SemaDecl.cpp revision ec3bd728cc6505c98543b001a1988c237f5fb9a9
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo, 74 IdentifierInfo **CorrectedII) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 if (CorrectedII) { 150 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 151 Kind, S, SS, 0, false, 152 Sema::CTC_Type); 153 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 154 TemplateTy Template; 155 bool MemberOfUnknownSpecialization; 156 UnqualifiedId TemplateName; 157 TemplateName.setIdentifier(NewII, NameLoc); 158 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 159 CXXScopeSpec NewSS, *NewSSPtr = SS; 160 if (SS && NNS) { 161 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 162 NewSSPtr = &NewSS; 163 } 164 if (Correction && (NNS || NewII != &II) && 165 // Ignore a correction to a template type as the to-be-corrected 166 // identifier is not a template (typo correction for template names 167 // is handled elsewhere). 168 !(getLangOptions().CPlusPlus && NewSSPtr && 169 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 170 false, Template, MemberOfUnknownSpecialization))) { 171 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 172 isClassName, HasTrailingDot, ObjectTypePtr, 173 WantNontrivialTypeSourceInfo); 174 if (Ty) { 175 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 176 std::string CorrectedQuotedStr( 177 Correction.getQuoted(getLangOptions())); 178 Diag(NameLoc, diag::err_unknown_typename_suggest) 179 << Result.getLookupName() << CorrectedQuotedStr 180 << FixItHint::CreateReplacement(SourceRange(NameLoc), 181 CorrectedStr); 182 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 183 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 184 << CorrectedQuotedStr; 185 186 if (SS && NNS) 187 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 *CorrectedII = NewII; 189 return Ty; 190 } 191 } 192 } 193 // If typo correction failed or was not performed, fall through 194 case LookupResult::FoundOverloaded: 195 case LookupResult::FoundUnresolvedValue: 196 Result.suppressDiagnostics(); 197 return ParsedType(); 198 199 case LookupResult::Ambiguous: 200 // Recover from type-hiding ambiguities by hiding the type. We'll 201 // do the lookup again when looking for an object, and we can 202 // diagnose the error then. If we don't do this, then the error 203 // about hiding the type will be immediately followed by an error 204 // that only makes sense if the identifier was treated like a type. 205 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 206 Result.suppressDiagnostics(); 207 return ParsedType(); 208 } 209 210 // Look to see if we have a type anywhere in the list of results. 211 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 212 Res != ResEnd; ++Res) { 213 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 214 if (!IIDecl || 215 (*Res)->getLocation().getRawEncoding() < 216 IIDecl->getLocation().getRawEncoding()) 217 IIDecl = *Res; 218 } 219 } 220 221 if (!IIDecl) { 222 // None of the entities we found is a type, so there is no way 223 // to even assume that the result is a type. In this case, don't 224 // complain about the ambiguity. The parser will either try to 225 // perform this lookup again (e.g., as an object name), which 226 // will produce the ambiguity, or will complain that it expected 227 // a type name. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 232 // We found a type within the ambiguous lookup; diagnose the 233 // ambiguity and then return that type. This might be the right 234 // answer, or it might not be, but it suppresses any attempt to 235 // perform the name lookup again. 236 break; 237 238 case LookupResult::Found: 239 IIDecl = Result.getFoundDecl(); 240 break; 241 } 242 243 assert(IIDecl && "Didn't find decl"); 244 245 QualType T; 246 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 247 DiagnoseUseOfDecl(IIDecl, NameLoc); 248 249 if (T.isNull()) 250 T = Context.getTypeDeclType(TD); 251 252 if (SS && SS->isNotEmpty()) { 253 if (WantNontrivialTypeSourceInfo) { 254 // Construct a type with type-source information. 255 TypeLocBuilder Builder; 256 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 257 258 T = getElaboratedType(ETK_None, *SS, T); 259 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 260 ElabTL.setKeywordLoc(SourceLocation()); 261 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 262 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 263 } else { 264 T = getElaboratedType(ETK_None, *SS, T); 265 } 266 } 267 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 268 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 269 if (!HasTrailingDot) 270 T = Context.getObjCInterfaceType(IDecl); 271 } 272 273 if (T.isNull()) { 274 // If it's not plausibly a type, suppress diagnostics. 275 Result.suppressDiagnostics(); 276 return ParsedType(); 277 } 278 return ParsedType::make(T); 279} 280 281/// isTagName() - This method is called *for error recovery purposes only* 282/// to determine if the specified name is a valid tag name ("struct foo"). If 283/// so, this returns the TST for the tag corresponding to it (TST_enum, 284/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 285/// where the user forgot to specify the tag. 286DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 287 // Do a tag name lookup in this scope. 288 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 289 LookupName(R, S, false); 290 R.suppressDiagnostics(); 291 if (R.getResultKind() == LookupResult::Found) 292 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 293 switch (TD->getTagKind()) { 294 default: return DeclSpec::TST_unspecified; 295 case TTK_Struct: return DeclSpec::TST_struct; 296 case TTK_Union: return DeclSpec::TST_union; 297 case TTK_Class: return DeclSpec::TST_class; 298 case TTK_Enum: return DeclSpec::TST_enum; 299 } 300 } 301 302 return DeclSpec::TST_unspecified; 303} 304 305/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 306/// if a CXXScopeSpec's type is equal to the type of one of the base classes 307/// then downgrade the missing typename error to a warning. 308/// This is needed for MSVC compatibility; Example: 309/// @code 310/// template<class T> class A { 311/// public: 312/// typedef int TYPE; 313/// }; 314/// template<class T> class B : public A<T> { 315/// public: 316/// A<T>::TYPE a; // no typename required because A<T> is a base class. 317/// }; 318/// @endcode 319bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 320 if (CurContext->isRecord()) { 321 const Type *Ty = SS->getScopeRep()->getAsType(); 322 323 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 324 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 325 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 326 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 327 return true; 328 return S->isFunctionPrototypeScope(); 329 } 330 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 331} 332 333bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 334 SourceLocation IILoc, 335 Scope *S, 336 CXXScopeSpec *SS, 337 ParsedType &SuggestedType) { 338 // We don't have anything to suggest (yet). 339 SuggestedType = ParsedType(); 340 341 // There may have been a typo in the name of the type. Look up typo 342 // results, in case we have something that we can suggest. 343 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 344 LookupOrdinaryName, S, SS, NULL, 345 false, CTC_Type)) { 346 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 347 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 348 349 if (Corrected.isKeyword()) { 350 // We corrected to a keyword. 351 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 352 Diag(IILoc, diag::err_unknown_typename_suggest) 353 << &II << CorrectedQuotedStr; 354 return true; 355 } else { 356 NamedDecl *Result = Corrected.getCorrectionDecl(); 357 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 358 !Result->isInvalidDecl()) { 359 // We found a similarly-named type or interface; suggest that. 360 if (!SS || !SS->isSet()) 361 Diag(IILoc, diag::err_unknown_typename_suggest) 362 << &II << CorrectedQuotedStr 363 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 364 else if (DeclContext *DC = computeDeclContext(*SS, false)) 365 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 366 << &II << DC << CorrectedQuotedStr << SS->getRange() 367 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 368 else 369 llvm_unreachable("could not have corrected a typo here"); 370 371 Diag(Result->getLocation(), diag::note_previous_decl) 372 << CorrectedQuotedStr; 373 374 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 375 false, false, ParsedType(), 376 /*NonTrivialTypeSourceInfo=*/true); 377 return true; 378 } 379 } 380 } 381 382 if (getLangOptions().CPlusPlus) { 383 // See if II is a class template that the user forgot to pass arguments to. 384 UnqualifiedId Name; 385 Name.setIdentifier(&II, IILoc); 386 CXXScopeSpec EmptySS; 387 TemplateTy TemplateResult; 388 bool MemberOfUnknownSpecialization; 389 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 390 Name, ParsedType(), true, TemplateResult, 391 MemberOfUnknownSpecialization) == TNK_Type_template) { 392 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 393 Diag(IILoc, diag::err_template_missing_args) << TplName; 394 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 395 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 396 << TplDecl->getTemplateParameters()->getSourceRange(); 397 } 398 return true; 399 } 400 } 401 402 // FIXME: Should we move the logic that tries to recover from a missing tag 403 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 404 405 if (!SS || (!SS->isSet() && !SS->isInvalid())) 406 Diag(IILoc, diag::err_unknown_typename) << &II; 407 else if (DeclContext *DC = computeDeclContext(*SS, false)) 408 Diag(IILoc, diag::err_typename_nested_not_found) 409 << &II << DC << SS->getRange(); 410 else if (isDependentScopeSpecifier(*SS)) { 411 unsigned DiagID = diag::err_typename_missing; 412 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 413 DiagID = diag::warn_typename_missing; 414 415 Diag(SS->getRange().getBegin(), DiagID) 416 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 417 << SourceRange(SS->getRange().getBegin(), IILoc) 418 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 419 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 420 .get(); 421 } else { 422 assert(SS && SS->isInvalid() && 423 "Invalid scope specifier has already been diagnosed"); 424 } 425 426 return true; 427} 428 429/// \brief Determine whether the given result set contains either a type name 430/// or 431static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 433 NextToken.is(tok::less); 434 435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 437 return true; 438 439 if (CheckTemplate && isa<TemplateDecl>(*I)) 440 return true; 441 } 442 443 return false; 444} 445 446Sema::NameClassification Sema::ClassifyName(Scope *S, 447 CXXScopeSpec &SS, 448 IdentifierInfo *&Name, 449 SourceLocation NameLoc, 450 const Token &NextToken) { 451 DeclarationNameInfo NameInfo(Name, NameLoc); 452 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 453 454 if (NextToken.is(tok::coloncolon)) { 455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 456 QualType(), false, SS, 0, false); 457 458 } 459 460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 461 LookupParsedName(Result, S, &SS, !CurMethod); 462 463 // Perform lookup for Objective-C instance variables (including automatically 464 // synthesized instance variables), if we're in an Objective-C method. 465 // FIXME: This lookup really, really needs to be folded in to the normal 466 // unqualified lookup mechanism. 467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 468 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 469 if (E.get() || E.isInvalid()) 470 return E; 471 } 472 473 bool SecondTry = false; 474 bool IsFilteredTemplateName = false; 475 476Corrected: 477 switch (Result.getResultKind()) { 478 case LookupResult::NotFound: 479 // If an unqualified-id is followed by a '(', then we have a function 480 // call. 481 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 482 // In C++, this is an ADL-only call. 483 // FIXME: Reference? 484 if (getLangOptions().CPlusPlus) 485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 486 487 // C90 6.3.2.2: 488 // If the expression that precedes the parenthesized argument list in a 489 // function call consists solely of an identifier, and if no 490 // declaration is visible for this identifier, the identifier is 491 // implicitly declared exactly as if, in the innermost block containing 492 // the function call, the declaration 493 // 494 // extern int identifier (); 495 // 496 // appeared. 497 // 498 // We also allow this in C99 as an extension. 499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 500 Result.addDecl(D); 501 Result.resolveKind(); 502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 503 } 504 } 505 506 // In C, we first see whether there is a tag type by the same name, in 507 // which case it's likely that the user just forget to write "enum", 508 // "struct", or "union". 509 if (!getLangOptions().CPlusPlus && !SecondTry) { 510 Result.clear(LookupTagName); 511 LookupParsedName(Result, S, &SS); 512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 513 const char *TagName = 0; 514 const char *FixItTagName = 0; 515 switch (Tag->getTagKind()) { 516 case TTK_Class: 517 TagName = "class"; 518 FixItTagName = "class "; 519 break; 520 521 case TTK_Enum: 522 TagName = "enum"; 523 FixItTagName = "enum "; 524 break; 525 526 case TTK_Struct: 527 TagName = "struct"; 528 FixItTagName = "struct "; 529 break; 530 531 case TTK_Union: 532 TagName = "union"; 533 FixItTagName = "union "; 534 break; 535 } 536 537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 538 << Name << TagName << getLangOptions().CPlusPlus 539 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 540 break; 541 } 542 543 Result.clear(LookupOrdinaryName); 544 } 545 546 // Perform typo correction to determine if there is another name that is 547 // close to this name. 548 if (!SecondTry) { 549 SecondTry = true; 550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 551 Result.getLookupKind(), S, 552 &SS)) { 553 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 554 unsigned QualifiedDiag = diag::err_no_member_suggest; 555 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 556 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 557 558 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 559 NamedDecl *UnderlyingFirstDecl 560 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 561 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 562 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 563 UnqualifiedDiag = diag::err_no_template_suggest; 564 QualifiedDiag = diag::err_no_member_template_suggest; 565 } else if (UnderlyingFirstDecl && 566 (isa<TypeDecl>(UnderlyingFirstDecl) || 567 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 568 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 569 UnqualifiedDiag = diag::err_unknown_typename_suggest; 570 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 571 } 572 573 if (SS.isEmpty()) 574 Diag(NameLoc, UnqualifiedDiag) 575 << Name << CorrectedQuotedStr 576 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 577 else 578 Diag(NameLoc, QualifiedDiag) 579 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 580 << SS.getRange() 581 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 582 583 // Update the name, so that the caller has the new name. 584 Name = Corrected.getCorrectionAsIdentifierInfo(); 585 586 // Also update the LookupResult... 587 // FIXME: This should probably go away at some point 588 Result.clear(); 589 Result.setLookupName(Corrected.getCorrection()); 590 if (FirstDecl) Result.addDecl(FirstDecl); 591 592 // Typo correction corrected to a keyword. 593 if (Corrected.isKeyword()) 594 return Corrected.getCorrectionAsIdentifierInfo(); 595 596 if (FirstDecl) 597 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 598 << CorrectedQuotedStr; 599 600 // If we found an Objective-C instance variable, let 601 // LookupInObjCMethod build the appropriate expression to 602 // reference the ivar. 603 // FIXME: This is a gross hack. 604 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 605 Result.clear(); 606 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 607 return move(E); 608 } 609 610 goto Corrected; 611 } 612 } 613 614 // We failed to correct; just fall through and let the parser deal with it. 615 Result.suppressDiagnostics(); 616 return NameClassification::Unknown(); 617 618 case LookupResult::NotFoundInCurrentInstantiation: 619 // We performed name lookup into the current instantiation, and there were 620 // dependent bases, so we treat this result the same way as any other 621 // dependent nested-name-specifier. 622 623 // C++ [temp.res]p2: 624 // A name used in a template declaration or definition and that is 625 // dependent on a template-parameter is assumed not to name a type 626 // unless the applicable name lookup finds a type name or the name is 627 // qualified by the keyword typename. 628 // 629 // FIXME: If the next token is '<', we might want to ask the parser to 630 // perform some heroics to see if we actually have a 631 // template-argument-list, which would indicate a missing 'template' 632 // keyword here. 633 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 634 635 case LookupResult::Found: 636 case LookupResult::FoundOverloaded: 637 case LookupResult::FoundUnresolvedValue: 638 break; 639 640 case LookupResult::Ambiguous: 641 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 642 hasAnyAcceptableTemplateNames(Result)) { 643 // C++ [temp.local]p3: 644 // A lookup that finds an injected-class-name (10.2) can result in an 645 // ambiguity in certain cases (for example, if it is found in more than 646 // one base class). If all of the injected-class-names that are found 647 // refer to specializations of the same class template, and if the name 648 // is followed by a template-argument-list, the reference refers to the 649 // class template itself and not a specialization thereof, and is not 650 // ambiguous. 651 // 652 // This filtering can make an ambiguous result into an unambiguous one, 653 // so try again after filtering out template names. 654 FilterAcceptableTemplateNames(Result); 655 if (!Result.isAmbiguous()) { 656 IsFilteredTemplateName = true; 657 break; 658 } 659 } 660 661 // Diagnose the ambiguity and return an error. 662 return NameClassification::Error(); 663 } 664 665 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 666 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 667 // C++ [temp.names]p3: 668 // After name lookup (3.4) finds that a name is a template-name or that 669 // an operator-function-id or a literal- operator-id refers to a set of 670 // overloaded functions any member of which is a function template if 671 // this is followed by a <, the < is always taken as the delimiter of a 672 // template-argument-list and never as the less-than operator. 673 if (!IsFilteredTemplateName) 674 FilterAcceptableTemplateNames(Result); 675 676 if (!Result.empty()) { 677 bool IsFunctionTemplate; 678 TemplateName Template; 679 if (Result.end() - Result.begin() > 1) { 680 IsFunctionTemplate = true; 681 Template = Context.getOverloadedTemplateName(Result.begin(), 682 Result.end()); 683 } else { 684 TemplateDecl *TD 685 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 686 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 687 688 if (SS.isSet() && !SS.isInvalid()) 689 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 690 /*TemplateKeyword=*/false, 691 TD); 692 else 693 Template = TemplateName(TD); 694 } 695 696 if (IsFunctionTemplate) { 697 // Function templates always go through overload resolution, at which 698 // point we'll perform the various checks (e.g., accessibility) we need 699 // to based on which function we selected. 700 Result.suppressDiagnostics(); 701 702 return NameClassification::FunctionTemplate(Template); 703 } 704 705 return NameClassification::TypeTemplate(Template); 706 } 707 } 708 709 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 710 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 711 DiagnoseUseOfDecl(Type, NameLoc); 712 QualType T = Context.getTypeDeclType(Type); 713 return ParsedType::make(T); 714 } 715 716 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 717 if (!Class) { 718 // FIXME: It's unfortunate that we don't have a Type node for handling this. 719 if (ObjCCompatibleAliasDecl *Alias 720 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 721 Class = Alias->getClassInterface(); 722 } 723 724 if (Class) { 725 DiagnoseUseOfDecl(Class, NameLoc); 726 727 if (NextToken.is(tok::period)) { 728 // Interface. <something> is parsed as a property reference expression. 729 // Just return "unknown" as a fall-through for now. 730 Result.suppressDiagnostics(); 731 return NameClassification::Unknown(); 732 } 733 734 QualType T = Context.getObjCInterfaceType(Class); 735 return ParsedType::make(T); 736 } 737 738 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 739 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 740 741 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 742 return BuildDeclarationNameExpr(SS, Result, ADL); 743} 744 745// Determines the context to return to after temporarily entering a 746// context. This depends in an unnecessarily complicated way on the 747// exact ordering of callbacks from the parser. 748DeclContext *Sema::getContainingDC(DeclContext *DC) { 749 750 // Functions defined inline within classes aren't parsed until we've 751 // finished parsing the top-level class, so the top-level class is 752 // the context we'll need to return to. 753 if (isa<FunctionDecl>(DC)) { 754 DC = DC->getLexicalParent(); 755 756 // A function not defined within a class will always return to its 757 // lexical context. 758 if (!isa<CXXRecordDecl>(DC)) 759 return DC; 760 761 // A C++ inline method/friend is parsed *after* the topmost class 762 // it was declared in is fully parsed ("complete"); the topmost 763 // class is the context we need to return to. 764 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 765 DC = RD; 766 767 // Return the declaration context of the topmost class the inline method is 768 // declared in. 769 return DC; 770 } 771 772 return DC->getLexicalParent(); 773} 774 775void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 776 assert(getContainingDC(DC) == CurContext && 777 "The next DeclContext should be lexically contained in the current one."); 778 CurContext = DC; 779 S->setEntity(DC); 780} 781 782void Sema::PopDeclContext() { 783 assert(CurContext && "DeclContext imbalance!"); 784 785 CurContext = getContainingDC(CurContext); 786 assert(CurContext && "Popped translation unit!"); 787} 788 789/// EnterDeclaratorContext - Used when we must lookup names in the context 790/// of a declarator's nested name specifier. 791/// 792void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 793 // C++0x [basic.lookup.unqual]p13: 794 // A name used in the definition of a static data member of class 795 // X (after the qualified-id of the static member) is looked up as 796 // if the name was used in a member function of X. 797 // C++0x [basic.lookup.unqual]p14: 798 // If a variable member of a namespace is defined outside of the 799 // scope of its namespace then any name used in the definition of 800 // the variable member (after the declarator-id) is looked up as 801 // if the definition of the variable member occurred in its 802 // namespace. 803 // Both of these imply that we should push a scope whose context 804 // is the semantic context of the declaration. We can't use 805 // PushDeclContext here because that context is not necessarily 806 // lexically contained in the current context. Fortunately, 807 // the containing scope should have the appropriate information. 808 809 assert(!S->getEntity() && "scope already has entity"); 810 811#ifndef NDEBUG 812 Scope *Ancestor = S->getParent(); 813 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 814 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 815#endif 816 817 CurContext = DC; 818 S->setEntity(DC); 819} 820 821void Sema::ExitDeclaratorContext(Scope *S) { 822 assert(S->getEntity() == CurContext && "Context imbalance!"); 823 824 // Switch back to the lexical context. The safety of this is 825 // enforced by an assert in EnterDeclaratorContext. 826 Scope *Ancestor = S->getParent(); 827 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 828 CurContext = (DeclContext*) Ancestor->getEntity(); 829 830 // We don't need to do anything with the scope, which is going to 831 // disappear. 832} 833 834 835void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 836 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 837 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 838 // We assume that the caller has already called 839 // ActOnReenterTemplateScope 840 FD = TFD->getTemplatedDecl(); 841 } 842 if (!FD) 843 return; 844 845 PushDeclContext(S, FD); 846 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 847 ParmVarDecl *Param = FD->getParamDecl(P); 848 // If the parameter has an identifier, then add it to the scope 849 if (Param->getIdentifier()) { 850 S->AddDecl(Param); 851 IdResolver.AddDecl(Param); 852 } 853 } 854} 855 856 857/// \brief Determine whether we allow overloading of the function 858/// PrevDecl with another declaration. 859/// 860/// This routine determines whether overloading is possible, not 861/// whether some new function is actually an overload. It will return 862/// true in C++ (where we can always provide overloads) or, as an 863/// extension, in C when the previous function is already an 864/// overloaded function declaration or has the "overloadable" 865/// attribute. 866static bool AllowOverloadingOfFunction(LookupResult &Previous, 867 ASTContext &Context) { 868 if (Context.getLangOptions().CPlusPlus) 869 return true; 870 871 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 872 return true; 873 874 return (Previous.getResultKind() == LookupResult::Found 875 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 876} 877 878/// Add this decl to the scope shadowed decl chains. 879void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 880 // Move up the scope chain until we find the nearest enclosing 881 // non-transparent context. The declaration will be introduced into this 882 // scope. 883 while (S->getEntity() && 884 ((DeclContext *)S->getEntity())->isTransparentContext()) 885 S = S->getParent(); 886 887 // Add scoped declarations into their context, so that they can be 888 // found later. Declarations without a context won't be inserted 889 // into any context. 890 if (AddToContext) 891 CurContext->addDecl(D); 892 893 // Out-of-line definitions shouldn't be pushed into scope in C++. 894 // Out-of-line variable and function definitions shouldn't even in C. 895 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 896 D->isOutOfLine() && 897 !D->getDeclContext()->getRedeclContext()->Equals( 898 D->getLexicalDeclContext()->getRedeclContext())) 899 return; 900 901 // Template instantiations should also not be pushed into scope. 902 if (isa<FunctionDecl>(D) && 903 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 904 return; 905 906 // If this replaces anything in the current scope, 907 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 908 IEnd = IdResolver.end(); 909 for (; I != IEnd; ++I) { 910 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 911 S->RemoveDecl(*I); 912 IdResolver.RemoveDecl(*I); 913 914 // Should only need to replace one decl. 915 break; 916 } 917 } 918 919 S->AddDecl(D); 920 921 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 922 // Implicitly-generated labels may end up getting generated in an order that 923 // isn't strictly lexical, which breaks name lookup. Be careful to insert 924 // the label at the appropriate place in the identifier chain. 925 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 926 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 927 if (IDC == CurContext) { 928 if (!S->isDeclScope(*I)) 929 continue; 930 } else if (IDC->Encloses(CurContext)) 931 break; 932 } 933 934 IdResolver.InsertDeclAfter(I, D); 935 } else { 936 IdResolver.AddDecl(D); 937 } 938} 939 940void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 941 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 942 TUScope->AddDecl(D); 943} 944 945bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 946 bool ExplicitInstantiationOrSpecialization) { 947 return IdResolver.isDeclInScope(D, Ctx, Context, S, 948 ExplicitInstantiationOrSpecialization); 949} 950 951Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 952 DeclContext *TargetDC = DC->getPrimaryContext(); 953 do { 954 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 955 if (ScopeDC->getPrimaryContext() == TargetDC) 956 return S; 957 } while ((S = S->getParent())); 958 959 return 0; 960} 961 962static bool isOutOfScopePreviousDeclaration(NamedDecl *, 963 DeclContext*, 964 ASTContext&); 965 966/// Filters out lookup results that don't fall within the given scope 967/// as determined by isDeclInScope. 968void Sema::FilterLookupForScope(LookupResult &R, 969 DeclContext *Ctx, Scope *S, 970 bool ConsiderLinkage, 971 bool ExplicitInstantiationOrSpecialization) { 972 LookupResult::Filter F = R.makeFilter(); 973 while (F.hasNext()) { 974 NamedDecl *D = F.next(); 975 976 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 977 continue; 978 979 if (ConsiderLinkage && 980 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 981 continue; 982 983 F.erase(); 984 } 985 986 F.done(); 987} 988 989static bool isUsingDecl(NamedDecl *D) { 990 return isa<UsingShadowDecl>(D) || 991 isa<UnresolvedUsingTypenameDecl>(D) || 992 isa<UnresolvedUsingValueDecl>(D); 993} 994 995/// Removes using shadow declarations from the lookup results. 996static void RemoveUsingDecls(LookupResult &R) { 997 LookupResult::Filter F = R.makeFilter(); 998 while (F.hasNext()) 999 if (isUsingDecl(F.next())) 1000 F.erase(); 1001 1002 F.done(); 1003} 1004 1005/// \brief Check for this common pattern: 1006/// @code 1007/// class S { 1008/// S(const S&); // DO NOT IMPLEMENT 1009/// void operator=(const S&); // DO NOT IMPLEMENT 1010/// }; 1011/// @endcode 1012static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1013 // FIXME: Should check for private access too but access is set after we get 1014 // the decl here. 1015 if (D->doesThisDeclarationHaveABody()) 1016 return false; 1017 1018 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1019 return CD->isCopyConstructor(); 1020 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1021 return Method->isCopyAssignmentOperator(); 1022 return false; 1023} 1024 1025bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1026 assert(D); 1027 1028 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1029 return false; 1030 1031 // Ignore class templates. 1032 if (D->getDeclContext()->isDependentContext() || 1033 D->getLexicalDeclContext()->isDependentContext()) 1034 return false; 1035 1036 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1037 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1038 return false; 1039 1040 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1041 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1042 return false; 1043 } else { 1044 // 'static inline' functions are used in headers; don't warn. 1045 if (FD->getStorageClass() == SC_Static && 1046 FD->isInlineSpecified()) 1047 return false; 1048 } 1049 1050 if (FD->doesThisDeclarationHaveABody() && 1051 Context.DeclMustBeEmitted(FD)) 1052 return false; 1053 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1054 if (!VD->isFileVarDecl() || 1055 VD->getType().isConstant(Context) || 1056 Context.DeclMustBeEmitted(VD)) 1057 return false; 1058 1059 if (VD->isStaticDataMember() && 1060 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1061 return false; 1062 1063 } else { 1064 return false; 1065 } 1066 1067 // Only warn for unused decls internal to the translation unit. 1068 if (D->getLinkage() == ExternalLinkage) 1069 return false; 1070 1071 return true; 1072} 1073 1074void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1075 if (!D) 1076 return; 1077 1078 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1079 const FunctionDecl *First = FD->getFirstDeclaration(); 1080 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1085 const VarDecl *First = VD->getFirstDeclaration(); 1086 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1087 return; // First should already be in the vector. 1088 } 1089 1090 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1091 UnusedFileScopedDecls.push_back(D); 1092 } 1093 1094static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1095 if (D->isInvalidDecl()) 1096 return false; 1097 1098 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1099 return false; 1100 1101 if (isa<LabelDecl>(D)) 1102 return true; 1103 1104 // White-list anything that isn't a local variable. 1105 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1106 !D->getDeclContext()->isFunctionOrMethod()) 1107 return false; 1108 1109 // Types of valid local variables should be complete, so this should succeed. 1110 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1111 1112 // White-list anything with an __attribute__((unused)) type. 1113 QualType Ty = VD->getType(); 1114 1115 // Only look at the outermost level of typedef. 1116 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1117 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1118 return false; 1119 } 1120 1121 // If we failed to complete the type for some reason, or if the type is 1122 // dependent, don't diagnose the variable. 1123 if (Ty->isIncompleteType() || Ty->isDependentType()) 1124 return false; 1125 1126 if (const TagType *TT = Ty->getAs<TagType>()) { 1127 const TagDecl *Tag = TT->getDecl(); 1128 if (Tag->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1132 if (!RD->hasTrivialDestructor()) 1133 return false; 1134 1135 if (const Expr *Init = VD->getInit()) { 1136 const CXXConstructExpr *Construct = 1137 dyn_cast<CXXConstructExpr>(Init); 1138 if (Construct && !Construct->isElidable()) { 1139 CXXConstructorDecl *CD = Construct->getConstructor(); 1140 if (!CD->isTrivial()) 1141 return false; 1142 } 1143 } 1144 } 1145 } 1146 1147 // TODO: __attribute__((unused)) templates? 1148 } 1149 1150 return true; 1151} 1152 1153static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1154 FixItHint &Hint) { 1155 if (isa<LabelDecl>(D)) { 1156 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1157 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1158 if (AfterColon.isInvalid()) 1159 return; 1160 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1161 getCharRange(D->getLocStart(), AfterColon)); 1162 } 1163 return; 1164} 1165 1166/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1167/// unless they are marked attr(unused). 1168void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1169 FixItHint Hint; 1170 if (!ShouldDiagnoseUnusedDecl(D)) 1171 return; 1172 1173 GenerateFixForUnusedDecl(D, Context, Hint); 1174 1175 unsigned DiagID; 1176 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1177 DiagID = diag::warn_unused_exception_param; 1178 else if (isa<LabelDecl>(D)) 1179 DiagID = diag::warn_unused_label; 1180 else 1181 DiagID = diag::warn_unused_variable; 1182 1183 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1184} 1185 1186static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1187 // Verify that we have no forward references left. If so, there was a goto 1188 // or address of a label taken, but no definition of it. Label fwd 1189 // definitions are indicated with a null substmt. 1190 if (L->getStmt() == 0) 1191 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1192} 1193 1194void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1195 if (S->decl_empty()) return; 1196 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1197 "Scope shouldn't contain decls!"); 1198 1199 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1200 I != E; ++I) { 1201 Decl *TmpD = (*I); 1202 assert(TmpD && "This decl didn't get pushed??"); 1203 1204 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1205 NamedDecl *D = cast<NamedDecl>(TmpD); 1206 1207 if (!D->getDeclName()) continue; 1208 1209 // Diagnose unused variables in this scope. 1210 if (!S->hasErrorOccurred()) 1211 DiagnoseUnusedDecl(D); 1212 1213 // If this was a forward reference to a label, verify it was defined. 1214 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1215 CheckPoppedLabel(LD, *this); 1216 1217 // Remove this name from our lexical scope. 1218 IdResolver.RemoveDecl(D); 1219 } 1220} 1221 1222/// \brief Look for an Objective-C class in the translation unit. 1223/// 1224/// \param Id The name of the Objective-C class we're looking for. If 1225/// typo-correction fixes this name, the Id will be updated 1226/// to the fixed name. 1227/// 1228/// \param IdLoc The location of the name in the translation unit. 1229/// 1230/// \param TypoCorrection If true, this routine will attempt typo correction 1231/// if there is no class with the given name. 1232/// 1233/// \returns The declaration of the named Objective-C class, or NULL if the 1234/// class could not be found. 1235ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1236 SourceLocation IdLoc, 1237 bool DoTypoCorrection) { 1238 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1239 // creation from this context. 1240 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1241 1242 if (!IDecl && DoTypoCorrection) { 1243 // Perform typo correction at the given location, but only if we 1244 // find an Objective-C class name. 1245 TypoCorrection C; 1246 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1247 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1248 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1249 Diag(IdLoc, diag::err_undef_interface_suggest) 1250 << Id << IDecl->getDeclName() 1251 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1252 Diag(IDecl->getLocation(), diag::note_previous_decl) 1253 << IDecl->getDeclName(); 1254 1255 Id = IDecl->getIdentifier(); 1256 } 1257 } 1258 1259 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1260} 1261 1262/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1263/// from S, where a non-field would be declared. This routine copes 1264/// with the difference between C and C++ scoping rules in structs and 1265/// unions. For example, the following code is well-formed in C but 1266/// ill-formed in C++: 1267/// @code 1268/// struct S6 { 1269/// enum { BAR } e; 1270/// }; 1271/// 1272/// void test_S6() { 1273/// struct S6 a; 1274/// a.e = BAR; 1275/// } 1276/// @endcode 1277/// For the declaration of BAR, this routine will return a different 1278/// scope. The scope S will be the scope of the unnamed enumeration 1279/// within S6. In C++, this routine will return the scope associated 1280/// with S6, because the enumeration's scope is a transparent 1281/// context but structures can contain non-field names. In C, this 1282/// routine will return the translation unit scope, since the 1283/// enumeration's scope is a transparent context and structures cannot 1284/// contain non-field names. 1285Scope *Sema::getNonFieldDeclScope(Scope *S) { 1286 while (((S->getFlags() & Scope::DeclScope) == 0) || 1287 (S->getEntity() && 1288 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1289 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1290 S = S->getParent(); 1291 return S; 1292} 1293 1294/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1295/// file scope. lazily create a decl for it. ForRedeclaration is true 1296/// if we're creating this built-in in anticipation of redeclaring the 1297/// built-in. 1298NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1299 Scope *S, bool ForRedeclaration, 1300 SourceLocation Loc) { 1301 Builtin::ID BID = (Builtin::ID)bid; 1302 1303 ASTContext::GetBuiltinTypeError Error; 1304 QualType R = Context.GetBuiltinType(BID, Error); 1305 switch (Error) { 1306 case ASTContext::GE_None: 1307 // Okay 1308 break; 1309 1310 case ASTContext::GE_Missing_stdio: 1311 if (ForRedeclaration) 1312 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1313 << Context.BuiltinInfo.GetName(BID); 1314 return 0; 1315 1316 case ASTContext::GE_Missing_setjmp: 1317 if (ForRedeclaration) 1318 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1319 << Context.BuiltinInfo.GetName(BID); 1320 return 0; 1321 1322 case ASTContext::GE_Missing_ucontext: 1323 if (ForRedeclaration) 1324 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1325 << Context.BuiltinInfo.GetName(BID); 1326 return 0; 1327 } 1328 1329 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1330 Diag(Loc, diag::ext_implicit_lib_function_decl) 1331 << Context.BuiltinInfo.GetName(BID) 1332 << R; 1333 if (Context.BuiltinInfo.getHeaderName(BID) && 1334 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1335 != DiagnosticsEngine::Ignored) 1336 Diag(Loc, diag::note_please_include_header) 1337 << Context.BuiltinInfo.getHeaderName(BID) 1338 << Context.BuiltinInfo.GetName(BID); 1339 } 1340 1341 FunctionDecl *New = FunctionDecl::Create(Context, 1342 Context.getTranslationUnitDecl(), 1343 Loc, Loc, II, R, /*TInfo=*/0, 1344 SC_Extern, 1345 SC_None, false, 1346 /*hasPrototype=*/true); 1347 New->setImplicit(); 1348 1349 // Create Decl objects for each parameter, adding them to the 1350 // FunctionDecl. 1351 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1352 SmallVector<ParmVarDecl*, 16> Params; 1353 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1354 ParmVarDecl *parm = 1355 ParmVarDecl::Create(Context, New, SourceLocation(), 1356 SourceLocation(), 0, 1357 FT->getArgType(i), /*TInfo=*/0, 1358 SC_None, SC_None, 0); 1359 parm->setScopeInfo(0, i); 1360 Params.push_back(parm); 1361 } 1362 New->setParams(Params); 1363 } 1364 1365 AddKnownFunctionAttributes(New); 1366 1367 // TUScope is the translation-unit scope to insert this function into. 1368 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1369 // relate Scopes to DeclContexts, and probably eliminate CurContext 1370 // entirely, but we're not there yet. 1371 DeclContext *SavedContext = CurContext; 1372 CurContext = Context.getTranslationUnitDecl(); 1373 PushOnScopeChains(New, TUScope); 1374 CurContext = SavedContext; 1375 return New; 1376} 1377 1378bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1379 QualType OldType; 1380 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1381 OldType = OldTypedef->getUnderlyingType(); 1382 else 1383 OldType = Context.getTypeDeclType(Old); 1384 QualType NewType = New->getUnderlyingType(); 1385 1386 if (NewType->isVariablyModifiedType()) { 1387 // Must not redefine a typedef with a variably-modified type. 1388 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1389 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1390 << Kind << NewType; 1391 if (Old->getLocation().isValid()) 1392 Diag(Old->getLocation(), diag::note_previous_definition); 1393 New->setInvalidDecl(); 1394 return true; 1395 } 1396 1397 if (OldType != NewType && 1398 !OldType->isDependentType() && 1399 !NewType->isDependentType() && 1400 !Context.hasSameType(OldType, NewType)) { 1401 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1402 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1403 << Kind << NewType << OldType; 1404 if (Old->getLocation().isValid()) 1405 Diag(Old->getLocation(), diag::note_previous_definition); 1406 New->setInvalidDecl(); 1407 return true; 1408 } 1409 return false; 1410} 1411 1412/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1413/// same name and scope as a previous declaration 'Old'. Figure out 1414/// how to resolve this situation, merging decls or emitting 1415/// diagnostics as appropriate. If there was an error, set New to be invalid. 1416/// 1417void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1418 // If the new decl is known invalid already, don't bother doing any 1419 // merging checks. 1420 if (New->isInvalidDecl()) return; 1421 1422 // Allow multiple definitions for ObjC built-in typedefs. 1423 // FIXME: Verify the underlying types are equivalent! 1424 if (getLangOptions().ObjC1) { 1425 const IdentifierInfo *TypeID = New->getIdentifier(); 1426 switch (TypeID->getLength()) { 1427 default: break; 1428 case 2: 1429 if (!TypeID->isStr("id")) 1430 break; 1431 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1432 // Install the built-in type for 'id', ignoring the current definition. 1433 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1434 return; 1435 case 5: 1436 if (!TypeID->isStr("Class")) 1437 break; 1438 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1439 // Install the built-in type for 'Class', ignoring the current definition. 