SemaDecl.cpp revision 27c6da284f90e32cda0ec8f52a2b6ba5a2613252
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo, 74 IdentifierInfo **CorrectedII) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 if (CorrectedII) { 150 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 151 Kind, S, SS, 0, false, 152 Sema::CTC_Type); 153 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 154 TemplateTy Template; 155 bool MemberOfUnknownSpecialization; 156 UnqualifiedId TemplateName; 157 TemplateName.setIdentifier(NewII, NameLoc); 158 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 159 CXXScopeSpec NewSS, *NewSSPtr = SS; 160 if (SS && NNS) { 161 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 162 NewSSPtr = &NewSS; 163 } 164 if (Correction && (NNS || NewII != &II) && 165 // Ignore a correction to a template type as the to-be-corrected 166 // identifier is not a template (typo correction for template names 167 // is handled elsewhere). 168 !(getLangOptions().CPlusPlus && NewSSPtr && 169 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 170 false, Template, MemberOfUnknownSpecialization))) { 171 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 172 isClassName, HasTrailingDot, ObjectTypePtr, 173 WantNontrivialTypeSourceInfo); 174 if (Ty) { 175 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 176 std::string CorrectedQuotedStr( 177 Correction.getQuoted(getLangOptions())); 178 Diag(NameLoc, diag::err_unknown_typename_suggest) 179 << Result.getLookupName() << CorrectedQuotedStr 180 << FixItHint::CreateReplacement(SourceRange(NameLoc), 181 CorrectedStr); 182 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 183 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 184 << CorrectedQuotedStr; 185 186 if (SS && NNS) 187 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 *CorrectedII = NewII; 189 return Ty; 190 } 191 } 192 } 193 // If typo correction failed or was not performed, fall through 194 case LookupResult::FoundOverloaded: 195 case LookupResult::FoundUnresolvedValue: 196 Result.suppressDiagnostics(); 197 return ParsedType(); 198 199 case LookupResult::Ambiguous: 200 // Recover from type-hiding ambiguities by hiding the type. We'll 201 // do the lookup again when looking for an object, and we can 202 // diagnose the error then. If we don't do this, then the error 203 // about hiding the type will be immediately followed by an error 204 // that only makes sense if the identifier was treated like a type. 205 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 206 Result.suppressDiagnostics(); 207 return ParsedType(); 208 } 209 210 // Look to see if we have a type anywhere in the list of results. 211 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 212 Res != ResEnd; ++Res) { 213 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 214 if (!IIDecl || 215 (*Res)->getLocation().getRawEncoding() < 216 IIDecl->getLocation().getRawEncoding()) 217 IIDecl = *Res; 218 } 219 } 220 221 if (!IIDecl) { 222 // None of the entities we found is a type, so there is no way 223 // to even assume that the result is a type. In this case, don't 224 // complain about the ambiguity. The parser will either try to 225 // perform this lookup again (e.g., as an object name), which 226 // will produce the ambiguity, or will complain that it expected 227 // a type name. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 232 // We found a type within the ambiguous lookup; diagnose the 233 // ambiguity and then return that type. This might be the right 234 // answer, or it might not be, but it suppresses any attempt to 235 // perform the name lookup again. 236 break; 237 238 case LookupResult::Found: 239 IIDecl = Result.getFoundDecl(); 240 break; 241 } 242 243 assert(IIDecl && "Didn't find decl"); 244 245 QualType T; 246 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 247 DiagnoseUseOfDecl(IIDecl, NameLoc); 248 249 if (T.isNull()) 250 T = Context.getTypeDeclType(TD); 251 252 if (SS && SS->isNotEmpty()) { 253 if (WantNontrivialTypeSourceInfo) { 254 // Construct a type with type-source information. 255 TypeLocBuilder Builder; 256 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 257 258 T = getElaboratedType(ETK_None, *SS, T); 259 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 260 ElabTL.setKeywordLoc(SourceLocation()); 261 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 262 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 263 } else { 264 T = getElaboratedType(ETK_None, *SS, T); 265 } 266 } 267 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 268 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 269 if (!HasTrailingDot) 270 T = Context.getObjCInterfaceType(IDecl); 271 } 272 273 if (T.isNull()) { 274 // If it's not plausibly a type, suppress diagnostics. 275 Result.suppressDiagnostics(); 276 return ParsedType(); 277 } 278 return ParsedType::make(T); 279} 280 281/// isTagName() - This method is called *for error recovery purposes only* 282/// to determine if the specified name is a valid tag name ("struct foo"). If 283/// so, this returns the TST for the tag corresponding to it (TST_enum, 284/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 285/// where the user forgot to specify the tag. 286DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 287 // Do a tag name lookup in this scope. 288 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 289 LookupName(R, S, false); 290 R.suppressDiagnostics(); 291 if (R.getResultKind() == LookupResult::Found) 292 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 293 switch (TD->getTagKind()) { 294 default: return DeclSpec::TST_unspecified; 295 case TTK_Struct: return DeclSpec::TST_struct; 296 case TTK_Union: return DeclSpec::TST_union; 297 case TTK_Class: return DeclSpec::TST_class; 298 case TTK_Enum: return DeclSpec::TST_enum; 299 } 300 } 301 302 return DeclSpec::TST_unspecified; 303} 304 305/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 306/// if a CXXScopeSpec's type is equal to the type of one of the base classes 307/// then downgrade the missing typename error to a warning. 308/// This is needed for MSVC compatibility; Example: 309/// @code 310/// template<class T> class A { 311/// public: 312/// typedef int TYPE; 313/// }; 314/// template<class T> class B : public A<T> { 315/// public: 316/// A<T>::TYPE a; // no typename required because A<T> is a base class. 317/// }; 318/// @endcode 319bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 320 if (CurContext->isRecord()) { 321 const Type *Ty = SS->getScopeRep()->getAsType(); 322 323 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 324 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 325 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 326 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 327 return true; 328 return S->isFunctionPrototypeScope(); 329 } 330 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 331} 332 333bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 334 SourceLocation IILoc, 335 Scope *S, 336 CXXScopeSpec *SS, 337 ParsedType &SuggestedType) { 338 // We don't have anything to suggest (yet). 339 SuggestedType = ParsedType(); 340 341 // There may have been a typo in the name of the type. Look up typo 342 // results, in case we have something that we can suggest. 343 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 344 LookupOrdinaryName, S, SS, NULL, 345 false, CTC_Type)) { 346 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 347 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 348 349 if (Corrected.isKeyword()) { 350 // We corrected to a keyword. 351 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 352 Diag(IILoc, diag::err_unknown_typename_suggest) 353 << &II << CorrectedQuotedStr; 354 return true; 355 } else { 356 NamedDecl *Result = Corrected.getCorrectionDecl(); 357 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 358 !Result->isInvalidDecl()) { 359 // We found a similarly-named type or interface; suggest that. 360 if (!SS || !SS->isSet()) 361 Diag(IILoc, diag::err_unknown_typename_suggest) 362 << &II << CorrectedQuotedStr 363 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 364 else if (DeclContext *DC = computeDeclContext(*SS, false)) 365 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 366 << &II << DC << CorrectedQuotedStr << SS->getRange() 367 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 368 else 369 llvm_unreachable("could not have corrected a typo here"); 370 371 Diag(Result->getLocation(), diag::note_previous_decl) 372 << CorrectedQuotedStr; 373 374 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 375 false, false, ParsedType(), 376 /*NonTrivialTypeSourceInfo=*/true); 377 return true; 378 } 379 } 380 } 381 382 if (getLangOptions().CPlusPlus) { 383 // See if II is a class template that the user forgot to pass arguments to. 384 UnqualifiedId Name; 385 Name.setIdentifier(&II, IILoc); 386 CXXScopeSpec EmptySS; 387 TemplateTy TemplateResult; 388 bool MemberOfUnknownSpecialization; 389 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 390 Name, ParsedType(), true, TemplateResult, 391 MemberOfUnknownSpecialization) == TNK_Type_template) { 392 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 393 Diag(IILoc, diag::err_template_missing_args) << TplName; 394 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 395 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 396 << TplDecl->getTemplateParameters()->getSourceRange(); 397 } 398 return true; 399 } 400 } 401 402 // FIXME: Should we move the logic that tries to recover from a missing tag 403 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 404 405 if (!SS || (!SS->isSet() && !SS->isInvalid())) 406 Diag(IILoc, diag::err_unknown_typename) << &II; 407 else if (DeclContext *DC = computeDeclContext(*SS, false)) 408 Diag(IILoc, diag::err_typename_nested_not_found) 409 << &II << DC << SS->getRange(); 410 else if (isDependentScopeSpecifier(*SS)) { 411 unsigned DiagID = diag::err_typename_missing; 412 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 413 DiagID = diag::warn_typename_missing; 414 415 Diag(SS->getRange().getBegin(), DiagID) 416 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 417 << SourceRange(SS->getRange().getBegin(), IILoc) 418 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 419 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 420 .get(); 421 } else { 422 assert(SS && SS->isInvalid() && 423 "Invalid scope specifier has already been diagnosed"); 424 } 425 426 return true; 427} 428 429/// \brief Determine whether the given result set contains either a type name 430/// or 431static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 433 NextToken.is(tok::less); 434 435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 437 return true; 438 439 if (CheckTemplate && isa<TemplateDecl>(*I)) 440 return true; 441 } 442 443 return false; 444} 445 446Sema::NameClassification Sema::ClassifyName(Scope *S, 447 CXXScopeSpec &SS, 448 IdentifierInfo *&Name, 449 SourceLocation NameLoc, 450 const Token &NextToken) { 451 DeclarationNameInfo NameInfo(Name, NameLoc); 452 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 453 454 if (NextToken.is(tok::coloncolon)) { 455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 456 QualType(), false, SS, 0, false); 457 458 } 459 460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 461 LookupParsedName(Result, S, &SS, !CurMethod); 462 463 // Perform lookup for Objective-C instance variables (including automatically 464 // synthesized instance variables), if we're in an Objective-C method. 465 // FIXME: This lookup really, really needs to be folded in to the normal 466 // unqualified lookup mechanism. 467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 468 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 469 if (E.get() || E.isInvalid()) 470 return E; 471 } 472 473 bool SecondTry = false; 474 bool IsFilteredTemplateName = false; 475 476Corrected: 477 switch (Result.getResultKind()) { 478 case LookupResult::NotFound: 479 // If an unqualified-id is followed by a '(', then we have a function 480 // call. 481 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 482 // In C++, this is an ADL-only call. 483 // FIXME: Reference? 484 if (getLangOptions().CPlusPlus) 485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 486 487 // C90 6.3.2.2: 488 // If the expression that precedes the parenthesized argument list in a 489 // function call consists solely of an identifier, and if no 490 // declaration is visible for this identifier, the identifier is 491 // implicitly declared exactly as if, in the innermost block containing 492 // the function call, the declaration 493 // 494 // extern int identifier (); 495 // 496 // appeared. 497 // 498 // We also allow this in C99 as an extension. 499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 500 Result.addDecl(D); 501 Result.resolveKind(); 502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 503 } 504 } 505 506 // In C, we first see whether there is a tag type by the same name, in 507 // which case it's likely that the user just forget to write "enum", 508 // "struct", or "union". 509 if (!getLangOptions().CPlusPlus && !SecondTry) { 510 Result.clear(LookupTagName); 511 LookupParsedName(Result, S, &SS); 512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 513 const char *TagName = 0; 514 const char *FixItTagName = 0; 515 switch (Tag->getTagKind()) { 516 case TTK_Class: 517 TagName = "class"; 518 FixItTagName = "class "; 519 break; 520 521 case TTK_Enum: 522 TagName = "enum"; 523 FixItTagName = "enum "; 524 break; 525 526 case TTK_Struct: 527 TagName = "struct"; 528 FixItTagName = "struct "; 529 break; 530 531 case TTK_Union: 532 TagName = "union"; 533 FixItTagName = "union "; 534 break; 535 } 536 537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 538 << Name << TagName << getLangOptions().CPlusPlus 539 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 540 break; 541 } 542 543 Result.clear(LookupOrdinaryName); 544 } 545 546 // Perform typo correction to determine if there is another name that is 547 // close to this name. 548 if (!SecondTry) { 549 SecondTry = true; 550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 551 Result.getLookupKind(), S, 552 &SS)) { 553 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 554 unsigned QualifiedDiag = diag::err_no_member_suggest; 555 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 556 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 557 558 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 559 NamedDecl *UnderlyingFirstDecl 560 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 561 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 562 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 563 UnqualifiedDiag = diag::err_no_template_suggest; 564 QualifiedDiag = diag::err_no_member_template_suggest; 565 } else if (UnderlyingFirstDecl && 566 (isa<TypeDecl>(UnderlyingFirstDecl) || 567 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 568 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 569 UnqualifiedDiag = diag::err_unknown_typename_suggest; 570 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 571 } 572 573 if (SS.isEmpty()) 574 Diag(NameLoc, UnqualifiedDiag) 575 << Name << CorrectedQuotedStr 576 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 577 else 578 Diag(NameLoc, QualifiedDiag) 579 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 580 << SS.getRange() 581 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 582 583 // Update the name, so that the caller has the new name. 584 Name = Corrected.getCorrectionAsIdentifierInfo(); 585 586 // Also update the LookupResult... 587 // FIXME: This should probably go away at some point 588 Result.clear(); 589 Result.setLookupName(Corrected.getCorrection()); 590 if (FirstDecl) Result.addDecl(FirstDecl); 591 592 // Typo correction corrected to a keyword. 593 if (Corrected.isKeyword()) 594 return Corrected.getCorrectionAsIdentifierInfo(); 595 596 if (FirstDecl) 597 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 598 << CorrectedQuotedStr; 599 600 // If we found an Objective-C instance variable, let 601 // LookupInObjCMethod build the appropriate expression to 602 // reference the ivar. 603 // FIXME: This is a gross hack. 604 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 605 Result.clear(); 606 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 607 return move(E); 608 } 609 610 goto Corrected; 611 } 612 } 613 614 // We failed to correct; just fall through and let the parser deal with it. 615 Result.suppressDiagnostics(); 616 return NameClassification::Unknown(); 617 618 case LookupResult::NotFoundInCurrentInstantiation: 619 // We performed name lookup into the current instantiation, and there were 620 // dependent bases, so we treat this result the same way as any other 621 // dependent nested-name-specifier. 622 623 // C++ [temp.res]p2: 624 // A name used in a template declaration or definition and that is 625 // dependent on a template-parameter is assumed not to name a type 626 // unless the applicable name lookup finds a type name or the name is 627 // qualified by the keyword typename. 628 // 629 // FIXME: If the next token is '<', we might want to ask the parser to 630 // perform some heroics to see if we actually have a 631 // template-argument-list, which would indicate a missing 'template' 632 // keyword here. 633 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 634 635 case LookupResult::Found: 636 case LookupResult::FoundOverloaded: 637 case LookupResult::FoundUnresolvedValue: 638 break; 639 640 case LookupResult::Ambiguous: 641 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 642 hasAnyAcceptableTemplateNames(Result)) { 643 // C++ [temp.local]p3: 644 // A lookup that finds an injected-class-name (10.2) can result in an 645 // ambiguity in certain cases (for example, if it is found in more than 646 // one base class). If all of the injected-class-names that are found 647 // refer to specializations of the same class template, and if the name 648 // is followed by a template-argument-list, the reference refers to the 649 // class template itself and not a specialization thereof, and is not 650 // ambiguous. 651 // 652 // This filtering can make an ambiguous result into an unambiguous one, 653 // so try again after filtering out template names. 654 FilterAcceptableTemplateNames(Result); 655 if (!Result.isAmbiguous()) { 656 IsFilteredTemplateName = true; 657 break; 658 } 659 } 660 661 // Diagnose the ambiguity and return an error. 662 return NameClassification::Error(); 663 } 664 665 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 666 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 667 // C++ [temp.names]p3: 668 // After name lookup (3.4) finds that a name is a template-name or that 669 // an operator-function-id or a literal- operator-id refers to a set of 670 // overloaded functions any member of which is a function template if 671 // this is followed by a <, the < is always taken as the delimiter of a 672 // template-argument-list and never as the less-than operator. 673 if (!IsFilteredTemplateName) 674 FilterAcceptableTemplateNames(Result); 675 676 if (!Result.empty()) { 677 bool IsFunctionTemplate; 678 TemplateName Template; 679 if (Result.end() - Result.begin() > 1) { 680 IsFunctionTemplate = true; 681 Template = Context.getOverloadedTemplateName(Result.begin(), 682 Result.end()); 683 } else { 684 TemplateDecl *TD 685 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 686 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 687 688 if (SS.isSet() && !SS.isInvalid()) 689 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 690 /*TemplateKeyword=*/false, 691 TD); 692 else 693 Template = TemplateName(TD); 694 } 695 696 if (IsFunctionTemplate) { 697 // Function templates always go through overload resolution, at which 698 // point we'll perform the various checks (e.g., accessibility) we need 699 // to based on which function we selected. 700 Result.suppressDiagnostics(); 701 702 return NameClassification::FunctionTemplate(Template); 703 } 704 705 return NameClassification::TypeTemplate(Template); 706 } 707 } 708 709 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 710 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 711 DiagnoseUseOfDecl(Type, NameLoc); 712 QualType T = Context.getTypeDeclType(Type); 713 return ParsedType::make(T); 714 } 715 716 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 717 if (!Class) { 718 // FIXME: It's unfortunate that we don't have a Type node for handling this. 719 if (ObjCCompatibleAliasDecl *Alias 720 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 721 Class = Alias->getClassInterface(); 722 } 723 724 if (Class) { 725 DiagnoseUseOfDecl(Class, NameLoc); 726 727 if (NextToken.is(tok::period)) { 728 // Interface. <something> is parsed as a property reference expression. 729 // Just return "unknown" as a fall-through for now. 730 Result.suppressDiagnostics(); 731 return NameClassification::Unknown(); 732 } 733 734 QualType T = Context.getObjCInterfaceType(Class); 735 return ParsedType::make(T); 736 } 737 738 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 739 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 740 741 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 742 return BuildDeclarationNameExpr(SS, Result, ADL); 743} 744 745// Determines the context to return to after temporarily entering a 746// context. This depends in an unnecessarily complicated way on the 747// exact ordering of callbacks from the parser. 748DeclContext *Sema::getContainingDC(DeclContext *DC) { 749 750 // Functions defined inline within classes aren't parsed until we've 751 // finished parsing the top-level class, so the top-level class is 752 // the context we'll need to return to. 753 if (isa<FunctionDecl>(DC)) { 754 DC = DC->getLexicalParent(); 755 756 // A function not defined within a class will always return to its 757 // lexical context. 758 if (!isa<CXXRecordDecl>(DC)) 759 return DC; 760 761 // A C++ inline method/friend is parsed *after* the topmost class 762 // it was declared in is fully parsed ("complete"); the topmost 763 // class is the context we need to return to. 764 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 765 DC = RD; 766 767 // Return the declaration context of the topmost class the inline method is 768 // declared in. 769 return DC; 770 } 771 772 return DC->getLexicalParent(); 773} 774 775void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 776 assert(getContainingDC(DC) == CurContext && 777 "The next DeclContext should be lexically contained in the current one."); 778 CurContext = DC; 779 S->setEntity(DC); 780} 781 782void Sema::PopDeclContext() { 783 assert(CurContext && "DeclContext imbalance!"); 784 785 CurContext = getContainingDC(CurContext); 786 assert(CurContext && "Popped translation unit!"); 787} 788 789/// EnterDeclaratorContext - Used when we must lookup names in the context 790/// of a declarator's nested name specifier. 791/// 792void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 793 // C++0x [basic.lookup.unqual]p13: 794 // A name used in the definition of a static data member of class 795 // X (after the qualified-id of the static member) is looked up as 796 // if the name was used in a member function of X. 797 // C++0x [basic.lookup.unqual]p14: 798 // If a variable member of a namespace is defined outside of the 799 // scope of its namespace then any name used in the definition of 800 // the variable member (after the declarator-id) is looked up as 801 // if the definition of the variable member occurred in its 802 // namespace. 803 // Both of these imply that we should push a scope whose context 804 // is the semantic context of the declaration. We can't use 805 // PushDeclContext here because that context is not necessarily 806 // lexically contained in the current context. Fortunately, 807 // the containing scope should have the appropriate information. 808 809 assert(!S->getEntity() && "scope already has entity"); 810 811#ifndef NDEBUG 812 Scope *Ancestor = S->getParent(); 813 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 814 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 815#endif 816 817 CurContext = DC; 818 S->setEntity(DC); 819} 820 821void Sema::ExitDeclaratorContext(Scope *S) { 822 assert(S->getEntity() == CurContext && "Context imbalance!"); 823 824 // Switch back to the lexical context. The safety of this is 825 // enforced by an assert in EnterDeclaratorContext. 826 Scope *Ancestor = S->getParent(); 827 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 828 CurContext = (DeclContext*) Ancestor->getEntity(); 829 830 // We don't need to do anything with the scope, which is going to 831 // disappear. 832} 833 834 835void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 836 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 837 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 838 // We assume that the caller has already called 839 // ActOnReenterTemplateScope 840 FD = TFD->getTemplatedDecl(); 841 } 842 if (!FD) 843 return; 844 845 PushDeclContext(S, FD); 846 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 847 ParmVarDecl *Param = FD->getParamDecl(P); 848 // If the parameter has an identifier, then add it to the scope 849 if (Param->getIdentifier()) { 850 S->AddDecl(Param); 851 IdResolver.AddDecl(Param); 852 } 853 } 854} 855 856 857/// \brief Determine whether we allow overloading of the function 858/// PrevDecl with another declaration. 859/// 860/// This routine determines whether overloading is possible, not 861/// whether some new function is actually an overload. It will return 862/// true in C++ (where we can always provide overloads) or, as an 863/// extension, in C when the previous function is already an 864/// overloaded function declaration or has the "overloadable" 865/// attribute. 866static bool AllowOverloadingOfFunction(LookupResult &Previous, 867 ASTContext &Context) { 868 if (Context.getLangOptions().CPlusPlus) 869 return true; 870 871 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 872 return true; 873 874 return (Previous.getResultKind() == LookupResult::Found 875 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 876} 877 878/// Add this decl to the scope shadowed decl chains. 879void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 880 // Move up the scope chain until we find the nearest enclosing 881 // non-transparent context. The declaration will be introduced into this 882 // scope. 883 while (S->getEntity() && 884 ((DeclContext *)S->getEntity())->isTransparentContext()) 885 S = S->getParent(); 886 887 // Add scoped declarations into their context, so that they can be 888 // found later. Declarations without a context won't be inserted 889 // into any context. 890 if (AddToContext) 891 CurContext->addDecl(D); 892 893 // Out-of-line definitions shouldn't be pushed into scope in C++. 894 // Out-of-line variable and function definitions shouldn't even in C. 895 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 896 D->isOutOfLine() && 897 !D->getDeclContext()->getRedeclContext()->Equals( 898 D->getLexicalDeclContext()->getRedeclContext())) 899 return; 900 901 // Template instantiations should also not be pushed into scope. 902 if (isa<FunctionDecl>(D) && 903 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 904 return; 905 906 // If this replaces anything in the current scope, 907 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 908 IEnd = IdResolver.end(); 909 for (; I != IEnd; ++I) { 910 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 911 S->RemoveDecl(*I); 912 IdResolver.RemoveDecl(*I); 913 914 // Should only need to replace one decl. 915 break; 916 } 917 } 918 919 S->AddDecl(D); 920 921 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 922 // Implicitly-generated labels may end up getting generated in an order that 923 // isn't strictly lexical, which breaks name lookup. Be careful to insert 924 // the label at the appropriate place in the identifier chain. 925 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 926 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 927 if (IDC == CurContext) { 928 if (!S->isDeclScope(*I)) 929 continue; 930 } else if (IDC->Encloses(CurContext)) 931 break; 932 } 933 934 IdResolver.InsertDeclAfter(I, D); 935 } else { 936 IdResolver.AddDecl(D); 937 } 938} 939 940void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 941 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 942 TUScope->AddDecl(D); 943} 944 945bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 946 bool ExplicitInstantiationOrSpecialization) { 947 return IdResolver.isDeclInScope(D, Ctx, Context, S, 948 ExplicitInstantiationOrSpecialization); 949} 950 951Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 952 DeclContext *TargetDC = DC->getPrimaryContext(); 953 do { 954 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 955 if (ScopeDC->getPrimaryContext() == TargetDC) 956 return S; 957 } while ((S = S->getParent())); 958 959 return 0; 960} 961 962static bool isOutOfScopePreviousDeclaration(NamedDecl *, 963 DeclContext*, 964 ASTContext&); 965 966/// Filters out lookup results that don't fall within the given scope 967/// as determined by isDeclInScope. 968void Sema::FilterLookupForScope(LookupResult &R, 969 DeclContext *Ctx, Scope *S, 970 bool ConsiderLinkage, 971 bool ExplicitInstantiationOrSpecialization) { 972 LookupResult::Filter F = R.makeFilter(); 973 while (F.hasNext()) { 974 NamedDecl *D = F.next(); 975 976 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 977 continue; 978 979 if (ConsiderLinkage && 980 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 981 continue; 982 983 F.erase(); 984 } 985 986 F.done(); 987} 988 989static bool isUsingDecl(NamedDecl *D) { 990 return isa<UsingShadowDecl>(D) || 991 isa<UnresolvedUsingTypenameDecl>(D) || 992 isa<UnresolvedUsingValueDecl>(D); 993} 994 995/// Removes using shadow declarations from the lookup results. 996static void RemoveUsingDecls(LookupResult &R) { 997 LookupResult::Filter F = R.makeFilter(); 998 while (F.hasNext()) 999 if (isUsingDecl(F.next())) 1000 F.erase(); 1001 1002 F.done(); 1003} 1004 1005/// \brief Check for this common pattern: 1006/// @code 1007/// class S { 1008/// S(const S&); // DO NOT IMPLEMENT 1009/// void operator=(const S&); // DO NOT IMPLEMENT 1010/// }; 1011/// @endcode 1012static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1013 // FIXME: Should check for private access too but access is set after we get 1014 // the decl here. 1015 if (D->doesThisDeclarationHaveABody()) 1016 return false; 1017 1018 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1019 return CD->isCopyConstructor(); 1020 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1021 return Method->isCopyAssignmentOperator(); 1022 return false; 1023} 1024 1025bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1026 assert(D); 1027 1028 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1029 return false; 1030 1031 // Ignore class templates. 1032 if (D->getDeclContext()->isDependentContext() || 1033 D->getLexicalDeclContext()->isDependentContext()) 1034 return false; 1035 1036 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1037 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1038 return false; 1039 1040 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1041 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1042 return false; 1043 } else { 1044 // 'static inline' functions are used in headers; don't warn. 1045 if (FD->getStorageClass() == SC_Static && 1046 FD->isInlineSpecified()) 1047 return false; 1048 } 1049 1050 if (FD->doesThisDeclarationHaveABody() && 1051 Context.DeclMustBeEmitted(FD)) 1052 return false; 1053 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1054 if (!VD->isFileVarDecl() || 1055 VD->getType().isConstant(Context) || 1056 Context.DeclMustBeEmitted(VD)) 1057 return false; 1058 1059 if (VD->isStaticDataMember() && 1060 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1061 return false; 1062 1063 } else { 1064 return false; 1065 } 1066 1067 // Only warn for unused decls internal to the translation unit. 1068 if (D->getLinkage() == ExternalLinkage) 1069 return false; 1070 1071 return true; 1072} 1073 1074void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1075 if (!D) 1076 return; 1077 1078 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1079 const FunctionDecl *First = FD->getFirstDeclaration(); 1080 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1085 const VarDecl *First = VD->getFirstDeclaration(); 1086 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1087 return; // First should already be in the vector. 1088 } 1089 1090 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1091 UnusedFileScopedDecls.push_back(D); 1092 } 1093 1094static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1095 if (D->isInvalidDecl()) 1096 return false; 1097 1098 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1099 return false; 1100 1101 if (isa<LabelDecl>(D)) 1102 return true; 1103 1104 // White-list anything that isn't a local variable. 1105 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1106 !D->getDeclContext()->isFunctionOrMethod()) 1107 return false; 1108 1109 // Types of valid local variables should be complete, so this should succeed. 1110 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1111 1112 // White-list anything with an __attribute__((unused)) type. 1113 QualType Ty = VD->getType(); 1114 1115 // Only look at the outermost level of typedef. 1116 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1117 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1118 return false; 1119 } 1120 1121 // If we failed to complete the type for some reason, or if the type is 1122 // dependent, don't diagnose the variable. 1123 if (Ty->isIncompleteType() || Ty->isDependentType()) 1124 return false; 1125 1126 if (const TagType *TT = Ty->getAs<TagType>()) { 1127 const TagDecl *Tag = TT->getDecl(); 1128 if (Tag->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1132 // FIXME: Checking for the presence of a user-declared constructor 1133 // isn't completely accurate; we'd prefer to check that the initializer 1134 // has no side effects. 1135 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1136 return false; 1137 } 1138 } 1139 1140 // TODO: __attribute__((unused)) templates? 1141 } 1142 1143 return true; 1144} 1145 1146static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1147 FixItHint &Hint) { 1148 if (isa<LabelDecl>(D)) { 1149 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1150 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1151 if (AfterColon.isInvalid()) 1152 return; 1153 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1154 getCharRange(D->getLocStart(), AfterColon)); 1155 } 1156 return; 1157} 1158 1159/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1160/// unless they are marked attr(unused). 1161void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1162 FixItHint Hint; 1163 if (!ShouldDiagnoseUnusedDecl(D)) 1164 return; 1165 1166 GenerateFixForUnusedDecl(D, Context, Hint); 1167 1168 unsigned DiagID; 1169 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1170 DiagID = diag::warn_unused_exception_param; 1171 else if (isa<LabelDecl>(D)) 1172 DiagID = diag::warn_unused_label; 1173 else 1174 DiagID = diag::warn_unused_variable; 1175 1176 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1177} 1178 1179static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1180 // Verify that we have no forward references left. If so, there was a goto 1181 // or address of a label taken, but no definition of it. Label fwd 1182 // definitions are indicated with a null substmt. 1183 if (L->getStmt() == 0) 1184 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1185} 1186 1187void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1188 if (S->decl_empty()) return; 1189 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1190 "Scope shouldn't contain decls!"); 1191 1192 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1193 I != E; ++I) { 1194 Decl *TmpD = (*I); 1195 assert(TmpD && "This decl didn't get pushed??"); 1196 1197 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1198 NamedDecl *D = cast<NamedDecl>(TmpD); 1199 1200 if (!D->getDeclName()) continue; 1201 1202 // Diagnose unused variables in this scope. 1203 if (!S->hasErrorOccurred()) 1204 DiagnoseUnusedDecl(D); 1205 1206 // If this was a forward reference to a label, verify it was defined. 1207 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1208 CheckPoppedLabel(LD, *this); 1209 1210 // Remove this name from our lexical scope. 1211 IdResolver.RemoveDecl(D); 1212 } 1213} 1214 1215/// \brief Look for an Objective-C class in the translation unit. 1216/// 1217/// \param Id The name of the Objective-C class we're looking for. If 1218/// typo-correction fixes this name, the Id will be updated 1219/// to the fixed name. 1220/// 1221/// \param IdLoc The location of the name in the translation unit. 1222/// 1223/// \param TypoCorrection If true, this routine will attempt typo correction 1224/// if there is no class with the given name. 1225/// 1226/// \returns The declaration of the named Objective-C class, or NULL if the 1227/// class could not be found. 1228ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1229 SourceLocation IdLoc, 1230 bool DoTypoCorrection) { 1231 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1232 // creation from this context. 1233 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1234 1235 if (!IDecl && DoTypoCorrection) { 1236 // Perform typo correction at the given location, but only if we 1237 // find an Objective-C class name. 1238 TypoCorrection C; 1239 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1240 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1241 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1242 Diag(IdLoc, diag::err_undef_interface_suggest) 1243 << Id << IDecl->getDeclName() 1244 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1245 Diag(IDecl->getLocation(), diag::note_previous_decl) 1246 << IDecl->getDeclName(); 1247 1248 Id = IDecl->getIdentifier(); 1249 } 1250 } 1251 1252 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1253} 1254 1255/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1256/// from S, where a non-field would be declared. This routine copes 1257/// with the difference between C and C++ scoping rules in structs and 1258/// unions. For example, the following code is well-formed in C but 1259/// ill-formed in C++: 1260/// @code 1261/// struct S6 { 1262/// enum { BAR } e; 1263/// }; 1264/// 1265/// void test_S6() { 1266/// struct S6 a; 1267/// a.e = BAR; 1268/// } 1269/// @endcode 1270/// For the declaration of BAR, this routine will return a different 1271/// scope. The scope S will be the scope of the unnamed enumeration 1272/// within S6. In C++, this routine will return the scope associated 1273/// with S6, because the enumeration's scope is a transparent 1274/// context but structures can contain non-field names. In C, this 1275/// routine will return the translation unit scope, since the 1276/// enumeration's scope is a transparent context and structures cannot 1277/// contain non-field names. 1278Scope *Sema::getNonFieldDeclScope(Scope *S) { 1279 while (((S->getFlags() & Scope::DeclScope) == 0) || 1280 (S->getEntity() && 1281 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1282 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1283 S = S->getParent(); 1284 return S; 1285} 1286 1287/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1288/// file scope. lazily create a decl for it. ForRedeclaration is true 1289/// if we're creating this built-in in anticipation of redeclaring the 1290/// built-in. 1291NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1292 Scope *S, bool ForRedeclaration, 1293 SourceLocation Loc) { 1294 Builtin::ID BID = (Builtin::ID)bid; 1295 1296 ASTContext::GetBuiltinTypeError Error; 1297 QualType R = Context.GetBuiltinType(BID, Error); 1298 switch (Error) { 1299 case ASTContext::GE_None: 1300 // Okay 1301 break; 1302 1303 case ASTContext::GE_Missing_stdio: 1304 if (ForRedeclaration) 1305 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1306 << Context.BuiltinInfo.GetName(BID); 1307 return 0; 1308 1309 case ASTContext::GE_Missing_setjmp: 1310 if (ForRedeclaration) 1311 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1312 << Context.BuiltinInfo.GetName(BID); 1313 return 0; 1314 1315 case ASTContext::GE_Missing_ucontext: 1316 if (ForRedeclaration) 1317 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1318 << Context.BuiltinInfo.GetName(BID); 1319 return 0; 1320 } 1321 1322 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1323 Diag(Loc, diag::ext_implicit_lib_function_decl) 1324 << Context.BuiltinInfo.GetName(BID) 1325 << R; 1326 if (Context.BuiltinInfo.getHeaderName(BID) && 1327 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1328 != DiagnosticsEngine::Ignored) 1329 Diag(Loc, diag::note_please_include_header) 1330 << Context.BuiltinInfo.getHeaderName(BID) 1331 << Context.BuiltinInfo.GetName(BID); 1332 } 1333 1334 FunctionDecl *New = FunctionDecl::Create(Context, 1335 Context.getTranslationUnitDecl(), 1336 Loc, Loc, II, R, /*TInfo=*/0, 1337 SC_Extern, 1338 SC_None, false, 1339 /*hasPrototype=*/true); 1340 New->setImplicit(); 1341 1342 // Create Decl objects for each parameter, adding them to the 1343 // FunctionDecl. 1344 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1345 SmallVector<ParmVarDecl*, 16> Params; 1346 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1347 ParmVarDecl *parm = 1348 ParmVarDecl::Create(Context, New, SourceLocation(), 1349 SourceLocation(), 0, 1350 FT->getArgType(i), /*TInfo=*/0, 1351 SC_None, SC_None, 0); 1352 parm->setScopeInfo(0, i); 1353 Params.push_back(parm); 1354 } 1355 New->setParams(Params); 1356 } 1357 1358 AddKnownFunctionAttributes(New); 1359 1360 // TUScope is the translation-unit scope to insert this function into. 1361 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1362 // relate Scopes to DeclContexts, and probably eliminate CurContext 1363 // entirely, but we're not there yet. 1364 DeclContext *SavedContext = CurContext; 1365 CurContext = Context.getTranslationUnitDecl(); 1366 PushOnScopeChains(New, TUScope); 1367 CurContext = SavedContext; 1368 return New; 1369} 1370 1371bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1372 QualType OldType; 1373 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1374 OldType = OldTypedef->getUnderlyingType(); 1375 else 1376 OldType = Context.getTypeDeclType(Old); 1377 QualType NewType = New->getUnderlyingType(); 1378 1379 if (OldType != NewType && 1380 !OldType->isDependentType() && 1381 !NewType->isDependentType() && 1382 !Context.hasSameType(OldType, NewType)) { 1383 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1384 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1385 << Kind << NewType << OldType; 1386 if (Old->getLocation().isValid()) 1387 Diag(Old->getLocation(), diag::note_previous_definition); 1388 New->setInvalidDecl(); 1389 return true; 1390 } 1391 return false; 1392} 1393 1394/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1395/// same name and scope as a previous declaration 'Old'. Figure out 1396/// how to resolve this situation, merging decls or emitting 1397/// diagnostics as appropriate. If there was an error, set New to be invalid. 1398/// 1399void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1400 // If the new decl is known invalid already, don't bother doing any 1401 // merging checks. 1402 if (New->isInvalidDecl()) return; 1403 1404 // Allow multiple definitions for ObjC built-in typedefs. 1405 // FIXME: Verify the underlying types are equivalent! 1406 if (getLangOptions().ObjC1) { 1407 const IdentifierInfo *TypeID = New->getIdentifier(); 1408 switch (TypeID->getLength()) { 1409 default: break; 1410 case 2: 1411 if (!TypeID->isStr("id")) 1412 break; 1413 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1414 // Install the built-in type for 'id', ignoring the current definition. 1415 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1416 return; 1417 case 5: 1418 if (!TypeID->isStr("Class")) 1419 break; 1420 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1421 // Install the built-in type for 'Class', ignoring the current definition. 1422 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1423 return; 1424 case 3: 1425 if (!TypeID->isStr("SEL")) 1426 break; 1427 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1428 // Install the built-in type for 'SEL', ignoring the current definition. 