SemaDecl.cpp revision 8d2a701734f6e0aa778f6be4e6b6d561d8ba6fdb
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 ValueDecl *VD = dyn_cast<ValueDecl>(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 // FIXME: Checking for the presence of a user-declared constructor 1133 // isn't completely accurate; we'd prefer to check that the initializer 1134 // has no side effects. 1135 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1136 return false; 1137 } 1138 } 1139 1140 // TODO: __attribute__((unused)) templates? 1141 } 1142 1143 return true; 1144} 1145 1146static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1147 FixItHint &Hint) { 1148 if (isa<LabelDecl>(D)) { 1149 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1150 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1151 if (AfterColon.isInvalid()) 1152 return; 1153 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1154 getCharRange(D->getLocStart(), AfterColon)); 1155 } 1156 return; 1157} 1158 1159/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1160/// unless they are marked attr(unused). 1161void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1162 FixItHint Hint; 1163 if (!ShouldDiagnoseUnusedDecl(D)) 1164 return; 1165 1166 GenerateFixForUnusedDecl(D, Context, Hint); 1167 1168 unsigned DiagID; 1169 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1170 DiagID = diag::warn_unused_exception_param; 1171 else if (isa<LabelDecl>(D)) 1172 DiagID = diag::warn_unused_label; 1173 else 1174 DiagID = diag::warn_unused_variable; 1175 1176 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1177} 1178 1179static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1180 // Verify that we have no forward references left. If so, there was a goto 1181 // or address of a label taken, but no definition of it. Label fwd 1182 // definitions are indicated with a null substmt. 1183 if (L->getStmt() == 0) 1184 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1185} 1186 1187void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1188 if (S->decl_empty()) return; 1189 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1190 "Scope shouldn't contain decls!"); 1191 1192 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1193 I != E; ++I) { 1194 Decl *TmpD = (*I); 1195 assert(TmpD && "This decl didn't get pushed??"); 1196 1197 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1198 NamedDecl *D = cast<NamedDecl>(TmpD); 1199 1200 if (!D->getDeclName()) continue; 1201 1202 // Diagnose unused variables in this scope. 1203 if (!S->hasErrorOccurred()) 1204 DiagnoseUnusedDecl(D); 1205 1206 // If this was a forward reference to a label, verify it was defined. 1207 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1208 CheckPoppedLabel(LD, *this); 1209 1210 // Remove this name from our lexical scope. 1211 IdResolver.RemoveDecl(D); 1212 } 1213} 1214 1215/// \brief Look for an Objective-C class in the translation unit. 1216/// 1217/// \param Id The name of the Objective-C class we're looking for. If 1218/// typo-correction fixes this name, the Id will be updated 1219/// to the fixed name. 1220/// 1221/// \param IdLoc The location of the name in the translation unit. 1222/// 1223/// \param TypoCorrection If true, this routine will attempt typo correction 1224/// if there is no class with the given name. 1225/// 1226/// \returns The declaration of the named Objective-C class, or NULL if the 1227/// class could not be found. 1228ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1229 SourceLocation IdLoc, 1230 bool DoTypoCorrection) { 1231 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1232 // creation from this context. 1233 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1234 1235 if (!IDecl && DoTypoCorrection) { 1236 // Perform typo correction at the given location, but only if we 1237 // find an Objective-C class name. 1238 TypoCorrection C; 1239 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1240 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1241 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1242 Diag(IdLoc, diag::err_undef_interface_suggest) 1243 << Id << IDecl->getDeclName() 1244 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1245 Diag(IDecl->getLocation(), diag::note_previous_decl) 1246 << IDecl->getDeclName(); 1247 1248 Id = IDecl->getIdentifier(); 1249 } 1250 } 1251 1252 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1253} 1254 1255/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1256/// from S, where a non-field would be declared. This routine copes 1257/// with the difference between C and C++ scoping rules in structs and 1258/// unions. For example, the following code is well-formed in C but 1259/// ill-formed in C++: 1260/// @code 1261/// struct S6 { 1262/// enum { BAR } e; 1263/// }; 1264/// 1265/// void test_S6() { 1266/// struct S6 a; 1267/// a.e = BAR; 1268/// } 1269/// @endcode 1270/// For the declaration of BAR, this routine will return a different 1271/// scope. The scope S will be the scope of the unnamed enumeration 1272/// within S6. In C++, this routine will return the scope associated 1273/// with S6, because the enumeration's scope is a transparent 1274/// context but structures can contain non-field names. In C, this 1275/// routine will return the translation unit scope, since the 1276/// enumeration's scope is a transparent context and structures cannot 1277/// contain non-field names. 1278Scope *Sema::getNonFieldDeclScope(Scope *S) { 1279 while (((S->getFlags() & Scope::DeclScope) == 0) || 1280 (S->getEntity() && 1281 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1282 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1283 S = S->getParent(); 1284 return S; 1285} 1286 1287/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1288/// file scope. lazily create a decl for it. ForRedeclaration is true 1289/// if we're creating this built-in in anticipation of redeclaring the 1290/// built-in. 1291NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1292 Scope *S, bool ForRedeclaration, 1293 SourceLocation Loc) { 1294 Builtin::ID BID = (Builtin::ID)bid; 1295 1296 ASTContext::GetBuiltinTypeError Error; 1297 QualType R = Context.GetBuiltinType(BID, Error); 1298 switch (Error) { 1299 case ASTContext::GE_None: 1300 // Okay 1301 break; 1302 1303 case ASTContext::GE_Missing_stdio: 1304 if (ForRedeclaration) 1305 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1306 << Context.BuiltinInfo.GetName(BID); 1307 return 0; 1308 1309 case ASTContext::GE_Missing_setjmp: 1310 if (ForRedeclaration) 1311 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1312 << Context.BuiltinInfo.GetName(BID); 1313 return 0; 1314 1315 case ASTContext::GE_Missing_ucontext: 1316 if (ForRedeclaration) 1317 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1318 << Context.BuiltinInfo.GetName(BID); 1319 return 0; 1320 } 1321 1322 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1323 Diag(Loc, diag::ext_implicit_lib_function_decl) 1324 << Context.BuiltinInfo.GetName(BID) 1325 << R; 1326 if (Context.BuiltinInfo.getHeaderName(BID) && 1327 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1328 != DiagnosticsEngine::Ignored) 1329 Diag(Loc, diag::note_please_include_header) 1330 << Context.BuiltinInfo.getHeaderName(BID) 1331 << Context.BuiltinInfo.GetName(BID); 1332 } 1333 1334 FunctionDecl *New = FunctionDecl::Create(Context, 1335 Context.getTranslationUnitDecl(), 1336 Loc, Loc, II, R, /*TInfo=*/0, 1337 SC_Extern, 1338 SC_None, false, 1339 /*hasPrototype=*/true); 1340 New->setImplicit(); 1341 1342 // Create Decl objects for each parameter, adding them to the 1343 // FunctionDecl. 1344 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1345 SmallVector<ParmVarDecl*, 16> Params; 1346 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1347 ParmVarDecl *parm = 1348 ParmVarDecl::Create(Context, New, SourceLocation(), 1349 SourceLocation(), 0, 1350 FT->getArgType(i), /*TInfo=*/0, 1351 SC_None, SC_None, 0); 1352 parm->setScopeInfo(0, i); 1353 Params.push_back(parm); 1354 } 1355 New->setParams(Params); 1356 } 1357 1358 AddKnownFunctionAttributes(New); 1359 1360 // TUScope is the translation-unit scope to insert this function into. 1361 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1362 // relate Scopes to DeclContexts, and probably eliminate CurContext 1363 // entirely, but we're not there yet. 1364 DeclContext *SavedContext = CurContext; 1365 CurContext = Context.getTranslationUnitDecl(); 1366 PushOnScopeChains(New, TUScope); 1367 CurContext = SavedContext; 1368 return New; 1369} 1370 1371/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1372/// same name and scope as a previous declaration 'Old'. Figure out 1373/// how to resolve this situation, merging decls or emitting 1374/// diagnostics as appropriate. If there was an error, set New to be invalid. 1375/// 1376void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1377 // If the new decl is known invalid already, don't bother doing any 1378 // merging checks. 1379 if (New->isInvalidDecl()) return; 1380 1381 // Allow multiple definitions for ObjC built-in typedefs. 1382 // FIXME: Verify the underlying types are equivalent! 1383 if (getLangOptions().ObjC1) { 1384 const IdentifierInfo *TypeID = New->getIdentifier(); 1385 switch (TypeID->getLength()) { 1386 default: break; 1387 case 2: 1388 if (!TypeID->isStr("id")) 1389 break; 1390 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1391 // Install the built-in type for 'id', ignoring the current definition. 1392 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1393 return; 1394 case 5: 1395 if (!TypeID->isStr("Class")) 1396 break; 1397 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1398 // Install the built-in type for 'Class', ignoring the current definition. 1399 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1400 return; 1401 case 3: 1402 if (!TypeID->isStr("SEL")) 1403 break; 1404 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1405 // Install the built-in type for 'SEL', ignoring the current definition. 1406 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1407 return; 1408 } 1409 // Fall through - the typedef name was not a builtin type. 1410 } 1411 1412 // Verify the old decl was also a type. 1413 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1414 if (!Old) { 1415 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1416 << New->getDeclName(); 1417 1418 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1419 if (OldD->getLocation().isValid()) 1420 Diag(OldD->getLocation(), diag::note_previous_definition); 1421 1422 return New->setInvalidDecl(); 1423 } 1424 1425 // If the old declaration is invalid, just give up here. 1426 if (Old->isInvalidDecl()) 1427 return New->setInvalidDecl(); 1428 1429 // Determine the "old" type we'll use for checking and diagnostics. 1430 QualType OldType; 1431 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1432 OldType = OldTypedef->getUnderlyingType(); 1433 else 1434 OldType = Context.getTypeDeclType(Old); 1435 1436 // If the typedef types are not identical, reject them in all languages and 1437 // with any extensions enabled. 1438 1439 if (OldType != New->getUnderlyingType() && 1440 Context.getCanonicalType(OldType) != 1441 Context.getCanonicalType(New->getUnderlyingType())) { 1442 int Kind = 0; 1443 if (isa<TypeAliasDecl>(Old)) 1444 Kind = 1; 1445 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1446 << Kind << New->getUnderlyingType() << OldType; 1447 if (Old->getLocation().isValid()) 1448 Diag(Old->getLocation(), diag::note_previous_definition); 1449 return New->setInvalidDecl(); 1450 } 1451 1452 // The types match. Link up the redeclaration chain if the old 1453 // declaration was a typedef. 1454 // FIXME: this is a potential source of weirdness if the type 1455 // spellings don't match exactly. 1456 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1457 New->setPreviousDeclaration(Typedef); 1458 1459 if (getLangOptions().MicrosoftExt) 1460 return; 1461 1462 if (getLangOptions().CPlusPlus) { 1463 // C++ [dcl.typedef]p2: 1464 // In a given non-class scope, a typedef specifier can be used to 1465 // redefine the name of any type declared in that scope to refer 1466 // to the type to which it already refers. 1467 if (!isa<CXXRecordDecl>(CurContext)) 1468 return; 1469 1470 // C++0x [dcl.typedef]p4: 1471 // In a given class scope, a typedef specifier can be used to redefine 1472 // any class-name declared in that scope that is not also a typedef-name 1473 // to refer to the type to which it already refers. 1474 // 1475 // This wording came in via DR424, which was a correction to the 1476 // wording in DR56, which accidentally banned code like: 1477 // 1478 // struct S { 1479 // typedef struct A { } A; 1480 // }; 1481 // 1482 // in the C++03 standard. We implement the C++0x semantics, which 1483 // allow the above but disallow 1484 // 1485 // struct S { 1486 // typedef int I; 1487 // typedef int I; 1488 // }; 1489 // 1490 // since that was the intent of DR56. 1491 if (!isa<TypedefNameDecl>(Old)) 1492 return; 1493 1494 Diag(New->getLocation(), diag::err_redefinition) 1495 << New->getDeclName(); 1496 Diag(Old->getLocation(), diag::note_previous_definition); 1497 return New->setInvalidDecl(); 1498 } 1499 1500 // If we have a redefinition of a typedef in C, emit a warning. This warning 1501 // is normally mapped to an error, but can be controlled with 1502 // -Wtypedef-redefinition. If either the original or the redefinition is 1503 // in a system header, don't emit this for compatibility with GCC. 1504 if (getDiagnostics().getSuppressSystemWarnings() && 1505 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1506 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1507 return; 1508 1509 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1510 << New->getDeclName(); 1511 Diag(Old->getLocation(), diag::note_previous_definition); 1512 return; 1513} 1514 1515/// DeclhasAttr - returns true if decl Declaration already has the target 1516/// attribute. 1517static bool 1518DeclHasAttr(const Decl *D, const Attr *A) { 1519 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1520 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1521 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1522 if ((*i)->getKind() == A->getKind()) { 1523 if (Ann) { 1524 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1525 return true; 1526 continue; 1527 } 1528 // FIXME: Don't hardcode this check 1529 if (OA && isa<OwnershipAttr>(*i)) 1530 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1531 return true; 1532 } 1533 1534 return false; 1535} 1536 1537/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1538static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1539 ASTContext &C, bool mergeDeprecation = true) { 1540 if (!oldDecl->hasAttrs()) 1541 return; 1542 1543 bool foundAny = newDecl->hasAttrs(); 1544 1545 // Ensure that any moving of objects within the allocated map is done before 1546 // we process them. 1547 if (!foundAny) newDecl->setAttrs(AttrVec()); 1548 1549 for (specific_attr_iterator<InheritableAttr> 1550 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1551 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1552 // Ignore deprecated/unavailable/availability attributes if requested. 1553 if (!mergeDeprecation && 1554 (isa<DeprecatedAttr>(*i) || 1555 isa<UnavailableAttr>(*i) || 1556 isa<AvailabilityAttr>(*i))) 1557 continue; 1558 1559 if (!DeclHasAttr(newDecl, *i)) { 1560 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1561 newAttr->setInherited(true); 1562 newDecl->addAttr(newAttr); 1563 foundAny = true; 1564 } 1565 } 1566 1567 if (!foundAny) newDecl->dropAttrs(); 1568} 1569 1570/// mergeParamDeclAttributes - Copy attributes from the old parameter 1571/// to the new one. 1572static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1573 const ParmVarDecl *oldDecl, 1574 ASTContext &C) { 1575 if (!oldDecl->hasAttrs()) 1576 return; 1577 1578 bool foundAny = newDecl->hasAttrs(); 1579 1580 // Ensure that any moving of objects within the allocated map is 1581 // done before we process them. 1582 if (!foundAny) newDecl->setAttrs(AttrVec()); 1583 1584 for (specific_attr_iterator<InheritableParamAttr> 1585 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1586 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1587 if (!DeclHasAttr(newDecl, *i)) { 1588 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1589 newAttr->setInherited(true); 1590 newDecl->addAttr(newAttr); 1591 foundAny = true; 1592 } 1593 } 1594 1595 if (!foundAny) newDecl->dropAttrs(); 1596} 1597 1598namespace { 1599 1600/// Used in MergeFunctionDecl to keep track of function parameters in 1601/// C. 1602struct GNUCompatibleParamWarning { 1603 ParmVarDecl *OldParm; 1604 ParmVarDecl *NewParm; 1605 QualType PromotedType; 1606}; 1607 1608} 1609 1610/// getSpecialMember - get the special member enum for a method. 1611Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1612 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1613 if (Ctor->isDefaultConstructor()) 1614 return Sema::CXXDefaultConstructor; 1615 1616 if (Ctor->isCopyConstructor()) 1617 return Sema::CXXCopyConstructor; 1618 1619 if (Ctor->isMoveConstructor()) 1620 return Sema::CXXMoveConstructor; 1621 } else if (isa<CXXDestructorDecl>(MD)) { 1622 return Sema::CXXDestructor; 1623 } else if (MD->isCopyAssignmentOperator()) { 1624 return Sema::CXXCopyAssignment; 1625 } else if (MD->isMoveAssignmentOperator()) { 1626 return Sema::CXXMoveAssignment; 1627 } 1628 1629 return Sema::CXXInvalid; 1630} 1631 1632/// canRedefineFunction - checks if a function can be redefined. Currently, 1633/// only extern inline functions can be redefined, and even then only in 1634/// GNU89 mode. 1635static bool canRedefineFunction(const FunctionDecl *FD, 1636 const LangOptions& LangOpts) { 1637 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1638 !LangOpts.CPlusPlus && 1639 FD->isInlineSpecified() && 1640 FD->getStorageClass() == SC_Extern); 1641} 1642 1643/// MergeFunctionDecl - We just parsed a function 'New' from 1644/// declarator D which has the same name and scope as a previous 1645/// declaration 'Old'. Figure out how to resolve this situation, 1646/// merging decls or emitting diagnostics as appropriate. 1647/// 1648/// In C++, New and Old must be declarations that are not 1649/// overloaded. Use IsOverload to determine whether New and Old are 1650/// overloaded, and to select the Old declaration that New should be 1651/// merged with. 1652/// 1653/// Returns true if there was an error, false otherwise. 1654bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1655 // Verify the old decl was also a function. 1656 FunctionDecl *Old = 0; 1657 if (FunctionTemplateDecl *OldFunctionTemplate 1658 = dyn_cast<FunctionTemplateDecl>(OldD)) 1659 Old = OldFunctionTemplate->getTemplatedDecl(); 1660 else 1661 Old = dyn_cast<FunctionDecl>(OldD); 1662 if (!Old) { 1663 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1664 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1665 Diag(Shadow->getTargetDecl()->getLocation(), 1666 diag::note_using_decl_target); 1667 Diag(Shadow->getUsingDecl()->getLocation(), 1668 diag::note_using_decl) << 0; 1669 return true; 1670 } 1671 1672 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1673 << New->getDeclName(); 1674 Diag(OldD->getLocation(), diag::note_previous_definition); 1675 return true; 1676 } 1677 1678 // Determine whether the previous declaration was a definition, 1679 // implicit declaration, or a declaration. 1680 diag::kind PrevDiag; 1681 if (Old->isThisDeclarationADefinition()) 1682 PrevDiag = diag::note_previous_definition; 1683 else if (Old->isImplicit()) 1684 PrevDiag = diag::note_previous_implicit_declaration; 1685 else 1686 PrevDiag = diag::note_previous_declaration; 1687 1688 QualType OldQType = Context.getCanonicalType(Old->getType()); 1689 QualType NewQType = Context.getCanonicalType(New->getType()); 1690 1691 // Don't complain about this if we're in GNU89 mode and the old function 1692 // is an extern inline function. 1693 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1694 New->getStorageClass() == SC_Static && 1695 Old->getStorageClass() != SC_Static && 1696 !canRedefineFunction(Old, getLangOptions())) { 1697 if (getLangOptions().MicrosoftExt) { 1698 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1699 Diag(Old->getLocation(), PrevDiag); 1700 } else { 1701 Diag(New->getLocation(), diag::err_static_non_static) << New; 1702 Diag(Old->getLocation(), PrevDiag); 1703 return true; 1704 } 1705 } 1706 1707 // If a function is first declared with a calling convention, but is 1708 // later declared or defined without one, the second decl assumes the 1709 // calling convention of the first. 1710 // 1711 // For the new decl, we have to look at the NON-canonical type to tell the 1712 // difference between a function that really doesn't have a calling 1713 // convention and one that is declared cdecl. That's because in 1714 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1715 // because it is the default calling convention. 1716 // 1717 // Note also that we DO NOT return at this point, because we still have 1718 // other tests to run. 1719 const FunctionType *OldType = cast<FunctionType>(OldQType); 1720 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1721 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1722 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1723 bool RequiresAdjustment = false; 1724 if (OldTypeInfo.getCC() != CC_Default && 1725 NewTypeInfo.getCC() == CC_Default) { 1726 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1727 RequiresAdjustment = true; 1728 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1729 NewTypeInfo.getCC())) { 1730 // Calling conventions really aren't compatible, so complain. 1731 Diag(New->getLocation(), diag::err_cconv_change) 1732 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1733 << (OldTypeInfo.getCC() == CC_Default) 1734 << (OldTypeInfo.getCC() == CC_Default ? "" : 1735 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1736 Diag(Old->getLocation(), diag::note_previous_declaration); 1737 return true; 1738 } 1739 1740 // FIXME: diagnose the other way around? 1741 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1742 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1743 RequiresAdjustment = true; 1744 } 1745 1746 // Merge regparm attribute. 1747 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1748 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1749 if (NewTypeInfo.getHasRegParm()) { 1750 Diag(New->getLocation(), diag::err_regparm_mismatch) 1751 << NewType->getRegParmType() 1752 << OldType->getRegParmType(); 1753 Diag(Old->getLocation(), diag::note_previous_declaration); 1754 return true; 1755 } 1756 1757 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1758 RequiresAdjustment = true; 1759 } 1760 1761 // Merge ns_returns_retained attribute. 1762 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1763 if (NewTypeInfo.getProducesResult()) { 1764 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1765 Diag(Old->getLocation(), diag::note_previous_declaration); 1766 return true; 1767 } 1768 1769 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1770 RequiresAdjustment = true; 1771 } 1772 1773 if (RequiresAdjustment) { 1774 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1775 New->setType(QualType(NewType, 0)); 1776 NewQType = Context.getCanonicalType(New->getType()); 1777 } 1778 1779 if (getLangOptions().CPlusPlus) { 1780 // (C++98 13.1p2): 1781 // Certain function declarations cannot be overloaded: 1782 // -- Function declarations that differ only in the return type 1783 // cannot be overloaded. 1784 QualType OldReturnType = OldType->getResultType(); 1785 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1786 QualType ResQT; 1787 if (OldReturnType != NewReturnType) { 1788 if (NewReturnType->isObjCObjectPointerType() 1789 && OldReturnType->isObjCObjectPointerType()) 1790 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1791 if (ResQT.isNull()) { 1792 if (New->isCXXClassMember() && New->isOutOfLine()) 1793 Diag(New->getLocation(), 1794 diag::err_member_def_does_not_match_ret_type) << New; 1795 else 1796 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1797 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1798 return true; 1799 } 1800 else 1801 NewQType = ResQT; 1802 } 1803 1804 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1805 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1806 if (OldMethod && NewMethod) { 1807 // Preserve triviality. 1808 NewMethod->setTrivial(OldMethod->isTrivial()); 1809 1810 // MSVC allows explicit template specialization at class scope: 1811 // 2 CXMethodDecls referring to the same function will be injected. 1812 // We don't want a redeclartion error. 1813 bool IsClassScopeExplicitSpecialization = 1814 OldMethod->isFunctionTemplateSpecialization() && 1815 NewMethod->isFunctionTemplateSpecialization(); 1816 bool isFriend = NewMethod->getFriendObjectKind(); 1817 1818 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1819 !IsClassScopeExplicitSpecialization) { 1820 // -- Member function declarations with the same name and the 1821 // same parameter types cannot be overloaded if any of them 1822 // is a static member function declaration. 1823 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1824 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1825 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1826 return true; 1827 } 1828 1829 // C++ [class.mem]p1: 1830 // [...] A member shall not be declared twice in the 1831 // member-specification, except that a nested class or member 1832 // class template can be declared and then later defined. 1833 unsigned NewDiag; 1834 if (isa<CXXConstructorDecl>(OldMethod)) 1835 NewDiag = diag::err_constructor_redeclared; 1836 else if (isa<CXXDestructorDecl>(NewMethod)) 1837 NewDiag = diag::err_destructor_redeclared; 1838 else if (isa<CXXConversionDecl>(NewMethod)) 1839 NewDiag = diag::err_conv_function_redeclared; 1840 else 1841 NewDiag = diag::err_member_redeclared; 1842 1843 Diag(New->getLocation(), NewDiag); 1844 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1845 1846 // Complain if this is an explicit declaration of a special 1847 // member that was initially declared implicitly. 1848 // 1849 // As an exception, it's okay to befriend such methods in order 1850 // to permit the implicit constructor/destructor/operator calls. 1851 } else if (OldMethod->isImplicit()) { 1852 if (isFriend) { 1853 NewMethod->setImplicit(); 1854 } else { 1855 Diag(NewMethod->getLocation(), 1856 diag::err_definition_of_implicitly_declared_member) 1857 << New << getSpecialMember(OldMethod); 1858 return true; 1859 } 1860 } else if (OldMethod->isExplicitlyDefaulted()) { 1861 Diag(NewMethod->getLocation(), 1862 diag::err_definition_of_explicitly_defaulted_member) 1863 << getSpecialMember(OldMethod); 1864 return true; 1865 } 1866 } 1867 1868 // (C++98 8.3.5p3): 1869 // All declarations for a function shall agree exactly in both the 1870 // return type and the parameter-type-list. 1871 // We also want to respect all the extended bits except noreturn. 1872 1873 // noreturn should now match unless the old type info didn't have it. 1874 QualType OldQTypeForComparison = OldQType; 1875 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1876 assert(OldQType == QualType(OldType, 0)); 1877 const FunctionType *OldTypeForComparison 1878 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1879 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1880 assert(OldQTypeForComparison.isCanonical()); 1881 } 1882 1883 if (OldQTypeForComparison == NewQType) 1884 return MergeCompatibleFunctionDecls(New, Old); 1885 1886 // Fall through for conflicting redeclarations and redefinitions. 1887 } 1888 1889 // C: Function types need to be compatible, not identical. This handles 1890 // duplicate function decls like "void f(int); void f(enum X);" properly. 1891 if (!getLangOptions().CPlusPlus && 1892 Context.typesAreCompatible(OldQType, NewQType)) { 1893 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1894 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1895 const FunctionProtoType *OldProto = 0; 1896 if (isa<FunctionNoProtoType>(NewFuncType) && 1897 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1898 // The old declaration provided a function prototype, but the 1899 // new declaration does not. Merge in the prototype. 1900 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1901 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1902 OldProto->arg_type_end()); 1903 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1904 ParamTypes.data(), ParamTypes.size(), 1905 OldProto->getExtProtoInfo()); 1906 New->setType(NewQType); 1907 New->setHasInheritedPrototype(); 1908 1909 // Synthesize a parameter for each argument type. 1910 SmallVector<ParmVarDecl*, 16> Params; 1911 for (FunctionProtoType::arg_type_iterator 1912 ParamType = OldProto->arg_type_begin(), 1913 ParamEnd = OldProto->arg_type_end(); 1914 ParamType != ParamEnd; ++ParamType) { 1915 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1916 SourceLocation(), 1917 SourceLocation(), 0, 1918 *ParamType, /*TInfo=*/0, 1919 SC_None, SC_None, 1920 0); 1921 Param->setScopeInfo(0, Params.size()); 1922 Param->setImplicit(); 1923 Params.push_back(Param); 1924 } 1925 1926 New->setParams(Params); 1927 } 1928 1929 return MergeCompatibleFunctionDecls(New, Old); 1930 } 1931 1932 // GNU C permits a K&R definition to follow a prototype declaration 1933 // if the declared types of the parameters in the K&R definition 1934 // match the types in the prototype declaration, even when the 1935 // promoted types of the parameters from the K&R definition differ 1936 // from the types in the prototype. GCC then keeps the types from 1937 // the prototype. 1938 // 1939 // If a variadic prototype is followed by a non-variadic K&R definition, 1940 // the K&R definition becomes variadic. This is sort of an edge case, but 1941 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1942 // C99 6.9.1p8. 1943 if (!getLangOptions().CPlusPlus && 1944 Old->hasPrototype() && !New->hasPrototype() && 1945 New->getType()->getAs<FunctionProtoType>() && 1946 Old->getNumParams() == New->getNumParams()) { 1947 SmallVector<QualType, 16> ArgTypes; 1948 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1949 const FunctionProtoType *OldProto 1950 = Old->getType()->getAs<FunctionProtoType>(); 1951 const FunctionProtoType *NewProto 1952 = New->getType()->getAs<FunctionProtoType>(); 1953 1954 // Determine whether this is the GNU C extension. 1955 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1956 NewProto->getResultType()); 1957 bool LooseCompatible = !MergedReturn.isNull(); 1958 for (unsigned Idx = 0, End = Old->getNumParams(); 1959 LooseCompatible && Idx != End; ++Idx) { 1960 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1961 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1962 if (Context.typesAreCompatible(OldParm->getType(), 1963 NewProto->getArgType(Idx))) { 1964 ArgTypes.push_back(NewParm->getType()); 1965 } else if (Context.typesAreCompatible(OldParm->getType(), 1966 NewParm->getType(), 1967 /*CompareUnqualified=*/true)) { 1968 GNUCompatibleParamWarning Warn 1969 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1970 Warnings.push_back(Warn); 1971 ArgTypes.push_back(NewParm->getType()); 1972 } else 1973 LooseCompatible = false; 1974 } 1975 1976 if (LooseCompatible) { 1977 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1978 Diag(Warnings[Warn].NewParm->getLocation(), 1979 diag::ext_param_promoted_not_compatible_with_prototype) 1980 << Warnings[Warn].PromotedType 1981 << Warnings[Warn].OldParm->getType(); 1982 if (Warnings[Warn].OldParm->getLocation().isValid()) 1983 Diag(Warnings[Warn].OldParm->getLocation(), 1984 diag::note_previous_declaration); 1985 } 1986 1987 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1988 ArgTypes.size(), 1989 OldProto->getExtProtoInfo())); 1990 return MergeCompatibleFunctionDecls(New, Old); 1991 } 1992 1993 // Fall through to diagnose conflicting types. 1994 } 1995 1996 // A function that has already been declared has been redeclared or defined 1997 // with a different type- show appropriate diagnostic 1998 if (unsigned BuiltinID = Old->getBuiltinID()) { 1999 // The user has declared a builtin function with an incompatible 2000 // signature. 2001 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2002 // The function the user is redeclaring is a library-defined 2003 // function like 'malloc' or 'printf'. Warn about the 2004 // redeclaration, then pretend that we don't know about this 2005 // library built-in. 2006 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2007 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2008 << Old << Old->getType(); 2009 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2010 Old->setInvalidDecl(); 2011 return false; 2012 } 2013 2014 PrevDiag = diag::note_previous_builtin_declaration; 2015 } 2016 2017 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2018 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2019 return true; 2020} 2021 2022/// \brief Completes the merge of two function declarations that are 2023/// known to be compatible. 2024/// 2025/// This routine handles the merging of attributes and other 2026/// properties of function declarations form the old declaration to 2027/// the new declaration, once we know that New is in fact a 2028/// redeclaration of Old. 2029/// 2030/// \returns false 2031bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2032 // Merge the attributes 2033 mergeDeclAttributes(New, Old, Context); 2034 2035 // Merge the storage class. 2036 if (Old->getStorageClass() != SC_Extern && 2037 Old->getStorageClass() != SC_None) 2038 New->setStorageClass(Old->getStorageClass()); 2039 2040 // Merge "pure" flag. 2041 if (Old->isPure()) 2042 New->setPure(); 2043 2044 // Merge attributes from the parameters. These can mismatch with K&R 2045 // declarations. 2046 if (New->getNumParams() == Old->getNumParams()) 2047 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2048 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2049 Context); 2050 2051 if (getLangOptions().CPlusPlus) 2052 return MergeCXXFunctionDecl(New, Old); 2053 2054 return false; 2055} 2056 2057 2058void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2059 const ObjCMethodDecl *oldMethod) { 2060 // We don't want to merge unavailable and deprecated attributes 2061 // except from interface to implementation. 2062 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2063 2064 // Merge the attributes. 2065 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2066 2067 // Merge attributes from the parameters. 2068 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2069 for (ObjCMethodDecl::param_iterator 2070 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2071 ni != ne; ++ni, ++oi) 2072 mergeParamDeclAttributes(*ni, *oi, Context); 2073 2074 CheckObjCMethodOverride(newMethod, oldMethod, true); 2075} 2076 2077/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2078/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2079/// emitting diagnostics as appropriate. 2080/// 2081/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2082/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2083/// check them before the initializer is attached. 2084/// 2085void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2086 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2087 return; 2088 2089 QualType MergedT; 2090 if (getLangOptions().CPlusPlus) { 2091 AutoType *AT = New->getType()->getContainedAutoType(); 2092 if (AT && !AT->isDeduced()) { 2093 // We don't know what the new type is until the initializer is attached. 2094 return; 2095 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2096 // These could still be something that needs exception specs checked. 2097 return MergeVarDeclExceptionSpecs(New, Old); 2098 } 2099 // C++ [basic.link]p10: 2100 // [...] the types specified by all declarations referring to a given 2101 // object or function shall be identical, except that declarations for an 2102 // array object can specify array types that differ by the presence or 2103 // absence of a major array bound (8.3.4). 2104 else if (Old->getType()->isIncompleteArrayType() && 2105 New->getType()->isArrayType()) { 2106 CanQual<ArrayType> OldArray 2107 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2108 CanQual<ArrayType> NewArray 2109 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2110 if (OldArray->getElementType() == NewArray->getElementType()) 2111 MergedT = New->getType(); 2112 } else if (Old->getType()->isArrayType() && 2113 New->getType()->isIncompleteArrayType()) { 2114 CanQual<ArrayType> OldArray 2115 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2116 CanQual<ArrayType> NewArray 2117 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2118 if (OldArray->getElementType() == NewArray->getElementType()) 2119 MergedT = Old->getType(); 2120 } else if (New->getType()->isObjCObjectPointerType() 2121 && Old->getType()->isObjCObjectPointerType()) { 2122 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2123 Old->getType()); 2124 } 2125 } else { 2126 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2127 } 2128 if (MergedT.isNull()) { 2129 Diag(New->getLocation(), diag::err_redefinition_different_type) 2130 << New->getDeclName(); 2131 Diag(Old->getLocation(), diag::note_previous_definition); 2132 return New->setInvalidDecl(); 2133 } 2134 New->setType(MergedT); 2135} 2136 2137/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2138/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2139/// situation, merging decls or emitting diagnostics as appropriate. 2140/// 2141/// Tentative definition rules (C99 6.9.2p2) are checked by 2142/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2143/// definitions here, since the initializer hasn't been attached. 2144/// 2145void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2146 // If the new decl is already invalid, don't do any other checking. 2147 if (New->isInvalidDecl()) 2148 return; 2149 2150 // Verify the old decl was also a variable. 2151 VarDecl *Old = 0; 2152 if (!Previous.isSingleResult() || 2153 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2154 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2155 << New->getDeclName(); 2156 Diag(Previous.getRepresentativeDecl()->getLocation(), 2157 diag::note_previous_definition); 2158 return New->setInvalidDecl(); 2159 } 2160 2161 // C++ [class.mem]p1: 2162 // A member shall not be declared twice in the member-specification [...] 2163 // 2164 // Here, we need only consider static data members. 2165 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2166 Diag(New->getLocation(), diag::err_duplicate_member) 2167 << New->getIdentifier(); 2168 Diag(Old->getLocation(), diag::note_previous_declaration); 2169 New->setInvalidDecl(); 2170 } 2171 2172 mergeDeclAttributes(New, Old, Context); 2173 // Warn if an already-declared variable is made a weak_import in a subsequent 2174 // declaration 2175 if (New->getAttr<WeakImportAttr>() && 2176 Old->getStorageClass() == SC_None && 2177 !Old->getAttr<WeakImportAttr>()) { 2178 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2179 Diag(Old->getLocation(), diag::note_previous_definition); 2180 // Remove weak_import attribute on new declaration. 2181 New->dropAttr<WeakImportAttr>(); 2182 } 2183 2184 // Merge the types. 2185 MergeVarDeclTypes(New, Old); 2186 if (New->isInvalidDecl()) 2187 return; 2188 2189 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2190 if (New->getStorageClass() == SC_Static && 2191 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2192 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2193 Diag(Old->getLocation(), diag::note_previous_definition); 2194 return New->setInvalidDecl(); 2195 } 2196 // C99 6.2.2p4: 2197 // For an identifier declared with the storage-class specifier 2198 // extern in a scope in which a prior declaration of that 2199 // identifier is visible,23) if the prior declaration specifies 2200 // internal or external linkage, the linkage of the identifier at 2201 // the later declaration is the same as the linkage specified at 2202 // the prior declaration. If no prior declaration is visible, or 2203 // if the prior declaration specifies no linkage, then the 2204 // identifier has external linkage. 2205 if (New->hasExternalStorage() && Old->hasLinkage()) 2206 /* Okay */; 2207 else if (New->getStorageClass() != SC_Static && 2208 Old->getStorageClass() == SC_Static) { 2209 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2210 Diag(Old->getLocation(), diag::note_previous_definition); 2211 return New->setInvalidDecl(); 2212 } 2213 2214 // Check if extern is followed by non-extern and vice-versa. 