SemaDecl.cpp revision f09ce394517f950e820623991bbb63d498329cfe
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/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 case LookupResult::FoundOverloaded: 150 case LookupResult::FoundUnresolvedValue: 151 Result.suppressDiagnostics(); 152 return ParsedType(); 153 154 case LookupResult::Ambiguous: 155 // Recover from type-hiding ambiguities by hiding the type. We'll 156 // do the lookup again when looking for an object, and we can 157 // diagnose the error then. If we don't do this, then the error 158 // about hiding the type will be immediately followed by an error 159 // that only makes sense if the identifier was treated like a type. 160 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 161 Result.suppressDiagnostics(); 162 return ParsedType(); 163 } 164 165 // Look to see if we have a type anywhere in the list of results. 166 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 167 Res != ResEnd; ++Res) { 168 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 169 if (!IIDecl || 170 (*Res)->getLocation().getRawEncoding() < 171 IIDecl->getLocation().getRawEncoding()) 172 IIDecl = *Res; 173 } 174 } 175 176 if (!IIDecl) { 177 // None of the entities we found is a type, so there is no way 178 // to even assume that the result is a type. In this case, don't 179 // complain about the ambiguity. The parser will either try to 180 // perform this lookup again (e.g., as an object name), which 181 // will produce the ambiguity, or will complain that it expected 182 // a type name. 183 Result.suppressDiagnostics(); 184 return ParsedType(); 185 } 186 187 // We found a type within the ambiguous lookup; diagnose the 188 // ambiguity and then return that type. This might be the right 189 // answer, or it might not be, but it suppresses any attempt to 190 // perform the name lookup again. 191 break; 192 193 case LookupResult::Found: 194 IIDecl = Result.getFoundDecl(); 195 break; 196 } 197 198 assert(IIDecl && "Didn't find decl"); 199 200 QualType T; 201 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 202 DiagnoseUseOfDecl(IIDecl, NameLoc); 203 204 if (T.isNull()) 205 T = Context.getTypeDeclType(TD); 206 207 if (SS && SS->isNotEmpty()) { 208 if (WantNontrivialTypeSourceInfo) { 209 // Construct a type with type-source information. 210 TypeLocBuilder Builder; 211 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 212 213 T = getElaboratedType(ETK_None, *SS, T); 214 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 215 ElabTL.setKeywordLoc(SourceLocation()); 216 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 217 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 218 } else { 219 T = getElaboratedType(ETK_None, *SS, T); 220 } 221 } 222 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 223 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 224 if (!HasTrailingDot) 225 T = Context.getObjCInterfaceType(IDecl); 226 } 227 228 if (T.isNull()) { 229 // If it's not plausibly a type, suppress diagnostics. 230 Result.suppressDiagnostics(); 231 return ParsedType(); 232 } 233 return ParsedType::make(T); 234} 235 236/// isTagName() - This method is called *for error recovery purposes only* 237/// to determine if the specified name is a valid tag name ("struct foo"). If 238/// so, this returns the TST for the tag corresponding to it (TST_enum, 239/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 240/// where the user forgot to specify the tag. 241DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 242 // Do a tag name lookup in this scope. 243 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 244 LookupName(R, S, false); 245 R.suppressDiagnostics(); 246 if (R.getResultKind() == LookupResult::Found) 247 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 248 switch (TD->getTagKind()) { 249 default: return DeclSpec::TST_unspecified; 250 case TTK_Struct: return DeclSpec::TST_struct; 251 case TTK_Union: return DeclSpec::TST_union; 252 case TTK_Class: return DeclSpec::TST_class; 253 case TTK_Enum: return DeclSpec::TST_enum; 254 } 255 } 256 257 return DeclSpec::TST_unspecified; 258} 259 260/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 261/// if a CXXScopeSpec's type is equal to the type of one of the base classes 262/// then downgrade the missing typename error to a warning. 263/// This is needed for MSVC compatibility; Example: 264/// @code 265/// template<class T> class A { 266/// public: 267/// typedef int TYPE; 268/// }; 269/// template<class T> class B : public A<T> { 270/// public: 271/// A<T>::TYPE a; // no typename required because A<T> is a base class. 272/// }; 273/// @endcode 274bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 275 if (CurContext->isRecord()) { 276 const Type *Ty = SS->getScopeRep()->getAsType(); 277 278 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 279 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 280 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 281 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 282 return true; 283 } 284 return CurContext->isFunctionOrMethod(); 285} 286 287bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 288 SourceLocation IILoc, 289 Scope *S, 290 CXXScopeSpec *SS, 291 ParsedType &SuggestedType) { 292 // We don't have anything to suggest (yet). 293 SuggestedType = ParsedType(); 294 295 // There may have been a typo in the name of the type. Look up typo 296 // results, in case we have something that we can suggest. 297 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 298 LookupOrdinaryName, S, SS, NULL, 299 false, CTC_Type)) { 300 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 301 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 302 303 if (Corrected.isKeyword()) { 304 // We corrected to a keyword. 305 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 306 Diag(IILoc, diag::err_unknown_typename_suggest) 307 << &II << CorrectedQuotedStr; 308 return true; 309 } else { 310 NamedDecl *Result = Corrected.getCorrectionDecl(); 311 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 312 !Result->isInvalidDecl()) { 313 // We found a similarly-named type or interface; suggest that. 314 if (!SS || !SS->isSet()) 315 Diag(IILoc, diag::err_unknown_typename_suggest) 316 << &II << CorrectedQuotedStr 317 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 318 else if (DeclContext *DC = computeDeclContext(*SS, false)) 319 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 320 << &II << DC << CorrectedQuotedStr << SS->getRange() 321 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 322 else 323 llvm_unreachable("could not have corrected a typo here"); 324 325 Diag(Result->getLocation(), diag::note_previous_decl) 326 << CorrectedQuotedStr; 327 328 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 329 false, false, ParsedType(), 330 /*NonTrivialTypeSourceInfo=*/true); 331 return true; 332 } 333 } 334 } 335 336 if (getLangOptions().CPlusPlus) { 337 // See if II is a class template that the user forgot to pass arguments to. 338 UnqualifiedId Name; 339 Name.setIdentifier(&II, IILoc); 340 CXXScopeSpec EmptySS; 341 TemplateTy TemplateResult; 342 bool MemberOfUnknownSpecialization; 343 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 344 Name, ParsedType(), true, TemplateResult, 345 MemberOfUnknownSpecialization) == TNK_Type_template) { 346 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 347 Diag(IILoc, diag::err_template_missing_args) << TplName; 348 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 349 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 350 << TplDecl->getTemplateParameters()->getSourceRange(); 351 } 352 return true; 353 } 354 } 355 356 // FIXME: Should we move the logic that tries to recover from a missing tag 357 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 358 359 if (!SS || (!SS->isSet() && !SS->isInvalid())) 360 Diag(IILoc, diag::err_unknown_typename) << &II; 361 else if (DeclContext *DC = computeDeclContext(*SS, false)) 362 Diag(IILoc, diag::err_typename_nested_not_found) 363 << &II << DC << SS->getRange(); 364 else if (isDependentScopeSpecifier(*SS)) { 365 unsigned DiagID = diag::err_typename_missing; 366 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS)) 367 DiagID = diag::warn_typename_missing; 368 369 Diag(SS->getRange().getBegin(), DiagID) 370 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 371 << SourceRange(SS->getRange().getBegin(), IILoc) 372 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 373 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 374 } else { 375 assert(SS && SS->isInvalid() && 376 "Invalid scope specifier has already been diagnosed"); 377 } 378 379 return true; 380} 381 382/// \brief Determine whether the given result set contains either a type name 383/// or 384static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 385 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 386 NextToken.is(tok::less); 387 388 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 389 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 390 return true; 391 392 if (CheckTemplate && isa<TemplateDecl>(*I)) 393 return true; 394 } 395 396 return false; 397} 398 399Sema::NameClassification Sema::ClassifyName(Scope *S, 400 CXXScopeSpec &SS, 401 IdentifierInfo *&Name, 402 SourceLocation NameLoc, 403 const Token &NextToken) { 404 DeclarationNameInfo NameInfo(Name, NameLoc); 405 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 406 407 if (NextToken.is(tok::coloncolon)) { 408 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 409 QualType(), false, SS, 0, false); 410 411 } 412 413 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 414 LookupParsedName(Result, S, &SS, !CurMethod); 415 416 // Perform lookup for Objective-C instance variables (including automatically 417 // synthesized instance variables), if we're in an Objective-C method. 418 // FIXME: This lookup really, really needs to be folded in to the normal 419 // unqualified lookup mechanism. 420 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 421 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 422 if (E.get() || E.isInvalid()) 423 return E; 424 } 425 426 bool SecondTry = false; 427 bool IsFilteredTemplateName = false; 428 429Corrected: 430 switch (Result.getResultKind()) { 431 case LookupResult::NotFound: 432 // If an unqualified-id is followed by a '(', then we have a function 433 // call. 434 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 435 // In C++, this is an ADL-only call. 436 // FIXME: Reference? 437 if (getLangOptions().CPlusPlus) 438 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 439 440 // C90 6.3.2.2: 441 // If the expression that precedes the parenthesized argument list in a 442 // function call consists solely of an identifier, and if no 443 // declaration is visible for this identifier, the identifier is 444 // implicitly declared exactly as if, in the innermost block containing 445 // the function call, the declaration 446 // 447 // extern int identifier (); 448 // 449 // appeared. 450 // 451 // We also allow this in C99 as an extension. 452 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 453 Result.addDecl(D); 454 Result.resolveKind(); 455 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 456 } 457 } 458 459 // In C, we first see whether there is a tag type by the same name, in 460 // which case it's likely that the user just forget to write "enum", 461 // "struct", or "union". 462 if (!getLangOptions().CPlusPlus && !SecondTry) { 463 Result.clear(LookupTagName); 464 LookupParsedName(Result, S, &SS); 465 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 466 const char *TagName = 0; 467 const char *FixItTagName = 0; 468 switch (Tag->getTagKind()) { 469 case TTK_Class: 470 TagName = "class"; 471 FixItTagName = "class "; 472 break; 473 474 case TTK_Enum: 475 TagName = "enum"; 476 FixItTagName = "enum "; 477 break; 478 479 case TTK_Struct: 480 TagName = "struct"; 481 FixItTagName = "struct "; 482 break; 483 484 case TTK_Union: 485 TagName = "union"; 486 FixItTagName = "union "; 487 break; 488 } 489 490 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 491 << Name << TagName << getLangOptions().CPlusPlus 492 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 493 break; 494 } 495 496 Result.clear(LookupOrdinaryName); 497 } 498 499 // Perform typo correction to determine if there is another name that is 500 // close to this name. 501 if (!SecondTry) { 502 SecondTry = true; 503 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 504 Result.getLookupKind(), S, &SS)) { 505 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 506 unsigned QualifiedDiag = diag::err_no_member_suggest; 507 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 508 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 509 510 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 511 NamedDecl *UnderlyingFirstDecl 512 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 513 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 514 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 515 UnqualifiedDiag = diag::err_no_template_suggest; 516 QualifiedDiag = diag::err_no_member_template_suggest; 517 } else if (UnderlyingFirstDecl && 518 (isa<TypeDecl>(UnderlyingFirstDecl) || 519 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 520 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 521 UnqualifiedDiag = diag::err_unknown_typename_suggest; 522 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 523 } 524 525 if (SS.isEmpty()) 526 Diag(NameLoc, UnqualifiedDiag) 527 << Name << CorrectedQuotedStr 528 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 529 else 530 Diag(NameLoc, QualifiedDiag) 531 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 532 << SS.getRange() 533 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 534 535 // Update the name, so that the caller has the new name. 536 Name = Corrected.getCorrectionAsIdentifierInfo(); 537 538 // Also update the LookupResult... 539 // FIXME: This should probably go away at some point 540 Result.clear(); 541 Result.setLookupName(Corrected.getCorrection()); 542 if (FirstDecl) Result.addDecl(FirstDecl); 543 544 // Typo correction corrected to a keyword. 545 if (Corrected.isKeyword()) 546 return Corrected.getCorrectionAsIdentifierInfo(); 547 548 if (FirstDecl) 549 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 550 << CorrectedQuotedStr; 551 552 // If we found an Objective-C instance variable, let 553 // LookupInObjCMethod build the appropriate expression to 554 // reference the ivar. 555 // FIXME: This is a gross hack. 556 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 557 Result.clear(); 558 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 559 return move(E); 560 } 561 562 goto Corrected; 563 } 564 } 565 566 // We failed to correct; just fall through and let the parser deal with it. 567 Result.suppressDiagnostics(); 568 return NameClassification::Unknown(); 569 570 case LookupResult::NotFoundInCurrentInstantiation: 571 // We performed name lookup into the current instantiation, and there were 572 // dependent bases, so we treat this result the same way as any other 573 // dependent nested-name-specifier. 574 575 // C++ [temp.res]p2: 576 // A name used in a template declaration or definition and that is 577 // dependent on a template-parameter is assumed not to name a type 578 // unless the applicable name lookup finds a type name or the name is 579 // qualified by the keyword typename. 580 // 581 // FIXME: If the next token is '<', we might want to ask the parser to 582 // perform some heroics to see if we actually have a 583 // template-argument-list, which would indicate a missing 'template' 584 // keyword here. 585 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 586 587 case LookupResult::Found: 588 case LookupResult::FoundOverloaded: 589 case LookupResult::FoundUnresolvedValue: 590 break; 591 592 case LookupResult::Ambiguous: 593 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 594 hasAnyAcceptableTemplateNames(Result)) { 595 // C++ [temp.local]p3: 596 // A lookup that finds an injected-class-name (10.2) can result in an 597 // ambiguity in certain cases (for example, if it is found in more than 598 // one base class). If all of the injected-class-names that are found 599 // refer to specializations of the same class template, and if the name 600 // is followed by a template-argument-list, the reference refers to the 601 // class template itself and not a specialization thereof, and is not 602 // ambiguous. 603 // 604 // This filtering can make an ambiguous result into an unambiguous one, 605 // so try again after filtering out template names. 606 FilterAcceptableTemplateNames(Result); 607 if (!Result.isAmbiguous()) { 608 IsFilteredTemplateName = true; 609 break; 610 } 611 } 612 613 // Diagnose the ambiguity and return an error. 614 return NameClassification::Error(); 615 } 616 617 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 618 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 619 // C++ [temp.names]p3: 620 // After name lookup (3.4) finds that a name is a template-name or that 621 // an operator-function-id or a literal- operator-id refers to a set of 622 // overloaded functions any member of which is a function template if 623 // this is followed by a <, the < is always taken as the delimiter of a 624 // template-argument-list and never as the less-than operator. 