1440 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1441 return; 1442 case 3: 1443 if (!TypeID->isStr("SEL")) 1444 break; 1445 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1446 // Install the built-in type for 'SEL', ignoring the current definition. 1447 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1448 return; 1449 } 1450 // Fall through - the typedef name was not a builtin type. 1451 } 1452 1453 // Verify the old decl was also a type. 1454 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1455 if (!Old) { 1456 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1457 << New->getDeclName(); 1458 1459 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1460 if (OldD->getLocation().isValid()) 1461 Diag(OldD->getLocation(), diag::note_previous_definition); 1462 1463 return New->setInvalidDecl(); 1464 } 1465 1466 // If the old declaration is invalid, just give up here. 1467 if (Old->isInvalidDecl()) 1468 return New->setInvalidDecl(); 1469 1470 // If the typedef types are not identical, reject them in all languages and 1471 // with any extensions enabled. 1472 if (isIncompatibleTypedef(Old, New)) 1473 return; 1474 1475 // The types match. Link up the redeclaration chain if the old 1476 // declaration was a typedef. 1477 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1478 New->setPreviousDeclaration(Typedef); 1479 1480 if (getLangOptions().MicrosoftExt) 1481 return; 1482 1483 if (getLangOptions().CPlusPlus) { 1484 // C++ [dcl.typedef]p2: 1485 // In a given non-class scope, a typedef specifier can be used to 1486 // redefine the name of any type declared in that scope to refer 1487 // to the type to which it already refers. 1488 if (!isa<CXXRecordDecl>(CurContext)) 1489 return; 1490 1491 // C++0x [dcl.typedef]p4: 1492 // In a given class scope, a typedef specifier can be used to redefine 1493 // any class-name declared in that scope that is not also a typedef-name 1494 // to refer to the type to which it already refers. 1495 // 1496 // This wording came in via DR424, which was a correction to the 1497 // wording in DR56, which accidentally banned code like: 1498 // 1499 // struct S { 1500 // typedef struct A { } A; 1501 // }; 1502 // 1503 // in the C++03 standard. We implement the C++0x semantics, which 1504 // allow the above but disallow 1505 // 1506 // struct S { 1507 // typedef int I; 1508 // typedef int I; 1509 // }; 1510 // 1511 // since that was the intent of DR56. 1512 if (!isa<TypedefNameDecl>(Old)) 1513 return; 1514 1515 Diag(New->getLocation(), diag::err_redefinition) 1516 << New->getDeclName(); 1517 Diag(Old->getLocation(), diag::note_previous_definition); 1518 return New->setInvalidDecl(); 1519 } 1520 1521 // Modules always permit redefinition of typedefs, as does C11. 1522 if (getLangOptions().Modules || getLangOptions().C11) 1523 return; 1524 1525 // If we have a redefinition of a typedef in C, emit a warning. This warning 1526 // is normally mapped to an error, but can be controlled with 1527 // -Wtypedef-redefinition. If either the original or the redefinition is 1528 // in a system header, don't emit this for compatibility with GCC. 1529 if (getDiagnostics().getSuppressSystemWarnings() && 1530 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1531 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1532 return; 1533 1534 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1535 << New->getDeclName(); 1536 Diag(Old->getLocation(), diag::note_previous_definition); 1537 return; 1538} 1539 1540/// DeclhasAttr - returns true if decl Declaration already has the target 1541/// attribute. 1542static bool 1543DeclHasAttr(const Decl *D, const Attr *A) { 1544 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1545 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1546 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1547 if ((*i)->getKind() == A->getKind()) { 1548 if (Ann) { 1549 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1550 return true; 1551 continue; 1552 } 1553 // FIXME: Don't hardcode this check 1554 if (OA && isa<OwnershipAttr>(*i)) 1555 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1556 return true; 1557 } 1558 1559 return false; 1560} 1561 1562/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1563void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1564 bool MergeDeprecation) { 1565 if (!Old->hasAttrs()) 1566 return; 1567 1568 bool foundAny = New->hasAttrs(); 1569 1570 // Ensure that any moving of objects within the allocated map is done before 1571 // we process them. 1572 if (!foundAny) New->setAttrs(AttrVec()); 1573 1574 for (specific_attr_iterator<InheritableAttr> 1575 i = Old->specific_attr_begin<InheritableAttr>(), 1576 e = Old->specific_attr_end<InheritableAttr>(); 1577 i != e; ++i) { 1578 // Ignore deprecated/unavailable/availability attributes if requested. 1579 if (!MergeDeprecation && 1580 (isa<DeprecatedAttr>(*i) || 1581 isa<UnavailableAttr>(*i) || 1582 isa<AvailabilityAttr>(*i))) 1583 continue; 1584 1585 if (!DeclHasAttr(New, *i)) { 1586 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1587 newAttr->setInherited(true); 1588 New->addAttr(newAttr); 1589 foundAny = true; 1590 } 1591 } 1592 1593 if (!foundAny) New->dropAttrs(); 1594} 1595 1596/// mergeParamDeclAttributes - Copy attributes from the old parameter 1597/// to the new one. 1598static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1599 const ParmVarDecl *oldDecl, 1600 ASTContext &C) { 1601 if (!oldDecl->hasAttrs()) 1602 return; 1603 1604 bool foundAny = newDecl->hasAttrs(); 1605 1606 // Ensure that any moving of objects within the allocated map is 1607 // done before we process them. 1608 if (!foundAny) newDecl->setAttrs(AttrVec()); 1609 1610 for (specific_attr_iterator<InheritableParamAttr> 1611 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1612 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1613 if (!DeclHasAttr(newDecl, *i)) { 1614 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1615 newAttr->setInherited(true); 1616 newDecl->addAttr(newAttr); 1617 foundAny = true; 1618 } 1619 } 1620 1621 if (!foundAny) newDecl->dropAttrs(); 1622} 1623 1624namespace { 1625 1626/// Used in MergeFunctionDecl to keep track of function parameters in 1627/// C. 1628struct GNUCompatibleParamWarning { 1629 ParmVarDecl *OldParm; 1630 ParmVarDecl *NewParm; 1631 QualType PromotedType; 1632}; 1633 1634} 1635 1636/// getSpecialMember - get the special member enum for a method. 1637Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1638 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1639 if (Ctor->isDefaultConstructor()) 1640 return Sema::CXXDefaultConstructor; 1641 1642 if (Ctor->isCopyConstructor()) 1643 return Sema::CXXCopyConstructor; 1644 1645 if (Ctor->isMoveConstructor()) 1646 return Sema::CXXMoveConstructor; 1647 } else if (isa<CXXDestructorDecl>(MD)) { 1648 return Sema::CXXDestructor; 1649 } else if (MD->isCopyAssignmentOperator()) { 1650 return Sema::CXXCopyAssignment; 1651 } else if (MD->isMoveAssignmentOperator()) { 1652 return Sema::CXXMoveAssignment; 1653 } 1654 1655 return Sema::CXXInvalid; 1656} 1657 1658/// canRedefineFunction - checks if a function can be redefined. Currently, 1659/// only extern inline functions can be redefined, and even then only in 1660/// GNU89 mode. 1661static bool canRedefineFunction(const FunctionDecl *FD, 1662 const LangOptions& LangOpts) { 1663 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1664 !LangOpts.CPlusPlus && 1665 FD->isInlineSpecified() && 1666 FD->getStorageClass() == SC_Extern); 1667} 1668 1669/// MergeFunctionDecl - We just parsed a function 'New' from 1670/// declarator D which has the same name and scope as a previous 1671/// declaration 'Old'. Figure out how to resolve this situation, 1672/// merging decls or emitting diagnostics as appropriate. 1673/// 1674/// In C++, New and Old must be declarations that are not 1675/// overloaded. Use IsOverload to determine whether New and Old are 1676/// overloaded, and to select the Old declaration that New should be 1677/// merged with. 1678/// 1679/// Returns true if there was an error, false otherwise. 1680bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1681 // Verify the old decl was also a function. 1682 FunctionDecl *Old = 0; 1683 if (FunctionTemplateDecl *OldFunctionTemplate 1684 = dyn_cast<FunctionTemplateDecl>(OldD)) 1685 Old = OldFunctionTemplate->getTemplatedDecl(); 1686 else 1687 Old = dyn_cast<FunctionDecl>(OldD); 1688 if (!Old) { 1689 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1690 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1691 Diag(Shadow->getTargetDecl()->getLocation(), 1692 diag::note_using_decl_target); 1693 Diag(Shadow->getUsingDecl()->getLocation(), 1694 diag::note_using_decl) << 0; 1695 return true; 1696 } 1697 1698 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1699 << New->getDeclName(); 1700 Diag(OldD->getLocation(), diag::note_previous_definition); 1701 return true; 1702 } 1703 1704 // Determine whether the previous declaration was a definition, 1705 // implicit declaration, or a declaration. 1706 diag::kind PrevDiag; 1707 if (Old->isThisDeclarationADefinition()) 1708 PrevDiag = diag::note_previous_definition; 1709 else if (Old->isImplicit()) 1710 PrevDiag = diag::note_previous_implicit_declaration; 1711 else 1712 PrevDiag = diag::note_previous_declaration; 1713 1714 QualType OldQType = Context.getCanonicalType(Old->getType()); 1715 QualType NewQType = Context.getCanonicalType(New->getType()); 1716 1717 // Don't complain about this if we're in GNU89 mode and the old function 1718 // is an extern inline function. 1719 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1720 New->getStorageClass() == SC_Static && 1721 Old->getStorageClass() != SC_Static && 1722 !canRedefineFunction(Old, getLangOptions())) { 1723 if (getLangOptions().MicrosoftExt) { 1724 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1725 Diag(Old->getLocation(), PrevDiag); 1726 } else { 1727 Diag(New->getLocation(), diag::err_static_non_static) << New; 1728 Diag(Old->getLocation(), PrevDiag); 1729 return true; 1730 } 1731 } 1732 1733 // If a function is first declared with a calling convention, but is 1734 // later declared or defined without one, the second decl assumes the 1735 // calling convention of the first. 1736 // 1737 // For the new decl, we have to look at the NON-canonical type to tell the 1738 // difference between a function that really doesn't have a calling 1739 // convention and one that is declared cdecl. That's because in 1740 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1741 // because it is the default calling convention. 1742 // 1743 // Note also that we DO NOT return at this point, because we still have 1744 // other tests to run. 1745 const FunctionType *OldType = cast<FunctionType>(OldQType); 1746 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1747 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1748 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1749 bool RequiresAdjustment = false; 1750 if (OldTypeInfo.getCC() != CC_Default && 1751 NewTypeInfo.getCC() == CC_Default) { 1752 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1753 RequiresAdjustment = true; 1754 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1755 NewTypeInfo.getCC())) { 1756 // Calling conventions really aren't compatible, so complain. 1757 Diag(New->getLocation(), diag::err_cconv_change) 1758 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1759 << (OldTypeInfo.getCC() == CC_Default) 1760 << (OldTypeInfo.getCC() == CC_Default ? "" : 1761 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1762 Diag(Old->getLocation(), diag::note_previous_declaration); 1763 return true; 1764 } 1765 1766 // FIXME: diagnose the other way around? 1767 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1768 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1769 RequiresAdjustment = true; 1770 } 1771 1772 // Merge regparm attribute. 1773 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1774 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1775 if (NewTypeInfo.getHasRegParm()) { 1776 Diag(New->getLocation(), diag::err_regparm_mismatch) 1777 << NewType->getRegParmType() 1778 << OldType->getRegParmType(); 1779 Diag(Old->getLocation(), diag::note_previous_declaration); 1780 return true; 1781 } 1782 1783 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1784 RequiresAdjustment = true; 1785 } 1786 1787 // Merge ns_returns_retained attribute. 1788 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1789 if (NewTypeInfo.getProducesResult()) { 1790 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1791 Diag(Old->getLocation(), diag::note_previous_declaration); 1792 return true; 1793 } 1794 1795 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1796 RequiresAdjustment = true; 1797 } 1798 1799 if (RequiresAdjustment) { 1800 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1801 New->setType(QualType(NewType, 0)); 1802 NewQType = Context.getCanonicalType(New->getType()); 1803 } 1804 1805 if (getLangOptions().CPlusPlus) { 1806 // (C++98 13.1p2): 1807 // Certain function declarations cannot be overloaded: 1808 // -- Function declarations that differ only in the return type 1809 // cannot be overloaded. 1810 QualType OldReturnType = OldType->getResultType(); 1811 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1812 QualType ResQT; 1813 if (OldReturnType != NewReturnType) { 1814 if (NewReturnType->isObjCObjectPointerType() 1815 && OldReturnType->isObjCObjectPointerType()) 1816 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1817 if (ResQT.isNull()) { 1818 if (New->isCXXClassMember() && New->isOutOfLine()) 1819 Diag(New->getLocation(), 1820 diag::err_member_def_does_not_match_ret_type) << New; 1821 else 1822 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1823 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1824 return true; 1825 } 1826 else 1827 NewQType = ResQT; 1828 } 1829 1830 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1831 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1832 if (OldMethod && NewMethod) { 1833 // Preserve triviality. 1834 NewMethod->setTrivial(OldMethod->isTrivial()); 1835 1836 // MSVC allows explicit template specialization at class scope: 1837 // 2 CXMethodDecls referring to the same function will be injected. 1838 // We don't want a redeclartion error. 1839 bool IsClassScopeExplicitSpecialization = 1840 OldMethod->isFunctionTemplateSpecialization() && 1841 NewMethod->isFunctionTemplateSpecialization(); 1842 bool isFriend = NewMethod->getFriendObjectKind(); 1843 1844 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1845 !IsClassScopeExplicitSpecialization) { 1846 // -- Member function declarations with the same name and the 1847 // same parameter types cannot be overloaded if any of them 1848 // is a static member function declaration. 1849 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1850 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1851 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1852 return true; 1853 } 1854 1855 // C++ [class.mem]p1: 1856 // [...] A member shall not be declared twice in the 1857 // member-specification, except that a nested class or member 1858 // class template can be declared and then later defined. 1859 unsigned NewDiag; 1860 if (isa<CXXConstructorDecl>(OldMethod)) 1861 NewDiag = diag::err_constructor_redeclared; 1862 else if (isa<CXXDestructorDecl>(NewMethod)) 1863 NewDiag = diag::err_destructor_redeclared; 1864 else if (isa<CXXConversionDecl>(NewMethod)) 1865 NewDiag = diag::err_conv_function_redeclared; 1866 else 1867 NewDiag = diag::err_member_redeclared; 1868 1869 Diag(New->getLocation(), NewDiag); 1870 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1871 1872 // Complain if this is an explicit declaration of a special 1873 // member that was initially declared implicitly. 1874 // 1875 // As an exception, it's okay to befriend such methods in order 1876 // to permit the implicit constructor/destructor/operator calls. 1877 } else if (OldMethod->isImplicit()) { 1878 if (isFriend) { 1879 NewMethod->setImplicit(); 1880 } else { 1881 Diag(NewMethod->getLocation(), 1882 diag::err_definition_of_implicitly_declared_member) 1883 << New << getSpecialMember(OldMethod); 1884 return true; 1885 } 1886 } else if (OldMethod->isExplicitlyDefaulted()) { 1887 Diag(NewMethod->getLocation(), 1888 diag::err_definition_of_explicitly_defaulted_member) 1889 << getSpecialMember(OldMethod); 1890 return true; 1891 } 1892 } 1893 1894 // (C++98 8.3.5p3): 1895 // All declarations for a function shall agree exactly in both the 1896 // return type and the parameter-type-list. 1897 // We also want to respect all the extended bits except noreturn. 1898 1899 // noreturn should now match unless the old type info didn't have it. 1900 QualType OldQTypeForComparison = OldQType; 1901 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1902 assert(OldQType == QualType(OldType, 0)); 1903 const FunctionType *OldTypeForComparison 1904 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1905 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1906 assert(OldQTypeForComparison.isCanonical()); 1907 } 1908 1909 if (OldQTypeForComparison == NewQType) 1910 return MergeCompatibleFunctionDecls(New, Old); 1911 1912 // Fall through for conflicting redeclarations and redefinitions. 1913 } 1914 1915 // C: Function types need to be compatible, not identical. This handles 1916 // duplicate function decls like "void f(int); void f(enum X);" properly. 1917 if (!getLangOptions().CPlusPlus && 1918 Context.typesAreCompatible(OldQType, NewQType)) { 1919 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1920 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1921 const FunctionProtoType *OldProto = 0; 1922 if (isa<FunctionNoProtoType>(NewFuncType) && 1923 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1924 // The old declaration provided a function prototype, but the 1925 // new declaration does not. Merge in the prototype. 1926 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1927 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1928 OldProto->arg_type_end()); 1929 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1930 ParamTypes.data(), ParamTypes.size(), 1931 OldProto->getExtProtoInfo()); 1932 New->setType(NewQType); 1933 New->setHasInheritedPrototype(); 1934 1935 // Synthesize a parameter for each argument type. 1936 SmallVector<ParmVarDecl*, 16> Params; 1937 for (FunctionProtoType::arg_type_iterator 1938 ParamType = OldProto->arg_type_begin(), 1939 ParamEnd = OldProto->arg_type_end(); 1940 ParamType != ParamEnd; ++ParamType) { 1941 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1942 SourceLocation(), 1943 SourceLocation(), 0, 1944 *ParamType, /*TInfo=*/0, 1945 SC_None, SC_None, 1946 0); 1947 Param->setScopeInfo(0, Params.size()); 1948 Param->setImplicit(); 1949 Params.push_back(Param); 1950 } 1951 1952 New->setParams(Params); 1953 } 1954 1955 return MergeCompatibleFunctionDecls(New, Old); 1956 } 1957 1958 // GNU C permits a K&R definition to follow a prototype declaration 1959 // if the declared types of the parameters in the K&R definition 1960 // match the types in the prototype declaration, even when the 1961 // promoted types of the parameters from the K&R definition differ 1962 // from the types in the prototype. GCC then keeps the types from 1963 // the prototype. 1964 // 1965 // If a variadic prototype is followed by a non-variadic K&R definition, 1966 // the K&R definition becomes variadic. This is sort of an edge case, but 1967 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1968 // C99 6.9.1p8. 1969 if (!getLangOptions().CPlusPlus && 1970 Old->hasPrototype() && !New->hasPrototype() && 1971 New->getType()->getAs<FunctionProtoType>() && 1972 Old->getNumParams() == New->getNumParams()) { 1973 SmallVector<QualType, 16> ArgTypes; 1974 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1975 const FunctionProtoType *OldProto 1976 = Old->getType()->getAs<FunctionProtoType>(); 1977 const FunctionProtoType *NewProto 1978 = New->getType()->getAs<FunctionProtoType>(); 1979 1980 // Determine whether this is the GNU C extension. 1981 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1982 NewProto->getResultType()); 1983 bool LooseCompatible = !MergedReturn.isNull(); 1984 for (unsigned Idx = 0, End = Old->getNumParams(); 1985 LooseCompatible && Idx != End; ++Idx) { 1986 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1987 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1988 if (Context.typesAreCompatible(OldParm->getType(), 1989 NewProto->getArgType(Idx))) { 1990 ArgTypes.push_back(NewParm->getType()); 1991 } else if (Context.typesAreCompatible(OldParm->getType(), 1992 NewParm->getType(), 1993 /*CompareUnqualified=*/true)) { 1994 GNUCompatibleParamWarning Warn 1995 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1996 Warnings.push_back(Warn); 1997 ArgTypes.push_back(NewParm->getType()); 1998 } else 1999 LooseCompatible = false; 2000 } 2001 2002 if (LooseCompatible) { 2003 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2004 Diag(Warnings[Warn].NewParm->getLocation(), 2005 diag::ext_param_promoted_not_compatible_with_prototype) 2006 << Warnings[Warn].PromotedType 2007 << Warnings[Warn].OldParm->getType(); 2008 if (Warnings[Warn].OldParm->getLocation().isValid()) 2009 Diag(Warnings[Warn].OldParm->getLocation(), 2010 diag::note_previous_declaration); 2011 } 2012 2013 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2014 ArgTypes.size(), 2015 OldProto->getExtProtoInfo())); 2016 return MergeCompatibleFunctionDecls(New, Old); 2017 } 2018 2019 // Fall through to diagnose conflicting types. 2020 } 2021 2022 // A function that has already been declared has been redeclared or defined 2023 // with a different type- show appropriate diagnostic 2024 if (unsigned BuiltinID = Old->getBuiltinID()) { 2025 // The user has declared a builtin function with an incompatible 2026 // signature. 2027 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2028 // The function the user is redeclaring is a library-defined 2029 // function like 'malloc' or 'printf'. Warn about the 2030 // redeclaration, then pretend that we don't know about this 2031 // library built-in. 2032 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2033 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2034 << Old << Old->getType(); 2035 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2036 Old->setInvalidDecl(); 2037 return false; 2038 } 2039 2040 PrevDiag = diag::note_previous_builtin_declaration; 2041 } 2042 2043 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2044 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2045 return true; 2046} 2047 2048/// \brief Completes the merge of two function declarations that are 2049/// known to be compatible. 2050/// 2051/// This routine handles the merging of attributes and other 2052/// properties of function declarations form the old declaration to 2053/// the new declaration, once we know that New is in fact a 2054/// redeclaration of Old. 2055/// 2056/// \returns false 2057bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2058 // Merge the attributes 2059 mergeDeclAttributes(New, Old); 2060 2061 // Merge the storage class. 2062 if (Old->getStorageClass() != SC_Extern && 2063 Old->getStorageClass() != SC_None) 2064 New->setStorageClass(Old->getStorageClass()); 2065 2066 // Merge "pure" flag. 2067 if (Old->isPure()) 2068 New->setPure(); 2069 2070 // Merge attributes from the parameters. These can mismatch with K&R 2071 // declarations. 2072 if (New->getNumParams() == Old->getNumParams()) 2073 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2074 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2075 Context); 2076 2077 if (getLangOptions().CPlusPlus) 2078 return MergeCXXFunctionDecl(New, Old); 2079 2080 return false; 2081} 2082 2083 2084void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2085 ObjCMethodDecl *oldMethod) { 2086 // We don't want to merge unavailable and deprecated attributes 2087 // except from interface to implementation. 2088 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2089 2090 // Merge the attributes. 2091 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2092 2093 // Merge attributes from the parameters. 2094 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2095 for (ObjCMethodDecl::param_iterator 2096 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2097 ni != ne; ++ni, ++oi) 2098 mergeParamDeclAttributes(*ni, *oi, Context); 2099 2100 CheckObjCMethodOverride(newMethod, oldMethod, true); 2101} 2102 2103/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2104/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2105/// emitting diagnostics as appropriate. 2106/// 2107/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2108/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2109/// check them before the initializer is attached. 2110/// 2111void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2112 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2113 return; 2114 2115 QualType MergedT; 2116 if (getLangOptions().CPlusPlus) { 2117 AutoType *AT = New->getType()->getContainedAutoType(); 2118 if (AT && !AT->isDeduced()) { 2119 // We don't know what the new type is until the initializer is attached. 2120 return; 2121 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2122 // These could still be something that needs exception specs checked. 2123 return MergeVarDeclExceptionSpecs(New, Old); 2124 } 2125 // C++ [basic.link]p10: 2126 // [...] the types specified by all declarations referring to a given 2127 // object or function shall be identical, except that declarations for an 2128 // array object can specify array types that differ by the presence or 2129 // absence of a major array bound (8.3.4). 2130 else if (Old->getType()->isIncompleteArrayType() && 2131 New->getType()->isArrayType()) { 2132 CanQual<ArrayType> OldArray 2133 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2134 CanQual<ArrayType> NewArray 2135 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2136 if (OldArray->getElementType() == NewArray->getElementType()) 2137 MergedT = New->getType(); 2138 } else if (Old->getType()->isArrayType() && 2139 New->getType()->isIncompleteArrayType()) { 2140 CanQual<ArrayType> OldArray 2141 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2142 CanQual<ArrayType> NewArray 2143 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2144 if (OldArray->getElementType() == NewArray->getElementType()) 2145 MergedT = Old->getType(); 2146 } else if (New->getType()->isObjCObjectPointerType() 2147 && Old->getType()->isObjCObjectPointerType()) { 2148 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2149 Old->getType()); 2150 } 2151 } else { 2152 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2153 } 2154 if (MergedT.isNull()) { 2155 Diag(New->getLocation(), diag::err_redefinition_different_type) 2156 << New->getDeclName(); 2157 Diag(Old->getLocation(), diag::note_previous_definition); 2158 return New->setInvalidDecl(); 2159 } 2160 New->setType(MergedT); 2161} 2162 2163/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2164/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2165/// situation, merging decls or emitting diagnostics as appropriate. 2166/// 2167/// Tentative definition rules (C99 6.9.2p2) are checked by 2168/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2169/// definitions here, since the initializer hasn't been attached. 2170/// 2171void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2172 // If the new decl is already invalid, don't do any other checking. 2173 if (New->isInvalidDecl()) 2174 return; 2175 2176 // Verify the old decl was also a variable. 2177 VarDecl *Old = 0; 2178 if (!Previous.isSingleResult() || 2179 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2180 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2181 << New->getDeclName(); 2182 Diag(Previous.getRepresentativeDecl()->getLocation(), 2183 diag::note_previous_definition); 2184 return New->setInvalidDecl(); 2185 } 2186 2187 // C++ [class.mem]p1: 2188 // A member shall not be declared twice in the member-specification [...] 2189 // 2190 // Here, we need only consider static data members. 2191 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2192 Diag(New->getLocation(), diag::err_duplicate_member) 2193 << New->getIdentifier(); 2194 Diag(Old->getLocation(), diag::note_previous_declaration); 2195 New->setInvalidDecl(); 2196 } 2197 2198 mergeDeclAttributes(New, Old); 2199 // Warn if an already-declared variable is made a weak_import in a subsequent 2200 // declaration 2201 if (New->getAttr<WeakImportAttr>() && 2202 Old->getStorageClass() == SC_None && 2203 !Old->getAttr<WeakImportAttr>()) { 2204 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2205 Diag(Old->getLocation(), diag::note_previous_definition); 2206 // Remove weak_import attribute on new declaration. 2207 New->dropAttr<WeakImportAttr>(); 2208 } 2209 2210 // Merge the types. 2211 MergeVarDeclTypes(New, Old); 2212 if (New->isInvalidDecl()) 2213 return; 2214 2215 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2216 if (New->getStorageClass() == SC_Static && 2217 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2218 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2219 Diag(Old->getLocation(), diag::note_previous_definition); 2220 return New->setInvalidDecl(); 2221 } 2222 // C99 6.2.2p4: 2223 // For an identifier declared with the storage-class specifier 2224 // extern in a scope in which a prior declaration of that 2225 // identifier is visible,23) if the prior declaration specifies 2226 // internal or external linkage, the linkage of the identifier at 2227 // the later declaration is the same as the linkage specified at 2228 // the prior declaration. If no prior declaration is visible, or 2229 // if the prior declaration specifies no linkage, then the 2230 // identifier has external linkage. 2231 if (New->hasExternalStorage() && Old->hasLinkage()) 2232 /* Okay */; 2233 else if (New->getStorageClass() != SC_Static && 2234 Old->getStorageClass() == SC_Static) { 2235 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2236 Diag(Old->getLocation(), diag::note_previous_definition); 2237 return New->setInvalidDecl(); 2238 } 2239 2240 // Check if extern is followed by non-extern and vice-versa. 2241 if (New->hasExternalStorage() && 2242 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2243 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2244 Diag(Old->getLocation(), diag::note_previous_definition); 2245 return New->setInvalidDecl(); 2246 } 2247 if (Old->hasExternalStorage() && 2248 !New->hasLinkage() && New->isLocalVarDecl()) { 2249 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2250 Diag(Old->getLocation(), diag::note_previous_definition); 2251 return New->setInvalidDecl(); 2252 } 2253 2254 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2255 2256 // FIXME: The test for external storage here seems wrong? We still 2257 // need to check for mismatches. 2258 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2259 // Don't complain about out-of-line definitions of static members. 2260 !(Old->getLexicalDeclContext()->isRecord() && 2261 !New->getLexicalDeclContext()->isRecord())) { 2262 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2263 Diag(Old->getLocation(), diag::note_previous_definition); 2264 return New->setInvalidDecl(); 2265 } 2266 2267 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2268 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2269 Diag(Old->getLocation(), diag::note_previous_definition); 2270 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2271 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2272 Diag(Old->getLocation(), diag::note_previous_definition); 2273 } 2274 2275 // C++ doesn't have tentative definitions, so go right ahead and check here. 2276 const VarDecl *Def; 2277 if (getLangOptions().CPlusPlus && 2278 New->isThisDeclarationADefinition() == VarDecl::Definition && 2279 (Def = Old->getDefinition())) { 2280 Diag(New->getLocation(), diag::err_redefinition) 2281 << New->getDeclName(); 2282 Diag(Def->getLocation(), diag::note_previous_definition); 2283 New->setInvalidDecl(); 2284 return; 2285 } 2286 // c99 6.2.2 P4. 2287 // For an identifier declared with the storage-class specifier extern in a 2288 // scope in which a prior declaration of that identifier is visible, if 2289 // the prior declaration specifies internal or external linkage, the linkage 2290 // of the identifier at the later declaration is the same as the linkage 2291 // specified at the prior declaration. 2292 // FIXME. revisit this code. 2293 if (New->hasExternalStorage() && 2294 Old->getLinkage() == InternalLinkage && 2295 New->getDeclContext() == Old->getDeclContext()) 2296 New->setStorageClass(Old->getStorageClass()); 2297 2298 // Keep a chain of previous declarations. 2299 New->setPreviousDeclaration(Old); 2300 2301 // Inherit access appropriately. 2302 New->setAccess(Old->getAccess()); 2303} 2304 2305/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2306/// no declarator (e.g. "struct foo;") is parsed. 2307Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2308 DeclSpec &DS) { 2309 return ParsedFreeStandingDeclSpec(S, AS, DS, 2310 MultiTemplateParamsArg(*this, 0, 0)); 2311} 2312 2313/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2314/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2315/// parameters to cope with template friend declarations. 2316Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2317 DeclSpec &DS, 2318 MultiTemplateParamsArg TemplateParams) { 2319 Decl *TagD = 0; 2320 TagDecl *Tag = 0; 2321 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2322 DS.getTypeSpecType() == DeclSpec::TST_struct || 2323 DS.getTypeSpecType() == DeclSpec::TST_union || 2324 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2325 TagD = DS.getRepAsDecl(); 2326 2327 if (!TagD) // We probably had an error 2328 return 0; 2329 2330 // Note that the above type specs guarantee that the 2331 // type rep is a Decl, whereas in many of the others 2332 // it's a Type. 2333 if (isa<TagDecl>(TagD)) 2334 Tag = cast<TagDecl>(TagD); 2335 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2336 Tag = CTD->getTemplatedDecl(); 2337 } 2338 2339 if (Tag) 2340 Tag->setFreeStanding(); 2341 2342 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2343 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2344 // or incomplete types shall not be restrict-qualified." 2345 if (TypeQuals & DeclSpec::TQ_restrict) 2346 Diag(DS.getRestrictSpecLoc(), 2347 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2348 << DS.getSourceRange(); 2349 } 2350 2351 if (DS.isConstexprSpecified()) { 2352 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2353 // and definitions of functions and variables. 2354 if (Tag) 2355 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2356 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2357 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2358 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2359 else 2360 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2361 // Don't emit warnings after this error. 2362 return TagD; 2363 } 2364 2365 if (DS.isFriendSpecified()) { 2366 // If we're dealing with a decl but not a TagDecl, assume that 2367 // whatever routines created it handled the friendship aspect. 2368 if (TagD && !Tag) 2369 return 0; 2370 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2371 } 2372 2373 // Track whether we warned about the fact that there aren't any 2374 // declarators. 2375 bool emittedWarning = false; 2376 2377 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2378 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2379 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2380 if (getLangOptions().CPlusPlus || 2381 Record->getDeclContext()->isRecord()) 2382 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2383 2384 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2385 << DS.getSourceRange(); 2386 emittedWarning = true; 2387 } 2388 } 2389 2390 // Check for Microsoft C extension: anonymous struct. 2391 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2392 CurContext->isRecord() && 2393 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2394 // Handle 2 kinds of anonymous struct: 2395 // struct STRUCT; 2396 // and 2397 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2398 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2399 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2400 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2401 DS.getRepAsType().get()->isStructureType())) { 2402 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2403 << DS.getSourceRange(); 2404 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2405 } 2406 } 2407 2408 if (getLangOptions().CPlusPlus && 2409 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2410 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2411 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2412 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2413 Diag(Enum->getLocation(), diag::ext_no_declarators) 2414 << DS.getSourceRange(); 2415 emittedWarning = true; 2416 } 2417 2418 // Skip all the checks below if we have a type error. 2419 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2420 2421 if (!DS.isMissingDeclaratorOk()) { 2422 // Warn about typedefs of enums without names, since this is an 2423 // extension in both Microsoft and GNU. 2424 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2425 Tag && isa<EnumDecl>(Tag)) { 2426 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2427 << DS.getSourceRange(); 2428 return Tag; 2429 } 2430 2431 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2432 << DS.getSourceRange(); 2433 emittedWarning = true; 2434 } 2435 2436 // We're going to complain about a bunch of spurious specifiers; 2437 // only do this if we're declaring a tag, because otherwise we 2438 // should be getting diag::ext_no_declarators. 2439 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2440 return TagD; 2441 2442 // Note that a linkage-specification sets a storage class, but 2443 // 'extern "C" struct foo;' is actually valid and not theoretically 2444 // useless. 2445 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2446 if (!DS.isExternInLinkageSpec()) 2447 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2448 << DeclSpec::getSpecifierName(scs); 2449 2450 if (DS.isThreadSpecified()) 2451 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2452 if (DS.getTypeQualifiers()) { 2453 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2454 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2455 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2456 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2457 // Restrict is covered above. 2458 } 2459 if (DS.isInlineSpecified()) 2460 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2461 if (DS.isVirtualSpecified()) 2462 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2463 if (DS.isExplicitSpecified()) 2464 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2465 2466 if (DS.isModulePrivateSpecified() && 2467 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2468 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2469 << Tag->getTagKind() 2470 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2471 2472 // Warn about ignored type attributes, for example: 2473 // __attribute__((aligned)) struct A; 2474 // Attributes should be placed after tag to apply to type declaration. 2475 if (!DS.getAttributes().empty()) { 2476 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2477 if (TypeSpecType == DeclSpec::TST_class || 2478 TypeSpecType == DeclSpec::TST_struct || 2479 TypeSpecType == DeclSpec::TST_union || 2480 TypeSpecType == DeclSpec::TST_enum) { 2481 AttributeList* attrs = DS.getAttributes().getList(); 2482 while (attrs) { 2483 Diag(attrs->getScopeLoc(), 2484 diag::warn_declspec_attribute_ignored) 2485 << attrs->getName() 2486 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2487 TypeSpecType == DeclSpec::TST_struct ? 1 : 2488 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2489 attrs = attrs->getNext(); 2490 } 2491 } 2492 } 2493 2494 return TagD; 2495} 2496 2497/// We are trying to inject an anonymous member into the given scope; 2498/// check if there's an existing declaration that can't be overloaded. 2499/// 2500/// \return true if this is a forbidden redeclaration 2501static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2502 Scope *S, 2503 DeclContext *Owner, 2504 DeclarationName Name, 2505 SourceLocation NameLoc, 2506 unsigned diagnostic) { 2507 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2508 Sema::ForRedeclaration); 2509 if (!SemaRef.LookupName(R, S)) return false; 2510 2511 if (R.getAsSingle<TagDecl>()) 2512 return false; 2513 2514 // Pick a representative declaration. 2515 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2516 assert(PrevDecl && "Expected a non-null Decl"); 2517 2518 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2519 return false; 2520 2521 SemaRef.Diag(NameLoc, diagnostic) << Name; 2522 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2523 2524 return true; 2525} 2526 2527/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2528/// anonymous struct or union AnonRecord into the owning context Owner 2529/// and scope S. This routine will be invoked just after we realize 2530/// that an unnamed union or struct is actually an anonymous union or 2531/// struct, e.g., 2532/// 2533/// @code 2534/// union { 2535/// int i; 2536/// float f; 2537/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2538/// // f into the surrounding scope.x 2539/// @endcode 2540/// 2541/// This routine is recursive, injecting the names of nested anonymous 2542/// structs/unions into the owning context and scope as well. 2543static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2544 DeclContext *Owner, 2545 RecordDecl *AnonRecord, 2546 AccessSpecifier AS, 2547 SmallVector<NamedDecl*, 2> &Chaining, 2548 bool MSAnonStruct) { 2549 unsigned diagKind 2550 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2551 : diag::err_anonymous_struct_member_redecl; 2552 2553 bool Invalid = false; 2554 2555 // Look every FieldDecl and IndirectFieldDecl with a name. 2556 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2557 DEnd = AnonRecord->decls_end(); 2558 D != DEnd; ++D) { 2559 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2560 cast<NamedDecl>(*D)->getDeclName()) { 2561 ValueDecl *VD = cast<ValueDecl>(*D); 2562 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2563 VD->getLocation(), diagKind)) { 2564 // C++ [class.union]p2: 2565 // The names of the members of an anonymous union shall be 2566 // distinct from the names of any other entity in the 2567 // scope in which the anonymous union is declared. 2568 Invalid = true; 2569 } else { 2570 // C++ [class.union]p2: 2571 // For the purpose of name lookup, after the anonymous union 2572 // definition, the members of the anonymous union are 2573 // considered to have been defined in the scope in which the 2574 // anonymous union is declared. 2575 unsigned OldChainingSize = Chaining.size(); 2576 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2577 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2578 PE = IF->chain_end(); PI != PE; ++PI) 2579 Chaining.push_back(*PI); 2580 else 2581 Chaining.push_back(VD); 2582 2583 assert(Chaining.size() >= 2); 2584 NamedDecl **NamedChain = 2585 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2586 for (unsigned i = 0; i < Chaining.size(); i++) 2587 NamedChain[i] = Chaining[i]; 2588 2589 IndirectFieldDecl* IndirectField = 2590 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2591 VD->getIdentifier(), VD->getType(), 2592 NamedChain, Chaining.size()); 2593 2594 IndirectField->setAccess(AS); 2595 IndirectField->setImplicit(); 2596 SemaRef.PushOnScopeChains(IndirectField, S); 2597 2598 // That includes picking up the appropriate access specifier. 2599 if (AS != AS_none) IndirectField->setAccess(AS); 2600 2601 Chaining.resize(OldChainingSize); 2602 } 2603 } 2604 } 2605 2606 return Invalid; 2607} 2608 2609/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2610/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2611/// illegal input values are mapped to SC_None. 2612static StorageClass 2613StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2614 switch (StorageClassSpec) { 2615 case DeclSpec::SCS_unspecified: return SC_None; 2616 case DeclSpec::SCS_extern: return SC_Extern; 2617 case DeclSpec::SCS_static: return SC_Static; 2618 case DeclSpec::SCS_auto: return SC_Auto; 2619 case DeclSpec::SCS_register: return SC_Register; 2620 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2621 // Illegal SCSs map to None: error reporting is up to the caller. 2622 case DeclSpec::SCS_mutable: // Fall through. 