1429 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1430 return; 1431 } 1432 // Fall through - the typedef name was not a builtin type. 1433 } 1434 1435 // Verify the old decl was also a type. 1436 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1437 if (!Old) { 1438 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1439 << New->getDeclName(); 1440 1441 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1442 if (OldD->getLocation().isValid()) 1443 Diag(OldD->getLocation(), diag::note_previous_definition); 1444 1445 return New->setInvalidDecl(); 1446 } 1447 1448 // If the old declaration is invalid, just give up here. 1449 if (Old->isInvalidDecl()) 1450 return New->setInvalidDecl(); 1451 1452 // If the typedef types are not identical, reject them in all languages and 1453 // with any extensions enabled. 1454 if (isIncompatibleTypedef(Old, New)) 1455 return; 1456 1457 // The types match. Link up the redeclaration chain if the old 1458 // declaration was a typedef. 1459 // FIXME: this is a potential source of weirdness if the type 1460 // spellings don't match exactly. 1461 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1462 New->setPreviousDeclaration(Typedef); 1463 1464 if (getLangOptions().MicrosoftExt) 1465 return; 1466 1467 if (getLangOptions().CPlusPlus) { 1468 // C++ [dcl.typedef]p2: 1469 // In a given non-class scope, a typedef specifier can be used to 1470 // redefine the name of any type declared in that scope to refer 1471 // to the type to which it already refers. 1472 if (!isa<CXXRecordDecl>(CurContext)) 1473 return; 1474 1475 // C++0x [dcl.typedef]p4: 1476 // In a given class scope, a typedef specifier can be used to redefine 1477 // any class-name declared in that scope that is not also a typedef-name 1478 // to refer to the type to which it already refers. 1479 // 1480 // This wording came in via DR424, which was a correction to the 1481 // wording in DR56, which accidentally banned code like: 1482 // 1483 // struct S { 1484 // typedef struct A { } A; 1485 // }; 1486 // 1487 // in the C++03 standard. We implement the C++0x semantics, which 1488 // allow the above but disallow 1489 // 1490 // struct S { 1491 // typedef int I; 1492 // typedef int I; 1493 // }; 1494 // 1495 // since that was the intent of DR56. 1496 if (!isa<TypedefNameDecl>(Old)) 1497 return; 1498 1499 Diag(New->getLocation(), diag::err_redefinition) 1500 << New->getDeclName(); 1501 Diag(Old->getLocation(), diag::note_previous_definition); 1502 return New->setInvalidDecl(); 1503 } 1504 1505 // If we have a redefinition of a typedef in C, emit a warning. This warning 1506 // is normally mapped to an error, but can be controlled with 1507 // -Wtypedef-redefinition. If either the original or the redefinition is 1508 // in a system header, don't emit this for compatibility with GCC. 1509 if (getDiagnostics().getSuppressSystemWarnings() && 1510 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1511 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1512 return; 1513 1514 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1515 << New->getDeclName(); 1516 Diag(Old->getLocation(), diag::note_previous_definition); 1517 return; 1518} 1519 1520/// DeclhasAttr - returns true if decl Declaration already has the target 1521/// attribute. 1522static bool 1523DeclHasAttr(const Decl *D, const Attr *A) { 1524 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1525 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1526 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1527 if ((*i)->getKind() == A->getKind()) { 1528 if (Ann) { 1529 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1530 return true; 1531 continue; 1532 } 1533 // FIXME: Don't hardcode this check 1534 if (OA && isa<OwnershipAttr>(*i)) 1535 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1536 return true; 1537 } 1538 1539 return false; 1540} 1541 1542/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1543void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1544 bool MergeDeprecation) { 1545 if (!Old->hasAttrs()) 1546 return; 1547 1548 bool foundAny = New->hasAttrs(); 1549 1550 // Ensure that any moving of objects within the allocated map is done before 1551 // we process them. 1552 if (!foundAny) New->setAttrs(AttrVec()); 1553 1554 for (specific_attr_iterator<InheritableAttr> 1555 i = Old->specific_attr_begin<InheritableAttr>(), 1556 e = Old->specific_attr_end<InheritableAttr>(); 1557 i != e; ++i) { 1558 // Ignore deprecated/unavailable/availability attributes if requested. 1559 if (!MergeDeprecation && 1560 (isa<DeprecatedAttr>(*i) || 1561 isa<UnavailableAttr>(*i) || 1562 isa<AvailabilityAttr>(*i))) 1563 continue; 1564 1565 if (!DeclHasAttr(New, *i)) { 1566 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1567 newAttr->setInherited(true); 1568 New->addAttr(newAttr); 1569 foundAny = true; 1570 } 1571 } 1572 1573 if (!foundAny) New->dropAttrs(); 1574} 1575 1576/// mergeParamDeclAttributes - Copy attributes from the old parameter 1577/// to the new one. 1578static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1579 const ParmVarDecl *oldDecl, 1580 ASTContext &C) { 1581 if (!oldDecl->hasAttrs()) 1582 return; 1583 1584 bool foundAny = newDecl->hasAttrs(); 1585 1586 // Ensure that any moving of objects within the allocated map is 1587 // done before we process them. 1588 if (!foundAny) newDecl->setAttrs(AttrVec()); 1589 1590 for (specific_attr_iterator<InheritableParamAttr> 1591 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1592 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1593 if (!DeclHasAttr(newDecl, *i)) { 1594 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1595 newAttr->setInherited(true); 1596 newDecl->addAttr(newAttr); 1597 foundAny = true; 1598 } 1599 } 1600 1601 if (!foundAny) newDecl->dropAttrs(); 1602} 1603 1604namespace { 1605 1606/// Used in MergeFunctionDecl to keep track of function parameters in 1607/// C. 1608struct GNUCompatibleParamWarning { 1609 ParmVarDecl *OldParm; 1610 ParmVarDecl *NewParm; 1611 QualType PromotedType; 1612}; 1613 1614} 1615 1616/// getSpecialMember - get the special member enum for a method. 1617Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1618 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1619 if (Ctor->isDefaultConstructor()) 1620 return Sema::CXXDefaultConstructor; 1621 1622 if (Ctor->isCopyConstructor()) 1623 return Sema::CXXCopyConstructor; 1624 1625 if (Ctor->isMoveConstructor()) 1626 return Sema::CXXMoveConstructor; 1627 } else if (isa<CXXDestructorDecl>(MD)) { 1628 return Sema::CXXDestructor; 1629 } else if (MD->isCopyAssignmentOperator()) { 1630 return Sema::CXXCopyAssignment; 1631 } else if (MD->isMoveAssignmentOperator()) { 1632 return Sema::CXXMoveAssignment; 1633 } 1634 1635 return Sema::CXXInvalid; 1636} 1637 1638/// canRedefineFunction - checks if a function can be redefined. Currently, 1639/// only extern inline functions can be redefined, and even then only in 1640/// GNU89 mode. 1641static bool canRedefineFunction(const FunctionDecl *FD, 1642 const LangOptions& LangOpts) { 1643 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1644 !LangOpts.CPlusPlus && 1645 FD->isInlineSpecified() && 1646 FD->getStorageClass() == SC_Extern); 1647} 1648 1649/// MergeFunctionDecl - We just parsed a function 'New' from 1650/// declarator D which has the same name and scope as a previous 1651/// declaration 'Old'. Figure out how to resolve this situation, 1652/// merging decls or emitting diagnostics as appropriate. 1653/// 1654/// In C++, New and Old must be declarations that are not 1655/// overloaded. Use IsOverload to determine whether New and Old are 1656/// overloaded, and to select the Old declaration that New should be 1657/// merged with. 1658/// 1659/// Returns true if there was an error, false otherwise. 1660bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1661 // Verify the old decl was also a function. 1662 FunctionDecl *Old = 0; 1663 if (FunctionTemplateDecl *OldFunctionTemplate 1664 = dyn_cast<FunctionTemplateDecl>(OldD)) 1665 Old = OldFunctionTemplate->getTemplatedDecl(); 1666 else 1667 Old = dyn_cast<FunctionDecl>(OldD); 1668 if (!Old) { 1669 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1670 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1671 Diag(Shadow->getTargetDecl()->getLocation(), 1672 diag::note_using_decl_target); 1673 Diag(Shadow->getUsingDecl()->getLocation(), 1674 diag::note_using_decl) << 0; 1675 return true; 1676 } 1677 1678 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1679 << New->getDeclName(); 1680 Diag(OldD->getLocation(), diag::note_previous_definition); 1681 return true; 1682 } 1683 1684 // Determine whether the previous declaration was a definition, 1685 // implicit declaration, or a declaration. 1686 diag::kind PrevDiag; 1687 if (Old->isThisDeclarationADefinition()) 1688 PrevDiag = diag::note_previous_definition; 1689 else if (Old->isImplicit()) 1690 PrevDiag = diag::note_previous_implicit_declaration; 1691 else 1692 PrevDiag = diag::note_previous_declaration; 1693 1694 QualType OldQType = Context.getCanonicalType(Old->getType()); 1695 QualType NewQType = Context.getCanonicalType(New->getType()); 1696 1697 // Don't complain about this if we're in GNU89 mode and the old function 1698 // is an extern inline function. 1699 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1700 New->getStorageClass() == SC_Static && 1701 Old->getStorageClass() != SC_Static && 1702 !canRedefineFunction(Old, getLangOptions())) { 1703 if (getLangOptions().MicrosoftExt) { 1704 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1705 Diag(Old->getLocation(), PrevDiag); 1706 } else { 1707 Diag(New->getLocation(), diag::err_static_non_static) << New; 1708 Diag(Old->getLocation(), PrevDiag); 1709 return true; 1710 } 1711 } 1712 1713 // If a function is first declared with a calling convention, but is 1714 // later declared or defined without one, the second decl assumes the 1715 // calling convention of the first. 1716 // 1717 // For the new decl, we have to look at the NON-canonical type to tell the 1718 // difference between a function that really doesn't have a calling 1719 // convention and one that is declared cdecl. That's because in 1720 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1721 // because it is the default calling convention. 1722 // 1723 // Note also that we DO NOT return at this point, because we still have 1724 // other tests to run. 1725 const FunctionType *OldType = cast<FunctionType>(OldQType); 1726 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1727 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1728 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1729 bool RequiresAdjustment = false; 1730 if (OldTypeInfo.getCC() != CC_Default && 1731 NewTypeInfo.getCC() == CC_Default) { 1732 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1733 RequiresAdjustment = true; 1734 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1735 NewTypeInfo.getCC())) { 1736 // Calling conventions really aren't compatible, so complain. 1737 Diag(New->getLocation(), diag::err_cconv_change) 1738 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1739 << (OldTypeInfo.getCC() == CC_Default) 1740 << (OldTypeInfo.getCC() == CC_Default ? "" : 1741 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1742 Diag(Old->getLocation(), diag::note_previous_declaration); 1743 return true; 1744 } 1745 1746 // FIXME: diagnose the other way around? 1747 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1748 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1749 RequiresAdjustment = true; 1750 } 1751 1752 // Merge regparm attribute. 1753 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1754 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1755 if (NewTypeInfo.getHasRegParm()) { 1756 Diag(New->getLocation(), diag::err_regparm_mismatch) 1757 << NewType->getRegParmType() 1758 << OldType->getRegParmType(); 1759 Diag(Old->getLocation(), diag::note_previous_declaration); 1760 return true; 1761 } 1762 1763 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1764 RequiresAdjustment = true; 1765 } 1766 1767 // Merge ns_returns_retained attribute. 1768 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1769 if (NewTypeInfo.getProducesResult()) { 1770 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1771 Diag(Old->getLocation(), diag::note_previous_declaration); 1772 return true; 1773 } 1774 1775 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1776 RequiresAdjustment = true; 1777 } 1778 1779 if (RequiresAdjustment) { 1780 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1781 New->setType(QualType(NewType, 0)); 1782 NewQType = Context.getCanonicalType(New->getType()); 1783 } 1784 1785 if (getLangOptions().CPlusPlus) { 1786 // (C++98 13.1p2): 1787 // Certain function declarations cannot be overloaded: 1788 // -- Function declarations that differ only in the return type 1789 // cannot be overloaded. 1790 QualType OldReturnType = OldType->getResultType(); 1791 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1792 QualType ResQT; 1793 if (OldReturnType != NewReturnType) { 1794 if (NewReturnType->isObjCObjectPointerType() 1795 && OldReturnType->isObjCObjectPointerType()) 1796 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1797 if (ResQT.isNull()) { 1798 if (New->isCXXClassMember() && New->isOutOfLine()) 1799 Diag(New->getLocation(), 1800 diag::err_member_def_does_not_match_ret_type) << New; 1801 else 1802 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1803 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1804 return true; 1805 } 1806 else 1807 NewQType = ResQT; 1808 } 1809 1810 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1811 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1812 if (OldMethod && NewMethod) { 1813 // Preserve triviality. 1814 NewMethod->setTrivial(OldMethod->isTrivial()); 1815 1816 // MSVC allows explicit template specialization at class scope: 1817 // 2 CXMethodDecls referring to the same function will be injected. 1818 // We don't want a redeclartion error. 1819 bool IsClassScopeExplicitSpecialization = 1820 OldMethod->isFunctionTemplateSpecialization() && 1821 NewMethod->isFunctionTemplateSpecialization(); 1822 bool isFriend = NewMethod->getFriendObjectKind(); 1823 1824 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1825 !IsClassScopeExplicitSpecialization) { 1826 // -- Member function declarations with the same name and the 1827 // same parameter types cannot be overloaded if any of them 1828 // is a static member function declaration. 1829 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1830 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1831 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1832 return true; 1833 } 1834 1835 // C++ [class.mem]p1: 1836 // [...] A member shall not be declared twice in the 1837 // member-specification, except that a nested class or member 1838 // class template can be declared and then later defined. 1839 unsigned NewDiag; 1840 if (isa<CXXConstructorDecl>(OldMethod)) 1841 NewDiag = diag::err_constructor_redeclared; 1842 else if (isa<CXXDestructorDecl>(NewMethod)) 1843 NewDiag = diag::err_destructor_redeclared; 1844 else if (isa<CXXConversionDecl>(NewMethod)) 1845 NewDiag = diag::err_conv_function_redeclared; 1846 else 1847 NewDiag = diag::err_member_redeclared; 1848 1849 Diag(New->getLocation(), NewDiag); 1850 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1851 1852 // Complain if this is an explicit declaration of a special 1853 // member that was initially declared implicitly. 1854 // 1855 // As an exception, it's okay to befriend such methods in order 1856 // to permit the implicit constructor/destructor/operator calls. 1857 } else if (OldMethod->isImplicit()) { 1858 if (isFriend) { 1859 NewMethod->setImplicit(); 1860 } else { 1861 Diag(NewMethod->getLocation(), 1862 diag::err_definition_of_implicitly_declared_member) 1863 << New << getSpecialMember(OldMethod); 1864 return true; 1865 } 1866 } else if (OldMethod->isExplicitlyDefaulted()) { 1867 Diag(NewMethod->getLocation(), 1868 diag::err_definition_of_explicitly_defaulted_member) 1869 << getSpecialMember(OldMethod); 1870 return true; 1871 } 1872 } 1873 1874 // (C++98 8.3.5p3): 1875 // All declarations for a function shall agree exactly in both the 1876 // return type and the parameter-type-list. 1877 // We also want to respect all the extended bits except noreturn. 1878 1879 // noreturn should now match unless the old type info didn't have it. 1880 QualType OldQTypeForComparison = OldQType; 1881 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1882 assert(OldQType == QualType(OldType, 0)); 1883 const FunctionType *OldTypeForComparison 1884 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1885 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1886 assert(OldQTypeForComparison.isCanonical()); 1887 } 1888 1889 if (OldQTypeForComparison == NewQType) 1890 return MergeCompatibleFunctionDecls(New, Old); 1891 1892 // Fall through for conflicting redeclarations and redefinitions. 1893 } 1894 1895 // C: Function types need to be compatible, not identical. This handles 1896 // duplicate function decls like "void f(int); void f(enum X);" properly. 1897 if (!getLangOptions().CPlusPlus && 1898 Context.typesAreCompatible(OldQType, NewQType)) { 1899 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1900 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1901 const FunctionProtoType *OldProto = 0; 1902 if (isa<FunctionNoProtoType>(NewFuncType) && 1903 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1904 // The old declaration provided a function prototype, but the 1905 // new declaration does not. Merge in the prototype. 1906 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1907 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1908 OldProto->arg_type_end()); 1909 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1910 ParamTypes.data(), ParamTypes.size(), 1911 OldProto->getExtProtoInfo()); 1912 New->setType(NewQType); 1913 New->setHasInheritedPrototype(); 1914 1915 // Synthesize a parameter for each argument type. 1916 SmallVector<ParmVarDecl*, 16> Params; 1917 for (FunctionProtoType::arg_type_iterator 1918 ParamType = OldProto->arg_type_begin(), 1919 ParamEnd = OldProto->arg_type_end(); 1920 ParamType != ParamEnd; ++ParamType) { 1921 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1922 SourceLocation(), 1923 SourceLocation(), 0, 1924 *ParamType, /*TInfo=*/0, 1925 SC_None, SC_None, 1926 0); 1927 Param->setScopeInfo(0, Params.size()); 1928 Param->setImplicit(); 1929 Params.push_back(Param); 1930 } 1931 1932 New->setParams(Params); 1933 } 1934 1935 return MergeCompatibleFunctionDecls(New, Old); 1936 } 1937 1938 // GNU C permits a K&R definition to follow a prototype declaration 1939 // if the declared types of the parameters in the K&R definition 1940 // match the types in the prototype declaration, even when the 1941 // promoted types of the parameters from the K&R definition differ 1942 // from the types in the prototype. GCC then keeps the types from 1943 // the prototype. 1944 // 1945 // If a variadic prototype is followed by a non-variadic K&R definition, 1946 // the K&R definition becomes variadic. This is sort of an edge case, but 1947 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1948 // C99 6.9.1p8. 1949 if (!getLangOptions().CPlusPlus && 1950 Old->hasPrototype() && !New->hasPrototype() && 1951 New->getType()->getAs<FunctionProtoType>() && 1952 Old->getNumParams() == New->getNumParams()) { 1953 SmallVector<QualType, 16> ArgTypes; 1954 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1955 const FunctionProtoType *OldProto 1956 = Old->getType()->getAs<FunctionProtoType>(); 1957 const FunctionProtoType *NewProto 1958 = New->getType()->getAs<FunctionProtoType>(); 1959 1960 // Determine whether this is the GNU C extension. 1961 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1962 NewProto->getResultType()); 1963 bool LooseCompatible = !MergedReturn.isNull(); 1964 for (unsigned Idx = 0, End = Old->getNumParams(); 1965 LooseCompatible && Idx != End; ++Idx) { 1966 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1967 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1968 if (Context.typesAreCompatible(OldParm->getType(), 1969 NewProto->getArgType(Idx))) { 1970 ArgTypes.push_back(NewParm->getType()); 1971 } else if (Context.typesAreCompatible(OldParm->getType(), 1972 NewParm->getType(), 1973 /*CompareUnqualified=*/true)) { 1974 GNUCompatibleParamWarning Warn 1975 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1976 Warnings.push_back(Warn); 1977 ArgTypes.push_back(NewParm->getType()); 1978 } else 1979 LooseCompatible = false; 1980 } 1981 1982 if (LooseCompatible) { 1983 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1984 Diag(Warnings[Warn].NewParm->getLocation(), 1985 diag::ext_param_promoted_not_compatible_with_prototype) 1986 << Warnings[Warn].PromotedType 1987 << Warnings[Warn].OldParm->getType(); 1988 if (Warnings[Warn].OldParm->getLocation().isValid()) 1989 Diag(Warnings[Warn].OldParm->getLocation(), 1990 diag::note_previous_declaration); 1991 } 1992 1993 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1994 ArgTypes.size(), 1995 OldProto->getExtProtoInfo())); 1996 return MergeCompatibleFunctionDecls(New, Old); 1997 } 1998 1999 // Fall through to diagnose conflicting types. 2000 } 2001 2002 // A function that has already been declared has been redeclared or defined 2003 // with a different type- show appropriate diagnostic 2004 if (unsigned BuiltinID = Old->getBuiltinID()) { 2005 // The user has declared a builtin function with an incompatible 2006 // signature. 2007 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2008 // The function the user is redeclaring is a library-defined 2009 // function like 'malloc' or 'printf'. Warn about the 2010 // redeclaration, then pretend that we don't know about this 2011 // library built-in. 2012 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2013 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2014 << Old << Old->getType(); 2015 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2016 Old->setInvalidDecl(); 2017 return false; 2018 } 2019 2020 PrevDiag = diag::note_previous_builtin_declaration; 2021 } 2022 2023 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2024 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2025 return true; 2026} 2027 2028/// \brief Completes the merge of two function declarations that are 2029/// known to be compatible. 2030/// 2031/// This routine handles the merging of attributes and other 2032/// properties of function declarations form the old declaration to 2033/// the new declaration, once we know that New is in fact a 2034/// redeclaration of Old. 2035/// 2036/// \returns false 2037bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2038 // Merge the attributes 2039 mergeDeclAttributes(New, Old); 2040 2041 // Merge the storage class. 2042 if (Old->getStorageClass() != SC_Extern && 2043 Old->getStorageClass() != SC_None) 2044 New->setStorageClass(Old->getStorageClass()); 2045 2046 // Merge "pure" flag. 2047 if (Old->isPure()) 2048 New->setPure(); 2049 2050 // Merge attributes from the parameters. These can mismatch with K&R 2051 // declarations. 2052 if (New->getNumParams() == Old->getNumParams()) 2053 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2054 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2055 Context); 2056 2057 if (getLangOptions().CPlusPlus) 2058 return MergeCXXFunctionDecl(New, Old); 2059 2060 return false; 2061} 2062 2063 2064void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2065 ObjCMethodDecl *oldMethod) { 2066 // We don't want to merge unavailable and deprecated attributes 2067 // except from interface to implementation. 2068 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2069 2070 // Merge the attributes. 2071 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2072 2073 // Merge attributes from the parameters. 2074 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2075 for (ObjCMethodDecl::param_iterator 2076 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2077 ni != ne; ++ni, ++oi) 2078 mergeParamDeclAttributes(*ni, *oi, Context); 2079 2080 CheckObjCMethodOverride(newMethod, oldMethod, true); 2081} 2082 2083/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2084/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2085/// emitting diagnostics as appropriate. 2086/// 2087/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2088/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2089/// check them before the initializer is attached. 2090/// 2091void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2092 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2093 return; 2094 2095 QualType MergedT; 2096 if (getLangOptions().CPlusPlus) { 2097 AutoType *AT = New->getType()->getContainedAutoType(); 2098 if (AT && !AT->isDeduced()) { 2099 // We don't know what the new type is until the initializer is attached. 2100 return; 2101 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2102 // These could still be something that needs exception specs checked. 2103 return MergeVarDeclExceptionSpecs(New, Old); 2104 } 2105 // C++ [basic.link]p10: 2106 // [...] the types specified by all declarations referring to a given 2107 // object or function shall be identical, except that declarations for an 2108 // array object can specify array types that differ by the presence or 2109 // absence of a major array bound (8.3.4). 2110 else if (Old->getType()->isIncompleteArrayType() && 2111 New->getType()->isArrayType()) { 2112 CanQual<ArrayType> OldArray 2113 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2114 CanQual<ArrayType> NewArray 2115 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2116 if (OldArray->getElementType() == NewArray->getElementType()) 2117 MergedT = New->getType(); 2118 } else if (Old->getType()->isArrayType() && 2119 New->getType()->isIncompleteArrayType()) { 2120 CanQual<ArrayType> OldArray 2121 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2122 CanQual<ArrayType> NewArray 2123 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2124 if (OldArray->getElementType() == NewArray->getElementType()) 2125 MergedT = Old->getType(); 2126 } else if (New->getType()->isObjCObjectPointerType() 2127 && Old->getType()->isObjCObjectPointerType()) { 2128 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2129 Old->getType()); 2130 } 2131 } else { 2132 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2133 } 2134 if (MergedT.isNull()) { 2135 Diag(New->getLocation(), diag::err_redefinition_different_type) 2136 << New->getDeclName(); 2137 Diag(Old->getLocation(), diag::note_previous_definition); 2138 return New->setInvalidDecl(); 2139 } 2140 New->setType(MergedT); 2141} 2142 2143/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2144/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2145/// situation, merging decls or emitting diagnostics as appropriate. 2146/// 2147/// Tentative definition rules (C99 6.9.2p2) are checked by 2148/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2149/// definitions here, since the initializer hasn't been attached. 2150/// 2151void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2152 // If the new decl is already invalid, don't do any other checking. 2153 if (New->isInvalidDecl()) 2154 return; 2155 2156 // Verify the old decl was also a variable. 2157 VarDecl *Old = 0; 2158 if (!Previous.isSingleResult() || 2159 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2160 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2161 << New->getDeclName(); 2162 Diag(Previous.getRepresentativeDecl()->getLocation(), 2163 diag::note_previous_definition); 2164 return New->setInvalidDecl(); 2165 } 2166 2167 // C++ [class.mem]p1: 2168 // A member shall not be declared twice in the member-specification [...] 2169 // 2170 // Here, we need only consider static data members. 2171 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2172 Diag(New->getLocation(), diag::err_duplicate_member) 2173 << New->getIdentifier(); 2174 Diag(Old->getLocation(), diag::note_previous_declaration); 2175 New->setInvalidDecl(); 2176 } 2177 2178 mergeDeclAttributes(New, Old); 2179 // Warn if an already-declared variable is made a weak_import in a subsequent 2180 // declaration 2181 if (New->getAttr<WeakImportAttr>() && 2182 Old->getStorageClass() == SC_None && 2183 !Old->getAttr<WeakImportAttr>()) { 2184 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2185 Diag(Old->getLocation(), diag::note_previous_definition); 2186 // Remove weak_import attribute on new declaration. 2187 New->dropAttr<WeakImportAttr>(); 2188 } 2189 2190 // Merge the types. 2191 MergeVarDeclTypes(New, Old); 2192 if (New->isInvalidDecl()) 2193 return; 2194 2195 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2196 if (New->getStorageClass() == SC_Static && 2197 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2198 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2199 Diag(Old->getLocation(), diag::note_previous_definition); 2200 return New->setInvalidDecl(); 2201 } 2202 // C99 6.2.2p4: 2203 // For an identifier declared with the storage-class specifier 2204 // extern in a scope in which a prior declaration of that 2205 // identifier is visible,23) if the prior declaration specifies 2206 // internal or external linkage, the linkage of the identifier at 2207 // the later declaration is the same as the linkage specified at 2208 // the prior declaration. If no prior declaration is visible, or 2209 // if the prior declaration specifies no linkage, then the 2210 // identifier has external linkage. 2211 if (New->hasExternalStorage() && Old->hasLinkage()) 2212 /* Okay */; 2213 else if (New->getStorageClass() != SC_Static && 2214 Old->getStorageClass() == SC_Static) { 2215 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2216 Diag(Old->getLocation(), diag::note_previous_definition); 2217 return New->setInvalidDecl(); 2218 } 2219 2220 // Check if extern is followed by non-extern and vice-versa. 2221 if (New->hasExternalStorage() && 2222 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2223 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2224 Diag(Old->getLocation(), diag::note_previous_definition); 2225 return New->setInvalidDecl(); 2226 } 2227 if (Old->hasExternalStorage() && 2228 !New->hasLinkage() && New->isLocalVarDecl()) { 2229 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2230 Diag(Old->getLocation(), diag::note_previous_definition); 2231 return New->setInvalidDecl(); 2232 } 2233 2234 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2235 2236 // FIXME: The test for external storage here seems wrong? We still 2237 // need to check for mismatches. 2238 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2239 // Don't complain about out-of-line definitions of static members. 2240 !(Old->getLexicalDeclContext()->isRecord() && 2241 !New->getLexicalDeclContext()->isRecord())) { 2242 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2243 Diag(Old->getLocation(), diag::note_previous_definition); 2244 return New->setInvalidDecl(); 2245 } 2246 2247 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2248 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2249 Diag(Old->getLocation(), diag::note_previous_definition); 2250 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2251 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2252 Diag(Old->getLocation(), diag::note_previous_definition); 2253 } 2254 2255 // C++ doesn't have tentative definitions, so go right ahead and check here. 2256 const VarDecl *Def; 2257 if (getLangOptions().CPlusPlus && 2258 New->isThisDeclarationADefinition() == VarDecl::Definition && 2259 (Def = Old->getDefinition())) { 2260 Diag(New->getLocation(), diag::err_redefinition) 2261 << New->getDeclName(); 2262 Diag(Def->getLocation(), diag::note_previous_definition); 2263 New->setInvalidDecl(); 2264 return; 2265 } 2266 // c99 6.2.2 P4. 2267 // For an identifier declared with the storage-class specifier extern in a 2268 // scope in which a prior declaration of that identifier is visible, if 2269 // the prior declaration specifies internal or external linkage, the linkage 2270 // of the identifier at the later declaration is the same as the linkage 2271 // specified at the prior declaration. 2272 // FIXME. revisit this code. 2273 if (New->hasExternalStorage() && 2274 Old->getLinkage() == InternalLinkage && 2275 New->getDeclContext() == Old->getDeclContext()) 2276 New->setStorageClass(Old->getStorageClass()); 2277 2278 // Keep a chain of previous declarations. 2279 New->setPreviousDeclaration(Old); 2280 2281 // Inherit access appropriately. 2282 New->setAccess(Old->getAccess()); 2283} 2284 2285/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2286/// no declarator (e.g. "struct foo;") is parsed. 2287Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2288 DeclSpec &DS) { 2289 return ParsedFreeStandingDeclSpec(S, AS, DS, 2290 MultiTemplateParamsArg(*this, 0, 0)); 2291} 2292 2293/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2294/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2295/// parameters to cope with template friend declarations. 2296Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2297 DeclSpec &DS, 2298 MultiTemplateParamsArg TemplateParams) { 2299 Decl *TagD = 0; 2300 TagDecl *Tag = 0; 2301 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2302 DS.getTypeSpecType() == DeclSpec::TST_struct || 2303 DS.getTypeSpecType() == DeclSpec::TST_union || 2304 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2305 TagD = DS.getRepAsDecl(); 2306 2307 if (!TagD) // We probably had an error 2308 return 0; 2309 2310 // Note that the above type specs guarantee that the 2311 // type rep is a Decl, whereas in many of the others 2312 // it's a Type. 2313 if (isa<TagDecl>(TagD)) 2314 Tag = cast<TagDecl>(TagD); 2315 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2316 Tag = CTD->getTemplatedDecl(); 2317 } 2318 2319 if (Tag) 2320 Tag->setFreeStanding(); 2321 2322 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2323 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2324 // or incomplete types shall not be restrict-qualified." 2325 if (TypeQuals & DeclSpec::TQ_restrict) 2326 Diag(DS.getRestrictSpecLoc(), 2327 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2328 << DS.getSourceRange(); 2329 } 2330 2331 if (DS.isConstexprSpecified()) { 2332 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2333 // and definitions of functions and variables. 2334 if (Tag) 2335 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2336 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2337 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2338 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2339 else 2340 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2341 // Don't emit warnings after this error. 2342 return TagD; 2343 } 2344 2345 if (DS.isFriendSpecified()) { 2346 // If we're dealing with a decl but not a TagDecl, assume that 2347 // whatever routines created it handled the friendship aspect. 2348 if (TagD && !Tag) 2349 return 0; 2350 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2351 } 2352 2353 // Track whether we warned about the fact that there aren't any 2354 // declarators. 2355 bool emittedWarning = false; 2356 2357 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2358 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2359 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2360 if (getLangOptions().CPlusPlus || 2361 Record->getDeclContext()->isRecord()) 2362 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2363 2364 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2365 << DS.getSourceRange(); 2366 emittedWarning = true; 2367 } 2368 } 2369 2370 // Check for Microsoft C extension: anonymous struct. 2371 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2372 CurContext->isRecord() && 2373 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2374 // Handle 2 kinds of anonymous struct: 2375 // struct STRUCT; 2376 // and 2377 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2378 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2379 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2380 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2381 DS.getRepAsType().get()->isStructureType())) { 2382 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2383 << DS.getSourceRange(); 2384 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2385 } 2386 } 2387 2388 if (getLangOptions().CPlusPlus && 2389 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2390 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2391 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2392 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2393 Diag(Enum->getLocation(), diag::ext_no_declarators) 2394 << DS.getSourceRange(); 2395 emittedWarning = true; 2396 } 2397 2398 // Skip all the checks below if we have a type error. 2399 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2400 2401 if (!DS.isMissingDeclaratorOk()) { 2402 // Warn about typedefs of enums without names, since this is an 2403 // extension in both Microsoft and GNU. 2404 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2405 Tag && isa<EnumDecl>(Tag)) { 2406 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2407 << DS.getSourceRange(); 2408 return Tag; 2409 } 2410 2411 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2412 << DS.getSourceRange(); 2413 emittedWarning = true; 2414 } 2415 2416 // We're going to complain about a bunch of spurious specifiers; 2417 // only do this if we're declaring a tag, because otherwise we 2418 // should be getting diag::ext_no_declarators. 2419 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2420 return TagD; 2421 2422 // Note that a linkage-specification sets a storage class, but 2423 // 'extern "C" struct foo;' is actually valid and not theoretically 2424 // useless. 2425 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2426 if (!DS.isExternInLinkageSpec()) 2427 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2428 << DeclSpec::getSpecifierName(scs); 2429 2430 if (DS.isThreadSpecified()) 2431 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2432 if (DS.getTypeQualifiers()) { 2433 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2434 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2435 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2436 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2437 // Restrict is covered above. 2438 } 2439 if (DS.isInlineSpecified()) 2440 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2441 if (DS.isVirtualSpecified()) 2442 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2443 if (DS.isExplicitSpecified()) 2444 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2445 2446 if (DS.isModulePrivateSpecified() && 2447 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2448 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2449 << Tag->getTagKind() 2450 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2451 2452 // Warn about ignored type attributes, for example: 2453 // __attribute__((aligned)) struct A; 2454 // Attributes should be placed after tag to apply to type declaration. 2455 if (!DS.getAttributes().empty()) { 2456 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2457 if (TypeSpecType == DeclSpec::TST_class || 2458 TypeSpecType == DeclSpec::TST_struct || 2459 TypeSpecType == DeclSpec::TST_union || 2460 TypeSpecType == DeclSpec::TST_enum) { 2461 AttributeList* attrs = DS.getAttributes().getList(); 2462 while (attrs) { 2463 Diag(attrs->getScopeLoc(), 2464 diag::warn_declspec_attribute_ignored) 2465 << attrs->getName() 2466 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2467 TypeSpecType == DeclSpec::TST_struct ? 1 : 2468 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2469 attrs = attrs->getNext(); 2470 } 2471 } 2472 } 2473 2474 return TagD; 2475} 2476 2477/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2478/// builds a statement for it and returns it so it is evaluated. 2479StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2480 StmtResult R; 2481 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2482 Expr *Exp = DS.getRepAsExpr(); 2483 QualType Ty = Exp->getType(); 2484 if (Ty->isPointerType()) { 2485 do 2486 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2487 while (Ty->isPointerType()); 2488 } 2489 if (Ty->isVariableArrayType()) { 2490 R = ActOnExprStmt(MakeFullExpr(Exp)); 2491 } 2492 } 2493 return R; 2494} 2495 2496/// We are trying to inject an anonymous member into the given scope; 2497/// check if there's an existing declaration that can't be overloaded. 2498/// 2499/// \return true if this is a forbidden redeclaration 2500static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2501 Scope *S, 2502 DeclContext *Owner, 2503 DeclarationName Name, 2504 SourceLocation NameLoc, 2505 unsigned diagnostic) { 2506 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2507 Sema::ForRedeclaration); 2508 if (!SemaRef.LookupName(R, S)) return false; 2509 2510 if (R.getAsSingle<TagDecl>()) 2511 return false; 2512 2513 // Pick a representative declaration. 2514 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2515 assert(PrevDecl && "Expected a non-null Decl"); 2516 2517 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2518 return false; 2519 2520 SemaRef.Diag(NameLoc, diagnostic) << Name; 2521 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2522 2523 return true; 2524} 2525 2526/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2527/// anonymous struct or union AnonRecord into the owning context Owner 2528/// and scope S. This routine will be invoked just after we realize 2529/// that an unnamed union or struct is actually an anonymous union or 2530/// struct, e.g., 2531/// 2532/// @code 2533/// union { 2534/// int i; 2535/// float f; 2536/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2537/// // f into the surrounding scope.x 2538/// @endcode 2539/// 2540/// This routine is recursive, injecting the names of nested anonymous 2541/// structs/unions into the owning context and scope as well. 2542static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2543 DeclContext *Owner, 2544 RecordDecl *AnonRecord, 2545 AccessSpecifier AS, 2546 SmallVector<NamedDecl*, 2> &Chaining, 2547 bool MSAnonStruct) { 2548 unsigned diagKind 2549 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2550 : diag::err_anonymous_struct_member_redecl; 2551 2552 bool Invalid = false; 2553 2554 // Look every FieldDecl and IndirectFieldDecl with a name. 2555 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2556 DEnd = AnonRecord->decls_end(); 2557 D != DEnd; ++D) { 2558 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2559 cast<NamedDecl>(*D)->getDeclName()) { 2560 ValueDecl *VD = cast<ValueDecl>(*D); 2561 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2562 VD->getLocation(), diagKind)) { 2563 // C++ [class.union]p2: 2564 // The names of the members of an anonymous union shall be 2565 // distinct from the names of any other entity in the 2566 // scope in which the anonymous union is declared. 2567 Invalid = true; 2568 } else { 2569 // C++ [class.union]p2: 2570 // For the purpose of name lookup, after the anonymous union 2571 // definition, the members of the anonymous union are 2572 // considered to have been defined in the scope in which the 2573 // anonymous union is declared. 2574 unsigned OldChainingSize = Chaining.size(); 2575 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2576 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2577 PE = IF->chain_end(); PI != PE; ++PI) 2578 Chaining.push_back(*PI); 2579 else 2580 Chaining.push_back(VD); 2581 2582 assert(Chaining.size() >= 2); 2583 NamedDecl **NamedChain = 2584 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2585 for (unsigned i = 0; i < Chaining.size(); i++) 2586 NamedChain[i] = Chaining[i]; 2587 2588 IndirectFieldDecl* IndirectField = 2589 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2590 VD->getIdentifier(), VD->getType(), 2591 NamedChain, Chaining.size()); 2592 2593 IndirectField->setAccess(AS); 2594 IndirectField->setImplicit(); 2595 SemaRef.PushOnScopeChains(IndirectField, S); 2596 2597 // That includes picking up the appropriate access specifier. 2598 if (AS != AS_none) IndirectField->setAccess(AS); 2599 2600 Chaining.resize(OldChainingSize); 2601 } 2602 } 2603 } 2604 2605 return Invalid; 2606} 2607 2608/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2609/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2610/// illegal input values are mapped to SC_None. 2611static StorageClass 2612StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2613 switch (StorageClassSpec) { 2614 case DeclSpec::SCS_unspecified: return SC_None; 2615 case DeclSpec::SCS_extern: return SC_Extern; 2616 case DeclSpec::SCS_static: return SC_Static; 2617 case DeclSpec::SCS_auto: return SC_Auto; 2618 case DeclSpec::SCS_register: return SC_Register; 2619 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2620 // Illegal SCSs map to None: error reporting is up to the caller. 