625 if (!IsFilteredTemplateName) 626 FilterAcceptableTemplateNames(Result); 627 628 if (!Result.empty()) { 629 bool IsFunctionTemplate; 630 TemplateName Template; 631 if (Result.end() - Result.begin() > 1) { 632 IsFunctionTemplate = true; 633 Template = Context.getOverloadedTemplateName(Result.begin(), 634 Result.end()); 635 } else { 636 TemplateDecl *TD 637 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 638 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 639 640 if (SS.isSet() && !SS.isInvalid()) 641 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 642 /*TemplateKeyword=*/false, 643 TD); 644 else 645 Template = TemplateName(TD); 646 } 647 648 if (IsFunctionTemplate) { 649 // Function templates always go through overload resolution, at which 650 // point we'll perform the various checks (e.g., accessibility) we need 651 // to based on which function we selected. 652 Result.suppressDiagnostics(); 653 654 return NameClassification::FunctionTemplate(Template); 655 } 656 657 return NameClassification::TypeTemplate(Template); 658 } 659 } 660 661 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 662 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 663 DiagnoseUseOfDecl(Type, NameLoc); 664 QualType T = Context.getTypeDeclType(Type); 665 return ParsedType::make(T); 666 } 667 668 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 669 if (!Class) { 670 // FIXME: It's unfortunate that we don't have a Type node for handling this. 671 if (ObjCCompatibleAliasDecl *Alias 672 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 673 Class = Alias->getClassInterface(); 674 } 675 676 if (Class) { 677 DiagnoseUseOfDecl(Class, NameLoc); 678 679 if (NextToken.is(tok::period)) { 680 // Interface. <something> is parsed as a property reference expression. 681 // Just return "unknown" as a fall-through for now. 682 Result.suppressDiagnostics(); 683 return NameClassification::Unknown(); 684 } 685 686 QualType T = Context.getObjCInterfaceType(Class); 687 return ParsedType::make(T); 688 } 689 690 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 691 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 692 693 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 694 return BuildDeclarationNameExpr(SS, Result, ADL); 695} 696 697// Determines the context to return to after temporarily entering a 698// context. This depends in an unnecessarily complicated way on the 699// exact ordering of callbacks from the parser. 700DeclContext *Sema::getContainingDC(DeclContext *DC) { 701 702 // Functions defined inline within classes aren't parsed until we've 703 // finished parsing the top-level class, so the top-level class is 704 // the context we'll need to return to. 705 if (isa<FunctionDecl>(DC)) { 706 DC = DC->getLexicalParent(); 707 708 // A function not defined within a class will always return to its 709 // lexical context. 710 if (!isa<CXXRecordDecl>(DC)) 711 return DC; 712 713 // A C++ inline method/friend is parsed *after* the topmost class 714 // it was declared in is fully parsed ("complete"); the topmost 715 // class is the context we need to return to. 716 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 717 DC = RD; 718 719 // Return the declaration context of the topmost class the inline method is 720 // declared in. 721 return DC; 722 } 723 724 return DC->getLexicalParent(); 725} 726 727void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 728 assert(getContainingDC(DC) == CurContext && 729 "The next DeclContext should be lexically contained in the current one."); 730 CurContext = DC; 731 S->setEntity(DC); 732} 733 734void Sema::PopDeclContext() { 735 assert(CurContext && "DeclContext imbalance!"); 736 737 CurContext = getContainingDC(CurContext); 738 assert(CurContext && "Popped translation unit!"); 739} 740 741/// EnterDeclaratorContext - Used when we must lookup names in the context 742/// of a declarator's nested name specifier. 743/// 744void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 745 // C++0x [basic.lookup.unqual]p13: 746 // A name used in the definition of a static data member of class 747 // X (after the qualified-id of the static member) is looked up as 748 // if the name was used in a member function of X. 749 // C++0x [basic.lookup.unqual]p14: 750 // If a variable member of a namespace is defined outside of the 751 // scope of its namespace then any name used in the definition of 752 // the variable member (after the declarator-id) is looked up as 753 // if the definition of the variable member occurred in its 754 // namespace. 755 // Both of these imply that we should push a scope whose context 756 // is the semantic context of the declaration. We can't use 757 // PushDeclContext here because that context is not necessarily 758 // lexically contained in the current context. Fortunately, 759 // the containing scope should have the appropriate information. 760 761 assert(!S->getEntity() && "scope already has entity"); 762 763#ifndef NDEBUG 764 Scope *Ancestor = S->getParent(); 765 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 766 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 767#endif 768 769 CurContext = DC; 770 S->setEntity(DC); 771} 772 773void Sema::ExitDeclaratorContext(Scope *S) { 774 assert(S->getEntity() == CurContext && "Context imbalance!"); 775 776 // Switch back to the lexical context. The safety of this is 777 // enforced by an assert in EnterDeclaratorContext. 778 Scope *Ancestor = S->getParent(); 779 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 780 CurContext = (DeclContext*) Ancestor->getEntity(); 781 782 // We don't need to do anything with the scope, which is going to 783 // disappear. 784} 785 786 787void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 788 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 789 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 790 // We assume that the caller has already called 791 // ActOnReenterTemplateScope 792 FD = TFD->getTemplatedDecl(); 793 } 794 if (!FD) 795 return; 796 797 PushDeclContext(S, FD); 798 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 799 ParmVarDecl *Param = FD->getParamDecl(P); 800 // If the parameter has an identifier, then add it to the scope 801 if (Param->getIdentifier()) { 802 S->AddDecl(Param); 803 IdResolver.AddDecl(Param); 804 } 805 } 806} 807 808 809/// \brief Determine whether we allow overloading of the function 810/// PrevDecl with another declaration. 811/// 812/// This routine determines whether overloading is possible, not 813/// whether some new function is actually an overload. It will return 814/// true in C++ (where we can always provide overloads) or, as an 815/// extension, in C when the previous function is already an 816/// overloaded function declaration or has the "overloadable" 817/// attribute. 818static bool AllowOverloadingOfFunction(LookupResult &Previous, 819 ASTContext &Context) { 820 if (Context.getLangOptions().CPlusPlus) 821 return true; 822 823 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 824 return true; 825 826 return (Previous.getResultKind() == LookupResult::Found 827 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 828} 829 830/// Add this decl to the scope shadowed decl chains. 831void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 832 // Move up the scope chain until we find the nearest enclosing 833 // non-transparent context. The declaration will be introduced into this 834 // scope. 835 while (S->getEntity() && 836 ((DeclContext *)S->getEntity())->isTransparentContext()) 837 S = S->getParent(); 838 839 // Add scoped declarations into their context, so that they can be 840 // found later. Declarations without a context won't be inserted 841 // into any context. 842 if (AddToContext) 843 CurContext->addDecl(D); 844 845 // Out-of-line definitions shouldn't be pushed into scope in C++. 846 // Out-of-line variable and function definitions shouldn't even in C. 847 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 848 D->isOutOfLine() && 849 !D->getDeclContext()->getRedeclContext()->Equals( 850 D->getLexicalDeclContext()->getRedeclContext())) 851 return; 852 853 // Template instantiations should also not be pushed into scope. 854 if (isa<FunctionDecl>(D) && 855 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 856 return; 857 858 // If this replaces anything in the current scope, 859 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 860 IEnd = IdResolver.end(); 861 for (; I != IEnd; ++I) { 862 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 863 S->RemoveDecl(*I); 864 IdResolver.RemoveDecl(*I); 865 866 // Should only need to replace one decl. 867 break; 868 } 869 } 870 871 S->AddDecl(D); 872 873 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 874 // Implicitly-generated labels may end up getting generated in an order that 875 // isn't strictly lexical, which breaks name lookup. Be careful to insert 876 // the label at the appropriate place in the identifier chain. 877 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 878 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 879 if (IDC == CurContext) { 880 if (!S->isDeclScope(*I)) 881 continue; 882 } else if (IDC->Encloses(CurContext)) 883 break; 884 } 885 886 IdResolver.InsertDeclAfter(I, D); 887 } else { 888 IdResolver.AddDecl(D); 889 } 890} 891 892bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 893 bool ExplicitInstantiationOrSpecialization) { 894 return IdResolver.isDeclInScope(D, Ctx, Context, S, 895 ExplicitInstantiationOrSpecialization); 896} 897 898Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 899 DeclContext *TargetDC = DC->getPrimaryContext(); 900 do { 901 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 902 if (ScopeDC->getPrimaryContext() == TargetDC) 903 return S; 904 } while ((S = S->getParent())); 905 906 return 0; 907} 908 909static bool isOutOfScopePreviousDeclaration(NamedDecl *, 910 DeclContext*, 911 ASTContext&); 912 913/// Filters out lookup results that don't fall within the given scope 914/// as determined by isDeclInScope. 915void Sema::FilterLookupForScope(LookupResult &R, 916 DeclContext *Ctx, Scope *S, 917 bool ConsiderLinkage, 918 bool ExplicitInstantiationOrSpecialization) { 919 LookupResult::Filter F = R.makeFilter(); 920 while (F.hasNext()) { 921 NamedDecl *D = F.next(); 922 923 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 924 continue; 925 926 if (ConsiderLinkage && 927 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 928 continue; 929 930 F.erase(); 931 } 932 933 F.done(); 934} 935 936static bool isUsingDecl(NamedDecl *D) { 937 return isa<UsingShadowDecl>(D) || 938 isa<UnresolvedUsingTypenameDecl>(D) || 939 isa<UnresolvedUsingValueDecl>(D); 940} 941 942/// Removes using shadow declarations from the lookup results. 943static void RemoveUsingDecls(LookupResult &R) { 944 LookupResult::Filter F = R.makeFilter(); 945 while (F.hasNext()) 946 if (isUsingDecl(F.next())) 947 F.erase(); 948 949 F.done(); 950} 951 952/// \brief Check for this common pattern: 953/// @code 954/// class S { 955/// S(const S&); // DO NOT IMPLEMENT 956/// void operator=(const S&); // DO NOT IMPLEMENT 957/// }; 958/// @endcode 959static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 960 // FIXME: Should check for private access too but access is set after we get 961 // the decl here. 962 if (D->doesThisDeclarationHaveABody()) 963 return false; 964 965 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 966 return CD->isCopyConstructor(); 967 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 968 return Method->isCopyAssignmentOperator(); 969 return false; 970} 971 972bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 973 assert(D); 974 975 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 976 return false; 977 978 // Ignore class templates. 979 if (D->getDeclContext()->isDependentContext() || 980 D->getLexicalDeclContext()->isDependentContext()) 981 return false; 982 983 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 984 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 985 return false; 986 987 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 988 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 989 return false; 990 } else { 991 // 'static inline' functions are used in headers; don't warn. 992 if (FD->getStorageClass() == SC_Static && 993 FD->isInlineSpecified()) 994 return false; 995 } 996 997 if (FD->doesThisDeclarationHaveABody() && 998 Context.DeclMustBeEmitted(FD)) 999 return false; 1000 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1001 if (!VD->isFileVarDecl() || 1002 VD->getType().isConstant(Context) || 1003 Context.DeclMustBeEmitted(VD)) 1004 return false; 1005 1006 if (VD->isStaticDataMember() && 1007 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1008 return false; 1009 1010 } else { 1011 return false; 1012 } 1013 1014 // Only warn for unused decls internal to the translation unit. 1015 if (D->getLinkage() == ExternalLinkage) 1016 return false; 1017 1018 return true; 1019} 1020 1021void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1022 if (!D) 1023 return; 1024 1025 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1026 const FunctionDecl *First = FD->getFirstDeclaration(); 1027 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1028 return; // First should already be in the vector. 1029 } 1030 1031 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1032 const VarDecl *First = VD->getFirstDeclaration(); 1033 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1034 return; // First should already be in the vector. 1035 } 1036 1037 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1038 UnusedFileScopedDecls.push_back(D); 1039 } 1040 1041static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1042 if (D->isInvalidDecl()) 1043 return false; 1044 1045 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1046 return false; 1047 1048 if (isa<LabelDecl>(D)) 1049 return true; 1050 1051 // White-list anything that isn't a local variable. 1052 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1053 !D->getDeclContext()->isFunctionOrMethod()) 1054 return false; 1055 1056 // Types of valid local variables should be complete, so this should succeed. 1057 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1058 1059 // White-list anything with an __attribute__((unused)) type. 1060 QualType Ty = VD->getType(); 1061 1062 // Only look at the outermost level of typedef. 1063 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1064 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1065 return false; 1066 } 1067 1068 // If we failed to complete the type for some reason, or if the type is 1069 // dependent, don't diagnose the variable. 1070 if (Ty->isIncompleteType() || Ty->isDependentType()) 1071 return false; 1072 1073 if (const TagType *TT = Ty->getAs<TagType>()) { 1074 const TagDecl *Tag = TT->getDecl(); 1075 if (Tag->hasAttr<UnusedAttr>()) 1076 return false; 1077 1078 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1079 // FIXME: Checking for the presence of a user-declared constructor 1080 // isn't completely accurate; we'd prefer to check that the initializer 1081 // has no side effects. 1082 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1083 return false; 1084 } 1085 } 1086 1087 // TODO: __attribute__((unused)) templates? 1088 } 1089 1090 return true; 1091} 1092 1093static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1094 FixItHint &Hint) { 1095 if (isa<LabelDecl>(D)) { 1096 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1097 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1098 if (AfterColon.isInvalid()) 1099 return; 1100 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1101 getCharRange(D->getLocStart(), AfterColon)); 1102 } 1103 return; 1104} 1105 1106/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1107/// unless they are marked attr(unused). 1108void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1109 FixItHint Hint; 1110 if (!ShouldDiagnoseUnusedDecl(D)) 1111 return; 1112 1113 GenerateFixForUnusedDecl(D, Context, Hint); 1114 1115 unsigned DiagID; 1116 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1117 DiagID = diag::warn_unused_exception_param; 1118 else if (isa<LabelDecl>(D)) 1119 DiagID = diag::warn_unused_label; 1120 else 1121 DiagID = diag::warn_unused_variable; 1122 1123 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1124} 1125 1126static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1127 // Verify that we have no forward references left. If so, there was a goto 1128 // or address of a label taken, but no definition of it. Label fwd 1129 // definitions are indicated with a null substmt. 1130 if (L->getStmt() == 0) 1131 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1132} 1133 1134void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1135 if (S->decl_empty()) return; 1136 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1137 "Scope shouldn't contain decls!"); 1138 1139 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1140 I != E; ++I) { 1141 Decl *TmpD = (*I); 1142 assert(TmpD && "This decl didn't get pushed??"); 1143 1144 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1145 NamedDecl *D = cast<NamedDecl>(TmpD); 1146 1147 if (!D->getDeclName()) continue; 1148 1149 // Diagnose unused variables in this scope. 1150 if (!S->hasErrorOccurred()) 1151 DiagnoseUnusedDecl(D); 1152 1153 // If this was a forward reference to a label, verify it was defined. 1154 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1155 CheckPoppedLabel(LD, *this); 1156 1157 // Remove this name from our lexical scope. 1158 IdResolver.RemoveDecl(D); 1159 } 1160} 1161 1162/// \brief Look for an Objective-C class in the translation unit. 1163/// 1164/// \param Id The name of the Objective-C class we're looking for. If 1165/// typo-correction fixes this name, the Id will be updated 1166/// to the fixed name. 1167/// 1168/// \param IdLoc The location of the name in the translation unit. 1169/// 1170/// \param TypoCorrection If true, this routine will attempt typo correction 1171/// if there is no class with the given name. 1172/// 1173/// \returns The declaration of the named Objective-C class, or NULL if the 1174/// class could not be found. 