2215 if (New->hasExternalStorage() && 2216 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2217 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2218 Diag(Old->getLocation(), diag::note_previous_definition); 2219 return New->setInvalidDecl(); 2220 } 2221 if (Old->hasExternalStorage() && 2222 !New->hasLinkage() && New->isLocalVarDecl()) { 2223 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2224 Diag(Old->getLocation(), diag::note_previous_definition); 2225 return New->setInvalidDecl(); 2226 } 2227 2228 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2229 2230 // FIXME: The test for external storage here seems wrong? We still 2231 // need to check for mismatches. 2232 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2233 // Don't complain about out-of-line definitions of static members. 2234 !(Old->getLexicalDeclContext()->isRecord() && 2235 !New->getLexicalDeclContext()->isRecord())) { 2236 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2237 Diag(Old->getLocation(), diag::note_previous_definition); 2238 return New->setInvalidDecl(); 2239 } 2240 2241 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2242 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2243 Diag(Old->getLocation(), diag::note_previous_definition); 2244 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2245 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2246 Diag(Old->getLocation(), diag::note_previous_definition); 2247 } 2248 2249 // C++ doesn't have tentative definitions, so go right ahead and check here. 2250 const VarDecl *Def; 2251 if (getLangOptions().CPlusPlus && 2252 New->isThisDeclarationADefinition() == VarDecl::Definition && 2253 (Def = Old->getDefinition())) { 2254 Diag(New->getLocation(), diag::err_redefinition) 2255 << New->getDeclName(); 2256 Diag(Def->getLocation(), diag::note_previous_definition); 2257 New->setInvalidDecl(); 2258 return; 2259 } 2260 // c99 6.2.2 P4. 2261 // For an identifier declared with the storage-class specifier extern in a 2262 // scope in which a prior declaration of that identifier is visible, if 2263 // the prior declaration specifies internal or external linkage, the linkage 2264 // of the identifier at the later declaration is the same as the linkage 2265 // specified at the prior declaration. 2266 // FIXME. revisit this code. 2267 if (New->hasExternalStorage() && 2268 Old->getLinkage() == InternalLinkage && 2269 New->getDeclContext() == Old->getDeclContext()) 2270 New->setStorageClass(Old->getStorageClass()); 2271 2272 // Keep a chain of previous declarations. 2273 New->setPreviousDeclaration(Old); 2274 2275 // Inherit access appropriately. 2276 New->setAccess(Old->getAccess()); 2277} 2278 2279/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2280/// no declarator (e.g. "struct foo;") is parsed. 2281Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2282 DeclSpec &DS) { 2283 return ParsedFreeStandingDeclSpec(S, AS, DS, 2284 MultiTemplateParamsArg(*this, 0, 0)); 2285} 2286 2287/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2288/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2289/// parameters to cope with template friend declarations. 2290Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2291 DeclSpec &DS, 2292 MultiTemplateParamsArg TemplateParams) { 2293 Decl *TagD = 0; 2294 TagDecl *Tag = 0; 2295 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2296 DS.getTypeSpecType() == DeclSpec::TST_struct || 2297 DS.getTypeSpecType() == DeclSpec::TST_union || 2298 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2299 TagD = DS.getRepAsDecl(); 2300 2301 if (!TagD) // We probably had an error 2302 return 0; 2303 2304 // Note that the above type specs guarantee that the 2305 // type rep is a Decl, whereas in many of the others 2306 // it's a Type. 2307 if (isa<TagDecl>(TagD)) 2308 Tag = cast<TagDecl>(TagD); 2309 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2310 Tag = CTD->getTemplatedDecl(); 2311 } 2312 2313 if (Tag) 2314 Tag->setFreeStanding(); 2315 2316 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2317 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2318 // or incomplete types shall not be restrict-qualified." 2319 if (TypeQuals & DeclSpec::TQ_restrict) 2320 Diag(DS.getRestrictSpecLoc(), 2321 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2322 << DS.getSourceRange(); 2323 } 2324 2325 if (DS.isConstexprSpecified()) { 2326 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2327 // and definitions of functions and variables. 2328 if (Tag) 2329 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2330 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2331 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2332 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2333 else 2334 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2335 // Don't emit warnings after this error. 2336 return TagD; 2337 } 2338 2339 if (DS.isFriendSpecified()) { 2340 // If we're dealing with a decl but not a TagDecl, assume that 2341 // whatever routines created it handled the friendship aspect. 2342 if (TagD && !Tag) 2343 return 0; 2344 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2345 } 2346 2347 // Track whether we warned about the fact that there aren't any 2348 // declarators. 2349 bool emittedWarning = false; 2350 2351 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2352 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2353 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2354 if (getLangOptions().CPlusPlus || 2355 Record->getDeclContext()->isRecord()) 2356 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2357 2358 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2359 << DS.getSourceRange(); 2360 emittedWarning = true; 2361 } 2362 } 2363 2364 // Check for Microsoft C extension: anonymous struct. 2365 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2366 CurContext->isRecord() && 2367 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2368 // Handle 2 kinds of anonymous struct: 2369 // struct STRUCT; 2370 // and 2371 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2372 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2373 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2374 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2375 DS.getRepAsType().get()->isStructureType())) { 2376 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2377 << DS.getSourceRange(); 2378 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2379 } 2380 } 2381 2382 if (getLangOptions().CPlusPlus && 2383 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2384 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2385 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2386 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2387 Diag(Enum->getLocation(), diag::ext_no_declarators) 2388 << DS.getSourceRange(); 2389 emittedWarning = true; 2390 } 2391 2392 // Skip all the checks below if we have a type error. 2393 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2394 2395 if (!DS.isMissingDeclaratorOk()) { 2396 // Warn about typedefs of enums without names, since this is an 2397 // extension in both Microsoft and GNU. 2398 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2399 Tag && isa<EnumDecl>(Tag)) { 2400 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2401 << DS.getSourceRange(); 2402 return Tag; 2403 } 2404 2405 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2406 << DS.getSourceRange(); 2407 emittedWarning = true; 2408 } 2409 2410 // We're going to complain about a bunch of spurious specifiers; 2411 // only do this if we're declaring a tag, because otherwise we 2412 // should be getting diag::ext_no_declarators. 2413 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2414 return TagD; 2415 2416 // Note that a linkage-specification sets a storage class, but 2417 // 'extern "C" struct foo;' is actually valid and not theoretically 2418 // useless. 2419 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2420 if (!DS.isExternInLinkageSpec()) 2421 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2422 << DeclSpec::getSpecifierName(scs); 2423 2424 if (DS.isThreadSpecified()) 2425 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2426 if (DS.getTypeQualifiers()) { 2427 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2428 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2429 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2430 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2431 // Restrict is covered above. 2432 } 2433 if (DS.isInlineSpecified()) 2434 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2435 if (DS.isVirtualSpecified()) 2436 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2437 if (DS.isExplicitSpecified()) 2438 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2439 2440 if (DS.isModulePrivateSpecified() && 2441 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2442 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2443 << Tag->getTagKind() 2444 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2445 2446 // Warn about ignored type attributes, for example: 2447 // __attribute__((aligned)) struct A; 2448 // Attributes should be placed after tag to apply to type declaration. 2449 if (!DS.getAttributes().empty()) { 2450 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2451 if (TypeSpecType == DeclSpec::TST_class || 2452 TypeSpecType == DeclSpec::TST_struct || 2453 TypeSpecType == DeclSpec::TST_union || 2454 TypeSpecType == DeclSpec::TST_enum) { 2455 AttributeList* attrs = DS.getAttributes().getList(); 2456 while (attrs) { 2457 Diag(attrs->getScopeLoc(), 2458 diag::warn_declspec_attribute_ignored) 2459 << attrs->getName() 2460 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2461 TypeSpecType == DeclSpec::TST_struct ? 1 : 2462 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2463 attrs = attrs->getNext(); 2464 } 2465 } 2466 } 2467 2468 return TagD; 2469} 2470 2471/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2472/// builds a statement for it and returns it so it is evaluated. 2473StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2474 StmtResult R; 2475 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2476 Expr *Exp = DS.getRepAsExpr(); 2477 QualType Ty = Exp->getType(); 2478 if (Ty->isPointerType()) { 2479 do 2480 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2481 while (Ty->isPointerType()); 2482 } 2483 if (Ty->isVariableArrayType()) { 2484 R = ActOnExprStmt(MakeFullExpr(Exp)); 2485 } 2486 } 2487 return R; 2488} 2489 2490/// We are trying to inject an anonymous member into the given scope; 2491/// check if there's an existing declaration that can't be overloaded. 2492/// 2493/// \return true if this is a forbidden redeclaration 2494static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2495 Scope *S, 2496 DeclContext *Owner, 2497 DeclarationName Name, 2498 SourceLocation NameLoc, 2499 unsigned diagnostic) { 2500 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2501 Sema::ForRedeclaration); 2502 if (!SemaRef.LookupName(R, S)) return false; 2503 2504 if (R.getAsSingle<TagDecl>()) 2505 return false; 2506 2507 // Pick a representative declaration. 2508 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2509 assert(PrevDecl && "Expected a non-null Decl"); 2510 2511 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2512 return false; 2513 2514 SemaRef.Diag(NameLoc, diagnostic) << Name; 2515 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2516 2517 return true; 2518} 2519 2520/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2521/// anonymous struct or union AnonRecord into the owning context Owner 2522/// and scope S. This routine will be invoked just after we realize 2523/// that an unnamed union or struct is actually an anonymous union or 2524/// struct, e.g., 2525/// 2526/// @code 2527/// union { 2528/// int i; 2529/// float f; 2530/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2531/// // f into the surrounding scope.x 2532/// @endcode 2533/// 2534/// This routine is recursive, injecting the names of nested anonymous 2535/// structs/unions into the owning context and scope as well. 2536static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2537 DeclContext *Owner, 2538 RecordDecl *AnonRecord, 2539 AccessSpecifier AS, 2540 SmallVector<NamedDecl*, 2> &Chaining, 2541 bool MSAnonStruct) { 2542 unsigned diagKind 2543 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2544 : diag::err_anonymous_struct_member_redecl; 2545 2546 bool Invalid = false; 2547 2548 // Look every FieldDecl and IndirectFieldDecl with a name. 2549 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2550 DEnd = AnonRecord->decls_end(); 2551 D != DEnd; ++D) { 2552 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2553 cast<NamedDecl>(*D)->getDeclName()) { 2554 ValueDecl *VD = cast<ValueDecl>(*D); 2555 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2556 VD->getLocation(), diagKind)) { 2557 // C++ [class.union]p2: 2558 // The names of the members of an anonymous union shall be 2559 // distinct from the names of any other entity in the 2560 // scope in which the anonymous union is declared. 2561 Invalid = true; 2562 } else { 2563 // C++ [class.union]p2: 2564 // For the purpose of name lookup, after the anonymous union 2565 // definition, the members of the anonymous union are 2566 // considered to have been defined in the scope in which the 2567 // anonymous union is declared. 2568 unsigned OldChainingSize = Chaining.size(); 2569 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2570 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2571 PE = IF->chain_end(); PI != PE; ++PI) 2572 Chaining.push_back(*PI); 2573 else 2574 Chaining.push_back(VD); 2575 2576 assert(Chaining.size() >= 2); 2577 NamedDecl **NamedChain = 2578 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2579 for (unsigned i = 0; i < Chaining.size(); i++) 2580 NamedChain[i] = Chaining[i]; 2581 2582 IndirectFieldDecl* IndirectField = 2583 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2584 VD->getIdentifier(), VD->getType(), 2585 NamedChain, Chaining.size()); 2586 2587 IndirectField->setAccess(AS); 2588 IndirectField->setImplicit(); 2589 SemaRef.PushOnScopeChains(IndirectField, S); 2590 2591 // That includes picking up the appropriate access specifier. 2592 if (AS != AS_none) IndirectField->setAccess(AS); 2593 2594 Chaining.resize(OldChainingSize); 2595 } 2596 } 2597 } 2598 2599 return Invalid; 2600} 2601 2602/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2603/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2604/// illegal input values are mapped to SC_None. 2605static StorageClass 2606StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2607 switch (StorageClassSpec) { 2608 case DeclSpec::SCS_unspecified: return SC_None; 2609 case DeclSpec::SCS_extern: return SC_Extern; 2610 case DeclSpec::SCS_static: return SC_Static; 2611 case DeclSpec::SCS_auto: return SC_Auto; 2612 case DeclSpec::SCS_register: return SC_Register; 2613 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2614 // Illegal SCSs map to None: error reporting is up to the caller. 2615 case DeclSpec::SCS_mutable: // Fall through. 2616 case DeclSpec::SCS_typedef: return SC_None; 2617 } 2618 llvm_unreachable("unknown storage class specifier"); 2619} 2620 2621/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2622/// a StorageClass. Any error reporting is up to the caller: 2623/// illegal input values are mapped to SC_None. 2624static StorageClass 2625StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2626 switch (StorageClassSpec) { 2627 case DeclSpec::SCS_unspecified: return SC_None; 2628 case DeclSpec::SCS_extern: return SC_Extern; 2629 case DeclSpec::SCS_static: return SC_Static; 2630 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2631 // Illegal SCSs map to None: error reporting is up to the caller. 2632 case DeclSpec::SCS_auto: // Fall through. 2633 case DeclSpec::SCS_mutable: // Fall through. 2634 case DeclSpec::SCS_register: // Fall through. 2635 case DeclSpec::SCS_typedef: return SC_None; 2636 } 2637 llvm_unreachable("unknown storage class specifier"); 2638} 2639 2640/// BuildAnonymousStructOrUnion - Handle the declaration of an 2641/// anonymous structure or union. Anonymous unions are a C++ feature 2642/// (C++ [class.union]) and a GNU C extension; anonymous structures 2643/// are a GNU C and GNU C++ extension. 2644Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2645 AccessSpecifier AS, 2646 RecordDecl *Record) { 2647 DeclContext *Owner = Record->getDeclContext(); 2648 2649 // Diagnose whether this anonymous struct/union is an extension. 2650 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2651 Diag(Record->getLocation(), diag::ext_anonymous_union); 2652 else if (!Record->isUnion()) 2653 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2654 2655 // C and C++ require different kinds of checks for anonymous 2656 // structs/unions. 2657 bool Invalid = false; 2658 if (getLangOptions().CPlusPlus) { 2659 const char* PrevSpec = 0; 2660 unsigned DiagID; 2661 if (Record->isUnion()) { 2662 // C++ [class.union]p6: 2663 // Anonymous unions declared in a named namespace or in the 2664 // global namespace shall be declared static. 2665 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2666 (isa<TranslationUnitDecl>(Owner) || 2667 (isa<NamespaceDecl>(Owner) && 2668 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2669 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2670 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2671 2672 // Recover by adding 'static'. 2673 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2674 PrevSpec, DiagID); 2675 } 2676 // C++ [class.union]p6: 2677 // A storage class is not allowed in a declaration of an 2678 // anonymous union in a class scope. 2679 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2680 isa<RecordDecl>(Owner)) { 2681 Diag(DS.getStorageClassSpecLoc(), 2682 diag::err_anonymous_union_with_storage_spec) 2683 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2684 2685 // Recover by removing the storage specifier. 2686 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2687 SourceLocation(), 2688 PrevSpec, DiagID); 2689 } 2690 } 2691 2692 // Ignore const/volatile/restrict qualifiers. 2693 if (DS.getTypeQualifiers()) { 2694 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2695 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2696 << Record->isUnion() << 0 2697 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2698 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2699 Diag(DS.getVolatileSpecLoc(), 2700 diag::ext_anonymous_struct_union_qualified) 2701 << Record->isUnion() << 1 2702 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2703 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2704 Diag(DS.getRestrictSpecLoc(), 2705 diag::ext_anonymous_struct_union_qualified) 2706 << Record->isUnion() << 2 2707 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2708 2709 DS.ClearTypeQualifiers(); 2710 } 2711 2712 // C++ [class.union]p2: 2713 // The member-specification of an anonymous union shall only 2714 // define non-static data members. [Note: nested types and 2715 // functions cannot be declared within an anonymous union. ] 2716 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2717 MemEnd = Record->decls_end(); 2718 Mem != MemEnd; ++Mem) { 2719 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2720 // C++ [class.union]p3: 2721 // An anonymous union shall not have private or protected 2722 // members (clause 11). 2723 assert(FD->getAccess() != AS_none); 2724 if (FD->getAccess() != AS_public) { 2725 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2726 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2727 Invalid = true; 2728 } 2729 2730 // C++ [class.union]p1 2731 // An object of a class with a non-trivial constructor, a non-trivial 2732 // copy constructor, a non-trivial destructor, or a non-trivial copy 2733 // assignment operator cannot be a member of a union, nor can an 2734 // array of such objects. 2735 if (CheckNontrivialField(FD)) 2736 Invalid = true; 2737 } else if ((*Mem)->isImplicit()) { 2738 // Any implicit members are fine. 2739 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2740 // This is a type that showed up in an 2741 // elaborated-type-specifier inside the anonymous struct or 2742 // union, but which actually declares a type outside of the 2743 // anonymous struct or union. It's okay. 2744 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2745 if (!MemRecord->isAnonymousStructOrUnion() && 2746 MemRecord->getDeclName()) { 2747 // Visual C++ allows type definition in anonymous struct or union. 2748 if (getLangOptions().MicrosoftExt) 2749 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2750 << (int)Record->isUnion(); 2751 else { 2752 // This is a nested type declaration. 2753 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2754 << (int)Record->isUnion(); 2755 Invalid = true; 2756 } 2757 } 2758 } else if (isa<AccessSpecDecl>(*Mem)) { 2759 // Any access specifier is fine. 2760 } else { 2761 // We have something that isn't a non-static data 2762 // member. Complain about it. 2763 unsigned DK = diag::err_anonymous_record_bad_member; 2764 if (isa<TypeDecl>(*Mem)) 2765 DK = diag::err_anonymous_record_with_type; 2766 else if (isa<FunctionDecl>(*Mem)) 2767 DK = diag::err_anonymous_record_with_function; 2768 else if (isa<VarDecl>(*Mem)) 2769 DK = diag::err_anonymous_record_with_static; 2770 2771 // Visual C++ allows type definition in anonymous struct or union. 2772 if (getLangOptions().MicrosoftExt && 2773 DK == diag::err_anonymous_record_with_type) 2774 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2775 << (int)Record->isUnion(); 2776 else { 2777 Diag((*Mem)->getLocation(), DK) 2778 << (int)Record->isUnion(); 2779 Invalid = true; 2780 } 2781 } 2782 } 2783 } 2784 2785 if (!Record->isUnion() && !Owner->isRecord()) { 2786 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2787 << (int)getLangOptions().CPlusPlus; 2788 Invalid = true; 2789 } 2790 2791 // Mock up a declarator. 2792 Declarator Dc(DS, Declarator::MemberContext); 2793 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2794 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2795 2796 // Create a declaration for this anonymous struct/union. 2797 NamedDecl *Anon = 0; 2798 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2799 Anon = FieldDecl::Create(Context, OwningClass, 2800 DS.getSourceRange().getBegin(), 2801 Record->getLocation(), 2802 /*IdentifierInfo=*/0, 2803 Context.getTypeDeclType(Record), 2804 TInfo, 2805 /*BitWidth=*/0, /*Mutable=*/false, 2806 /*HasInit=*/false); 2807 Anon->setAccess(AS); 2808 if (getLangOptions().CPlusPlus) 2809 FieldCollector->Add(cast<FieldDecl>(Anon)); 2810 } else { 2811 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2812 assert(SCSpec != DeclSpec::SCS_typedef && 2813 "Parser allowed 'typedef' as storage class VarDecl."); 2814 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2815 if (SCSpec == DeclSpec::SCS_mutable) { 2816 // mutable can only appear on non-static class members, so it's always 2817 // an error here 2818 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2819 Invalid = true; 2820 SC = SC_None; 2821 } 2822 SCSpec = DS.getStorageClassSpecAsWritten(); 2823 VarDecl::StorageClass SCAsWritten 2824 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2825 2826 Anon = VarDecl::Create(Context, Owner, 2827 DS.getSourceRange().getBegin(), 2828 Record->getLocation(), /*IdentifierInfo=*/0, 2829 Context.getTypeDeclType(Record), 2830 TInfo, SC, SCAsWritten); 2831 2832 // Default-initialize the implicit variable. This initialization will be 2833 // trivial in almost all cases, except if a union member has an in-class 2834 // initializer: 2835 // union { int n = 0; }; 2836 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2837 } 2838 Anon->setImplicit(); 2839 2840 // Add the anonymous struct/union object to the current 2841 // context. We'll be referencing this object when we refer to one of 2842 // its members. 2843 Owner->addDecl(Anon); 2844 2845 // Inject the members of the anonymous struct/union into the owning 2846 // context and into the identifier resolver chain for name lookup 2847 // purposes. 2848 SmallVector<NamedDecl*, 2> Chain; 2849 Chain.push_back(Anon); 2850 2851 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2852 Chain, false)) 2853 Invalid = true; 2854 2855 // Mark this as an anonymous struct/union type. Note that we do not 2856 // do this until after we have already checked and injected the 2857 // members of this anonymous struct/union type, because otherwise 2858 // the members could be injected twice: once by DeclContext when it 2859 // builds its lookup table, and once by 2860 // InjectAnonymousStructOrUnionMembers. 2861 Record->setAnonymousStructOrUnion(true); 2862 2863 if (Invalid) 2864 Anon->setInvalidDecl(); 2865 2866 return Anon; 2867} 2868 2869/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2870/// Microsoft C anonymous structure. 2871/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2872/// Example: 2873/// 2874/// struct A { int a; }; 2875/// struct B { struct A; int b; }; 2876/// 2877/// void foo() { 2878/// B var; 2879/// var.a = 3; 2880/// } 2881/// 2882Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2883 RecordDecl *Record) { 2884 2885 // If there is no Record, get the record via the typedef. 2886 if (!Record) 2887 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2888 2889 // Mock up a declarator. 2890 Declarator Dc(DS, Declarator::TypeNameContext); 2891 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2892 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2893 2894 // Create a declaration for this anonymous struct. 2895 NamedDecl* Anon = FieldDecl::Create(Context, 2896 cast<RecordDecl>(CurContext), 2897 DS.getSourceRange().getBegin(), 2898 DS.getSourceRange().getBegin(), 2899 /*IdentifierInfo=*/0, 2900 Context.getTypeDeclType(Record), 2901 TInfo, 2902 /*BitWidth=*/0, /*Mutable=*/false, 2903 /*HasInit=*/false); 2904 Anon->setImplicit(); 2905 2906 // Add the anonymous struct object to the current context. 2907 CurContext->addDecl(Anon); 2908 2909 // Inject the members of the anonymous struct into the current 2910 // context and into the identifier resolver chain for name lookup 2911 // purposes. 2912 SmallVector<NamedDecl*, 2> Chain; 2913 Chain.push_back(Anon); 2914 2915 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2916 Record->getDefinition(), 2917 AS_none, Chain, true)) 2918 Anon->setInvalidDecl(); 2919 2920 return Anon; 2921} 2922 2923/// GetNameForDeclarator - Determine the full declaration name for the 2924/// given Declarator. 2925DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2926 return GetNameFromUnqualifiedId(D.getName()); 2927} 2928 2929/// \brief Retrieves the declaration name from a parsed unqualified-id. 2930DeclarationNameInfo 2931Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2932 DeclarationNameInfo NameInfo; 2933 NameInfo.setLoc(Name.StartLocation); 2934 2935 switch (Name.getKind()) { 2936 2937 case UnqualifiedId::IK_ImplicitSelfParam: 2938 case UnqualifiedId::IK_Identifier: 2939 NameInfo.setName(Name.Identifier); 2940 NameInfo.setLoc(Name.StartLocation); 2941 return NameInfo; 2942 2943 case UnqualifiedId::IK_OperatorFunctionId: 2944 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2945 Name.OperatorFunctionId.Operator)); 2946 NameInfo.setLoc(Name.StartLocation); 2947 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2948 = Name.OperatorFunctionId.SymbolLocations[0]; 2949 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2950 = Name.EndLocation.getRawEncoding(); 2951 return NameInfo; 2952 2953 case UnqualifiedId::IK_LiteralOperatorId: 2954 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2955 Name.Identifier)); 2956 NameInfo.setLoc(Name.StartLocation); 2957 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2958 return NameInfo; 2959 2960 case UnqualifiedId::IK_ConversionFunctionId: { 2961 TypeSourceInfo *TInfo; 2962 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2963 if (Ty.isNull()) 2964 return DeclarationNameInfo(); 2965 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2966 Context.getCanonicalType(Ty))); 2967 NameInfo.setLoc(Name.StartLocation); 2968 NameInfo.setNamedTypeInfo(TInfo); 2969 return NameInfo; 2970 } 2971 2972 case UnqualifiedId::IK_ConstructorName: { 2973 TypeSourceInfo *TInfo; 2974 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2975 if (Ty.isNull()) 2976 return DeclarationNameInfo(); 2977 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2978 Context.getCanonicalType(Ty))); 2979 NameInfo.setLoc(Name.StartLocation); 2980 NameInfo.setNamedTypeInfo(TInfo); 2981 return NameInfo; 2982 } 2983 2984 case UnqualifiedId::IK_ConstructorTemplateId: { 2985 // In well-formed code, we can only have a constructor 2986 // template-id that refers to the current context, so go there 2987 // to find the actual type being constructed. 2988 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2989 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2990 return DeclarationNameInfo(); 2991 2992 // Determine the type of the class being constructed. 2993 QualType CurClassType = Context.getTypeDeclType(CurClass); 2994 2995 // FIXME: Check two things: that the template-id names the same type as 2996 // CurClassType, and that the template-id does not occur when the name 2997 // was qualified. 2998 2999 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3000 Context.getCanonicalType(CurClassType))); 3001 NameInfo.setLoc(Name.StartLocation); 3002 // FIXME: should we retrieve TypeSourceInfo? 3003 NameInfo.setNamedTypeInfo(0); 3004 return NameInfo; 3005 } 3006 3007 case UnqualifiedId::IK_DestructorName: { 3008 TypeSourceInfo *TInfo; 3009 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3010 if (Ty.isNull()) 3011 return DeclarationNameInfo(); 3012 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3013 Context.getCanonicalType(Ty))); 3014 NameInfo.setLoc(Name.StartLocation); 3015 NameInfo.setNamedTypeInfo(TInfo); 3016 return NameInfo; 3017 } 3018 3019 case UnqualifiedId::IK_TemplateId: { 3020 TemplateName TName = Name.TemplateId->Template.get(); 3021 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3022 return Context.getNameForTemplate(TName, TNameLoc); 3023 } 3024 3025 } // switch (Name.getKind()) 3026 3027 llvm_unreachable("Unknown name kind"); 3028} 3029 3030static QualType getCoreType(QualType Ty) { 3031 do { 3032 if (Ty->isPointerType() || Ty->isReferenceType()) 3033 Ty = Ty->getPointeeType(); 3034 else if (Ty->isArrayType()) 3035 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3036 else 3037 return Ty.withoutLocalFastQualifiers(); 3038 } while (true); 3039} 3040 3041/// hasSimilarParameters - Determine whether the C++ functions Declaration 3042/// and Definition have "nearly" matching parameters. This heuristic is 3043/// used to improve diagnostics in the case where an out-of-line function 3044/// definition doesn't match any declaration within the class or namespace. 3045/// Also sets Params to the list of indices to the parameters that differ 3046/// between the declaration and the definition. If hasSimilarParameters 3047/// returns true and Params is empty, then all of the parameters match. 3048static bool hasSimilarParameters(ASTContext &Context, 3049 FunctionDecl *Declaration, 3050 FunctionDecl *Definition, 3051 llvm::SmallVectorImpl<unsigned> &Params) { 3052 Params.clear(); 3053 if (Declaration->param_size() != Definition->param_size()) 3054 return false; 3055 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3056 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3057 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3058 3059 // The parameter types are identical 3060 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3061 continue; 3062 3063 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3064 QualType DefParamBaseTy = getCoreType(DefParamTy); 3065 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3066 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3067 3068 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3069 (DeclTyName && DeclTyName == DefTyName)) 3070 Params.push_back(Idx); 3071 else // The two parameters aren't even close 3072 return false; 3073 } 3074 3075 return true; 3076} 3077 3078/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3079/// declarator needs to be rebuilt in the current instantiation. 3080/// Any bits of declarator which appear before the name are valid for 3081/// consideration here. That's specifically the type in the decl spec 3082/// and the base type in any member-pointer chunks. 3083static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3084 DeclarationName Name) { 3085 // The types we specifically need to rebuild are: 3086 // - typenames, typeofs, and decltypes 3087 // - types which will become injected class names 3088 // Of course, we also need to rebuild any type referencing such a 3089 // type. It's safest to just say "dependent", but we call out a 3090 // few cases here. 3091 3092 DeclSpec &DS = D.getMutableDeclSpec(); 3093 switch (DS.getTypeSpecType()) { 3094 case DeclSpec::TST_typename: 3095 case DeclSpec::TST_typeofType: 3096 case DeclSpec::TST_decltype: 3097 case DeclSpec::TST_underlyingType: 3098 case DeclSpec::TST_atomic: { 3099 // Grab the type from the parser. 3100 TypeSourceInfo *TSI = 0; 3101 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3102 if (T.isNull() || !T->isDependentType()) break; 3103 3104 // Make sure there's a type source info. This isn't really much 3105 // of a waste; most dependent types should have type source info 3106 // attached already. 3107 if (!TSI) 3108 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3109 3110 // Rebuild the type in the current instantiation. 3111 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3112 if (!TSI) return true; 3113 3114 // Store the new type back in the decl spec. 3115 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3116 DS.UpdateTypeRep(LocType); 3117 break; 3118 } 3119 3120 case DeclSpec::TST_typeofExpr: { 3121 Expr *E = DS.getRepAsExpr(); 3122 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3123 if (Result.isInvalid()) return true; 3124 DS.UpdateExprRep(Result.get()); 3125 break; 3126 } 3127 3128 default: 3129 // Nothing to do for these decl specs. 3130 break; 3131 } 3132 3133 // It doesn't matter what order we do this in. 3134 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3135 DeclaratorChunk &Chunk = D.getTypeObject(I); 3136 3137 // The only type information in the declarator which can come 3138 // before the declaration name is the base type of a member 3139 // pointer. 3140 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3141 continue; 3142 3143 // Rebuild the scope specifier in-place. 3144 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3145 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3146 return true; 3147 } 3148 3149 return false; 3150} 3151 3152Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3153 D.setFunctionDefinitionKind(FDK_Declaration); 3154 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3155 3156 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3157 Dcl->getDeclContext()->isFileContext()) 3158 Dcl->setTopLevelDeclInObjCContainer(); 3159 3160 return Dcl; 3161} 3162 3163/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3164/// If T is the name of a class, then each of the following shall have a 3165/// name different from T: 3166/// - every static data member of class T; 3167/// - every member function of class T 3168/// - every member of class T that is itself a type; 3169/// \returns true if the declaration name violates these rules. 3170bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3171 DeclarationNameInfo NameInfo) { 3172 DeclarationName Name = NameInfo.getName(); 3173 3174 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3175 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3176 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3177 return true; 3178 } 3179 3180 return false; 3181} 3182 3183Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3184 MultiTemplateParamsArg TemplateParamLists) { 3185 // TODO: consider using NameInfo for diagnostic. 3186 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3187 DeclarationName Name = NameInfo.getName(); 3188 3189 // All of these full declarators require an identifier. If it doesn't have 3190 // one, the ParsedFreeStandingDeclSpec action should be used. 3191 if (!Name) { 3192 if (!D.isInvalidType()) // Reject this if we think it is valid. 3193 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3194 diag::err_declarator_need_ident) 3195 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3196 return 0; 3197 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3198 return 0; 3199 3200 // The scope passed in may not be a decl scope. Zip up the scope tree until 3201 // we find one that is. 3202 while ((S->getFlags() & Scope::DeclScope) == 0 || 3203 (S->getFlags() & Scope::TemplateParamScope) != 0) 3204 S = S->getParent(); 3205 3206 DeclContext *DC = CurContext; 3207 if (D.getCXXScopeSpec().isInvalid()) 3208 D.setInvalidType(); 3209 else if (D.getCXXScopeSpec().isSet()) { 3210 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3211 UPPC_DeclarationQualifier)) 3212 return 0; 3213 3214 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3215 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3216 if (!DC) { 3217 // If we could not compute the declaration context, it's because the 3218 // declaration context is dependent but does not refer to a class, 3219 // class template, or class template partial specialization. Complain 3220 // and return early, to avoid the coming semantic disaster. 3221 Diag(D.getIdentifierLoc(), 3222 diag::err_template_qualified_declarator_no_match) 3223 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3224 << D.getCXXScopeSpec().getRange(); 3225 return 0; 3226 } 3227 bool IsDependentContext = DC->isDependentContext(); 3228 3229 if (!IsDependentContext && 3230 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3231 return 0; 3232 3233 if (isa<CXXRecordDecl>(DC)) { 3234 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3235 Diag(D.getIdentifierLoc(), 3236 diag::err_member_def_undefined_record) 3237 << Name << DC << D.getCXXScopeSpec().getRange(); 3238 D.setInvalidType(); 3239 } else if (isa<CXXRecordDecl>(CurContext) && 3240 !D.getDeclSpec().isFriendSpecified()) { 3241 // The user provided a superfluous scope specifier inside a class 3242 // definition: 3243 // 3244 // class X { 3245 // void X::f(); 3246 // }; 3247 if (CurContext->Equals(DC)) { 3248 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3249 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3250 } else { 3251 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3252 << Name << D.getCXXScopeSpec().getRange(); 3253 3254 // C++ constructors and destructors with incorrect scopes can break 3255 // our AST invariants by having the wrong underlying types. If 3256 // that's the case, then drop this declaration entirely. 3257 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3258 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3259 !Context.hasSameType(Name.getCXXNameType(), 3260 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3261 return 0; 3262 } 3263 3264 // Pretend that this qualifier was not here. 3265 D.getCXXScopeSpec().clear(); 3266 } 3267 } 3268 3269 // Check whether we need to rebuild the type of the given 3270 // declaration in the current instantiation. 3271 if (EnteringContext && IsDependentContext && 3272 TemplateParamLists.size() != 0) { 3273 ContextRAII SavedContext(*this, DC); 3274 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3275 D.setInvalidType(); 3276 } 3277 } 3278 3279 if (DiagnoseClassNameShadow(DC, NameInfo)) 3280 // If this is a typedef, we'll end up spewing multiple diagnostics. 3281 // Just return early; it's safer. 3282 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3283 return 0; 3284 3285 NamedDecl *New; 3286 3287 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3288 QualType R = TInfo->getType(); 3289 3290 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3291 UPPC_DeclarationType)) 3292 D.setInvalidType(); 3293 3294 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3295 ForRedeclaration); 3296 3297 // See if this is a redefinition of a variable in the same scope. 