2621 case DeclSpec::SCS_mutable: // Fall through. 2622 case DeclSpec::SCS_typedef: return SC_None; 2623 } 2624 llvm_unreachable("unknown storage class specifier"); 2625} 2626 2627/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2628/// a StorageClass. Any error reporting is up to the caller: 2629/// illegal input values are mapped to SC_None. 2630static StorageClass 2631StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2632 switch (StorageClassSpec) { 2633 case DeclSpec::SCS_unspecified: return SC_None; 2634 case DeclSpec::SCS_extern: return SC_Extern; 2635 case DeclSpec::SCS_static: return SC_Static; 2636 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2637 // Illegal SCSs map to None: error reporting is up to the caller. 2638 case DeclSpec::SCS_auto: // Fall through. 2639 case DeclSpec::SCS_mutable: // Fall through. 2640 case DeclSpec::SCS_register: // Fall through. 2641 case DeclSpec::SCS_typedef: return SC_None; 2642 } 2643 llvm_unreachable("unknown storage class specifier"); 2644} 2645 2646/// BuildAnonymousStructOrUnion - Handle the declaration of an 2647/// anonymous structure or union. Anonymous unions are a C++ feature 2648/// (C++ [class.union]) and a GNU C extension; anonymous structures 2649/// are a GNU C and GNU C++ extension. 2650Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2651 AccessSpecifier AS, 2652 RecordDecl *Record) { 2653 DeclContext *Owner = Record->getDeclContext(); 2654 2655 // Diagnose whether this anonymous struct/union is an extension. 2656 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2657 Diag(Record->getLocation(), diag::ext_anonymous_union); 2658 else if (!Record->isUnion()) 2659 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2660 2661 // C and C++ require different kinds of checks for anonymous 2662 // structs/unions. 2663 bool Invalid = false; 2664 if (getLangOptions().CPlusPlus) { 2665 const char* PrevSpec = 0; 2666 unsigned DiagID; 2667 if (Record->isUnion()) { 2668 // C++ [class.union]p6: 2669 // Anonymous unions declared in a named namespace or in the 2670 // global namespace shall be declared static. 2671 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2672 (isa<TranslationUnitDecl>(Owner) || 2673 (isa<NamespaceDecl>(Owner) && 2674 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2675 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2676 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2677 2678 // Recover by adding 'static'. 2679 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2680 PrevSpec, DiagID); 2681 } 2682 // C++ [class.union]p6: 2683 // A storage class is not allowed in a declaration of an 2684 // anonymous union in a class scope. 2685 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2686 isa<RecordDecl>(Owner)) { 2687 Diag(DS.getStorageClassSpecLoc(), 2688 diag::err_anonymous_union_with_storage_spec) 2689 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2690 2691 // Recover by removing the storage specifier. 2692 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2693 SourceLocation(), 2694 PrevSpec, DiagID); 2695 } 2696 } 2697 2698 // Ignore const/volatile/restrict qualifiers. 2699 if (DS.getTypeQualifiers()) { 2700 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2701 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2702 << Record->isUnion() << 0 2703 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2704 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2705 Diag(DS.getVolatileSpecLoc(), 2706 diag::ext_anonymous_struct_union_qualified) 2707 << Record->isUnion() << 1 2708 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2709 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2710 Diag(DS.getRestrictSpecLoc(), 2711 diag::ext_anonymous_struct_union_qualified) 2712 << Record->isUnion() << 2 2713 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2714 2715 DS.ClearTypeQualifiers(); 2716 } 2717 2718 // C++ [class.union]p2: 2719 // The member-specification of an anonymous union shall only 2720 // define non-static data members. [Note: nested types and 2721 // functions cannot be declared within an anonymous union. ] 2722 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2723 MemEnd = Record->decls_end(); 2724 Mem != MemEnd; ++Mem) { 2725 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2726 // C++ [class.union]p3: 2727 // An anonymous union shall not have private or protected 2728 // members (clause 11). 2729 assert(FD->getAccess() != AS_none); 2730 if (FD->getAccess() != AS_public) { 2731 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2732 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2733 Invalid = true; 2734 } 2735 2736 // C++ [class.union]p1 2737 // An object of a class with a non-trivial constructor, a non-trivial 2738 // copy constructor, a non-trivial destructor, or a non-trivial copy 2739 // assignment operator cannot be a member of a union, nor can an 2740 // array of such objects. 2741 if (CheckNontrivialField(FD)) 2742 Invalid = true; 2743 } else if ((*Mem)->isImplicit()) { 2744 // Any implicit members are fine. 2745 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2746 // This is a type that showed up in an 2747 // elaborated-type-specifier inside the anonymous struct or 2748 // union, but which actually declares a type outside of the 2749 // anonymous struct or union. It's okay. 2750 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2751 if (!MemRecord->isAnonymousStructOrUnion() && 2752 MemRecord->getDeclName()) { 2753 // Visual C++ allows type definition in anonymous struct or union. 2754 if (getLangOptions().MicrosoftExt) 2755 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2756 << (int)Record->isUnion(); 2757 else { 2758 // This is a nested type declaration. 2759 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2760 << (int)Record->isUnion(); 2761 Invalid = true; 2762 } 2763 } 2764 } else if (isa<AccessSpecDecl>(*Mem)) { 2765 // Any access specifier is fine. 2766 } else { 2767 // We have something that isn't a non-static data 2768 // member. Complain about it. 2769 unsigned DK = diag::err_anonymous_record_bad_member; 2770 if (isa<TypeDecl>(*Mem)) 2771 DK = diag::err_anonymous_record_with_type; 2772 else if (isa<FunctionDecl>(*Mem)) 2773 DK = diag::err_anonymous_record_with_function; 2774 else if (isa<VarDecl>(*Mem)) 2775 DK = diag::err_anonymous_record_with_static; 2776 2777 // Visual C++ allows type definition in anonymous struct or union. 2778 if (getLangOptions().MicrosoftExt && 2779 DK == diag::err_anonymous_record_with_type) 2780 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2781 << (int)Record->isUnion(); 2782 else { 2783 Diag((*Mem)->getLocation(), DK) 2784 << (int)Record->isUnion(); 2785 Invalid = true; 2786 } 2787 } 2788 } 2789 } 2790 2791 if (!Record->isUnion() && !Owner->isRecord()) { 2792 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2793 << (int)getLangOptions().CPlusPlus; 2794 Invalid = true; 2795 } 2796 2797 // Mock up a declarator. 2798 Declarator Dc(DS, Declarator::MemberContext); 2799 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2800 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2801 2802 // Create a declaration for this anonymous struct/union. 2803 NamedDecl *Anon = 0; 2804 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2805 Anon = FieldDecl::Create(Context, OwningClass, 2806 DS.getSourceRange().getBegin(), 2807 Record->getLocation(), 2808 /*IdentifierInfo=*/0, 2809 Context.getTypeDeclType(Record), 2810 TInfo, 2811 /*BitWidth=*/0, /*Mutable=*/false, 2812 /*HasInit=*/false); 2813 Anon->setAccess(AS); 2814 if (getLangOptions().CPlusPlus) 2815 FieldCollector->Add(cast<FieldDecl>(Anon)); 2816 } else { 2817 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2818 assert(SCSpec != DeclSpec::SCS_typedef && 2819 "Parser allowed 'typedef' as storage class VarDecl."); 2820 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2821 if (SCSpec == DeclSpec::SCS_mutable) { 2822 // mutable can only appear on non-static class members, so it's always 2823 // an error here 2824 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2825 Invalid = true; 2826 SC = SC_None; 2827 } 2828 SCSpec = DS.getStorageClassSpecAsWritten(); 2829 VarDecl::StorageClass SCAsWritten 2830 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2831 2832 Anon = VarDecl::Create(Context, Owner, 2833 DS.getSourceRange().getBegin(), 2834 Record->getLocation(), /*IdentifierInfo=*/0, 2835 Context.getTypeDeclType(Record), 2836 TInfo, SC, SCAsWritten); 2837 2838 // Default-initialize the implicit variable. This initialization will be 2839 // trivial in almost all cases, except if a union member has an in-class 2840 // initializer: 2841 // union { int n = 0; }; 2842 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2843 } 2844 Anon->setImplicit(); 2845 2846 // Add the anonymous struct/union object to the current 2847 // context. We'll be referencing this object when we refer to one of 2848 // its members. 2849 Owner->addDecl(Anon); 2850 2851 // Inject the members of the anonymous struct/union into the owning 2852 // context and into the identifier resolver chain for name lookup 2853 // purposes. 2854 SmallVector<NamedDecl*, 2> Chain; 2855 Chain.push_back(Anon); 2856 2857 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2858 Chain, false)) 2859 Invalid = true; 2860 2861 // Mark this as an anonymous struct/union type. Note that we do not 2862 // do this until after we have already checked and injected the 2863 // members of this anonymous struct/union type, because otherwise 2864 // the members could be injected twice: once by DeclContext when it 2865 // builds its lookup table, and once by 2866 // InjectAnonymousStructOrUnionMembers. 2867 Record->setAnonymousStructOrUnion(true); 2868 2869 if (Invalid) 2870 Anon->setInvalidDecl(); 2871 2872 return Anon; 2873} 2874 2875/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2876/// Microsoft C anonymous structure. 2877/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2878/// Example: 2879/// 2880/// struct A { int a; }; 2881/// struct B { struct A; int b; }; 2882/// 2883/// void foo() { 2884/// B var; 2885/// var.a = 3; 2886/// } 2887/// 2888Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2889 RecordDecl *Record) { 2890 2891 // If there is no Record, get the record via the typedef. 2892 if (!Record) 2893 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2894 2895 // Mock up a declarator. 2896 Declarator Dc(DS, Declarator::TypeNameContext); 2897 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2898 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2899 2900 // Create a declaration for this anonymous struct. 2901 NamedDecl* Anon = FieldDecl::Create(Context, 2902 cast<RecordDecl>(CurContext), 2903 DS.getSourceRange().getBegin(), 2904 DS.getSourceRange().getBegin(), 2905 /*IdentifierInfo=*/0, 2906 Context.getTypeDeclType(Record), 2907 TInfo, 2908 /*BitWidth=*/0, /*Mutable=*/false, 2909 /*HasInit=*/false); 2910 Anon->setImplicit(); 2911 2912 // Add the anonymous struct object to the current context. 2913 CurContext->addDecl(Anon); 2914 2915 // Inject the members of the anonymous struct into the current 2916 // context and into the identifier resolver chain for name lookup 2917 // purposes. 2918 SmallVector<NamedDecl*, 2> Chain; 2919 Chain.push_back(Anon); 2920 2921 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2922 Record->getDefinition(), 2923 AS_none, Chain, true)) 2924 Anon->setInvalidDecl(); 2925 2926 return Anon; 2927} 2928 2929/// GetNameForDeclarator - Determine the full declaration name for the 2930/// given Declarator. 2931DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2932 return GetNameFromUnqualifiedId(D.getName()); 2933} 2934 2935/// \brief Retrieves the declaration name from a parsed unqualified-id. 2936DeclarationNameInfo 2937Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2938 DeclarationNameInfo NameInfo; 2939 NameInfo.setLoc(Name.StartLocation); 2940 2941 switch (Name.getKind()) { 2942 2943 case UnqualifiedId::IK_ImplicitSelfParam: 2944 case UnqualifiedId::IK_Identifier: 2945 NameInfo.setName(Name.Identifier); 2946 NameInfo.setLoc(Name.StartLocation); 2947 return NameInfo; 2948 2949 case UnqualifiedId::IK_OperatorFunctionId: 2950 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2951 Name.OperatorFunctionId.Operator)); 2952 NameInfo.setLoc(Name.StartLocation); 2953 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2954 = Name.OperatorFunctionId.SymbolLocations[0]; 2955 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2956 = Name.EndLocation.getRawEncoding(); 2957 return NameInfo; 2958 2959 case UnqualifiedId::IK_LiteralOperatorId: 2960 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2961 Name.Identifier)); 2962 NameInfo.setLoc(Name.StartLocation); 2963 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2964 return NameInfo; 2965 2966 case UnqualifiedId::IK_ConversionFunctionId: { 2967 TypeSourceInfo *TInfo; 2968 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2969 if (Ty.isNull()) 2970 return DeclarationNameInfo(); 2971 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2972 Context.getCanonicalType(Ty))); 2973 NameInfo.setLoc(Name.StartLocation); 2974 NameInfo.setNamedTypeInfo(TInfo); 2975 return NameInfo; 2976 } 2977 2978 case UnqualifiedId::IK_ConstructorName: { 2979 TypeSourceInfo *TInfo; 2980 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2981 if (Ty.isNull()) 2982 return DeclarationNameInfo(); 2983 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2984 Context.getCanonicalType(Ty))); 2985 NameInfo.setLoc(Name.StartLocation); 2986 NameInfo.setNamedTypeInfo(TInfo); 2987 return NameInfo; 2988 } 2989 2990 case UnqualifiedId::IK_ConstructorTemplateId: { 2991 // In well-formed code, we can only have a constructor 2992 // template-id that refers to the current context, so go there 2993 // to find the actual type being constructed. 2994 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2995 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2996 return DeclarationNameInfo(); 2997 2998 // Determine the type of the class being constructed. 2999 QualType CurClassType = Context.getTypeDeclType(CurClass); 3000 3001 // FIXME: Check two things: that the template-id names the same type as 3002 // CurClassType, and that the template-id does not occur when the name 3003 // was qualified. 3004 3005 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3006 Context.getCanonicalType(CurClassType))); 3007 NameInfo.setLoc(Name.StartLocation); 3008 // FIXME: should we retrieve TypeSourceInfo? 3009 NameInfo.setNamedTypeInfo(0); 3010 return NameInfo; 3011 } 3012 3013 case UnqualifiedId::IK_DestructorName: { 3014 TypeSourceInfo *TInfo; 3015 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3016 if (Ty.isNull()) 3017 return DeclarationNameInfo(); 3018 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3019 Context.getCanonicalType(Ty))); 3020 NameInfo.setLoc(Name.StartLocation); 3021 NameInfo.setNamedTypeInfo(TInfo); 3022 return NameInfo; 3023 } 3024 3025 case UnqualifiedId::IK_TemplateId: { 3026 TemplateName TName = Name.TemplateId->Template.get(); 3027 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3028 return Context.getNameForTemplate(TName, TNameLoc); 3029 } 3030 3031 } // switch (Name.getKind()) 3032 3033 llvm_unreachable("Unknown name kind"); 3034} 3035 3036static QualType getCoreType(QualType Ty) { 3037 do { 3038 if (Ty->isPointerType() || Ty->isReferenceType()) 3039 Ty = Ty->getPointeeType(); 3040 else if (Ty->isArrayType()) 3041 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3042 else 3043 return Ty.withoutLocalFastQualifiers(); 3044 } while (true); 3045} 3046 3047/// hasSimilarParameters - Determine whether the C++ functions Declaration 3048/// and Definition have "nearly" matching parameters. This heuristic is 3049/// used to improve diagnostics in the case where an out-of-line function 3050/// definition doesn't match any declaration within the class or namespace. 3051/// Also sets Params to the list of indices to the parameters that differ 3052/// between the declaration and the definition. If hasSimilarParameters 3053/// returns true and Params is empty, then all of the parameters match. 3054static bool hasSimilarParameters(ASTContext &Context, 3055 FunctionDecl *Declaration, 3056 FunctionDecl *Definition, 3057 llvm::SmallVectorImpl<unsigned> &Params) { 3058 Params.clear(); 3059 if (Declaration->param_size() != Definition->param_size()) 3060 return false; 3061 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3062 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3063 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3064 3065 // The parameter types are identical 3066 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3067 continue; 3068 3069 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3070 QualType DefParamBaseTy = getCoreType(DefParamTy); 3071 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3072 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3073 3074 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3075 (DeclTyName && DeclTyName == DefTyName)) 3076 Params.push_back(Idx); 3077 else // The two parameters aren't even close 3078 return false; 3079 } 3080 3081 return true; 3082} 3083 3084/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3085/// declarator needs to be rebuilt in the current instantiation. 3086/// Any bits of declarator which appear before the name are valid for 3087/// consideration here. That's specifically the type in the decl spec 3088/// and the base type in any member-pointer chunks. 3089static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3090 DeclarationName Name) { 3091 // The types we specifically need to rebuild are: 3092 // - typenames, typeofs, and decltypes 3093 // - types which will become injected class names 3094 // Of course, we also need to rebuild any type referencing such a 3095 // type. It's safest to just say "dependent", but we call out a 3096 // few cases here. 3097 3098 DeclSpec &DS = D.getMutableDeclSpec(); 3099 switch (DS.getTypeSpecType()) { 3100 case DeclSpec::TST_typename: 3101 case DeclSpec::TST_typeofType: 3102 case DeclSpec::TST_decltype: 3103 case DeclSpec::TST_underlyingType: 3104 case DeclSpec::TST_atomic: { 3105 // Grab the type from the parser. 3106 TypeSourceInfo *TSI = 0; 3107 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3108 if (T.isNull() || !T->isDependentType()) break; 3109 3110 // Make sure there's a type source info. This isn't really much 3111 // of a waste; most dependent types should have type source info 3112 // attached already. 3113 if (!TSI) 3114 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3115 3116 // Rebuild the type in the current instantiation. 3117 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3118 if (!TSI) return true; 3119 3120 // Store the new type back in the decl spec. 3121 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3122 DS.UpdateTypeRep(LocType); 3123 break; 3124 } 3125 3126 case DeclSpec::TST_typeofExpr: { 3127 Expr *E = DS.getRepAsExpr(); 3128 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3129 if (Result.isInvalid()) return true; 3130 DS.UpdateExprRep(Result.get()); 3131 break; 3132 } 3133 3134 default: 3135 // Nothing to do for these decl specs. 3136 break; 3137 } 3138 3139 // It doesn't matter what order we do this in. 3140 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3141 DeclaratorChunk &Chunk = D.getTypeObject(I); 3142 3143 // The only type information in the declarator which can come 3144 // before the declaration name is the base type of a member 3145 // pointer. 3146 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3147 continue; 3148 3149 // Rebuild the scope specifier in-place. 3150 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3151 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3152 return true; 3153 } 3154 3155 return false; 3156} 3157 3158Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3159 D.setFunctionDefinitionKind(FDK_Declaration); 3160 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3161 3162 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3163 Dcl->getDeclContext()->isFileContext()) 3164 Dcl->setTopLevelDeclInObjCContainer(); 3165 3166 return Dcl; 3167} 3168 3169/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3170/// If T is the name of a class, then each of the following shall have a 3171/// name different from T: 3172/// - every static data member of class T; 3173/// - every member function of class T 3174/// - every member of class T that is itself a type; 3175/// \returns true if the declaration name violates these rules. 3176bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3177 DeclarationNameInfo NameInfo) { 3178 DeclarationName Name = NameInfo.getName(); 3179 3180 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3181 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3182 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3183 return true; 3184 } 3185 3186 return false; 3187} 3188 3189Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3190 MultiTemplateParamsArg TemplateParamLists) { 3191 // TODO: consider using NameInfo for diagnostic. 3192 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3193 DeclarationName Name = NameInfo.getName(); 3194 3195 // All of these full declarators require an identifier. If it doesn't have 3196 // one, the ParsedFreeStandingDeclSpec action should be used. 3197 if (!Name) { 3198 if (!D.isInvalidType()) // Reject this if we think it is valid. 3199 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3200 diag::err_declarator_need_ident) 3201 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3202 return 0; 3203 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3204 return 0; 3205 3206 // The scope passed in may not be a decl scope. Zip up the scope tree until 3207 // we find one that is. 3208 while ((S->getFlags() & Scope::DeclScope) == 0 || 3209 (S->getFlags() & Scope::TemplateParamScope) != 0) 3210 S = S->getParent(); 3211 3212 DeclContext *DC = CurContext; 3213 if (D.getCXXScopeSpec().isInvalid()) 3214 D.setInvalidType(); 3215 else if (D.getCXXScopeSpec().isSet()) { 3216 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3217 UPPC_DeclarationQualifier)) 3218 return 0; 3219 3220 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3221 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3222 if (!DC) { 3223 // If we could not compute the declaration context, it's because the 3224 // declaration context is dependent but does not refer to a class, 3225 // class template, or class template partial specialization. Complain 3226 // and return early, to avoid the coming semantic disaster. 3227 Diag(D.getIdentifierLoc(), 3228 diag::err_template_qualified_declarator_no_match) 3229 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3230 << D.getCXXScopeSpec().getRange(); 3231 return 0; 3232 } 3233 bool IsDependentContext = DC->isDependentContext(); 3234 3235 if (!IsDependentContext && 3236 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3237 return 0; 3238 3239 if (isa<CXXRecordDecl>(DC)) { 3240 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3241 Diag(D.getIdentifierLoc(), 3242 diag::err_member_def_undefined_record) 3243 << Name << DC << D.getCXXScopeSpec().getRange(); 3244 D.setInvalidType(); 3245 } else if (isa<CXXRecordDecl>(CurContext) && 3246 !D.getDeclSpec().isFriendSpecified()) { 3247 // The user provided a superfluous scope specifier inside a class 3248 // definition: 3249 // 3250 // class X { 3251 // void X::f(); 3252 // }; 3253 if (CurContext->Equals(DC)) { 3254 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3255 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3256 } else { 3257 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3258 << Name << D.getCXXScopeSpec().getRange(); 3259 3260 // C++ constructors and destructors with incorrect scopes can break 3261 // our AST invariants by having the wrong underlying types. If 3262 // that's the case, then drop this declaration entirely. 3263 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3264 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3265 !Context.hasSameType(Name.getCXXNameType(), 3266 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3267 return 0; 3268 } 3269 3270 // Pretend that this qualifier was not here. 3271 D.getCXXScopeSpec().clear(); 3272 } 3273 } 3274 3275 // Check whether we need to rebuild the type of the given 3276 // declaration in the current instantiation. 3277 if (EnteringContext && IsDependentContext && 3278 TemplateParamLists.size() != 0) { 3279 ContextRAII SavedContext(*this, DC); 3280 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3281 D.setInvalidType(); 3282 } 3283 } 3284 3285 if (DiagnoseClassNameShadow(DC, NameInfo)) 3286 // If this is a typedef, we'll end up spewing multiple diagnostics. 3287 // Just return early; it's safer. 3288 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3289 return 0; 3290 3291 NamedDecl *New; 3292 3293 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3294 QualType R = TInfo->getType(); 3295 3296 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3297 UPPC_DeclarationType)) 3298 D.setInvalidType(); 3299 3300 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3301 ForRedeclaration); 3302 3303 // See if this is a redefinition of a variable in the same scope. 3304 if (!D.getCXXScopeSpec().isSet()) { 3305 bool IsLinkageLookup = false; 3306 3307 // If the declaration we're planning to build will be a function 3308 // or object with linkage, then look for another declaration with 3309 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3310 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3311 /* Do nothing*/; 3312 else if (R->isFunctionType()) { 3313 if (CurContext->isFunctionOrMethod() || 3314 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3315 IsLinkageLookup = true; 3316 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3317 IsLinkageLookup = true; 3318 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3319 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3320 IsLinkageLookup = true; 3321 3322 if (IsLinkageLookup) 3323 Previous.clear(LookupRedeclarationWithLinkage); 3324 3325 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3326 } else { // Something like "int foo::x;" 3327 LookupQualifiedName(Previous, DC); 3328 3329 // Don't consider using declarations as previous declarations for 3330 // out-of-line members. 3331 RemoveUsingDecls(Previous); 3332 3333 // C++ 7.3.1.2p2: 3334 // Members (including explicit specializations of templates) of a named 3335 // namespace can also be defined outside that namespace by explicit 3336 // qualification of the name being defined, provided that the entity being 3337 // defined was already declared in the namespace and the definition appears 3338 // after the point of declaration in a namespace that encloses the 3339 // declarations namespace. 3340 // 3341 // Note that we only check the context at this point. We don't yet 3342 // have enough information to make sure that PrevDecl is actually 3343 // the declaration we want to match. For example, given: 3344 // 3345 // class X { 3346 // void f(); 3347 // void f(float); 3348 // }; 3349 // 3350 // void X::f(int) { } // ill-formed 3351 // 3352 // In this case, PrevDecl will point to the overload set 3353 // containing the two f's declared in X, but neither of them 3354 // matches. 3355 3356 // First check whether we named the global scope. 3357 if (isa<TranslationUnitDecl>(DC)) { 3358 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3359 << Name << D.getCXXScopeSpec().getRange(); 3360 } else { 3361 DeclContext *Cur = CurContext; 3362 while (isa<LinkageSpecDecl>(Cur)) 3363 Cur = Cur->getParent(); 3364 if (!Cur->Encloses(DC)) { 3365 // The qualifying scope doesn't enclose the original declaration. 3366 // Emit diagnostic based on current scope. 3367 SourceLocation L = D.getIdentifierLoc(); 3368 SourceRange R = D.getCXXScopeSpec().getRange(); 3369 if (isa<FunctionDecl>(Cur)) 3370 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3371 else 3372 Diag(L, diag::err_invalid_declarator_scope) 3373 << Name << cast<NamedDecl>(DC) << R; 3374 D.setInvalidType(); 3375 } 3376 3377 // C++11 8.3p1: 3378 // ... "The nested-name-specifier of the qualified declarator-id shall 3379 // not begin with a decltype-specifer" 3380 NestedNameSpecifierLoc SpecLoc = 3381 D.getCXXScopeSpec().getWithLocInContext(Context); 3382 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3383 "NestedNameSpecifierLoc"); 3384 while (SpecLoc.getPrefix()) 3385 SpecLoc = SpecLoc.getPrefix(); 3386 if (dyn_cast_or_null<DecltypeType>( 3387 SpecLoc.getNestedNameSpecifier()->getAsType())) 3388 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3389 << SpecLoc.getTypeLoc().getSourceRange(); 3390 } 3391 } 3392 3393 if (Previous.isSingleResult() && 3394 Previous.getFoundDecl()->isTemplateParameter()) { 3395 // Maybe we will complain about the shadowed template parameter. 3396 if (!D.isInvalidType()) 3397 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3398 Previous.getFoundDecl()); 3399 3400 // Just pretend that we didn't see the previous declaration. 3401 Previous.clear(); 3402 } 3403 3404 // In C++, the previous declaration we find might be a tag type 3405 // (class or enum). In this case, the new declaration will hide the 3406 // tag type. Note that this does does not apply if we're declaring a 3407 // typedef (C++ [dcl.typedef]p4). 3408 if (Previous.isSingleTagDecl() && 3409 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3410 Previous.clear(); 3411 3412 bool AddToScope = true; 3413 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3414 if (TemplateParamLists.size()) { 3415 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3416 return 0; 3417 } 3418 3419 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3420 } else if (R->isFunctionType()) { 3421 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3422 move(TemplateParamLists), 3423 AddToScope); 3424 } else { 3425 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3426 move(TemplateParamLists)); 3427 } 3428 3429 if (New == 0) 3430 return 0; 3431 3432 // If this has an identifier and is not an invalid redeclaration or 3433 // function template specialization, add it to the scope stack. 3434 if (New->getDeclName() && AddToScope && 3435 !(D.isRedeclaration() && New->isInvalidDecl())) 3436 PushOnScopeChains(New, S); 3437 3438 return New; 3439} 3440 3441/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3442/// types into constant array types in certain situations which would otherwise 3443/// be errors (for GCC compatibility). 3444static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3445 ASTContext &Context, 3446 bool &SizeIsNegative, 3447 llvm::APSInt &Oversized) { 3448 // This method tries to turn a variable array into a constant 3449 // array even when the size isn't an ICE. This is necessary 3450 // for compatibility with code that depends on gcc's buggy 3451 // constant expression folding, like struct {char x[(int)(char*)2];} 3452 SizeIsNegative = false; 3453 Oversized = 0; 3454 3455 if (T->isDependentType()) 3456 return QualType(); 3457 3458 QualifierCollector Qs; 3459 const Type *Ty = Qs.strip(T); 3460 3461 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3462 QualType Pointee = PTy->getPointeeType(); 3463 QualType FixedType = 3464 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3465 Oversized); 3466 if (FixedType.isNull()) return FixedType; 3467 FixedType = Context.getPointerType(FixedType); 3468 return Qs.apply(Context, FixedType); 3469 } 3470 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3471 QualType Inner = PTy->getInnerType(); 3472 QualType FixedType = 3473 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3474 Oversized); 3475 if (FixedType.isNull()) return FixedType; 3476 FixedType = Context.getParenType(FixedType); 3477 return Qs.apply(Context, FixedType); 3478 } 3479 3480 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3481 if (!VLATy) 3482 return QualType(); 3483 // FIXME: We should probably handle this case 3484 if (VLATy->getElementType()->isVariablyModifiedType()) 3485 return QualType(); 3486 3487 llvm::APSInt Res; 3488 if (!VLATy->getSizeExpr() || 3489 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3490 return QualType(); 3491 3492 // Check whether the array size is negative. 3493 if (Res.isSigned() && Res.isNegative()) { 3494 SizeIsNegative = true; 3495 return QualType(); 3496 } 3497 3498 // Check whether the array is too large to be addressed. 3499 unsigned ActiveSizeBits 3500 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3501 Res); 3502 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3503 Oversized = Res; 3504 return QualType(); 3505 } 3506 3507 return Context.getConstantArrayType(VLATy->getElementType(), 3508 Res, ArrayType::Normal, 0); 3509} 3510 3511/// \brief Register the given locally-scoped external C declaration so 3512/// that it can be found later for redeclarations 3513void 3514Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3515 const LookupResult &Previous, 3516 Scope *S) { 3517 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3518 "Decl is not a locally-scoped decl!"); 3519 // Note that we have a locally-scoped external with this name. 3520 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3521 3522 if (!Previous.isSingleResult()) 3523 return; 3524 3525 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3526 3527 // If there was a previous declaration of this variable, it may be 3528 // in our identifier chain. Update the identifier chain with the new 3529 // declaration. 3530 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3531 // The previous declaration was found on the identifer resolver 3532 // chain, so remove it from its scope. 3533 3534 if (S->isDeclScope(PrevDecl)) { 3535 // Special case for redeclarations in the SAME scope. 3536 // Because this declaration is going to be added to the identifier chain 3537 // later, we should temporarily take it OFF the chain. 3538 IdResolver.RemoveDecl(ND); 3539 3540 } else { 3541 // Find the scope for the original declaration. 3542 while (S && !S->isDeclScope(PrevDecl)) 3543 S = S->getParent(); 3544 } 3545 3546 if (S) 3547 S->RemoveDecl(PrevDecl); 3548 } 3549} 3550 3551llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3552Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3553 if (ExternalSource) { 3554 // Load locally-scoped external decls from the external source. 3555 SmallVector<NamedDecl *, 4> Decls; 3556 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3557 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3558 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3559 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3560 if (Pos == LocallyScopedExternalDecls.end()) 3561 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3562 } 3563 } 3564 3565 return LocallyScopedExternalDecls.find(Name); 3566} 3567 3568/// \brief Diagnose function specifiers on a declaration of an identifier that 3569/// does not identify a function. 3570void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3571 // FIXME: We should probably indicate the identifier in question to avoid 3572 // confusion for constructs like "inline int a(), b;" 3573 if (D.getDeclSpec().isInlineSpecified()) 3574 Diag(D.getDeclSpec().getInlineSpecLoc(), 3575 diag::err_inline_non_function); 3576 3577 if (D.getDeclSpec().isVirtualSpecified()) 3578 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3579 diag::err_virtual_non_function); 3580 3581 if (D.getDeclSpec().isExplicitSpecified()) 3582 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3583 diag::err_explicit_non_function); 3584} 3585 3586NamedDecl* 3587Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3588 TypeSourceInfo *TInfo, LookupResult &Previous) { 3589 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3590 if (D.getCXXScopeSpec().isSet()) { 3591 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3592 << D.getCXXScopeSpec().getRange(); 3593 D.setInvalidType(); 3594 // Pretend we didn't see the scope specifier. 3595 DC = CurContext; 3596 Previous.clear(); 3597 } 3598 3599 if (getLangOptions().CPlusPlus) { 3600 // Check that there are no default arguments (C++ only). 3601 CheckExtraCXXDefaultArguments(D); 3602 } 3603 3604 DiagnoseFunctionSpecifiers(D); 3605 3606 if (D.getDeclSpec().isThreadSpecified()) 3607 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3608 if (D.getDeclSpec().isConstexprSpecified()) 3609 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3610 << 1; 3611 3612 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3613 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3614 << D.getName().getSourceRange(); 3615 return 0; 3616 } 3617 3618 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3619 if (!NewTD) return 0; 3620 3621 // Handle attributes prior to checking for duplicates in MergeVarDecl 3622 ProcessDeclAttributes(S, NewTD, D); 3623 3624 CheckTypedefForVariablyModifiedType(S, NewTD); 3625 3626 bool Redeclaration = D.isRedeclaration(); 3627 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3628 D.setRedeclaration(Redeclaration); 3629 return ND; 3630} 3631 3632void 3633Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3634 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3635 // then it shall have block scope. 3636 // Note that variably modified types must be fixed before merging the decl so 3637 // that redeclarations will match. 3638 QualType T = NewTD->getUnderlyingType(); 3639 if (T->isVariablyModifiedType()) { 3640 getCurFunction()->setHasBranchProtectedScope(); 3641 3642 if (S->getFnParent() == 0) { 3643 bool SizeIsNegative; 3644 llvm::APSInt Oversized; 3645 QualType FixedTy = 3646 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3647 Oversized); 3648 if (!FixedTy.isNull()) { 3649 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3650 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3651 } else { 3652 if (SizeIsNegative) 3653 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3654 else if (T->isVariableArrayType()) 3655 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3656 else if (Oversized.getBoolValue()) 3657 Diag(NewTD->getLocation(), diag::err_array_too_large) 3658 << Oversized.toString(10); 3659 else 3660 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3661 NewTD->setInvalidDecl(); 3662 } 3663 } 3664 } 3665} 3666 3667 3668/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3669/// declares a typedef-name, either using the 'typedef' type specifier or via 3670/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3671NamedDecl* 3672Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3673 LookupResult &Previous, bool &Redeclaration) { 3674 // Merge the decl with the existing one if appropriate. If the decl is 3675 // in an outer scope, it isn't the same thing. 3676 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3677 /*ExplicitInstantiationOrSpecialization=*/false); 3678 if (!Previous.empty()) { 3679 Redeclaration = true; 3680 MergeTypedefNameDecl(NewTD, Previous); 3681 } 3682 3683 // If this is the C FILE type, notify the AST context. 3684 if (IdentifierInfo *II = NewTD->getIdentifier()) 3685 if (!NewTD->isInvalidDecl() && 3686 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3687 if (II->isStr("FILE")) 3688 Context.setFILEDecl(NewTD); 3689 else if (II->isStr("jmp_buf")) 3690 Context.setjmp_bufDecl(NewTD); 3691 else if (II->isStr("sigjmp_buf")) 3692 Context.setsigjmp_bufDecl(NewTD); 3693 else if (II->isStr("ucontext_t")) 3694 Context.setucontext_tDecl(NewTD); 3695 else if (II->isStr("__builtin_va_list")) 3696 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3697 } 3698 3699 return NewTD; 3700} 3701 3702/// \brief Determines whether the given declaration is an out-of-scope 3703/// previous declaration. 3704/// 3705/// This routine should be invoked when name lookup has found a 3706/// previous declaration (PrevDecl) that is not in the scope where a 3707/// new declaration by the same name is being introduced. If the new 3708/// declaration occurs in a local scope, previous declarations with 3709/// linkage may still be considered previous declarations (C99 3710/// 6.2.2p4-5, C++ [basic.link]p6). 3711/// 3712/// \param PrevDecl the previous declaration found by name 3713/// lookup 3714/// 3715/// \param DC the context in which the new declaration is being 3716/// declared. 3717/// 3718/// \returns true if PrevDecl is an out-of-scope previous declaration 3719/// for a new delcaration with the same name. 3720static bool 3721isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3722 ASTContext &Context) { 3723 if (!PrevDecl) 3724 return false; 3725 3726 if (!PrevDecl->hasLinkage()) 3727 return false; 3728 3729 if (Context.getLangOptions().CPlusPlus) { 3730 // C++ [basic.link]p6: 3731 // If there is a visible declaration of an entity with linkage 3732 // having the same name and type, ignoring entities declared 3733 // outside the innermost enclosing namespace scope, the block 3734 // scope declaration declares that same entity and receives the 3735 // linkage of the previous declaration. 3736 DeclContext *OuterContext = DC->getRedeclContext(); 3737 if (!OuterContext->isFunctionOrMethod()) 3738 // This rule only applies to block-scope declarations. 3739 return false; 3740 3741 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3742 if (PrevOuterContext->isRecord()) 3743 // We found a member function: ignore it. 3744 return false; 3745 3746 // Find the innermost enclosing namespace for the new and 3747 // previous declarations. 3748 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3749 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3750 3751 // The previous declaration is in a different namespace, so it 3752 // isn't the same function. 3753 if (!OuterContext->Equals(PrevOuterContext)) 3754 return false; 3755 } 3756 3757 return true; 3758} 3759 3760static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3761 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3762 if (!SS.isSet()) return; 3763 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3764} 3765 3766bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3767 QualType type = decl->getType(); 3768 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3769 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3770 // Various kinds of declaration aren't allowed to be __autoreleasing. 3771 unsigned kind = -1U; 3772 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3773 if (var->hasAttr<BlocksAttr>()) 3774 kind = 0; // __block 3775 else if (!var->hasLocalStorage()) 3776 kind = 1; // global 3777 } else if (isa<ObjCIvarDecl>(decl)) { 3778 kind = 3; // ivar 3779 } else if (isa<FieldDecl>(decl)) { 3780 kind = 2; // field 3781 } 3782 3783 if (kind != -1U) { 3784 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3785 << kind; 3786 } 3787 } else if (lifetime == Qualifiers::OCL_None) { 3788 // Try to infer lifetime. 3789 if (!type->isObjCLifetimeType()) 3790 return false; 3791 3792 lifetime = type->getObjCARCImplicitLifetime(); 3793 type = Context.getLifetimeQualifiedType(type, lifetime); 3794 decl->setType(type); 3795 } 3796 3797 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3798 // Thread-local variables cannot have lifetime. 3799 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3800 var->isThreadSpecified()) { 3801 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3802 << var->getType(); 3803 return true; 3804 } 3805 } 3806 3807 return false; 3808} 3809 3810NamedDecl* 3811Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3812 TypeSourceInfo *TInfo, LookupResult &Previous, 3813 MultiTemplateParamsArg TemplateParamLists) { 3814 QualType R = TInfo->getType(); 3815 DeclarationName Name = GetNameForDeclarator(D).getName(); 3816 3817 // Check that there are no default arguments (C++ only). 3818 if (getLangOptions().CPlusPlus) 3819 CheckExtraCXXDefaultArguments(D); 3820 3821 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3822 assert(SCSpec != DeclSpec::SCS_typedef && 3823 "Parser allowed 'typedef' as storage class VarDecl."); 3824 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3825 if (SCSpec == DeclSpec::SCS_mutable) { 3826 // mutable can only appear on non-static class members, so it's always 3827 // an error here 3828 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3829 D.setInvalidType(); 3830 SC = SC_None; 3831 } 3832 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3833 VarDecl::StorageClass SCAsWritten 3834 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3835 3836 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3837 if (!II) { 3838 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3839 << Name; 3840 return 0; 3841 } 3842 3843 DiagnoseFunctionSpecifiers(D); 3844 3845 if (!DC->isRecord() && S->getFnParent() == 0) { 3846 // C99 6.9p2: The storage-class specifiers auto and register shall not 3847 // appear in the declaration specifiers in an external declaration. 