1175ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1176 SourceLocation IdLoc, 1177 bool DoTypoCorrection) { 1178 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1179 // creation from this context. 1180 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1181 1182 if (!IDecl && DoTypoCorrection) { 1183 // Perform typo correction at the given location, but only if we 1184 // find an Objective-C class name. 1185 TypoCorrection C; 1186 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1187 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1188 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1189 Diag(IdLoc, diag::err_undef_interface_suggest) 1190 << Id << IDecl->getDeclName() 1191 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1192 Diag(IDecl->getLocation(), diag::note_previous_decl) 1193 << IDecl->getDeclName(); 1194 1195 Id = IDecl->getIdentifier(); 1196 } 1197 } 1198 1199 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1200} 1201 1202/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1203/// from S, where a non-field would be declared. This routine copes 1204/// with the difference between C and C++ scoping rules in structs and 1205/// unions. For example, the following code is well-formed in C but 1206/// ill-formed in C++: 1207/// @code 1208/// struct S6 { 1209/// enum { BAR } e; 1210/// }; 1211/// 1212/// void test_S6() { 1213/// struct S6 a; 1214/// a.e = BAR; 1215/// } 1216/// @endcode 1217/// For the declaration of BAR, this routine will return a different 1218/// scope. The scope S will be the scope of the unnamed enumeration 1219/// within S6. In C++, this routine will return the scope associated 1220/// with S6, because the enumeration's scope is a transparent 1221/// context but structures can contain non-field names. In C, this 1222/// routine will return the translation unit scope, since the 1223/// enumeration's scope is a transparent context and structures cannot 1224/// contain non-field names. 1225Scope *Sema::getNonFieldDeclScope(Scope *S) { 1226 while (((S->getFlags() & Scope::DeclScope) == 0) || 1227 (S->getEntity() && 1228 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1229 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1230 S = S->getParent(); 1231 return S; 1232} 1233 1234/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1235/// file scope. lazily create a decl for it. ForRedeclaration is true 1236/// if we're creating this built-in in anticipation of redeclaring the 1237/// built-in. 1238NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1239 Scope *S, bool ForRedeclaration, 1240 SourceLocation Loc) { 1241 Builtin::ID BID = (Builtin::ID)bid; 1242 1243 ASTContext::GetBuiltinTypeError Error; 1244 QualType R = Context.GetBuiltinType(BID, Error); 1245 switch (Error) { 1246 case ASTContext::GE_None: 1247 // Okay 1248 break; 1249 1250 case ASTContext::GE_Missing_stdio: 1251 if (ForRedeclaration) 1252 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1253 << Context.BuiltinInfo.GetName(BID); 1254 return 0; 1255 1256 case ASTContext::GE_Missing_setjmp: 1257 if (ForRedeclaration) 1258 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1259 << Context.BuiltinInfo.GetName(BID); 1260 return 0; 1261 } 1262 1263 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1264 Diag(Loc, diag::ext_implicit_lib_function_decl) 1265 << Context.BuiltinInfo.GetName(BID) 1266 << R; 1267 if (Context.BuiltinInfo.getHeaderName(BID) && 1268 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1269 != DiagnosticsEngine::Ignored) 1270 Diag(Loc, diag::note_please_include_header) 1271 << Context.BuiltinInfo.getHeaderName(BID) 1272 << Context.BuiltinInfo.GetName(BID); 1273 } 1274 1275 FunctionDecl *New = FunctionDecl::Create(Context, 1276 Context.getTranslationUnitDecl(), 1277 Loc, Loc, II, R, /*TInfo=*/0, 1278 SC_Extern, 1279 SC_None, false, 1280 /*hasPrototype=*/true); 1281 New->setImplicit(); 1282 1283 // Create Decl objects for each parameter, adding them to the 1284 // FunctionDecl. 1285 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1286 SmallVector<ParmVarDecl*, 16> Params; 1287 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1288 ParmVarDecl *parm = 1289 ParmVarDecl::Create(Context, New, SourceLocation(), 1290 SourceLocation(), 0, 1291 FT->getArgType(i), /*TInfo=*/0, 1292 SC_None, SC_None, 0); 1293 parm->setScopeInfo(0, i); 1294 Params.push_back(parm); 1295 } 1296 New->setParams(Params); 1297 } 1298 1299 AddKnownFunctionAttributes(New); 1300 1301 // TUScope is the translation-unit scope to insert this function into. 1302 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1303 // relate Scopes to DeclContexts, and probably eliminate CurContext 1304 // entirely, but we're not there yet. 1305 DeclContext *SavedContext = CurContext; 1306 CurContext = Context.getTranslationUnitDecl(); 1307 PushOnScopeChains(New, TUScope); 1308 CurContext = SavedContext; 1309 return New; 1310} 1311 1312/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1313/// same name and scope as a previous declaration 'Old'. Figure out 1314/// how to resolve this situation, merging decls or emitting 1315/// diagnostics as appropriate. If there was an error, set New to be invalid. 1316/// 1317void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1318 // If the new decl is known invalid already, don't bother doing any 1319 // merging checks. 1320 if (New->isInvalidDecl()) return; 1321 1322 // Allow multiple definitions for ObjC built-in typedefs. 1323 // FIXME: Verify the underlying types are equivalent! 1324 if (getLangOptions().ObjC1) { 1325 const IdentifierInfo *TypeID = New->getIdentifier(); 1326 switch (TypeID->getLength()) { 1327 default: break; 1328 case 2: 1329 if (!TypeID->isStr("id")) 1330 break; 1331 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1332 // Install the built-in type for 'id', ignoring the current definition. 1333 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1334 return; 1335 case 5: 1336 if (!TypeID->isStr("Class")) 1337 break; 1338 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1339 // Install the built-in type for 'Class', ignoring the current definition. 1340 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1341 return; 1342 case 3: 1343 if (!TypeID->isStr("SEL")) 1344 break; 1345 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1346 // Install the built-in type for 'SEL', ignoring the current definition. 1347 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1348 return; 1349 } 1350 // Fall through - the typedef name was not a builtin type. 1351 } 1352 1353 // Verify the old decl was also a type. 1354 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1355 if (!Old) { 1356 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1357 << New->getDeclName(); 1358 1359 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1360 if (OldD->getLocation().isValid()) 1361 Diag(OldD->getLocation(), diag::note_previous_definition); 1362 1363 return New->setInvalidDecl(); 1364 } 1365 1366 // If the old declaration is invalid, just give up here. 1367 if (Old->isInvalidDecl()) 1368 return New->setInvalidDecl(); 1369 1370 // Determine the "old" type we'll use for checking and diagnostics. 1371 QualType OldType; 1372 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1373 OldType = OldTypedef->getUnderlyingType(); 1374 else 1375 OldType = Context.getTypeDeclType(Old); 1376 1377 // If the typedef types are not identical, reject them in all languages and 1378 // with any extensions enabled. 1379 1380 if (OldType != New->getUnderlyingType() && 1381 Context.getCanonicalType(OldType) != 1382 Context.getCanonicalType(New->getUnderlyingType())) { 1383 int Kind = 0; 1384 if (isa<TypeAliasDecl>(Old)) 1385 Kind = 1; 1386 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1387 << Kind << New->getUnderlyingType() << OldType; 1388 if (Old->getLocation().isValid()) 1389 Diag(Old->getLocation(), diag::note_previous_definition); 1390 return New->setInvalidDecl(); 1391 } 1392 1393 // The types match. Link up the redeclaration chain if the old 1394 // declaration was a typedef. 1395 // FIXME: this is a potential source of weirdness if the type 1396 // spellings don't match exactly. 1397 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1398 New->setPreviousDeclaration(Typedef); 1399 1400 // __module_private__ is propagated to later declarations. 1401 if (Old->isModulePrivate()) 1402 New->setModulePrivate(); 1403 else if (New->isModulePrivate()) 1404 diagnoseModulePrivateRedeclaration(New, Old); 1405 1406 if (getLangOptions().MicrosoftExt) 1407 return; 1408 1409 if (getLangOptions().CPlusPlus) { 1410 // C++ [dcl.typedef]p2: 1411 // In a given non-class scope, a typedef specifier can be used to 1412 // redefine the name of any type declared in that scope to refer 1413 // to the type to which it already refers. 1414 if (!isa<CXXRecordDecl>(CurContext)) 1415 return; 1416 1417 // C++0x [dcl.typedef]p4: 1418 // In a given class scope, a typedef specifier can be used to redefine 1419 // any class-name declared in that scope that is not also a typedef-name 1420 // to refer to the type to which it already refers. 1421 // 1422 // This wording came in via DR424, which was a correction to the 1423 // wording in DR56, which accidentally banned code like: 1424 // 1425 // struct S { 1426 // typedef struct A { } A; 1427 // }; 1428 // 1429 // in the C++03 standard. We implement the C++0x semantics, which 1430 // allow the above but disallow 1431 // 1432 // struct S { 1433 // typedef int I; 1434 // typedef int I; 1435 // }; 1436 // 1437 // since that was the intent of DR56. 1438 if (!isa<TypedefNameDecl>(Old)) 1439 return; 1440 1441 Diag(New->getLocation(), diag::err_redefinition) 1442 << New->getDeclName(); 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 return New->setInvalidDecl(); 1445 } 1446 1447 // If we have a redefinition of a typedef in C, emit a warning. This warning 1448 // is normally mapped to an error, but can be controlled with 1449 // -Wtypedef-redefinition. If either the original or the redefinition is 1450 // in a system header, don't emit this for compatibility with GCC. 1451 if (getDiagnostics().getSuppressSystemWarnings() && 1452 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1453 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1454 return; 1455 1456 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1457 << New->getDeclName(); 1458 Diag(Old->getLocation(), diag::note_previous_definition); 1459 return; 1460} 1461 1462/// DeclhasAttr - returns true if decl Declaration already has the target 1463/// attribute. 1464static bool 1465DeclHasAttr(const Decl *D, const Attr *A) { 1466 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1467 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1468 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1469 if ((*i)->getKind() == A->getKind()) { 1470 if (Ann) { 1471 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1472 return true; 1473 continue; 1474 } 1475 // FIXME: Don't hardcode this check 1476 if (OA && isa<OwnershipAttr>(*i)) 1477 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1478 return true; 1479 } 1480 1481 return false; 1482} 1483 1484/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1485static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1486 ASTContext &C, bool mergeDeprecation = true) { 1487 if (!oldDecl->hasAttrs()) 1488 return; 1489 1490 bool foundAny = newDecl->hasAttrs(); 1491 1492 // Ensure that any moving of objects within the allocated map is done before 1493 // we process them. 1494 if (!foundAny) newDecl->setAttrs(AttrVec()); 1495 1496 for (specific_attr_iterator<InheritableAttr> 1497 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1498 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1499 // Ignore deprecated/unavailable/availability attributes if requested. 1500 if (!mergeDeprecation && 1501 (isa<DeprecatedAttr>(*i) || 1502 isa<UnavailableAttr>(*i) || 1503 isa<AvailabilityAttr>(*i))) 1504 continue; 1505 1506 if (!DeclHasAttr(newDecl, *i)) { 1507 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1508 newAttr->setInherited(true); 1509 newDecl->addAttr(newAttr); 1510 foundAny = true; 1511 } 1512 } 1513 1514 if (!foundAny) newDecl->dropAttrs(); 1515} 1516 1517/// mergeParamDeclAttributes - Copy attributes from the old parameter 1518/// to the new one. 1519static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1520 const ParmVarDecl *oldDecl, 1521 ASTContext &C) { 1522 if (!oldDecl->hasAttrs()) 1523 return; 1524 1525 bool foundAny = newDecl->hasAttrs(); 1526 1527 // Ensure that any moving of objects within the allocated map is 1528 // done before we process them. 1529 if (!foundAny) newDecl->setAttrs(AttrVec()); 1530 1531 for (specific_attr_iterator<InheritableParamAttr> 1532 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1533 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1534 if (!DeclHasAttr(newDecl, *i)) { 1535 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1536 newAttr->setInherited(true); 1537 newDecl->addAttr(newAttr); 1538 foundAny = true; 1539 } 1540 } 1541 1542 if (!foundAny) newDecl->dropAttrs(); 1543} 1544 1545namespace { 1546 1547/// Used in MergeFunctionDecl to keep track of function parameters in 1548/// C. 1549struct GNUCompatibleParamWarning { 1550 ParmVarDecl *OldParm; 1551 ParmVarDecl *NewParm; 1552 QualType PromotedType; 1553}; 1554 1555} 1556 1557/// getSpecialMember - get the special member enum for a method. 1558Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1559 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1560 if (Ctor->isDefaultConstructor()) 1561 return Sema::CXXDefaultConstructor; 1562 1563 if (Ctor->isCopyConstructor()) 1564 return Sema::CXXCopyConstructor; 1565 1566 if (Ctor->isMoveConstructor()) 1567 return Sema::CXXMoveConstructor; 1568 } else if (isa<CXXDestructorDecl>(MD)) { 1569 return Sema::CXXDestructor; 1570 } else if (MD->isCopyAssignmentOperator()) { 1571 return Sema::CXXCopyAssignment; 1572 } else if (MD->isMoveAssignmentOperator()) { 1573 return Sema::CXXMoveAssignment; 1574 } 1575 1576 return Sema::CXXInvalid; 1577} 1578 1579/// canRedefineFunction - checks if a function can be redefined. Currently, 1580/// only extern inline functions can be redefined, and even then only in 1581/// GNU89 mode. 1582static bool canRedefineFunction(const FunctionDecl *FD, 1583 const LangOptions& LangOpts) { 1584 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1585 !LangOpts.CPlusPlus && 1586 FD->isInlineSpecified() && 1587 FD->getStorageClass() == SC_Extern); 1588} 1589 1590/// MergeFunctionDecl - We just parsed a function 'New' from 1591/// declarator D which has the same name and scope as a previous 1592/// declaration 'Old'. Figure out how to resolve this situation, 1593/// merging decls or emitting diagnostics as appropriate. 1594/// 1595/// In C++, New and Old must be declarations that are not 1596/// overloaded. Use IsOverload to determine whether New and Old are 1597/// overloaded, and to select the Old declaration that New should be 1598/// merged with. 1599/// 1600/// Returns true if there was an error, false otherwise. 1601bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1602 // Verify the old decl was also a function. 1603 FunctionDecl *Old = 0; 1604 if (FunctionTemplateDecl *OldFunctionTemplate 1605 = dyn_cast<FunctionTemplateDecl>(OldD)) 1606 Old = OldFunctionTemplate->getTemplatedDecl(); 1607 else 1608 Old = dyn_cast<FunctionDecl>(OldD); 1609 if (!Old) { 1610 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1611 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1612 Diag(Shadow->getTargetDecl()->getLocation(), 1613 diag::note_using_decl_target); 1614 Diag(Shadow->getUsingDecl()->getLocation(), 1615 diag::note_using_decl) << 0; 1616 return true; 1617 } 1618 1619 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1620 << New->getDeclName(); 1621 Diag(OldD->getLocation(), diag::note_previous_definition); 1622 return true; 1623 } 1624 1625 // Determine whether the previous declaration was a definition, 1626 // implicit declaration, or a declaration. 1627 diag::kind PrevDiag; 1628 if (Old->isThisDeclarationADefinition()) 1629 PrevDiag = diag::note_previous_definition; 1630 else if (Old->isImplicit()) 1631 PrevDiag = diag::note_previous_implicit_declaration; 1632 else 1633 PrevDiag = diag::note_previous_declaration; 1634 1635 QualType OldQType = Context.getCanonicalType(Old->getType()); 1636 QualType NewQType = Context.getCanonicalType(New->getType()); 1637 1638 // Don't complain about this if we're in GNU89 mode and the old function 1639 // is an extern inline function. 1640 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1641 New->getStorageClass() == SC_Static && 1642 Old->getStorageClass() != SC_Static && 1643 !canRedefineFunction(Old, getLangOptions())) { 1644 if (getLangOptions().MicrosoftExt) { 1645 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1646 Diag(Old->getLocation(), PrevDiag); 1647 } else { 1648 Diag(New->getLocation(), diag::err_static_non_static) << New; 1649 Diag(Old->getLocation(), PrevDiag); 1650 return true; 1651 } 1652 } 1653 1654 // If a function is first declared with a calling convention, but is 1655 // later declared or defined without one, the second decl assumes the 1656 // calling convention of the first. 1657 // 1658 // For the new decl, we have to look at the NON-canonical type to tell the 1659 // difference between a function that really doesn't have a calling 1660 // convention and one that is declared cdecl. That's because in 1661 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1662 // because it is the default calling convention. 