2623 case DeclSpec::SCS_typedef: return SC_None; 2624 } 2625 llvm_unreachable("unknown storage class specifier"); 2626} 2627 2628/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2629/// a StorageClass. Any error reporting is up to the caller: 2630/// illegal input values are mapped to SC_None. 2631static StorageClass 2632StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2633 switch (StorageClassSpec) { 2634 case DeclSpec::SCS_unspecified: return SC_None; 2635 case DeclSpec::SCS_extern: return SC_Extern; 2636 case DeclSpec::SCS_static: return SC_Static; 2637 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2638 // Illegal SCSs map to None: error reporting is up to the caller. 2639 case DeclSpec::SCS_auto: // Fall through. 2640 case DeclSpec::SCS_mutable: // Fall through. 2641 case DeclSpec::SCS_register: // Fall through. 2642 case DeclSpec::SCS_typedef: return SC_None; 2643 } 2644 llvm_unreachable("unknown storage class specifier"); 2645} 2646 2647/// BuildAnonymousStructOrUnion - Handle the declaration of an 2648/// anonymous structure or union. Anonymous unions are a C++ feature 2649/// (C++ [class.union]) and a GNU C extension; anonymous structures 2650/// are a GNU C and GNU C++ extension. 2651Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2652 AccessSpecifier AS, 2653 RecordDecl *Record) { 2654 DeclContext *Owner = Record->getDeclContext(); 2655 2656 // Diagnose whether this anonymous struct/union is an extension. 2657 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2658 Diag(Record->getLocation(), diag::ext_anonymous_union); 2659 else if (!Record->isUnion()) 2660 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2661 2662 // C and C++ require different kinds of checks for anonymous 2663 // structs/unions. 2664 bool Invalid = false; 2665 if (getLangOptions().CPlusPlus) { 2666 const char* PrevSpec = 0; 2667 unsigned DiagID; 2668 if (Record->isUnion()) { 2669 // C++ [class.union]p6: 2670 // Anonymous unions declared in a named namespace or in the 2671 // global namespace shall be declared static. 2672 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2673 (isa<TranslationUnitDecl>(Owner) || 2674 (isa<NamespaceDecl>(Owner) && 2675 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2676 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2677 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2678 2679 // Recover by adding 'static'. 2680 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2681 PrevSpec, DiagID); 2682 } 2683 // C++ [class.union]p6: 2684 // A storage class is not allowed in a declaration of an 2685 // anonymous union in a class scope. 2686 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2687 isa<RecordDecl>(Owner)) { 2688 Diag(DS.getStorageClassSpecLoc(), 2689 diag::err_anonymous_union_with_storage_spec) 2690 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2691 2692 // Recover by removing the storage specifier. 2693 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2694 SourceLocation(), 2695 PrevSpec, DiagID); 2696 } 2697 } 2698 2699 // Ignore const/volatile/restrict qualifiers. 2700 if (DS.getTypeQualifiers()) { 2701 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2702 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2703 << Record->isUnion() << 0 2704 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2705 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2706 Diag(DS.getVolatileSpecLoc(), 2707 diag::ext_anonymous_struct_union_qualified) 2708 << Record->isUnion() << 1 2709 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2710 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2711 Diag(DS.getRestrictSpecLoc(), 2712 diag::ext_anonymous_struct_union_qualified) 2713 << Record->isUnion() << 2 2714 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2715 2716 DS.ClearTypeQualifiers(); 2717 } 2718 2719 // C++ [class.union]p2: 2720 // The member-specification of an anonymous union shall only 2721 // define non-static data members. [Note: nested types and 2722 // functions cannot be declared within an anonymous union. ] 2723 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2724 MemEnd = Record->decls_end(); 2725 Mem != MemEnd; ++Mem) { 2726 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2727 // C++ [class.union]p3: 2728 // An anonymous union shall not have private or protected 2729 // members (clause 11). 2730 assert(FD->getAccess() != AS_none); 2731 if (FD->getAccess() != AS_public) { 2732 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2733 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2734 Invalid = true; 2735 } 2736 2737 // C++ [class.union]p1 2738 // An object of a class with a non-trivial constructor, a non-trivial 2739 // copy constructor, a non-trivial destructor, or a non-trivial copy 2740 // assignment operator cannot be a member of a union, nor can an 2741 // array of such objects. 2742 if (CheckNontrivialField(FD)) 2743 Invalid = true; 2744 } else if ((*Mem)->isImplicit()) { 2745 // Any implicit members are fine. 2746 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2747 // This is a type that showed up in an 2748 // elaborated-type-specifier inside the anonymous struct or 2749 // union, but which actually declares a type outside of the 2750 // anonymous struct or union. It's okay. 2751 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2752 if (!MemRecord->isAnonymousStructOrUnion() && 2753 MemRecord->getDeclName()) { 2754 // Visual C++ allows type definition in anonymous struct or union. 2755 if (getLangOptions().MicrosoftExt) 2756 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2757 << (int)Record->isUnion(); 2758 else { 2759 // This is a nested type declaration. 2760 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2761 << (int)Record->isUnion(); 2762 Invalid = true; 2763 } 2764 } 2765 } else if (isa<AccessSpecDecl>(*Mem)) { 2766 // Any access specifier is fine. 2767 } else { 2768 // We have something that isn't a non-static data 2769 // member. Complain about it. 2770 unsigned DK = diag::err_anonymous_record_bad_member; 2771 if (isa<TypeDecl>(*Mem)) 2772 DK = diag::err_anonymous_record_with_type; 2773 else if (isa<FunctionDecl>(*Mem)) 2774 DK = diag::err_anonymous_record_with_function; 2775 else if (isa<VarDecl>(*Mem)) 2776 DK = diag::err_anonymous_record_with_static; 2777 2778 // Visual C++ allows type definition in anonymous struct or union. 2779 if (getLangOptions().MicrosoftExt && 2780 DK == diag::err_anonymous_record_with_type) 2781 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2782 << (int)Record->isUnion(); 2783 else { 2784 Diag((*Mem)->getLocation(), DK) 2785 << (int)Record->isUnion(); 2786 Invalid = true; 2787 } 2788 } 2789 } 2790 } 2791 2792 if (!Record->isUnion() && !Owner->isRecord()) { 2793 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2794 << (int)getLangOptions().CPlusPlus; 2795 Invalid = true; 2796 } 2797 2798 // Mock up a declarator. 2799 Declarator Dc(DS, Declarator::MemberContext); 2800 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2801 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2802 2803 // Create a declaration for this anonymous struct/union. 2804 NamedDecl *Anon = 0; 2805 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2806 Anon = FieldDecl::Create(Context, OwningClass, 2807 DS.getSourceRange().getBegin(), 2808 Record->getLocation(), 2809 /*IdentifierInfo=*/0, 2810 Context.getTypeDeclType(Record), 2811 TInfo, 2812 /*BitWidth=*/0, /*Mutable=*/false, 2813 /*HasInit=*/false); 2814 Anon->setAccess(AS); 2815 if (getLangOptions().CPlusPlus) 2816 FieldCollector->Add(cast<FieldDecl>(Anon)); 2817 } else { 2818 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2819 assert(SCSpec != DeclSpec::SCS_typedef && 2820 "Parser allowed 'typedef' as storage class VarDecl."); 2821 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2822 if (SCSpec == DeclSpec::SCS_mutable) { 2823 // mutable can only appear on non-static class members, so it's always 2824 // an error here 2825 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2826 Invalid = true; 2827 SC = SC_None; 2828 } 2829 SCSpec = DS.getStorageClassSpecAsWritten(); 2830 VarDecl::StorageClass SCAsWritten 2831 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2832 2833 Anon = VarDecl::Create(Context, Owner, 2834 DS.getSourceRange().getBegin(), 2835 Record->getLocation(), /*IdentifierInfo=*/0, 2836 Context.getTypeDeclType(Record), 2837 TInfo, SC, SCAsWritten); 2838 2839 // Default-initialize the implicit variable. This initialization will be 2840 // trivial in almost all cases, except if a union member has an in-class 2841 // initializer: 2842 // union { int n = 0; }; 2843 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2844 } 2845 Anon->setImplicit(); 2846 2847 // Add the anonymous struct/union object to the current 2848 // context. We'll be referencing this object when we refer to one of 2849 // its members. 2850 Owner->addDecl(Anon); 2851 2852 // Inject the members of the anonymous struct/union into the owning 2853 // context and into the identifier resolver chain for name lookup 2854 // purposes. 2855 SmallVector<NamedDecl*, 2> Chain; 2856 Chain.push_back(Anon); 2857 2858 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2859 Chain, false)) 2860 Invalid = true; 2861 2862 // Mark this as an anonymous struct/union type. Note that we do not 2863 // do this until after we have already checked and injected the 2864 // members of this anonymous struct/union type, because otherwise 2865 // the members could be injected twice: once by DeclContext when it 2866 // builds its lookup table, and once by 2867 // InjectAnonymousStructOrUnionMembers. 2868 Record->setAnonymousStructOrUnion(true); 2869 2870 if (Invalid) 2871 Anon->setInvalidDecl(); 2872 2873 return Anon; 2874} 2875 2876/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2877/// Microsoft C anonymous structure. 2878/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2879/// Example: 2880/// 2881/// struct A { int a; }; 2882/// struct B { struct A; int b; }; 2883/// 2884/// void foo() { 2885/// B var; 2886/// var.a = 3; 2887/// } 2888/// 2889Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2890 RecordDecl *Record) { 2891 2892 // If there is no Record, get the record via the typedef. 2893 if (!Record) 2894 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2895 2896 // Mock up a declarator. 2897 Declarator Dc(DS, Declarator::TypeNameContext); 2898 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2899 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2900 2901 // Create a declaration for this anonymous struct. 2902 NamedDecl* Anon = FieldDecl::Create(Context, 2903 cast<RecordDecl>(CurContext), 2904 DS.getSourceRange().getBegin(), 2905 DS.getSourceRange().getBegin(), 2906 /*IdentifierInfo=*/0, 2907 Context.getTypeDeclType(Record), 2908 TInfo, 2909 /*BitWidth=*/0, /*Mutable=*/false, 2910 /*HasInit=*/false); 2911 Anon->setImplicit(); 2912 2913 // Add the anonymous struct object to the current context. 2914 CurContext->addDecl(Anon); 2915 2916 // Inject the members of the anonymous struct into the current 2917 // context and into the identifier resolver chain for name lookup 2918 // purposes. 2919 SmallVector<NamedDecl*, 2> Chain; 2920 Chain.push_back(Anon); 2921 2922 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2923 Record->getDefinition(), 2924 AS_none, Chain, true)) 2925 Anon->setInvalidDecl(); 2926 2927 return Anon; 2928} 2929 2930/// GetNameForDeclarator - Determine the full declaration name for the 2931/// given Declarator. 2932DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2933 return GetNameFromUnqualifiedId(D.getName()); 2934} 2935 2936/// \brief Retrieves the declaration name from a parsed unqualified-id. 2937DeclarationNameInfo 2938Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2939 DeclarationNameInfo NameInfo; 2940 NameInfo.setLoc(Name.StartLocation); 2941 2942 switch (Name.getKind()) { 2943 2944 case UnqualifiedId::IK_ImplicitSelfParam: 2945 case UnqualifiedId::IK_Identifier: 2946 NameInfo.setName(Name.Identifier); 2947 NameInfo.setLoc(Name.StartLocation); 2948 return NameInfo; 2949 2950 case UnqualifiedId::IK_OperatorFunctionId: 2951 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2952 Name.OperatorFunctionId.Operator)); 2953 NameInfo.setLoc(Name.StartLocation); 2954 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2955 = Name.OperatorFunctionId.SymbolLocations[0]; 2956 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2957 = Name.EndLocation.getRawEncoding(); 2958 return NameInfo; 2959 2960 case UnqualifiedId::IK_LiteralOperatorId: 2961 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2962 Name.Identifier)); 2963 NameInfo.setLoc(Name.StartLocation); 2964 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2965 return NameInfo; 2966 2967 case UnqualifiedId::IK_ConversionFunctionId: { 2968 TypeSourceInfo *TInfo; 2969 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2970 if (Ty.isNull()) 2971 return DeclarationNameInfo(); 2972 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2973 Context.getCanonicalType(Ty))); 2974 NameInfo.setLoc(Name.StartLocation); 2975 NameInfo.setNamedTypeInfo(TInfo); 2976 return NameInfo; 2977 } 2978 2979 case UnqualifiedId::IK_ConstructorName: { 2980 TypeSourceInfo *TInfo; 2981 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2982 if (Ty.isNull()) 2983 return DeclarationNameInfo(); 2984 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2985 Context.getCanonicalType(Ty))); 2986 NameInfo.setLoc(Name.StartLocation); 2987 NameInfo.setNamedTypeInfo(TInfo); 2988 return NameInfo; 2989 } 2990 2991 case UnqualifiedId::IK_ConstructorTemplateId: { 2992 // In well-formed code, we can only have a constructor 2993 // template-id that refers to the current context, so go there 2994 // to find the actual type being constructed. 2995 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2996 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2997 return DeclarationNameInfo(); 2998 2999 // Determine the type of the class being constructed. 3000 QualType CurClassType = Context.getTypeDeclType(CurClass); 3001 3002 // FIXME: Check two things: that the template-id names the same type as 3003 // CurClassType, and that the template-id does not occur when the name 3004 // was qualified. 3005 3006 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3007 Context.getCanonicalType(CurClassType))); 3008 NameInfo.setLoc(Name.StartLocation); 3009 // FIXME: should we retrieve TypeSourceInfo? 3010 NameInfo.setNamedTypeInfo(0); 3011 return NameInfo; 3012 } 3013 3014 case UnqualifiedId::IK_DestructorName: { 3015 TypeSourceInfo *TInfo; 3016 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3017 if (Ty.isNull()) 3018 return DeclarationNameInfo(); 3019 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3020 Context.getCanonicalType(Ty))); 3021 NameInfo.setLoc(Name.StartLocation); 3022 NameInfo.setNamedTypeInfo(TInfo); 3023 return NameInfo; 3024 } 3025 3026 case UnqualifiedId::IK_TemplateId: { 3027 TemplateName TName = Name.TemplateId->Template.get(); 3028 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3029 return Context.getNameForTemplate(TName, TNameLoc); 3030 } 3031 3032 } // switch (Name.getKind()) 3033 3034 llvm_unreachable("Unknown name kind"); 3035} 3036 3037static QualType getCoreType(QualType Ty) { 3038 do { 3039 if (Ty->isPointerType() || Ty->isReferenceType()) 3040 Ty = Ty->getPointeeType(); 3041 else if (Ty->isArrayType()) 3042 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3043 else 3044 return Ty.withoutLocalFastQualifiers(); 3045 } while (true); 3046} 3047 3048/// hasSimilarParameters - Determine whether the C++ functions Declaration 3049/// and Definition have "nearly" matching parameters. This heuristic is 3050/// used to improve diagnostics in the case where an out-of-line function 3051/// definition doesn't match any declaration within the class or namespace. 3052/// Also sets Params to the list of indices to the parameters that differ 3053/// between the declaration and the definition. If hasSimilarParameters 3054/// returns true and Params is empty, then all of the parameters match. 3055static bool hasSimilarParameters(ASTContext &Context, 3056 FunctionDecl *Declaration, 3057 FunctionDecl *Definition, 3058 llvm::SmallVectorImpl<unsigned> &Params) { 3059 Params.clear(); 3060 if (Declaration->param_size() != Definition->param_size()) 3061 return false; 3062 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3063 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3064 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3065 3066 // The parameter types are identical 3067 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3068 continue; 3069 3070 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3071 QualType DefParamBaseTy = getCoreType(DefParamTy); 3072 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3073 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3074 3075 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3076 (DeclTyName && DeclTyName == DefTyName)) 3077 Params.push_back(Idx); 3078 else // The two parameters aren't even close 3079 return false; 3080 } 3081 3082 return true; 3083} 3084 3085/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3086/// declarator needs to be rebuilt in the current instantiation. 3087/// Any bits of declarator which appear before the name are valid for 3088/// consideration here. That's specifically the type in the decl spec 3089/// and the base type in any member-pointer chunks. 3090static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3091 DeclarationName Name) { 3092 // The types we specifically need to rebuild are: 3093 // - typenames, typeofs, and decltypes 3094 // - types which will become injected class names 3095 // Of course, we also need to rebuild any type referencing such a 3096 // type. It's safest to just say "dependent", but we call out a 3097 // few cases here. 3098 3099 DeclSpec &DS = D.getMutableDeclSpec(); 3100 switch (DS.getTypeSpecType()) { 3101 case DeclSpec::TST_typename: 3102 case DeclSpec::TST_typeofType: 3103 case DeclSpec::TST_decltype: 3104 case DeclSpec::TST_underlyingType: 3105 case DeclSpec::TST_atomic: { 3106 // Grab the type from the parser. 3107 TypeSourceInfo *TSI = 0; 3108 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3109 if (T.isNull() || !T->isDependentType()) break; 3110 3111 // Make sure there's a type source info. This isn't really much 3112 // of a waste; most dependent types should have type source info 3113 // attached already. 3114 if (!TSI) 3115 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3116 3117 // Rebuild the type in the current instantiation. 3118 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3119 if (!TSI) return true; 3120 3121 // Store the new type back in the decl spec. 3122 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3123 DS.UpdateTypeRep(LocType); 3124 break; 3125 } 3126 3127 case DeclSpec::TST_typeofExpr: { 3128 Expr *E = DS.getRepAsExpr(); 3129 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3130 if (Result.isInvalid()) return true; 3131 DS.UpdateExprRep(Result.get()); 3132 break; 3133 } 3134 3135 default: 3136 // Nothing to do for these decl specs. 3137 break; 3138 } 3139 3140 // It doesn't matter what order we do this in. 3141 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3142 DeclaratorChunk &Chunk = D.getTypeObject(I); 3143 3144 // The only type information in the declarator which can come 3145 // before the declaration name is the base type of a member 3146 // pointer. 3147 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3148 continue; 3149 3150 // Rebuild the scope specifier in-place. 3151 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3152 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3153 return true; 3154 } 3155 3156 return false; 3157} 3158 3159Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3160 D.setFunctionDefinitionKind(FDK_Declaration); 3161 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3162 3163 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3164 Dcl->getDeclContext()->isFileContext()) 3165 Dcl->setTopLevelDeclInObjCContainer(); 3166 3167 return Dcl; 3168} 3169 3170/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3171/// If T is the name of a class, then each of the following shall have a 3172/// name different from T: 3173/// - every static data member of class T; 3174/// - every member function of class T 3175/// - every member of class T that is itself a type; 3176/// \returns true if the declaration name violates these rules. 3177bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3178 DeclarationNameInfo NameInfo) { 3179 DeclarationName Name = NameInfo.getName(); 3180 3181 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3182 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3183 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3184 return true; 3185 } 3186 3187 return false; 3188} 3189 3190Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3191 MultiTemplateParamsArg TemplateParamLists) { 3192 // TODO: consider using NameInfo for diagnostic. 3193 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3194 DeclarationName Name = NameInfo.getName(); 3195 3196 // All of these full declarators require an identifier. If it doesn't have 3197 // one, the ParsedFreeStandingDeclSpec action should be used. 3198 if (!Name) { 3199 if (!D.isInvalidType()) // Reject this if we think it is valid. 3200 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3201 diag::err_declarator_need_ident) 3202 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3203 return 0; 3204 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3205 return 0; 3206 3207 // The scope passed in may not be a decl scope. Zip up the scope tree until 3208 // we find one that is. 3209 while ((S->getFlags() & Scope::DeclScope) == 0 || 3210 (S->getFlags() & Scope::TemplateParamScope) != 0) 3211 S = S->getParent(); 3212 3213 DeclContext *DC = CurContext; 3214 if (D.getCXXScopeSpec().isInvalid()) 3215 D.setInvalidType(); 3216 else if (D.getCXXScopeSpec().isSet()) { 3217 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3218 UPPC_DeclarationQualifier)) 3219 return 0; 3220 3221 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3222 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3223 if (!DC) { 3224 // If we could not compute the declaration context, it's because the 3225 // declaration context is dependent but does not refer to a class, 3226 // class template, or class template partial specialization. Complain 3227 // and return early, to avoid the coming semantic disaster. 3228 Diag(D.getIdentifierLoc(), 3229 diag::err_template_qualified_declarator_no_match) 3230 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3231 << D.getCXXScopeSpec().getRange(); 3232 return 0; 3233 } 3234 bool IsDependentContext = DC->isDependentContext(); 3235 3236 if (!IsDependentContext && 3237 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3238 return 0; 3239 3240 if (isa<CXXRecordDecl>(DC)) { 3241 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3242 Diag(D.getIdentifierLoc(), 3243 diag::err_member_def_undefined_record) 3244 << Name << DC << D.getCXXScopeSpec().getRange(); 3245 D.setInvalidType(); 3246 } else if (isa<CXXRecordDecl>(CurContext) && 3247 !D.getDeclSpec().isFriendSpecified()) { 3248 // The user provided a superfluous scope specifier inside a class 3249 // definition: 3250 // 3251 // class X { 3252 // void X::f(); 3253 // }; 3254 if (CurContext->Equals(DC)) { 3255 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3256 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3257 } else { 3258 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3259 << Name << D.getCXXScopeSpec().getRange(); 3260 3261 // C++ constructors and destructors with incorrect scopes can break 3262 // our AST invariants by having the wrong underlying types. If 3263 // that's the case, then drop this declaration entirely. 3264 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3265 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3266 !Context.hasSameType(Name.getCXXNameType(), 3267 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3268 return 0; 3269 } 3270 3271 // Pretend that this qualifier was not here. 3272 D.getCXXScopeSpec().clear(); 3273 } 3274 } 3275 3276 // Check whether we need to rebuild the type of the given 3277 // declaration in the current instantiation. 3278 if (EnteringContext && IsDependentContext && 3279 TemplateParamLists.size() != 0) { 3280 ContextRAII SavedContext(*this, DC); 3281 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3282 D.setInvalidType(); 3283 } 3284 } 3285 3286 if (DiagnoseClassNameShadow(DC, NameInfo)) 3287 // If this is a typedef, we'll end up spewing multiple diagnostics. 3288 // Just return early; it's safer. 3289 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3290 return 0; 3291 3292 NamedDecl *New; 3293 3294 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3295 QualType R = TInfo->getType(); 3296 3297 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3298 UPPC_DeclarationType)) 3299 D.setInvalidType(); 3300 3301 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3302 ForRedeclaration); 3303 3304 // See if this is a redefinition of a variable in the same scope. 3305 if (!D.getCXXScopeSpec().isSet()) { 3306 bool IsLinkageLookup = false; 3307 3308 // If the declaration we're planning to build will be a function 3309 // or object with linkage, then look for another declaration with 3310 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3311 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3312 /* Do nothing*/; 3313 else if (R->isFunctionType()) { 3314 if (CurContext->isFunctionOrMethod() || 3315 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3316 IsLinkageLookup = true; 3317 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3318 IsLinkageLookup = true; 3319 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3320 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3321 IsLinkageLookup = true; 3322 3323 if (IsLinkageLookup) 3324 Previous.clear(LookupRedeclarationWithLinkage); 3325 3326 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3327 } else { // Something like "int foo::x;" 3328 LookupQualifiedName(Previous, DC); 3329 3330 // Don't consider using declarations as previous declarations for 3331 // out-of-line members. 3332 RemoveUsingDecls(Previous); 3333 3334 // C++ 7.3.1.2p2: 3335 // Members (including explicit specializations of templates) of a named 3336 // namespace can also be defined outside that namespace by explicit 3337 // qualification of the name being defined, provided that the entity being 3338 // defined was already declared in the namespace and the definition appears 3339 // after the point of declaration in a namespace that encloses the 3340 // declarations namespace. 3341 // 3342 // Note that we only check the context at this point. We don't yet 3343 // have enough information to make sure that PrevDecl is actually 3344 // the declaration we want to match. For example, given: 3345 // 3346 // class X { 3347 // void f(); 3348 // void f(float); 3349 // }; 3350 // 3351 // void X::f(int) { } // ill-formed 3352 // 3353 // In this case, PrevDecl will point to the overload set 3354 // containing the two f's declared in X, but neither of them 3355 // matches. 3356 3357 // First check whether we named the global scope. 3358 if (isa<TranslationUnitDecl>(DC)) { 3359 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3360 << Name << D.getCXXScopeSpec().getRange(); 3361 } else { 3362 DeclContext *Cur = CurContext; 3363 while (isa<LinkageSpecDecl>(Cur)) 3364 Cur = Cur->getParent(); 3365 if (!Cur->Encloses(DC)) { 3366 // The qualifying scope doesn't enclose the original declaration. 3367 // Emit diagnostic based on current scope. 3368 SourceLocation L = D.getIdentifierLoc(); 3369 SourceRange R = D.getCXXScopeSpec().getRange(); 3370 if (isa<FunctionDecl>(Cur)) 3371 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3372 else 3373 Diag(L, diag::err_invalid_declarator_scope) 3374 << Name << cast<NamedDecl>(DC) << R; 3375 D.setInvalidType(); 3376 } 3377 3378 // C++11 8.3p1: 3379 // ... "The nested-name-specifier of the qualified declarator-id shall 3380 // not begin with a decltype-specifer" 3381 NestedNameSpecifierLoc SpecLoc = 3382 D.getCXXScopeSpec().getWithLocInContext(Context); 3383 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3384 "NestedNameSpecifierLoc"); 3385 while (SpecLoc.getPrefix()) 3386 SpecLoc = SpecLoc.getPrefix(); 3387 if (dyn_cast_or_null<DecltypeType>( 3388 SpecLoc.getNestedNameSpecifier()->getAsType())) 3389 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3390 << SpecLoc.getTypeLoc().getSourceRange(); 3391 } 3392 } 3393 3394 if (Previous.isSingleResult() && 3395 Previous.getFoundDecl()->isTemplateParameter()) { 3396 // Maybe we will complain about the shadowed template parameter. 3397 if (!D.isInvalidType()) 3398 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3399 Previous.getFoundDecl()); 3400 3401 // Just pretend that we didn't see the previous declaration. 3402 Previous.clear(); 3403 } 3404 3405 // In C++, the previous declaration we find might be a tag type 3406 // (class or enum). In this case, the new declaration will hide the 3407 // tag type. Note that this does does not apply if we're declaring a 3408 // typedef (C++ [dcl.typedef]p4). 3409 if (Previous.isSingleTagDecl() && 3410 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3411 Previous.clear(); 3412 3413 bool AddToScope = true; 3414 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3415 if (TemplateParamLists.size()) { 3416 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3417 return 0; 3418 } 3419 3420 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3421 } else if (R->isFunctionType()) { 3422 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3423 move(TemplateParamLists), 3424 AddToScope); 3425 } else { 3426 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3427 move(TemplateParamLists)); 3428 } 3429 3430 if (New == 0) 3431 return 0; 3432 3433 // If this has an identifier and is not an invalid redeclaration or 3434 // function template specialization, add it to the scope stack. 3435 if (New->getDeclName() && AddToScope && 3436 !(D.isRedeclaration() && New->isInvalidDecl())) 3437 PushOnScopeChains(New, S); 3438 3439 return New; 3440} 3441 3442/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3443/// types into constant array types in certain situations which would otherwise 3444/// be errors (for GCC compatibility). 3445static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3446 ASTContext &Context, 3447 bool &SizeIsNegative, 3448 llvm::APSInt &Oversized) { 3449 // This method tries to turn a variable array into a constant 3450 // array even when the size isn't an ICE. This is necessary 3451 // for compatibility with code that depends on gcc's buggy 3452 // constant expression folding, like struct {char x[(int)(char*)2];} 3453 SizeIsNegative = false; 3454 Oversized = 0; 3455 3456 if (T->isDependentType()) 3457 return QualType(); 3458 3459 QualifierCollector Qs; 3460 const Type *Ty = Qs.strip(T); 3461 3462 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3463 QualType Pointee = PTy->getPointeeType(); 3464 QualType FixedType = 3465 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3466 Oversized); 3467 if (FixedType.isNull()) return FixedType; 3468 FixedType = Context.getPointerType(FixedType); 3469 return Qs.apply(Context, FixedType); 3470 } 3471 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3472 QualType Inner = PTy->getInnerType(); 3473 QualType FixedType = 3474 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3475 Oversized); 3476 if (FixedType.isNull()) return FixedType; 3477 FixedType = Context.getParenType(FixedType); 3478 return Qs.apply(Context, FixedType); 3479 } 3480 3481 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3482 if (!VLATy) 3483 return QualType(); 3484 // FIXME: We should probably handle this case 3485 if (VLATy->getElementType()->isVariablyModifiedType()) 3486 return QualType(); 3487 3488 llvm::APSInt Res; 3489 if (!VLATy->getSizeExpr() || 3490 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3491 return QualType(); 3492 3493 // Check whether the array size is negative. 3494 if (Res.isSigned() && Res.isNegative()) { 3495 SizeIsNegative = true; 3496 return QualType(); 3497 } 3498 3499 // Check whether the array is too large to be addressed. 3500 unsigned ActiveSizeBits 3501 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3502 Res); 3503 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3504 Oversized = Res; 3505 return QualType(); 3506 } 3507 3508 return Context.getConstantArrayType(VLATy->getElementType(), 3509 Res, ArrayType::Normal, 0); 3510} 3511 3512/// \brief Register the given locally-scoped external C declaration so 3513/// that it can be found later for redeclarations 3514void 3515Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3516 const LookupResult &Previous, 3517 Scope *S) { 3518 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3519 "Decl is not a locally-scoped decl!"); 3520 // Note that we have a locally-scoped external with this name. 3521 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3522 3523 if (!Previous.isSingleResult()) 3524 return; 3525 3526 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3527 3528 // If there was a previous declaration of this variable, it may be 3529 // in our identifier chain. Update the identifier chain with the new 3530 // declaration. 3531 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3532 // The previous declaration was found on the identifer resolver 3533 // chain, so remove it from its scope. 3534 3535 if (S->isDeclScope(PrevDecl)) { 3536 // Special case for redeclarations in the SAME scope. 3537 // Because this declaration is going to be added to the identifier chain 3538 // later, we should temporarily take it OFF the chain. 3539 IdResolver.RemoveDecl(ND); 3540 3541 } else { 3542 // Find the scope for the original declaration. 3543 while (S && !S->isDeclScope(PrevDecl)) 3544 S = S->getParent(); 3545 } 3546 3547 if (S) 3548 S->RemoveDecl(PrevDecl); 3549 } 3550} 3551 3552llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3553Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3554 if (ExternalSource) { 3555 // Load locally-scoped external decls from the external source. 3556 SmallVector<NamedDecl *, 4> Decls; 3557 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3558 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3559 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3560 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3561 if (Pos == LocallyScopedExternalDecls.end()) 3562 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3563 } 3564 } 3565 3566 return LocallyScopedExternalDecls.find(Name); 3567} 3568 3569/// \brief Diagnose function specifiers on a declaration of an identifier that 3570/// does not identify a function. 3571void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3572 // FIXME: We should probably indicate the identifier in question to avoid 3573 // confusion for constructs like "inline int a(), b;" 3574 if (D.getDeclSpec().isInlineSpecified()) 3575 Diag(D.getDeclSpec().getInlineSpecLoc(), 3576 diag::err_inline_non_function); 3577 3578 if (D.getDeclSpec().isVirtualSpecified()) 3579 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3580 diag::err_virtual_non_function); 3581 3582 if (D.getDeclSpec().isExplicitSpecified()) 3583 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3584 diag::err_explicit_non_function); 3585} 3586 3587NamedDecl* 3588Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3589 TypeSourceInfo *TInfo, LookupResult &Previous) { 3590 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3591 if (D.getCXXScopeSpec().isSet()) { 3592 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3593 << D.getCXXScopeSpec().getRange(); 3594 D.setInvalidType(); 3595 // Pretend we didn't see the scope specifier. 3596 DC = CurContext; 3597 Previous.clear(); 3598 } 3599 3600 if (getLangOptions().CPlusPlus) { 3601 // Check that there are no default arguments (C++ only). 3602 CheckExtraCXXDefaultArguments(D); 3603 } 3604 3605 DiagnoseFunctionSpecifiers(D); 3606 3607 if (D.getDeclSpec().isThreadSpecified()) 3608 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3609 if (D.getDeclSpec().isConstexprSpecified()) 3610 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3611 << 1; 3612 3613 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3614 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3615 << D.getName().getSourceRange(); 3616 return 0; 3617 } 3618 3619 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3620 if (!NewTD) return 0; 3621 3622 // Handle attributes prior to checking for duplicates in MergeVarDecl 3623 ProcessDeclAttributes(S, NewTD, D); 3624 3625 CheckTypedefForVariablyModifiedType(S, NewTD); 3626 3627 bool Redeclaration = D.isRedeclaration(); 3628 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3629 D.setRedeclaration(Redeclaration); 3630 return ND; 3631} 3632 3633void 3634Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3635 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3636 // then it shall have block scope. 3637 // Note that variably modified types must be fixed before merging the decl so 3638 // that redeclarations will match. 3639 QualType T = NewTD->getUnderlyingType(); 3640 if (T->isVariablyModifiedType()) { 3641 getCurFunction()->setHasBranchProtectedScope(); 3642 3643 if (S->getFnParent() == 0) { 3644 bool SizeIsNegative; 3645 llvm::APSInt Oversized; 3646 QualType FixedTy = 3647 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3648 Oversized); 3649 if (!FixedTy.isNull()) { 3650 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3651 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3652 } else { 3653 if (SizeIsNegative) 3654 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3655 else if (T->isVariableArrayType()) 3656 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3657 else if (Oversized.getBoolValue()) 3658 Diag(NewTD->getLocation(), diag::err_array_too_large) 3659 << Oversized.toString(10); 3660 else 3661 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3662 NewTD->setInvalidDecl(); 3663 } 3664 } 3665 } 3666} 3667 3668 3669/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3670/// declares a typedef-name, either using the 'typedef' type specifier or via 3671/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3672NamedDecl* 3673Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3674 LookupResult &Previous, bool &Redeclaration) { 3675 // Merge the decl with the existing one if appropriate. If the decl is 3676 // in an outer scope, it isn't the same thing. 3677 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3678 /*ExplicitInstantiationOrSpecialization=*/false); 3679 if (!Previous.empty()) { 3680 Redeclaration = true; 3681 MergeTypedefNameDecl(NewTD, Previous); 3682 } 3683 3684 // If this is the C FILE type, notify the AST context. 3685 if (IdentifierInfo *II = NewTD->getIdentifier()) 3686 if (!NewTD->isInvalidDecl() && 3687 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3688 if (II->isStr("FILE")) 3689 Context.setFILEDecl(NewTD); 3690 else if (II->isStr("jmp_buf")) 3691 Context.setjmp_bufDecl(NewTD); 3692 else if (II->isStr("sigjmp_buf")) 3693 Context.setsigjmp_bufDecl(NewTD); 3694 else if (II->isStr("ucontext_t")) 3695 Context.setucontext_tDecl(NewTD); 3696 else if (II->isStr("__builtin_va_list")) 3697 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3698 } 3699 3700 return NewTD; 3701} 3702 3703/// \brief Determines whether the given declaration is an out-of-scope 3704/// previous declaration. 3705/// 3706/// This routine should be invoked when name lookup has found a 3707/// previous declaration (PrevDecl) that is not in the scope where a 3708/// new declaration by the same name is being introduced. If the new 3709/// declaration occurs in a local scope, previous declarations with 3710/// linkage may still be considered previous declarations (C99 3711/// 6.2.2p4-5, C++ [basic.link]p6). 3712/// 3713/// \param PrevDecl the previous declaration found by name 3714/// lookup 3715/// 3716/// \param DC the context in which the new declaration is being 3717/// declared. 3718/// 3719/// \returns true if PrevDecl is an out-of-scope previous declaration 3720/// for a new delcaration with the same name. 3721static bool 3722isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3723 ASTContext &Context) { 3724 if (!PrevDecl) 3725 return false; 3726 3727 if (!PrevDecl->hasLinkage()) 3728 return false; 3729 3730 if (Context.getLangOptions().CPlusPlus) { 3731 // C++ [basic.link]p6: 3732 // If there is a visible declaration of an entity with linkage 3733 // having the same name and type, ignoring entities declared 3734 // outside the innermost enclosing namespace scope, the block 3735 // scope declaration declares that same entity and receives the 3736 // linkage of the previous declaration. 3737 DeclContext *OuterContext = DC->getRedeclContext(); 3738 if (!OuterContext->isFunctionOrMethod()) 3739 // This rule only applies to block-scope declarations. 3740 return false; 3741 3742 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3743 if (PrevOuterContext->isRecord()) 3744 // We found a member function: ignore it. 3745 return false; 3746 3747 // Find the innermost enclosing namespace for the new and 3748 // previous declarations. 3749 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3750 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3751 3752 // The previous declaration is in a different namespace, so it 3753 // isn't the same function. 3754 if (!OuterContext->Equals(PrevOuterContext)) 3755 return false; 3756 } 3757 3758 return true; 3759} 3760 3761static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3762 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3763 if (!SS.isSet()) return; 3764 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3765} 3766 3767bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3768 QualType type = decl->getType(); 3769 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3770 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3771 // Various kinds of declaration aren't allowed to be __autoreleasing. 3772 unsigned kind = -1U; 3773 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3774 if (var->hasAttr<BlocksAttr>()) 3775 kind = 0; // __block 3776 else if (!var->hasLocalStorage()) 3777 kind = 1; // global 3778 } else if (isa<ObjCIvarDecl>(decl)) { 3779 kind = 3; // ivar 3780 } else if (isa<FieldDecl>(decl)) { 3781 kind = 2; // field 3782 } 3783 3784 if (kind != -1U) { 3785 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3786 << kind; 3787 } 3788 } else if (lifetime == Qualifiers::OCL_None) { 3789 // Try to infer lifetime. 3790 if (!type->isObjCLifetimeType()) 3791 return false; 3792 3793 lifetime = type->getObjCARCImplicitLifetime(); 3794 type = Context.getLifetimeQualifiedType(type, lifetime); 3795 decl->setType(type); 3796 } 3797 3798 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3799 // Thread-local variables cannot have lifetime. 3800 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3801 var->isThreadSpecified()) { 3802 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3803 << var->getType(); 3804 return true; 3805 } 3806 } 3807 3808 return false; 3809} 3810 3811NamedDecl* 3812Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3813 TypeSourceInfo *TInfo, LookupResult &Previous, 3814 MultiTemplateParamsArg TemplateParamLists) { 3815 QualType R = TInfo->getType(); 3816 DeclarationName Name = GetNameForDeclarator(D).getName(); 3817 3818 // Check that there are no default arguments (C++ only). 3819 if (getLangOptions().CPlusPlus) 3820 CheckExtraCXXDefaultArguments(D); 3821 3822 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3823 assert(SCSpec != DeclSpec::SCS_typedef && 3824 "Parser allowed 'typedef' as storage class VarDecl."); 3825 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3826 if (SCSpec == DeclSpec::SCS_mutable) { 3827 // mutable can only appear on non-static class members, so it's always 3828 // an error here 3829 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3830 D.setInvalidType(); 3831 SC = SC_None; 3832 } 3833 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3834 VarDecl::StorageClass SCAsWritten 3835 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3836 3837 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3838 if (!II) { 3839 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3840 << Name; 3841 return 0; 3842 } 3843 3844 DiagnoseFunctionSpecifiers(D); 3845 3846 if (!DC->isRecord() && S->getFnParent() == 0) { 3847 // C99 6.9p2: The storage-class specifiers auto and register shall not 3848 // appear in the declaration specifiers in an external declaration. 