain about the shadowed template parameter. 8492 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8493 // Just pretend that we didn't see the previous declaration. 8494 PrevDecl = 0; 8495 } 8496 8497 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8498 PrevDecl = 0; 8499 8500 bool Mutable 8501 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8502 SourceLocation TSSL = D.getSourceRange().getBegin(); 8503 FieldDecl *NewFD 8504 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8505 TSSL, AS, PrevDecl, &D); 8506 8507 if (NewFD->isInvalidDecl()) 8508 Record->setInvalidDecl(); 8509 8510 if (D.getDeclSpec().isModulePrivateSpecified()) 8511 NewFD->setModulePrivate(); 8512 8513 if (NewFD->isInvalidDecl() && PrevDecl) { 8514 // Don't introduce NewFD into scope; there's already something 8515 // with the same name in the same scope. 8516 } else if (II) { 8517 PushOnScopeChains(NewFD, S); 8518 } else 8519 Record->addDecl(NewFD); 8520 8521 return NewFD; 8522} 8523 8524/// \brief Build a new FieldDecl and check its well-formedness. 8525/// 8526/// This routine builds a new FieldDecl given the fields name, type, 8527/// record, etc. \p PrevDecl should refer to any previous declaration 8528/// with the same name and in the same scope as the field to be 8529/// created. 8530/// 8531/// \returns a new FieldDecl. 8532/// 8533/// \todo The Declarator argument is a hack. It will be removed once 8534FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8535 TypeSourceInfo *TInfo, 8536 RecordDecl *Record, SourceLocation Loc, 8537 bool Mutable, Expr *BitWidth, bool HasInit, 8538 SourceLocation TSSL, 8539 AccessSpecifier AS, NamedDecl *PrevDecl, 8540 Declarator *D) { 8541 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8542 bool InvalidDecl = false; 8543 if (D) InvalidDecl = D->isInvalidType(); 8544 8545 // If we receive a broken type, recover by assuming 'int' and 8546 // marking this declaration as invalid. 8547 if (T.isNull()) { 8548 InvalidDecl = true; 8549 T = Context.IntTy; 8550 } 8551 8552 QualType EltTy = Context.getBaseElementType(T); 8553 if (!EltTy->isDependentType() && 8554 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8555 // Fields of incomplete type force their record to be invalid. 8556 Record->setInvalidDecl(); 8557 InvalidDecl = true; 8558 } 8559 8560 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8561 // than a variably modified type. 8562 if (!InvalidDecl && T->isVariablyModifiedType()) { 8563 bool SizeIsNegative; 8564 llvm::APSInt Oversized; 8565 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8566 SizeIsNegative, 8567 Oversized); 8568 if (!FixedTy.isNull()) { 8569 Diag(Loc, diag::warn_illegal_constant_array_size); 8570 T = FixedTy; 8571 } else { 8572 if (SizeIsNegative) 8573 Diag(Loc, diag::err_typecheck_negative_array_size); 8574 else if (Oversized.getBoolValue()) 8575 Diag(Loc, diag::err_array_too_large) 8576 << Oversized.toString(10); 8577 else 8578 Diag(Loc, diag::err_typecheck_field_variable_size); 8579 InvalidDecl = true; 8580 } 8581 } 8582 8583 // Fields can not have abstract class types 8584 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8585 diag::err_abstract_type_in_decl, 8586 AbstractFieldType)) 8587 InvalidDecl = true; 8588 8589 bool ZeroWidth = false; 8590 // If this is declared as a bit-field, check the bit-field. 8591 if (!InvalidDecl && BitWidth && 8592 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8593 InvalidDecl = true; 8594 BitWidth = 0; 8595 ZeroWidth = false; 8596 } 8597 8598 // Check that 'mutable' is consistent with the type of the declaration. 8599 if (!InvalidDecl && Mutable) { 8600 unsigned DiagID = 0; 8601 if (T->isReferenceType()) 8602 DiagID = diag::err_mutable_reference; 8603 else if (T.isConstQualified()) 8604 DiagID = diag::err_mutable_const; 8605 8606 if (DiagID) { 8607 SourceLocation ErrLoc = Loc; 8608 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8609 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8610 Diag(ErrLoc, DiagID); 8611 Mutable = false; 8612 InvalidDecl = true; 8613 } 8614 } 8615 8616 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8617 BitWidth, Mutable, HasInit); 8618 if (InvalidDecl) 8619 NewFD->setInvalidDecl(); 8620 8621 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8622 Diag(Loc, diag::err_duplicate_member) << II; 8623 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8624 NewFD->setInvalidDecl(); 8625 } 8626 8627 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8628 if (Record->isUnion()) { 8629 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8630 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8631 if (RDecl->getDefinition()) { 8632 // C++ [class.union]p1: An object of a class with a non-trivial 8633 // constructor, a non-trivial copy constructor, a non-trivial 8634 // destructor, or a non-trivial copy assignment operator 8635 // cannot be a member of a union, nor can an array of such 8636 // objects. 8637 if (CheckNontrivialField(NewFD)) 8638 NewFD->setInvalidDecl(); 8639 } 8640 } 8641 8642 // C++ [class.union]p1: If a union contains a member of reference type, 8643 // the program is ill-formed. 8644 if (EltTy->isReferenceType()) { 8645 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8646 << NewFD->getDeclName() << EltTy; 8647 NewFD->setInvalidDecl(); 8648 } 8649 } 8650 } 8651 8652 // FIXME: We need to pass in the attributes given an AST 8653 // representation, not a parser representation. 8654 if (D) 8655 // FIXME: What to pass instead of TUScope? 8656 ProcessDeclAttributes(TUScope, NewFD, *D); 8657 8658 // In auto-retain/release, infer strong retension for fields of 8659 // retainable type. 8660 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8661 NewFD->setInvalidDecl(); 8662 8663 if (T.isObjCGCWeak()) 8664 Diag(Loc, diag::warn_attribute_weak_on_field); 8665 8666 NewFD->setAccess(AS); 8667 return NewFD; 8668} 8669 8670bool Sema::CheckNontrivialField(FieldDecl *FD) { 8671 assert(FD); 8672 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8673 8674 if (FD->isInvalidDecl()) 8675 return true; 8676 8677 QualType EltTy = Context.getBaseElementType(FD->getType()); 8678 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8679 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8680 if (RDecl->getDefinition()) { 8681 // We check for copy constructors before constructors 8682 // because otherwise we'll never get complaints about 8683 // copy constructors. 