3298 if (!D.getCXXScopeSpec().isSet()) { 3299 bool IsLinkageLookup = false; 3300 3301 // If the declaration we're planning to build will be a function 3302 // or object with linkage, then look for another declaration with 3303 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3304 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3305 /* Do nothing*/; 3306 else if (R->isFunctionType()) { 3307 if (CurContext->isFunctionOrMethod() || 3308 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3309 IsLinkageLookup = true; 3310 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3311 IsLinkageLookup = true; 3312 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3313 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3314 IsLinkageLookup = true; 3315 3316 if (IsLinkageLookup) 3317 Previous.clear(LookupRedeclarationWithLinkage); 3318 3319 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3320 } else { // Something like "int foo::x;" 3321 LookupQualifiedName(Previous, DC); 3322 3323 // Don't consider using declarations as previous declarations for 3324 // out-of-line members. 3325 RemoveUsingDecls(Previous); 3326 3327 // C++ 7.3.1.2p2: 3328 // Members (including explicit specializations of templates) of a named 3329 // namespace can also be defined outside that namespace by explicit 3330 // qualification of the name being defined, provided that the entity being 3331 // defined was already declared in the namespace and the definition appears 3332 // after the point of declaration in a namespace that encloses the 3333 // declarations namespace. 3334 // 3335 // Note that we only check the context at this point. We don't yet 3336 // have enough information to make sure that PrevDecl is actually 3337 // the declaration we want to match. For example, given: 3338 // 3339 // class X { 3340 // void f(); 3341 // void f(float); 3342 // }; 3343 // 3344 // void X::f(int) { } // ill-formed 3345 // 3346 // In this case, PrevDecl will point to the overload set 3347 // containing the two f's declared in X, but neither of them 3348 // matches. 3349 3350 // First check whether we named the global scope. 3351 if (isa<TranslationUnitDecl>(DC)) { 3352 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3353 << Name << D.getCXXScopeSpec().getRange(); 3354 } else { 3355 DeclContext *Cur = CurContext; 3356 while (isa<LinkageSpecDecl>(Cur)) 3357 Cur = Cur->getParent(); 3358 if (!Cur->Encloses(DC)) { 3359 // The qualifying scope doesn't enclose the original declaration. 3360 // Emit diagnostic based on current scope. 3361 SourceLocation L = D.getIdentifierLoc(); 3362 SourceRange R = D.getCXXScopeSpec().getRange(); 3363 if (isa<FunctionDecl>(Cur)) 3364 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3365 else 3366 Diag(L, diag::err_invalid_declarator_scope) 3367 << Name << cast<NamedDecl>(DC) << R; 3368 D.setInvalidType(); 3369 } 3370 3371 // C++11 8.3p1: 3372 // ... "The nested-name-specifier of the qualified declarator-id shall 3373 // not begin with a decltype-specifer" 3374 NestedNameSpecifierLoc SpecLoc = 3375 D.getCXXScopeSpec().getWithLocInContext(Context); 3376 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3377 "NestedNameSpecifierLoc"); 3378 while (SpecLoc.getPrefix()) 3379 SpecLoc = SpecLoc.getPrefix(); 3380 if (dyn_cast_or_null<DecltypeType>( 3381 SpecLoc.getNestedNameSpecifier()->getAsType())) 3382 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3383 << SpecLoc.getTypeLoc().getSourceRange(); 3384 } 3385 } 3386 3387 if (Previous.isSingleResult() && 3388 Previous.getFoundDecl()->isTemplateParameter()) { 3389 // Maybe we will complain about the shadowed template parameter. 3390 if (!D.isInvalidType()) 3391 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3392 Previous.getFoundDecl()); 3393 3394 // Just pretend that we didn't see the previous declaration. 3395 Previous.clear(); 3396 } 3397 3398 // In C++, the previous declaration we find might be a tag type 3399 // (class or enum). In this case, the new declaration will hide the 3400 // tag type. Note that this does does not apply if we're declaring a 3401 // typedef (C++ [dcl.typedef]p4). 3402 if (Previous.isSingleTagDecl() && 3403 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3404 Previous.clear(); 3405 3406 bool AddToScope = true; 3407 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3408 if (TemplateParamLists.size()) { 3409 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3410 return 0; 3411 } 3412 3413 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3414 } else if (R->isFunctionType()) { 3415 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3416 move(TemplateParamLists), 3417 AddToScope); 3418 } else { 3419 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3420 move(TemplateParamLists)); 3421 } 3422 3423 if (New == 0) 3424 return 0; 3425 3426 // If this has an identifier and is not an invalid redeclaration or 3427 // function template specialization, add it to the scope stack. 3428 if (New->getDeclName() && AddToScope && 3429 !(D.isRedeclaration() && New->isInvalidDecl())) 3430 PushOnScopeChains(New, S); 3431 3432 return New; 3433} 3434 3435/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3436/// types into constant array types in certain situations which would otherwise 3437/// be errors (for GCC compatibility). 3438static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3439 ASTContext &Context, 3440 bool &SizeIsNegative, 3441 llvm::APSInt &Oversized) { 3442 // This method tries to turn a variable array into a constant 3443 // array even when the size isn't an ICE. This is necessary 3444 // for compatibility with code that depends on gcc's buggy 3445 // constant expression folding, like struct {char x[(int)(char*)2];} 3446 SizeIsNegative = false; 3447 Oversized = 0; 3448 3449 if (T->isDependentType()) 3450 return QualType(); 3451 3452 QualifierCollector Qs; 3453 const Type *Ty = Qs.strip(T); 3454 3455 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3456 QualType Pointee = PTy->getPointeeType(); 3457 QualType FixedType = 3458 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3459 Oversized); 3460 if (FixedType.isNull()) return FixedType; 3461 FixedType = Context.getPointerType(FixedType); 3462 return Qs.apply(Context, FixedType); 3463 } 3464 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3465 QualType Inner = PTy->getInnerType(); 3466 QualType FixedType = 3467 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3468 Oversized); 3469 if (FixedType.isNull()) return FixedType; 3470 FixedType = Context.getParenType(FixedType); 3471 return Qs.apply(Context, FixedType); 3472 } 3473 3474 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3475 if (!VLATy) 3476 return QualType(); 3477 // FIXME: We should probably handle this case 3478 if (VLATy->getElementType()->isVariablyModifiedType()) 3479 return QualType(); 3480 3481 llvm::APSInt Res; 3482 if (!VLATy->getSizeExpr() || 3483 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3484 return QualType(); 3485 3486 // Check whether the array size is negative. 3487 if (Res.isSigned() && Res.isNegative()) { 3488 SizeIsNegative = true; 3489 return QualType(); 3490 } 3491 3492 // Check whether the array is too large to be addressed. 3493 unsigned ActiveSizeBits 3494 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3495 Res); 3496 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3497 Oversized = Res; 3498 return QualType(); 3499 } 3500 3501 return Context.getConstantArrayType(VLATy->getElementType(), 3502 Res, ArrayType::Normal, 0); 3503} 3504 3505/// \brief Register the given locally-scoped external C declaration so 3506/// that it can be found later for redeclarations 3507void 3508Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3509 const LookupResult &Previous, 3510 Scope *S) { 3511 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3512 "Decl is not a locally-scoped decl!"); 3513 // Note that we have a locally-scoped external with this name. 3514 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3515 3516 if (!Previous.isSingleResult()) 3517 return; 3518 3519 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3520 3521 // If there was a previous declaration of this variable, it may be 3522 // in our identifier chain. Update the identifier chain with the new 3523 // declaration. 3524 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3525 // The previous declaration was found on the identifer resolver 3526 // chain, so remove it from its scope. 3527 3528 if (S->isDeclScope(PrevDecl)) { 3529 // Special case for redeclarations in the SAME scope. 3530 // Because this declaration is going to be added to the identifier chain 3531 // later, we should temporarily take it OFF the chain. 3532 IdResolver.RemoveDecl(ND); 3533 3534 } else { 3535 // Find the scope for the original declaration. 3536 while (S && !S->isDeclScope(PrevDecl)) 3537 S = S->getParent(); 3538 } 3539 3540 if (S) 3541 S->RemoveDecl(PrevDecl); 3542 } 3543} 3544 3545llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3546Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3547 if (ExternalSource) { 3548 // Load locally-scoped external decls from the external source. 3549 SmallVector<NamedDecl *, 4> Decls; 3550 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3551 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3552 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3553 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3554 if (Pos == LocallyScopedExternalDecls.end()) 3555 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3556 } 3557 } 3558 3559 return LocallyScopedExternalDecls.find(Name); 3560} 3561 3562/// \brief Diagnose function specifiers on a declaration of an identifier that 3563/// does not identify a function. 3564void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3565 // FIXME: We should probably indicate the identifier in question to avoid 3566 // confusion for constructs like "inline int a(), b;" 3567 if (D.getDeclSpec().isInlineSpecified()) 3568 Diag(D.getDeclSpec().getInlineSpecLoc(), 3569 diag::err_inline_non_function); 3570 3571 if (D.getDeclSpec().isVirtualSpecified()) 3572 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3573 diag::err_virtual_non_function); 3574 3575 if (D.getDeclSpec().isExplicitSpecified()) 3576 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3577 diag::err_explicit_non_function); 3578} 3579 3580NamedDecl* 3581Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3582 TypeSourceInfo *TInfo, LookupResult &Previous) { 3583 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3584 if (D.getCXXScopeSpec().isSet()) { 3585 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3586 << D.getCXXScopeSpec().getRange(); 3587 D.setInvalidType(); 3588 // Pretend we didn't see the scope specifier. 3589 DC = CurContext; 3590 Previous.clear(); 3591 } 3592 3593 if (getLangOptions().CPlusPlus) { 3594 // Check that there are no default arguments (C++ only). 3595 CheckExtraCXXDefaultArguments(D); 3596 } 3597 3598 DiagnoseFunctionSpecifiers(D); 3599 3600 if (D.getDeclSpec().isThreadSpecified()) 3601 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3602 if (D.getDeclSpec().isConstexprSpecified()) 3603 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3604 << 1; 3605 3606 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3607 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3608 << D.getName().getSourceRange(); 3609 return 0; 3610 } 3611 3612 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3613 if (!NewTD) return 0; 3614 3615 // Handle attributes prior to checking for duplicates in MergeVarDecl 3616 ProcessDeclAttributes(S, NewTD, D); 3617 3618 CheckTypedefForVariablyModifiedType(S, NewTD); 3619 3620 bool Redeclaration = D.isRedeclaration(); 3621 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3622 D.setRedeclaration(Redeclaration); 3623 return ND; 3624} 3625 3626void 3627Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3628 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3629 // then it shall have block scope. 3630 // Note that variably modified types must be fixed before merging the decl so 3631 // that redeclarations will match. 3632 QualType T = NewTD->getUnderlyingType(); 3633 if (T->isVariablyModifiedType()) { 3634 getCurFunction()->setHasBranchProtectedScope(); 3635 3636 if (S->getFnParent() == 0) { 3637 bool SizeIsNegative; 3638 llvm::APSInt Oversized; 3639 QualType FixedTy = 3640 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3641 Oversized); 3642 if (!FixedTy.isNull()) { 3643 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3644 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3645 } else { 3646 if (SizeIsNegative) 3647 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3648 else if (T->isVariableArrayType()) 3649 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3650 else if (Oversized.getBoolValue()) 3651 Diag(NewTD->getLocation(), diag::err_array_too_large) 3652 << Oversized.toString(10); 3653 else 3654 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3655 NewTD->setInvalidDecl(); 3656 } 3657 } 3658 } 3659} 3660 3661 3662/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3663/// declares a typedef-name, either using the 'typedef' type specifier or via 3664/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3665NamedDecl* 3666Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3667 LookupResult &Previous, bool &Redeclaration) { 3668 // Merge the decl with the existing one if appropriate. If the decl is 3669 // in an outer scope, it isn't the same thing. 3670 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3671 /*ExplicitInstantiationOrSpecialization=*/false); 3672 if (!Previous.empty()) { 3673 Redeclaration = true; 3674 MergeTypedefNameDecl(NewTD, Previous); 3675 } 3676 3677 // If this is the C FILE type, notify the AST context. 3678 if (IdentifierInfo *II = NewTD->getIdentifier()) 3679 if (!NewTD->isInvalidDecl() && 3680 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3681 if (II->isStr("FILE")) 3682 Context.setFILEDecl(NewTD); 3683 else if (II->isStr("jmp_buf")) 3684 Context.setjmp_bufDecl(NewTD); 3685 else if (II->isStr("sigjmp_buf")) 3686 Context.setsigjmp_bufDecl(NewTD); 3687 else if (II->isStr("ucontext_t")) 3688 Context.setucontext_tDecl(NewTD); 3689 else if (II->isStr("__builtin_va_list")) 3690 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3691 } 3692 3693 return NewTD; 3694} 3695 3696/// \brief Determines whether the given declaration is an out-of-scope 3697/// previous declaration. 3698/// 3699/// This routine should be invoked when name lookup has found a 3700/// previous declaration (PrevDecl) that is not in the scope where a 3701/// new declaration by the same name is being introduced. If the new 3702/// declaration occurs in a local scope, previous declarations with 3703/// linkage may still be considered previous declarations (C99 3704/// 6.2.2p4-5, C++ [basic.link]p6). 3705/// 3706/// \param PrevDecl the previous declaration found by name 3707/// lookup 3708/// 3709/// \param DC the context in which the new declaration is being 3710/// declared. 3711/// 3712/// \returns true if PrevDecl is an out-of-scope previous declaration 3713/// for a new delcaration with the same name. 3714static bool 3715isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3716 ASTContext &Context) { 3717 if (!PrevDecl) 3718 return false; 3719 3720 if (!PrevDecl->hasLinkage()) 3721 return false; 3722 3723 if (Context.getLangOptions().CPlusPlus) { 3724 // C++ [basic.link]p6: 3725 // If there is a visible declaration of an entity with linkage 3726 // having the same name and type, ignoring entities declared 3727 // outside the innermost enclosing namespace scope, the block 3728 // scope declaration declares that same entity and receives the 3729 // linkage of the previous declaration. 3730 DeclContext *OuterContext = DC->getRedeclContext(); 3731 if (!OuterContext->isFunctionOrMethod()) 3732 // This rule only applies to block-scope declarations. 3733 return false; 3734 3735 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3736 if (PrevOuterContext->isRecord()) 3737 // We found a member function: ignore it. 3738 return false; 3739 3740 // Find the innermost enclosing namespace for the new and 3741 // previous declarations. 3742 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3743 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3744 3745 // The previous declaration is in a different namespace, so it 3746 // isn't the same function. 3747 if (!OuterContext->Equals(PrevOuterContext)) 3748 return false; 3749 } 3750 3751 return true; 3752} 3753 3754static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3755 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3756 if (!SS.isSet()) return; 3757 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3758} 3759 3760bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3761 QualType type = decl->getType(); 3762 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3763 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3764 // Various kinds of declaration aren't allowed to be __autoreleasing. 3765 unsigned kind = -1U; 3766 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3767 if (var->hasAttr<BlocksAttr>()) 3768 kind = 0; // __block 3769 else if (!var->hasLocalStorage()) 3770 kind = 1; // global 3771 } else if (isa<ObjCIvarDecl>(decl)) { 3772 kind = 3; // ivar 3773 } else if (isa<FieldDecl>(decl)) { 3774 kind = 2; // field 3775 } 3776 3777 if (kind != -1U) { 3778 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3779 << kind; 3780 } 3781 } else if (lifetime == Qualifiers::OCL_None) { 3782 // Try to infer lifetime. 3783 if (!type->isObjCLifetimeType()) 3784 return false; 3785 3786 lifetime = type->getObjCARCImplicitLifetime(); 3787 type = Context.getLifetimeQualifiedType(type, lifetime); 3788 decl->setType(type); 3789 } 3790 3791 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3792 // Thread-local variables cannot have lifetime. 3793 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3794 var->isThreadSpecified()) { 3795 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3796 << var->getType(); 3797 return true; 3798 } 3799 } 3800 3801 return false; 3802} 3803 3804NamedDecl* 3805Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3806 TypeSourceInfo *TInfo, LookupResult &Previous, 3807 MultiTemplateParamsArg TemplateParamLists) { 3808 QualType R = TInfo->getType(); 3809 DeclarationName Name = GetNameForDeclarator(D).getName(); 3810 3811 // Check that there are no default arguments (C++ only). 3812 if (getLangOptions().CPlusPlus) 3813 CheckExtraCXXDefaultArguments(D); 3814 3815 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3816 assert(SCSpec != DeclSpec::SCS_typedef && 3817 "Parser allowed 'typedef' as storage class VarDecl."); 3818 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3819 if (SCSpec == DeclSpec::SCS_mutable) { 3820 // mutable can only appear on non-static class members, so it's always 3821 // an error here 3822 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3823 D.setInvalidType(); 3824 SC = SC_None; 3825 } 3826 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3827 VarDecl::StorageClass SCAsWritten 3828 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3829 3830 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3831 if (!II) { 3832 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3833 << Name; 3834 return 0; 3835 } 3836 3837 DiagnoseFunctionSpecifiers(D); 3838 3839 if (!DC->isRecord() && S->getFnParent() == 0) { 3840 // C99 6.9p2: The storage-class specifiers auto and register shall not 3841 // appear in the declaration specifiers in an external declaration. 3842 if (SC == SC_Auto || SC == SC_Register) { 3843 3844 // If this is a register variable with an asm label specified, then this 3845 // is a GNU extension. 3846 if (SC == SC_Register && D.getAsmLabel()) 3847 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3848 else 3849 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3850 D.setInvalidType(); 3851 } 3852 } 3853 3854 if (getLangOptions().OpenCL) { 3855 // Set up the special work-group-local storage class for variables in the 3856 // OpenCL __local address space. 3857 if (R.getAddressSpace() == LangAS::opencl_local) 3858 SC = SC_OpenCLWorkGroupLocal; 3859 } 3860 3861 bool isExplicitSpecialization = false; 3862 VarDecl *NewVD; 3863 if (!getLangOptions().CPlusPlus) { 3864 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3865 D.getIdentifierLoc(), II, 3866 R, TInfo, SC, SCAsWritten); 3867 3868 if (D.isInvalidType()) 3869 NewVD->setInvalidDecl(); 3870 } else { 3871 if (DC->isRecord() && !CurContext->isRecord()) { 3872 // This is an out-of-line definition of a static data member. 3873 if (SC == SC_Static) { 3874 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3875 diag::err_static_out_of_line) 3876 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3877 } else if (SC == SC_None) 3878 SC = SC_Static; 3879 } 3880 if (SC == SC_Static) { 3881 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3882 if (RD->isLocalClass()) 3883 Diag(D.getIdentifierLoc(), 3884 diag::err_static_data_member_not_allowed_in_local_class) 3885 << Name << RD->getDeclName(); 3886 3887 // C++ [class.union]p1: If a union contains a static data member, 3888 // the program is ill-formed. 3889 // 3890 // We also disallow static data members in anonymous structs. 3891 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3892 Diag(D.getIdentifierLoc(), 3893 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3894 << Name << RD->isUnion(); 3895 } 3896 } 3897 3898 // Match up the template parameter lists with the scope specifier, then 3899 // determine whether we have a template or a template specialization. 3900 isExplicitSpecialization = false; 3901 bool Invalid = false; 3902 if (TemplateParameterList *TemplateParams 3903 = MatchTemplateParametersToScopeSpecifier( 3904 D.getDeclSpec().getSourceRange().getBegin(), 3905 D.getIdentifierLoc(), 3906 D.getCXXScopeSpec(), 3907 TemplateParamLists.get(), 3908 TemplateParamLists.size(), 3909 /*never a friend*/ false, 3910 isExplicitSpecialization, 3911 Invalid)) { 3912 if (TemplateParams->size() > 0) { 3913 // There is no such thing as a variable template. 3914 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3915 << II 3916 << SourceRange(TemplateParams->getTemplateLoc(), 3917 TemplateParams->getRAngleLoc()); 3918 return 0; 3919 } else { 3920 // There is an extraneous 'template<>' for this variable. Complain 3921 // about it, but allow the declaration of the variable. 3922 Diag(TemplateParams->getTemplateLoc(), 3923 diag::err_template_variable_noparams) 3924 << II 3925 << SourceRange(TemplateParams->getTemplateLoc(), 3926 TemplateParams->getRAngleLoc()); 3927 } 3928 } 3929 3930 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3931 D.getIdentifierLoc(), II, 3932 R, TInfo, SC, SCAsWritten); 3933 3934 // If this decl has an auto type in need of deduction, make a note of the 3935 // Decl so we can diagnose uses of it in its own initializer. 3936 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3937 R->getContainedAutoType()) 3938 ParsingInitForAutoVars.insert(NewVD); 3939 3940 if (D.isInvalidType() || Invalid) 3941 NewVD->setInvalidDecl(); 3942 3943 SetNestedNameSpecifier(NewVD, D); 3944 3945 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3946 NewVD->setTemplateParameterListsInfo(Context, 3947 TemplateParamLists.size(), 3948 TemplateParamLists.release()); 3949 } 3950 3951 if (D.getDeclSpec().isConstexprSpecified()) { 3952 // FIXME: once we know whether there's an initializer, apply this to 3953 // static data members too. 3954 if (!NewVD->isStaticDataMember() && 3955 !NewVD->isThisDeclarationADefinition()) { 3956 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3957 // of a variable. Suggest replacing it with 'const' if appropriate. 3958 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3959 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3960 // If the declarator is complex, we need to move the keyword to the 3961 // innermost chunk as we switch it from 'constexpr' to 'const'. 3962 int Kind = DeclaratorChunk::Paren; 3963 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3964 Kind = D.getTypeObject(I).Kind; 3965 if (Kind != DeclaratorChunk::Paren) 3966 break; 3967 } 3968 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3969 Kind == DeclaratorChunk::Reference) 3970 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3971 << FixItHint::CreateRemoval(ConstexprRange); 3972 else if (Kind == DeclaratorChunk::Paren) 3973 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3974 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3975 else 3976 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3977 << FixItHint::CreateRemoval(ConstexprRange) 3978 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3979 } else { 3980 NewVD->setConstexpr(true); 3981 } 3982 } 3983 } 3984 3985 // Set the lexical context. If the declarator has a C++ scope specifier, the 3986 // lexical context will be different from the semantic context. 3987 NewVD->setLexicalDeclContext(CurContext); 3988 3989 if (D.getDeclSpec().isThreadSpecified()) { 3990 if (NewVD->hasLocalStorage()) 3991 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3992 else if (!Context.getTargetInfo().isTLSSupported()) 3993 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3994 else 3995 NewVD->setThreadSpecified(true); 3996 } 3997 3998 if (D.getDeclSpec().isModulePrivateSpecified()) { 3999 if (isExplicitSpecialization) 4000 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4001 << 2 4002 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4003 else if (NewVD->hasLocalStorage()) 4004 Diag(NewVD->getLocation(), diag::err_module_private_local) 4005 << 0 << NewVD->getDeclName() 4006 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4007 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4008 else 4009 NewVD->setModulePrivate(); 4010 } 4011 4012 // Handle attributes prior to checking for duplicates in MergeVarDecl 4013 ProcessDeclAttributes(S, NewVD, D); 4014 4015 // In auto-retain/release, infer strong retension for variables of 4016 // retainable type. 4017 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4018 NewVD->setInvalidDecl(); 4019 4020 // Handle GNU asm-label extension (encoded as an attribute). 4021 if (Expr *E = (Expr*)D.getAsmLabel()) { 4022 // The parser guarantees this is a string. 4023 StringLiteral *SE = cast<StringLiteral>(E); 4024 StringRef Label = SE->getString(); 4025 if (S->getFnParent() != 0) { 4026 switch (SC) { 4027 case SC_None: 4028 case SC_Auto: 4029 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4030 break; 4031 case SC_Register: 4032 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4033 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4034 break; 4035 case SC_Static: 4036 case SC_Extern: 4037 case SC_PrivateExtern: 4038 case SC_OpenCLWorkGroupLocal: 4039 break; 4040 } 4041 } 4042 4043 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4044 Context, Label)); 4045 } 4046 4047 // Diagnose shadowed variables before filtering for scope. 4048 if (!D.getCXXScopeSpec().isSet()) 4049 CheckShadow(S, NewVD, Previous); 4050 4051 // Don't consider existing declarations that are in a different 4052 // scope and are out-of-semantic-context declarations (if the new 4053 // declaration has linkage). 4054 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4055 isExplicitSpecialization); 4056 4057 if (!getLangOptions().CPlusPlus) { 4058 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4059 } else { 4060 // Merge the decl with the existing one if appropriate. 4061 if (!Previous.empty()) { 4062 if (Previous.isSingleResult() && 4063 isa<FieldDecl>(Previous.getFoundDecl()) && 4064 D.getCXXScopeSpec().isSet()) { 4065 // The user tried to define a non-static data member 4066 // out-of-line (C++ [dcl.meaning]p1). 4067 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4068 << D.getCXXScopeSpec().getRange(); 4069 Previous.clear(); 4070 NewVD->setInvalidDecl(); 4071 } 4072 } else if (D.getCXXScopeSpec().isSet()) { 4073 // No previous declaration in the qualifying scope. 4074 Diag(D.getIdentifierLoc(), diag::err_no_member) 4075 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4076 << D.getCXXScopeSpec().getRange(); 4077 NewVD->setInvalidDecl(); 4078 } 4079 4080 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4081 4082 // This is an explicit specialization of a static data member. Check it. 4083 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4084 CheckMemberSpecialization(NewVD, Previous)) 4085 NewVD->setInvalidDecl(); 4086 } 4087 4088 // attributes declared post-definition are currently ignored 4089 // FIXME: This should be handled in attribute merging, not 4090 // here. 4091 if (Previous.isSingleResult()) { 4092 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4093 if (Def && (Def = Def->getDefinition()) && 4094 Def != NewVD && D.hasAttributes()) { 4095 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4096 Diag(Def->getLocation(), diag::note_previous_definition); 4097 } 4098 } 4099 4100 // If this is a locally-scoped extern C variable, update the map of 4101 // such variables. 4102 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4103 !NewVD->isInvalidDecl()) 4104 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4105 4106 // If there's a #pragma GCC visibility in scope, and this isn't a class 4107 // member, set the visibility of this variable. 4108 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4109 AddPushedVisibilityAttribute(NewVD); 4110 4111 MarkUnusedFileScopedDecl(NewVD); 4112 4113 return NewVD; 4114} 4115 4116/// \brief Diagnose variable or built-in function shadowing. Implements 4117/// -Wshadow. 4118/// 4119/// This method is called whenever a VarDecl is added to a "useful" 4120/// scope. 4121/// 4122/// \param S the scope in which the shadowing name is being declared 4123/// \param R the lookup of the name 4124/// 4125void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4126 // Return if warning is ignored. 4127 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4128 DiagnosticsEngine::Ignored) 4129 return; 4130 4131 // Don't diagnose declarations at file scope. 4132 if (D->hasGlobalStorage()) 4133 return; 4134 4135 DeclContext *NewDC = D->getDeclContext(); 4136 4137 // Only diagnose if we're shadowing an unambiguous field or variable. 4138 if (R.getResultKind() != LookupResult::Found) 4139 return; 4140 4141 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4142 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4143 return; 4144 4145 // Fields are not shadowed by variables in C++ static methods. 4146 if (isa<FieldDecl>(ShadowedDecl)) 4147 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4148 if (MD->isStatic()) 4149 return; 4150 4151 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4152 if (shadowedVar->isExternC()) { 4153 // For shadowing external vars, make sure that we point to the global 4154 // declaration, not a locally scoped extern declaration. 4155 for (VarDecl::redecl_iterator 4156 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4157 I != E; ++I) 4158 if (I->isFileVarDecl()) { 4159 ShadowedDecl = *I; 4160 break; 4161 } 4162 } 4163 4164 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4165 4166 // Only warn about certain kinds of shadowing for class members. 4167 if (NewDC && NewDC->isRecord()) { 4168 // In particular, don't warn about shadowing non-class members. 4169 if (!OldDC->isRecord()) 4170 return; 4171 4172 // TODO: should we warn about static data members shadowing 4173 // static data members from base classes? 4174 4175 // TODO: don't diagnose for inaccessible shadowed members. 4176 // This is hard to do perfectly because we might friend the 4177 // shadowing context, but that's just a false negative. 4178 } 4179 4180 // Determine what kind of declaration we're shadowing. 4181 unsigned Kind; 4182 if (isa<RecordDecl>(OldDC)) { 4183 if (isa<FieldDecl>(ShadowedDecl)) 4184 Kind = 3; // field 4185 else 4186 Kind = 2; // static data member 4187 } else if (OldDC->isFileContext()) 4188 Kind = 1; // global 4189 else 4190 Kind = 0; // local 4191 4192 DeclarationName Name = R.getLookupName(); 4193 4194 // Emit warning and note. 4195 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4196 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4197} 4198 4199/// \brief Check -Wshadow without the advantage of a previous lookup. 4200void Sema::CheckShadow(Scope *S, VarDecl *D) { 4201 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4202 DiagnosticsEngine::Ignored) 4203 return; 4204 4205 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4206 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4207 LookupName(R, S); 4208 CheckShadow(S, D, R); 4209} 4210 4211/// \brief Perform semantic checking on a newly-created variable 4212/// declaration. 4213/// 4214/// This routine performs all of the type-checking required for a 4215/// variable declaration once it has been built. It is used both to 4216/// check variables after they have been parsed and their declarators 4217/// have been translated into a declaration, and to check variables 4218/// that have been instantiated from a template. 4219/// 4220/// Sets NewVD->isInvalidDecl() if an error was encountered. 4221/// 4222/// Returns true if the variable declaration is a redeclaration. 4223bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4224 LookupResult &Previous) { 4225 // If the decl is already known invalid, don't check it. 4226 if (NewVD->isInvalidDecl()) 4227 return false; 4228 4229 QualType T = NewVD->getType(); 4230 4231 if (T->isObjCObjectType()) { 4232 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4233 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4234 T = Context.getObjCObjectPointerType(T); 4235 NewVD->setType(T); 4236 } 4237 4238 // Emit an error if an address space was applied to decl with local storage. 4239 // This includes arrays of objects with address space qualifiers, but not 4240 // automatic variables that point to other address spaces. 4241 // ISO/IEC TR 18037 S5.1.2 4242 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4243 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4244 NewVD->setInvalidDecl(); 4245 return false; 4246 } 4247 4248 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4249 && !NewVD->hasAttr<BlocksAttr>()) { 4250 if (getLangOptions().getGC() != LangOptions::NonGC) 4251 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4252 else 4253 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4254 } 4255 4256 bool isVM = T->isVariablyModifiedType(); 4257 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4258 NewVD->hasAttr<BlocksAttr>()) 4259 getCurFunction()->setHasBranchProtectedScope(); 4260 4261 if ((isVM && NewVD->hasLinkage()) || 4262 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4263 bool SizeIsNegative; 4264 llvm::APSInt Oversized; 4265 QualType FixedTy = 4266 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4267 Oversized); 4268 4269 if (FixedTy.isNull() && T->isVariableArrayType()) { 4270 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4271 // FIXME: This won't give the correct result for 4272 // int a[10][n]; 4273 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4274 4275 if (NewVD->isFileVarDecl()) 4276 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4277 << SizeRange; 4278 else if (NewVD->getStorageClass() == SC_Static) 4279 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4280 << SizeRange; 4281 else 4282 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4283 << SizeRange; 4284 NewVD->setInvalidDecl(); 4285 return false; 4286 } 4287 4288 if (FixedTy.isNull()) { 4289 if (NewVD->isFileVarDecl()) 4290 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4291 else 4292 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4293 NewVD->setInvalidDecl(); 4294 return false; 4295 } 4296 4297 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4298 NewVD->setType(FixedTy); 4299 } 4300 4301 if (Previous.empty() && NewVD->isExternC()) { 4302 // Since we did not find anything by this name and we're declaring 4303 // an extern "C" variable, look for a non-visible extern "C" 4304 // declaration with the same name. 4305 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4306 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4307 if (Pos != LocallyScopedExternalDecls.end()) 4308 Previous.addDecl(Pos->second); 4309 } 4310 4311 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4312 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4313 << T; 4314 NewVD->setInvalidDecl(); 4315 return false; 4316 } 4317 4318 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4319 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4320 NewVD->setInvalidDecl(); 4321 return false; 4322 } 4323 4324 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4325 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4326 NewVD->setInvalidDecl(); 4327 return false; 4328 } 4329 4330 // Function pointers and references cannot have qualified function type, only 4331 // function pointer-to-members can do that. 4332 QualType Pointee; 4333 unsigned PtrOrRef = 0; 4334 if (const PointerType *Ptr = T->getAs<PointerType>()) 4335 Pointee = Ptr->getPointeeType(); 4336 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4337 Pointee = Ref->getPointeeType(); 4338 PtrOrRef = 1; 4339 } 4340 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4341 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4342 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4343 << PtrOrRef; 4344 NewVD->setInvalidDecl(); 4345 return false; 4346 } 4347 4348 if (!Previous.empty()) { 4349 MergeVarDecl(NewVD, Previous); 4350 return true; 4351 } 4352 return false; 4353} 4354 4355/// \brief Data used with FindOverriddenMethod 4356struct FindOverriddenMethodData { 4357 Sema *S; 4358 CXXMethodDecl *Method; 4359}; 4360 4361/// \brief Member lookup function that determines whether a given C++ 4362/// method overrides a method in a base class, to be used with 4363/// CXXRecordDecl::lookupInBases(). 4364static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4365 CXXBasePath &Path, 4366 void *UserData) { 4367 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4368 4369 FindOverriddenMethodData *Data 4370 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4371 4372 DeclarationName Name = Data->Method->getDeclName(); 4373 4374 // FIXME: Do we care about other names here too? 4375 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4376 // We really want to find the base class destructor here. 4377 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4378 CanQualType CT = Data->S->Context.getCanonicalType(T); 4379 4380 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4381 } 4382 4383 for (Path.Decls = BaseRecord->lookup(Name); 4384 Path.Decls.first != Path.Decls.second; 4385 ++Path.Decls.first) { 4386 NamedDecl *D = *Path.Decls.first; 4387 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4388 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4389 return true; 4390 } 4391 } 4392 4393 return false; 4394} 4395 4396/// AddOverriddenMethods - See if a method overrides any in the base classes, 4397/// and if so, check that it's a valid override and remember it. 4398bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4399 // Look for virtual methods in base classes that this method might override. 4400 CXXBasePaths Paths; 4401 FindOverriddenMethodData Data; 4402 Data.Method = MD; 4403 Data.S = this; 4404 bool AddedAny = false; 4405 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4406 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4407 E = Paths.found_decls_end(); I != E; ++I) { 4408 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4409 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4410 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4411 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4412 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4413 AddedAny = true; 4414 } 4415 } 4416 } 4417 } 4418 4419 return AddedAny; 4420} 4421 4422namespace { 4423 // Struct for holding all of the extra arguments needed by 4424 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4425 struct ActOnFDArgs { 4426 Scope *S; 4427 Declarator &D; 4428 MultiTemplateParamsArg TemplateParamLists; 4429 bool AddToScope; 4430 }; 4431} 4432 4433/// \brief Generate diagnostics for an invalid function redeclaration. 4434/// 4435/// This routine handles generating the diagnostic messages for an invalid 4436/// function redeclaration, including finding possible similar declarations 4437/// or performing typo correction if there are no previous declarations with 4438/// the same name. 4439/// 4440/// Returns a NamedDecl iff typo correction was performed and substituting in 4441/// the new declaration name does not cause new errors. 