SemaDecl.cpp revision 8d267c57afb3af418ed5281b7a9bb4555d701a82
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/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 // Determine where we will perform name lookup. 75 DeclContext *LookupCtx = 0; 76 if (ObjectTypePtr) { 77 QualType ObjectType = ObjectTypePtr.get(); 78 if (ObjectType->isRecordType()) 79 LookupCtx = computeDeclContext(ObjectType); 80 } else if (SS && SS->isNotEmpty()) { 81 LookupCtx = computeDeclContext(*SS, false); 82 83 if (!LookupCtx) { 84 if (isDependentScopeSpecifier(*SS)) { 85 // C++ [temp.res]p3: 86 // A qualified-id that refers to a type and in which the 87 // nested-name-specifier depends on a template-parameter (14.6.2) 88 // shall be prefixed by the keyword typename to indicate that the 89 // qualified-id denotes a type, forming an 90 // elaborated-type-specifier (7.1.5.3). 91 // 92 // We therefore do not perform any name lookup if the result would 93 // refer to a member of an unknown specialization. 94 if (!isClassName) 95 return ParsedType(); 96 97 // We know from the grammar that this name refers to a type, 98 // so build a dependent node to describe the type. 99 if (WantNontrivialTypeSourceInfo) 100 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 101 102 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 103 QualType T = 104 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 105 II, NameLoc); 106 107 return ParsedType::make(T); 108 } 109 110 return ParsedType(); 111 } 112 113 if (!LookupCtx->isDependentContext() && 114 RequireCompleteDeclContext(*SS, LookupCtx)) 115 return ParsedType(); 116 } 117 118 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 119 // lookup for class-names. 120 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 121 LookupOrdinaryName; 122 LookupResult Result(*this, &II, NameLoc, Kind); 123 if (LookupCtx) { 124 // Perform "qualified" name lookup into the declaration context we 125 // computed, which is either the type of the base of a member access 126 // expression or the declaration context associated with a prior 127 // nested-name-specifier. 128 LookupQualifiedName(Result, LookupCtx); 129 130 if (ObjectTypePtr && Result.empty()) { 131 // C++ [basic.lookup.classref]p3: 132 // If the unqualified-id is ~type-name, the type-name is looked up 133 // in the context of the entire postfix-expression. If the type T of 134 // the object expression is of a class type C, the type-name is also 135 // looked up in the scope of class C. At least one of the lookups shall 136 // find a name that refers to (possibly cv-qualified) T. 137 LookupName(Result, S); 138 } 139 } else { 140 // Perform unqualified name lookup. 141 LookupName(Result, S); 142 } 143 144 NamedDecl *IIDecl = 0; 145 switch (Result.getResultKind()) { 146 case LookupResult::NotFound: 147 case LookupResult::NotFoundInCurrentInstantiation: 148 case LookupResult::FoundOverloaded: 149 case LookupResult::FoundUnresolvedValue: 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 153 case LookupResult::Ambiguous: 154 // Recover from type-hiding ambiguities by hiding the type. We'll 155 // do the lookup again when looking for an object, and we can 156 // diagnose the error then. If we don't do this, then the error 157 // about hiding the type will be immediately followed by an error 158 // that only makes sense if the identifier was treated like a type. 159 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 160 Result.suppressDiagnostics(); 161 return ParsedType(); 162 } 163 164 // Look to see if we have a type anywhere in the list of results. 165 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 166 Res != ResEnd; ++Res) { 167 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 168 if (!IIDecl || 169 (*Res)->getLocation().getRawEncoding() < 170 IIDecl->getLocation().getRawEncoding()) 171 IIDecl = *Res; 172 } 173 } 174 175 if (!IIDecl) { 176 // None of the entities we found is a type, so there is no way 177 // to even assume that the result is a type. In this case, don't 178 // complain about the ambiguity. The parser will either try to 179 // perform this lookup again (e.g., as an object name), which 180 // will produce the ambiguity, or will complain that it expected 181 // a type name. 182 Result.suppressDiagnostics(); 183 return ParsedType(); 184 } 185 186 // We found a type within the ambiguous lookup; diagnose the 187 // ambiguity and then return that type. This might be the right 188 // answer, or it might not be, but it suppresses any attempt to 189 // perform the name lookup again. 190 break; 191 192 case LookupResult::Found: 193 IIDecl = Result.getFoundDecl(); 194 break; 195 } 196 197 assert(IIDecl && "Didn't find decl"); 198 199 QualType T; 200 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 201 DiagnoseUseOfDecl(IIDecl, NameLoc); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS && SS->isNotEmpty()) { 207 if (WantNontrivialTypeSourceInfo) { 208 // Construct a type with type-source information. 209 TypeLocBuilder Builder; 210 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 211 212 T = getElaboratedType(ETK_None, *SS, T); 213 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 214 ElabTL.setKeywordLoc(SourceLocation()); 215 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 216 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 217 } else { 218 T = getElaboratedType(ETK_None, *SS, T); 219 } 220 } 221 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 222 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 223 if (!HasTrailingDot) 224 T = Context.getObjCInterfaceType(IDecl); 225 } 226 227 if (T.isNull()) { 228 // If it's not plausibly a type, suppress diagnostics. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 return ParsedType::make(T); 233} 234 235/// isTagName() - This method is called *for error recovery purposes only* 236/// to determine if the specified name is a valid tag name ("struct foo"). If 237/// so, this returns the TST for the tag corresponding to it (TST_enum, 238/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 239/// where the user forgot to specify the tag. 240DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 241 // Do a tag name lookup in this scope. 242 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 243 LookupName(R, S, false); 244 R.suppressDiagnostics(); 245 if (R.getResultKind() == LookupResult::Found) 246 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 247 switch (TD->getTagKind()) { 248 default: return DeclSpec::TST_unspecified; 249 case TTK_Struct: return DeclSpec::TST_struct; 250 case TTK_Union: return DeclSpec::TST_union; 251 case TTK_Class: return DeclSpec::TST_class; 252 case TTK_Enum: return DeclSpec::TST_enum; 253 } 254 } 255 256 return DeclSpec::TST_unspecified; 257} 258 259/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 260/// if a CXXScopeSpec's type is equal to the type of one of the base classes 261/// then downgrade the missing typename error to a warning. 262/// This is needed for MSVC compatibility; Example: 263/// @code 264/// template<class T> class A { 265/// public: 266/// typedef int TYPE; 267/// }; 268/// template<class T> class B : public A<T> { 269/// public: 270/// A<T>::TYPE a; // no typename required because A<T> is a base class. 271/// }; 272/// @endcode 273bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 274 if (CurContext->isRecord()) { 275 const Type *Ty = SS->getScopeRep()->getAsType(); 276 277 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 278 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 279 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 280 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 281 return true; 282 } 283 return false; 284} 285 286bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 287 SourceLocation IILoc, 288 Scope *S, 289 CXXScopeSpec *SS, 290 ParsedType &SuggestedType) { 291 // We don't have anything to suggest (yet). 292 SuggestedType = ParsedType(); 293 294 // There may have been a typo in the name of the type. Look up typo 295 // results, in case we have something that we can suggest. 296 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 297 LookupOrdinaryName, S, SS, NULL, 298 false, CTC_Type)) { 299 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 300 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 301 302 if (Corrected.isKeyword()) { 303 // We corrected to a keyword. 304 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 305 Diag(IILoc, diag::err_unknown_typename_suggest) 306 << &II << CorrectedQuotedStr; 307 return true; 308 } else { 309 NamedDecl *Result = Corrected.getCorrectionDecl(); 310 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 311 !Result->isInvalidDecl()) { 312 // We found a similarly-named type or interface; suggest that. 313 if (!SS || !SS->isSet()) 314 Diag(IILoc, diag::err_unknown_typename_suggest) 315 << &II << CorrectedQuotedStr 316 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 317 else if (DeclContext *DC = computeDeclContext(*SS, false)) 318 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 319 << &II << DC << CorrectedQuotedStr << SS->getRange() 320 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 321 else 322 llvm_unreachable("could not have corrected a typo here"); 323 324 Diag(Result->getLocation(), diag::note_previous_decl) 325 << CorrectedQuotedStr; 326 327 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 328 false, false, ParsedType(), 329 /*NonTrivialTypeSourceInfo=*/true); 330 return true; 331 } 332 } 333 } 334 335 if (getLangOptions().CPlusPlus) { 336 // See if II is a class template that the user forgot to pass arguments to. 337 UnqualifiedId Name; 338 Name.setIdentifier(&II, IILoc); 339 CXXScopeSpec EmptySS; 340 TemplateTy TemplateResult; 341 bool MemberOfUnknownSpecialization; 342 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 343 Name, ParsedType(), true, TemplateResult, 344 MemberOfUnknownSpecialization) == TNK_Type_template) { 345 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 346 Diag(IILoc, diag::err_template_missing_args) << TplName; 347 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 348 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 349 << TplDecl->getTemplateParameters()->getSourceRange(); 350 } 351 return true; 352 } 353 } 354 355 // FIXME: Should we move the logic that tries to recover from a missing tag 356 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 357 358 if (!SS || (!SS->isSet() && !SS->isInvalid())) 359 Diag(IILoc, diag::err_unknown_typename) << &II; 360 else if (DeclContext *DC = computeDeclContext(*SS, false)) 361 Diag(IILoc, diag::err_typename_nested_not_found) 362 << &II << DC << SS->getRange(); 363 else if (isDependentScopeSpecifier(*SS)) { 364 unsigned DiagID = diag::err_typename_missing; 365 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 366 DiagID = diag::warn_typename_missing; 367 368 Diag(SS->getRange().getBegin(), DiagID) 369 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 370 << SourceRange(SS->getRange().getBegin(), IILoc) 371 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 372 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 373 } else { 374 assert(SS && SS->isInvalid() && 375 "Invalid scope specifier has already been diagnosed"); 376 } 377 378 return true; 379} 380 381/// \brief Determine whether the given result set contains either a type name 382/// or 383static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 384 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 385 NextToken.is(tok::less); 386 387 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 388 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 389 return true; 390 391 if (CheckTemplate && isa<TemplateDecl>(*I)) 392 return true; 393 } 394 395 return false; 396} 397 398Sema::NameClassification Sema::ClassifyName(Scope *S, 399 CXXScopeSpec &SS, 400 IdentifierInfo *&Name, 401 SourceLocation NameLoc, 402 const Token &NextToken) { 403 DeclarationNameInfo NameInfo(Name, NameLoc); 404 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 405 406 if (NextToken.is(tok::coloncolon)) { 407 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 408 QualType(), false, SS, 0, false); 409 410 } 411 412 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 413 LookupParsedName(Result, S, &SS, !CurMethod); 414 415 // Perform lookup for Objective-C instance variables (including automatically 416 // synthesized instance variables), if we're in an Objective-C method. 417 // FIXME: This lookup really, really needs to be folded in to the normal 418 // unqualified lookup mechanism. 419 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 420 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 421 if (E.get() || E.isInvalid()) 422 return E; 423 } 424 425 bool SecondTry = false; 426 bool IsFilteredTemplateName = false; 427 428Corrected: 429 switch (Result.getResultKind()) { 430 case LookupResult::NotFound: 431 // If an unqualified-id is followed by a '(', then we have a function 432 // call. 433 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 434 // In C++, this is an ADL-only call. 435 // FIXME: Reference? 436 if (getLangOptions().CPlusPlus) 437 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 438 439 // C90 6.3.2.2: 440 // If the expression that precedes the parenthesized argument list in a 441 // function call consists solely of an identifier, and if no 442 // declaration is visible for this identifier, the identifier is 443 // implicitly declared exactly as if, in the innermost block containing 444 // the function call, the declaration 445 // 446 // extern int identifier (); 447 // 448 // appeared. 449 // 450 // We also allow this in C99 as an extension. 451 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 452 Result.addDecl(D); 453 Result.resolveKind(); 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 455 } 456 } 457 458 // In C, we first see whether there is a tag type by the same name, in 459 // which case it's likely that the user just forget to write "enum", 460 // "struct", or "union". 461 if (!getLangOptions().CPlusPlus && !SecondTry) { 462 Result.clear(LookupTagName); 463 LookupParsedName(Result, S, &SS); 464 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 465 const char *TagName = 0; 466 const char *FixItTagName = 0; 467 switch (Tag->getTagKind()) { 468 case TTK_Class: 469 TagName = "class"; 470 FixItTagName = "class "; 471 break; 472 473 case TTK_Enum: 474 TagName = "enum"; 475 FixItTagName = "enum "; 476 break; 477 478 case TTK_Struct: 479 TagName = "struct"; 480 FixItTagName = "struct "; 481 break; 482 483 case TTK_Union: 484 TagName = "union"; 485 FixItTagName = "union "; 486 break; 487 } 488 489 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 490 << Name << TagName << getLangOptions().CPlusPlus 491 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 492 break; 493 } 494 495 Result.clear(LookupOrdinaryName); 496 } 497 498 // Perform typo correction to determine if there is another name that is 499 // close to this name. 500 if (!SecondTry) { 501 SecondTry = true; 502 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 503 Result.getLookupKind(), S, &SS)) { 504 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 505 unsigned QualifiedDiag = diag::err_no_member_suggest; 506 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 507 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 508 509 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 510 NamedDecl *UnderlyingFirstDecl 511 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 512 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 513 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 514 UnqualifiedDiag = diag::err_no_template_suggest; 515 QualifiedDiag = diag::err_no_member_template_suggest; 516 } else if (UnderlyingFirstDecl && 517 (isa<TypeDecl>(UnderlyingFirstDecl) || 518 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 519 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 520 UnqualifiedDiag = diag::err_unknown_typename_suggest; 521 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 522 } 523 524 if (SS.isEmpty()) 525 Diag(NameLoc, UnqualifiedDiag) 526 << Name << CorrectedQuotedStr 527 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 528 else 529 Diag(NameLoc, QualifiedDiag) 530 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 531 << SS.getRange() 532 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 533 534 // Update the name, so that the caller has the new name. 535 Name = Corrected.getCorrectionAsIdentifierInfo(); 536 537 // Also update the LookupResult... 538 // FIXME: This should probably go away at some point 539 Result.clear(); 540 Result.setLookupName(Corrected.getCorrection()); 541 if (FirstDecl) Result.addDecl(FirstDecl); 542 543 // Typo correction corrected to a keyword. 544 if (Corrected.isKeyword()) 545 return Corrected.getCorrectionAsIdentifierInfo(); 546 547 if (FirstDecl) 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << CorrectedQuotedStr; 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 return DC->getLexicalParent(); 724} 725 726void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 727 assert(getContainingDC(DC) == CurContext && 728 "The next DeclContext should be lexically contained in the current one."); 729 CurContext = DC; 730 S->setEntity(DC); 731} 732 733void Sema::PopDeclContext() { 734 assert(CurContext && "DeclContext imbalance!"); 735 736 CurContext = getContainingDC(CurContext); 737 assert(CurContext && "Popped translation unit!"); 738} 739 740/// EnterDeclaratorContext - Used when we must lookup names in the context 741/// of a declarator's nested name specifier. 742/// 743void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 744 // C++0x [basic.lookup.unqual]p13: 745 // A name used in the definition of a static data member of class 746 // X (after the qualified-id of the static member) is looked up as 747 // if the name was used in a member function of X. 748 // C++0x [basic.lookup.unqual]p14: 749 // If a variable member of a namespace is defined outside of the 750 // scope of its namespace then any name used in the definition of 751 // the variable member (after the declarator-id) is looked up as 752 // if the definition of the variable member occurred in its 753 // namespace. 754 // Both of these imply that we should push a scope whose context 755 // is the semantic context of the declaration. We can't use 756 // PushDeclContext here because that context is not necessarily 757 // lexically contained in the current context. Fortunately, 758 // the containing scope should have the appropriate information. 759 760 assert(!S->getEntity() && "scope already has entity"); 761 762#ifndef NDEBUG 763 Scope *Ancestor = S->getParent(); 764 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 765 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 766#endif 767 768 CurContext = DC; 769 S->setEntity(DC); 770} 771 772void Sema::ExitDeclaratorContext(Scope *S) { 773 assert(S->getEntity() == CurContext && "Context imbalance!"); 774 775 // Switch back to the lexical context. The safety of this is 776 // enforced by an assert in EnterDeclaratorContext. 777 Scope *Ancestor = S->getParent(); 778 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 779 CurContext = (DeclContext*) Ancestor->getEntity(); 780 781 // We don't need to do anything with the scope, which is going to 782 // disappear. 783} 784 785 786void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 787 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 788 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 789 // We assume that the caller has already called 790 // ActOnReenterTemplateScope 791 FD = TFD->getTemplatedDecl(); 792 } 793 if (!FD) 794 return; 795 796 PushDeclContext(S, FD); 797 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 798 ParmVarDecl *Param = FD->getParamDecl(P); 799 // If the parameter has an identifier, then add it to the scope 800 if (Param->getIdentifier()) { 801 S->AddDecl(Param); 802 IdResolver.AddDecl(Param); 803 } 804 } 805} 806 807 808/// \brief Determine whether we allow overloading of the function 809/// PrevDecl with another declaration. 810/// 811/// This routine determines whether overloading is possible, not 812/// whether some new function is actually an overload. It will return 813/// true in C++ (where we can always provide overloads) or, as an 814/// extension, in C when the previous function is already an 815/// overloaded function declaration or has the "overloadable" 816/// attribute. 817static bool AllowOverloadingOfFunction(LookupResult &Previous, 818 ASTContext &Context) { 819 if (Context.getLangOptions().CPlusPlus) 820 return true; 821 822 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 823 return true; 824 825 return (Previous.getResultKind() == LookupResult::Found 826 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 827} 828 829/// Add this decl to the scope shadowed decl chains. 830void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 831 // Move up the scope chain until we find the nearest enclosing 832 // non-transparent context. The declaration will be introduced into this 833 // scope. 834 while (S->getEntity() && 835 ((DeclContext *)S->getEntity())->isTransparentContext()) 836 S = S->getParent(); 837 838 // Add scoped declarations into their context, so that they can be 839 // found later. Declarations without a context won't be inserted 840 // into any context. 841 if (AddToContext) 842 CurContext->addDecl(D); 843 844 // Out-of-line definitions shouldn't be pushed into scope in C++. 845 // Out-of-line variable and function definitions shouldn't even in C. 846 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 847 D->isOutOfLine()) 848 return; 849 850 // Template instantiations should also not be pushed into scope. 851 if (isa<FunctionDecl>(D) && 852 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 853 return; 854 855 // If this replaces anything in the current scope, 856 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 857 IEnd = IdResolver.end(); 858 for (; I != IEnd; ++I) { 859 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 860 S->RemoveDecl(*I); 861 IdResolver.RemoveDecl(*I); 862 863 // Should only need to replace one decl. 864 break; 865 } 866 } 867 868 S->AddDecl(D); 869 870 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 871 // Implicitly-generated labels may end up getting generated in an order that 872 // isn't strictly lexical, which breaks name lookup. Be careful to insert 873 // the label at the appropriate place in the identifier chain. 874 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 875 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 876 if (IDC == CurContext) { 877 if (!S->isDeclScope(*I)) 878 continue; 879 } else if (IDC->Encloses(CurContext)) 880 break; 881 } 882 883 IdResolver.InsertDeclAfter(I, D); 884 } else { 885 IdResolver.AddDecl(D); 886 } 887} 888 889bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 890 bool ExplicitInstantiationOrSpecialization) { 891 return IdResolver.isDeclInScope(D, Ctx, Context, S, 892 ExplicitInstantiationOrSpecialization); 893} 894 895Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 896 DeclContext *TargetDC = DC->getPrimaryContext(); 897 do { 898 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 899 if (ScopeDC->getPrimaryContext() == TargetDC) 900 return S; 901 } while ((S = S->getParent())); 902 903 return 0; 904} 905 906static bool isOutOfScopePreviousDeclaration(NamedDecl *, 907 DeclContext*, 908 ASTContext&); 909 910/// Filters out lookup results that don't fall within the given scope 911/// as determined by isDeclInScope. 912void Sema::FilterLookupForScope(LookupResult &R, 913 DeclContext *Ctx, Scope *S, 914 bool ConsiderLinkage, 915 bool ExplicitInstantiationOrSpecialization) { 916 LookupResult::Filter F = R.makeFilter(); 917 while (F.hasNext()) { 918 NamedDecl *D = F.next(); 919 920 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 921 continue; 922 923 if (ConsiderLinkage && 924 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 925 continue; 926 927 F.erase(); 928 } 929 930 F.done(); 931} 932 933static bool isUsingDecl(NamedDecl *D) { 934 return isa<UsingShadowDecl>(D) || 935 isa<UnresolvedUsingTypenameDecl>(D) || 936 isa<UnresolvedUsingValueDecl>(D); 937} 938 939/// Removes using shadow declarations from the lookup results. 940static void RemoveUsingDecls(LookupResult &R) { 941 LookupResult::Filter F = R.makeFilter(); 942 while (F.hasNext()) 943 if (isUsingDecl(F.next())) 944 F.erase(); 945 946 F.done(); 947} 948 949/// \brief Check for this common pattern: 950/// @code 951/// class S { 952/// S(const S&); // DO NOT IMPLEMENT 953/// void operator=(const S&); // DO NOT IMPLEMENT 954/// }; 955/// @endcode 956static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 957 // FIXME: Should check for private access too but access is set after we get 958 // the decl here. 959 if (D->doesThisDeclarationHaveABody()) 960 return false; 961 962 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 963 return CD->isCopyConstructor(); 964 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 965 return Method->isCopyAssignmentOperator(); 966 return false; 967} 968 969bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 970 assert(D); 971 972 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 973 return false; 974 975 // Ignore class templates. 976 if (D->getDeclContext()->isDependentContext() || 977 D->getLexicalDeclContext()->isDependentContext()) 978 return false; 979 980 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 981 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 982 return false; 983 984 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 985 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 986 return false; 987 } else { 988 // 'static inline' functions are used in headers; don't warn. 989 if (FD->getStorageClass() == SC_Static && 990 FD->isInlineSpecified()) 991 return false; 992 } 993 994 if (FD->doesThisDeclarationHaveABody() && 995 Context.DeclMustBeEmitted(FD)) 996 return false; 997 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 998 if (!VD->isFileVarDecl() || 999 VD->getType().isConstant(Context) || 1000 Context.DeclMustBeEmitted(VD)) 1001 return false; 1002 1003 if (VD->isStaticDataMember() && 1004 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1005 return false; 1006 1007 } else { 1008 return false; 1009 } 1010 1011 // Only warn for unused decls internal to the translation unit. 1012 if (D->getLinkage() == ExternalLinkage) 1013 return false; 1014 1015 return true; 1016} 1017 1018void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1019 if (!D) 1020 return; 1021 1022 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1023 const FunctionDecl *First = FD->getFirstDeclaration(); 1024 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1029 const VarDecl *First = VD->getFirstDeclaration(); 1030 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1031 return; // First should already be in the vector. 1032 } 1033 1034 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1035 UnusedFileScopedDecls.push_back(D); 1036 } 1037 1038static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1039 if (D->isInvalidDecl()) 1040 return false; 1041 1042 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1043 return false; 1044 1045 if (isa<LabelDecl>(D)) 1046 return true; 1047 1048 // White-list anything that isn't a local variable. 1049 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1050 !D->getDeclContext()->isFunctionOrMethod()) 1051 return false; 1052 1053 // Types of valid local variables should be complete, so this should succeed. 1054 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1055 1056 // White-list anything with an __attribute__((unused)) type. 1057 QualType Ty = VD->getType(); 1058 1059 // Only look at the outermost level of typedef. 1060 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1061 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1062 return false; 1063 } 1064 1065 // If we failed to complete the type for some reason, or if the type is 1066 // dependent, don't diagnose the variable. 1067 if (Ty->isIncompleteType() || Ty->isDependentType()) 1068 return false; 1069 1070 if (const TagType *TT = Ty->getAs<TagType>()) { 1071 const TagDecl *Tag = TT->getDecl(); 1072 if (Tag->hasAttr<UnusedAttr>()) 1073 return false; 1074 1075 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1076 // FIXME: Checking for the presence of a user-declared constructor 1077 // isn't completely accurate; we'd prefer to check that the initializer 1078 // has no side effects. 1079 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1080 return false; 1081 } 1082 } 1083 1084 // TODO: __attribute__((unused)) templates? 1085 } 1086 1087 return true; 1088} 1089 1090static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1091 FixItHint &Hint) { 1092 if (isa<LabelDecl>(D)) { 1093 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1094 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1095 if (AfterColon.isInvalid()) 1096 return; 1097 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1098 getCharRange(D->getLocStart(), AfterColon)); 1099 } 1100 return; 1101} 1102 1103/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1104/// unless they are marked attr(unused). 1105void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1106 FixItHint Hint; 1107 if (!ShouldDiagnoseUnusedDecl(D)) 1108 return; 1109 1110 GenerateFixForUnusedDecl(D, Context, Hint); 1111 1112 unsigned DiagID; 1113 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1114 DiagID = diag::warn_unused_exception_param; 1115 else if (isa<LabelDecl>(D)) 1116 DiagID = diag::warn_unused_label; 1117 else 1118 DiagID = diag::warn_unused_variable; 1119 1120 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1121} 1122 1123static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1124 // Verify that we have no forward references left. If so, there was a goto 1125 // or address of a label taken, but no definition of it. Label fwd 1126 // definitions are indicated with a null substmt. 1127 if (L->getStmt() == 0) 1128 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1129} 1130 1131void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1132 if (S->decl_empty()) return; 1133 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1134 "Scope shouldn't contain decls!"); 1135 1136 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1137 I != E; ++I) { 1138 Decl *TmpD = (*I); 1139 assert(TmpD && "This decl didn't get pushed??"); 1140 1141 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1142 NamedDecl *D = cast<NamedDecl>(TmpD); 1143 1144 if (!D->getDeclName()) continue; 1145 1146 // Diagnose unused variables in this scope. 1147 if (!S->hasErrorOccurred()) 1148 DiagnoseUnusedDecl(D); 1149 1150 // If this was a forward reference to a label, verify it was defined. 1151 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1152 CheckPoppedLabel(LD, *this); 1153 1154 // Remove this name from our lexical scope. 1155 IdResolver.RemoveDecl(D); 1156 } 1157} 1158 1159/// \brief Look for an Objective-C class in the translation unit. 1160/// 1161/// \param Id The name of the Objective-C class we're looking for. If 1162/// typo-correction fixes this name, the Id will be updated 1163/// to the fixed name. 1164/// 1165/// \param IdLoc The location of the name in the translation unit. 1166/// 1167/// \param TypoCorrection If true, this routine will attempt typo correction 1168/// if there is no class with the given name. 1169/// 1170/// \returns The declaration of the named Objective-C class, or NULL if the 1171/// class could not be found. 1172ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1173 SourceLocation IdLoc, 1174 bool DoTypoCorrection) { 1175 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1176 // creation from this context. 1177 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1178 1179 if (!IDecl && DoTypoCorrection) { 1180 // Perform typo correction at the given location, but only if we 1181 // find an Objective-C class name. 1182 TypoCorrection C; 1183 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1184 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1185 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1186 Diag(IdLoc, diag::err_undef_interface_suggest) 1187 << Id << IDecl->getDeclName() 1188 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1189 Diag(IDecl->getLocation(), diag::note_previous_decl) 1190 << IDecl->getDeclName(); 1191 1192 Id = IDecl->getIdentifier(); 1193 } 1194 } 1195 1196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1197} 1198 1199/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1200/// from S, where a non-field would be declared. This routine copes 1201/// with the difference between C and C++ scoping rules in structs and 1202/// unions. For example, the following code is well-formed in C but 1203/// ill-formed in C++: 1204/// @code 1205/// struct S6 { 1206/// enum { BAR } e; 1207/// }; 1208/// 1209/// void test_S6() { 1210/// struct S6 a; 1211/// a.e = BAR; 1212/// } 1213/// @endcode 1214/// For the declaration of BAR, this routine will return a different 1215/// scope. The scope S will be the scope of the unnamed enumeration 1216/// within S6. In C++, this routine will return the scope associated 1217/// with S6, because the enumeration's scope is a transparent 1218/// context but structures can contain non-field names. In C, this 1219/// routine will return the translation unit scope, since the 1220/// enumeration's scope is a transparent context and structures cannot 1221/// contain non-field names. 1222Scope *Sema::getNonFieldDeclScope(Scope *S) { 1223 while (((S->getFlags() & Scope::DeclScope) == 0) || 1224 (S->getEntity() && 1225 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1226 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1227 S = S->getParent(); 1228 return S; 1229} 1230 1231/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1232/// file scope. lazily create a decl for it. ForRedeclaration is true 1233/// if we're creating this built-in in anticipation of redeclaring the 1234/// built-in. 1235NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1236 Scope *S, bool ForRedeclaration, 1237 SourceLocation Loc) { 1238 Builtin::ID BID = (Builtin::ID)bid; 1239 1240 ASTContext::GetBuiltinTypeError Error; 1241 QualType R = Context.GetBuiltinType(BID, Error); 1242 switch (Error) { 1243 case ASTContext::GE_None: 1244 // Okay 1245 break; 1246 1247 case ASTContext::GE_Missing_stdio: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 1253 case ASTContext::GE_Missing_setjmp: 1254 if (ForRedeclaration) 1255 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1256 << Context.BuiltinInfo.GetName(BID); 1257 return 0; 1258 } 1259 1260 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1261 Diag(Loc, diag::ext_implicit_lib_function_decl) 1262 << Context.BuiltinInfo.GetName(BID) 1263 << R; 1264 if (Context.BuiltinInfo.getHeaderName(BID) && 1265 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1266 != Diagnostic::Ignored) 1267 Diag(Loc, diag::note_please_include_header) 1268 << Context.BuiltinInfo.getHeaderName(BID) 1269 << Context.BuiltinInfo.GetName(BID); 1270 } 1271 1272 FunctionDecl *New = FunctionDecl::Create(Context, 1273 Context.getTranslationUnitDecl(), 1274 Loc, Loc, II, R, /*TInfo=*/0, 1275 SC_Extern, 1276 SC_None, false, 1277 /*hasPrototype=*/true); 1278 New->setImplicit(); 1279 1280 // Create Decl objects for each parameter, adding them to the 1281 // FunctionDecl. 1282 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1283 SmallVector<ParmVarDecl*, 16> Params; 1284 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1285 ParmVarDecl *parm = 1286 ParmVarDecl::Create(Context, New, SourceLocation(), 1287 SourceLocation(), 0, 1288 FT->getArgType(i), /*TInfo=*/0, 1289 SC_None, SC_None, 0); 1290 parm->setScopeInfo(0, i); 1291 Params.push_back(parm); 1292 } 1293 New->setParams(Params.data(), Params.size()); 1294 } 1295 1296 AddKnownFunctionAttributes(New); 1297 1298 // TUScope is the translation-unit scope to insert this function into. 1299 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1300 // relate Scopes to DeclContexts, and probably eliminate CurContext 1301 // entirely, but we're not there yet. 1302 DeclContext *SavedContext = CurContext; 1303 CurContext = Context.getTranslationUnitDecl(); 1304 PushOnScopeChains(New, TUScope); 1305 CurContext = SavedContext; 1306 return New; 1307} 1308 1309/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1310/// same name and scope as a previous declaration 'Old'. Figure out 1311/// how to resolve this situation, merging decls or emitting 1312/// diagnostics as appropriate. If there was an error, set New to be invalid. 1313/// 1314void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1315 // If the new decl is known invalid already, don't bother doing any 1316 // merging checks. 1317 if (New->isInvalidDecl()) return; 1318 1319 // Allow multiple definitions for ObjC built-in typedefs. 1320 // FIXME: Verify the underlying types are equivalent! 1321 if (getLangOptions().ObjC1) { 1322 const IdentifierInfo *TypeID = New->getIdentifier(); 1323 switch (TypeID->getLength()) { 1324 default: break; 1325 case 2: 1326 if (!TypeID->isStr("id")) 1327 break; 1328 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1329 // Install the built-in type for 'id', ignoring the current definition. 1330 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1331 return; 1332 case 5: 1333 if (!TypeID->isStr("Class")) 1334 break; 1335 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1336 // Install the built-in type for 'Class', ignoring the current definition. 1337 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1338 return; 1339 case 3: 1340 if (!TypeID->isStr("SEL")) 1341 break; 1342 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1343 // Install the built-in type for 'SEL', ignoring the current definition. 1344 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1345 return; 1346 } 1347 // Fall through - the typedef name was not a builtin type. 1348 } 1349 1350 // Verify the old decl was also a type. 1351 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1352 if (!Old) { 1353 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1354 << New->getDeclName(); 1355 1356 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1357 if (OldD->getLocation().isValid()) 1358 Diag(OldD->getLocation(), diag::note_previous_definition); 1359 1360 return New->setInvalidDecl(); 1361 } 1362 1363 // If the old declaration is invalid, just give up here. 1364 if (Old->isInvalidDecl()) 1365 return New->setInvalidDecl(); 1366 1367 // Determine the "old" type we'll use for checking and diagnostics. 1368 QualType OldType; 1369 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1370 OldType = OldTypedef->getUnderlyingType(); 1371 else 1372 OldType = Context.getTypeDeclType(Old); 1373 1374 // If the typedef types are not identical, reject them in all languages and 1375 // with any extensions enabled. 1376 1377 if (OldType != New->getUnderlyingType() && 1378 Context.getCanonicalType(OldType) != 1379 Context.getCanonicalType(New->getUnderlyingType())) { 1380 int Kind = 0; 1381 if (isa<TypeAliasDecl>(Old)) 1382 Kind = 1; 1383 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1384 << Kind << New->getUnderlyingType() << OldType; 1385 if (Old->getLocation().isValid()) 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 return New->setInvalidDecl(); 1388 } 1389 1390 // The types match. Link up the redeclaration chain if the old 1391 // declaration was a typedef. 1392 // FIXME: this is a potential source of weirdness if the type 1393 // spellings don't match exactly. 1394 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1395 New->setPreviousDeclaration(Typedef); 1396 1397 if (getLangOptions().Microsoft) 1398 return; 1399 1400 if (getLangOptions().CPlusPlus) { 1401 // C++ [dcl.typedef]p2: 1402 // In a given non-class scope, a typedef specifier can be used to 1403 // redefine the name of any type declared in that scope to refer 1404 // to the type to which it already refers. 1405 if (!isa<CXXRecordDecl>(CurContext)) 1406 return; 1407 1408 // C++0x [dcl.typedef]p4: 1409 // In a given class scope, a typedef specifier can be used to redefine 1410 // any class-name declared in that scope that is not also a typedef-name 1411 // to refer to the type to which it already refers. 1412 // 1413 // This wording came in via DR424, which was a correction to the 1414 // wording in DR56, which accidentally banned code like: 1415 // 1416 // struct S { 1417 // typedef struct A { } A; 1418 // }; 1419 // 1420 // in the C++03 standard. We implement the C++0x semantics, which 1421 // allow the above but disallow 1422 // 1423 // struct S { 1424 // typedef int I; 1425 // typedef int I; 1426 // }; 1427 // 1428 // since that was the intent of DR56. 1429 if (!isa<TypedefNameDecl>(Old)) 1430 return; 1431 1432 Diag(New->getLocation(), diag::err_redefinition) 1433 << New->getDeclName(); 1434 Diag(Old->getLocation(), diag::note_previous_definition); 1435 return New->setInvalidDecl(); 1436 } 1437 1438 // If we have a redefinition of a typedef in C, emit a warning. This warning 1439 // is normally mapped to an error, but can be controlled with 1440 // -Wtypedef-redefinition. If either the original or the redefinition is 1441 // in a system header, don't emit this for compatibility with GCC. 1442 if (getDiagnostics().getSuppressSystemWarnings() && 1443 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1444 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1445 return; 1446 1447 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1448 << New->getDeclName(); 1449 Diag(Old->getLocation(), diag::note_previous_definition); 1450 return; 1451} 1452 1453/// DeclhasAttr - returns true if decl Declaration already has the target 1454/// attribute. 