1663 // 1664 // Note also that we DO NOT return at this point, because we still have 1665 // other tests to run. 1666 const FunctionType *OldType = cast<FunctionType>(OldQType); 1667 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1668 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1669 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1670 bool RequiresAdjustment = false; 1671 if (OldTypeInfo.getCC() != CC_Default && 1672 NewTypeInfo.getCC() == CC_Default) { 1673 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1674 RequiresAdjustment = true; 1675 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1676 NewTypeInfo.getCC())) { 1677 // Calling conventions really aren't compatible, so complain. 1678 Diag(New->getLocation(), diag::err_cconv_change) 1679 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1680 << (OldTypeInfo.getCC() == CC_Default) 1681 << (OldTypeInfo.getCC() == CC_Default ? "" : 1682 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1683 Diag(Old->getLocation(), diag::note_previous_declaration); 1684 return true; 1685 } 1686 1687 // FIXME: diagnose the other way around? 1688 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1689 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1690 RequiresAdjustment = true; 1691 } 1692 1693 // Merge regparm attribute. 1694 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1695 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1696 if (NewTypeInfo.getHasRegParm()) { 1697 Diag(New->getLocation(), diag::err_regparm_mismatch) 1698 << NewType->getRegParmType() 1699 << OldType->getRegParmType(); 1700 Diag(Old->getLocation(), diag::note_previous_declaration); 1701 return true; 1702 } 1703 1704 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1705 RequiresAdjustment = true; 1706 } 1707 1708 if (RequiresAdjustment) { 1709 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1710 New->setType(QualType(NewType, 0)); 1711 NewQType = Context.getCanonicalType(New->getType()); 1712 } 1713 1714 if (getLangOptions().CPlusPlus) { 1715 // (C++98 13.1p2): 1716 // Certain function declarations cannot be overloaded: 1717 // -- Function declarations that differ only in the return type 1718 // cannot be overloaded. 1719 QualType OldReturnType = OldType->getResultType(); 1720 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1721 QualType ResQT; 1722 if (OldReturnType != NewReturnType) { 1723 if (NewReturnType->isObjCObjectPointerType() 1724 && OldReturnType->isObjCObjectPointerType()) 1725 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1726 if (ResQT.isNull()) { 1727 if (New->isCXXClassMember() && New->isOutOfLine()) 1728 Diag(New->getLocation(), 1729 diag::err_member_def_does_not_match_ret_type) << New; 1730 else 1731 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1732 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1733 return true; 1734 } 1735 else 1736 NewQType = ResQT; 1737 } 1738 1739 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1740 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1741 if (OldMethod && NewMethod) { 1742 // Preserve triviality. 1743 NewMethod->setTrivial(OldMethod->isTrivial()); 1744 1745 // MSVC allows explicit template specialization at class scope: 1746 // 2 CXMethodDecls referring to the same function will be injected. 1747 // We don't want a redeclartion error. 1748 bool IsClassScopeExplicitSpecialization = 1749 OldMethod->isFunctionTemplateSpecialization() && 1750 NewMethod->isFunctionTemplateSpecialization(); 1751 bool isFriend = NewMethod->getFriendObjectKind(); 1752 1753 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1754 !IsClassScopeExplicitSpecialization) { 1755 // -- Member function declarations with the same name and the 1756 // same parameter types cannot be overloaded if any of them 1757 // is a static member function declaration. 1758 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1759 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1760 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1761 return true; 1762 } 1763 1764 // C++ [class.mem]p1: 1765 // [...] A member shall not be declared twice in the 1766 // member-specification, except that a nested class or member 1767 // class template can be declared and then later defined. 1768 unsigned NewDiag; 1769 if (isa<CXXConstructorDecl>(OldMethod)) 1770 NewDiag = diag::err_constructor_redeclared; 1771 else if (isa<CXXDestructorDecl>(NewMethod)) 1772 NewDiag = diag::err_destructor_redeclared; 1773 else if (isa<CXXConversionDecl>(NewMethod)) 1774 NewDiag = diag::err_conv_function_redeclared; 1775 else 1776 NewDiag = diag::err_member_redeclared; 1777 1778 Diag(New->getLocation(), NewDiag); 1779 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1780 1781 // Complain if this is an explicit declaration of a special 1782 // member that was initially declared implicitly. 1783 // 1784 // As an exception, it's okay to befriend such methods in order 1785 // to permit the implicit constructor/destructor/operator calls. 1786 } else if (OldMethod->isImplicit()) { 1787 if (isFriend) { 1788 NewMethod->setImplicit(); 1789 } else { 1790 Diag(NewMethod->getLocation(), 1791 diag::err_definition_of_implicitly_declared_member) 1792 << New << getSpecialMember(OldMethod); 1793 return true; 1794 } 1795 } else if (OldMethod->isExplicitlyDefaulted()) { 1796 Diag(NewMethod->getLocation(), 1797 diag::err_definition_of_explicitly_defaulted_member) 1798 << getSpecialMember(OldMethod); 1799 return true; 1800 } 1801 } 1802 1803 // (C++98 8.3.5p3): 1804 // All declarations for a function shall agree exactly in both the 1805 // return type and the parameter-type-list. 1806 // We also want to respect all the extended bits except noreturn. 1807 1808 // noreturn should now match unless the old type info didn't have it. 1809 QualType OldQTypeForComparison = OldQType; 1810 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1811 assert(OldQType == QualType(OldType, 0)); 1812 const FunctionType *OldTypeForComparison 1813 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1814 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1815 assert(OldQTypeForComparison.isCanonical()); 1816 } 1817 1818 if (OldQTypeForComparison == NewQType) 1819 return MergeCompatibleFunctionDecls(New, Old); 1820 1821 // Fall through for conflicting redeclarations and redefinitions. 1822 } 1823 1824 // C: Function types need to be compatible, not identical. This handles 1825 // duplicate function decls like "void f(int); void f(enum X);" properly. 1826 if (!getLangOptions().CPlusPlus && 1827 Context.typesAreCompatible(OldQType, NewQType)) { 1828 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1829 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1830 const FunctionProtoType *OldProto = 0; 1831 if (isa<FunctionNoProtoType>(NewFuncType) && 1832 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1833 // The old declaration provided a function prototype, but the 1834 // new declaration does not. Merge in the prototype. 1835 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1836 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1837 OldProto->arg_type_end()); 1838 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1839 ParamTypes.data(), ParamTypes.size(), 1840 OldProto->getExtProtoInfo()); 1841 New->setType(NewQType); 1842 New->setHasInheritedPrototype(); 1843 1844 // Synthesize a parameter for each argument type. 1845 SmallVector<ParmVarDecl*, 16> Params; 1846 for (FunctionProtoType::arg_type_iterator 1847 ParamType = OldProto->arg_type_begin(), 1848 ParamEnd = OldProto->arg_type_end(); 1849 ParamType != ParamEnd; ++ParamType) { 1850 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1851 SourceLocation(), 1852 SourceLocation(), 0, 1853 *ParamType, /*TInfo=*/0, 1854 SC_None, SC_None, 1855 0); 1856 Param->setScopeInfo(0, Params.size()); 1857 Param->setImplicit(); 1858 Params.push_back(Param); 1859 } 1860 1861 New->setParams(Params); 1862 } 1863 1864 return MergeCompatibleFunctionDecls(New, Old); 1865 } 1866 1867 // GNU C permits a K&R definition to follow a prototype declaration 1868 // if the declared types of the parameters in the K&R definition 1869 // match the types in the prototype declaration, even when the 1870 // promoted types of the parameters from the K&R definition differ 1871 // from the types in the prototype. GCC then keeps the types from 1872 // the prototype. 1873 // 1874 // If a variadic prototype is followed by a non-variadic K&R definition, 1875 // the K&R definition becomes variadic. This is sort of an edge case, but 1876 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1877 // C99 6.9.1p8. 1878 if (!getLangOptions().CPlusPlus && 1879 Old->hasPrototype() && !New->hasPrototype() && 1880 New->getType()->getAs<FunctionProtoType>() && 1881 Old->getNumParams() == New->getNumParams()) { 1882 SmallVector<QualType, 16> ArgTypes; 1883 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1884 const FunctionProtoType *OldProto 1885 = Old->getType()->getAs<FunctionProtoType>(); 1886 const FunctionProtoType *NewProto 1887 = New->getType()->getAs<FunctionProtoType>(); 1888 1889 // Determine whether this is the GNU C extension. 1890 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1891 NewProto->getResultType()); 1892 bool LooseCompatible = !MergedReturn.isNull(); 1893 for (unsigned Idx = 0, End = Old->getNumParams(); 1894 LooseCompatible && Idx != End; ++Idx) { 1895 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1896 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1897 if (Context.typesAreCompatible(OldParm->getType(), 1898 NewProto->getArgType(Idx))) { 1899 ArgTypes.push_back(NewParm->getType()); 1900 } else if (Context.typesAreCompatible(OldParm->getType(), 1901 NewParm->getType(), 1902 /*CompareUnqualified=*/true)) { 1903 GNUCompatibleParamWarning Warn 1904 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1905 Warnings.push_back(Warn); 1906 ArgTypes.push_back(NewParm->getType()); 1907 } else 1908 LooseCompatible = false; 1909 } 1910 1911 if (LooseCompatible) { 1912 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1913 Diag(Warnings[Warn].NewParm->getLocation(), 1914 diag::ext_param_promoted_not_compatible_with_prototype) 1915 << Warnings[Warn].PromotedType 1916 << Warnings[Warn].OldParm->getType(); 1917 if (Warnings[Warn].OldParm->getLocation().isValid()) 1918 Diag(Warnings[Warn].OldParm->getLocation(), 1919 diag::note_previous_declaration); 1920 } 1921 1922 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1923 ArgTypes.size(), 1924 OldProto->getExtProtoInfo())); 1925 return MergeCompatibleFunctionDecls(New, Old); 1926 } 1927 1928 // Fall through to diagnose conflicting types. 1929 } 1930 1931 // A function that has already been declared has been redeclared or defined 1932 // with a different type- show appropriate diagnostic 1933 if (unsigned BuiltinID = Old->getBuiltinID()) { 1934 // The user has declared a builtin function with an incompatible 1935 // signature. 1936 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1937 // The function the user is redeclaring is a library-defined 1938 // function like 'malloc' or 'printf'. Warn about the 1939 // redeclaration, then pretend that we don't know about this 1940 // library built-in. 1941 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1942 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1943 << Old << Old->getType(); 1944 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1945 Old->setInvalidDecl(); 1946 return false; 1947 } 1948 1949 PrevDiag = diag::note_previous_builtin_declaration; 1950 } 1951 1952 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1953 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1954 return true; 1955} 1956 1957/// \brief Completes the merge of two function declarations that are 1958/// known to be compatible. 1959/// 1960/// This routine handles the merging of attributes and other 1961/// properties of function declarations form the old declaration to 1962/// the new declaration, once we know that New is in fact a 1963/// redeclaration of Old. 1964/// 1965/// \returns false 1966bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1967 // Merge the attributes 1968 mergeDeclAttributes(New, Old, Context); 1969 1970 // Merge the storage class. 1971 if (Old->getStorageClass() != SC_Extern && 1972 Old->getStorageClass() != SC_None) 1973 New->setStorageClass(Old->getStorageClass()); 1974 1975 // Merge "pure" flag. 1976 if (Old->isPure()) 1977 New->setPure(); 1978 1979 // __module_private__ is propagated to later declarations. 1980 if (Old->isModulePrivate()) 1981 New->setModulePrivate(); 1982 else if (New->isModulePrivate()) 1983 diagnoseModulePrivateRedeclaration(New, Old); 1984 1985 // Merge attributes from the parameters. These can mismatch with K&R 1986 // declarations. 1987 if (New->getNumParams() == Old->getNumParams()) 1988 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1989 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1990 Context); 1991 1992 if (getLangOptions().CPlusPlus) 1993 return MergeCXXFunctionDecl(New, Old); 1994 1995 return false; 1996} 1997 1998 1999void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2000 const ObjCMethodDecl *oldMethod) { 2001 // We don't want to merge unavailable and deprecated attributes 2002 // except from interface to implementation. 2003 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2004 2005 // Merge the attributes. 2006 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2007 2008 // Merge attributes from the parameters. 2009 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2010 for (ObjCMethodDecl::param_iterator 2011 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2012 ni != ne; ++ni, ++oi) 2013 mergeParamDeclAttributes(*ni, *oi, Context); 2014 2015 CheckObjCMethodOverride(newMethod, oldMethod, true); 2016} 2017 2018/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2019/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2020/// emitting diagnostics as appropriate. 2021/// 2022/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2023/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2024/// check them before the initializer is attached. 2025/// 2026void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2027 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2028 return; 2029 2030 QualType MergedT; 2031 if (getLangOptions().CPlusPlus) { 2032 AutoType *AT = New->getType()->getContainedAutoType(); 2033 if (AT && !AT->isDeduced()) { 2034 // We don't know what the new type is until the initializer is attached. 2035 return; 2036 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2037 // These could still be something that needs exception specs checked. 2038 return MergeVarDeclExceptionSpecs(New, Old); 2039 } 2040 // C++ [basic.link]p10: 2041 // [...] the types specified by all declarations referring to a given 2042 // object or function shall be identical, except that declarations for an 2043 // array object can specify array types that differ by the presence or 2044 // absence of a major array bound (8.3.4). 2045 else if (Old->getType()->isIncompleteArrayType() && 2046 New->getType()->isArrayType()) { 2047 CanQual<ArrayType> OldArray 2048 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2049 CanQual<ArrayType> NewArray 2050 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2051 if (OldArray->getElementType() == NewArray->getElementType()) 2052 MergedT = New->getType(); 2053 } else if (Old->getType()->isArrayType() && 2054 New->getType()->isIncompleteArrayType()) { 2055 CanQual<ArrayType> OldArray 2056 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2057 CanQual<ArrayType> NewArray 2058 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2059 if (OldArray->getElementType() == NewArray->getElementType()) 2060 MergedT = Old->getType(); 2061 } else if (New->getType()->isObjCObjectPointerType() 2062 && Old->getType()->isObjCObjectPointerType()) { 2063 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2064 Old->getType()); 2065 } 2066 } else { 2067 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2068 } 2069 if (MergedT.isNull()) { 2070 Diag(New->getLocation(), diag::err_redefinition_different_type) 2071 << New->getDeclName(); 2072 Diag(Old->getLocation(), diag::note_previous_definition); 2073 return New->setInvalidDecl(); 2074 } 2075 New->setType(MergedT); 2076} 2077 2078/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2079/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2080/// situation, merging decls or emitting diagnostics as appropriate. 2081/// 2082/// Tentative definition rules (C99 6.9.2p2) are checked by 2083/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2084/// definitions here, since the initializer hasn't been attached. 2085/// 2086void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2087 // If the new decl is already invalid, don't do any other checking. 2088 if (New->isInvalidDecl()) 2089 return; 2090 2091 // Verify the old decl was also a variable. 2092 VarDecl *Old = 0; 2093 if (!Previous.isSingleResult() || 2094 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2095 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2096 << New->getDeclName(); 2097 Diag(Previous.getRepresentativeDecl()->getLocation(), 2098 diag::note_previous_definition); 2099 return New->setInvalidDecl(); 2100 } 2101 2102 // C++ [class.mem]p1: 2103 // A member shall not be declared twice in the member-specification [...] 2104 // 2105 // Here, we need only consider static data members. 