3849 if (SC == SC_Auto || SC == SC_Register) { 3850 3851 // If this is a register variable with an asm label specified, then this 3852 // is a GNU extension. 3853 if (SC == SC_Register && D.getAsmLabel()) 3854 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3855 else 3856 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3857 D.setInvalidType(); 3858 } 3859 } 3860 3861 if (getLangOptions().OpenCL) { 3862 // Set up the special work-group-local storage class for variables in the 3863 // OpenCL __local address space. 3864 if (R.getAddressSpace() == LangAS::opencl_local) 3865 SC = SC_OpenCLWorkGroupLocal; 3866 } 3867 3868 bool isExplicitSpecialization = false; 3869 VarDecl *NewVD; 3870 if (!getLangOptions().CPlusPlus) { 3871 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3872 D.getIdentifierLoc(), II, 3873 R, TInfo, SC, SCAsWritten); 3874 3875 if (D.isInvalidType()) 3876 NewVD->setInvalidDecl(); 3877 } else { 3878 if (DC->isRecord() && !CurContext->isRecord()) { 3879 // This is an out-of-line definition of a static data member. 3880 if (SC == SC_Static) { 3881 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3882 diag::err_static_out_of_line) 3883 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3884 } else if (SC == SC_None) 3885 SC = SC_Static; 3886 } 3887 if (SC == SC_Static) { 3888 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3889 if (RD->isLocalClass()) 3890 Diag(D.getIdentifierLoc(), 3891 diag::err_static_data_member_not_allowed_in_local_class) 3892 << Name << RD->getDeclName(); 3893 3894 // C++ [class.union]p1: If a union contains a static data member, 3895 // the program is ill-formed. 3896 // 3897 // We also disallow static data members in anonymous structs. 3898 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3899 Diag(D.getIdentifierLoc(), 3900 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3901 << Name << RD->isUnion(); 3902 } 3903 } 3904 3905 // Match up the template parameter lists with the scope specifier, then 3906 // determine whether we have a template or a template specialization. 3907 isExplicitSpecialization = false; 3908 bool Invalid = false; 3909 if (TemplateParameterList *TemplateParams 3910 = MatchTemplateParametersToScopeSpecifier( 3911 D.getDeclSpec().getSourceRange().getBegin(), 3912 D.getIdentifierLoc(), 3913 D.getCXXScopeSpec(), 3914 TemplateParamLists.get(), 3915 TemplateParamLists.size(), 3916 /*never a friend*/ false, 3917 isExplicitSpecialization, 3918 Invalid)) { 3919 if (TemplateParams->size() > 0) { 3920 // There is no such thing as a variable template. 3921 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3922 << II 3923 << SourceRange(TemplateParams->getTemplateLoc(), 3924 TemplateParams->getRAngleLoc()); 3925 return 0; 3926 } else { 3927 // There is an extraneous 'template<>' for this variable. Complain 3928 // about it, but allow the declaration of the variable. 3929 Diag(TemplateParams->getTemplateLoc(), 3930 diag::err_template_variable_noparams) 3931 << II 3932 << SourceRange(TemplateParams->getTemplateLoc(), 3933 TemplateParams->getRAngleLoc()); 3934 } 3935 } 3936 3937 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3938 D.getIdentifierLoc(), II, 3939 R, TInfo, SC, SCAsWritten); 3940 3941 // If this decl has an auto type in need of deduction, make a note of the 3942 // Decl so we can diagnose uses of it in its own initializer. 3943 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3944 R->getContainedAutoType()) 3945 ParsingInitForAutoVars.insert(NewVD); 3946 3947 if (D.isInvalidType() || Invalid) 3948 NewVD->setInvalidDecl(); 3949 3950 SetNestedNameSpecifier(NewVD, D); 3951 3952 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3953 NewVD->setTemplateParameterListsInfo(Context, 3954 TemplateParamLists.size(), 3955 TemplateParamLists.release()); 3956 } 3957 3958 if (D.getDeclSpec().isConstexprSpecified()) 3959 NewVD->setConstexpr(true); 3960 } 3961 3962 // Set the lexical context. If the declarator has a C++ scope specifier, the 3963 // lexical context will be different from the semantic context. 3964 NewVD->setLexicalDeclContext(CurContext); 3965 3966 if (D.getDeclSpec().isThreadSpecified()) { 3967 if (NewVD->hasLocalStorage()) 3968 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3969 else if (!Context.getTargetInfo().isTLSSupported()) 3970 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3971 else 3972 NewVD->setThreadSpecified(true); 3973 } 3974 3975 if (D.getDeclSpec().isModulePrivateSpecified()) { 3976 if (isExplicitSpecialization) 3977 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3978 << 2 3979 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3980 else if (NewVD->hasLocalStorage()) 3981 Diag(NewVD->getLocation(), diag::err_module_private_local) 3982 << 0 << NewVD->getDeclName() 3983 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3984 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3985 else 3986 NewVD->setModulePrivate(); 3987 } 3988 3989 // Handle attributes prior to checking for duplicates in MergeVarDecl 3990 ProcessDeclAttributes(S, NewVD, D); 3991 3992 // In auto-retain/release, infer strong retension for variables of 3993 // retainable type. 3994 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3995 NewVD->setInvalidDecl(); 3996 3997 // Handle GNU asm-label extension (encoded as an attribute). 3998 if (Expr *E = (Expr*)D.getAsmLabel()) { 3999 // The parser guarantees this is a string. 4000 StringLiteral *SE = cast<StringLiteral>(E); 4001 StringRef Label = SE->getString(); 4002 if (S->getFnParent() != 0) { 4003 switch (SC) { 4004 case SC_None: 4005 case SC_Auto: 4006 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4007 break; 4008 case SC_Register: 4009 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4010 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4011 break; 4012 case SC_Static: 4013 case SC_Extern: 4014 case SC_PrivateExtern: 4015 case SC_OpenCLWorkGroupLocal: 4016 break; 4017 } 4018 } 4019 4020 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4021 Context, Label)); 4022 } 4023 4024 // Diagnose shadowed variables before filtering for scope. 4025 if (!D.getCXXScopeSpec().isSet()) 4026 CheckShadow(S, NewVD, Previous); 4027 4028 // Don't consider existing declarations that are in a different 4029 // scope and are out-of-semantic-context declarations (if the new 4030 // declaration has linkage). 4031 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4032 isExplicitSpecialization); 4033 4034 if (!getLangOptions().CPlusPlus) { 4035 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4036 } else { 4037 // Merge the decl with the existing one if appropriate. 4038 if (!Previous.empty()) { 4039 if (Previous.isSingleResult() && 4040 isa<FieldDecl>(Previous.getFoundDecl()) && 4041 D.getCXXScopeSpec().isSet()) { 4042 // The user tried to define a non-static data member 4043 // out-of-line (C++ [dcl.meaning]p1). 4044 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4045 << D.getCXXScopeSpec().getRange(); 4046 Previous.clear(); 4047 NewVD->setInvalidDecl(); 4048 } 4049 } else if (D.getCXXScopeSpec().isSet()) { 4050 // No previous declaration in the qualifying scope. 4051 Diag(D.getIdentifierLoc(), diag::err_no_member) 4052 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4053 << D.getCXXScopeSpec().getRange(); 4054 NewVD->setInvalidDecl(); 4055 } 4056 4057 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4058 4059 // This is an explicit specialization of a static data member. Check it. 4060 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4061 CheckMemberSpecialization(NewVD, Previous)) 4062 NewVD->setInvalidDecl(); 4063 } 4064 4065 // attributes declared post-definition are currently ignored 4066 // FIXME: This should be handled in attribute merging, not 4067 // here. 4068 if (Previous.isSingleResult()) { 4069 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4070 if (Def && (Def = Def->getDefinition()) && 4071 Def != NewVD && D.hasAttributes()) { 4072 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4073 Diag(Def->getLocation(), diag::note_previous_definition); 4074 } 4075 } 4076 4077 // If this is a locally-scoped extern C variable, update the map of 4078 // such variables. 4079 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4080 !NewVD->isInvalidDecl()) 4081 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4082 4083 // If there's a #pragma GCC visibility in scope, and this isn't a class 4084 // member, set the visibility of this variable. 4085 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4086 AddPushedVisibilityAttribute(NewVD); 4087 4088 MarkUnusedFileScopedDecl(NewVD); 4089 4090 return NewVD; 4091} 4092 4093/// \brief Diagnose variable or built-in function shadowing. Implements 4094/// -Wshadow. 4095/// 4096/// This method is called whenever a VarDecl is added to a "useful" 4097/// scope. 4098/// 4099/// \param S the scope in which the shadowing name is being declared 4100/// \param R the lookup of the name 4101/// 4102void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4103 // Return if warning is ignored. 4104 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4105 DiagnosticsEngine::Ignored) 4106 return; 4107 4108 // Don't diagnose declarations at file scope. 4109 if (D->hasGlobalStorage()) 4110 return; 4111 4112 DeclContext *NewDC = D->getDeclContext(); 4113 4114 // Only diagnose if we're shadowing an unambiguous field or variable. 4115 if (R.getResultKind() != LookupResult::Found) 4116 return; 4117 4118 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4119 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4120 return; 4121 4122 // Fields are not shadowed by variables in C++ static methods. 4123 if (isa<FieldDecl>(ShadowedDecl)) 4124 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4125 if (MD->isStatic()) 4126 return; 4127 4128 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4129 if (shadowedVar->isExternC()) { 4130 // For shadowing external vars, make sure that we point to the global 4131 // declaration, not a locally scoped extern declaration. 4132 for (VarDecl::redecl_iterator 4133 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4134 I != E; ++I) 4135 if (I->isFileVarDecl()) { 4136 ShadowedDecl = *I; 4137 break; 4138 } 4139 } 4140 4141 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4142 4143 // Only warn about certain kinds of shadowing for class members. 4144 if (NewDC && NewDC->isRecord()) { 4145 // In particular, don't warn about shadowing non-class members. 4146 if (!OldDC->isRecord()) 4147 return; 4148 4149 // TODO: should we warn about static data members shadowing 4150 // static data members from base classes? 4151 4152 // TODO: don't diagnose for inaccessible shadowed members. 4153 // This is hard to do perfectly because we might friend the 4154 // shadowing context, but that's just a false negative. 4155 } 4156 4157 // Determine what kind of declaration we're shadowing. 4158 unsigned Kind; 4159 if (isa<RecordDecl>(OldDC)) { 4160 if (isa<FieldDecl>(ShadowedDecl)) 4161 Kind = 3; // field 4162 else 4163 Kind = 2; // static data member 4164 } else if (OldDC->isFileContext()) 4165 Kind = 1; // global 4166 else 4167 Kind = 0; // local 4168 4169 DeclarationName Name = R.getLookupName(); 4170 4171 // Emit warning and note. 4172 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4173 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4174} 4175 4176/// \brief Check -Wshadow without the advantage of a previous lookup. 4177void Sema::CheckShadow(Scope *S, VarDecl *D) { 4178 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4179 DiagnosticsEngine::Ignored) 4180 return; 4181 4182 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4183 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4184 LookupName(R, S); 4185 CheckShadow(S, D, R); 4186} 4187 4188/// \brief Perform semantic checking on a newly-created variable 4189/// declaration. 4190/// 4191/// This routine performs all of the type-checking required for a 4192/// variable declaration once it has been built. It is used both to 4193/// check variables after they have been parsed and their declarators 4194/// have been translated into a declaration, and to check variables 4195/// that have been instantiated from a template. 4196/// 4197/// Sets NewVD->isInvalidDecl() if an error was encountered. 4198/// 4199/// Returns true if the variable declaration is a redeclaration. 4200bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4201 LookupResult &Previous) { 4202 // If the decl is already known invalid, don't check it. 4203 if (NewVD->isInvalidDecl()) 4204 return false; 4205 4206 QualType T = NewVD->getType(); 4207 4208 if (T->isObjCObjectType()) { 4209 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4210 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4211 T = Context.getObjCObjectPointerType(T); 4212 NewVD->setType(T); 4213 } 4214 4215 // Emit an error if an address space was applied to decl with local storage. 4216 // This includes arrays of objects with address space qualifiers, but not 4217 // automatic variables that point to other address spaces. 4218 // ISO/IEC TR 18037 S5.1.2 4219 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4220 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4221 NewVD->setInvalidDecl(); 4222 return false; 4223 } 4224 4225 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4226 && !NewVD->hasAttr<BlocksAttr>()) { 4227 if (getLangOptions().getGC() != LangOptions::NonGC) 4228 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4229 else 4230 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4231 } 4232 4233 bool isVM = T->isVariablyModifiedType(); 4234 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4235 NewVD->hasAttr<BlocksAttr>()) 4236 getCurFunction()->setHasBranchProtectedScope(); 4237 4238 if ((isVM && NewVD->hasLinkage()) || 4239 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4240 bool SizeIsNegative; 4241 llvm::APSInt Oversized; 4242 QualType FixedTy = 4243 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4244 Oversized); 4245 4246 if (FixedTy.isNull() && T->isVariableArrayType()) { 4247 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4248 // FIXME: This won't give the correct result for 4249 // int a[10][n]; 4250 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4251 4252 if (NewVD->isFileVarDecl()) 4253 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4254 << SizeRange; 4255 else if (NewVD->getStorageClass() == SC_Static) 4256 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4257 << SizeRange; 4258 else 4259 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4260 << SizeRange; 4261 NewVD->setInvalidDecl(); 4262 return false; 4263 } 4264 4265 if (FixedTy.isNull()) { 4266 if (NewVD->isFileVarDecl()) 4267 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4268 else 4269 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4270 NewVD->setInvalidDecl(); 4271 return false; 4272 } 4273 4274 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4275 NewVD->setType(FixedTy); 4276 } 4277 4278 if (Previous.empty() && NewVD->isExternC()) { 4279 // Since we did not find anything by this name and we're declaring 4280 // an extern "C" variable, look for a non-visible extern "C" 4281 // declaration with the same name. 4282 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4283 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4284 if (Pos != LocallyScopedExternalDecls.end()) 4285 Previous.addDecl(Pos->second); 4286 } 4287 4288 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4289 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4290 << T; 4291 NewVD->setInvalidDecl(); 4292 return false; 4293 } 4294 4295 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4296 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4297 NewVD->setInvalidDecl(); 4298 return false; 4299 } 4300 4301 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4302 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4303 NewVD->setInvalidDecl(); 4304 return false; 4305 } 4306 4307 // Function pointers and references cannot have qualified function type, only 4308 // function pointer-to-members can do that. 4309 QualType Pointee; 4310 unsigned PtrOrRef = 0; 4311 if (const PointerType *Ptr = T->getAs<PointerType>()) 4312 Pointee = Ptr->getPointeeType(); 4313 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4314 Pointee = Ref->getPointeeType(); 4315 PtrOrRef = 1; 4316 } 4317 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4318 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4319 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4320 << PtrOrRef; 4321 NewVD->setInvalidDecl(); 4322 return false; 4323 } 4324 4325 if (!Previous.empty()) { 4326 MergeVarDecl(NewVD, Previous); 4327 return true; 4328 } 4329 return false; 4330} 4331 4332/// \brief Data used with FindOverriddenMethod 4333struct FindOverriddenMethodData { 4334 Sema *S; 4335 CXXMethodDecl *Method; 4336}; 4337 4338/// \brief Member lookup function that determines whether a given C++ 4339/// method overrides a method in a base class, to be used with 4340/// CXXRecordDecl::lookupInBases(). 4341static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4342 CXXBasePath &Path, 4343 void *UserData) { 4344 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4345 4346 FindOverriddenMethodData *Data 4347 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4348 4349 DeclarationName Name = Data->Method->getDeclName(); 4350 4351 // FIXME: Do we care about other names here too? 4352 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4353 // We really want to find the base class destructor here. 4354 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4355 CanQualType CT = Data->S->Context.getCanonicalType(T); 4356 4357 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4358 } 4359 4360 for (Path.Decls = BaseRecord->lookup(Name); 4361 Path.Decls.first != Path.Decls.second; 4362 ++Path.Decls.first) { 4363 NamedDecl *D = *Path.Decls.first; 4364 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4365 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4366 return true; 4367 } 4368 } 4369 4370 return false; 4371} 4372 4373/// AddOverriddenMethods - See if a method overrides any in the base classes, 4374/// and if so, check that it's a valid override and remember it. 4375bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4376 // Look for virtual methods in base classes that this method might override. 4377 CXXBasePaths Paths; 4378 FindOverriddenMethodData Data; 4379 Data.Method = MD; 4380 Data.S = this; 4381 bool AddedAny = false; 4382 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4383 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4384 E = Paths.found_decls_end(); I != E; ++I) { 4385 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4386 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4387 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4388 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4389 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4390 AddedAny = true; 4391 } 4392 } 4393 } 4394 } 4395 4396 return AddedAny; 4397} 4398 4399namespace { 4400 // Struct for holding all of the extra arguments needed by 4401 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4402 struct ActOnFDArgs { 4403 Scope *S; 4404 Declarator &D; 4405 MultiTemplateParamsArg TemplateParamLists; 4406 bool AddToScope; 4407 }; 4408} 4409 4410/// \brief Generate diagnostics for an invalid function redeclaration. 4411/// 4412/// This routine handles generating the diagnostic messages for an invalid 4413/// function redeclaration, including finding possible similar declarations 4414/// or performing typo correction if there are no previous declarations with 4415/// the same name. 4416/// 4417/// Returns a NamedDecl iff typo correction was performed and substituting in 4418/// the new declaration name does not cause new errors. 4419static NamedDecl* DiagnoseInvalidRedeclaration( 4420 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4421 ActOnFDArgs &ExtraArgs) { 4422 NamedDecl *Result = NULL; 4423 DeclarationName Name = NewFD->getDeclName(); 4424 DeclContext *NewDC = NewFD->getDeclContext(); 4425 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4426 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4427 llvm::SmallVector<unsigned, 1> MismatchedParams; 4428 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4429 TypoCorrection Correction; 4430 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4431 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4432 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4433 : diag::err_member_def_does_not_match; 4434 4435 NewFD->setInvalidDecl(); 4436 SemaRef.LookupQualifiedName(Prev, NewDC); 4437 assert(!Prev.isAmbiguous() && 4438 "Cannot have an ambiguity in previous-declaration lookup"); 4439 if (!Prev.empty()) { 4440 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4441 Func != FuncEnd; ++Func) { 4442 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4443 if (FD && 4444 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4445 // Add 1 to the index so that 0 can mean the mismatch didn't 4446 // involve a parameter 4447 unsigned ParamNum = 4448 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4449 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4450 } 4451 } 4452 // If the qualified name lookup yielded nothing, try typo correction 4453 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4454 Prev.getLookupKind(), 0, 0, NewDC)) && 4455 Correction.getCorrection() != Name) { 4456 // Trap errors. 4457 Sema::SFINAETrap Trap(SemaRef); 4458 4459 // Set up everything for the call to ActOnFunctionDeclarator 4460 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4461 ExtraArgs.D.getIdentifierLoc()); 4462 Previous.clear(); 4463 Previous.setLookupName(Correction.getCorrection()); 4464 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4465 CDeclEnd = Correction.end(); 4466 CDecl != CDeclEnd; ++CDecl) { 4467 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4468 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4469 MismatchedParams)) { 4470 Previous.addDecl(FD); 4471 } 4472 } 4473 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4474 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4475 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4476 // eliminate the need for the parameter pack ExtraArgs. 4477 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4478 NewFD->getDeclContext(), 4479 NewFD->getTypeSourceInfo(), 4480 Previous, 4481 ExtraArgs.TemplateParamLists, 4482 ExtraArgs.AddToScope); 4483 if (Trap.hasErrorOccurred()) { 4484 // Pretend the typo correction never occurred 4485 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4486 ExtraArgs.D.getIdentifierLoc()); 4487 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4488 Previous.clear(); 4489 Previous.setLookupName(Name); 4490 Result = NULL; 4491 } else { 4492 for (LookupResult::iterator Func = Previous.begin(), 4493 FuncEnd = Previous.end(); 4494 Func != FuncEnd; ++Func) { 4495 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4496 NearMatches.push_back(std::make_pair(FD, 0)); 4497 } 4498 } 4499 if (NearMatches.empty()) { 4500 // Ignore the correction if it didn't yield any close FunctionDecl matches 4501 Correction = TypoCorrection(); 4502 } else { 4503 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4504 : diag::err_member_def_does_not_match_suggest; 4505 } 4506 } 4507 4508 if (Correction) 4509 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4510 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4511 << FixItHint::CreateReplacement( 4512 NewFD->getLocation(), 4513 Correction.getAsString(SemaRef.getLangOptions())); 4514 else 4515 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4516 << Name << NewDC << NewFD->getLocation(); 4517 4518 bool NewFDisConst = false; 4519 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4520 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4521 4522 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4523 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4524 NearMatch != NearMatchEnd; ++NearMatch) { 4525 FunctionDecl *FD = NearMatch->first; 4526 bool FDisConst = false; 4527 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4528 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4529 4530 if (unsigned Idx = NearMatch->second) { 4531 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4532 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4533 diag::note_member_def_close_param_match) 4534 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4535 } else if (Correction) { 4536 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4537 << Correction.getQuoted(SemaRef.getLangOptions()); 4538 } else if (FDisConst != NewFDisConst) { 4539 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4540 << NewFDisConst << FD->getSourceRange().getEnd(); 4541 } else 4542 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4543 } 4544 return Result; 4545} 4546 4547static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4548 Declarator &D) { 4549 switch (D.getDeclSpec().getStorageClassSpec()) { 4550 default: llvm_unreachable("Unknown storage class!"); 4551 case DeclSpec::SCS_auto: 4552 case DeclSpec::SCS_register: 4553 case DeclSpec::SCS_mutable: 4554 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4555 diag::err_typecheck_sclass_func); 4556 D.setInvalidType(); 4557 break; 4558 case DeclSpec::SCS_unspecified: break; 4559 case DeclSpec::SCS_extern: return SC_Extern; 4560 case DeclSpec::SCS_static: { 4561 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4562 // C99 6.7.1p5: 4563 // The declaration of an identifier for a function that has 4564 // block scope shall have no explicit storage-class specifier 4565 // other than extern 4566 // See also (C++ [dcl.stc]p4). 4567 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4568 diag::err_static_block_func); 4569 break; 4570 } else 4571 return SC_Static; 4572 } 4573 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4574 } 4575 4576 // No explicit storage class has already been returned 4577 return SC_None; 4578} 4579 4580static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4581 DeclContext *DC, QualType &R, 4582 TypeSourceInfo *TInfo, 4583 FunctionDecl::StorageClass SC, 4584 bool &IsVirtualOkay) { 4585 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4586 DeclarationName Name = NameInfo.getName(); 4587 4588 FunctionDecl *NewFD = 0; 4589 bool isInline = D.getDeclSpec().isInlineSpecified(); 4590 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4591 FunctionDecl::StorageClass SCAsWritten 4592 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4593 4594 if (!SemaRef.getLangOptions().CPlusPlus) { 4595 // Determine whether the function was written with a 4596 // prototype. This true when: 4597 // - there is a prototype in the declarator, or 4598 // - the type R of the function is some kind of typedef or other reference 4599 // to a type name (which eventually refers to a function type). 4600 bool HasPrototype = 4601 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4602 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4603 4604 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4605 D.getSourceRange().getBegin(), NameInfo, R, 4606 TInfo, SC, SCAsWritten, isInline, 4607 HasPrototype); 4608 if (D.isInvalidType()) 4609 NewFD->setInvalidDecl(); 4610 4611 // Set the lexical context. 4612 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4613 4614 return NewFD; 4615 } 4616 4617 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4618 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4619 4620 // Check that the return type is not an abstract class type. 4621 // For record types, this is done by the AbstractClassUsageDiagnoser once 4622 // the class has been completely parsed. 4623 if (!DC->isRecord() && 4624 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4625 R->getAs<FunctionType>()->getResultType(), 4626 diag::err_abstract_type_in_decl, 4627 SemaRef.AbstractReturnType)) 4628 D.setInvalidType(); 4629 4630 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4631 // This is a C++ constructor declaration. 4632 assert(DC->isRecord() && 4633 "Constructors can only be declared in a member context"); 4634 4635 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4636 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4637 D.getSourceRange().getBegin(), NameInfo, 4638 R, TInfo, isExplicit, isInline, 4639 /*isImplicitlyDeclared=*/false, 4640 isConstexpr); 4641 4642 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4643 // This is a C++ destructor declaration. 4644 if (DC->isRecord()) { 4645 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4646 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4647 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4648 SemaRef.Context, Record, 4649 D.getSourceRange().getBegin(), 4650 NameInfo, R, TInfo, isInline, 4651 /*isImplicitlyDeclared=*/false); 4652 4653 // If the class is complete, then we now create the implicit exception 4654 // specification. If the class is incomplete or dependent, we can't do 4655 // it yet. 4656 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4657 Record->getDefinition() && !Record->isBeingDefined() && 4658 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4659 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4660 } 4661 4662 IsVirtualOkay = true; 4663 return NewDD; 4664 4665 } else { 4666 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4667 D.setInvalidType(); 4668 4669 // Create a FunctionDecl to satisfy the function definition parsing 4670 // code path. 4671 return FunctionDecl::Create(SemaRef.Context, DC, 4672 D.getSourceRange().getBegin(), 4673 D.getIdentifierLoc(), Name, R, TInfo, 4674 SC, SCAsWritten, isInline, 4675 /*hasPrototype=*/true, isConstexpr); 4676 } 4677 4678 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4679 if (!DC->isRecord()) { 4680 SemaRef.Diag(D.getIdentifierLoc(), 4681 diag::err_conv_function_not_member); 4682 return 0; 4683 } 4684 4685 SemaRef.CheckConversionDeclarator(D, R, SC); 4686 IsVirtualOkay = true; 4687 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4688 D.getSourceRange().getBegin(), NameInfo, 4689 R, TInfo, isInline, isExplicit, 4690 isConstexpr, SourceLocation()); 4691 4692 } else if (DC->isRecord()) { 4693 // If the name of the function is the same as the name of the record, 4694 // then this must be an invalid constructor that has a return type. 4695 // (The parser checks for a return type and makes the declarator a 4696 // constructor if it has no return type). 4697 if (Name.getAsIdentifierInfo() && 4698 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4699 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4700 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4701 << SourceRange(D.getIdentifierLoc()); 4702 return 0; 4703 } 4704 4705 bool isStatic = SC == SC_Static; 4706 4707 // [class.free]p1: 4708 // Any allocation function for a class T is a static member 4709 // (even if not explicitly declared static). 4710 if (Name.getCXXOverloadedOperator() == OO_New || 4711 Name.getCXXOverloadedOperator() == OO_Array_New) 4712 isStatic = true; 4713 4714 // [class.free]p6 Any deallocation function for a class X is a static member 4715 // (even if not explicitly declared static). 4716 if (Name.getCXXOverloadedOperator() == OO_Delete || 4717 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4718 isStatic = true; 4719 4720 IsVirtualOkay = !isStatic; 4721 4722 // This is a C++ method declaration. 4723 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4724 D.getSourceRange().getBegin(), NameInfo, R, 4725 TInfo, isStatic, SCAsWritten, isInline, 4726 isConstexpr, SourceLocation()); 4727 4728 } else { 4729 // Determine whether the function was written with a 4730 // prototype. This true when: 4731 // - we're in C++ (where every function has a prototype), 4732 return FunctionDecl::Create(SemaRef.Context, DC, 4733 D.getSourceRange().getBegin(), 4734 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4735 true/*HasPrototype*/, isConstexpr); 4736 } 4737} 4738 4739NamedDecl* 4740Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4741 TypeSourceInfo *TInfo, LookupResult &Previous, 4742 MultiTemplateParamsArg TemplateParamLists, 4743 bool &AddToScope) { 4744 QualType R = TInfo->getType(); 4745 4746 assert(R.getTypePtr()->isFunctionType()); 4747 4748 // TODO: consider using NameInfo for diagnostic. 4749 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4750 DeclarationName Name = NameInfo.getName(); 4751 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4752 4753 if (D.getDeclSpec().isThreadSpecified()) 4754 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4755 4756 // Do not allow returning a objc interface by-value. 4757 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4758 Diag(D.getIdentifierLoc(), 4759 diag::err_object_cannot_be_passed_returned_by_value) << 0 4760 << R->getAs<FunctionType>()->getResultType() 4761 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4762 4763 QualType T = R->getAs<FunctionType>()->getResultType(); 4764 T = Context.getObjCObjectPointerType(T); 4765 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4766 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4767 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4768 FPT->getNumArgs(), EPI); 4769 } 4770 else if (isa<FunctionNoProtoType>(R)) 4771 R = Context.getFunctionNoProtoType(T); 4772 } 4773 4774 bool isFriend = false; 4775 FunctionTemplateDecl *FunctionTemplate = 0; 4776 bool isExplicitSpecialization = false; 4777 bool isFunctionTemplateSpecialization = false; 4778 bool isDependentClassScopeExplicitSpecialization = false; 4779 bool isVirtualOkay = false; 4780 4781 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4782 isVirtualOkay); 4783 if (!NewFD) return 0; 4784 4785 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4786 NewFD->setTopLevelDeclInObjCContainer(); 4787 4788 if (getLangOptions().CPlusPlus) { 4789 bool isInline = D.getDeclSpec().isInlineSpecified(); 4790 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4791 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4792 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4793 isFriend = D.getDeclSpec().isFriendSpecified(); 4794 if (isFriend && !isInline && D.isFunctionDefinition()) { 4795 // C++ [class.friend]p5 4796 // A function can be defined in a friend declaration of a 4797 // class . . . . Such a function is implicitly inline. 4798 NewFD->setImplicitlyInline(); 4799 } 4800 4801 SetNestedNameSpecifier(NewFD, D); 4802 isExplicitSpecialization = false; 4803 isFunctionTemplateSpecialization = false; 4804 if (D.isInvalidType()) 4805 NewFD->setInvalidDecl(); 4806 4807 // Set the lexical context. If the declarator has a C++ 4808 // scope specifier, or is the object of a friend declaration, the 4809 // lexical context will be different from the semantic context. 4810 NewFD->setLexicalDeclContext(CurContext); 4811 4812 // Match up the template parameter lists with the scope specifier, then 4813 // determine whether we have a template or a template specialization. 4814 bool Invalid = false; 4815 if (TemplateParameterList *TemplateParams 4816 = MatchTemplateParametersToScopeSpecifier( 4817 D.getDeclSpec().getSourceRange().getBegin(), 4818 D.getIdentifierLoc(), 4819 D.getCXXScopeSpec(), 4820 TemplateParamLists.get(), 4821 TemplateParamLists.size(), 4822 isFriend, 4823 isExplicitSpecialization, 4824 Invalid)) { 4825 if (TemplateParams->size() > 0) { 4826 // This is a function template 4827 4828 // Check that we can declare a template here. 4829 if (CheckTemplateDeclScope(S, TemplateParams)) 4830 return 0; 4831 4832 // A destructor cannot be a template. 4833 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4834 Diag(NewFD->getLocation(), diag::err_destructor_template); 4835 return 0; 4836 } 4837 4838 // If we're adding a template to a dependent context, we may need to 4839 // rebuilding some of the types used within the template parameter list, 4840 // now that we know what the current instantiation is. 4841 if (DC->isDependentContext()) { 4842 ContextRAII SavedContext(*this, DC); 4843 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4844 Invalid = true; 4845 } 4846 4847 4848 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4849 NewFD->getLocation(), 4850 Name, TemplateParams, 4851 NewFD); 4852 FunctionTemplate->setLexicalDeclContext(CurContext); 4853 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4854 4855 // For source fidelity, store the other template param lists. 4856 if (TemplateParamLists.size() > 1) { 4857 NewFD->setTemplateParameterListsInfo(Context, 4858 TemplateParamLists.size() - 1, 4859 TemplateParamLists.release()); 4860 } 4861 } else { 4862 // This is a function template specialization. 4863 isFunctionTemplateSpecialization = true; 4864 // For source fidelity, store all the template param lists. 4865 NewFD->setTemplateParameterListsInfo(Context, 4866 TemplateParamLists.size(), 4867 TemplateParamLists.release()); 4868 4869 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4870 if (isFriend) { 4871 // We want to remove the "template<>", found here. 4872 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4873 4874 // If we remove the template<> and the name is not a 4875 // template-id, we're actually silently creating a problem: 4876 // the friend declaration will refer to an untemplated decl, 4877 // and clearly the user wants a template specialization. So 4878 // we need to insert '<>' after the name. 4879 SourceLocation InsertLoc; 4880 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4881 InsertLoc = D.getName().getSourceRange().getEnd(); 4882 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4883 } 4884 4885 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4886 << Name << RemoveRange 4887 << FixItHint::CreateRemoval(RemoveRange) 4888 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4889 } 4890 } 4891 } 4892 else { 4893 // All template param lists were matched against the scope specifier: 4894 // this is NOT (an explicit specialization of) a template. 4895 if (TemplateParamLists.size() > 0) 4896 // For source fidelity, store all the template param lists. 4897 NewFD->setTemplateParameterListsInfo(Context, 4898 TemplateParamLists.size(), 4899 TemplateParamLists.release()); 4900 } 4901 4902 if (Invalid) { 4903 NewFD->setInvalidDecl(); 4904 if (FunctionTemplate) 4905 FunctionTemplate->setInvalidDecl(); 4906 } 4907 4908 // If we see "T var();" at block scope, where T is a class type, it is 4909 // probably an attempt to initialize a variable, not a function declaration. 4910 // We don't catch this case earlier, since there is no ambiguity here. 4911 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4912 CurContext->isFunctionOrMethod() && 4913 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4914 D.getDeclSpec().getStorageClassSpecAsWritten() 4915 == DeclSpec::SCS_unspecified) { 4916 QualType T = R->getAs<FunctionType>()->getResultType(); 4917 DeclaratorChunk &C = D.getTypeObject(0); 4918 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4919 !C.Fun.TrailingReturnType && 4920 C.Fun.getExceptionSpecType() == EST_None) { 4921 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) 4922 << SourceRange(C.Loc, C.EndLoc); 4923 } 4924 } 4925 4926 // C++ [dcl.fct.spec]p5: 4927 // The virtual specifier shall only be used in declarations of 4928 // nonstatic class member functions that appear within a 4929 // member-specification of a class declaration; see 10.3. 4930 // 4931 if (isVirtual && !NewFD->isInvalidDecl()) { 4932 if (!isVirtualOkay) { 4933 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4934 diag::err_virtual_non_function); 4935 } else if (!CurContext->isRecord()) { 4936 // 'virtual' was specified outside of the class. 4937 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4938 diag::err_virtual_out_of_class) 4939 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4940 } else if (NewFD->getDescribedFunctionTemplate()) { 4941 // C++ [temp.mem]p3: 4942 // A member function template shall not be virtual. 4943 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4944 diag::err_virtual_member_function_template) 4945 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4946 } else { 4947 // Okay: Add virtual to the method. 4948 NewFD->setVirtualAsWritten(true); 4949 } 4950 } 4951 4952 // C++ [dcl.fct.spec]p3: 4953 // The inline specifier shall not appear on a block scope function 4954 // declaration. 4955 if (isInline && !NewFD->isInvalidDecl()) { 4956 if (CurContext->isFunctionOrMethod()) { 4957 // 'inline' is not allowed on block scope function declaration. 4958 Diag(D.getDeclSpec().getInlineSpecLoc(), 4959 diag::err_inline_declaration_block_scope) << Name 4960 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4961 } 4962 } 4963 4964 // C++ [dcl.fct.spec]p6: 4965 // The explicit specifier shall be used only in the declaration of a 4966 // constructor or conversion function within its class definition; 4967 // see 12.3.1 and 12.3.2. 4968 if (isExplicit && !NewFD->isInvalidDecl()) { 4969 if (!CurContext->isRecord()) { 4970 // 'explicit' was specified outside of the class. 4971 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4972 diag::err_explicit_out_of_class) 4973 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4974 } else if (!isa<CXXConstructorDecl>(NewFD) && 4975 !isa<CXXConversionDecl>(NewFD)) { 4976 // 'explicit' was specified on a function that wasn't a constructor 4977 // or conversion function. 4978 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4979 diag::err_explicit_non_ctor_or_conv_function) 4980 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4981 } 4982 } 4983 4984 if (isConstexpr) { 4985 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4986 // are implicitly inline. 4987 NewFD->setImplicitlyInline(); 4988 4989 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4990 // be either constructors or to return a literal type. Therefore, 4991 // destructors cannot be declared constexpr. 4992 if (isa<CXXDestructorDecl>(NewFD)) 4993 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4994 } 4995 4996 // If __module_private__ was specified, mark the function accordingly. 4997 if (D.getDeclSpec().isModulePrivateSpecified()) { 4998 if (isFunctionTemplateSpecialization) { 4999 SourceLocation ModulePrivateLoc 5000 = D.getDeclSpec().getModulePrivateSpecLoc(); 5001 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5002 << 0 5003 << FixItHint::CreateRemoval(ModulePrivateLoc); 5004 } else { 5005 NewFD->setModulePrivate(); 5006 if (FunctionTemplate) 5007 FunctionTemplate->setModulePrivate(); 5008 } 5009 } 5010 5011 if (isFriend) { 5012 // For now, claim that the objects have no previous declaration. 5013 if (FunctionTemplate) { 5014 FunctionTemplate->setObjectOfFriendDecl(false); 5015 FunctionTemplate->setAccess(AS_public); 5016 } 5017 NewFD->setObjectOfFriendDecl(false); 5018 NewFD->setAccess(AS_public); 5019 } 5020 5021 // If a function is defined as defaulted or deleted, mark it as such now. 5022 switch (D.getFunctionDefinitionKind()) { 5023 case FDK_Declaration: 5024 case FDK_Definition: 5025 break; 5026 5027 case FDK_Defaulted: 5028 NewFD->setDefaulted(); 5029 break; 5030 5031 case FDK_Deleted: 5032 NewFD->setDeletedAsWritten(); 5033 break; 5034 } 5035 5036 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5037 D.isFunctionDefinition()) { 5038 // C++ [class.mfct]p2: 5039 // A member function may be defined (8.4) in its class definition, in 5040 // which case it is an inline member function (7.1.2) 5041 NewFD->setImplicitlyInline(); 5042 } 5043 5044 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5045 !CurContext->isRecord()) { 5046 // C++ [class.static]p1: 5047 // A data or function member of a class may be declared static 5048 // in a class definition, in which case it is a static member of 5049 // the class. 5050 5051 // Complain about the 'static' specifier if it's on an out-of-line 5052 // member function definition. 5053 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5054 diag::err_static_out_of_line) 5055 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5056 } 5057 } 5058 5059 // Filter out previous declarations that don't match the scope. 5060 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5061 isExplicitSpecialization || 5062 isFunctionTemplateSpecialization); 5063 5064 // Handle GNU asm-label extension (encoded as an attribute). 5065 if (Expr *E = (Expr*) D.getAsmLabel()) { 5066 // The parser guarantees this is a string. 5067 StringLiteral *SE = cast<StringLiteral>(E); 5068 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5069 SE->getString())); 5070 } 5071 5072 // Copy the parameter declarations from the declarator D to the function 5073 // declaration NewFD, if they are available. First scavenge them into Params. 