1455static bool 1456DeclHasAttr(const Decl *D, const Attr *A) { 1457 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1458 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1459 if ((*i)->getKind() == A->getKind()) { 1460 // FIXME: Don't hardcode this check 1461 if (OA && isa<OwnershipAttr>(*i)) 1462 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1463 return true; 1464 } 1465 1466 return false; 1467} 1468 1469/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1470static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1471 ASTContext &C, bool mergeDeprecation = true) { 1472 if (!oldDecl->hasAttrs()) 1473 return; 1474 1475 bool foundAny = newDecl->hasAttrs(); 1476 1477 // Ensure that any moving of objects within the allocated map is done before 1478 // we process them. 1479 if (!foundAny) newDecl->setAttrs(AttrVec()); 1480 1481 for (specific_attr_iterator<InheritableAttr> 1482 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1483 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1484 // Ignore deprecated and unavailable attributes if requested. 1485 if (!mergeDeprecation && 1486 (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i))) 1487 continue; 1488 1489 if (!DeclHasAttr(newDecl, *i)) { 1490 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1491 newAttr->setInherited(true); 1492 newDecl->addAttr(newAttr); 1493 foundAny = true; 1494 } 1495 } 1496 1497 if (!foundAny) newDecl->dropAttrs(); 1498} 1499 1500/// mergeParamDeclAttributes - Copy attributes from the old parameter 1501/// to the new one. 1502static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1503 const ParmVarDecl *oldDecl, 1504 ASTContext &C) { 1505 if (!oldDecl->hasAttrs()) 1506 return; 1507 1508 bool foundAny = newDecl->hasAttrs(); 1509 1510 // Ensure that any moving of objects within the allocated map is 1511 // done before we process them. 1512 if (!foundAny) newDecl->setAttrs(AttrVec()); 1513 1514 for (specific_attr_iterator<InheritableParamAttr> 1515 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1516 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1517 if (!DeclHasAttr(newDecl, *i)) { 1518 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1519 newAttr->setInherited(true); 1520 newDecl->addAttr(newAttr); 1521 foundAny = true; 1522 } 1523 } 1524 1525 if (!foundAny) newDecl->dropAttrs(); 1526} 1527 1528namespace { 1529 1530/// Used in MergeFunctionDecl to keep track of function parameters in 1531/// C. 1532struct GNUCompatibleParamWarning { 1533 ParmVarDecl *OldParm; 1534 ParmVarDecl *NewParm; 1535 QualType PromotedType; 1536}; 1537 1538} 1539 1540/// getSpecialMember - get the special member enum for a method. 1541Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1542 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1543 if (Ctor->isDefaultConstructor()) 1544 return Sema::CXXDefaultConstructor; 1545 1546 if (Ctor->isCopyConstructor()) 1547 return Sema::CXXCopyConstructor; 1548 1549 if (Ctor->isMoveConstructor()) 1550 return Sema::CXXMoveConstructor; 1551 } else if (isa<CXXDestructorDecl>(MD)) { 1552 return Sema::CXXDestructor; 1553 } else if (MD->isCopyAssignmentOperator()) { 1554 return Sema::CXXCopyAssignment; 1555 } else if (MD->isMoveAssignmentOperator()) { 1556 return Sema::CXXMoveAssignment; 1557 } 1558 1559 return Sema::CXXInvalid; 1560} 1561 1562/// canRedefineFunction - checks if a function can be redefined. Currently, 1563/// only extern inline functions can be redefined, and even then only in 1564/// GNU89 mode. 1565static bool canRedefineFunction(const FunctionDecl *FD, 1566 const LangOptions& LangOpts) { 1567 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1568 !LangOpts.CPlusPlus && 1569 FD->isInlineSpecified() && 1570 FD->getStorageClass() == SC_Extern); 1571} 1572 1573/// MergeFunctionDecl - We just parsed a function 'New' from 1574/// declarator D which has the same name and scope as a previous 1575/// declaration 'Old'. Figure out how to resolve this situation, 1576/// merging decls or emitting diagnostics as appropriate. 1577/// 1578/// In C++, New and Old must be declarations that are not 1579/// overloaded. Use IsOverload to determine whether New and Old are 1580/// overloaded, and to select the Old declaration that New should be 1581/// merged with. 1582/// 1583/// Returns true if there was an error, false otherwise. 1584bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1585 // Verify the old decl was also a function. 1586 FunctionDecl *Old = 0; 1587 if (FunctionTemplateDecl *OldFunctionTemplate 1588 = dyn_cast<FunctionTemplateDecl>(OldD)) 1589 Old = OldFunctionTemplate->getTemplatedDecl(); 1590 else 1591 Old = dyn_cast<FunctionDecl>(OldD); 1592 if (!Old) { 1593 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1594 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1595 Diag(Shadow->getTargetDecl()->getLocation(), 1596 diag::note_using_decl_target); 1597 Diag(Shadow->getUsingDecl()->getLocation(), 1598 diag::note_using_decl) << 0; 1599 return true; 1600 } 1601 1602 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1603 << New->getDeclName(); 1604 Diag(OldD->getLocation(), diag::note_previous_definition); 1605 return true; 1606 } 1607 1608 // Determine whether the previous declaration was a definition, 1609 // implicit declaration, or a declaration. 1610 diag::kind PrevDiag; 1611 if (Old->isThisDeclarationADefinition()) 1612 PrevDiag = diag::note_previous_definition; 1613 else if (Old->isImplicit()) 1614 PrevDiag = diag::note_previous_implicit_declaration; 1615 else 1616 PrevDiag = diag::note_previous_declaration; 1617 1618 QualType OldQType = Context.getCanonicalType(Old->getType()); 1619 QualType NewQType = Context.getCanonicalType(New->getType()); 1620 1621 // Don't complain about this if we're in GNU89 mode and the old function 1622 // is an extern inline function. 1623 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1624 New->getStorageClass() == SC_Static && 1625 Old->getStorageClass() != SC_Static && 1626 !canRedefineFunction(Old, getLangOptions())) { 1627 if (getLangOptions().Microsoft) { 1628 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1629 Diag(Old->getLocation(), PrevDiag); 1630 } else { 1631 Diag(New->getLocation(), diag::err_static_non_static) << New; 1632 Diag(Old->getLocation(), PrevDiag); 1633 return true; 1634 } 1635 } 1636 1637 // If a function is first declared with a calling convention, but is 1638 // later declared or defined without one, the second decl assumes the 1639 // calling convention of the first. 1640 // 1641 // For the new decl, we have to look at the NON-canonical type to tell the 1642 // difference between a function that really doesn't have a calling 1643 // convention and one that is declared cdecl. That's because in 1644 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1645 // because it is the default calling convention. 1646 // 1647 // Note also that we DO NOT return at this point, because we still have 1648 // other tests to run. 1649 const FunctionType *OldType = cast<FunctionType>(OldQType); 1650 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1651 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1652 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1653 bool RequiresAdjustment = false; 1654 if (OldTypeInfo.getCC() != CC_Default && 1655 NewTypeInfo.getCC() == CC_Default) { 1656 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1657 RequiresAdjustment = true; 1658 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1659 NewTypeInfo.getCC())) { 1660 // Calling conventions really aren't compatible, so complain. 1661 Diag(New->getLocation(), diag::err_cconv_change) 1662 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1663 << (OldTypeInfo.getCC() == CC_Default) 1664 << (OldTypeInfo.getCC() == CC_Default ? "" : 1665 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1666 Diag(Old->getLocation(), diag::note_previous_declaration); 1667 return true; 1668 } 1669 1670 // FIXME: diagnose the other way around? 1671 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1672 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1673 RequiresAdjustment = true; 1674 } 1675 1676 // Merge regparm attribute. 1677 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1678 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1679 if (NewTypeInfo.getHasRegParm()) { 1680 Diag(New->getLocation(), diag::err_regparm_mismatch) 1681 << NewType->getRegParmType() 1682 << OldType->getRegParmType(); 1683 Diag(Old->getLocation(), diag::note_previous_declaration); 1684 return true; 1685 } 1686 1687 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1688 RequiresAdjustment = true; 1689 } 1690 1691 if (RequiresAdjustment) { 1692 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1693 New->setType(QualType(NewType, 0)); 1694 NewQType = Context.getCanonicalType(New->getType()); 1695 } 1696 1697 if (getLangOptions().CPlusPlus) { 1698 // (C++98 13.1p2): 1699 // Certain function declarations cannot be overloaded: 1700 // -- Function declarations that differ only in the return type 1701 // cannot be overloaded. 1702 QualType OldReturnType = OldType->getResultType(); 1703 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1704 QualType ResQT; 1705 if (OldReturnType != NewReturnType) { 1706 if (NewReturnType->isObjCObjectPointerType() 1707 && OldReturnType->isObjCObjectPointerType()) 1708 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1709 if (ResQT.isNull()) { 1710 if (New->isCXXClassMember() && New->isOutOfLine()) 1711 Diag(New->getLocation(), 1712 diag::err_member_def_does_not_match_ret_type) << New; 1713 else 1714 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1715 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1716 return true; 1717 } 1718 else 1719 NewQType = ResQT; 1720 } 1721 1722 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1723 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1724 if (OldMethod && NewMethod) { 1725 // Preserve triviality. 1726 NewMethod->setTrivial(OldMethod->isTrivial()); 1727 1728 // MSVC allows explicit template specialization at class scope: 1729 // 2 CXMethodDecls referring to the same function will be injected. 1730 // We don't want a redeclartion error. 1731 bool IsClassScopeExplicitSpecialization = 1732 OldMethod->isFunctionTemplateSpecialization() && 1733 NewMethod->isFunctionTemplateSpecialization(); 1734 bool isFriend = NewMethod->getFriendObjectKind(); 1735 1736 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1737 !IsClassScopeExplicitSpecialization) { 1738 // -- Member function declarations with the same name and the 1739 // same parameter types cannot be overloaded if any of them 1740 // is a static member function declaration. 1741 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1742 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1743 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1744 return true; 1745 } 1746 1747 // C++ [class.mem]p1: 1748 // [...] A member shall not be declared twice in the 1749 // member-specification, except that a nested class or member 1750 // class template can be declared and then later defined. 1751 unsigned NewDiag; 1752 if (isa<CXXConstructorDecl>(OldMethod)) 1753 NewDiag = diag::err_constructor_redeclared; 1754 else if (isa<CXXDestructorDecl>(NewMethod)) 1755 NewDiag = diag::err_destructor_redeclared; 1756 else if (isa<CXXConversionDecl>(NewMethod)) 1757 NewDiag = diag::err_conv_function_redeclared; 1758 else 1759 NewDiag = diag::err_member_redeclared; 1760 1761 Diag(New->getLocation(), NewDiag); 1762 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1763 1764 // Complain if this is an explicit declaration of a special 1765 // member that was initially declared implicitly. 1766 // 1767 // As an exception, it's okay to befriend such methods in order 1768 // to permit the implicit constructor/destructor/operator calls. 1769 } else if (OldMethod->isImplicit()) { 1770 if (isFriend) { 1771 NewMethod->setImplicit(); 1772 } else { 1773 Diag(NewMethod->getLocation(), 1774 diag::err_definition_of_implicitly_declared_member) 1775 << New << getSpecialMember(OldMethod); 1776 return true; 1777 } 1778 } else if (OldMethod->isExplicitlyDefaulted()) { 1779 Diag(NewMethod->getLocation(), 1780 diag::err_definition_of_explicitly_defaulted_member) 1781 << getSpecialMember(OldMethod); 1782 return true; 1783 } 1784 } 1785 1786 // (C++98 8.3.5p3): 1787 // All declarations for a function shall agree exactly in both the 1788 // return type and the parameter-type-list. 1789 // We also want to respect all the extended bits except noreturn. 1790 1791 // noreturn should now match unless the old type info didn't have it. 1792 QualType OldQTypeForComparison = OldQType; 1793 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1794 assert(OldQType == QualType(OldType, 0)); 1795 const FunctionType *OldTypeForComparison 1796 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1797 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1798 assert(OldQTypeForComparison.isCanonical()); 1799 } 1800 1801 if (OldQTypeForComparison == NewQType) 1802 return MergeCompatibleFunctionDecls(New, Old); 1803 1804 // Fall through for conflicting redeclarations and redefinitions. 1805 } 1806 1807 // C: Function types need to be compatible, not identical. This handles 1808 // duplicate function decls like "void f(int); void f(enum X);" properly. 1809 if (!getLangOptions().CPlusPlus && 1810 Context.typesAreCompatible(OldQType, NewQType)) { 1811 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1812 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1813 const FunctionProtoType *OldProto = 0; 1814 if (isa<FunctionNoProtoType>(NewFuncType) && 1815 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1816 // The old declaration provided a function prototype, but the 1817 // new declaration does not. Merge in the prototype. 1818 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1819 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1820 OldProto->arg_type_end()); 1821 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1822 ParamTypes.data(), ParamTypes.size(), 1823 OldProto->getExtProtoInfo()); 1824 New->setType(NewQType); 1825 New->setHasInheritedPrototype(); 1826 1827 // Synthesize a parameter for each argument type. 1828 SmallVector<ParmVarDecl*, 16> Params; 1829 for (FunctionProtoType::arg_type_iterator 1830 ParamType = OldProto->arg_type_begin(), 1831 ParamEnd = OldProto->arg_type_end(); 1832 ParamType != ParamEnd; ++ParamType) { 1833 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1834 SourceLocation(), 1835 SourceLocation(), 0, 1836 *ParamType, /*TInfo=*/0, 1837 SC_None, SC_None, 1838 0); 1839 Param->setScopeInfo(0, Params.size()); 1840 Param->setImplicit(); 1841 Params.push_back(Param); 1842 } 1843 1844 New->setParams(Params.data(), Params.size()); 1845 } 1846 1847 return MergeCompatibleFunctionDecls(New, Old); 1848 } 1849 1850 // GNU C permits a K&R definition to follow a prototype declaration 1851 // if the declared types of the parameters in the K&R definition 1852 // match the types in the prototype declaration, even when the 1853 // promoted types of the parameters from the K&R definition differ 1854 // from the types in the prototype. GCC then keeps the types from 1855 // the prototype. 1856 // 1857 // If a variadic prototype is followed by a non-variadic K&R definition, 1858 // the K&R definition becomes variadic. This is sort of an edge case, but 1859 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1860 // C99 6.9.1p8. 1861 if (!getLangOptions().CPlusPlus && 1862 Old->hasPrototype() && !New->hasPrototype() && 1863 New->getType()->getAs<FunctionProtoType>() && 1864 Old->getNumParams() == New->getNumParams()) { 1865 SmallVector<QualType, 16> ArgTypes; 1866 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1867 const FunctionProtoType *OldProto 1868 = Old->getType()->getAs<FunctionProtoType>(); 1869 const FunctionProtoType *NewProto 1870 = New->getType()->getAs<FunctionProtoType>(); 1871 1872 // Determine whether this is the GNU C extension. 1873 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1874 NewProto->getResultType()); 1875 bool LooseCompatible = !MergedReturn.isNull(); 1876 for (unsigned Idx = 0, End = Old->getNumParams(); 1877 LooseCompatible && Idx != End; ++Idx) { 1878 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1879 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1880 if (Context.typesAreCompatible(OldParm->getType(), 1881 NewProto->getArgType(Idx))) { 1882 ArgTypes.push_back(NewParm->getType()); 1883 } else if (Context.typesAreCompatible(OldParm->getType(), 1884 NewParm->getType(), 1885 /*CompareUnqualified=*/true)) { 1886 GNUCompatibleParamWarning Warn 1887 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1888 Warnings.push_back(Warn); 1889 ArgTypes.push_back(NewParm->getType()); 1890 } else 1891 LooseCompatible = false; 1892 } 1893 1894 if (LooseCompatible) { 1895 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1896 Diag(Warnings[Warn].NewParm->getLocation(), 1897 diag::ext_param_promoted_not_compatible_with_prototype) 1898 << Warnings[Warn].PromotedType 1899 << Warnings[Warn].OldParm->getType(); 1900 if (Warnings[Warn].OldParm->getLocation().isValid()) 1901 Diag(Warnings[Warn].OldParm->getLocation(), 1902 diag::note_previous_declaration); 1903 } 1904 1905 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1906 ArgTypes.size(), 1907 OldProto->getExtProtoInfo())); 1908 return MergeCompatibleFunctionDecls(New, Old); 1909 } 1910 1911 // Fall through to diagnose conflicting types. 1912 } 1913 1914 // A function that has already been declared has been redeclared or defined 1915 // with a different type- show appropriate diagnostic 1916 if (unsigned BuiltinID = Old->getBuiltinID()) { 1917 // The user has declared a builtin function with an incompatible 1918 // signature. 1919 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1920 // The function the user is redeclaring is a library-defined 1921 // function like 'malloc' or 'printf'. Warn about the 1922 // redeclaration, then pretend that we don't know about this 1923 // library built-in. 1924 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1925 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1926 << Old << Old->getType(); 1927 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1928 Old->setInvalidDecl(); 1929 return false; 1930 } 1931 1932 PrevDiag = diag::note_previous_builtin_declaration; 1933 } 1934 1935 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1936 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1937 return true; 1938} 1939 1940/// \brief Completes the merge of two function declarations that are 1941/// known to be compatible. 1942/// 1943/// This routine handles the merging of attributes and other 1944/// properties of function declarations form the old declaration to 1945/// the new declaration, once we know that New is in fact a 1946/// redeclaration of Old. 1947/// 1948/// \returns false 1949bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1950 // Merge the attributes 1951 mergeDeclAttributes(New, Old, Context); 1952 1953 // Merge the storage class. 1954 if (Old->getStorageClass() != SC_Extern && 1955 Old->getStorageClass() != SC_None) 1956 New->setStorageClass(Old->getStorageClass()); 1957 1958 // Merge "pure" flag. 1959 if (Old->isPure()) 1960 New->setPure(); 1961 1962 // Merge attributes from the parameters. These can mismatch with K&R 1963 // declarations. 1964 if (New->getNumParams() == Old->getNumParams()) 1965 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1966 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1967 Context); 1968 1969 if (getLangOptions().CPlusPlus) 1970 return MergeCXXFunctionDecl(New, Old); 1971 1972 return false; 1973} 1974 1975 1976void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1977 const ObjCMethodDecl *oldMethod) { 1978 // We don't want to merge unavailable and deprecated attributes 1979 // except from interface to implementation. 1980 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 1981 1982 // Merge the attributes. 1983 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 1984 1985 // Merge attributes from the parameters. 1986 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1987 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1988 ni != ne; ++ni, ++oi) 1989 mergeParamDeclAttributes(*ni, *oi, Context); 1990 1991 CheckObjCMethodOverride(newMethod, oldMethod, true); 1992} 1993 1994/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1995/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1996/// emitting diagnostics as appropriate. 1997/// 1998/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1999/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2000/// check them before the initializer is attached. 2001/// 2002void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2003 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2004 return; 2005 2006 QualType MergedT; 2007 if (getLangOptions().CPlusPlus) { 2008 AutoType *AT = New->getType()->getContainedAutoType(); 2009 if (AT && !AT->isDeduced()) { 2010 // We don't know what the new type is until the initializer is attached. 2011 return; 2012 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2013 // These could still be something that needs exception specs checked. 2014 return MergeVarDeclExceptionSpecs(New, Old); 2015 } 2016 // C++ [basic.link]p10: 2017 // [...] the types specified by all declarations referring to a given 2018 // object or function shall be identical, except that declarations for an 2019 // array object can specify array types that differ by the presence or 2020 // absence of a major array bound (8.3.4). 2021 else if (Old->getType()->isIncompleteArrayType() && 2022 New->getType()->isArrayType()) { 2023 CanQual<ArrayType> OldArray 2024 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2025 CanQual<ArrayType> NewArray 2026 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2027 if (OldArray->getElementType() == NewArray->getElementType()) 2028 MergedT = New->getType(); 2029 } else if (Old->getType()->isArrayType() && 2030 New->getType()->isIncompleteArrayType()) { 2031 CanQual<ArrayType> OldArray 2032 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2033 CanQual<ArrayType> NewArray 2034 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2035 if (OldArray->getElementType() == NewArray->getElementType()) 2036 MergedT = Old->getType(); 2037 } else if (New->getType()->isObjCObjectPointerType() 2038 && Old->getType()->isObjCObjectPointerType()) { 2039 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2040 Old->getType()); 2041 } 2042 } else { 2043 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2044 } 2045 if (MergedT.isNull()) { 2046 Diag(New->getLocation(), diag::err_redefinition_different_type) 2047 << New->getDeclName(); 2048 Diag(Old->getLocation(), diag::note_previous_definition); 2049 return New->setInvalidDecl(); 2050 } 2051 New->setType(MergedT); 2052} 2053 2054/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2055/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2056/// situation, merging decls or emitting diagnostics as appropriate. 2057/// 2058/// Tentative definition rules (C99 6.9.2p2) are checked by 2059/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2060/// definitions here, since the initializer hasn't been attached. 2061/// 2062void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2063 // If the new decl is already invalid, don't do any other checking. 2064 if (New->isInvalidDecl()) 2065 return; 2066 2067 // Verify the old decl was also a variable. 2068 VarDecl *Old = 0; 2069 if (!Previous.isSingleResult() || 2070 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2071 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2072 << New->getDeclName(); 2073 Diag(Previous.getRepresentativeDecl()->getLocation(), 2074 diag::note_previous_definition); 2075 return New->setInvalidDecl(); 2076 } 2077 2078 // C++ [class.mem]p1: 2079 // A member shall not be declared twice in the member-specification [...] 2080 // 2081 // Here, we need only consider static data members. 2082 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2083 Diag(New->getLocation(), diag::err_duplicate_member) 2084 << New->getIdentifier(); 2085 Diag(Old->getLocation(), diag::note_previous_declaration); 2086 New->setInvalidDecl(); 2087 } 2088 2089 mergeDeclAttributes(New, Old, Context); 2090 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2091 if (New->getAttr<WeakImportAttr>() && 2092 Old->getStorageClass() == SC_None && 2093 !Old->getAttr<WeakImportAttr>()) { 2094 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2095 Diag(Old->getLocation(), diag::note_previous_definition); 2096 // Remove weak_import attribute on new declaration. 2097 New->dropAttr<WeakImportAttr>(); 2098 } 2099 2100 // Merge the types. 2101 MergeVarDeclTypes(New, Old); 2102 if (New->isInvalidDecl()) 2103 return; 2104 2105 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2106 if (New->getStorageClass() == SC_Static && 2107 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2108 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2109 Diag(Old->getLocation(), diag::note_previous_definition); 2110 return New->setInvalidDecl(); 2111 } 2112 // C99 6.2.2p4: 2113 // For an identifier declared with the storage-class specifier 2114 // extern in a scope in which a prior declaration of that 2115 // identifier is visible,23) if the prior declaration specifies 2116 // internal or external linkage, the linkage of the identifier at 2117 // the later declaration is the same as the linkage specified at 2118 // the prior declaration. If no prior declaration is visible, or 2119 // if the prior declaration specifies no linkage, then the 2120 // identifier has external linkage. 2121 if (New->hasExternalStorage() && Old->hasLinkage()) 2122 /* Okay */; 2123 else if (New->getStorageClass() != SC_Static && 2124 Old->getStorageClass() == SC_Static) { 2125 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2126 Diag(Old->getLocation(), diag::note_previous_definition); 2127 return New->setInvalidDecl(); 2128 } 2129 2130 // Check if extern is followed by non-extern and vice-versa. 2131 if (New->hasExternalStorage() && 2132 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2133 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2134 Diag(Old->getLocation(), diag::note_previous_definition); 2135 return New->setInvalidDecl(); 2136 } 2137 if (Old->hasExternalStorage() && 2138 !New->hasLinkage() && New->isLocalVarDecl()) { 2139 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2140 Diag(Old->getLocation(), diag::note_previous_definition); 2141 return New->setInvalidDecl(); 2142 } 2143 2144 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2145 2146 // FIXME: The test for external storage here seems wrong? We still 2147 // need to check for mismatches. 2148 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2149 // Don't complain about out-of-line definitions of static members. 2150 !(Old->getLexicalDeclContext()->isRecord() && 2151 !New->getLexicalDeclContext()->isRecord())) { 2152 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2153 Diag(Old->getLocation(), diag::note_previous_definition); 2154 return New->setInvalidDecl(); 2155 } 2156 2157 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2158 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2159 Diag(Old->getLocation(), diag::note_previous_definition); 2160 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2161 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2162 Diag(Old->getLocation(), diag::note_previous_definition); 2163 } 2164 2165 // C++ doesn't have tentative definitions, so go right ahead and check here. 2166 const VarDecl *Def; 2167 if (getLangOptions().CPlusPlus && 2168 New->isThisDeclarationADefinition() == VarDecl::Definition && 2169 (Def = Old->getDefinition())) { 2170 Diag(New->getLocation(), diag::err_redefinition) 2171 << New->getDeclName(); 2172 Diag(Def->getLocation(), diag::note_previous_definition); 2173 New->setInvalidDecl(); 2174 return; 2175 } 2176 // c99 6.2.2 P4. 2177 // For an identifier declared with the storage-class specifier extern in a 2178 // scope in which a prior declaration of that identifier is visible, if 2179 // the prior declaration specifies internal or external linkage, the linkage 2180 // of the identifier at the later declaration is the same as the linkage 2181 // specified at the prior declaration. 2182 // FIXME. revisit this code. 2183 if (New->hasExternalStorage() && 2184 Old->getLinkage() == InternalLinkage && 2185 New->getDeclContext() == Old->getDeclContext()) 2186 New->setStorageClass(Old->getStorageClass()); 2187 2188 // Keep a chain of previous declarations. 2189 New->setPreviousDeclaration(Old); 2190 2191 // Inherit access appropriately. 2192 New->setAccess(Old->getAccess()); 2193} 2194 2195/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2196/// no declarator (e.g. "struct foo;") is parsed. 2197Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2198 DeclSpec &DS) { 2199 return ParsedFreeStandingDeclSpec(S, AS, DS, 2200 MultiTemplateParamsArg(*this, 0, 0)); 2201} 2202 2203/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2204/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2205/// parameters to cope with template friend declarations. 2206Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2207 DeclSpec &DS, 2208 MultiTemplateParamsArg TemplateParams) { 2209 Decl *TagD = 0; 2210 TagDecl *Tag = 0; 2211 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2212 DS.getTypeSpecType() == DeclSpec::TST_struct || 2213 DS.getTypeSpecType() == DeclSpec::TST_union || 2214 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2215 TagD = DS.getRepAsDecl(); 2216 2217 if (!TagD) // We probably had an error 2218 return 0; 2219 2220 // Note that the above type specs guarantee that the 2221 // type rep is a Decl, whereas in many of the others 2222 // it's a Type. 2223 Tag = dyn_cast<TagDecl>(TagD); 2224 } 2225 2226 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2227 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2228 // or incomplete types shall not be restrict-qualified." 2229 if (TypeQuals & DeclSpec::TQ_restrict) 2230 Diag(DS.getRestrictSpecLoc(), 2231 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2232 << DS.getSourceRange(); 2233 } 2234 2235 if (DS.isConstexprSpecified()) { 2236 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2237 // and definitions of functions and variables. 2238 if (Tag) 2239 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2240 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2241 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2242 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2243 else 2244 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2245 // Don't emit warnings after this error. 2246 return TagD; 2247 } 2248 2249 if (DS.isFriendSpecified()) { 2250 // If we're dealing with a decl but not a TagDecl, assume that 2251 // whatever routines created it handled the friendship aspect. 2252 if (TagD && !Tag) 2253 return 0; 2254 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2255 } 2256 2257 // Track whether we warned about the fact that there aren't any 2258 // declarators. 2259 bool emittedWarning = false; 2260 2261 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2262 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2263 2264 if (!Record->getDeclName() && Record->isDefinition() && 2265 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2266 if (getLangOptions().CPlusPlus || 2267 Record->getDeclContext()->isRecord()) 2268 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2269 2270 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2271 << DS.getSourceRange(); 2272 emittedWarning = true; 2273 } 2274 } 2275 2276 // Check for Microsoft C extension: anonymous struct. 2277 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2278 CurContext->isRecord() && 2279 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2280 // Handle 2 kinds of anonymous struct: 2281 // struct STRUCT; 2282 // and 2283 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2284 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2285 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2286 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2287 DS.getRepAsType().get()->isStructureType())) { 2288 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2289 << DS.getSourceRange(); 2290 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2291 } 2292 } 2293 2294 if (getLangOptions().CPlusPlus && 2295 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2296 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2297 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2298 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2299 Diag(Enum->getLocation(), diag::ext_no_declarators) 2300 << DS.getSourceRange(); 2301 emittedWarning = true; 2302 } 2303 2304 // Skip all the checks below if we have a type error. 2305 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2306 2307 if (!DS.isMissingDeclaratorOk()) { 2308 // Warn about typedefs of enums without names, since this is an 2309 // extension in both Microsoft and GNU. 2310 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2311 Tag && isa<EnumDecl>(Tag)) { 2312 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2313 << DS.getSourceRange(); 2314 return Tag; 2315 } 2316 2317 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2318 << DS.getSourceRange(); 2319 emittedWarning = true; 2320 } 2321 2322 // We're going to complain about a bunch of spurious specifiers; 2323 // only do this if we're declaring a tag, because otherwise we 2324 // should be getting diag::ext_no_declarators. 2325 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2326 return TagD; 2327 2328 // Note that a linkage-specification sets a storage class, but 2329 // 'extern "C" struct foo;' is actually valid and not theoretically 2330 // useless. 2331 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2332 if (!DS.isExternInLinkageSpec()) 2333 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2334 << DeclSpec::getSpecifierName(scs); 2335 2336 if (DS.isThreadSpecified()) 2337 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2338 if (DS.getTypeQualifiers()) { 2339 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2340 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2341 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2342 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2343 // Restrict is covered above. 2344 } 2345 if (DS.isInlineSpecified()) 2346 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2347 if (DS.isVirtualSpecified()) 2348 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2349 if (DS.isExplicitSpecified()) 2350 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2351 2352 // FIXME: Warn on useless attributes 2353 2354 return TagD; 2355} 2356 2357/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2358/// builds a statement for it and returns it so it is evaluated. 2359StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2360 StmtResult R; 2361 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2362 Expr *Exp = DS.getRepAsExpr(); 2363 QualType Ty = Exp->getType(); 2364 if (Ty->isPointerType()) { 2365 do 2366 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2367 while (Ty->isPointerType()); 2368 } 2369 if (Ty->isVariableArrayType()) { 2370 R = ActOnExprStmt(MakeFullExpr(Exp)); 2371 } 2372 } 2373 return R; 2374} 2375 2376/// We are trying to inject an anonymous member into the given scope; 2377/// check if there's an existing declaration that can't be overloaded. 2378/// 2379/// \return true if this is a forbidden redeclaration 2380static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2381 Scope *S, 2382 DeclContext *Owner, 2383 DeclarationName Name, 2384 SourceLocation NameLoc, 2385 unsigned diagnostic) { 2386 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2387 Sema::ForRedeclaration); 2388 if (!SemaRef.LookupName(R, S)) return false; 2389 2390 if (R.getAsSingle<TagDecl>()) 2391 return false; 2392 2393 // Pick a representative declaration. 2394 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2395 assert(PrevDecl && "Expected a non-null Decl"); 2396 2397 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2398 return false; 2399 2400 SemaRef.Diag(NameLoc, diagnostic) << Name; 2401 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2402 2403 return true; 2404} 2405 2406/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2407/// anonymous struct or union AnonRecord into the owning context Owner 2408/// and scope S. This routine will be invoked just after we realize 2409/// that an unnamed union or struct is actually an anonymous union or 2410/// struct, e.g., 2411/// 2412/// @code 2413/// union { 2414/// int i; 2415/// float f; 2416/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2417/// // f into the surrounding scope.x 2418/// @endcode 2419/// 2420/// This routine is recursive, injecting the names of nested anonymous 2421/// structs/unions into the owning context and scope as well. 2422static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2423 DeclContext *Owner, 2424 RecordDecl *AnonRecord, 2425 AccessSpecifier AS, 2426 SmallVector<NamedDecl*, 2> &Chaining, 2427 bool MSAnonStruct) { 2428 unsigned diagKind 2429 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2430 : diag::err_anonymous_struct_member_redecl; 2431 2432 bool Invalid = false; 2433 2434 // Look every FieldDecl and IndirectFieldDecl with a name. 2435 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2436 DEnd = AnonRecord->decls_end(); 2437 D != DEnd; ++D) { 2438 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2439 cast<NamedDecl>(*D)->getDeclName()) { 2440 ValueDecl *VD = cast<ValueDecl>(*D); 2441 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2442 VD->getLocation(), diagKind)) { 2443 // C++ [class.union]p2: 2444 // The names of the members of an anonymous union shall be 2445 // distinct from the names of any other entity in the 2446 // scope in which the anonymous union is declared. 2447 Invalid = true; 2448 } else { 2449 // C++ [class.union]p2: 2450 // For the purpose of name lookup, after the anonymous union 2451 // definition, the members of the anonymous union are 2452 // considered to have been defined in the scope in which the 2453 // anonymous union is declared. 2454 unsigned OldChainingSize = Chaining.size(); 2455 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2456 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2457 PE = IF->chain_end(); PI != PE; ++PI) 2458 Chaining.push_back(*PI); 2459 else 2460 Chaining.push_back(VD); 2461 2462 assert(Chaining.size() >= 2); 2463 NamedDecl **NamedChain = 2464 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2465 for (unsigned i = 0; i < Chaining.size(); i++) 2466 NamedChain[i] = Chaining[i]; 2467 2468 IndirectFieldDecl* IndirectField = 2469 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2470 VD->getIdentifier(), VD->getType(), 2471 NamedChain, Chaining.size()); 2472 2473 IndirectField->setAccess(AS); 2474 IndirectField->setImplicit(); 2475 SemaRef.PushOnScopeChains(IndirectField, S); 2476 2477 // That includes picking up the appropriate access specifier. 2478 if (AS != AS_none) IndirectField->setAccess(AS); 2479 2480 Chaining.resize(OldChainingSize); 2481 } 2482 } 2483 } 2484 2485 return Invalid; 2486} 2487 2488/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2489/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2490/// illegal input values are mapped to SC_None. 2491static StorageClass 2492StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2493 switch (StorageClassSpec) { 2494 case DeclSpec::SCS_unspecified: return SC_None; 2495 case DeclSpec::SCS_extern: return SC_Extern; 2496 case DeclSpec::SCS_static: return SC_Static; 2497 case DeclSpec::SCS_auto: return SC_Auto; 2498 case DeclSpec::SCS_register: return SC_Register; 2499 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2500 // Illegal SCSs map to None: error reporting is up to the caller. 2501 case DeclSpec::SCS_mutable: // Fall through. 2502 case DeclSpec::SCS_typedef: return SC_None; 2503 } 2504 llvm_unreachable("unknown storage class specifier"); 2505} 2506 2507/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2508/// a StorageClass. Any error reporting is up to the caller: 2509/// illegal input values are mapped to SC_None. 2510static StorageClass 2511StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2512 switch (StorageClassSpec) { 2513 case DeclSpec::SCS_unspecified: return SC_None; 2514 case DeclSpec::SCS_extern: return SC_Extern; 2515 case DeclSpec::SCS_static: return SC_Static; 2516 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2517 // Illegal SCSs map to None: error reporting is up to the caller. 2518 case DeclSpec::SCS_auto: // Fall through. 2519 case DeclSpec::SCS_mutable: // Fall through. 2520 case DeclSpec::SCS_register: // Fall through. 2521 case DeclSpec::SCS_typedef: return SC_None; 2522 } 2523 llvm_unreachable("unknown storage class specifier"); 2524} 2525 2526/// BuildAnonymousStructOrUnion - Handle the declaration of an 2527/// anonymous structure or union. Anonymous unions are a C++ feature 2528/// (C++ [class.union]) and a GNU C extension; anonymous structures 2529/// are a GNU C and GNU C++ extension. 2530Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2531 AccessSpecifier AS, 2532 RecordDecl *Record) { 2533 DeclContext *Owner = Record->getDeclContext(); 2534 2535 // Diagnose whether this anonymous struct/union is an extension. 