8684 8685 CXXSpecialMember member = CXXInvalid; 8686 if (!RDecl->hasTrivialCopyConstructor()) 8687 member = CXXCopyConstructor; 8688 else if (!RDecl->hasTrivialDefaultConstructor()) 8689 member = CXXDefaultConstructor; 8690 else if (!RDecl->hasTrivialCopyAssignment()) 8691 member = CXXCopyAssignment; 8692 else if (!RDecl->hasTrivialDestructor()) 8693 member = CXXDestructor; 8694 8695 if (member != CXXInvalid) { 8696 if (!getLangOptions().CPlusPlus0x && 8697 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8698 // Objective-C++ ARC: it is an error to have a non-trivial field of 8699 // a union. However, system headers in Objective-C programs 8700 // occasionally have Objective-C lifetime objects within unions, 8701 // and rather than cause the program to fail, we make those 8702 // members unavailable. 8703 SourceLocation Loc = FD->getLocation(); 8704 if (getSourceManager().isInSystemHeader(Loc)) { 8705 if (!FD->hasAttr<UnavailableAttr>()) 8706 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8707 "this system field has retaining ownership")); 8708 return false; 8709 } 8710 } 8711 8712 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8713 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8714 diag::err_illegal_union_or_anon_struct_member) 8715 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8716 DiagnoseNontrivial(RT, member); 8717 return !getLangOptions().CPlusPlus0x; 8718 } 8719 } 8720 } 8721 8722 return false; 8723} 8724 8725/// DiagnoseNontrivial - Given that a class has a non-trivial 8726/// special member, figure out why. 8727void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8728 QualType QT(T, 0U); 8729 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8730 8731 // Check whether the member was user-declared. 8732 switch (member) { 8733 case CXXInvalid: 8734 break; 8735 8736 case CXXDefaultConstructor: 8737 if (RD->hasUserDeclaredConstructor()) { 8738 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8739 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8740 const FunctionDecl *body = 0; 8741 ci->hasBody(body); 8742 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8743 SourceLocation CtorLoc = ci->getLocation(); 8744 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8745 return; 8746 } 8747 } 8748 8749 llvm_unreachable("found no user-declared constructors"); 8750 } 8751 break; 8752 8753 case CXXCopyConstructor: 8754 if (RD->hasUserDeclaredCopyConstructor()) { 8755 SourceLocation CtorLoc = 8756 RD->getCopyConstructor(0)->getLocation(); 8757 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8758 return; 8759 } 8760 break; 8761 8762 case CXXMoveConstructor: 8763 if (RD->hasUserDeclaredMoveConstructor()) { 8764 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8765 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8766 return; 8767 } 8768 break; 8769 8770 case CXXCopyAssignment: 8771 if (RD->hasUserDeclaredCopyAssignment()) { 8772 // FIXME: this should use the location of the copy 8773 // assignment, not the type. 8774 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8775 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8776 return; 8777 } 8778 break; 8779 8780 case CXXMoveAssignment: 8781 if (RD->hasUserDeclaredMoveAssignment()) { 8782 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8783 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8784 return; 8785 } 8786 break; 8787 8788 case CXXDestructor: 8789 if (RD->hasUserDeclaredDestructor()) { 8790 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8791 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8792 return; 8793 } 8794 break; 8795 } 8796 8797 typedef CXXRecordDecl::base_class_iterator base_iter; 8798 8799 // Virtual bases and members inhibit trivial copying/construction, 8800 // but not trivial destruction. 8801 if (member != CXXDestructor) { 8802 // Check for virtual bases. vbases includes indirect virtual bases, 8803 // so we just iterate through the direct bases. 8804 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8805 if (bi->isVirtual()) { 8806 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8807 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8808 return; 8809 } 8810 8811 // Check for virtual methods. 8812 typedef CXXRecordDecl::method_iterator meth_iter; 8813 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8814 ++mi) { 8815 if (mi->isVirtual()) { 8816 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8817 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8818 return; 8819 } 8820 } 8821 } 8822 8823 bool (CXXRecordDecl::*hasTrivial)() const; 8824 switch (member) { 8825 case CXXDefaultConstructor: 8826 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8827 case CXXCopyConstructor: 8828 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8829 case CXXCopyAssignment: 8830 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8831 case CXXDestructor: 8832 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8833 default: 8834 llvm_unreachable("unexpected special member"); 8835 } 8836 8837 // Check for nontrivial bases (and recurse). 8838 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8839 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8840 assert(BaseRT && "Don't know how to handle dependent bases"); 8841 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8842 if (!(BaseRecTy->*hasTrivial)()) { 8843 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8844 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8845 DiagnoseNontrivial(BaseRT, member); 8846 return; 8847 } 8848 } 8849 8850 // Check for nontrivial members (and recurse). 8851 typedef RecordDecl::field_iterator field_iter; 8852 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8853 ++fi) { 8854 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8855 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8856 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8857 8858 if (!(EltRD->*hasTrivial)()) { 8859 SourceLocation FLoc = (*fi)->getLocation(); 8860 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8861 DiagnoseNontrivial(EltRT, member); 8862 return; 8863 } 8864 } 8865 8866 if (EltTy->isObjCLifetimeType()) { 8867 switch (EltTy.getObjCLifetime()) { 8868 case Qualifiers::OCL_None: 8869 case Qualifiers::OCL_ExplicitNone: 8870 break; 8871 8872 case Qualifiers::OCL_Autoreleasing: 8873 case Qualifiers::OCL_Weak: 8874 case Qualifiers::OCL_Strong: 8875 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8876 << QT << EltTy.getObjCLifetime(); 8877 return; 8878 } 8879 } 8880 } 8881 8882 llvm_unreachable("found no explanation for non-trivial member"); 8883} 8884 8885/// TranslateIvarVisibility - Translate visibility from a token ID to an 8886/// AST enum value. 