3848 if (SC == SC_Auto || SC == SC_Register) { 3849 3850 // If this is a register variable with an asm label specified, then this 3851 // is a GNU extension. 3852 if (SC == SC_Register && D.getAsmLabel()) 3853 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3854 else 3855 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3856 D.setInvalidType(); 3857 } 3858 } 3859 3860 if (getLangOptions().OpenCL) { 3861 // Set up the special work-group-local storage class for variables in the 3862 // OpenCL __local address space. 3863 if (R.getAddressSpace() == LangAS::opencl_local) 3864 SC = SC_OpenCLWorkGroupLocal; 3865 } 3866 3867 bool isExplicitSpecialization = false; 3868 VarDecl *NewVD; 3869 if (!getLangOptions().CPlusPlus) { 3870 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3871 D.getIdentifierLoc(), II, 3872 R, TInfo, SC, SCAsWritten); 3873 3874 if (D.isInvalidType()) 3875 NewVD->setInvalidDecl(); 3876 } else { 3877 if (DC->isRecord() && !CurContext->isRecord()) { 3878 // This is an out-of-line definition of a static data member. 3879 if (SC == SC_Static) { 3880 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3881 diag::err_static_out_of_line) 3882 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3883 } else if (SC == SC_None) 3884 SC = SC_Static; 3885 } 3886 if (SC == SC_Static) { 3887 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3888 if (RD->isLocalClass()) 3889 Diag(D.getIdentifierLoc(), 3890 diag::err_static_data_member_not_allowed_in_local_class) 3891 << Name << RD->getDeclName(); 3892 3893 // C++ [class.union]p1: If a union contains a static data member, 3894 // the program is ill-formed. 3895 // 3896 // We also disallow static data members in anonymous structs. 3897 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3898 Diag(D.getIdentifierLoc(), 3899 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3900 << Name << RD->isUnion(); 3901 } 3902 } 3903 3904 // Match up the template parameter lists with the scope specifier, then 3905 // determine whether we have a template or a template specialization. 3906 isExplicitSpecialization = false; 3907 bool Invalid = false; 3908 if (TemplateParameterList *TemplateParams 3909 = MatchTemplateParametersToScopeSpecifier( 3910 D.getDeclSpec().getSourceRange().getBegin(), 3911 D.getIdentifierLoc(), 3912 D.getCXXScopeSpec(), 3913 TemplateParamLists.get(), 3914 TemplateParamLists.size(), 3915 /*never a friend*/ false, 3916 isExplicitSpecialization, 3917 Invalid)) { 3918 if (TemplateParams->size() > 0) { 3919 // There is no such thing as a variable template. 3920 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3921 << II 3922 << SourceRange(TemplateParams->getTemplateLoc(), 3923 TemplateParams->getRAngleLoc()); 3924 return 0; 3925 } else { 3926 // There is an extraneous 'template<>' for this variable. Complain 3927 // about it, but allow the declaration of the variable. 3928 Diag(TemplateParams->getTemplateLoc(), 3929 diag::err_template_variable_noparams) 3930 << II 3931 << SourceRange(TemplateParams->getTemplateLoc(), 3932 TemplateParams->getRAngleLoc()); 3933 } 3934 } 3935 3936 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3937 D.getIdentifierLoc(), II, 3938 R, TInfo, SC, SCAsWritten); 3939 3940 // If this decl has an auto type in need of deduction, make a note of the 3941 // Decl so we can diagnose uses of it in its own initializer. 3942 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3943 R->getContainedAutoType()) 3944 ParsingInitForAutoVars.insert(NewVD); 3945 3946 if (D.isInvalidType() || Invalid) 3947 NewVD->setInvalidDecl(); 3948 3949 SetNestedNameSpecifier(NewVD, D); 3950 3951 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3952 NewVD->setTemplateParameterListsInfo(Context, 3953 TemplateParamLists.size(), 3954 TemplateParamLists.release()); 3955 } 3956 3957 if (D.getDeclSpec().isConstexprSpecified()) 3958 NewVD->setConstexpr(true); 3959 } 3960 3961 // Set the lexical context. If the declarator has a C++ scope specifier, the 3962 // lexical context will be different from the semantic context. 3963 NewVD->setLexicalDeclContext(CurContext); 3964 3965 if (D.getDeclSpec().isThreadSpecified()) { 3966 if (NewVD->hasLocalStorage()) 3967 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3968 else if (!Context.getTargetInfo().isTLSSupported()) 3969 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3970 else 3971 NewVD->setThreadSpecified(true); 3972 } 3973 3974 if (D.getDeclSpec().isModulePrivateSpecified()) { 3975 if (isExplicitSpecialization) 3976 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3977 << 2 3978 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3979 else if (NewVD->hasLocalStorage()) 3980 Diag(NewVD->getLocation(), diag::err_module_private_local) 3981 << 0 << NewVD->getDeclName() 3982 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3983 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3984 else 3985 NewVD->setModulePrivate(); 3986 } 3987 3988 // Handle attributes prior to checking for duplicates in MergeVarDecl 3989 ProcessDeclAttributes(S, NewVD, D); 3990 3991 // In auto-retain/release, infer strong retension for variables of 3992 // retainable type. 3993 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3994 NewVD->setInvalidDecl(); 3995 3996 // Handle GNU asm-label extension (encoded as an attribute). 3997 if (Expr *E = (Expr*)D.getAsmLabel()) { 3998 // The parser guarantees this is a string. 3999 StringLiteral *SE = cast<StringLiteral>(E); 4000 StringRef Label = SE->getString(); 4001 if (S->getFnParent() != 0) { 4002 switch (SC) { 4003 case SC_None: 4004 case SC_Auto: 4005 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4006 break; 4007 case SC_Register: 4008 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4009 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4010 break; 4011 case SC_Static: 4012 case SC_Extern: 4013 case SC_PrivateExtern: 4014 case SC_OpenCLWorkGroupLocal: 4015 break; 4016 } 4017 } 4018 4019 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4020 Context, Label)); 4021 } 4022 4023 // Diagnose shadowed variables before filtering for scope. 4024 if (!D.getCXXScopeSpec().isSet()) 4025 CheckShadow(S, NewVD, Previous); 4026 4027 // Don't consider existing declarations that are in a different 4028 // scope and are out-of-semantic-context declarations (if the new 4029 // declaration has linkage). 4030 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4031 isExplicitSpecialization); 4032 4033 if (!getLangOptions().CPlusPlus) { 4034 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4035 } else { 4036 // Merge the decl with the existing one if appropriate. 4037 if (!Previous.empty()) { 4038 if (Previous.isSingleResult() && 4039 isa<FieldDecl>(Previous.getFoundDecl()) && 4040 D.getCXXScopeSpec().isSet()) { 4041 // The user tried to define a non-static data member 4042 // out-of-line (C++ [dcl.meaning]p1). 4043 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4044 << D.getCXXScopeSpec().getRange(); 4045 Previous.clear(); 4046 NewVD->setInvalidDecl(); 4047 } 4048 } else if (D.getCXXScopeSpec().isSet()) { 4049 // No previous declaration in the qualifying scope. 4050 Diag(D.getIdentifierLoc(), diag::err_no_member) 4051 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4052 << D.getCXXScopeSpec().getRange(); 4053 NewVD->setInvalidDecl(); 4054 } 4055 4056 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4057 4058 // This is an explicit specialization of a static data member. Check it. 4059 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4060 CheckMemberSpecialization(NewVD, Previous)) 4061 NewVD->setInvalidDecl(); 4062 } 4063 4064 // attributes declared post-definition are currently ignored 4065 // FIXME: This should be handled in attribute merging, not 4066 // here. 4067 if (Previous.isSingleResult()) { 4068 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4069 if (Def && (Def = Def->getDefinition()) && 4070 Def != NewVD && D.hasAttributes()) { 4071 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4072 Diag(Def->getLocation(), diag::note_previous_definition); 4073 } 4074 } 4075 4076 // If this is a locally-scoped extern C variable, update the map of 4077 // such variables. 4078 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4079 !NewVD->isInvalidDecl()) 4080 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4081 4082 // If there's a #pragma GCC visibility in scope, and this isn't a class 4083 // member, set the visibility of this variable. 4084 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4085 AddPushedVisibilityAttribute(NewVD); 4086 4087 MarkUnusedFileScopedDecl(NewVD); 4088 4089 return NewVD; 4090} 4091 4092/// \brief Diagnose variable or built-in function shadowing. Implements 4093/// -Wshadow. 4094/// 4095/// This method is called whenever a VarDecl is added to a "useful" 4096/// scope. 4097/// 4098/// \param S the scope in which the shadowing name is being declared 4099/// \param R the lookup of the name 4100/// 4101void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4102 // Return if warning is ignored. 4103 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4104 DiagnosticsEngine::Ignored) 4105 return; 4106 4107 // Don't diagnose declarations at file scope. 4108 if (D->hasGlobalStorage()) 4109 return; 4110 4111 DeclContext *NewDC = D->getDeclContext(); 4112 4113 // Only diagnose if we're shadowing an unambiguous field or variable. 4114 if (R.getResultKind() != LookupResult::Found) 4115 return; 4116 4117 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4118 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4119 return; 4120 4121 // Fields are not shadowed by variables in C++ static methods. 4122 if (isa<FieldDecl>(ShadowedDecl)) 4123 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4124 if (MD->isStatic()) 4125 return; 4126 4127 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4128 if (shadowedVar->isExternC()) { 4129 // For shadowing external vars, make sure that we point to the global 4130 // declaration, not a locally scoped extern declaration. 4131 for (VarDecl::redecl_iterator 4132 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4133 I != E; ++I) 4134 if (I->isFileVarDecl()) { 4135 ShadowedDecl = *I; 4136 break; 4137 } 4138 } 4139 4140 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4141 4142 // Only warn about certain kinds of shadowing for class members. 4143 if (NewDC && NewDC->isRecord()) { 4144 // In particular, don't warn about shadowing non-class members. 4145 if (!OldDC->isRecord()) 4146 return; 4147 4148 // TODO: should we warn about static data members shadowing 4149 // static data members from base classes? 4150 4151 // TODO: don't diagnose for inaccessible shadowed members. 4152 // This is hard to do perfectly because we might friend the 4153 // shadowing context, but that's just a false negative. 4154 } 4155 4156 // Determine what kind of declaration we're shadowing. 4157 unsigned Kind; 4158 if (isa<RecordDecl>(OldDC)) { 4159 if (isa<FieldDecl>(ShadowedDecl)) 4160 Kind = 3; // field 4161 else 4162 Kind = 2; // static data member 4163 } else if (OldDC->isFileContext()) 4164 Kind = 1; // global 4165 else 4166 Kind = 0; // local 4167 4168 DeclarationName Name = R.getLookupName(); 4169 4170 // Emit warning and note. 4171 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4172 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4173} 4174 4175/// \brief Check -Wshadow without the advantage of a previous lookup. 4176void Sema::CheckShadow(Scope *S, VarDecl *D) { 4177 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4178 DiagnosticsEngine::Ignored) 4179 return; 4180 4181 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4182 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4183 LookupName(R, S); 4184 CheckShadow(S, D, R); 4185} 4186 4187/// \brief Perform semantic checking on a newly-created variable 4188/// declaration. 4189/// 4190/// This routine performs all of the type-checking required for a 4191/// variable declaration once it has been built. It is used both to 4192/// check variables after they have been parsed and their declarators 4193/// have been translated into a declaration, and to check variables 4194/// that have been instantiated from a template. 4195/// 4196/// Sets NewVD->isInvalidDecl() if an error was encountered. 4197/// 4198/// Returns true if the variable declaration is a redeclaration. 4199bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4200 LookupResult &Previous) { 4201 // If the decl is already known invalid, don't check it. 4202 if (NewVD->isInvalidDecl()) 4203 return false; 4204 4205 QualType T = NewVD->getType(); 4206 4207 if (T->isObjCObjectType()) { 4208 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4209 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4210 T = Context.getObjCObjectPointerType(T); 4211 NewVD->setType(T); 4212 } 4213 4214 // Emit an error if an address space was applied to decl with local storage. 4215 // This includes arrays of objects with address space qualifiers, but not 4216 // automatic variables that point to other address spaces. 4217 // ISO/IEC TR 18037 S5.1.2 4218 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4219 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4220 NewVD->setInvalidDecl(); 4221 return false; 4222 } 4223 4224 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4225 && !NewVD->hasAttr<BlocksAttr>()) { 4226 if (getLangOptions().getGC() != LangOptions::NonGC) 4227 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4228 else 4229 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4230 } 4231 4232 bool isVM = T->isVariablyModifiedType(); 4233 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4234 NewVD->hasAttr<BlocksAttr>()) 4235 getCurFunction()->setHasBranchProtectedScope(); 4236 4237 if ((isVM && NewVD->hasLinkage()) || 4238 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4239 bool SizeIsNegative; 4240 llvm::APSInt Oversized; 4241 QualType FixedTy = 4242 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4243 Oversized); 4244 4245 if (FixedTy.isNull() && T->isVariableArrayType()) { 4246 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4247 // FIXME: This won't give the correct result for 4248 // int a[10][n]; 4249 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4250 4251 if (NewVD->isFileVarDecl()) 4252 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4253 << SizeRange; 4254 else if (NewVD->getStorageClass() == SC_Static) 4255 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4256 << SizeRange; 4257 else 4258 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4259 << SizeRange; 4260 NewVD->setInvalidDecl(); 4261 return false; 4262 } 4263 4264 if (FixedTy.isNull()) { 4265 if (NewVD->isFileVarDecl()) 4266 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4267 else 4268 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4269 NewVD->setInvalidDecl(); 4270 return false; 4271 } 4272 4273 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4274 NewVD->setType(FixedTy); 4275 } 4276 4277 if (Previous.empty() && NewVD->isExternC()) { 4278 // Since we did not find anything by this name and we're declaring 4279 // an extern "C" variable, look for a non-visible extern "C" 4280 // declaration with the same name. 4281 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4282 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4283 if (Pos != LocallyScopedExternalDecls.end()) 4284 Previous.addDecl(Pos->second); 4285 } 4286 4287 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4288 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4289 << T; 4290 NewVD->setInvalidDecl(); 4291 return false; 4292 } 4293 4294 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4295 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4296 NewVD->setInvalidDecl(); 4297 return false; 4298 } 4299 4300 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4301 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4302 NewVD->setInvalidDecl(); 4303 return false; 4304 } 4305 4306 // Function pointers and references cannot have qualified function type, only 4307 // function pointer-to-members can do that. 4308 QualType Pointee; 4309 unsigned PtrOrRef = 0; 4310 if (const PointerType *Ptr = T->getAs<PointerType>()) 4311 Pointee = Ptr->getPointeeType(); 4312 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4313 Pointee = Ref->getPointeeType(); 4314 PtrOrRef = 1; 4315 } 4316 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4317 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4318 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4319 << PtrOrRef; 4320 NewVD->setInvalidDecl(); 4321 return false; 4322 } 4323 4324 if (!Previous.empty()) { 4325 MergeVarDecl(NewVD, Previous); 4326 return true; 4327 } 4328 return false; 4329} 4330 4331/// \brief Data used with FindOverriddenMethod 4332struct FindOverriddenMethodData { 4333 Sema *S; 4334 CXXMethodDecl *Method; 4335}; 4336 4337/// \brief Member lookup function that determines whether a given C++ 4338/// method overrides a method in a base class, to be used with 4339/// CXXRecordDecl::lookupInBases(). 4340static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4341 CXXBasePath &Path, 4342 void *UserData) { 4343 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4344 4345 FindOverriddenMethodData *Data 4346 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4347 4348 DeclarationName Name = Data->Method->getDeclName(); 4349 4350 // FIXME: Do we care about other names here too? 4351 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4352 // We really want to find the base class destructor here. 4353 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4354 CanQualType CT = Data->S->Context.getCanonicalType(T); 4355 4356 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4357 } 4358 4359 for (Path.Decls = BaseRecord->lookup(Name); 4360 Path.Decls.first != Path.Decls.second; 4361 ++Path.Decls.first) { 4362 NamedDecl *D = *Path.Decls.first; 4363 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4364 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4365 return true; 4366 } 4367 } 4368 4369 return false; 4370} 4371 4372/// AddOverriddenMethods - See if a method overrides any in the base classes, 4373/// and if so, check that it's a valid override and remember it. 4374bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4375 // Look for virtual methods in base classes that this method might override. 4376 CXXBasePaths Paths; 4377 FindOverriddenMethodData Data; 4378 Data.Method = MD; 4379 Data.S = this; 4380 bool AddedAny = false; 4381 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4382 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4383 E = Paths.found_decls_end(); I != E; ++I) { 4384 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4385 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4386 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4387 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4388 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4389 AddedAny = true; 4390 } 4391 } 4392 } 4393 } 4394 4395 return AddedAny; 4396} 4397 4398namespace { 4399 // Struct for holding all of the extra arguments needed by 4400 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4401 struct ActOnFDArgs { 4402 Scope *S; 4403 Declarator &D; 4404 MultiTemplateParamsArg TemplateParamLists; 4405 bool AddToScope; 4406 }; 4407} 4408 4409/// \brief Generate diagnostics for an invalid function redeclaration. 4410/// 4411/// This routine handles generating the diagnostic messages for an invalid 4412/// function redeclaration, including finding possible similar declarations 4413/// or performing typo correction if there are no previous declarations with 4414/// the same name. 4415/// 4416/// Returns a NamedDecl iff typo correction was performed and substituting in 4417/// the new declaration name does not cause new errors. 4418static NamedDecl* DiagnoseInvalidRedeclaration( 4419 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4420 ActOnFDArgs &ExtraArgs) { 4421 NamedDecl *Result = NULL; 4422 DeclarationName Name = NewFD->getDeclName(); 4423 DeclContext *NewDC = NewFD->getDeclContext(); 4424 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4425 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4426 llvm::SmallVector<unsigned, 1> MismatchedParams; 4427 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4428 TypoCorrection Correction; 4429 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4430 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4431 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4432 : diag::err_member_def_does_not_match; 4433 4434 NewFD->setInvalidDecl(); 4435 SemaRef.LookupQualifiedName(Prev, NewDC); 4436 assert(!Prev.isAmbiguous() && 4437 "Cannot have an ambiguity in previous-declaration lookup"); 4438 if (!Prev.empty()) { 4439 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4440 Func != FuncEnd; ++Func) { 4441 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4442 if (FD && 4443 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4444 // Add 1 to the index so that 0 can mean the mismatch didn't 4445 // involve a parameter 4446 unsigned ParamNum = 4447 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4448 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4449 } 4450 } 4451 // If the qualified name lookup yielded nothing, try typo correction 4452 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4453 Prev.getLookupKind(), 0, 0, NewDC)) && 4454 Correction.getCorrection() != Name) { 4455 // Trap errors. 4456 Sema::SFINAETrap Trap(SemaRef); 4457 4458 // Set up everything for the call to ActOnFunctionDeclarator 4459 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4460 ExtraArgs.D.getIdentifierLoc()); 4461 Previous.clear(); 4462 Previous.setLookupName(Correction.getCorrection()); 4463 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4464 CDeclEnd = Correction.end(); 4465 CDecl != CDeclEnd; ++CDecl) { 4466 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4467 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4468 MismatchedParams)) { 4469 Previous.addDecl(FD); 4470 } 4471 } 4472 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4473 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4474 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4475 // eliminate the need for the parameter pack ExtraArgs. 4476 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4477 NewFD->getDeclContext(), 4478 NewFD->getTypeSourceInfo(), 4479 Previous, 4480 ExtraArgs.TemplateParamLists, 4481 ExtraArgs.AddToScope); 4482 if (Trap.hasErrorOccurred()) { 4483 // Pretend the typo correction never occurred 4484 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4485 ExtraArgs.D.getIdentifierLoc()); 4486 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4487 Previous.clear(); 4488 Previous.setLookupName(Name); 4489 Result = NULL; 4490 } else { 4491 for (LookupResult::iterator Func = Previous.begin(), 4492 FuncEnd = Previous.end(); 4493 Func != FuncEnd; ++Func) { 4494 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4495 NearMatches.push_back(std::make_pair(FD, 0)); 4496 } 4497 } 4498 if (NearMatches.empty()) { 4499 // Ignore the correction if it didn't yield any close FunctionDecl matches 4500 Correction = TypoCorrection(); 4501 } else { 4502 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4503 : diag::err_member_def_does_not_match_suggest; 4504 } 4505 } 4506 4507 if (Correction) 4508 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4509 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4510 << FixItHint::CreateReplacement( 4511 NewFD->getLocation(), 4512 Correction.getAsString(SemaRef.getLangOptions())); 4513 else 4514 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4515 << Name << NewDC << NewFD->getLocation(); 4516 4517 bool NewFDisConst = false; 4518 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4519 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4520 4521 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4522 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4523 NearMatch != NearMatchEnd; ++NearMatch) { 4524 FunctionDecl *FD = NearMatch->first; 4525 bool FDisConst = false; 4526 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4527 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4528 4529 if (unsigned Idx = NearMatch->second) { 4530 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4531 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4532 diag::note_member_def_close_param_match) 4533 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4534 } else if (Correction) { 4535 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4536 << Correction.getQuoted(SemaRef.getLangOptions()); 4537 } else if (FDisConst != NewFDisConst) { 4538 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4539 << NewFDisConst << FD->getSourceRange().getEnd(); 4540 } else 4541 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4542 } 4543 return Result; 4544} 4545 4546static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4547 Declarator &D) { 4548 switch (D.getDeclSpec().getStorageClassSpec()) { 4549 default: llvm_unreachable("Unknown storage class!"); 4550 case DeclSpec::SCS_auto: 4551 case DeclSpec::SCS_register: 4552 case DeclSpec::SCS_mutable: 4553 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4554 diag::err_typecheck_sclass_func); 4555 D.setInvalidType(); 4556 break; 4557 case DeclSpec::SCS_unspecified: break; 4558 case DeclSpec::SCS_extern: return SC_Extern; 4559 case DeclSpec::SCS_static: { 4560 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4561 // C99 6.7.1p5: 4562 // The declaration of an identifier for a function that has 4563 // block scope shall have no explicit storage-class specifier 4564 // other than extern 4565 // See also (C++ [dcl.stc]p4). 4566 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4567 diag::err_static_block_func); 4568 break; 4569 } else 4570 return SC_Static; 4571 } 4572 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4573 } 4574 4575 // No explicit storage class has already been returned 4576 return SC_None; 4577} 4578 4579static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4580 DeclContext *DC, QualType &R, 4581 TypeSourceInfo *TInfo, 4582 FunctionDecl::StorageClass SC, 4583 bool &IsVirtualOkay) { 4584 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4585 DeclarationName Name = NameInfo.getName(); 4586 4587 FunctionDecl *NewFD = 0; 4588 bool isInline = D.getDeclSpec().isInlineSpecified(); 4589 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4590 FunctionDecl::StorageClass SCAsWritten 4591 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4592 4593 if (!SemaRef.getLangOptions().CPlusPlus) { 4594 // Determine whether the function was written with a 4595 // prototype. This true when: 4596 // - there is a prototype in the declarator, or 4597 // - the type R of the function is some kind of typedef or other reference 4598 // to a type name (which eventually refers to a function type). 4599 bool HasPrototype = 4600 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4601 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4602 4603 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4604 D.getSourceRange().getBegin(), NameInfo, R, 4605 TInfo, SC, SCAsWritten, isInline, 4606 HasPrototype); 4607 if (D.isInvalidType()) 4608 NewFD->setInvalidDecl(); 4609 4610 // Set the lexical context. 4611 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4612 4613 return NewFD; 4614 } 4615 4616 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4617 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4618 4619 // Check that the return type is not an abstract class type. 4620 // For record types, this is done by the AbstractClassUsageDiagnoser once 4621 // the class has been completely parsed. 4622 if (!DC->isRecord() && 4623 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4624 R->getAs<FunctionType>()->getResultType(), 4625 diag::err_abstract_type_in_decl, 4626 SemaRef.AbstractReturnType)) 4627 D.setInvalidType(); 4628 4629 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4630 // This is a C++ constructor declaration. 4631 assert(DC->isRecord() && 4632 "Constructors can only be declared in a member context"); 4633 4634 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4635 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4636 D.getSourceRange().getBegin(), NameInfo, 4637 R, TInfo, isExplicit, isInline, 4638 /*isImplicitlyDeclared=*/false, 4639 isConstexpr); 4640 4641 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4642 // This is a C++ destructor declaration. 4643 if (DC->isRecord()) { 4644 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4645 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4646 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4647 SemaRef.Context, Record, 4648 D.getSourceRange().getBegin(), 4649 NameInfo, R, TInfo, isInline, 4650 /*isImplicitlyDeclared=*/false); 4651 4652 // If the class is complete, then we now create the implicit exception 4653 // specification. If the class is incomplete or dependent, we can't do 4654 // it yet. 4655 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4656 Record->getDefinition() && !Record->isBeingDefined() && 4657 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4658 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4659 } 4660 4661 IsVirtualOkay = true; 4662 return NewDD; 4663 4664 } else { 4665 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4666 D.setInvalidType(); 4667 4668 // Create a FunctionDecl to satisfy the function definition parsing 4669 // code path. 4670 return FunctionDecl::Create(SemaRef.Context, DC, 4671 D.getSourceRange().getBegin(), 4672 D.getIdentifierLoc(), Name, R, TInfo, 4673 SC, SCAsWritten, isInline, 4674 /*hasPrototype=*/true, isConstexpr); 4675 } 4676 4677 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4678 if (!DC->isRecord()) { 4679 SemaRef.Diag(D.getIdentifierLoc(), 4680 diag::err_conv_function_not_member); 4681 return 0; 4682 } 4683 4684 SemaRef.CheckConversionDeclarator(D, R, SC); 4685 IsVirtualOkay = true; 4686 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4687 D.getSourceRange().getBegin(), NameInfo, 4688 R, TInfo, isInline, isExplicit, 4689 isConstexpr, SourceLocation()); 4690 4691 } else if (DC->isRecord()) { 4692 // If the name of the function is the same as the name of the record, 4693 // then this must be an invalid constructor that has a return type. 4694 // (The parser checks for a return type and makes the declarator a 4695 // constructor if it has no return type). 4696 if (Name.getAsIdentifierInfo() && 4697 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4698 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4699 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4700 << SourceRange(D.getIdentifierLoc()); 4701 return 0; 4702 } 4703 4704 bool isStatic = SC == SC_Static; 4705 4706 // [class.free]p1: 4707 // Any allocation function for a class T is a static member 4708 // (even if not explicitly declared static). 4709 if (Name.getCXXOverloadedOperator() == OO_New || 4710 Name.getCXXOverloadedOperator() == OO_Array_New) 4711 isStatic = true; 4712 4713 // [class.free]p6 Any deallocation function for a class X is a static member 4714 // (even if not explicitly declared static). 4715 if (Name.getCXXOverloadedOperator() == OO_Delete || 4716 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4717 isStatic = true; 4718 4719 IsVirtualOkay = !isStatic; 4720 4721 // This is a C++ method declaration. 4722 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4723 D.getSourceRange().getBegin(), NameInfo, R, 4724 TInfo, isStatic, SCAsWritten, isInline, 4725 isConstexpr, SourceLocation()); 4726 4727 } else { 4728 // Determine whether the function was written with a 4729 // prototype. This true when: 4730 // - we're in C++ (where every function has a prototype), 4731 return FunctionDecl::Create(SemaRef.Context, DC, 4732 D.getSourceRange().getBegin(), 4733 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4734 true/*HasPrototype*/, isConstexpr); 4735 } 4736} 4737 4738NamedDecl* 4739Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4740 TypeSourceInfo *TInfo, LookupResult &Previous, 4741 MultiTemplateParamsArg TemplateParamLists, 4742 bool &AddToScope) { 4743 QualType R = TInfo->getType(); 4744 4745 assert(R.getTypePtr()->isFunctionType()); 4746 4747 // TODO: consider using NameInfo for diagnostic. 4748 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4749 DeclarationName Name = NameInfo.getName(); 4750 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4751 4752 if (D.getDeclSpec().isThreadSpecified()) 4753 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4754 4755 // Do not allow returning a objc interface by-value. 4756 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4757 Diag(D.getIdentifierLoc(), 4758 diag::err_object_cannot_be_passed_returned_by_value) << 0 4759 << R->getAs<FunctionType>()->getResultType() 4760 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4761 4762 QualType T = R->getAs<FunctionType>()->getResultType(); 4763 T = Context.getObjCObjectPointerType(T); 4764 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4765 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4766 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4767 FPT->getNumArgs(), EPI); 4768 } 4769 else if (isa<FunctionNoProtoType>(R)) 4770 R = Context.getFunctionNoProtoType(T); 4771 } 4772 4773 bool isFriend = false; 4774 FunctionTemplateDecl *FunctionTemplate = 0; 4775 bool isExplicitSpecialization = false; 4776 bool isFunctionTemplateSpecialization = false; 4777 bool isDependentClassScopeExplicitSpecialization = false; 4778 bool isVirtualOkay = false; 4779 4780 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4781 isVirtualOkay); 4782 if (!NewFD) return 0; 4783 4784 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4785 NewFD->setTopLevelDeclInObjCContainer(); 4786 4787 if (getLangOptions().CPlusPlus) { 4788 bool isInline = D.getDeclSpec().isInlineSpecified(); 4789 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4790 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4791 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4792 isFriend = D.getDeclSpec().isFriendSpecified(); 4793 if (isFriend && !isInline && D.isFunctionDefinition()) { 4794 // C++ [class.friend]p5 4795 // A function can be defined in a friend declaration of a 4796 // class . . . . Such a function is implicitly inline. 4797 NewFD->setImplicitlyInline(); 4798 } 4799 4800 SetNestedNameSpecifier(NewFD, D); 4801 isExplicitSpecialization = false; 4802 isFunctionTemplateSpecialization = false; 4803 if (D.isInvalidType()) 4804 NewFD->setInvalidDecl(); 4805 4806 // Set the lexical context. If the declarator has a C++ 4807 // scope specifier, or is the object of a friend declaration, the 4808 // lexical context will be different from the semantic context. 4809 NewFD->setLexicalDeclContext(CurContext); 4810 4811 // Match up the template parameter lists with the scope specifier, then 4812 // determine whether we have a template or a template specialization. 4813 bool Invalid = false; 4814 if (TemplateParameterList *TemplateParams 4815 = MatchTemplateParametersToScopeSpecifier( 4816 D.getDeclSpec().getSourceRange().getBegin(), 4817 D.getIdentifierLoc(), 4818 D.getCXXScopeSpec(), 4819 TemplateParamLists.get(), 4820 TemplateParamLists.size(), 4821 isFriend, 4822 isExplicitSpecialization, 4823 Invalid)) { 4824 if (TemplateParams->size() > 0) { 4825 // This is a function template 4826 4827 // Check that we can declare a template here. 4828 if (CheckTemplateDeclScope(S, TemplateParams)) 4829 return 0; 4830 4831 // A destructor cannot be a template. 4832 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4833 Diag(NewFD->getLocation(), diag::err_destructor_template); 4834 return 0; 4835 } 4836 4837 // If we're adding a template to a dependent context, we may need to 4838 // rebuilding some of the types used within the template parameter list, 4839 // now that we know what the current instantiation is. 4840 if (DC->isDependentContext()) { 4841 ContextRAII SavedContext(*this, DC); 4842 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4843 Invalid = true; 4844 } 4845 4846 4847 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4848 NewFD->getLocation(), 4849 Name, TemplateParams, 4850 NewFD); 4851 FunctionTemplate->setLexicalDeclContext(CurContext); 4852 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4853 4854 // For source fidelity, store the other template param lists. 4855 if (TemplateParamLists.size() > 1) { 4856 NewFD->setTemplateParameterListsInfo(Context, 4857 TemplateParamLists.size() - 1, 4858 TemplateParamLists.release()); 4859 } 4860 } else { 4861 // This is a function template specialization. 4862 isFunctionTemplateSpecialization = true; 4863 // For source fidelity, store all the template param lists. 4864 NewFD->setTemplateParameterListsInfo(Context, 4865 TemplateParamLists.size(), 4866 TemplateParamLists.release()); 4867 4868 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4869 if (isFriend) { 4870 // We want to remove the "template<>", found here. 4871 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4872 4873 // If we remove the template<> and the name is not a 4874 // template-id, we're actually silently creating a problem: 4875 // the friend declaration will refer to an untemplated decl, 4876 // and clearly the user wants a template specialization. So 4877 // we need to insert '<>' after the name. 4878 SourceLocation InsertLoc; 4879 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4880 InsertLoc = D.getName().getSourceRange().getEnd(); 4881 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4882 } 4883 4884 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4885 << Name << RemoveRange 4886 << FixItHint::CreateRemoval(RemoveRange) 4887 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4888 } 4889 } 4890 } 4891 else { 4892 // All template param lists were matched against the scope specifier: 4893 // this is NOT (an explicit specialization of) a template. 4894 if (TemplateParamLists.size() > 0) 4895 // For source fidelity, store all the template param lists. 4896 NewFD->setTemplateParameterListsInfo(Context, 4897 TemplateParamLists.size(), 4898 TemplateParamLists.release()); 4899 } 4900 4901 if (Invalid) { 4902 NewFD->setInvalidDecl(); 4903 if (FunctionTemplate) 4904 FunctionTemplate->setInvalidDecl(); 4905 } 4906 4907 // C++ [dcl.fct.spec]p5: 4908 // The virtual specifier shall only be used in declarations of 4909 // nonstatic class member functions that appear within a 4910 // member-specification of a class declaration; see 10.3. 4911 // 4912 if (isVirtual && !NewFD->isInvalidDecl()) { 4913 if (!isVirtualOkay) { 4914 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4915 diag::err_virtual_non_function); 4916 } else if (!CurContext->isRecord()) { 4917 // 'virtual' was specified outside of the class. 4918 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4919 diag::err_virtual_out_of_class) 4920 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4921 } else if (NewFD->getDescribedFunctionTemplate()) { 4922 // C++ [temp.mem]p3: 4923 // A member function template shall not be virtual. 4924 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4925 diag::err_virtual_member_function_template) 4926 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4927 } else { 4928 // Okay: Add virtual to the method. 4929 NewFD->setVirtualAsWritten(true); 4930 } 4931 } 4932 4933 // C++ [dcl.fct.spec]p3: 4934 // The inline specifier shall not appear on a block scope function 4935 // declaration. 4936 if (isInline && !NewFD->isInvalidDecl()) { 4937 if (CurContext->isFunctionOrMethod()) { 4938 // 'inline' is not allowed on block scope function declaration. 4939 Diag(D.getDeclSpec().getInlineSpecLoc(), 4940 diag::err_inline_declaration_block_scope) << Name 4941 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4942 } 4943 } 4944 4945 // C++ [dcl.fct.spec]p6: 4946 // The explicit specifier shall be used only in the declaration of a 4947 // constructor or conversion function within its class definition; 4948 // see 12.3.1 and 12.3.2. 4949 if (isExplicit && !NewFD->isInvalidDecl()) { 4950 if (!CurContext->isRecord()) { 4951 // 'explicit' was specified outside of the class. 4952 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4953 diag::err_explicit_out_of_class) 4954 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4955 } else if (!isa<CXXConstructorDecl>(NewFD) && 4956 !isa<CXXConversionDecl>(NewFD)) { 4957 // 'explicit' was specified on a function that wasn't a constructor 4958 // or conversion function. 4959 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4960 diag::err_explicit_non_ctor_or_conv_function) 4961 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4962 } 4963 } 4964 4965 if (isConstexpr) { 4966 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4967 // are implicitly inline. 4968 NewFD->setImplicitlyInline(); 4969 4970 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4971 // be either constructors or to return a literal type. Therefore, 4972 // destructors cannot be declared constexpr. 4973 if (isa<CXXDestructorDecl>(NewFD)) 4974 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4975 } 4976 4977 // If __module_private__ was specified, mark the function accordingly. 4978 if (D.getDeclSpec().isModulePrivateSpecified()) { 4979 if (isFunctionTemplateSpecialization) { 4980 SourceLocation ModulePrivateLoc 4981 = D.getDeclSpec().getModulePrivateSpecLoc(); 4982 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4983 << 0 4984 << FixItHint::CreateRemoval(ModulePrivateLoc); 4985 } else { 4986 NewFD->setModulePrivate(); 4987 if (FunctionTemplate) 4988 FunctionTemplate->setModulePrivate(); 4989 } 4990 } 4991 4992 if (isFriend) { 4993 // For now, claim that the objects have no previous declaration. 4994 if (FunctionTemplate) { 4995 FunctionTemplate->setObjectOfFriendDecl(false); 4996 FunctionTemplate->setAccess(AS_public); 4997 } 4998 NewFD->setObjectOfFriendDecl(false); 4999 NewFD->setAccess(AS_public); 5000 } 5001 5002 // If a function is defined as defaulted or deleted, mark it as such now. 5003 switch (D.getFunctionDefinitionKind()) { 5004 case FDK_Declaration: 5005 case FDK_Definition: 5006 break; 5007 5008 case FDK_Defaulted: 5009 NewFD->setDefaulted(); 5010 break; 5011 5012 case FDK_Deleted: 5013 NewFD->setDeletedAsWritten(); 5014 break; 5015 } 5016 5017 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5018 D.isFunctionDefinition()) { 5019 // C++ [class.mfct]p2: 5020 // A member function may be defined (8.4) in its class definition, in 5021 // which case it is an inline member function (7.1.2) 5022 NewFD->setImplicitlyInline(); 5023 } 5024 5025 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5026 !CurContext->isRecord()) { 5027 // C++ [class.static]p1: 5028 // A data or function member of a class may be declared static 5029 // in a class definition, in which case it is a static member of 5030 // the class. 5031 5032 // Complain about the 'static' specifier if it's on an out-of-line 5033 // member function definition. 5034 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5035 diag::err_static_out_of_line) 5036 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5037 } 5038 } 5039 5040 // Filter out previous declarations that don't match the scope. 5041 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5042 isExplicitSpecialization || 5043 isFunctionTemplateSpecialization); 5044 5045 // Handle GNU asm-label extension (encoded as an attribute). 5046 if (Expr *E = (Expr*) D.getAsmLabel()) { 5047 // The parser guarantees this is a string. 5048 StringLiteral *SE = cast<StringLiteral>(E); 5049 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5050 SE->getString())); 5051 } 5052 5053 // Copy the parameter declarations from the declarator D to the function 5054 // declaration NewFD, if they are available. First scavenge them into Params. 5055 SmallVector<ParmVarDecl*, 16> Params; 5056 if (D.isFunctionDeclarator()) { 5057 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5058 5059 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5060 // function that takes no arguments, not a function that takes a 5061 // single void argument. 