2536 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2537 Diag(Record->getLocation(), diag::ext_anonymous_union); 2538 else if (!Record->isUnion()) 2539 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2540 2541 // C and C++ require different kinds of checks for anonymous 2542 // structs/unions. 2543 bool Invalid = false; 2544 if (getLangOptions().CPlusPlus) { 2545 const char* PrevSpec = 0; 2546 unsigned DiagID; 2547 // C++ [class.union]p3: 2548 // Anonymous unions declared in a named namespace or in the 2549 // global namespace shall be declared static. 2550 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2551 (isa<TranslationUnitDecl>(Owner) || 2552 (isa<NamespaceDecl>(Owner) && 2553 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2554 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2555 Invalid = true; 2556 2557 // Recover by adding 'static'. 2558 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2559 PrevSpec, DiagID, getLangOptions()); 2560 } 2561 // C++ [class.union]p3: 2562 // A storage class is not allowed in a declaration of an 2563 // anonymous union in a class scope. 2564 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2565 isa<RecordDecl>(Owner)) { 2566 Diag(DS.getStorageClassSpecLoc(), 2567 diag::err_anonymous_union_with_storage_spec); 2568 Invalid = true; 2569 2570 // Recover by removing the storage specifier. 2571 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2572 PrevSpec, DiagID, getLangOptions()); 2573 } 2574 2575 // Ignore const/volatile/restrict qualifiers. 2576 if (DS.getTypeQualifiers()) { 2577 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2578 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2579 << Record->isUnion() << 0 2580 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2581 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2582 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2583 << Record->isUnion() << 1 2584 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2585 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2586 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2587 << Record->isUnion() << 2 2588 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2589 2590 DS.ClearTypeQualifiers(); 2591 } 2592 2593 // C++ [class.union]p2: 2594 // The member-specification of an anonymous union shall only 2595 // define non-static data members. [Note: nested types and 2596 // functions cannot be declared within an anonymous union. ] 2597 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2598 MemEnd = Record->decls_end(); 2599 Mem != MemEnd; ++Mem) { 2600 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2601 // C++ [class.union]p3: 2602 // An anonymous union shall not have private or protected 2603 // members (clause 11). 2604 assert(FD->getAccess() != AS_none); 2605 if (FD->getAccess() != AS_public) { 2606 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2607 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2608 Invalid = true; 2609 } 2610 2611 // C++ [class.union]p1 2612 // An object of a class with a non-trivial constructor, a non-trivial 2613 // copy constructor, a non-trivial destructor, or a non-trivial copy 2614 // assignment operator cannot be a member of a union, nor can an 2615 // array of such objects. 2616 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2617 Invalid = true; 2618 } else if ((*Mem)->isImplicit()) { 2619 // Any implicit members are fine. 2620 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2621 // This is a type that showed up in an 2622 // elaborated-type-specifier inside the anonymous struct or 2623 // union, but which actually declares a type outside of the 2624 // anonymous struct or union. It's okay. 2625 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2626 if (!MemRecord->isAnonymousStructOrUnion() && 2627 MemRecord->getDeclName()) { 2628 // Visual C++ allows type definition in anonymous struct or union. 2629 if (getLangOptions().Microsoft) 2630 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2631 << (int)Record->isUnion(); 2632 else { 2633 // This is a nested type declaration. 2634 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2635 << (int)Record->isUnion(); 2636 Invalid = true; 2637 } 2638 } 2639 } else if (isa<AccessSpecDecl>(*Mem)) { 2640 // Any access specifier is fine. 2641 } else { 2642 // We have something that isn't a non-static data 2643 // member. Complain about it. 2644 unsigned DK = diag::err_anonymous_record_bad_member; 2645 if (isa<TypeDecl>(*Mem)) 2646 DK = diag::err_anonymous_record_with_type; 2647 else if (isa<FunctionDecl>(*Mem)) 2648 DK = diag::err_anonymous_record_with_function; 2649 else if (isa<VarDecl>(*Mem)) 2650 DK = diag::err_anonymous_record_with_static; 2651 2652 // Visual C++ allows type definition in anonymous struct or union. 2653 if (getLangOptions().Microsoft && 2654 DK == diag::err_anonymous_record_with_type) 2655 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2656 << (int)Record->isUnion(); 2657 else { 2658 Diag((*Mem)->getLocation(), DK) 2659 << (int)Record->isUnion(); 2660 Invalid = true; 2661 } 2662 } 2663 } 2664 } 2665 2666 if (!Record->isUnion() && !Owner->isRecord()) { 2667 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2668 << (int)getLangOptions().CPlusPlus; 2669 Invalid = true; 2670 } 2671 2672 // Mock up a declarator. 2673 Declarator Dc(DS, Declarator::MemberContext); 2674 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2675 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2676 2677 // Create a declaration for this anonymous struct/union. 2678 NamedDecl *Anon = 0; 2679 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2680 Anon = FieldDecl::Create(Context, OwningClass, 2681 DS.getSourceRange().getBegin(), 2682 Record->getLocation(), 2683 /*IdentifierInfo=*/0, 2684 Context.getTypeDeclType(Record), 2685 TInfo, 2686 /*BitWidth=*/0, /*Mutable=*/false, 2687 /*HasInit=*/false); 2688 Anon->setAccess(AS); 2689 if (getLangOptions().CPlusPlus) 2690 FieldCollector->Add(cast<FieldDecl>(Anon)); 2691 } else { 2692 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2693 assert(SCSpec != DeclSpec::SCS_typedef && 2694 "Parser allowed 'typedef' as storage class VarDecl."); 2695 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2696 if (SCSpec == DeclSpec::SCS_mutable) { 2697 // mutable can only appear on non-static class members, so it's always 2698 // an error here 2699 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2700 Invalid = true; 2701 SC = SC_None; 2702 } 2703 SCSpec = DS.getStorageClassSpecAsWritten(); 2704 VarDecl::StorageClass SCAsWritten 2705 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2706 2707 Anon = VarDecl::Create(Context, Owner, 2708 DS.getSourceRange().getBegin(), 2709 Record->getLocation(), /*IdentifierInfo=*/0, 2710 Context.getTypeDeclType(Record), 2711 TInfo, SC, SCAsWritten); 2712 } 2713 Anon->setImplicit(); 2714 2715 // Add the anonymous struct/union object to the current 2716 // context. We'll be referencing this object when we refer to one of 2717 // its members. 2718 Owner->addDecl(Anon); 2719 2720 // Inject the members of the anonymous struct/union into the owning 2721 // context and into the identifier resolver chain for name lookup 2722 // purposes. 2723 SmallVector<NamedDecl*, 2> Chain; 2724 Chain.push_back(Anon); 2725 2726 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2727 Chain, false)) 2728 Invalid = true; 2729 2730 // Mark this as an anonymous struct/union type. Note that we do not 2731 // do this until after we have already checked and injected the 2732 // members of this anonymous struct/union type, because otherwise 2733 // the members could be injected twice: once by DeclContext when it 2734 // builds its lookup table, and once by 2735 // InjectAnonymousStructOrUnionMembers. 2736 Record->setAnonymousStructOrUnion(true); 2737 2738 if (Invalid) 2739 Anon->setInvalidDecl(); 2740 2741 return Anon; 2742} 2743 2744/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2745/// Microsoft C anonymous structure. 2746/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2747/// Example: 2748/// 2749/// struct A { int a; }; 2750/// struct B { struct A; int b; }; 2751/// 2752/// void foo() { 2753/// B var; 2754/// var.a = 3; 2755/// } 2756/// 2757Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2758 RecordDecl *Record) { 2759 2760 // If there is no Record, get the record via the typedef. 2761 if (!Record) 2762 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2763 2764 // Mock up a declarator. 2765 Declarator Dc(DS, Declarator::TypeNameContext); 2766 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2767 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2768 2769 // Create a declaration for this anonymous struct. 2770 NamedDecl* Anon = FieldDecl::Create(Context, 2771 cast<RecordDecl>(CurContext), 2772 DS.getSourceRange().getBegin(), 2773 DS.getSourceRange().getBegin(), 2774 /*IdentifierInfo=*/0, 2775 Context.getTypeDeclType(Record), 2776 TInfo, 2777 /*BitWidth=*/0, /*Mutable=*/false, 2778 /*HasInit=*/false); 2779 Anon->setImplicit(); 2780 2781 // Add the anonymous struct object to the current context. 2782 CurContext->addDecl(Anon); 2783 2784 // Inject the members of the anonymous struct into the current 2785 // context and into the identifier resolver chain for name lookup 2786 // purposes. 2787 SmallVector<NamedDecl*, 2> Chain; 2788 Chain.push_back(Anon); 2789 2790 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2791 Record->getDefinition(), 2792 AS_none, Chain, true)) 2793 Anon->setInvalidDecl(); 2794 2795 return Anon; 2796} 2797 2798/// GetNameForDeclarator - Determine the full declaration name for the 2799/// given Declarator. 2800DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2801 return GetNameFromUnqualifiedId(D.getName()); 2802} 2803 2804/// \brief Retrieves the declaration name from a parsed unqualified-id. 2805DeclarationNameInfo 2806Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2807 DeclarationNameInfo NameInfo; 2808 NameInfo.setLoc(Name.StartLocation); 2809 2810 switch (Name.getKind()) { 2811 2812 case UnqualifiedId::IK_ImplicitSelfParam: 2813 case UnqualifiedId::IK_Identifier: 2814 NameInfo.setName(Name.Identifier); 2815 NameInfo.setLoc(Name.StartLocation); 2816 return NameInfo; 2817 2818 case UnqualifiedId::IK_OperatorFunctionId: 2819 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2820 Name.OperatorFunctionId.Operator)); 2821 NameInfo.setLoc(Name.StartLocation); 2822 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2823 = Name.OperatorFunctionId.SymbolLocations[0]; 2824 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2825 = Name.EndLocation.getRawEncoding(); 2826 return NameInfo; 2827 2828 case UnqualifiedId::IK_LiteralOperatorId: 2829 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2830 Name.Identifier)); 2831 NameInfo.setLoc(Name.StartLocation); 2832 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2833 return NameInfo; 2834 2835 case UnqualifiedId::IK_ConversionFunctionId: { 2836 TypeSourceInfo *TInfo; 2837 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2838 if (Ty.isNull()) 2839 return DeclarationNameInfo(); 2840 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2841 Context.getCanonicalType(Ty))); 2842 NameInfo.setLoc(Name.StartLocation); 2843 NameInfo.setNamedTypeInfo(TInfo); 2844 return NameInfo; 2845 } 2846 2847 case UnqualifiedId::IK_ConstructorName: { 2848 TypeSourceInfo *TInfo; 2849 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2850 if (Ty.isNull()) 2851 return DeclarationNameInfo(); 2852 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2853 Context.getCanonicalType(Ty))); 2854 NameInfo.setLoc(Name.StartLocation); 2855 NameInfo.setNamedTypeInfo(TInfo); 2856 return NameInfo; 2857 } 2858 2859 case UnqualifiedId::IK_ConstructorTemplateId: { 2860 // In well-formed code, we can only have a constructor 2861 // template-id that refers to the current context, so go there 2862 // to find the actual type being constructed. 2863 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2864 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2865 return DeclarationNameInfo(); 2866 2867 // Determine the type of the class being constructed. 2868 QualType CurClassType = Context.getTypeDeclType(CurClass); 2869 2870 // FIXME: Check two things: that the template-id names the same type as 2871 // CurClassType, and that the template-id does not occur when the name 2872 // was qualified. 2873 2874 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2875 Context.getCanonicalType(CurClassType))); 2876 NameInfo.setLoc(Name.StartLocation); 2877 // FIXME: should we retrieve TypeSourceInfo? 2878 NameInfo.setNamedTypeInfo(0); 2879 return NameInfo; 2880 } 2881 2882 case UnqualifiedId::IK_DestructorName: { 2883 TypeSourceInfo *TInfo; 2884 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2885 if (Ty.isNull()) 2886 return DeclarationNameInfo(); 2887 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2888 Context.getCanonicalType(Ty))); 2889 NameInfo.setLoc(Name.StartLocation); 2890 NameInfo.setNamedTypeInfo(TInfo); 2891 return NameInfo; 2892 } 2893 2894 case UnqualifiedId::IK_TemplateId: { 2895 TemplateName TName = Name.TemplateId->Template.get(); 2896 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2897 return Context.getNameForTemplate(TName, TNameLoc); 2898 } 2899 2900 } // switch (Name.getKind()) 2901 2902 assert(false && "Unknown name kind"); 2903 return DeclarationNameInfo(); 2904} 2905 2906static QualType getCoreType(QualType Ty) { 2907 do { 2908 if (Ty->isPointerType() || Ty->isReferenceType()) 2909 Ty = Ty->getPointeeType(); 2910 else if (Ty->isArrayType()) 2911 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2912 else 2913 return Ty.withoutLocalFastQualifiers(); 2914 } while (true); 2915} 2916 2917/// isNearlyMatchingFunction - Determine whether the C++ functions 2918/// Declaration and Definition are "nearly" matching. This heuristic 2919/// is used to improve diagnostics in the case where an out-of-line 2920/// function definition doesn't match any declaration within the class 2921/// or namespace. Also sets Params to the list of indices to the 2922/// parameters that differ between the declaration and the definition. 2923static bool isNearlyMatchingFunction(ASTContext &Context, 2924 FunctionDecl *Declaration, 2925 FunctionDecl *Definition, 2926 llvm::SmallVectorImpl<unsigned> &Params) { 2927 Params.clear(); 2928 if (Declaration->param_size() != Definition->param_size()) 2929 return false; 2930 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2931 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2932 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2933 2934 // The parameter types are identical 2935 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2936 continue; 2937 2938 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2939 QualType DefParamBaseTy = getCoreType(DefParamTy); 2940 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2941 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2942 2943 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2944 (DeclTyName && DeclTyName == DefTyName)) 2945 Params.push_back(Idx); 2946 else // The two parameters aren't even close 2947 return false; 2948 } 2949 2950 return true; 2951} 2952 2953/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2954/// declarator needs to be rebuilt in the current instantiation. 2955/// Any bits of declarator which appear before the name are valid for 2956/// consideration here. That's specifically the type in the decl spec 2957/// and the base type in any member-pointer chunks. 2958static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2959 DeclarationName Name) { 2960 // The types we specifically need to rebuild are: 2961 // - typenames, typeofs, and decltypes 2962 // - types which will become injected class names 2963 // Of course, we also need to rebuild any type referencing such a 2964 // type. It's safest to just say "dependent", but we call out a 2965 // few cases here. 2966 2967 DeclSpec &DS = D.getMutableDeclSpec(); 2968 switch (DS.getTypeSpecType()) { 2969 case DeclSpec::TST_typename: 2970 case DeclSpec::TST_typeofType: 2971 case DeclSpec::TST_decltype: 2972 case DeclSpec::TST_underlyingType: { 2973 // Grab the type from the parser. 2974 TypeSourceInfo *TSI = 0; 2975 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2976 if (T.isNull() || !T->isDependentType()) break; 2977 2978 // Make sure there's a type source info. This isn't really much 2979 // of a waste; most dependent types should have type source info 2980 // attached already. 2981 if (!TSI) 2982 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2983 2984 // Rebuild the type in the current instantiation. 2985 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2986 if (!TSI) return true; 2987 2988 // Store the new type back in the decl spec. 2989 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2990 DS.UpdateTypeRep(LocType); 2991 break; 2992 } 2993 2994 case DeclSpec::TST_typeofExpr: { 2995 Expr *E = DS.getRepAsExpr(); 2996 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2997 if (Result.isInvalid()) return true; 2998 DS.UpdateExprRep(Result.get()); 2999 break; 3000 } 3001 3002 default: 3003 // Nothing to do for these decl specs. 3004 break; 3005 } 3006 3007 // It doesn't matter what order we do this in. 3008 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3009 DeclaratorChunk &Chunk = D.getTypeObject(I); 3010 3011 // The only type information in the declarator which can come 3012 // before the declaration name is the base type of a member 3013 // pointer. 3014 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3015 continue; 3016 3017 // Rebuild the scope specifier in-place. 3018 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3019 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3020 return true; 3021 } 3022 3023 return false; 3024} 3025 3026Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3027 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3028 /*IsFunctionDefinition=*/false); 3029} 3030 3031/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3032/// If T is the name of a class, then each of the following shall have a 3033/// name different from T: 3034/// - every static data member of class T; 3035/// - every member function of class T 3036/// - every member of class T that is itself a type; 3037/// \returns true if the declaration name violates these rules. 3038bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3039 DeclarationNameInfo NameInfo) { 3040 DeclarationName Name = NameInfo.getName(); 3041 3042 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3043 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3044 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3045 return true; 3046 } 3047 3048 return false; 3049} 3050 3051Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3052 MultiTemplateParamsArg TemplateParamLists, 3053 bool IsFunctionDefinition) { 3054 // TODO: consider using NameInfo for diagnostic. 3055 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3056 DeclarationName Name = NameInfo.getName(); 3057 3058 // All of these full declarators require an identifier. If it doesn't have 3059 // one, the ParsedFreeStandingDeclSpec action should be used. 3060 if (!Name) { 3061 if (!D.isInvalidType()) // Reject this if we think it is valid. 3062 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3063 diag::err_declarator_need_ident) 3064 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3065 return 0; 3066 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3067 return 0; 3068 3069 // The scope passed in may not be a decl scope. Zip up the scope tree until 3070 // we find one that is. 3071 while ((S->getFlags() & Scope::DeclScope) == 0 || 3072 (S->getFlags() & Scope::TemplateParamScope) != 0) 3073 S = S->getParent(); 3074 3075 DeclContext *DC = CurContext; 3076 if (D.getCXXScopeSpec().isInvalid()) 3077 D.setInvalidType(); 3078 else if (D.getCXXScopeSpec().isSet()) { 3079 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3080 UPPC_DeclarationQualifier)) 3081 return 0; 3082 3083 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3084 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3085 if (!DC) { 3086 // If we could not compute the declaration context, it's because the 3087 // declaration context is dependent but does not refer to a class, 3088 // class template, or class template partial specialization. Complain 3089 // and return early, to avoid the coming semantic disaster. 3090 Diag(D.getIdentifierLoc(), 3091 diag::err_template_qualified_declarator_no_match) 3092 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3093 << D.getCXXScopeSpec().getRange(); 3094 return 0; 3095 } 3096 bool IsDependentContext = DC->isDependentContext(); 3097 3098 if (!IsDependentContext && 3099 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3100 return 0; 3101 3102 if (isa<CXXRecordDecl>(DC)) { 3103 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3104 Diag(D.getIdentifierLoc(), 3105 diag::err_member_def_undefined_record) 3106 << Name << DC << D.getCXXScopeSpec().getRange(); 3107 D.setInvalidType(); 3108 } else if (isa<CXXRecordDecl>(CurContext) && 3109 !D.getDeclSpec().isFriendSpecified()) { 3110 // The user provided a superfluous scope specifier inside a class 3111 // definition: 3112 // 3113 // class X { 3114 // void X::f(); 3115 // }; 3116 if (CurContext->Equals(DC)) 3117 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3118 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3119 else 3120 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3121 << Name << D.getCXXScopeSpec().getRange(); 3122 3123 // Pretend that this qualifier was not here. 3124 D.getCXXScopeSpec().clear(); 3125 } 3126 } 3127 3128 // Check whether we need to rebuild the type of the given 3129 // declaration in the current instantiation. 3130 if (EnteringContext && IsDependentContext && 3131 TemplateParamLists.size() != 0) { 3132 ContextRAII SavedContext(*this, DC); 3133 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3134 D.setInvalidType(); 3135 } 3136 } 3137 3138 if (DiagnoseClassNameShadow(DC, NameInfo)) 3139 // If this is a typedef, we'll end up spewing multiple diagnostics. 3140 // Just return early; it's safer. 3141 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3142 return 0; 3143 3144 NamedDecl *New; 3145 3146 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3147 QualType R = TInfo->getType(); 3148 3149 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3150 UPPC_DeclarationType)) 3151 D.setInvalidType(); 3152 3153 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3154 ForRedeclaration); 3155 3156 // See if this is a redefinition of a variable in the same scope. 3157 if (!D.getCXXScopeSpec().isSet()) { 3158 bool IsLinkageLookup = false; 3159 3160 // If the declaration we're planning to build will be a function 3161 // or object with linkage, then look for another declaration with 3162 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3163 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3164 /* Do nothing*/; 3165 else if (R->isFunctionType()) { 3166 if (CurContext->isFunctionOrMethod() || 3167 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3168 IsLinkageLookup = true; 3169 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3170 IsLinkageLookup = true; 3171 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3172 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3173 IsLinkageLookup = true; 3174 3175 if (IsLinkageLookup) 3176 Previous.clear(LookupRedeclarationWithLinkage); 3177 3178 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3179 } else { // Something like "int foo::x;" 3180 LookupQualifiedName(Previous, DC); 3181 3182 // Don't consider using declarations as previous declarations for 3183 // out-of-line members. 3184 RemoveUsingDecls(Previous); 3185 3186 // C++ 7.3.1.2p2: 3187 // Members (including explicit specializations of templates) of a named 3188 // namespace can also be defined outside that namespace by explicit 3189 // qualification of the name being defined, provided that the entity being 3190 // defined was already declared in the namespace and the definition appears 3191 // after the point of declaration in a namespace that encloses the 3192 // declarations namespace. 3193 // 3194 // Note that we only check the context at this point. We don't yet 3195 // have enough information to make sure that PrevDecl is actually 3196 // the declaration we want to match. For example, given: 3197 // 3198 // class X { 3199 // void f(); 3200 // void f(float); 3201 // }; 3202 // 3203 // void X::f(int) { } // ill-formed 3204 // 3205 // In this case, PrevDecl will point to the overload set 3206 // containing the two f's declared in X, but neither of them 3207 // matches. 3208 3209 // First check whether we named the global scope. 3210 if (isa<TranslationUnitDecl>(DC)) { 3211 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3212 << Name << D.getCXXScopeSpec().getRange(); 3213 } else { 3214 DeclContext *Cur = CurContext; 3215 while (isa<LinkageSpecDecl>(Cur)) 3216 Cur = Cur->getParent(); 3217 if (!Cur->Encloses(DC)) { 3218 // The qualifying scope doesn't enclose the original declaration. 3219 // Emit diagnostic based on current scope. 3220 SourceLocation L = D.getIdentifierLoc(); 3221 SourceRange R = D.getCXXScopeSpec().getRange(); 3222 if (isa<FunctionDecl>(Cur)) 3223 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3224 else 3225 Diag(L, diag::err_invalid_declarator_scope) 3226 << Name << cast<NamedDecl>(DC) << R; 3227 D.setInvalidType(); 3228 } 3229 } 3230 } 3231 3232 if (Previous.isSingleResult() && 3233 Previous.getFoundDecl()->isTemplateParameter()) { 3234 // Maybe we will complain about the shadowed template parameter. 3235 if (!D.isInvalidType()) 3236 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3237 Previous.getFoundDecl())) 3238 D.setInvalidType(); 3239 3240 // Just pretend that we didn't see the previous declaration. 3241 Previous.clear(); 3242 } 3243 3244 // In C++, the previous declaration we find might be a tag type 3245 // (class or enum). In this case, the new declaration will hide the 3246 // tag type. Note that this does does not apply if we're declaring a 3247 // typedef (C++ [dcl.typedef]p4). 3248 if (Previous.isSingleTagDecl() && 3249 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3250 Previous.clear(); 3251 3252 bool Redeclaration = false; 3253 bool AddToScope = true; 3254 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3255 if (TemplateParamLists.size()) { 3256 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3257 return 0; 3258 } 3259 3260 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3261 } else if (R->isFunctionType()) { 3262 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3263 move(TemplateParamLists), 3264 IsFunctionDefinition, Redeclaration, 3265 AddToScope); 3266 } else { 3267 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3268 move(TemplateParamLists), 3269 Redeclaration); 3270 } 3271 3272 if (New == 0) 3273 return 0; 3274 3275 // If this has an identifier and is not an invalid redeclaration or 3276 // function template specialization, add it to the scope stack. 3277 if (New->getDeclName() && AddToScope && 3278 !(Redeclaration && New->isInvalidDecl())) 3279 PushOnScopeChains(New, S); 3280 3281 return New; 3282} 3283 3284/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3285/// types into constant array types in certain situations which would otherwise 3286/// be errors (for GCC compatibility). 3287static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3288 ASTContext &Context, 3289 bool &SizeIsNegative, 3290 llvm::APSInt &Oversized) { 3291 // This method tries to turn a variable array into a constant 3292 // array even when the size isn't an ICE. This is necessary 3293 // for compatibility with code that depends on gcc's buggy 3294 // constant expression folding, like struct {char x[(int)(char*)2];} 3295 SizeIsNegative = false; 3296 Oversized = 0; 3297 3298 if (T->isDependentType()) 3299 return QualType(); 3300 3301 QualifierCollector Qs; 3302 const Type *Ty = Qs.strip(T); 3303 3304 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3305 QualType Pointee = PTy->getPointeeType(); 3306 QualType FixedType = 3307 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3308 Oversized); 3309 if (FixedType.isNull()) return FixedType; 3310 FixedType = Context.getPointerType(FixedType); 3311 return Qs.apply(Context, FixedType); 3312 } 3313 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3314 QualType Inner = PTy->getInnerType(); 3315 QualType FixedType = 3316 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3317 Oversized); 3318 if (FixedType.isNull()) return FixedType; 3319 FixedType = Context.getParenType(FixedType); 3320 return Qs.apply(Context, FixedType); 3321 } 3322 3323 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3324 if (!VLATy) 3325 return QualType(); 3326 // FIXME: We should probably handle this case 3327 if (VLATy->getElementType()->isVariablyModifiedType()) 3328 return QualType(); 3329 3330 Expr::EvalResult EvalResult; 3331 if (!VLATy->getSizeExpr() || 3332 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3333 !EvalResult.Val.isInt()) 3334 return QualType(); 3335 3336 // Check whether the array size is negative. 3337 llvm::APSInt &Res = EvalResult.Val.getInt(); 3338 if (Res.isSigned() && Res.isNegative()) { 3339 SizeIsNegative = true; 3340 return QualType(); 3341 } 3342 3343 // Check whether the array is too large to be addressed. 3344 unsigned ActiveSizeBits 3345 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3346 Res); 3347 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3348 Oversized = Res; 3349 return QualType(); 3350 } 3351 3352 return Context.getConstantArrayType(VLATy->getElementType(), 3353 Res, ArrayType::Normal, 0); 3354} 3355 3356/// \brief Register the given locally-scoped external C declaration so 3357/// that it can be found later for redeclarations 3358void 3359Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3360 const LookupResult &Previous, 3361 Scope *S) { 3362 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3363 "Decl is not a locally-scoped decl!"); 3364 // Note that we have a locally-scoped external with this name. 3365 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3366 3367 if (!Previous.isSingleResult()) 3368 return; 3369 3370 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3371 3372 // If there was a previous declaration of this variable, it may be 3373 // in our identifier chain. Update the identifier chain with the new 3374 // declaration. 3375 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3376 // The previous declaration was found on the identifer resolver 3377 // chain, so remove it from its scope. 3378 3379 if (S->isDeclScope(PrevDecl)) { 3380 // Special case for redeclarations in the SAME scope. 3381 // Because this declaration is going to be added to the identifier chain 3382 // later, we should temporarily take it OFF the chain. 3383 IdResolver.RemoveDecl(ND); 3384 3385 } else { 3386 // Find the scope for the original declaration. 3387 while (S && !S->isDeclScope(PrevDecl)) 3388 S = S->getParent(); 3389 } 3390 3391 if (S) 3392 S->RemoveDecl(PrevDecl); 3393 } 3394} 3395 3396llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3397Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3398 if (ExternalSource) { 3399 // Load locally-scoped external decls from the external source. 3400 SmallVector<NamedDecl *, 4> Decls; 3401 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3402 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3403 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3404 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3405 if (Pos == LocallyScopedExternalDecls.end()) 3406 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3407 } 3408 } 3409 3410 return LocallyScopedExternalDecls.find(Name); 3411} 3412 3413/// \brief Diagnose function specifiers on a declaration of an identifier that 3414/// does not identify a function. 3415void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3416 // FIXME: We should probably indicate the identifier in question to avoid 3417 // confusion for constructs like "inline int a(), b;" 3418 if (D.getDeclSpec().isInlineSpecified()) 3419 Diag(D.getDeclSpec().getInlineSpecLoc(), 3420 diag::err_inline_non_function); 3421 3422 if (D.getDeclSpec().isVirtualSpecified()) 3423 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3424 diag::err_virtual_non_function); 3425 3426 if (D.getDeclSpec().isExplicitSpecified()) 3427 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3428 diag::err_explicit_non_function); 3429} 3430 3431NamedDecl* 3432Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3433 QualType R, TypeSourceInfo *TInfo, 3434 LookupResult &Previous, bool &Redeclaration) { 3435 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3436 if (D.getCXXScopeSpec().isSet()) { 3437 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3438 << D.getCXXScopeSpec().getRange(); 3439 D.setInvalidType(); 3440 // Pretend we didn't see the scope specifier. 3441 DC = CurContext; 3442 Previous.clear(); 3443 } 3444 3445 if (getLangOptions().CPlusPlus) { 3446 // Check that there are no default arguments (C++ only). 3447 CheckExtraCXXDefaultArguments(D); 3448 } 3449 3450 DiagnoseFunctionSpecifiers(D); 3451 3452 if (D.getDeclSpec().isThreadSpecified()) 3453 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3454 if (D.getDeclSpec().isConstexprSpecified()) 3455 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3456 << 1; 3457 3458 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3459 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3460 << D.getName().getSourceRange(); 3461 return 0; 3462 } 3463 3464 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3465 if (!NewTD) return 0; 3466 3467 // Handle attributes prior to checking for duplicates in MergeVarDecl 3468 ProcessDeclAttributes(S, NewTD, D); 3469 3470 CheckTypedefForVariablyModifiedType(S, NewTD); 3471 3472 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3473} 3474 3475void 3476Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3477 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3478 // then it shall have block scope. 3479 // Note that variably modified types must be fixed before merging the decl so 3480 // that redeclarations will match. 3481 QualType T = NewTD->getUnderlyingType(); 3482 if (T->isVariablyModifiedType()) { 3483 getCurFunction()->setHasBranchProtectedScope(); 3484 3485 if (S->getFnParent() == 0) { 3486 bool SizeIsNegative; 3487 llvm::APSInt Oversized; 3488 QualType FixedTy = 3489 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3490 Oversized); 3491 if (!FixedTy.isNull()) { 3492 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3493 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3494 } else { 3495 if (SizeIsNegative) 3496 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3497 else if (T->isVariableArrayType()) 3498 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3499 else if (Oversized.getBoolValue()) 3500 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3501 else 3502 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3503 NewTD->setInvalidDecl(); 3504 } 3505 } 3506 } 3507} 3508 3509 3510/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3511/// declares a typedef-name, either using the 'typedef' type specifier or via 3512/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3513NamedDecl* 3514Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3515 LookupResult &Previous, bool &Redeclaration) { 3516 // Merge the decl with the existing one if appropriate. If the decl is 3517 // in an outer scope, it isn't the same thing. 3518 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3519 /*ExplicitInstantiationOrSpecialization=*/false); 3520 if (!Previous.empty()) { 3521 Redeclaration = true; 3522 MergeTypedefNameDecl(NewTD, Previous); 3523 } 3524 3525 // If this is the C FILE type, notify the AST context. 3526 if (IdentifierInfo *II = NewTD->getIdentifier()) 3527 if (!NewTD->isInvalidDecl() && 3528 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3529 if (II->isStr("FILE")) 3530 Context.setFILEDecl(NewTD); 3531 else if (II->isStr("jmp_buf")) 3532 Context.setjmp_bufDecl(NewTD); 3533 else if (II->isStr("sigjmp_buf")) 3534 Context.setsigjmp_bufDecl(NewTD); 3535 else if (II->isStr("__builtin_va_list")) 3536 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3537 } 3538 3539 return NewTD; 3540} 3541 3542/// \brief Determines whether the given declaration is an out-of-scope 3543/// previous declaration. 3544/// 3545/// This routine should be invoked when name lookup has found a 3546/// previous declaration (PrevDecl) that is not in the scope where a 3547/// new declaration by the same name is being introduced. If the new 3548/// declaration occurs in a local scope, previous declarations with 3549/// linkage may still be considered previous declarations (C99 3550/// 6.2.2p4-5, C++ [basic.link]p6). 3551/// 3552/// \param PrevDecl the previous declaration found by name 3553/// lookup 3554/// 3555/// \param DC the context in which the new declaration is being 3556/// declared. 3557/// 3558/// \returns true if PrevDecl is an out-of-scope previous declaration 3559/// for a new delcaration with the same name. 3560static bool 3561isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3562 ASTContext &Context) { 3563 if (!PrevDecl) 3564 return false; 3565 3566 if (!PrevDecl->hasLinkage()) 3567 return false; 3568 3569 if (Context.getLangOptions().CPlusPlus) { 3570 // C++ [basic.link]p6: 3571 // If there is a visible declaration of an entity with linkage 3572 // having the same name and type, ignoring entities declared 3573 // outside the innermost enclosing namespace scope, the block 3574 // scope declaration declares that same entity and receives the 3575 // linkage of the previous declaration. 3576 DeclContext *OuterContext = DC->getRedeclContext(); 3577 if (!OuterContext->isFunctionOrMethod()) 3578 // This rule only applies to block-scope declarations. 3579 return false; 3580 3581 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3582 if (PrevOuterContext->isRecord()) 3583 // We found a member function: ignore it. 3584 return false; 3585 3586 // Find the innermost enclosing namespace for the new and 3587 // previous declarations. 3588 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3589 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3590 3591 // The previous declaration is in a different namespace, so it 3592 // isn't the same function. 3593 if (!OuterContext->Equals(PrevOuterContext)) 3594 return false; 3595 } 3596 3597 return true; 3598} 3599 3600static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3601 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3602 if (!SS.isSet()) return; 3603 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3604} 3605 3606bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3607 QualType type = decl->getType(); 3608 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3609 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3610 // Various kinds of declaration aren't allowed to be __autoreleasing. 3611 unsigned kind = -1U; 3612 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3613 if (var->hasAttr<BlocksAttr>()) 3614 kind = 0; // __block 3615 else if (!var->hasLocalStorage()) 3616 kind = 1; // global 3617 } else if (isa<ObjCIvarDecl>(decl)) { 3618 kind = 3; // ivar 3619 } else if (isa<FieldDecl>(decl)) { 3620 kind = 2; // field 3621 } 3622 3623 if (kind != -1U) { 3624 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3625 << kind; 3626 } 3627 } else if (lifetime == Qualifiers::OCL_None) { 3628 // Try to infer lifetime. 3629 if (!type->isObjCLifetimeType()) 3630 return false; 3631 3632 lifetime = type->getObjCARCImplicitLifetime(); 3633 type = Context.getLifetimeQualifiedType(type, lifetime); 3634 decl->setType(type); 3635 } 3636 3637 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3638 // Thread-local variables cannot have lifetime. 3639 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3640 var->isThreadSpecified()) { 3641 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3642 << var->getType(); 3643 return true; 3644 } 3645 } 3646 3647 return false; 3648} 3649 3650NamedDecl* 3651Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3652 QualType R, TypeSourceInfo *TInfo, 3653 LookupResult &Previous, 3654 MultiTemplateParamsArg TemplateParamLists, 3655 bool &Redeclaration) { 3656 DeclarationName Name = GetNameForDeclarator(D).getName(); 3657 3658 // Check that there are no default arguments (C++ only). 3659 if (getLangOptions().CPlusPlus) 3660 CheckExtraCXXDefaultArguments(D); 3661 3662 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3663 assert(SCSpec != DeclSpec::SCS_typedef && 3664 "Parser allowed 'typedef' as storage class VarDecl."); 3665 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3666 if (SCSpec == DeclSpec::SCS_mutable) { 3667 // mutable can only appear on non-static class members, so it's always 3668 // an error here 3669 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3670 D.setInvalidType(); 3671 SC = SC_None; 3672 } 3673 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3674 VarDecl::StorageClass SCAsWritten 3675 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3676 3677 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3678 if (!II) { 3679 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3680 << Name.getAsString(); 3681 return 0; 3682 } 3683 3684 DiagnoseFunctionSpecifiers(D); 3685 3686 if (!DC->isRecord() && S->getFnParent() == 0) { 3687 // C99 6.9p2: The storage-class specifiers auto and register shall not 3688 // appear in the declaration specifiers in an external declaration. 3689 if (SC == SC_Auto || SC == SC_Register) { 3690 3691 // If this is a register variable with an asm label specified, then this 3692 // is a GNU extension. 