8887static ObjCIvarDecl::AccessControl 8888TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8889 switch (ivarVisibility) { 8890 default: llvm_unreachable("Unknown visitibility kind"); 8891 case tok::objc_private: return ObjCIvarDecl::Private; 8892 case tok::objc_public: return ObjCIvarDecl::Public; 8893 case tok::objc_protected: return ObjCIvarDecl::Protected; 8894 case tok::objc_package: return ObjCIvarDecl::Package; 8895 } 8896} 8897 8898/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8899/// in order to create an IvarDecl object for it. 8900Decl *Sema::ActOnIvar(Scope *S, 8901 SourceLocation DeclStart, 8902 Declarator &D, Expr *BitfieldWidth, 8903 tok::ObjCKeywordKind Visibility) { 8904 8905 IdentifierInfo *II = D.getIdentifier(); 8906 Expr *BitWidth = (Expr*)BitfieldWidth; 8907 SourceLocation Loc = DeclStart; 8908 if (II) Loc = D.getIdentifierLoc(); 8909 8910 // FIXME: Unnamed fields can be handled in various different ways, for 8911 // example, unnamed unions inject all members into the struct namespace! 8912 8913 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8914 QualType T = TInfo->getType(); 8915 8916 if (BitWidth) { 8917 // 6.7.2.1p3, 6.7.2.1p4 8918 if (VerifyBitField(Loc, II, T, BitWidth)) { 8919 D.setInvalidType(); 8920 BitWidth = 0; 8921 } 8922 } else { 8923 // Not a bitfield. 8924 8925 // validate II. 8926 8927 } 8928 if (T->isReferenceType()) { 8929 Diag(Loc, diag::err_ivar_reference_type); 8930 D.setInvalidType(); 8931 } 8932 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8933 // than a variably modified type. 8934 else if (T->isVariablyModifiedType()) { 8935 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8936 D.setInvalidType(); 8937 } 8938 8939 // Get the visibility (access control) for this ivar. 8940 ObjCIvarDecl::AccessControl ac = 8941 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8942 : ObjCIvarDecl::None; 8943 // Must set ivar's DeclContext to its enclosing interface. 8944 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8945 ObjCContainerDecl *EnclosingContext; 8946 if (ObjCImplementationDecl *IMPDecl = 8947 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8948 if (!LangOpts.ObjCNonFragileABI2) { 8949 // Case of ivar declared in an implementation. Context is that of its class. 8950 EnclosingContext = IMPDecl->getClassInterface(); 8951 assert(EnclosingContext && "Implementation has no class interface!"); 8952 } 8953 else 8954 EnclosingContext = EnclosingDecl; 8955 } else { 8956 if (ObjCCategoryDecl *CDecl = 8957 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8958 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8959 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8960 return 0; 8961 } 8962 } 8963 EnclosingContext = EnclosingDecl; 8964 } 8965 8966 // Construct the decl. 8967 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8968 DeclStart, Loc, II, T, 8969 TInfo, ac, (Expr *)BitfieldWidth); 8970 8971 if (II) { 8972 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8973 ForRedeclaration); 8974 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8975 && !isa<TagDecl>(PrevDecl)) { 8976 Diag(Loc, diag::err_duplicate_member) << II; 8977 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8978 NewID->setInvalidDecl(); 8979 } 8980 } 8981 8982 // Process attributes attached to the ivar. 8983 ProcessDeclAttributes(S, NewID, D); 8984 8985 if (D.isInvalidType()) 8986 NewID->setInvalidDecl(); 8987 8988 // In ARC, infer 'retaining' for ivars of retainable type. 8989 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8990 NewID->setInvalidDecl(); 8991 8992 if (D.getDeclSpec().isModulePrivateSpecified()) 8993 NewID->setModulePrivate(); 8994 8995 if (II) { 8996 // FIXME: When interfaces are DeclContexts, we'll need to add 8997 // these to the interface. 8998 S->AddDecl(NewID); 8999 IdResolver.AddDecl(NewID); 9000 } 9001 9002 return NewID; 9003} 9004 9005/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9006/// class and class extensions. For every class @interface and class 9007/// extension @interface, if the last ivar is a bitfield of any type, 9008/// then add an implicit `char :0` ivar to the end of that interface. 9009void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9010 SmallVectorImpl<Decl *> &AllIvarDecls) { 9011 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9012 return; 9013 9014 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9015 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9016 9017 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9018 return; 9019 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9020 if (!ID) { 9021 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9022 if (!CD->IsClassExtension()) 9023 return; 9024 } 9025 // No need to add this to end of @implementation. 9026 else 9027 return; 9028 } 9029 // All conditions are met. Add a new bitfield to the tail end of ivars. 9030 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9031 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9032 9033 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9034 DeclLoc, DeclLoc, 0, 9035 Context.CharTy, 9036 Context.getTrivialTypeSourceInfo(Context.CharTy, 9037 DeclLoc), 9038 ObjCIvarDecl::Private, BW, 9039 true); 9040 AllIvarDecls.push_back(Ivar); 9041} 9042 9043void Sema::ActOnFields(Scope* S, 9044 SourceLocation RecLoc, Decl *EnclosingDecl, 9045 llvm::ArrayRef<Decl *> Fields, 9046 SourceLocation LBrac, SourceLocation RBrac, 9047 AttributeList *Attr) { 9048 assert(EnclosingDecl && "missing record or interface decl"); 9049 9050 // If the decl this is being inserted into is invalid, then it may be a 9051 // redeclaration or some other bogus case. Don't try to add fields to it. 9052 if (EnclosingDecl->isInvalidDecl()) 9053 return; 9054 9055 // Verify that all the fields are okay. 9056 unsigned NumNamedMembers = 0; 9057 SmallVector<FieldDecl*, 32> RecFields; 9058 9059 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9060 bool ARCErrReported = false; 9061 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9062 i != end; ++i) { 9063 FieldDecl *FD = cast<FieldDecl>(*i); 9064 9065 // Get the type for the field. 9066 const Type *FDTy = FD->getType().getTypePtr(); 9067 9068 if (!FD->isAnonymousStructOrUnion()) { 9069 // Remember all fields written by the user. 9070 RecFields.push_back(FD); 9071 } 9072 9073 // If the field is already invalid for some reason, don't emit more 9074 // diagnostics about it. 9075 if (FD->isInvalidDecl()) { 9076 EnclosingDecl->setInvalidDecl(); 9077 continue; 9078 } 9079 9080 // C99 6.7.2.1p2: 9081 // A structure or union shall not contain a member with 9082 // incomplete or function type (hence, a structure shall not 9083 // contain an instance of itself, but may contain a pointer to 9084 // an instance of itself), except that the last member of a 9085 // structure with more than one named member may have incomplete 9086 // array type; such a structure (and any union containing, 9087 // possibly recursively, a member that is such a structure) 9088 // shall not be a member of a structure or an element of an 9089 // array. 