4442static NamedDecl* DiagnoseInvalidRedeclaration( 4443 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4444 ActOnFDArgs &ExtraArgs) { 4445 NamedDecl *Result = NULL; 4446 DeclarationName Name = NewFD->getDeclName(); 4447 DeclContext *NewDC = NewFD->getDeclContext(); 4448 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4449 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4450 llvm::SmallVector<unsigned, 1> MismatchedParams; 4451 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4452 TypoCorrection Correction; 4453 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4454 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4455 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4456 : diag::err_member_def_does_not_match; 4457 4458 NewFD->setInvalidDecl(); 4459 SemaRef.LookupQualifiedName(Prev, NewDC); 4460 assert(!Prev.isAmbiguous() && 4461 "Cannot have an ambiguity in previous-declaration lookup"); 4462 if (!Prev.empty()) { 4463 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4464 Func != FuncEnd; ++Func) { 4465 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4466 if (FD && 4467 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4468 // Add 1 to the index so that 0 can mean the mismatch didn't 4469 // involve a parameter 4470 unsigned ParamNum = 4471 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4472 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4473 } 4474 } 4475 // If the qualified name lookup yielded nothing, try typo correction 4476 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4477 Prev.getLookupKind(), 0, 0, NewDC)) && 4478 Correction.getCorrection() != Name) { 4479 // Trap errors. 4480 Sema::SFINAETrap Trap(SemaRef); 4481 4482 // Set up everything for the call to ActOnFunctionDeclarator 4483 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4484 ExtraArgs.D.getIdentifierLoc()); 4485 Previous.clear(); 4486 Previous.setLookupName(Correction.getCorrection()); 4487 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4488 CDeclEnd = Correction.end(); 4489 CDecl != CDeclEnd; ++CDecl) { 4490 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4491 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4492 MismatchedParams)) { 4493 Previous.addDecl(FD); 4494 } 4495 } 4496 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4497 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4498 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4499 // eliminate the need for the parameter pack ExtraArgs. 4500 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4501 NewFD->getDeclContext(), 4502 NewFD->getTypeSourceInfo(), 4503 Previous, 4504 ExtraArgs.TemplateParamLists, 4505 ExtraArgs.AddToScope); 4506 if (Trap.hasErrorOccurred()) { 4507 // Pretend the typo correction never occurred 4508 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4509 ExtraArgs.D.getIdentifierLoc()); 4510 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4511 Previous.clear(); 4512 Previous.setLookupName(Name); 4513 Result = NULL; 4514 } else { 4515 for (LookupResult::iterator Func = Previous.begin(), 4516 FuncEnd = Previous.end(); 4517 Func != FuncEnd; ++Func) { 4518 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4519 NearMatches.push_back(std::make_pair(FD, 0)); 4520 } 4521 } 4522 if (NearMatches.empty()) { 4523 // Ignore the correction if it didn't yield any close FunctionDecl matches 4524 Correction = TypoCorrection(); 4525 } else { 4526 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4527 : diag::err_member_def_does_not_match_suggest; 4528 } 4529 } 4530 4531 if (Correction) 4532 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4533 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4534 << FixItHint::CreateReplacement( 4535 NewFD->getLocation(), 4536 Correction.getAsString(SemaRef.getLangOptions())); 4537 else 4538 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4539 << Name << NewDC << NewFD->getLocation(); 4540 4541 bool NewFDisConst = false; 4542 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4543 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4544 4545 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4546 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4547 NearMatch != NearMatchEnd; ++NearMatch) { 4548 FunctionDecl *FD = NearMatch->first; 4549 bool FDisConst = false; 4550 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4551 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4552 4553 if (unsigned Idx = NearMatch->second) { 4554 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4555 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4556 diag::note_member_def_close_param_match) 4557 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4558 } else if (Correction) { 4559 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4560 << Correction.getQuoted(SemaRef.getLangOptions()); 4561 } else if (FDisConst != NewFDisConst) { 4562 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4563 << NewFDisConst << FD->getSourceRange().getEnd(); 4564 } else 4565 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4566 } 4567 return Result; 4568} 4569 4570static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4571 Declarator &D) { 4572 switch (D.getDeclSpec().getStorageClassSpec()) { 4573 default: llvm_unreachable("Unknown storage class!"); 4574 case DeclSpec::SCS_auto: 4575 case DeclSpec::SCS_register: 4576 case DeclSpec::SCS_mutable: 4577 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4578 diag::err_typecheck_sclass_func); 4579 D.setInvalidType(); 4580 break; 4581 case DeclSpec::SCS_unspecified: break; 4582 case DeclSpec::SCS_extern: return SC_Extern; 4583 case DeclSpec::SCS_static: { 4584 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4585 // C99 6.7.1p5: 4586 // The declaration of an identifier for a function that has 4587 // block scope shall have no explicit storage-class specifier 4588 // other than extern 4589 // See also (C++ [dcl.stc]p4). 4590 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4591 diag::err_static_block_func); 4592 break; 4593 } else 4594 return SC_Static; 4595 } 4596 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4597 } 4598 4599 // No explicit storage class has already been returned 4600 return SC_None; 4601} 4602 4603static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4604 DeclContext *DC, QualType &R, 4605 TypeSourceInfo *TInfo, 4606 FunctionDecl::StorageClass SC, 4607 bool &IsVirtualOkay) { 4608 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4609 DeclarationName Name = NameInfo.getName(); 4610 4611 FunctionDecl *NewFD = 0; 4612 bool isInline = D.getDeclSpec().isInlineSpecified(); 4613 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4614 FunctionDecl::StorageClass SCAsWritten 4615 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4616 4617 if (!SemaRef.getLangOptions().CPlusPlus) { 4618 // Determine whether the function was written with a 4619 // prototype. This true when: 4620 // - there is a prototype in the declarator, or 4621 // - the type R of the function is some kind of typedef or other reference 4622 // to a type name (which eventually refers to a function type). 4623 bool HasPrototype = 4624 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4625 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4626 4627 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4628 D.getSourceRange().getBegin(), NameInfo, R, 4629 TInfo, SC, SCAsWritten, isInline, 4630 HasPrototype); 4631 if (D.isInvalidType()) 4632 NewFD->setInvalidDecl(); 4633 4634 // Set the lexical context. 4635 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4636 4637 return NewFD; 4638 } 4639 4640 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4641 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4642 4643 // Check that the return type is not an abstract class type. 4644 // For record types, this is done by the AbstractClassUsageDiagnoser once 4645 // the class has been completely parsed. 4646 if (!DC->isRecord() && 4647 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4648 R->getAs<FunctionType>()->getResultType(), 4649 diag::err_abstract_type_in_decl, 4650 SemaRef.AbstractReturnType)) 4651 D.setInvalidType(); 4652 4653 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4654 // This is a C++ constructor declaration. 4655 assert(DC->isRecord() && 4656 "Constructors can only be declared in a member context"); 4657 4658 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4659 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4660 D.getSourceRange().getBegin(), NameInfo, 4661 R, TInfo, isExplicit, isInline, 4662 /*isImplicitlyDeclared=*/false, 4663 isConstexpr); 4664 4665 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4666 // This is a C++ destructor declaration. 4667 if (DC->isRecord()) { 4668 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4669 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4670 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4671 SemaRef.Context, Record, 4672 D.getSourceRange().getBegin(), 4673 NameInfo, R, TInfo, isInline, 4674 /*isImplicitlyDeclared=*/false); 4675 4676 // If the class is complete, then we now create the implicit exception 4677 // specification. If the class is incomplete or dependent, we can't do 4678 // it yet. 4679 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4680 Record->getDefinition() && !Record->isBeingDefined() && 4681 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4682 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4683 } 4684 4685 IsVirtualOkay = true; 4686 return NewDD; 4687 4688 } else { 4689 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4690 D.setInvalidType(); 4691 4692 // Create a FunctionDecl to satisfy the function definition parsing 4693 // code path. 4694 return FunctionDecl::Create(SemaRef.Context, DC, 4695 D.getSourceRange().getBegin(), 4696 D.getIdentifierLoc(), Name, R, TInfo, 4697 SC, SCAsWritten, isInline, 4698 /*hasPrototype=*/true, isConstexpr); 4699 } 4700 4701 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4702 if (!DC->isRecord()) { 4703 SemaRef.Diag(D.getIdentifierLoc(), 4704 diag::err_conv_function_not_member); 4705 return 0; 4706 } 4707 4708 SemaRef.CheckConversionDeclarator(D, R, SC); 4709 IsVirtualOkay = true; 4710 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4711 D.getSourceRange().getBegin(), NameInfo, 4712 R, TInfo, isInline, isExplicit, 4713 isConstexpr, SourceLocation()); 4714 4715 } else if (DC->isRecord()) { 4716 // If the name of the function is the same as the name of the record, 4717 // then this must be an invalid constructor that has a return type. 4718 // (The parser checks for a return type and makes the declarator a 4719 // constructor if it has no return type). 4720 if (Name.getAsIdentifierInfo() && 4721 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4722 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4723 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4724 << SourceRange(D.getIdentifierLoc()); 4725 return 0; 4726 } 4727 4728 bool isStatic = SC == SC_Static; 4729 4730 // [class.free]p1: 4731 // Any allocation function for a class T is a static member 4732 // (even if not explicitly declared static). 4733 if (Name.getCXXOverloadedOperator() == OO_New || 4734 Name.getCXXOverloadedOperator() == OO_Array_New) 4735 isStatic = true; 4736 4737 // [class.free]p6 Any deallocation function for a class X is a static member 4738 // (even if not explicitly declared static). 4739 if (Name.getCXXOverloadedOperator() == OO_Delete || 4740 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4741 isStatic = true; 4742 4743 IsVirtualOkay = !isStatic; 4744 4745 // This is a C++ method declaration. 4746 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4747 D.getSourceRange().getBegin(), NameInfo, R, 4748 TInfo, isStatic, SCAsWritten, isInline, 4749 isConstexpr, SourceLocation()); 4750 4751 } else { 4752 // Determine whether the function was written with a 4753 // prototype. This true when: 4754 // - we're in C++ (where every function has a prototype), 4755 return FunctionDecl::Create(SemaRef.Context, DC, 4756 D.getSourceRange().getBegin(), 4757 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4758 true/*HasPrototype*/, isConstexpr); 4759 } 4760} 4761 4762NamedDecl* 4763Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4764 TypeSourceInfo *TInfo, LookupResult &Previous, 4765 MultiTemplateParamsArg TemplateParamLists, 4766 bool &AddToScope) { 4767 QualType R = TInfo->getType(); 4768 4769 assert(R.getTypePtr()->isFunctionType()); 4770 4771 // TODO: consider using NameInfo for diagnostic. 4772 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4773 DeclarationName Name = NameInfo.getName(); 4774 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4775 4776 if (D.getDeclSpec().isThreadSpecified()) 4777 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4778 4779 // Do not allow returning a objc interface by-value. 4780 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4781 Diag(D.getIdentifierLoc(), 4782 diag::err_object_cannot_be_passed_returned_by_value) << 0 4783 << R->getAs<FunctionType>()->getResultType() 4784 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4785 4786 QualType T = R->getAs<FunctionType>()->getResultType(); 4787 T = Context.getObjCObjectPointerType(T); 4788 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4789 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4790 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4791 FPT->getNumArgs(), EPI); 4792 } 4793 else if (isa<FunctionNoProtoType>(R)) 4794 R = Context.getFunctionNoProtoType(T); 4795 } 4796 4797 bool isFriend = false; 4798 FunctionTemplateDecl *FunctionTemplate = 0; 4799 bool isExplicitSpecialization = false; 4800 bool isFunctionTemplateSpecialization = false; 4801 bool isDependentClassScopeExplicitSpecialization = false; 4802 bool isVirtualOkay = false; 4803 4804 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4805 isVirtualOkay); 4806 if (!NewFD) return 0; 4807 4808 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4809 NewFD->setTopLevelDeclInObjCContainer(); 4810 4811 if (getLangOptions().CPlusPlus) { 4812 bool isInline = D.getDeclSpec().isInlineSpecified(); 4813 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4814 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4815 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4816 isFriend = D.getDeclSpec().isFriendSpecified(); 4817 if (isFriend && !isInline && D.isFunctionDefinition()) { 4818 // C++ [class.friend]p5 4819 // A function can be defined in a friend declaration of a 4820 // class . . . . Such a function is implicitly inline. 4821 NewFD->setImplicitlyInline(); 4822 } 4823 4824 SetNestedNameSpecifier(NewFD, D); 4825 isExplicitSpecialization = false; 4826 isFunctionTemplateSpecialization = false; 4827 if (D.isInvalidType()) 4828 NewFD->setInvalidDecl(); 4829 4830 // Set the lexical context. If the declarator has a C++ 4831 // scope specifier, or is the object of a friend declaration, the 4832 // lexical context will be different from the semantic context. 4833 NewFD->setLexicalDeclContext(CurContext); 4834 4835 // Match up the template parameter lists with the scope specifier, then 4836 // determine whether we have a template or a template specialization. 4837 bool Invalid = false; 4838 if (TemplateParameterList *TemplateParams 4839 = MatchTemplateParametersToScopeSpecifier( 4840 D.getDeclSpec().getSourceRange().getBegin(), 4841 D.getIdentifierLoc(), 4842 D.getCXXScopeSpec(), 4843 TemplateParamLists.get(), 4844 TemplateParamLists.size(), 4845 isFriend, 4846 isExplicitSpecialization, 4847 Invalid)) { 4848 if (TemplateParams->size() > 0) { 4849 // This is a function template 4850 4851 // Check that we can declare a template here. 4852 if (CheckTemplateDeclScope(S, TemplateParams)) 4853 return 0; 4854 4855 // A destructor cannot be a template. 4856 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4857 Diag(NewFD->getLocation(), diag::err_destructor_template); 4858 return 0; 4859 } 4860 4861 // If we're adding a template to a dependent context, we may need to 4862 // rebuilding some of the types used within the template parameter list, 4863 // now that we know what the current instantiation is. 4864 if (DC->isDependentContext()) { 4865 ContextRAII SavedContext(*this, DC); 4866 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4867 Invalid = true; 4868 } 4869 4870 4871 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4872 NewFD->getLocation(), 4873 Name, TemplateParams, 4874 NewFD); 4875 FunctionTemplate->setLexicalDeclContext(CurContext); 4876 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4877 4878 // For source fidelity, store the other template param lists. 4879 if (TemplateParamLists.size() > 1) { 4880 NewFD->setTemplateParameterListsInfo(Context, 4881 TemplateParamLists.size() - 1, 4882 TemplateParamLists.release()); 4883 } 4884 } else { 4885 // This is a function template specialization. 4886 isFunctionTemplateSpecialization = true; 4887 // For source fidelity, store all the template param lists. 4888 NewFD->setTemplateParameterListsInfo(Context, 4889 TemplateParamLists.size(), 4890 TemplateParamLists.release()); 4891 4892 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4893 if (isFriend) { 4894 // We want to remove the "template<>", found here. 4895 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4896 4897 // If we remove the template<> and the name is not a 4898 // template-id, we're actually silently creating a problem: 4899 // the friend declaration will refer to an untemplated decl, 4900 // and clearly the user wants a template specialization. So 4901 // we need to insert '<>' after the name. 4902 SourceLocation InsertLoc; 4903 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4904 InsertLoc = D.getName().getSourceRange().getEnd(); 4905 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4906 } 4907 4908 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4909 << Name << RemoveRange 4910 << FixItHint::CreateRemoval(RemoveRange) 4911 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4912 } 4913 } 4914 } 4915 else { 4916 // All template param lists were matched against the scope specifier: 4917 // this is NOT (an explicit specialization of) a template. 4918 if (TemplateParamLists.size() > 0) 4919 // For source fidelity, store all the template param lists. 4920 NewFD->setTemplateParameterListsInfo(Context, 4921 TemplateParamLists.size(), 4922 TemplateParamLists.release()); 4923 } 4924 4925 if (Invalid) { 4926 NewFD->setInvalidDecl(); 4927 if (FunctionTemplate) 4928 FunctionTemplate->setInvalidDecl(); 4929 } 4930 4931 // C++ [dcl.fct.spec]p5: 4932 // The virtual specifier shall only be used in declarations of 4933 // nonstatic class member functions that appear within a 4934 // member-specification of a class declaration; see 10.3. 4935 // 4936 if (isVirtual && !NewFD->isInvalidDecl()) { 4937 if (!isVirtualOkay) { 4938 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4939 diag::err_virtual_non_function); 4940 } else if (!CurContext->isRecord()) { 4941 // 'virtual' was specified outside of the class. 4942 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4943 diag::err_virtual_out_of_class) 4944 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4945 } else if (NewFD->getDescribedFunctionTemplate()) { 4946 // C++ [temp.mem]p3: 4947 // A member function template shall not be virtual. 4948 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4949 diag::err_virtual_member_function_template) 4950 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4951 } else { 4952 // Okay: Add virtual to the method. 4953 NewFD->setVirtualAsWritten(true); 4954 } 4955 } 4956 4957 // C++ [dcl.fct.spec]p3: 4958 // The inline specifier shall not appear on a block scope function 4959 // declaration. 4960 if (isInline && !NewFD->isInvalidDecl()) { 4961 if (CurContext->isFunctionOrMethod()) { 4962 // 'inline' is not allowed on block scope function declaration. 4963 Diag(D.getDeclSpec().getInlineSpecLoc(), 4964 diag::err_inline_declaration_block_scope) << Name 4965 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4966 } 4967 } 4968 4969 // C++ [dcl.fct.spec]p6: 4970 // The explicit specifier shall be used only in the declaration of a 4971 // constructor or conversion function within its class definition; 4972 // see 12.3.1 and 12.3.2. 4973 if (isExplicit && !NewFD->isInvalidDecl()) { 4974 if (!CurContext->isRecord()) { 4975 // 'explicit' was specified outside of the class. 4976 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4977 diag::err_explicit_out_of_class) 4978 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4979 } else if (!isa<CXXConstructorDecl>(NewFD) && 4980 !isa<CXXConversionDecl>(NewFD)) { 4981 // 'explicit' was specified on a function that wasn't a constructor 4982 // or conversion function. 4983 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4984 diag::err_explicit_non_ctor_or_conv_function) 4985 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4986 } 4987 } 4988 4989 if (isConstexpr) { 4990 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4991 // are implicitly inline. 4992 NewFD->setImplicitlyInline(); 4993 4994 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4995 // be either constructors or to return a literal type. Therefore, 4996 // destructors cannot be declared constexpr. 4997 if (isa<CXXDestructorDecl>(NewFD)) 4998 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4999 } 5000 5001 // If __module_private__ was specified, mark the function accordingly. 5002 if (D.getDeclSpec().isModulePrivateSpecified()) { 5003 if (isFunctionTemplateSpecialization) { 5004 SourceLocation ModulePrivateLoc 5005 = D.getDeclSpec().getModulePrivateSpecLoc(); 5006 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5007 << 0 5008 << FixItHint::CreateRemoval(ModulePrivateLoc); 5009 } else { 5010 NewFD->setModulePrivate(); 5011 if (FunctionTemplate) 5012 FunctionTemplate->setModulePrivate(); 5013 } 5014 } 5015 5016 if (isFriend) { 5017 // For now, claim that the objects have no previous declaration. 5018 if (FunctionTemplate) { 5019 FunctionTemplate->setObjectOfFriendDecl(false); 5020 FunctionTemplate->setAccess(AS_public); 5021 } 5022 NewFD->setObjectOfFriendDecl(false); 5023 NewFD->setAccess(AS_public); 5024 } 5025 5026 // If a function is defined as defaulted or deleted, mark it as such now. 5027 switch (D.getFunctionDefinitionKind()) { 5028 case FDK_Declaration: 5029 case FDK_Definition: 5030 break; 5031 5032 case FDK_Defaulted: 5033 NewFD->setDefaulted(); 5034 break; 5035 5036 case FDK_Deleted: 5037 NewFD->setDeletedAsWritten(); 5038 break; 5039 } 5040 5041 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5042 D.isFunctionDefinition()) { 5043 // C++ [class.mfct]p2: 5044 // A member function may be defined (8.4) in its class definition, in 5045 // which case it is an inline member function (7.1.2) 5046 NewFD->setImplicitlyInline(); 5047 } 5048 5049 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5050 !CurContext->isRecord()) { 5051 // C++ [class.static]p1: 5052 // A data or function member of a class may be declared static 5053 // in a class definition, in which case it is a static member of 5054 // the class. 5055 5056 // Complain about the 'static' specifier if it's on an out-of-line 5057 // member function definition. 5058 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5059 diag::err_static_out_of_line) 5060 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5061 } 5062 } 5063 5064 // Filter out previous declarations that don't match the scope. 5065 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5066 isExplicitSpecialization || 5067 isFunctionTemplateSpecialization); 5068 5069 // Handle GNU asm-label extension (encoded as an attribute). 5070 if (Expr *E = (Expr*) D.getAsmLabel()) { 5071 // The parser guarantees this is a string. 5072 StringLiteral *SE = cast<StringLiteral>(E); 5073 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5074 SE->getString())); 5075 } 5076 5077 // Copy the parameter declarations from the declarator D to the function 5078 // declaration NewFD, if they are available. First scavenge them into Params. 5079 SmallVector<ParmVarDecl*, 16> Params; 5080 if (D.isFunctionDeclarator()) { 5081 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5082 5083 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5084 // function that takes no arguments, not a function that takes a 5085 // single void argument. 5086 // We let through "const void" here because Sema::GetTypeForDeclarator 5087 // already checks for that case. 5088 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5089 FTI.ArgInfo[0].Param && 5090 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5091 // Empty arg list, don't push any params. 5092 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5093 5094 // In C++, the empty parameter-type-list must be spelled "void"; a 5095 // typedef of void is not permitted. 5096 if (getLangOptions().CPlusPlus && 5097 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5098 bool IsTypeAlias = false; 5099 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5100 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5101 else if (const TemplateSpecializationType *TST = 5102 Param->getType()->getAs<TemplateSpecializationType>()) 5103 IsTypeAlias = TST->isTypeAlias(); 5104 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5105 << IsTypeAlias; 5106 } 5107 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5108 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5109 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5110 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5111 Param->setDeclContext(NewFD); 5112 Params.push_back(Param); 5113 5114 if (Param->isInvalidDecl()) 5115 NewFD->setInvalidDecl(); 5116 } 5117 } 5118 5119 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5120 // When we're declaring a function with a typedef, typeof, etc as in the 5121 // following example, we'll need to synthesize (unnamed) 5122 // parameters for use in the declaration. 5123 // 5124 // @code 5125 // typedef void fn(int); 5126 // fn f; 5127 // @endcode 5128 5129 // Synthesize a parameter for each argument type. 5130 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5131 AE = FT->arg_type_end(); AI != AE; ++AI) { 5132 ParmVarDecl *Param = 5133 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5134 Param->setScopeInfo(0, Params.size()); 5135 Params.push_back(Param); 5136 } 5137 } else { 5138 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5139 "Should not need args for typedef of non-prototype fn"); 5140 } 5141 5142 // Finally, we know we have the right number of parameters, install them. 5143 NewFD->setParams(Params); 5144 5145 // Process the non-inheritable attributes on this declaration. 5146 ProcessDeclAttributes(S, NewFD, D, 5147 /*NonInheritable=*/true, /*Inheritable=*/false); 5148 5149 if (!getLangOptions().CPlusPlus) { 5150 // Perform semantic checking on the function declaration. 5151 bool isExplicitSpecialization=false; 5152 if (!NewFD->isInvalidDecl()) { 5153 if (NewFD->getResultType()->isVariablyModifiedType()) { 5154 // Functions returning a variably modified type violate C99 6.7.5.2p2 5155 // because all functions have linkage. 5156 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5157 NewFD->setInvalidDecl(); 5158 } else { 5159 if (NewFD->isMain()) 5160 CheckMain(NewFD, D.getDeclSpec()); 5161 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5162 isExplicitSpecialization)); 5163 } 5164 } 5165 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5166 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5167 "previous declaration set still overloaded"); 5168 } else { 5169 // If the declarator is a template-id, translate the parser's template 5170 // argument list into our AST format. 5171 bool HasExplicitTemplateArgs = false; 5172 TemplateArgumentListInfo TemplateArgs; 5173 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5174 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5175 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5176 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5177 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5178 TemplateId->getTemplateArgs(), 5179 TemplateId->NumArgs); 5180 translateTemplateArguments(TemplateArgsPtr, 5181 TemplateArgs); 5182 TemplateArgsPtr.release(); 5183 5184 HasExplicitTemplateArgs = true; 5185 5186 if (NewFD->isInvalidDecl()) { 5187 HasExplicitTemplateArgs = false; 5188 } else if (FunctionTemplate) { 5189 // Function template with explicit template arguments. 5190 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5191 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5192 5193 HasExplicitTemplateArgs = false; 5194 } else if (!isFunctionTemplateSpecialization && 5195 !D.getDeclSpec().isFriendSpecified()) { 5196 // We have encountered something that the user meant to be a 5197 // specialization (because it has explicitly-specified template 5198 // arguments) but that was not introduced with a "template<>" (or had 5199 // too few of them). 5200 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5201 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5202 << FixItHint::CreateInsertion( 5203 D.getDeclSpec().getSourceRange().getBegin(), 5204 "template<> "); 5205 isFunctionTemplateSpecialization = true; 5206 } else { 5207 // "friend void foo<>(int);" is an implicit specialization decl. 5208 isFunctionTemplateSpecialization = true; 5209 } 5210 } else if (isFriend && isFunctionTemplateSpecialization) { 5211 // This combination is only possible in a recovery case; the user 5212 // wrote something like: 5213 // template <> friend void foo(int); 5214 // which we're recovering from as if the user had written: 5215 // friend void foo<>(int); 5216 // Go ahead and fake up a template id. 5217 HasExplicitTemplateArgs = true; 5218 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5219 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5220 } 5221 5222 // If it's a friend (and only if it's a friend), it's possible 5223 // that either the specialized function type or the specialized 5224 // template is dependent, and therefore matching will fail. In 5225 // this case, don't check the specialization yet. 5226 bool InstantiationDependent = false; 5227 if (isFunctionTemplateSpecialization && isFriend && 5228 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5229 TemplateSpecializationType::anyDependentTemplateArguments( 5230 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5231 InstantiationDependent))) { 5232 assert(HasExplicitTemplateArgs && 5233 "friend function specialization without template args"); 5234 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5235 Previous)) 5236 NewFD->setInvalidDecl(); 5237 } else if (isFunctionTemplateSpecialization) { 5238 if (CurContext->isDependentContext() && CurContext->isRecord() 5239 && !isFriend) { 5240 isDependentClassScopeExplicitSpecialization = true; 5241 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5242 diag::ext_function_specialization_in_class : 5243 diag::err_function_specialization_in_class) 5244 << NewFD->getDeclName(); 5245 } else if (CheckFunctionTemplateSpecialization(NewFD, 5246 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5247 Previous)) 5248 NewFD->setInvalidDecl(); 5249 5250 // C++ [dcl.stc]p1: 5251 // A storage-class-specifier shall not be specified in an explicit 5252 // specialization (14.7.3) 5253 if (SC != SC_None) { 5254 if (SC != NewFD->getStorageClass()) 5255 Diag(NewFD->getLocation(), 5256 diag::err_explicit_specialization_inconsistent_storage_class) 5257 << SC 5258 << FixItHint::CreateRemoval( 5259 D.getDeclSpec().getStorageClassSpecLoc()); 5260 5261 else 5262 Diag(NewFD->getLocation(), 5263 diag::ext_explicit_specialization_storage_class) 5264 << FixItHint::CreateRemoval( 5265 D.getDeclSpec().getStorageClassSpecLoc()); 5266 } 5267 5268 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5269 if (CheckMemberSpecialization(NewFD, Previous)) 5270 NewFD->setInvalidDecl(); 5271 } 5272 5273 // Perform semantic checking on the function declaration. 5274 if (!isDependentClassScopeExplicitSpecialization) { 5275 if (NewFD->isInvalidDecl()) { 5276 // If this is a class member, mark the class invalid immediately. 5277 // This avoids some consistency errors later. 5278 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5279 methodDecl->getParent()->setInvalidDecl(); 5280 } else { 5281 if (NewFD->isMain()) 5282 CheckMain(NewFD, D.getDeclSpec()); 5283 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5284 isExplicitSpecialization)); 5285 } 5286 } 5287 5288 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5289 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5290 "previous declaration set still overloaded"); 5291 5292 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5293 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5294 NewFD->setInvalidDecl(); 5295 5296 NamedDecl *PrincipalDecl = (FunctionTemplate 5297 ? cast<NamedDecl>(FunctionTemplate) 5298 : NewFD); 5299 5300 if (isFriend && D.isRedeclaration()) { 5301 AccessSpecifier Access = AS_public; 5302 if (!NewFD->isInvalidDecl()) 5303 Access = NewFD->getPreviousDeclaration()->getAccess(); 5304 5305 NewFD->setAccess(Access); 5306 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5307 5308 PrincipalDecl->setObjectOfFriendDecl(true); 5309 } 5310 5311 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5312 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5313 PrincipalDecl->setNonMemberOperator(); 5314 5315 // If we have a function template, check the template parameter 5316 // list. This will check and merge default template arguments. 5317 if (FunctionTemplate) { 5318 FunctionTemplateDecl *PrevTemplate = 5319 FunctionTemplate->getPreviousDeclaration(); 5320 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5321 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5322 D.getDeclSpec().isFriendSpecified() 5323 ? (D.isFunctionDefinition() 5324 ? TPC_FriendFunctionTemplateDefinition 5325 : TPC_FriendFunctionTemplate) 5326 : (D.getCXXScopeSpec().isSet() && 5327 DC && DC->isRecord() && 5328 DC->isDependentContext()) 5329 ? TPC_ClassTemplateMember 5330 : TPC_FunctionTemplate); 5331 } 5332 5333 if (NewFD->isInvalidDecl()) { 5334 // Ignore all the rest of this. 5335 } else if (!D.isRedeclaration()) { 5336 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5337 AddToScope }; 5338 // Fake up an access specifier if it's supposed to be a class member. 5339 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5340 NewFD->setAccess(AS_public); 5341 5342 // Qualified decls generally require a previous declaration. 5343 if (D.getCXXScopeSpec().isSet()) { 5344 // ...with the major exception of templated-scope or 5345 // dependent-scope friend declarations. 5346 5347 // TODO: we currently also suppress this check in dependent 5348 // contexts because (1) the parameter depth will be off when 5349 // matching friend templates and (2) we might actually be 5350 // selecting a friend based on a dependent factor. But there 5351 // are situations where these conditions don't apply and we 5352 // can actually do this check immediately. 5353 if (isFriend && 5354 (TemplateParamLists.size() || 5355 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5356 CurContext->isDependentContext())) { 5357 // ignore these 5358 } else { 5359 // The user tried to provide an out-of-line definition for a 5360 // function that is a member of a class or namespace, but there 5361 // was no such member function declared (C++ [class.mfct]p2, 5362 // C++ [namespace.memdef]p2). For example: 5363 // 5364 // class X { 5365 // void f() const; 5366 // }; 5367 // 5368 // void X::f() { } // ill-formed 5369 // 5370 // Complain about this problem, and attempt to suggest close 5371 // matches (e.g., those that differ only in cv-qualifiers and 5372 // whether the parameter types are references). 5373 5374 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5375 NewFD, 5376 ExtraArgs)) { 5377 AddToScope = ExtraArgs.AddToScope; 5378 return Result; 5379 } 5380 } 5381 5382 // Unqualified local friend declarations are required to resolve 5383 // to something. 5384 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5385 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5386 NewFD, 5387 ExtraArgs)) { 5388 AddToScope = ExtraArgs.AddToScope; 5389 return Result; 5390 } 5391 } 5392 5393 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5394 !isFriend && !isFunctionTemplateSpecialization && 5395 !isExplicitSpecialization) { 5396 // An out-of-line member function declaration must also be a 5397 // definition (C++ [dcl.meaning]p1). 5398 // Note that this is not the case for explicit specializations of 5399 // function templates or member functions of class templates, per 5400 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5401 // extension for compatibility with old SWIG code which likes to 5402 // generate them. 5403 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5404 << D.getCXXScopeSpec().getRange(); 5405 } 5406 } 5407 5408 5409 // Handle attributes. We need to have merged decls when handling attributes 5410 // (for example to check for conflicts, etc). 5411 // FIXME: This needs to happen before we merge declarations. Then, 5412 // let attribute merging cope with attribute conflicts. 5413 ProcessDeclAttributes(S, NewFD, D, 5414 /*NonInheritable=*/false, /*Inheritable=*/true); 5415 5416 // attributes declared post-definition are currently ignored 5417 // FIXME: This should happen during attribute merging 5418 if (D.isRedeclaration() && Previous.isSingleResult()) { 5419 const FunctionDecl *Def; 5420 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5421 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5422 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5423 Diag(Def->getLocation(), diag::note_previous_definition); 5424 } 5425 } 5426 5427 AddKnownFunctionAttributes(NewFD); 5428 5429 if (NewFD->hasAttr<OverloadableAttr>() && 5430 !NewFD->getType()->getAs<FunctionProtoType>()) { 5431 Diag(NewFD->getLocation(), 5432 diag::err_attribute_overloadable_no_prototype) 5433 << NewFD; 5434 5435 // Turn this into a variadic function with no parameters. 5436 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5437 FunctionProtoType::ExtProtoInfo EPI; 5438 EPI.Variadic = true; 5439 EPI.ExtInfo = FT->getExtInfo(); 5440 5441 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5442 NewFD->setType(R); 5443 } 5444 5445 // If there's a #pragma GCC visibility in scope, and this isn't a class 5446 // member, set the visibility of this function. 5447 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5448 AddPushedVisibilityAttribute(NewFD); 5449 5450 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5451 // marking the function. 5452 AddCFAuditedAttribute(NewFD); 5453 5454 // If this is a locally-scoped extern C function, update the 5455 // map of such names. 5456 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5457 && !NewFD->isInvalidDecl()) 5458 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5459 5460 // Set this FunctionDecl's range up to the right paren. 5461 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5462 5463 if (getLangOptions().CPlusPlus) { 5464 if (FunctionTemplate) { 5465 if (NewFD->isInvalidDecl()) 5466 FunctionTemplate->setInvalidDecl(); 5467 return FunctionTemplate; 5468 } 5469 } 5470 5471 MarkUnusedFileScopedDecl(NewFD); 5472 5473 if (getLangOptions().CUDA) 5474 if (IdentifierInfo *II = NewFD->getIdentifier()) 5475 if (!NewFD->isInvalidDecl() && 5476 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5477 if (II->isStr("cudaConfigureCall")) { 5478 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5479 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5480 5481 Context.setcudaConfigureCallDecl(NewFD); 5482 } 5483 } 5484 5485 // Here we have an function template explicit specialization at class scope. 5486 // The actually specialization will be postponed to template instatiation 5487 // time via the ClassScopeFunctionSpecializationDecl node. 5488 if (isDependentClassScopeExplicitSpecialization) { 5489 ClassScopeFunctionSpecializationDecl *NewSpec = 5490 ClassScopeFunctionSpecializationDecl::Create( 5491 Context, CurContext, SourceLocation(), 5492 cast<CXXMethodDecl>(NewFD)); 5493 CurContext->addDecl(NewSpec); 5494 AddToScope = false; 5495 } 5496 5497 return NewFD; 5498} 5499 5500/// \brief Perform semantic checking of a new function declaration. 