3693 if (SC == SC_Register && D.getAsmLabel()) 3694 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3695 else 3696 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3697 D.setInvalidType(); 3698 } 3699 } 3700 3701 bool isExplicitSpecialization = false; 3702 VarDecl *NewVD; 3703 if (!getLangOptions().CPlusPlus) { 3704 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3705 D.getIdentifierLoc(), II, 3706 R, TInfo, SC, SCAsWritten); 3707 3708 if (D.isInvalidType()) 3709 NewVD->setInvalidDecl(); 3710 } else { 3711 if (DC->isRecord() && !CurContext->isRecord()) { 3712 // This is an out-of-line definition of a static data member. 3713 if (SC == SC_Static) { 3714 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3715 diag::err_static_out_of_line) 3716 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3717 } else if (SC == SC_None) 3718 SC = SC_Static; 3719 } 3720 if (SC == SC_Static) { 3721 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3722 if (RD->isLocalClass()) 3723 Diag(D.getIdentifierLoc(), 3724 diag::err_static_data_member_not_allowed_in_local_class) 3725 << Name << RD->getDeclName(); 3726 3727 // C++ [class.union]p1: If a union contains a static data member, 3728 // the program is ill-formed. 3729 // 3730 // We also disallow static data members in anonymous structs. 3731 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3732 Diag(D.getIdentifierLoc(), 3733 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3734 << Name << RD->isUnion(); 3735 } 3736 } 3737 3738 // Match up the template parameter lists with the scope specifier, then 3739 // determine whether we have a template or a template specialization. 3740 isExplicitSpecialization = false; 3741 bool Invalid = false; 3742 if (TemplateParameterList *TemplateParams 3743 = MatchTemplateParametersToScopeSpecifier( 3744 D.getDeclSpec().getSourceRange().getBegin(), 3745 D.getIdentifierLoc(), 3746 D.getCXXScopeSpec(), 3747 TemplateParamLists.get(), 3748 TemplateParamLists.size(), 3749 /*never a friend*/ false, 3750 isExplicitSpecialization, 3751 Invalid)) { 3752 if (TemplateParams->size() > 0) { 3753 // There is no such thing as a variable template. 3754 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3755 << II 3756 << SourceRange(TemplateParams->getTemplateLoc(), 3757 TemplateParams->getRAngleLoc()); 3758 return 0; 3759 } else { 3760 // There is an extraneous 'template<>' for this variable. Complain 3761 // about it, but allow the declaration of the variable. 3762 Diag(TemplateParams->getTemplateLoc(), 3763 diag::err_template_variable_noparams) 3764 << II 3765 << SourceRange(TemplateParams->getTemplateLoc(), 3766 TemplateParams->getRAngleLoc()); 3767 } 3768 } 3769 3770 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3771 D.getIdentifierLoc(), II, 3772 R, TInfo, SC, SCAsWritten); 3773 3774 // If this decl has an auto type in need of deduction, make a note of the 3775 // Decl so we can diagnose uses of it in its own initializer. 3776 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3777 R->getContainedAutoType()) 3778 ParsingInitForAutoVars.insert(NewVD); 3779 3780 if (D.isInvalidType() || Invalid) 3781 NewVD->setInvalidDecl(); 3782 3783 SetNestedNameSpecifier(NewVD, D); 3784 3785 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3786 NewVD->setTemplateParameterListsInfo(Context, 3787 TemplateParamLists.size(), 3788 TemplateParamLists.release()); 3789 } 3790 3791 if (D.getDeclSpec().isConstexprSpecified()) { 3792 // FIXME: check this is a valid use of constexpr. 3793 NewVD->setConstexpr(true); 3794 } 3795 } 3796 3797 if (D.getDeclSpec().isThreadSpecified()) { 3798 if (NewVD->hasLocalStorage()) 3799 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3800 else if (!Context.getTargetInfo().isTLSSupported()) 3801 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3802 else 3803 NewVD->setThreadSpecified(true); 3804 } 3805 3806 if (D.getDeclSpec().isModulePrivateSpecified()) 3807 NewVD->setModulePrivate(); 3808 3809 // Set the lexical context. If the declarator has a C++ scope specifier, the 3810 // lexical context will be different from the semantic context. 3811 NewVD->setLexicalDeclContext(CurContext); 3812 3813 // Handle attributes prior to checking for duplicates in MergeVarDecl 3814 ProcessDeclAttributes(S, NewVD, D); 3815 3816 // In auto-retain/release, infer strong retension for variables of 3817 // retainable type. 3818 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3819 NewVD->setInvalidDecl(); 3820 3821 // Handle GNU asm-label extension (encoded as an attribute). 3822 if (Expr *E = (Expr*)D.getAsmLabel()) { 3823 // The parser guarantees this is a string. 3824 StringLiteral *SE = cast<StringLiteral>(E); 3825 StringRef Label = SE->getString(); 3826 if (S->getFnParent() != 0) { 3827 switch (SC) { 3828 case SC_None: 3829 case SC_Auto: 3830 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3831 break; 3832 case SC_Register: 3833 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3834 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3835 break; 3836 case SC_Static: 3837 case SC_Extern: 3838 case SC_PrivateExtern: 3839 break; 3840 } 3841 } 3842 3843 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3844 Context, Label)); 3845 } 3846 3847 // Diagnose shadowed variables before filtering for scope. 3848 if (!D.getCXXScopeSpec().isSet()) 3849 CheckShadow(S, NewVD, Previous); 3850 3851 // Don't consider existing declarations that are in a different 3852 // scope and are out-of-semantic-context declarations (if the new 3853 // declaration has linkage). 3854 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3855 isExplicitSpecialization); 3856 3857 if (!getLangOptions().CPlusPlus) 3858 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3859 else { 3860 // Merge the decl with the existing one if appropriate. 3861 if (!Previous.empty()) { 3862 if (Previous.isSingleResult() && 3863 isa<FieldDecl>(Previous.getFoundDecl()) && 3864 D.getCXXScopeSpec().isSet()) { 3865 // The user tried to define a non-static data member 3866 // out-of-line (C++ [dcl.meaning]p1). 3867 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3868 << D.getCXXScopeSpec().getRange(); 3869 Previous.clear(); 3870 NewVD->setInvalidDecl(); 3871 } 3872 } else if (D.getCXXScopeSpec().isSet()) { 3873 // No previous declaration in the qualifying scope. 3874 Diag(D.getIdentifierLoc(), diag::err_no_member) 3875 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3876 << D.getCXXScopeSpec().getRange(); 3877 NewVD->setInvalidDecl(); 3878 } 3879 3880 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3881 3882 // This is an explicit specialization of a static data member. Check it. 3883 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3884 CheckMemberSpecialization(NewVD, Previous)) 3885 NewVD->setInvalidDecl(); 3886 } 3887 3888 // attributes declared post-definition are currently ignored 3889 // FIXME: This should be handled in attribute merging, not 3890 // here. 3891 if (Previous.isSingleResult()) { 3892 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3893 if (Def && (Def = Def->getDefinition()) && 3894 Def != NewVD && D.hasAttributes()) { 3895 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3896 Diag(Def->getLocation(), diag::note_previous_definition); 3897 } 3898 } 3899 3900 // If this is a locally-scoped extern C variable, update the map of 3901 // such variables. 3902 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3903 !NewVD->isInvalidDecl()) 3904 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3905 3906 // If there's a #pragma GCC visibility in scope, and this isn't a class 3907 // member, set the visibility of this variable. 3908 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3909 AddPushedVisibilityAttribute(NewVD); 3910 3911 MarkUnusedFileScopedDecl(NewVD); 3912 3913 return NewVD; 3914} 3915 3916/// \brief Diagnose variable or built-in function shadowing. Implements 3917/// -Wshadow. 3918/// 3919/// This method is called whenever a VarDecl is added to a "useful" 3920/// scope. 3921/// 3922/// \param S the scope in which the shadowing name is being declared 3923/// \param R the lookup of the name 3924/// 3925void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3926 // Return if warning is ignored. 3927 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3928 Diagnostic::Ignored) 3929 return; 3930 3931 // Don't diagnose declarations at file scope. 3932 if (D->hasGlobalStorage()) 3933 return; 3934 3935 DeclContext *NewDC = D->getDeclContext(); 3936 3937 // Only diagnose if we're shadowing an unambiguous field or variable. 3938 if (R.getResultKind() != LookupResult::Found) 3939 return; 3940 3941 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3942 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3943 return; 3944 3945 // Fields are not shadowed by variables in C++ static methods. 3946 if (isa<FieldDecl>(ShadowedDecl)) 3947 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3948 if (MD->isStatic()) 3949 return; 3950 3951 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3952 if (shadowedVar->isExternC()) { 3953 // For shadowing external vars, make sure that we point to the global 3954 // declaration, not a locally scoped extern declaration. 3955 for (VarDecl::redecl_iterator 3956 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3957 I != E; ++I) 3958 if (I->isFileVarDecl()) { 3959 ShadowedDecl = *I; 3960 break; 3961 } 3962 } 3963 3964 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3965 3966 // Only warn about certain kinds of shadowing for class members. 3967 if (NewDC && NewDC->isRecord()) { 3968 // In particular, don't warn about shadowing non-class members. 3969 if (!OldDC->isRecord()) 3970 return; 3971 3972 // TODO: should we warn about static data members shadowing 3973 // static data members from base classes? 3974 3975 // TODO: don't diagnose for inaccessible shadowed members. 3976 // This is hard to do perfectly because we might friend the 3977 // shadowing context, but that's just a false negative. 3978 } 3979 3980 // Determine what kind of declaration we're shadowing. 3981 unsigned Kind; 3982 if (isa<RecordDecl>(OldDC)) { 3983 if (isa<FieldDecl>(ShadowedDecl)) 3984 Kind = 3; // field 3985 else 3986 Kind = 2; // static data member 3987 } else if (OldDC->isFileContext()) 3988 Kind = 1; // global 3989 else 3990 Kind = 0; // local 3991 3992 DeclarationName Name = R.getLookupName(); 3993 3994 // Emit warning and note. 3995 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3996 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3997} 3998 3999/// \brief Check -Wshadow without the advantage of a previous lookup. 4000void Sema::CheckShadow(Scope *S, VarDecl *D) { 4001 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4002 Diagnostic::Ignored) 4003 return; 4004 4005 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4006 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4007 LookupName(R, S); 4008 CheckShadow(S, D, R); 4009} 4010 4011/// \brief Perform semantic checking on a newly-created variable 4012/// declaration. 4013/// 4014/// This routine performs all of the type-checking required for a 4015/// variable declaration once it has been built. It is used both to 4016/// check variables after they have been parsed and their declarators 4017/// have been translated into a declaration, and to check variables 4018/// that have been instantiated from a template. 4019/// 4020/// Sets NewVD->isInvalidDecl() if an error was encountered. 4021void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4022 LookupResult &Previous, 4023 bool &Redeclaration) { 4024 // If the decl is already known invalid, don't check it. 4025 if (NewVD->isInvalidDecl()) 4026 return; 4027 4028 QualType T = NewVD->getType(); 4029 4030 if (T->isObjCObjectType()) { 4031 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4032 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4033 T = Context.getObjCObjectPointerType(T); 4034 NewVD->setType(T); 4035 } 4036 4037 // Emit an error if an address space was applied to decl with local storage. 4038 // This includes arrays of objects with address space qualifiers, but not 4039 // automatic variables that point to other address spaces. 4040 // ISO/IEC TR 18037 S5.1.2 4041 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4042 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4043 return NewVD->setInvalidDecl(); 4044 } 4045 4046 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4047 && !NewVD->hasAttr<BlocksAttr>()) { 4048 if (getLangOptions().getGCMode() != LangOptions::NonGC) 4049 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4050 else 4051 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4052 } 4053 4054 bool isVM = T->isVariablyModifiedType(); 4055 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4056 NewVD->hasAttr<BlocksAttr>()) 4057 getCurFunction()->setHasBranchProtectedScope(); 4058 4059 if ((isVM && NewVD->hasLinkage()) || 4060 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4061 bool SizeIsNegative; 4062 llvm::APSInt Oversized; 4063 QualType FixedTy = 4064 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4065 Oversized); 4066 4067 if (FixedTy.isNull() && T->isVariableArrayType()) { 4068 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4069 // FIXME: This won't give the correct result for 4070 // int a[10][n]; 4071 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4072 4073 if (NewVD->isFileVarDecl()) 4074 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4075 << SizeRange; 4076 else if (NewVD->getStorageClass() == SC_Static) 4077 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4078 << SizeRange; 4079 else 4080 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4081 << SizeRange; 4082 return NewVD->setInvalidDecl(); 4083 } 4084 4085 if (FixedTy.isNull()) { 4086 if (NewVD->isFileVarDecl()) 4087 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4088 else 4089 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4090 return NewVD->setInvalidDecl(); 4091 } 4092 4093 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4094 NewVD->setType(FixedTy); 4095 } 4096 4097 if (Previous.empty() && NewVD->isExternC()) { 4098 // Since we did not find anything by this name and we're declaring 4099 // an extern "C" variable, look for a non-visible extern "C" 4100 // declaration with the same name. 4101 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4102 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4103 if (Pos != LocallyScopedExternalDecls.end()) 4104 Previous.addDecl(Pos->second); 4105 } 4106 4107 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4108 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4109 << T; 4110 return NewVD->setInvalidDecl(); 4111 } 4112 4113 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4114 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4115 return NewVD->setInvalidDecl(); 4116 } 4117 4118 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4119 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4120 return NewVD->setInvalidDecl(); 4121 } 4122 4123 // Function pointers and references cannot have qualified function type, only 4124 // function pointer-to-members can do that. 4125 QualType Pointee; 4126 unsigned PtrOrRef = 0; 4127 if (const PointerType *Ptr = T->getAs<PointerType>()) 4128 Pointee = Ptr->getPointeeType(); 4129 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4130 Pointee = Ref->getPointeeType(); 4131 PtrOrRef = 1; 4132 } 4133 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4134 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4135 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4136 << PtrOrRef; 4137 return NewVD->setInvalidDecl(); 4138 } 4139 4140 if (!Previous.empty()) { 4141 Redeclaration = true; 4142 MergeVarDecl(NewVD, Previous); 4143 } 4144} 4145 4146/// \brief Data used with FindOverriddenMethod 4147struct FindOverriddenMethodData { 4148 Sema *S; 4149 CXXMethodDecl *Method; 4150}; 4151 4152/// \brief Member lookup function that determines whether a given C++ 4153/// method overrides a method in a base class, to be used with 4154/// CXXRecordDecl::lookupInBases(). 4155static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4156 CXXBasePath &Path, 4157 void *UserData) { 4158 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4159 4160 FindOverriddenMethodData *Data 4161 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4162 4163 DeclarationName Name = Data->Method->getDeclName(); 4164 4165 // FIXME: Do we care about other names here too? 4166 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4167 // We really want to find the base class destructor here. 4168 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4169 CanQualType CT = Data->S->Context.getCanonicalType(T); 4170 4171 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4172 } 4173 4174 for (Path.Decls = BaseRecord->lookup(Name); 4175 Path.Decls.first != Path.Decls.second; 4176 ++Path.Decls.first) { 4177 NamedDecl *D = *Path.Decls.first; 4178 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4179 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4180 return true; 4181 } 4182 } 4183 4184 return false; 4185} 4186 4187/// AddOverriddenMethods - See if a method overrides any in the base classes, 4188/// and if so, check that it's a valid override and remember it. 4189bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4190 // Look for virtual methods in base classes that this method might override. 4191 CXXBasePaths Paths; 4192 FindOverriddenMethodData Data; 4193 Data.Method = MD; 4194 Data.S = this; 4195 bool AddedAny = false; 4196 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4197 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4198 E = Paths.found_decls_end(); I != E; ++I) { 4199 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4200 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4201 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4202 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4203 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4204 AddedAny = true; 4205 } 4206 } 4207 } 4208 } 4209 4210 return AddedAny; 4211} 4212 4213static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4214 bool isFriendDecl) { 4215 DeclarationName Name = NewFD->getDeclName(); 4216 DeclContext *DC = NewFD->getDeclContext(); 4217 LookupResult Prev(S, Name, NewFD->getLocation(), 4218 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4219 llvm::SmallVector<unsigned, 1> MismatchedParams; 4220 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4221 TypoCorrection Correction; 4222 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4223 : diag::err_member_def_does_not_match; 4224 4225 NewFD->setInvalidDecl(); 4226 S.LookupQualifiedName(Prev, DC); 4227 assert(!Prev.isAmbiguous() && 4228 "Cannot have an ambiguity in previous-declaration lookup"); 4229 if (!Prev.empty()) { 4230 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4231 Func != FuncEnd; ++Func) { 4232 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4233 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4234 MismatchedParams)) { 4235 // Add 1 to the index so that 0 can mean the mismatch didn't 4236 // involve a parameter 4237 unsigned ParamNum = 4238 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4239 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4240 } 4241 } 4242 // If the qualified name lookup yielded nothing, try typo correction 4243 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4244 Prev.getLookupKind(), 0, 0, DC)) && 4245 Correction.getCorrection() != Name) { 4246 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4247 : diag::err_member_def_does_not_match_suggest; 4248 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4249 CDeclEnd = Correction.end(); 4250 CDecl != CDeclEnd; ++CDecl) { 4251 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4252 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4253 MismatchedParams)) { 4254 // Add 1 to the index so that 0 can mean the mismatch didn't 4255 // involve a parameter 4256 unsigned ParamNum = 4257 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4258 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4259 } 4260 } 4261 } 4262 4263 if (Correction) 4264 S.Diag(NewFD->getLocation(), DiagMsg) 4265 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4266 << FixItHint::CreateReplacement( 4267 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4268 else 4269 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4270 4271 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4272 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4273 NearMatch != NearMatchEnd; ++NearMatch) { 4274 FunctionDecl *FD = NearMatch->first; 4275 4276 if (unsigned Idx = NearMatch->second) { 4277 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4278 S.Diag(FDParam->getTypeSpecStartLoc(), 4279 diag::note_member_def_close_param_match) 4280 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4281 } else if (Correction) { 4282 S.Diag(FD->getLocation(), diag::note_previous_decl) 4283 << Correction.getQuoted(S.getLangOptions()); 4284 } else 4285 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4286 } 4287} 4288 4289NamedDecl* 4290Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4291 QualType R, TypeSourceInfo *TInfo, 4292 LookupResult &Previous, 4293 MultiTemplateParamsArg TemplateParamLists, 4294 bool IsFunctionDefinition, bool &Redeclaration, 4295 bool &AddToScope) { 4296 assert(R.getTypePtr()->isFunctionType()); 4297 4298 // TODO: consider using NameInfo for diagnostic. 4299 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4300 DeclarationName Name = NameInfo.getName(); 4301 FunctionDecl::StorageClass SC = SC_None; 4302 switch (D.getDeclSpec().getStorageClassSpec()) { 4303 default: assert(0 && "Unknown storage class!"); 4304 case DeclSpec::SCS_auto: 4305 case DeclSpec::SCS_register: 4306 case DeclSpec::SCS_mutable: 4307 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4308 diag::err_typecheck_sclass_func); 4309 D.setInvalidType(); 4310 break; 4311 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4312 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4313 case DeclSpec::SCS_static: { 4314 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4315 // C99 6.7.1p5: 4316 // The declaration of an identifier for a function that has 4317 // block scope shall have no explicit storage-class specifier 4318 // other than extern 4319 // See also (C++ [dcl.stc]p4). 4320 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4321 diag::err_static_block_func); 4322 SC = SC_None; 4323 } else 4324 SC = SC_Static; 4325 break; 4326 } 4327 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4328 } 4329 4330 if (D.getDeclSpec().isThreadSpecified()) 4331 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4332 4333 // Do not allow returning a objc interface by-value. 4334 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4335 Diag(D.getIdentifierLoc(), 4336 diag::err_object_cannot_be_passed_returned_by_value) << 0 4337 << R->getAs<FunctionType>()->getResultType() 4338 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4339 4340 QualType T = R->getAs<FunctionType>()->getResultType(); 4341 T = Context.getObjCObjectPointerType(T); 4342 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4343 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4344 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4345 FPT->getNumArgs(), EPI); 4346 } 4347 else if (isa<FunctionNoProtoType>(R)) 4348 R = Context.getFunctionNoProtoType(T); 4349 } 4350 4351 FunctionDecl *NewFD; 4352 bool isInline = D.getDeclSpec().isInlineSpecified(); 4353 bool isFriend = false; 4354 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4355 FunctionDecl::StorageClass SCAsWritten 4356 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4357 FunctionTemplateDecl *FunctionTemplate = 0; 4358 bool isExplicitSpecialization = false; 4359 bool isFunctionTemplateSpecialization = false; 4360 bool isDependentClassScopeExplicitSpecialization = false; 4361 4362 if (!getLangOptions().CPlusPlus) { 4363 // Determine whether the function was written with a 4364 // prototype. This true when: 4365 // - there is a prototype in the declarator, or 4366 // - the type R of the function is some kind of typedef or other reference 4367 // to a type name (which eventually refers to a function type). 4368 bool HasPrototype = 4369 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4370 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4371 4372 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4373 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4374 HasPrototype); 4375 if (D.isInvalidType()) 4376 NewFD->setInvalidDecl(); 4377 4378 // Set the lexical context. 4379 NewFD->setLexicalDeclContext(CurContext); 4380 // Filter out previous declarations that don't match the scope. 4381 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4382 /*ExplicitInstantiationOrSpecialization=*/false); 4383 } else { 4384 isFriend = D.getDeclSpec().isFriendSpecified(); 4385 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4386 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4387 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4388 bool isVirtualOkay = false; 4389 4390 // Check that the return type is not an abstract class type. 4391 // For record types, this is done by the AbstractClassUsageDiagnoser once 4392 // the class has been completely parsed. 4393 if (!DC->isRecord() && 4394 RequireNonAbstractType(D.getIdentifierLoc(), 4395 R->getAs<FunctionType>()->getResultType(), 4396 diag::err_abstract_type_in_decl, 4397 AbstractReturnType)) 4398 D.setInvalidType(); 4399 4400 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4401 // This is a C++ constructor declaration. 4402 assert(DC->isRecord() && 4403 "Constructors can only be declared in a member context"); 4404 4405 R = CheckConstructorDeclarator(D, R, SC); 4406 4407 // Create the new declaration 4408 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4409 Context, 4410 cast<CXXRecordDecl>(DC), 4411 D.getSourceRange().getBegin(), 4412 NameInfo, R, TInfo, 4413 isExplicit, isInline, 4414 /*isImplicitlyDeclared=*/false, 4415 isConstexpr); 4416 4417 NewFD = NewCD; 4418 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4419 // This is a C++ destructor declaration. 4420 if (DC->isRecord()) { 4421 R = CheckDestructorDeclarator(D, R, SC); 4422 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4423 4424 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4425 D.getSourceRange().getBegin(), 4426 NameInfo, R, TInfo, 4427 isInline, 4428 /*isImplicitlyDeclared=*/false); 4429 NewFD = NewDD; 4430 isVirtualOkay = true; 4431 4432 // If the class is complete, then we now create the implicit exception 4433 // specification. If the class is incomplete or dependent, we can't do 4434 // it yet. 4435 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4436 Record->getDefinition() && !Record->isBeingDefined() && 4437 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4438 AdjustDestructorExceptionSpec(Record, NewDD); 4439 } 4440 4441 } else { 4442 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4443 4444 // Create a FunctionDecl to satisfy the function definition parsing 4445 // code path. 4446 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4447 D.getIdentifierLoc(), Name, R, TInfo, 4448 SC, SCAsWritten, isInline, 4449 /*hasPrototype=*/true, isConstexpr); 4450 D.setInvalidType(); 4451 } 4452 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4453 if (!DC->isRecord()) { 4454 Diag(D.getIdentifierLoc(), 4455 diag::err_conv_function_not_member); 4456 return 0; 4457 } 4458 4459 CheckConversionDeclarator(D, R, SC); 4460 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4461 D.getSourceRange().getBegin(), 4462 NameInfo, R, TInfo, 4463 isInline, isExplicit, isConstexpr, 4464 SourceLocation()); 4465 4466 isVirtualOkay = true; 4467 } else if (DC->isRecord()) { 4468 // If the name of the function is the same as the name of the record, 4469 // then this must be an invalid constructor that has a return type. 4470 // (The parser checks for a return type and makes the declarator a 4471 // constructor if it has no return type). 4472 if (Name.getAsIdentifierInfo() && 4473 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4474 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4475 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4476 << SourceRange(D.getIdentifierLoc()); 4477 return 0; 4478 } 4479 4480 bool isStatic = SC == SC_Static; 4481 4482 // [class.free]p1: 4483 // Any allocation function for a class T is a static member 4484 // (even if not explicitly declared static). 4485 if (Name.getCXXOverloadedOperator() == OO_New || 4486 Name.getCXXOverloadedOperator() == OO_Array_New) 4487 isStatic = true; 4488 4489 // [class.free]p6 Any deallocation function for a class X is a static member 4490 // (even if not explicitly declared static). 4491 if (Name.getCXXOverloadedOperator() == OO_Delete || 4492 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4493 isStatic = true; 4494 4495 // This is a C++ method declaration. 4496 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4497 Context, cast<CXXRecordDecl>(DC), 4498 D.getSourceRange().getBegin(), 4499 NameInfo, R, TInfo, 4500 isStatic, SCAsWritten, isInline, 4501 isConstexpr, 4502 SourceLocation()); 4503 NewFD = NewMD; 4504 4505 isVirtualOkay = !isStatic; 4506 } else { 4507 // Determine whether the function was written with a 4508 // prototype. This true when: 4509 // - we're in C++ (where every function has a prototype), 4510 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4511 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4512 true/*HasPrototype*/, isConstexpr); 4513 } 4514 4515 if (isFriend && !isInline && IsFunctionDefinition) { 4516 // C++ [class.friend]p5 4517 // A function can be defined in a friend declaration of a 4518 // class . . . . Such a function is implicitly inline. 4519 NewFD->setImplicitlyInline(); 4520 } 4521 4522 SetNestedNameSpecifier(NewFD, D); 4523 isExplicitSpecialization = false; 4524 isFunctionTemplateSpecialization = false; 4525 if (D.isInvalidType()) 4526 NewFD->setInvalidDecl(); 4527 4528 // Set the lexical context. If the declarator has a C++ 4529 // scope specifier, or is the object of a friend declaration, the 4530 // lexical context will be different from the semantic context. 4531 NewFD->setLexicalDeclContext(CurContext); 4532 4533 // Match up the template parameter lists with the scope specifier, then 4534 // determine whether we have a template or a template specialization. 4535 bool Invalid = false; 4536 if (TemplateParameterList *TemplateParams 4537 = MatchTemplateParametersToScopeSpecifier( 4538 D.getDeclSpec().getSourceRange().getBegin(), 4539 D.getIdentifierLoc(), 4540 D.getCXXScopeSpec(), 4541 TemplateParamLists.get(), 4542 TemplateParamLists.size(), 4543 isFriend, 4544 isExplicitSpecialization, 4545 Invalid)) { 4546 if (TemplateParams->size() > 0) { 4547 // This is a function template 4548 4549 // Check that we can declare a template here. 4550 if (CheckTemplateDeclScope(S, TemplateParams)) 4551 return 0; 4552 4553 // A destructor cannot be a template. 4554 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4555 Diag(NewFD->getLocation(), diag::err_destructor_template); 4556 return 0; 4557 } 4558 4559 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4560 NewFD->getLocation(), 4561 Name, TemplateParams, 4562 NewFD); 4563 FunctionTemplate->setLexicalDeclContext(CurContext); 4564 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4565 4566 // For source fidelity, store the other template param lists. 4567 if (TemplateParamLists.size() > 1) { 4568 NewFD->setTemplateParameterListsInfo(Context, 4569 TemplateParamLists.size() - 1, 4570 TemplateParamLists.release()); 4571 } 4572 } else { 4573 // This is a function template specialization. 4574 isFunctionTemplateSpecialization = true; 4575 // For source fidelity, store all the template param lists. 4576 NewFD->setTemplateParameterListsInfo(Context, 4577 TemplateParamLists.size(), 4578 TemplateParamLists.release()); 4579 4580 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4581 if (isFriend) { 4582 // We want to remove the "template<>", found here. 4583 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4584 4585 // If we remove the template<> and the name is not a 4586 // template-id, we're actually silently creating a problem: 4587 // the friend declaration will refer to an untemplated decl, 4588 // and clearly the user wants a template specialization. So 4589 // we need to insert '<>' after the name. 4590 SourceLocation InsertLoc; 4591 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4592 InsertLoc = D.getName().getSourceRange().getEnd(); 4593 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4594 } 4595 4596 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4597 << Name << RemoveRange 4598 << FixItHint::CreateRemoval(RemoveRange) 4599 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4600 } 4601 } 4602 } 4603 else { 4604 // All template param lists were matched against the scope specifier: 4605 // this is NOT (an explicit specialization of) a template. 4606 if (TemplateParamLists.size() > 0) 4607 // For source fidelity, store all the template param lists. 4608 NewFD->setTemplateParameterListsInfo(Context, 4609 TemplateParamLists.size(), 4610 TemplateParamLists.release()); 4611 } 4612 4613 if (Invalid) { 4614 NewFD->setInvalidDecl(); 4615 if (FunctionTemplate) 4616 FunctionTemplate->setInvalidDecl(); 4617 } 4618 4619 // C++ [dcl.fct.spec]p5: 4620 // The virtual specifier shall only be used in declarations of 4621 // nonstatic class member functions that appear within a 4622 // member-specification of a class declaration; see 10.3. 4623 // 4624 if (isVirtual && !NewFD->isInvalidDecl()) { 4625 if (!isVirtualOkay) { 4626 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4627 diag::err_virtual_non_function); 4628 } else if (!CurContext->isRecord()) { 4629 // 'virtual' was specified outside of the class. 4630 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4631 diag::err_virtual_out_of_class) 4632 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4633 } else if (NewFD->getDescribedFunctionTemplate()) { 4634 // C++ [temp.mem]p3: 4635 // A member function template shall not be virtual. 4636 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4637 diag::err_virtual_member_function_template) 4638 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4639 } else { 4640 // Okay: Add virtual to the method. 4641 NewFD->setVirtualAsWritten(true); 4642 } 4643 } 4644 4645 // C++ [dcl.fct.spec]p3: 4646 // The inline specifier shall not appear on a block scope function declaration. 4647 if (isInline && !NewFD->isInvalidDecl()) { 4648 if (CurContext->isFunctionOrMethod()) { 4649 // 'inline' is not allowed on block scope function declaration. 4650 Diag(D.getDeclSpec().getInlineSpecLoc(), 4651 diag::err_inline_declaration_block_scope) << Name 4652 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4653 } 4654 } 4655 4656 // C++ [dcl.fct.spec]p6: 4657 // The explicit specifier shall be used only in the declaration of a 4658 // constructor or conversion function within its class definition; see 12.3.1 4659 // and 12.3.2. 4660 if (isExplicit && !NewFD->isInvalidDecl()) { 4661 if (!CurContext->isRecord()) { 4662 // 'explicit' was specified outside of the class. 4663 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4664 diag::err_explicit_out_of_class) 4665 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4666 } else if (!isa<CXXConstructorDecl>(NewFD) && 4667 !isa<CXXConversionDecl>(NewFD)) { 4668 // 'explicit' was specified on a function that wasn't a constructor 4669 // or conversion function. 4670 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4671 diag::err_explicit_non_ctor_or_conv_function) 4672 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4673 } 4674 } 4675 4676 if (isConstexpr) { 4677 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4678 // are implicitly inline. 4679 NewFD->setImplicitlyInline(); 4680 4681 // FIXME: If this is a redeclaration, check the original declaration was 4682 // marked constepr. 4683 4684 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4685 // be either constructors or to return a literal type. Therefore, 4686 // destructors cannot be declared constexpr. 4687 if (isa<CXXDestructorDecl>(NewFD)) 4688 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4689 diag::err_constexpr_dtor); 4690 } 4691 4692 // If __module_private__ was specified, mark the function accordingly. 4693 if (D.getDeclSpec().isModulePrivateSpecified()) { 4694 NewFD->setModulePrivate(); 4695 if (FunctionTemplate) 4696 FunctionTemplate->setModulePrivate(); 4697 } 4698 4699 // Filter out previous declarations that don't match the scope. 4700 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4701 isExplicitSpecialization || 4702 isFunctionTemplateSpecialization); 4703 4704 if (isFriend) { 4705 // For now, claim that the objects have no previous declaration. 4706 if (FunctionTemplate) { 4707 FunctionTemplate->setObjectOfFriendDecl(false); 4708 FunctionTemplate->setAccess(AS_public); 4709 } 4710 NewFD->setObjectOfFriendDecl(false); 4711 NewFD->setAccess(AS_public); 4712 } 4713 4714 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4715 // A method is implicitly inline if it's defined in its class 4716 // definition. 4717 NewFD->setImplicitlyInline(); 4718 } 4719 4720 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4721 !CurContext->isRecord()) { 4722 // C++ [class.static]p1: 4723 // A data or function member of a class may be declared static 4724 // in a class definition, in which case it is a static member of 4725 // the class. 4726 4727 // Complain about the 'static' specifier if it's on an out-of-line 4728 // member function definition. 4729 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4730 diag::err_static_out_of_line) 4731 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4732 } 4733 } 4734 4735 // Handle GNU asm-label extension (encoded as an attribute). 4736 if (Expr *E = (Expr*) D.getAsmLabel()) { 4737 // The parser guarantees this is a string. 4738 StringLiteral *SE = cast<StringLiteral>(E); 4739 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4740 SE->getString())); 4741 } 4742 4743 // Copy the parameter declarations from the declarator D to the function 4744 // declaration NewFD, if they are available. First scavenge them into Params. 4745 SmallVector<ParmVarDecl*, 16> Params; 4746 if (D.isFunctionDeclarator()) { 4747 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4748 4749 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4750 // function that takes no arguments, not a function that takes a 4751 // single void argument. 4752 // We let through "const void" here because Sema::GetTypeForDeclarator 4753 // already checks for that case. 4754 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4755 FTI.ArgInfo[0].Param && 4756 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4757 // Empty arg list, don't push any params. 4758 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4759 4760 // In C++, the empty parameter-type-list must be spelled "void"; a 4761 // typedef of void is not permitted. 4762 if (getLangOptions().CPlusPlus && 4763 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4764 bool IsTypeAlias = false; 4765 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4766 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4767 else if (const TemplateSpecializationType *TST = 4768 Param->getType()->getAs<TemplateSpecializationType>()) 4769 IsTypeAlias = TST->isTypeAlias(); 4770 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4771 << IsTypeAlias; 4772 } 4773 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4774 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4775 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4776 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4777 Param->setDeclContext(NewFD); 4778 Params.push_back(Param); 4779 4780 if (Param->isInvalidDecl()) 4781 NewFD->setInvalidDecl(); 4782 } 4783 } 4784 4785 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4786 // When we're declaring a function with a typedef, typeof, etc as in the 4787 // following example, we'll need to synthesize (unnamed) 4788 // parameters for use in the declaration. 4789 // 4790 // @code 4791 // typedef void fn(int); 4792 // fn f; 4793 // @endcode 4794 4795 // Synthesize a parameter for each argument type. 4796 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4797 AE = FT->arg_type_end(); AI != AE; ++AI) { 4798 ParmVarDecl *Param = 4799 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4800 Param->setScopeInfo(0, Params.size()); 4801 Params.push_back(Param); 4802 } 4803 } else { 4804 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4805 "Should not need args for typedef of non-prototype fn"); 4806 } 4807 // Finally, we know we have the right number of parameters, install them. 4808 NewFD->setParams(Params.data(), Params.size()); 4809 4810 // Process the non-inheritable attributes on this declaration. 4811 ProcessDeclAttributes(S, NewFD, D, 4812 /*NonInheritable=*/true, /*Inheritable=*/false); 4813 4814 if (!getLangOptions().CPlusPlus) { 4815 // Perform semantic checking on the function declaration. 4816 bool isExplicitSpecialization=false; 4817 if (!NewFD->isInvalidDecl()) { 4818 if (NewFD->getResultType()->isVariablyModifiedType()) { 4819 // Functions returning a variably modified type violate C99 6.7.5.2p2 4820 // because all functions have linkage. 