9090 if (FDTy->isFunctionType()) { 9091 // Field declared as a function. 9092 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9093 << FD->getDeclName(); 9094 FD->setInvalidDecl(); 9095 EnclosingDecl->setInvalidDecl(); 9096 continue; 9097 } else if (FDTy->isIncompleteArrayType() && Record && 9098 ((i + 1 == Fields.end() && !Record->isUnion()) || 9099 ((getLangOptions().MicrosoftExt || 9100 getLangOptions().CPlusPlus) && 9101 (i + 1 == Fields.end() || Record->isUnion())))) { 9102 // Flexible array member. 9103 // Microsoft and g++ is more permissive regarding flexible array. 9104 // It will accept flexible array in union and also 9105 // as the sole element of a struct/class. 9106 if (getLangOptions().MicrosoftExt) { 9107 if (Record->isUnion()) 9108 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9109 << FD->getDeclName(); 9110 else if (Fields.size() == 1) 9111 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9112 << FD->getDeclName() << Record->getTagKind(); 9113 } else if (getLangOptions().CPlusPlus) { 9114 if (Record->isUnion()) 9115 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9116 << FD->getDeclName(); 9117 else if (Fields.size() == 1) 9118 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9119 << FD->getDeclName() << Record->getTagKind(); 9120 } else if (NumNamedMembers < 1) { 9121 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9122 << FD->getDeclName(); 9123 FD->setInvalidDecl(); 9124 EnclosingDecl->setInvalidDecl(); 9125 continue; 9126 } 9127 if (!FD->getType()->isDependentType() && 9128 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9129 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9130 << FD->getDeclName() << FD->getType(); 9131 FD->setInvalidDecl(); 9132 EnclosingDecl->setInvalidDecl(); 9133 continue; 9134 } 9135 // Okay, we have a legal flexible array member at the end of the struct. 9136 if (Record) 9137 Record->setHasFlexibleArrayMember(true); 9138 } else if (!FDTy->isDependentType() && 9139 RequireCompleteType(FD->getLocation(), FD->getType(), 9140 diag::err_field_incomplete)) { 9141 // Incomplete type 9142 FD->setInvalidDecl(); 9143 EnclosingDecl->setInvalidDecl(); 9144 continue; 9145 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9146 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9147 // If this is a member of a union, then entire union becomes "flexible". 9148 if (Record && Record->isUnion()) { 9149 Record->setHasFlexibleArrayMember(true); 9150 } else { 9151 // If this is a struct/class and this is not the last element, reject 9152 // it. Note that GCC supports variable sized arrays in the middle of 9153 // structures. 9154 if (i + 1 != Fields.end()) 9155 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9156 << FD->getDeclName() << FD->getType(); 9157 else { 9158 // We support flexible arrays at the end of structs in 9159 // other structs as an extension. 9160 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9161 << FD->getDeclName(); 9162 if (Record) 9163 Record->setHasFlexibleArrayMember(true); 9164 } 9165 } 9166 } 9167 if (Record && FDTTy->getDecl()->hasObjectMember()) 9168 Record->setHasObjectMember(true); 9169 } else if (FDTy->isObjCObjectType()) { 9170 /// A field cannot be an Objective-c object 9171 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9172 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9173 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9174 FD->setType(T); 9175 } 9176 else if (!getLangOptions().CPlusPlus) { 9177 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9178 // It's an error in ARC if a field has lifetime. 9179 // We don't want to report this in a system header, though, 9180 // so we just make the field unavailable. 9181 // FIXME: that's really not sufficient; we need to make the type 9182 // itself invalid to, say, initialize or copy. 9183 QualType T = FD->getType(); 9184 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9185 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9186 SourceLocation loc = FD->getLocation(); 9187 if (getSourceManager().isInSystemHeader(loc)) { 9188 if (!FD->hasAttr<UnavailableAttr>()) { 9189 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9190 "this system field has retaining ownership")); 9191 } 9192 } else { 9193 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9194 << T->isBlockPointerType(); 9195 } 9196 ARCErrReported = true; 9197 } 9198 } 9199 else if (getLangOptions().ObjC1 && 9200 getLangOptions().getGC() != LangOptions::NonGC && 9201 Record && !Record->hasObjectMember()) { 9202 if (FD->getType()->isObjCObjectPointerType() || 9203 FD->getType().isObjCGCStrong()) 9204 Record->setHasObjectMember(true); 9205 else if (Context.getAsArrayType(FD->getType())) { 9206 QualType BaseType = Context.getBaseElementType(FD->getType()); 9207 if (BaseType->isRecordType() && 9208 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9209 Record->setHasObjectMember(true); 9210 else if (BaseType->isObjCObjectPointerType() || 9211 BaseType.isObjCGCStrong()) 9212 Record->setHasObjectMember(true); 9213 } 9214 } 9215 } 9216 // Keep track of the number of named members. 9217 if (FD->getIdentifier()) 9218 ++NumNamedMembers; 9219 } 9220 9221 // Okay, we successfully defined 'Record'. 9222 if (Record) { 9223 bool Completed = false; 9224 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9225 if (!CXXRecord->isInvalidDecl()) { 9226 // Set access bits correctly on the directly-declared conversions. 9227 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9228 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9229 I != E; ++I) 9230 Convs->setAccess(I, (*I)->getAccess()); 9231 9232 if (!CXXRecord->isDependentType()) { 9233 // Objective-C Automatic Reference Counting: 9234 // If a class has a non-static data member of Objective-C pointer 9235 // type (or array thereof), it is a non-POD type and its 9236 // default constructor (if any), copy constructor, copy assignment 9237 // operator, and destructor are non-trivial. 9238 // 9239 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9240 // However, here we check whether this particular class is only 9241 // non-POD because of the presence of an Objective-C pointer member. 9242 // If so, objects of this type cannot be shared between code compiled 9243 // with instant objects and code compiled with manual retain/release. 