2106 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2107 Diag(New->getLocation(), diag::err_duplicate_member) 2108 << New->getIdentifier(); 2109 Diag(Old->getLocation(), diag::note_previous_declaration); 2110 New->setInvalidDecl(); 2111 } 2112 2113 mergeDeclAttributes(New, Old, Context); 2114 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2115 if (New->getAttr<WeakImportAttr>() && 2116 Old->getStorageClass() == SC_None && 2117 !Old->getAttr<WeakImportAttr>()) { 2118 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2119 Diag(Old->getLocation(), diag::note_previous_definition); 2120 // Remove weak_import attribute on new declaration. 2121 New->dropAttr<WeakImportAttr>(); 2122 } 2123 2124 // Merge the types. 2125 MergeVarDeclTypes(New, Old); 2126 if (New->isInvalidDecl()) 2127 return; 2128 2129 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2130 if (New->getStorageClass() == SC_Static && 2131 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2132 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2133 Diag(Old->getLocation(), diag::note_previous_definition); 2134 return New->setInvalidDecl(); 2135 } 2136 // C99 6.2.2p4: 2137 // For an identifier declared with the storage-class specifier 2138 // extern in a scope in which a prior declaration of that 2139 // identifier is visible,23) if the prior declaration specifies 2140 // internal or external linkage, the linkage of the identifier at 2141 // the later declaration is the same as the linkage specified at 2142 // the prior declaration. If no prior declaration is visible, or 2143 // if the prior declaration specifies no linkage, then the 2144 // identifier has external linkage. 2145 if (New->hasExternalStorage() && Old->hasLinkage()) 2146 /* Okay */; 2147 else if (New->getStorageClass() != SC_Static && 2148 Old->getStorageClass() == SC_Static) { 2149 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2150 Diag(Old->getLocation(), diag::note_previous_definition); 2151 return New->setInvalidDecl(); 2152 } 2153 2154 // Check if extern is followed by non-extern and vice-versa. 2155 if (New->hasExternalStorage() && 2156 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2157 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2158 Diag(Old->getLocation(), diag::note_previous_definition); 2159 return New->setInvalidDecl(); 2160 } 2161 if (Old->hasExternalStorage() && 2162 !New->hasLinkage() && New->isLocalVarDecl()) { 2163 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2164 Diag(Old->getLocation(), diag::note_previous_definition); 2165 return New->setInvalidDecl(); 2166 } 2167 2168 // __module_private__ is propagated to later declarations. 2169 if (Old->isModulePrivate()) 2170 New->setModulePrivate(); 2171 else if (New->isModulePrivate()) 2172 diagnoseModulePrivateRedeclaration(New, Old); 2173 2174 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2175 2176 // FIXME: The test for external storage here seems wrong? We still 2177 // need to check for mismatches. 2178 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2179 // Don't complain about out-of-line definitions of static members. 2180 !(Old->getLexicalDeclContext()->isRecord() && 2181 !New->getLexicalDeclContext()->isRecord())) { 2182 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2183 Diag(Old->getLocation(), diag::note_previous_definition); 2184 return New->setInvalidDecl(); 2185 } 2186 2187 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2188 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2189 Diag(Old->getLocation(), diag::note_previous_definition); 2190 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2191 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 } 2194 2195 // C++ doesn't have tentative definitions, so go right ahead and check here. 2196 const VarDecl *Def; 2197 if (getLangOptions().CPlusPlus && 2198 New->isThisDeclarationADefinition() == VarDecl::Definition && 2199 (Def = Old->getDefinition())) { 2200 Diag(New->getLocation(), diag::err_redefinition) 2201 << New->getDeclName(); 2202 Diag(Def->getLocation(), diag::note_previous_definition); 2203 New->setInvalidDecl(); 2204 return; 2205 } 2206 // c99 6.2.2 P4. 2207 // For an identifier declared with the storage-class specifier extern in a 2208 // scope in which a prior declaration of that identifier is visible, if 2209 // the prior declaration specifies internal or external linkage, the linkage 2210 // of the identifier at the later declaration is the same as the linkage 2211 // specified at the prior declaration. 2212 // FIXME. revisit this code. 2213 if (New->hasExternalStorage() && 2214 Old->getLinkage() == InternalLinkage && 2215 New->getDeclContext() == Old->getDeclContext()) 2216 New->setStorageClass(Old->getStorageClass()); 2217 2218 // Keep a chain of previous declarations. 2219 New->setPreviousDeclaration(Old); 2220 2221 // Inherit access appropriately. 2222 New->setAccess(Old->getAccess()); 2223} 2224 2225/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2226/// no declarator (e.g. "struct foo;") is parsed. 2227Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2228 DeclSpec &DS) { 2229 return ParsedFreeStandingDeclSpec(S, AS, DS, 2230 MultiTemplateParamsArg(*this, 0, 0)); 2231} 2232 2233/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2234/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2235/// parameters to cope with template friend declarations. 2236Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2237 DeclSpec &DS, 2238 MultiTemplateParamsArg TemplateParams) { 2239 Decl *TagD = 0; 2240 TagDecl *Tag = 0; 2241 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2242 DS.getTypeSpecType() == DeclSpec::TST_struct || 2243 DS.getTypeSpecType() == DeclSpec::TST_union || 2244 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2245 TagD = DS.getRepAsDecl(); 2246 2247 if (!TagD) // We probably had an error 2248 return 0; 2249 2250 // Note that the above type specs guarantee that the 2251 // type rep is a Decl, whereas in many of the others 2252 // it's a Type. 2253 Tag = dyn_cast<TagDecl>(TagD); 2254 } 2255 2256 if (Tag) 2257 Tag->setFreeStanding(); 2258 2259 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2260 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2261 // or incomplete types shall not be restrict-qualified." 2262 if (TypeQuals & DeclSpec::TQ_restrict) 2263 Diag(DS.getRestrictSpecLoc(), 2264 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2265 << DS.getSourceRange(); 2266 } 2267 2268 if (DS.isConstexprSpecified()) { 2269 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2270 // and definitions of functions and variables. 2271 if (Tag) 2272 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2273 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2274 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2275 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2276 else 2277 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2278 // Don't emit warnings after this error. 2279 return TagD; 2280 } 2281 2282 if (DS.isFriendSpecified()) { 2283 // If we're dealing with a decl but not a TagDecl, assume that 2284 // whatever routines created it handled the friendship aspect. 2285 if (TagD && !Tag) 2286 return 0; 2287 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2288 } 2289 2290 // Track whether we warned about the fact that there aren't any 2291 // declarators. 2292 bool emittedWarning = false; 2293 2294 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2295 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2296 2297 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2298 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2299 if (getLangOptions().CPlusPlus || 2300 Record->getDeclContext()->isRecord()) 2301 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2302 2303 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2304 << DS.getSourceRange(); 2305 emittedWarning = true; 2306 } 2307 } 2308 2309 // Check for Microsoft C extension: anonymous struct. 2310 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2311 CurContext->isRecord() && 2312 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2313 // Handle 2 kinds of anonymous struct: 2314 // struct STRUCT; 2315 // and 2316 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2317 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2318 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2319 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2320 DS.getRepAsType().get()->isStructureType())) { 2321 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2322 << DS.getSourceRange(); 2323 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2324 } 2325 } 2326 2327 if (getLangOptions().CPlusPlus && 2328 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2329 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2330 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2331 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2332 Diag(Enum->getLocation(), diag::ext_no_declarators) 2333 << DS.getSourceRange(); 2334 emittedWarning = true; 2335 } 2336 2337 // Skip all the checks below if we have a type error. 2338 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2339 2340 if (!DS.isMissingDeclaratorOk()) { 2341 // Warn about typedefs of enums without names, since this is an 2342 // extension in both Microsoft and GNU. 2343 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2344 Tag && isa<EnumDecl>(Tag)) { 2345 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2346 << DS.getSourceRange(); 2347 return Tag; 2348 } 2349 2350 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2351 << DS.getSourceRange(); 2352 emittedWarning = true; 2353 } 2354 2355 // We're going to complain about a bunch of spurious specifiers; 2356 // only do this if we're declaring a tag, because otherwise we 2357 // should be getting diag::ext_no_declarators. 2358 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2359 return TagD; 2360 2361 // Note that a linkage-specification sets a storage class, but 2362 // 'extern "C" struct foo;' is actually valid and not theoretically 2363 // useless. 2364 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2365 if (!DS.isExternInLinkageSpec()) 2366 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2367 << DeclSpec::getSpecifierName(scs); 2368 2369 if (DS.isThreadSpecified()) 2370 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2371 if (DS.getTypeQualifiers()) { 2372 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2373 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2374 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2375 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2376 // Restrict is covered above. 2377 } 2378 if (DS.isInlineSpecified()) 2379 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2380 if (DS.isVirtualSpecified()) 2381 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2382 if (DS.isExplicitSpecified()) 2383 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2384 2385 if (DS.isModulePrivateSpecified() && 2386 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2387 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2388 << Tag->getTagKind() 2389 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2390 2391 // FIXME: Warn on useless attributes 2392 2393 return TagD; 2394} 2395 2396/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2397/// builds a statement for it and returns it so it is evaluated. 2398StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2399 StmtResult R; 2400 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2401 Expr *Exp = DS.getRepAsExpr(); 2402 QualType Ty = Exp->getType(); 2403 if (Ty->isPointerType()) { 2404 do 2405 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2406 while (Ty->isPointerType()); 2407 } 2408 if (Ty->isVariableArrayType()) { 2409 R = ActOnExprStmt(MakeFullExpr(Exp)); 2410 } 2411 } 2412 return R; 2413} 2414 2415/// We are trying to inject an anonymous member into the given scope; 2416/// check if there's an existing declaration that can't be overloaded. 2417/// 2418/// \return true if this is a forbidden redeclaration 2419static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2420 Scope *S, 2421 DeclContext *Owner, 2422 DeclarationName Name, 2423 SourceLocation NameLoc, 2424 unsigned diagnostic) { 2425 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2426 Sema::ForRedeclaration); 2427 if (!SemaRef.LookupName(R, S)) return false; 2428 2429 if (R.getAsSingle<TagDecl>()) 2430 return false; 2431 2432 // Pick a representative declaration. 2433 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2434 assert(PrevDecl && "Expected a non-null Decl"); 2435 2436 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2437 return false; 2438 2439 SemaRef.Diag(NameLoc, diagnostic) << Name; 2440 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2441 2442 return true; 2443} 2444 2445/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2446/// anonymous struct or union AnonRecord into the owning context Owner 2447/// and scope S. This routine will be invoked just after we realize 2448/// that an unnamed union or struct is actually an anonymous union or 2449/// struct, e.g., 2450/// 2451/// @code 2452/// union { 2453/// int i; 2454/// float f; 2455/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2456/// // f into the surrounding scope.x 2457/// @endcode 2458/// 2459/// This routine is recursive, injecting the names of nested anonymous 2460/// structs/unions into the owning context and scope as well. 2461static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2462 DeclContext *Owner, 2463 RecordDecl *AnonRecord, 2464 AccessSpecifier AS, 2465 SmallVector<NamedDecl*, 2> &Chaining, 2466 bool MSAnonStruct) { 2467 unsigned diagKind 2468 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2469 : diag::err_anonymous_struct_member_redecl; 2470 2471 bool Invalid = false; 2472 2473 // Look every FieldDecl and IndirectFieldDecl with a name. 2474 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2475 DEnd = AnonRecord->decls_end(); 2476 D != DEnd; ++D) { 2477 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2478 cast<NamedDecl>(*D)->getDeclName()) { 2479 ValueDecl *VD = cast<ValueDecl>(*D); 2480 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2481 VD->getLocation(), diagKind)) { 2482 // C++ [class.union]p2: 2483 // The names of the members of an anonymous union shall be 2484 // distinct from the names of any other entity in the 2485 // scope in which the anonymous union is declared. 2486 Invalid = true; 2487 } else { 2488 // C++ [class.union]p2: 2489 // For the purpose of name lookup, after the anonymous union 2490 // definition, the members of the anonymous union are 2491 // considered to have been defined in the scope in which the 2492 // anonymous union is declared. 2493 unsigned OldChainingSize = Chaining.size(); 2494 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2495 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2496 PE = IF->chain_end(); PI != PE; ++PI) 2497 Chaining.push_back(*PI); 2498 else 2499 Chaining.push_back(VD); 2500 2501 assert(Chaining.size() >= 2); 2502 NamedDecl **NamedChain = 2503 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2504 for (unsigned i = 0; i < Chaining.size(); i++) 2505 NamedChain[i] = Chaining[i]; 2506 2507 IndirectFieldDecl* IndirectField = 2508 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2509 VD->getIdentifier(), VD->getType(), 2510 NamedChain, Chaining.size()); 2511 2512 IndirectField->setAccess(AS); 2513 IndirectField->setImplicit(); 2514 SemaRef.PushOnScopeChains(IndirectField, S); 2515 2516 // That includes picking up the appropriate access specifier. 2517 if (AS != AS_none) IndirectField->setAccess(AS); 2518 2519 Chaining.resize(OldChainingSize); 2520 } 2521 } 2522 } 2523 2524 return Invalid; 2525} 2526 2527/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2528/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2529/// illegal input values are mapped to SC_None. 2530static StorageClass 2531StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2532 switch (StorageClassSpec) { 2533 case DeclSpec::SCS_unspecified: return SC_None; 2534 case DeclSpec::SCS_extern: return SC_Extern; 2535 case DeclSpec::SCS_static: return SC_Static; 2536 case DeclSpec::SCS_auto: return SC_Auto; 2537 case DeclSpec::SCS_register: return SC_Register; 2538 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2539 // Illegal SCSs map to None: error reporting is up to the caller. 2540 case DeclSpec::SCS_mutable: // Fall through. 2541 case DeclSpec::SCS_typedef: return SC_None; 2542 } 2543 llvm_unreachable("unknown storage class specifier"); 2544} 2545 2546/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2547/// a StorageClass. Any error reporting is up to the caller: 2548/// illegal input values are mapped to SC_None. 2549static StorageClass 2550StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2551 switch (StorageClassSpec) { 2552 case DeclSpec::SCS_unspecified: return SC_None; 2553 case DeclSpec::SCS_extern: return SC_Extern; 2554 case DeclSpec::SCS_static: return SC_Static; 2555 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2556 // Illegal SCSs map to None: error reporting is up to the caller. 2557 case DeclSpec::SCS_auto: // Fall through. 2558 case DeclSpec::SCS_mutable: // Fall through. 2559 case DeclSpec::SCS_register: // Fall through. 2560 case DeclSpec::SCS_typedef: return SC_None; 2561 } 2562 llvm_unreachable("unknown storage class specifier"); 2563} 2564 2565/// BuildAnonymousStructOrUnion - Handle the declaration of an 2566/// anonymous structure or union. Anonymous unions are a C++ feature 2567/// (C++ [class.union]) and a GNU C extension; anonymous structures 2568/// are a GNU C and GNU C++ extension. 2569Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2570 AccessSpecifier AS, 2571 RecordDecl *Record) { 2572 DeclContext *Owner = Record->getDeclContext(); 2573 2574 // Diagnose whether this anonymous struct/union is an extension. 