5062 // We let through "const void" here because Sema::GetTypeForDeclarator 5063 // already checks for that case. 5064 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5065 FTI.ArgInfo[0].Param && 5066 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5067 // Empty arg list, don't push any params. 5068 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5069 5070 // In C++, the empty parameter-type-list must be spelled "void"; a 5071 // typedef of void is not permitted. 5072 if (getLangOptions().CPlusPlus && 5073 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5074 bool IsTypeAlias = false; 5075 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5076 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5077 else if (const TemplateSpecializationType *TST = 5078 Param->getType()->getAs<TemplateSpecializationType>()) 5079 IsTypeAlias = TST->isTypeAlias(); 5080 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5081 << IsTypeAlias; 5082 } 5083 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5084 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5085 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5086 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5087 Param->setDeclContext(NewFD); 5088 Params.push_back(Param); 5089 5090 if (Param->isInvalidDecl()) 5091 NewFD->setInvalidDecl(); 5092 } 5093 } 5094 5095 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5096 // When we're declaring a function with a typedef, typeof, etc as in the 5097 // following example, we'll need to synthesize (unnamed) 5098 // parameters for use in the declaration. 5099 // 5100 // @code 5101 // typedef void fn(int); 5102 // fn f; 5103 // @endcode 5104 5105 // Synthesize a parameter for each argument type. 5106 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5107 AE = FT->arg_type_end(); AI != AE; ++AI) { 5108 ParmVarDecl *Param = 5109 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5110 Param->setScopeInfo(0, Params.size()); 5111 Params.push_back(Param); 5112 } 5113 } else { 5114 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5115 "Should not need args for typedef of non-prototype fn"); 5116 } 5117 5118 // Finally, we know we have the right number of parameters, install them. 5119 NewFD->setParams(Params); 5120 5121 // Process the non-inheritable attributes on this declaration. 5122 ProcessDeclAttributes(S, NewFD, D, 5123 /*NonInheritable=*/true, /*Inheritable=*/false); 5124 5125 if (!getLangOptions().CPlusPlus) { 5126 // Perform semantic checking on the function declaration. 5127 bool isExplicitSpecialization=false; 5128 if (!NewFD->isInvalidDecl()) { 5129 if (NewFD->getResultType()->isVariablyModifiedType()) { 5130 // Functions returning a variably modified type violate C99 6.7.5.2p2 5131 // because all functions have linkage. 5132 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5133 NewFD->setInvalidDecl(); 5134 } else { 5135 if (NewFD->isMain()) 5136 CheckMain(NewFD, D.getDeclSpec()); 5137 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5138 isExplicitSpecialization)); 5139 } 5140 } 5141 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5142 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5143 "previous declaration set still overloaded"); 5144 } else { 5145 // If the declarator is a template-id, translate the parser's template 5146 // argument list into our AST format. 5147 bool HasExplicitTemplateArgs = false; 5148 TemplateArgumentListInfo TemplateArgs; 5149 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5150 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5151 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5152 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5153 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5154 TemplateId->getTemplateArgs(), 5155 TemplateId->NumArgs); 5156 translateTemplateArguments(TemplateArgsPtr, 5157 TemplateArgs); 5158 TemplateArgsPtr.release(); 5159 5160 HasExplicitTemplateArgs = true; 5161 5162 if (NewFD->isInvalidDecl()) { 5163 HasExplicitTemplateArgs = false; 5164 } else if (FunctionTemplate) { 5165 // Function template with explicit template arguments. 5166 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5167 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5168 5169 HasExplicitTemplateArgs = false; 5170 } else if (!isFunctionTemplateSpecialization && 5171 !D.getDeclSpec().isFriendSpecified()) { 5172 // We have encountered something that the user meant to be a 5173 // specialization (because it has explicitly-specified template 5174 // arguments) but that was not introduced with a "template<>" (or had 5175 // too few of them). 5176 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5177 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5178 << FixItHint::CreateInsertion( 5179 D.getDeclSpec().getSourceRange().getBegin(), 5180 "template<> "); 5181 isFunctionTemplateSpecialization = true; 5182 } else { 5183 // "friend void foo<>(int);" is an implicit specialization decl. 5184 isFunctionTemplateSpecialization = true; 5185 } 5186 } else if (isFriend && isFunctionTemplateSpecialization) { 5187 // This combination is only possible in a recovery case; the user 5188 // wrote something like: 5189 // template <> friend void foo(int); 5190 // which we're recovering from as if the user had written: 5191 // friend void foo<>(int); 5192 // Go ahead and fake up a template id. 5193 HasExplicitTemplateArgs = true; 5194 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5195 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5196 } 5197 5198 // If it's a friend (and only if it's a friend), it's possible 5199 // that either the specialized function type or the specialized 5200 // template is dependent, and therefore matching will fail. In 5201 // this case, don't check the specialization yet. 5202 bool InstantiationDependent = false; 5203 if (isFunctionTemplateSpecialization && isFriend && 5204 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5205 TemplateSpecializationType::anyDependentTemplateArguments( 5206 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5207 InstantiationDependent))) { 5208 assert(HasExplicitTemplateArgs && 5209 "friend function specialization without template args"); 5210 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5211 Previous)) 5212 NewFD->setInvalidDecl(); 5213 } else if (isFunctionTemplateSpecialization) { 5214 if (CurContext->isDependentContext() && CurContext->isRecord() 5215 && !isFriend) { 5216 isDependentClassScopeExplicitSpecialization = true; 5217 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5218 diag::ext_function_specialization_in_class : 5219 diag::err_function_specialization_in_class) 5220 << NewFD->getDeclName(); 5221 } else if (CheckFunctionTemplateSpecialization(NewFD, 5222 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5223 Previous)) 5224 NewFD->setInvalidDecl(); 5225 5226 // C++ [dcl.stc]p1: 5227 // A storage-class-specifier shall not be specified in an explicit 5228 // specialization (14.7.3) 5229 if (SC != SC_None) { 5230 if (SC != NewFD->getStorageClass()) 5231 Diag(NewFD->getLocation(), 5232 diag::err_explicit_specialization_inconsistent_storage_class) 5233 << SC 5234 << FixItHint::CreateRemoval( 5235 D.getDeclSpec().getStorageClassSpecLoc()); 5236 5237 else 5238 Diag(NewFD->getLocation(), 5239 diag::ext_explicit_specialization_storage_class) 5240 << FixItHint::CreateRemoval( 5241 D.getDeclSpec().getStorageClassSpecLoc()); 5242 } 5243 5244 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5245 if (CheckMemberSpecialization(NewFD, Previous)) 5246 NewFD->setInvalidDecl(); 5247 } 5248 5249 // Perform semantic checking on the function declaration. 5250 if (!isDependentClassScopeExplicitSpecialization) { 5251 if (NewFD->isInvalidDecl()) { 5252 // If this is a class member, mark the class invalid immediately. 5253 // This avoids some consistency errors later. 5254 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5255 methodDecl->getParent()->setInvalidDecl(); 5256 } else { 5257 if (NewFD->isMain()) 5258 CheckMain(NewFD, D.getDeclSpec()); 5259 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5260 isExplicitSpecialization)); 5261 } 5262 } 5263 5264 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5265 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5266 "previous declaration set still overloaded"); 5267 5268 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5269 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5270 NewFD->setInvalidDecl(); 5271 5272 NamedDecl *PrincipalDecl = (FunctionTemplate 5273 ? cast<NamedDecl>(FunctionTemplate) 5274 : NewFD); 5275 5276 if (isFriend && D.isRedeclaration()) { 5277 AccessSpecifier Access = AS_public; 5278 if (!NewFD->isInvalidDecl()) 5279 Access = NewFD->getPreviousDeclaration()->getAccess(); 5280 5281 NewFD->setAccess(Access); 5282 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5283 5284 PrincipalDecl->setObjectOfFriendDecl(true); 5285 } 5286 5287 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5288 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5289 PrincipalDecl->setNonMemberOperator(); 5290 5291 // If we have a function template, check the template parameter 5292 // list. This will check and merge default template arguments. 5293 if (FunctionTemplate) { 5294 FunctionTemplateDecl *PrevTemplate = 5295 FunctionTemplate->getPreviousDeclaration(); 5296 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5297 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5298 D.getDeclSpec().isFriendSpecified() 5299 ? (D.isFunctionDefinition() 5300 ? TPC_FriendFunctionTemplateDefinition 5301 : TPC_FriendFunctionTemplate) 5302 : (D.getCXXScopeSpec().isSet() && 5303 DC && DC->isRecord() && 5304 DC->isDependentContext()) 5305 ? TPC_ClassTemplateMember 5306 : TPC_FunctionTemplate); 5307 } 5308 5309 if (NewFD->isInvalidDecl()) { 5310 // Ignore all the rest of this. 5311 } else if (!D.isRedeclaration()) { 5312 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5313 AddToScope }; 5314 // Fake up an access specifier if it's supposed to be a class member. 5315 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5316 NewFD->setAccess(AS_public); 5317 5318 // Qualified decls generally require a previous declaration. 5319 if (D.getCXXScopeSpec().isSet()) { 5320 // ...with the major exception of templated-scope or 5321 // dependent-scope friend declarations. 5322 5323 // TODO: we currently also suppress this check in dependent 5324 // contexts because (1) the parameter depth will be off when 5325 // matching friend templates and (2) we might actually be 5326 // selecting a friend based on a dependent factor. But there 5327 // are situations where these conditions don't apply and we 5328 // can actually do this check immediately. 5329 if (isFriend && 5330 (TemplateParamLists.size() || 5331 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5332 CurContext->isDependentContext())) { 5333 // ignore these 5334 } else { 5335 // The user tried to provide an out-of-line definition for a 5336 // function that is a member of a class or namespace, but there 5337 // was no such member function declared (C++ [class.mfct]p2, 5338 // C++ [namespace.memdef]p2). For example: 5339 // 5340 // class X { 5341 // void f() const; 5342 // }; 5343 // 5344 // void X::f() { } // ill-formed 5345 // 5346 // Complain about this problem, and attempt to suggest close 5347 // matches (e.g., those that differ only in cv-qualifiers and 5348 // whether the parameter types are references). 5349 5350 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5351 NewFD, 5352 ExtraArgs)) { 5353 AddToScope = ExtraArgs.AddToScope; 5354 return Result; 5355 } 5356 } 5357 5358 // Unqualified local friend declarations are required to resolve 5359 // to something. 5360 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5361 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5362 NewFD, 5363 ExtraArgs)) { 5364 AddToScope = ExtraArgs.AddToScope; 5365 return Result; 5366 } 5367 } 5368 5369 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5370 !isFriend && !isFunctionTemplateSpecialization && 5371 !isExplicitSpecialization) { 5372 // An out-of-line member function declaration must also be a 5373 // definition (C++ [dcl.meaning]p1). 5374 // Note that this is not the case for explicit specializations of 5375 // function templates or member functions of class templates, per 5376 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5377 // extension for compatibility with old SWIG code which likes to 5378 // generate them. 5379 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5380 << D.getCXXScopeSpec().getRange(); 5381 } 5382 } 5383 5384 5385 // Handle attributes. We need to have merged decls when handling attributes 5386 // (for example to check for conflicts, etc). 5387 // FIXME: This needs to happen before we merge declarations. Then, 5388 // let attribute merging cope with attribute conflicts. 5389 ProcessDeclAttributes(S, NewFD, D, 5390 /*NonInheritable=*/false, /*Inheritable=*/true); 5391 5392 // attributes declared post-definition are currently ignored 5393 // FIXME: This should happen during attribute merging 5394 if (D.isRedeclaration() && Previous.isSingleResult()) { 5395 const FunctionDecl *Def; 5396 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5397 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5398 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5399 Diag(Def->getLocation(), diag::note_previous_definition); 5400 } 5401 } 5402 5403 AddKnownFunctionAttributes(NewFD); 5404 5405 if (NewFD->hasAttr<OverloadableAttr>() && 5406 !NewFD->getType()->getAs<FunctionProtoType>()) { 5407 Diag(NewFD->getLocation(), 5408 diag::err_attribute_overloadable_no_prototype) 5409 << NewFD; 5410 5411 // Turn this into a variadic function with no parameters. 5412 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5413 FunctionProtoType::ExtProtoInfo EPI; 5414 EPI.Variadic = true; 5415 EPI.ExtInfo = FT->getExtInfo(); 5416 5417 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5418 NewFD->setType(R); 5419 } 5420 5421 // If there's a #pragma GCC visibility in scope, and this isn't a class 5422 // member, set the visibility of this function. 5423 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5424 AddPushedVisibilityAttribute(NewFD); 5425 5426 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5427 // marking the function. 5428 AddCFAuditedAttribute(NewFD); 5429 5430 // If this is a locally-scoped extern C function, update the 5431 // map of such names. 5432 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5433 && !NewFD->isInvalidDecl()) 5434 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5435 5436 // Set this FunctionDecl's range up to the right paren. 5437 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5438 5439 if (getLangOptions().CPlusPlus) { 5440 if (FunctionTemplate) { 5441 if (NewFD->isInvalidDecl()) 5442 FunctionTemplate->setInvalidDecl(); 5443 return FunctionTemplate; 5444 } 5445 } 5446 5447 MarkUnusedFileScopedDecl(NewFD); 5448 5449 if (getLangOptions().CUDA) 5450 if (IdentifierInfo *II = NewFD->getIdentifier()) 5451 if (!NewFD->isInvalidDecl() && 5452 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5453 if (II->isStr("cudaConfigureCall")) { 5454 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5455 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5456 5457 Context.setcudaConfigureCallDecl(NewFD); 5458 } 5459 } 5460 5461 // Here we have an function template explicit specialization at class scope. 5462 // The actually specialization will be postponed to template instatiation 5463 // time via the ClassScopeFunctionSpecializationDecl node. 5464 if (isDependentClassScopeExplicitSpecialization) { 5465 ClassScopeFunctionSpecializationDecl *NewSpec = 5466 ClassScopeFunctionSpecializationDecl::Create( 5467 Context, CurContext, SourceLocation(), 5468 cast<CXXMethodDecl>(NewFD)); 5469 CurContext->addDecl(NewSpec); 5470 AddToScope = false; 5471 } 5472 5473 return NewFD; 5474} 5475 5476/// \brief Perform semantic checking of a new function declaration. 5477/// 5478/// Performs semantic analysis of the new function declaration 5479/// NewFD. This routine performs all semantic checking that does not 5480/// require the actual declarator involved in the declaration, and is 5481/// used both for the declaration of functions as they are parsed 5482/// (called via ActOnDeclarator) and for the declaration of functions 5483/// that have been instantiated via C++ template instantiation (called 5484/// via InstantiateDecl). 5485/// 5486/// \param IsExplicitSpecialiation whether this new function declaration is 5487/// an explicit specialization of the previous declaration. 5488/// 5489/// This sets NewFD->isInvalidDecl() to true if there was an error. 5490/// 5491/// Returns true if the function declaration is a redeclaration. 5492bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5493 LookupResult &Previous, 5494 bool IsExplicitSpecialization) { 5495 assert(!NewFD->getResultType()->isVariablyModifiedType() 5496 && "Variably modified return types are not handled here"); 5497 5498 // Check for a previous declaration of this name. 5499 if (Previous.empty() && NewFD->isExternC()) { 5500 // Since we did not find anything by this name and we're declaring 5501 // an extern "C" function, look for a non-visible extern "C" 5502 // declaration with the same name. 5503 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5504 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5505 if (Pos != LocallyScopedExternalDecls.end()) 5506 Previous.addDecl(Pos->second); 5507 } 5508 5509 bool Redeclaration = false; 5510 5511 // Merge or overload the declaration with an existing declaration of 5512 // the same name, if appropriate. 5513 if (!Previous.empty()) { 5514 // Determine whether NewFD is an overload of PrevDecl or 5515 // a declaration that requires merging. If it's an overload, 5516 // there's no more work to do here; we'll just add the new 5517 // function to the scope. 5518 5519 NamedDecl *OldDecl = 0; 5520 if (!AllowOverloadingOfFunction(Previous, Context)) { 5521 Redeclaration = true; 5522 OldDecl = Previous.getFoundDecl(); 5523 } else { 5524 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5525 /*NewIsUsingDecl*/ false)) { 5526 case Ovl_Match: 5527 Redeclaration = true; 5528 break; 5529 5530 case Ovl_NonFunction: 5531 Redeclaration = true; 5532 break; 5533 5534 case Ovl_Overload: 5535 Redeclaration = false; 5536 break; 5537 } 5538 5539 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5540 // If a function name is overloadable in C, then every function 5541 // with that name must be marked "overloadable". 5542 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5543 << Redeclaration << NewFD; 5544 NamedDecl *OverloadedDecl = 0; 5545 if (Redeclaration) 5546 OverloadedDecl = OldDecl; 5547 else if (!Previous.empty()) 5548 OverloadedDecl = Previous.getRepresentativeDecl(); 5549 if (OverloadedDecl) 5550 Diag(OverloadedDecl->getLocation(), 5551 diag::note_attribute_overloadable_prev_overload); 5552 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5553 Context)); 5554 } 5555 } 5556 5557 if (Redeclaration) { 5558 // NewFD and OldDecl represent declarations that need to be 5559 // merged. 5560 if (MergeFunctionDecl(NewFD, OldDecl)) { 5561 NewFD->setInvalidDecl(); 5562 return Redeclaration; 5563 } 5564 5565 Previous.clear(); 5566 Previous.addDecl(OldDecl); 5567 5568 if (FunctionTemplateDecl *OldTemplateDecl 5569 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5570 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5571 FunctionTemplateDecl *NewTemplateDecl 5572 = NewFD->getDescribedFunctionTemplate(); 5573 assert(NewTemplateDecl && "Template/non-template mismatch"); 5574 if (CXXMethodDecl *Method 5575 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5576 Method->setAccess(OldTemplateDecl->getAccess()); 5577 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5578 } 5579 5580 // If this is an explicit specialization of a member that is a function 5581 // template, mark it as a member specialization. 5582 if (IsExplicitSpecialization && 5583 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5584 NewTemplateDecl->setMemberSpecialization(); 5585 assert(OldTemplateDecl->isMemberSpecialization()); 5586 } 5587 5588 } else { 5589 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5590 NewFD->setAccess(OldDecl->getAccess()); 5591 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5592 } 5593 } 5594 } 5595 5596 // Semantic checking for this function declaration (in isolation). 5597 if (getLangOptions().CPlusPlus) { 5598 // C++-specific checks. 5599 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5600 CheckConstructor(Constructor); 5601 } else if (CXXDestructorDecl *Destructor = 5602 dyn_cast<CXXDestructorDecl>(NewFD)) { 5603 CXXRecordDecl *Record = Destructor->getParent(); 5604 QualType ClassType = Context.getTypeDeclType(Record); 5605 5606 // FIXME: Shouldn't we be able to perform this check even when the class 5607 // type is dependent? Both gcc and edg can handle that. 5608 if (!ClassType->isDependentType()) { 5609 DeclarationName Name 5610 = Context.DeclarationNames.getCXXDestructorName( 5611 Context.getCanonicalType(ClassType)); 5612 if (NewFD->getDeclName() != Name) { 5613 Diag(NewFD->getLocation(), diag::err_destructor_name); 5614 NewFD->setInvalidDecl(); 5615 return Redeclaration; 5616 } 5617 } 5618 } else if (CXXConversionDecl *Conversion 5619 = dyn_cast<CXXConversionDecl>(NewFD)) { 5620 ActOnConversionDeclarator(Conversion); 5621 } 5622 5623 // Find any virtual functions that this function overrides. 5624 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5625 if (!Method->isFunctionTemplateSpecialization() && 5626 !Method->getDescribedFunctionTemplate()) { 5627 if (AddOverriddenMethods(Method->getParent(), Method)) { 5628 // If the function was marked as "static", we have a problem. 5629 if (NewFD->getStorageClass() == SC_Static) { 5630 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5631 << NewFD->getDeclName(); 5632 for (CXXMethodDecl::method_iterator 5633 Overridden = Method->begin_overridden_methods(), 5634 OverriddenEnd = Method->end_overridden_methods(); 5635 Overridden != OverriddenEnd; 5636 ++Overridden) { 5637 Diag((*Overridden)->getLocation(), 5638 diag::note_overridden_virtual_function); 5639 } 5640 } 5641 } 5642 } 5643 } 5644 5645 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5646 if (NewFD->isOverloadedOperator() && 5647 CheckOverloadedOperatorDeclaration(NewFD)) { 5648 NewFD->setInvalidDecl(); 5649 return Redeclaration; 5650 } 5651 5652 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5653 if (NewFD->getLiteralIdentifier() && 5654 CheckLiteralOperatorDeclaration(NewFD)) { 5655 NewFD->setInvalidDecl(); 5656 return Redeclaration; 5657 } 5658 5659 // In C++, check default arguments now that we have merged decls. Unless 5660 // the lexical context is the class, because in this case this is done 5661 // during delayed parsing anyway. 5662 if (!CurContext->isRecord()) 5663 CheckCXXDefaultArguments(NewFD); 5664 5665 // If this function declares a builtin function, check the type of this 5666 // declaration against the expected type for the builtin. 5667 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5668 ASTContext::GetBuiltinTypeError Error; 5669 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5670 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5671 // The type of this function differs from the type of the builtin, 5672 // so forget about the builtin entirely. 5673 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5674 } 5675 } 5676 } 5677 return Redeclaration; 5678} 5679 5680void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5681 // C++ [basic.start.main]p3: A program that declares main to be inline 5682 // or static is ill-formed. 5683 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5684 // shall not appear in a declaration of main. 5685 // static main is not an error under C99, but we should warn about it. 5686 if (FD->getStorageClass() == SC_Static) 5687 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5688 ? diag::err_static_main : diag::warn_static_main) 5689 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5690 if (FD->isInlineSpecified()) 5691 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5692 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5693 5694 QualType T = FD->getType(); 5695 assert(T->isFunctionType() && "function decl is not of function type"); 5696 const FunctionType* FT = T->getAs<FunctionType>(); 5697 5698 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5699 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5700 FD->setInvalidDecl(true); 5701 } 5702 5703 // Treat protoless main() as nullary. 5704 if (isa<FunctionNoProtoType>(FT)) return; 5705 5706 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5707 unsigned nparams = FTP->getNumArgs(); 5708 assert(FD->getNumParams() == nparams); 5709 5710 bool HasExtraParameters = (nparams > 3); 5711 5712 // Darwin passes an undocumented fourth argument of type char**. If 5713 // other platforms start sprouting these, the logic below will start 5714 // getting shifty. 5715 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5716 HasExtraParameters = false; 5717 5718 if (HasExtraParameters) { 5719 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5720 FD->setInvalidDecl(true); 5721 nparams = 3; 5722 } 5723 5724 // FIXME: a lot of the following diagnostics would be improved 5725 // if we had some location information about types. 5726 5727 QualType CharPP = 5728 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5729 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5730 5731 for (unsigned i = 0; i < nparams; ++i) { 5732 QualType AT = FTP->getArgType(i); 5733 5734 bool mismatch = true; 5735 5736 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5737 mismatch = false; 5738 else if (Expected[i] == CharPP) { 5739 // As an extension, the following forms are okay: 5740 // char const ** 5741 // char const * const * 5742 // char * const * 5743 5744 QualifierCollector qs; 5745 const PointerType* PT; 5746 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5747 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5748 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5749 qs.removeConst(); 5750 mismatch = !qs.empty(); 5751 } 5752 } 5753 5754 if (mismatch) { 5755 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5756 // TODO: suggest replacing given type with expected type 5757 FD->setInvalidDecl(true); 5758 } 5759 } 5760 5761 if (nparams == 1 && !FD->isInvalidDecl()) { 5762 Diag(FD->getLocation(), diag::warn_main_one_arg); 5763 } 5764 5765 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5766 Diag(FD->getLocation(), diag::err_main_template_decl); 5767 FD->setInvalidDecl(); 5768 } 5769} 5770 5771bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5772 // FIXME: Need strict checking. In C89, we need to check for 5773 // any assignment, increment, decrement, function-calls, or 5774 // commas outside of a sizeof. In C99, it's the same list, 5775 // except that the aforementioned are allowed in unevaluated 5776 // expressions. Everything else falls under the 5777 // "may accept other forms of constant expressions" exception. 5778 // (We never end up here for C++, so the constant expression 5779 // rules there don't matter.) 5780 if (Init->isConstantInitializer(Context, false)) 5781 return false; 5782 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5783 << Init->getSourceRange(); 5784 return true; 5785} 5786 5787namespace { 5788 // Visits an initialization expression to see if OrigDecl is evaluated in 5789 // its own initialization and throws a warning if it does. 5790 class SelfReferenceChecker 5791 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5792 Sema &S; 5793 Decl *OrigDecl; 5794 bool isRecordType; 5795 bool isPODType; 5796 5797 public: 5798 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5799 5800 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5801 S(S), OrigDecl(OrigDecl) { 5802 isPODType = false; 5803 isRecordType = false; 5804 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5805 isPODType = VD->getType().isPODType(S.Context); 5806 isRecordType = VD->getType()->isRecordType(); 5807 } 5808 } 5809 5810 void VisitExpr(Expr *E) { 5811 if (isa<ObjCMessageExpr>(*E)) return; 5812 if (isRecordType) { 5813 Expr *expr = E; 5814 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5815 ValueDecl *VD = ME->getMemberDecl(); 5816 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5817 expr = ME->getBase(); 5818 } 5819 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5820 HandleDeclRefExpr(DRE); 5821 return; 5822 } 5823 } 5824 Inherited::VisitExpr(E); 5825 } 5826 5827 void VisitMemberExpr(MemberExpr *E) { 5828 if (E->getType()->canDecayToPointerType()) return; 5829 if (isa<FieldDecl>(E->getMemberDecl())) 5830 if (DeclRefExpr *DRE 5831 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5832 HandleDeclRefExpr(DRE); 5833 return; 5834 } 5835 Inherited::VisitMemberExpr(E); 5836 } 5837 5838 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5839 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5840 (isRecordType && E->getCastKind() == CK_NoOp)) { 5841 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5842 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5843 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5844 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5845 HandleDeclRefExpr(DRE); 5846 return; 5847 } 5848 } 5849 Inherited::VisitImplicitCastExpr(E); 5850 } 5851 5852 void VisitUnaryOperator(UnaryOperator *E) { 5853 // For POD record types, addresses of its own members are well-defined. 5854 if (isRecordType && isPODType) return; 5855 Inherited::VisitUnaryOperator(E); 5856 } 5857 5858 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5859 Decl* ReferenceDecl = DRE->getDecl(); 5860 if (OrigDecl != ReferenceDecl) return; 5861 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5862 Sema::NotForRedeclaration); 5863 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5864 S.PDiag(diag::warn_uninit_self_reference_in_init) 5865 << Result.getLookupName() 5866 << OrigDecl->getLocation() 5867 << DRE->getSourceRange()); 5868 } 5869 }; 5870} 5871 5872/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5873void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5874 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5875} 5876 5877/// AddInitializerToDecl - Adds the initializer Init to the 5878/// declaration dcl. If DirectInit is true, this is C++ direct 5879/// initialization rather than copy initialization. 5880void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5881 bool DirectInit, bool TypeMayContainAuto) { 5882 // If there is no declaration, there was an error parsing it. Just ignore 5883 // the initializer. 5884 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5885 return; 5886 5887 // Check for self-references within variable initializers. 5888 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5889 // Variables declared within a function/method body are handled 5890 // by a dataflow analysis. 5891 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5892 CheckSelfReference(RealDecl, Init); 5893 } 5894 else { 5895 CheckSelfReference(RealDecl, Init); 5896 } 5897 5898 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5899 // With declarators parsed the way they are, the parser cannot 5900 // distinguish between a normal initializer and a pure-specifier. 5901 // Thus this grotesque test. 5902 IntegerLiteral *IL; 5903 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5904 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5905 CheckPureMethod(Method, Init->getSourceRange()); 5906 else { 5907 Diag(Method->getLocation(), diag::err_member_function_initialization) 5908 << Method->getDeclName() << Init->getSourceRange(); 5909 Method->setInvalidDecl(); 5910 } 5911 return; 5912 } 5913 5914 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5915 if (!VDecl) { 5916 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5917 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5918 RealDecl->setInvalidDecl(); 5919 return; 5920 } 5921 5922 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5923 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5924 TypeSourceInfo *DeducedType = 0; 5925 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5926 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5927 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5928 << Init->getSourceRange(); 5929 if (!DeducedType) { 5930 RealDecl->setInvalidDecl(); 5931 return; 5932 } 5933 VDecl->setTypeSourceInfo(DeducedType); 5934 VDecl->setType(DeducedType->getType()); 5935 5936 // In ARC, infer lifetime. 5937 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5938 VDecl->setInvalidDecl(); 5939 5940 // If this is a redeclaration, check that the type we just deduced matches 5941 // the previously declared type. 5942 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5943 MergeVarDeclTypes(VDecl, Old); 5944 } 5945 5946 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 5947 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 5948 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5949 VDecl->setInvalidDecl(); 5950 return; 5951 } 5952 5953 5954 // A definition must end up with a complete type, which means it must be 5955 // complete with the restriction that an array type might be completed by the 5956 // initializer; note that later code assumes this restriction. 5957 QualType BaseDeclType = VDecl->getType(); 5958 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5959 BaseDeclType = Array->getElementType(); 5960 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5961 diag::err_typecheck_decl_incomplete_type)) { 5962 RealDecl->setInvalidDecl(); 5963 return; 5964 } 5965 5966 // The variable can not have an abstract class type. 5967 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5968 diag::err_abstract_type_in_decl, 5969 AbstractVariableType)) 5970 VDecl->setInvalidDecl(); 5971 5972 const VarDecl *Def; 5973 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5974 Diag(VDecl->getLocation(), diag::err_redefinition) 5975 << VDecl->getDeclName(); 5976 Diag(Def->getLocation(), diag::note_previous_definition); 5977 VDecl->setInvalidDecl(); 5978 return; 5979 } 5980 5981 const VarDecl* PrevInit = 0; 5982 if (getLangOptions().CPlusPlus) { 5983 // C++ [class.static.data]p4 5984 // If a static data member is of const integral or const 5985 // enumeration type, its declaration in the class definition can 5986 // specify a constant-initializer which shall be an integral 5987 // constant expression (5.19). In that case, the member can appear 5988 // in integral constant expressions. The member shall still be 5989 // defined in a namespace scope if it is used in the program and the 5990 // namespace scope definition shall not contain an initializer. 5991 // 5992 // We already performed a redefinition check above, but for static 5993 // data members we also need to check whether there was an in-class 5994 // declaration with an initializer. 5995 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5996 Diag(VDecl->getLocation(), diag::err_redefinition) 5997 << VDecl->getDeclName(); 5998 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5999 return; 6000 } 6001 6002 if (VDecl->hasLocalStorage()) 6003 getCurFunction()->setHasBranchProtectedScope(); 6004 6005 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6006 VDecl->setInvalidDecl(); 6007 return; 6008 } 6009 } 6010 6011 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6012 // a kernel function cannot be initialized." 6013 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6014 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6015 VDecl->setInvalidDecl(); 6016 return; 6017 } 6018 6019 // Get the decls type and save a reference for later, since 6020 // CheckInitializerTypes may change it. 6021 QualType DclT = VDecl->getType(), SavT = DclT; 6022 6023 // Perform the initialization. 6024 if (!VDecl->isInvalidDecl()) { 6025 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6026 InitializationKind Kind 6027 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6028 Init->getLocStart(), 6029 Init->getLocEnd()) 6030 : InitializationKind::CreateCopy(VDecl->getLocation(), 6031 Init->getLocStart()); 6032 6033 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6034 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6035 MultiExprArg(*this, &Init, 1), 6036 &DclT); 6037 if (Result.isInvalid()) { 6038 VDecl->setInvalidDecl(); 6039 return; 6040 } 6041 6042 Init = Result.takeAs<Expr>(); 6043 } 6044 6045 // If the type changed, it means we had an incomplete type that was 6046 // completed by the initializer. For example: 6047 // int ary[] = { 1, 3, 5 }; 6048 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6049 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6050 VDecl->setType(DclT); 6051 Init->setType(DclT.getNonReferenceType()); 6052 } 6053 6054 // Check any implicit conversions within the expression. 6055 CheckImplicitConversions(Init, VDecl->getLocation()); 6056 6057 if (!VDecl->isInvalidDecl()) 6058 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6059 6060 Init = MaybeCreateExprWithCleanups(Init); 6061 // Attach the initializer to the decl. 6062 VDecl->setInit(Init); 6063 6064 if (VDecl->isLocalVarDecl()) { 6065 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6066 // static storage duration shall be constant expressions or string literals. 6067 // C++ does not have this restriction. 6068 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6069 VDecl->getStorageClass() == SC_Static) 6070 CheckForConstantInitializer(Init, DclT); 6071 } else if (VDecl->isStaticDataMember() && 6072 VDecl->getLexicalDeclContext()->isRecord()) { 6073 // This is an in-class initialization for a static data member, e.g., 6074 // 6075 // struct S { 6076 // static const int value = 17; 6077 // }; 6078 6079 // C++ [class.mem]p4: 6080 // A member-declarator can contain a constant-initializer only 6081 // if it declares a static member (9.4) of const integral or 6082 // const enumeration type, see 9.4.2. 6083 // 6084 // C++11 [class.static.data]p3: 6085 // If a non-volatile const static data member is of integral or 6086 // enumeration type, its declaration in the class definition can 6087 // specify a brace-or-equal-initializer in which every initalizer-clause 6088 // that is an assignment-expression is a constant expression. A static 6089 // data member of literal type can be declared in the class definition 6090 // with the constexpr specifier; if so, its declaration shall specify a 6091 // brace-or-equal-initializer in which every initializer-clause that is 6092 // an assignment-expression is a constant expression. 6093 6094 // Do nothing on dependent types. 6095 if (DclT->isDependentType()) { 6096 6097 // Allow any 'static constexpr' members, whether or not they are of literal 6098 // type. We separately check that the initializer is a constant expression, 6099 // which implicitly requires the member to be of literal type. 6100 } else if (VDecl->isConstexpr()) { 6101 6102 // Require constness. 6103 } else if (!DclT.isConstQualified()) { 6104 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6105 << Init->getSourceRange(); 6106 VDecl->setInvalidDecl(); 6107 6108 // We allow integer constant expressions in all cases. 6109 } else if (DclT->isIntegralOrEnumerationType()) { 6110 // Check whether the expression is a constant expression. 6111 SourceLocation Loc; 6112 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6113 // In C++11, a non-constexpr const static data member with an 6114 // in-class initializer cannot be volatile. 6115 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6116 else if (Init->isValueDependent()) 6117 ; // Nothing to check. 6118 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6119 ; // Ok, it's an ICE! 6120 else if (Init->isEvaluatable(Context)) { 6121 // If we can constant fold the initializer through heroics, accept it, 6122 // but report this as a use of an extension for -pedantic. 6123 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6124 << Init->getSourceRange(); 6125 } else { 6126 // Otherwise, this is some crazy unknown case. Report the issue at the 6127 // location provided by the isIntegerConstantExpr failed check. 6128 Diag(Loc, diag::err_in_class_initializer_non_constant) 6129 << Init->getSourceRange(); 6130 VDecl->setInvalidDecl(); 6131 } 6132 6133 // We allow foldable floating-point constants as an extension. 6134 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6135 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6136 << DclT << Init->getSourceRange(); 6137 if (getLangOptions().CPlusPlus0x) 6138 Diag(VDecl->getLocation(), 6139 diag::note_in_class_initializer_float_type_constexpr) 6140 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6141 6142 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6143 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6144 << Init->getSourceRange(); 6145 VDecl->setInvalidDecl(); 6146 } 6147 6148 // Suggest adding 'constexpr' in C++11 for literal types. 6149 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6150 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6151 << DclT << Init->getSourceRange() 6152 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6153 VDecl->setConstexpr(true); 6154 6155 } else { 6156 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6157 << DclT << Init->getSourceRange(); 6158 VDecl->setInvalidDecl(); 6159 } 6160 } else if (VDecl->isFileVarDecl()) { 6161 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6162 (!getLangOptions().CPlusPlus || 6163 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6164 Diag(VDecl->getLocation(), diag::warn_extern_init); 6165 6166 // C99 6.7.8p4. All file scoped initializers need to be constant. 6167 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6168 CheckForConstantInitializer(Init, DclT); 6169 } 6170 6171 CheckCompleteVariableDeclaration(VDecl); 6172} 6173 6174/// ActOnInitializerError - Given that there was an error parsing an 6175/// initializer for the given declaration, try to return to some form 6176/// of sanity. 6177void Sema::ActOnInitializerError(Decl *D) { 6178 // Our main concern here is re-establishing invariants like "a 6179 // variable's type is either dependent or complete". 6180 if (!D || D->isInvalidDecl()) return; 6181 6182 VarDecl *VD = dyn_cast<VarDecl>(D); 6183 if (!VD) return; 6184 6185 // Auto types are meaningless if we can't make sense of the initializer. 6186 if (ParsingInitForAutoVars.count(D)) { 6187 D->setInvalidDecl(); 6188 return; 6189 } 6190 6191 QualType Ty = VD->getType(); 6192 if (Ty->isDependentType()) return; 6193 6194 // Require a complete type. 6195 if (RequireCompleteType(VD->getLocation(), 6196 Context.getBaseElementType(Ty), 6197 diag::err_typecheck_decl_incomplete_type)) { 6198 VD->setInvalidDecl(); 6199 return; 6200 } 6201 6202 // Require an abstract type. 6203 if (RequireNonAbstractType(VD->getLocation(), Ty, 6204 diag::err_abstract_type_in_decl, 6205 AbstractVariableType)) { 6206 VD->setInvalidDecl(); 6207 return; 6208 } 6209 6210 // Don't bother complaining about constructors or destructors, 6211 // though. 6212} 6213 6214void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6215 bool TypeMayContainAuto) { 6216 // If there is no declaration, there was an error parsing it. Just ignore it. 6217 if (RealDecl == 0) 6218 return; 6219 6220 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6221 QualType Type = Var->getType(); 6222 6223 // C++11 [dcl.spec.auto]p3 6224 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6225 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6226 << Var->getDeclName() << Type; 6227 Var->setInvalidDecl(); 6228 return; 6229 } 6230 6231 // C++11 [class.static.data]p3: A static data member can be declared with 6232 // the constexpr specifier; if so, its declaration shall specify 6233 // a brace-or-equal-initializer. 6234 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6235 // the definition of a variable [...] or the declaration of a static data 6236 // member. 6237 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6238 if (Var->isStaticDataMember()) 6239 Diag(Var->getLocation(), 6240 diag::err_constexpr_static_mem_var_requires_init) 6241 << Var->getDeclName(); 6242 else 6243 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6244 Var->setInvalidDecl(); 6245 return; 6246 } 6247 6248 switch (Var->isThisDeclarationADefinition()) { 6249 case VarDecl::Definition: 6250 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6251 break; 6252 6253 // We have an out-of-line definition of a static data member 6254 // that has an in-class initializer, so we type-check this like 6255 // a declaration. 