5501/// 5502/// Performs semantic analysis of the new function declaration 5503/// NewFD. This routine performs all semantic checking that does not 5504/// require the actual declarator involved in the declaration, and is 5505/// used both for the declaration of functions as they are parsed 5506/// (called via ActOnDeclarator) and for the declaration of functions 5507/// that have been instantiated via C++ template instantiation (called 5508/// via InstantiateDecl). 5509/// 5510/// \param IsExplicitSpecialiation whether this new function declaration is 5511/// an explicit specialization of the previous declaration. 5512/// 5513/// This sets NewFD->isInvalidDecl() to true if there was an error. 5514/// 5515/// Returns true if the function declaration is a redeclaration. 5516bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5517 LookupResult &Previous, 5518 bool IsExplicitSpecialization) { 5519 assert(!NewFD->getResultType()->isVariablyModifiedType() 5520 && "Variably modified return types are not handled here"); 5521 5522 // Check for a previous declaration of this name. 5523 if (Previous.empty() && NewFD->isExternC()) { 5524 // Since we did not find anything by this name and we're declaring 5525 // an extern "C" function, look for a non-visible extern "C" 5526 // declaration with the same name. 5527 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5528 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5529 if (Pos != LocallyScopedExternalDecls.end()) 5530 Previous.addDecl(Pos->second); 5531 } 5532 5533 bool Redeclaration = false; 5534 5535 // Merge or overload the declaration with an existing declaration of 5536 // the same name, if appropriate. 5537 if (!Previous.empty()) { 5538 // Determine whether NewFD is an overload of PrevDecl or 5539 // a declaration that requires merging. If it's an overload, 5540 // there's no more work to do here; we'll just add the new 5541 // function to the scope. 5542 5543 NamedDecl *OldDecl = 0; 5544 if (!AllowOverloadingOfFunction(Previous, Context)) { 5545 Redeclaration = true; 5546 OldDecl = Previous.getFoundDecl(); 5547 } else { 5548 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5549 /*NewIsUsingDecl*/ false)) { 5550 case Ovl_Match: 5551 Redeclaration = true; 5552 break; 5553 5554 case Ovl_NonFunction: 5555 Redeclaration = true; 5556 break; 5557 5558 case Ovl_Overload: 5559 Redeclaration = false; 5560 break; 5561 } 5562 5563 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5564 // If a function name is overloadable in C, then every function 5565 // with that name must be marked "overloadable". 5566 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5567 << Redeclaration << NewFD; 5568 NamedDecl *OverloadedDecl = 0; 5569 if (Redeclaration) 5570 OverloadedDecl = OldDecl; 5571 else if (!Previous.empty()) 5572 OverloadedDecl = Previous.getRepresentativeDecl(); 5573 if (OverloadedDecl) 5574 Diag(OverloadedDecl->getLocation(), 5575 diag::note_attribute_overloadable_prev_overload); 5576 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5577 Context)); 5578 } 5579 } 5580 5581 if (Redeclaration) { 5582 // NewFD and OldDecl represent declarations that need to be 5583 // merged. 5584 if (MergeFunctionDecl(NewFD, OldDecl)) { 5585 NewFD->setInvalidDecl(); 5586 return Redeclaration; 5587 } 5588 5589 Previous.clear(); 5590 Previous.addDecl(OldDecl); 5591 5592 if (FunctionTemplateDecl *OldTemplateDecl 5593 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5594 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5595 FunctionTemplateDecl *NewTemplateDecl 5596 = NewFD->getDescribedFunctionTemplate(); 5597 assert(NewTemplateDecl && "Template/non-template mismatch"); 5598 if (CXXMethodDecl *Method 5599 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5600 Method->setAccess(OldTemplateDecl->getAccess()); 5601 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5602 } 5603 5604 // If this is an explicit specialization of a member that is a function 5605 // template, mark it as a member specialization. 5606 if (IsExplicitSpecialization && 5607 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5608 NewTemplateDecl->setMemberSpecialization(); 5609 assert(OldTemplateDecl->isMemberSpecialization()); 5610 } 5611 5612 } else { 5613 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5614 NewFD->setAccess(OldDecl->getAccess()); 5615 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5616 } 5617 } 5618 } 5619 5620 // Semantic checking for this function declaration (in isolation). 5621 if (getLangOptions().CPlusPlus) { 5622 // C++-specific checks. 5623 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5624 CheckConstructor(Constructor); 5625 } else if (CXXDestructorDecl *Destructor = 5626 dyn_cast<CXXDestructorDecl>(NewFD)) { 5627 CXXRecordDecl *Record = Destructor->getParent(); 5628 QualType ClassType = Context.getTypeDeclType(Record); 5629 5630 // FIXME: Shouldn't we be able to perform this check even when the class 5631 // type is dependent? Both gcc and edg can handle that. 5632 if (!ClassType->isDependentType()) { 5633 DeclarationName Name 5634 = Context.DeclarationNames.getCXXDestructorName( 5635 Context.getCanonicalType(ClassType)); 5636 if (NewFD->getDeclName() != Name) { 5637 Diag(NewFD->getLocation(), diag::err_destructor_name); 5638 NewFD->setInvalidDecl(); 5639 return Redeclaration; 5640 } 5641 } 5642 } else if (CXXConversionDecl *Conversion 5643 = dyn_cast<CXXConversionDecl>(NewFD)) { 5644 ActOnConversionDeclarator(Conversion); 5645 } 5646 5647 // Find any virtual functions that this function overrides. 5648 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5649 if (!Method->isFunctionTemplateSpecialization() && 5650 !Method->getDescribedFunctionTemplate()) { 5651 if (AddOverriddenMethods(Method->getParent(), Method)) { 5652 // If the function was marked as "static", we have a problem. 5653 if (NewFD->getStorageClass() == SC_Static) { 5654 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5655 << NewFD->getDeclName(); 5656 for (CXXMethodDecl::method_iterator 5657 Overridden = Method->begin_overridden_methods(), 5658 OverriddenEnd = Method->end_overridden_methods(); 5659 Overridden != OverriddenEnd; 5660 ++Overridden) { 5661 Diag((*Overridden)->getLocation(), 5662 diag::note_overridden_virtual_function); 5663 } 5664 } 5665 } 5666 } 5667 } 5668 5669 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5670 if (NewFD->isOverloadedOperator() && 5671 CheckOverloadedOperatorDeclaration(NewFD)) { 5672 NewFD->setInvalidDecl(); 5673 return Redeclaration; 5674 } 5675 5676 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5677 if (NewFD->getLiteralIdentifier() && 5678 CheckLiteralOperatorDeclaration(NewFD)) { 5679 NewFD->setInvalidDecl(); 5680 return Redeclaration; 5681 } 5682 5683 // In C++, check default arguments now that we have merged decls. Unless 5684 // the lexical context is the class, because in this case this is done 5685 // during delayed parsing anyway. 5686 if (!CurContext->isRecord()) 5687 CheckCXXDefaultArguments(NewFD); 5688 5689 // If this function declares a builtin function, check the type of this 5690 // declaration against the expected type for the builtin. 5691 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5692 ASTContext::GetBuiltinTypeError Error; 5693 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5694 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5695 // The type of this function differs from the type of the builtin, 5696 // so forget about the builtin entirely. 5697 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5698 } 5699 } 5700 } 5701 return Redeclaration; 5702} 5703 5704void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5705 // C++ [basic.start.main]p3: A program that declares main to be inline 5706 // or static is ill-formed. 5707 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5708 // shall not appear in a declaration of main. 5709 // static main is not an error under C99, but we should warn about it. 5710 if (FD->getStorageClass() == SC_Static) 5711 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5712 ? diag::err_static_main : diag::warn_static_main) 5713 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5714 if (FD->isInlineSpecified()) 5715 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5716 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5717 5718 QualType T = FD->getType(); 5719 assert(T->isFunctionType() && "function decl is not of function type"); 5720 const FunctionType* FT = T->getAs<FunctionType>(); 5721 5722 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5723 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5724 FD->setInvalidDecl(true); 5725 } 5726 5727 // Treat protoless main() as nullary. 5728 if (isa<FunctionNoProtoType>(FT)) return; 5729 5730 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5731 unsigned nparams = FTP->getNumArgs(); 5732 assert(FD->getNumParams() == nparams); 5733 5734 bool HasExtraParameters = (nparams > 3); 5735 5736 // Darwin passes an undocumented fourth argument of type char**. If 5737 // other platforms start sprouting these, the logic below will start 5738 // getting shifty. 5739 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5740 HasExtraParameters = false; 5741 5742 if (HasExtraParameters) { 5743 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5744 FD->setInvalidDecl(true); 5745 nparams = 3; 5746 } 5747 5748 // FIXME: a lot of the following diagnostics would be improved 5749 // if we had some location information about types. 5750 5751 QualType CharPP = 5752 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5753 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5754 5755 for (unsigned i = 0; i < nparams; ++i) { 5756 QualType AT = FTP->getArgType(i); 5757 5758 bool mismatch = true; 5759 5760 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5761 mismatch = false; 5762 else if (Expected[i] == CharPP) { 5763 // As an extension, the following forms are okay: 5764 // char const ** 5765 // char const * const * 5766 // char * const * 5767 5768 QualifierCollector qs; 5769 const PointerType* PT; 5770 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5771 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5772 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5773 qs.removeConst(); 5774 mismatch = !qs.empty(); 5775 } 5776 } 5777 5778 if (mismatch) { 5779 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5780 // TODO: suggest replacing given type with expected type 5781 FD->setInvalidDecl(true); 5782 } 5783 } 5784 5785 if (nparams == 1 && !FD->isInvalidDecl()) { 5786 Diag(FD->getLocation(), diag::warn_main_one_arg); 5787 } 5788 5789 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5790 Diag(FD->getLocation(), diag::err_main_template_decl); 5791 FD->setInvalidDecl(); 5792 } 5793} 5794 5795bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5796 // FIXME: Need strict checking. In C89, we need to check for 5797 // any assignment, increment, decrement, function-calls, or 5798 // commas outside of a sizeof. In C99, it's the same list, 5799 // except that the aforementioned are allowed in unevaluated 5800 // expressions. Everything else falls under the 5801 // "may accept other forms of constant expressions" exception. 5802 // (We never end up here for C++, so the constant expression 5803 // rules there don't matter.) 5804 if (Init->isConstantInitializer(Context, false)) 5805 return false; 5806 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5807 << Init->getSourceRange(); 5808 return true; 5809} 5810 5811namespace { 5812 // Visits an initialization expression to see if OrigDecl is evaluated in 5813 // its own initialization and throws a warning if it does. 5814 class SelfReferenceChecker 5815 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5816 Sema &S; 5817 Decl *OrigDecl; 5818 bool isRecordType; 5819 bool isPODType; 5820 5821 public: 5822 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5823 5824 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5825 S(S), OrigDecl(OrigDecl) { 5826 isPODType = false; 5827 isRecordType = false; 5828 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5829 isPODType = VD->getType().isPODType(S.Context); 5830 isRecordType = VD->getType()->isRecordType(); 5831 } 5832 } 5833 5834 void VisitExpr(Expr *E) { 5835 if (isa<ObjCMessageExpr>(*E)) return; 5836 if (isRecordType) { 5837 Expr *expr = E; 5838 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5839 ValueDecl *VD = ME->getMemberDecl(); 5840 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5841 expr = ME->getBase(); 5842 } 5843 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5844 HandleDeclRefExpr(DRE); 5845 return; 5846 } 5847 } 5848 Inherited::VisitExpr(E); 5849 } 5850 5851 void VisitMemberExpr(MemberExpr *E) { 5852 if (E->getType()->canDecayToPointerType()) return; 5853 if (isa<FieldDecl>(E->getMemberDecl())) 5854 if (DeclRefExpr *DRE 5855 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5856 HandleDeclRefExpr(DRE); 5857 return; 5858 } 5859 Inherited::VisitMemberExpr(E); 5860 } 5861 5862 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5863 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5864 (isRecordType && E->getCastKind() == CK_NoOp)) { 5865 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5866 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5867 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5868 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5869 HandleDeclRefExpr(DRE); 5870 return; 5871 } 5872 } 5873 Inherited::VisitImplicitCastExpr(E); 5874 } 5875 5876 void VisitUnaryOperator(UnaryOperator *E) { 5877 // For POD record types, addresses of its own members are well-defined. 5878 if (isRecordType && isPODType) return; 5879 Inherited::VisitUnaryOperator(E); 5880 } 5881 5882 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5883 Decl* ReferenceDecl = DRE->getDecl(); 5884 if (OrigDecl != ReferenceDecl) return; 5885 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5886 Sema::NotForRedeclaration); 5887 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5888 S.PDiag(diag::warn_uninit_self_reference_in_init) 5889 << Result.getLookupName() 5890 << OrigDecl->getLocation() 5891 << DRE->getSourceRange()); 5892 } 5893 }; 5894} 5895 5896/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5897void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5898 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5899} 5900 5901/// AddInitializerToDecl - Adds the initializer Init to the 5902/// declaration dcl. If DirectInit is true, this is C++ direct 5903/// initialization rather than copy initialization. 5904void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5905 bool DirectInit, bool TypeMayContainAuto) { 5906 // If there is no declaration, there was an error parsing it. Just ignore 5907 // the initializer. 5908 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5909 return; 5910 5911 // Check for self-references within variable initializers. 5912 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5913 // Variables declared within a function/method body are handled 5914 // by a dataflow analysis. 5915 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5916 CheckSelfReference(RealDecl, Init); 5917 } 5918 else { 5919 CheckSelfReference(RealDecl, Init); 5920 } 5921 5922 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5923 // With declarators parsed the way they are, the parser cannot 5924 // distinguish between a normal initializer and a pure-specifier. 5925 // Thus this grotesque test. 5926 IntegerLiteral *IL; 5927 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5928 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5929 CheckPureMethod(Method, Init->getSourceRange()); 5930 else { 5931 Diag(Method->getLocation(), diag::err_member_function_initialization) 5932 << Method->getDeclName() << Init->getSourceRange(); 5933 Method->setInvalidDecl(); 5934 } 5935 return; 5936 } 5937 5938 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5939 if (!VDecl) { 5940 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5941 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5942 RealDecl->setInvalidDecl(); 5943 return; 5944 } 5945 5946 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5947 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5948 TypeSourceInfo *DeducedType = 0; 5949 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5950 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5951 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5952 << Init->getSourceRange(); 5953 if (!DeducedType) { 5954 RealDecl->setInvalidDecl(); 5955 return; 5956 } 5957 VDecl->setTypeSourceInfo(DeducedType); 5958 VDecl->setType(DeducedType->getType()); 5959 5960 // In ARC, infer lifetime. 5961 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5962 VDecl->setInvalidDecl(); 5963 5964 // If this is a redeclaration, check that the type we just deduced matches 5965 // the previously declared type. 5966 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5967 MergeVarDeclTypes(VDecl, Old); 5968 } 5969 5970 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 5971 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 5972 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5973 VDecl->setInvalidDecl(); 5974 return; 5975 } 5976 5977 5978 // A definition must end up with a complete type, which means it must be 5979 // complete with the restriction that an array type might be completed by the 5980 // initializer; note that later code assumes this restriction. 5981 QualType BaseDeclType = VDecl->getType(); 5982 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5983 BaseDeclType = Array->getElementType(); 5984 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5985 diag::err_typecheck_decl_incomplete_type)) { 5986 RealDecl->setInvalidDecl(); 5987 return; 5988 } 5989 5990 // The variable can not have an abstract class type. 5991 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5992 diag::err_abstract_type_in_decl, 5993 AbstractVariableType)) 5994 VDecl->setInvalidDecl(); 5995 5996 const VarDecl *Def; 5997 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5998 Diag(VDecl->getLocation(), diag::err_redefinition) 5999 << VDecl->getDeclName(); 6000 Diag(Def->getLocation(), diag::note_previous_definition); 6001 VDecl->setInvalidDecl(); 6002 return; 6003 } 6004 6005 const VarDecl* PrevInit = 0; 6006 if (getLangOptions().CPlusPlus) { 6007 // C++ [class.static.data]p4 6008 // If a static data member is of const integral or const 6009 // enumeration type, its declaration in the class definition can 6010 // specify a constant-initializer which shall be an integral 6011 // constant expression (5.19). In that case, the member can appear 6012 // in integral constant expressions. The member shall still be 6013 // defined in a namespace scope if it is used in the program and the 6014 // namespace scope definition shall not contain an initializer. 6015 // 6016 // We already performed a redefinition check above, but for static 6017 // data members we also need to check whether there was an in-class 6018 // declaration with an initializer. 6019 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6020 Diag(VDecl->getLocation(), diag::err_redefinition) 6021 << VDecl->getDeclName(); 6022 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6023 return; 6024 } 6025 6026 if (VDecl->hasLocalStorage()) 6027 getCurFunction()->setHasBranchProtectedScope(); 6028 6029 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6030 VDecl->setInvalidDecl(); 6031 return; 6032 } 6033 } 6034 6035 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6036 // a kernel function cannot be initialized." 6037 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6038 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6039 VDecl->setInvalidDecl(); 6040 return; 6041 } 6042 6043 // Get the decls type and save a reference for later, since 6044 // CheckInitializerTypes may change it. 6045 QualType DclT = VDecl->getType(), SavT = DclT; 6046 6047 // Perform the initialization. 6048 if (!VDecl->isInvalidDecl()) { 6049 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6050 InitializationKind Kind 6051 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6052 Init->getLocStart(), 6053 Init->getLocEnd()) 6054 : InitializationKind::CreateCopy(VDecl->getLocation(), 6055 Init->getLocStart()); 6056 6057 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6058 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6059 MultiExprArg(*this, &Init, 1), 6060 &DclT); 6061 if (Result.isInvalid()) { 6062 VDecl->setInvalidDecl(); 6063 return; 6064 } 6065 6066 Init = Result.takeAs<Expr>(); 6067 } 6068 6069 // If the type changed, it means we had an incomplete type that was 6070 // completed by the initializer. For example: 6071 // int ary[] = { 1, 3, 5 }; 6072 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6073 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6074 VDecl->setType(DclT); 6075 Init->setType(DclT.getNonReferenceType()); 6076 } 6077 6078 // Check any implicit conversions within the expression. 6079 CheckImplicitConversions(Init, VDecl->getLocation()); 6080 6081 if (!VDecl->isInvalidDecl()) 6082 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6083 6084 Init = MaybeCreateExprWithCleanups(Init); 6085 // Attach the initializer to the decl. 6086 VDecl->setInit(Init); 6087 6088 if (VDecl->isLocalVarDecl()) { 6089 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6090 // static storage duration shall be constant expressions or string literals. 6091 // C++ does not have this restriction. 6092 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6093 VDecl->getStorageClass() == SC_Static) 6094 CheckForConstantInitializer(Init, DclT); 6095 } else if (VDecl->isStaticDataMember() && 6096 VDecl->getLexicalDeclContext()->isRecord()) { 6097 // This is an in-class initialization for a static data member, e.g., 6098 // 6099 // struct S { 6100 // static const int value = 17; 6101 // }; 6102 6103 // C++ [class.mem]p4: 6104 // A member-declarator can contain a constant-initializer only 6105 // if it declares a static member (9.4) of const integral or 6106 // const enumeration type, see 9.4.2. 6107 // 6108 // C++11 [class.static.data]p3: 6109 // If a non-volatile const static data member is of integral or 6110 // enumeration type, its declaration in the class definition can 6111 // specify a brace-or-equal-initializer in which every initalizer-clause 6112 // that is an assignment-expression is a constant expression. A static 6113 // data member of literal type can be declared in the class definition 6114 // with the constexpr specifier; if so, its declaration shall specify a 6115 // brace-or-equal-initializer in which every initializer-clause that is 6116 // an assignment-expression is a constant expression. 6117 6118 // Do nothing on dependent types. 6119 if (DclT->isDependentType()) { 6120 6121 // Allow any 'static constexpr' members, whether or not they are of literal 6122 // type. We separately check that the initializer is a constant expression, 6123 // which implicitly requires the member to be of literal type. 6124 } else if (VDecl->isConstexpr()) { 6125 6126 // Require constness. 6127 } else if (!DclT.isConstQualified()) { 6128 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6129 << Init->getSourceRange(); 6130 VDecl->setInvalidDecl(); 6131 6132 // We allow integer constant expressions in all cases. 6133 } else if (DclT->isIntegralOrEnumerationType()) { 6134 // Check whether the expression is a constant expression. 6135 SourceLocation Loc; 6136 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6137 // In C++11, a non-constexpr const static data member with an 6138 // in-class initializer cannot be volatile. 6139 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6140 else if (Init->isValueDependent()) 6141 ; // Nothing to check. 6142 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6143 ; // Ok, it's an ICE! 6144 else if (Init->isEvaluatable(Context)) { 6145 // If we can constant fold the initializer through heroics, accept it, 6146 // but report this as a use of an extension for -pedantic. 6147 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6148 << Init->getSourceRange(); 6149 } else { 6150 // Otherwise, this is some crazy unknown case. Report the issue at the 6151 // location provided by the isIntegerConstantExpr failed check. 6152 Diag(Loc, diag::err_in_class_initializer_non_constant) 6153 << Init->getSourceRange(); 6154 VDecl->setInvalidDecl(); 6155 } 6156 6157 // We allow foldable floating-point constants as an extension. 6158 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6159 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6160 << DclT << Init->getSourceRange(); 6161 if (getLangOptions().CPlusPlus0x) 6162 Diag(VDecl->getLocation(), 6163 diag::note_in_class_initializer_float_type_constexpr) 6164 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6165 6166 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6167 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6168 << Init->getSourceRange(); 6169 VDecl->setInvalidDecl(); 6170 } 6171 6172 // Suggest adding 'constexpr' in C++11 for literal types. 6173 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6174 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6175 << DclT << Init->getSourceRange() 6176 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6177 VDecl->setConstexpr(true); 6178 6179 } else { 6180 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6181 << DclT << Init->getSourceRange(); 6182 VDecl->setInvalidDecl(); 6183 } 6184 } else if (VDecl->isFileVarDecl()) { 6185 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6186 (!getLangOptions().CPlusPlus || 6187 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6188 Diag(VDecl->getLocation(), diag::warn_extern_init); 6189 6190 // C99 6.7.8p4. All file scoped initializers need to be constant. 6191 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6192 CheckForConstantInitializer(Init, DclT); 6193 } 6194 6195 CheckCompleteVariableDeclaration(VDecl); 6196} 6197 6198/// ActOnInitializerError - Given that there was an error parsing an 6199/// initializer for the given declaration, try to return to some form 6200/// of sanity. 6201void Sema::ActOnInitializerError(Decl *D) { 6202 // Our main concern here is re-establishing invariants like "a 6203 // variable's type is either dependent or complete". 6204 if (!D || D->isInvalidDecl()) return; 6205 6206 VarDecl *VD = dyn_cast<VarDecl>(D); 6207 if (!VD) return; 6208 6209 // Auto types are meaningless if we can't make sense of the initializer. 6210 if (ParsingInitForAutoVars.count(D)) { 6211 D->setInvalidDecl(); 6212 return; 6213 } 6214 6215 QualType Ty = VD->getType(); 6216 if (Ty->isDependentType()) return; 6217 6218 // Require a complete type. 6219 if (RequireCompleteType(VD->getLocation(), 6220 Context.getBaseElementType(Ty), 6221 diag::err_typecheck_decl_incomplete_type)) { 6222 VD->setInvalidDecl(); 6223 return; 6224 } 6225 6226 // Require an abstract type. 6227 if (RequireNonAbstractType(VD->getLocation(), Ty, 6228 diag::err_abstract_type_in_decl, 6229 AbstractVariableType)) { 6230 VD->setInvalidDecl(); 6231 return; 6232 } 6233 6234 // Don't bother complaining about constructors or destructors, 6235 // though. 6236} 6237 6238void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6239 bool TypeMayContainAuto) { 6240 // If there is no declaration, there was an error parsing it. Just ignore it. 6241 if (RealDecl == 0) 6242 return; 6243 6244 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6245 QualType Type = Var->getType(); 6246 6247 // C++0x [dcl.spec.auto]p3 6248 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6249 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6250 << Var->getDeclName() << Type; 6251 Var->setInvalidDecl(); 6252 return; 6253 } 6254 6255 // C++0x [class.static.data]p3: A static data member can be declared with 6256 // the constexpr specifier; if so, its declaration shall specify 6257 // a brace-or-equal-initializer. 6258 if (Var->isConstexpr() && Var->isStaticDataMember() && 6259 !Var->isThisDeclarationADefinition()) { 6260 Diag(Var->getLocation(), diag::err_constexpr_static_mem_var_requires_init) 6261 << Var->getDeclName(); 6262 Var->setInvalidDecl(); 6263 return; 6264 } 6265 6266 switch (Var->isThisDeclarationADefinition()) { 6267 case VarDecl::Definition: 6268 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6269 break; 6270 6271 // We have an out-of-line definition of a static data member 6272 // that has an in-class initializer, so we type-check this like 6273 // a declaration. 6274 // 6275 // Fall through 6276 6277 case VarDecl::DeclarationOnly: 6278 // It's only a declaration. 6279 6280 // Block scope. C99 6.7p7: If an identifier for an object is 6281 // declared with no linkage (C99 6.2.2p6), the type for the 6282 // object shall be complete. 6283 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6284 !Var->getLinkage() && !Var->isInvalidDecl() && 6285 RequireCompleteType(Var->getLocation(), Type, 6286 diag::err_typecheck_decl_incomplete_type)) 6287 Var->setInvalidDecl(); 6288 6289 // Make sure that the type is not abstract. 6290 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6291 RequireNonAbstractType(Var->getLocation(), Type, 6292 diag::err_abstract_type_in_decl, 6293 AbstractVariableType)) 6294 Var->setInvalidDecl(); 6295 return; 6296 6297 case VarDecl::TentativeDefinition: 6298 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6299 // object that has file scope without an initializer, and without a 6300 // storage-class specifier or with the storage-class specifier "static", 6301 // constitutes a tentative definition. Note: A tentative definition with 6302 // external linkage is valid (C99 6.2.2p5). 6303 if (!Var->isInvalidDecl()) { 6304 if (const IncompleteArrayType *ArrayT 6305 = Context.getAsIncompleteArrayType(Type)) { 6306 if (RequireCompleteType(Var->getLocation(), 6307 ArrayT->getElementType(), 6308 diag::err_illegal_decl_array_incomplete_type)) 6309 Var->setInvalidDecl(); 6310 } else if (Var->getStorageClass() == SC_Static) { 6311 // C99 6.9.2p3: If the declaration of an identifier for an object is 6312 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6313 // declared type shall not be an incomplete type. 6314 // NOTE: code such as the following 6315 // static struct s; 6316 // struct s { int a; }; 6317 // is accepted by gcc. Hence here we issue a warning instead of 6318 // an error and we do not invalidate the static declaration. 6319 // NOTE: to avoid multiple warnings, only check the first declaration. 6320 if (Var->getPreviousDeclaration() == 0) 6321 RequireCompleteType(Var->getLocation(), Type, 6322 diag::ext_typecheck_decl_incomplete_type); 6323 } 6324 } 6325 6326 // Record the tentative definition; we're done. 6327 if (!Var->isInvalidDecl()) 6328 TentativeDefinitions.push_back(Var); 6329 return; 6330 } 6331 6332 // Provide a specific diagnostic for uninitialized variable 6333 // definitions with incomplete array type. 6334 if (Type->isIncompleteArrayType()) { 6335 Diag(Var->getLocation(), 6336 diag::err_typecheck_incomplete_array_needs_initializer); 6337 Var->setInvalidDecl(); 6338 return; 6339 } 6340 6341 // Provide a specific diagnostic for uninitialized variable 6342 // definitions with reference type. 6343 if (Type->isReferenceType()) { 6344 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6345 << Var->getDeclName() 6346 << SourceRange(Var->getLocation(), Var->getLocation()); 6347 Var->setInvalidDecl(); 6348 return; 6349 } 6350 6351 // Do not attempt to type-check the default initializer for a 6352 // variable with dependent type. 6353 if (Type->isDependentType()) 6354 return; 6355 6356 if (Var->isInvalidDecl()) 6357 return; 6358 6359 if (RequireCompleteType(Var->getLocation(), 6360 Context.getBaseElementType(Type), 6361 diag::err_typecheck_decl_incomplete_type)) { 6362 Var->setInvalidDecl(); 6363 return; 6364 } 6365 6366 // The variable can not have an abstract class type. 6367 if (RequireNonAbstractType(Var->getLocation(), Type, 6368 diag::err_abstract_type_in_decl, 6369 AbstractVariableType)) { 6370 Var->setInvalidDecl(); 6371 return; 6372 } 6373 6374 // Check for jumps past the implicit initializer. C++0x 6375 // clarifies that this applies to a "variable with automatic 6376 // storage duration", not a "local variable". 6377 // C++11 [stmt.dcl]p3 6378 // A program that jumps from a point where a variable with automatic 6379 // storage duration is not in scope to a point where it is in scope is 6380 // ill-formed unless the variable has scalar type, class type with a 6381 // trivial default constructor and a trivial destructor, a cv-qualified 6382 // version of one of these types, or an array of one of the preceding 6383 // types and is declared without an initializer. 6384 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6385 if (const RecordType *Record 6386 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6387 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6388 // Mark the function for further checking even if the looser rules of 6389 // C++11 do not require such checks, so that we can diagnose 6390 // incompatibilities with C++98. 6391 if (!CXXRecord->isPOD()) 6392 getCurFunction()->setHasBranchProtectedScope(); 6393 } 6394 } 6395 6396 // C++03 [dcl.init]p9: 6397 // If no initializer is specified for an object, and the 6398 // object is of (possibly cv-qualified) non-POD class type (or 6399 // array thereof), the object shall be default-initialized; if 6400 // the object is of const-qualified type, the underlying class 6401 // type shall have a user-declared default 6402 // constructor. Otherwise, if no initializer is specified for 6403 // a non- static object, the object and its subobjects, if 6404 // any, have an indeterminate initial value); if the object 6405 // or any of its subobjects are of const-qualified type, the 6406 // program is ill-formed. 6407 // C++0x [dcl.init]p11: 6408 // If no initializer is specified for an object, the object is 6409 // default-initialized; [...]. 6410 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6411 InitializationKind Kind 6412 = InitializationKind::CreateDefault(Var->getLocation()); 6413 6414 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6415 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6416 MultiExprArg(*this, 0, 0)); 6417 if (Init.isInvalid()) 6418 Var->setInvalidDecl(); 6419 else if (Init.get()) 6420 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6421 6422 CheckCompleteVariableDeclaration(Var); 6423 } 6424} 6425 6426void Sema::ActOnCXXForRangeDecl(Decl *D) { 6427 VarDecl *VD = dyn_cast<VarDecl>(D); 6428 if (!VD) { 6429 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6430 D->setInvalidDecl(); 6431 return; 6432 } 6433 6434 VD->setCXXForRangeDecl(true); 6435 6436 // for-range-declaration cannot be given a storage class specifier. 6437 int Error = -1; 6438 switch (VD->getStorageClassAsWritten()) { 6439 case SC_None: 6440 break; 6441 case SC_Extern: 6442 Error = 0; 6443 break; 6444 case SC_Static: 6445 Error = 1; 6446 break; 6447 case SC_PrivateExtern: 6448 Error = 2; 6449 break; 6450 case SC_Auto: 6451 Error = 3; 6452 break; 6453 case SC_Register: 6454 Error = 4; 6455 break; 6456 case SC_OpenCLWorkGroupLocal: 6457 llvm_unreachable("Unexpected storage class"); 6458 } 6459 if (VD->isConstexpr()) 6460 Error = 5; 6461 if (Error != -1) { 6462 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6463 << VD->getDeclName() << Error; 6464 D->setInvalidDecl(); 6465 } 6466} 6467 6468void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6469 if (var->isInvalidDecl()) return; 6470 6471 // In ARC, don't allow jumps past the implicit initialization of a 6472 // local retaining variable. 6473 if (getLangOptions().ObjCAutoRefCount && 6474 var->hasLocalStorage()) { 6475 switch (var->getType().getObjCLifetime()) { 6476 case Qualifiers::OCL_None: 6477 case Qualifiers::OCL_ExplicitNone: 6478 case Qualifiers::OCL_Autoreleasing: 6479 break; 6480 6481 case Qualifiers::OCL_Weak: 6482 case Qualifiers::OCL_Strong: 6483 getCurFunction()->setHasBranchProtectedScope(); 6484 break; 6485 } 6486 } 6487 6488 // All the following checks are C++ only. 6489 if (!getLangOptions().CPlusPlus) return; 6490 6491 QualType baseType = Context.getBaseElementType(var->getType()); 6492 if (baseType->isDependentType()) return; 6493 6494 // __block variables might require us to capture a copy-initializer. 6495 if (var->hasAttr<BlocksAttr>()) { 6496 // It's currently invalid to ever have a __block variable with an 6497 // array type; should we diagnose that here? 6498 6499 // Regardless, we don't want to ignore array nesting when 6500 // constructing this copy. 6501 QualType type = var->getType(); 6502 6503 if (type->isStructureOrClassType()) { 6504 SourceLocation poi = var->getLocation(); 6505 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6506 ExprResult result = 6507 PerformCopyInitialization( 6508 InitializedEntity::InitializeBlock(poi, type, false), 6509 poi, Owned(varRef)); 6510 if (!result.isInvalid()) { 6511 result = MaybeCreateExprWithCleanups(result); 6512 Expr *init = result.takeAs<Expr>(); 6513 Context.setBlockVarCopyInits(var, init); 6514 } 6515 } 6516 } 6517 6518 Expr *Init = var->getInit(); 6519 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6520 6521 if (!var->getDeclContext()->isDependentContext() && Init) { 6522 if (IsGlobal && !var->isConstexpr() && 6523 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6524 var->getLocation()) 6525 != DiagnosticsEngine::Ignored && 6526 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6527 Diag(var->getLocation(), diag::warn_global_constructor) 6528 << Init->getSourceRange(); 6529 6530 if (var->isConstexpr()) { 6531 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6532 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6533 SourceLocation DiagLoc = var->getLocation(); 6534 // If the note doesn't add any useful information other than a source 6535 // location, fold it into the primary diagnostic. 6536 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6537 diag::note_invalid_subexpr_in_const_expr) { 6538 DiagLoc = Notes[0].first; 6539 Notes.clear(); 6540 } 6541 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6542 << var << Init->getSourceRange(); 6543 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6544 Diag(Notes[I].first, Notes[I].second); 6545 } 6546 } else if (var->isUsableInConstantExpressions()) { 6547 // Check whether the initializer of a const variable of integral or 6548 // enumeration type is an ICE now, since we can't tell whether it was 6549 // initialized by a constant expression if we check later. 6550 var->checkInitIsICE(); 6551 } 6552 } 6553 6554 // Require the destructor. 6555 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6556 FinalizeVarWithDestructor(var, recordType); 6557} 6558 6559/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6560/// any semantic actions necessary after any initializer has been attached. 6561void 6562Sema::FinalizeDeclaration(Decl *ThisDecl) { 6563 // Note that we are no longer parsing the initializer for this declaration. 6564 ParsingInitForAutoVars.erase(ThisDecl); 6565} 6566 6567Sema::DeclGroupPtrTy 6568Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6569 Decl **Group, unsigned NumDecls) { 6570 SmallVector<Decl*, 8> Decls; 6571 6572 if (DS.isTypeSpecOwned()) 6573 Decls.push_back(DS.getRepAsDecl()); 6574 6575 for (unsigned i = 0; i != NumDecls; ++i) 6576 if (Decl *D = Group[i]) 6577 Decls.push_back(D); 6578 6579 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6580 DS.getTypeSpecType() == DeclSpec::TST_auto); 6581} 6582 6583/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6584/// group, performing any necessary semantic checking. 6585Sema::DeclGroupPtrTy 6586Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6587 bool TypeMayContainAuto) { 6588 // C++0x [dcl.spec.auto]p7: 6589 // If the type deduced for the template parameter U is not the same in each 6590 // deduction, the program is ill-formed. 6591 // FIXME: When initializer-list support is added, a distinction is needed 6592 // between the deduced type U and the deduced type which 'auto' stands for. 6593 // auto a = 0, b = { 1, 2, 3 }; 6594 // is legal because the deduced type U is 'int' in both cases. 6595 if (TypeMayContainAuto && NumDecls > 1) { 6596 QualType Deduced; 6597 CanQualType DeducedCanon; 6598 VarDecl *DeducedDecl = 0; 6599 for (unsigned i = 0; i != NumDecls; ++i) { 6600 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6601 AutoType *AT = D->getType()->getContainedAutoType(); 6602 // Don't reissue diagnostics when instantiating a template. 