2575 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2576 Diag(Record->getLocation(), diag::ext_anonymous_union); 2577 else if (!Record->isUnion()) 2578 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2579 2580 // C and C++ require different kinds of checks for anonymous 2581 // structs/unions. 2582 bool Invalid = false; 2583 if (getLangOptions().CPlusPlus) { 2584 const char* PrevSpec = 0; 2585 unsigned DiagID; 2586 // C++ [class.union]p3: 2587 // Anonymous unions declared in a named namespace or in the 2588 // global namespace shall be declared static. 2589 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2590 (isa<TranslationUnitDecl>(Owner) || 2591 (isa<NamespaceDecl>(Owner) && 2592 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2593 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2594 Invalid = true; 2595 2596 // Recover by adding 'static'. 2597 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2598 PrevSpec, DiagID); 2599 } 2600 // C++ [class.union]p3: 2601 // A storage class is not allowed in a declaration of an 2602 // anonymous union in a class scope. 2603 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2604 isa<RecordDecl>(Owner)) { 2605 Diag(DS.getStorageClassSpecLoc(), 2606 diag::err_anonymous_union_with_storage_spec); 2607 Invalid = true; 2608 2609 // Recover by removing the storage specifier. 2610 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(), 2611 PrevSpec, DiagID); 2612 } 2613 2614 // Ignore const/volatile/restrict qualifiers. 2615 if (DS.getTypeQualifiers()) { 2616 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2617 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2618 << Record->isUnion() << 0 2619 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2620 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2621 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2622 << Record->isUnion() << 1 2623 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2624 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2625 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2626 << Record->isUnion() << 2 2627 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2628 2629 DS.ClearTypeQualifiers(); 2630 } 2631 2632 // C++ [class.union]p2: 2633 // The member-specification of an anonymous union shall only 2634 // define non-static data members. [Note: nested types and 2635 // functions cannot be declared within an anonymous union. ] 2636 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2637 MemEnd = Record->decls_end(); 2638 Mem != MemEnd; ++Mem) { 2639 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2640 // C++ [class.union]p3: 2641 // An anonymous union shall not have private or protected 2642 // members (clause 11). 2643 assert(FD->getAccess() != AS_none); 2644 if (FD->getAccess() != AS_public) { 2645 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2646 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2647 Invalid = true; 2648 } 2649 2650 // C++ [class.union]p1 2651 // An object of a class with a non-trivial constructor, a non-trivial 2652 // copy constructor, a non-trivial destructor, or a non-trivial copy 2653 // assignment operator cannot be a member of a union, nor can an 2654 // array of such objects. 2655 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2656 Invalid = true; 2657 } else if ((*Mem)->isImplicit()) { 2658 // Any implicit members are fine. 2659 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2660 // This is a type that showed up in an 2661 // elaborated-type-specifier inside the anonymous struct or 2662 // union, but which actually declares a type outside of the 2663 // anonymous struct or union. It's okay. 2664 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2665 if (!MemRecord->isAnonymousStructOrUnion() && 2666 MemRecord->getDeclName()) { 2667 // Visual C++ allows type definition in anonymous struct or union. 2668 if (getLangOptions().MicrosoftExt) 2669 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2670 << (int)Record->isUnion(); 2671 else { 2672 // This is a nested type declaration. 2673 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2674 << (int)Record->isUnion(); 2675 Invalid = true; 2676 } 2677 } 2678 } else if (isa<AccessSpecDecl>(*Mem)) { 2679 // Any access specifier is fine. 2680 } else { 2681 // We have something that isn't a non-static data 2682 // member. Complain about it. 2683 unsigned DK = diag::err_anonymous_record_bad_member; 2684 if (isa<TypeDecl>(*Mem)) 2685 DK = diag::err_anonymous_record_with_type; 2686 else if (isa<FunctionDecl>(*Mem)) 2687 DK = diag::err_anonymous_record_with_function; 2688 else if (isa<VarDecl>(*Mem)) 2689 DK = diag::err_anonymous_record_with_static; 2690 2691 // Visual C++ allows type definition in anonymous struct or union. 2692 if (getLangOptions().MicrosoftExt && 2693 DK == diag::err_anonymous_record_with_type) 2694 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2695 << (int)Record->isUnion(); 2696 else { 2697 Diag((*Mem)->getLocation(), DK) 2698 << (int)Record->isUnion(); 2699 Invalid = true; 2700 } 2701 } 2702 } 2703 } 2704 2705 if (!Record->isUnion() && !Owner->isRecord()) { 2706 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2707 << (int)getLangOptions().CPlusPlus; 2708 Invalid = true; 2709 } 2710 2711 // Mock up a declarator. 2712 Declarator Dc(DS, Declarator::MemberContext); 2713 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2714 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2715 2716 // Create a declaration for this anonymous struct/union. 2717 NamedDecl *Anon = 0; 2718 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2719 Anon = FieldDecl::Create(Context, OwningClass, 2720 DS.getSourceRange().getBegin(), 2721 Record->getLocation(), 2722 /*IdentifierInfo=*/0, 2723 Context.getTypeDeclType(Record), 2724 TInfo, 2725 /*BitWidth=*/0, /*Mutable=*/false, 2726 /*HasInit=*/false); 2727 Anon->setAccess(AS); 2728 if (getLangOptions().CPlusPlus) 2729 FieldCollector->Add(cast<FieldDecl>(Anon)); 2730 } else { 2731 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2732 assert(SCSpec != DeclSpec::SCS_typedef && 2733 "Parser allowed 'typedef' as storage class VarDecl."); 2734 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2735 if (SCSpec == DeclSpec::SCS_mutable) { 2736 // mutable can only appear on non-static class members, so it's always 2737 // an error here 2738 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2739 Invalid = true; 2740 SC = SC_None; 2741 } 2742 SCSpec = DS.getStorageClassSpecAsWritten(); 2743 VarDecl::StorageClass SCAsWritten 2744 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2745 2746 Anon = VarDecl::Create(Context, Owner, 2747 DS.getSourceRange().getBegin(), 2748 Record->getLocation(), /*IdentifierInfo=*/0, 2749 Context.getTypeDeclType(Record), 2750 TInfo, SC, SCAsWritten); 2751 2752 // Default-initialize the implicit variable. This initialization will be 2753 // trivial in almost all cases, except if a union member has an in-class 2754 // initializer: 2755 // union { int n = 0; }; 2756 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2757 } 2758 Anon->setImplicit(); 2759 2760 // Add the anonymous struct/union object to the current 2761 // context. We'll be referencing this object when we refer to one of 2762 // its members. 2763 Owner->addDecl(Anon); 2764 2765 // Inject the members of the anonymous struct/union into the owning 2766 // context and into the identifier resolver chain for name lookup 2767 // purposes. 2768 SmallVector<NamedDecl*, 2> Chain; 2769 Chain.push_back(Anon); 2770 2771 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2772 Chain, false)) 2773 Invalid = true; 2774 2775 // Mark this as an anonymous struct/union type. Note that we do not 2776 // do this until after we have already checked and injected the 2777 // members of this anonymous struct/union type, because otherwise 2778 // the members could be injected twice: once by DeclContext when it 2779 // builds its lookup table, and once by 2780 // InjectAnonymousStructOrUnionMembers. 2781 Record->setAnonymousStructOrUnion(true); 2782 2783 if (Invalid) 2784 Anon->setInvalidDecl(); 2785 2786 return Anon; 2787} 2788 2789/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2790/// Microsoft C anonymous structure. 2791/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2792/// Example: 2793/// 2794/// struct A { int a; }; 2795/// struct B { struct A; int b; }; 2796/// 2797/// void foo() { 2798/// B var; 2799/// var.a = 3; 2800/// } 2801/// 2802Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2803 RecordDecl *Record) { 2804 2805 // If there is no Record, get the record via the typedef. 2806 if (!Record) 2807 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2808 2809 // Mock up a declarator. 2810 Declarator Dc(DS, Declarator::TypeNameContext); 2811 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2812 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2813 2814 // Create a declaration for this anonymous struct. 2815 NamedDecl* Anon = FieldDecl::Create(Context, 2816 cast<RecordDecl>(CurContext), 2817 DS.getSourceRange().getBegin(), 2818 DS.getSourceRange().getBegin(), 2819 /*IdentifierInfo=*/0, 2820 Context.getTypeDeclType(Record), 2821 TInfo, 2822 /*BitWidth=*/0, /*Mutable=*/false, 2823 /*HasInit=*/false); 2824 Anon->setImplicit(); 2825 2826 // Add the anonymous struct object to the current context. 2827 CurContext->addDecl(Anon); 2828 2829 // Inject the members of the anonymous struct into the current 2830 // context and into the identifier resolver chain for name lookup 2831 // purposes. 2832 SmallVector<NamedDecl*, 2> Chain; 2833 Chain.push_back(Anon); 2834 2835 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2836 Record->getDefinition(), 2837 AS_none, Chain, true)) 2838 Anon->setInvalidDecl(); 2839 2840 return Anon; 2841} 2842 2843/// GetNameForDeclarator - Determine the full declaration name for the 2844/// given Declarator. 2845DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2846 return GetNameFromUnqualifiedId(D.getName()); 2847} 2848 2849/// \brief Retrieves the declaration name from a parsed unqualified-id. 2850DeclarationNameInfo 2851Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2852 DeclarationNameInfo NameInfo; 2853 NameInfo.setLoc(Name.StartLocation); 2854 2855 switch (Name.getKind()) { 2856 2857 case UnqualifiedId::IK_ImplicitSelfParam: 2858 case UnqualifiedId::IK_Identifier: 2859 NameInfo.setName(Name.Identifier); 2860 NameInfo.setLoc(Name.StartLocation); 2861 return NameInfo; 2862 2863 case UnqualifiedId::IK_OperatorFunctionId: 2864 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2865 Name.OperatorFunctionId.Operator)); 2866 NameInfo.setLoc(Name.StartLocation); 2867 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2868 = Name.OperatorFunctionId.SymbolLocations[0]; 2869 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2870 = Name.EndLocation.getRawEncoding(); 2871 return NameInfo; 2872 2873 case UnqualifiedId::IK_LiteralOperatorId: 2874 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2875 Name.Identifier)); 2876 NameInfo.setLoc(Name.StartLocation); 2877 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2878 return NameInfo; 2879 2880 case UnqualifiedId::IK_ConversionFunctionId: { 2881 TypeSourceInfo *TInfo; 2882 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2883 if (Ty.isNull()) 2884 return DeclarationNameInfo(); 2885 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2886 Context.getCanonicalType(Ty))); 2887 NameInfo.setLoc(Name.StartLocation); 2888 NameInfo.setNamedTypeInfo(TInfo); 2889 return NameInfo; 2890 } 2891 2892 case UnqualifiedId::IK_ConstructorName: { 2893 TypeSourceInfo *TInfo; 2894 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2895 if (Ty.isNull()) 2896 return DeclarationNameInfo(); 2897 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2898 Context.getCanonicalType(Ty))); 2899 NameInfo.setLoc(Name.StartLocation); 2900 NameInfo.setNamedTypeInfo(TInfo); 2901 return NameInfo; 2902 } 2903 2904 case UnqualifiedId::IK_ConstructorTemplateId: { 2905 // In well-formed code, we can only have a constructor 2906 // template-id that refers to the current context, so go there 2907 // to find the actual type being constructed. 2908 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2909 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2910 return DeclarationNameInfo(); 2911 2912 // Determine the type of the class being constructed. 2913 QualType CurClassType = Context.getTypeDeclType(CurClass); 2914 2915 // FIXME: Check two things: that the template-id names the same type as 2916 // CurClassType, and that the template-id does not occur when the name 2917 // was qualified. 2918 2919 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2920 Context.getCanonicalType(CurClassType))); 2921 NameInfo.setLoc(Name.StartLocation); 2922 // FIXME: should we retrieve TypeSourceInfo? 2923 NameInfo.setNamedTypeInfo(0); 2924 return NameInfo; 2925 } 2926 2927 case UnqualifiedId::IK_DestructorName: { 2928 TypeSourceInfo *TInfo; 2929 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2930 if (Ty.isNull()) 2931 return DeclarationNameInfo(); 2932 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2933 Context.getCanonicalType(Ty))); 2934 NameInfo.setLoc(Name.StartLocation); 2935 NameInfo.setNamedTypeInfo(TInfo); 2936 return NameInfo; 2937 } 2938 2939 case UnqualifiedId::IK_TemplateId: { 2940 TemplateName TName = Name.TemplateId->Template.get(); 2941 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2942 return Context.getNameForTemplate(TName, TNameLoc); 2943 } 2944 2945 } // switch (Name.getKind()) 2946 2947 llvm_unreachable("Unknown name kind"); 2948} 2949 2950static QualType getCoreType(QualType Ty) { 2951 do { 2952 if (Ty->isPointerType() || Ty->isReferenceType()) 2953 Ty = Ty->getPointeeType(); 2954 else if (Ty->isArrayType()) 2955 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2956 else 2957 return Ty.withoutLocalFastQualifiers(); 2958 } while (true); 2959} 2960 2961/// hasSimilarParameters - Determine whether the C++ functions Declaration 2962/// and Definition have "nearly" matching parameters. This heuristic is 2963/// used to improve diagnostics in the case where an out-of-line function 2964/// definition doesn't match any declaration within the class or namespace. 2965/// Also sets Params to the list of indices to the parameters that differ 2966/// between the declaration and the definition. If hasSimilarParameters 2967/// returns true and Params is empty, then all of the parameters match. 2968static bool hasSimilarParameters(ASTContext &Context, 2969 FunctionDecl *Declaration, 2970 FunctionDecl *Definition, 2971 llvm::SmallVectorImpl<unsigned> &Params) { 2972 Params.clear(); 2973 if (Declaration->param_size() != Definition->param_size()) 2974 return false; 2975 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2976 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2977 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2978 2979 // The parameter types are identical 2980 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2981 continue; 2982 2983 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2984 QualType DefParamBaseTy = getCoreType(DefParamTy); 2985 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2986 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2987 2988 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2989 (DeclTyName && DeclTyName == DefTyName)) 2990 Params.push_back(Idx); 2991 else // The two parameters aren't even close 2992 return false; 2993 } 2994 2995 return true; 2996} 2997 2998/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2999/// declarator needs to be rebuilt in the current instantiation. 3000/// Any bits of declarator which appear before the name are valid for 3001/// consideration here. That's specifically the type in the decl spec 3002/// and the base type in any member-pointer chunks. 3003static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3004 DeclarationName Name) { 3005 // The types we specifically need to rebuild are: 3006 // - typenames, typeofs, and decltypes 3007 // - types which will become injected class names 3008 // Of course, we also need to rebuild any type referencing such a 3009 // type. It's safest to just say "dependent", but we call out a 3010 // few cases here. 3011 3012 DeclSpec &DS = D.getMutableDeclSpec(); 3013 switch (DS.getTypeSpecType()) { 3014 case DeclSpec::TST_typename: 3015 case DeclSpec::TST_typeofType: 3016 case DeclSpec::TST_decltype: 3017 case DeclSpec::TST_underlyingType: 3018 case DeclSpec::TST_atomic: { 3019 // Grab the type from the parser. 3020 TypeSourceInfo *TSI = 0; 3021 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3022 if (T.isNull() || !T->isDependentType()) break; 3023 3024 // Make sure there's a type source info. This isn't really much 3025 // of a waste; most dependent types should have type source info 3026 // attached already. 3027 if (!TSI) 3028 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3029 3030 // Rebuild the type in the current instantiation. 3031 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3032 if (!TSI) return true; 3033 3034 // Store the new type back in the decl spec. 3035 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3036 DS.UpdateTypeRep(LocType); 3037 break; 3038 } 3039 3040 case DeclSpec::TST_typeofExpr: { 3041 Expr *E = DS.getRepAsExpr(); 3042 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3043 if (Result.isInvalid()) return true; 3044 DS.UpdateExprRep(Result.get()); 3045 break; 3046 } 3047 3048 default: 3049 // Nothing to do for these decl specs. 3050 break; 3051 } 3052 3053 // It doesn't matter what order we do this in. 3054 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3055 DeclaratorChunk &Chunk = D.getTypeObject(I); 3056 3057 // The only type information in the declarator which can come 3058 // before the declaration name is the base type of a member 3059 // pointer. 