9244 if (getLangOptions().ObjCAutoRefCount && 9245 CXXRecord->hasObjectMember() && 9246 CXXRecord->getLinkage() == ExternalLinkage) { 9247 if (CXXRecord->isPOD()) { 9248 Diag(CXXRecord->getLocation(), 9249 diag::warn_arc_non_pod_class_with_object_member) 9250 << CXXRecord; 9251 } else { 9252 // FIXME: Fix-Its would be nice here, but finding a good location 9253 // for them is going to be tricky. 9254 if (CXXRecord->hasTrivialCopyConstructor()) 9255 Diag(CXXRecord->getLocation(), 9256 diag::warn_arc_trivial_member_function_with_object_member) 9257 << CXXRecord << 0; 9258 if (CXXRecord->hasTrivialCopyAssignment()) 9259 Diag(CXXRecord->getLocation(), 9260 diag::warn_arc_trivial_member_function_with_object_member) 9261 << CXXRecord << 1; 9262 if (CXXRecord->hasTrivialDestructor()) 9263 Diag(CXXRecord->getLocation(), 9264 diag::warn_arc_trivial_member_function_with_object_member) 9265 << CXXRecord << 2; 9266 } 9267 } 9268 9269 // Adjust user-defined destructor exception spec. 9270 if (getLangOptions().CPlusPlus0x && 9271 CXXRecord->hasUserDeclaredDestructor()) 9272 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9273 9274 // Add any implicitly-declared members to this class. 9275 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9276 9277 // If we have virtual base classes, we may end up finding multiple 9278 // final overriders for a given virtual function. Check for this 9279 // problem now. 9280 if (CXXRecord->getNumVBases()) { 9281 CXXFinalOverriderMap FinalOverriders; 9282 CXXRecord->getFinalOverriders(FinalOverriders); 9283 9284 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9285 MEnd = FinalOverriders.end(); 9286 M != MEnd; ++M) { 9287 for (OverridingMethods::iterator SO = M->second.begin(), 9288 SOEnd = M->second.end(); 9289 SO != SOEnd; ++SO) { 9290 assert(SO->second.size() > 0 && 9291 "Virtual function without overridding functions?"); 9292 if (SO->second.size() == 1) 9293 continue; 9294 9295 // C++ [class.virtual]p2: 9296 // In a derived class, if a virtual member function of a base 9297 // class subobject has more than one final overrider the 9298 // program is ill-formed. 9299 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9300 << (NamedDecl *)M->first << Record; 9301 Diag(M->first->getLocation(), 9302 diag::note_overridden_virtual_function); 9303 for (OverridingMethods::overriding_iterator 9304 OM = SO->second.begin(), 9305 OMEnd = SO->second.end(); 9306 OM != OMEnd; ++OM) 9307 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9308 << (NamedDecl *)M->first << OM->Method->getParent(); 9309 9310 Record->setInvalidDecl(); 9311 } 9312 } 9313 CXXRecord->completeDefinition(&FinalOverriders); 9314 Completed = true; 9315 } 9316 } 9317 } 9318 } 9319 9320 if (!Completed) 9321 Record->completeDefinition(); 9322 9323 // Now that the record is complete, do any delayed exception spec checks 9324 // we were missing. 9325 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9326 const CXXDestructorDecl *Dtor = 9327 DelayedDestructorExceptionSpecChecks.back().first; 9328 if (Dtor->getParent() != Record) 9329 break; 9330 9331 assert(!Dtor->getParent()->isDependentType() && 9332 "Should not ever add destructors of templates into the list."); 9333 CheckOverridingFunctionExceptionSpec(Dtor, 9334 DelayedDestructorExceptionSpecChecks.back().second); 9335 DelayedDestructorExceptionSpecChecks.pop_back(); 9336 } 9337 9338 } else { 9339 ObjCIvarDecl **ClsFields = 9340 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9341 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9342 ID->setEndOfDefinitionLoc(RBrac); 9343 // Add ivar's to class's DeclContext. 9344 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9345 ClsFields[i]->setLexicalDeclContext(ID); 9346 ID->addDecl(ClsFields[i]); 9347 } 9348 // Must enforce the rule that ivars in the base classes may not be 9349 // duplicates. 9350 if (ID->getSuperClass()) 9351 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9352 } else if (ObjCImplementationDecl *IMPDecl = 9353 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9354 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9355 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9356 // Ivar declared in @implementation never belongs to the implementation. 9357 // Only it is in implementation's lexical context. 9358 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9359 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9360 } else if (ObjCCategoryDecl *CDecl = 9361 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9362 // case of ivars in class extension; all other cases have been 9363 // reported as errors elsewhere. 9364 // FIXME. Class extension does not have a LocEnd field. 9365 // CDecl->setLocEnd(RBrac); 9366 // Add ivar's to class extension's DeclContext. 9367 // Diagnose redeclaration of private ivars. 9368 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9369 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9370 if (IDecl) { 9371 if (const ObjCIvarDecl *ClsIvar = 9372 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9373 Diag(ClsFields[i]->getLocation(), 9374 diag::err_duplicate_ivar_declaration); 9375 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9376 continue; 9377 } 9378 for (const ObjCCategoryDecl *ClsExtDecl = 9379 IDecl->getFirstClassExtension(); 9380 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9381 if (const ObjCIvarDecl *ClsExtIvar = 9382 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9383 Diag(ClsFields[i]->getLocation(), 9384 diag::err_duplicate_ivar_declaration); 9385 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9386 continue; 9387 } 9388 } 9389 } 9390 ClsFields[i]->setLexicalDeclContext(CDecl); 9391 CDecl->addDecl(ClsFields[i]); 9392 } 9393 } 9394 } 9395 9396 if (Attr) 9397 ProcessDeclAttributeList(S, Record, Attr); 9398 9399 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9400 // set the visibility of this record. 9401 if (Record && !Record->getDeclContext()->isRecord()) 9402 AddPushedVisibilityAttribute(Record); 9403} 9404 9405/// \brief Determine whether the given integral value is representable within 9406/// the given type T. 9407static bool isRepresentableIntegerValue(ASTContext &Context, 9408 llvm::APSInt &Value, 9409 QualType T) { 9410 assert(T->isIntegralType(Context) && "Integral type required!"); 9411 unsigned BitWidth = Context.getIntWidth(T); 9412 9413 if (Value.isUnsigned() || Value.isNonNegative()) { 9414 if (T->isSignedIntegerOrEnumerationType()) 9415 --BitWidth; 9416 return Value.getActiveBits() <= BitWidth; 9417 } 9418 return Value.getMinSignedBits() <= BitWidth; 9419} 9420 9421// \brief Given an integral type, return the next larger integral type 9422// (or a NULL type of no such type exists). 