6603 if (AT && D->isInvalidDecl()) 6604 break; 6605 if (AT && AT->isDeduced()) { 6606 QualType U = AT->getDeducedType(); 6607 CanQualType UCanon = Context.getCanonicalType(U); 6608 if (Deduced.isNull()) { 6609 Deduced = U; 6610 DeducedCanon = UCanon; 6611 DeducedDecl = D; 6612 } else if (DeducedCanon != UCanon) { 6613 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6614 diag::err_auto_different_deductions) 6615 << Deduced << DeducedDecl->getDeclName() 6616 << U << D->getDeclName() 6617 << DeducedDecl->getInit()->getSourceRange() 6618 << D->getInit()->getSourceRange(); 6619 D->setInvalidDecl(); 6620 break; 6621 } 6622 } 6623 } 6624 } 6625 } 6626 6627 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6628} 6629 6630 6631/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6632/// to introduce parameters into function prototype scope. 6633Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6634 const DeclSpec &DS = D.getDeclSpec(); 6635 6636 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6637 // C++03 [dcl.stc]p2 also permits 'auto'. 6638 VarDecl::StorageClass StorageClass = SC_None; 6639 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6640 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6641 StorageClass = SC_Register; 6642 StorageClassAsWritten = SC_Register; 6643 } else if (getLangOptions().CPlusPlus && 6644 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6645 StorageClass = SC_Auto; 6646 StorageClassAsWritten = SC_Auto; 6647 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6648 Diag(DS.getStorageClassSpecLoc(), 6649 diag::err_invalid_storage_class_in_func_decl); 6650 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6651 } 6652 6653 if (D.getDeclSpec().isThreadSpecified()) 6654 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6655 if (D.getDeclSpec().isConstexprSpecified()) 6656 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6657 << 0; 6658 6659 DiagnoseFunctionSpecifiers(D); 6660 6661 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6662 QualType parmDeclType = TInfo->getType(); 6663 6664 if (getLangOptions().CPlusPlus) { 6665 // Check that there are no default arguments inside the type of this 6666 // parameter. 6667 CheckExtraCXXDefaultArguments(D); 6668 6669 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6670 if (D.getCXXScopeSpec().isSet()) { 6671 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6672 << D.getCXXScopeSpec().getRange(); 6673 D.getCXXScopeSpec().clear(); 6674 } 6675 } 6676 6677 // Ensure we have a valid name 6678 IdentifierInfo *II = 0; 6679 if (D.hasName()) { 6680 II = D.getIdentifier(); 6681 if (!II) { 6682 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6683 << GetNameForDeclarator(D).getName().getAsString(); 6684 D.setInvalidType(true); 6685 } 6686 } 6687 6688 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6689 if (II) { 6690 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6691 ForRedeclaration); 6692 LookupName(R, S); 6693 if (R.isSingleResult()) { 6694 NamedDecl *PrevDecl = R.getFoundDecl(); 6695 if (PrevDecl->isTemplateParameter()) { 6696 // Maybe we will complain about the shadowed template parameter. 6697 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6698 // Just pretend that we didn't see the previous declaration. 6699 PrevDecl = 0; 6700 } else if (S->isDeclScope(PrevDecl)) { 6701 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6702 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6703 6704 // Recover by removing the name 6705 II = 0; 6706 D.SetIdentifier(0, D.getIdentifierLoc()); 6707 D.setInvalidType(true); 6708 } 6709 } 6710 } 6711 6712 // Temporarily put parameter variables in the translation unit, not 6713 // the enclosing context. This prevents them from accidentally 6714 // looking like class members in C++. 6715 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6716 D.getSourceRange().getBegin(), 6717 D.getIdentifierLoc(), II, 6718 parmDeclType, TInfo, 6719 StorageClass, StorageClassAsWritten); 6720 6721 if (D.isInvalidType()) 6722 New->setInvalidDecl(); 6723 6724 assert(S->isFunctionPrototypeScope()); 6725 assert(S->getFunctionPrototypeDepth() >= 1); 6726 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6727 S->getNextFunctionPrototypeIndex()); 6728 6729 // Add the parameter declaration into this scope. 6730 S->AddDecl(New); 6731 if (II) 6732 IdResolver.AddDecl(New); 6733 6734 ProcessDeclAttributes(S, New, D); 6735 6736 if (D.getDeclSpec().isModulePrivateSpecified()) 6737 Diag(New->getLocation(), diag::err_module_private_local) 6738 << 1 << New->getDeclName() 6739 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6740 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6741 6742 if (New->hasAttr<BlocksAttr>()) { 6743 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6744 } 6745 return New; 6746} 6747 6748/// \brief Synthesizes a variable for a parameter arising from a 6749/// typedef. 6750ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6751 SourceLocation Loc, 6752 QualType T) { 6753 /* FIXME: setting StartLoc == Loc. 6754 Would it be worth to modify callers so as to provide proper source 6755 location for the unnamed parameters, embedding the parameter's type? */ 6756 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6757 T, Context.getTrivialTypeSourceInfo(T, Loc), 6758 SC_None, SC_None, 0); 6759 Param->setImplicit(); 6760 return Param; 6761} 6762 6763void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6764 ParmVarDecl * const *ParamEnd) { 6765 // Don't diagnose unused-parameter errors in template instantiations; we 6766 // will already have done so in the template itself. 6767 if (!ActiveTemplateInstantiations.empty()) 6768 return; 6769 6770 for (; Param != ParamEnd; ++Param) { 6771 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6772 !(*Param)->hasAttr<UnusedAttr>()) { 6773 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6774 << (*Param)->getDeclName(); 6775 } 6776 } 6777} 6778 6779void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6780 ParmVarDecl * const *ParamEnd, 6781 QualType ReturnTy, 6782 NamedDecl *D) { 6783 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6784 return; 6785 6786 // Warn if the return value is pass-by-value and larger than the specified 6787 // threshold. 6788 if (ReturnTy.isPODType(Context)) { 6789 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6790 if (Size > LangOpts.NumLargeByValueCopy) 6791 Diag(D->getLocation(), diag::warn_return_value_size) 6792 << D->getDeclName() << Size; 6793 } 6794 6795 // Warn if any parameter is pass-by-value and larger than the specified 6796 // threshold. 6797 for (; Param != ParamEnd; ++Param) { 6798 QualType T = (*Param)->getType(); 6799 if (!T.isPODType(Context)) 6800 continue; 6801 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6802 if (Size > LangOpts.NumLargeByValueCopy) 6803 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6804 << (*Param)->getDeclName() << Size; 6805 } 6806} 6807 6808ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6809 SourceLocation NameLoc, IdentifierInfo *Name, 6810 QualType T, TypeSourceInfo *TSInfo, 6811 VarDecl::StorageClass StorageClass, 6812 VarDecl::StorageClass StorageClassAsWritten) { 6813 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6814 if (getLangOptions().ObjCAutoRefCount && 6815 T.getObjCLifetime() == Qualifiers::OCL_None && 6816 T->isObjCLifetimeType()) { 6817 6818 Qualifiers::ObjCLifetime lifetime; 6819 6820 // Special cases for arrays: 6821 // - if it's const, use __unsafe_unretained 6822 // - otherwise, it's an error 6823 if (T->isArrayType()) { 6824 if (!T.isConstQualified()) { 6825 DelayedDiagnostics.add( 6826 sema::DelayedDiagnostic::makeForbiddenType( 6827 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6828 } 6829 lifetime = Qualifiers::OCL_ExplicitNone; 6830 } else { 6831 lifetime = T->getObjCARCImplicitLifetime(); 6832 } 6833 T = Context.getLifetimeQualifiedType(T, lifetime); 6834 } 6835 6836 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6837 Context.getAdjustedParameterType(T), 6838 TSInfo, 6839 StorageClass, StorageClassAsWritten, 6840 0); 6841 6842 // Parameters can not be abstract class types. 6843 // For record types, this is done by the AbstractClassUsageDiagnoser once 6844 // the class has been completely parsed. 6845 if (!CurContext->isRecord() && 6846 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6847 AbstractParamType)) 6848 New->setInvalidDecl(); 6849 6850 // Parameter declarators cannot be interface types. All ObjC objects are 6851 // passed by reference. 6852 if (T->isObjCObjectType()) { 6853 Diag(NameLoc, 6854 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6855 << FixItHint::CreateInsertion(NameLoc, "*"); 6856 T = Context.getObjCObjectPointerType(T); 6857 New->setType(T); 6858 } 6859 6860 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6861 // duration shall not be qualified by an address-space qualifier." 6862 // Since all parameters have automatic store duration, they can not have 6863 // an address space. 6864 if (T.getAddressSpace() != 0) { 6865 Diag(NameLoc, diag::err_arg_with_address_space); 6866 New->setInvalidDecl(); 6867 } 6868 6869 return New; 6870} 6871 6872void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6873 SourceLocation LocAfterDecls) { 6874 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6875 6876 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6877 // for a K&R function. 6878 if (!FTI.hasPrototype) { 6879 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6880 --i; 6881 if (FTI.ArgInfo[i].Param == 0) { 6882 llvm::SmallString<256> Code; 6883 llvm::raw_svector_ostream(Code) << " int " 6884 << FTI.ArgInfo[i].Ident->getName() 6885 << ";\n"; 6886 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6887 << FTI.ArgInfo[i].Ident 6888 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6889 6890 // Implicitly declare the argument as type 'int' for lack of a better 6891 // type. 6892 AttributeFactory attrs; 6893 DeclSpec DS(attrs); 6894 const char* PrevSpec; // unused 6895 unsigned DiagID; // unused 6896 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6897 PrevSpec, DiagID); 6898 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6899 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6900 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6901 } 6902 } 6903 } 6904} 6905 6906Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6907 Declarator &D) { 6908 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6909 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6910 Scope *ParentScope = FnBodyScope->getParent(); 6911 6912 D.setFunctionDefinitionKind(FDK_Definition); 6913 Decl *DP = HandleDeclarator(ParentScope, D, 6914 MultiTemplateParamsArg(*this)); 6915 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6916} 6917 6918static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6919 // Don't warn about invalid declarations. 6920 if (FD->isInvalidDecl()) 6921 return false; 6922 6923 // Or declarations that aren't global. 6924 if (!FD->isGlobal()) 6925 return false; 6926 6927 // Don't warn about C++ member functions. 6928 if (isa<CXXMethodDecl>(FD)) 6929 return false; 6930 6931 // Don't warn about 'main'. 6932 if (FD->isMain()) 6933 return false; 6934 6935 // Don't warn about inline functions. 6936 if (FD->isInlined()) 6937 return false; 6938 6939 // Don't warn about function templates. 6940 if (FD->getDescribedFunctionTemplate()) 6941 return false; 6942 6943 // Don't warn about function template specializations. 6944 if (FD->isFunctionTemplateSpecialization()) 6945 return false; 6946 6947 bool MissingPrototype = true; 6948 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6949 Prev; Prev = Prev->getPreviousDeclaration()) { 6950 // Ignore any declarations that occur in function or method 6951 // scope, because they aren't visible from the header. 6952 if (Prev->getDeclContext()->isFunctionOrMethod()) 6953 continue; 6954 6955 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6956 break; 6957 } 6958 6959 return MissingPrototype; 6960} 6961 6962void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6963 // Don't complain if we're in GNU89 mode and the previous definition 6964 // was an extern inline function. 6965 const FunctionDecl *Definition; 6966 if (FD->isDefined(Definition) && 6967 !canRedefineFunction(Definition, getLangOptions())) { 6968 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6969 Definition->getStorageClass() == SC_Extern) 6970 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6971 << FD->getDeclName() << getLangOptions().CPlusPlus; 6972 else 6973 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6974 Diag(Definition->getLocation(), diag::note_previous_definition); 6975 } 6976} 6977 6978Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6979 // Clear the last template instantiation error context. 6980 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6981 6982 if (!D) 6983 return D; 6984 FunctionDecl *FD = 0; 6985 6986 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6987 FD = FunTmpl->getTemplatedDecl(); 6988 else 6989 FD = cast<FunctionDecl>(D); 6990 6991 // Enter a new function scope 6992 PushFunctionScope(); 6993 6994 // See if this is a redefinition. 6995 if (!FD->isLateTemplateParsed()) 6996 CheckForFunctionRedefinition(FD); 6997 6998 // Builtin functions cannot be defined. 6999 if (unsigned BuiltinID = FD->getBuiltinID()) { 7000 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7001 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7002 FD->setInvalidDecl(); 7003 } 7004 } 7005 7006 // The return type of a function definition must be complete 7007 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7008 QualType ResultType = FD->getResultType(); 7009 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7010 !FD->isInvalidDecl() && 7011 RequireCompleteType(FD->getLocation(), ResultType, 7012 diag::err_func_def_incomplete_result)) 7013 FD->setInvalidDecl(); 7014 7015 // GNU warning -Wmissing-prototypes: 7016 // Warn if a global function is defined without a previous 7017 // prototype declaration. This warning is issued even if the 7018 // definition itself provides a prototype. The aim is to detect 7019 // global functions that fail to be declared in header files. 7020 if (ShouldWarnAboutMissingPrototype(FD)) 7021 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7022 7023 if (FnBodyScope) 7024 PushDeclContext(FnBodyScope, FD); 7025 7026 // Check the validity of our function parameters 7027 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7028 /*CheckParameterNames=*/true); 7029 7030 // Introduce our parameters into the function scope 7031 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7032 ParmVarDecl *Param = FD->getParamDecl(p); 7033 Param->setOwningFunction(FD); 7034 7035 // If this has an identifier, add it to the scope stack. 7036 if (Param->getIdentifier() && FnBodyScope) { 7037 CheckShadow(FnBodyScope, Param); 7038 7039 PushOnScopeChains(Param, FnBodyScope); 7040 } 7041 } 7042 7043 // Checking attributes of current function definition 7044 // dllimport attribute. 7045 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7046 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7047 // dllimport attribute cannot be directly applied to definition. 7048 // Microsoft accepts dllimport for functions defined within class scope. 7049 if (!DA->isInherited() && 7050 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7051 Diag(FD->getLocation(), 7052 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7053 << "dllimport"; 7054 FD->setInvalidDecl(); 7055 return FD; 7056 } 7057 7058 // Visual C++ appears to not think this is an issue, so only issue 7059 // a warning when Microsoft extensions are disabled. 7060 if (!LangOpts.MicrosoftExt) { 7061 // If a symbol previously declared dllimport is later defined, the 7062 // attribute is ignored in subsequent references, and a warning is 7063 // emitted. 7064 Diag(FD->getLocation(), 7065 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7066 << FD->getName() << "dllimport"; 7067 } 7068 } 7069 return FD; 7070} 7071 7072/// \brief Given the set of return statements within a function body, 7073/// compute the variables that are subject to the named return value 7074/// optimization. 7075/// 7076/// Each of the variables that is subject to the named return value 7077/// optimization will be marked as NRVO variables in the AST, and any 7078/// return statement that has a marked NRVO variable as its NRVO candidate can 7079/// use the named return value optimization. 7080/// 7081/// This function applies a very simplistic algorithm for NRVO: if every return 7082/// statement in the function has the same NRVO candidate, that candidate is 7083/// the NRVO variable. 7084/// 7085/// FIXME: Employ a smarter algorithm that accounts for multiple return 7086/// statements and the lifetimes of the NRVO candidates. We should be able to 7087/// find a maximal set of NRVO variables. 7088void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7089 ReturnStmt **Returns = Scope->Returns.data(); 7090 7091 const VarDecl *NRVOCandidate = 0; 7092 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7093 if (!Returns[I]->getNRVOCandidate()) 7094 return; 7095 7096 if (!NRVOCandidate) 7097 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7098 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7099 return; 7100 } 7101 7102 if (NRVOCandidate) 7103 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7104} 7105 7106Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7107 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7108} 7109 7110Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7111 bool IsInstantiation) { 7112 FunctionDecl *FD = 0; 7113 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7114 if (FunTmpl) 7115 FD = FunTmpl->getTemplatedDecl(); 7116 else 7117 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7118 7119 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7120 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7121 7122 if (FD) { 7123 FD->setBody(Body); 7124 if (FD->isMain()) { 7125 // C and C++ allow for main to automagically return 0. 7126 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7127 FD->setHasImplicitReturnZero(true); 7128 WP.disableCheckFallThrough(); 7129 } else if (FD->hasAttr<NakedAttr>()) { 7130 // If the function is marked 'naked', don't complain about missing return 7131 // statements. 7132 WP.disableCheckFallThrough(); 7133 } 7134 7135 // MSVC permits the use of pure specifier (=0) on function definition, 7136 // defined at class scope, warn about this non standard construct. 7137 if (getLangOptions().MicrosoftExt && FD->isPure()) 7138 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7139 7140 if (!FD->isInvalidDecl()) { 7141 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7142 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7143 FD->getResultType(), FD); 7144 7145 // If this is a constructor, we need a vtable. 7146 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7147 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7148 7149 computeNRVO(Body, getCurFunction()); 7150 } 7151 7152 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7153 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7154 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7155 MD->setBody(Body); 7156 if (Body) 7157 MD->setEndLoc(Body->getLocEnd()); 7158 if (!MD->isInvalidDecl()) { 7159 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7160 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7161 MD->getResultType(), MD); 7162 7163 if (Body) 7164 computeNRVO(Body, getCurFunction()); 7165 } 7166 if (ObjCShouldCallSuperDealloc) { 7167 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7168 ObjCShouldCallSuperDealloc = false; 7169 } 7170 if (ObjCShouldCallSuperFinalize) { 7171 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7172 ObjCShouldCallSuperFinalize = false; 7173 } 7174 } else { 7175 return 0; 7176 } 7177 7178 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7179 "ObjC methods, which should have been handled in the block above."); 7180 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7181 "ObjC methods, which should have been handled in the block above."); 7182 7183 // Verify and clean out per-function state. 7184 if (Body) { 7185 // C++ constructors that have function-try-blocks can't have return 7186 // statements in the handlers of that block. (C++ [except.handle]p14) 7187 // Verify this. 7188 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7189 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7190 7191 // Verify that gotos and switch cases don't jump into scopes illegally. 7192 if (getCurFunction()->NeedsScopeChecking() && 7193 !dcl->isInvalidDecl() && 7194 !hasAnyUnrecoverableErrorsInThisFunction()) 7195 DiagnoseInvalidJumps(Body); 7196 7197 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7198 if (!Destructor->getParent()->isDependentType()) 7199 CheckDestructor(Destructor); 7200 7201 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7202 Destructor->getParent()); 7203 } 7204 7205 // If any errors have occurred, clear out any temporaries that may have 7206 // been leftover. This ensures that these temporaries won't be picked up for 7207 // deletion in some later function. 7208 if (PP.getDiagnostics().hasErrorOccurred() || 7209 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7210 DiscardCleanupsInEvaluationContext(); 7211 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7212 // Since the body is valid, issue any analysis-based warnings that are 7213 // enabled. 7214 ActivePolicy = &WP; 7215 } 7216 7217 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7218 !CheckConstexprFunctionBody(FD, Body)) 7219 FD->setInvalidDecl(); 7220 7221 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7222 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7223 } 7224 7225 if (!IsInstantiation) 7226 PopDeclContext(); 7227 7228 PopFunctionOrBlockScope(ActivePolicy, dcl); 7229 7230 // If any errors have occurred, clear out any temporaries that may have 7231 // been leftover. This ensures that these temporaries won't be picked up for 7232 // deletion in some later function. 7233 if (getDiagnostics().hasErrorOccurred()) { 7234 DiscardCleanupsInEvaluationContext(); 7235 } 7236 7237 return dcl; 7238} 7239 7240 7241/// When we finish delayed parsing of an attribute, we must attach it to the 7242/// relevant Decl. 7243void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7244 ParsedAttributes &Attrs) { 7245 ProcessDeclAttributeList(S, D, Attrs.getList()); 7246} 7247 7248 7249/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7250/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7251NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7252 IdentifierInfo &II, Scope *S) { 7253 // Before we produce a declaration for an implicitly defined 7254 // function, see whether there was a locally-scoped declaration of 7255 // this name as a function or variable. If so, use that 7256 // (non-visible) declaration, and complain about it. 7257 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7258 = findLocallyScopedExternalDecl(&II); 7259 if (Pos != LocallyScopedExternalDecls.end()) { 7260 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7261 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7262 return Pos->second; 7263 } 7264 7265 // Extension in C99. Legal in C90, but warn about it. 7266 unsigned diag_id; 7267 if (II.getName().startswith("__builtin_")) 7268 diag_id = diag::err_builtin_unknown; 7269 else if (getLangOptions().C99) 7270 diag_id = diag::ext_implicit_function_decl; 7271 else 7272 diag_id = diag::warn_implicit_function_decl; 7273 Diag(Loc, diag_id) << &II; 7274 7275 // Because typo correction is expensive, only do it if the implicit 7276 // function declaration is going to be treated as an error. 7277 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7278 TypoCorrection Corrected; 7279 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7280 LookupOrdinaryName, S, 0))) { 7281 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7282 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7283 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7284 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7285 7286 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7287 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7288 7289 if (Func->getLocation().isValid() 7290 && !II.getName().startswith("__builtin_")) 7291 Diag(Func->getLocation(), diag::note_previous_decl) 7292 << CorrectedQuotedStr; 7293 } 7294 } 7295 } 7296 7297 // Set a Declarator for the implicit definition: int foo(); 7298 const char *Dummy; 7299 AttributeFactory attrFactory; 7300 DeclSpec DS(attrFactory); 7301 unsigned DiagID; 7302 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7303 (void)Error; // Silence warning. 7304 assert(!Error && "Error setting up implicit decl!"); 7305 Declarator D(DS, Declarator::BlockContext); 7306 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7307 0, 0, true, SourceLocation(), 7308 SourceLocation(), SourceLocation(), 7309 SourceLocation(), 7310 EST_None, SourceLocation(), 7311 0, 0, 0, 0, Loc, Loc, D), 7312 DS.getAttributes(), 7313 SourceLocation()); 7314 D.SetIdentifier(&II, Loc); 7315 7316 // Insert this function into translation-unit scope. 7317 7318 DeclContext *PrevDC = CurContext; 7319 CurContext = Context.getTranslationUnitDecl(); 7320 7321 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7322 FD->setImplicit(); 7323 7324 CurContext = PrevDC; 7325 7326 AddKnownFunctionAttributes(FD); 7327 7328 return FD; 7329} 7330 7331/// \brief Adds any function attributes that we know a priori based on 7332/// the declaration of this function. 7333/// 7334/// These attributes can apply both to implicitly-declared builtins 7335/// (like __builtin___printf_chk) or to library-declared functions 7336/// like NSLog or printf. 7337/// 7338/// We need to check for duplicate attributes both here and where user-written 7339/// attributes are applied to declarations. 7340void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7341 if (FD->isInvalidDecl()) 7342 return; 7343 7344 // If this is a built-in function, map its builtin attributes to 7345 // actual attributes. 7346 if (unsigned BuiltinID = FD->getBuiltinID()) { 7347 // Handle printf-formatting attributes. 7348 unsigned FormatIdx; 7349 bool HasVAListArg; 7350 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7351 if (!FD->getAttr<FormatAttr>()) 7352 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7353 "printf", FormatIdx+1, 7354 HasVAListArg ? 0 : FormatIdx+2)); 7355 } 7356 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7357 HasVAListArg)) { 7358 if (!FD->getAttr<FormatAttr>()) 7359 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7360 "scanf", FormatIdx+1, 7361 HasVAListArg ? 0 : FormatIdx+2)); 7362 } 7363 7364 // Mark const if we don't care about errno and that is the only 7365 // thing preventing the function from being const. This allows 7366 // IRgen to use LLVM intrinsics for such functions. 7367 if (!getLangOptions().MathErrno && 7368 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7369 if (!FD->getAttr<ConstAttr>()) 7370 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7371 } 7372 7373 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7374 !FD->getAttr<ReturnsTwiceAttr>()) 7375 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7376 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7377 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7378 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7379 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7380 } 7381 7382 IdentifierInfo *Name = FD->getIdentifier(); 7383 if (!Name) 7384 return; 7385 if ((!getLangOptions().CPlusPlus && 7386 FD->getDeclContext()->isTranslationUnit()) || 7387 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7388 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7389 LinkageSpecDecl::lang_c)) { 7390 // Okay: this could be a libc/libm/Objective-C function we know 7391 // about. 7392 } else 7393 return; 7394 7395 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7396 // FIXME: NSLog and NSLogv should be target specific 7397 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7398 // FIXME: We known better than our headers. 7399 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7400 } else 7401 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7402 "printf", 1, 7403 Name->isStr("NSLogv") ? 0 : 2)); 7404 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7405 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7406 // target-specific builtins, perhaps? 7407 if (!FD->getAttr<FormatAttr>()) 7408 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7409 "printf", 2, 7410 Name->isStr("vasprintf") ? 0 : 3)); 7411 } 7412} 7413 7414TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7415 TypeSourceInfo *TInfo) { 7416 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7417 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7418 7419 if (!TInfo) { 7420 assert(D.isInvalidType() && "no declarator info for valid type"); 7421 TInfo = Context.getTrivialTypeSourceInfo(T); 7422 } 7423 7424 // Scope manipulation handled by caller. 7425 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7426 D.getSourceRange().getBegin(), 7427 D.getIdentifierLoc(), 7428 D.getIdentifier(), 7429 TInfo); 7430 7431 // Bail out immediately if we have an invalid declaration. 7432 if (D.isInvalidType()) { 7433 NewTD->setInvalidDecl(); 7434 return NewTD; 7435 } 7436 7437 if (D.getDeclSpec().isModulePrivateSpecified()) { 7438 if (CurContext->isFunctionOrMethod()) 7439 Diag(NewTD->getLocation(), diag::err_module_private_local) 7440 << 2 << NewTD->getDeclName() 7441 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7442 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7443 else 7444 NewTD->setModulePrivate(); 7445 } 7446 7447 // C++ [dcl.typedef]p8: 7448 // If the typedef declaration defines an unnamed class (or 7449 // enum), the first typedef-name declared by the declaration 7450 // to be that class type (or enum type) is used to denote the 7451 // class type (or enum type) for linkage purposes only. 7452 // We need to check whether the type was declared in the declaration. 7453 switch (D.getDeclSpec().getTypeSpecType()) { 7454 case TST_enum: 7455 case TST_struct: 7456 case TST_union: 7457 case TST_class: { 7458 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7459 7460 // Do nothing if the tag is not anonymous or already has an 7461 // associated typedef (from an earlier typedef in this decl group). 7462 if (tagFromDeclSpec->getIdentifier()) break; 7463 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7464 7465 // A well-formed anonymous tag must always be a TUK_Definition. 7466 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7467 7468 // The type must match the tag exactly; no qualifiers allowed. 7469 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7470 break; 7471 7472 // Otherwise, set this is the anon-decl typedef for the tag. 7473 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7474 break; 7475 } 7476 7477 default: 7478 break; 7479 } 7480 7481 return NewTD; 7482} 7483 7484 7485/// \brief Determine whether a tag with a given kind is acceptable 7486/// as a redeclaration of the given tag declaration. 7487/// 7488/// \returns true if the new tag kind is acceptable, false otherwise. 7489bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7490 TagTypeKind NewTag, bool isDefinition, 7491 SourceLocation NewTagLoc, 7492 const IdentifierInfo &Name) { 7493 // C++ [dcl.type.elab]p3: 7494 // The class-key or enum keyword present in the 7495 // elaborated-type-specifier shall agree in kind with the 7496 // declaration to which the name in the elaborated-type-specifier 7497 // refers. This rule also applies to the form of 7498 // elaborated-type-specifier that declares a class-name or 7499 // friend class since it can be construed as referring to the 7500 // definition of the class. Thus, in any 7501 // elaborated-type-specifier, the enum keyword shall be used to 7502 // refer to an enumeration (7.2), the union class-key shall be 7503 // used to refer to a union (clause 9), and either the class or 7504 // struct class-key shall be used to refer to a class (clause 9) 7505 // declared using the class or struct class-key. 7506 TagTypeKind OldTag = Previous->getTagKind(); 7507 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7508 if (OldTag == NewTag) 7509 return true; 7510 7511 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7512 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7513 // Warn about the struct/class tag mismatch. 7514 bool isTemplate = false; 7515 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7516 isTemplate = Record->getDescribedClassTemplate(); 7517 7518 if (!ActiveTemplateInstantiations.empty()) { 7519 // In a template instantiation, do not offer fix-its for tag mismatches 7520 // since they usually mess up the template instead of fixing the problem. 7521 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7522 << (NewTag == TTK_Class) << isTemplate << &Name; 7523 return true; 7524 } 7525 7526 if (isDefinition) { 7527 // On definitions, check previous tags and issue a fix-it for each 7528 // one that doesn't match the current tag. 7529 if (Previous->getDefinition()) { 7530 // Don't suggest fix-its for redefinitions. 7531 return true; 7532 } 7533 7534 bool previousMismatch = false; 7535 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7536 E(Previous->redecls_end()); I != E; ++I) { 7537 if (I->getTagKind() != NewTag) { 7538 if (!previousMismatch) { 7539 previousMismatch = true; 7540 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7541 << (NewTag == TTK_Class) << isTemplate << &Name; 7542 } 7543 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7544 << (NewTag == TTK_Class) 7545 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7546 NewTag == TTK_Class? 7547 "class" : "struct"); 7548 } 7549 } 7550 return true; 7551 } 7552 7553 // Check for a previous definition. If current tag and definition 7554 // are same type, do nothing. If no definition, but disagree with 7555 // with previous tag type, give a warning, but no fix-it. 7556 const TagDecl *Redecl = Previous->getDefinition() ? 7557 Previous->getDefinition() : Previous; 7558 if (Redecl->getTagKind() == NewTag) { 7559 return true; 7560 } 7561 7562 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7563 << (NewTag == TTK_Class) 7564 << isTemplate << &Name; 7565 Diag(Redecl->getLocation(), diag::note_previous_use); 7566 7567 // If there is a previous defintion, suggest a fix-it. 7568 if (Previous->getDefinition()) { 7569 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7570 << (Redecl->getTagKind() == TTK_Class) 7571 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7572 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7573 } 7574 7575 return true; 7576 } 7577 return false; 7578} 7579 7580/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7581/// former case, Name will be non-null. In the later case, Name will be null. 7582/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7583/// reference/declaration/definition of a tag. 7584Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7585 SourceLocation KWLoc, CXXScopeSpec &SS, 7586 IdentifierInfo *Name, SourceLocation NameLoc, 7587 AttributeList *Attr, AccessSpecifier AS, 7588 SourceLocation ModulePrivateLoc, 7589 MultiTemplateParamsArg TemplateParameterLists, 7590 bool &OwnedDecl, bool &IsDependent, 7591 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7592 TypeResult UnderlyingType) { 7593 // If this is not a definition, it must have a name. 7594 assert((Name != 0 || TUK == TUK_Definition) && 7595 "Nameless record must be a definition!"); 7596 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7597 7598 OwnedDecl = false; 7599 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7600 7601 // FIXME: Check explicit specializations more carefully. 7602 bool isExplicitSpecialization = false; 7603 bool Invalid = false; 7604 7605 // We only need to do this matching if we have template parameters 7606 // or a scope specifier, which also conveniently avoids this work 7607 // for non-C++ cases. 7608 if (TemplateParameterLists.size() > 0 || 7609 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7610 if (TemplateParameterList *TemplateParams 7611 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7612 TemplateParameterLists.get(), 7613 TemplateParameterLists.size(), 7614 TUK == TUK_Friend, 7615 isExplicitSpecialization, 7616 Invalid)) { 7617 if (TemplateParams->size() > 0) { 7618 // This is a declaration or definition of a class template (which may 7619 // be a member of another template). 7620 7621 if (Invalid) 7622 return 0; 7623 7624 OwnedDecl = false; 7625 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7626 SS, Name, NameLoc, Attr, 7627 TemplateParams, AS, 7628 ModulePrivateLoc, 7629 TemplateParameterLists.size() - 1, 7630 (TemplateParameterList**) TemplateParameterLists.release()); 7631 return Result.get(); 7632 } else { 7633 // The "template<>" header is extraneous. 7634 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7635 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7636 isExplicitSpecialization = true; 7637 } 7638 } 7639 } 7640 7641 // Figure out the underlying type if this a enum declaration. We need to do 7642 // this early, because it's needed to detect if this is an incompatible 7643 // redeclaration. 7644 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7645 7646 if (Kind == TTK_Enum) { 7647 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7648 // No underlying type explicitly specified, or we failed to parse the 7649 // type, default to int. 7650 EnumUnderlying = Context.IntTy.getTypePtr(); 7651 else if (UnderlyingType.get()) { 7652 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7653 // integral type; any cv-qualification is ignored. 7654 TypeSourceInfo *TI = 0; 7655 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7656 EnumUnderlying = TI; 7657 7658 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7659 7660 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7661 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7662 << T; 7663 // Recover by falling back to int. 7664 EnumUnderlying = Context.IntTy.getTypePtr(); 7665 } 7666 7667 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7668 UPPC_FixedUnderlyingType)) 7669 EnumUnderlying = Context.IntTy.getTypePtr(); 7670 7671 } else if (getLangOptions().MicrosoftExt) 7672 // Microsoft enums are always of int type. 7673 EnumUnderlying = Context.IntTy.getTypePtr(); 7674 } 7675 7676 DeclContext *SearchDC = CurContext; 7677 DeclContext *DC = CurContext; 7678 bool isStdBadAlloc = false; 7679 7680 RedeclarationKind Redecl = ForRedeclaration; 7681 if (TUK == TUK_Friend || TUK == TUK_Reference) 7682 Redecl = NotForRedeclaration; 7683 7684 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7685 7686 if (Name && SS.isNotEmpty()) { 7687 // We have a nested-name tag ('struct foo::bar'). 7688 7689 // Check for invalid 'foo::'. 7690 if (SS.isInvalid()) { 7691 Name = 0; 7692 goto CreateNewDecl; 7693 } 7694 7695 // If this is a friend or a reference to a class in a dependent 7696 // context, don't try to make a decl for it. 7697 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7698 DC = computeDeclContext(SS, false); 7699 if (!DC) { 7700 IsDependent = true; 7701 return 0; 7702 } 7703 } else { 7704 DC = computeDeclContext(SS, true); 7705 if (!DC) { 7706 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7707 << SS.getRange(); 7708 return 0; 7709 } 7710 } 7711 7712 if (RequireCompleteDeclContext(SS, DC)) 7713 return 0; 7714 7715 SearchDC = DC; 7716 // Look-up name inside 'foo::'. 7717 LookupQualifiedName(Previous, DC); 7718 7719 if (Previous.isAmbiguous()) 7720 return 0; 7721 7722 if (Previous.empty()) { 7723 // Name lookup did not find anything. However, if the 7724 // nested-name-specifier refers to the current instantiation, 7725 // and that current instantiation has any dependent base 7726 // classes, we might find something at instantiation time: treat 7727 // this as a dependent elaborated-type-specifier. 7728 // But this only makes any sense for reference-like lookups. 7729 if (Previous.wasNotFoundInCurrentInstantiation() && 7730 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7731 IsDependent = true; 7732 return 0; 7733 } 7734 7735 // A tag 'foo::bar' must already exist. 