5074 SmallVector<ParmVarDecl*, 16> Params; 5075 if (D.isFunctionDeclarator()) { 5076 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5077 5078 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5079 // function that takes no arguments, not a function that takes a 5080 // single void argument. 5081 // We let through "const void" here because Sema::GetTypeForDeclarator 5082 // already checks for that case. 5083 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5084 FTI.ArgInfo[0].Param && 5085 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5086 // Empty arg list, don't push any params. 5087 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5088 5089 // In C++, the empty parameter-type-list must be spelled "void"; a 5090 // typedef of void is not permitted. 5091 if (getLangOptions().CPlusPlus && 5092 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5093 bool IsTypeAlias = false; 5094 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5095 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5096 else if (const TemplateSpecializationType *TST = 5097 Param->getType()->getAs<TemplateSpecializationType>()) 5098 IsTypeAlias = TST->isTypeAlias(); 5099 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5100 << IsTypeAlias; 5101 } 5102 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5103 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5104 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5105 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5106 Param->setDeclContext(NewFD); 5107 Params.push_back(Param); 5108 5109 if (Param->isInvalidDecl()) 5110 NewFD->setInvalidDecl(); 5111 } 5112 } 5113 5114 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5115 // When we're declaring a function with a typedef, typeof, etc as in the 5116 // following example, we'll need to synthesize (unnamed) 5117 // parameters for use in the declaration. 5118 // 5119 // @code 5120 // typedef void fn(int); 5121 // fn f; 5122 // @endcode 5123 5124 // Synthesize a parameter for each argument type. 5125 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5126 AE = FT->arg_type_end(); AI != AE; ++AI) { 5127 ParmVarDecl *Param = 5128 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5129 Param->setScopeInfo(0, Params.size()); 5130 Params.push_back(Param); 5131 } 5132 } else { 5133 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5134 "Should not need args for typedef of non-prototype fn"); 5135 } 5136 5137 // Finally, we know we have the right number of parameters, install them. 5138 NewFD->setParams(Params); 5139 5140 // Process the non-inheritable attributes on this declaration. 5141 ProcessDeclAttributes(S, NewFD, D, 5142 /*NonInheritable=*/true, /*Inheritable=*/false); 5143 5144 if (!getLangOptions().CPlusPlus) { 5145 // Perform semantic checking on the function declaration. 5146 bool isExplicitSpecialization=false; 5147 if (!NewFD->isInvalidDecl()) { 5148 if (NewFD->getResultType()->isVariablyModifiedType()) { 5149 // Functions returning a variably modified type violate C99 6.7.5.2p2 5150 // because all functions have linkage. 5151 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5152 NewFD->setInvalidDecl(); 5153 } else { 5154 if (NewFD->isMain()) 5155 CheckMain(NewFD, D.getDeclSpec()); 5156 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5157 isExplicitSpecialization)); 5158 } 5159 } 5160 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5161 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5162 "previous declaration set still overloaded"); 5163 } else { 5164 // If the declarator is a template-id, translate the parser's template 5165 // argument list into our AST format. 5166 bool HasExplicitTemplateArgs = false; 5167 TemplateArgumentListInfo TemplateArgs; 5168 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5169 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5170 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5171 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5172 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5173 TemplateId->getTemplateArgs(), 5174 TemplateId->NumArgs); 5175 translateTemplateArguments(TemplateArgsPtr, 5176 TemplateArgs); 5177 TemplateArgsPtr.release(); 5178 5179 HasExplicitTemplateArgs = true; 5180 5181 if (NewFD->isInvalidDecl()) { 5182 HasExplicitTemplateArgs = false; 5183 } else if (FunctionTemplate) { 5184 // Function template with explicit template arguments. 5185 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5186 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5187 5188 HasExplicitTemplateArgs = false; 5189 } else if (!isFunctionTemplateSpecialization && 5190 !D.getDeclSpec().isFriendSpecified()) { 5191 // We have encountered something that the user meant to be a 5192 // specialization (because it has explicitly-specified template 5193 // arguments) but that was not introduced with a "template<>" (or had 5194 // too few of them). 5195 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5196 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5197 << FixItHint::CreateInsertion( 5198 D.getDeclSpec().getSourceRange().getBegin(), 5199 "template<> "); 5200 isFunctionTemplateSpecialization = true; 5201 } else { 5202 // "friend void foo<>(int);" is an implicit specialization decl. 5203 isFunctionTemplateSpecialization = true; 5204 } 5205 } else if (isFriend && isFunctionTemplateSpecialization) { 5206 // This combination is only possible in a recovery case; the user 5207 // wrote something like: 5208 // template <> friend void foo(int); 5209 // which we're recovering from as if the user had written: 5210 // friend void foo<>(int); 5211 // Go ahead and fake up a template id. 5212 HasExplicitTemplateArgs = true; 5213 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5214 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5215 } 5216 5217 // If it's a friend (and only if it's a friend), it's possible 5218 // that either the specialized function type or the specialized 5219 // template is dependent, and therefore matching will fail. In 5220 // this case, don't check the specialization yet. 5221 bool InstantiationDependent = false; 5222 if (isFunctionTemplateSpecialization && isFriend && 5223 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5224 TemplateSpecializationType::anyDependentTemplateArguments( 5225 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5226 InstantiationDependent))) { 5227 assert(HasExplicitTemplateArgs && 5228 "friend function specialization without template args"); 5229 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5230 Previous)) 5231 NewFD->setInvalidDecl(); 5232 } else if (isFunctionTemplateSpecialization) { 5233 if (CurContext->isDependentContext() && CurContext->isRecord() 5234 && !isFriend) { 5235 isDependentClassScopeExplicitSpecialization = true; 5236 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5237 diag::ext_function_specialization_in_class : 5238 diag::err_function_specialization_in_class) 5239 << NewFD->getDeclName(); 5240 } else if (CheckFunctionTemplateSpecialization(NewFD, 5241 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5242 Previous)) 5243 NewFD->setInvalidDecl(); 5244 5245 // C++ [dcl.stc]p1: 5246 // A storage-class-specifier shall not be specified in an explicit 5247 // specialization (14.7.3) 5248 if (SC != SC_None) { 5249 if (SC != NewFD->getStorageClass()) 5250 Diag(NewFD->getLocation(), 5251 diag::err_explicit_specialization_inconsistent_storage_class) 5252 << SC 5253 << FixItHint::CreateRemoval( 5254 D.getDeclSpec().getStorageClassSpecLoc()); 5255 5256 else 5257 Diag(NewFD->getLocation(), 5258 diag::ext_explicit_specialization_storage_class) 5259 << FixItHint::CreateRemoval( 5260 D.getDeclSpec().getStorageClassSpecLoc()); 5261 } 5262 5263 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5264 if (CheckMemberSpecialization(NewFD, Previous)) 5265 NewFD->setInvalidDecl(); 5266 } 5267 5268 // Perform semantic checking on the function declaration. 5269 if (!isDependentClassScopeExplicitSpecialization) { 5270 if (NewFD->isInvalidDecl()) { 5271 // If this is a class member, mark the class invalid immediately. 5272 // This avoids some consistency errors later. 5273 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5274 methodDecl->getParent()->setInvalidDecl(); 5275 } else { 5276 if (NewFD->isMain()) 5277 CheckMain(NewFD, D.getDeclSpec()); 5278 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5279 isExplicitSpecialization)); 5280 } 5281 } 5282 5283 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5284 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5285 "previous declaration set still overloaded"); 5286 5287 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5288 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5289 NewFD->setInvalidDecl(); 5290 5291 NamedDecl *PrincipalDecl = (FunctionTemplate 5292 ? cast<NamedDecl>(FunctionTemplate) 5293 : NewFD); 5294 5295 if (isFriend && D.isRedeclaration()) { 5296 AccessSpecifier Access = AS_public; 5297 if (!NewFD->isInvalidDecl()) 5298 Access = NewFD->getPreviousDeclaration()->getAccess(); 5299 5300 NewFD->setAccess(Access); 5301 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5302 5303 PrincipalDecl->setObjectOfFriendDecl(true); 5304 } 5305 5306 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5307 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5308 PrincipalDecl->setNonMemberOperator(); 5309 5310 // If we have a function template, check the template parameter 5311 // list. This will check and merge default template arguments. 5312 if (FunctionTemplate) { 5313 FunctionTemplateDecl *PrevTemplate = 5314 FunctionTemplate->getPreviousDeclaration(); 5315 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5316 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5317 D.getDeclSpec().isFriendSpecified() 5318 ? (D.isFunctionDefinition() 5319 ? TPC_FriendFunctionTemplateDefinition 5320 : TPC_FriendFunctionTemplate) 5321 : (D.getCXXScopeSpec().isSet() && 5322 DC && DC->isRecord() && 5323 DC->isDependentContext()) 5324 ? TPC_ClassTemplateMember 5325 : TPC_FunctionTemplate); 5326 } 5327 5328 if (NewFD->isInvalidDecl()) { 5329 // Ignore all the rest of this. 5330 } else if (!D.isRedeclaration()) { 5331 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5332 AddToScope }; 5333 // Fake up an access specifier if it's supposed to be a class member. 5334 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5335 NewFD->setAccess(AS_public); 5336 5337 // Qualified decls generally require a previous declaration. 5338 if (D.getCXXScopeSpec().isSet()) { 5339 // ...with the major exception of templated-scope or 5340 // dependent-scope friend declarations. 5341 5342 // TODO: we currently also suppress this check in dependent 5343 // contexts because (1) the parameter depth will be off when 5344 // matching friend templates and (2) we might actually be 5345 // selecting a friend based on a dependent factor. But there 5346 // are situations where these conditions don't apply and we 5347 // can actually do this check immediately. 5348 if (isFriend && 5349 (TemplateParamLists.size() || 5350 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5351 CurContext->isDependentContext())) { 5352 // ignore these 5353 } else { 5354 // The user tried to provide an out-of-line definition for a 5355 // function that is a member of a class or namespace, but there 5356 // was no such member function declared (C++ [class.mfct]p2, 5357 // C++ [namespace.memdef]p2). For example: 5358 // 5359 // class X { 5360 // void f() const; 5361 // }; 5362 // 5363 // void X::f() { } // ill-formed 5364 // 5365 // Complain about this problem, and attempt to suggest close 5366 // matches (e.g., those that differ only in cv-qualifiers and 5367 // whether the parameter types are references). 5368 5369 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5370 NewFD, 5371 ExtraArgs)) { 5372 AddToScope = ExtraArgs.AddToScope; 5373 return Result; 5374 } 5375 } 5376 5377 // Unqualified local friend declarations are required to resolve 5378 // to something. 5379 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5380 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5381 NewFD, 5382 ExtraArgs)) { 5383 AddToScope = ExtraArgs.AddToScope; 5384 return Result; 5385 } 5386 } 5387 5388 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5389 !isFriend && !isFunctionTemplateSpecialization && 5390 !isExplicitSpecialization) { 5391 // An out-of-line member function declaration must also be a 5392 // definition (C++ [dcl.meaning]p1). 5393 // Note that this is not the case for explicit specializations of 5394 // function templates or member functions of class templates, per 5395 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5396 // extension for compatibility with old SWIG code which likes to 5397 // generate them. 5398 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5399 << D.getCXXScopeSpec().getRange(); 5400 } 5401 } 5402 5403 5404 // Handle attributes. We need to have merged decls when handling attributes 5405 // (for example to check for conflicts, etc). 5406 // FIXME: This needs to happen before we merge declarations. Then, 5407 // let attribute merging cope with attribute conflicts. 5408 ProcessDeclAttributes(S, NewFD, D, 5409 /*NonInheritable=*/false, /*Inheritable=*/true); 5410 5411 // attributes declared post-definition are currently ignored 5412 // FIXME: This should happen during attribute merging 5413 if (D.isRedeclaration() && Previous.isSingleResult()) { 5414 const FunctionDecl *Def; 5415 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5416 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5417 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5418 Diag(Def->getLocation(), diag::note_previous_definition); 5419 } 5420 } 5421 5422 AddKnownFunctionAttributes(NewFD); 5423 5424 if (NewFD->hasAttr<OverloadableAttr>() && 5425 !NewFD->getType()->getAs<FunctionProtoType>()) { 5426 Diag(NewFD->getLocation(), 5427 diag::err_attribute_overloadable_no_prototype) 5428 << NewFD; 5429 5430 // Turn this into a variadic function with no parameters. 5431 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5432 FunctionProtoType::ExtProtoInfo EPI; 5433 EPI.Variadic = true; 5434 EPI.ExtInfo = FT->getExtInfo(); 5435 5436 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5437 NewFD->setType(R); 5438 } 5439 5440 // If there's a #pragma GCC visibility in scope, and this isn't a class 5441 // member, set the visibility of this function. 5442 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5443 AddPushedVisibilityAttribute(NewFD); 5444 5445 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5446 // marking the function. 5447 AddCFAuditedAttribute(NewFD); 5448 5449 // If this is a locally-scoped extern C function, update the 5450 // map of such names. 5451 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5452 && !NewFD->isInvalidDecl()) 5453 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5454 5455 // Set this FunctionDecl's range up to the right paren. 5456 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5457 5458 if (getLangOptions().CPlusPlus) { 5459 if (FunctionTemplate) { 5460 if (NewFD->isInvalidDecl()) 5461 FunctionTemplate->setInvalidDecl(); 5462 return FunctionTemplate; 5463 } 5464 } 5465 5466 MarkUnusedFileScopedDecl(NewFD); 5467 5468 if (getLangOptions().CUDA) 5469 if (IdentifierInfo *II = NewFD->getIdentifier()) 5470 if (!NewFD->isInvalidDecl() && 5471 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5472 if (II->isStr("cudaConfigureCall")) { 5473 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5474 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5475 5476 Context.setcudaConfigureCallDecl(NewFD); 5477 } 5478 } 5479 5480 // Here we have an function template explicit specialization at class scope. 5481 // The actually specialization will be postponed to template instatiation 5482 // time via the ClassScopeFunctionSpecializationDecl node. 5483 if (isDependentClassScopeExplicitSpecialization) { 5484 ClassScopeFunctionSpecializationDecl *NewSpec = 5485 ClassScopeFunctionSpecializationDecl::Create( 5486 Context, CurContext, SourceLocation(), 5487 cast<CXXMethodDecl>(NewFD)); 5488 CurContext->addDecl(NewSpec); 5489 AddToScope = false; 5490 } 5491 5492 return NewFD; 5493} 5494 5495/// \brief Perform semantic checking of a new function declaration. 5496/// 5497/// Performs semantic analysis of the new function declaration 5498/// NewFD. This routine performs all semantic checking that does not 5499/// require the actual declarator involved in the declaration, and is 5500/// used both for the declaration of functions as they are parsed 5501/// (called via ActOnDeclarator) and for the declaration of functions 5502/// that have been instantiated via C++ template instantiation (called 5503/// via InstantiateDecl). 5504/// 5505/// \param IsExplicitSpecialiation whether this new function declaration is 5506/// an explicit specialization of the previous declaration. 5507/// 5508/// This sets NewFD->isInvalidDecl() to true if there was an error. 5509/// 5510/// Returns true if the function declaration is a redeclaration. 5511bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5512 LookupResult &Previous, 5513 bool IsExplicitSpecialization) { 5514 assert(!NewFD->getResultType()->isVariablyModifiedType() 5515 && "Variably modified return types are not handled here"); 5516 5517 // Check for a previous declaration of this name. 5518 if (Previous.empty() && NewFD->isExternC()) { 5519 // Since we did not find anything by this name and we're declaring 5520 // an extern "C" function, look for a non-visible extern "C" 5521 // declaration with the same name. 5522 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5523 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5524 if (Pos != LocallyScopedExternalDecls.end()) 5525 Previous.addDecl(Pos->second); 5526 } 5527 5528 bool Redeclaration = false; 5529 5530 // Merge or overload the declaration with an existing declaration of 5531 // the same name, if appropriate. 5532 if (!Previous.empty()) { 5533 // Determine whether NewFD is an overload of PrevDecl or 5534 // a declaration that requires merging. If it's an overload, 5535 // there's no more work to do here; we'll just add the new 5536 // function to the scope. 5537 5538 NamedDecl *OldDecl = 0; 5539 if (!AllowOverloadingOfFunction(Previous, Context)) { 5540 Redeclaration = true; 5541 OldDecl = Previous.getFoundDecl(); 5542 } else { 5543 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5544 /*NewIsUsingDecl*/ false)) { 5545 case Ovl_Match: 5546 Redeclaration = true; 5547 break; 5548 5549 case Ovl_NonFunction: 5550 Redeclaration = true; 5551 break; 5552 5553 case Ovl_Overload: 5554 Redeclaration = false; 5555 break; 5556 } 5557 5558 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5559 // If a function name is overloadable in C, then every function 5560 // with that name must be marked "overloadable". 5561 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5562 << Redeclaration << NewFD; 5563 NamedDecl *OverloadedDecl = 0; 5564 if (Redeclaration) 5565 OverloadedDecl = OldDecl; 5566 else if (!Previous.empty()) 5567 OverloadedDecl = Previous.getRepresentativeDecl(); 5568 if (OverloadedDecl) 5569 Diag(OverloadedDecl->getLocation(), 5570 diag::note_attribute_overloadable_prev_overload); 5571 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5572 Context)); 5573 } 5574 } 5575 5576 if (Redeclaration) { 5577 // NewFD and OldDecl represent declarations that need to be 5578 // merged. 5579 if (MergeFunctionDecl(NewFD, OldDecl)) { 5580 NewFD->setInvalidDecl(); 5581 return Redeclaration; 5582 } 5583 5584 Previous.clear(); 5585 Previous.addDecl(OldDecl); 5586 5587 if (FunctionTemplateDecl *OldTemplateDecl 5588 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5589 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5590 FunctionTemplateDecl *NewTemplateDecl 5591 = NewFD->getDescribedFunctionTemplate(); 5592 assert(NewTemplateDecl && "Template/non-template mismatch"); 5593 if (CXXMethodDecl *Method 5594 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5595 Method->setAccess(OldTemplateDecl->getAccess()); 5596 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5597 } 5598 5599 // If this is an explicit specialization of a member that is a function 5600 // template, mark it as a member specialization. 5601 if (IsExplicitSpecialization && 5602 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5603 NewTemplateDecl->setMemberSpecialization(); 5604 assert(OldTemplateDecl->isMemberSpecialization()); 5605 } 5606 5607 } else { 5608 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5609 NewFD->setAccess(OldDecl->getAccess()); 5610 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5611 } 5612 } 5613 } 5614 5615 // Semantic checking for this function declaration (in isolation). 5616 if (getLangOptions().CPlusPlus) { 5617 // C++-specific checks. 5618 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5619 CheckConstructor(Constructor); 5620 } else if (CXXDestructorDecl *Destructor = 5621 dyn_cast<CXXDestructorDecl>(NewFD)) { 5622 CXXRecordDecl *Record = Destructor->getParent(); 5623 QualType ClassType = Context.getTypeDeclType(Record); 5624 5625 // FIXME: Shouldn't we be able to perform this check even when the class 5626 // type is dependent? Both gcc and edg can handle that. 5627 if (!ClassType->isDependentType()) { 5628 DeclarationName Name 5629 = Context.DeclarationNames.getCXXDestructorName( 5630 Context.getCanonicalType(ClassType)); 5631 if (NewFD->getDeclName() != Name) { 5632 Diag(NewFD->getLocation(), diag::err_destructor_name); 5633 NewFD->setInvalidDecl(); 5634 return Redeclaration; 5635 } 5636 } 5637 } else if (CXXConversionDecl *Conversion 5638 = dyn_cast<CXXConversionDecl>(NewFD)) { 5639 ActOnConversionDeclarator(Conversion); 5640 } 5641 5642 // Find any virtual functions that this function overrides. 5643 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5644 if (!Method->isFunctionTemplateSpecialization() && 5645 !Method->getDescribedFunctionTemplate()) { 5646 if (AddOverriddenMethods(Method->getParent(), Method)) { 5647 // If the function was marked as "static", we have a problem. 5648 if (NewFD->getStorageClass() == SC_Static) { 5649 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5650 << NewFD->getDeclName(); 5651 for (CXXMethodDecl::method_iterator 5652 Overridden = Method->begin_overridden_methods(), 5653 OverriddenEnd = Method->end_overridden_methods(); 5654 Overridden != OverriddenEnd; 5655 ++Overridden) { 5656 Diag((*Overridden)->getLocation(), 5657 diag::note_overridden_virtual_function); 5658 } 5659 } 5660 } 5661 } 5662 } 5663 5664 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5665 if (NewFD->isOverloadedOperator() && 5666 CheckOverloadedOperatorDeclaration(NewFD)) { 5667 NewFD->setInvalidDecl(); 5668 return Redeclaration; 5669 } 5670 5671 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5672 if (NewFD->getLiteralIdentifier() && 5673 CheckLiteralOperatorDeclaration(NewFD)) { 5674 NewFD->setInvalidDecl(); 5675 return Redeclaration; 5676 } 5677 5678 // In C++, check default arguments now that we have merged decls. Unless 5679 // the lexical context is the class, because in this case this is done 5680 // during delayed parsing anyway. 5681 if (!CurContext->isRecord()) 5682 CheckCXXDefaultArguments(NewFD); 5683 5684 // If this function declares a builtin function, check the type of this 5685 // declaration against the expected type for the builtin. 5686 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5687 ASTContext::GetBuiltinTypeError Error; 5688 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5689 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5690 // The type of this function differs from the type of the builtin, 5691 // so forget about the builtin entirely. 5692 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5693 } 5694 } 5695 } 5696 return Redeclaration; 5697} 5698 5699void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5700 // C++ [basic.start.main]p3: A program that declares main to be inline 5701 // or static is ill-formed. 5702 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5703 // shall not appear in a declaration of main. 5704 // static main is not an error under C99, but we should warn about it. 5705 if (FD->getStorageClass() == SC_Static) 5706 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5707 ? diag::err_static_main : diag::warn_static_main) 5708 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5709 if (FD->isInlineSpecified()) 5710 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5711 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5712 5713 QualType T = FD->getType(); 5714 assert(T->isFunctionType() && "function decl is not of function type"); 5715 const FunctionType* FT = T->getAs<FunctionType>(); 5716 5717 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5718 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5719 FD->setInvalidDecl(true); 5720 } 5721 5722 // Treat protoless main() as nullary. 5723 if (isa<FunctionNoProtoType>(FT)) return; 5724 5725 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5726 unsigned nparams = FTP->getNumArgs(); 5727 assert(FD->getNumParams() == nparams); 5728 5729 bool HasExtraParameters = (nparams > 3); 5730 5731 // Darwin passes an undocumented fourth argument of type char**. If 5732 // other platforms start sprouting these, the logic below will start 5733 // getting shifty. 5734 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5735 HasExtraParameters = false; 5736 5737 if (HasExtraParameters) { 5738 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5739 FD->setInvalidDecl(true); 5740 nparams = 3; 5741 } 5742 5743 // FIXME: a lot of the following diagnostics would be improved 5744 // if we had some location information about types. 5745 5746 QualType CharPP = 5747 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5748 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5749 5750 for (unsigned i = 0; i < nparams; ++i) { 5751 QualType AT = FTP->getArgType(i); 5752 5753 bool mismatch = true; 5754 5755 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5756 mismatch = false; 5757 else if (Expected[i] == CharPP) { 5758 // As an extension, the following forms are okay: 5759 // char const ** 5760 // char const * const * 5761 // char * const * 5762 5763 QualifierCollector qs; 5764 const PointerType* PT; 5765 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5766 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5767 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5768 qs.removeConst(); 5769 mismatch = !qs.empty(); 5770 } 5771 } 5772 5773 if (mismatch) { 5774 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5775 // TODO: suggest replacing given type with expected type 5776 FD->setInvalidDecl(true); 5777 } 5778 } 5779 5780 if (nparams == 1 && !FD->isInvalidDecl()) { 5781 Diag(FD->getLocation(), diag::warn_main_one_arg); 5782 } 5783 5784 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5785 Diag(FD->getLocation(), diag::err_main_template_decl); 5786 FD->setInvalidDecl(); 5787 } 5788} 5789 5790bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5791 // FIXME: Need strict checking. In C89, we need to check for 5792 // any assignment, increment, decrement, function-calls, or 5793 // commas outside of a sizeof. In C99, it's the same list, 5794 // except that the aforementioned are allowed in unevaluated 5795 // expressions. Everything else falls under the 5796 // "may accept other forms of constant expressions" exception. 5797 // (We never end up here for C++, so the constant expression 5798 // rules there don't matter.) 5799 if (Init->isConstantInitializer(Context, false)) 5800 return false; 5801 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5802 << Init->getSourceRange(); 5803 return true; 5804} 5805 5806namespace { 5807 // Visits an initialization expression to see if OrigDecl is evaluated in 5808 // its own initialization and throws a warning if it does. 5809 class SelfReferenceChecker 5810 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5811 Sema &S; 5812 Decl *OrigDecl; 5813 bool isRecordType; 5814 bool isPODType; 5815 5816 public: 5817 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5818 5819 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5820 S(S), OrigDecl(OrigDecl) { 5821 isPODType = false; 5822 isRecordType = false; 5823 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5824 isPODType = VD->getType().isPODType(S.Context); 5825 isRecordType = VD->getType()->isRecordType(); 5826 } 5827 } 5828 5829 void VisitExpr(Expr *E) { 5830 if (isa<ObjCMessageExpr>(*E)) return; 5831 if (isRecordType) { 5832 Expr *expr = E; 5833 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5834 ValueDecl *VD = ME->getMemberDecl(); 5835 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5836 expr = ME->getBase(); 5837 } 5838 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5839 HandleDeclRefExpr(DRE); 5840 return; 5841 } 5842 } 5843 Inherited::VisitExpr(E); 5844 } 5845 5846 void VisitMemberExpr(MemberExpr *E) { 5847 if (E->getType()->canDecayToPointerType()) return; 5848 if (isa<FieldDecl>(E->getMemberDecl())) 5849 if (DeclRefExpr *DRE 5850 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5851 HandleDeclRefExpr(DRE); 5852 return; 5853 } 5854 Inherited::VisitMemberExpr(E); 5855 } 5856 5857 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5858 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5859 (isRecordType && E->getCastKind() == CK_NoOp)) { 5860 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5861 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5862 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5863 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5864 HandleDeclRefExpr(DRE); 5865 return; 5866 } 5867 } 5868 Inherited::VisitImplicitCastExpr(E); 5869 } 5870 5871 void VisitUnaryOperator(UnaryOperator *E) { 5872 // For POD record types, addresses of its own members are well-defined. 5873 if (isRecordType && isPODType) return; 5874 Inherited::VisitUnaryOperator(E); 5875 } 5876 5877 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5878 Decl* ReferenceDecl = DRE->getDecl(); 5879 if (OrigDecl != ReferenceDecl) return; 5880 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5881 Sema::NotForRedeclaration); 5882 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5883 S.PDiag(diag::warn_uninit_self_reference_in_init) 5884 << Result.getLookupName() 5885 << OrigDecl->getLocation() 5886 << DRE->getSourceRange()); 5887 } 5888 }; 5889} 5890 5891/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5892void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5893 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5894} 5895 5896/// AddInitializerToDecl - Adds the initializer Init to the 5897/// declaration dcl. If DirectInit is true, this is C++ direct 5898/// initialization rather than copy initialization. 5899void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5900 bool DirectInit, bool TypeMayContainAuto) { 5901 // If there is no declaration, there was an error parsing it. Just ignore 5902 // the initializer. 5903 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5904 return; 5905 5906 // Check for self-references within variable initializers. 5907 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5908 // Variables declared within a function/method body are handled 5909 // by a dataflow analysis. 5910 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5911 CheckSelfReference(RealDecl, Init); 5912 } 5913 else { 5914 CheckSelfReference(RealDecl, Init); 5915 } 5916 5917 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5918 // With declarators parsed the way they are, the parser cannot 5919 // distinguish between a normal initializer and a pure-specifier. 5920 // Thus this grotesque test. 5921 IntegerLiteral *IL; 5922 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5923 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5924 CheckPureMethod(Method, Init->getSourceRange()); 5925 else { 5926 Diag(Method->getLocation(), diag::err_member_function_initialization) 5927 << Method->getDeclName() << Init->getSourceRange(); 5928 Method->setInvalidDecl(); 5929 } 5930 return; 5931 } 5932 5933 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5934 if (!VDecl) { 5935 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5936 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5937 RealDecl->setInvalidDecl(); 5938 return; 5939 } 5940 5941 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5942 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5943 TypeSourceInfo *DeducedType = 0; 5944 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5945 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5946 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5947 << Init->getSourceRange(); 5948 if (!DeducedType) { 5949 RealDecl->setInvalidDecl(); 5950 return; 5951 } 5952 VDecl->setTypeSourceInfo(DeducedType); 5953 VDecl->setType(DeducedType->getType()); 5954 5955 // In ARC, infer lifetime. 5956 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5957 VDecl->setInvalidDecl(); 5958 5959 // If this is a redeclaration, check that the type we just deduced matches 5960 // the previously declared type. 5961 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5962 MergeVarDeclTypes(VDecl, Old); 5963 } 5964 5965 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 5966 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 5967 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5968 VDecl->setInvalidDecl(); 5969 return; 5970 } 5971 5972 5973 // A definition must end up with a complete type, which means it must be 5974 // complete with the restriction that an array type might be completed by the 5975 // initializer; note that later code assumes this restriction. 5976 QualType BaseDeclType = VDecl->getType(); 5977 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5978 BaseDeclType = Array->getElementType(); 5979 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5980 diag::err_typecheck_decl_incomplete_type)) { 5981 RealDecl->setInvalidDecl(); 5982 return; 5983 } 5984 5985 // The variable can not have an abstract class type. 5986 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5987 diag::err_abstract_type_in_decl, 5988 AbstractVariableType)) 5989 VDecl->setInvalidDecl(); 5990 5991 const VarDecl *Def; 5992 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5993 Diag(VDecl->getLocation(), diag::err_redefinition) 5994 << VDecl->getDeclName(); 5995 Diag(Def->getLocation(), diag::note_previous_definition); 5996 VDecl->setInvalidDecl(); 5997 return; 5998 } 5999 6000 const VarDecl* PrevInit = 0; 6001 if (getLangOptions().CPlusPlus) { 6002 // C++ [class.static.data]p4 6003 // If a static data member is of const integral or const 6004 // enumeration type, its declaration in the class definition can 6005 // specify a constant-initializer which shall be an integral 6006 // constant expression (5.19). In that case, the member can appear 6007 // in integral constant expressions. The member shall still be 6008 // defined in a namespace scope if it is used in the program and the 6009 // namespace scope definition shall not contain an initializer. 6010 // 6011 // We already performed a redefinition check above, but for static 6012 // data members we also need to check whether there was an in-class 6013 // declaration with an initializer. 6014 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6015 Diag(VDecl->getLocation(), diag::err_redefinition) 6016 << VDecl->getDeclName(); 6017 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6018 return; 6019 } 6020 6021 if (VDecl->hasLocalStorage()) 6022 getCurFunction()->setHasBranchProtectedScope(); 6023 6024 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6025 VDecl->setInvalidDecl(); 6026 return; 6027 } 6028 } 6029 6030 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6031 // a kernel function cannot be initialized." 6032 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6033 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6034 VDecl->setInvalidDecl(); 6035 return; 6036 } 6037 6038 // Get the decls type and save a reference for later, since 6039 // CheckInitializerTypes may change it. 6040 QualType DclT = VDecl->getType(), SavT = DclT; 6041 6042 // Perform the initialization. 6043 if (!VDecl->isInvalidDecl()) { 6044 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6045 InitializationKind Kind 6046 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6047 Init->getLocStart(), 6048 Init->getLocEnd()) 6049 : InitializationKind::CreateCopy(VDecl->getLocation(), 6050 Init->getLocStart()); 6051 6052 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6053 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6054 MultiExprArg(*this, &Init, 1), 6055 &DclT); 6056 if (Result.isInvalid()) { 6057 VDecl->setInvalidDecl(); 6058 return; 6059 } 6060 6061 Init = Result.takeAs<Expr>(); 6062 } 6063 6064 // If the type changed, it means we had an incomplete type that was 6065 // completed by the initializer. For example: 6066 // int ary[] = { 1, 3, 5 }; 6067 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6068 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6069 VDecl->setType(DclT); 6070 Init->setType(DclT.getNonReferenceType()); 6071 } 6072 6073 // Check any implicit conversions within the expression. 6074 CheckImplicitConversions(Init, VDecl->getLocation()); 6075 6076 if (!VDecl->isInvalidDecl()) 6077 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6078 6079 Init = MaybeCreateExprWithCleanups(Init); 6080 // Attach the initializer to the decl. 6081 VDecl->setInit(Init); 6082 6083 if (VDecl->isLocalVarDecl()) { 6084 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6085 // static storage duration shall be constant expressions or string literals. 6086 // C++ does not have this restriction. 6087 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6088 VDecl->getStorageClass() == SC_Static) 6089 CheckForConstantInitializer(Init, DclT); 6090 } else if (VDecl->isStaticDataMember() && 6091 VDecl->getLexicalDeclContext()->isRecord()) { 6092 // This is an in-class initialization for a static data member, e.g., 6093 // 6094 // struct S { 6095 // static const int value = 17; 6096 // }; 6097 6098 // C++ [class.mem]p4: 6099 // A member-declarator can contain a constant-initializer only 6100 // if it declares a static member (9.4) of const integral or 6101 // const enumeration type, see 9.4.2. 6102 // 6103 // C++11 [class.static.data]p3: 6104 // If a non-volatile const static data member is of integral or 6105 // enumeration type, its declaration in the class definition can 6106 // specify a brace-or-equal-initializer in which every initalizer-clause 6107 // that is an assignment-expression is a constant expression. A static 6108 // data member of literal type can be declared in the class definition 6109 // with the constexpr specifier; if so, its declaration shall specify a 6110 // brace-or-equal-initializer in which every initializer-clause that is 6111 // an assignment-expression is a constant expression. 6112 6113 // Do nothing on dependent types. 6114 if (DclT->isDependentType()) { 6115 6116 // Allow any 'static constexpr' members, whether or not they are of literal 6117 // type. We separately check that the initializer is a constant expression, 6118 // which implicitly requires the member to be of literal type. 6119 } else if (VDecl->isConstexpr()) { 6120 6121 // Require constness. 6122 } else if (!DclT.isConstQualified()) { 6123 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6124 << Init->getSourceRange(); 6125 VDecl->setInvalidDecl(); 6126 6127 // We allow integer constant expressions in all cases. 6128 } else if (DclT->isIntegralOrEnumerationType()) { 6129 // Check whether the expression is a constant expression. 6130 SourceLocation Loc; 6131 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6132 // In C++11, a non-constexpr const static data member with an 6133 // in-class initializer cannot be volatile. 6134 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6135 else if (Init->isValueDependent()) 6136 ; // Nothing to check. 6137 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6138 ; // Ok, it's an ICE! 6139 else if (Init->isEvaluatable(Context)) { 6140 // If we can constant fold the initializer through heroics, accept it, 6141 // but report this as a use of an extension for -pedantic. 6142 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6143 << Init->getSourceRange(); 6144 } else { 6145 // Otherwise, this is some crazy unknown case. Report the issue at the 6146 // location provided by the isIntegerConstantExpr failed check. 6147 Diag(Loc, diag::err_in_class_initializer_non_constant) 6148 << Init->getSourceRange(); 6149 VDecl->setInvalidDecl(); 6150 } 6151 6152 // We allow foldable floating-point constants as an extension. 6153 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6154 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6155 << DclT << Init->getSourceRange(); 6156 if (getLangOptions().CPlusPlus0x) 6157 Diag(VDecl->getLocation(), 6158 diag::note_in_class_initializer_float_type_constexpr) 6159 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6160 6161 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6162 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6163 << Init->getSourceRange(); 6164 VDecl->setInvalidDecl(); 6165 } 6166 6167 // Suggest adding 'constexpr' in C++11 for literal types. 6168 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6169 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6170 << DclT << Init->getSourceRange() 6171 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6172 VDecl->setConstexpr(true); 6173 6174 } else { 6175 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6176 << DclT << Init->getSourceRange(); 6177 VDecl->setInvalidDecl(); 6178 } 6179 } else if (VDecl->isFileVarDecl()) { 6180 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6181 (!getLangOptions().CPlusPlus || 6182 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6183 Diag(VDecl->getLocation(), diag::warn_extern_init); 6184 6185 // C99 6.7.8p4. All file scoped initializers need to be constant. 6186 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6187 CheckForConstantInitializer(Init, DclT); 6188 } 6189 6190 CheckCompleteVariableDeclaration(VDecl); 6191} 6192 6193/// ActOnInitializerError - Given that there was an error parsing an 6194/// initializer for the given declaration, try to return to some form 6195/// of sanity. 6196void Sema::ActOnInitializerError(Decl *D) { 6197 // Our main concern here is re-establishing invariants like "a 6198 // variable's type is either dependent or complete". 6199 if (!D || D->isInvalidDecl()) return; 6200 6201 VarDecl *VD = dyn_cast<VarDecl>(D); 6202 if (!VD) return; 6203 6204 // Auto types are meaningless if we can't make sense of the initializer. 6205 if (ParsingInitForAutoVars.count(D)) { 6206 D->setInvalidDecl(); 6207 return; 6208 } 6209 6210 QualType Ty = VD->getType(); 6211 if (Ty->isDependentType()) return; 6212 6213 // Require a complete type. 6214 if (RequireCompleteType(VD->getLocation(), 6215 Context.getBaseElementType(Ty), 6216 diag::err_typecheck_decl_incomplete_type)) { 6217 VD->setInvalidDecl(); 6218 return; 6219 } 6220 6221 // Require an abstract type. 6222 if (RequireNonAbstractType(VD->getLocation(), Ty, 6223 diag::err_abstract_type_in_decl, 6224 AbstractVariableType)) { 6225 VD->setInvalidDecl(); 6226 return; 6227 } 6228 6229 // Don't bother complaining about constructors or destructors, 6230 // though. 6231} 6232 6233void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6234 bool TypeMayContainAuto) { 6235 // If there is no declaration, there was an error parsing it. Just ignore it. 6236 if (RealDecl == 0) 6237 return; 6238 6239 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6240 QualType Type = Var->getType(); 6241 6242 // C++11 [dcl.spec.auto]p3 6243 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6244 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6245 << Var->getDeclName() << Type; 6246 Var->setInvalidDecl(); 6247 return; 6248 } 6249 6250 // C++11 [class.static.data]p3: A static data member can be declared with 6251 // the constexpr specifier; if so, its declaration shall specify 6252 // a brace-or-equal-initializer. 6253 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6254 // the definition of a variable [...] or the declaration of a static data 6255 // member. 6256 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6257 if (Var->isStaticDataMember()) 6258 Diag(Var->getLocation(), 6259 diag::err_constexpr_static_mem_var_requires_init) 6260 << Var->getDeclName(); 6261 else 6262 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6263 Var->setInvalidDecl(); 6264 return; 6265 } 6266 6267 switch (Var->isThisDeclarationADefinition()) { 6268 case VarDecl::Definition: 6269 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6270 break; 6271 6272 // We have an out-of-line definition of a static data member 6273 // that has an in-class initializer, so we type-check this like 6274 // a declaration. 