9423static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9424 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9425 // enum checking below. 9426 assert(T->isIntegralType(Context) && "Integral type required!"); 9427 const unsigned NumTypes = 4; 9428 QualType SignedIntegralTypes[NumTypes] = { 9429 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9430 }; 9431 QualType UnsignedIntegralTypes[NumTypes] = { 9432 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9433 Context.UnsignedLongLongTy 9434 }; 9435 9436 unsigned BitWidth = Context.getTypeSize(T); 9437 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9438 : UnsignedIntegralTypes; 9439 for (unsigned I = 0; I != NumTypes; ++I) 9440 if (Context.getTypeSize(Types[I]) > BitWidth) 9441 return Types[I]; 9442 9443 return QualType(); 9444} 9445 9446EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9447 EnumConstantDecl *LastEnumConst, 9448 SourceLocation IdLoc, 9449 IdentifierInfo *Id, 9450 Expr *Val) { 9451 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9452 llvm::APSInt EnumVal(IntWidth); 9453 QualType EltTy; 9454 9455 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9456 Val = 0; 9457 9458 if (Val) 9459 Val = DefaultLvalueConversion(Val).take(); 9460 9461 if (Val) { 9462 if (Enum->isDependentType() || Val->isTypeDependent()) 9463 EltTy = Context.DependentTy; 9464 else { 9465 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9466 SourceLocation ExpLoc; 9467 if (!Val->isValueDependent() && 9468 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9469 Val = 0; 9470 } else { 9471 if (!getLangOptions().CPlusPlus) { 9472 // C99 6.7.2.2p2: 9473 // The expression that defines the value of an enumeration constant 9474 // shall be an integer constant expression that has a value 9475 // representable as an int. 9476 9477 // Complain if the value is not representable in an int. 9478 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9479 Diag(IdLoc, diag::ext_enum_value_not_int) 9480 << EnumVal.toString(10) << Val->getSourceRange() 9481 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9482 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9483 // Force the type of the expression to 'int'. 9484 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9485 } 9486 } 9487 9488 if (Enum->isFixed()) { 9489 EltTy = Enum->getIntegerType(); 9490 9491 // C++0x [dcl.enum]p5: 9492 // ... if the initializing value of an enumerator cannot be 9493 // represented by the underlying type, the program is ill-formed. 9494 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9495 if (getLangOptions().MicrosoftExt) { 9496 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9497 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9498 } else 9499 Diag(IdLoc, diag::err_enumerator_too_large) 9500 << EltTy; 9501 } else 9502 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9503 } 9504 else { 9505 // C++0x [dcl.enum]p5: 9506 // If the underlying type is not fixed, the type of each enumerator 9507 // is the type of its initializing value: 9508 // - If an initializer is specified for an enumerator, the 9509 // initializing value has the same type as the expression. 9510 EltTy = Val->getType(); 9511 } 9512 } 9513 } 9514 } 9515 9516 if (!Val) { 9517 if (Enum->isDependentType()) 9518 EltTy = Context.DependentTy; 9519 else if (!LastEnumConst) { 9520 // C++0x [dcl.enum]p5: 9521 // If the underlying type is not fixed, the type of each enumerator 9522 // is the type of its initializing value: 9523 // - If no initializer is specified for the first enumerator, the 9524 // initializing value has an unspecified integral type. 9525 // 9526 // GCC uses 'int' for its unspecified integral type, as does 9527 // C99 6.7.2.2p3. 9528 if (Enum->isFixed()) { 9529 EltTy = Enum->getIntegerType(); 9530 } 9531 else { 9532 EltTy = Context.IntTy; 9533 } 9534 } else { 9535 // Assign the last value + 1. 9536 EnumVal = LastEnumConst->getInitVal(); 9537 ++EnumVal; 9538 EltTy = LastEnumConst->getType(); 9539 9540 // Check for overflow on increment. 9541 if (EnumVal < LastEnumConst->getInitVal()) { 9542 // C++0x [dcl.enum]p5: 9543 // If the underlying type is not fixed, the type of each enumerator 9544 // is the type of its initializing value: 9545 // 9546 // - Otherwise the type of the initializing value is the same as 9547 // the type of the initializing value of the preceding enumerator 9548 // unless the incremented value is not representable in that type, 9549 // in which case the type is an unspecified integral type 9550 // sufficient to contain the incremented value. If no such type 9551 // exists, the program is ill-formed. 9552 QualType T = getNextLargerIntegralType(Context, EltTy); 9553 if (T.isNull() || Enum->isFixed()) { 9554 // There is no integral type larger enough to represent this 9555 // value. Complain, then allow the value to wrap around. 9556 EnumVal = LastEnumConst->getInitVal(); 9557 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9558 ++EnumVal; 9559 if (Enum->isFixed()) 9560 // When the underlying type is fixed, this is ill-formed. 9561 Diag(IdLoc, diag::err_enumerator_wrapped) 9562 << EnumVal.toString(10) 9563 << EltTy; 9564 else 9565 Diag(IdLoc, diag::warn_enumerator_too_large) 9566 << EnumVal.toString(10); 9567 } else { 9568 EltTy = T; 9569 } 9570 9571 // Retrieve the last enumerator's value, extent that type to the 9572 // type that is supposed to be large enough to represent the incremented 9573 // value, then increment. 9574 EnumVal = LastEnumConst->getInitVal(); 9575 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9576 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9577 ++EnumVal; 9578 9579 // If we're not in C++, diagnose the overflow of enumerator values, 9580 // which in C99 means that the enumerator value is not representable in 9581 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9582 // permits enumerator values that are representable in some larger 9583 // integral type. 9584 if (!getLangOptions().CPlusPlus && !T.isNull()) 9585 Diag(IdLoc, diag::warn_enum_value_overflow); 9586 } else if (!getLangOptions().CPlusPlus && 9587 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9588 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9589 Diag(IdLoc, diag::ext_enum_value_not_int) 9590 << EnumVal.toString(10) << 1; 9591 } 9592 } 9593 } 9594 9595 if (!EltTy->isDependentType()) { 9596 // Make the enumerator value match the signedness and size of the 9597 // enumerator's type. 9598 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9599 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9600 } 9601 9602 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9603 Val, EnumVal); 9604} 9605 9606 9607Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9608 SourceLocation IdLoc, IdentifierInfo *Id, 9609 AttributeList *Attr, 9610 SourceLocation EqualLoc, Expr *val) { 9611 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9612 EnumConstantDecl *LastEnumConst = 9613 cast_or_null<EnumConstantDecl>(lastEnumConst); 9614 Expr *Val = static_cast<Expr*>(val); 9615 9616 // The scope passed in may not be a decl scope. Zip up the scope tree until 9617 // we find one that is. 9618 S = getNonFieldDeclScope(S); 9619 9620 // Verify that there isn't already something declared with this name in this 9621 // scope. 