7736 Diag(NameLoc, diag::err_not_tag_in_scope) 7737 << Kind << Name << DC << SS.getRange(); 7738 Name = 0; 7739 Invalid = true; 7740 goto CreateNewDecl; 7741 } 7742 } else if (Name) { 7743 // If this is a named struct, check to see if there was a previous forward 7744 // declaration or definition. 7745 // FIXME: We're looking into outer scopes here, even when we 7746 // shouldn't be. Doing so can result in ambiguities that we 7747 // shouldn't be diagnosing. 7748 LookupName(Previous, S); 7749 7750 if (Previous.isAmbiguous() && 7751 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7752 LookupResult::Filter F = Previous.makeFilter(); 7753 while (F.hasNext()) { 7754 NamedDecl *ND = F.next(); 7755 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7756 F.erase(); 7757 } 7758 F.done(); 7759 } 7760 7761 // Note: there used to be some attempt at recovery here. 7762 if (Previous.isAmbiguous()) 7763 return 0; 7764 7765 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7766 // FIXME: This makes sure that we ignore the contexts associated 7767 // with C structs, unions, and enums when looking for a matching 7768 // tag declaration or definition. See the similar lookup tweak 7769 // in Sema::LookupName; is there a better way to deal with this? 7770 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7771 SearchDC = SearchDC->getParent(); 7772 } 7773 } else if (S->isFunctionPrototypeScope()) { 7774 // If this is an enum declaration in function prototype scope, set its 7775 // initial context to the translation unit. 7776 SearchDC = Context.getTranslationUnitDecl(); 7777 } 7778 7779 if (Previous.isSingleResult() && 7780 Previous.getFoundDecl()->isTemplateParameter()) { 7781 // Maybe we will complain about the shadowed template parameter. 7782 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7783 // Just pretend that we didn't see the previous declaration. 7784 Previous.clear(); 7785 } 7786 7787 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7788 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7789 // This is a declaration of or a reference to "std::bad_alloc". 7790 isStdBadAlloc = true; 7791 7792 if (Previous.empty() && StdBadAlloc) { 7793 // std::bad_alloc has been implicitly declared (but made invisible to 7794 // name lookup). Fill in this implicit declaration as the previous 7795 // declaration, so that the declarations get chained appropriately. 7796 Previous.addDecl(getStdBadAlloc()); 7797 } 7798 } 7799 7800 // If we didn't find a previous declaration, and this is a reference 7801 // (or friend reference), move to the correct scope. In C++, we 7802 // also need to do a redeclaration lookup there, just in case 7803 // there's a shadow friend decl. 7804 if (Name && Previous.empty() && 7805 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7806 if (Invalid) goto CreateNewDecl; 7807 assert(SS.isEmpty()); 7808 7809 if (TUK == TUK_Reference) { 7810 // C++ [basic.scope.pdecl]p5: 7811 // -- for an elaborated-type-specifier of the form 7812 // 7813 // class-key identifier 7814 // 7815 // if the elaborated-type-specifier is used in the 7816 // decl-specifier-seq or parameter-declaration-clause of a 7817 // function defined in namespace scope, the identifier is 7818 // declared as a class-name in the namespace that contains 7819 // the declaration; otherwise, except as a friend 7820 // declaration, the identifier is declared in the smallest 7821 // non-class, non-function-prototype scope that contains the 7822 // declaration. 7823 // 7824 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7825 // C structs and unions. 7826 // 7827 // It is an error in C++ to declare (rather than define) an enum 7828 // type, including via an elaborated type specifier. We'll 7829 // diagnose that later; for now, declare the enum in the same 7830 // scope as we would have picked for any other tag type. 7831 // 7832 // GNU C also supports this behavior as part of its incomplete 7833 // enum types extension, while GNU C++ does not. 7834 // 7835 // Find the context where we'll be declaring the tag. 7836 // FIXME: We would like to maintain the current DeclContext as the 7837 // lexical context, 7838 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7839 SearchDC = SearchDC->getParent(); 7840 7841 // Find the scope where we'll be declaring the tag. 7842 while (S->isClassScope() || 7843 (getLangOptions().CPlusPlus && 7844 S->isFunctionPrototypeScope()) || 7845 ((S->getFlags() & Scope::DeclScope) == 0) || 7846 (S->getEntity() && 7847 ((DeclContext *)S->getEntity())->isTransparentContext())) 7848 S = S->getParent(); 7849 } else { 7850 assert(TUK == TUK_Friend); 7851 // C++ [namespace.memdef]p3: 7852 // If a friend declaration in a non-local class first declares a 7853 // class or function, the friend class or function is a member of 7854 // the innermost enclosing namespace. 7855 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7856 } 7857 7858 // In C++, we need to do a redeclaration lookup to properly 7859 // diagnose some problems. 7860 if (getLangOptions().CPlusPlus) { 7861 Previous.setRedeclarationKind(ForRedeclaration); 7862 LookupQualifiedName(Previous, SearchDC); 7863 } 7864 } 7865 7866 if (!Previous.empty()) { 7867 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7868 7869 // It's okay to have a tag decl in the same scope as a typedef 7870 // which hides a tag decl in the same scope. Finding this 7871 // insanity with a redeclaration lookup can only actually happen 7872 // in C++. 7873 // 7874 // This is also okay for elaborated-type-specifiers, which is 7875 // technically forbidden by the current standard but which is 7876 // okay according to the likely resolution of an open issue; 7877 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7878 if (getLangOptions().CPlusPlus) { 7879 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7880 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7881 TagDecl *Tag = TT->getDecl(); 7882 if (Tag->getDeclName() == Name && 7883 Tag->getDeclContext()->getRedeclContext() 7884 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7885 PrevDecl = Tag; 7886 Previous.clear(); 7887 Previous.addDecl(Tag); 7888 Previous.resolveKind(); 7889 } 7890 } 7891 } 7892 } 7893 7894 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7895 // If this is a use of a previous tag, or if the tag is already declared 7896 // in the same scope (so that the definition/declaration completes or 7897 // rementions the tag), reuse the decl. 7898 if (TUK == TUK_Reference || TUK == TUK_Friend || 7899 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7900 // Make sure that this wasn't declared as an enum and now used as a 7901 // struct or something similar. 7902 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7903 TUK == TUK_Definition, KWLoc, 7904 *Name)) { 7905 bool SafeToContinue 7906 = (PrevTagDecl->getTagKind() != TTK_Enum && 7907 Kind != TTK_Enum); 7908 if (SafeToContinue) 7909 Diag(KWLoc, diag::err_use_with_wrong_tag) 7910 << Name 7911 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7912 PrevTagDecl->getKindName()); 7913 else 7914 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7915 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7916 7917 if (SafeToContinue) 7918 Kind = PrevTagDecl->getTagKind(); 7919 else { 7920 // Recover by making this an anonymous redefinition. 7921 Name = 0; 7922 Previous.clear(); 7923 Invalid = true; 7924 } 7925 } 7926 7927 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7928 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7929 7930 // All conflicts with previous declarations are recovered by 7931 // returning the previous declaration. 7932 if (ScopedEnum != PrevEnum->isScoped()) { 7933 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7934 << PrevEnum->isScoped(); 7935 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7936 return PrevTagDecl; 7937 } 7938 else if (EnumUnderlying && PrevEnum->isFixed()) { 7939 QualType T; 7940 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7941 T = TI->getType(); 7942 else 7943 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7944 7945 if (!Context.hasSameUnqualifiedType(T, 7946 PrevEnum->getIntegerType())) { 7947 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7948 diag::err_enum_redeclare_type_mismatch) 7949 << T 7950 << PrevEnum->getIntegerType(); 7951 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7952 return PrevTagDecl; 7953 } 7954 } 7955 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7956 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7957 << PrevEnum->isFixed(); 7958 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7959 return PrevTagDecl; 7960 } 7961 } 7962 7963 if (!Invalid) { 7964 // If this is a use, just return the declaration we found. 7965 7966 // FIXME: In the future, return a variant or some other clue 7967 // for the consumer of this Decl to know it doesn't own it. 7968 // For our current ASTs this shouldn't be a problem, but will 7969 // need to be changed with DeclGroups. 7970 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7971 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7972 return PrevTagDecl; 7973 7974 // Diagnose attempts to redefine a tag. 7975 if (TUK == TUK_Definition) { 7976 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7977 // If we're defining a specialization and the previous definition 7978 // is from an implicit instantiation, don't emit an error 7979 // here; we'll catch this in the general case below. 7980 if (!isExplicitSpecialization || 7981 !isa<CXXRecordDecl>(Def) || 7982 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7983 == TSK_ExplicitSpecialization) { 7984 Diag(NameLoc, diag::err_redefinition) << Name; 7985 Diag(Def->getLocation(), diag::note_previous_definition); 7986 // If this is a redefinition, recover by making this 7987 // struct be anonymous, which will make any later 7988 // references get the previous definition. 7989 Name = 0; 7990 Previous.clear(); 7991 Invalid = true; 7992 } 7993 } else { 7994 // If the type is currently being defined, complain 7995 // about a nested redefinition. 7996 const TagType *Tag 7997 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7998 if (Tag->isBeingDefined()) { 7999 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8000 Diag(PrevTagDecl->getLocation(), 8001 diag::note_previous_definition); 8002 Name = 0; 8003 Previous.clear(); 8004 Invalid = true; 8005 } 8006 } 8007 8008 // Okay, this is definition of a previously declared or referenced 8009 // tag PrevDecl. We're going to create a new Decl for it. 8010 } 8011 } 8012 // If we get here we have (another) forward declaration or we 8013 // have a definition. Just create a new decl. 8014 8015 } else { 8016 // If we get here, this is a definition of a new tag type in a nested 8017 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8018 // new decl/type. We set PrevDecl to NULL so that the entities 8019 // have distinct types. 8020 Previous.clear(); 8021 } 8022 // If we get here, we're going to create a new Decl. If PrevDecl 8023 // is non-NULL, it's a definition of the tag declared by 8024 // PrevDecl. If it's NULL, we have a new definition. 8025 8026 8027 // Otherwise, PrevDecl is not a tag, but was found with tag 8028 // lookup. This is only actually possible in C++, where a few 8029 // things like templates still live in the tag namespace. 8030 } else { 8031 assert(getLangOptions().CPlusPlus); 8032 8033 // Use a better diagnostic if an elaborated-type-specifier 8034 // found the wrong kind of type on the first 8035 // (non-redeclaration) lookup. 8036 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8037 !Previous.isForRedeclaration()) { 8038 unsigned Kind = 0; 8039 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8040 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8041 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8042 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8043 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8044 Invalid = true; 8045 8046 // Otherwise, only diagnose if the declaration is in scope. 8047 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8048 isExplicitSpecialization)) { 8049 // do nothing 8050 8051 // Diagnose implicit declarations introduced by elaborated types. 8052 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8053 unsigned Kind = 0; 8054 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8055 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8056 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8057 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8058 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8059 Invalid = true; 8060 8061 // Otherwise it's a declaration. Call out a particularly common 8062 // case here. 8063 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8064 unsigned Kind = 0; 8065 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8066 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8067 << Name << Kind << TND->getUnderlyingType(); 8068 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8069 Invalid = true; 8070 8071 // Otherwise, diagnose. 8072 } else { 8073 // The tag name clashes with something else in the target scope, 8074 // issue an error and recover by making this tag be anonymous. 8075 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8076 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8077 Name = 0; 8078 Invalid = true; 8079 } 8080 8081 // The existing declaration isn't relevant to us; we're in a 8082 // new scope, so clear out the previous declaration. 8083 Previous.clear(); 8084 } 8085 } 8086 8087CreateNewDecl: 8088 8089 TagDecl *PrevDecl = 0; 8090 if (Previous.isSingleResult()) 8091 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8092 8093 // If there is an identifier, use the location of the identifier as the 8094 // location of the decl, otherwise use the location of the struct/union 8095 // keyword. 8096 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8097 8098 // Otherwise, create a new declaration. If there is a previous 8099 // declaration of the same entity, the two will be linked via 8100 // PrevDecl. 8101 TagDecl *New; 8102 8103 bool IsForwardReference = false; 8104 if (Kind == TTK_Enum) { 8105 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8106 // enum X { A, B, C } D; D should chain to X. 8107 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8108 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8109 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8110 // If this is an undefined enum, warn. 8111 if (TUK != TUK_Definition && !Invalid) { 8112 TagDecl *Def; 8113 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8114 // C++0x: 7.2p2: opaque-enum-declaration. 8115 // Conflicts are diagnosed above. Do nothing. 8116 } 8117 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8118 Diag(Loc, diag::ext_forward_ref_enum_def) 8119 << New; 8120 Diag(Def->getLocation(), diag::note_previous_definition); 8121 } else { 8122 unsigned DiagID = diag::ext_forward_ref_enum; 8123 if (getLangOptions().MicrosoftExt) 8124 DiagID = diag::ext_ms_forward_ref_enum; 8125 else if (getLangOptions().CPlusPlus) 8126 DiagID = diag::err_forward_ref_enum; 8127 Diag(Loc, DiagID); 8128 8129 // If this is a forward-declared reference to an enumeration, make a 8130 // note of it; we won't actually be introducing the declaration into 8131 // the declaration context. 8132 if (TUK == TUK_Reference) 8133 IsForwardReference = true; 8134 } 8135 } 8136 8137 if (EnumUnderlying) { 8138 EnumDecl *ED = cast<EnumDecl>(New); 8139 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8140 ED->setIntegerTypeSourceInfo(TI); 8141 else 8142 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8143 ED->setPromotionType(ED->getIntegerType()); 8144 } 8145 8146 } else { 8147 // struct/union/class 8148 8149 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8150 // struct X { int A; } D; D should chain to X. 8151 if (getLangOptions().CPlusPlus) { 8152 // FIXME: Look for a way to use RecordDecl for simple structs. 8153 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8154 cast_or_null<CXXRecordDecl>(PrevDecl)); 8155 8156 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8157 StdBadAlloc = cast<CXXRecordDecl>(New); 8158 } else 8159 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8160 cast_or_null<RecordDecl>(PrevDecl)); 8161 } 8162 8163 // Maybe add qualifier info. 8164 if (SS.isNotEmpty()) { 8165 if (SS.isSet()) { 8166 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8167 if (TemplateParameterLists.size() > 0) { 8168 New->setTemplateParameterListsInfo(Context, 8169 TemplateParameterLists.size(), 8170 (TemplateParameterList**) TemplateParameterLists.release()); 8171 } 8172 } 8173 else 8174 Invalid = true; 8175 } 8176 8177 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8178 // Add alignment attributes if necessary; these attributes are checked when 8179 // the ASTContext lays out the structure. 8180 // 8181 // It is important for implementing the correct semantics that this 8182 // happen here (in act on tag decl). The #pragma pack stack is 8183 // maintained as a result of parser callbacks which can occur at 8184 // many points during the parsing of a struct declaration (because 8185 // the #pragma tokens are effectively skipped over during the 8186 // parsing of the struct). 8187 AddAlignmentAttributesForRecord(RD); 8188 8189 AddMsStructLayoutForRecord(RD); 8190 } 8191 8192 if (ModulePrivateLoc.isValid()) { 8193 if (isExplicitSpecialization) 8194 Diag(New->getLocation(), diag::err_module_private_specialization) 8195 << 2 8196 << FixItHint::CreateRemoval(ModulePrivateLoc); 8197 // __module_private__ does not apply to local classes. However, we only 8198 // diagnose this as an error when the declaration specifiers are 8199 // freestanding. Here, we just ignore the __module_private__. 8200 else if (!SearchDC->isFunctionOrMethod()) 8201 New->setModulePrivate(); 8202 } 8203 8204 // If this is a specialization of a member class (of a class template), 8205 // check the specialization. 8206 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8207 Invalid = true; 8208 8209 if (Invalid) 8210 New->setInvalidDecl(); 8211 8212 if (Attr) 8213 ProcessDeclAttributeList(S, New, Attr); 8214 8215 // If we're declaring or defining a tag in function prototype scope 8216 // in C, note that this type can only be used within the function. 8217 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8218 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8219 8220 // Set the lexical context. If the tag has a C++ scope specifier, the 8221 // lexical context will be different from the semantic context. 8222 New->setLexicalDeclContext(CurContext); 8223 8224 // Mark this as a friend decl if applicable. 8225 // In Microsoft mode, a friend declaration also acts as a forward 8226 // declaration so we always pass true to setObjectOfFriendDecl to make 8227 // the tag name visible. 8228 if (TUK == TUK_Friend) 8229 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8230 getLangOptions().MicrosoftExt); 8231 8232 // Set the access specifier. 8233 if (!Invalid && SearchDC->isRecord()) 8234 SetMemberAccessSpecifier(New, PrevDecl, AS); 8235 8236 if (TUK == TUK_Definition) 8237 New->startDefinition(); 8238 8239 // If this has an identifier, add it to the scope stack. 8240 if (TUK == TUK_Friend) { 8241 // We might be replacing an existing declaration in the lookup tables; 8242 // if so, borrow its access specifier. 8243 if (PrevDecl) 8244 New->setAccess(PrevDecl->getAccess()); 8245 8246 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8247 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8248 if (Name) // can be null along some error paths 8249 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8250 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8251 } else if (Name) { 8252 S = getNonFieldDeclScope(S); 8253 PushOnScopeChains(New, S, !IsForwardReference); 8254 if (IsForwardReference) 8255 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8256 8257 } else { 8258 CurContext->addDecl(New); 8259 } 8260 8261 // If this is the C FILE type, notify the AST context. 8262 if (IdentifierInfo *II = New->getIdentifier()) 8263 if (!New->isInvalidDecl() && 8264 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8265 II->isStr("FILE")) 8266 Context.setFILEDecl(New); 8267 8268 OwnedDecl = true; 8269 return New; 8270} 8271 8272void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8273 AdjustDeclIfTemplate(TagD); 8274 TagDecl *Tag = cast<TagDecl>(TagD); 8275 8276 // Enter the tag context. 8277 PushDeclContext(S, Tag); 8278} 8279 8280Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8281 assert(isa<ObjCContainerDecl>(IDecl) && 8282 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8283 DeclContext *OCD = cast<DeclContext>(IDecl); 8284 assert(getContainingDC(OCD) == CurContext && 8285 "The next DeclContext should be lexically contained in the current one."); 8286 CurContext = OCD; 8287 return IDecl; 8288} 8289 8290void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8291 SourceLocation FinalLoc, 8292 SourceLocation LBraceLoc) { 8293 AdjustDeclIfTemplate(TagD); 8294 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8295 8296 FieldCollector->StartClass(); 8297 8298 if (!Record->getIdentifier()) 8299 return; 8300 8301 if (FinalLoc.isValid()) 8302 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8303 8304 // C++ [class]p2: 8305 // [...] The class-name is also inserted into the scope of the 8306 // class itself; this is known as the injected-class-name. For 8307 // purposes of access checking, the injected-class-name is treated 8308 // as if it were a public member name. 8309 CXXRecordDecl *InjectedClassName 8310 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8311 Record->getLocStart(), Record->getLocation(), 8312 Record->getIdentifier(), 8313 /*PrevDecl=*/0, 8314 /*DelayTypeCreation=*/true); 8315 Context.getTypeDeclType(InjectedClassName, Record); 8316 InjectedClassName->setImplicit(); 8317 InjectedClassName->setAccess(AS_public); 8318 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8319 InjectedClassName->setDescribedClassTemplate(Template); 8320 PushOnScopeChains(InjectedClassName, S); 8321 assert(InjectedClassName->isInjectedClassName() && 8322 "Broken injected-class-name"); 8323} 8324 8325void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8326 SourceLocation RBraceLoc) { 8327 AdjustDeclIfTemplate(TagD); 8328 TagDecl *Tag = cast<TagDecl>(TagD); 8329 Tag->setRBraceLoc(RBraceLoc); 8330 8331 if (isa<CXXRecordDecl>(Tag)) 8332 FieldCollector->FinishClass(); 8333 8334 // Exit this scope of this tag's definition. 8335 PopDeclContext(); 8336 8337 // Notify the consumer that we've defined a tag. 8338 Consumer.HandleTagDeclDefinition(Tag); 8339} 8340 8341void Sema::ActOnObjCContainerFinishDefinition() { 8342 // Exit this scope of this interface definition. 8343 PopDeclContext(); 8344} 8345 8346void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8347 assert(DC == CurContext && "Mismatch of container contexts"); 8348 OriginalLexicalContext = DC; 8349 ActOnObjCContainerFinishDefinition(); 8350} 8351 8352void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8353 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8354 OriginalLexicalContext = 0; 8355} 8356 8357void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8358 AdjustDeclIfTemplate(TagD); 8359 TagDecl *Tag = cast<TagDecl>(TagD); 8360 Tag->setInvalidDecl(); 8361 8362 // We're undoing ActOnTagStartDefinition here, not 8363 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8364 // the FieldCollector. 8365 8366 PopDeclContext(); 8367} 8368 8369// Note that FieldName may be null for anonymous bitfields. 8370bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8371 QualType FieldTy, const Expr *BitWidth, 8372 bool *ZeroWidth) { 8373 // Default to true; that shouldn't confuse checks for emptiness 8374 if (ZeroWidth) 8375 *ZeroWidth = true; 8376 8377 // C99 6.7.2.1p4 - verify the field type. 8378 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8379 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8380 // Handle incomplete types with specific error. 8381 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8382 return true; 8383 if (FieldName) 8384 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8385 << FieldName << FieldTy << BitWidth->getSourceRange(); 8386 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8387 << FieldTy << BitWidth->getSourceRange(); 8388 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8389 UPPC_BitFieldWidth)) 8390 return true; 8391 8392 // If the bit-width is type- or value-dependent, don't try to check 8393 // it now. 8394 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8395 return false; 8396 8397 llvm::APSInt Value; 8398 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8399 return true; 8400 8401 if (Value != 0 && ZeroWidth) 8402 *ZeroWidth = false; 8403 8404 // Zero-width bitfield is ok for anonymous field. 8405 if (Value == 0 && FieldName) 8406 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8407 8408 if (Value.isSigned() && Value.isNegative()) { 8409 if (FieldName) 8410 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8411 << FieldName << Value.toString(10); 8412 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8413 << Value.toString(10); 8414 } 8415 8416 if (!FieldTy->isDependentType()) { 8417 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8418 if (Value.getZExtValue() > TypeSize) { 8419 if (!getLangOptions().CPlusPlus) { 8420 if (FieldName) 8421 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8422 << FieldName << (unsigned)Value.getZExtValue() 8423 << (unsigned)TypeSize; 8424 8425 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8426 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8427 } 8428 8429 if (FieldName) 8430 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8431 << FieldName << (unsigned)Value.getZExtValue() 8432 << (unsigned)TypeSize; 8433 else 8434 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8435 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8436 } 8437 } 8438 8439 return false; 8440} 8441 8442/// ActOnField - Each field of a C struct/union is passed into this in order 8443/// to create a FieldDecl object for it. 8444Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8445 Declarator &D, Expr *BitfieldWidth) { 8446 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8447 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8448 /*HasInit=*/false, AS_public); 8449 return Res; 8450} 8451 8452/// HandleField - Analyze a field of a C struct or a C++ data member. 8453/// 8454FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8455 SourceLocation DeclStart, 8456 Declarator &D, Expr *BitWidth, bool HasInit, 8457 AccessSpecifier AS) { 8458 IdentifierInfo *II = D.getIdentifier(); 8459 SourceLocation Loc = DeclStart; 8460 if (II) Loc = D.getIdentifierLoc(); 8461 8462 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8463 QualType T = TInfo->getType(); 8464 if (getLangOptions().CPlusPlus) { 8465 CheckExtraCXXDefaultArguments(D); 8466 8467 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8468 UPPC_DataMemberType)) { 8469 D.setInvalidType(); 8470 T = Context.IntTy; 8471 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8472 } 8473 } 8474 8475 DiagnoseFunctionSpecifiers(D); 8476 8477 if (D.getDeclSpec().isThreadSpecified()) 8478 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8479 if (D.getDeclSpec().isConstexprSpecified()) 8480 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8481 << 2; 8482 8483 // Check to see if this name was declared as a member previously 8484 NamedDecl *PrevDecl = 0; 8485 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8486 LookupName(Previous, S); 8487 switch (Previous.getResultKind()) { 8488 case LookupResult::Found: 8489 case LookupResult::FoundUnresolvedValue: 8490 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8491 break; 8492 8493 case LookupResult::FoundOverloaded: 8494 PrevDecl = Previous.getRepresentativeDecl(); 8495 break; 8496 8497 case LookupResult::NotFound: 8498 case LookupResult::NotFoundInCurrentInstantiation: 8499 case LookupResult::Ambiguous: 8500 break; 8501 } 8502 Previous.suppressDiagnostics(); 8503 8504 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8505 // Maybe we will complain about the shadowed template parameter. 8506 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8507 // Just pretend that we didn't see the previous declaration. 8508 PrevDecl = 0; 8509 } 8510 8511 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8512 PrevDecl = 0; 8513 8514 bool Mutable 8515 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8516 SourceLocation TSSL = D.getSourceRange().getBegin(); 8517 FieldDecl *NewFD 8518 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8519 TSSL, AS, PrevDecl, &D); 8520 8521 if (NewFD->isInvalidDecl()) 8522 Record->setInvalidDecl(); 8523 8524 if (D.getDeclSpec().isModulePrivateSpecified()) 8525 NewFD->setModulePrivate(); 8526 8527 if (NewFD->isInvalidDecl() && PrevDecl) { 8528 // Don't introduce NewFD into scope; there's already something 8529 // with the same name in the same scope. 8530 } else if (II) { 8531 PushOnScopeChains(NewFD, S); 8532 } else 8533 Record->addDecl(NewFD); 8534 8535 return NewFD; 8536} 8537 8538/// \brief Build a new FieldDecl and check its well-formedness. 8539/// 8540/// This routine builds a new FieldDecl given the fields name, type, 8541/// record, etc. \p PrevDecl should refer to any previous declaration 8542/// with the same name and in the same scope as the field to be 8543/// created. 8544/// 8545/// \returns a new FieldDecl. 8546/// 8547/// \todo The Declarator argument is a hack. It will be removed once 8548FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8549 TypeSourceInfo *TInfo, 8550 RecordDecl *Record, SourceLocation Loc, 8551 bool Mutable, Expr *BitWidth, bool HasInit, 8552 SourceLocation TSSL, 8553 AccessSpecifier AS, NamedDecl *PrevDecl, 8554 Declarator *D) { 8555 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8556 bool InvalidDecl = false; 8557 if (D) InvalidDecl = D->isInvalidType(); 8558 8559 // If we receive a broken type, recover by assuming 'int' and 8560 // marking this declaration as invalid. 8561 if (T.isNull()) { 8562 InvalidDecl = true; 8563 T = Context.IntTy; 8564 } 8565 8566 QualType EltTy = Context.getBaseElementType(T); 8567 if (!EltTy->isDependentType() && 8568 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8569 // Fields of incomplete type force their record to be invalid. 8570 Record->setInvalidDecl(); 8571 InvalidDecl = true; 8572 } 8573 8574 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8575 // than a variably modified type. 8576 if (!InvalidDecl && T->isVariablyModifiedType()) { 8577 bool SizeIsNegative; 8578 llvm::APSInt Oversized; 8579 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8580 SizeIsNegative, 8581 Oversized); 8582 if (!FixedTy.isNull()) { 8583 Diag(Loc, diag::warn_illegal_constant_array_size); 8584 T = FixedTy; 8585 } else { 8586 if (SizeIsNegative) 8587 Diag(Loc, diag::err_typecheck_negative_array_size); 8588 else if (Oversized.getBoolValue()) 8589 Diag(Loc, diag::err_array_too_large) 8590 << Oversized.toString(10); 8591 else 8592 Diag(Loc, diag::err_typecheck_field_variable_size); 8593 InvalidDecl = true; 8594 } 8595 } 8596 8597 // Fields can not have abstract class types 8598 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8599 diag::err_abstract_type_in_decl, 8600 AbstractFieldType)) 8601 InvalidDecl = true; 8602 8603 bool ZeroWidth = false; 8604 // If this is declared as a bit-field, check the bit-field. 8605 if (!InvalidDecl && BitWidth && 8606 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8607 InvalidDecl = true; 8608 BitWidth = 0; 8609 ZeroWidth = false; 8610 } 8611 8612 // Check that 'mutable' is consistent with the type of the declaration. 8613 if (!InvalidDecl && Mutable) { 8614 unsigned DiagID = 0; 8615 if (T->isReferenceType()) 8616 DiagID = diag::err_mutable_reference; 8617 else if (T.isConstQualified()) 8618 DiagID = diag::err_mutable_const; 8619 8620 if (DiagID) { 8621 SourceLocation ErrLoc = Loc; 8622 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8623 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8624 Diag(ErrLoc, DiagID); 8625 Mutable = false; 8626 InvalidDecl = true; 8627 } 8628 } 8629 8630 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8631 BitWidth, Mutable, HasInit); 8632 if (InvalidDecl) 8633 NewFD->setInvalidDecl(); 8634 8635 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8636 Diag(Loc, diag::err_duplicate_member) << II; 8637 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8638 NewFD->setInvalidDecl(); 8639 } 8640 8641 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8642 if (Record->isUnion()) { 8643 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8644 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8645 if (RDecl->getDefinition()) { 8646 // C++ [class.union]p1: An object of a class with a non-trivial 8647 // constructor, a non-trivial copy constructor, a non-trivial 8648 // destructor, or a non-trivial copy assignment operator 8649 // cannot be a member of a union, nor can an array of such 8650 // objects. 8651 if (CheckNontrivialField(NewFD)) 8652 NewFD->setInvalidDecl(); 8653 } 8654 } 8655 8656 // C++ [class.union]p1: If a union contains a member of reference type, 8657 // the program is ill-formed. 8658 if (EltTy->isReferenceType()) { 8659 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8660 << NewFD->getDeclName() << EltTy; 8661 NewFD->setInvalidDecl(); 8662 } 8663 } 8664 } 8665 8666 // FIXME: We need to pass in the attributes given an AST 8667 // representation, not a parser representation. 8668 if (D) 8669 // FIXME: What to pass instead of TUScope? 8670 ProcessDeclAttributes(TUScope, NewFD, *D); 8671 8672 // In auto-retain/release, infer strong retension for fields of 8673 // retainable type. 8674 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8675 NewFD->setInvalidDecl(); 8676 8677 if (T.isObjCGCWeak()) 8678 Diag(Loc, diag::warn_attribute_weak_on_field); 8679 8680 NewFD->setAccess(AS); 8681 return NewFD; 8682} 8683 8684bool Sema::CheckNontrivialField(FieldDecl *FD) { 8685 assert(FD); 8686 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8687 8688 if (FD->isInvalidDecl()) 8689 return true; 8690 8691 QualType EltTy = Context.getBaseElementType(FD->getType()); 8692 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8693 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8694 if (RDecl->getDefinition()) { 8695 // We check for copy constructors before constructors 8696 // because otherwise we'll never get complaints about 8697 // copy constructors. 8698 8699 CXXSpecialMember member = CXXInvalid; 8700 if (!RDecl->hasTrivialCopyConstructor()) 8701 member = CXXCopyConstructor; 8702 else if (!RDecl->hasTrivialDefaultConstructor()) 8703 member = CXXDefaultConstructor; 8704 else if (!RDecl->hasTrivialCopyAssignment()) 8705 member = CXXCopyAssignment; 8706 else if (!RDecl->hasTrivialDestructor()) 8707 member = CXXDestructor; 8708 8709 if (member != CXXInvalid) { 8710 if (!getLangOptions().CPlusPlus0x && 8711 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8712 // Objective-C++ ARC: it is an error to have a non-trivial field of 8713 // a union. However, system headers in Objective-C programs 8714 // occasionally have Objective-C lifetime objects within unions, 8715 // and rather than cause the program to fail, we make those 8716 // members unavailable. 8717 SourceLocation Loc = FD->getLocation(); 8718 if (getSourceManager().isInSystemHeader(Loc)) { 8719 if (!FD->hasAttr<UnavailableAttr>()) 8720 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8721 "this system field has retaining ownership")); 8722 return false; 8723 } 8724 } 8725 8726 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8727 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8728 diag::err_illegal_union_or_anon_struct_member) 8729 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8730 DiagnoseNontrivial(RT, member); 8731 return !getLangOptions().CPlusPlus0x; 8732 } 8733 } 8734 } 8735 8736 return false; 8737} 8738 8739/// DiagnoseNontrivial - Given that a class has a non-trivial 8740/// special member, figure out why. 8741void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8742 QualType QT(T, 0U); 8743 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8744 8745 // Check whether the member was user-declared. 8746 switch (member) { 8747 case CXXInvalid: 8748 break; 8749 8750 case CXXDefaultConstructor: 8751 if (RD->hasUserDeclaredConstructor()) { 8752 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8753 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8754 const FunctionDecl *body = 0; 8755 ci->hasBody(body); 8756 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8757 SourceLocation CtorLoc = ci->getLocation(); 8758 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8759 return; 8760 } 8761 } 8762 8763 llvm_unreachable("found no user-declared constructors"); 8764 } 8765 break; 8766 8767 case CXXCopyConstructor: 8768 if (RD->hasUserDeclaredCopyConstructor()) { 8769 SourceLocation CtorLoc = 8770 RD->getCopyConstructor(0)->getLocation(); 8771 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8772 return; 8773 } 8774 break; 8775 8776 case CXXMoveConstructor: 8777 if (RD->hasUserDeclaredMoveConstructor()) { 8778 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8779 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8780 return; 8781 } 8782 break; 8783 8784 case CXXCopyAssignment: 8785 if (RD->hasUserDeclaredCopyAssignment()) { 8786 // FIXME: this should use the location of the copy 8787 // assignment, not the type. 8788 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8789 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8790 return; 8791 } 8792 break; 8793 8794 case CXXMoveAssignment: 8795 if (RD->hasUserDeclaredMoveAssignment()) { 8796 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8797 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8798 return; 8799 } 8800 break; 8801 8802 case CXXDestructor: 8803 if (RD->hasUserDeclaredDestructor()) { 8804 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8805 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8806 return; 8807 } 8808 break; 8809 } 8810 8811 typedef CXXRecordDecl::base_class_iterator base_iter; 8812 8813 // Virtual bases and members inhibit trivial copying/construction, 8814 // but not trivial destruction. 8815 if (member != CXXDestructor) { 8816 // Check for virtual bases. vbases includes indirect virtual bases, 8817 // so we just iterate through the direct bases. 8818 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8819 if (bi->isVirtual()) { 8820 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8821 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8822 return; 8823 } 8824 8825 // Check for virtual methods. 8826 typedef CXXRecordDecl::method_iterator meth_iter; 8827 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8828 ++mi) { 8829 if (mi->isVirtual()) { 8830 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8831 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8832 return; 8833 } 8834 } 8835 } 8836 8837 bool (CXXRecordDecl::*hasTrivial)() const; 8838 switch (member) { 8839 case CXXDefaultConstructor: 8840 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8841 case CXXCopyConstructor: 8842 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8843 case CXXCopyAssignment: 8844 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8845 case CXXDestructor: 8846 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8847 default: 8848 llvm_unreachable("unexpected special member"); 8849 } 8850 8851 // Check for nontrivial bases (and recurse). 8852 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8853 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8854 assert(BaseRT && "Don't know how to handle dependent bases"); 8855 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8856 if (!(BaseRecTy->*hasTrivial)()) { 8857 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8858 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8859 DiagnoseNontrivial(BaseRT, member); 8860 return; 8861 } 8862 } 8863 8864 // Check for nontrivial members (and recurse). 8865 typedef RecordDecl::field_iterator field_iter; 8866 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8867 ++fi) { 8868 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8869 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8870 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8871 8872 if (!