6275 // 6276 // Fall through 6277 6278 case VarDecl::DeclarationOnly: 6279 // It's only a declaration. 6280 6281 // Block scope. C99 6.7p7: If an identifier for an object is 6282 // declared with no linkage (C99 6.2.2p6), the type for the 6283 // object shall be complete. 6284 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6285 !Var->getLinkage() && !Var->isInvalidDecl() && 6286 RequireCompleteType(Var->getLocation(), Type, 6287 diag::err_typecheck_decl_incomplete_type)) 6288 Var->setInvalidDecl(); 6289 6290 // Make sure that the type is not abstract. 6291 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6292 RequireNonAbstractType(Var->getLocation(), Type, 6293 diag::err_abstract_type_in_decl, 6294 AbstractVariableType)) 6295 Var->setInvalidDecl(); 6296 return; 6297 6298 case VarDecl::TentativeDefinition: 6299 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6300 // object that has file scope without an initializer, and without a 6301 // storage-class specifier or with the storage-class specifier "static", 6302 // constitutes a tentative definition. Note: A tentative definition with 6303 // external linkage is valid (C99 6.2.2p5). 6304 if (!Var->isInvalidDecl()) { 6305 if (const IncompleteArrayType *ArrayT 6306 = Context.getAsIncompleteArrayType(Type)) { 6307 if (RequireCompleteType(Var->getLocation(), 6308 ArrayT->getElementType(), 6309 diag::err_illegal_decl_array_incomplete_type)) 6310 Var->setInvalidDecl(); 6311 } else if (Var->getStorageClass() == SC_Static) { 6312 // C99 6.9.2p3: If the declaration of an identifier for an object is 6313 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6314 // declared type shall not be an incomplete type. 6315 // NOTE: code such as the following 6316 // static struct s; 6317 // struct s { int a; }; 6318 // is accepted by gcc. Hence here we issue a warning instead of 6319 // an error and we do not invalidate the static declaration. 6320 // NOTE: to avoid multiple warnings, only check the first declaration. 6321 if (Var->getPreviousDeclaration() == 0) 6322 RequireCompleteType(Var->getLocation(), Type, 6323 diag::ext_typecheck_decl_incomplete_type); 6324 } 6325 } 6326 6327 // Record the tentative definition; we're done. 6328 if (!Var->isInvalidDecl()) 6329 TentativeDefinitions.push_back(Var); 6330 return; 6331 } 6332 6333 // Provide a specific diagnostic for uninitialized variable 6334 // definitions with incomplete array type. 6335 if (Type->isIncompleteArrayType()) { 6336 Diag(Var->getLocation(), 6337 diag::err_typecheck_incomplete_array_needs_initializer); 6338 Var->setInvalidDecl(); 6339 return; 6340 } 6341 6342 // Provide a specific diagnostic for uninitialized variable 6343 // definitions with reference type. 6344 if (Type->isReferenceType()) { 6345 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6346 << Var->getDeclName() 6347 << SourceRange(Var->getLocation(), Var->getLocation()); 6348 Var->setInvalidDecl(); 6349 return; 6350 } 6351 6352 // Do not attempt to type-check the default initializer for a 6353 // variable with dependent type. 6354 if (Type->isDependentType()) 6355 return; 6356 6357 if (Var->isInvalidDecl()) 6358 return; 6359 6360 if (RequireCompleteType(Var->getLocation(), 6361 Context.getBaseElementType(Type), 6362 diag::err_typecheck_decl_incomplete_type)) { 6363 Var->setInvalidDecl(); 6364 return; 6365 } 6366 6367 // The variable can not have an abstract class type. 6368 if (RequireNonAbstractType(Var->getLocation(), Type, 6369 diag::err_abstract_type_in_decl, 6370 AbstractVariableType)) { 6371 Var->setInvalidDecl(); 6372 return; 6373 } 6374 6375 // Check for jumps past the implicit initializer. C++0x 6376 // clarifies that this applies to a "variable with automatic 6377 // storage duration", not a "local variable". 6378 // C++11 [stmt.dcl]p3 6379 // A program that jumps from a point where a variable with automatic 6380 // storage duration is not in scope to a point where it is in scope is 6381 // ill-formed unless the variable has scalar type, class type with a 6382 // trivial default constructor and a trivial destructor, a cv-qualified 6383 // version of one of these types, or an array of one of the preceding 6384 // types and is declared without an initializer. 6385 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6386 if (const RecordType *Record 6387 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6388 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6389 // Mark the function for further checking even if the looser rules of 6390 // C++11 do not require such checks, so that we can diagnose 6391 // incompatibilities with C++98. 6392 if (!CXXRecord->isPOD()) 6393 getCurFunction()->setHasBranchProtectedScope(); 6394 } 6395 } 6396 6397 // C++03 [dcl.init]p9: 6398 // If no initializer is specified for an object, and the 6399 // object is of (possibly cv-qualified) non-POD class type (or 6400 // array thereof), the object shall be default-initialized; if 6401 // the object is of const-qualified type, the underlying class 6402 // type shall have a user-declared default 6403 // constructor. Otherwise, if no initializer is specified for 6404 // a non- static object, the object and its subobjects, if 6405 // any, have an indeterminate initial value); if the object 6406 // or any of its subobjects are of const-qualified type, the 6407 // program is ill-formed. 6408 // C++0x [dcl.init]p11: 6409 // If no initializer is specified for an object, the object is 6410 // default-initialized; [...]. 6411 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6412 InitializationKind Kind 6413 = InitializationKind::CreateDefault(Var->getLocation()); 6414 6415 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6416 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6417 MultiExprArg(*this, 0, 0)); 6418 if (Init.isInvalid()) 6419 Var->setInvalidDecl(); 6420 else if (Init.get()) 6421 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6422 6423 CheckCompleteVariableDeclaration(Var); 6424 } 6425} 6426 6427void Sema::ActOnCXXForRangeDecl(Decl *D) { 6428 VarDecl *VD = dyn_cast<VarDecl>(D); 6429 if (!VD) { 6430 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6431 D->setInvalidDecl(); 6432 return; 6433 } 6434 6435 VD->setCXXForRangeDecl(true); 6436 6437 // for-range-declaration cannot be given a storage class specifier. 6438 int Error = -1; 6439 switch (VD->getStorageClassAsWritten()) { 6440 case SC_None: 6441 break; 6442 case SC_Extern: 6443 Error = 0; 6444 break; 6445 case SC_Static: 6446 Error = 1; 6447 break; 6448 case SC_PrivateExtern: 6449 Error = 2; 6450 break; 6451 case SC_Auto: 6452 Error = 3; 6453 break; 6454 case SC_Register: 6455 Error = 4; 6456 break; 6457 case SC_OpenCLWorkGroupLocal: 6458 llvm_unreachable("Unexpected storage class"); 6459 } 6460 if (VD->isConstexpr()) 6461 Error = 5; 6462 if (Error != -1) { 6463 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6464 << VD->getDeclName() << Error; 6465 D->setInvalidDecl(); 6466 } 6467} 6468 6469void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6470 if (var->isInvalidDecl()) return; 6471 6472 // In ARC, don't allow jumps past the implicit initialization of a 6473 // local retaining variable. 6474 if (getLangOptions().ObjCAutoRefCount && 6475 var->hasLocalStorage()) { 6476 switch (var->getType().getObjCLifetime()) { 6477 case Qualifiers::OCL_None: 6478 case Qualifiers::OCL_ExplicitNone: 6479 case Qualifiers::OCL_Autoreleasing: 6480 break; 6481 6482 case Qualifiers::OCL_Weak: 6483 case Qualifiers::OCL_Strong: 6484 getCurFunction()->setHasBranchProtectedScope(); 6485 break; 6486 } 6487 } 6488 6489 // All the following checks are C++ only. 6490 if (!getLangOptions().CPlusPlus) return; 6491 6492 QualType baseType = Context.getBaseElementType(var->getType()); 6493 if (baseType->isDependentType()) return; 6494 6495 // __block variables might require us to capture a copy-initializer. 6496 if (var->hasAttr<BlocksAttr>()) { 6497 // It's currently invalid to ever have a __block variable with an 6498 // array type; should we diagnose that here? 6499 6500 // Regardless, we don't want to ignore array nesting when 6501 // constructing this copy. 6502 QualType type = var->getType(); 6503 6504 if (type->isStructureOrClassType()) { 6505 SourceLocation poi = var->getLocation(); 6506 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6507 ExprResult result = 6508 PerformCopyInitialization( 6509 InitializedEntity::InitializeBlock(poi, type, false), 6510 poi, Owned(varRef)); 6511 if (!result.isInvalid()) { 6512 result = MaybeCreateExprWithCleanups(result); 6513 Expr *init = result.takeAs<Expr>(); 6514 Context.setBlockVarCopyInits(var, init); 6515 } 6516 } 6517 } 6518 6519 Expr *Init = var->getInit(); 6520 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6521 6522 if (!var->getDeclContext()->isDependentContext() && Init) { 6523 if (IsGlobal && !var->isConstexpr() && 6524 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6525 var->getLocation()) 6526 != DiagnosticsEngine::Ignored && 6527 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6528 Diag(var->getLocation(), diag::warn_global_constructor) 6529 << Init->getSourceRange(); 6530 6531 if (var->isConstexpr()) { 6532 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6533 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6534 SourceLocation DiagLoc = var->getLocation(); 6535 // If the note doesn't add any useful information other than a source 6536 // location, fold it into the primary diagnostic. 6537 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6538 diag::note_invalid_subexpr_in_const_expr) { 6539 DiagLoc = Notes[0].first; 6540 Notes.clear(); 6541 } 6542 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6543 << var << Init->getSourceRange(); 6544 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6545 Diag(Notes[I].first, Notes[I].second); 6546 } 6547 } else if (var->isUsableInConstantExpressions()) { 6548 // Check whether the initializer of a const variable of integral or 6549 // enumeration type is an ICE now, since we can't tell whether it was 6550 // initialized by a constant expression if we check later. 6551 var->checkInitIsICE(); 6552 } 6553 } 6554 6555 // Require the destructor. 6556 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6557 FinalizeVarWithDestructor(var, recordType); 6558} 6559 6560/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6561/// any semantic actions necessary after any initializer has been attached. 6562void 6563Sema::FinalizeDeclaration(Decl *ThisDecl) { 6564 // Note that we are no longer parsing the initializer for this declaration. 6565 ParsingInitForAutoVars.erase(ThisDecl); 6566} 6567 6568Sema::DeclGroupPtrTy 6569Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6570 Decl **Group, unsigned NumDecls) { 6571 SmallVector<Decl*, 8> Decls; 6572 6573 if (DS.isTypeSpecOwned()) 6574 Decls.push_back(DS.getRepAsDecl()); 6575 6576 for (unsigned i = 0; i != NumDecls; ++i) 6577 if (Decl *D = Group[i]) 6578 Decls.push_back(D); 6579 6580 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6581 DS.getTypeSpecType() == DeclSpec::TST_auto); 6582} 6583 6584/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6585/// group, performing any necessary semantic checking. 6586Sema::DeclGroupPtrTy 6587Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6588 bool TypeMayContainAuto) { 6589 // C++0x [dcl.spec.auto]p7: 6590 // If the type deduced for the template parameter U is not the same in each 6591 // deduction, the program is ill-formed. 6592 // FIXME: When initializer-list support is added, a distinction is needed 6593 // between the deduced type U and the deduced type which 'auto' stands for. 6594 // auto a = 0, b = { 1, 2, 3 }; 6595 // is legal because the deduced type U is 'int' in both cases. 6596 if (TypeMayContainAuto && NumDecls > 1) { 6597 QualType Deduced; 6598 CanQualType DeducedCanon; 6599 VarDecl *DeducedDecl = 0; 6600 for (unsigned i = 0; i != NumDecls; ++i) { 6601 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6602 AutoType *AT = D->getType()->getContainedAutoType(); 6603 // Don't reissue diagnostics when instantiating a template. 6604 if (AT && D->isInvalidDecl()) 6605 break; 6606 if (AT && AT->isDeduced()) { 6607 QualType U = AT->getDeducedType(); 6608 CanQualType UCanon = Context.getCanonicalType(U); 6609 if (Deduced.isNull()) { 6610 Deduced = U; 6611 DeducedCanon = UCanon; 6612 DeducedDecl = D; 6613 } else if (DeducedCanon != UCanon) { 6614 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6615 diag::err_auto_different_deductions) 6616 << Deduced << DeducedDecl->getDeclName() 6617 << U << D->getDeclName() 6618 << DeducedDecl->getInit()->getSourceRange() 6619 << D->getInit()->getSourceRange(); 6620 D->setInvalidDecl(); 6621 break; 6622 } 6623 } 6624 } 6625 } 6626 } 6627 6628 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6629} 6630 6631 6632/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6633/// to introduce parameters into function prototype scope. 6634Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6635 const DeclSpec &DS = D.getDeclSpec(); 6636 6637 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6638 // C++03 [dcl.stc]p2 also permits 'auto'. 6639 VarDecl::StorageClass StorageClass = SC_None; 6640 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6641 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6642 StorageClass = SC_Register; 6643 StorageClassAsWritten = SC_Register; 6644 } else if (getLangOptions().CPlusPlus && 6645 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6646 StorageClass = SC_Auto; 6647 StorageClassAsWritten = SC_Auto; 6648 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6649 Diag(DS.getStorageClassSpecLoc(), 6650 diag::err_invalid_storage_class_in_func_decl); 6651 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6652 } 6653 6654 if (D.getDeclSpec().isThreadSpecified()) 6655 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6656 if (D.getDeclSpec().isConstexprSpecified()) 6657 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6658 << 0; 6659 6660 DiagnoseFunctionSpecifiers(D); 6661 6662 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6663 QualType parmDeclType = TInfo->getType(); 6664 6665 if (getLangOptions().CPlusPlus) { 6666 // Check that there are no default arguments inside the type of this 6667 // parameter. 6668 CheckExtraCXXDefaultArguments(D); 6669 6670 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6671 if (D.getCXXScopeSpec().isSet()) { 6672 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6673 << D.getCXXScopeSpec().getRange(); 6674 D.getCXXScopeSpec().clear(); 6675 } 6676 } 6677 6678 // Ensure we have a valid name 6679 IdentifierInfo *II = 0; 6680 if (D.hasName()) { 6681 II = D.getIdentifier(); 6682 if (!II) { 6683 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6684 << GetNameForDeclarator(D).getName().getAsString(); 6685 D.setInvalidType(true); 6686 } 6687 } 6688 6689 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6690 if (II) { 6691 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6692 ForRedeclaration); 6693 LookupName(R, S); 6694 if (R.isSingleResult()) { 6695 NamedDecl *PrevDecl = R.getFoundDecl(); 6696 if (PrevDecl->isTemplateParameter()) { 6697 // Maybe we will complain about the shadowed template parameter. 6698 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6699 // Just pretend that we didn't see the previous declaration. 6700 PrevDecl = 0; 6701 } else if (S->isDeclScope(PrevDecl)) { 6702 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6703 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6704 6705 // Recover by removing the name 6706 II = 0; 6707 D.SetIdentifier(0, D.getIdentifierLoc()); 6708 D.setInvalidType(true); 6709 } 6710 } 6711 } 6712 6713 // Temporarily put parameter variables in the translation unit, not 6714 // the enclosing context. This prevents them from accidentally 6715 // looking like class members in C++. 6716 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6717 D.getSourceRange().getBegin(), 6718 D.getIdentifierLoc(), II, 6719 parmDeclType, TInfo, 6720 StorageClass, StorageClassAsWritten); 6721 6722 if (D.isInvalidType()) 6723 New->setInvalidDecl(); 6724 6725 assert(S->isFunctionPrototypeScope()); 6726 assert(S->getFunctionPrototypeDepth() >= 1); 6727 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6728 S->getNextFunctionPrototypeIndex()); 6729 6730 // Add the parameter declaration into this scope. 6731 S->AddDecl(New); 6732 if (II) 6733 IdResolver.AddDecl(New); 6734 6735 ProcessDeclAttributes(S, New, D); 6736 6737 if (D.getDeclSpec().isModulePrivateSpecified()) 6738 Diag(New->getLocation(), diag::err_module_private_local) 6739 << 1 << New->getDeclName() 6740 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6741 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6742 6743 if (New->hasAttr<BlocksAttr>()) { 6744 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6745 } 6746 return New; 6747} 6748 6749/// \brief Synthesizes a variable for a parameter arising from a 6750/// typedef. 6751ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6752 SourceLocation Loc, 6753 QualType T) { 6754 /* FIXME: setting StartLoc == Loc. 6755 Would it be worth to modify callers so as to provide proper source 6756 location for the unnamed parameters, embedding the parameter's type? */ 6757 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6758 T, Context.getTrivialTypeSourceInfo(T, Loc), 6759 SC_None, SC_None, 0); 6760 Param->setImplicit(); 6761 return Param; 6762} 6763 6764void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6765 ParmVarDecl * const *ParamEnd) { 6766 // Don't diagnose unused-parameter errors in template instantiations; we 6767 // will already have done so in the template itself. 6768 if (!ActiveTemplateInstantiations.empty()) 6769 return; 6770 6771 for (; Param != ParamEnd; ++Param) { 6772 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6773 !(*Param)->hasAttr<UnusedAttr>()) { 6774 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6775 << (*Param)->getDeclName(); 6776 } 6777 } 6778} 6779 6780void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6781 ParmVarDecl * const *ParamEnd, 6782 QualType ReturnTy, 6783 NamedDecl *D) { 6784 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6785 return; 6786 6787 // Warn if the return value is pass-by-value and larger than the specified 6788 // threshold. 6789 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6790 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6791 if (Size > LangOpts.NumLargeByValueCopy) 6792 Diag(D->getLocation(), diag::warn_return_value_size) 6793 << D->getDeclName() << Size; 6794 } 6795 6796 // Warn if any parameter is pass-by-value and larger than the specified 6797 // threshold. 6798 for (; Param != ParamEnd; ++Param) { 6799 QualType T = (*Param)->getType(); 6800 if (T->isDependentType() || !T.isPODType(Context)) 6801 continue; 6802 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6803 if (Size > LangOpts.NumLargeByValueCopy) 6804 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6805 << (*Param)->getDeclName() << Size; 6806 } 6807} 6808 6809ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6810 SourceLocation NameLoc, IdentifierInfo *Name, 6811 QualType T, TypeSourceInfo *TSInfo, 6812 VarDecl::StorageClass StorageClass, 6813 VarDecl::StorageClass StorageClassAsWritten) { 6814 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6815 if (getLangOptions().ObjCAutoRefCount && 6816 T.getObjCLifetime() == Qualifiers::OCL_None && 6817 T->isObjCLifetimeType()) { 6818 6819 Qualifiers::ObjCLifetime lifetime; 6820 6821 // Special cases for arrays: 6822 // - if it's const, use __unsafe_unretained 6823 // - otherwise, it's an error 6824 if (T->isArrayType()) { 6825 if (!T.isConstQualified()) { 6826 DelayedDiagnostics.add( 6827 sema::DelayedDiagnostic::makeForbiddenType( 6828 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6829 } 6830 lifetime = Qualifiers::OCL_ExplicitNone; 6831 } else { 6832 lifetime = T->getObjCARCImplicitLifetime(); 6833 } 6834 T = Context.getLifetimeQualifiedType(T, lifetime); 6835 } 6836 6837 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6838 Context.getAdjustedParameterType(T), 6839 TSInfo, 6840 StorageClass, StorageClassAsWritten, 6841 0); 6842 6843 // Parameters can not be abstract class types. 6844 // For record types, this is done by the AbstractClassUsageDiagnoser once 6845 // the class has been completely parsed. 6846 if (!CurContext->isRecord() && 6847 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6848 AbstractParamType)) 6849 New->setInvalidDecl(); 6850 6851 // Parameter declarators cannot be interface types. All ObjC objects are 6852 // passed by reference. 6853 if (T->isObjCObjectType()) { 6854 Diag(NameLoc, 6855 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6856 << FixItHint::CreateInsertion(NameLoc, "*"); 6857 T = Context.getObjCObjectPointerType(T); 6858 New->setType(T); 6859 } 6860 6861 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6862 // duration shall not be qualified by an address-space qualifier." 6863 // Since all parameters have automatic store duration, they can not have 6864 // an address space. 6865 if (T.getAddressSpace() != 0) { 6866 Diag(NameLoc, diag::err_arg_with_address_space); 6867 New->setInvalidDecl(); 6868 } 6869 6870 return New; 6871} 6872 6873void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6874 SourceLocation LocAfterDecls) { 6875 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6876 6877 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6878 // for a K&R function. 6879 if (!FTI.hasPrototype) { 6880 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6881 --i; 6882 if (FTI.ArgInfo[i].Param == 0) { 6883 llvm::SmallString<256> Code; 6884 llvm::raw_svector_ostream(Code) << " int " 6885 << FTI.ArgInfo[i].Ident->getName() 6886 << ";\n"; 6887 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6888 << FTI.ArgInfo[i].Ident 6889 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6890 6891 // Implicitly declare the argument as type 'int' for lack of a better 6892 // type. 6893 AttributeFactory attrs; 6894 DeclSpec DS(attrs); 6895 const char* PrevSpec; // unused 6896 unsigned DiagID; // unused 6897 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6898 PrevSpec, DiagID); 6899 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6900 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6901 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6902 } 6903 } 6904 } 6905} 6906 6907Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6908 Declarator &D) { 6909 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6910 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6911 Scope *ParentScope = FnBodyScope->getParent(); 6912 6913 D.setFunctionDefinitionKind(FDK_Definition); 6914 Decl *DP = HandleDeclarator(ParentScope, D, 6915 MultiTemplateParamsArg(*this)); 6916 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6917} 6918 6919static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6920 // Don't warn about invalid declarations. 6921 if (FD->isInvalidDecl()) 6922 return false; 6923 6924 // Or declarations that aren't global. 6925 if (!FD->isGlobal()) 6926 return false; 6927 6928 // Don't warn about C++ member functions. 6929 if (isa<CXXMethodDecl>(FD)) 6930 return false; 6931 6932 // Don't warn about 'main'. 6933 if (FD->isMain()) 6934 return false; 6935 6936 // Don't warn about inline functions. 6937 if (FD->isInlined()) 6938 return false; 6939 6940 // Don't warn about function templates. 6941 if (FD->getDescribedFunctionTemplate()) 6942 return false; 6943 6944 // Don't warn about function template specializations. 6945 if (FD->isFunctionTemplateSpecialization()) 6946 return false; 6947 6948 bool MissingPrototype = true; 6949 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6950 Prev; Prev = Prev->getPreviousDeclaration()) { 6951 // Ignore any declarations that occur in function or method 6952 // scope, because they aren't visible from the header. 6953 if (Prev->getDeclContext()->isFunctionOrMethod()) 6954 continue; 6955 6956 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6957 break; 6958 } 6959 6960 return MissingPrototype; 6961} 6962 6963void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6964 // Don't complain if we're in GNU89 mode and the previous definition 6965 // was an extern inline function. 6966 const FunctionDecl *Definition; 6967 if (FD->isDefined(Definition) && 6968 !canRedefineFunction(Definition, getLangOptions())) { 6969 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6970 Definition->getStorageClass() == SC_Extern) 6971 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6972 << FD->getDeclName() << getLangOptions().CPlusPlus; 6973 else 6974 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6975 Diag(Definition->getLocation(), diag::note_previous_definition); 6976 } 6977} 6978 6979Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6980 // Clear the last template instantiation error context. 6981 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6982 6983 if (!D) 6984 return D; 6985 FunctionDecl *FD = 0; 6986 6987 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6988 FD = FunTmpl->getTemplatedDecl(); 6989 else 6990 FD = cast<FunctionDecl>(D); 6991 6992 // Enter a new function scope 6993 PushFunctionScope(); 6994 6995 // See if this is a redefinition. 6996 if (!FD->isLateTemplateParsed()) 6997 CheckForFunctionRedefinition(FD); 6998 6999 // Builtin functions cannot be defined. 7000 if (unsigned BuiltinID = FD->getBuiltinID()) { 7001 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7002 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7003 FD->setInvalidDecl(); 7004 } 7005 } 7006 7007 // The return type of a function definition must be complete 7008 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7009 QualType ResultType = FD->getResultType(); 7010 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7011 !FD->isInvalidDecl() && 7012 RequireCompleteType(FD->getLocation(), ResultType, 7013 diag::err_func_def_incomplete_result)) 7014 FD->setInvalidDecl(); 7015 7016 // GNU warning -Wmissing-prototypes: 7017 // Warn if a global function is defined without a previous 7018 // prototype declaration. This warning is issued even if the 7019 // definition itself provides a prototype. The aim is to detect 7020 // global functions that fail to be declared in header files. 7021 if (ShouldWarnAboutMissingPrototype(FD)) 7022 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7023 7024 if (FnBodyScope) 7025 PushDeclContext(FnBodyScope, FD); 7026 7027 // Check the validity of our function parameters 7028 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7029 /*CheckParameterNames=*/true); 7030 7031 // Introduce our parameters into the function scope 7032 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7033 ParmVarDecl *Param = FD->getParamDecl(p); 7034 Param->setOwningFunction(FD); 7035 7036 // If this has an identifier, add it to the scope stack. 7037 if (Param->getIdentifier() && FnBodyScope) { 7038 CheckShadow(FnBodyScope, Param); 7039 7040 PushOnScopeChains(Param, FnBodyScope); 7041 } 7042 } 7043 7044 // Checking attributes of current function definition 7045 // dllimport attribute. 7046 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7047 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7048 // dllimport attribute cannot be directly applied to definition. 7049 // Microsoft accepts dllimport for functions defined within class scope. 7050 if (!DA->isInherited() && 7051 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7052 Diag(FD->getLocation(), 7053 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7054 << "dllimport"; 7055 FD->setInvalidDecl(); 7056 return FD; 7057 } 7058 7059 // Visual C++ appears to not think this is an issue, so only issue 7060 // a warning when Microsoft extensions are disabled. 7061 if (!LangOpts.MicrosoftExt) { 7062 // If a symbol previously declared dllimport is later defined, the 7063 // attribute is ignored in subsequent references, and a warning is 7064 // emitted. 7065 Diag(FD->getLocation(), 7066 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7067 << FD->getName() << "dllimport"; 7068 } 7069 } 7070 return FD; 7071} 7072 7073/// \brief Given the set of return statements within a function body, 7074/// compute the variables that are subject to the named return value 7075/// optimization. 7076/// 7077/// Each of the variables that is subject to the named return value 7078/// optimization will be marked as NRVO variables in the AST, and any 7079/// return statement that has a marked NRVO variable as its NRVO candidate can 7080/// use the named return value optimization. 7081/// 7082/// This function applies a very simplistic algorithm for NRVO: if every return 7083/// statement in the function has the same NRVO candidate, that candidate is 7084/// the NRVO variable. 7085/// 7086/// FIXME: Employ a smarter algorithm that accounts for multiple return 7087/// statements and the lifetimes of the NRVO candidates. We should be able to 7088/// find a maximal set of NRVO variables. 7089void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7090 ReturnStmt **Returns = Scope->Returns.data(); 7091 7092 const VarDecl *NRVOCandidate = 0; 7093 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7094 if (!Returns[I]->getNRVOCandidate()) 7095 return; 7096 7097 if (!NRVOCandidate) 7098 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7099 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7100 return; 7101 } 7102 7103 if (NRVOCandidate) 7104 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7105} 7106 7107Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7108 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7109} 7110 7111Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7112 bool IsInstantiation) { 7113 FunctionDecl *FD = 0; 7114 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7115 if (FunTmpl) 7116 FD = FunTmpl->getTemplatedDecl(); 7117 else 7118 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7119 7120 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7121 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7122 7123 if (FD) { 7124 FD->setBody(Body); 7125 if (FD->isMain()) { 7126 // C and C++ allow for main to automagically return 0. 7127 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7128 FD->setHasImplicitReturnZero(true); 7129 WP.disableCheckFallThrough(); 7130 } else if (FD->hasAttr<NakedAttr>()) { 7131 // If the function is marked 'naked', don't complain about missing return 7132 // statements. 7133 WP.disableCheckFallThrough(); 7134 } 7135 7136 // MSVC permits the use of pure specifier (=0) on function definition, 7137 // defined at class scope, warn about this non standard construct. 7138 if (getLangOptions().MicrosoftExt && FD->isPure()) 7139 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7140 7141 if (!FD->isInvalidDecl()) { 7142 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7143 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7144 FD->getResultType(), FD); 7145 7146 // If this is a constructor, we need a vtable. 7147 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7148 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7149 7150 computeNRVO(Body, getCurFunction()); 7151 } 7152 7153 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7154 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7155 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7156 MD->setBody(Body); 7157 if (Body) 7158 MD->setEndLoc(Body->getLocEnd()); 7159 if (!MD->isInvalidDecl()) { 7160 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7161 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7162 MD->getResultType(), MD); 7163 7164 if (Body) 7165 computeNRVO(Body, getCurFunction()); 7166 } 7167 if (ObjCShouldCallSuperDealloc) { 7168 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7169 ObjCShouldCallSuperDealloc = false; 7170 } 7171 if (ObjCShouldCallSuperFinalize) { 7172 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7173 ObjCShouldCallSuperFinalize = false; 7174 } 7175 } else { 7176 return 0; 7177 } 7178 7179 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7180 "ObjC methods, which should have been handled in the block above."); 7181 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7182 "ObjC methods, which should have been handled in the block above."); 7183 7184 // Verify and clean out per-function state. 7185 if (Body) { 7186 // C++ constructors that have function-try-blocks can't have return 7187 // statements in the handlers of that block. (C++ [except.handle]p14) 7188 // Verify this. 7189 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7190 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7191 7192 // Verify that gotos and switch cases don't jump into scopes illegally. 7193 if (getCurFunction()->NeedsScopeChecking() && 7194 !dcl->isInvalidDecl() && 7195 !hasAnyUnrecoverableErrorsInThisFunction()) 7196 DiagnoseInvalidJumps(Body); 7197 7198 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7199 if (!Destructor->getParent()->isDependentType()) 7200 CheckDestructor(Destructor); 7201 7202 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7203 Destructor->getParent()); 7204 } 7205 7206 // If any errors have occurred, clear out any temporaries that may have 7207 // been leftover. This ensures that these temporaries won't be picked up for 7208 // deletion in some later function. 7209 if (PP.getDiagnostics().hasErrorOccurred() || 7210 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7211 DiscardCleanupsInEvaluationContext(); 7212 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7213 // Since the body is valid, issue any analysis-based warnings that are 7214 // enabled. 7215 ActivePolicy = &WP; 7216 } 7217 7218 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7219 !CheckConstexprFunctionBody(FD, Body)) 7220 FD->setInvalidDecl(); 7221 7222 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7223 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7224 } 7225 7226 if (!IsInstantiation) 7227 PopDeclContext(); 7228 7229 PopFunctionScopeInfo(ActivePolicy, dcl); 7230 7231 // If any errors have occurred, clear out any temporaries that may have 7232 // been leftover. This ensures that these temporaries won't be picked up for 7233 // deletion in some later function. 7234 if (getDiagnostics().hasErrorOccurred()) { 7235 DiscardCleanupsInEvaluationContext(); 7236 } 7237 7238 return dcl; 7239} 7240 7241 7242/// When we finish delayed parsing of an attribute, we must attach it to the 7243/// relevant Decl. 7244void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7245 ParsedAttributes &Attrs) { 7246 ProcessDeclAttributeList(S, D, Attrs.getList()); 7247} 7248 7249 7250/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7251/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7252NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7253 IdentifierInfo &II, Scope *S) { 7254 // Before we produce a declaration for an implicitly defined 7255 // function, see whether there was a locally-scoped declaration of 7256 // this name as a function or variable. If so, use that 7257 // (non-visible) declaration, and complain about it. 7258 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7259 = findLocallyScopedExternalDecl(&II); 7260 if (Pos != LocallyScopedExternalDecls.end()) { 7261 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7262 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7263 return Pos->second; 7264 } 7265 7266 // Extension in C99. Legal in C90, but warn about it. 7267 unsigned diag_id; 7268 if (II.getName().startswith("__builtin_")) 7269 diag_id = diag::warn_builtin_unknown; 7270 else if (getLangOptions().C99) 7271 diag_id = diag::ext_implicit_function_decl; 7272 else 7273 diag_id = diag::warn_implicit_function_decl; 7274 Diag(Loc, diag_id) << &II; 7275 7276 // Because typo correction is expensive, only do it if the implicit 7277 // function declaration is going to be treated as an error. 7278 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7279 TypoCorrection Corrected; 7280 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7281 LookupOrdinaryName, S, 0))) { 7282 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7283 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7284 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7285 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7286 7287 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7288 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7289 7290 if (Func->getLocation().isValid() 7291 && !II.getName().startswith("__builtin_")) 7292 Diag(Func->getLocation(), diag::note_previous_decl) 7293 << CorrectedQuotedStr; 7294 } 7295 } 7296 } 7297 7298 // Set a Declarator for the implicit definition: int foo(); 7299 const char *Dummy; 7300 AttributeFactory attrFactory; 7301 DeclSpec DS(attrFactory); 7302 unsigned DiagID; 7303 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7304 (void)Error; // Silence warning. 7305 assert(!Error && "Error setting up implicit decl!"); 7306 Declarator D(DS, Declarator::BlockContext); 7307 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7308 0, 0, true, SourceLocation(), 7309 SourceLocation(), SourceLocation(), 7310 SourceLocation(), 7311 EST_None, SourceLocation(), 7312 0, 0, 0, 0, Loc, Loc, D), 7313 DS.getAttributes(), 7314 SourceLocation()); 7315 D.SetIdentifier(&II, Loc); 7316 7317 // Insert this function into translation-unit scope. 7318 7319 DeclContext *PrevDC = CurContext; 7320 CurContext = Context.getTranslationUnitDecl(); 7321 7322 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7323 FD->setImplicit(); 7324 7325 CurContext = PrevDC; 7326 7327 AddKnownFunctionAttributes(FD); 7328 7329 return FD; 7330} 7331 7332/// \brief Adds any function attributes that we know a priori based on 7333/// the declaration of this function. 7334/// 7335/// These attributes can apply both to implicitly-declared builtins 7336/// (like __builtin___printf_chk) or to library-declared functions 7337/// like NSLog or printf. 7338/// 7339/// We need to check for duplicate attributes both here and where user-written 7340/// attributes are applied to declarations. 7341void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7342 if (FD->isInvalidDecl()) 7343 return; 7344 7345 // If this is a built-in function, map its builtin attributes to 7346 // actual attributes. 7347 if (unsigned BuiltinID = FD->getBuiltinID()) { 7348 // Handle printf-formatting attributes. 7349 unsigned FormatIdx; 7350 bool HasVAListArg; 7351 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7352 if (!FD->getAttr<FormatAttr>()) 7353 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7354 "printf", FormatIdx+1, 7355 HasVAListArg ? 0 : FormatIdx+2)); 7356 } 7357 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7358 HasVAListArg)) { 7359 if (!FD->getAttr<FormatAttr>()) 7360 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7361 "scanf", FormatIdx+1, 7362 HasVAListArg ? 0 : FormatIdx+2)); 7363 } 7364 7365 // Mark const if we don't care about errno and that is the only 7366 // thing preventing the function from being const. This allows 7367 // IRgen to use LLVM intrinsics for such functions. 7368 if (!getLangOptions().MathErrno && 7369 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7370 if (!FD->getAttr<ConstAttr>()) 7371 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7372 } 7373 7374 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7375 !FD->getAttr<ReturnsTwiceAttr>()) 7376 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7377 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7378 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7379 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7380 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7381 } 7382 7383 IdentifierInfo *Name = FD->getIdentifier(); 7384 if (!Name) 7385 return; 7386 if ((!getLangOptions().CPlusPlus && 7387 FD->getDeclContext()->isTranslationUnit()) || 7388 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7389 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7390 LinkageSpecDecl::lang_c)) { 7391 // Okay: this could be a libc/libm/Objective-C function we know 7392 // about. 7393 } else 7394 return; 7395 7396 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7397 // FIXME: NSLog and NSLogv should be target specific 7398 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7399 // FIXME: We known better than our headers. 7400 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7401 } else 7402 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7403 "printf", 1, 7404 Name->isStr("NSLogv") ? 0 : 2)); 7405 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7406 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7407 // target-specific builtins, perhaps? 7408 if (!FD->getAttr<FormatAttr>()) 7409 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7410 "printf", 2, 7411 Name->isStr("vasprintf") ? 0 : 3)); 7412 } 7413} 7414 7415TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7416 TypeSourceInfo *TInfo) { 7417 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7418 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7419 7420 if (!TInfo) { 7421 assert(D.isInvalidType() && "no declarator info for valid type"); 7422 TInfo = Context.getTrivialTypeSourceInfo(T); 7423 } 7424 7425 // Scope manipulation handled by caller. 7426 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7427 D.getSourceRange().getBegin(), 7428 D.getIdentifierLoc(), 7429 D.getIdentifier(), 7430 TInfo); 7431 7432 // Bail out immediately if we have an invalid declaration. 7433 if (D.isInvalidType()) { 7434 NewTD->setInvalidDecl(); 7435 return NewTD; 7436 } 7437 7438 if (D.getDeclSpec().isModulePrivateSpecified()) { 7439 if (CurContext->isFunctionOrMethod()) 7440 Diag(NewTD->getLocation(), diag::err_module_private_local) 7441 << 2 << NewTD->getDeclName() 7442 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7443 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7444 else 7445 NewTD->setModulePrivate(); 7446 } 7447 7448 // C++ [dcl.typedef]p8: 7449 // If the typedef declaration defines an unnamed class (or 7450 // enum), the first typedef-name declared by the declaration 7451 // to be that class type (or enum type) is used to denote the 7452 // class type (or enum type) for linkage purposes only. 7453 // We need to check whether the type was declared in the declaration. 7454 switch (D.getDeclSpec().getTypeSpecType()) { 7455 case TST_enum: 7456 case TST_struct: 7457 case TST_union: 7458 case TST_class: { 7459 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7460 7461 // Do nothing if the tag is not anonymous or already has an 7462 // associated typedef (from an earlier typedef in this decl group). 7463 if (tagFromDeclSpec->getIdentifier()) break; 7464 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7465 7466 // A well-formed anonymous tag must always be a TUK_Definition. 7467 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7468 7469 // The type must match the tag exactly; no qualifiers allowed. 7470 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7471 break; 7472 7473 // Otherwise, set this is the anon-decl typedef for the tag. 7474 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7475 break; 7476 } 7477 7478 default: 7479 break; 7480 } 7481 7482 return NewTD; 7483} 7484 7485 7486/// \brief Determine whether a tag with a given kind is acceptable 7487/// as a redeclaration of the given tag declaration. 7488/// 7489/// \returns true if the new tag kind is acceptable, false otherwise. 7490bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7491 TagTypeKind NewTag, bool isDefinition, 7492 SourceLocation NewTagLoc, 7493 const IdentifierInfo &Name) { 7494 // C++ [dcl.type.elab]p3: 7495 // The class-key or enum keyword present in the 7496 // elaborated-type-specifier shall agree in kind with the 7497 // declaration to which the name in the elaborated-type-specifier 7498 // refers. This rule also applies to the form of 7499 // elaborated-type-specifier that declares a class-name or 7500 // friend class since it can be construed as referring to the 7501 // definition of the class. Thus, in any 7502 // elaborated-type-specifier, the enum keyword shall be used to 7503 // refer to an enumeration (7.2), the union class-key shall be 7504 // used to refer to a union (clause 9), and either the class or 7505 // struct class-key shall be used to refer to a class (clause 9) 7506 // declared using the class or struct class-key. 7507 TagTypeKind OldTag = Previous->getTagKind(); 7508 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7509 if (OldTag == NewTag) 7510 return true; 7511 7512 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7513 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7514 // Warn about the struct/class tag mismatch. 