9622 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9623 ForRedeclaration); 9624 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9625 // Maybe we will complain about the shadowed template parameter. 9626 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9627 // Just pretend that we didn't see the previous declaration. 9628 PrevDecl = 0; 9629 } 9630 9631 if (PrevDecl) { 9632 // When in C++, we may get a TagDecl with the same name; in this case the 9633 // enum constant will 'hide' the tag. 9634 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9635 "Received TagDecl when not in C++!"); 9636 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9637 if (isa<EnumConstantDecl>(PrevDecl)) 9638 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9639 else 9640 Diag(IdLoc, diag::err_redefinition) << Id; 9641 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9642 return 0; 9643 } 9644 } 9645 9646 // C++ [class.mem]p13: 9647 // If T is the name of a class, then each of the following shall have a 9648 // name different from T: 9649 // - every enumerator of every member of class T that is an enumerated 9650 // type 9651 if (CXXRecordDecl *Record 9652 = dyn_cast<CXXRecordDecl>( 9653 TheEnumDecl->getDeclContext()->getRedeclContext())) 9654 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9655 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9656 9657 EnumConstantDecl *New = 9658 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9659 9660 if (New) { 9661 // Process attributes. 9662 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9663 9664 // Register this decl in the current scope stack. 9665 New->setAccess(TheEnumDecl->getAccess()); 9666 PushOnScopeChains(New, S); 9667 } 9668 9669 return New; 9670} 9671 9672void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9673 SourceLocation RBraceLoc, Decl *EnumDeclX, 9674 Decl **Elements, unsigned NumElements, 9675 Scope *S, AttributeList *Attr) { 9676 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9677 QualType EnumType = Context.getTypeDeclType(Enum); 9678 9679 if (Attr) 9680 ProcessDeclAttributeList(S, Enum, Attr); 9681 9682 if (Enum->isDependentType()) { 9683 for (unsigned i = 0; i != NumElements; ++i) { 9684 EnumConstantDecl *ECD = 9685 cast_or_null<EnumConstantDecl>(Elements[i]); 9686 if (!ECD) continue; 9687 9688 ECD->setType(EnumType); 9689 } 9690 9691 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9692 return; 9693 } 9694 9695 // TODO: If the result value doesn't fit in an int, it must be a long or long 9696 // long value. ISO C does not support this, but GCC does as an extension, 9697 // emit a warning. 9698 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9699 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9700 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9701 9702 // Verify that all the values are okay, compute the size of the values, and 9703 // reverse the list. 9704 unsigned NumNegativeBits = 0; 9705 unsigned NumPositiveBits = 0; 9706 9707 // Keep track of whether all elements have type int. 9708 bool AllElementsInt = true; 9709 9710 for (unsigned i = 0; i != NumElements; ++i) { 9711 EnumConstantDecl *ECD = 9712 cast_or_null<EnumConstantDecl>(Elements[i]); 9713 if (!ECD) continue; // Already issued a diagnostic. 9714 9715 const llvm::APSInt &InitVal = ECD->getInitVal(); 9716 9717 // Keep track of the size of positive and negative values. 9718 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9719 NumPositiveBits = std::max(NumPositiveBits, 9720 (unsigned)InitVal.getActiveBits()); 9721 else 9722 NumNegativeBits = std::max(NumNegativeBits, 9723 (unsigned)InitVal.getMinSignedBits()); 9724 9725 // Keep track of whether every enum element has type int (very commmon). 9726 if (AllElementsInt) 9727 AllElementsInt = ECD->getType() == Context.IntTy; 9728 } 9729 9730 // Figure out the type that should be used for this enum. 9731 QualType BestType; 9732 unsigned BestWidth; 9733 9734 // C++0x N3000 [conv.prom]p3: 9735 // An rvalue of an unscoped enumeration type whose underlying 9736 // type is not fixed can be converted to an rvalue of the first 9737 // of the following types that can represent all the values of 9738 // the enumeration: int, unsigned int, long int, unsigned long 9739 // int, long long int, or unsigned long long int. 9740 // C99 6.4.4.3p2: 9741 // An identifier declared as an enumeration constant has type int. 9742 // The C99 rule is modified by a gcc extension 9743 QualType BestPromotionType; 9744 9745 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9746 // -fshort-enums is the equivalent to specifying the packed attribute on all 9747 // enum definitions. 9748 if (LangOpts.ShortEnums) 9749 Packed = true; 9750 9751 if (Enum->isFixed()) { 9752 BestType = Enum->getIntegerType(); 9753 if (BestType->isPromotableIntegerType()) 9754 BestPromotionType = Context.getPromotedIntegerType(BestType); 9755 else 9756 BestPromotionType = BestType; 9757 // We don't need to set BestWidth, because BestType is going to be the type 9758 // of the enumerators, but we do anyway because otherwise some compilers 9759 // warn that it might be used uninitialized. 9760 BestWidth = CharWidth; 9761 } 9762 else if (NumNegativeBits) { 9763 // If there is a negative value, figure out the smallest integer type (of 9764 // int/long/longlong) that fits. 9765 // If it's packed, check also if it fits a char or a short. 9766 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9767 BestType = Context.SignedCharTy; 9768 BestWidth = CharWidth; 9769 } else if (Packed && NumNegativeBits <= ShortWidth && 9770 NumPositiveBits < ShortWidth) { 9771 BestType = Context.ShortTy; 9772 BestWidth = ShortWidth; 9773 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9774 BestType = Context.IntTy; 9775 BestWidth = IntWidth; 9776 } else { 9777 BestWidth = Context.getTargetInfo().getLongWidth(); 9778 9779 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9780 BestType = Context.LongTy; 9781 } else { 9782 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9783 9784 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9785 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9786 BestType = Context.LongLongTy; 9787 } 9788 } 9789 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9790 } else { 9791 // If there is no negative value, figure out the smallest type that fits 9792 // all of the enumerator values. 