(EltRD->*hasTrivial)()) { 8873 SourceLocation FLoc = (*fi)->getLocation(); 8874 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8875 DiagnoseNontrivial(EltRT, member); 8876 return; 8877 } 8878 } 8879 8880 if (EltTy->isObjCLifetimeType()) { 8881 switch (EltTy.getObjCLifetime()) { 8882 case Qualifiers::OCL_None: 8883 case Qualifiers::OCL_ExplicitNone: 8884 break; 8885 8886 case Qualifiers::OCL_Autoreleasing: 8887 case Qualifiers::OCL_Weak: 8888 case Qualifiers::OCL_Strong: 8889 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8890 << QT << EltTy.getObjCLifetime(); 8891 return; 8892 } 8893 } 8894 } 8895 8896 llvm_unreachable("found no explanation for non-trivial member"); 8897} 8898 8899/// TranslateIvarVisibility - Translate visibility from a token ID to an 8900/// AST enum value. 8901static ObjCIvarDecl::AccessControl 8902TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8903 switch (ivarVisibility) { 8904 default: llvm_unreachable("Unknown visitibility kind"); 8905 case tok::objc_private: return ObjCIvarDecl::Private; 8906 case tok::objc_public: return ObjCIvarDecl::Public; 8907 case tok::objc_protected: return ObjCIvarDecl::Protected; 8908 case tok::objc_package: return ObjCIvarDecl::Package; 8909 } 8910} 8911 8912/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8913/// in order to create an IvarDecl object for it. 8914Decl *Sema::ActOnIvar(Scope *S, 8915 SourceLocation DeclStart, 8916 Declarator &D, Expr *BitfieldWidth, 8917 tok::ObjCKeywordKind Visibility) { 8918 8919 IdentifierInfo *II = D.getIdentifier(); 8920 Expr *BitWidth = (Expr*)BitfieldWidth; 8921 SourceLocation Loc = DeclStart; 8922 if (II) Loc = D.getIdentifierLoc(); 8923 8924 // FIXME: Unnamed fields can be handled in various different ways, for 8925 // example, unnamed unions inject all members into the struct namespace! 8926 8927 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8928 QualType T = TInfo->getType(); 8929 8930 if (BitWidth) { 8931 // 6.7.2.1p3, 6.7.2.1p4 8932 if (VerifyBitField(Loc, II, T, BitWidth)) { 8933 D.setInvalidType(); 8934 BitWidth = 0; 8935 } 8936 } else { 8937 // Not a bitfield. 8938 8939 // validate II. 8940 8941 } 8942 if (T->isReferenceType()) { 8943 Diag(Loc, diag::err_ivar_reference_type); 8944 D.setInvalidType(); 8945 } 8946 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8947 // than a variably modified type. 8948 else if (T->isVariablyModifiedType()) { 8949 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8950 D.setInvalidType(); 8951 } 8952 8953 // Get the visibility (access control) for this ivar. 8954 ObjCIvarDecl::AccessControl ac = 8955 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8956 : ObjCIvarDecl::None; 8957 // Must set ivar's DeclContext to its enclosing interface. 8958 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8959 ObjCContainerDecl *EnclosingContext; 8960 if (ObjCImplementationDecl *IMPDecl = 8961 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8962 if (!LangOpts.ObjCNonFragileABI2) { 8963 // Case of ivar declared in an implementation. Context is that of its class. 8964 EnclosingContext = IMPDecl->getClassInterface(); 8965 assert(EnclosingContext && "Implementation has no class interface!"); 8966 } 8967 else 8968 EnclosingContext = EnclosingDecl; 8969 } else { 8970 if (ObjCCategoryDecl *CDecl = 8971 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8972 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8973 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8974 return 0; 8975 } 8976 } 8977 EnclosingContext = EnclosingDecl; 8978 } 8979 8980 // Construct the decl. 8981 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8982 DeclStart, Loc, II, T, 8983 TInfo, ac, (Expr *)BitfieldWidth); 8984 8985 if (II) { 8986 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8987 ForRedeclaration); 8988 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8989 && !isa<TagDecl>(PrevDecl)) { 8990 Diag(Loc, diag::err_duplicate_member) << II; 8991 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8992 NewID->setInvalidDecl(); 8993 } 8994 } 8995 8996 // Process attributes attached to the ivar. 8997 ProcessDeclAttributes(S, NewID, D); 8998 8999 if (D.isInvalidType()) 9000 NewID->setInvalidDecl(); 9001 9002 // In ARC, infer 'retaining' for ivars of retainable type. 9003 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9004 NewID->setInvalidDecl(); 9005 9006 if (D.getDeclSpec().isModulePrivateSpecified()) 9007 NewID->setModulePrivate(); 9008 9009 if (II) { 9010 // FIXME: When interfaces are DeclContexts, we'll need to add 9011 // these to the interface. 9012 S->AddDecl(NewID); 9013 IdResolver.AddDecl(NewID); 9014 } 9015 9016 return NewID; 9017} 9018 9019/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9020/// class and class extensions. For every class @interface and class 9021/// extension @interface, if the last ivar is a bitfield of any type, 9022/// then add an implicit `char :0` ivar to the end of that interface. 9023void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9024 SmallVectorImpl<Decl *> &AllIvarDecls) { 9025 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9026 return; 9027 9028 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9029 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9030 9031 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9032 return; 9033 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9034 if (!ID) { 9035 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9036 if (!CD->IsClassExtension()) 9037 return; 9038 } 9039 // No need to add this to end of @implementation. 9040 else 9041 return; 9042 } 9043 // All conditions are met. Add a new bitfield to the tail end of ivars. 9044 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9045 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9046 9047 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9048 DeclLoc, DeclLoc, 0, 9049 Context.CharTy, 9050 Context.getTrivialTypeSourceInfo(Context.CharTy, 9051 DeclLoc), 9052 ObjCIvarDecl::Private, BW, 9053 true); 9054 AllIvarDecls.push_back(Ivar); 9055} 9056 9057void Sema::ActOnFields(Scope* S, 9058 SourceLocation RecLoc, Decl *EnclosingDecl, 9059 llvm::ArrayRef<Decl *> Fields, 9060 SourceLocation LBrac, SourceLocation RBrac, 9061 AttributeList *Attr) { 9062 assert(EnclosingDecl && "missing record or interface decl"); 9063 9064 // If the decl this is being inserted into is invalid, then it may be a 9065 // redeclaration or some other bogus case. Don't try to add fields to it. 9066 if (EnclosingDecl->isInvalidDecl()) 9067 return; 9068 9069 // Verify that all the fields are okay. 9070 unsigned NumNamedMembers = 0; 9071 SmallVector<FieldDecl*, 32> RecFields; 9072 9073 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9074 bool ARCErrReported = false; 9075 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9076 i != end; ++i) { 9077 FieldDecl *FD = cast<FieldDecl>(*i); 9078 9079 // Get the type for the field. 9080 const Type *FDTy = FD->getType().getTypePtr(); 9081 9082 if (!FD->isAnonymousStructOrUnion()) { 9083 // Remember all fields written by the user. 9084 RecFields.push_back(FD); 9085 } 9086 9087 // If the field is already invalid for some reason, don't emit more 9088 // diagnostics about it. 9089 if (FD->isInvalidDecl()) { 9090 EnclosingDecl->setInvalidDecl(); 9091 continue; 9092 } 9093 9094 // C99 6.7.2.1p2: 9095 // A structure or union shall not contain a member with 9096 // incomplete or function type (hence, a structure shall not 9097 // contain an instance of itself, but may contain a pointer to 9098 // an instance of itself), except that the last member of a 9099 // structure with more than one named member may have incomplete 9100 // array type; such a structure (and any union containing, 9101 // possibly recursively, a member that is such a structure) 9102 // shall not be a member of a structure or an element of an 9103 // array. 9104 if (FDTy->isFunctionType()) { 9105 // Field declared as a function. 9106 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9107 << FD->getDeclName(); 9108 FD->setInvalidDecl(); 9109 EnclosingDecl->setInvalidDecl(); 9110 continue; 9111 } else if (FDTy->isIncompleteArrayType() && Record && 9112 ((i + 1 == Fields.end() && !Record->isUnion()) || 9113 ((getLangOptions().MicrosoftExt || 9114 getLangOptions().CPlusPlus) && 9115 (i + 1 == Fields.end() || Record->isUnion())))) { 9116 // Flexible array member. 9117 // Microsoft and g++ is more permissive regarding flexible array. 9118 // It will accept flexible array in union and also 9119 // as the sole element of a struct/class. 9120 if (getLangOptions().MicrosoftExt) { 9121 if (Record->isUnion()) 9122 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9123 << FD->getDeclName(); 9124 else if (Fields.size() == 1) 9125 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9126 << FD->getDeclName() << Record->getTagKind(); 9127 } else if (getLangOptions().CPlusPlus) { 9128 if (Record->isUnion()) 9129 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9130 << FD->getDeclName(); 9131 else if (Fields.size() == 1) 9132 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9133 << FD->getDeclName() << Record->getTagKind(); 9134 } else if (NumNamedMembers < 1) { 9135 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9136 << FD->getDeclName(); 9137 FD->setInvalidDecl(); 9138 EnclosingDecl->setInvalidDecl(); 9139 continue; 9140 } 9141 if (!FD->getType()->isDependentType() && 9142 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9143 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9144 << FD->getDeclName() << FD->getType(); 9145 FD->setInvalidDecl(); 9146 EnclosingDecl->setInvalidDecl(); 9147 continue; 9148 } 9149 // Okay, we have a legal flexible array member at the end of the struct. 9150 if (Record) 9151 Record->setHasFlexibleArrayMember(true); 9152 } else if (!FDTy->isDependentType() && 9153 RequireCompleteType(FD->getLocation(), FD->getType(), 9154 diag::err_field_incomplete)) { 9155 // Incomplete type 9156 FD->setInvalidDecl(); 9157 EnclosingDecl->setInvalidDecl(); 9158 continue; 9159 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9160 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9161 // If this is a member of a union, then entire union becomes "flexible". 9162 if (Record && Record->isUnion()) { 9163 Record->setHasFlexibleArrayMember(true); 9164 } else { 9165 // If this is a struct/class and this is not the last element, reject 9166 // it. Note that GCC supports variable sized arrays in the middle of 9167 // structures. 9168 if (i + 1 != Fields.end()) 9169 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9170 << FD->getDeclName() << FD->getType(); 9171 else { 9172 // We support flexible arrays at the end of structs in 9173 // other structs as an extension. 9174 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9175 << FD->getDeclName(); 9176 if (Record) 9177 Record->setHasFlexibleArrayMember(true); 9178 } 9179 } 9180 } 9181 if (Record && FDTTy->getDecl()->hasObjectMember()) 9182 Record->setHasObjectMember(true); 9183 } else if (FDTy->isObjCObjectType()) { 9184 /// A field cannot be an Objective-c object 9185 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9186 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9187 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9188 FD->setType(T); 9189 } 9190 else if (!getLangOptions().CPlusPlus) { 9191 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9192 // It's an error in ARC if a field has lifetime. 9193 // We don't want to report this in a system header, though, 9194 // so we just make the field unavailable. 9195 // FIXME: that's really not sufficient; we need to make the type 9196 // itself invalid to, say, initialize or copy. 9197 QualType T = FD->getType(); 9198 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9199 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9200 SourceLocation loc = FD->getLocation(); 9201 if (getSourceManager().isInSystemHeader(loc)) { 9202 if (!FD->hasAttr<UnavailableAttr>()) { 9203 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9204 "this system field has retaining ownership")); 9205 } 9206 } else { 9207 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9208 << T->isBlockPointerType(); 9209 } 9210 ARCErrReported = true; 9211 } 9212 } 9213 else if (getLangOptions().ObjC1 && 9214 getLangOptions().getGC() != LangOptions::NonGC && 9215 Record && !Record->hasObjectMember()) { 9216 if (FD->getType()->isObjCObjectPointerType() || 9217 FD->getType().isObjCGCStrong()) 9218 Record->setHasObjectMember(true); 9219 else if (Context.getAsArrayType(FD->getType())) { 9220 QualType BaseType = Context.getBaseElementType(FD->getType()); 9221 if (BaseType->isRecordType() && 9222 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9223 Record->setHasObjectMember(true); 9224 else if (BaseType->isObjCObjectPointerType() || 9225 BaseType.isObjCGCStrong()) 9226 Record->setHasObjectMember(true); 9227 } 9228 } 9229 } 9230 // Keep track of the number of named members. 9231 if (FD->getIdentifier()) 9232 ++NumNamedMembers; 9233 } 9234 9235 // Okay, we successfully defined 'Record'. 9236 if (Record) { 9237 bool Completed = false; 9238 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9239 if (!CXXRecord->isInvalidDecl()) { 9240 // Set access bits correctly on the directly-declared conversions. 9241 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9242 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9243 I != E; ++I) 9244 Convs->setAccess(I, (*I)->getAccess()); 9245 9246 if (!CXXRecord->isDependentType()) { 9247 // Objective-C Automatic Reference Counting: 9248 // If a class has a non-static data member of Objective-C pointer 9249 // type (or array thereof), it is a non-POD type and its 9250 // default constructor (if any), copy constructor, copy assignment 9251 // operator, and destructor are non-trivial. 9252 // 9253 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9254 // However, here we check whether this particular class is only 9255 // non-POD because of the presence of an Objective-C pointer member. 9256 // If so, objects of this type cannot be shared between code compiled 9257 // with instant objects and code compiled with manual retain/release. 9258 if (getLangOptions().ObjCAutoRefCount && 9259 CXXRecord->hasObjectMember() && 9260 CXXRecord->getLinkage() == ExternalLinkage) { 9261 if (CXXRecord->isPOD()) { 9262 Diag(CXXRecord->getLocation(), 9263 diag::warn_arc_non_pod_class_with_object_member) 9264 << CXXRecord; 9265 } else { 9266 // FIXME: Fix-Its would be nice here, but finding a good location 9267 // for them is going to be tricky. 9268 if (CXXRecord->hasTrivialCopyConstructor()) 9269 Diag(CXXRecord->getLocation(), 9270 diag::warn_arc_trivial_member_function_with_object_member) 9271 << CXXRecord << 0; 9272 if (CXXRecord->hasTrivialCopyAssignment()) 9273 Diag(CXXRecord->getLocation(), 9274 diag::warn_arc_trivial_member_function_with_object_member) 9275 << CXXRecord << 1; 9276 if (CXXRecord->hasTrivialDestructor()) 9277 Diag(CXXRecord->getLocation(), 9278 diag::warn_arc_trivial_member_function_with_object_member) 9279 << CXXRecord << 2; 9280 } 9281 } 9282 9283 // Adjust user-defined destructor exception spec. 9284 if (getLangOptions().CPlusPlus0x && 9285 CXXRecord->hasUserDeclaredDestructor()) 9286 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9287 9288 // Add any implicitly-declared members to this class. 9289 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9290 9291 // If we have virtual base classes, we may end up finding multiple 9292 // final overriders for a given virtual function. Check for this 9293 // problem now. 9294 if (CXXRecord->getNumVBases()) { 9295 CXXFinalOverriderMap FinalOverriders; 9296 CXXRecord->getFinalOverriders(FinalOverriders); 9297 9298 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9299 MEnd = FinalOverriders.end(); 9300 M != MEnd; ++M) { 9301 for (OverridingMethods::iterator SO = M->second.begin(), 9302 SOEnd = M->second.end(); 9303 SO != SOEnd; ++SO) { 9304 assert(SO->second.size() > 0 && 9305 "Virtual function without overridding functions?"); 9306 if (SO->second.size() == 1) 9307 continue; 9308 9309 // C++ [class.virtual]p2: 9310 // In a derived class, if a virtual member function of a base 9311 // class subobject has more than one final overrider the 9312 // program is ill-formed. 9313 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9314 << (NamedDecl *)M->first << Record; 9315 Diag(M->first->getLocation(), 9316 diag::note_overridden_virtual_function); 9317 for (OverridingMethods::overriding_iterator 9318 OM = SO->second.begin(), 9319 OMEnd = SO->second.end(); 9320 OM != OMEnd; ++OM) 9321 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9322 << (NamedDecl *)M->first << OM->Method->getParent(); 9323 9324 Record->setInvalidDecl(); 9325 } 9326 } 9327 CXXRecord->completeDefinition(&FinalOverriders); 9328 Completed = true; 9329 } 9330 } 9331 } 9332 } 9333 9334 if (!Completed) 9335 Record->completeDefinition(); 9336 9337 // Now that the record is complete, do any delayed exception spec checks 9338 // we were missing. 9339 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9340 const CXXDestructorDecl *Dtor = 9341 DelayedDestructorExceptionSpecChecks.back().first; 9342 if (Dtor->getParent() != Record) 9343 break; 9344 9345 assert(!Dtor->getParent()->isDependentType() && 9346 "Should not ever add destructors of templates into the list."); 9347 CheckOverridingFunctionExceptionSpec(Dtor, 9348 DelayedDestructorExceptionSpecChecks.back().second); 9349 DelayedDestructorExceptionSpecChecks.pop_back(); 9350 } 9351 9352 } else { 9353 ObjCIvarDecl **ClsFields = 9354 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9355 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9356 ID->setEndOfDefinitionLoc(RBrac); 9357 // Add ivar's to class's DeclContext. 9358 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9359 ClsFields[i]->setLexicalDeclContext(ID); 9360 ID->addDecl(ClsFields[i]); 9361 } 9362 // Must enforce the rule that ivars in the base classes may not be 9363 // duplicates. 9364 if (ID->getSuperClass()) 9365 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9366 } else if (ObjCImplementationDecl *IMPDecl = 9367 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9368 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9369 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9370 // Ivar declared in @implementation never belongs to the implementation. 9371 // Only it is in implementation's lexical context. 9372 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9373 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9374 } else if (ObjCCategoryDecl *CDecl = 9375 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9376 // case of ivars in class extension; all other cases have been 9377 // reported as errors elsewhere. 9378 // FIXME. Class extension does not have a LocEnd field. 9379 // CDecl->setLocEnd(RBrac); 9380 // Add ivar's to class extension's DeclContext. 9381 // Diagnose redeclaration of private ivars. 9382 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9383 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9384 if (IDecl) { 9385 if (const ObjCIvarDecl *ClsIvar = 9386 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9387 Diag(ClsFields[i]->getLocation(), 9388 diag::err_duplicate_ivar_declaration); 9389 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9390 continue; 9391 } 9392 for (const ObjCCategoryDecl *ClsExtDecl = 9393 IDecl->getFirstClassExtension(); 9394 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9395 if (const ObjCIvarDecl *ClsExtIvar = 9396 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9397 Diag(ClsFields[i]->getLocation(), 9398 diag::err_duplicate_ivar_declaration); 9399 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9400 continue; 9401 } 9402 } 9403 } 9404 ClsFields[i]->setLexicalDeclContext(CDecl); 9405 CDecl->addDecl(ClsFields[i]); 9406 } 9407 } 9408 } 9409 9410 if (Attr) 9411 ProcessDeclAttributeList(S, Record, Attr); 9412 9413 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9414 // set the visibility of this record. 9415 if (Record && !Record->getDeclContext()->isRecord()) 9416 AddPushedVisibilityAttribute(Record); 9417} 9418 9419/// \brief Determine whether the given integral value is representable within 9420/// the given type T. 9421static bool isRepresentableIntegerValue(ASTContext &Context, 9422 llvm::APSInt &Value, 9423 QualType T) { 9424 assert(T->isIntegralType(Context) && "Integral type required!"); 9425 unsigned BitWidth = Context.getIntWidth(T); 9426 9427 if (Value.isUnsigned() || Value.isNonNegative()) { 9428 if (T->isSignedIntegerOrEnumerationType()) 9429 --BitWidth; 9430 return Value.getActiveBits() <= BitWidth; 9431 } 9432 return Value.getMinSignedBits() <= BitWidth; 9433} 9434 9435// \brief Given an integral type, return the next larger integral type 9436// (or a NULL type of no such type exists). 9437static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9438 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9439 // enum checking below. 9440 assert(T->isIntegralType(Context) && "Integral type required!"); 9441 const unsigned NumTypes = 4; 9442 QualType SignedIntegralTypes[NumTypes] = { 9443 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9444 }; 9445 QualType UnsignedIntegralTypes[NumTypes] = { 9446 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9447 Context.UnsignedLongLongTy 9448 }; 9449 9450 unsigned BitWidth = Context.getTypeSize(T); 9451 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9452 : UnsignedIntegralTypes; 9453 for (unsigned I = 0; I != NumTypes; ++I) 9454 if (Context.getTypeSize(Types[I]) > BitWidth) 9455 return Types[I]; 9456 9457 return QualType(); 9458} 9459 9460EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9461 EnumConstantDecl *LastEnumConst, 9462 SourceLocation IdLoc, 9463 IdentifierInfo *Id, 9464 Expr *Val) { 9465 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9466 llvm::APSInt EnumVal(IntWidth); 9467 QualType EltTy; 9468 9469 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9470 Val = 0; 9471 9472 if (Val) 9473 Val = DefaultLvalueConversion(Val).take(); 9474 9475 if (Val) { 9476 if (Enum->isDependentType() || Val->isTypeDependent()) 9477 EltTy = Context.DependentTy; 9478 else { 9479 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9480 SourceLocation ExpLoc; 9481 if (!Val->isValueDependent() && 9482 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9483 Val = 0; 9484 } else { 9485 if (!getLangOptions().CPlusPlus) { 9486 // C99 6.7.2.2p2: 9487 // The expression that defines the value of an enumeration constant 9488 // shall be an integer constant expression that has a value 9489 // representable as an int. 9490 9491 // Complain if the value is not representable in an int. 9492 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9493 Diag(IdLoc, diag::ext_enum_value_not_int) 9494 << EnumVal.toString(10) << Val->getSourceRange() 9495 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9496 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9497 // Force the type of the expression to 'int'. 9498 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9499 } 9500 } 9501 9502 if (Enum->isFixed()) { 9503 EltTy = Enum->getIntegerType(); 9504 9505 // C++0x [dcl.enum]p5: 9506 // ... if the initializing value of an enumerator cannot be 9507 // represented by the underlying type, the program is ill-formed. 9508 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9509 if (getLangOptions().MicrosoftExt) { 9510 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9511 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9512 } else 9513 Diag(IdLoc, diag::err_enumerator_too_large) 9514 << EltTy; 9515 } else 9516 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9517 } 9518 else { 9519 // C++0x [dcl.enum]p5: 9520 // If the underlying type is not fixed, the type of each enumerator 9521 // is the type of its initializing value: 9522 // - If an initializer is specified for an enumerator, the 9523 // initializing value has the same type as the expression. 9524 EltTy = Val->getType(); 9525 } 9526 } 9527 } 9528 } 9529 9530 if (!Val) { 9531 if (Enum->isDependentType()) 9532 EltTy = Context.DependentTy; 9533 else if (!LastEnumConst) { 9534 // C++0x [dcl.enum]p5: 9535 // If the underlying type is not fixed, the type of each enumerator 9536 // is the type of its initializing value: 9537 // - If no initializer is specified for the first enumerator, the 9538 // initializing value has an unspecified integral type. 9539 // 9540 // GCC uses 'int' for its unspecified integral type, as does 9541 // C99 6.7.2.2p3. 9542 if (Enum->isFixed()) { 9543 EltTy = Enum->getIntegerType(); 9544 } 9545 else { 9546 EltTy = Context.IntTy; 9547 } 9548 } else { 9549 // Assign the last value + 1. 9550 EnumVal = LastEnumConst->getInitVal(); 9551 ++EnumVal; 9552 EltTy = LastEnumConst->getType(); 9553 9554 // Check for overflow on increment. 9555 if (EnumVal < LastEnumConst->getInitVal()) { 9556 // C++0x [dcl.enum]p5: 9557 // If the underlying type is not fixed, the type of each enumerator 9558 // is the type of its initializing value: 9559 // 9560 // - Otherwise the type of the initializing value is the same as 9561 // the type of the initializing value of the preceding enumerator 9562 // unless the incremented value is not representable in that type, 9563 // in which case the type is an unspecified integral type 9564 // sufficient to contain the incremented value. If no such type 9565 // exists, the program is ill-formed. 9566 QualType T = getNextLargerIntegralType(Context, EltTy); 9567 if (T.isNull() || Enum->isFixed()) { 9568 // There is no integral type larger enough to represent this 9569 // value. Complain, then allow the value to wrap around. 9570 EnumVal = LastEnumConst->getInitVal(); 9571 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9572 ++EnumVal; 9573 if (Enum->isFixed()) 9574 // When the underlying type is fixed, this is ill-formed. 9575 Diag(IdLoc, diag::err_enumerator_wrapped) 9576 << EnumVal.toString(10) 9577 << EltTy; 9578 else 9579 Diag(IdLoc, diag::warn_enumerator_too_large) 9580 << EnumVal.toString(10); 9581 } else { 9582 EltTy = T; 9583 } 9584 9585 // Retrieve the last enumerator's value, extent that type to the 9586 // type that is supposed to be large enough to represent the incremented 9587 // value, then increment. 9588 EnumVal = LastEnumConst->getInitVal(); 9589 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9590 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9591 ++EnumVal; 9592 9593 // If we're not in C++, diagnose the overflow of enumerator values, 9594 // which in C99 means that the enumerator value is not representable in 9595 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9596 // permits enumerator values that are representable in some larger 9597 // integral type. 9598 if (!getLangOptions().CPlusPlus && !T.isNull()) 9599 Diag(IdLoc, diag::warn_enum_value_overflow); 9600 } else if (!getLangOptions().CPlusPlus && 9601 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9602 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9603 Diag(IdLoc, diag::ext_enum_value_not_int) 9604 << EnumVal.toString(10) << 1; 9605 } 9606 } 9607 } 9608 9609 if (!EltTy->isDependentType()) { 9610 // Make the enumerator value match the signedness and size of the 9611 // enumerator's type. 9612 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9613 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9614 } 9615 9616 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9617 Val, EnumVal); 9618} 9619 9620 9621Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9622 SourceLocation IdLoc, IdentifierInfo *Id, 9623 AttributeList *Attr, 9624 SourceLocation EqualLoc, Expr *val) { 9625 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9626 EnumConstantDecl *LastEnumConst = 9627 cast_or_null<EnumConstantDecl>(lastEnumConst); 9628 Expr *Val = static_cast<Expr*>(val); 9629 9630 // The scope passed in may not be a decl scope. Zip up the scope tree until 9631 // we find one that is. 9632 S = getNonFieldDeclScope(S); 9633 9634 // Verify that there isn't already something declared with this name in this 9635 // scope. 9636 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9637 ForRedeclaration); 9638 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9639 // Maybe we will complain about the shadowed template parameter. 9640 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9641 // Just pretend that we didn't see the previous declaration. 9642 PrevDecl = 0; 9643 } 9644 9645 if (PrevDecl) { 9646 // When in C++, we may get a TagDecl with the same name; in this case the 9647 // enum constant will 'hide' the tag. 9648 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9649 "Received TagDecl when not in C++!"); 9650 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9651 if (isa<EnumConstantDecl>(PrevDecl)) 9652 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9653 else 9654 Diag(IdLoc, diag::err_redefinition) << Id; 9655 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9656 return 0; 9657 } 9658 } 9659 9660 // C++ [class.mem]p13: 9661 // If T is the name of a class, then each of the following shall have a 9662 // name different from T: 9663 // - every enumerator of every member of class T that is an enumerated 9664 // type 9665 if (CXXRecordDecl *Record 9666 = dyn_cast<CXXRecordDecl>( 9667 TheEnumDecl->getDeclContext()->getRedeclContext())) 9668 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9669 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9670 9671 EnumConstantDecl *New = 9672 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9673 9674 if (New) { 9675 // Process attributes. 9676 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9677 9678 // Register this decl in the current scope stack. 9679 New->setAccess(TheEnumDecl->getAccess()); 9680 PushOnScopeChains(New, S); 9681 } 9682 9683 return New; 9684} 9685 9686void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9687 SourceLocation RBraceLoc, Decl *EnumDeclX, 9688 Decl **Elements, unsigned NumElements, 9689 Scope *S, AttributeList *Attr) { 9690 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9691 QualType EnumType = Context.getTypeDeclType(Enum); 9692 9693 if (Attr) 9694 ProcessDeclAttributeList(S, Enum, Attr); 9695 9696 if (Enum->isDependentType()) { 9697 for (unsigned i = 0; i != NumElements; ++i) { 9698 EnumConstantDecl *ECD = 9699 cast_or_null<EnumConstantDecl>(Elements[i]); 9700 if (!ECD) continue; 9701 9702 ECD->setType(EnumType); 9703 } 9704 9705 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9706 return; 9707 } 9708 9709 // TODO: If the result value doesn't fit in an int, it must be a long or long 9710 // long value. ISO C does not support this, but GCC does as an extension, 9711 // emit a warning. 9712 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9713 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9714 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9715 9716 // Verify that all the values are okay, compute the size of the values, and 9717 // reverse the list. 9718 unsigned NumNegativeBits = 0; 9719 unsigned NumPositiveBits = 0; 9720 9721 // Keep track of whether all elements have type int. 9722 bool AllElementsInt = true; 9723 9724 for (unsigned i = 0; i != NumElements; ++i) { 9725 EnumConstantDecl *ECD = 9726 cast_or_null<EnumConstantDecl>(Elements[i]); 9727 if (!ECD) continue; // Already issued a diagnostic. 9728 9729 const llvm::APSInt &InitVal = ECD->getInitVal(); 9730 9731 // Keep track of the size of positive and negative values. 9732 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9733 NumPositiveBits = std::max(NumPositiveBits, 9734 (unsigned)InitVal.getActiveBits()); 9735 else 9736 NumNegativeBits = std::max(NumNegativeBits, 9737 (unsigned)InitVal.getMinSignedBits()); 9738 9739 // Keep track of whether every enum element has type int (very commmon). 9740 if (AllElementsInt) 9741 AllElementsInt = ECD->getType() == Context.IntTy; 9742 } 9743 9744 // Figure out the type that should be used for this enum. 9745 QualType BestType; 9746 unsigned BestWidth; 9747 9748 // C++0x N3000 [conv.prom]p3: 9749 // An rvalue of an unscoped enumeration type whose underlying 9750 // type is not fixed can be converted to an rvalue of the first 9751 // of the following types that can represent all the values of 9752 // the enumeration: int, unsigned int, long int, unsigned long 9753 // int, long long int, or unsigned long long int. 9754 // C99 6.4.4.3p2: 9755 // An identifier declared as an enumeration constant has type int. 9756 // The C99 rule is modified by a gcc extension 9757 QualType BestPromotionType; 9758 9759 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9760 // -fshort-enums is the equivalent to specifying the packed attribute on all 9761 // enum definitions. 9762 if (LangOpts.ShortEnums) 9763 Packed = true; 9764 9765 if (Enum->isFixed()) { 9766 BestType = Enum->getIntegerType(); 9767 if (BestType->isPromotableIntegerType()) 9768 BestPromotionType = Context.getPromotedIntegerType(BestType); 9769 else 9770 BestPromotionType = BestType; 9771 // We don't need to set BestWidth, because BestType is going to be the type 9772 // of the enumerators, but we do anyway because otherwise some compilers 9773 // warn that it might be used uninitialized. 9774 BestWidth = CharWidth; 9775 } 9776 else if (NumNegativeBits) { 9777 // If there is a negative value, figure out the smallest integer type (of 9778 // int/long/longlong) that fits. 9779 // If it's packed, check also if it fits a char or a short. 9780 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9781 BestType = Context.SignedCharTy; 9782 BestWidth = CharWidth; 9783 } else if (Packed && NumNegativeBits <= ShortWidth && 9784 NumPositiveBits < ShortWidth) { 9785 BestType = Context.ShortTy; 9786 BestWidth = ShortWidth; 9787 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9788 BestType = Context.IntTy; 9789 BestWidth = IntWidth; 9790 } else { 9791 BestWidth = Context.getTargetInfo().getLongWidth(); 9792 9793 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9794 BestType = Context.LongTy; 9795 } else { 9796 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9797 9798 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9799 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9800 BestType = Context.LongLongTy; 9801 } 9802 } 9803 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9804 } else { 9805 // If there is no negative value, figure out the smallest type that fits 9806 // all of the enumerator values. 9807 // If it's packed, check also if it fits a char or a short. 9808 if (Packed && NumPositiveBits <= CharWidth) { 9809 BestType = Context.UnsignedCharTy; 9810 BestPromotionType = Context.IntTy; 9811 BestWidth = CharWidth; 9812 } else if (Packed && NumPositiveBits <= ShortWidth) { 9813 BestType = Context.UnsignedShortTy; 9814 BestPromotionType = Context.IntTy; 9815 BestWidth = ShortWidth; 9816 } else if (NumPositiveBits <= IntWidth) { 9817 BestType = Context.UnsignedIntTy; 9818 BestWidth = IntWidth; 9819 BestPromotionType 9820 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9821 ? Context.UnsignedIntTy : Context.IntTy; 9822 } else if (NumPositiveBits <= 9823 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9824 BestType = Context.UnsignedLongTy; 9825 BestPromotionType 9826 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9827 ? Context.UnsignedLongTy : Context.LongTy; 9828 } else { 9829 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9830 assert(NumPositiveBits <= BestWidth && 9831 "How could an initializer get larger than ULL?"); 9832 BestType = Context.UnsignedLongLongTy; 9833 BestPromotionType 9834 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9835 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9836 } 9837 } 9838 9839 // Loop over all of the enumerator constants, changing their types to match 9840 // the type of the enum if needed. 9841 for (unsigned i = 0; i != NumElements; ++i) { 9842 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9843 if (!ECD) continue; // Already issued a diagnostic. 9844 9845 // Standard C says the enumerators have int type, but we allow, as an 9846 // extension, the enumerators to be larger than int size. If each 9847 // enumerator value fits in an int, type it as an int, otherwise type it the 9848 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9849 // that X has type 'int', not 'unsigned'. 9850 9851 // Determine whether the value fits into an int. 9852 llvm::APSInt InitVal = ECD->getInitVal(); 9853 9854 // If it fits into an integer type, force it. Otherwise force it to match 9855 // the enum decl type. 9856 QualType NewTy; 9857 unsigned NewWidth; 9858 bool NewSign; 9859 if (!getLangOptions().CPlusPlus && 9860 !Enum->isFixed() && 9861 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9862 NewTy = Context.IntTy; 9863 NewWidth = IntWidth; 9864 NewSign = true; 9865 } else if (ECD->getType() == BestType) { 9866 // Already the right type! 9867 if (getLangOptions().CPlusPlus) 9868 // C++ [dcl.enum]p4: Following the closing brace of an 9869 // enum-specifier, each enumerator has the type of its 9870 // enumeration. 9871 ECD->setType(EnumType); 9872 continue; 9873 } else { 9874 NewTy = BestType; 9875 NewWidth = BestWidth; 9876 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9877 } 9878 9879 // Adjust the APSInt value. 9880 InitVal = InitVal.extOrTrunc(NewWidth); 9881 InitVal.setIsSigned(NewSign); 9882 ECD->setInitVal(InitVal); 9883 9884 // Adjust the Expr initializer and type. 9885 if (ECD->getInitExpr() && 9886 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9887 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9888 CK_IntegralCast, 9889 ECD->getInitExpr(), 9890 /*base paths*/ 0, 9891 VK_RValue)); 9892 if (getLangOptions().CPlusPlus) 9893 // C++ [dcl.enum]p4: Following the closing brace of an 9894 // enum-specifier, each enumerator has the type of its 9895 // enumeration. 9896 ECD->setType(EnumType); 9897 else 9898 ECD->setType(NewTy); 9899 } 9900 9901 Enum->completeDefinition(BestType, BestPromotionType, 9902 NumPositiveBits, NumNegativeBits); 9903} 9904 9905Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9906 SourceLocation StartLoc, 9907 SourceLocation EndLoc) { 9908 StringLiteral *AsmString = cast<StringLiteral>(expr); 9909 9910 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9911 AsmString, StartLoc, 9912 EndLoc); 9913 CurContext->addDecl(New); 9914 return New; 9915} 9916 9917DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, ModuleIdPath Path) { 9918 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9919 Module::AllVisible, 9920 /*IsIncludeDirective=*/false); 9921 if (!Mod) 9922 return true; 9923 9924 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9925 Module *ModCheck = Mod; 9926 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9927 // If we've run out of module parents, just drop the remaining identifiers. 9928 // We need the length to be consistent. 9929 if (!ModCheck) 9930 break; 9931 ModCheck = ModCheck->Parent; 9932 9933 IdentifierLocs.push_back(Path[I].second); 9934 } 9935 9936 ImportDecl *Import = ImportDecl::Create(Context, 9937 Context.getTranslationUnitDecl(), 9938 ImportLoc, Mod, 9939 IdentifierLocs); 9940 Context.getTranslationUnitDecl()->addDecl(Import); 9941 return Import; 9942} 9943 9944void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9945 SourceLocation PragmaLoc, 9946 SourceLocation NameLoc) { 9947 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9948 9949 if (PrevDecl) { 9950 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9951 } else { 9952 (void)WeakUndeclaredIdentifiers.insert( 9953 std::pair<IdentifierInfo*,WeakInfo> 9954 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9955 } 9956} 9957 9958void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9959 IdentifierInfo* AliasName, 9960 SourceLocation PragmaLoc, 9961 SourceLocation NameLoc, 9962 SourceLocation AliasNameLoc) { 9963 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9964 LookupOrdinaryName); 9965 WeakInfo W = WeakInfo(Name, NameLoc); 9966 9967 if (PrevDecl) { 9968 if (!PrevDecl->hasAttr<AliasAttr>()) 9969 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9970 DeclApplyPragmaWeak(TUScope, ND, W); 9971 } else { 9972 (void)WeakUndeclaredIdentifiers.insert( 9973 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9974 } 9975} 9976 9977Decl *Sema::getObjCDeclContext() const { 9978 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9979} 9980 9981AvailabilityResult Sema::getCurContextAvailability() const { 9982 const Decl *D = cast<Decl>(getCurLexicalContext()); 9983 // A category implicitly has the availability of the interface. 9984 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9985 D = CatD->getClassInterface(); 9986 9987 return D->getAvailability(); 9988} 9989