7515 bool isTemplate = false; 7516 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7517 isTemplate = Record->getDescribedClassTemplate(); 7518 7519 if (!ActiveTemplateInstantiations.empty()) { 7520 // In a template instantiation, do not offer fix-its for tag mismatches 7521 // since they usually mess up the template instead of fixing the problem. 7522 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7523 << (NewTag == TTK_Class) << isTemplate << &Name; 7524 return true; 7525 } 7526 7527 if (isDefinition) { 7528 // On definitions, check previous tags and issue a fix-it for each 7529 // one that doesn't match the current tag. 7530 if (Previous->getDefinition()) { 7531 // Don't suggest fix-its for redefinitions. 7532 return true; 7533 } 7534 7535 bool previousMismatch = false; 7536 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7537 E(Previous->redecls_end()); I != E; ++I) { 7538 if (I->getTagKind() != NewTag) { 7539 if (!previousMismatch) { 7540 previousMismatch = true; 7541 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7542 << (NewTag == TTK_Class) << isTemplate << &Name; 7543 } 7544 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7545 << (NewTag == TTK_Class) 7546 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7547 NewTag == TTK_Class? 7548 "class" : "struct"); 7549 } 7550 } 7551 return true; 7552 } 7553 7554 // Check for a previous definition. If current tag and definition 7555 // are same type, do nothing. If no definition, but disagree with 7556 // with previous tag type, give a warning, but no fix-it. 7557 const TagDecl *Redecl = Previous->getDefinition() ? 7558 Previous->getDefinition() : Previous; 7559 if (Redecl->getTagKind() == NewTag) { 7560 return true; 7561 } 7562 7563 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7564 << (NewTag == TTK_Class) 7565 << isTemplate << &Name; 7566 Diag(Redecl->getLocation(), diag::note_previous_use); 7567 7568 // If there is a previous defintion, suggest a fix-it. 7569 if (Previous->getDefinition()) { 7570 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7571 << (Redecl->getTagKind() == TTK_Class) 7572 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7573 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7574 } 7575 7576 return true; 7577 } 7578 return false; 7579} 7580 7581/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7582/// former case, Name will be non-null. In the later case, Name will be null. 7583/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7584/// reference/declaration/definition of a tag. 7585Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7586 SourceLocation KWLoc, CXXScopeSpec &SS, 7587 IdentifierInfo *Name, SourceLocation NameLoc, 7588 AttributeList *Attr, AccessSpecifier AS, 7589 SourceLocation ModulePrivateLoc, 7590 MultiTemplateParamsArg TemplateParameterLists, 7591 bool &OwnedDecl, bool &IsDependent, 7592 SourceLocation ScopedEnumKWLoc, 7593 bool ScopedEnumUsesClassTag, 7594 TypeResult UnderlyingType) { 7595 // If this is not a definition, it must have a name. 7596 assert((Name != 0 || TUK == TUK_Definition) && 7597 "Nameless record must be a definition!"); 7598 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7599 7600 OwnedDecl = false; 7601 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7602 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7603 7604 // FIXME: Check explicit specializations more carefully. 7605 bool isExplicitSpecialization = false; 7606 bool Invalid = false; 7607 7608 // We only need to do this matching if we have template parameters 7609 // or a scope specifier, which also conveniently avoids this work 7610 // for non-C++ cases. 7611 if (TemplateParameterLists.size() > 0 || 7612 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7613 if (TemplateParameterList *TemplateParams 7614 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7615 TemplateParameterLists.get(), 7616 TemplateParameterLists.size(), 7617 TUK == TUK_Friend, 7618 isExplicitSpecialization, 7619 Invalid)) { 7620 if (TemplateParams->size() > 0) { 7621 // This is a declaration or definition of a class template (which may 7622 // be a member of another template). 7623 7624 if (Invalid) 7625 return 0; 7626 7627 OwnedDecl = false; 7628 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7629 SS, Name, NameLoc, Attr, 7630 TemplateParams, AS, 7631 ModulePrivateLoc, 7632 TemplateParameterLists.size() - 1, 7633 (TemplateParameterList**) TemplateParameterLists.release()); 7634 return Result.get(); 7635 } else { 7636 // The "template<>" header is extraneous. 7637 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7638 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7639 isExplicitSpecialization = true; 7640 } 7641 } 7642 } 7643 7644 // Figure out the underlying type if this a enum declaration. We need to do 7645 // this early, because it's needed to detect if this is an incompatible 7646 // redeclaration. 7647 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7648 7649 if (Kind == TTK_Enum) { 7650 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7651 // No underlying type explicitly specified, or we failed to parse the 7652 // type, default to int. 7653 EnumUnderlying = Context.IntTy.getTypePtr(); 7654 else if (UnderlyingType.get()) { 7655 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7656 // integral type; any cv-qualification is ignored. 7657 TypeSourceInfo *TI = 0; 7658 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7659 EnumUnderlying = TI; 7660 7661 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7662 7663 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7664 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7665 << T; 7666 // Recover by falling back to int. 7667 EnumUnderlying = Context.IntTy.getTypePtr(); 7668 } 7669 7670 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7671 UPPC_FixedUnderlyingType)) 7672 EnumUnderlying = Context.IntTy.getTypePtr(); 7673 7674 } else if (getLangOptions().MicrosoftExt) 7675 // Microsoft enums are always of int type. 7676 EnumUnderlying = Context.IntTy.getTypePtr(); 7677 } 7678 7679 DeclContext *SearchDC = CurContext; 7680 DeclContext *DC = CurContext; 7681 bool isStdBadAlloc = false; 7682 7683 RedeclarationKind Redecl = ForRedeclaration; 7684 if (TUK == TUK_Friend || TUK == TUK_Reference) 7685 Redecl = NotForRedeclaration; 7686 7687 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7688 7689 if (Name && SS.isNotEmpty()) { 7690 // We have a nested-name tag ('struct foo::bar'). 7691 7692 // Check for invalid 'foo::'. 7693 if (SS.isInvalid()) { 7694 Name = 0; 7695 goto CreateNewDecl; 7696 } 7697 7698 // If this is a friend or a reference to a class in a dependent 7699 // context, don't try to make a decl for it. 7700 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7701 DC = computeDeclContext(SS, false); 7702 if (!DC) { 7703 IsDependent = true; 7704 return 0; 7705 } 7706 } else { 7707 DC = computeDeclContext(SS, true); 7708 if (!DC) { 7709 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7710 << SS.getRange(); 7711 return 0; 7712 } 7713 } 7714 7715 if (RequireCompleteDeclContext(SS, DC)) 7716 return 0; 7717 7718 SearchDC = DC; 7719 // Look-up name inside 'foo::'. 7720 LookupQualifiedName(Previous, DC); 7721 7722 if (Previous.isAmbiguous()) 7723 return 0; 7724 7725 if (Previous.empty()) { 7726 // Name lookup did not find anything. However, if the 7727 // nested-name-specifier refers to the current instantiation, 7728 // and that current instantiation has any dependent base 7729 // classes, we might find something at instantiation time: treat 7730 // this as a dependent elaborated-type-specifier. 7731 // But this only makes any sense for reference-like lookups. 7732 if (Previous.wasNotFoundInCurrentInstantiation() && 7733 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7734 IsDependent = true; 7735 return 0; 7736 } 7737 7738 // A tag 'foo::bar' must already exist. 7739 Diag(NameLoc, diag::err_not_tag_in_scope) 7740 << Kind << Name << DC << SS.getRange(); 7741 Name = 0; 7742 Invalid = true; 7743 goto CreateNewDecl; 7744 } 7745 } else if (Name) { 7746 // If this is a named struct, check to see if there was a previous forward 7747 // declaration or definition. 7748 // FIXME: We're looking into outer scopes here, even when we 7749 // shouldn't be. Doing so can result in ambiguities that we 7750 // shouldn't be diagnosing. 7751 LookupName(Previous, S); 7752 7753 if (Previous.isAmbiguous() && 7754 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7755 LookupResult::Filter F = Previous.makeFilter(); 7756 while (F.hasNext()) { 7757 NamedDecl *ND = F.next(); 7758 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7759 F.erase(); 7760 } 7761 F.done(); 7762 } 7763 7764 // Note: there used to be some attempt at recovery here. 7765 if (Previous.isAmbiguous()) 7766 return 0; 7767 7768 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7769 // FIXME: This makes sure that we ignore the contexts associated 7770 // with C structs, unions, and enums when looking for a matching 7771 // tag declaration or definition. See the similar lookup tweak 7772 // in Sema::LookupName; is there a better way to deal with this? 7773 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7774 SearchDC = SearchDC->getParent(); 7775 } 7776 } else if (S->isFunctionPrototypeScope()) { 7777 // If this is an enum declaration in function prototype scope, set its 7778 // initial context to the translation unit. 7779 SearchDC = Context.getTranslationUnitDecl(); 7780 } 7781 7782 if (Previous.isSingleResult() && 7783 Previous.getFoundDecl()->isTemplateParameter()) { 7784 // Maybe we will complain about the shadowed template parameter. 7785 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7786 // Just pretend that we didn't see the previous declaration. 7787 Previous.clear(); 7788 } 7789 7790 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7791 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7792 // This is a declaration of or a reference to "std::bad_alloc". 7793 isStdBadAlloc = true; 7794 7795 if (Previous.empty() && StdBadAlloc) { 7796 // std::bad_alloc has been implicitly declared (but made invisible to 7797 // name lookup). Fill in this implicit declaration as the previous 7798 // declaration, so that the declarations get chained appropriately. 7799 Previous.addDecl(getStdBadAlloc()); 7800 } 7801 } 7802 7803 // If we didn't find a previous declaration, and this is a reference 7804 // (or friend reference), move to the correct scope. In C++, we 7805 // also need to do a redeclaration lookup there, just in case 7806 // there's a shadow friend decl. 7807 if (Name && Previous.empty() && 7808 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7809 if (Invalid) goto CreateNewDecl; 7810 assert(SS.isEmpty()); 7811 7812 if (TUK == TUK_Reference) { 7813 // C++ [basic.scope.pdecl]p5: 7814 // -- for an elaborated-type-specifier of the form 7815 // 7816 // class-key identifier 7817 // 7818 // if the elaborated-type-specifier is used in the 7819 // decl-specifier-seq or parameter-declaration-clause of a 7820 // function defined in namespace scope, the identifier is 7821 // declared as a class-name in the namespace that contains 7822 // the declaration; otherwise, except as a friend 7823 // declaration, the identifier is declared in the smallest 7824 // non-class, non-function-prototype scope that contains the 7825 // declaration. 7826 // 7827 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7828 // C structs and unions. 7829 // 7830 // It is an error in C++ to declare (rather than define) an enum 7831 // type, including via an elaborated type specifier. We'll 7832 // diagnose that later; for now, declare the enum in the same 7833 // scope as we would have picked for any other tag type. 7834 // 7835 // GNU C also supports this behavior as part of its incomplete 7836 // enum types extension, while GNU C++ does not. 7837 // 7838 // Find the context where we'll be declaring the tag. 7839 // FIXME: We would like to maintain the current DeclContext as the 7840 // lexical context, 7841 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7842 SearchDC = SearchDC->getParent(); 7843 7844 // Find the scope where we'll be declaring the tag. 7845 while (S->isClassScope() || 7846 (getLangOptions().CPlusPlus && 7847 S->isFunctionPrototypeScope()) || 7848 ((S->getFlags() & Scope::DeclScope) == 0) || 7849 (S->getEntity() && 7850 ((DeclContext *)S->getEntity())->isTransparentContext())) 7851 S = S->getParent(); 7852 } else { 7853 assert(TUK == TUK_Friend); 7854 // C++ [namespace.memdef]p3: 7855 // If a friend declaration in a non-local class first declares a 7856 // class or function, the friend class or function is a member of 7857 // the innermost enclosing namespace. 7858 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7859 } 7860 7861 // In C++, we need to do a redeclaration lookup to properly 7862 // diagnose some problems. 7863 if (getLangOptions().CPlusPlus) { 7864 Previous.setRedeclarationKind(ForRedeclaration); 7865 LookupQualifiedName(Previous, SearchDC); 7866 } 7867 } 7868 7869 if (!Previous.empty()) { 7870 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7871 7872 // It's okay to have a tag decl in the same scope as a typedef 7873 // which hides a tag decl in the same scope. Finding this 7874 // insanity with a redeclaration lookup can only actually happen 7875 // in C++. 7876 // 7877 // This is also okay for elaborated-type-specifiers, which is 7878 // technically forbidden by the current standard but which is 7879 // okay according to the likely resolution of an open issue; 7880 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7881 if (getLangOptions().CPlusPlus) { 7882 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7883 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7884 TagDecl *Tag = TT->getDecl(); 7885 if (Tag->getDeclName() == Name && 7886 Tag->getDeclContext()->getRedeclContext() 7887 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7888 PrevDecl = Tag; 7889 Previous.clear(); 7890 Previous.addDecl(Tag); 7891 Previous.resolveKind(); 7892 } 7893 } 7894 } 7895 } 7896 7897 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7898 // If this is a use of a previous tag, or if the tag is already declared 7899 // in the same scope (so that the definition/declaration completes or 7900 // rementions the tag), reuse the decl. 7901 if (TUK == TUK_Reference || TUK == TUK_Friend || 7902 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7903 // Make sure that this wasn't declared as an enum and now used as a 7904 // struct or something similar. 7905 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7906 TUK == TUK_Definition, KWLoc, 7907 *Name)) { 7908 bool SafeToContinue 7909 = (PrevTagDecl->getTagKind() != TTK_Enum && 7910 Kind != TTK_Enum); 7911 if (SafeToContinue) 7912 Diag(KWLoc, diag::err_use_with_wrong_tag) 7913 << Name 7914 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7915 PrevTagDecl->getKindName()); 7916 else 7917 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7918 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7919 7920 if (SafeToContinue) 7921 Kind = PrevTagDecl->getTagKind(); 7922 else { 7923 // Recover by making this an anonymous redefinition. 7924 Name = 0; 7925 Previous.clear(); 7926 Invalid = true; 7927 } 7928 } 7929 7930 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7931 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7932 7933 // If this is an elaborated-type-specifier for a scoped enumeration, 7934 // the 'class' keyword is not necessary and not permitted. 7935 if (TUK == TUK_Reference || TUK == TUK_Friend) { 7936 if (ScopedEnum) 7937 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 7938 << PrevEnum->isScoped() 7939 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 7940 return PrevTagDecl; 7941 } 7942 7943 // All conflicts with previous declarations are recovered by 7944 // returning the previous declaration. 7945 if (ScopedEnum != PrevEnum->isScoped()) { 7946 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7947 << PrevEnum->isScoped(); 7948 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7949 return PrevTagDecl; 7950 } 7951 else if (EnumUnderlying && PrevEnum->isFixed()) { 7952 QualType T; 7953 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7954 T = TI->getType(); 7955 else 7956 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7957 7958 if (!Context.hasSameUnqualifiedType(T, 7959 PrevEnum->getIntegerType())) { 7960 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7961 diag::err_enum_redeclare_type_mismatch) 7962 << T 7963 << PrevEnum->getIntegerType(); 7964 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7965 return PrevTagDecl; 7966 } 7967 } 7968 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7969 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7970 << PrevEnum->isFixed(); 7971 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7972 return PrevTagDecl; 7973 } 7974 } 7975 7976 if (!Invalid) { 7977 // If this is a use, just return the declaration we found. 7978 7979 // FIXME: In the future, return a variant or some other clue 7980 // for the consumer of this Decl to know it doesn't own it. 7981 // For our current ASTs this shouldn't be a problem, but will 7982 // need to be changed with DeclGroups. 7983 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7984 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7985 return PrevTagDecl; 7986 7987 // Diagnose attempts to redefine a tag. 7988 if (TUK == TUK_Definition) { 7989 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7990 // If we're defining a specialization and the previous definition 7991 // is from an implicit instantiation, don't emit an error 7992 // here; we'll catch this in the general case below. 7993 if (!isExplicitSpecialization || 7994 !isa<CXXRecordDecl>(Def) || 7995 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7996 == TSK_ExplicitSpecialization) { 7997 Diag(NameLoc, diag::err_redefinition) << Name; 7998 Diag(Def->getLocation(), diag::note_previous_definition); 7999 // If this is a redefinition, recover by making this 8000 // struct be anonymous, which will make any later 8001 // references get the previous definition. 8002 Name = 0; 8003 Previous.clear(); 8004 Invalid = true; 8005 } 8006 } else { 8007 // If the type is currently being defined, complain 8008 // about a nested redefinition. 8009 const TagType *Tag 8010 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8011 if (Tag->isBeingDefined()) { 8012 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8013 Diag(PrevTagDecl->getLocation(), 8014 diag::note_previous_definition); 8015 Name = 0; 8016 Previous.clear(); 8017 Invalid = true; 8018 } 8019 } 8020 8021 // Okay, this is definition of a previously declared or referenced 8022 // tag PrevDecl. We're going to create a new Decl for it. 8023 } 8024 } 8025 // If we get here we have (another) forward declaration or we 8026 // have a definition. Just create a new decl. 8027 8028 } else { 8029 // If we get here, this is a definition of a new tag type in a nested 8030 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8031 // new decl/type. We set PrevDecl to NULL so that the entities 8032 // have distinct types. 8033 Previous.clear(); 8034 } 8035 // If we get here, we're going to create a new Decl. If PrevDecl 8036 // is non-NULL, it's a definition of the tag declared by 8037 // PrevDecl. If it's NULL, we have a new definition. 8038 8039 8040 // Otherwise, PrevDecl is not a tag, but was found with tag 8041 // lookup. This is only actually possible in C++, where a few 8042 // things like templates still live in the tag namespace. 8043 } else { 8044 // Use a better diagnostic if an elaborated-type-specifier 8045 // found the wrong kind of type on the first 8046 // (non-redeclaration) lookup. 8047 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8048 !Previous.isForRedeclaration()) { 8049 unsigned Kind = 0; 8050 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8051 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8052 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8053 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8054 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8055 Invalid = true; 8056 8057 // Otherwise, only diagnose if the declaration is in scope. 8058 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8059 isExplicitSpecialization)) { 8060 // do nothing 8061 8062 // Diagnose implicit declarations introduced by elaborated types. 8063 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8064 unsigned Kind = 0; 8065 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8066 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8067 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8068 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8069 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8070 Invalid = true; 8071 8072 // Otherwise it's a declaration. Call out a particularly common 8073 // case here. 8074 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8075 unsigned Kind = 0; 8076 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8077 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8078 << Name << Kind << TND->getUnderlyingType(); 8079 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8080 Invalid = true; 8081 8082 // Otherwise, diagnose. 8083 } else { 8084 // The tag name clashes with something else in the target scope, 8085 // issue an error and recover by making this tag be anonymous. 8086 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8087 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8088 Name = 0; 8089 Invalid = true; 8090 } 8091 8092 // The existing declaration isn't relevant to us; we're in a 8093 // new scope, so clear out the previous declaration. 8094 Previous.clear(); 8095 } 8096 } 8097 8098CreateNewDecl: 8099 8100 TagDecl *PrevDecl = 0; 8101 if (Previous.isSingleResult()) 8102 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8103 8104 // If there is an identifier, use the location of the identifier as the 8105 // location of the decl, otherwise use the location of the struct/union 8106 // keyword. 8107 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8108 8109 // Otherwise, create a new declaration. If there is a previous 8110 // declaration of the same entity, the two will be linked via 8111 // PrevDecl. 8112 TagDecl *New; 8113 8114 bool IsForwardReference = false; 8115 if (Kind == TTK_Enum) { 8116 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8117 // enum X { A, B, C } D; D should chain to X. 8118 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8119 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8120 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8121 // If this is an undefined enum, warn. 8122 if (TUK != TUK_Definition && !Invalid) { 8123 TagDecl *Def; 8124 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8125 // C++0x: 7.2p2: opaque-enum-declaration. 8126 // Conflicts are diagnosed above. Do nothing. 8127 } 8128 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8129 Diag(Loc, diag::ext_forward_ref_enum_def) 8130 << New; 8131 Diag(Def->getLocation(), diag::note_previous_definition); 8132 } else { 8133 unsigned DiagID = diag::ext_forward_ref_enum; 8134 if (getLangOptions().MicrosoftExt) 8135 DiagID = diag::ext_ms_forward_ref_enum; 8136 else if (getLangOptions().CPlusPlus) 8137 DiagID = diag::err_forward_ref_enum; 8138 Diag(Loc, DiagID); 8139 8140 // If this is a forward-declared reference to an enumeration, make a 8141 // note of it; we won't actually be introducing the declaration into 8142 // the declaration context. 8143 if (TUK == TUK_Reference) 8144 IsForwardReference = true; 8145 } 8146 } 8147 8148 if (EnumUnderlying) { 8149 EnumDecl *ED = cast<EnumDecl>(New); 8150 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8151 ED->setIntegerTypeSourceInfo(TI); 8152 else 8153 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8154 ED->setPromotionType(ED->getIntegerType()); 8155 } 8156 8157 } else { 8158 // struct/union/class 8159 8160 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8161 // struct X { int A; } D; D should chain to X. 8162 if (getLangOptions().CPlusPlus) { 8163 // FIXME: Look for a way to use RecordDecl for simple structs. 8164 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8165 cast_or_null<CXXRecordDecl>(PrevDecl)); 8166 8167 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8168 StdBadAlloc = cast<CXXRecordDecl>(New); 8169 } else 8170 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8171 cast_or_null<RecordDecl>(PrevDecl)); 8172 } 8173 8174 // Maybe add qualifier info. 8175 if (SS.isNotEmpty()) { 8176 if (SS.isSet()) { 8177 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8178 if (TemplateParameterLists.size() > 0) { 8179 New->setTemplateParameterListsInfo(Context, 8180 TemplateParameterLists.size(), 8181 (TemplateParameterList**) TemplateParameterLists.release()); 8182 } 8183 } 8184 else 8185 Invalid = true; 8186 } 8187 8188 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8189 // Add alignment attributes if necessary; these attributes are checked when 8190 // the ASTContext lays out the structure. 8191 // 8192 // It is important for implementing the correct semantics that this 8193 // happen here (in act on tag decl). The #pragma pack stack is 8194 // maintained as a result of parser callbacks which can occur at 8195 // many points during the parsing of a struct declaration (because 8196 // the #pragma tokens are effectively skipped over during the 8197 // parsing of the struct). 8198 AddAlignmentAttributesForRecord(RD); 8199 8200 AddMsStructLayoutForRecord(RD); 8201 } 8202 8203 if (ModulePrivateLoc.isValid()) { 8204 if (isExplicitSpecialization) 8205 Diag(New->getLocation(), diag::err_module_private_specialization) 8206 << 2 8207 << FixItHint::CreateRemoval(ModulePrivateLoc); 8208 // __module_private__ does not apply to local classes. However, we only 8209 // diagnose this as an error when the declaration specifiers are 8210 // freestanding. Here, we just ignore the __module_private__. 8211 else if (!SearchDC->isFunctionOrMethod()) 8212 New->setModulePrivate(); 8213 } 8214 8215 // If this is a specialization of a member class (of a class template), 8216 // check the specialization. 8217 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8218 Invalid = true; 8219 8220 if (Invalid) 8221 New->setInvalidDecl(); 8222 8223 if (Attr) 8224 ProcessDeclAttributeList(S, New, Attr); 8225 8226 // If we're declaring or defining a tag in function prototype scope 8227 // in C, note that this type can only be used within the function. 8228 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8229 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8230 8231 // Set the lexical context. If the tag has a C++ scope specifier, the 8232 // lexical context will be different from the semantic context. 8233 New->setLexicalDeclContext(CurContext); 8234 8235 // Mark this as a friend decl if applicable. 8236 // In Microsoft mode, a friend declaration also acts as a forward 8237 // declaration so we always pass true to setObjectOfFriendDecl to make 8238 // the tag name visible. 8239 if (TUK == TUK_Friend) 8240 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8241 getLangOptions().MicrosoftExt); 8242 8243 // Set the access specifier. 8244 if (!Invalid && SearchDC->isRecord()) 8245 SetMemberAccessSpecifier(New, PrevDecl, AS); 8246 8247 if (TUK == TUK_Definition) 8248 New->startDefinition(); 8249 8250 // If this has an identifier, add it to the scope stack. 8251 if (TUK == TUK_Friend) { 8252 // We might be replacing an existing declaration in the lookup tables; 8253 // if so, borrow its access specifier. 8254 if (PrevDecl) 8255 New->setAccess(PrevDecl->getAccess()); 8256 8257 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8258 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8259 if (Name) // can be null along some error paths 8260 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8261 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8262 } else if (Name) { 8263 S = getNonFieldDeclScope(S); 8264 PushOnScopeChains(New, S, !IsForwardReference); 8265 if (IsForwardReference) 8266 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8267 8268 } else { 8269 CurContext->addDecl(New); 8270 } 8271 8272 // If this is the C FILE type, notify the AST context. 8273 if (IdentifierInfo *II = New->getIdentifier()) 8274 if (!New->isInvalidDecl() && 8275 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8276 II->isStr("FILE")) 8277 Context.setFILEDecl(New); 8278 8279 OwnedDecl = true; 8280 return New; 8281} 8282 8283void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8284 AdjustDeclIfTemplate(TagD); 8285 TagDecl *Tag = cast<TagDecl>(TagD); 8286 8287 // Enter the tag context. 8288 PushDeclContext(S, Tag); 8289} 8290 8291Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8292 assert(isa<ObjCContainerDecl>(IDecl) && 8293 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8294 DeclContext *OCD = cast<DeclContext>(IDecl); 8295 assert(getContainingDC(OCD) == CurContext && 8296 "The next DeclContext should be lexically contained in the current one."); 8297 CurContext = OCD; 8298 return IDecl; 8299} 8300 8301void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8302 SourceLocation FinalLoc, 8303 SourceLocation LBraceLoc) { 8304 AdjustDeclIfTemplate(TagD); 8305 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8306 8307 FieldCollector->StartClass(); 8308 8309 if (!Record->getIdentifier()) 8310 return; 8311 8312 if (FinalLoc.isValid()) 8313 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8314 8315 // C++ [class]p2: 8316 // [...] The class-name is also inserted into the scope of the 8317 // class itself; this is known as the injected-class-name. For 8318 // purposes of access checking, the injected-class-name is treated 8319 // as if it were a public member name. 8320 CXXRecordDecl *InjectedClassName 8321 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8322 Record->getLocStart(), Record->getLocation(), 8323 Record->getIdentifier(), 8324 /*PrevDecl=*/0, 8325 /*DelayTypeCreation=*/true); 8326 Context.getTypeDeclType(InjectedClassName, Record); 8327 InjectedClassName->setImplicit(); 8328 InjectedClassName->setAccess(AS_public); 8329 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8330 InjectedClassName->setDescribedClassTemplate(Template); 8331 PushOnScopeChains(InjectedClassName, S); 8332 assert(InjectedClassName->isInjectedClassName() && 8333 "Broken injected-class-name"); 8334} 8335 8336void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8337 SourceLocation RBraceLoc) { 8338 AdjustDeclIfTemplate(TagD); 8339 TagDecl *Tag = cast<TagDecl>(TagD); 8340 Tag->setRBraceLoc(RBraceLoc); 8341 8342 if (isa<CXXRecordDecl>(Tag)) 8343 FieldCollector->FinishClass(); 8344 8345 // Exit this scope of this tag's definition. 8346 PopDeclContext(); 8347 8348 // Notify the consumer that we've defined a tag. 8349 Consumer.HandleTagDeclDefinition(Tag); 8350} 8351 8352void Sema::ActOnObjCContainerFinishDefinition() { 8353 // Exit this scope of this interface definition. 8354 PopDeclContext(); 8355} 8356 8357void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8358 assert(DC == CurContext && "Mismatch of container contexts"); 8359 OriginalLexicalContext = DC; 8360 ActOnObjCContainerFinishDefinition(); 8361} 8362 8363void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8364 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8365 OriginalLexicalContext = 0; 8366} 8367 8368void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8369 AdjustDeclIfTemplate(TagD); 8370 TagDecl *Tag = cast<TagDecl>(TagD); 8371 Tag->setInvalidDecl(); 8372 8373 // We're undoing ActOnTagStartDefinition here, not 8374 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8375 // the FieldCollector. 8376 8377 PopDeclContext(); 8378} 8379 8380// Note that FieldName may be null for anonymous bitfields. 8381bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8382 QualType FieldTy, const Expr *BitWidth, 8383 bool *ZeroWidth) { 8384 // Default to true; that shouldn't confuse checks for emptiness 8385 if (ZeroWidth) 8386 *ZeroWidth = true; 8387 8388 // C99 6.7.2.1p4 - verify the field type. 8389 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8390 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8391 // Handle incomplete types with specific error. 8392 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8393 return true; 8394 if (FieldName) 8395 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8396 << FieldName << FieldTy << BitWidth->getSourceRange(); 8397 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8398 << FieldTy << BitWidth->getSourceRange(); 8399 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8400 UPPC_BitFieldWidth)) 8401 return true; 8402 8403 // If the bit-width is type- or value-dependent, don't try to check 8404 // it now. 8405 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8406 return false; 8407 8408 llvm::APSInt Value; 8409 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8410 return true; 8411 8412 if (Value != 0 && ZeroWidth) 8413 *ZeroWidth = false; 8414 8415 // Zero-width bitfield is ok for anonymous field. 8416 if (Value == 0 && FieldName) 8417 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8418 8419 if (Value.isSigned() && Value.isNegative()) { 8420 if (FieldName) 8421 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8422 << FieldName << Value.toString(10); 8423 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8424 << Value.toString(10); 8425 } 8426 8427 if (!FieldTy->isDependentType()) { 8428 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8429 if (Value.getZExtValue() > TypeSize) { 8430 if (!getLangOptions().CPlusPlus) { 8431 if (FieldName) 8432 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8433 << FieldName << (unsigned)Value.getZExtValue() 8434 << (unsigned)TypeSize; 8435 8436 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8437 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8438 } 8439 8440 if (FieldName) 8441 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8442 << FieldName << (unsigned)Value.getZExtValue() 8443 << (unsigned)TypeSize; 8444 else 8445 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8446 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8447 } 8448 } 8449 8450 return false; 8451} 8452 8453/// ActOnField - Each field of a C struct/union is passed into this in order 8454/// to create a FieldDecl object for it. 8455Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8456 Declarator &D, Expr *BitfieldWidth) { 8457 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8458 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8459 /*HasInit=*/false, AS_public); 8460 return Res; 8461} 8462 8463/// HandleField - Analyze a field of a C struct or a C++ data member. 8464/// 8465FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8466 SourceLocation DeclStart, 8467 Declarator &D, Expr *BitWidth, bool HasInit, 8468 AccessSpecifier AS) { 8469 IdentifierInfo *II = D.getIdentifier(); 8470 SourceLocation Loc = DeclStart; 8471 if (II) Loc = D.getIdentifierLoc(); 8472 8473 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8474 QualType T = TInfo->getType(); 8475 if (getLangOptions().CPlusPlus) { 8476 CheckExtraCXXDefaultArguments(D); 8477 8478 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8479 UPPC_DataMemberType)) { 8480 D.setInvalidType(); 8481 T = Context.IntTy; 8482 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8483 } 8484 } 8485 8486 DiagnoseFunctionSpecifiers(D); 8487 8488 if (D.getDeclSpec().isThreadSpecified()) 8489 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8490 if (D.getDeclSpec().isConstexprSpecified()) 8491 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8492 << 2; 8493 8494 // Check to see if this name was declared as a member previously 8495 NamedDecl *PrevDecl = 0; 8496 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8497 LookupName(Previous, S); 8498 switch (Previous.getResultKind()) { 8499 case LookupResult::Found: 8500 case LookupResult::FoundUnresolvedValue: 8501 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8502 break; 8503 8504 case LookupResult::FoundOverloaded: 8505 PrevDecl = Previous.getRepresentativeDecl(); 8506 break; 8507 8508 case LookupResult::NotFound: 8509 case LookupResult::NotFoundInCurrentInstantiation: 8510 case LookupResult::Ambiguous: 8511 break; 8512 } 8513 Previous.suppressDiagnostics(); 8514 8515 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8516 // Maybe we will complain about the shadowed template parameter. 8517 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8518 // Just pretend that we didn't see the previous declaration. 8519 PrevDecl = 0; 8520 } 8521 8522 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8523 PrevDecl = 0; 8524 8525 bool Mutable 8526 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8527 SourceLocation TSSL = D.getSourceRange().getBegin(); 8528 FieldDecl *NewFD 8529 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8530 TSSL, AS, PrevDecl, &D); 8531 8532 if (NewFD->isInvalidDecl()) 8533 Record->setInvalidDecl(); 8534 8535 if (D.getDeclSpec().isModulePrivateSpecified()) 8536 NewFD->setModulePrivate(); 8537 8538 if (NewFD->isInvalidDecl() && PrevDecl) { 8539 // Don't introduce NewFD into scope; there's already something 8540 // with the same name in the same scope. 8541 } else if (II) { 8542 PushOnScopeChains(NewFD, S); 8543 } else 8544 Record->addDecl(NewFD); 8545 8546 return NewFD; 8547} 8548 8549/// \brief Build a new FieldDecl and check its well-formedness. 8550/// 8551/// This routine builds a new FieldDecl given the fields name, type, 8552/// record, etc. \p PrevDecl should refer to any previous declaration 8553/// with the same name and in the same scope as the field to be 8554/// created. 8555/// 8556/// \returns a new FieldDecl. 8557/// 8558/// \todo The Declarator argument is a hack. It will be removed once 8559FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8560 TypeSourceInfo *TInfo, 8561 RecordDecl *Record, SourceLocation Loc, 8562 bool Mutable, Expr *BitWidth, bool HasInit, 8563 SourceLocation TSSL, 8564 AccessSpecifier AS, NamedDecl *PrevDecl, 8565 Declarator *D) { 8566 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8567 bool InvalidDecl = false; 8568 if (D) InvalidDecl = D->isInvalidType(); 8569 8570 // If we receive a broken type, recover by assuming 'int' and 8571 // marking this declaration as invalid. 8572 if (T.isNull()) { 8573 InvalidDecl = true; 8574 T = Context.IntTy; 8575 } 8576 8577 QualType EltTy = Context.getBaseElementType(T); 8578 if (!EltTy->isDependentType() && 8579 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8580 // Fields of incomplete type force their record to be invalid. 8581 Record->setInvalidDecl(); 8582 InvalidDecl = true; 8583 } 8584 8585 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8586 // than a variably modified type. 8587 if (!InvalidDecl && T->isVariablyModifiedType()) { 8588 bool SizeIsNegative; 8589 llvm::APSInt Oversized; 8590 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8591 SizeIsNegative, 8592 Oversized); 8593 if (!FixedTy.isNull()) { 8594 Diag(Loc, diag::warn_illegal_constant_array_size); 8595 T = FixedTy; 8596 } else { 8597 if (SizeIsNegative) 8598 Diag(Loc, diag::err_typecheck_negative_array_size); 8599 else if (Oversized.getBoolValue()) 8600 Diag(Loc, diag::err_array_too_large) 8601 << Oversized.toString(10); 8602 else 8603 Diag(Loc, diag::err_typecheck_field_variable_size); 8604 InvalidDecl = true; 8605 } 8606 } 8607 8608 // Fields can not have abstract class types 8609 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8610 diag::err_abstract_type_in_decl, 8611 AbstractFieldType)) 8612 InvalidDecl = true; 8613 8614 bool ZeroWidth = false; 8615 // If this is declared as a bit-field, check the bit-field. 8616 if (!InvalidDecl && BitWidth && 8617 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8618 InvalidDecl = true; 8619 BitWidth = 0; 8620 ZeroWidth = false; 8621 } 8622 8623 // Check that 'mutable' is consistent with the type of the declaration. 8624 if (!InvalidDecl && Mutable) { 8625 unsigned DiagID = 0; 8626 if (T->isReferenceType()) 8627 DiagID = diag::err_mutable_reference; 8628 else if (T.isConstQualified()) 8629 DiagID = diag::err_mutable_const; 8630 8631 if (DiagID) { 8632 SourceLocation ErrLoc = Loc; 8633 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8634 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8635 Diag(ErrLoc, DiagID); 8636 Mutable = false; 8637 InvalidDecl = true; 8638 } 8639 } 8640 8641 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8642 BitWidth, Mutable, HasInit); 8643 if (InvalidDecl) 8644 NewFD->setInvalidDecl(); 8645 8646 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8647 Diag(Loc, diag::err_duplicate_member) << II; 8648 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8649 NewFD->setInvalidDecl(); 8650 } 8651 8652 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8653 if (Record->isUnion()) { 8654 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8655 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8656 if (RDecl->getDefinition()) { 8657 // C++ [class.union]p1: An object of a class with a non-trivial 8658 // constructor, a non-trivial copy constructor, a non-trivial 8659 // destructor, or a non-trivial copy assignment operator 8660 // cannot be a member of a union, nor can an array of such 8661 // objects. 8662 if (CheckNontrivialField(NewFD)) 8663 NewFD->setInvalidDecl(); 8664 } 8665 } 8666 8667 // C++ [class.union]p1: If a union contains a member of reference type, 8668 // the program is ill-formed. 8669 if (EltTy->isReferenceType()) { 8670 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8671 << NewFD->getDeclName() << EltTy; 8672 NewFD->setInvalidDecl(); 8673 } 8674 } 8675 } 8676 8677 // FIXME: We need to pass in the attributes given an AST 8678 // representation, not a parser representation. 8679 if (D) 8680 // FIXME: What to pass instead of TUScope? 8681 ProcessDeclAttributes(TUScope, NewFD, *D); 8682 8683 // In auto-retain/release, infer strong retension for fields of 8684 // retainable type. 8685 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8686 NewFD->setInvalidDecl(); 8687 8688 if (T.isObjCGCWeak()) 8689 Diag(Loc, diag::warn_attribute_weak_on_field); 8690 8691 NewFD->setAccess(AS); 8692 return NewFD; 8693} 8694 8695bool Sema::CheckNontrivialField(FieldDecl *FD) { 8696 assert(FD); 8697 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8698 8699 if (FD->isInvalidDecl()) 8700 return true; 8701 8702 QualType EltTy = Context.getBaseElementType(FD->getType()); 8703 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8704 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8705 if (RDecl->getDefinition()) { 8706 // We check for copy constructors before constructors 8707 // because otherwise we'll never get complaints about 8708 // copy constructors. 8709 8710 CXXSpecialMember member = CXXInvalid; 8711 if (!RDecl->hasTrivialCopyConstructor()) 8712 member = CXXCopyConstructor; 8713 else if (!RDecl->hasTrivialDefaultConstructor()) 8714 member = CXXDefaultConstructor; 8715 else if (!RDecl->hasTrivialCopyAssignment()) 8716 member = CXXCopyAssignment; 8717 else if (!RDecl->hasTrivialDestructor()) 8718 member = CXXDestructor; 8719 8720 if (member != CXXInvalid) { 8721 if (!getLangOptions().CPlusPlus0x && 8722 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8723 // Objective-C++ ARC: it is an error to have a non-trivial field of 8724 // a union. However, system headers in Objective-C programs 8725 // occasionally have Objective-C lifetime objects within unions, 8726 // and rather than cause the program to fail, we make those 8727 // members unavailable. 8728 SourceLocation Loc = FD->getLocation(); 8729 if (getSourceManager().isInSystemHeader(Loc)) { 8730 if (!FD->hasAttr<UnavailableAttr>()) 8731 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8732 "this system field has retaining ownership")); 8733 return false; 8734 } 8735 } 8736 8737 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8738 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8739 diag::err_illegal_union_or_anon_struct_member) 8740 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8741 DiagnoseNontrivial(RT, member); 8742 return !getLangOptions().CPlusPlus0x; 8743 } 8744 } 8745 } 8746 8747 return false; 8748} 8749 8750/// DiagnoseNontrivial - Given that a class has a non-trivial 8751/// special member, figure out why. 8752void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8753 QualType QT(T, 0U); 8754 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8755 8756 // Check whether the member was user-declared. 