3060 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3061 continue; 3062 3063 // Rebuild the scope specifier in-place. 3064 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3065 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3066 return true; 3067 } 3068 3069 return false; 3070} 3071 3072Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3073 D.setFunctionDefinition(false); 3074 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3075} 3076 3077/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3078/// If T is the name of a class, then each of the following shall have a 3079/// name different from T: 3080/// - every static data member of class T; 3081/// - every member function of class T 3082/// - every member of class T that is itself a type; 3083/// \returns true if the declaration name violates these rules. 3084bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3085 DeclarationNameInfo NameInfo) { 3086 DeclarationName Name = NameInfo.getName(); 3087 3088 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3089 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3090 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3091 return true; 3092 } 3093 3094 return false; 3095} 3096 3097Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3098 MultiTemplateParamsArg TemplateParamLists) { 3099 // TODO: consider using NameInfo for diagnostic. 3100 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3101 DeclarationName Name = NameInfo.getName(); 3102 3103 // All of these full declarators require an identifier. If it doesn't have 3104 // one, the ParsedFreeStandingDeclSpec action should be used. 3105 if (!Name) { 3106 if (!D.isInvalidType()) // Reject this if we think it is valid. 3107 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3108 diag::err_declarator_need_ident) 3109 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3110 return 0; 3111 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3112 return 0; 3113 3114 // The scope passed in may not be a decl scope. Zip up the scope tree until 3115 // we find one that is. 3116 while ((S->getFlags() & Scope::DeclScope) == 0 || 3117 (S->getFlags() & Scope::TemplateParamScope) != 0) 3118 S = S->getParent(); 3119 3120 DeclContext *DC = CurContext; 3121 if (D.getCXXScopeSpec().isInvalid()) 3122 D.setInvalidType(); 3123 else if (D.getCXXScopeSpec().isSet()) { 3124 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3125 UPPC_DeclarationQualifier)) 3126 return 0; 3127 3128 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3129 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3130 if (!DC) { 3131 // If we could not compute the declaration context, it's because the 3132 // declaration context is dependent but does not refer to a class, 3133 // class template, or class template partial specialization. Complain 3134 // and return early, to avoid the coming semantic disaster. 3135 Diag(D.getIdentifierLoc(), 3136 diag::err_template_qualified_declarator_no_match) 3137 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3138 << D.getCXXScopeSpec().getRange(); 3139 return 0; 3140 } 3141 bool IsDependentContext = DC->isDependentContext(); 3142 3143 if (!IsDependentContext && 3144 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3145 return 0; 3146 3147 if (isa<CXXRecordDecl>(DC)) { 3148 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3149 Diag(D.getIdentifierLoc(), 3150 diag::err_member_def_undefined_record) 3151 << Name << DC << D.getCXXScopeSpec().getRange(); 3152 D.setInvalidType(); 3153 } else if (isa<CXXRecordDecl>(CurContext) && 3154 !D.getDeclSpec().isFriendSpecified()) { 3155 // The user provided a superfluous scope specifier inside a class 3156 // definition: 3157 // 3158 // class X { 3159 // void X::f(); 3160 // }; 3161 if (CurContext->Equals(DC)) 3162 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3163 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3164 else 3165 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3166 << Name << D.getCXXScopeSpec().getRange(); 3167 3168 // Pretend that this qualifier was not here. 3169 D.getCXXScopeSpec().clear(); 3170 } 3171 } 3172 3173 // Check whether we need to rebuild the type of the given 3174 // declaration in the current instantiation. 3175 if (EnteringContext && IsDependentContext && 3176 TemplateParamLists.size() != 0) { 3177 ContextRAII SavedContext(*this, DC); 3178 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3179 D.setInvalidType(); 3180 } 3181 } 3182 3183 if (DiagnoseClassNameShadow(DC, NameInfo)) 3184 // If this is a typedef, we'll end up spewing multiple diagnostics. 3185 // Just return early; it's safer. 3186 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3187 return 0; 3188 3189 NamedDecl *New; 3190 3191 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3192 QualType R = TInfo->getType(); 3193 3194 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3195 UPPC_DeclarationType)) 3196 D.setInvalidType(); 3197 3198 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3199 ForRedeclaration); 3200 3201 // See if this is a redefinition of a variable in the same scope. 3202 if (!D.getCXXScopeSpec().isSet()) { 3203 bool IsLinkageLookup = false; 3204 3205 // If the declaration we're planning to build will be a function 3206 // or object with linkage, then look for another declaration with 3207 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3208 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3209 /* Do nothing*/; 3210 else if (R->isFunctionType()) { 3211 if (CurContext->isFunctionOrMethod() || 3212 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3213 IsLinkageLookup = true; 3214 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3215 IsLinkageLookup = true; 3216 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3217 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3218 IsLinkageLookup = true; 3219 3220 if (IsLinkageLookup) 3221 Previous.clear(LookupRedeclarationWithLinkage); 3222 3223 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3224 } else { // Something like "int foo::x;" 3225 LookupQualifiedName(Previous, DC); 3226 3227 // Don't consider using declarations as previous declarations for 3228 // out-of-line members. 3229 RemoveUsingDecls(Previous); 3230 3231 // C++ 7.3.1.2p2: 3232 // Members (including explicit specializations of templates) of a named 3233 // namespace can also be defined outside that namespace by explicit 3234 // qualification of the name being defined, provided that the entity being 3235 // defined was already declared in the namespace and the definition appears 3236 // after the point of declaration in a namespace that encloses the 3237 // declarations namespace. 3238 // 3239 // Note that we only check the context at this point. We don't yet 3240 // have enough information to make sure that PrevDecl is actually 3241 // the declaration we want to match. For example, given: 3242 // 3243 // class X { 3244 // void f(); 3245 // void f(float); 3246 // }; 3247 // 3248 // void X::f(int) { } // ill-formed 3249 // 3250 // In this case, PrevDecl will point to the overload set 3251 // containing the two f's declared in X, but neither of them 3252 // matches. 3253 3254 // First check whether we named the global scope. 3255 if (isa<TranslationUnitDecl>(DC)) { 3256 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3257 << Name << D.getCXXScopeSpec().getRange(); 3258 } else { 3259 DeclContext *Cur = CurContext; 3260 while (isa<LinkageSpecDecl>(Cur)) 3261 Cur = Cur->getParent(); 3262 if (!Cur->Encloses(DC)) { 3263 // The qualifying scope doesn't enclose the original declaration. 3264 // Emit diagnostic based on current scope. 3265 SourceLocation L = D.getIdentifierLoc(); 3266 SourceRange R = D.getCXXScopeSpec().getRange(); 3267 if (isa<FunctionDecl>(Cur)) 3268 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3269 else 3270 Diag(L, diag::err_invalid_declarator_scope) 3271 << Name << cast<NamedDecl>(DC) << R; 3272 D.setInvalidType(); 3273 } 3274 } 3275 } 3276 3277 if (Previous.isSingleResult() && 3278 Previous.getFoundDecl()->isTemplateParameter()) { 3279 // Maybe we will complain about the shadowed template parameter. 3280 if (!D.isInvalidType()) 3281 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3282 Previous.getFoundDecl())) 3283 D.setInvalidType(); 3284 3285 // Just pretend that we didn't see the previous declaration. 3286 Previous.clear(); 3287 } 3288 3289 // In C++, the previous declaration we find might be a tag type 3290 // (class or enum). In this case, the new declaration will hide the 3291 // tag type. Note that this does does not apply if we're declaring a 3292 // typedef (C++ [dcl.typedef]p4). 3293 if (Previous.isSingleTagDecl() && 3294 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3295 Previous.clear(); 3296 3297 bool AddToScope = true; 3298 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3299 if (TemplateParamLists.size()) { 3300 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3301 return 0; 3302 } 3303 3304 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3305 } else if (R->isFunctionType()) { 3306 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3307 move(TemplateParamLists), 3308 AddToScope); 3309 } else { 3310 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3311 move(TemplateParamLists)); 3312 } 3313 3314 if (New == 0) 3315 return 0; 3316 3317 // If this has an identifier and is not an invalid redeclaration or 3318 // function template specialization, add it to the scope stack. 3319 if (New->getDeclName() && AddToScope && 3320 !(D.isRedeclaration() && New->isInvalidDecl())) 3321 PushOnScopeChains(New, S); 3322 3323 return New; 3324} 3325 3326/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3327/// types into constant array types in certain situations which would otherwise 3328/// be errors (for GCC compatibility). 3329static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3330 ASTContext &Context, 3331 bool &SizeIsNegative, 3332 llvm::APSInt &Oversized) { 3333 // This method tries to turn a variable array into a constant 3334 // array even when the size isn't an ICE. This is necessary 3335 // for compatibility with code that depends on gcc's buggy 3336 // constant expression folding, like struct {char x[(int)(char*)2];} 3337 SizeIsNegative = false; 3338 Oversized = 0; 3339 3340 if (T->isDependentType()) 3341 return QualType(); 3342 3343 QualifierCollector Qs; 3344 const Type *Ty = Qs.strip(T); 3345 3346 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3347 QualType Pointee = PTy->getPointeeType(); 3348 QualType FixedType = 3349 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3350 Oversized); 3351 if (FixedType.isNull()) return FixedType; 3352 FixedType = Context.getPointerType(FixedType); 3353 return Qs.apply(Context, FixedType); 3354 } 3355 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3356 QualType Inner = PTy->getInnerType(); 3357 QualType FixedType = 3358 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3359 Oversized); 3360 if (FixedType.isNull()) return FixedType; 3361 FixedType = Context.getParenType(FixedType); 3362 return Qs.apply(Context, FixedType); 3363 } 3364 3365 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3366 if (!VLATy) 3367 return QualType(); 3368 // FIXME: We should probably handle this case 3369 if (VLATy->getElementType()->isVariablyModifiedType()) 3370 return QualType(); 3371 3372 Expr::EvalResult EvalResult; 3373 if (!VLATy->getSizeExpr() || 3374 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3375 !EvalResult.Val.isInt()) 3376 return QualType(); 3377 3378 // Check whether the array size is negative. 3379 llvm::APSInt &Res = EvalResult.Val.getInt(); 3380 if (Res.isSigned() && Res.isNegative()) { 3381 SizeIsNegative = true; 3382 return QualType(); 3383 } 3384 3385 // Check whether the array is too large to be addressed. 3386 unsigned ActiveSizeBits 3387 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3388 Res); 3389 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3390 Oversized = Res; 3391 return QualType(); 3392 } 3393 3394 return Context.getConstantArrayType(VLATy->getElementType(), 3395 Res, ArrayType::Normal, 0); 3396} 3397 3398/// \brief Register the given locally-scoped external C declaration so 3399/// that it can be found later for redeclarations 3400void 3401Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3402 const LookupResult &Previous, 3403 Scope *S) { 3404 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3405 "Decl is not a locally-scoped decl!"); 3406 // Note that we have a locally-scoped external with this name. 3407 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3408 3409 if (!Previous.isSingleResult()) 3410 return; 3411 3412 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3413 3414 // If there was a previous declaration of this variable, it may be 3415 // in our identifier chain. Update the identifier chain with the new 3416 // declaration. 3417 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3418 // The previous declaration was found on the identifer resolver 3419 // chain, so remove it from its scope. 3420 3421 if (S->isDeclScope(PrevDecl)) { 3422 // Special case for redeclarations in the SAME scope. 3423 // Because this declaration is going to be added to the identifier chain 3424 // later, we should temporarily take it OFF the chain. 3425 IdResolver.RemoveDecl(ND); 3426 3427 } else { 3428 // Find the scope for the original declaration. 3429 while (S && !S->isDeclScope(PrevDecl)) 3430 S = S->getParent(); 3431 } 3432 3433 if (S) 3434 S->RemoveDecl(PrevDecl); 3435 } 3436} 3437 3438llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3439Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3440 if (ExternalSource) { 3441 // Load locally-scoped external decls from the external source. 3442 SmallVector<NamedDecl *, 4> Decls; 3443 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3444 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3445 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3446 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3447 if (Pos == LocallyScopedExternalDecls.end()) 3448 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3449 } 3450 } 3451 3452 return LocallyScopedExternalDecls.find(Name); 3453} 3454 3455/// \brief Diagnose function specifiers on a declaration of an identifier that 3456/// does not identify a function. 3457void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3458 // FIXME: We should probably indicate the identifier in question to avoid 3459 // confusion for constructs like "inline int a(), b;" 3460 if (D.getDeclSpec().isInlineSpecified()) 3461 Diag(D.getDeclSpec().getInlineSpecLoc(), 3462 diag::err_inline_non_function); 3463 3464 if (D.getDeclSpec().isVirtualSpecified()) 3465 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3466 diag::err_virtual_non_function); 3467 3468 if (D.getDeclSpec().isExplicitSpecified()) 3469 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3470 diag::err_explicit_non_function); 3471} 3472 3473NamedDecl* 3474Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3475 TypeSourceInfo *TInfo, LookupResult &Previous) { 3476 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3477 if (D.getCXXScopeSpec().isSet()) { 3478 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3479 << D.getCXXScopeSpec().getRange(); 3480 D.setInvalidType(); 3481 // Pretend we didn't see the scope specifier. 3482 DC = CurContext; 3483 Previous.clear(); 3484 } 3485 3486 if (getLangOptions().CPlusPlus) { 3487 // Check that there are no default arguments (C++ only). 3488 CheckExtraCXXDefaultArguments(D); 3489 } 3490 3491 DiagnoseFunctionSpecifiers(D); 3492 3493 if (D.getDeclSpec().isThreadSpecified()) 3494 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3495 if (D.getDeclSpec().isConstexprSpecified()) 3496 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3497 << 1; 3498 3499 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3500 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3501 << D.getName().getSourceRange(); 3502 return 0; 3503 } 3504 3505 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3506 if (!NewTD) return 0; 3507 3508 // Handle attributes prior to checking for duplicates in MergeVarDecl 3509 ProcessDeclAttributes(S, NewTD, D); 3510 3511 CheckTypedefForVariablyModifiedType(S, NewTD); 3512 3513 bool Redeclaration = D.isRedeclaration(); 3514 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3515 D.setRedeclaration(Redeclaration); 3516 return ND; 3517} 3518 3519void 3520Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3521 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3522 // then it shall have block scope. 3523 // Note that variably modified types must be fixed before merging the decl so 3524 // that redeclarations will match. 3525 QualType T = NewTD->getUnderlyingType(); 3526 if (T->isVariablyModifiedType()) { 3527 getCurFunction()->setHasBranchProtectedScope(); 3528 3529 if (S->getFnParent() == 0) { 3530 bool SizeIsNegative; 3531 llvm::APSInt Oversized; 3532 QualType FixedTy = 3533 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3534 Oversized); 3535 if (!FixedTy.isNull()) { 3536 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3537 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3538 } else { 3539 if (SizeIsNegative) 3540 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3541 else if (T->isVariableArrayType()) 3542 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3543 else if (Oversized.getBoolValue()) 3544 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3545 else 3546 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3547 NewTD->setInvalidDecl(); 3548 } 3549 } 3550 } 3551} 3552 3553 3554/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3555/// declares a typedef-name, either using the 'typedef' type specifier or via 3556/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3557NamedDecl* 3558Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3559 LookupResult &Previous, bool &Redeclaration) { 3560 // Merge the decl with the existing one if appropriate. If the decl is 3561 // in an outer scope, it isn't the same thing. 