6256 // 6257 // Fall through 6258 6259 case VarDecl::DeclarationOnly: 6260 // It's only a declaration. 6261 6262 // Block scope. C99 6.7p7: If an identifier for an object is 6263 // declared with no linkage (C99 6.2.2p6), the type for the 6264 // object shall be complete. 6265 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6266 !Var->getLinkage() && !Var->isInvalidDecl() && 6267 RequireCompleteType(Var->getLocation(), Type, 6268 diag::err_typecheck_decl_incomplete_type)) 6269 Var->setInvalidDecl(); 6270 6271 // Make sure that the type is not abstract. 6272 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6273 RequireNonAbstractType(Var->getLocation(), Type, 6274 diag::err_abstract_type_in_decl, 6275 AbstractVariableType)) 6276 Var->setInvalidDecl(); 6277 return; 6278 6279 case VarDecl::TentativeDefinition: 6280 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6281 // object that has file scope without an initializer, and without a 6282 // storage-class specifier or with the storage-class specifier "static", 6283 // constitutes a tentative definition. Note: A tentative definition with 6284 // external linkage is valid (C99 6.2.2p5). 6285 if (!Var->isInvalidDecl()) { 6286 if (const IncompleteArrayType *ArrayT 6287 = Context.getAsIncompleteArrayType(Type)) { 6288 if (RequireCompleteType(Var->getLocation(), 6289 ArrayT->getElementType(), 6290 diag::err_illegal_decl_array_incomplete_type)) 6291 Var->setInvalidDecl(); 6292 } else if (Var->getStorageClass() == SC_Static) { 6293 // C99 6.9.2p3: If the declaration of an identifier for an object is 6294 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6295 // declared type shall not be an incomplete type. 6296 // NOTE: code such as the following 6297 // static struct s; 6298 // struct s { int a; }; 6299 // is accepted by gcc. Hence here we issue a warning instead of 6300 // an error and we do not invalidate the static declaration. 6301 // NOTE: to avoid multiple warnings, only check the first declaration. 6302 if (Var->getPreviousDeclaration() == 0) 6303 RequireCompleteType(Var->getLocation(), Type, 6304 diag::ext_typecheck_decl_incomplete_type); 6305 } 6306 } 6307 6308 // Record the tentative definition; we're done. 6309 if (!Var->isInvalidDecl()) 6310 TentativeDefinitions.push_back(Var); 6311 return; 6312 } 6313 6314 // Provide a specific diagnostic for uninitialized variable 6315 // definitions with incomplete array type. 6316 if (Type->isIncompleteArrayType()) { 6317 Diag(Var->getLocation(), 6318 diag::err_typecheck_incomplete_array_needs_initializer); 6319 Var->setInvalidDecl(); 6320 return; 6321 } 6322 6323 // Provide a specific diagnostic for uninitialized variable 6324 // definitions with reference type. 6325 if (Type->isReferenceType()) { 6326 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6327 << Var->getDeclName() 6328 << SourceRange(Var->getLocation(), Var->getLocation()); 6329 Var->setInvalidDecl(); 6330 return; 6331 } 6332 6333 // Do not attempt to type-check the default initializer for a 6334 // variable with dependent type. 6335 if (Type->isDependentType()) 6336 return; 6337 6338 if (Var->isInvalidDecl()) 6339 return; 6340 6341 if (RequireCompleteType(Var->getLocation(), 6342 Context.getBaseElementType(Type), 6343 diag::err_typecheck_decl_incomplete_type)) { 6344 Var->setInvalidDecl(); 6345 return; 6346 } 6347 6348 // The variable can not have an abstract class type. 6349 if (RequireNonAbstractType(Var->getLocation(), Type, 6350 diag::err_abstract_type_in_decl, 6351 AbstractVariableType)) { 6352 Var->setInvalidDecl(); 6353 return; 6354 } 6355 6356 // Check for jumps past the implicit initializer. C++0x 6357 // clarifies that this applies to a "variable with automatic 6358 // storage duration", not a "local variable". 6359 // C++11 [stmt.dcl]p3 6360 // A program that jumps from a point where a variable with automatic 6361 // storage duration is not in scope to a point where it is in scope is 6362 // ill-formed unless the variable has scalar type, class type with a 6363 // trivial default constructor and a trivial destructor, a cv-qualified 6364 // version of one of these types, or an array of one of the preceding 6365 // types and is declared without an initializer. 6366 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6367 if (const RecordType *Record 6368 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6369 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6370 // Mark the function for further checking even if the looser rules of 6371 // C++11 do not require such checks, so that we can diagnose 6372 // incompatibilities with C++98. 6373 if (!CXXRecord->isPOD()) 6374 getCurFunction()->setHasBranchProtectedScope(); 6375 } 6376 } 6377 6378 // C++03 [dcl.init]p9: 6379 // If no initializer is specified for an object, and the 6380 // object is of (possibly cv-qualified) non-POD class type (or 6381 // array thereof), the object shall be default-initialized; if 6382 // the object is of const-qualified type, the underlying class 6383 // type shall have a user-declared default 6384 // constructor. Otherwise, if no initializer is specified for 6385 // a non- static object, the object and its subobjects, if 6386 // any, have an indeterminate initial value); if the object 6387 // or any of its subobjects are of const-qualified type, the 6388 // program is ill-formed. 6389 // C++0x [dcl.init]p11: 6390 // If no initializer is specified for an object, the object is 6391 // default-initialized; [...]. 6392 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6393 InitializationKind Kind 6394 = InitializationKind::CreateDefault(Var->getLocation()); 6395 6396 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6397 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6398 MultiExprArg(*this, 0, 0)); 6399 if (Init.isInvalid()) 6400 Var->setInvalidDecl(); 6401 else if (Init.get()) 6402 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6403 6404 CheckCompleteVariableDeclaration(Var); 6405 } 6406} 6407 6408void Sema::ActOnCXXForRangeDecl(Decl *D) { 6409 VarDecl *VD = dyn_cast<VarDecl>(D); 6410 if (!VD) { 6411 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6412 D->setInvalidDecl(); 6413 return; 6414 } 6415 6416 VD->setCXXForRangeDecl(true); 6417 6418 // for-range-declaration cannot be given a storage class specifier. 6419 int Error = -1; 6420 switch (VD->getStorageClassAsWritten()) { 6421 case SC_None: 6422 break; 6423 case SC_Extern: 6424 Error = 0; 6425 break; 6426 case SC_Static: 6427 Error = 1; 6428 break; 6429 case SC_PrivateExtern: 6430 Error = 2; 6431 break; 6432 case SC_Auto: 6433 Error = 3; 6434 break; 6435 case SC_Register: 6436 Error = 4; 6437 break; 6438 case SC_OpenCLWorkGroupLocal: 6439 llvm_unreachable("Unexpected storage class"); 6440 } 6441 if (VD->isConstexpr()) 6442 Error = 5; 6443 if (Error != -1) { 6444 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6445 << VD->getDeclName() << Error; 6446 D->setInvalidDecl(); 6447 } 6448} 6449 6450void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6451 if (var->isInvalidDecl()) return; 6452 6453 // In ARC, don't allow jumps past the implicit initialization of a 6454 // local retaining variable. 6455 if (getLangOptions().ObjCAutoRefCount && 6456 var->hasLocalStorage()) { 6457 switch (var->getType().getObjCLifetime()) { 6458 case Qualifiers::OCL_None: 6459 case Qualifiers::OCL_ExplicitNone: 6460 case Qualifiers::OCL_Autoreleasing: 6461 break; 6462 6463 case Qualifiers::OCL_Weak: 6464 case Qualifiers::OCL_Strong: 6465 getCurFunction()->setHasBranchProtectedScope(); 6466 break; 6467 } 6468 } 6469 6470 // All the following checks are C++ only. 6471 if (!getLangOptions().CPlusPlus) return; 6472 6473 QualType baseType = Context.getBaseElementType(var->getType()); 6474 if (baseType->isDependentType()) return; 6475 6476 // __block variables might require us to capture a copy-initializer. 6477 if (var->hasAttr<BlocksAttr>()) { 6478 // It's currently invalid to ever have a __block variable with an 6479 // array type; should we diagnose that here? 6480 6481 // Regardless, we don't want to ignore array nesting when 6482 // constructing this copy. 6483 QualType type = var->getType(); 6484 6485 if (type->isStructureOrClassType()) { 6486 SourceLocation poi = var->getLocation(); 6487 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6488 ExprResult result = 6489 PerformCopyInitialization( 6490 InitializedEntity::InitializeBlock(poi, type, false), 6491 poi, Owned(varRef)); 6492 if (!result.isInvalid()) { 6493 result = MaybeCreateExprWithCleanups(result); 6494 Expr *init = result.takeAs<Expr>(); 6495 Context.setBlockVarCopyInits(var, init); 6496 } 6497 } 6498 } 6499 6500 Expr *Init = var->getInit(); 6501 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6502 6503 if (!var->getDeclContext()->isDependentContext() && Init) { 6504 if (IsGlobal && !var->isConstexpr() && 6505 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6506 var->getLocation()) 6507 != DiagnosticsEngine::Ignored && 6508 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6509 Diag(var->getLocation(), diag::warn_global_constructor) 6510 << Init->getSourceRange(); 6511 6512 if (var->isConstexpr()) { 6513 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6514 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6515 SourceLocation DiagLoc = var->getLocation(); 6516 // If the note doesn't add any useful information other than a source 6517 // location, fold it into the primary diagnostic. 6518 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6519 diag::note_invalid_subexpr_in_const_expr) { 6520 DiagLoc = Notes[0].first; 6521 Notes.clear(); 6522 } 6523 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6524 << var << Init->getSourceRange(); 6525 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6526 Diag(Notes[I].first, Notes[I].second); 6527 } 6528 } else if (var->isUsableInConstantExpressions()) { 6529 // Check whether the initializer of a const variable of integral or 6530 // enumeration type is an ICE now, since we can't tell whether it was 6531 // initialized by a constant expression if we check later. 6532 var->checkInitIsICE(); 6533 } 6534 } 6535 6536 // Require the destructor. 6537 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6538 FinalizeVarWithDestructor(var, recordType); 6539} 6540 6541/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6542/// any semantic actions necessary after any initializer has been attached. 6543void 6544Sema::FinalizeDeclaration(Decl *ThisDecl) { 6545 // Note that we are no longer parsing the initializer for this declaration. 6546 ParsingInitForAutoVars.erase(ThisDecl); 6547} 6548 6549Sema::DeclGroupPtrTy 6550Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6551 Decl **Group, unsigned NumDecls) { 6552 SmallVector<Decl*, 8> Decls; 6553 6554 if (DS.isTypeSpecOwned()) 6555 Decls.push_back(DS.getRepAsDecl()); 6556 6557 for (unsigned i = 0; i != NumDecls; ++i) 6558 if (Decl *D = Group[i]) 6559 Decls.push_back(D); 6560 6561 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6562 DS.getTypeSpecType() == DeclSpec::TST_auto); 6563} 6564 6565/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6566/// group, performing any necessary semantic checking. 6567Sema::DeclGroupPtrTy 6568Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6569 bool TypeMayContainAuto) { 6570 // C++0x [dcl.spec.auto]p7: 6571 // If the type deduced for the template parameter U is not the same in each 6572 // deduction, the program is ill-formed. 6573 // FIXME: When initializer-list support is added, a distinction is needed 6574 // between the deduced type U and the deduced type which 'auto' stands for. 6575 // auto a = 0, b = { 1, 2, 3 }; 6576 // is legal because the deduced type U is 'int' in both cases. 6577 if (TypeMayContainAuto && NumDecls > 1) { 6578 QualType Deduced; 6579 CanQualType DeducedCanon; 6580 VarDecl *DeducedDecl = 0; 6581 for (unsigned i = 0; i != NumDecls; ++i) { 6582 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6583 AutoType *AT = D->getType()->getContainedAutoType(); 6584 // Don't reissue diagnostics when instantiating a template. 6585 if (AT && D->isInvalidDecl()) 6586 break; 6587 if (AT && AT->isDeduced()) { 6588 QualType U = AT->getDeducedType(); 6589 CanQualType UCanon = Context.getCanonicalType(U); 6590 if (Deduced.isNull()) { 6591 Deduced = U; 6592 DeducedCanon = UCanon; 6593 DeducedDecl = D; 6594 } else if (DeducedCanon != UCanon) { 6595 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6596 diag::err_auto_different_deductions) 6597 << Deduced << DeducedDecl->getDeclName() 6598 << U << D->getDeclName() 6599 << DeducedDecl->getInit()->getSourceRange() 6600 << D->getInit()->getSourceRange(); 6601 D->setInvalidDecl(); 6602 break; 6603 } 6604 } 6605 } 6606 } 6607 } 6608 6609 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6610} 6611 6612 6613/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6614/// to introduce parameters into function prototype scope. 6615Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6616 const DeclSpec &DS = D.getDeclSpec(); 6617 6618 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6619 // C++03 [dcl.stc]p2 also permits 'auto'. 6620 VarDecl::StorageClass StorageClass = SC_None; 6621 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6622 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6623 StorageClass = SC_Register; 6624 StorageClassAsWritten = SC_Register; 6625 } else if (getLangOptions().CPlusPlus && 6626 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6627 StorageClass = SC_Auto; 6628 StorageClassAsWritten = SC_Auto; 6629 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6630 Diag(DS.getStorageClassSpecLoc(), 6631 diag::err_invalid_storage_class_in_func_decl); 6632 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6633 } 6634 6635 if (D.getDeclSpec().isThreadSpecified()) 6636 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6637 if (D.getDeclSpec().isConstexprSpecified()) 6638 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6639 << 0; 6640 6641 DiagnoseFunctionSpecifiers(D); 6642 6643 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6644 QualType parmDeclType = TInfo->getType(); 6645 6646 if (getLangOptions().CPlusPlus) { 6647 // Check that there are no default arguments inside the type of this 6648 // parameter. 6649 CheckExtraCXXDefaultArguments(D); 6650 6651 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6652 if (D.getCXXScopeSpec().isSet()) { 6653 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6654 << D.getCXXScopeSpec().getRange(); 6655 D.getCXXScopeSpec().clear(); 6656 } 6657 } 6658 6659 // Ensure we have a valid name 6660 IdentifierInfo *II = 0; 6661 if (D.hasName()) { 6662 II = D.getIdentifier(); 6663 if (!II) { 6664 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6665 << GetNameForDeclarator(D).getName().getAsString(); 6666 D.setInvalidType(true); 6667 } 6668 } 6669 6670 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6671 if (II) { 6672 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6673 ForRedeclaration); 6674 LookupName(R, S); 6675 if (R.isSingleResult()) { 6676 NamedDecl *PrevDecl = R.getFoundDecl(); 6677 if (PrevDecl->isTemplateParameter()) { 6678 // Maybe we will complain about the shadowed template parameter. 6679 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6680 // Just pretend that we didn't see the previous declaration. 6681 PrevDecl = 0; 6682 } else if (S->isDeclScope(PrevDecl)) { 6683 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6684 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6685 6686 // Recover by removing the name 6687 II = 0; 6688 D.SetIdentifier(0, D.getIdentifierLoc()); 6689 D.setInvalidType(true); 6690 } 6691 } 6692 } 6693 6694 // Temporarily put parameter variables in the translation unit, not 6695 // the enclosing context. This prevents them from accidentally 6696 // looking like class members in C++. 6697 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6698 D.getSourceRange().getBegin(), 6699 D.getIdentifierLoc(), II, 6700 parmDeclType, TInfo, 6701 StorageClass, StorageClassAsWritten); 6702 6703 if (D.isInvalidType()) 6704 New->setInvalidDecl(); 6705 6706 assert(S->isFunctionPrototypeScope()); 6707 assert(S->getFunctionPrototypeDepth() >= 1); 6708 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6709 S->getNextFunctionPrototypeIndex()); 6710 6711 // Add the parameter declaration into this scope. 6712 S->AddDecl(New); 6713 if (II) 6714 IdResolver.AddDecl(New); 6715 6716 ProcessDeclAttributes(S, New, D); 6717 6718 if (D.getDeclSpec().isModulePrivateSpecified()) 6719 Diag(New->getLocation(), diag::err_module_private_local) 6720 << 1 << New->getDeclName() 6721 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6722 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6723 6724 if (New->hasAttr<BlocksAttr>()) { 6725 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6726 } 6727 return New; 6728} 6729 6730/// \brief Synthesizes a variable for a parameter arising from a 6731/// typedef. 6732ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6733 SourceLocation Loc, 6734 QualType T) { 6735 /* FIXME: setting StartLoc == Loc. 6736 Would it be worth to modify callers so as to provide proper source 6737 location for the unnamed parameters, embedding the parameter's type? */ 6738 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6739 T, Context.getTrivialTypeSourceInfo(T, Loc), 6740 SC_None, SC_None, 0); 6741 Param->setImplicit(); 6742 return Param; 6743} 6744 6745void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6746 ParmVarDecl * const *ParamEnd) { 6747 // Don't diagnose unused-parameter errors in template instantiations; we 6748 // will already have done so in the template itself. 6749 if (!ActiveTemplateInstantiations.empty()) 6750 return; 6751 6752 for (; Param != ParamEnd; ++Param) { 6753 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6754 !(*Param)->hasAttr<UnusedAttr>()) { 6755 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6756 << (*Param)->getDeclName(); 6757 } 6758 } 6759} 6760 6761void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6762 ParmVarDecl * const *ParamEnd, 6763 QualType ReturnTy, 6764 NamedDecl *D) { 6765 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6766 return; 6767 6768 // Warn if the return value is pass-by-value and larger than the specified 6769 // threshold. 6770 if (ReturnTy.isPODType(Context)) { 6771 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6772 if (Size > LangOpts.NumLargeByValueCopy) 6773 Diag(D->getLocation(), diag::warn_return_value_size) 6774 << D->getDeclName() << Size; 6775 } 6776 6777 // Warn if any parameter is pass-by-value and larger than the specified 6778 // threshold. 6779 for (; Param != ParamEnd; ++Param) { 6780 QualType T = (*Param)->getType(); 6781 if (!T.isPODType(Context)) 6782 continue; 6783 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6784 if (Size > LangOpts.NumLargeByValueCopy) 6785 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6786 << (*Param)->getDeclName() << Size; 6787 } 6788} 6789 6790ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6791 SourceLocation NameLoc, IdentifierInfo *Name, 6792 QualType T, TypeSourceInfo *TSInfo, 6793 VarDecl::StorageClass StorageClass, 6794 VarDecl::StorageClass StorageClassAsWritten) { 6795 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6796 if (getLangOptions().ObjCAutoRefCount && 6797 T.getObjCLifetime() == Qualifiers::OCL_None && 6798 T->isObjCLifetimeType()) { 6799 6800 Qualifiers::ObjCLifetime lifetime; 6801 6802 // Special cases for arrays: 6803 // - if it's const, use __unsafe_unretained 6804 // - otherwise, it's an error 6805 if (T->isArrayType()) { 6806 if (!T.isConstQualified()) { 6807 DelayedDiagnostics.add( 6808 sema::DelayedDiagnostic::makeForbiddenType( 6809 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6810 } 6811 lifetime = Qualifiers::OCL_ExplicitNone; 6812 } else { 6813 lifetime = T->getObjCARCImplicitLifetime(); 6814 } 6815 T = Context.getLifetimeQualifiedType(T, lifetime); 6816 } 6817 6818 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6819 Context.getAdjustedParameterType(T), 6820 TSInfo, 6821 StorageClass, StorageClassAsWritten, 6822 0); 6823 6824 // Parameters can not be abstract class types. 6825 // For record types, this is done by the AbstractClassUsageDiagnoser once 6826 // the class has been completely parsed. 6827 if (!CurContext->isRecord() && 6828 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6829 AbstractParamType)) 6830 New->setInvalidDecl(); 6831 6832 // Parameter declarators cannot be interface types. All ObjC objects are 6833 // passed by reference. 6834 if (T->isObjCObjectType()) { 6835 Diag(NameLoc, 6836 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6837 << FixItHint::CreateInsertion(NameLoc, "*"); 6838 T = Context.getObjCObjectPointerType(T); 6839 New->setType(T); 6840 } 6841 6842 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6843 // duration shall not be qualified by an address-space qualifier." 6844 // Since all parameters have automatic store duration, they can not have 6845 // an address space. 6846 if (T.getAddressSpace() != 0) { 6847 Diag(NameLoc, diag::err_arg_with_address_space); 6848 New->setInvalidDecl(); 6849 } 6850 6851 return New; 6852} 6853 6854void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6855 SourceLocation LocAfterDecls) { 6856 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6857 6858 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6859 // for a K&R function. 6860 if (!FTI.hasPrototype) { 6861 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6862 --i; 6863 if (FTI.ArgInfo[i].Param == 0) { 6864 llvm::SmallString<256> Code; 6865 llvm::raw_svector_ostream(Code) << " int " 6866 << FTI.ArgInfo[i].Ident->getName() 6867 << ";\n"; 6868 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6869 << FTI.ArgInfo[i].Ident 6870 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6871 6872 // Implicitly declare the argument as type 'int' for lack of a better 6873 // type. 6874 AttributeFactory attrs; 6875 DeclSpec DS(attrs); 6876 const char* PrevSpec; // unused 6877 unsigned DiagID; // unused 6878 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6879 PrevSpec, DiagID); 6880 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6881 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6882 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6883 } 6884 } 6885 } 6886} 6887 6888Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6889 Declarator &D) { 6890 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6891 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6892 Scope *ParentScope = FnBodyScope->getParent(); 6893 6894 D.setFunctionDefinitionKind(FDK_Definition); 6895 Decl *DP = HandleDeclarator(ParentScope, D, 6896 MultiTemplateParamsArg(*this)); 6897 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6898} 6899 6900static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6901 // Don't warn about invalid declarations. 6902 if (FD->isInvalidDecl()) 6903 return false; 6904 6905 // Or declarations that aren't global. 6906 if (!FD->isGlobal()) 6907 return false; 6908 6909 // Don't warn about C++ member functions. 6910 if (isa<CXXMethodDecl>(FD)) 6911 return false; 6912 6913 // Don't warn about 'main'. 6914 if (FD->isMain()) 6915 return false; 6916 6917 // Don't warn about inline functions. 6918 if (FD->isInlined()) 6919 return false; 6920 6921 // Don't warn about function templates. 6922 if (FD->getDescribedFunctionTemplate()) 6923 return false; 6924 6925 // Don't warn about function template specializations. 6926 if (FD->isFunctionTemplateSpecialization()) 6927 return false; 6928 6929 bool MissingPrototype = true; 6930 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6931 Prev; Prev = Prev->getPreviousDeclaration()) { 6932 // Ignore any declarations that occur in function or method 6933 // scope, because they aren't visible from the header. 6934 if (Prev->getDeclContext()->isFunctionOrMethod()) 6935 continue; 6936 6937 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6938 break; 6939 } 6940 6941 return MissingPrototype; 6942} 6943 6944void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6945 // Don't complain if we're in GNU89 mode and the previous definition 6946 // was an extern inline function. 6947 const FunctionDecl *Definition; 6948 if (FD->isDefined(Definition) && 6949 !canRedefineFunction(Definition, getLangOptions())) { 6950 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6951 Definition->getStorageClass() == SC_Extern) 6952 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6953 << FD->getDeclName() << getLangOptions().CPlusPlus; 6954 else 6955 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6956 Diag(Definition->getLocation(), diag::note_previous_definition); 6957 } 6958} 6959 6960Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6961 // Clear the last template instantiation error context. 6962 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6963 6964 if (!D) 6965 return D; 6966 FunctionDecl *FD = 0; 6967 6968 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6969 FD = FunTmpl->getTemplatedDecl(); 6970 else 6971 FD = cast<FunctionDecl>(D); 6972 6973 // Enter a new function scope 6974 PushFunctionScope(); 6975 6976 // See if this is a redefinition. 6977 if (!FD->isLateTemplateParsed()) 6978 CheckForFunctionRedefinition(FD); 6979 6980 // Builtin functions cannot be defined. 6981 if (unsigned BuiltinID = FD->getBuiltinID()) { 6982 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6983 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6984 FD->setInvalidDecl(); 6985 } 6986 } 6987 6988 // The return type of a function definition must be complete 6989 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6990 QualType ResultType = FD->getResultType(); 6991 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6992 !FD->isInvalidDecl() && 6993 RequireCompleteType(FD->getLocation(), ResultType, 6994 diag::err_func_def_incomplete_result)) 6995 FD->setInvalidDecl(); 6996 6997 // GNU warning -Wmissing-prototypes: 6998 // Warn if a global function is defined without a previous 6999 // prototype declaration. This warning is issued even if the 7000 // definition itself provides a prototype. The aim is to detect 7001 // global functions that fail to be declared in header files. 7002 if (ShouldWarnAboutMissingPrototype(FD)) 7003 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7004 7005 if (FnBodyScope) 7006 PushDeclContext(FnBodyScope, FD); 7007 7008 // Check the validity of our function parameters 7009 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7010 /*CheckParameterNames=*/true); 7011 7012 // Introduce our parameters into the function scope 7013 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7014 ParmVarDecl *Param = FD->getParamDecl(p); 7015 Param->setOwningFunction(FD); 7016 7017 // If this has an identifier, add it to the scope stack. 7018 if (Param->getIdentifier() && FnBodyScope) { 7019 CheckShadow(FnBodyScope, Param); 7020 7021 PushOnScopeChains(Param, FnBodyScope); 7022 } 7023 } 7024 7025 // Checking attributes of current function definition 7026 // dllimport attribute. 7027 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7028 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7029 // dllimport attribute cannot be directly applied to definition. 7030 // Microsoft accepts dllimport for functions defined within class scope. 7031 if (!DA->isInherited() && 7032 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7033 Diag(FD->getLocation(), 7034 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7035 << "dllimport"; 7036 FD->setInvalidDecl(); 7037 return FD; 7038 } 7039 7040 // Visual C++ appears to not think this is an issue, so only issue 7041 // a warning when Microsoft extensions are disabled. 7042 if (!LangOpts.MicrosoftExt) { 7043 // If a symbol previously declared dllimport is later defined, the 7044 // attribute is ignored in subsequent references, and a warning is 7045 // emitted. 7046 Diag(FD->getLocation(), 7047 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7048 << FD->getName() << "dllimport"; 7049 } 7050 } 7051 return FD; 7052} 7053 7054/// \brief Given the set of return statements within a function body, 7055/// compute the variables that are subject to the named return value 7056/// optimization. 7057/// 7058/// Each of the variables that is subject to the named return value 7059/// optimization will be marked as NRVO variables in the AST, and any 7060/// return statement that has a marked NRVO variable as its NRVO candidate can 7061/// use the named return value optimization. 7062/// 7063/// This function applies a very simplistic algorithm for NRVO: if every return 7064/// statement in the function has the same NRVO candidate, that candidate is 7065/// the NRVO variable. 7066/// 7067/// FIXME: Employ a smarter algorithm that accounts for multiple return 7068/// statements and the lifetimes of the NRVO candidates. We should be able to 7069/// find a maximal set of NRVO variables. 7070void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7071 ReturnStmt **Returns = Scope->Returns.data(); 7072 7073 const VarDecl *NRVOCandidate = 0; 7074 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7075 if (!Returns[I]->getNRVOCandidate()) 7076 return; 7077 7078 if (!NRVOCandidate) 7079 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7080 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7081 return; 7082 } 7083 7084 if (NRVOCandidate) 7085 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7086} 7087 7088Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7089 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7090} 7091 7092Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7093 bool IsInstantiation) { 7094 FunctionDecl *FD = 0; 7095 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7096 if (FunTmpl) 7097 FD = FunTmpl->getTemplatedDecl(); 7098 else 7099 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7100 7101 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7102 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7103 7104 if (FD) { 7105 FD->setBody(Body); 7106 if (FD->isMain()) { 7107 // C and C++ allow for main to automagically return 0. 7108 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7109 FD->setHasImplicitReturnZero(true); 7110 WP.disableCheckFallThrough(); 7111 } else if (FD->hasAttr<NakedAttr>()) { 7112 // If the function is marked 'naked', don't complain about missing return 7113 // statements. 7114 WP.disableCheckFallThrough(); 7115 } 7116 7117 // MSVC permits the use of pure specifier (=0) on function definition, 7118 // defined at class scope, warn about this non standard construct. 7119 if (getLangOptions().MicrosoftExt && FD->isPure()) 7120 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7121 7122 if (!FD->isInvalidDecl()) { 7123 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7124 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7125 FD->getResultType(), FD); 7126 7127 // If this is a constructor, we need a vtable. 7128 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7129 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7130 7131 computeNRVO(Body, getCurFunction()); 7132 } 7133 7134 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7135 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7136 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7137 MD->setBody(Body); 7138 if (Body) 7139 MD->setEndLoc(Body->getLocEnd()); 7140 if (!MD->isInvalidDecl()) { 7141 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7142 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7143 MD->getResultType(), MD); 7144 7145 if (Body) 7146 computeNRVO(Body, getCurFunction()); 7147 } 7148 if (ObjCShouldCallSuperDealloc) { 7149 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7150 ObjCShouldCallSuperDealloc = false; 7151 } 7152 if (ObjCShouldCallSuperFinalize) { 7153 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7154 ObjCShouldCallSuperFinalize = false; 7155 } 7156 } else { 7157 return 0; 7158 } 7159 7160 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7161 "ObjC methods, which should have been handled in the block above."); 7162 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7163 "ObjC methods, which should have been handled in the block above."); 7164 7165 // Verify and clean out per-function state. 7166 if (Body) { 7167 // C++ constructors that have function-try-blocks can't have return 7168 // statements in the handlers of that block. (C++ [except.handle]p14) 7169 // Verify this. 7170 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7171 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7172 7173 // Verify that gotos and switch cases don't jump into scopes illegally. 7174 if (getCurFunction()->NeedsScopeChecking() && 7175 !dcl->isInvalidDecl() && 7176 !hasAnyUnrecoverableErrorsInThisFunction()) 7177 DiagnoseInvalidJumps(Body); 7178 7179 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7180 if (!Destructor->getParent()->isDependentType()) 7181 CheckDestructor(Destructor); 7182 7183 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7184 Destructor->getParent()); 7185 } 7186 7187 // If any errors have occurred, clear out any temporaries that may have 7188 // been leftover. This ensures that these temporaries won't be picked up for 7189 // deletion in some later function. 7190 if (PP.getDiagnostics().hasErrorOccurred() || 7191 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7192 DiscardCleanupsInEvaluationContext(); 7193 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7194 // Since the body is valid, issue any analysis-based warnings that are 7195 // enabled. 7196 ActivePolicy = &WP; 7197 } 7198 7199 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7200 !CheckConstexprFunctionBody(FD, Body)) 7201 FD->setInvalidDecl(); 7202 7203 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7204 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7205 } 7206 7207 if (!IsInstantiation) 7208 PopDeclContext(); 7209 7210 PopFunctionOrBlockScope(ActivePolicy, dcl); 7211 7212 // If any errors have occurred, clear out any temporaries that may have 7213 // been leftover. This ensures that these temporaries won't be picked up for 7214 // deletion in some later function. 7215 if (getDiagnostics().hasErrorOccurred()) { 7216 DiscardCleanupsInEvaluationContext(); 7217 } 7218 7219 return dcl; 7220} 7221 7222 7223/// When we finish delayed parsing of an attribute, we must attach it to the 7224/// relevant Decl. 7225void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7226 ParsedAttributes &Attrs) { 7227 ProcessDeclAttributeList(S, D, Attrs.getList()); 7228} 7229 7230 7231/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7232/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7233NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7234 IdentifierInfo &II, Scope *S) { 7235 // Before we produce a declaration for an implicitly defined 7236 // function, see whether there was a locally-scoped declaration of 7237 // this name as a function or variable. If so, use that 7238 // (non-visible) declaration, and complain about it. 7239 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7240 = findLocallyScopedExternalDecl(&II); 7241 if (Pos != LocallyScopedExternalDecls.end()) { 7242 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7243 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7244 return Pos->second; 7245 } 7246 7247 // Extension in C99. Legal in C90, but warn about it. 7248 unsigned diag_id; 7249 if (II.getName().startswith("__builtin_")) 7250 diag_id = diag::err_builtin_unknown; 7251 else if (getLangOptions().C99) 7252 diag_id = diag::ext_implicit_function_decl; 7253 else 7254 diag_id = diag::warn_implicit_function_decl; 7255 Diag(Loc, diag_id) << &II; 7256 7257 // Because typo correction is expensive, only do it if the implicit 7258 // function declaration is going to be treated as an error. 7259 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7260 TypoCorrection Corrected; 7261 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7262 LookupOrdinaryName, S, 0))) { 7263 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7264 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7265 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7266 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7267 7268 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7269 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7270 7271 if (Func->getLocation().isValid() 7272 && !II.getName().startswith("__builtin_")) 7273 Diag(Func->getLocation(), diag::note_previous_decl) 7274 << CorrectedQuotedStr; 7275 } 7276 } 7277 } 7278 7279 // Set a Declarator for the implicit definition: int foo(); 7280 const char *Dummy; 7281 AttributeFactory attrFactory; 7282 DeclSpec DS(attrFactory); 7283 unsigned DiagID; 7284 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7285 (void)Error; // Silence warning. 7286 assert(!Error && "Error setting up implicit decl!"); 7287 Declarator D(DS, Declarator::BlockContext); 7288 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7289 0, 0, true, SourceLocation(), 7290 SourceLocation(), SourceLocation(), 7291 SourceLocation(), 7292 EST_None, SourceLocation(), 7293 0, 0, 0, 0, Loc, Loc, D), 7294 DS.getAttributes(), 7295 SourceLocation()); 7296 D.SetIdentifier(&II, Loc); 7297 7298 // Insert this function into translation-unit scope. 7299 7300 DeclContext *PrevDC = CurContext; 7301 CurContext = Context.getTranslationUnitDecl(); 7302 7303 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7304 FD->setImplicit(); 7305 7306 CurContext = PrevDC; 7307 7308 AddKnownFunctionAttributes(FD); 7309 7310 return FD; 7311} 7312 7313/// \brief Adds any function attributes that we know a priori based on 7314/// the declaration of this function. 7315/// 7316/// These attributes can apply both to implicitly-declared builtins 7317/// (like __builtin___printf_chk) or to library-declared functions 7318/// like NSLog or printf. 7319/// 7320/// We need to check for duplicate attributes both here and where user-written 7321/// attributes are applied to declarations. 7322void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7323 if (FD->isInvalidDecl()) 7324 return; 7325 7326 // If this is a built-in function, map its builtin attributes to 7327 // actual attributes. 7328 if (unsigned BuiltinID = FD->getBuiltinID()) { 7329 // Handle printf-formatting attributes. 7330 unsigned FormatIdx; 7331 bool HasVAListArg; 7332 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7333 if (!FD->getAttr<FormatAttr>()) 7334 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7335 "printf", FormatIdx+1, 7336 HasVAListArg ? 0 : FormatIdx+2)); 7337 } 7338 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7339 HasVAListArg)) { 7340 if (!FD->getAttr<FormatAttr>()) 7341 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7342 "scanf", FormatIdx+1, 7343 HasVAListArg ? 0 : FormatIdx+2)); 7344 } 7345 7346 // Mark const if we don't care about errno and that is the only 7347 // thing preventing the function from being const. This allows 7348 // IRgen to use LLVM intrinsics for such functions. 7349 if (!getLangOptions().MathErrno && 7350 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7351 if (!FD->getAttr<ConstAttr>()) 7352 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7353 } 7354 7355 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7356 !FD->getAttr<ReturnsTwiceAttr>()) 7357 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7358 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7359 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7360 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7361 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7362 } 7363 7364 IdentifierInfo *Name = FD->getIdentifier(); 7365 if (!Name) 7366 return; 7367 if ((!getLangOptions().CPlusPlus && 7368 FD->getDeclContext()->isTranslationUnit()) || 7369 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7370 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7371 LinkageSpecDecl::lang_c)) { 7372 // Okay: this could be a libc/libm/Objective-C function we know 7373 // about. 7374 } else 7375 return; 7376 7377 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7378 // FIXME: NSLog and NSLogv should be target specific 7379 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7380 // FIXME: We known better than our headers. 7381 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7382 } else 7383 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7384 "printf", 1, 7385 Name->isStr("NSLogv") ? 0 : 2)); 7386 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7387 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7388 // target-specific builtins, perhaps? 7389 if (!FD->getAttr<FormatAttr>()) 7390 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7391 "printf", 2, 7392 Name->isStr("vasprintf") ? 0 : 3)); 7393 } 7394} 7395 7396TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7397 TypeSourceInfo *TInfo) { 7398 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7399 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7400 7401 if (!TInfo) { 7402 assert(D.isInvalidType() && "no declarator info for valid type"); 7403 TInfo = Context.getTrivialTypeSourceInfo(T); 7404 } 7405 7406 // Scope manipulation handled by caller. 7407 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7408 D.getSourceRange().getBegin(), 7409 D.getIdentifierLoc(), 7410 D.getIdentifier(), 7411 TInfo); 7412 7413 // Bail out immediately if we have an invalid declaration. 7414 if (D.isInvalidType()) { 7415 NewTD->setInvalidDecl(); 7416 return NewTD; 7417 } 7418 7419 if (D.getDeclSpec().isModulePrivateSpecified()) { 7420 if (CurContext->isFunctionOrMethod()) 7421 Diag(NewTD->getLocation(), diag::err_module_private_local) 7422 << 2 << NewTD->getDeclName() 7423 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7424 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7425 else 7426 NewTD->setModulePrivate(); 7427 } 7428 7429 // C++ [dcl.typedef]p8: 7430 // If the typedef declaration defines an unnamed class (or 7431 // enum), the first typedef-name declared by the declaration 7432 // to be that class type (or enum type) is used to denote the 7433 // class type (or enum type) for linkage purposes only. 7434 // We need to check whether the type was declared in the declaration. 7435 switch (D.getDeclSpec().getTypeSpecType()) { 7436 case TST_enum: 7437 case TST_struct: 7438 case TST_union: 7439 case TST_class: { 7440 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7441 7442 // Do nothing if the tag is not anonymous or already has an 7443 // associated typedef (from an earlier typedef in this decl group). 7444 if (tagFromDeclSpec->getIdentifier()) break; 7445 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7446 7447 // A well-formed anonymous tag must always be a TUK_Definition. 7448 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7449 7450 // The type must match the tag exactly; no qualifiers allowed. 7451 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7452 break; 7453 7454 // Otherwise, set this is the anon-decl typedef for the tag. 7455 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7456 break; 7457 } 7458 7459 default: 7460 break; 7461 } 7462 7463 return NewTD; 7464} 7465 7466 7467/// \brief Determine whether a tag with a given kind is acceptable 7468/// as a redeclaration of the given tag declaration. 7469/// 7470/// \returns true if the new tag kind is acceptable, false otherwise. 7471bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7472 TagTypeKind NewTag, bool isDefinition, 7473 SourceLocation NewTagLoc, 7474 const IdentifierInfo &Name) { 7475 // C++ [dcl.type.elab]p3: 7476 // The class-key or enum keyword present in the 7477 // elaborated-type-specifier shall agree in kind with the 7478 // declaration to which the name in the elaborated-type-specifier 7479 // refers. This rule also applies to the form of 7480 // elaborated-type-specifier that declares a class-name or 7481 // friend class since it can be construed as referring to the 7482 // definition of the class. Thus, in any 7483 // elaborated-type-specifier, the enum keyword shall be used to 7484 // refer to an enumeration (7.2), the union class-key shall be 7485 // used to refer to a union (clause 9), and either the class or 7486 // struct class-key shall be used to refer to a class (clause 9) 7487 // declared using the class or struct class-key. 7488 TagTypeKind OldTag = Previous->getTagKind(); 7489 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7490 if (OldTag == NewTag) 7491 return true; 7492 7493 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7494 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7495 // Warn about the struct/class tag mismatch. 