4821 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4822 NewFD->setInvalidDecl(); 4823 } else { 4824 if (NewFD->isMain()) 4825 CheckMain(NewFD, D.getDeclSpec()); 4826 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4827 Redeclaration); 4828 } 4829 } 4830 assert((NewFD->isInvalidDecl() || !Redeclaration || 4831 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4832 "previous declaration set still overloaded"); 4833 } else { 4834 // If the declarator is a template-id, translate the parser's template 4835 // argument list into our AST format. 4836 bool HasExplicitTemplateArgs = false; 4837 TemplateArgumentListInfo TemplateArgs; 4838 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4839 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4840 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4841 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4842 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4843 TemplateId->getTemplateArgs(), 4844 TemplateId->NumArgs); 4845 translateTemplateArguments(TemplateArgsPtr, 4846 TemplateArgs); 4847 TemplateArgsPtr.release(); 4848 4849 HasExplicitTemplateArgs = true; 4850 4851 if (NewFD->isInvalidDecl()) { 4852 HasExplicitTemplateArgs = false; 4853 } else if (FunctionTemplate) { 4854 // Function template with explicit template arguments. 4855 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4856 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4857 4858 HasExplicitTemplateArgs = false; 4859 } else if (!isFunctionTemplateSpecialization && 4860 !D.getDeclSpec().isFriendSpecified()) { 4861 // We have encountered something that the user meant to be a 4862 // specialization (because it has explicitly-specified template 4863 // arguments) but that was not introduced with a "template<>" (or had 4864 // too few of them). 4865 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4866 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4867 << FixItHint::CreateInsertion( 4868 D.getDeclSpec().getSourceRange().getBegin(), 4869 "template<> "); 4870 isFunctionTemplateSpecialization = true; 4871 } else { 4872 // "friend void foo<>(int);" is an implicit specialization decl. 4873 isFunctionTemplateSpecialization = true; 4874 } 4875 } else if (isFriend && isFunctionTemplateSpecialization) { 4876 // This combination is only possible in a recovery case; the user 4877 // wrote something like: 4878 // template <> friend void foo(int); 4879 // which we're recovering from as if the user had written: 4880 // friend void foo<>(int); 4881 // Go ahead and fake up a template id. 4882 HasExplicitTemplateArgs = true; 4883 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4884 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4885 } 4886 4887 // If it's a friend (and only if it's a friend), it's possible 4888 // that either the specialized function type or the specialized 4889 // template is dependent, and therefore matching will fail. In 4890 // this case, don't check the specialization yet. 4891 if (isFunctionTemplateSpecialization && isFriend && 4892 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4893 assert(HasExplicitTemplateArgs && 4894 "friend function specialization without template args"); 4895 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4896 Previous)) 4897 NewFD->setInvalidDecl(); 4898 } else if (isFunctionTemplateSpecialization) { 4899 if (CurContext->isDependentContext() && CurContext->isRecord() 4900 && !isFriend) { 4901 isDependentClassScopeExplicitSpecialization = true; 4902 Diag(NewFD->getLocation(), getLangOptions().Microsoft ? 4903 diag::ext_function_specialization_in_class : 4904 diag::err_function_specialization_in_class) 4905 << NewFD->getDeclName(); 4906 } else if (CheckFunctionTemplateSpecialization(NewFD, 4907 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4908 Previous)) 4909 NewFD->setInvalidDecl(); 4910 4911 // C++ [dcl.stc]p1: 4912 // A storage-class-specifier shall not be specified in an explicit 4913 // specialization (14.7.3) 4914 if (SC != SC_None) { 4915 if (SC != NewFD->getStorageClass()) 4916 Diag(NewFD->getLocation(), 4917 diag::err_explicit_specialization_inconsistent_storage_class) 4918 << SC 4919 << FixItHint::CreateRemoval( 4920 D.getDeclSpec().getStorageClassSpecLoc()); 4921 4922 else 4923 Diag(NewFD->getLocation(), 4924 diag::ext_explicit_specialization_storage_class) 4925 << FixItHint::CreateRemoval( 4926 D.getDeclSpec().getStorageClassSpecLoc()); 4927 } 4928 4929 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4930 if (CheckMemberSpecialization(NewFD, Previous)) 4931 NewFD->setInvalidDecl(); 4932 } 4933 4934 // Perform semantic checking on the function declaration. 4935 if (!isDependentClassScopeExplicitSpecialization) { 4936 if (NewFD->isInvalidDecl()) { 4937 // If this is a class member, mark the class invalid immediately. 4938 // This avoids some consistency errors later. 4939 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 4940 methodDecl->getParent()->setInvalidDecl(); 4941 } else { 4942 if (NewFD->isMain()) 4943 CheckMain(NewFD, D.getDeclSpec()); 4944 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4945 Redeclaration); 4946 } 4947 } 4948 4949 assert((NewFD->isInvalidDecl() || !Redeclaration || 4950 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4951 "previous declaration set still overloaded"); 4952 4953 NamedDecl *PrincipalDecl = (FunctionTemplate 4954 ? cast<NamedDecl>(FunctionTemplate) 4955 : NewFD); 4956 4957 if (isFriend && Redeclaration) { 4958 AccessSpecifier Access = AS_public; 4959 if (!NewFD->isInvalidDecl()) 4960 Access = NewFD->getPreviousDeclaration()->getAccess(); 4961 4962 NewFD->setAccess(Access); 4963 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4964 4965 PrincipalDecl->setObjectOfFriendDecl(true); 4966 } 4967 4968 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4969 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4970 PrincipalDecl->setNonMemberOperator(); 4971 4972 // If we have a function template, check the template parameter 4973 // list. This will check and merge default template arguments. 4974 if (FunctionTemplate) { 4975 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4976 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4977 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4978 D.getDeclSpec().isFriendSpecified() 4979 ? (IsFunctionDefinition 4980 ? TPC_FriendFunctionTemplateDefinition 4981 : TPC_FriendFunctionTemplate) 4982 : (D.getCXXScopeSpec().isSet() && 4983 DC && DC->isRecord() && 4984 DC->isDependentContext()) 4985 ? TPC_ClassTemplateMember 4986 : TPC_FunctionTemplate); 4987 } 4988 4989 if (NewFD->isInvalidDecl()) { 4990 // Ignore all the rest of this. 4991 } else if (!Redeclaration) { 4992 // Fake up an access specifier if it's supposed to be a class member. 4993 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4994 NewFD->setAccess(AS_public); 4995 4996 // Qualified decls generally require a previous declaration. 4997 if (D.getCXXScopeSpec().isSet()) { 4998 // ...with the major exception of templated-scope or 4999 // dependent-scope friend declarations. 5000 5001 // TODO: we currently also suppress this check in dependent 5002 // contexts because (1) the parameter depth will be off when 5003 // matching friend templates and (2) we might actually be 5004 // selecting a friend based on a dependent factor. But there 5005 // are situations where these conditions don't apply and we 5006 // can actually do this check immediately. 5007 if (isFriend && 5008 (TemplateParamLists.size() || 5009 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5010 CurContext->isDependentContext())) { 5011 // ignore these 5012 } else { 5013 // The user tried to provide an out-of-line definition for a 5014 // function that is a member of a class or namespace, but there 5015 // was no such member function declared (C++ [class.mfct]p2, 5016 // C++ [namespace.memdef]p2). For example: 5017 // 5018 // class X { 5019 // void f() const; 5020 // }; 5021 // 5022 // void X::f() { } // ill-formed 5023 // 5024 // Complain about this problem, and attempt to suggest close 5025 // matches (e.g., those that differ only in cv-qualifiers and 5026 // whether the parameter types are references). 5027 5028 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5029 } 5030 5031 // Unqualified local friend declarations are required to resolve 5032 // to something. 5033 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5034 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5035 } 5036 5037 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5038 !isFriend && !isFunctionTemplateSpecialization && 5039 !isExplicitSpecialization) { 5040 // An out-of-line member function declaration must also be a 5041 // definition (C++ [dcl.meaning]p1). 5042 // Note that this is not the case for explicit specializations of 5043 // function templates or member functions of class templates, per 5044 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5045 // for compatibility with old SWIG code which likes to generate them. 5046 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5047 << D.getCXXScopeSpec().getRange(); 5048 } 5049 } 5050 5051 5052 // Handle attributes. We need to have merged decls when handling attributes 5053 // (for example to check for conflicts, etc). 5054 // FIXME: This needs to happen before we merge declarations. Then, 5055 // let attribute merging cope with attribute conflicts. 5056 ProcessDeclAttributes(S, NewFD, D, 5057 /*NonInheritable=*/false, /*Inheritable=*/true); 5058 5059 // attributes declared post-definition are currently ignored 5060 // FIXME: This should happen during attribute merging 5061 if (Redeclaration && Previous.isSingleResult()) { 5062 const FunctionDecl *Def; 5063 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5064 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5065 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5066 Diag(Def->getLocation(), diag::note_previous_definition); 5067 } 5068 } 5069 5070 AddKnownFunctionAttributes(NewFD); 5071 5072 if (NewFD->hasAttr<OverloadableAttr>() && 5073 !NewFD->getType()->getAs<FunctionProtoType>()) { 5074 Diag(NewFD->getLocation(), 5075 diag::err_attribute_overloadable_no_prototype) 5076 << NewFD; 5077 5078 // Turn this into a variadic function with no parameters. 5079 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5080 FunctionProtoType::ExtProtoInfo EPI; 5081 EPI.Variadic = true; 5082 EPI.ExtInfo = FT->getExtInfo(); 5083 5084 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5085 NewFD->setType(R); 5086 } 5087 5088 // If there's a #pragma GCC visibility in scope, and this isn't a class 5089 // member, set the visibility of this function. 5090 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5091 AddPushedVisibilityAttribute(NewFD); 5092 5093 // If this is a locally-scoped extern C function, update the 5094 // map of such names. 5095 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5096 && !NewFD->isInvalidDecl()) 5097 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5098 5099 // Set this FunctionDecl's range up to the right paren. 5100 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5101 5102 if (getLangOptions().CPlusPlus) { 5103 if (FunctionTemplate) { 5104 if (NewFD->isInvalidDecl()) 5105 FunctionTemplate->setInvalidDecl(); 5106 return FunctionTemplate; 5107 } 5108 } 5109 5110 MarkUnusedFileScopedDecl(NewFD); 5111 5112 if (getLangOptions().CUDA) 5113 if (IdentifierInfo *II = NewFD->getIdentifier()) 5114 if (!NewFD->isInvalidDecl() && 5115 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5116 if (II->isStr("cudaConfigureCall")) { 5117 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5118 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5119 5120 Context.setcudaConfigureCallDecl(NewFD); 5121 } 5122 } 5123 5124 // Here we have an function template explicit specialization at class scope. 5125 // The actually specialization will be postponed to template instatiation 5126 // time via the ClassScopeFunctionSpecializationDecl node. 5127 if (isDependentClassScopeExplicitSpecialization) { 5128 ClassScopeFunctionSpecializationDecl *NewSpec = 5129 ClassScopeFunctionSpecializationDecl::Create( 5130 Context, CurContext, SourceLocation(), 5131 cast<CXXMethodDecl>(NewFD)); 5132 CurContext->addDecl(NewSpec); 5133 AddToScope = false; 5134 } 5135 5136 return NewFD; 5137} 5138 5139/// \brief Perform semantic checking of a new function declaration. 5140/// 5141/// Performs semantic analysis of the new function declaration 5142/// NewFD. This routine performs all semantic checking that does not 5143/// require the actual declarator involved in the declaration, and is 5144/// used both for the declaration of functions as they are parsed 5145/// (called via ActOnDeclarator) and for the declaration of functions 5146/// that have been instantiated via C++ template instantiation (called 5147/// via InstantiateDecl). 5148/// 5149/// \param IsExplicitSpecialiation whether this new function declaration is 5150/// an explicit specialization of the previous declaration. 5151/// 5152/// This sets NewFD->isInvalidDecl() to true if there was an error. 5153void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5154 LookupResult &Previous, 5155 bool IsExplicitSpecialization, 5156 bool &Redeclaration) { 5157 assert(!NewFD->getResultType()->isVariablyModifiedType() 5158 && "Variably modified return types are not handled here"); 5159 5160 // Check for a previous declaration of this name. 5161 if (Previous.empty() && NewFD->isExternC()) { 5162 // Since we did not find anything by this name and we're declaring 5163 // an extern "C" function, look for a non-visible extern "C" 5164 // declaration with the same name. 5165 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5166 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5167 if (Pos != LocallyScopedExternalDecls.end()) 5168 Previous.addDecl(Pos->second); 5169 } 5170 5171 // Merge or overload the declaration with an existing declaration of 5172 // the same name, if appropriate. 5173 if (!Previous.empty()) { 5174 // Determine whether NewFD is an overload of PrevDecl or 5175 // a declaration that requires merging. If it's an overload, 5176 // there's no more work to do here; we'll just add the new 5177 // function to the scope. 5178 5179 NamedDecl *OldDecl = 0; 5180 if (!AllowOverloadingOfFunction(Previous, Context)) { 5181 Redeclaration = true; 5182 OldDecl = Previous.getFoundDecl(); 5183 } else { 5184 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5185 /*NewIsUsingDecl*/ false)) { 5186 case Ovl_Match: 5187 Redeclaration = true; 5188 break; 5189 5190 case Ovl_NonFunction: 5191 Redeclaration = true; 5192 break; 5193 5194 case Ovl_Overload: 5195 Redeclaration = false; 5196 break; 5197 } 5198 5199 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5200 // If a function name is overloadable in C, then every function 5201 // with that name must be marked "overloadable". 5202 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5203 << Redeclaration << NewFD; 5204 NamedDecl *OverloadedDecl = 0; 5205 if (Redeclaration) 5206 OverloadedDecl = OldDecl; 5207 else if (!Previous.empty()) 5208 OverloadedDecl = Previous.getRepresentativeDecl(); 5209 if (OverloadedDecl) 5210 Diag(OverloadedDecl->getLocation(), 5211 diag::note_attribute_overloadable_prev_overload); 5212 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5213 Context)); 5214 } 5215 } 5216 5217 if (Redeclaration) { 5218 // NewFD and OldDecl represent declarations that need to be 5219 // merged. 5220 if (MergeFunctionDecl(NewFD, OldDecl)) 5221 return NewFD->setInvalidDecl(); 5222 5223 Previous.clear(); 5224 Previous.addDecl(OldDecl); 5225 5226 if (FunctionTemplateDecl *OldTemplateDecl 5227 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5228 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5229 FunctionTemplateDecl *NewTemplateDecl 5230 = NewFD->getDescribedFunctionTemplate(); 5231 assert(NewTemplateDecl && "Template/non-template mismatch"); 5232 if (CXXMethodDecl *Method 5233 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5234 Method->setAccess(OldTemplateDecl->getAccess()); 5235 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5236 } 5237 5238 // If this is an explicit specialization of a member that is a function 5239 // template, mark it as a member specialization. 5240 if (IsExplicitSpecialization && 5241 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5242 NewTemplateDecl->setMemberSpecialization(); 5243 assert(OldTemplateDecl->isMemberSpecialization()); 5244 } 5245 } else { 5246 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5247 NewFD->setAccess(OldDecl->getAccess()); 5248 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5249 } 5250 } 5251 } 5252 5253 // Semantic checking for this function declaration (in isolation). 5254 if (getLangOptions().CPlusPlus) { 5255 // C++-specific checks. 5256 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5257 CheckConstructor(Constructor); 5258 } else if (CXXDestructorDecl *Destructor = 5259 dyn_cast<CXXDestructorDecl>(NewFD)) { 5260 CXXRecordDecl *Record = Destructor->getParent(); 5261 QualType ClassType = Context.getTypeDeclType(Record); 5262 5263 // FIXME: Shouldn't we be able to perform this check even when the class 5264 // type is dependent? Both gcc and edg can handle that. 5265 if (!ClassType->isDependentType()) { 5266 DeclarationName Name 5267 = Context.DeclarationNames.getCXXDestructorName( 5268 Context.getCanonicalType(ClassType)); 5269 if (NewFD->getDeclName() != Name) { 5270 Diag(NewFD->getLocation(), diag::err_destructor_name); 5271 return NewFD->setInvalidDecl(); 5272 } 5273 } 5274 } else if (CXXConversionDecl *Conversion 5275 = dyn_cast<CXXConversionDecl>(NewFD)) { 5276 ActOnConversionDeclarator(Conversion); 5277 } 5278 5279 // Find any virtual functions that this function overrides. 5280 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5281 if (!Method->isFunctionTemplateSpecialization() && 5282 !Method->getDescribedFunctionTemplate()) { 5283 if (AddOverriddenMethods(Method->getParent(), Method)) { 5284 // If the function was marked as "static", we have a problem. 5285 if (NewFD->getStorageClass() == SC_Static) { 5286 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5287 << NewFD->getDeclName(); 5288 for (CXXMethodDecl::method_iterator 5289 Overridden = Method->begin_overridden_methods(), 5290 OverriddenEnd = Method->end_overridden_methods(); 5291 Overridden != OverriddenEnd; 5292 ++Overridden) { 5293 Diag((*Overridden)->getLocation(), 5294 diag::note_overridden_virtual_function); 5295 } 5296 } 5297 } 5298 } 5299 } 5300 5301 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5302 if (NewFD->isOverloadedOperator() && 5303 CheckOverloadedOperatorDeclaration(NewFD)) 5304 return NewFD->setInvalidDecl(); 5305 5306 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5307 if (NewFD->getLiteralIdentifier() && 5308 CheckLiteralOperatorDeclaration(NewFD)) 5309 return NewFD->setInvalidDecl(); 5310 5311 // In C++, check default arguments now that we have merged decls. Unless 5312 // the lexical context is the class, because in this case this is done 5313 // during delayed parsing anyway. 5314 if (!CurContext->isRecord()) 5315 CheckCXXDefaultArguments(NewFD); 5316 5317 // If this function declares a builtin function, check the type of this 5318 // declaration against the expected type for the builtin. 5319 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5320 ASTContext::GetBuiltinTypeError Error; 5321 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5322 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5323 // The type of this function differs from the type of the builtin, 5324 // so forget about the builtin entirely. 5325 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5326 } 5327 } 5328 } 5329} 5330 5331void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5332 // C++ [basic.start.main]p3: A program that declares main to be inline 5333 // or static is ill-formed. 5334 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5335 // shall not appear in a declaration of main. 5336 // static main is not an error under C99, but we should warn about it. 5337 if (FD->getStorageClass() == SC_Static) 5338 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5339 ? diag::err_static_main : diag::warn_static_main) 5340 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5341 if (FD->isInlineSpecified()) 5342 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5343 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5344 5345 QualType T = FD->getType(); 5346 assert(T->isFunctionType() && "function decl is not of function type"); 5347 const FunctionType* FT = T->getAs<FunctionType>(); 5348 5349 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5350 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5351 FD->setInvalidDecl(true); 5352 } 5353 5354 // Treat protoless main() as nullary. 5355 if (isa<FunctionNoProtoType>(FT)) return; 5356 5357 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5358 unsigned nparams = FTP->getNumArgs(); 5359 assert(FD->getNumParams() == nparams); 5360 5361 bool HasExtraParameters = (nparams > 3); 5362 5363 // Darwin passes an undocumented fourth argument of type char**. If 5364 // other platforms start sprouting these, the logic below will start 5365 // getting shifty. 5366 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5367 HasExtraParameters = false; 5368 5369 if (HasExtraParameters) { 5370 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5371 FD->setInvalidDecl(true); 5372 nparams = 3; 5373 } 5374 5375 // FIXME: a lot of the following diagnostics would be improved 5376 // if we had some location information about types. 5377 5378 QualType CharPP = 5379 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5380 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5381 5382 for (unsigned i = 0; i < nparams; ++i) { 5383 QualType AT = FTP->getArgType(i); 5384 5385 bool mismatch = true; 5386 5387 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5388 mismatch = false; 5389 else if (Expected[i] == CharPP) { 5390 // As an extension, the following forms are okay: 5391 // char const ** 5392 // char const * const * 5393 // char * const * 5394 5395 QualifierCollector qs; 5396 const PointerType* PT; 5397 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5398 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5399 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5400 qs.removeConst(); 5401 mismatch = !qs.empty(); 5402 } 5403 } 5404 5405 if (mismatch) { 5406 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5407 // TODO: suggest replacing given type with expected type 5408 FD->setInvalidDecl(true); 5409 } 5410 } 5411 5412 if (nparams == 1 && !FD->isInvalidDecl()) { 5413 Diag(FD->getLocation(), diag::warn_main_one_arg); 5414 } 5415 5416 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5417 Diag(FD->getLocation(), diag::err_main_template_decl); 5418 FD->setInvalidDecl(); 5419 } 5420} 5421 5422bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5423 // FIXME: Need strict checking. In C89, we need to check for 5424 // any assignment, increment, decrement, function-calls, or 5425 // commas outside of a sizeof. In C99, it's the same list, 5426 // except that the aforementioned are allowed in unevaluated 5427 // expressions. Everything else falls under the 5428 // "may accept other forms of constant expressions" exception. 5429 // (We never end up here for C++, so the constant expression 5430 // rules there don't matter.) 5431 if (Init->isConstantInitializer(Context, false)) 5432 return false; 5433 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5434 << Init->getSourceRange(); 5435 return true; 5436} 5437 5438namespace { 5439 // Visits an initialization expression to see if OrigDecl is evaluated in 5440 // its own initialization and throws a warning if it does. 5441 class SelfReferenceChecker 5442 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5443 Sema &S; 5444 Decl *OrigDecl; 5445 bool isRecordType; 5446 bool isPODType; 5447 5448 public: 5449 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5450 5451 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5452 S(S), OrigDecl(OrigDecl) { 5453 isPODType = false; 5454 isRecordType = false; 5455 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5456 isPODType = VD->getType().isPODType(S.Context); 5457 isRecordType = VD->getType()->isRecordType(); 5458 } 5459 } 5460 5461 void VisitExpr(Expr *E) { 5462 if (isa<ObjCMessageExpr>(*E)) return; 5463 if (isRecordType) { 5464 Expr *expr = E; 5465 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5466 ValueDecl *VD = ME->getMemberDecl(); 5467 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5468 expr = ME->getBase(); 5469 } 5470 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5471 HandleDeclRefExpr(DRE); 5472 return; 5473 } 5474 } 5475 Inherited::VisitExpr(E); 5476 } 5477 5478 void VisitMemberExpr(MemberExpr *E) { 5479 if (E->getType()->canDecayToPointerType()) return; 5480 if (isa<FieldDecl>(E->getMemberDecl())) 5481 if (DeclRefExpr *DRE 5482 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5483 HandleDeclRefExpr(DRE); 5484 return; 5485 } 5486 Inherited::VisitMemberExpr(E); 5487 } 5488 5489 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5490 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5491 (isRecordType && E->getCastKind() == CK_NoOp)) { 5492 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5493 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5494 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5495 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5496 HandleDeclRefExpr(DRE); 5497 return; 5498 } 5499 } 5500 Inherited::VisitImplicitCastExpr(E); 5501 } 5502 5503 void VisitUnaryOperator(UnaryOperator *E) { 5504 // For POD record types, addresses of its own members are well-defined. 5505 if (isRecordType && isPODType) return; 5506 Inherited::VisitUnaryOperator(E); 5507 } 5508 5509 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5510 Decl* ReferenceDecl = DRE->getDecl(); 5511 if (OrigDecl != ReferenceDecl) return; 5512 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5513 Sema::NotForRedeclaration); 5514 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5515 S.PDiag(diag::warn_uninit_self_reference_in_init) 5516 << Result.getLookupName() 5517 << OrigDecl->getLocation() 5518 << DRE->getSourceRange()); 5519 } 5520 }; 5521} 5522 5523/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5524void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5525 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5526} 5527 5528/// AddInitializerToDecl - Adds the initializer Init to the 5529/// declaration dcl. If DirectInit is true, this is C++ direct 5530/// initialization rather than copy initialization. 5531void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5532 bool DirectInit, bool TypeMayContainAuto) { 5533 // If there is no declaration, there was an error parsing it. Just ignore 5534 // the initializer. 5535 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5536 return; 5537 5538 // Check for self-references within variable initializers. 5539 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5540 // Variables declared within a function/method body are handled 5541 // by a dataflow analysis. 5542 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5543 CheckSelfReference(RealDecl, Init); 5544 } 5545 else { 5546 CheckSelfReference(RealDecl, Init); 5547 } 5548 5549 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5550 // With declarators parsed the way they are, the parser cannot 5551 // distinguish between a normal initializer and a pure-specifier. 5552 // Thus this grotesque test. 5553 IntegerLiteral *IL; 5554 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5555 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5556 CheckPureMethod(Method, Init->getSourceRange()); 5557 else { 5558 Diag(Method->getLocation(), diag::err_member_function_initialization) 5559 << Method->getDeclName() << Init->getSourceRange(); 5560 Method->setInvalidDecl(); 5561 } 5562 return; 5563 } 5564 5565 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5566 if (!VDecl) { 5567 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5568 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5569 RealDecl->setInvalidDecl(); 5570 return; 5571 } 5572 5573 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5574 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5575 TypeSourceInfo *DeducedType = 0; 5576 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5577 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5578 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5579 << Init->getSourceRange(); 5580 if (!DeducedType) { 5581 RealDecl->setInvalidDecl(); 5582 return; 5583 } 5584 VDecl->setTypeSourceInfo(DeducedType); 5585 VDecl->setType(DeducedType->getType()); 5586 5587 // In ARC, infer lifetime. 5588 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5589 VDecl->setInvalidDecl(); 5590 5591 // If this is a redeclaration, check that the type we just deduced matches 5592 // the previously declared type. 5593 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5594 MergeVarDeclTypes(VDecl, Old); 5595 } 5596 5597 5598 // A definition must end up with a complete type, which means it must be 5599 // complete with the restriction that an array type might be completed by the 5600 // initializer; note that later code assumes this restriction. 5601 QualType BaseDeclType = VDecl->getType(); 5602 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5603 BaseDeclType = Array->getElementType(); 5604 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5605 diag::err_typecheck_decl_incomplete_type)) { 5606 RealDecl->setInvalidDecl(); 5607 return; 5608 } 5609 5610 // The variable can not have an abstract class type. 5611 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5612 diag::err_abstract_type_in_decl, 5613 AbstractVariableType)) 5614 VDecl->setInvalidDecl(); 5615 5616 const VarDecl *Def; 5617 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5618 Diag(VDecl->getLocation(), diag::err_redefinition) 5619 << VDecl->getDeclName(); 5620 Diag(Def->getLocation(), diag::note_previous_definition); 5621 VDecl->setInvalidDecl(); 5622 return; 5623 } 5624 5625 const VarDecl* PrevInit = 0; 5626 if (getLangOptions().CPlusPlus) { 5627 // C++ [class.static.data]p4 5628 // If a static data member is of const integral or const 5629 // enumeration type, its declaration in the class definition can 5630 // specify a constant-initializer which shall be an integral 5631 // constant expression (5.19). In that case, the member can appear 5632 // in integral constant expressions. The member shall still be 5633 // defined in a namespace scope if it is used in the program and the 5634 // namespace scope definition shall not contain an initializer. 5635 // 5636 // We already performed a redefinition check above, but for static 5637 // data members we also need to check whether there was an in-class 5638 // declaration with an initializer. 5639 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5640 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5641 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5642 return; 5643 } 5644 5645 if (VDecl->hasLocalStorage()) 5646 getCurFunction()->setHasBranchProtectedScope(); 5647 5648 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5649 VDecl->setInvalidDecl(); 5650 return; 5651 } 5652 } 5653 5654 // Capture the variable that is being initialized and the style of 5655 // initialization. 5656 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5657 5658 // FIXME: Poor source location information. 5659 InitializationKind Kind 5660 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5661 Init->getLocStart(), 5662 Init->getLocEnd()) 5663 : InitializationKind::CreateCopy(VDecl->getLocation(), 5664 Init->getLocStart()); 5665 5666 // Get the decls type and save a reference for later, since 5667 // CheckInitializerTypes may change it. 5668 QualType DclT = VDecl->getType(), SavT = DclT; 5669 if (VDecl->isLocalVarDecl()) { 5670 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5671 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5672 VDecl->setInvalidDecl(); 5673 } else if (!VDecl->isInvalidDecl()) { 5674 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5675 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5676 MultiExprArg(*this, &Init, 1), 5677 &DclT); 5678 if (Result.isInvalid()) { 5679 VDecl->setInvalidDecl(); 5680 return; 5681 } 5682 5683 Init = Result.takeAs<Expr>(); 5684 5685 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5686 // Don't check invalid declarations to avoid emitting useless diagnostics. 5687 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5688 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5689 CheckForConstantInitializer(Init, DclT); 5690 } 5691 } 5692 } else if (VDecl->isStaticDataMember() && 5693 VDecl->getLexicalDeclContext()->isRecord()) { 5694 // This is an in-class initialization for a static data member, e.g., 5695 // 5696 // struct S { 5697 // static const int value = 17; 5698 // }; 5699 5700 // Try to perform the initialization regardless. 5701 if (!VDecl->isInvalidDecl()) { 5702 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5703 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5704 MultiExprArg(*this, &Init, 1), 5705 &DclT); 5706 if (Result.isInvalid()) { 5707 VDecl->setInvalidDecl(); 5708 return; 5709 } 5710 5711 Init = Result.takeAs<Expr>(); 5712 } 5713 5714 // C++ [class.mem]p4: 5715 // A member-declarator can contain a constant-initializer only 5716 // if it declares a static member (9.4) of const integral or 5717 // const enumeration type, see 9.4.2. 5718 QualType T = VDecl->getType(); 5719 5720 // Do nothing on dependent types. 5721 if (T->isDependentType()) { 5722 5723 // Require constness. 5724 } else if (!T.isConstQualified()) { 5725 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5726 << Init->getSourceRange(); 5727 VDecl->setInvalidDecl(); 5728 5729 // We allow integer constant expressions in all cases. 5730 } else if (T->isIntegralOrEnumerationType()) { 5731 // Check whether the expression is a constant expression. 5732 SourceLocation Loc; 5733 if (Init->isValueDependent()) 5734 ; // Nothing to check. 5735 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5736 ; // Ok, it's an ICE! 5737 else if (Init->isEvaluatable(Context)) { 5738 // If we can constant fold the initializer through heroics, accept it, 5739 // but report this as a use of an extension for -pedantic. 5740 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5741 << Init->getSourceRange(); 5742 } else { 5743 // Otherwise, this is some crazy unknown case. Report the issue at the 5744 // location provided by the isIntegerConstantExpr failed check. 5745 Diag(Loc, diag::err_in_class_initializer_non_constant) 5746 << Init->getSourceRange(); 5747 VDecl->setInvalidDecl(); 5748 } 5749 5750 // We allow floating-point constants as an extension in C++03, and 5751 // C++0x has far more complicated rules that we don't really 5752 // implement fully. 5753 } else { 5754 bool Allowed = false; 5755 if (getLangOptions().CPlusPlus0x) { 5756 Allowed = T->isLiteralType(); 5757 } else if (T->isFloatingType()) { // also permits complex, which is ok 5758 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5759 << T << Init->getSourceRange(); 5760 Allowed = true; 5761 } 5762 5763 if (!Allowed) { 5764 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5765 << T << Init->getSourceRange(); 5766 VDecl->setInvalidDecl(); 5767 5768 // TODO: there are probably expressions that pass here that shouldn't. 5769 } else if (!Init->isValueDependent() && 5770 !Init->isConstantInitializer(Context, false)) { 5771 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5772 << Init->getSourceRange(); 5773 VDecl->setInvalidDecl(); 5774 } 5775 } 5776 } else if (VDecl->isFileVarDecl()) { 5777 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5778 (!getLangOptions().CPlusPlus || 5779 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5780 Diag(VDecl->getLocation(), diag::warn_extern_init); 5781 if (!VDecl->isInvalidDecl()) { 5782 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5783 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5784 MultiExprArg(*this, &Init, 1), 5785 &DclT); 5786 if (Result.isInvalid()) { 5787 VDecl->setInvalidDecl(); 5788 return; 5789 } 5790 5791 Init = Result.takeAs<Expr>(); 5792 } 5793 5794 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5795 // Don't check invalid declarations to avoid emitting useless diagnostics. 5796 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5797 // C99 6.7.8p4. All file scoped initializers need to be constant. 5798 CheckForConstantInitializer(Init, DclT); 5799 } 5800 } 5801 // If the type changed, it means we had an incomplete type that was 5802 // completed by the initializer. For example: 5803 // int ary[] = { 1, 3, 5 }; 5804 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5805 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5806 VDecl->setType(DclT); 5807 Init->setType(DclT); 5808 } 5809 5810 // Check any implicit conversions within the expression. 5811 CheckImplicitConversions(Init, VDecl->getLocation()); 5812 5813 if (!VDecl->isInvalidDecl()) 5814 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5815 5816 Init = MaybeCreateExprWithCleanups(Init); 5817 // Attach the initializer to the decl. 5818 VDecl->setInit(Init); 5819 5820 CheckCompleteVariableDeclaration(VDecl); 5821} 5822 5823/// ActOnInitializerError - Given that there was an error parsing an 5824/// initializer for the given declaration, try to return to some form 5825/// of sanity. 5826void Sema::ActOnInitializerError(Decl *D) { 5827 // Our main concern here is re-establishing invariants like "a 5828 // variable's type is either dependent or complete". 5829 if (!D || D->isInvalidDecl()) return; 5830 5831 VarDecl *VD = dyn_cast<VarDecl>(D); 5832 if (!VD) return; 5833 5834 // Auto types are meaningless if we can't make sense of the initializer. 5835 if (ParsingInitForAutoVars.count(D)) { 5836 D->setInvalidDecl(); 5837 return; 5838 } 5839 5840 QualType Ty = VD->getType(); 5841 if (Ty->isDependentType()) return; 5842 5843 // Require a complete type. 5844 if (RequireCompleteType(VD->getLocation(), 5845 Context.getBaseElementType(Ty), 5846 diag::err_typecheck_decl_incomplete_type)) { 5847 VD->setInvalidDecl(); 5848 return; 5849 } 5850 5851 // Require an abstract type. 5852 if (RequireNonAbstractType(VD->getLocation(), Ty, 5853 diag::err_abstract_type_in_decl, 5854 AbstractVariableType)) { 5855 VD->setInvalidDecl(); 5856 return; 5857 } 5858 5859 // Don't bother complaining about constructors or destructors, 5860 // though. 5861} 5862 5863void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5864 bool TypeMayContainAuto) { 5865 // If there is no declaration, there was an error parsing it. Just ignore it. 5866 if (RealDecl == 0) 5867 return; 5868 5869 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5870 QualType Type = Var->getType(); 5871 5872 // C++0x [dcl.spec.auto]p3 5873 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5874 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5875 << Var->getDeclName() << Type; 5876 Var->setInvalidDecl(); 5877 return; 5878 } 5879 5880 switch (Var->isThisDeclarationADefinition()) { 5881 case VarDecl::Definition: 5882 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5883 break; 5884 5885 // We have an out-of-line definition of a static data member 5886 // that has an in-class initializer, so we type-check this like 5887 // a declaration. 5888 // 5889 // Fall through 5890 5891 case VarDecl::DeclarationOnly: 5892 // It's only a declaration. 5893 5894 // Block scope. C99 6.7p7: If an identifier for an object is 5895 // declared with no linkage (C99 6.2.2p6), the type for the 5896 // object shall be complete. 5897 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5898 !Var->getLinkage() && !Var->isInvalidDecl() && 5899 RequireCompleteType(Var->getLocation(), Type, 5900 diag::err_typecheck_decl_incomplete_type)) 5901 Var->setInvalidDecl(); 5902 5903 // Make sure that the type is not abstract. 5904 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5905 RequireNonAbstractType(Var->getLocation(), Type, 5906 diag::err_abstract_type_in_decl, 5907 AbstractVariableType)) 5908 Var->setInvalidDecl(); 5909 return; 5910 5911 case VarDecl::TentativeDefinition: 5912 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5913 // object that has file scope without an initializer, and without a 5914 // storage-class specifier or with the storage-class specifier "static", 5915 // constitutes a tentative definition. Note: A tentative definition with 5916 // external linkage is valid (C99 6.2.2p5). 5917 if (!Var->isInvalidDecl()) { 5918 if (const IncompleteArrayType *ArrayT 5919 = Context.getAsIncompleteArrayType(Type)) { 5920 if (RequireCompleteType(Var->getLocation(), 5921 ArrayT->getElementType(), 5922 diag::err_illegal_decl_array_incomplete_type)) 5923 Var->setInvalidDecl(); 5924 } else if (Var->getStorageClass() == SC_Static) { 5925 // C99 6.9.2p3: If the declaration of an identifier for an object is 5926 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5927 // declared type shall not be an incomplete type. 5928 // NOTE: code such as the following 5929 // static struct s; 5930 // struct s { int a; }; 5931 // is accepted by gcc. Hence here we issue a warning instead of 5932 // an error and we do not invalidate the static declaration. 5933 // NOTE: to avoid multiple warnings, only check the first declaration. 