8757 switch (member) { 8758 case CXXInvalid: 8759 break; 8760 8761 case CXXDefaultConstructor: 8762 if (RD->hasUserDeclaredConstructor()) { 8763 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8764 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8765 const FunctionDecl *body = 0; 8766 ci->hasBody(body); 8767 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8768 SourceLocation CtorLoc = ci->getLocation(); 8769 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8770 return; 8771 } 8772 } 8773 8774 llvm_unreachable("found no user-declared constructors"); 8775 } 8776 break; 8777 8778 case CXXCopyConstructor: 8779 if (RD->hasUserDeclaredCopyConstructor()) { 8780 SourceLocation CtorLoc = 8781 RD->getCopyConstructor(0)->getLocation(); 8782 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8783 return; 8784 } 8785 break; 8786 8787 case CXXMoveConstructor: 8788 if (RD->hasUserDeclaredMoveConstructor()) { 8789 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8790 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8791 return; 8792 } 8793 break; 8794 8795 case CXXCopyAssignment: 8796 if (RD->hasUserDeclaredCopyAssignment()) { 8797 // FIXME: this should use the location of the copy 8798 // assignment, not the type. 8799 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8800 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8801 return; 8802 } 8803 break; 8804 8805 case CXXMoveAssignment: 8806 if (RD->hasUserDeclaredMoveAssignment()) { 8807 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8808 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8809 return; 8810 } 8811 break; 8812 8813 case CXXDestructor: 8814 if (RD->hasUserDeclaredDestructor()) { 8815 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8816 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8817 return; 8818 } 8819 break; 8820 } 8821 8822 typedef CXXRecordDecl::base_class_iterator base_iter; 8823 8824 // Virtual bases and members inhibit trivial copying/construction, 8825 // but not trivial destruction. 8826 if (member != CXXDestructor) { 8827 // Check for virtual bases. vbases includes indirect virtual bases, 8828 // so we just iterate through the direct bases. 8829 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8830 if (bi->isVirtual()) { 8831 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8832 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8833 return; 8834 } 8835 8836 // Check for virtual methods. 8837 typedef CXXRecordDecl::method_iterator meth_iter; 8838 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8839 ++mi) { 8840 if (mi->isVirtual()) { 8841 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8842 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8843 return; 8844 } 8845 } 8846 } 8847 8848 bool (CXXRecordDecl::*hasTrivial)() const; 8849 switch (member) { 8850 case CXXDefaultConstructor: 8851 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8852 case CXXCopyConstructor: 8853 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8854 case CXXCopyAssignment: 8855 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8856 case CXXDestructor: 8857 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8858 default: 8859 llvm_unreachable("unexpected special member"); 8860 } 8861 8862 // Check for nontrivial bases (and recurse). 8863 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8864 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8865 assert(BaseRT && "Don't know how to handle dependent bases"); 8866 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8867 if (!(BaseRecTy->*hasTrivial)()) { 8868 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8869 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8870 DiagnoseNontrivial(BaseRT, member); 8871 return; 8872 } 8873 } 8874 8875 // Check for nontrivial members (and recurse). 8876 typedef RecordDecl::field_iterator field_iter; 8877 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8878 ++fi) { 8879 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8880 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8881 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8882 8883 if (!(EltRD->*hasTrivial)()) { 8884 SourceLocation FLoc = (*fi)->getLocation(); 8885 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8886 DiagnoseNontrivial(EltRT, member); 8887 return; 8888 } 8889 } 8890 8891 if (EltTy->isObjCLifetimeType()) { 8892 switch (EltTy.getObjCLifetime()) { 8893 case Qualifiers::OCL_None: 8894 case Qualifiers::OCL_ExplicitNone: 8895 break; 8896 8897 case Qualifiers::OCL_Autoreleasing: 8898 case Qualifiers::OCL_Weak: 8899 case Qualifiers::OCL_Strong: 8900 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8901 << QT << EltTy.getObjCLifetime(); 8902 return; 8903 } 8904 } 8905 } 8906 8907 llvm_unreachable("found no explanation for non-trivial member"); 8908} 8909 8910/// TranslateIvarVisibility - Translate visibility from a token ID to an 8911/// AST enum value. 8912static ObjCIvarDecl::AccessControl 8913TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8914 switch (ivarVisibility) { 8915 default: llvm_unreachable("Unknown visitibility kind"); 8916 case tok::objc_private: return ObjCIvarDecl::Private; 8917 case tok::objc_public: return ObjCIvarDecl::Public; 8918 case tok::objc_protected: return ObjCIvarDecl::Protected; 8919 case tok::objc_package: return ObjCIvarDecl::Package; 8920 } 8921} 8922 8923/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8924/// in order to create an IvarDecl object for it. 8925Decl *Sema::ActOnIvar(Scope *S, 8926 SourceLocation DeclStart, 8927 Declarator &D, Expr *BitfieldWidth, 8928 tok::ObjCKeywordKind Visibility) { 8929 8930 IdentifierInfo *II = D.getIdentifier(); 8931 Expr *BitWidth = (Expr*)BitfieldWidth; 8932 SourceLocation Loc = DeclStart; 8933 if (II) Loc = D.getIdentifierLoc(); 8934 8935 // FIXME: Unnamed fields can be handled in various different ways, for 8936 // example, unnamed unions inject all members into the struct namespace! 8937 8938 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8939 QualType T = TInfo->getType(); 8940 8941 if (BitWidth) { 8942 // 6.7.2.1p3, 6.7.2.1p4 8943 if (VerifyBitField(Loc, II, T, BitWidth)) { 8944 D.setInvalidType(); 8945 BitWidth = 0; 8946 } 8947 } else { 8948 // Not a bitfield. 8949 8950 // validate II. 8951 8952 } 8953 if (T->isReferenceType()) { 8954 Diag(Loc, diag::err_ivar_reference_type); 8955 D.setInvalidType(); 8956 } 8957 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8958 // than a variably modified type. 8959 else if (T->isVariablyModifiedType()) { 8960 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8961 D.setInvalidType(); 8962 } 8963 8964 // Get the visibility (access control) for this ivar. 8965 ObjCIvarDecl::AccessControl ac = 8966 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8967 : ObjCIvarDecl::None; 8968 // Must set ivar's DeclContext to its enclosing interface. 8969 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8970 ObjCContainerDecl *EnclosingContext; 8971 if (ObjCImplementationDecl *IMPDecl = 8972 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8973 if (!LangOpts.ObjCNonFragileABI2) { 8974 // Case of ivar declared in an implementation. Context is that of its class. 8975 EnclosingContext = IMPDecl->getClassInterface(); 8976 assert(EnclosingContext && "Implementation has no class interface!"); 8977 } 8978 else 8979 EnclosingContext = EnclosingDecl; 8980 } else { 8981 if (ObjCCategoryDecl *CDecl = 8982 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8983 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8984 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8985 return 0; 8986 } 8987 } 8988 EnclosingContext = EnclosingDecl; 8989 } 8990 8991 // Construct the decl. 8992 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8993 DeclStart, Loc, II, T, 8994 TInfo, ac, (Expr *)BitfieldWidth); 8995 8996 if (II) { 8997 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8998 ForRedeclaration); 8999 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9000 && !isa<TagDecl>(PrevDecl)) { 9001 Diag(Loc, diag::err_duplicate_member) << II; 9002 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9003 NewID->setInvalidDecl(); 9004 } 9005 } 9006 9007 // Process attributes attached to the ivar. 9008 ProcessDeclAttributes(S, NewID, D); 9009 9010 if (D.isInvalidType()) 9011 NewID->setInvalidDecl(); 9012 9013 // In ARC, infer 'retaining' for ivars of retainable type. 9014 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9015 NewID->setInvalidDecl(); 9016 9017 if (D.getDeclSpec().isModulePrivateSpecified()) 9018 NewID->setModulePrivate(); 9019 9020 if (II) { 9021 // FIXME: When interfaces are DeclContexts, we'll need to add 9022 // these to the interface. 9023 S->AddDecl(NewID); 9024 IdResolver.AddDecl(NewID); 9025 } 9026 9027 return NewID; 9028} 9029 9030/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9031/// class and class extensions. For every class @interface and class 9032/// extension @interface, if the last ivar is a bitfield of any type, 9033/// then add an implicit `char :0` ivar to the end of that interface. 9034void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9035 SmallVectorImpl<Decl *> &AllIvarDecls) { 9036 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9037 return; 9038 9039 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9040 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9041 9042 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9043 return; 9044 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9045 if (!ID) { 9046 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9047 if (!CD->IsClassExtension()) 9048 return; 9049 } 9050 // No need to add this to end of @implementation. 9051 else 9052 return; 9053 } 9054 // All conditions are met. Add a new bitfield to the tail end of ivars. 9055 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9056 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9057 9058 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9059 DeclLoc, DeclLoc, 0, 9060 Context.CharTy, 9061 Context.getTrivialTypeSourceInfo(Context.CharTy, 9062 DeclLoc), 9063 ObjCIvarDecl::Private, BW, 9064 true); 9065 AllIvarDecls.push_back(Ivar); 9066} 9067 9068void Sema::ActOnFields(Scope* S, 9069 SourceLocation RecLoc, Decl *EnclosingDecl, 9070 llvm::ArrayRef<Decl *> Fields, 9071 SourceLocation LBrac, SourceLocation RBrac, 9072 AttributeList *Attr) { 9073 assert(EnclosingDecl && "missing record or interface decl"); 9074 9075 // If the decl this is being inserted into is invalid, then it may be a 9076 // redeclaration or some other bogus case. Don't try to add fields to it. 9077 if (EnclosingDecl->isInvalidDecl()) 9078 return; 9079 9080 // Verify that all the fields are okay. 9081 unsigned NumNamedMembers = 0; 9082 SmallVector<FieldDecl*, 32> RecFields; 9083 9084 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9085 bool ARCErrReported = false; 9086 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9087 i != end; ++i) { 9088 FieldDecl *FD = cast<FieldDecl>(*i); 9089 9090 // Get the type for the field. 9091 const Type *FDTy = FD->getType().getTypePtr(); 9092 9093 if (!FD->isAnonymousStructOrUnion()) { 9094 // Remember all fields written by the user. 9095 RecFields.push_back(FD); 9096 } 9097 9098 // If the field is already invalid for some reason, don't emit more 9099 // diagnostics about it. 9100 if (FD->isInvalidDecl()) { 9101 EnclosingDecl->setInvalidDecl(); 9102 continue; 9103 } 9104 9105 // C99 6.7.2.1p2: 9106 // A structure or union shall not contain a member with 9107 // incomplete or function type (hence, a structure shall not 9108 // contain an instance of itself, but may contain a pointer to 9109 // an instance of itself), except that the last member of a 9110 // structure with more than one named member may have incomplete 9111 // array type; such a structure (and any union containing, 9112 // possibly recursively, a member that is such a structure) 9113 // shall not be a member of a structure or an element of an 9114 // array. 9115 if (FDTy->isFunctionType()) { 9116 // Field declared as a function. 9117 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9118 << FD->getDeclName(); 9119 FD->setInvalidDecl(); 9120 EnclosingDecl->setInvalidDecl(); 9121 continue; 9122 } else if (FDTy->isIncompleteArrayType() && Record && 9123 ((i + 1 == Fields.end() && !Record->isUnion()) || 9124 ((getLangOptions().MicrosoftExt || 9125 getLangOptions().CPlusPlus) && 9126 (i + 1 == Fields.end() || Record->isUnion())))) { 9127 // Flexible array member. 9128 // Microsoft and g++ is more permissive regarding flexible array. 9129 // It will accept flexible array in union and also 9130 // as the sole element of a struct/class. 9131 if (getLangOptions().MicrosoftExt) { 9132 if (Record->isUnion()) 9133 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9134 << FD->getDeclName(); 9135 else if (Fields.size() == 1) 9136 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9137 << FD->getDeclName() << Record->getTagKind(); 9138 } else if (getLangOptions().CPlusPlus) { 9139 if (Record->isUnion()) 9140 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9141 << FD->getDeclName(); 9142 else if (Fields.size() == 1) 9143 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9144 << FD->getDeclName() << Record->getTagKind(); 9145 } else if (NumNamedMembers < 1) { 9146 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9147 << FD->getDeclName(); 9148 FD->setInvalidDecl(); 9149 EnclosingDecl->setInvalidDecl(); 9150 continue; 9151 } 9152 if (!FD->getType()->isDependentType() && 9153 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9154 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9155 << FD->getDeclName() << FD->getType(); 9156 FD->setInvalidDecl(); 9157 EnclosingDecl->setInvalidDecl(); 9158 continue; 9159 } 9160 // Okay, we have a legal flexible array member at the end of the struct. 9161 if (Record) 9162 Record->setHasFlexibleArrayMember(true); 9163 } else if (!FDTy->isDependentType() && 9164 RequireCompleteType(FD->getLocation(), FD->getType(), 9165 diag::err_field_incomplete)) { 9166 // Incomplete type 9167 FD->setInvalidDecl(); 9168 EnclosingDecl->setInvalidDecl(); 9169 continue; 9170 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9171 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9172 // If this is a member of a union, then entire union becomes "flexible". 9173 if (Record && Record->isUnion()) { 9174 Record->setHasFlexibleArrayMember(true); 9175 } else { 9176 // If this is a struct/class and this is not the last element, reject 9177 // it. Note that GCC supports variable sized arrays in the middle of 9178 // structures. 9179 if (i + 1 != Fields.end()) 9180 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9181 << FD->getDeclName() << FD->getType(); 9182 else { 9183 // We support flexible arrays at the end of structs in 9184 // other structs as an extension. 9185 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9186 << FD->getDeclName(); 9187 if (Record) 9188 Record->setHasFlexibleArrayMember(true); 9189 } 9190 } 9191 } 9192 if (Record && FDTTy->getDecl()->hasObjectMember()) 9193 Record->setHasObjectMember(true); 9194 } else if (FDTy->isObjCObjectType()) { 9195 /// A field cannot be an Objective-c object 9196 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9197 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9198 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9199 FD->setType(T); 9200 } 9201 else if (!getLangOptions().CPlusPlus) { 9202 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9203 // It's an error in ARC if a field has lifetime. 9204 // We don't want to report this in a system header, though, 9205 // so we just make the field unavailable. 9206 // FIXME: that's really not sufficient; we need to make the type 9207 // itself invalid to, say, initialize or copy. 9208 QualType T = FD->getType(); 9209 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9210 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9211 SourceLocation loc = FD->getLocation(); 9212 if (getSourceManager().isInSystemHeader(loc)) { 9213 if (!FD->hasAttr<UnavailableAttr>()) { 9214 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9215 "this system field has retaining ownership")); 9216 } 9217 } else { 9218 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9219 << T->isBlockPointerType(); 9220 } 9221 ARCErrReported = true; 9222 } 9223 } 9224 else if (getLangOptions().ObjC1 && 9225 getLangOptions().getGC() != LangOptions::NonGC && 9226 Record && !Record->hasObjectMember()) { 9227 if (FD->getType()->isObjCObjectPointerType() || 9228 FD->getType().isObjCGCStrong()) 9229 Record->setHasObjectMember(true); 9230 else if (Context.getAsArrayType(FD->getType())) { 9231 QualType BaseType = Context.getBaseElementType(FD->getType()); 9232 if (BaseType->isRecordType() && 9233 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9234 Record->setHasObjectMember(true); 9235 else if (BaseType->isObjCObjectPointerType() || 9236 BaseType.isObjCGCStrong()) 9237 Record->setHasObjectMember(true); 9238 } 9239 } 9240 } 9241 // Keep track of the number of named members. 9242 if (FD->getIdentifier()) 9243 ++NumNamedMembers; 9244 } 9245 9246 // Okay, we successfully defined 'Record'. 9247 if (Record) { 9248 bool Completed = false; 9249 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9250 if (!CXXRecord->isInvalidDecl()) { 9251 // Set access bits correctly on the directly-declared conversions. 9252 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9253 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9254 I != E; ++I) 9255 Convs->setAccess(I, (*I)->getAccess()); 9256 9257 if (!CXXRecord->isDependentType()) { 9258 // Objective-C Automatic Reference Counting: 9259 // If a class has a non-static data member of Objective-C pointer 9260 // type (or array thereof), it is a non-POD type and its 9261 // default constructor (if any), copy constructor, copy assignment 9262 // operator, and destructor are non-trivial. 9263 // 9264 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9265 // However, here we check whether this particular class is only 9266 // non-POD because of the presence of an Objective-C pointer member. 9267 // If so, objects of this type cannot be shared between code compiled 9268 // with instant objects and code compiled with manual retain/release. 9269 if (getLangOptions().ObjCAutoRefCount && 9270 CXXRecord->hasObjectMember() && 9271 CXXRecord->getLinkage() == ExternalLinkage) { 9272 if (CXXRecord->isPOD()) { 9273 Diag(CXXRecord->getLocation(), 9274 diag::warn_arc_non_pod_class_with_object_member) 9275 << CXXRecord; 9276 } else { 9277 // FIXME: Fix-Its would be nice here, but finding a good location 9278 // for them is going to be tricky. 9279 if (CXXRecord->hasTrivialCopyConstructor()) 9280 Diag(CXXRecord->getLocation(), 9281 diag::warn_arc_trivial_member_function_with_object_member) 9282 << CXXRecord << 0; 9283 if (CXXRecord->hasTrivialCopyAssignment()) 9284 Diag(CXXRecord->getLocation(), 9285 diag::warn_arc_trivial_member_function_with_object_member) 9286 << CXXRecord << 1; 9287 if (CXXRecord->hasTrivialDestructor()) 9288 Diag(CXXRecord->getLocation(), 9289 diag::warn_arc_trivial_member_function_with_object_member) 9290 << CXXRecord << 2; 9291 } 9292 } 9293 9294 // Adjust user-defined destructor exception spec. 9295 if (getLangOptions().CPlusPlus0x && 9296 CXXRecord->hasUserDeclaredDestructor()) 9297 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9298 9299 // Add any implicitly-declared members to this class. 9300 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9301 9302 // If we have virtual base classes, we may end up finding multiple 9303 // final overriders for a given virtual function. Check for this 9304 // problem now. 9305 if (CXXRecord->getNumVBases()) { 9306 CXXFinalOverriderMap FinalOverriders; 9307 CXXRecord->getFinalOverriders(FinalOverriders); 9308 9309 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9310 MEnd = FinalOverriders.end(); 9311 M != MEnd; ++M) { 9312 for (OverridingMethods::iterator SO = M->second.begin(), 9313 SOEnd = M->second.end(); 9314 SO != SOEnd; ++SO) { 9315 assert(SO->second.size() > 0 && 9316 "Virtual function without overridding functions?"); 9317 if (SO->second.size() == 1) 9318 continue; 9319 9320 // C++ [class.virtual]p2: 9321 // In a derived class, if a virtual member function of a base 9322 // class subobject has more than one final overrider the 9323 // program is ill-formed. 9324 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9325 << (NamedDecl *)M->first << Record; 9326 Diag(M->first->getLocation(), 9327 diag::note_overridden_virtual_function); 9328 for (OverridingMethods::overriding_iterator 9329 OM = SO->second.begin(), 9330 OMEnd = SO->second.end(); 9331 OM != OMEnd; ++OM) 9332 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9333 << (NamedDecl *)M->first << OM->Method->getParent(); 9334 9335 Record->setInvalidDecl(); 9336 } 9337 } 9338 CXXRecord->completeDefinition(&FinalOverriders); 9339 Completed = true; 9340 } 9341 } 9342 } 9343 } 9344 9345 if (!Completed) 9346 Record->completeDefinition(); 9347 9348 // Now that the record is complete, do any delayed exception spec checks 9349 // we were missing. 9350 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9351 const CXXDestructorDecl *Dtor = 9352 DelayedDestructorExceptionSpecChecks.back().first; 9353 if (Dtor->getParent() != Record) 9354 break; 9355 9356 assert(!Dtor->getParent()->isDependentType() && 9357 "Should not ever add destructors of templates into the list."); 9358 CheckOverridingFunctionExceptionSpec(Dtor, 9359 DelayedDestructorExceptionSpecChecks.back().second); 9360 DelayedDestructorExceptionSpecChecks.pop_back(); 9361 } 9362 9363 } else { 9364 ObjCIvarDecl **ClsFields = 9365 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9366 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9367 ID->setEndOfDefinitionLoc(RBrac); 9368 // Add ivar's to class's DeclContext. 9369 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9370 ClsFields[i]->setLexicalDeclContext(ID); 9371 ID->addDecl(ClsFields[i]); 9372 } 9373 // Must enforce the rule that ivars in the base classes may not be 9374 // duplicates. 9375 if (ID->getSuperClass()) 9376 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9377 } else if (ObjCImplementationDecl *IMPDecl = 9378 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9379 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9380 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9381 // Ivar declared in @implementation never belongs to the implementation. 9382 // Only it is in implementation's lexical context. 9383 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9384 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9385 } else if (ObjCCategoryDecl *CDecl = 9386 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9387 // case of ivars in class extension; all other cases have been 9388 // reported as errors elsewhere. 9389 // FIXME. Class extension does not have a LocEnd field. 9390 // CDecl->setLocEnd(RBrac); 9391 // Add ivar's to class extension's DeclContext. 9392 // Diagnose redeclaration of private ivars. 9393 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9394 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9395 if (IDecl) { 9396 if (const ObjCIvarDecl *ClsIvar = 9397 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9398 Diag(ClsFields[i]->getLocation(), 9399 diag::err_duplicate_ivar_declaration); 9400 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9401 continue; 9402 } 9403 for (const ObjCCategoryDecl *ClsExtDecl = 9404 IDecl->getFirstClassExtension(); 9405 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9406 if (const ObjCIvarDecl *ClsExtIvar = 9407 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9408 Diag(ClsFields[i]->getLocation(), 9409 diag::err_duplicate_ivar_declaration); 9410 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9411 continue; 9412 } 9413 } 9414 } 9415 ClsFields[i]->setLexicalDeclContext(CDecl); 9416 CDecl->addDecl(ClsFields[i]); 9417 } 9418 } 9419 } 9420 9421 if (Attr) 9422 ProcessDeclAttributeList(S, Record, Attr); 9423 9424 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9425 // set the visibility of this record. 9426 if (Record && !Record->getDeclContext()->isRecord()) 9427 AddPushedVisibilityAttribute(Record); 9428} 9429 9430/// \brief Determine whether the given integral value is representable within 9431/// the given type T. 9432static bool isRepresentableIntegerValue(ASTContext &Context, 9433 llvm::APSInt &Value, 9434 QualType T) { 9435 assert(T->isIntegralType(Context) && "Integral type required!"); 9436 unsigned BitWidth = Context.getIntWidth(T); 9437 9438 if (Value.isUnsigned() || Value.isNonNegative()) { 9439 if (T->isSignedIntegerOrEnumerationType()) 9440 --BitWidth; 9441 return Value.getActiveBits() <= BitWidth; 9442 } 9443 return Value.getMinSignedBits() <= BitWidth; 9444} 9445 9446// \brief Given an integral type, return the next larger integral type 9447// (or a NULL type of no such type exists). 9448static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9449 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9450 // enum checking below. 9451 assert(T->isIntegralType(Context) && "Integral type required!"); 9452 const unsigned NumTypes = 4; 9453 QualType SignedIntegralTypes[NumTypes] = { 9454 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9455 }; 9456 QualType UnsignedIntegralTypes[NumTypes] = { 9457 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9458 Context.UnsignedLongLongTy 9459 }; 9460 9461 unsigned BitWidth = Context.getTypeSize(T); 9462 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9463 : UnsignedIntegralTypes; 9464 for (unsigned I = 0; I != NumTypes; ++I) 9465 if (Context.getTypeSize(Types[I]) > BitWidth) 9466 return Types[I]; 9467 9468 return QualType(); 9469} 9470 9471EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9472 EnumConstantDecl *LastEnumConst, 9473 SourceLocation IdLoc, 9474 IdentifierInfo *Id, 9475 Expr *Val) { 9476 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9477 llvm::APSInt EnumVal(IntWidth); 9478 QualType EltTy; 9479 9480 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9481 Val = 0; 9482 9483 if (Val) 9484 Val = DefaultLvalueConversion(Val).take(); 9485 9486 if (Val) { 9487 if (Enum->isDependentType() || Val->isTypeDependent()) 9488 EltTy = Context.DependentTy; 9489 else { 9490 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9491 SourceLocation ExpLoc; 9492 if (!Val->isValueDependent() && 9493 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9494 Val = 0; 9495 } else { 9496 if (!getLangOptions().CPlusPlus) { 9497 // C99 6.7.2.2p2: 9498 // The expression that defines the value of an enumeration constant 9499 // shall be an integer constant expression that has a value 9500 // representable as an int. 9501 9502 // Complain if the value is not representable in an int. 9503 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9504 Diag(IdLoc, diag::ext_enum_value_not_int) 9505 << EnumVal.toString(10) << Val->getSourceRange() 9506 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9507 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9508 // Force the type of the expression to 'int'. 9509 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9510 } 9511 } 9512 9513 if (Enum->isFixed()) { 9514 EltTy = Enum->getIntegerType(); 9515 9516 // C++0x [dcl.enum]p5: 9517 // ... if the initializing value of an enumerator cannot be 9518 // represented by the underlying type, the program is ill-formed. 9519 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9520 if (getLangOptions().MicrosoftExt) { 9521 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9522 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9523 } else 9524 Diag(IdLoc, diag::err_enumerator_too_large) 9525 << EltTy; 9526 } else 9527 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9528 } 9529 else { 9530 // C++0x [dcl.enum]p5: 9531 // If the underlying type is not fixed, the type of each enumerator 9532 // is the type of its initializing value: 9533 // - If an initializer is specified for an enumerator, the 9534 // initializing value has the same type as the expression. 9535 EltTy = Val->getType(); 9536 } 9537 } 9538 } 9539 } 9540 9541 if (!Val) { 9542 if (Enum->isDependentType()) 9543 EltTy = Context.DependentTy; 9544 else if (!LastEnumConst) { 9545 // C++0x [dcl.enum]p5: 9546 // If the underlying type is not fixed, the type of each enumerator 9547 // is the type of its initializing value: 9548 // - If no initializer is specified for the first enumerator, the 9549 // initializing value has an unspecified integral type. 9550 // 9551 // GCC uses 'int' for its unspecified integral type, as does 9552 // C99 6.7.2.2p3. 9553 if (Enum->isFixed()) { 9554 EltTy = Enum->getIntegerType(); 9555 } 9556 else { 9557 EltTy = Context.IntTy; 9558 } 9559 } else { 9560 // Assign the last value + 1. 9561 EnumVal = LastEnumConst->getInitVal(); 9562 ++EnumVal; 9563 EltTy = LastEnumConst->getType(); 9564 9565 // Check for overflow on increment. 9566 if (EnumVal < LastEnumConst->getInitVal()) { 9567 // C++0x [dcl.enum]p5: 9568 // If the underlying type is not fixed, the type of each enumerator 9569 // is the type of its initializing value: 9570 // 9571 // - Otherwise the type of the initializing value is the same as 9572 // the type of the initializing value of the preceding enumerator 9573 // unless the incremented value is not representable in that type, 9574 // in which case the type is an unspecified integral type 9575 // sufficient to contain the incremented value. If no such type 9576 // exists, the program is ill-formed. 9577 QualType T = getNextLargerIntegralType(Context, EltTy); 9578 if (T.isNull() || Enum->isFixed()) { 9579 // There is no integral type larger enough to represent this 9580 // value. Complain, then allow the value to wrap around. 9581 EnumVal = LastEnumConst->getInitVal(); 9582 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9583 ++EnumVal; 9584 if (Enum->isFixed()) 9585 // When the underlying type is fixed, this is ill-formed. 9586 Diag(IdLoc, diag::err_enumerator_wrapped) 9587 << EnumVal.toString(10) 9588 << EltTy; 9589 else 9590 Diag(IdLoc, diag::warn_enumerator_too_large) 9591 << EnumVal.toString(10); 9592 } else { 9593 EltTy = T; 9594 } 9595 9596 // Retrieve the last enumerator's value, extent that type to the 9597 // type that is supposed to be large enough to represent the incremented 9598 // value, then increment. 9599 EnumVal = LastEnumConst->getInitVal(); 9600 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9601 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9602 ++EnumVal; 9603 9604 // If we're not in C++, diagnose the overflow of enumerator values, 9605 // which in C99 means that the enumerator value is not representable in 9606 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9607 // permits enumerator values that are representable in some larger 9608 // integral type. 9609 if (!getLangOptions().CPlusPlus && !T.isNull()) 9610 Diag(IdLoc, diag::warn_enum_value_overflow); 9611 } else if (!getLangOptions().CPlusPlus && 9612 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9613 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9614 Diag(IdLoc, diag::ext_enum_value_not_int) 9615 << EnumVal.toString(10) << 1; 9616 } 9617 } 9618 } 9619 9620 if (!EltTy->isDependentType()) { 9621 // Make the enumerator value match the signedness and size of the 9622 // enumerator's type. 9623 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9624 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9625 } 9626 9627 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9628 Val, EnumVal); 9629} 9630 9631 9632Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9633 SourceLocation IdLoc, IdentifierInfo *Id, 9634 AttributeList *Attr, 9635 SourceLocation EqualLoc, Expr *val) { 9636 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9637 EnumConstantDecl *LastEnumConst = 9638 cast_or_null<EnumConstantDecl>(lastEnumConst); 9639 Expr *Val = static_cast<Expr*>(val); 9640 9641 // The scope passed in may not be a decl scope. Zip up the scope tree until 9642 // we find one that is. 9643 S = getNonFieldDeclScope(S); 9644 9645 // Verify that there isn't already something declared with this name in this 9646 // scope. 9647 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9648 ForRedeclaration); 9649 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9650 // Maybe we will complain about the shadowed template parameter. 9651 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9652 // Just pretend that we didn't see the previous declaration. 9653 PrevDecl = 0; 9654 } 9655 9656 if (PrevDecl) { 9657 // When in C++, we may get a TagDecl with the same name; in this case the 9658 // enum constant will 'hide' the tag. 9659 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9660 "Received TagDecl when not in C++!"); 9661 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9662 if (isa<EnumConstantDecl>(PrevDecl)) 9663 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9664 else 9665 Diag(IdLoc, diag::err_redefinition) << Id; 9666 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9667 return 0; 9668 } 9669 } 9670 9671 // C++ [class.mem]p13: 9672 // If T is the name of a class, then each of the following shall have a 9673 // name different from T: 9674 // - every enumerator of every member of class T that is an enumerated 9675 // type 9676 if (CXXRecordDecl *Record 9677 = dyn_cast<CXXRecordDecl>( 9678 TheEnumDecl->getDeclContext()->getRedeclContext())) 9679 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9680 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9681 9682 EnumConstantDecl *New = 9683 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9684 9685 if (New) { 9686 // Process attributes. 9687 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9688 9689 // Register this decl in the current scope stack. 9690 New->setAccess(TheEnumDecl->getAccess()); 9691 PushOnScopeChains(New, S); 9692 } 9693 9694 return New; 9695} 9696 9697void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9698 SourceLocation RBraceLoc, Decl *EnumDeclX, 9699 Decl **Elements, unsigned NumElements, 9700 Scope *S, AttributeList *Attr) { 9701 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9702 QualType EnumType = Context.getTypeDeclType(Enum); 9703 9704 if (Attr) 9705 ProcessDeclAttributeList(S, Enum, Attr); 9706 9707 if (Enum->isDependentType()) { 9708 for (unsigned i = 0; i != NumElements; ++i) { 9709 EnumConstantDecl *ECD = 9710 cast_or_null<EnumConstantDecl>(Elements[i]); 9711 if (!ECD) continue; 9712 9713 ECD->setType(EnumType); 9714 } 9715 9716 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9717 return; 9718 } 9719 9720 // TODO: If the result value doesn't fit in an int, it must be a long or long 9721 // long value. ISO C does not support this, but GCC does as an extension, 9722 // emit a warning. 9723 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9724 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9725 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9726 9727 // Verify that all the values are okay, compute the size of the values, and 9728 // reverse the list. 9729 unsigned NumNegativeBits = 0; 9730 unsigned NumPositiveBits = 0; 9731 9732 // Keep track of whether all elements have type int. 9733 bool AllElementsInt = true; 9734 9735 for (unsigned i = 0; i != NumElements; ++i) { 9736 EnumConstantDecl *ECD = 9737 cast_or_null<EnumConstantDecl>(Elements[i]); 9738 if (!ECD) continue; // Already issued a diagnostic. 9739 9740 const llvm::APSInt &InitVal = ECD->getInitVal(); 9741 9742 // Keep track of the size of positive and negative values. 9743 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9744 NumPositiveBits = std::max(NumPositiveBits, 9745 (unsigned)InitVal.getActiveBits()); 9746 else 9747 NumNegativeBits = std::max(NumNegativeBits, 9748 (unsigned)InitVal.getMinSignedBits()); 9749 9750 // Keep track of whether every enum element has type int (very commmon). 9751 if (AllElementsInt) 9752 AllElementsInt = ECD->getType() == Context.IntTy; 9753 } 9754 9755 // Figure out the type that should be used for this enum. 9756 QualType BestType; 9757 unsigned BestWidth; 9758 9759 // C++0x N3000 [conv.prom]p3: 9760 // An rvalue of an unscoped enumeration type whose underlying 9761 // type is not fixed can be converted to an rvalue of the first 9762 // of the following types that can represent all the values of 9763 // the enumeration: int, unsigned int, long int, unsigned long 9764 // int, long long int, or unsigned long long int. 9765 // C99 6.4.4.3p2: 9766 // An identifier declared as an enumeration constant has type int. 9767 // The C99 rule is modified by a gcc extension 9768 QualType BestPromotionType; 9769 9770 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9771 // -fshort-enums is the equivalent to specifying the packed attribute on all 9772 // enum definitions. 9773 if (LangOpts.ShortEnums) 9774 Packed = true; 9775 9776 if (Enum->isFixed()) { 9777 BestType = Enum->getIntegerType(); 9778 if (BestType->isPromotableIntegerType()) 9779 BestPromotionType = Context.getPromotedIntegerType(BestType); 9780 else 9781 BestPromotionType = BestType; 9782 // We don't need to set BestWidth, because BestType is going to be the type 9783 // of the enumerators, but we do anyway because otherwise some compilers 9784 // warn that it might be used uninitialized. 9785 BestWidth = CharWidth; 9786 } 9787 else if (NumNegativeBits) { 9788 // If there is a negative value, figure out the smallest integer type (of 9789 // int/long/longlong) that fits. 9790 // If it's packed, check also if it fits a char or a short. 9791 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9792 BestType = Context.SignedCharTy; 9793 BestWidth = CharWidth; 9794 } else if (Packed && NumNegativeBits <= ShortWidth && 9795 NumPositiveBits < ShortWidth) { 9796 BestType = Context.ShortTy; 9797 BestWidth = ShortWidth; 9798 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9799 BestType = Context.IntTy; 9800 BestWidth = IntWidth; 9801 } else { 9802 BestWidth = Context.getTargetInfo().getLongWidth(); 9803 9804 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9805 BestType = Context.LongTy; 9806 } else { 9807 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9808 9809 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9810 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9811 BestType = Context.LongLongTy; 9812 } 9813 } 9814 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9815 } else { 9816 // If there is no negative value, figure out the smallest type that fits 9817 // all of the enumerator values. 9818 // If it's packed, check also if it fits a char or a short. 9819 if (Packed && NumPositiveBits <= CharWidth) { 9820 BestType = Context.UnsignedCharTy; 9821 BestPromotionType = Context.IntTy; 9822 BestWidth = CharWidth; 9823 } else if (Packed && NumPositiveBits <= ShortWidth) { 9824 BestType = Context.UnsignedShortTy; 9825 BestPromotionType = Context.IntTy; 9826 BestWidth = ShortWidth; 9827 } else if (NumPositiveBits <= IntWidth) { 9828 BestType = Context.UnsignedIntTy; 9829 BestWidth = IntWidth; 9830 BestPromotionType 9831 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9832 ? Context.UnsignedIntTy : Context.IntTy; 9833 } else if (NumPositiveBits <= 9834 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9835 BestType = Context.UnsignedLongTy; 9836 BestPromotionType 9837 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9838 ? Context.UnsignedLongTy : Context.LongTy; 9839 } else { 9840 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9841 assert(NumPositiveBits <= BestWidth && 9842 "How could an initializer get larger than ULL?"); 9843 BestType = Context.UnsignedLongLongTy; 9844 BestPromotionType 9845 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9846 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9847 } 9848 } 9849 9850 // Loop over all of the enumerator constants, changing their types to match 9851 // the type of the enum if needed. 9852 for (unsigned i = 0; i != NumElements; ++i) { 9853 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9854 if (!ECD) continue; // Already issued a diagnostic. 9855 9856 // Standard C says the enumerators have int type, but we allow, as an 9857 // extension, the enumerators to be larger than int size. If each 9858 // enumerator value fits in an int, type it as an int, otherwise type it the 9859 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9860 // that X has type 'int', not 'unsigned'. 9861 9862 // Determine whether the value fits into an int. 9863 llvm::APSInt InitVal = ECD->getInitVal(); 9864 9865 // If it fits into an integer type, force it. Otherwise force it to match 9866 // the enum decl type. 9867 QualType NewTy; 9868 unsigned NewWidth; 9869 bool NewSign; 9870 if (!getLangOptions().CPlusPlus && 9871 !Enum->isFixed() && 9872 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9873 NewTy = Context.IntTy; 9874 NewWidth = IntWidth; 9875 NewSign = true; 9876 } else if (ECD->getType() == BestType) { 9877 // Already the right type! 9878 if (getLangOptions().CPlusPlus) 9879 // C++ [dcl.enum]p4: Following the closing brace of an 9880 // enum-specifier, each enumerator has the type of its 9881 // enumeration. 9882 ECD->setType(EnumType); 9883 continue; 9884 } else { 9885 NewTy = BestType; 9886 NewWidth = BestWidth; 9887 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9888 } 9889 9890 // Adjust the APSInt value. 9891 InitVal = InitVal.extOrTrunc(NewWidth); 9892 InitVal.setIsSigned(NewSign); 9893 ECD->setInitVal(InitVal); 9894 9895 // Adjust the Expr initializer and type. 9896 if (ECD->getInitExpr() && 9897 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9898 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9899 CK_IntegralCast, 9900 ECD->getInitExpr(), 9901 /*base paths*/ 0, 9902 VK_RValue)); 9903 if (getLangOptions().CPlusPlus) 9904 // C++ [dcl.enum]p4: Following the closing brace of an 9905 // enum-specifier, each enumerator has the type of its 9906 // enumeration. 9907 ECD->setType(EnumType); 9908 else 9909 ECD->setType(NewTy); 9910 } 9911 9912 Enum->completeDefinition(BestType, BestPromotionType, 9913 NumPositiveBits, NumNegativeBits); 9914} 9915 9916Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9917 SourceLocation StartLoc, 9918 SourceLocation EndLoc) { 9919 StringLiteral *AsmString = cast<StringLiteral>(expr); 9920 9921 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9922 AsmString, StartLoc, 9923 EndLoc); 9924 CurContext->addDecl(New); 9925 return New; 9926} 9927 9928DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 9929 SourceLocation ImportLoc, 9930 ModuleIdPath Path) { 9931 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9932 Module::AllVisible, 9933 /*IsIncludeDirective=*/false); 9934 if (!Mod) 9935 return true; 9936 9937 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9938 Module *ModCheck = Mod; 9939 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9940 // If we've run out of module parents, just drop the remaining identifiers. 9941 // We need the length to be consistent. 9942 if (!ModCheck) 9943 break; 9944 ModCheck = ModCheck->Parent; 9945 9946 IdentifierLocs.push_back(Path[I].second); 9947 } 9948 9949 ImportDecl *Import = ImportDecl::Create(Context, 9950 Context.getTranslationUnitDecl(), 9951 AtLoc.isValid()? AtLoc : ImportLoc, 9952 Mod, IdentifierLocs); 9953 Context.getTranslationUnitDecl()->addDecl(Import); 9954 return Import; 9955} 9956 9957void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9958 SourceLocation PragmaLoc, 9959 SourceLocation NameLoc) { 9960 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9961 9962 if (PrevDecl) { 9963 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9964 } else { 9965 (void)WeakUndeclaredIdentifiers.insert( 9966 std::pair<IdentifierInfo*,WeakInfo> 9967 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9968 } 9969} 9970 9971void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9972 IdentifierInfo* AliasName, 9973 SourceLocation PragmaLoc, 9974 SourceLocation NameLoc, 9975 SourceLocation AliasNameLoc) { 9976 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9977 LookupOrdinaryName); 9978 WeakInfo W = WeakInfo(Name, NameLoc); 9979 9980 if (PrevDecl) { 9981 if (!PrevDecl->hasAttr<AliasAttr>()) 9982 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9983 DeclApplyPragmaWeak(TUScope, ND, W); 9984 } else { 9985 (void)WeakUndeclaredIdentifiers.insert( 9986 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9987 } 9988} 9989 9990Decl *Sema::getObjCDeclContext() const { 9991 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9992} 9993 9994AvailabilityResult Sema::getCurContextAvailability() const { 9995 const Decl *D = cast<Decl>(getCurLexicalContext()); 9996 // A category implicitly has the availability of the interface. 9997 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9998 D = CatD->getClassInterface(); 9999 10000 return D->getAvailability(); 10001} 10002