7496 bool isTemplate = false; 7497 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7498 isTemplate = Record->getDescribedClassTemplate(); 7499 7500 if (!ActiveTemplateInstantiations.empty()) { 7501 // In a template instantiation, do not offer fix-its for tag mismatches 7502 // since they usually mess up the template instead of fixing the problem. 7503 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7504 << (NewTag == TTK_Class) << isTemplate << &Name; 7505 return true; 7506 } 7507 7508 if (isDefinition) { 7509 // On definitions, check previous tags and issue a fix-it for each 7510 // one that doesn't match the current tag. 7511 if (Previous->getDefinition()) { 7512 // Don't suggest fix-its for redefinitions. 7513 return true; 7514 } 7515 7516 bool previousMismatch = false; 7517 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7518 E(Previous->redecls_end()); I != E; ++I) { 7519 if (I->getTagKind() != NewTag) { 7520 if (!previousMismatch) { 7521 previousMismatch = true; 7522 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7523 << (NewTag == TTK_Class) << isTemplate << &Name; 7524 } 7525 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7526 << (NewTag == TTK_Class) 7527 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7528 NewTag == TTK_Class? 7529 "class" : "struct"); 7530 } 7531 } 7532 return true; 7533 } 7534 7535 // Check for a previous definition. If current tag and definition 7536 // are same type, do nothing. If no definition, but disagree with 7537 // with previous tag type, give a warning, but no fix-it. 7538 const TagDecl *Redecl = Previous->getDefinition() ? 7539 Previous->getDefinition() : Previous; 7540 if (Redecl->getTagKind() == NewTag) { 7541 return true; 7542 } 7543 7544 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7545 << (NewTag == TTK_Class) 7546 << isTemplate << &Name; 7547 Diag(Redecl->getLocation(), diag::note_previous_use); 7548 7549 // If there is a previous defintion, suggest a fix-it. 7550 if (Previous->getDefinition()) { 7551 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7552 << (Redecl->getTagKind() == TTK_Class) 7553 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7554 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7555 } 7556 7557 return true; 7558 } 7559 return false; 7560} 7561 7562/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7563/// former case, Name will be non-null. In the later case, Name will be null. 7564/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7565/// reference/declaration/definition of a tag. 7566Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7567 SourceLocation KWLoc, CXXScopeSpec &SS, 7568 IdentifierInfo *Name, SourceLocation NameLoc, 7569 AttributeList *Attr, AccessSpecifier AS, 7570 SourceLocation ModulePrivateLoc, 7571 MultiTemplateParamsArg TemplateParameterLists, 7572 bool &OwnedDecl, bool &IsDependent, 7573 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7574 TypeResult UnderlyingType) { 7575 // If this is not a definition, it must have a name. 7576 assert((Name != 0 || TUK == TUK_Definition) && 7577 "Nameless record must be a definition!"); 7578 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7579 7580 OwnedDecl = false; 7581 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7582 7583 // FIXME: Check explicit specializations more carefully. 7584 bool isExplicitSpecialization = false; 7585 bool Invalid = false; 7586 7587 // We only need to do this matching if we have template parameters 7588 // or a scope specifier, which also conveniently avoids this work 7589 // for non-C++ cases. 7590 if (TemplateParameterLists.size() > 0 || 7591 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7592 if (TemplateParameterList *TemplateParams 7593 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7594 TemplateParameterLists.get(), 7595 TemplateParameterLists.size(), 7596 TUK == TUK_Friend, 7597 isExplicitSpecialization, 7598 Invalid)) { 7599 if (TemplateParams->size() > 0) { 7600 // This is a declaration or definition of a class template (which may 7601 // be a member of another template). 7602 7603 if (Invalid) 7604 return 0; 7605 7606 OwnedDecl = false; 7607 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7608 SS, Name, NameLoc, Attr, 7609 TemplateParams, AS, 7610 ModulePrivateLoc, 7611 TemplateParameterLists.size() - 1, 7612 (TemplateParameterList**) TemplateParameterLists.release()); 7613 return Result.get(); 7614 } else { 7615 // The "template<>" header is extraneous. 7616 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7617 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7618 isExplicitSpecialization = true; 7619 } 7620 } 7621 } 7622 7623 // Figure out the underlying type if this a enum declaration. We need to do 7624 // this early, because it's needed to detect if this is an incompatible 7625 // redeclaration. 7626 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7627 7628 if (Kind == TTK_Enum) { 7629 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7630 // No underlying type explicitly specified, or we failed to parse the 7631 // type, default to int. 7632 EnumUnderlying = Context.IntTy.getTypePtr(); 7633 else if (UnderlyingType.get()) { 7634 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7635 // integral type; any cv-qualification is ignored. 7636 TypeSourceInfo *TI = 0; 7637 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7638 EnumUnderlying = TI; 7639 7640 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7641 7642 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7643 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7644 << T; 7645 // Recover by falling back to int. 7646 EnumUnderlying = Context.IntTy.getTypePtr(); 7647 } 7648 7649 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7650 UPPC_FixedUnderlyingType)) 7651 EnumUnderlying = Context.IntTy.getTypePtr(); 7652 7653 } else if (getLangOptions().MicrosoftExt) 7654 // Microsoft enums are always of int type. 7655 EnumUnderlying = Context.IntTy.getTypePtr(); 7656 } 7657 7658 DeclContext *SearchDC = CurContext; 7659 DeclContext *DC = CurContext; 7660 bool isStdBadAlloc = false; 7661 7662 RedeclarationKind Redecl = ForRedeclaration; 7663 if (TUK == TUK_Friend || TUK == TUK_Reference) 7664 Redecl = NotForRedeclaration; 7665 7666 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7667 7668 if (Name && SS.isNotEmpty()) { 7669 // We have a nested-name tag ('struct foo::bar'). 7670 7671 // Check for invalid 'foo::'. 7672 if (SS.isInvalid()) { 7673 Name = 0; 7674 goto CreateNewDecl; 7675 } 7676 7677 // If this is a friend or a reference to a class in a dependent 7678 // context, don't try to make a decl for it. 7679 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7680 DC = computeDeclContext(SS, false); 7681 if (!DC) { 7682 IsDependent = true; 7683 return 0; 7684 } 7685 } else { 7686 DC = computeDeclContext(SS, true); 7687 if (!DC) { 7688 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7689 << SS.getRange(); 7690 return 0; 7691 } 7692 } 7693 7694 if (RequireCompleteDeclContext(SS, DC)) 7695 return 0; 7696 7697 SearchDC = DC; 7698 // Look-up name inside 'foo::'. 7699 LookupQualifiedName(Previous, DC); 7700 7701 if (Previous.isAmbiguous()) 7702 return 0; 7703 7704 if (Previous.empty()) { 7705 // Name lookup did not find anything. However, if the 7706 // nested-name-specifier refers to the current instantiation, 7707 // and that current instantiation has any dependent base 7708 // classes, we might find something at instantiation time: treat 7709 // this as a dependent elaborated-type-specifier. 7710 // But this only makes any sense for reference-like lookups. 7711 if (Previous.wasNotFoundInCurrentInstantiation() && 7712 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7713 IsDependent = true; 7714 return 0; 7715 } 7716 7717 // A tag 'foo::bar' must already exist. 7718 Diag(NameLoc, diag::err_not_tag_in_scope) 7719 << Kind << Name << DC << SS.getRange(); 7720 Name = 0; 7721 Invalid = true; 7722 goto CreateNewDecl; 7723 } 7724 } else if (Name) { 7725 // If this is a named struct, check to see if there was a previous forward 7726 // declaration or definition. 7727 // FIXME: We're looking into outer scopes here, even when we 7728 // shouldn't be. Doing so can result in ambiguities that we 7729 // shouldn't be diagnosing. 7730 LookupName(Previous, S); 7731 7732 if (Previous.isAmbiguous() && 7733 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7734 LookupResult::Filter F = Previous.makeFilter(); 7735 while (F.hasNext()) { 7736 NamedDecl *ND = F.next(); 7737 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7738 F.erase(); 7739 } 7740 F.done(); 7741 } 7742 7743 // Note: there used to be some attempt at recovery here. 7744 if (Previous.isAmbiguous()) 7745 return 0; 7746 7747 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7748 // FIXME: This makes sure that we ignore the contexts associated 7749 // with C structs, unions, and enums when looking for a matching 7750 // tag declaration or definition. See the similar lookup tweak 7751 // in Sema::LookupName; is there a better way to deal with this? 7752 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7753 SearchDC = SearchDC->getParent(); 7754 } 7755 } else if (S->isFunctionPrototypeScope()) { 7756 // If this is an enum declaration in function prototype scope, set its 7757 // initial context to the translation unit. 7758 SearchDC = Context.getTranslationUnitDecl(); 7759 } 7760 7761 if (Previous.isSingleResult() && 7762 Previous.getFoundDecl()->isTemplateParameter()) { 7763 // Maybe we will complain about the shadowed template parameter. 7764 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7765 // Just pretend that we didn't see the previous declaration. 7766 Previous.clear(); 7767 } 7768 7769 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7770 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7771 // This is a declaration of or a reference to "std::bad_alloc". 7772 isStdBadAlloc = true; 7773 7774 if (Previous.empty() && StdBadAlloc) { 7775 // std::bad_alloc has been implicitly declared (but made invisible to 7776 // name lookup). Fill in this implicit declaration as the previous 7777 // declaration, so that the declarations get chained appropriately. 7778 Previous.addDecl(getStdBadAlloc()); 7779 } 7780 } 7781 7782 // If we didn't find a previous declaration, and this is a reference 7783 // (or friend reference), move to the correct scope. In C++, we 7784 // also need to do a redeclaration lookup there, just in case 7785 // there's a shadow friend decl. 7786 if (Name && Previous.empty() && 7787 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7788 if (Invalid) goto CreateNewDecl; 7789 assert(SS.isEmpty()); 7790 7791 if (TUK == TUK_Reference) { 7792 // C++ [basic.scope.pdecl]p5: 7793 // -- for an elaborated-type-specifier of the form 7794 // 7795 // class-key identifier 7796 // 7797 // if the elaborated-type-specifier is used in the 7798 // decl-specifier-seq or parameter-declaration-clause of a 7799 // function defined in namespace scope, the identifier is 7800 // declared as a class-name in the namespace that contains 7801 // the declaration; otherwise, except as a friend 7802 // declaration, the identifier is declared in the smallest 7803 // non-class, non-function-prototype scope that contains the 7804 // declaration. 7805 // 7806 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7807 // C structs and unions. 7808 // 7809 // It is an error in C++ to declare (rather than define) an enum 7810 // type, including via an elaborated type specifier. We'll 7811 // diagnose that later; for now, declare the enum in the same 7812 // scope as we would have picked for any other tag type. 7813 // 7814 // GNU C also supports this behavior as part of its incomplete 7815 // enum types extension, while GNU C++ does not. 7816 // 7817 // Find the context where we'll be declaring the tag. 7818 // FIXME: We would like to maintain the current DeclContext as the 7819 // lexical context, 7820 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7821 SearchDC = SearchDC->getParent(); 7822 7823 // Find the scope where we'll be declaring the tag. 7824 while (S->isClassScope() || 7825 (getLangOptions().CPlusPlus && 7826 S->isFunctionPrototypeScope()) || 7827 ((S->getFlags() & Scope::DeclScope) == 0) || 7828 (S->getEntity() && 7829 ((DeclContext *)S->getEntity())->isTransparentContext())) 7830 S = S->getParent(); 7831 } else { 7832 assert(TUK == TUK_Friend); 7833 // C++ [namespace.memdef]p3: 7834 // If a friend declaration in a non-local class first declares a 7835 // class or function, the friend class or function is a member of 7836 // the innermost enclosing namespace. 7837 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7838 } 7839 7840 // In C++, we need to do a redeclaration lookup to properly 7841 // diagnose some problems. 7842 if (getLangOptions().CPlusPlus) { 7843 Previous.setRedeclarationKind(ForRedeclaration); 7844 LookupQualifiedName(Previous, SearchDC); 7845 } 7846 } 7847 7848 if (!Previous.empty()) { 7849 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7850 7851 // It's okay to have a tag decl in the same scope as a typedef 7852 // which hides a tag decl in the same scope. Finding this 7853 // insanity with a redeclaration lookup can only actually happen 7854 // in C++. 7855 // 7856 // This is also okay for elaborated-type-specifiers, which is 7857 // technically forbidden by the current standard but which is 7858 // okay according to the likely resolution of an open issue; 7859 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7860 if (getLangOptions().CPlusPlus) { 7861 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7862 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7863 TagDecl *Tag = TT->getDecl(); 7864 if (Tag->getDeclName() == Name && 7865 Tag->getDeclContext()->getRedeclContext() 7866 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7867 PrevDecl = Tag; 7868 Previous.clear(); 7869 Previous.addDecl(Tag); 7870 Previous.resolveKind(); 7871 } 7872 } 7873 } 7874 } 7875 7876 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7877 // If this is a use of a previous tag, or if the tag is already declared 7878 // in the same scope (so that the definition/declaration completes or 7879 // rementions the tag), reuse the decl. 7880 if (TUK == TUK_Reference || TUK == TUK_Friend || 7881 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7882 // Make sure that this wasn't declared as an enum and now used as a 7883 // struct or something similar. 7884 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7885 TUK == TUK_Definition, KWLoc, 7886 *Name)) { 7887 bool SafeToContinue 7888 = (PrevTagDecl->getTagKind() != TTK_Enum && 7889 Kind != TTK_Enum); 7890 if (SafeToContinue) 7891 Diag(KWLoc, diag::err_use_with_wrong_tag) 7892 << Name 7893 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7894 PrevTagDecl->getKindName()); 7895 else 7896 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7897 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7898 7899 if (SafeToContinue) 7900 Kind = PrevTagDecl->getTagKind(); 7901 else { 7902 // Recover by making this an anonymous redefinition. 7903 Name = 0; 7904 Previous.clear(); 7905 Invalid = true; 7906 } 7907 } 7908 7909 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7910 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7911 7912 // All conflicts with previous declarations are recovered by 7913 // returning the previous declaration. 7914 if (ScopedEnum != PrevEnum->isScoped()) { 7915 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7916 << PrevEnum->isScoped(); 7917 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7918 return PrevTagDecl; 7919 } 7920 else if (EnumUnderlying && PrevEnum->isFixed()) { 7921 QualType T; 7922 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7923 T = TI->getType(); 7924 else 7925 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7926 7927 if (!Context.hasSameUnqualifiedType(T, 7928 PrevEnum->getIntegerType())) { 7929 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7930 diag::err_enum_redeclare_type_mismatch) 7931 << T 7932 << PrevEnum->getIntegerType(); 7933 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7934 return PrevTagDecl; 7935 } 7936 } 7937 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7938 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7939 << PrevEnum->isFixed(); 7940 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7941 return PrevTagDecl; 7942 } 7943 } 7944 7945 if (!Invalid) { 7946 // If this is a use, just return the declaration we found. 7947 7948 // FIXME: In the future, return a variant or some other clue 7949 // for the consumer of this Decl to know it doesn't own it. 7950 // For our current ASTs this shouldn't be a problem, but will 7951 // need to be changed with DeclGroups. 7952 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7953 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7954 return PrevTagDecl; 7955 7956 // Diagnose attempts to redefine a tag. 7957 if (TUK == TUK_Definition) { 7958 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7959 // If we're defining a specialization and the previous definition 7960 // is from an implicit instantiation, don't emit an error 7961 // here; we'll catch this in the general case below. 7962 if (!isExplicitSpecialization || 7963 !isa<CXXRecordDecl>(Def) || 7964 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7965 == TSK_ExplicitSpecialization) { 7966 Diag(NameLoc, diag::err_redefinition) << Name; 7967 Diag(Def->getLocation(), diag::note_previous_definition); 7968 // If this is a redefinition, recover by making this 7969 // struct be anonymous, which will make any later 7970 // references get the previous definition. 7971 Name = 0; 7972 Previous.clear(); 7973 Invalid = true; 7974 } 7975 } else { 7976 // If the type is currently being defined, complain 7977 // about a nested redefinition. 7978 const TagType *Tag 7979 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7980 if (Tag->isBeingDefined()) { 7981 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7982 Diag(PrevTagDecl->getLocation(), 7983 diag::note_previous_definition); 7984 Name = 0; 7985 Previous.clear(); 7986 Invalid = true; 7987 } 7988 } 7989 7990 // Okay, this is definition of a previously declared or referenced 7991 // tag PrevDecl. We're going to create a new Decl for it. 7992 } 7993 } 7994 // If we get here we have (another) forward declaration or we 7995 // have a definition. Just create a new decl. 7996 7997 } else { 7998 // If we get here, this is a definition of a new tag type in a nested 7999 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8000 // new decl/type. We set PrevDecl to NULL so that the entities 8001 // have distinct types. 8002 Previous.clear(); 8003 } 8004 // If we get here, we're going to create a new Decl. If PrevDecl 8005 // is non-NULL, it's a definition of the tag declared by 8006 // PrevDecl. If it's NULL, we have a new definition. 8007 8008 8009 // Otherwise, PrevDecl is not a tag, but was found with tag 8010 // lookup. This is only actually possible in C++, where a few 8011 // things like templates still live in the tag namespace. 8012 } else { 8013 assert(getLangOptions().CPlusPlus); 8014 8015 // Use a better diagnostic if an elaborated-type-specifier 8016 // found the wrong kind of type on the first 8017 // (non-redeclaration) lookup. 8018 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8019 !Previous.isForRedeclaration()) { 8020 unsigned Kind = 0; 8021 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8022 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8023 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8024 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8025 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8026 Invalid = true; 8027 8028 // Otherwise, only diagnose if the declaration is in scope. 8029 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8030 isExplicitSpecialization)) { 8031 // do nothing 8032 8033 // Diagnose implicit declarations introduced by elaborated types. 8034 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8035 unsigned Kind = 0; 8036 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8037 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8038 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8039 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8040 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8041 Invalid = true; 8042 8043 // Otherwise it's a declaration. Call out a particularly common 8044 // case here. 8045 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8046 unsigned Kind = 0; 8047 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8048 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8049 << Name << Kind << TND->getUnderlyingType(); 8050 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8051 Invalid = true; 8052 8053 // Otherwise, diagnose. 8054 } else { 8055 // The tag name clashes with something else in the target scope, 8056 // issue an error and recover by making this tag be anonymous. 8057 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8058 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8059 Name = 0; 8060 Invalid = true; 8061 } 8062 8063 // The existing declaration isn't relevant to us; we're in a 8064 // new scope, so clear out the previous declaration. 8065 Previous.clear(); 8066 } 8067 } 8068 8069CreateNewDecl: 8070 8071 TagDecl *PrevDecl = 0; 8072 if (Previous.isSingleResult()) 8073 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8074 8075 // If there is an identifier, use the location of the identifier as the 8076 // location of the decl, otherwise use the location of the struct/union 8077 // keyword. 8078 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8079 8080 // Otherwise, create a new declaration. If there is a previous 8081 // declaration of the same entity, the two will be linked via 8082 // PrevDecl. 8083 TagDecl *New; 8084 8085 bool IsForwardReference = false; 8086 if (Kind == TTK_Enum) { 8087 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8088 // enum X { A, B, C } D; D should chain to X. 8089 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8090 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8091 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8092 // If this is an undefined enum, warn. 8093 if (TUK != TUK_Definition && !Invalid) { 8094 TagDecl *Def; 8095 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8096 // C++0x: 7.2p2: opaque-enum-declaration. 8097 // Conflicts are diagnosed above. Do nothing. 8098 } 8099 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8100 Diag(Loc, diag::ext_forward_ref_enum_def) 8101 << New; 8102 Diag(Def->getLocation(), diag::note_previous_definition); 8103 } else { 8104 unsigned DiagID = diag::ext_forward_ref_enum; 8105 if (getLangOptions().MicrosoftExt) 8106 DiagID = diag::ext_ms_forward_ref_enum; 8107 else if (getLangOptions().CPlusPlus) 8108 DiagID = diag::err_forward_ref_enum; 8109 Diag(Loc, DiagID); 8110 8111 // If this is a forward-declared reference to an enumeration, make a 8112 // note of it; we won't actually be introducing the declaration into 8113 // the declaration context. 8114 if (TUK == TUK_Reference) 8115 IsForwardReference = true; 8116 } 8117 } 8118 8119 if (EnumUnderlying) { 8120 EnumDecl *ED = cast<EnumDecl>(New); 8121 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8122 ED->setIntegerTypeSourceInfo(TI); 8123 else 8124 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8125 ED->setPromotionType(ED->getIntegerType()); 8126 } 8127 8128 } else { 8129 // struct/union/class 8130 8131 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8132 // struct X { int A; } D; D should chain to X. 8133 if (getLangOptions().CPlusPlus) { 8134 // FIXME: Look for a way to use RecordDecl for simple structs. 8135 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8136 cast_or_null<CXXRecordDecl>(PrevDecl)); 8137 8138 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8139 StdBadAlloc = cast<CXXRecordDecl>(New); 8140 } else 8141 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8142 cast_or_null<RecordDecl>(PrevDecl)); 8143 } 8144 8145 // Maybe add qualifier info. 8146 if (SS.isNotEmpty()) { 8147 if (SS.isSet()) { 8148 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8149 if (TemplateParameterLists.size() > 0) { 8150 New->setTemplateParameterListsInfo(Context, 8151 TemplateParameterLists.size(), 8152 (TemplateParameterList**) TemplateParameterLists.release()); 8153 } 8154 } 8155 else 8156 Invalid = true; 8157 } 8158 8159 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8160 // Add alignment attributes if necessary; these attributes are checked when 8161 // the ASTContext lays out the structure. 8162 // 8163 // It is important for implementing the correct semantics that this 8164 // happen here (in act on tag decl). The #pragma pack stack is 8165 // maintained as a result of parser callbacks which can occur at 8166 // many points during the parsing of a struct declaration (because 8167 // the #pragma tokens are effectively skipped over during the 8168 // parsing of the struct). 8169 AddAlignmentAttributesForRecord(RD); 8170 8171 AddMsStructLayoutForRecord(RD); 8172 } 8173 8174 if (ModulePrivateLoc.isValid()) { 8175 if (isExplicitSpecialization) 8176 Diag(New->getLocation(), diag::err_module_private_specialization) 8177 << 2 8178 << FixItHint::CreateRemoval(ModulePrivateLoc); 8179 // __module_private__ does not apply to local classes. However, we only 8180 // diagnose this as an error when the declaration specifiers are 8181 // freestanding. Here, we just ignore the __module_private__. 8182 else if (!SearchDC->isFunctionOrMethod()) 8183 New->setModulePrivate(); 8184 } 8185 8186 // If this is a specialization of a member class (of a class template), 8187 // check the specialization. 8188 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8189 Invalid = true; 8190 8191 if (Invalid) 8192 New->setInvalidDecl(); 8193 8194 if (Attr) 8195 ProcessDeclAttributeList(S, New, Attr); 8196 8197 // If we're declaring or defining a tag in function prototype scope 8198 // in C, note that this type can only be used within the function. 8199 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8200 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8201 8202 // Set the lexical context. If the tag has a C++ scope specifier, the 8203 // lexical context will be different from the semantic context. 8204 New->setLexicalDeclContext(CurContext); 8205 8206 // Mark this as a friend decl if applicable. 8207 // In Microsoft mode, a friend declaration also acts as a forward 8208 // declaration so we always pass true to setObjectOfFriendDecl to make 8209 // the tag name visible. 8210 if (TUK == TUK_Friend) 8211 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8212 getLangOptions().MicrosoftExt); 8213 8214 // Set the access specifier. 8215 if (!Invalid && SearchDC->isRecord()) 8216 SetMemberAccessSpecifier(New, PrevDecl, AS); 8217 8218 if (TUK == TUK_Definition) 8219 New->startDefinition(); 8220 8221 // If this has an identifier, add it to the scope stack. 8222 if (TUK == TUK_Friend) { 8223 // We might be replacing an existing declaration in the lookup tables; 8224 // if so, borrow its access specifier. 8225 if (PrevDecl) 8226 New->setAccess(PrevDecl->getAccess()); 8227 8228 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8229 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8230 if (Name) // can be null along some error paths 8231 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8232 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8233 } else if (Name) { 8234 S = getNonFieldDeclScope(S); 8235 PushOnScopeChains(New, S, !IsForwardReference); 8236 if (IsForwardReference) 8237 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8238 8239 } else { 8240 CurContext->addDecl(New); 8241 } 8242 8243 // If this is the C FILE type, notify the AST context. 8244 if (IdentifierInfo *II = New->getIdentifier()) 8245 if (!New->isInvalidDecl() && 8246 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8247 II->isStr("FILE")) 8248 Context.setFILEDecl(New); 8249 8250 OwnedDecl = true; 8251 return New; 8252} 8253 8254void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8255 AdjustDeclIfTemplate(TagD); 8256 TagDecl *Tag = cast<TagDecl>(TagD); 8257 8258 // Enter the tag context. 8259 PushDeclContext(S, Tag); 8260} 8261 8262Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8263 assert(isa<ObjCContainerDecl>(IDecl) && 8264 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8265 DeclContext *OCD = cast<DeclContext>(IDecl); 8266 assert(getContainingDC(OCD) == CurContext && 8267 "The next DeclContext should be lexically contained in the current one."); 8268 CurContext = OCD; 8269 return IDecl; 8270} 8271 8272void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8273 SourceLocation FinalLoc, 8274 SourceLocation LBraceLoc) { 8275 AdjustDeclIfTemplate(TagD); 8276 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8277 8278 FieldCollector->StartClass(); 8279 8280 if (!Record->getIdentifier()) 8281 return; 8282 8283 if (FinalLoc.isValid()) 8284 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8285 8286 // C++ [class]p2: 8287 // [...] The class-name is also inserted into the scope of the 8288 // class itself; this is known as the injected-class-name. For 8289 // purposes of access checking, the injected-class-name is treated 8290 // as if it were a public member name. 8291 CXXRecordDecl *InjectedClassName 8292 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8293 Record->getLocStart(), Record->getLocation(), 8294 Record->getIdentifier(), 8295 /*PrevDecl=*/0, 8296 /*DelayTypeCreation=*/true); 8297 Context.getTypeDeclType(InjectedClassName, Record); 8298 InjectedClassName->setImplicit(); 8299 InjectedClassName->setAccess(AS_public); 8300 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8301 InjectedClassName->setDescribedClassTemplate(Template); 8302 PushOnScopeChains(InjectedClassName, S); 8303 assert(InjectedClassName->isInjectedClassName() && 8304 "Broken injected-class-name"); 8305} 8306 8307void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8308 SourceLocation RBraceLoc) { 8309 AdjustDeclIfTemplate(TagD); 8310 TagDecl *Tag = cast<TagDecl>(TagD); 8311 Tag->setRBraceLoc(RBraceLoc); 8312 8313 if (isa<CXXRecordDecl>(Tag)) 8314 FieldCollector->FinishClass(); 8315 8316 // Exit this scope of this tag's definition. 8317 PopDeclContext(); 8318 8319 // Notify the consumer that we've defined a tag. 8320 Consumer.HandleTagDeclDefinition(Tag); 8321} 8322 8323void Sema::ActOnObjCContainerFinishDefinition() { 8324 // Exit this scope of this interface definition. 8325 PopDeclContext(); 8326} 8327 8328void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8329 assert(DC == CurContext && "Mismatch of container contexts"); 8330 OriginalLexicalContext = DC; 8331 ActOnObjCContainerFinishDefinition(); 8332} 8333 8334void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8335 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8336 OriginalLexicalContext = 0; 8337} 8338 8339void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8340 AdjustDeclIfTemplate(TagD); 8341 TagDecl *Tag = cast<TagDecl>(TagD); 8342 Tag->setInvalidDecl(); 8343 8344 // We're undoing ActOnTagStartDefinition here, not 8345 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8346 // the FieldCollector. 8347 8348 PopDeclContext(); 8349} 8350 8351// Note that FieldName may be null for anonymous bitfields. 8352bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8353 QualType FieldTy, const Expr *BitWidth, 8354 bool *ZeroWidth) { 8355 // Default to true; that shouldn't confuse checks for emptiness 8356 if (ZeroWidth) 8357 *ZeroWidth = true; 8358 8359 // C99 6.7.2.1p4 - verify the field type. 8360 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8361 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8362 // Handle incomplete types with specific error. 8363 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8364 return true; 8365 if (FieldName) 8366 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8367 << FieldName << FieldTy << BitWidth->getSourceRange(); 8368 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8369 << FieldTy << BitWidth->getSourceRange(); 8370 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8371 UPPC_BitFieldWidth)) 8372 return true; 8373 8374 // If the bit-width is type- or value-dependent, don't try to check 8375 // it now. 8376 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8377 return false; 8378 8379 llvm::APSInt Value; 8380 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8381 return true; 8382 8383 if (Value != 0 && ZeroWidth) 8384 *ZeroWidth = false; 8385 8386 // Zero-width bitfield is ok for anonymous field. 8387 if (Value == 0 && FieldName) 8388 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8389 8390 if (Value.isSigned() && Value.isNegative()) { 8391 if (FieldName) 8392 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8393 << FieldName << Value.toString(10); 8394 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8395 << Value.toString(10); 8396 } 8397 8398 if (!FieldTy->isDependentType()) { 8399 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8400 if (Value.getZExtValue() > TypeSize) { 8401 if (!getLangOptions().CPlusPlus) { 8402 if (FieldName) 8403 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8404 << FieldName << (unsigned)Value.getZExtValue() 8405 << (unsigned)TypeSize; 8406 8407 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8408 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8409 } 8410 8411 if (FieldName) 8412 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8413 << FieldName << (unsigned)Value.getZExtValue() 8414 << (unsigned)TypeSize; 8415 else 8416 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8417 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8418 } 8419 } 8420 8421 return false; 8422} 8423 8424/// ActOnField - Each field of a C struct/union is passed into this in order 8425/// to create a FieldDecl object for it. 8426Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8427 Declarator &D, Expr *BitfieldWidth) { 8428 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8429 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8430 /*HasInit=*/false, AS_public); 8431 return Res; 8432} 8433 8434/// HandleField - Analyze a field of a C struct or a C++ data member. 8435/// 8436FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8437 SourceLocation DeclStart, 8438 Declarator &D, Expr *BitWidth, bool HasInit, 8439 AccessSpecifier AS) { 8440 IdentifierInfo *II = D.getIdentifier(); 8441 SourceLocation Loc = DeclStart; 8442 if (II) Loc = D.getIdentifierLoc(); 8443 8444 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8445 QualType T = TInfo->getType(); 8446 if (getLangOptions().CPlusPlus) { 8447 CheckExtraCXXDefaultArguments(D); 8448 8449 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8450 UPPC_DataMemberType)) { 8451 D.setInvalidType(); 8452 T = Context.IntTy; 8453 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8454 } 8455 } 8456 8457 DiagnoseFunctionSpecifiers(D); 8458 8459 if (D.getDeclSpec().isThreadSpecified()) 8460 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8461 if (D.getDeclSpec().isConstexprSpecified()) 8462 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8463 << 2; 8464 8465 // Check to see if this name was declared as a member previously 8466 NamedDecl *PrevDecl = 0; 8467 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8468 LookupName(Previous, S); 8469 switch (Previous.getResultKind()) { 8470 case LookupResult::Found: 8471 case LookupResult::FoundUnresolvedValue: 8472 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8473 break; 8474 8475 case LookupResult::FoundOverloaded: 8476 PrevDecl = Previous.getRepresentativeDecl(); 8477 break; 8478 8479 case LookupResult::NotFound: 8480 case LookupResult::NotFoundInCurrentInstantiation: 8481 case LookupResult::Ambiguous: 8482 break; 8483 } 8484 Previous.suppressDiagnostics(); 8485 8486 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8487 // Maybe we will complain about the shadowed template parameter. 8488 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8489 // Just pretend that we didn't see the previous declaration. 8490 PrevDecl = 0; 8491 } 8492 8493 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8494 PrevDecl = 0; 8495 8496 bool Mutable 8497 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8498 SourceLocation TSSL = D.getSourceRange().getBegin(); 8499 FieldDecl *NewFD 8500 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8501 TSSL, AS, PrevDecl, &D); 8502 8503 if (NewFD->isInvalidDecl()) 8504 Record->setInvalidDecl(); 8505 8506 if (D.getDeclSpec().isModulePrivateSpecified()) 8507 NewFD->setModulePrivate(); 8508 8509 if (NewFD->isInvalidDecl() && PrevDecl) { 8510 // Don't introduce NewFD into scope; there's already something 8511 // with the same name in the same scope. 8512 } else if (II) { 8513 PushOnScopeChains(NewFD, S); 8514 } else 8515 Record->addDecl(NewFD); 8516 8517 return NewFD; 8518} 8519 8520/// \brief Build a new FieldDecl and check its well-formedness. 8521/// 8522/// This routine builds a new FieldDecl given the fields name, type, 8523/// record, etc. \p PrevDecl should refer to any previous declaration 8524/// with the same name and in the same scope as the field to be 8525/// created. 8526/// 8527/// \returns a new FieldDecl. 8528/// 8529/// \todo The Declarator argument is a hack. It will be removed once 8530FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8531 TypeSourceInfo *TInfo, 8532 RecordDecl *Record, SourceLocation Loc, 8533 bool Mutable, Expr *BitWidth, bool HasInit, 8534 SourceLocation TSSL, 8535 AccessSpecifier AS, NamedDecl *PrevDecl, 8536 Declarator *D) { 8537 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8538 bool InvalidDecl = false; 8539 if (D) InvalidDecl = D->isInvalidType(); 8540 8541 // If we receive a broken type, recover by assuming 'int' and 8542 // marking this declaration as invalid. 8543 if (T.isNull()) { 8544 InvalidDecl = true; 8545 T = Context.IntTy; 8546 } 8547 8548 QualType EltTy = Context.getBaseElementType(T); 8549 if (!EltTy->isDependentType() && 8550 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8551 // Fields of incomplete type force their record to be invalid. 8552 Record->setInvalidDecl(); 8553 InvalidDecl = true; 8554 } 8555 8556 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8557 // than a variably modified type. 8558 if (!InvalidDecl && T->isVariablyModifiedType()) { 8559 bool SizeIsNegative; 8560 llvm::APSInt Oversized; 8561 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8562 SizeIsNegative, 8563 Oversized); 8564 if (!FixedTy.isNull()) { 8565 Diag(Loc, diag::warn_illegal_constant_array_size); 8566 T = FixedTy; 8567 } else { 8568 if (SizeIsNegative) 8569 Diag(Loc, diag::err_typecheck_negative_array_size); 8570 else if (Oversized.getBoolValue()) 8571 Diag(Loc, diag::err_array_too_large) 8572 << Oversized.toString(10); 8573 else 8574 Diag(Loc, diag::err_typecheck_field_variable_size); 8575 InvalidDecl = true; 8576 } 8577 } 8578 8579 // Fields can not have abstract class types 8580 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8581 diag::err_abstract_type_in_decl, 8582 AbstractFieldType)) 8583 InvalidDecl = true; 8584 8585 bool ZeroWidth = false; 8586 // If this is declared as a bit-field, check the bit-field. 8587 if (!InvalidDecl && BitWidth && 8588 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8589 InvalidDecl = true; 8590 BitWidth = 0; 8591 ZeroWidth = false; 8592 } 8593 8594 // Check that 'mutable' is consistent with the type of the declaration. 8595 if (!InvalidDecl && Mutable) { 8596 unsigned DiagID = 0; 8597 if (T->isReferenceType()) 8598 DiagID = diag::err_mutable_reference; 8599 else if (T.isConstQualified()) 8600 DiagID = diag::err_mutable_const; 8601 8602 if (DiagID) { 8603 SourceLocation ErrLoc = Loc; 8604 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8605 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8606 Diag(ErrLoc, DiagID); 8607 Mutable = false; 8608 InvalidDecl = true; 8609 } 8610 } 8611 8612 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8613 BitWidth, Mutable, HasInit); 8614 if (InvalidDecl) 8615 NewFD->setInvalidDecl(); 8616 8617 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8618 Diag(Loc, diag::err_duplicate_member) << II; 8619 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8620 NewFD->setInvalidDecl(); 8621 } 8622 8623 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8624 if (Record->isUnion()) { 8625 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8626 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8627 if (RDecl->getDefinition()) { 8628 // C++ [class.union]p1: An object of a class with a non-trivial 8629 // constructor, a non-trivial copy constructor, a non-trivial 8630 // destructor, or a non-trivial copy assignment operator 8631 // cannot be a member of a union, nor can an array of such 8632 // objects. 8633 if (CheckNontrivialField(NewFD)) 8634 NewFD->setInvalidDecl(); 8635 } 8636 } 8637 8638 // C++ [class.union]p1: If a union contains a member of reference type, 8639 // the program is ill-formed. 8640 if (EltTy->isReferenceType()) { 8641 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8642 << NewFD->getDeclName() << EltTy; 8643 NewFD->setInvalidDecl(); 8644 } 8645 } 8646 } 8647 8648 // FIXME: We need to pass in the attributes given an AST 8649 // representation, not a parser representation. 8650 if (D) 8651 // FIXME: What to pass instead of TUScope? 8652 ProcessDeclAttributes(TUScope, NewFD, *D); 8653 8654 // In auto-retain/release, infer strong retension for fields of 8655 // retainable type. 8656 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8657 NewFD->setInvalidDecl(); 8658 8659 if (T.isObjCGCWeak()) 8660 Diag(Loc, diag::warn_attribute_weak_on_field); 8661 8662 NewFD->setAccess(AS); 8663 return NewFD; 8664} 8665 8666bool Sema::CheckNontrivialField(FieldDecl *FD) { 8667 assert(FD); 8668 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8669 8670 if (FD->isInvalidDecl()) 8671 return true; 8672 8673 QualType EltTy = Context.getBaseElementType(FD->getType()); 8674 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8675 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8676 if (RDecl->getDefinition()) { 8677 // We check for copy constructors before constructors 8678 // because otherwise we'll never get complaints about 8679 // copy constructors. 8680 8681 CXXSpecialMember member = CXXInvalid; 8682 if (!RDecl->hasTrivialCopyConstructor()) 8683 member = CXXCopyConstructor; 8684 else if (!RDecl->hasTrivialDefaultConstructor()) 8685 member = CXXDefaultConstructor; 8686 else if (!RDecl->hasTrivialCopyAssignment()) 8687 member = CXXCopyAssignment; 8688 else if (!RDecl->hasTrivialDestructor()) 8689 member = CXXDestructor; 8690 8691 if (member != CXXInvalid) { 8692 if (!getLangOptions().CPlusPlus0x && 8693 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8694 // Objective-C++ ARC: it is an error to have a non-trivial field of 8695 // a union. However, system headers in Objective-C programs 8696 // occasionally have Objective-C lifetime objects within unions, 8697 // and rather than cause the program to fail, we make those 8698 // members unavailable. 8699 SourceLocation Loc = FD->getLocation(); 8700 if (getSourceManager().isInSystemHeader(Loc)) { 8701 if (!FD->hasAttr<UnavailableAttr>()) 8702 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8703 "this system field has retaining ownership")); 8704 return false; 8705 } 8706 } 8707 8708 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8709 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8710 diag::err_illegal_union_or_anon_struct_member) 8711 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8712 DiagnoseNontrivial(RT, member); 8713 return !getLangOptions().CPlusPlus0x; 8714 } 8715 } 8716 } 8717 8718 return false; 8719} 8720 8721/// DiagnoseNontrivial - Given that a class has a non-trivial 8722/// special member, figure out why. 8723void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8724 QualType QT(T, 0U); 8725 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8726 8727 // Check whether the member was user-declared. 