5934 if (Var->getPreviousDeclaration() == 0) 5935 RequireCompleteType(Var->getLocation(), Type, 5936 diag::ext_typecheck_decl_incomplete_type); 5937 } 5938 } 5939 5940 // Record the tentative definition; we're done. 5941 if (!Var->isInvalidDecl()) 5942 TentativeDefinitions.push_back(Var); 5943 return; 5944 } 5945 5946 // Provide a specific diagnostic for uninitialized variable 5947 // definitions with incomplete array type. 5948 if (Type->isIncompleteArrayType()) { 5949 Diag(Var->getLocation(), 5950 diag::err_typecheck_incomplete_array_needs_initializer); 5951 Var->setInvalidDecl(); 5952 return; 5953 } 5954 5955 // Provide a specific diagnostic for uninitialized variable 5956 // definitions with reference type. 5957 if (Type->isReferenceType()) { 5958 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5959 << Var->getDeclName() 5960 << SourceRange(Var->getLocation(), Var->getLocation()); 5961 Var->setInvalidDecl(); 5962 return; 5963 } 5964 5965 // Do not attempt to type-check the default initializer for a 5966 // variable with dependent type. 5967 if (Type->isDependentType()) 5968 return; 5969 5970 if (Var->isInvalidDecl()) 5971 return; 5972 5973 if (RequireCompleteType(Var->getLocation(), 5974 Context.getBaseElementType(Type), 5975 diag::err_typecheck_decl_incomplete_type)) { 5976 Var->setInvalidDecl(); 5977 return; 5978 } 5979 5980 // The variable can not have an abstract class type. 5981 if (RequireNonAbstractType(Var->getLocation(), Type, 5982 diag::err_abstract_type_in_decl, 5983 AbstractVariableType)) { 5984 Var->setInvalidDecl(); 5985 return; 5986 } 5987 5988 // Check for jumps past the implicit initializer. C++0x 5989 // clarifies that this applies to a "variable with automatic 5990 // storage duration", not a "local variable". 5991 // C++0x [stmt.dcl]p3 5992 // A program that jumps from a point where a variable with automatic 5993 // storage duration is not in scope to a point where it is in scope is 5994 // ill-formed unless the variable has scalar type, class type with a 5995 // trivial default constructor and a trivial destructor, a cv-qualified 5996 // version of one of these types, or an array of one of the preceding 5997 // types and is declared without an initializer. 5998 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5999 if (const RecordType *Record 6000 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6001 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6002 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6003 (getLangOptions().CPlusPlus0x && 6004 (!CXXRecord->hasTrivialDefaultConstructor() || 6005 !CXXRecord->hasTrivialDestructor()))) 6006 getCurFunction()->setHasBranchProtectedScope(); 6007 } 6008 } 6009 6010 // C++03 [dcl.init]p9: 6011 // If no initializer is specified for an object, and the 6012 // object is of (possibly cv-qualified) non-POD class type (or 6013 // array thereof), the object shall be default-initialized; if 6014 // the object is of const-qualified type, the underlying class 6015 // type shall have a user-declared default 6016 // constructor. Otherwise, if no initializer is specified for 6017 // a non- static object, the object and its subobjects, if 6018 // any, have an indeterminate initial value); if the object 6019 // or any of its subobjects are of const-qualified type, the 6020 // program is ill-formed. 6021 // C++0x [dcl.init]p11: 6022 // If no initializer is specified for an object, the object is 6023 // default-initialized; [...]. 6024 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6025 InitializationKind Kind 6026 = InitializationKind::CreateDefault(Var->getLocation()); 6027 6028 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6029 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6030 MultiExprArg(*this, 0, 0)); 6031 if (Init.isInvalid()) 6032 Var->setInvalidDecl(); 6033 else if (Init.get()) 6034 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6035 6036 CheckCompleteVariableDeclaration(Var); 6037 } 6038} 6039 6040void Sema::ActOnCXXForRangeDecl(Decl *D) { 6041 VarDecl *VD = dyn_cast<VarDecl>(D); 6042 if (!VD) { 6043 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6044 D->setInvalidDecl(); 6045 return; 6046 } 6047 6048 VD->setCXXForRangeDecl(true); 6049 6050 // for-range-declaration cannot be given a storage class specifier. 6051 int Error = -1; 6052 switch (VD->getStorageClassAsWritten()) { 6053 case SC_None: 6054 break; 6055 case SC_Extern: 6056 Error = 0; 6057 break; 6058 case SC_Static: 6059 Error = 1; 6060 break; 6061 case SC_PrivateExtern: 6062 Error = 2; 6063 break; 6064 case SC_Auto: 6065 Error = 3; 6066 break; 6067 case SC_Register: 6068 Error = 4; 6069 break; 6070 } 6071 // FIXME: constexpr isn't allowed here. 6072 //if (DS.isConstexprSpecified()) 6073 // Error = 5; 6074 if (Error != -1) { 6075 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6076 << VD->getDeclName() << Error; 6077 D->setInvalidDecl(); 6078 } 6079} 6080 6081void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6082 if (var->isInvalidDecl()) return; 6083 6084 // In ARC, don't allow jumps past the implicit initialization of a 6085 // local retaining variable. 6086 if (getLangOptions().ObjCAutoRefCount && 6087 var->hasLocalStorage()) { 6088 switch (var->getType().getObjCLifetime()) { 6089 case Qualifiers::OCL_None: 6090 case Qualifiers::OCL_ExplicitNone: 6091 case Qualifiers::OCL_Autoreleasing: 6092 break; 6093 6094 case Qualifiers::OCL_Weak: 6095 case Qualifiers::OCL_Strong: 6096 getCurFunction()->setHasBranchProtectedScope(); 6097 break; 6098 } 6099 } 6100 6101 // All the following checks are C++ only. 6102 if (!getLangOptions().CPlusPlus) return; 6103 6104 QualType baseType = Context.getBaseElementType(var->getType()); 6105 if (baseType->isDependentType()) return; 6106 6107 // __block variables might require us to capture a copy-initializer. 6108 if (var->hasAttr<BlocksAttr>()) { 6109 // It's currently invalid to ever have a __block variable with an 6110 // array type; should we diagnose that here? 6111 6112 // Regardless, we don't want to ignore array nesting when 6113 // constructing this copy. 6114 QualType type = var->getType(); 6115 6116 if (type->isStructureOrClassType()) { 6117 SourceLocation poi = var->getLocation(); 6118 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6119 ExprResult result = 6120 PerformCopyInitialization( 6121 InitializedEntity::InitializeBlock(poi, type, false), 6122 poi, Owned(varRef)); 6123 if (!result.isInvalid()) { 6124 result = MaybeCreateExprWithCleanups(result); 6125 Expr *init = result.takeAs<Expr>(); 6126 Context.setBlockVarCopyInits(var, init); 6127 } 6128 } 6129 } 6130 6131 // Check for global constructors. 6132 if (!var->getDeclContext()->isDependentContext() && 6133 var->hasGlobalStorage() && 6134 !var->isStaticLocal() && 6135 var->getInit() && 6136 !var->getInit()->isConstantInitializer(Context, 6137 baseType->isReferenceType())) 6138 Diag(var->getLocation(), diag::warn_global_constructor) 6139 << var->getInit()->getSourceRange(); 6140 6141 // Require the destructor. 6142 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6143 FinalizeVarWithDestructor(var, recordType); 6144} 6145 6146/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6147/// any semantic actions necessary after any initializer has been attached. 6148void 6149Sema::FinalizeDeclaration(Decl *ThisDecl) { 6150 // Note that we are no longer parsing the initializer for this declaration. 6151 ParsingInitForAutoVars.erase(ThisDecl); 6152} 6153 6154Sema::DeclGroupPtrTy 6155Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6156 Decl **Group, unsigned NumDecls) { 6157 SmallVector<Decl*, 8> Decls; 6158 6159 if (DS.isTypeSpecOwned()) 6160 Decls.push_back(DS.getRepAsDecl()); 6161 6162 for (unsigned i = 0; i != NumDecls; ++i) 6163 if (Decl *D = Group[i]) 6164 Decls.push_back(D); 6165 6166 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6167 DS.getTypeSpecType() == DeclSpec::TST_auto); 6168} 6169 6170/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6171/// group, performing any necessary semantic checking. 6172Sema::DeclGroupPtrTy 6173Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6174 bool TypeMayContainAuto) { 6175 // C++0x [dcl.spec.auto]p7: 6176 // If the type deduced for the template parameter U is not the same in each 6177 // deduction, the program is ill-formed. 6178 // FIXME: When initializer-list support is added, a distinction is needed 6179 // between the deduced type U and the deduced type which 'auto' stands for. 6180 // auto a = 0, b = { 1, 2, 3 }; 6181 // is legal because the deduced type U is 'int' in both cases. 6182 if (TypeMayContainAuto && NumDecls > 1) { 6183 QualType Deduced; 6184 CanQualType DeducedCanon; 6185 VarDecl *DeducedDecl = 0; 6186 for (unsigned i = 0; i != NumDecls; ++i) { 6187 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6188 AutoType *AT = D->getType()->getContainedAutoType(); 6189 // Don't reissue diagnostics when instantiating a template. 6190 if (AT && D->isInvalidDecl()) 6191 break; 6192 if (AT && AT->isDeduced()) { 6193 QualType U = AT->getDeducedType(); 6194 CanQualType UCanon = Context.getCanonicalType(U); 6195 if (Deduced.isNull()) { 6196 Deduced = U; 6197 DeducedCanon = UCanon; 6198 DeducedDecl = D; 6199 } else if (DeducedCanon != UCanon) { 6200 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6201 diag::err_auto_different_deductions) 6202 << Deduced << DeducedDecl->getDeclName() 6203 << U << D->getDeclName() 6204 << DeducedDecl->getInit()->getSourceRange() 6205 << D->getInit()->getSourceRange(); 6206 D->setInvalidDecl(); 6207 break; 6208 } 6209 } 6210 } 6211 } 6212 } 6213 6214 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6215} 6216 6217 6218/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6219/// to introduce parameters into function prototype scope. 6220Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6221 const DeclSpec &DS = D.getDeclSpec(); 6222 6223 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6224 VarDecl::StorageClass StorageClass = SC_None; 6225 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6226 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6227 StorageClass = SC_Register; 6228 StorageClassAsWritten = SC_Register; 6229 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6230 Diag(DS.getStorageClassSpecLoc(), 6231 diag::err_invalid_storage_class_in_func_decl); 6232 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6233 } 6234 6235 if (D.getDeclSpec().isThreadSpecified()) 6236 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6237 if (D.getDeclSpec().isConstexprSpecified()) 6238 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6239 << 0; 6240 6241 DiagnoseFunctionSpecifiers(D); 6242 6243 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6244 QualType parmDeclType = TInfo->getType(); 6245 6246 if (getLangOptions().CPlusPlus) { 6247 // Check that there are no default arguments inside the type of this 6248 // parameter. 6249 CheckExtraCXXDefaultArguments(D); 6250 6251 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6252 if (D.getCXXScopeSpec().isSet()) { 6253 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6254 << D.getCXXScopeSpec().getRange(); 6255 D.getCXXScopeSpec().clear(); 6256 } 6257 } 6258 6259 // Ensure we have a valid name 6260 IdentifierInfo *II = 0; 6261 if (D.hasName()) { 6262 II = D.getIdentifier(); 6263 if (!II) { 6264 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6265 << GetNameForDeclarator(D).getName().getAsString(); 6266 D.setInvalidType(true); 6267 } 6268 } 6269 6270 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6271 if (II) { 6272 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6273 ForRedeclaration); 6274 LookupName(R, S); 6275 if (R.isSingleResult()) { 6276 NamedDecl *PrevDecl = R.getFoundDecl(); 6277 if (PrevDecl->isTemplateParameter()) { 6278 // Maybe we will complain about the shadowed template parameter. 6279 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6280 // Just pretend that we didn't see the previous declaration. 6281 PrevDecl = 0; 6282 } else if (S->isDeclScope(PrevDecl)) { 6283 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6284 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6285 6286 // Recover by removing the name 6287 II = 0; 6288 D.SetIdentifier(0, D.getIdentifierLoc()); 6289 D.setInvalidType(true); 6290 } 6291 } 6292 } 6293 6294 // Temporarily put parameter variables in the translation unit, not 6295 // the enclosing context. This prevents them from accidentally 6296 // looking like class members in C++. 6297 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6298 D.getSourceRange().getBegin(), 6299 D.getIdentifierLoc(), II, 6300 parmDeclType, TInfo, 6301 StorageClass, StorageClassAsWritten); 6302 6303 if (D.isInvalidType()) 6304 New->setInvalidDecl(); 6305 6306 assert(S->isFunctionPrototypeScope()); 6307 assert(S->getFunctionPrototypeDepth() >= 1); 6308 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6309 S->getNextFunctionPrototypeIndex()); 6310 6311 // Add the parameter declaration into this scope. 6312 S->AddDecl(New); 6313 if (II) 6314 IdResolver.AddDecl(New); 6315 6316 ProcessDeclAttributes(S, New, D); 6317 6318 if (New->hasAttr<BlocksAttr>()) { 6319 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6320 } 6321 return New; 6322} 6323 6324/// \brief Synthesizes a variable for a parameter arising from a 6325/// typedef. 6326ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6327 SourceLocation Loc, 6328 QualType T) { 6329 /* FIXME: setting StartLoc == Loc. 6330 Would it be worth to modify callers so as to provide proper source 6331 location for the unnamed parameters, embedding the parameter's type? */ 6332 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6333 T, Context.getTrivialTypeSourceInfo(T, Loc), 6334 SC_None, SC_None, 0); 6335 Param->setImplicit(); 6336 return Param; 6337} 6338 6339void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6340 ParmVarDecl * const *ParamEnd) { 6341 // Don't diagnose unused-parameter errors in template instantiations; we 6342 // will already have done so in the template itself. 6343 if (!ActiveTemplateInstantiations.empty()) 6344 return; 6345 6346 for (; Param != ParamEnd; ++Param) { 6347 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6348 !(*Param)->hasAttr<UnusedAttr>()) { 6349 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6350 << (*Param)->getDeclName(); 6351 } 6352 } 6353} 6354 6355void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6356 ParmVarDecl * const *ParamEnd, 6357 QualType ReturnTy, 6358 NamedDecl *D) { 6359 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6360 return; 6361 6362 // Warn if the return value is pass-by-value and larger than the specified 6363 // threshold. 6364 if (ReturnTy.isPODType(Context)) { 6365 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6366 if (Size > LangOpts.NumLargeByValueCopy) 6367 Diag(D->getLocation(), diag::warn_return_value_size) 6368 << D->getDeclName() << Size; 6369 } 6370 6371 // Warn if any parameter is pass-by-value and larger than the specified 6372 // threshold. 6373 for (; Param != ParamEnd; ++Param) { 6374 QualType T = (*Param)->getType(); 6375 if (!T.isPODType(Context)) 6376 continue; 6377 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6378 if (Size > LangOpts.NumLargeByValueCopy) 6379 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6380 << (*Param)->getDeclName() << Size; 6381 } 6382} 6383 6384ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6385 SourceLocation NameLoc, IdentifierInfo *Name, 6386 QualType T, TypeSourceInfo *TSInfo, 6387 VarDecl::StorageClass StorageClass, 6388 VarDecl::StorageClass StorageClassAsWritten) { 6389 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6390 if (getLangOptions().ObjCAutoRefCount && 6391 T.getObjCLifetime() == Qualifiers::OCL_None && 6392 T->isObjCLifetimeType()) { 6393 6394 Qualifiers::ObjCLifetime lifetime; 6395 6396 // Special cases for arrays: 6397 // - if it's const, use __unsafe_unretained 6398 // - otherwise, it's an error 6399 if (T->isArrayType()) { 6400 if (!T.isConstQualified()) { 6401 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6402 << TSInfo->getTypeLoc().getSourceRange(); 6403 } 6404 lifetime = Qualifiers::OCL_ExplicitNone; 6405 } else { 6406 lifetime = T->getObjCARCImplicitLifetime(); 6407 } 6408 T = Context.getLifetimeQualifiedType(T, lifetime); 6409 } 6410 6411 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6412 Context.getAdjustedParameterType(T), 6413 TSInfo, 6414 StorageClass, StorageClassAsWritten, 6415 0); 6416 6417 // Parameters can not be abstract class types. 6418 // For record types, this is done by the AbstractClassUsageDiagnoser once 6419 // the class has been completely parsed. 6420 if (!CurContext->isRecord() && 6421 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6422 AbstractParamType)) 6423 New->setInvalidDecl(); 6424 6425 // Parameter declarators cannot be interface types. All ObjC objects are 6426 // passed by reference. 6427 if (T->isObjCObjectType()) { 6428 Diag(NameLoc, 6429 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6430 << FixItHint::CreateInsertion(NameLoc, "*"); 6431 T = Context.getObjCObjectPointerType(T); 6432 New->setType(T); 6433 } 6434 6435 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6436 // duration shall not be qualified by an address-space qualifier." 6437 // Since all parameters have automatic store duration, they can not have 6438 // an address space. 6439 if (T.getAddressSpace() != 0) { 6440 Diag(NameLoc, diag::err_arg_with_address_space); 6441 New->setInvalidDecl(); 6442 } 6443 6444 return New; 6445} 6446 6447void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6448 SourceLocation LocAfterDecls) { 6449 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6450 6451 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6452 // for a K&R function. 6453 if (!FTI.hasPrototype) { 6454 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6455 --i; 6456 if (FTI.ArgInfo[i].Param == 0) { 6457 llvm::SmallString<256> Code; 6458 llvm::raw_svector_ostream(Code) << " int " 6459 << FTI.ArgInfo[i].Ident->getName() 6460 << ";\n"; 6461 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6462 << FTI.ArgInfo[i].Ident 6463 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6464 6465 // Implicitly declare the argument as type 'int' for lack of a better 6466 // type. 6467 AttributeFactory attrs; 6468 DeclSpec DS(attrs); 6469 const char* PrevSpec; // unused 6470 unsigned DiagID; // unused 6471 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6472 PrevSpec, DiagID); 6473 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6474 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6475 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6476 } 6477 } 6478 } 6479} 6480 6481Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6482 Declarator &D) { 6483 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6484 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6485 Scope *ParentScope = FnBodyScope->getParent(); 6486 6487 Decl *DP = HandleDeclarator(ParentScope, D, 6488 MultiTemplateParamsArg(*this), 6489 /*IsFunctionDefinition=*/true); 6490 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6491} 6492 6493static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6494 // Don't warn about invalid declarations. 6495 if (FD->isInvalidDecl()) 6496 return false; 6497 6498 // Or declarations that aren't global. 6499 if (!FD->isGlobal()) 6500 return false; 6501 6502 // Don't warn about C++ member functions. 6503 if (isa<CXXMethodDecl>(FD)) 6504 return false; 6505 6506 // Don't warn about 'main'. 6507 if (FD->isMain()) 6508 return false; 6509 6510 // Don't warn about inline functions. 6511 if (FD->isInlined()) 6512 return false; 6513 6514 // Don't warn about function templates. 6515 if (FD->getDescribedFunctionTemplate()) 6516 return false; 6517 6518 // Don't warn about function template specializations. 6519 if (FD->isFunctionTemplateSpecialization()) 6520 return false; 6521 6522 bool MissingPrototype = true; 6523 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6524 Prev; Prev = Prev->getPreviousDeclaration()) { 6525 // Ignore any declarations that occur in function or method 6526 // scope, because they aren't visible from the header. 6527 if (Prev->getDeclContext()->isFunctionOrMethod()) 6528 continue; 6529 6530 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6531 break; 6532 } 6533 6534 return MissingPrototype; 6535} 6536 6537void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6538 // Don't complain if we're in GNU89 mode and the previous definition 6539 // was an extern inline function. 6540 const FunctionDecl *Definition; 6541 if (FD->isDefined(Definition) && 6542 !canRedefineFunction(Definition, getLangOptions())) { 6543 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6544 Definition->getStorageClass() == SC_Extern) 6545 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6546 << FD->getDeclName() << getLangOptions().CPlusPlus; 6547 else 6548 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6549 Diag(Definition->getLocation(), diag::note_previous_definition); 6550 } 6551} 6552 6553Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6554 // Clear the last template instantiation error context. 6555 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6556 6557 if (!D) 6558 return D; 6559 FunctionDecl *FD = 0; 6560 6561 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6562 FD = FunTmpl->getTemplatedDecl(); 6563 else 6564 FD = cast<FunctionDecl>(D); 6565 6566 // Enter a new function scope 6567 PushFunctionScope(); 6568 6569 // See if this is a redefinition. 6570 if (!FD->isLateTemplateParsed()) 6571 CheckForFunctionRedefinition(FD); 6572 6573 // Builtin functions cannot be defined. 6574 if (unsigned BuiltinID = FD->getBuiltinID()) { 6575 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6576 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6577 FD->setInvalidDecl(); 6578 } 6579 } 6580 6581 // The return type of a function definition must be complete 6582 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6583 QualType ResultType = FD->getResultType(); 6584 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6585 !FD->isInvalidDecl() && 6586 RequireCompleteType(FD->getLocation(), ResultType, 6587 diag::err_func_def_incomplete_result)) 6588 FD->setInvalidDecl(); 6589 6590 // GNU warning -Wmissing-prototypes: 6591 // Warn if a global function is defined without a previous 6592 // prototype declaration. This warning is issued even if the 6593 // definition itself provides a prototype. The aim is to detect 6594 // global functions that fail to be declared in header files. 6595 if (ShouldWarnAboutMissingPrototype(FD)) 6596 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6597 6598 if (FnBodyScope) 6599 PushDeclContext(FnBodyScope, FD); 6600 6601 // Check the validity of our function parameters 6602 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6603 /*CheckParameterNames=*/true); 6604 6605 // Introduce our parameters into the function scope 6606 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6607 ParmVarDecl *Param = FD->getParamDecl(p); 6608 Param->setOwningFunction(FD); 6609 6610 // If this has an identifier, add it to the scope stack. 6611 if (Param->getIdentifier() && FnBodyScope) { 6612 CheckShadow(FnBodyScope, Param); 6613 6614 PushOnScopeChains(Param, FnBodyScope); 6615 } 6616 } 6617 6618 // Checking attributes of current function definition 6619 // dllimport attribute. 6620 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6621 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6622 // dllimport attribute cannot be directly applied to definition. 6623 // Microsoft accepts dllimport for functions defined within class scope. 6624 if (!DA->isInherited() && 6625 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6626 Diag(FD->getLocation(), 6627 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6628 << "dllimport"; 6629 FD->setInvalidDecl(); 6630 return FD; 6631 } 6632 6633 // Visual C++ appears to not think this is an issue, so only issue 6634 // a warning when Microsoft extensions are disabled. 6635 if (!LangOpts.Microsoft) { 6636 // If a symbol previously declared dllimport is later defined, the 6637 // attribute is ignored in subsequent references, and a warning is 6638 // emitted. 6639 Diag(FD->getLocation(), 6640 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6641 << FD->getName() << "dllimport"; 6642 } 6643 } 6644 return FD; 6645} 6646 6647/// \brief Given the set of return statements within a function body, 6648/// compute the variables that are subject to the named return value 6649/// optimization. 6650/// 6651/// Each of the variables that is subject to the named return value 6652/// optimization will be marked as NRVO variables in the AST, and any 6653/// return statement that has a marked NRVO variable as its NRVO candidate can 6654/// use the named return value optimization. 6655/// 6656/// This function applies a very simplistic algorithm for NRVO: if every return 6657/// statement in the function has the same NRVO candidate, that candidate is 6658/// the NRVO variable. 6659/// 6660/// FIXME: Employ a smarter algorithm that accounts for multiple return 6661/// statements and the lifetimes of the NRVO candidates. We should be able to 6662/// find a maximal set of NRVO variables. 6663void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6664 ReturnStmt **Returns = Scope->Returns.data(); 6665 6666 const VarDecl *NRVOCandidate = 0; 6667 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6668 if (!Returns[I]->getNRVOCandidate()) 6669 return; 6670 6671 if (!NRVOCandidate) 6672 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6673 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6674 return; 6675 } 6676 6677 if (NRVOCandidate) 6678 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6679} 6680 6681Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6682 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6683} 6684 6685Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6686 bool IsInstantiation) { 6687 FunctionDecl *FD = 0; 6688 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6689 if (FunTmpl) 6690 FD = FunTmpl->getTemplatedDecl(); 6691 else 6692 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6693 6694 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6695 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6696 6697 if (FD) { 6698 FD->setBody(Body); 6699 if (FD->isMain()) { 6700 // C and C++ allow for main to automagically return 0. 6701 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6702 FD->setHasImplicitReturnZero(true); 6703 WP.disableCheckFallThrough(); 6704 } else if (FD->hasAttr<NakedAttr>()) { 6705 // If the function is marked 'naked', don't complain about missing return 6706 // statements. 6707 WP.disableCheckFallThrough(); 6708 } 6709 6710 // MSVC permits the use of pure specifier (=0) on function definition, 6711 // defined at class scope, warn about this non standard construct. 6712 if (getLangOptions().Microsoft && FD->isPure()) 6713 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6714 6715 if (!FD->isInvalidDecl()) { 6716 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6717 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6718 FD->getResultType(), FD); 6719 6720 // If this is a constructor, we need a vtable. 6721 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6722 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6723 6724 computeNRVO(Body, getCurFunction()); 6725 } 6726 6727 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6728 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6729 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6730 MD->setBody(Body); 6731 if (Body) 6732 MD->setEndLoc(Body->getLocEnd()); 6733 if (!MD->isInvalidDecl()) { 6734 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6735 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6736 MD->getResultType(), MD); 6737 6738 if (Body) 6739 computeNRVO(Body, getCurFunction()); 6740 } 6741 if (ObjCShouldCallSuperDealloc) { 6742 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6743 ObjCShouldCallSuperDealloc = false; 6744 } 6745 if (ObjCShouldCallSuperFinalize) { 6746 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6747 ObjCShouldCallSuperFinalize = false; 6748 } 6749 } else { 6750 return 0; 6751 } 6752 6753 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6754 "ObjC methods, which should have been handled in the block above."); 6755 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6756 "ObjC methods, which should have been handled in the block above."); 6757 6758 // Verify and clean out per-function state. 6759 if (Body) { 6760 // C++ constructors that have function-try-blocks can't have return 6761 // statements in the handlers of that block. (C++ [except.handle]p14) 6762 // Verify this. 6763 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6764 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6765 6766 // Verify that gotos and switch cases don't jump into scopes illegally. 6767 if (getCurFunction()->NeedsScopeChecking() && 6768 !dcl->isInvalidDecl() && 6769 !hasAnyUnrecoverableErrorsInThisFunction()) 6770 DiagnoseInvalidJumps(Body); 6771 6772 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6773 if (!Destructor->getParent()->isDependentType()) 6774 CheckDestructor(Destructor); 6775 6776 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6777 Destructor->getParent()); 6778 } 6779 6780 // If any errors have occurred, clear out any temporaries that may have 6781 // been leftover. This ensures that these temporaries won't be picked up for 6782 // deletion in some later function. 6783 if (PP.getDiagnostics().hasErrorOccurred() || 6784 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6785 ExprTemporaries.clear(); 6786 ExprNeedsCleanups = false; 6787 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6788 // Since the body is valid, issue any analysis-based warnings that are 6789 // enabled. 6790 ActivePolicy = &WP; 6791 } 6792 6793 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6794 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6795 } 6796 6797 if (!IsInstantiation) 6798 PopDeclContext(); 6799 6800 PopFunctionOrBlockScope(ActivePolicy, dcl); 6801 6802 // If any errors have occurred, clear out any temporaries that may have 6803 // been leftover. This ensures that these temporaries won't be picked up for 6804 // deletion in some later function. 6805 if (getDiagnostics().hasErrorOccurred()) { 6806 ExprTemporaries.clear(); 6807 ExprNeedsCleanups = false; 6808 } 6809 6810 return dcl; 6811} 6812 6813 6814/// When we finish delayed parsing of an attribute, we must attach it to the 6815/// relevant Decl. 6816void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6817 ParsedAttributes &Attrs) { 6818 ProcessDeclAttributeList(S, D, Attrs.getList()); 6819} 6820 6821 6822/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6823/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6824NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6825 IdentifierInfo &II, Scope *S) { 6826 // Before we produce a declaration for an implicitly defined 6827 // function, see whether there was a locally-scoped declaration of 6828 // this name as a function or variable. If so, use that 6829 // (non-visible) declaration, and complain about it. 6830 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6831 = findLocallyScopedExternalDecl(&II); 6832 if (Pos != LocallyScopedExternalDecls.end()) { 6833 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6834 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6835 return Pos->second; 6836 } 6837 6838 // Extension in C99. Legal in C90, but warn about it. 6839 if (II.getName().startswith("__builtin_")) 6840 Diag(Loc, diag::warn_builtin_unknown) << &II; 6841 else if (getLangOptions().C99) 6842 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6843 else 6844 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6845 6846 // Set a Declarator for the implicit definition: int foo(); 6847 const char *Dummy; 6848 AttributeFactory attrFactory; 6849 DeclSpec DS(attrFactory); 6850 unsigned DiagID; 6851 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6852 (void)Error; // Silence warning. 6853 assert(!Error && "Error setting up implicit decl!"); 6854 Declarator D(DS, Declarator::BlockContext); 6855 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6856 0, 0, true, SourceLocation(), 6857 SourceLocation(), 6858 EST_None, SourceLocation(), 6859 0, 0, 0, 0, Loc, Loc, D), 6860 DS.getAttributes(), 6861 SourceLocation()); 6862 D.SetIdentifier(&II, Loc); 6863 6864 // Insert this function into translation-unit scope. 6865 6866 DeclContext *PrevDC = CurContext; 6867 CurContext = Context.getTranslationUnitDecl(); 6868 6869 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6870 FD->setImplicit(); 6871 6872 CurContext = PrevDC; 6873 6874 AddKnownFunctionAttributes(FD); 6875 6876 return FD; 6877} 6878 6879/// \brief Adds any function attributes that we know a priori based on 6880/// the declaration of this function. 6881/// 6882/// These attributes can apply both to implicitly-declared builtins 6883/// (like __builtin___printf_chk) or to library-declared functions 6884/// like NSLog or printf. 6885/// 6886/// We need to check for duplicate attributes both here and where user-written 6887/// attributes are applied to declarations. 6888void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6889 if (FD->isInvalidDecl()) 6890 return; 6891 6892 // If this is a built-in function, map its builtin attributes to 6893 // actual attributes. 6894 if (unsigned BuiltinID = FD->getBuiltinID()) { 6895 // Handle printf-formatting attributes. 6896 unsigned FormatIdx; 6897 bool HasVAListArg; 6898 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6899 if (!FD->getAttr<FormatAttr>()) 6900 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6901 "printf", FormatIdx+1, 6902 HasVAListArg ? 0 : FormatIdx+2)); 6903 } 6904 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6905 HasVAListArg)) { 6906 if (!FD->getAttr<FormatAttr>()) 6907 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6908 "scanf", FormatIdx+1, 6909 HasVAListArg ? 0 : FormatIdx+2)); 6910 } 6911 6912 // Mark const if we don't care about errno and that is the only 6913 // thing preventing the function from being const. This allows 6914 // IRgen to use LLVM intrinsics for such functions. 6915 if (!getLangOptions().MathErrno && 6916 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6917 if (!FD->getAttr<ConstAttr>()) 6918 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6919 } 6920 6921 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 6922 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6923 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 6924 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6925 } 6926 6927 IdentifierInfo *Name = FD->getIdentifier(); 6928 if (!Name) 6929 return; 6930 if ((!getLangOptions().CPlusPlus && 6931 FD->getDeclContext()->isTranslationUnit()) || 6932 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6933 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6934 LinkageSpecDecl::lang_c)) { 6935 // Okay: this could be a libc/libm/Objective-C function we know 6936 // about. 6937 } else 6938 return; 6939 6940 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6941 // FIXME: NSLog and NSLogv should be target specific 6942 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6943 // FIXME: We known better than our headers. 6944 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6945 } else 6946 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6947 "printf", 1, 6948 Name->isStr("NSLogv") ? 0 : 2)); 6949 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6950 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6951 // target-specific builtins, perhaps? 6952 if (!FD->getAttr<FormatAttr>()) 6953 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6954 "printf", 2, 6955 Name->isStr("vasprintf") ? 0 : 3)); 6956 } 6957} 6958 6959TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6960 TypeSourceInfo *TInfo) { 6961 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6962 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6963 6964 if (!TInfo) { 6965 assert(D.isInvalidType() && "no declarator info for valid type"); 6966 TInfo = Context.getTrivialTypeSourceInfo(T); 6967 } 6968 6969 // Scope manipulation handled by caller. 6970 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6971 D.getSourceRange().getBegin(), 6972 D.getIdentifierLoc(), 6973 D.getIdentifier(), 6974 TInfo); 6975 6976 // Bail out immediately if we have an invalid declaration. 6977 if (D.isInvalidType()) { 6978 NewTD->setInvalidDecl(); 6979 return NewTD; 6980 } 6981 6982 if (D.getDeclSpec().isModulePrivateSpecified()) 6983 NewTD->setModulePrivate(); 6984 6985 // C++ [dcl.typedef]p8: 6986 // If the typedef declaration defines an unnamed class (or 6987 // enum), the first typedef-name declared by the declaration 6988 // to be that class type (or enum type) is used to denote the 6989 // class type (or enum type) for linkage purposes only. 6990 // We need to check whether the type was declared in the declaration. 6991 switch (D.getDeclSpec().getTypeSpecType()) { 6992 case TST_enum: 6993 case TST_struct: 6994 case TST_union: 6995 case TST_class: { 6996 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6997 6998 // Do nothing if the tag is not anonymous or already has an 6999 // associated typedef (from an earlier typedef in this decl group). 7000 if (tagFromDeclSpec->getIdentifier()) break; 7001 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7002 7003 // A well-formed anonymous tag must always be a TUK_Definition. 7004 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7005 7006 // The type must match the tag exactly; no qualifiers allowed. 7007 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7008 break; 7009 7010 // Otherwise, set this is the anon-decl typedef for the tag. 7011 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7012 break; 7013 } 7014 7015 default: 7016 break; 7017 } 7018 7019 return NewTD; 7020} 7021 7022 7023/// \brief Determine whether a tag with a given kind is acceptable 7024/// as a redeclaration of the given tag declaration. 7025/// 7026/// \returns true if the new tag kind is acceptable, false otherwise. 7027bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7028 TagTypeKind NewTag, bool isDefinition, 7029 SourceLocation NewTagLoc, 7030 const IdentifierInfo &Name) { 7031 // C++ [dcl.type.elab]p3: 7032 // The class-key or enum keyword present in the 7033 // elaborated-type-specifier shall agree in kind with the 7034 // declaration to which the name in the elaborated-type-specifier 7035 // refers. This rule also applies to the form of 7036 // elaborated-type-specifier that declares a class-name or 7037 // friend class since it can be construed as referring to the 7038 // definition of the class. Thus, in any 7039 // elaborated-type-specifier, the enum keyword shall be used to 7040 // refer to an enumeration (7.2), the union class-key shall be 7041 // used to refer to a union (clause 9), and either the class or 7042 // struct class-key shall be used to refer to a class (clause 9) 7043 // declared using the class or struct class-key. 7044 TagTypeKind OldTag = Previous->getTagKind(); 7045 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7046 if (OldTag == NewTag) 7047 return true; 7048 7049 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7050 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7051 // Warn about the struct/class tag mismatch. 7052 bool isTemplate = false; 7053 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7054 isTemplate = Record->getDescribedClassTemplate(); 7055 7056 if (!ActiveTemplateInstantiations.empty()) { 7057 // In a template instantiation, do not offer fix-its for tag mismatches 7058 // since they usually mess up the template instead of fixing the problem. 7059 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7060 << (NewTag == TTK_Class) << isTemplate << &Name; 7061 return true; 7062 } 7063 7064 if (isDefinition) { 7065 // On definitions, check previous tags and issue a fix-it for each 7066 // one that doesn't match the current tag. 7067 if (Previous->getDefinition()) { 7068 // Don't suggest fix-its for redefinitions. 7069 return true; 7070 } 7071 7072 bool previousMismatch = false; 7073 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7074 E(Previous->redecls_end()); I != E; ++I) { 7075 if (I->getTagKind() != NewTag) { 7076 if (!previousMismatch) { 7077 previousMismatch = true; 7078 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7079 << (NewTag == TTK_Class) << isTemplate << &Name; 7080 } 7081 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7082 << (NewTag == TTK_Class) 7083 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7084 NewTag == TTK_Class? 7085 "class" : "struct"); 7086 } 7087 } 7088 return true; 7089 } 7090 7091 // Check for a previous definition. If current tag and definition 7092 // are same type, do nothing. If no definition, but disagree with 7093 // with previous tag type, give a warning, but no fix-it. 7094 const TagDecl *Redecl = Previous->getDefinition() ? 7095 Previous->getDefinition() : Previous; 7096 if (Redecl->getTagKind() == NewTag) { 7097 return true; 7098 } 7099 7100 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7101 << (NewTag == TTK_Class) 7102 << isTemplate << &Name; 7103 Diag(Redecl->getLocation(), diag::note_previous_use); 7104 7105 // If there is a previous defintion, suggest a fix-it. 7106 if (Previous->getDefinition()) { 7107 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7108 << (Redecl->getTagKind() == TTK_Class) 7109 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7110 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7111 } 7112 7113 return true; 7114 } 7115 return false; 7116} 7117 7118/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7119/// former case, Name will be non-null. In the later case, Name will be null. 7120/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7121/// reference/declaration/definition of a tag. 7122Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7123 SourceLocation KWLoc, CXXScopeSpec &SS, 7124 IdentifierInfo *Name, SourceLocation NameLoc, 7125 AttributeList *Attr, AccessSpecifier AS, 7126 bool IsModulePrivate, 7127 MultiTemplateParamsArg TemplateParameterLists, 7128 bool &OwnedDecl, bool &IsDependent, 7129 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7130 TypeResult UnderlyingType) { 7131 // If this is not a definition, it must have a name. 7132 assert((Name != 0 || TUK == TUK_Definition) && 7133 "Nameless record must be a definition!"); 7134 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7135 7136 OwnedDecl = false; 7137 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7138 7139 // FIXME: Check explicit specializations more carefully. 