9793 // If it's packed, check also if it fits a char or a short. 9794 if (Packed && NumPositiveBits <= CharWidth) { 9795 BestType = Context.UnsignedCharTy; 9796 BestPromotionType = Context.IntTy; 9797 BestWidth = CharWidth; 9798 } else if (Packed && NumPositiveBits <= ShortWidth) { 9799 BestType = Context.UnsignedShortTy; 9800 BestPromotionType = Context.IntTy; 9801 BestWidth = ShortWidth; 9802 } else if (NumPositiveBits <= IntWidth) { 9803 BestType = Context.UnsignedIntTy; 9804 BestWidth = IntWidth; 9805 BestPromotionType 9806 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9807 ? Context.UnsignedIntTy : Context.IntTy; 9808 } else if (NumPositiveBits <= 9809 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9810 BestType = Context.UnsignedLongTy; 9811 BestPromotionType 9812 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9813 ? Context.UnsignedLongTy : Context.LongTy; 9814 } else { 9815 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9816 assert(NumPositiveBits <= BestWidth && 9817 "How could an initializer get larger than ULL?"); 9818 BestType = Context.UnsignedLongLongTy; 9819 BestPromotionType 9820 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9821 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9822 } 9823 } 9824 9825 // Loop over all of the enumerator constants, changing their types to match 9826 // the type of the enum if needed. 9827 for (unsigned i = 0; i != NumElements; ++i) { 9828 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9829 if (!ECD) continue; // Already issued a diagnostic. 9830 9831 // Standard C says the enumerators have int type, but we allow, as an 9832 // extension, the enumerators to be larger than int size. If each 9833 // enumerator value fits in an int, type it as an int, otherwise type it the 9834 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9835 // that X has type 'int', not 'unsigned'. 9836 9837 // Determine whether the value fits into an int. 9838 llvm::APSInt InitVal = ECD->getInitVal(); 9839 9840 // If it fits into an integer type, force it. Otherwise force it to match 9841 // the enum decl type. 9842 QualType NewTy; 9843 unsigned NewWidth; 9844 bool NewSign; 9845 if (!getLangOptions().CPlusPlus && 9846 !Enum->isFixed() && 9847 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9848 NewTy = Context.IntTy; 9849 NewWidth = IntWidth; 9850 NewSign = true; 9851 } else if (ECD->getType() == BestType) { 9852 // Already the right type! 9853 if (getLangOptions().CPlusPlus) 9854 // C++ [dcl.enum]p4: Following the closing brace of an 9855 // enum-specifier, each enumerator has the type of its 9856 // enumeration. 9857 ECD->setType(EnumType); 9858 continue; 9859 } else { 9860 NewTy = BestType; 9861 NewWidth = BestWidth; 9862 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9863 } 9864 9865 // Adjust the APSInt value. 9866 InitVal = InitVal.extOrTrunc(NewWidth); 9867 InitVal.setIsSigned(NewSign); 9868 ECD->setInitVal(InitVal); 9869 9870 // Adjust the Expr initializer and type. 9871 if (ECD->getInitExpr() && 9872 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9873 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9874 CK_IntegralCast, 9875 ECD->getInitExpr(), 9876 /*base paths*/ 0, 9877 VK_RValue)); 9878 if (getLangOptions().CPlusPlus) 9879 // C++ [dcl.enum]p4: Following the closing brace of an 9880 // enum-specifier, each enumerator has the type of its 9881 // enumeration. 9882 ECD->setType(EnumType); 9883 else 9884 ECD->setType(NewTy); 9885 } 9886 9887 Enum->completeDefinition(BestType, BestPromotionType, 9888 NumPositiveBits, NumNegativeBits); 9889} 9890 9891Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9892 SourceLocation StartLoc, 9893 SourceLocation EndLoc) { 9894 StringLiteral *AsmString = cast<StringLiteral>(expr); 9895 9896 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9897 AsmString, StartLoc, 9898 EndLoc); 9899 CurContext->addDecl(New); 9900 return New; 9901} 9902 9903DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 9904 SourceLocation ImportLoc, 9905 ModuleIdPath Path) { 9906 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9907 Module::AllVisible, 9908 /*IsIncludeDirective=*/false); 9909 if (!Mod) 9910 return true; 9911 9912 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9913 Module *ModCheck = Mod; 9914 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9915 // If we've run out of module parents, just drop the remaining identifiers. 9916 // We need the length to be consistent. 9917 if (!ModCheck) 9918 break; 9919 ModCheck = ModCheck->Parent; 9920 9921 IdentifierLocs.push_back(Path[I].second); 9922 } 9923 9924 ImportDecl *Import = ImportDecl::Create(Context, 9925 Context.getTranslationUnitDecl(), 9926 AtLoc.isValid()? AtLoc : ImportLoc, 9927 Mod, IdentifierLocs); 9928 Context.getTranslationUnitDecl()->addDecl(Import); 9929 return Import; 9930} 9931 9932void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9933 SourceLocation PragmaLoc, 9934 SourceLocation NameLoc) { 9935 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9936 9937 if (PrevDecl) { 9938 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9939 } else { 9940 (void)WeakUndeclaredIdentifiers.insert( 9941 std::pair<IdentifierInfo*,WeakInfo> 9942 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9943 } 9944} 9945 9946void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9947 IdentifierInfo* AliasName, 9948 SourceLocation PragmaLoc, 9949 SourceLocation NameLoc, 9950 SourceLocation AliasNameLoc) { 9951 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9952 LookupOrdinaryName); 9953 WeakInfo W = WeakInfo(Name, NameLoc); 9954 9955 if (PrevDecl) { 9956 if (!PrevDecl->hasAttr<AliasAttr>()) 9957 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9958 DeclApplyPragmaWeak(TUScope, ND, W); 9959 } else { 9960 (void)WeakUndeclaredIdentifiers.insert( 9961 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9962 } 9963} 9964 9965Decl *Sema::getObjCDeclContext() const { 9966 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9967} 9968 9969AvailabilityResult Sema::getCurContextAvailability() const { 9970 const Decl *D = cast<Decl>(getCurLexicalContext()); 9971 // A category implicitly has the availability of the interface. 9972 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9973 D = CatD->getClassInterface(); 9974 9975 return D->getAvailability(); 9976} 9977