8728 switch (member) { 8729 case CXXInvalid: 8730 break; 8731 8732 case CXXDefaultConstructor: 8733 if (RD->hasUserDeclaredConstructor()) { 8734 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8735 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8736 const FunctionDecl *body = 0; 8737 ci->hasBody(body); 8738 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8739 SourceLocation CtorLoc = ci->getLocation(); 8740 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8741 return; 8742 } 8743 } 8744 8745 llvm_unreachable("found no user-declared constructors"); 8746 } 8747 break; 8748 8749 case CXXCopyConstructor: 8750 if (RD->hasUserDeclaredCopyConstructor()) { 8751 SourceLocation CtorLoc = 8752 RD->getCopyConstructor(0)->getLocation(); 8753 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8754 return; 8755 } 8756 break; 8757 8758 case CXXMoveConstructor: 8759 if (RD->hasUserDeclaredMoveConstructor()) { 8760 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8761 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8762 return; 8763 } 8764 break; 8765 8766 case CXXCopyAssignment: 8767 if (RD->hasUserDeclaredCopyAssignment()) { 8768 // FIXME: this should use the location of the copy 8769 // assignment, not the type. 8770 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8771 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8772 return; 8773 } 8774 break; 8775 8776 case CXXMoveAssignment: 8777 if (RD->hasUserDeclaredMoveAssignment()) { 8778 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8779 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8780 return; 8781 } 8782 break; 8783 8784 case CXXDestructor: 8785 if (RD->hasUserDeclaredDestructor()) { 8786 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8787 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8788 return; 8789 } 8790 break; 8791 } 8792 8793 typedef CXXRecordDecl::base_class_iterator base_iter; 8794 8795 // Virtual bases and members inhibit trivial copying/construction, 8796 // but not trivial destruction. 8797 if (member != CXXDestructor) { 8798 // Check for virtual bases. vbases includes indirect virtual bases, 8799 // so we just iterate through the direct bases. 8800 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8801 if (bi->isVirtual()) { 8802 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8803 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8804 return; 8805 } 8806 8807 // Check for virtual methods. 8808 typedef CXXRecordDecl::method_iterator meth_iter; 8809 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8810 ++mi) { 8811 if (mi->isVirtual()) { 8812 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8813 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8814 return; 8815 } 8816 } 8817 } 8818 8819 bool (CXXRecordDecl::*hasTrivial)() const; 8820 switch (member) { 8821 case CXXDefaultConstructor: 8822 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8823 case CXXCopyConstructor: 8824 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8825 case CXXCopyAssignment: 8826 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8827 case CXXDestructor: 8828 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8829 default: 8830 llvm_unreachable("unexpected special member"); 8831 } 8832 8833 // Check for nontrivial bases (and recurse). 8834 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8835 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8836 assert(BaseRT && "Don't know how to handle dependent bases"); 8837 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8838 if (!(BaseRecTy->*hasTrivial)()) { 8839 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8840 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8841 DiagnoseNontrivial(BaseRT, member); 8842 return; 8843 } 8844 } 8845 8846 // Check for nontrivial members (and recurse). 8847 typedef RecordDecl::field_iterator field_iter; 8848 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8849 ++fi) { 8850 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8851 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8852 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8853 8854 if (!(EltRD->*hasTrivial)()) { 8855 SourceLocation FLoc = (*fi)->getLocation(); 8856 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8857 DiagnoseNontrivial(EltRT, member); 8858 return; 8859 } 8860 } 8861 8862 if (EltTy->isObjCLifetimeType()) { 8863 switch (EltTy.getObjCLifetime()) { 8864 case Qualifiers::OCL_None: 8865 case Qualifiers::OCL_ExplicitNone: 8866 break; 8867 8868 case Qualifiers::OCL_Autoreleasing: 8869 case Qualifiers::OCL_Weak: 8870 case Qualifiers::OCL_Strong: 8871 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8872 << QT << EltTy.getObjCLifetime(); 8873 return; 8874 } 8875 } 8876 } 8877 8878 llvm_unreachable("found no explanation for non-trivial member"); 8879} 8880 8881/// TranslateIvarVisibility - Translate visibility from a token ID to an 8882/// AST enum value. 8883static ObjCIvarDecl::AccessControl 8884TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8885 switch (ivarVisibility) { 8886 default: llvm_unreachable("Unknown visitibility kind"); 8887 case tok::objc_private: return ObjCIvarDecl::Private; 8888 case tok::objc_public: return ObjCIvarDecl::Public; 8889 case tok::objc_protected: return ObjCIvarDecl::Protected; 8890 case tok::objc_package: return ObjCIvarDecl::Package; 8891 } 8892} 8893 8894/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8895/// in order to create an IvarDecl object for it. 8896Decl *Sema::ActOnIvar(Scope *S, 8897 SourceLocation DeclStart, 8898 Declarator &D, Expr *BitfieldWidth, 8899 tok::ObjCKeywordKind Visibility) { 8900 8901 IdentifierInfo *II = D.getIdentifier(); 8902 Expr *BitWidth = (Expr*)BitfieldWidth; 8903 SourceLocation Loc = DeclStart; 8904 if (II) Loc = D.getIdentifierLoc(); 8905 8906 // FIXME: Unnamed fields can be handled in various different ways, for 8907 // example, unnamed unions inject all members into the struct namespace! 8908 8909 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8910 QualType T = TInfo->getType(); 8911 8912 if (BitWidth) { 8913 // 6.7.2.1p3, 6.7.2.1p4 8914 if (VerifyBitField(Loc, II, T, BitWidth)) { 8915 D.setInvalidType(); 8916 BitWidth = 0; 8917 } 8918 } else { 8919 // Not a bitfield. 8920 8921 // validate II. 8922 8923 } 8924 if (T->isReferenceType()) { 8925 Diag(Loc, diag::err_ivar_reference_type); 8926 D.setInvalidType(); 8927 } 8928 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8929 // than a variably modified type. 8930 else if (T->isVariablyModifiedType()) { 8931 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8932 D.setInvalidType(); 8933 } 8934 8935 // Get the visibility (access control) for this ivar. 8936 ObjCIvarDecl::AccessControl ac = 8937 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8938 : ObjCIvarDecl::None; 8939 // Must set ivar's DeclContext to its enclosing interface. 8940 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8941 ObjCContainerDecl *EnclosingContext; 8942 if (ObjCImplementationDecl *IMPDecl = 8943 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8944 if (!LangOpts.ObjCNonFragileABI2) { 8945 // Case of ivar declared in an implementation. Context is that of its class. 8946 EnclosingContext = IMPDecl->getClassInterface(); 8947 assert(EnclosingContext && "Implementation has no class interface!"); 8948 } 8949 else 8950 EnclosingContext = EnclosingDecl; 8951 } else { 8952 if (ObjCCategoryDecl *CDecl = 8953 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8954 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8955 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8956 return 0; 8957 } 8958 } 8959 EnclosingContext = EnclosingDecl; 8960 } 8961 8962 // Construct the decl. 8963 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8964 DeclStart, Loc, II, T, 8965 TInfo, ac, (Expr *)BitfieldWidth); 8966 8967 if (II) { 8968 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8969 ForRedeclaration); 8970 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8971 && !isa<TagDecl>(PrevDecl)) { 8972 Diag(Loc, diag::err_duplicate_member) << II; 8973 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8974 NewID->setInvalidDecl(); 8975 } 8976 } 8977 8978 // Process attributes attached to the ivar. 8979 ProcessDeclAttributes(S, NewID, D); 8980 8981 if (D.isInvalidType()) 8982 NewID->setInvalidDecl(); 8983 8984 // In ARC, infer 'retaining' for ivars of retainable type. 8985 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8986 NewID->setInvalidDecl(); 8987 8988 if (D.getDeclSpec().isModulePrivateSpecified()) 8989 NewID->setModulePrivate(); 8990 8991 if (II) { 8992 // FIXME: When interfaces are DeclContexts, we'll need to add 8993 // these to the interface. 8994 S->AddDecl(NewID); 8995 IdResolver.AddDecl(NewID); 8996 } 8997 8998 return NewID; 8999} 9000 9001/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9002/// class and class extensions. For every class @interface and class 9003/// extension @interface, if the last ivar is a bitfield of any type, 9004/// then add an implicit `char :0` ivar to the end of that interface. 9005void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9006 SmallVectorImpl<Decl *> &AllIvarDecls) { 9007 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9008 return; 9009 9010 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9011 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9012 9013 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9014 return; 9015 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9016 if (!ID) { 9017 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9018 if (!CD->IsClassExtension()) 9019 return; 9020 } 9021 // No need to add this to end of @implementation. 9022 else 9023 return; 9024 } 9025 // All conditions are met. Add a new bitfield to the tail end of ivars. 9026 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9027 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9028 9029 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9030 DeclLoc, DeclLoc, 0, 9031 Context.CharTy, 9032 Context.getTrivialTypeSourceInfo(Context.CharTy, 9033 DeclLoc), 9034 ObjCIvarDecl::Private, BW, 9035 true); 9036 AllIvarDecls.push_back(Ivar); 9037} 9038 9039void Sema::ActOnFields(Scope* S, 9040 SourceLocation RecLoc, Decl *EnclosingDecl, 9041 llvm::ArrayRef<Decl *> Fields, 9042 SourceLocation LBrac, SourceLocation RBrac, 9043 AttributeList *Attr) { 9044 assert(EnclosingDecl && "missing record or interface decl"); 9045 9046 // If the decl this is being inserted into is invalid, then it may be a 9047 // redeclaration or some other bogus case. Don't try to add fields to it. 9048 if (EnclosingDecl->isInvalidDecl()) 9049 return; 9050 9051 // Verify that all the fields are okay. 9052 unsigned NumNamedMembers = 0; 9053 SmallVector<FieldDecl*, 32> RecFields; 9054 9055 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9056 bool ARCErrReported = false; 9057 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9058 i != end; ++i) { 9059 FieldDecl *FD = cast<FieldDecl>(*i); 9060 9061 // Get the type for the field. 9062 const Type *FDTy = FD->getType().getTypePtr(); 9063 9064 if (!FD->isAnonymousStructOrUnion()) { 9065 // Remember all fields written by the user. 9066 RecFields.push_back(FD); 9067 } 9068 9069 // If the field is already invalid for some reason, don't emit more 9070 // diagnostics about it. 9071 if (FD->isInvalidDecl()) { 9072 EnclosingDecl->setInvalidDecl(); 9073 continue; 9074 } 9075 9076 // C99 6.7.2.1p2: 9077 // A structure or union shall not contain a member with 9078 // incomplete or function type (hence, a structure shall not 9079 // contain an instance of itself, but may contain a pointer to 9080 // an instance of itself), except that the last member of a 9081 // structure with more than one named member may have incomplete 9082 // array type; such a structure (and any union containing, 9083 // possibly recursively, a member that is such a structure) 9084 // shall not be a member of a structure or an element of an 9085 // array. 9086 if (FDTy->isFunctionType()) { 9087 // Field declared as a function. 9088 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9089 << FD->getDeclName(); 9090 FD->setInvalidDecl(); 9091 EnclosingDecl->setInvalidDecl(); 9092 continue; 9093 } else if (FDTy->isIncompleteArrayType() && Record && 9094 ((i + 1 == Fields.end() && !Record->isUnion()) || 9095 ((getLangOptions().MicrosoftExt || 9096 getLangOptions().CPlusPlus) && 9097 (i + 1 == Fields.end() || Record->isUnion())))) { 9098 // Flexible array member. 9099 // Microsoft and g++ is more permissive regarding flexible array. 9100 // It will accept flexible array in union and also 9101 // as the sole element of a struct/class. 9102 if (getLangOptions().MicrosoftExt) { 9103 if (Record->isUnion()) 9104 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9105 << FD->getDeclName(); 9106 else if (Fields.size() == 1) 9107 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9108 << FD->getDeclName() << Record->getTagKind(); 9109 } else if (getLangOptions().CPlusPlus) { 9110 if (Record->isUnion()) 9111 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9112 << FD->getDeclName(); 9113 else if (Fields.size() == 1) 9114 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9115 << FD->getDeclName() << Record->getTagKind(); 9116 } else if (NumNamedMembers < 1) { 9117 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9118 << FD->getDeclName(); 9119 FD->setInvalidDecl(); 9120 EnclosingDecl->setInvalidDecl(); 9121 continue; 9122 } 9123 if (!FD->getType()->isDependentType() && 9124 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9125 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9126 << FD->getDeclName() << FD->getType(); 9127 FD->setInvalidDecl(); 9128 EnclosingDecl->setInvalidDecl(); 9129 continue; 9130 } 9131 // Okay, we have a legal flexible array member at the end of the struct. 9132 if (Record) 9133 Record->setHasFlexibleArrayMember(true); 9134 } else if (!FDTy->isDependentType() && 9135 RequireCompleteType(FD->getLocation(), FD->getType(), 9136 diag::err_field_incomplete)) { 9137 // Incomplete type 9138 FD->setInvalidDecl(); 9139 EnclosingDecl->setInvalidDecl(); 9140 continue; 9141 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9142 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9143 // If this is a member of a union, then entire union becomes "flexible". 9144 if (Record && Record->isUnion()) { 9145 Record->setHasFlexibleArrayMember(true); 9146 } else { 9147 // If this is a struct/class and this is not the last element, reject 9148 // it. Note that GCC supports variable sized arrays in the middle of 9149 // structures. 9150 if (i + 1 != Fields.end()) 9151 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9152 << FD->getDeclName() << FD->getType(); 9153 else { 9154 // We support flexible arrays at the end of structs in 9155 // other structs as an extension. 9156 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9157 << FD->getDeclName(); 9158 if (Record) 9159 Record->setHasFlexibleArrayMember(true); 9160 } 9161 } 9162 } 9163 if (Record && FDTTy->getDecl()->hasObjectMember()) 9164 Record->setHasObjectMember(true); 9165 } else if (FDTy->isObjCObjectType()) { 9166 /// A field cannot be an Objective-c object 9167 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9168 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9169 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9170 FD->setType(T); 9171 } 9172 else if (!getLangOptions().CPlusPlus) { 9173 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9174 // It's an error in ARC if a field has lifetime. 9175 // We don't want to report this in a system header, though, 9176 // so we just make the field unavailable. 9177 // FIXME: that's really not sufficient; we need to make the type 9178 // itself invalid to, say, initialize or copy. 9179 QualType T = FD->getType(); 9180 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9181 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9182 SourceLocation loc = FD->getLocation(); 9183 if (getSourceManager().isInSystemHeader(loc)) { 9184 if (!FD->hasAttr<UnavailableAttr>()) { 9185 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9186 "this system field has retaining ownership")); 9187 } 9188 } else { 9189 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9190 << T->isBlockPointerType(); 9191 } 9192 ARCErrReported = true; 9193 } 9194 } 9195 else if (getLangOptions().ObjC1 && 9196 getLangOptions().getGC() != LangOptions::NonGC && 9197 Record && !Record->hasObjectMember()) { 9198 if (FD->getType()->isObjCObjectPointerType() || 9199 FD->getType().isObjCGCStrong()) 9200 Record->setHasObjectMember(true); 9201 else if (Context.getAsArrayType(FD->getType())) { 9202 QualType BaseType = Context.getBaseElementType(FD->getType()); 9203 if (BaseType->isRecordType() && 9204 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9205 Record->setHasObjectMember(true); 9206 else if (BaseType->isObjCObjectPointerType() || 9207 BaseType.isObjCGCStrong()) 9208 Record->setHasObjectMember(true); 9209 } 9210 } 9211 } 9212 // Keep track of the number of named members. 9213 if (FD->getIdentifier()) 9214 ++NumNamedMembers; 9215 } 9216 9217 // Okay, we successfully defined 'Record'. 9218 if (Record) { 9219 bool Completed = false; 9220 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9221 if (!CXXRecord->isInvalidDecl()) { 9222 // Set access bits correctly on the directly-declared conversions. 9223 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9224 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9225 I != E; ++I) 9226 Convs->setAccess(I, (*I)->getAccess()); 9227 9228 if (!CXXRecord->isDependentType()) { 9229 // Objective-C Automatic Reference Counting: 9230 // If a class has a non-static data member of Objective-C pointer 9231 // type (or array thereof), it is a non-POD type and its 9232 // default constructor (if any), copy constructor, copy assignment 9233 // operator, and destructor are non-trivial. 9234 // 9235 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9236 // However, here we check whether this particular class is only 9237 // non-POD because of the presence of an Objective-C pointer member. 9238 // If so, objects of this type cannot be shared between code compiled 9239 // with instant objects and code compiled with manual retain/release. 9240 if (getLangOptions().ObjCAutoRefCount && 9241 CXXRecord->hasObjectMember() && 9242 CXXRecord->getLinkage() == ExternalLinkage) { 9243 if (CXXRecord->isPOD()) { 9244 Diag(CXXRecord->getLocation(), 9245 diag::warn_arc_non_pod_class_with_object_member) 9246 << CXXRecord; 9247 } else { 9248 // FIXME: Fix-Its would be nice here, but finding a good location 9249 // for them is going to be tricky. 9250 if (CXXRecord->hasTrivialCopyConstructor()) 9251 Diag(CXXRecord->getLocation(), 9252 diag::warn_arc_trivial_member_function_with_object_member) 9253 << CXXRecord << 0; 9254 if (CXXRecord->hasTrivialCopyAssignment()) 9255 Diag(CXXRecord->getLocation(), 9256 diag::warn_arc_trivial_member_function_with_object_member) 9257 << CXXRecord << 1; 9258 if (CXXRecord->hasTrivialDestructor()) 9259 Diag(CXXRecord->getLocation(), 9260 diag::warn_arc_trivial_member_function_with_object_member) 9261 << CXXRecord << 2; 9262 } 9263 } 9264 9265 // Adjust user-defined destructor exception spec. 9266 if (getLangOptions().CPlusPlus0x && 9267 CXXRecord->hasUserDeclaredDestructor()) 9268 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9269 9270 // Add any implicitly-declared members to this class. 9271 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9272 9273 // If we have virtual base classes, we may end up finding multiple 9274 // final overriders for a given virtual function. Check for this 9275 // problem now. 9276 if (CXXRecord->getNumVBases()) { 9277 CXXFinalOverriderMap FinalOverriders; 9278 CXXRecord->getFinalOverriders(FinalOverriders); 9279 9280 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9281 MEnd = FinalOverriders.end(); 9282 M != MEnd; ++M) { 9283 for (OverridingMethods::iterator SO = M->second.begin(), 9284 SOEnd = M->second.end(); 9285 SO != SOEnd; ++SO) { 9286 assert(SO->second.size() > 0 && 9287 "Virtual function without overridding functions?"); 9288 if (SO->second.size() == 1) 9289 continue; 9290 9291 // C++ [class.virtual]p2: 9292 // In a derived class, if a virtual member function of a base 9293 // class subobject has more than one final overrider the 9294 // program is ill-formed. 9295 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9296 << (NamedDecl *)M->first << Record; 9297 Diag(M->first->getLocation(), 9298 diag::note_overridden_virtual_function); 9299 for (OverridingMethods::overriding_iterator 9300 OM = SO->second.begin(), 9301 OMEnd = SO->second.end(); 9302 OM != OMEnd; ++OM) 9303 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9304 << (NamedDecl *)M->first << OM->Method->getParent(); 9305 9306 Record->setInvalidDecl(); 9307 } 9308 } 9309 CXXRecord->completeDefinition(&FinalOverriders); 9310 Completed = true; 9311 } 9312 } 9313 } 9314 } 9315 9316 if (!Completed) 9317 Record->completeDefinition(); 9318 9319 // Now that the record is complete, do any delayed exception spec checks 9320 // we were missing. 9321 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9322 const CXXDestructorDecl *Dtor = 9323 DelayedDestructorExceptionSpecChecks.back().first; 9324 if (Dtor->getParent() != Record) 9325 break; 9326 9327 assert(!Dtor->getParent()->isDependentType() && 9328 "Should not ever add destructors of templates into the list."); 9329 CheckOverridingFunctionExceptionSpec(Dtor, 9330 DelayedDestructorExceptionSpecChecks.back().second); 9331 DelayedDestructorExceptionSpecChecks.pop_back(); 9332 } 9333 9334 } else { 9335 ObjCIvarDecl **ClsFields = 9336 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9337 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9338 ID->setEndOfDefinitionLoc(RBrac); 9339 // Add ivar's to class's DeclContext. 9340 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9341 ClsFields[i]->setLexicalDeclContext(ID); 9342 ID->addDecl(ClsFields[i]); 9343 } 9344 // Must enforce the rule that ivars in the base classes may not be 9345 // duplicates. 9346 if (ID->getSuperClass()) 9347 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9348 } else if (ObjCImplementationDecl *IMPDecl = 9349 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9350 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9351 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9352 // Ivar declared in @implementation never belongs to the implementation. 9353 // Only it is in implementation's lexical context. 9354 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9355 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9356 } else if (ObjCCategoryDecl *CDecl = 9357 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9358 // case of ivars in class extension; all other cases have been 9359 // reported as errors elsewhere. 9360 // FIXME. Class extension does not have a LocEnd field. 9361 // CDecl->setLocEnd(RBrac); 9362 // Add ivar's to class extension's DeclContext. 9363 // Diagnose redeclaration of private ivars. 9364 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9365 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9366 if (IDecl) { 9367 if (const ObjCIvarDecl *ClsIvar = 9368 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9369 Diag(ClsFields[i]->getLocation(), 9370 diag::err_duplicate_ivar_declaration); 9371 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9372 continue; 9373 } 9374 for (const ObjCCategoryDecl *ClsExtDecl = 9375 IDecl->getFirstClassExtension(); 9376 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9377 if (const ObjCIvarDecl *ClsExtIvar = 9378 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9379 Diag(ClsFields[i]->getLocation(), 9380 diag::err_duplicate_ivar_declaration); 9381 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9382 continue; 9383 } 9384 } 9385 } 9386 ClsFields[i]->setLexicalDeclContext(CDecl); 9387 CDecl->addDecl(ClsFields[i]); 9388 } 9389 } 9390 } 9391 9392 if (Attr) 9393 ProcessDeclAttributeList(S, Record, Attr); 9394 9395 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9396 // set the visibility of this record. 9397 if (Record && !Record->getDeclContext()->isRecord()) 9398 AddPushedVisibilityAttribute(Record); 9399} 9400 9401/// \brief Determine whether the given integral value is representable within 9402/// the given type T. 9403static bool isRepresentableIntegerValue(ASTContext &Context, 9404 llvm::APSInt &Value, 9405 QualType T) { 9406 assert(T->isIntegralType(Context) && "Integral type required!"); 9407 unsigned BitWidth = Context.getIntWidth(T); 9408 9409 if (Value.isUnsigned() || Value.isNonNegative()) { 9410 if (T->isSignedIntegerOrEnumerationType()) 9411 --BitWidth; 9412 return Value.getActiveBits() <= BitWidth; 9413 } 9414 return Value.getMinSignedBits() <= BitWidth; 9415} 9416 9417// \brief Given an integral type, return the next larger integral type 9418// (or a NULL type of no such type exists). 9419static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9420 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9421 // enum checking below. 9422 assert(T->isIntegralType(Context) && "Integral type required!"); 9423 const unsigned NumTypes = 4; 9424 QualType SignedIntegralTypes[NumTypes] = { 9425 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9426 }; 9427 QualType UnsignedIntegralTypes[NumTypes] = { 9428 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9429 Context.UnsignedLongLongTy 9430 }; 9431 9432 unsigned BitWidth = Context.getTypeSize(T); 9433 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9434 : UnsignedIntegralTypes; 9435 for (unsigned I = 0; I != NumTypes; ++I) 9436 if (Context.getTypeSize(Types[I]) > BitWidth) 9437 return Types[I]; 9438 9439 return QualType(); 9440} 9441 9442EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9443 EnumConstantDecl *LastEnumConst, 9444 SourceLocation IdLoc, 9445 IdentifierInfo *Id, 9446 Expr *Val) { 9447 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9448 llvm::APSInt EnumVal(IntWidth); 9449 QualType EltTy; 9450 9451 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9452 Val = 0; 9453 9454 if (Val) 9455 Val = DefaultLvalueConversion(Val).take(); 9456 9457 if (Val) { 9458 if (Enum->isDependentType() || Val->isTypeDependent()) 9459 EltTy = Context.DependentTy; 9460 else { 9461 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9462 SourceLocation ExpLoc; 9463 if (!Val->isValueDependent() && 9464 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9465 Val = 0; 9466 } else { 9467 if (!getLangOptions().CPlusPlus) { 9468 // C99 6.7.2.2p2: 9469 // The expression that defines the value of an enumeration constant 9470 // shall be an integer constant expression that has a value 9471 // representable as an int. 9472 9473 // Complain if the value is not representable in an int. 9474 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9475 Diag(IdLoc, diag::ext_enum_value_not_int) 9476 << EnumVal.toString(10) << Val->getSourceRange() 9477 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9478 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9479 // Force the type of the expression to 'int'. 9480 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9481 } 9482 } 9483 9484 if (Enum->isFixed()) { 9485 EltTy = Enum->getIntegerType(); 9486 9487 // C++0x [dcl.enum]p5: 9488 // ... if the initializing value of an enumerator cannot be 9489 // represented by the underlying type, the program is ill-formed. 9490 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9491 if (getLangOptions().MicrosoftExt) { 9492 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9493 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9494 } else 9495 Diag(IdLoc, diag::err_enumerator_too_large) 9496 << EltTy; 9497 } else 9498 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9499 } 9500 else { 9501 // C++0x [dcl.enum]p5: 9502 // If the underlying type is not fixed, the type of each enumerator 9503 // is the type of its initializing value: 9504 // - If an initializer is specified for an enumerator, the 9505 // initializing value has the same type as the expression. 9506 EltTy = Val->getType(); 9507 } 9508 } 9509 } 9510 } 9511 9512 if (!Val) { 9513 if (Enum->isDependentType()) 9514 EltTy = Context.DependentTy; 9515 else if (!LastEnumConst) { 9516 // C++0x [dcl.enum]p5: 9517 // If the underlying type is not fixed, the type of each enumerator 9518 // is the type of its initializing value: 9519 // - If no initializer is specified for the first enumerator, the 9520 // initializing value has an unspecified integral type. 9521 // 9522 // GCC uses 'int' for its unspecified integral type, as does 9523 // C99 6.7.2.2p3. 9524 if (Enum->isFixed()) { 9525 EltTy = Enum->getIntegerType(); 9526 } 9527 else { 9528 EltTy = Context.IntTy; 9529 } 9530 } else { 9531 // Assign the last value + 1. 9532 EnumVal = LastEnumConst->getInitVal(); 9533 ++EnumVal; 9534 EltTy = LastEnumConst->getType(); 9535 9536 // Check for overflow on increment. 9537 if (EnumVal < LastEnumConst->getInitVal()) { 9538 // C++0x [dcl.enum]p5: 9539 // If the underlying type is not fixed, the type of each enumerator 9540 // is the type of its initializing value: 9541 // 9542 // - Otherwise the type of the initializing value is the same as 9543 // the type of the initializing value of the preceding enumerator 9544 // unless the incremented value is not representable in that type, 9545 // in which case the type is an unspecified integral type 9546 // sufficient to contain the incremented value. If no such type 9547 // exists, the program is ill-formed. 9548 QualType T = getNextLargerIntegralType(Context, EltTy); 9549 if (T.isNull() || Enum->isFixed()) { 9550 // There is no integral type larger enough to represent this 9551 // value. Complain, then allow the value to wrap around. 9552 EnumVal = LastEnumConst->getInitVal(); 9553 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9554 ++EnumVal; 9555 if (Enum->isFixed()) 9556 // When the underlying type is fixed, this is ill-formed. 9557 Diag(IdLoc, diag::err_enumerator_wrapped) 9558 << EnumVal.toString(10) 9559 << EltTy; 9560 else 9561 Diag(IdLoc, diag::warn_enumerator_too_large) 9562 << EnumVal.toString(10); 9563 } else { 9564 EltTy = T; 9565 } 9566 9567 // Retrieve the last enumerator's value, extent that type to the 9568 // type that is supposed to be large enough to represent the incremented 9569 // value, then increment. 9570 EnumVal = LastEnumConst->getInitVal(); 9571 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9572 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9573 ++EnumVal; 9574 9575 // If we're not in C++, diagnose the overflow of enumerator values, 9576 // which in C99 means that the enumerator value is not representable in 9577 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9578 // permits enumerator values that are representable in some larger 9579 // integral type. 9580 if (!getLangOptions().CPlusPlus && !T.isNull()) 9581 Diag(IdLoc, diag::warn_enum_value_overflow); 9582 } else if (!getLangOptions().CPlusPlus && 9583 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9584 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9585 Diag(IdLoc, diag::ext_enum_value_not_int) 9586 << EnumVal.toString(10) << 1; 9587 } 9588 } 9589 } 9590 9591 if (!EltTy->isDependentType()) { 9592 // Make the enumerator value match the signedness and size of the 9593 // enumerator's type. 9594 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9595 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9596 } 9597 9598 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9599 Val, EnumVal); 9600} 9601 9602 9603Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9604 SourceLocation IdLoc, IdentifierInfo *Id, 9605 AttributeList *Attr, 9606 SourceLocation EqualLoc, Expr *val) { 9607 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9608 EnumConstantDecl *LastEnumConst = 9609 cast_or_null<EnumConstantDecl>(lastEnumConst); 9610 Expr *Val = static_cast<Expr*>(val); 9611 9612 // The scope passed in may not be a decl scope. Zip up the scope tree until 9613 // we find one that is. 9614 S = getNonFieldDeclScope(S); 9615 9616 // Verify that there isn't already something declared with this name in this 9617 // scope. 9618 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9619 ForRedeclaration); 9620 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9621 // Maybe we will complain about the shadowed template parameter. 9622 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9623 // Just pretend that we didn't see the previous declaration. 9624 PrevDecl = 0; 9625 } 9626 9627 if (PrevDecl) { 9628 // When in C++, we may get a TagDecl with the same name; in this case the 9629 // enum constant will 'hide' the tag. 9630 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9631 "Received TagDecl when not in C++!"); 9632 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9633 if (isa<EnumConstantDecl>(PrevDecl)) 9634 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9635 else 9636 Diag(IdLoc, diag::err_redefinition) << Id; 9637 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9638 return 0; 9639 } 9640 } 9641 9642 // C++ [class.mem]p13: 9643 // If T is the name of a class, then each of the following shall have a 9644 // name different from T: 9645 // - every enumerator of every member of class T that is an enumerated 9646 // type 9647 if (CXXRecordDecl *Record 9648 = dyn_cast<CXXRecordDecl>( 9649 TheEnumDecl->getDeclContext()->getRedeclContext())) 9650 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9651 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9652 9653 EnumConstantDecl *New = 9654 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9655 9656 if (New) { 9657 // Process attributes. 9658 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9659 9660 // Register this decl in the current scope stack. 9661 New->setAccess(TheEnumDecl->getAccess()); 9662 PushOnScopeChains(New, S); 9663 } 9664 9665 return New; 9666} 9667 9668void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9669 SourceLocation RBraceLoc, Decl *EnumDeclX, 9670 Decl **Elements, unsigned NumElements, 9671 Scope *S, AttributeList *Attr) { 9672 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9673 QualType EnumType = Context.getTypeDeclType(Enum); 9674 9675 if (Attr) 9676 ProcessDeclAttributeList(S, Enum, Attr); 9677 9678 if (Enum->isDependentType()) { 9679 for (unsigned i = 0; i != NumElements; ++i) { 9680 EnumConstantDecl *ECD = 9681 cast_or_null<EnumConstantDecl>(Elements[i]); 9682 if (!ECD) continue; 9683 9684 ECD->setType(EnumType); 9685 } 9686 9687 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9688 return; 9689 } 9690 9691 // TODO: If the result value doesn't fit in an int, it must be a long or long 9692 // long value. ISO C does not support this, but GCC does as an extension, 9693 // emit a warning. 9694 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9695 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9696 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9697 9698 // Verify that all the values are okay, compute the size of the values, and 9699 // reverse the list. 9700 unsigned NumNegativeBits = 0; 9701 unsigned NumPositiveBits = 0; 9702 9703 // Keep track of whether all elements have type int. 9704 bool AllElementsInt = true; 9705 9706 for (unsigned i = 0; i != NumElements; ++i) { 9707 EnumConstantDecl *ECD = 9708 cast_or_null<EnumConstantDecl>(Elements[i]); 9709 if (!ECD) continue; // Already issued a diagnostic. 9710 9711 const llvm::APSInt &InitVal = ECD->getInitVal(); 9712 9713 // Keep track of the size of positive and negative values. 9714 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9715 NumPositiveBits = std::max(NumPositiveBits, 9716 (unsigned)InitVal.getActiveBits()); 9717 else 9718 NumNegativeBits = std::max(NumNegativeBits, 9719 (unsigned)InitVal.getMinSignedBits()); 9720 9721 // Keep track of whether every enum element has type int (very commmon). 9722 if (AllElementsInt) 9723 AllElementsInt = ECD->getType() == Context.IntTy; 9724 } 9725 9726 // Figure out the type that should be used for this enum. 9727 QualType BestType; 9728 unsigned BestWidth; 9729 9730 // C++0x N3000 [conv.prom]p3: 9731 // An rvalue of an unscoped enumeration type whose underlying 9732 // type is not fixed can be converted to an rvalue of the first 9733 // of the following types that can represent all the values of 9734 // the enumeration: int, unsigned int, long int, unsigned long 9735 // int, long long int, or unsigned long long int. 9736 // C99 6.4.4.3p2: 9737 // An identifier declared as an enumeration constant has type int. 9738 // The C99 rule is modified by a gcc extension 9739 QualType BestPromotionType; 9740 9741 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9742 // -fshort-enums is the equivalent to specifying the packed attribute on all 9743 // enum definitions. 9744 if (LangOpts.ShortEnums) 9745 Packed = true; 9746 9747 if (Enum->isFixed()) { 9748 BestType = Enum->getIntegerType(); 9749 if (BestType->isPromotableIntegerType()) 9750 BestPromotionType = Context.getPromotedIntegerType(BestType); 9751 else 9752 BestPromotionType = BestType; 9753 // We don't need to set BestWidth, because BestType is going to be the type 9754 // of the enumerators, but we do anyway because otherwise some compilers 9755 // warn that it might be used uninitialized. 9756 BestWidth = CharWidth; 9757 } 9758 else if (NumNegativeBits) { 9759 // If there is a negative value, figure out the smallest integer type (of 9760 // int/long/longlong) that fits. 9761 // If it's packed, check also if it fits a char or a short. 9762 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9763 BestType = Context.SignedCharTy; 9764 BestWidth = CharWidth; 9765 } else if (Packed && NumNegativeBits <= ShortWidth && 9766 NumPositiveBits < ShortWidth) { 9767 BestType = Context.ShortTy; 9768 BestWidth = ShortWidth; 9769 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9770 BestType = Context.IntTy; 9771 BestWidth = IntWidth; 9772 } else { 9773 BestWidth = Context.getTargetInfo().getLongWidth(); 9774 9775 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9776 BestType = Context.LongTy; 9777 } else { 9778 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9779 9780 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9781 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9782 BestType = Context.LongLongTy; 9783 } 9784 } 9785 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9786 } else { 9787 // If there is no negative value, figure out the smallest type that fits 9788 // all of the enumerator values. 9789 // If it's packed, check also if it fits a char or a short. 9790 if (Packed && NumPositiveBits <= CharWidth) { 9791 BestType = Context.UnsignedCharTy; 9792 BestPromotionType = Context.IntTy; 9793 BestWidth = CharWidth; 9794 } else if (Packed && NumPositiveBits <= ShortWidth) { 9795 BestType = Context.UnsignedShortTy; 9796 BestPromotionType = Context.IntTy; 9797 BestWidth = ShortWidth; 9798 } else if (NumPositiveBits <= IntWidth) { 9799 BestType = Context.UnsignedIntTy; 9800 BestWidth = IntWidth; 9801 BestPromotionType 9802 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9803 ? Context.UnsignedIntTy : Context.IntTy; 9804 } else if (NumPositiveBits <= 9805 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9806 BestType = Context.UnsignedLongTy; 9807 BestPromotionType 9808 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9809 ? Context.UnsignedLongTy : Context.LongTy; 9810 } else { 9811 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9812 assert(NumPositiveBits <= BestWidth && 9813 "How could an initializer get larger than ULL?"); 9814 BestType = Context.UnsignedLongLongTy; 9815 BestPromotionType 9816 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9817 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9818 } 9819 } 9820 9821 // Loop over all of the enumerator constants, changing their types to match 9822 // the type of the enum if needed. 9823 for (unsigned i = 0; i != NumElements; ++i) { 9824 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9825 if (!ECD) continue; // Already issued a diagnostic. 9826 9827 // Standard C says the enumerators have int type, but we allow, as an 9828 // extension, the enumerators to be larger than int size. If each 9829 // enumerator value fits in an int, type it as an int, otherwise type it the 9830 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9831 // that X has type 'int', not 'unsigned'. 9832 9833 // Determine whether the value fits into an int. 9834 llvm::APSInt InitVal = ECD->getInitVal(); 9835 9836 // If it fits into an integer type, force it. Otherwise force it to match 9837 // the enum decl type. 9838 QualType NewTy; 9839 unsigned NewWidth; 9840 bool NewSign; 9841 if (!getLangOptions().CPlusPlus && 9842 !Enum->isFixed() && 9843 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9844 NewTy = Context.IntTy; 9845 NewWidth = IntWidth; 9846 NewSign = true; 9847 } else if (ECD->getType() == BestType) { 9848 // Already the right type! 9849 if (getLangOptions().CPlusPlus) 9850 // C++ [dcl.enum]p4: Following the closing brace of an 9851 // enum-specifier, each enumerator has the type of its 9852 // enumeration. 9853 ECD->setType(EnumType); 9854 continue; 9855 } else { 9856 NewTy = BestType; 9857 NewWidth = BestWidth; 9858 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9859 } 9860 9861 // Adjust the APSInt value. 9862 InitVal = InitVal.extOrTrunc(NewWidth); 9863 InitVal.setIsSigned(NewSign); 9864 ECD->setInitVal(InitVal); 9865 9866 // Adjust the Expr initializer and type. 9867 if (ECD->getInitExpr() && 9868 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9869 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9870 CK_IntegralCast, 9871 ECD->getInitExpr(), 9872 /*base paths*/ 0, 9873 VK_RValue)); 9874 if (getLangOptions().CPlusPlus) 9875 // C++ [dcl.enum]p4: Following the closing brace of an 9876 // enum-specifier, each enumerator has the type of its 9877 // enumeration. 9878 ECD->setType(EnumType); 9879 else 9880 ECD->setType(NewTy); 9881 } 9882 9883 Enum->completeDefinition(BestType, BestPromotionType, 9884 NumPositiveBits, NumNegativeBits); 9885} 9886 9887Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9888 SourceLocation StartLoc, 9889 SourceLocation EndLoc) { 9890 StringLiteral *AsmString = cast<StringLiteral>(expr); 9891 9892 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9893 AsmString, StartLoc, 9894 EndLoc); 9895 CurContext->addDecl(New); 9896 return New; 9897} 9898 9899DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, ModuleIdPath Path) { 9900 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9901 Module::AllVisible, 9902 /*IsIncludeDirective=*/false); 9903 if (!Mod) 9904 return true; 9905 9906 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9907 Module *ModCheck = Mod; 9908 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9909 // If we've run out of module parents, just drop the remaining identifiers. 9910 // We need the length to be consistent. 9911 if (!ModCheck) 9912 break; 9913 ModCheck = ModCheck->Parent; 9914 9915 IdentifierLocs.push_back(Path[I].second); 9916 } 9917 9918 ImportDecl *Import = ImportDecl::Create(Context, 9919 Context.getTranslationUnitDecl(), 9920 ImportLoc, Mod, 9921 IdentifierLocs); 9922 Context.getTranslationUnitDecl()->addDecl(Import); 9923 return Import; 9924} 9925 9926void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9927 SourceLocation PragmaLoc, 9928 SourceLocation NameLoc) { 9929 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9930 9931 if (PrevDecl) { 9932 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9933 } else { 9934 (void)WeakUndeclaredIdentifiers.insert( 9935 std::pair<IdentifierInfo*,WeakInfo> 9936 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9937 } 9938} 9939 9940void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9941 IdentifierInfo* AliasName, 9942 SourceLocation PragmaLoc, 9943 SourceLocation NameLoc, 9944 SourceLocation AliasNameLoc) { 9945 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9946 LookupOrdinaryName); 9947 WeakInfo W = WeakInfo(Name, NameLoc); 9948 9949 if (PrevDecl) { 9950 if (!PrevDecl->hasAttr<AliasAttr>()) 9951 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9952 DeclApplyPragmaWeak(TUScope, ND, W); 9953 } else { 9954 (void)WeakUndeclaredIdentifiers.insert( 9955 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9956 } 9957} 9958 9959Decl *Sema::getObjCDeclContext() const { 9960 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9961} 9962 9963AvailabilityResult Sema::getCurContextAvailability() const { 9964 const Decl *D = cast<Decl>(getCurLexicalContext()); 9965 // A category implicitly has the availability of the interface. 9966 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9967 D = CatD->getClassInterface(); 9968 9969 return D->getAvailability(); 9970} 9971