7140 bool isExplicitSpecialization = false; 7141 bool Invalid = false; 7142 7143 // We only need to do this matching if we have template parameters 7144 // or a scope specifier, which also conveniently avoids this work 7145 // for non-C++ cases. 7146 if (TemplateParameterLists.size() > 0 || 7147 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7148 if (TemplateParameterList *TemplateParams 7149 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7150 TemplateParameterLists.get(), 7151 TemplateParameterLists.size(), 7152 TUK == TUK_Friend, 7153 isExplicitSpecialization, 7154 Invalid)) { 7155 if (TemplateParams->size() > 0) { 7156 // This is a declaration or definition of a class template (which may 7157 // be a member of another template). 7158 7159 if (Invalid) 7160 return 0; 7161 7162 OwnedDecl = false; 7163 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7164 SS, Name, NameLoc, Attr, 7165 TemplateParams, AS, 7166 IsModulePrivate, 7167 TemplateParameterLists.size() - 1, 7168 (TemplateParameterList**) TemplateParameterLists.release()); 7169 return Result.get(); 7170 } else { 7171 // The "template<>" header is extraneous. 7172 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7173 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7174 isExplicitSpecialization = true; 7175 } 7176 } 7177 } 7178 7179 // Figure out the underlying type if this a enum declaration. We need to do 7180 // this early, because it's needed to detect if this is an incompatible 7181 // redeclaration. 7182 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7183 7184 if (Kind == TTK_Enum) { 7185 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7186 // No underlying type explicitly specified, or we failed to parse the 7187 // type, default to int. 7188 EnumUnderlying = Context.IntTy.getTypePtr(); 7189 else if (UnderlyingType.get()) { 7190 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7191 // integral type; any cv-qualification is ignored. 7192 TypeSourceInfo *TI = 0; 7193 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7194 EnumUnderlying = TI; 7195 7196 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7197 7198 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7199 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7200 << T; 7201 // Recover by falling back to int. 7202 EnumUnderlying = Context.IntTy.getTypePtr(); 7203 } 7204 7205 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7206 UPPC_FixedUnderlyingType)) 7207 EnumUnderlying = Context.IntTy.getTypePtr(); 7208 7209 } else if (getLangOptions().Microsoft) 7210 // Microsoft enums are always of int type. 7211 EnumUnderlying = Context.IntTy.getTypePtr(); 7212 } 7213 7214 DeclContext *SearchDC = CurContext; 7215 DeclContext *DC = CurContext; 7216 bool isStdBadAlloc = false; 7217 7218 RedeclarationKind Redecl = ForRedeclaration; 7219 if (TUK == TUK_Friend || TUK == TUK_Reference) 7220 Redecl = NotForRedeclaration; 7221 7222 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7223 7224 if (Name && SS.isNotEmpty()) { 7225 // We have a nested-name tag ('struct foo::bar'). 7226 7227 // Check for invalid 'foo::'. 7228 if (SS.isInvalid()) { 7229 Name = 0; 7230 goto CreateNewDecl; 7231 } 7232 7233 // If this is a friend or a reference to a class in a dependent 7234 // context, don't try to make a decl for it. 7235 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7236 DC = computeDeclContext(SS, false); 7237 if (!DC) { 7238 IsDependent = true; 7239 return 0; 7240 } 7241 } else { 7242 DC = computeDeclContext(SS, true); 7243 if (!DC) { 7244 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7245 << SS.getRange(); 7246 return 0; 7247 } 7248 } 7249 7250 if (RequireCompleteDeclContext(SS, DC)) 7251 return 0; 7252 7253 SearchDC = DC; 7254 // Look-up name inside 'foo::'. 7255 LookupQualifiedName(Previous, DC); 7256 7257 if (Previous.isAmbiguous()) 7258 return 0; 7259 7260 if (Previous.empty()) { 7261 // Name lookup did not find anything. However, if the 7262 // nested-name-specifier refers to the current instantiation, 7263 // and that current instantiation has any dependent base 7264 // classes, we might find something at instantiation time: treat 7265 // this as a dependent elaborated-type-specifier. 7266 // But this only makes any sense for reference-like lookups. 7267 if (Previous.wasNotFoundInCurrentInstantiation() && 7268 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7269 IsDependent = true; 7270 return 0; 7271 } 7272 7273 // A tag 'foo::bar' must already exist. 7274 Diag(NameLoc, diag::err_not_tag_in_scope) 7275 << Kind << Name << DC << SS.getRange(); 7276 Name = 0; 7277 Invalid = true; 7278 goto CreateNewDecl; 7279 } 7280 } else if (Name) { 7281 // If this is a named struct, check to see if there was a previous forward 7282 // declaration or definition. 7283 // FIXME: We're looking into outer scopes here, even when we 7284 // shouldn't be. Doing so can result in ambiguities that we 7285 // shouldn't be diagnosing. 7286 LookupName(Previous, S); 7287 7288 if (Previous.isAmbiguous() && 7289 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7290 LookupResult::Filter F = Previous.makeFilter(); 7291 while (F.hasNext()) { 7292 NamedDecl *ND = F.next(); 7293 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7294 F.erase(); 7295 } 7296 F.done(); 7297 } 7298 7299 // Note: there used to be some attempt at recovery here. 7300 if (Previous.isAmbiguous()) 7301 return 0; 7302 7303 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7304 // FIXME: This makes sure that we ignore the contexts associated 7305 // with C structs, unions, and enums when looking for a matching 7306 // tag declaration or definition. See the similar lookup tweak 7307 // in Sema::LookupName; is there a better way to deal with this? 7308 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7309 SearchDC = SearchDC->getParent(); 7310 } 7311 } else if (S->isFunctionPrototypeScope()) { 7312 // If this is an enum declaration in function prototype scope, set its 7313 // initial context to the translation unit. 7314 SearchDC = Context.getTranslationUnitDecl(); 7315 } 7316 7317 if (Previous.isSingleResult() && 7318 Previous.getFoundDecl()->isTemplateParameter()) { 7319 // Maybe we will complain about the shadowed template parameter. 7320 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7321 // Just pretend that we didn't see the previous declaration. 7322 Previous.clear(); 7323 } 7324 7325 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7326 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7327 // This is a declaration of or a reference to "std::bad_alloc". 7328 isStdBadAlloc = true; 7329 7330 if (Previous.empty() && StdBadAlloc) { 7331 // std::bad_alloc has been implicitly declared (but made invisible to 7332 // name lookup). Fill in this implicit declaration as the previous 7333 // declaration, so that the declarations get chained appropriately. 7334 Previous.addDecl(getStdBadAlloc()); 7335 } 7336 } 7337 7338 // If we didn't find a previous declaration, and this is a reference 7339 // (or friend reference), move to the correct scope. In C++, we 7340 // also need to do a redeclaration lookup there, just in case 7341 // there's a shadow friend decl. 7342 if (Name && Previous.empty() && 7343 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7344 if (Invalid) goto CreateNewDecl; 7345 assert(SS.isEmpty()); 7346 7347 if (TUK == TUK_Reference) { 7348 // C++ [basic.scope.pdecl]p5: 7349 // -- for an elaborated-type-specifier of the form 7350 // 7351 // class-key identifier 7352 // 7353 // if the elaborated-type-specifier is used in the 7354 // decl-specifier-seq or parameter-declaration-clause of a 7355 // function defined in namespace scope, the identifier is 7356 // declared as a class-name in the namespace that contains 7357 // the declaration; otherwise, except as a friend 7358 // declaration, the identifier is declared in the smallest 7359 // non-class, non-function-prototype scope that contains the 7360 // declaration. 7361 // 7362 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7363 // C structs and unions. 7364 // 7365 // It is an error in C++ to declare (rather than define) an enum 7366 // type, including via an elaborated type specifier. We'll 7367 // diagnose that later; for now, declare the enum in the same 7368 // scope as we would have picked for any other tag type. 7369 // 7370 // GNU C also supports this behavior as part of its incomplete 7371 // enum types extension, while GNU C++ does not. 7372 // 7373 // Find the context where we'll be declaring the tag. 7374 // FIXME: We would like to maintain the current DeclContext as the 7375 // lexical context, 7376 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7377 SearchDC = SearchDC->getParent(); 7378 7379 // Find the scope where we'll be declaring the tag. 7380 while (S->isClassScope() || 7381 (getLangOptions().CPlusPlus && 7382 S->isFunctionPrototypeScope()) || 7383 ((S->getFlags() & Scope::DeclScope) == 0) || 7384 (S->getEntity() && 7385 ((DeclContext *)S->getEntity())->isTransparentContext())) 7386 S = S->getParent(); 7387 } else { 7388 assert(TUK == TUK_Friend); 7389 // C++ [namespace.memdef]p3: 7390 // If a friend declaration in a non-local class first declares a 7391 // class or function, the friend class or function is a member of 7392 // the innermost enclosing namespace. 7393 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7394 } 7395 7396 // In C++, we need to do a redeclaration lookup to properly 7397 // diagnose some problems. 7398 if (getLangOptions().CPlusPlus) { 7399 Previous.setRedeclarationKind(ForRedeclaration); 7400 LookupQualifiedName(Previous, SearchDC); 7401 } 7402 } 7403 7404 if (!Previous.empty()) { 7405 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7406 7407 // It's okay to have a tag decl in the same scope as a typedef 7408 // which hides a tag decl in the same scope. Finding this 7409 // insanity with a redeclaration lookup can only actually happen 7410 // in C++. 7411 // 7412 // This is also okay for elaborated-type-specifiers, which is 7413 // technically forbidden by the current standard but which is 7414 // okay according to the likely resolution of an open issue; 7415 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7416 if (getLangOptions().CPlusPlus) { 7417 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7418 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7419 TagDecl *Tag = TT->getDecl(); 7420 if (Tag->getDeclName() == Name && 7421 Tag->getDeclContext()->getRedeclContext() 7422 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7423 PrevDecl = Tag; 7424 Previous.clear(); 7425 Previous.addDecl(Tag); 7426 Previous.resolveKind(); 7427 } 7428 } 7429 } 7430 } 7431 7432 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7433 // If this is a use of a previous tag, or if the tag is already declared 7434 // in the same scope (so that the definition/declaration completes or 7435 // rementions the tag), reuse the decl. 7436 if (TUK == TUK_Reference || TUK == TUK_Friend || 7437 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7438 // Make sure that this wasn't declared as an enum and now used as a 7439 // struct or something similar. 7440 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7441 TUK == TUK_Definition, KWLoc, 7442 *Name)) { 7443 bool SafeToContinue 7444 = (PrevTagDecl->getTagKind() != TTK_Enum && 7445 Kind != TTK_Enum); 7446 if (SafeToContinue) 7447 Diag(KWLoc, diag::err_use_with_wrong_tag) 7448 << Name 7449 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7450 PrevTagDecl->getKindName()); 7451 else 7452 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7453 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7454 7455 if (SafeToContinue) 7456 Kind = PrevTagDecl->getTagKind(); 7457 else { 7458 // Recover by making this an anonymous redefinition. 7459 Name = 0; 7460 Previous.clear(); 7461 Invalid = true; 7462 } 7463 } 7464 7465 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7466 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7467 7468 // All conflicts with previous declarations are recovered by 7469 // returning the previous declaration. 7470 if (ScopedEnum != PrevEnum->isScoped()) { 7471 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7472 << PrevEnum->isScoped(); 7473 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7474 return PrevTagDecl; 7475 } 7476 else if (EnumUnderlying && PrevEnum->isFixed()) { 7477 QualType T; 7478 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7479 T = TI->getType(); 7480 else 7481 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7482 7483 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7484 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7485 diag::err_enum_redeclare_type_mismatch) 7486 << T 7487 << PrevEnum->getIntegerType(); 7488 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7489 return PrevTagDecl; 7490 } 7491 } 7492 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7493 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7494 << PrevEnum->isFixed(); 7495 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7496 return PrevTagDecl; 7497 } 7498 } 7499 7500 if (!Invalid) { 7501 // If this is a use, just return the declaration we found. 7502 7503 // FIXME: In the future, return a variant or some other clue 7504 // for the consumer of this Decl to know it doesn't own it. 7505 // For our current ASTs this shouldn't be a problem, but will 7506 // need to be changed with DeclGroups. 7507 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7508 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7509 return PrevTagDecl; 7510 7511 // Diagnose attempts to redefine a tag. 7512 if (TUK == TUK_Definition) { 7513 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7514 // If we're defining a specialization and the previous definition 7515 // is from an implicit instantiation, don't emit an error 7516 // here; we'll catch this in the general case below. 7517 if (!isExplicitSpecialization || 7518 !isa<CXXRecordDecl>(Def) || 7519 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7520 == TSK_ExplicitSpecialization) { 7521 Diag(NameLoc, diag::err_redefinition) << Name; 7522 Diag(Def->getLocation(), diag::note_previous_definition); 7523 // If this is a redefinition, recover by making this 7524 // struct be anonymous, which will make any later 7525 // references get the previous definition. 7526 Name = 0; 7527 Previous.clear(); 7528 Invalid = true; 7529 } 7530 } else { 7531 // If the type is currently being defined, complain 7532 // about a nested redefinition. 7533 const TagType *Tag 7534 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7535 if (Tag->isBeingDefined()) { 7536 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7537 Diag(PrevTagDecl->getLocation(), 7538 diag::note_previous_definition); 7539 Name = 0; 7540 Previous.clear(); 7541 Invalid = true; 7542 } 7543 } 7544 7545 // Okay, this is definition of a previously declared or referenced 7546 // tag PrevDecl. We're going to create a new Decl for it. 7547 } 7548 } 7549 // If we get here we have (another) forward declaration or we 7550 // have a definition. Just create a new decl. 7551 7552 } else { 7553 // If we get here, this is a definition of a new tag type in a nested 7554 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7555 // new decl/type. We set PrevDecl to NULL so that the entities 7556 // have distinct types. 7557 Previous.clear(); 7558 } 7559 // If we get here, we're going to create a new Decl. If PrevDecl 7560 // is non-NULL, it's a definition of the tag declared by 7561 // PrevDecl. If it's NULL, we have a new definition. 7562 7563 7564 // Otherwise, PrevDecl is not a tag, but was found with tag 7565 // lookup. This is only actually possible in C++, where a few 7566 // things like templates still live in the tag namespace. 7567 } else { 7568 assert(getLangOptions().CPlusPlus); 7569 7570 // Use a better diagnostic if an elaborated-type-specifier 7571 // found the wrong kind of type on the first 7572 // (non-redeclaration) lookup. 7573 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7574 !Previous.isForRedeclaration()) { 7575 unsigned Kind = 0; 7576 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7577 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7578 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7579 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7580 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7581 Invalid = true; 7582 7583 // Otherwise, only diagnose if the declaration is in scope. 7584 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7585 isExplicitSpecialization)) { 7586 // do nothing 7587 7588 // Diagnose implicit declarations introduced by elaborated types. 7589 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7590 unsigned Kind = 0; 7591 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7592 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7593 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7594 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7595 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7596 Invalid = true; 7597 7598 // Otherwise it's a declaration. Call out a particularly common 7599 // case here. 7600 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7601 unsigned Kind = 0; 7602 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7603 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7604 << Name << Kind << TND->getUnderlyingType(); 7605 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7606 Invalid = true; 7607 7608 // Otherwise, diagnose. 7609 } else { 7610 // The tag name clashes with something else in the target scope, 7611 // issue an error and recover by making this tag be anonymous. 7612 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7613 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7614 Name = 0; 7615 Invalid = true; 7616 } 7617 7618 // The existing declaration isn't relevant to us; we're in a 7619 // new scope, so clear out the previous declaration. 7620 Previous.clear(); 7621 } 7622 } 7623 7624CreateNewDecl: 7625 7626 TagDecl *PrevDecl = 0; 7627 if (Previous.isSingleResult()) 7628 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7629 7630 // If there is an identifier, use the location of the identifier as the 7631 // location of the decl, otherwise use the location of the struct/union 7632 // keyword. 7633 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7634 7635 // Otherwise, create a new declaration. If there is a previous 7636 // declaration of the same entity, the two will be linked via 7637 // PrevDecl. 7638 TagDecl *New; 7639 7640 bool IsForwardReference = false; 7641 if (Kind == TTK_Enum) { 7642 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7643 // enum X { A, B, C } D; D should chain to X. 7644 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7645 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7646 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7647 // If this is an undefined enum, warn. 7648 if (TUK != TUK_Definition && !Invalid) { 7649 TagDecl *Def; 7650 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7651 // C++0x: 7.2p2: opaque-enum-declaration. 7652 // Conflicts are diagnosed above. Do nothing. 7653 } 7654 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7655 Diag(Loc, diag::ext_forward_ref_enum_def) 7656 << New; 7657 Diag(Def->getLocation(), diag::note_previous_definition); 7658 } else { 7659 unsigned DiagID = diag::ext_forward_ref_enum; 7660 if (getLangOptions().Microsoft) 7661 DiagID = diag::ext_ms_forward_ref_enum; 7662 else if (getLangOptions().CPlusPlus) 7663 DiagID = diag::err_forward_ref_enum; 7664 Diag(Loc, DiagID); 7665 7666 // If this is a forward-declared reference to an enumeration, make a 7667 // note of it; we won't actually be introducing the declaration into 7668 // the declaration context. 7669 if (TUK == TUK_Reference) 7670 IsForwardReference = true; 7671 } 7672 } 7673 7674 if (EnumUnderlying) { 7675 EnumDecl *ED = cast<EnumDecl>(New); 7676 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7677 ED->setIntegerTypeSourceInfo(TI); 7678 else 7679 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7680 ED->setPromotionType(ED->getIntegerType()); 7681 } 7682 7683 } else { 7684 // struct/union/class 7685 7686 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7687 // struct X { int A; } D; D should chain to X. 7688 if (getLangOptions().CPlusPlus) { 7689 // FIXME: Look for a way to use RecordDecl for simple structs. 7690 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7691 cast_or_null<CXXRecordDecl>(PrevDecl)); 7692 7693 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7694 StdBadAlloc = cast<CXXRecordDecl>(New); 7695 } else 7696 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7697 cast_or_null<RecordDecl>(PrevDecl)); 7698 } 7699 7700 // Maybe add qualifier info. 7701 if (SS.isNotEmpty()) { 7702 if (SS.isSet()) { 7703 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7704 if (TemplateParameterLists.size() > 0) { 7705 New->setTemplateParameterListsInfo(Context, 7706 TemplateParameterLists.size(), 7707 (TemplateParameterList**) TemplateParameterLists.release()); 7708 } 7709 } 7710 else 7711 Invalid = true; 7712 } 7713 7714 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7715 // Add alignment attributes if necessary; these attributes are checked when 7716 // the ASTContext lays out the structure. 7717 // 7718 // It is important for implementing the correct semantics that this 7719 // happen here (in act on tag decl). The #pragma pack stack is 7720 // maintained as a result of parser callbacks which can occur at 7721 // many points during the parsing of a struct declaration (because 7722 // the #pragma tokens are effectively skipped over during the 7723 // parsing of the struct). 7724 AddAlignmentAttributesForRecord(RD); 7725 7726 AddMsStructLayoutForRecord(RD); 7727 } 7728 7729 if (IsModulePrivate) 7730 New->setModulePrivate(); 7731 7732 // If this is a specialization of a member class (of a class template), 7733 // check the specialization. 7734 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7735 Invalid = true; 7736 7737 if (Invalid) 7738 New->setInvalidDecl(); 7739 7740 if (Attr) 7741 ProcessDeclAttributeList(S, New, Attr); 7742 7743 // If we're declaring or defining a tag in function prototype scope 7744 // in C, note that this type can only be used within the function. 7745 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7746 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7747 7748 // Set the lexical context. If the tag has a C++ scope specifier, the 7749 // lexical context will be different from the semantic context. 7750 New->setLexicalDeclContext(CurContext); 7751 7752 // Mark this as a friend decl if applicable. 7753 // In Microsoft mode, a friend declaration also acts as a forward 7754 // declaration so we always pass true to setObjectOfFriendDecl to make 7755 // the tag name visible. 7756 if (TUK == TUK_Friend) 7757 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7758 getLangOptions().Microsoft); 7759 7760 // Set the access specifier. 7761 if (!Invalid && SearchDC->isRecord()) 7762 SetMemberAccessSpecifier(New, PrevDecl, AS); 7763 7764 if (TUK == TUK_Definition) 7765 New->startDefinition(); 7766 7767 // If this has an identifier, add it to the scope stack. 7768 if (TUK == TUK_Friend) { 7769 // We might be replacing an existing declaration in the lookup tables; 7770 // if so, borrow its access specifier. 7771 if (PrevDecl) 7772 New->setAccess(PrevDecl->getAccess()); 7773 7774 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7775 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7776 if (Name) // can be null along some error paths 7777 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7778 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7779 } else if (Name) { 7780 S = getNonFieldDeclScope(S); 7781 PushOnScopeChains(New, S, !IsForwardReference); 7782 if (IsForwardReference) 7783 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7784 7785 } else { 7786 CurContext->addDecl(New); 7787 } 7788 7789 // If this is the C FILE type, notify the AST context. 7790 if (IdentifierInfo *II = New->getIdentifier()) 7791 if (!New->isInvalidDecl() && 7792 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7793 II->isStr("FILE")) 7794 Context.setFILEDecl(New); 7795 7796 OwnedDecl = true; 7797 return New; 7798} 7799 7800void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7801 AdjustDeclIfTemplate(TagD); 7802 TagDecl *Tag = cast<TagDecl>(TagD); 7803 7804 // Enter the tag context. 7805 PushDeclContext(S, Tag); 7806} 7807 7808void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7809 assert(isa<ObjCContainerDecl>(IDecl) && 7810 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7811 DeclContext *OCD = cast<DeclContext>(IDecl); 7812 assert(getContainingDC(OCD) == CurContext && 7813 "The next DeclContext should be lexically contained in the current one."); 7814 CurContext = OCD; 7815} 7816 7817void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7818 SourceLocation FinalLoc, 7819 SourceLocation LBraceLoc) { 7820 AdjustDeclIfTemplate(TagD); 7821 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7822 7823 FieldCollector->StartClass(); 7824 7825 if (!Record->getIdentifier()) 7826 return; 7827 7828 if (FinalLoc.isValid()) 7829 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7830 7831 // C++ [class]p2: 7832 // [...] The class-name is also inserted into the scope of the 7833 // class itself; this is known as the injected-class-name. For 7834 // purposes of access checking, the injected-class-name is treated 7835 // as if it were a public member name. 7836 CXXRecordDecl *InjectedClassName 7837 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7838 Record->getLocStart(), Record->getLocation(), 7839 Record->getIdentifier(), 7840 /*PrevDecl=*/0, 7841 /*DelayTypeCreation=*/true); 7842 Context.getTypeDeclType(InjectedClassName, Record); 7843 InjectedClassName->setImplicit(); 7844 InjectedClassName->setAccess(AS_public); 7845 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7846 InjectedClassName->setDescribedClassTemplate(Template); 7847 PushOnScopeChains(InjectedClassName, S); 7848 assert(InjectedClassName->isInjectedClassName() && 7849 "Broken injected-class-name"); 7850} 7851 7852void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7853 SourceLocation RBraceLoc) { 7854 AdjustDeclIfTemplate(TagD); 7855 TagDecl *Tag = cast<TagDecl>(TagD); 7856 Tag->setRBraceLoc(RBraceLoc); 7857 7858 if (isa<CXXRecordDecl>(Tag)) 7859 FieldCollector->FinishClass(); 7860 7861 // Exit this scope of this tag's definition. 7862 PopDeclContext(); 7863 7864 // Notify the consumer that we've defined a tag. 7865 Consumer.HandleTagDeclDefinition(Tag); 7866} 7867 7868void Sema::ActOnObjCContainerFinishDefinition() { 7869 // Exit this scope of this interface definition. 7870 PopDeclContext(); 7871} 7872 7873void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7874 AdjustDeclIfTemplate(TagD); 7875 TagDecl *Tag = cast<TagDecl>(TagD); 7876 Tag->setInvalidDecl(); 7877 7878 // We're undoing ActOnTagStartDefinition here, not 7879 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7880 // the FieldCollector. 7881 7882 PopDeclContext(); 7883} 7884 7885// Note that FieldName may be null for anonymous bitfields. 7886bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7887 QualType FieldTy, const Expr *BitWidth, 7888 bool *ZeroWidth) { 7889 // Default to true; that shouldn't confuse checks for emptiness 7890 if (ZeroWidth) 7891 *ZeroWidth = true; 7892 7893 // C99 6.7.2.1p4 - verify the field type. 7894 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7895 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7896 // Handle incomplete types with specific error. 7897 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7898 return true; 7899 if (FieldName) 7900 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7901 << FieldName << FieldTy << BitWidth->getSourceRange(); 7902 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7903 << FieldTy << BitWidth->getSourceRange(); 7904 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7905 UPPC_BitFieldWidth)) 7906 return true; 7907 7908 // If the bit-width is type- or value-dependent, don't try to check 7909 // it now. 7910 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7911 return false; 7912 7913 llvm::APSInt Value; 7914 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7915 return true; 7916 7917 if (Value != 0 && ZeroWidth) 7918 *ZeroWidth = false; 7919 7920 // Zero-width bitfield is ok for anonymous field. 7921 if (Value == 0 && FieldName) 7922 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7923 7924 if (Value.isSigned() && Value.isNegative()) { 7925 if (FieldName) 7926 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7927 << FieldName << Value.toString(10); 7928 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7929 << Value.toString(10); 7930 } 7931 7932 if (!FieldTy->isDependentType()) { 7933 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7934 if (Value.getZExtValue() > TypeSize) { 7935 if (!getLangOptions().CPlusPlus) { 7936 if (FieldName) 7937 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7938 << FieldName << (unsigned)Value.getZExtValue() 7939 << (unsigned)TypeSize; 7940 7941 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7942 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7943 } 7944 7945 if (FieldName) 7946 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7947 << FieldName << (unsigned)Value.getZExtValue() 7948 << (unsigned)TypeSize; 7949 else 7950 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7951 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7952 } 7953 } 7954 7955 return false; 7956} 7957 7958/// ActOnField - Each field of a C struct/union is passed into this in order 7959/// to create a FieldDecl object for it. 7960Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 7961 Declarator &D, Expr *BitfieldWidth) { 7962 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7963 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7964 /*HasInit=*/false, AS_public); 7965 return Res; 7966} 7967 7968/// HandleField - Analyze a field of a C struct or a C++ data member. 7969/// 7970FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7971 SourceLocation DeclStart, 7972 Declarator &D, Expr *BitWidth, bool HasInit, 7973 AccessSpecifier AS) { 7974 IdentifierInfo *II = D.getIdentifier(); 7975 SourceLocation Loc = DeclStart; 7976 if (II) Loc = D.getIdentifierLoc(); 7977 7978 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7979 QualType T = TInfo->getType(); 7980 if (getLangOptions().CPlusPlus) { 7981 CheckExtraCXXDefaultArguments(D); 7982 7983 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7984 UPPC_DataMemberType)) { 7985 D.setInvalidType(); 7986 T = Context.IntTy; 7987 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7988 } 7989 } 7990 7991 DiagnoseFunctionSpecifiers(D); 7992 7993 if (D.getDeclSpec().isThreadSpecified()) 7994 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7995 if (D.getDeclSpec().isConstexprSpecified()) 7996 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7997 << 2; 7998 7999 // Check to see if this name was declared as a member previously 8000 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8001 LookupName(Previous, S); 8002 assert((Previous.empty() || Previous.isOverloadedResult() || 8003 Previous.isSingleResult()) 8004 && "Lookup of member name should be either overloaded, single or null"); 8005 8006 // If the name is overloaded then get any declaration else get the single result 8007 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8008 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8009 8010 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8011 // Maybe we will complain about the shadowed template parameter. 8012 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8013 // Just pretend that we didn't see the previous declaration. 8014 PrevDecl = 0; 8015 } 8016 8017 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8018 PrevDecl = 0; 8019 8020 bool Mutable 8021 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8022 SourceLocation TSSL = D.getSourceRange().getBegin(); 8023 FieldDecl *NewFD 8024 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8025 TSSL, AS, PrevDecl, &D); 8026 8027 if (NewFD->isInvalidDecl()) 8028 Record->setInvalidDecl(); 8029 8030 if (NewFD->isInvalidDecl() && PrevDecl) { 8031 // Don't introduce NewFD into scope; there's already something 8032 // with the same name in the same scope. 8033 } else if (II) { 8034 PushOnScopeChains(NewFD, S); 8035 } else 8036 Record->addDecl(NewFD); 8037 8038 return NewFD; 8039} 8040 8041/// \brief Build a new FieldDecl and check its well-formedness. 8042/// 8043/// This routine builds a new FieldDecl given the fields name, type, 8044/// record, etc. \p PrevDecl should refer to any previous declaration 8045/// with the same name and in the same scope as the field to be 8046/// created. 8047/// 8048/// \returns a new FieldDecl. 8049/// 8050/// \todo The Declarator argument is a hack. It will be removed once 8051FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8052 TypeSourceInfo *TInfo, 8053 RecordDecl *Record, SourceLocation Loc, 8054 bool Mutable, Expr *BitWidth, bool HasInit, 8055 SourceLocation TSSL, 8056 AccessSpecifier AS, NamedDecl *PrevDecl, 8057 Declarator *D) { 8058 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8059 bool InvalidDecl = false; 8060 if (D) InvalidDecl = D->isInvalidType(); 8061 8062 // If we receive a broken type, recover by assuming 'int' and 8063 // marking this declaration as invalid. 8064 if (T.isNull()) { 8065 InvalidDecl = true; 8066 T = Context.IntTy; 8067 } 8068 8069 QualType EltTy = Context.getBaseElementType(T); 8070 if (!EltTy->isDependentType() && 8071 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8072 // Fields of incomplete type force their record to be invalid. 8073 Record->setInvalidDecl(); 8074 InvalidDecl = true; 8075 } 8076 8077 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8078 // than a variably modified type. 8079 if (!InvalidDecl && T->isVariablyModifiedType()) { 8080 bool SizeIsNegative; 8081 llvm::APSInt Oversized; 8082 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8083 SizeIsNegative, 8084 Oversized); 8085 if (!FixedTy.isNull()) { 8086 Diag(Loc, diag::warn_illegal_constant_array_size); 8087 T = FixedTy; 8088 } else { 8089 if (SizeIsNegative) 8090 Diag(Loc, diag::err_typecheck_negative_array_size); 8091 else if (Oversized.getBoolValue()) 8092 Diag(Loc, diag::err_array_too_large) 8093 << Oversized.toString(10); 8094 else 8095 Diag(Loc, diag::err_typecheck_field_variable_size); 8096 InvalidDecl = true; 8097 } 8098 } 8099 8100 // Fields can not have abstract class types 8101 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8102 diag::err_abstract_type_in_decl, 8103 AbstractFieldType)) 8104 InvalidDecl = true; 8105 8106 bool ZeroWidth = false; 8107 // If this is declared as a bit-field, check the bit-field. 8108 if (!InvalidDecl && BitWidth && 8109 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8110 InvalidDecl = true; 8111 BitWidth = 0; 8112 ZeroWidth = false; 8113 } 8114 8115 // Check that 'mutable' is consistent with the type of the declaration. 8116 if (!InvalidDecl && Mutable) { 8117 unsigned DiagID = 0; 8118 if (T->isReferenceType()) 8119 DiagID = diag::err_mutable_reference; 8120 else if (T.isConstQualified()) 8121 DiagID = diag::err_mutable_const; 8122 8123 if (DiagID) { 8124 SourceLocation ErrLoc = Loc; 8125 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8126 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8127 Diag(ErrLoc, DiagID); 8128 Mutable = false; 8129 InvalidDecl = true; 8130 } 8131 } 8132 8133 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8134 BitWidth, Mutable, HasInit); 8135 if (InvalidDecl) 8136 NewFD->setInvalidDecl(); 8137 8138 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8139 Diag(Loc, diag::err_duplicate_member) << II; 8140 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8141 NewFD->setInvalidDecl(); 8142 } 8143 8144 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8145 if (Record->isUnion()) { 8146 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8147 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8148 if (RDecl->getDefinition()) { 8149 // C++ [class.union]p1: An object of a class with a non-trivial 8150 // constructor, a non-trivial copy constructor, a non-trivial 8151 // destructor, or a non-trivial copy assignment operator 8152 // cannot be a member of a union, nor can an array of such 8153 // objects. 8154 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8155 NewFD->setInvalidDecl(); 8156 } 8157 } 8158 8159 // C++ [class.union]p1: If a union contains a member of reference type, 8160 // the program is ill-formed. 8161 if (EltTy->isReferenceType()) { 8162 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8163 << NewFD->getDeclName() << EltTy; 8164 NewFD->setInvalidDecl(); 8165 } 8166 } 8167 } 8168 8169 // FIXME: We need to pass in the attributes given an AST 8170 // representation, not a parser representation. 8171 if (D) 8172 // FIXME: What to pass instead of TUScope? 8173 ProcessDeclAttributes(TUScope, NewFD, *D); 8174 8175 // In auto-retain/release, infer strong retension for fields of 8176 // retainable type. 8177 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8178 NewFD->setInvalidDecl(); 8179 8180 if (T.isObjCGCWeak()) 8181 Diag(Loc, diag::warn_attribute_weak_on_field); 8182 8183 NewFD->setAccess(AS); 8184 return NewFD; 8185} 8186 8187bool Sema::CheckNontrivialField(FieldDecl *FD) { 8188 assert(FD); 8189 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8190 8191 if (FD->isInvalidDecl()) 8192 return true; 8193 8194 QualType EltTy = Context.getBaseElementType(FD->getType()); 8195 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8196 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8197 if (RDecl->getDefinition()) { 8198 // We check for copy constructors before constructors 8199 // because otherwise we'll never get complaints about 8200 // copy constructors. 8201 8202 CXXSpecialMember member = CXXInvalid; 8203 if (!RDecl->hasTrivialCopyConstructor()) 8204 member = CXXCopyConstructor; 8205 else if (!RDecl->hasTrivialDefaultConstructor()) 8206 member = CXXDefaultConstructor; 8207 else if (!RDecl->hasTrivialCopyAssignment()) 8208 member = CXXCopyAssignment; 8209 else if (!RDecl->hasTrivialDestructor()) 8210 member = CXXDestructor; 8211 8212 if (member != CXXInvalid) { 8213 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8214 // Objective-C++ ARC: it is an error to have a non-trivial field of 8215 // a union. However, system headers in Objective-C programs 8216 // occasionally have Objective-C lifetime objects within unions, 8217 // and rather than cause the program to fail, we make those 8218 // members unavailable. 8219 SourceLocation Loc = FD->getLocation(); 8220 if (getSourceManager().isInSystemHeader(Loc)) { 8221 if (!FD->hasAttr<UnavailableAttr>()) 8222 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8223 "this system field has retaining ownership")); 8224 return false; 8225 } 8226 } 8227 8228 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8229 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8230 DiagnoseNontrivial(RT, member); 8231 return true; 8232 } 8233 } 8234 } 8235 8236 return false; 8237} 8238 8239/// DiagnoseNontrivial - Given that a class has a non-trivial 8240/// special member, figure out why. 8241void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8242 QualType QT(T, 0U); 8243 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8244 8245 // Check whether the member was user-declared. 8246 switch (member) { 8247 case CXXInvalid: 8248 break; 8249 8250 case CXXDefaultConstructor: 8251 if (RD->hasUserDeclaredConstructor()) { 8252 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8253 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8254 const FunctionDecl *body = 0; 8255 ci->hasBody(body); 8256 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8257 SourceLocation CtorLoc = ci->getLocation(); 8258 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8259 return; 8260 } 8261 } 8262 8263 assert(0 && "found no user-declared constructors"); 8264 return; 8265 } 8266 break; 8267 8268 case CXXCopyConstructor: 8269 if (RD->hasUserDeclaredCopyConstructor()) { 8270 SourceLocation CtorLoc = 8271 RD->getCopyConstructor(0)->getLocation(); 8272 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8273 return; 8274 } 8275 break; 8276 8277 case CXXMoveConstructor: 8278 if (RD->hasUserDeclaredMoveConstructor()) { 8279 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8280 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8281 return; 8282 } 8283 break; 8284 8285 case CXXCopyAssignment: 8286 if (RD->hasUserDeclaredCopyAssignment()) { 8287 // FIXME: this should use the location of the copy 8288 // assignment, not the type. 8289 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8290 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8291 return; 8292 } 8293 break; 8294 8295 case CXXMoveAssignment: 8296 if (RD->hasUserDeclaredMoveAssignment()) { 8297 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8298 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8299 return; 8300 } 8301 break; 8302 8303 case CXXDestructor: 8304 if (RD->hasUserDeclaredDestructor()) { 8305 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8306 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8307 return; 8308 } 8309 break; 8310 } 8311 8312 typedef CXXRecordDecl::base_class_iterator base_iter; 8313 8314 // Virtual bases and members inhibit trivial copying/construction, 8315 // but not trivial destruction. 8316 if (member != CXXDestructor) { 8317 // Check for virtual bases. vbases includes indirect virtual bases, 8318 // so we just iterate through the direct bases. 8319 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8320 if (bi->isVirtual()) { 8321 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8322 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8323 return; 8324 } 8325 8326 // Check for virtual methods. 8327 typedef CXXRecordDecl::method_iterator meth_iter; 8328 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8329 ++mi) { 8330 if (mi->isVirtual()) { 8331 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8332 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8333 return; 8334 } 8335 } 8336 } 8337 8338 bool (CXXRecordDecl::*hasTrivial)() const; 8339 switch (member) { 8340 case CXXDefaultConstructor: 8341 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8342 case CXXCopyConstructor: 8343 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8344 case CXXCopyAssignment: 8345 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8346 case CXXDestructor: 8347 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8348 default: 8349 assert(0 && "unexpected special member"); return; 8350 } 8351 8352 // Check for nontrivial bases (and recurse). 8353 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8354 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8355 assert(BaseRT && "Don't know how to handle dependent bases"); 8356 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8357 if (!(BaseRecTy->*hasTrivial)()) { 8358 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8359 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8360 DiagnoseNontrivial(BaseRT, member); 8361 return; 8362 } 8363 } 8364 8365 // Check for nontrivial members (and recurse). 8366 typedef RecordDecl::field_iterator field_iter; 8367 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8368 ++fi) { 8369 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8370 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8371 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8372 8373 if (!(EltRD->*hasTrivial)()) { 8374 SourceLocation FLoc = (*fi)->getLocation(); 8375 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8376 DiagnoseNontrivial(EltRT, member); 8377 return; 8378 } 8379 } 8380 8381 if (EltTy->isObjCLifetimeType()) { 8382 switch (EltTy.getObjCLifetime()) { 8383 case Qualifiers::OCL_None: 8384 case Qualifiers::OCL_ExplicitNone: 8385 break; 8386 8387 case Qualifiers::OCL_Autoreleasing: 8388 case Qualifiers::OCL_Weak: 8389 case Qualifiers::OCL_Strong: 8390 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8391 << QT << EltTy.getObjCLifetime(); 8392 return; 8393 } 8394 } 8395 } 8396 8397 assert(0 && "found no explanation for non-trivial member"); 8398} 8399 8400/// TranslateIvarVisibility - Translate visibility from a token ID to an 8401/// AST enum value. 8402static ObjCIvarDecl::AccessControl 8403TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8404 switch (ivarVisibility) { 8405 default: assert(0 && "Unknown visitibility kind"); 8406 case tok::objc_private: return ObjCIvarDecl::Private; 8407 case tok::objc_public: return ObjCIvarDecl::Public; 8408 case tok::objc_protected: return ObjCIvarDecl::Protected; 8409 case tok::objc_package: return ObjCIvarDecl::Package; 8410 } 8411} 8412 8413/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8414/// in order to create an IvarDecl object for it. 8415Decl *Sema::ActOnIvar(Scope *S, 8416 SourceLocation DeclStart, 8417 Declarator &D, Expr *BitfieldWidth, 8418 tok::ObjCKeywordKind Visibility) { 8419 8420 IdentifierInfo *II = D.getIdentifier(); 8421 Expr *BitWidth = (Expr*)BitfieldWidth; 8422 SourceLocation Loc = DeclStart; 8423 if (II) Loc = D.getIdentifierLoc(); 8424 8425 // FIXME: Unnamed fields can be handled in various different ways, for 8426 // example, unnamed unions inject all members into the struct namespace! 8427 8428 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8429 QualType T = TInfo->getType(); 8430 8431 if (BitWidth) { 8432 // 6.7.2.1p3, 6.7.2.1p4 8433 if (VerifyBitField(Loc, II, T, BitWidth)) { 8434 D.setInvalidType(); 8435 BitWidth = 0; 8436 } 8437 } else { 8438 // Not a bitfield. 8439 8440 // validate II. 8441 8442 } 8443 if (T->isReferenceType()) { 8444 Diag(Loc, diag::err_ivar_reference_type); 8445 D.setInvalidType(); 8446 } 8447 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8448 // than a variably modified type. 8449 else if (T->isVariablyModifiedType()) { 8450 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8451 D.setInvalidType(); 8452 } 8453 8454 // Get the visibility (access control) for this ivar. 8455 ObjCIvarDecl::AccessControl ac = 8456 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8457 : ObjCIvarDecl::None; 8458 // Must set ivar's DeclContext to its enclosing interface. 8459 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8460 ObjCContainerDecl *EnclosingContext; 8461 if (ObjCImplementationDecl *IMPDecl = 8462 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8463 if (!LangOpts.ObjCNonFragileABI2) { 8464 // Case of ivar declared in an implementation. Context is that of its class. 8465 EnclosingContext = IMPDecl->getClassInterface(); 8466 assert(EnclosingContext && "Implementation has no class interface!"); 8467 } 8468 else 8469 EnclosingContext = EnclosingDecl; 8470 } else { 8471 if (ObjCCategoryDecl *CDecl = 8472 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8473 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8474 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8475 return 0; 8476 } 8477 } 8478 EnclosingContext = EnclosingDecl; 8479 } 8480 8481 // Construct the decl. 8482 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8483 DeclStart, Loc, II, T, 8484 TInfo, ac, (Expr *)BitfieldWidth); 8485 8486 if (II) { 8487 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8488 ForRedeclaration); 8489 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8490 && !isa<TagDecl>(PrevDecl)) { 8491 Diag(Loc, diag::err_duplicate_member) << II; 8492 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8493 NewID->setInvalidDecl(); 8494 } 8495 } 8496 8497 // Process attributes attached to the ivar. 8498 ProcessDeclAttributes(S, NewID, D); 8499 8500 if (D.isInvalidType()) 8501 NewID->setInvalidDecl(); 8502 8503 // In ARC, infer 'retaining' for ivars of retainable type. 8504 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8505 NewID->setInvalidDecl(); 8506 8507 if (II) { 8508 // FIXME: When interfaces are DeclContexts, we'll need to add 8509 // these to the interface. 8510 S->AddDecl(NewID); 8511 IdResolver.AddDecl(NewID); 8512 } 8513 8514 return NewID; 8515} 8516 8517/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8518/// class and class extensions. For every class @interface and class 8519/// extension @interface, if the last ivar is a bitfield of any type, 8520/// then add an implicit `char :0` ivar to the end of that interface. 8521void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8522 SmallVectorImpl<Decl *> &AllIvarDecls) { 8523 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8524 return; 8525 8526 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8527 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8528 8529 if (!Ivar->isBitField()) 8530 return; 8531 uint64_t BitFieldSize = 8532 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8533 if (BitFieldSize == 0) 8534 return; 8535 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8536 if (!ID) { 8537 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8538 if (!CD->IsClassExtension()) 8539 return; 8540 } 8541 // No need to add this to end of @implementation. 8542 else 8543 return; 8544 } 8545 // All conditions are met. Add a new bitfield to the tail end of ivars. 8546 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8547 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8548 8549 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8550 DeclLoc, DeclLoc, 0, 8551 Context.CharTy, 8552 Context.getTrivialTypeSourceInfo(Context.CharTy, 8553 DeclLoc), 8554 ObjCIvarDecl::Private, BW, 8555 true); 8556 AllIvarDecls.push_back(Ivar); 8557} 8558 8559void Sema::ActOnFields(Scope* S, 8560 SourceLocation RecLoc, Decl *EnclosingDecl, 8561 Decl **Fields, unsigned NumFields, 8562 SourceLocation LBrac, SourceLocation RBrac, 8563 AttributeList *Attr) { 8564 assert(EnclosingDecl && "missing record or interface decl"); 8565 8566 // If the decl this is being inserted into is invalid, then it may be a 8567 // redeclaration or some other bogus case. Don't try to add fields to it. 8568 if (EnclosingDecl->isInvalidDecl()) { 8569 // FIXME: Deallocate fields? 8570 return; 8571 } 8572 8573 8574 // Verify that all the fields are okay. 8575 unsigned NumNamedMembers = 0; 8576 SmallVector<FieldDecl*, 32> RecFields; 8577 8578 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8579 bool ARCErrReported = false; 8580 for (unsigned i = 0; i != NumFields; ++i) { 8581 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8582 8583 // Get the type for the field. 8584 const Type *FDTy = FD->getType().getTypePtr(); 8585 8586 if (!FD->isAnonymousStructOrUnion()) { 8587 // Remember all fields written by the user. 8588 RecFields.push_back(FD); 8589 } 8590 8591 // If the field is already invalid for some reason, don't emit more 8592 // diagnostics about it. 8593 if (FD->isInvalidDecl()) { 8594 EnclosingDecl->setInvalidDecl(); 8595 continue; 8596 } 8597 8598 // C99 6.7.2.1p2: 8599 // A structure or union shall not contain a member with 8600 // incomplete or function type (hence, a structure shall not 8601 // contain an instance of itself, but may contain a pointer to 8602 // an instance of itself), except that the last member of a 8603 // structure with more than one named member may have incomplete 8604 // array type; such a structure (and any union containing, 8605 // possibly recursively, a member that is such a structure) 8606 // shall not be a member of a structure or an element of an 8607 // array. 8608 if (FDTy->isFunctionType()) { 8609 // Field declared as a function. 8610 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8611 << FD->getDeclName(); 8612 FD->setInvalidDecl(); 8613 EnclosingDecl->setInvalidDecl(); 8614 continue; 8615 } else if (FDTy->isIncompleteArrayType() && Record && 8616 ((i == NumFields - 1 && !Record->isUnion()) || 8617 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8618 (i == NumFields - 1 || Record->isUnion())))) { 8619 // Flexible array member. 8620 // Microsoft and g++ is more permissive regarding flexible array. 8621 // It will accept flexible array in union and also 8622 // as the sole element of a struct/class. 8623 if (getLangOptions().Microsoft) { 8624 if (Record->isUnion()) 8625 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8626 << FD->getDeclName(); 8627 else if (NumFields == 1) 8628 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8629 << FD->getDeclName() << Record->getTagKind(); 8630 } else if (getLangOptions().CPlusPlus) { 8631 if (Record->isUnion()) 8632 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8633 << FD->getDeclName(); 8634 else if (NumFields == 1) 8635 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8636 << FD->getDeclName() << Record->getTagKind(); 8637 } else if (NumNamedMembers < 1) { 8638 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8639 << FD->getDeclName(); 8640 FD->setInvalidDecl(); 8641 EnclosingDecl->setInvalidDecl(); 8642 continue; 8643 } 8644 if (!FD->getType()->isDependentType() && 8645 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8646 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8647 << FD->getDeclName() << FD->getType(); 8648 FD->setInvalidDecl(); 8649 EnclosingDecl->setInvalidDecl(); 8650 continue; 8651 } 8652 // Okay, we have a legal flexible array member at the end of the struct. 8653 if (Record) 8654 Record->setHasFlexibleArrayMember(true); 8655 } else if (!FDTy->isDependentType() && 8656 RequireCompleteType(FD->getLocation(), FD->getType(), 8657 diag::err_field_incomplete)) { 8658 // Incomplete type 8659 FD->setInvalidDecl(); 8660 EnclosingDecl->setInvalidDecl(); 8661 continue; 8662 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8663 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8664 // If this is a member of a union, then entire union becomes "flexible". 8665 if (Record && Record->isUnion()) { 8666 Record->setHasFlexibleArrayMember(true); 8667 } else { 8668 // If this is a struct/class and this is not the last element, reject 8669 // it. Note that GCC supports variable sized arrays in the middle of 8670 // structures. 8671 if (i != NumFields-1) 8672 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8673 << FD->getDeclName() << FD->getType(); 8674 else { 8675 // We support flexible arrays at the end of structs in 8676 // other structs as an extension. 8677 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8678 << FD->getDeclName(); 8679 if (Record) 8680 Record->setHasFlexibleArrayMember(true); 8681 } 8682 } 8683 } 8684 if (Record && FDTTy->getDecl()->hasObjectMember()) 8685 Record->setHasObjectMember(true); 8686 } else if (FDTy->isObjCObjectType()) { 8687 /// A field cannot be an Objective-c object 8688 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8689 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8690 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8691 FD->setType(T); 8692 } 8693 else if (!getLangOptions().CPlusPlus) { 8694 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8695 // It's an error in ARC if a field has lifetime. 8696 // We don't want to report this in a system header, though, 8697 // so we just make the field unavailable. 8698 // FIXME: that's really not sufficient; we need to make the type 8699 // itself invalid to, say, initialize or copy. 8700 QualType T = FD->getType(); 8701 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8702 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8703 SourceLocation loc = FD->getLocation(); 8704 if (getSourceManager().isInSystemHeader(loc)) { 8705 if (!FD->hasAttr<UnavailableAttr>()) { 8706 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8707 "this system field has retaining ownership")); 8708 } 8709 } else { 8710 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8711 } 8712 ARCErrReported = true; 8713 } 8714 } 8715 else if (getLangOptions().ObjC1 && 8716 getLangOptions().getGCMode() != LangOptions::NonGC && 8717 Record && !Record->hasObjectMember()) { 8718 if (FD->getType()->isObjCObjectPointerType() || 8719 FD->getType().isObjCGCStrong()) 8720 Record->setHasObjectMember(true); 8721 else if (Context.getAsArrayType(FD->getType())) { 8722 QualType BaseType = Context.getBaseElementType(FD->getType()); 8723 if (BaseType->isRecordType() && 8724 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8725 Record->setHasObjectMember(true); 8726 else if (BaseType->isObjCObjectPointerType() || 8727 BaseType.isObjCGCStrong()) 8728 Record->setHasObjectMember(true); 8729 } 8730 } 8731 } 8732 // Keep track of the number of named members. 8733 if (FD->getIdentifier()) 8734 ++NumNamedMembers; 8735 } 8736 8737 // Okay, we successfully defined 'Record'. 8738 if (Record) { 8739 bool Completed = false; 8740 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8741 if (!CXXRecord->isInvalidDecl()) { 8742 // Set access bits correctly on the directly-declared conversions. 8743 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8744 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8745 I != E; ++I) 8746 Convs->setAccess(I, (*I)->getAccess()); 8747 8748 if (!CXXRecord->isDependentType()) { 8749 // Objective-C Automatic Reference Counting: 8750 // If a class has a non-static data member of Objective-C pointer 8751 // type (or array thereof), it is a non-POD type and its 8752 // default constructor (if any), copy constructor, copy assignment 8753 // operator, and destructor are non-trivial. 8754 // 8755 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8756 // However, here we check whether this particular class is only 8757 // non-POD because of the presence of an Objective-C pointer member. 8758 // If so, objects of this type cannot be shared between code compiled 8759 // with instant objects and code compiled with manual retain/release. 8760 if (getLangOptions().ObjCAutoRefCount && 8761 CXXRecord->hasObjectMember() && 8762 CXXRecord->getLinkage() == ExternalLinkage) { 8763 if (CXXRecord->isPOD()) { 8764 Diag(CXXRecord->getLocation(), 8765 diag::warn_arc_non_pod_class_with_object_member) 8766 << CXXRecord; 8767 } else { 8768 // FIXME: Fix-Its would be nice here, but finding a good location 8769 // for them is going to be tricky. 8770 if (CXXRecord->hasTrivialCopyConstructor()) 8771 Diag(CXXRecord->getLocation(), 8772 diag::warn_arc_trivial_member_function_with_object_member) 8773 << CXXRecord << 0; 8774 if (CXXRecord->hasTrivialCopyAssignment()) 8775 Diag(CXXRecord->getLocation(), 8776 diag::warn_arc_trivial_member_function_with_object_member) 8777 << CXXRecord << 1; 8778 if (CXXRecord->hasTrivialDestructor()) 8779 Diag(CXXRecord->getLocation(), 8780 diag::warn_arc_trivial_member_function_with_object_member) 8781 << CXXRecord << 2; 8782 } 8783 } 8784 8785 // Adjust user-defined destructor exception spec. 8786 if (getLangOptions().CPlusPlus0x && 8787 CXXRecord->hasUserDeclaredDestructor()) 8788 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8789 8790 // Add any implicitly-declared members to this class. 8791 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8792 8793 // If we have virtual base classes, we may end up finding multiple 8794 // final overriders for a given virtual function. Check for this 8795 // problem now. 8796 if (CXXRecord->getNumVBases()) { 8797 CXXFinalOverriderMap FinalOverriders; 8798 CXXRecord->getFinalOverriders(FinalOverriders); 8799 8800 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8801 MEnd = FinalOverriders.end(); 8802 M != MEnd; ++M) { 8803 for (OverridingMethods::iterator SO = M->second.begin(), 8804 SOEnd = M->second.end(); 8805 SO != SOEnd; ++SO) { 8806 assert(SO->second.size() > 0 && 8807 "Virtual function without overridding functions?"); 8808 if (SO->second.size() == 1) 8809 continue; 8810 8811 // C++ [class.virtual]p2: 8812 // In a derived class, if a virtual member function of a base 8813 // class subobject has more than one final overrider the 8814 // program is ill-formed. 8815 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8816 << (NamedDecl *)M->first << Record; 8817 Diag(M->first->getLocation(), 8818 diag::note_overridden_virtual_function); 8819 for (OverridingMethods::overriding_iterator 8820 OM = SO->second.begin(), 8821 OMEnd = SO->second.end(); 8822 OM != OMEnd; ++OM) 8823 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8824 << (NamedDecl *)M->first << OM->Method->getParent(); 8825 8826 Record->setInvalidDecl(); 8827 } 8828 } 8829 CXXRecord->completeDefinition(&FinalOverriders); 8830 Completed = true; 8831 } 8832 } 8833 } 8834 } 8835 8836 if (!Completed) 8837 Record->completeDefinition(); 8838 8839 // Now that the record is complete, do any delayed exception spec checks 8840 // we were missing. 8841 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8842 const CXXDestructorDecl *Dtor = 8843 DelayedDestructorExceptionSpecChecks.back().first; 8844 if (Dtor->getParent() != Record) 8845 break; 8846 8847 assert(!Dtor->getParent()->isDependentType() && 8848 "Should not ever add destructors of templates into the list."); 8849 CheckOverridingFunctionExceptionSpec(Dtor, 8850 DelayedDestructorExceptionSpecChecks.back().second); 8851 DelayedDestructorExceptionSpecChecks.pop_back(); 8852 } 8853 8854 } else { 8855 ObjCIvarDecl **ClsFields = 8856 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8857 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8858 ID->setLocEnd(RBrac); 8859 // Add ivar's to class's DeclContext. 8860 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8861 ClsFields[i]->setLexicalDeclContext(ID); 8862 ID->addDecl(ClsFields[i]); 8863 } 8864 // Must enforce the rule that ivars in the base classes may not be 8865 // duplicates. 8866 if (ID->getSuperClass()) 8867 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8868 } else if (ObjCImplementationDecl *IMPDecl = 8869 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8870 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8871 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8872 // Ivar declared in @implementation never belongs to the implementation. 8873 // Only it is in implementation's lexical context. 8874 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8875 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8876 } else if (ObjCCategoryDecl *CDecl = 8877 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8878 // case of ivars in class extension; all other cases have been 8879 // reported as errors elsewhere. 8880 // FIXME. Class extension does not have a LocEnd field. 8881 // CDecl->setLocEnd(RBrac); 8882 // Add ivar's to class extension's DeclContext. 8883 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8884 ClsFields[i]->setLexicalDeclContext(CDecl); 8885 CDecl->addDecl(ClsFields[i]); 8886 } 8887 } 8888 } 8889 8890 if (Attr) 8891 ProcessDeclAttributeList(S, Record, Attr); 8892 8893 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8894 // set the visibility of this record. 8895 if (Record && !Record->getDeclContext()->isRecord()) 8896 AddPushedVisibilityAttribute(Record); 8897} 8898 8899/// \brief Determine whether the given integral value is representable within 8900/// the given type T. 8901static bool isRepresentableIntegerValue(ASTContext &Context, 8902 llvm::APSInt &Value, 8903 QualType T) { 8904 assert(T->isIntegralType(Context) && "Integral type required!"); 8905 unsigned BitWidth = Context.getIntWidth(T); 8906 8907 if (Value.isUnsigned() || Value.isNonNegative()) { 8908 if (T->isSignedIntegerOrEnumerationType()) 8909 --BitWidth; 8910 return Value.getActiveBits() <= BitWidth; 8911 } 8912 return Value.getMinSignedBits() <= BitWidth; 8913} 8914 8915// \brief Given an integral type, return the next larger integral type 8916// (or a NULL type of no such type exists). 8917static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8918 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8919 // enum checking below. 8920 assert(T->isIntegralType(Context) && "Integral type required!"); 8921 const unsigned NumTypes = 4; 8922 QualType SignedIntegralTypes[NumTypes] = { 8923 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8924 }; 8925 QualType UnsignedIntegralTypes[NumTypes] = { 8926 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8927 Context.UnsignedLongLongTy 8928 }; 8929 8930 unsigned BitWidth = Context.getTypeSize(T); 8931 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8932 : UnsignedIntegralTypes; 8933 for (unsigned I = 0; I != NumTypes; ++I) 8934 if (Context.getTypeSize(Types[I]) > BitWidth) 8935 return Types[I]; 8936 8937 return QualType(); 8938} 8939 8940EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8941 EnumConstantDecl *LastEnumConst, 8942 SourceLocation IdLoc, 8943 IdentifierInfo *Id, 8944 Expr *Val) { 8945 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 8946 llvm::APSInt EnumVal(IntWidth); 8947 QualType EltTy; 8948 8949 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8950 Val = 0; 8951 8952 if (Val) { 8953 if (Enum->isDependentType() || Val->isTypeDependent()) 8954 EltTy = Context.DependentTy; 8955 else { 8956 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8957 SourceLocation ExpLoc; 8958 if (!Val->isValueDependent() && 8959 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8960 Val = 0; 8961 } else { 8962 if (!getLangOptions().CPlusPlus) { 8963 // C99 6.7.2.2p2: 8964 // The expression that defines the value of an enumeration constant 8965 // shall be an integer constant expression that has a value 8966 // representable as an int. 8967 8968 // Complain if the value is not representable in an int. 8969 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8970 Diag(IdLoc, diag::ext_enum_value_not_int) 8971 << EnumVal.toString(10) << Val->getSourceRange() 8972 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8973 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8974 // Force the type of the expression to 'int'. 8975 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8976 } 8977 } 8978 8979 if (Enum->isFixed()) { 8980 EltTy = Enum->getIntegerType(); 8981 8982 // C++0x [dcl.enum]p5: 8983 // ... if the initializing value of an enumerator cannot be 8984 // represented by the underlying type, the program is ill-formed. 8985 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8986 if (getLangOptions().Microsoft) { 8987 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8988 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8989 } else 8990 Diag(IdLoc, diag::err_enumerator_too_large) 8991 << EltTy; 8992 } else 8993 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8994 } 8995 else { 8996 // C++0x [dcl.enum]p5: 8997 // If the underlying type is not fixed, the type of each enumerator 8998 // is the type of its initializing value: 8999 // - If an initializer is specified for an enumerator, the 9000 // initializing value has the same type as the expression. 9001 EltTy = Val->getType(); 9002 } 9003 } 9004 } 9005 } 9006 9007 if (!Val) { 9008 if (Enum->isDependentType()) 9009 EltTy = Context.DependentTy; 9010 else if (!LastEnumConst) { 9011 // C++0x [dcl.enum]p5: 9012 // If the underlying type is not fixed, the type of each enumerator 9013 // is the type of its initializing value: 9014 // - If no initializer is specified for the first enumerator, the 9015 // initializing value has an unspecified integral type. 9016 // 9017 // GCC uses 'int' for its unspecified integral type, as does 9018 // C99 6.7.2.2p3. 9019 if (Enum->isFixed()) { 9020 EltTy = Enum->getIntegerType(); 9021 } 9022 else { 9023 EltTy = Context.IntTy; 9024 } 9025 } else { 9026 // Assign the last value + 1. 9027 EnumVal = LastEnumConst->getInitVal(); 9028 ++EnumVal; 9029 EltTy = LastEnumConst->getType(); 9030 9031 // Check for overflow on increment. 9032 if (EnumVal < LastEnumConst->getInitVal()) { 9033 // C++0x [dcl.enum]p5: 9034 // If the underlying type is not fixed, the type of each enumerator 9035 // is the type of its initializing value: 9036 // 9037 // - Otherwise the type of the initializing value is the same as 9038 // the type of the initializing value of the preceding enumerator 9039 // unless the incremented value is not representable in that type, 9040 // in which case the type is an unspecified integral type 9041 // sufficient to contain the incremented value. If no such type 9042 // exists, the program is ill-formed. 9043 QualType T = getNextLargerIntegralType(Context, EltTy); 9044 if (T.isNull() || Enum->isFixed()) { 9045 // There is no integral type larger enough to represent this 9046 // value. Complain, then allow the value to wrap around. 9047 EnumVal = LastEnumConst->getInitVal(); 9048 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9049 ++EnumVal; 9050 if (Enum->isFixed()) 9051 // When the underlying type is fixed, this is ill-formed. 9052 Diag(IdLoc, diag::err_enumerator_wrapped) 9053 << EnumVal.toString(10) 9054 << EltTy; 9055 else 9056 Diag(IdLoc, diag::warn_enumerator_too_large) 9057 << EnumVal.toString(10); 9058 } else { 9059 EltTy = T; 9060 } 9061 9062 // Retrieve the last enumerator's value, extent that type to the 9063 // type that is supposed to be large enough to represent the incremented 9064 // value, then increment. 9065 EnumVal = LastEnumConst->getInitVal(); 9066 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9067 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9068 ++EnumVal; 9069 9070 // If we're not in C++, diagnose the overflow of enumerator values, 9071 // which in C99 means that the enumerator value is not representable in 9072 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9073 // permits enumerator values that are representable in some larger 9074 // integral type. 9075 if (!getLangOptions().CPlusPlus && !T.isNull()) 9076 Diag(IdLoc, diag::warn_enum_value_overflow); 9077 } else if (!getLangOptions().CPlusPlus && 9078 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9079 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9080 Diag(IdLoc, diag::ext_enum_value_not_int) 9081 << EnumVal.toString(10) << 1; 9082 } 9083 } 9084 } 9085 9086 if (!EltTy->isDependentType()) { 9087 // Make the enumerator value match the signedness and size of the 9088 // enumerator's type. 9089 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9090 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9091 } 9092 9093 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9094 Val, EnumVal); 9095} 9096 9097 9098Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9099 SourceLocation IdLoc, IdentifierInfo *Id, 9100 AttributeList *Attr, 9101 SourceLocation EqualLoc, Expr *val) { 9102 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9103 EnumConstantDecl *LastEnumConst = 9104 cast_or_null<EnumConstantDecl>(lastEnumConst); 9105 Expr *Val = static_cast<Expr*>(val); 9106 9107 // The scope passed in may not be a decl scope. Zip up the scope tree until 9108 // we find one that is. 9109 S = getNonFieldDeclScope(S); 9110 9111 // Verify that there isn't already something declared with this name in this 9112 // scope. 9113 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9114 ForRedeclaration); 9115 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9116 // Maybe we will complain about the shadowed template parameter. 9117 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9118 // Just pretend that we didn't see the previous declaration. 9119 PrevDecl = 0; 9120 } 9121 9122 if (PrevDecl) { 9123 // When in C++, we may get a TagDecl with the same name; in this case the 9124 // enum constant will 'hide' the tag. 9125 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9126 "Received TagDecl when not in C++!"); 9127 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9128 if (isa<EnumConstantDecl>(PrevDecl)) 9129 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9130 else 9131 Diag(IdLoc, diag::err_redefinition) << Id; 9132 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9133 return 0; 9134 } 9135 } 9136 9137 // C++ [class.mem]p13: 9138 // If T is the name of a class, then each of the following shall have a 9139 // name different from T: 9140 // - every enumerator of every member of class T that is an enumerated 9141 // type 9142 if (CXXRecordDecl *Record 9143 = dyn_cast<CXXRecordDecl>( 9144 TheEnumDecl->getDeclContext()->getRedeclContext())) 9145 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9146 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9147 9148 EnumConstantDecl *New = 9149 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9150 9151 if (New) { 9152 // Process attributes. 9153 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9154 9155 // Register this decl in the current scope stack. 9156 New->setAccess(TheEnumDecl->getAccess()); 9157 PushOnScopeChains(New, S); 9158 } 9159 9160 return New; 9161} 9162 9163void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9164 SourceLocation RBraceLoc, Decl *EnumDeclX, 9165 Decl **Elements, unsigned NumElements, 9166 Scope *S, AttributeList *Attr) { 9167 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9168 QualType EnumType = Context.getTypeDeclType(Enum); 9169 9170 if (Attr) 9171 ProcessDeclAttributeList(S, Enum, Attr); 9172 9173 if (Enum->isDependentType()) { 9174 for (unsigned i = 0; i != NumElements; ++i) { 9175 EnumConstantDecl *ECD = 9176 cast_or_null<EnumConstantDecl>(Elements[i]); 9177 if (!ECD) continue; 9178 9179 ECD->setType(EnumType); 9180 } 9181 9182 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9183 return; 9184 } 9185 9186 // TODO: If the result value doesn't fit in an int, it must be a long or long 9187 // long value. ISO C does not support this, but GCC does as an extension, 9188 // emit a warning. 9189 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9190 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9191 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9192 9193 // Verify that all the values are okay, compute the size of the values, and 9194 // reverse the list. 9195 unsigned NumNegativeBits = 0; 9196 unsigned NumPositiveBits = 0; 9197 9198 // Keep track of whether all elements have type int. 9199 bool AllElementsInt = true; 9200 9201 for (unsigned i = 0; i != NumElements; ++i) { 9202 EnumConstantDecl *ECD = 9203 cast_or_null<EnumConstantDecl>(Elements[i]); 9204 if (!ECD) continue; // Already issued a diagnostic. 9205 9206 const llvm::APSInt &InitVal = ECD->getInitVal(); 9207 9208 // Keep track of the size of positive and negative values. 9209 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9210 NumPositiveBits = std::max(NumPositiveBits, 9211 (unsigned)InitVal.getActiveBits()); 9212 else 9213 NumNegativeBits = std::max(NumNegativeBits, 9214 (unsigned)InitVal.getMinSignedBits()); 9215 9216 // Keep track of whether every enum element has type int (very commmon). 9217 if (AllElementsInt) 9218 AllElementsInt = ECD->getType() == Context.IntTy; 9219 } 9220 9221 // Figure out the type that should be used for this enum. 9222 QualType BestType; 9223 unsigned BestWidth; 9224 9225 // C++0x N3000 [conv.prom]p3: 9226 // An rvalue of an unscoped enumeration type whose underlying 9227 // type is not fixed can be converted to an rvalue of the first 9228 // of the following types that can represent all the values of 9229 // the enumeration: int, unsigned int, long int, unsigned long 9230 // int, long long int, or unsigned long long int. 9231 // C99 6.4.4.3p2: 9232 // An identifier declared as an enumeration constant has type int. 9233 // The C99 rule is modified by a gcc extension 9234 QualType BestPromotionType; 9235 9236 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9237 // -fshort-enums is the equivalent to specifying the packed attribute on all 9238 // enum definitions. 9239 if (LangOpts.ShortEnums) 9240 Packed = true; 9241 9242 if (Enum->isFixed()) { 9243 BestType = BestPromotionType = Enum->getIntegerType(); 9244 // We don't need to set BestWidth, because BestType is going to be the type 9245 // of the enumerators, but we do anyway because otherwise some compilers 9246 // warn that it might be used uninitialized. 9247 BestWidth = CharWidth; 9248 } 9249 else if (NumNegativeBits) { 9250 // If there is a negative value, figure out the smallest integer type (of 9251 // int/long/longlong) that fits. 9252 // If it's packed, check also if it fits a char or a short. 9253 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9254 BestType = Context.SignedCharTy; 9255 BestWidth = CharWidth; 9256 } else if (Packed && NumNegativeBits <= ShortWidth && 9257 NumPositiveBits < ShortWidth) { 9258 BestType = Context.ShortTy; 9259 BestWidth = ShortWidth; 9260 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9261 BestType = Context.IntTy; 9262 BestWidth = IntWidth; 9263 } else { 9264 BestWidth = Context.getTargetInfo().getLongWidth(); 9265 9266 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9267 BestType = Context.LongTy; 9268 } else { 9269 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9270 9271 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9272 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9273 BestType = Context.LongLongTy; 9274 } 9275 } 9276 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9277 } else { 9278 // If there is no negative value, figure out the smallest type that fits 9279 // all of the enumerator values. 9280 // If it's packed, check also if it fits a char or a short. 9281 if (Packed && NumPositiveBits <= CharWidth) { 9282 BestType = Context.UnsignedCharTy; 9283 BestPromotionType = Context.IntTy; 9284 BestWidth = CharWidth; 9285 } else if (Packed && NumPositiveBits <= ShortWidth) { 9286 BestType = Context.UnsignedShortTy; 9287 BestPromotionType = Context.IntTy; 9288 BestWidth = ShortWidth; 9289 } else if (NumPositiveBits <= IntWidth) { 9290 BestType = Context.UnsignedIntTy; 9291 BestWidth = IntWidth; 9292 BestPromotionType 9293 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9294 ? Context.UnsignedIntTy : Context.IntTy; 9295 } else if (NumPositiveBits <= 9296 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9297 BestType = Context.UnsignedLongTy; 9298 BestPromotionType 9299 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9300 ? Context.UnsignedLongTy : Context.LongTy; 9301 } else { 9302 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9303 assert(NumPositiveBits <= BestWidth && 9304 "How could an initializer get larger than ULL?"); 9305 BestType = Context.UnsignedLongLongTy; 9306 BestPromotionType 9307 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9308 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9309 } 9310 } 9311 9312 // Loop over all of the enumerator constants, changing their types to match 9313 // the type of the enum if needed. 9314 for (unsigned i = 0; i != NumElements; ++i) { 9315 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9316 if (!ECD) continue; // Already issued a diagnostic. 9317 9318 // Standard C says the enumerators have int type, but we allow, as an 9319 // extension, the enumerators to be larger than int size. If each 9320 // enumerator value fits in an int, type it as an int, otherwise type it the 9321 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9322 // that X has type 'int', not 'unsigned'. 9323 9324 // Determine whether the value fits into an int. 9325 llvm::APSInt InitVal = ECD->getInitVal(); 9326 9327 // If it fits into an integer type, force it. Otherwise force it to match 9328 // the enum decl type. 9329 QualType NewTy; 9330 unsigned NewWidth; 9331 bool NewSign; 9332 if (!getLangOptions().CPlusPlus && 9333 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9334 NewTy = Context.IntTy; 9335 NewWidth = IntWidth; 9336 NewSign = true; 9337 } else if (ECD->getType() == BestType) { 9338 // Already the right type! 9339 if (getLangOptions().CPlusPlus) 9340 // C++ [dcl.enum]p4: Following the closing brace of an 9341 // enum-specifier, each enumerator has the type of its 9342 // enumeration. 9343 ECD->setType(EnumType); 9344 continue; 9345 } else { 9346 NewTy = BestType; 9347 NewWidth = BestWidth; 9348 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9349 } 9350 9351 // Adjust the APSInt value. 9352 InitVal = InitVal.extOrTrunc(NewWidth); 9353 InitVal.setIsSigned(NewSign); 9354 ECD->setInitVal(InitVal); 9355 9356 // Adjust the Expr initializer and type. 9357 if (ECD->getInitExpr() && 9358 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9359 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9360 CK_IntegralCast, 9361 ECD->getInitExpr(), 9362 /*base paths*/ 0, 9363 VK_RValue)); 9364 if (getLangOptions().CPlusPlus) 9365 // C++ [dcl.enum]p4: Following the closing brace of an 9366 // enum-specifier, each enumerator has the type of its 9367 // enumeration. 9368 ECD->setType(EnumType); 9369 else 9370 ECD->setType(NewTy); 9371 } 9372 9373 Enum->completeDefinition(BestType, BestPromotionType, 9374 NumPositiveBits, NumNegativeBits); 9375} 9376 9377Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9378 SourceLocation StartLoc, 9379 SourceLocation EndLoc) { 9380 StringLiteral *AsmString = cast<StringLiteral>(expr); 9381 9382 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9383 AsmString, StartLoc, 9384 EndLoc); 9385 CurContext->addDecl(New); 9386 return New; 9387} 9388 9389DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9390 IdentifierInfo &ModuleName, 9391 SourceLocation ModuleNameLoc) { 9392 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9393 ModuleName, ModuleNameLoc); 9394 if (!Module) 9395 return true; 9396 9397 // FIXME: Actually create a declaration to describe the module import. 9398 (void)Module; 9399 return DeclResult((Decl *)0); 9400} 9401 9402void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9403 SourceLocation PragmaLoc, 9404 SourceLocation NameLoc) { 9405 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9406 9407 if (PrevDecl) { 9408 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9409 } else { 9410 (void)WeakUndeclaredIdentifiers.insert( 9411 std::pair<IdentifierInfo*,WeakInfo> 9412 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9413 } 9414} 9415 9416void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9417 IdentifierInfo* AliasName, 9418 SourceLocation PragmaLoc, 9419 SourceLocation NameLoc, 9420 SourceLocation AliasNameLoc) { 9421 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9422 LookupOrdinaryName); 9423 WeakInfo W = WeakInfo(Name, NameLoc); 9424 9425 if (PrevDecl) { 9426 if (!PrevDecl->hasAttr<AliasAttr>()) 9427 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9428 DeclApplyPragmaWeak(TUScope, ND, W); 9429 } else { 9430 (void)WeakUndeclaredIdentifiers.insert( 9431 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9432 } 9433} 9434 9435Decl *Sema::getObjCDeclContext() const { 9436 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9437} 9438