3562 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3563 /*ExplicitInstantiationOrSpecialization=*/false); 3564 if (!Previous.empty()) { 3565 Redeclaration = true; 3566 MergeTypedefNameDecl(NewTD, Previous); 3567 } 3568 3569 // If this is the C FILE type, notify the AST context. 3570 if (IdentifierInfo *II = NewTD->getIdentifier()) 3571 if (!NewTD->isInvalidDecl() && 3572 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3573 if (II->isStr("FILE")) 3574 Context.setFILEDecl(NewTD); 3575 else if (II->isStr("jmp_buf")) 3576 Context.setjmp_bufDecl(NewTD); 3577 else if (II->isStr("sigjmp_buf")) 3578 Context.setsigjmp_bufDecl(NewTD); 3579 else if (II->isStr("__builtin_va_list")) 3580 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3581 } 3582 3583 return NewTD; 3584} 3585 3586/// \brief Determines whether the given declaration is an out-of-scope 3587/// previous declaration. 3588/// 3589/// This routine should be invoked when name lookup has found a 3590/// previous declaration (PrevDecl) that is not in the scope where a 3591/// new declaration by the same name is being introduced. If the new 3592/// declaration occurs in a local scope, previous declarations with 3593/// linkage may still be considered previous declarations (C99 3594/// 6.2.2p4-5, C++ [basic.link]p6). 3595/// 3596/// \param PrevDecl the previous declaration found by name 3597/// lookup 3598/// 3599/// \param DC the context in which the new declaration is being 3600/// declared. 3601/// 3602/// \returns true if PrevDecl is an out-of-scope previous declaration 3603/// for a new delcaration with the same name. 3604static bool 3605isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3606 ASTContext &Context) { 3607 if (!PrevDecl) 3608 return false; 3609 3610 if (!PrevDecl->hasLinkage()) 3611 return false; 3612 3613 if (Context.getLangOptions().CPlusPlus) { 3614 // C++ [basic.link]p6: 3615 // If there is a visible declaration of an entity with linkage 3616 // having the same name and type, ignoring entities declared 3617 // outside the innermost enclosing namespace scope, the block 3618 // scope declaration declares that same entity and receives the 3619 // linkage of the previous declaration. 3620 DeclContext *OuterContext = DC->getRedeclContext(); 3621 if (!OuterContext->isFunctionOrMethod()) 3622 // This rule only applies to block-scope declarations. 3623 return false; 3624 3625 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3626 if (PrevOuterContext->isRecord()) 3627 // We found a member function: ignore it. 3628 return false; 3629 3630 // Find the innermost enclosing namespace for the new and 3631 // previous declarations. 3632 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3633 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3634 3635 // The previous declaration is in a different namespace, so it 3636 // isn't the same function. 3637 if (!OuterContext->Equals(PrevOuterContext)) 3638 return false; 3639 } 3640 3641 return true; 3642} 3643 3644static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3645 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3646 if (!SS.isSet()) return; 3647 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3648} 3649 3650bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3651 QualType type = decl->getType(); 3652 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3653 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3654 // Various kinds of declaration aren't allowed to be __autoreleasing. 3655 unsigned kind = -1U; 3656 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3657 if (var->hasAttr<BlocksAttr>()) 3658 kind = 0; // __block 3659 else if (!var->hasLocalStorage()) 3660 kind = 1; // global 3661 } else if (isa<ObjCIvarDecl>(decl)) { 3662 kind = 3; // ivar 3663 } else if (isa<FieldDecl>(decl)) { 3664 kind = 2; // field 3665 } 3666 3667 if (kind != -1U) { 3668 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3669 << kind; 3670 } 3671 } else if (lifetime == Qualifiers::OCL_None) { 3672 // Try to infer lifetime. 3673 if (!type->isObjCLifetimeType()) 3674 return false; 3675 3676 lifetime = type->getObjCARCImplicitLifetime(); 3677 type = Context.getLifetimeQualifiedType(type, lifetime); 3678 decl->setType(type); 3679 } 3680 3681 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3682 // Thread-local variables cannot have lifetime. 3683 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3684 var->isThreadSpecified()) { 3685 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3686 << var->getType(); 3687 return true; 3688 } 3689 } 3690 3691 return false; 3692} 3693 3694NamedDecl* 3695Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3696 TypeSourceInfo *TInfo, LookupResult &Previous, 3697 MultiTemplateParamsArg TemplateParamLists) { 3698 QualType R = TInfo->getType(); 3699 DeclarationName Name = GetNameForDeclarator(D).getName(); 3700 3701 // Check that there are no default arguments (C++ only). 3702 if (getLangOptions().CPlusPlus) 3703 CheckExtraCXXDefaultArguments(D); 3704 3705 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3706 assert(SCSpec != DeclSpec::SCS_typedef && 3707 "Parser allowed 'typedef' as storage class VarDecl."); 3708 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3709 if (SCSpec == DeclSpec::SCS_mutable) { 3710 // mutable can only appear on non-static class members, so it's always 3711 // an error here 3712 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3713 D.setInvalidType(); 3714 SC = SC_None; 3715 } 3716 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3717 VarDecl::StorageClass SCAsWritten 3718 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3719 3720 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3721 if (!II) { 3722 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3723 << Name; 3724 return 0; 3725 } 3726 3727 DiagnoseFunctionSpecifiers(D); 3728 3729 if (!DC->isRecord() && S->getFnParent() == 0) { 3730 // C99 6.9p2: The storage-class specifiers auto and register shall not 3731 // appear in the declaration specifiers in an external declaration. 3732 if (SC == SC_Auto || SC == SC_Register) { 3733 3734 // If this is a register variable with an asm label specified, then this 3735 // is a GNU extension. 3736 if (SC == SC_Register && D.getAsmLabel()) 3737 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3738 else 3739 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3740 D.setInvalidType(); 3741 } 3742 } 3743 3744 if (getLangOptions().OpenCL) { 3745 // Set up the special work-group-local storage class for variables in the 3746 // OpenCL __local address space. 3747 if (R.getAddressSpace() == LangAS::opencl_local) 3748 SC = SC_OpenCLWorkGroupLocal; 3749 } 3750 3751 bool isExplicitSpecialization = false; 3752 VarDecl *NewVD; 3753 if (!getLangOptions().CPlusPlus) { 3754 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3755 D.getIdentifierLoc(), II, 3756 R, TInfo, SC, SCAsWritten); 3757 3758 if (D.isInvalidType()) 3759 NewVD->setInvalidDecl(); 3760 } else { 3761 if (DC->isRecord() && !CurContext->isRecord()) { 3762 // This is an out-of-line definition of a static data member. 3763 if (SC == SC_Static) { 3764 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3765 diag::err_static_out_of_line) 3766 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3767 } else if (SC == SC_None) 3768 SC = SC_Static; 3769 } 3770 if (SC == SC_Static) { 3771 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3772 if (RD->isLocalClass()) 3773 Diag(D.getIdentifierLoc(), 3774 diag::err_static_data_member_not_allowed_in_local_class) 3775 << Name << RD->getDeclName(); 3776 3777 // C++ [class.union]p1: If a union contains a static data member, 3778 // the program is ill-formed. 3779 // 3780 // We also disallow static data members in anonymous structs. 3781 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3782 Diag(D.getIdentifierLoc(), 3783 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3784 << Name << RD->isUnion(); 3785 } 3786 } 3787 3788 // Match up the template parameter lists with the scope specifier, then 3789 // determine whether we have a template or a template specialization. 3790 isExplicitSpecialization = false; 3791 bool Invalid = false; 3792 if (TemplateParameterList *TemplateParams 3793 = MatchTemplateParametersToScopeSpecifier( 3794 D.getDeclSpec().getSourceRange().getBegin(), 3795 D.getIdentifierLoc(), 3796 D.getCXXScopeSpec(), 3797 TemplateParamLists.get(), 3798 TemplateParamLists.size(), 3799 /*never a friend*/ false, 3800 isExplicitSpecialization, 3801 Invalid)) { 3802 if (TemplateParams->size() > 0) { 3803 // There is no such thing as a variable template. 3804 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3805 << II 3806 << SourceRange(TemplateParams->getTemplateLoc(), 3807 TemplateParams->getRAngleLoc()); 3808 return 0; 3809 } else { 3810 // There is an extraneous 'template<>' for this variable. Complain 3811 // about it, but allow the declaration of the variable. 3812 Diag(TemplateParams->getTemplateLoc(), 3813 diag::err_template_variable_noparams) 3814 << II 3815 << SourceRange(TemplateParams->getTemplateLoc(), 3816 TemplateParams->getRAngleLoc()); 3817 } 3818 } 3819 3820 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3821 D.getIdentifierLoc(), II, 3822 R, TInfo, SC, SCAsWritten); 3823 3824 // If this decl has an auto type in need of deduction, make a note of the 3825 // Decl so we can diagnose uses of it in its own initializer. 3826 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3827 R->getContainedAutoType()) 3828 ParsingInitForAutoVars.insert(NewVD); 3829 3830 if (D.isInvalidType() || Invalid) 3831 NewVD->setInvalidDecl(); 3832 3833 SetNestedNameSpecifier(NewVD, D); 3834 3835 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3836 NewVD->setTemplateParameterListsInfo(Context, 3837 TemplateParamLists.size(), 3838 TemplateParamLists.release()); 3839 } 3840 3841 if (D.getDeclSpec().isConstexprSpecified()) { 3842 // FIXME: once we know whether there's an initializer, apply this to 3843 // static data members too. 3844 if (!NewVD->isStaticDataMember() && 3845 !NewVD->isThisDeclarationADefinition()) { 3846 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3847 // of a variable. Suggest replacing it with 'const' if appropriate. 3848 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3849 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3850 // If the declarator is complex, we need to move the keyword to the 3851 // innermost chunk as we switch it from 'constexpr' to 'const'. 3852 int Kind = DeclaratorChunk::Paren; 3853 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3854 Kind = D.getTypeObject(I).Kind; 3855 if (Kind != DeclaratorChunk::Paren) 3856 break; 3857 } 3858 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3859 Kind == DeclaratorChunk::Reference) 3860 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3861 << FixItHint::CreateRemoval(ConstexprRange); 3862 else if (Kind == DeclaratorChunk::Paren) 3863 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3864 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3865 else 3866 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3867 << FixItHint::CreateRemoval(ConstexprRange) 3868 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3869 } else { 3870 NewVD->setConstexpr(true); 3871 } 3872 } 3873 } 3874 3875 // Set the lexical context. If the declarator has a C++ scope specifier, the 3876 // lexical context will be different from the semantic context. 3877 NewVD->setLexicalDeclContext(CurContext); 3878 3879 if (D.getDeclSpec().isThreadSpecified()) { 3880 if (NewVD->hasLocalStorage()) 3881 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3882 else if (!Context.getTargetInfo().isTLSSupported()) 3883 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3884 else 3885 NewVD->setThreadSpecified(true); 3886 } 3887 3888 if (D.getDeclSpec().isModulePrivateSpecified()) { 3889 if (isExplicitSpecialization) 3890 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3891 << 2 3892 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3893 else if (NewVD->hasLocalStorage()) 3894 Diag(NewVD->getLocation(), diag::err_module_private_local) 3895 << 0 << NewVD->getDeclName() 3896 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3897 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3898 else 3899 NewVD->setModulePrivate(); 3900 } 3901 3902 // Handle attributes prior to checking for duplicates in MergeVarDecl 3903 ProcessDeclAttributes(S, NewVD, D); 3904 3905 // In auto-retain/release, infer strong retension for variables of 3906 // retainable type. 3907 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3908 NewVD->setInvalidDecl(); 3909 3910 // Handle GNU asm-label extension (encoded as an attribute). 3911 if (Expr *E = (Expr*)D.getAsmLabel()) { 3912 // The parser guarantees this is a string. 3913 StringLiteral *SE = cast<StringLiteral>(E); 3914 StringRef Label = SE->getString(); 3915 if (S->getFnParent() != 0) { 3916 switch (SC) { 3917 case SC_None: 3918 case SC_Auto: 3919 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3920 break; 3921 case SC_Register: 3922 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3923 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3924 break; 3925 case SC_Static: 3926 case SC_Extern: 3927 case SC_PrivateExtern: 3928 case SC_OpenCLWorkGroupLocal: 3929 break; 3930 } 3931 } 3932 3933 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3934 Context, Label)); 3935 } 3936 3937 // Diagnose shadowed variables before filtering for scope. 3938 if (!D.getCXXScopeSpec().isSet()) 3939 CheckShadow(S, NewVD, Previous); 3940 3941 // Don't consider existing declarations that are in a different 3942 // scope and are out-of-semantic-context declarations (if the new 3943 // declaration has linkage). 3944 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3945 isExplicitSpecialization); 3946 3947 if (!getLangOptions().CPlusPlus) { 3948 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 3949 } else { 3950 // Merge the decl with the existing one if appropriate. 3951 if (!Previous.empty()) { 3952 if (Previous.isSingleResult() && 3953 isa<FieldDecl>(Previous.getFoundDecl()) && 3954 D.getCXXScopeSpec().isSet()) { 3955 // The user tried to define a non-static data member 3956 // out-of-line (C++ [dcl.meaning]p1). 3957 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3958 << D.getCXXScopeSpec().getRange(); 3959 Previous.clear(); 3960 NewVD->setInvalidDecl(); 3961 } 3962 } else if (D.getCXXScopeSpec().isSet()) { 3963 // No previous declaration in the qualifying scope. 3964 Diag(D.getIdentifierLoc(), diag::err_no_member) 3965 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3966 << D.getCXXScopeSpec().getRange(); 3967 NewVD->setInvalidDecl(); 3968 } 3969 3970 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 3971 3972 // This is an explicit specialization of a static data member. Check it. 3973 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3974 CheckMemberSpecialization(NewVD, Previous)) 3975 NewVD->setInvalidDecl(); 3976 } 3977 3978 // attributes declared post-definition are currently ignored 3979 // FIXME: This should be handled in attribute merging, not 3980 // here. 3981 if (Previous.isSingleResult()) { 3982 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3983 if (Def && (Def = Def->getDefinition()) && 3984 Def != NewVD && D.hasAttributes()) { 3985 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3986 Diag(Def->getLocation(), diag::note_previous_definition); 3987 } 3988 } 3989 3990 // If this is a locally-scoped extern C variable, update the map of 3991 // such variables. 3992 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3993 !NewVD->isInvalidDecl()) 3994 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3995 3996 // If there's a #pragma GCC visibility in scope, and this isn't a class 3997 // member, set the visibility of this variable. 3998 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3999 AddPushedVisibilityAttribute(NewVD); 4000 4001 MarkUnusedFileScopedDecl(NewVD); 4002 4003 return NewVD; 4004} 4005 4006/// \brief Diagnose variable or built-in function shadowing. Implements 4007/// -Wshadow. 4008/// 4009/// This method is called whenever a VarDecl is added to a "useful" 4010/// scope. 4011/// 4012/// \param S the scope in which the shadowing name is being declared 4013/// \param R the lookup of the name 4014/// 4015void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4016 // Return if warning is ignored. 4017 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4018 DiagnosticsEngine::Ignored) 4019 return; 4020 4021 // Don't diagnose declarations at file scope. 4022 if (D->hasGlobalStorage()) 4023 return; 4024 4025 DeclContext *NewDC = D->getDeclContext(); 4026 4027 // Only diagnose if we're shadowing an unambiguous field or variable. 4028 if (R.getResultKind() != LookupResult::Found) 4029 return; 4030 4031 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4032 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4033 return; 4034 4035 // Fields are not shadowed by variables in C++ static methods. 4036 if (isa<FieldDecl>(ShadowedDecl)) 4037 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4038 if (MD->isStatic()) 4039 return; 4040 4041 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4042 if (shadowedVar->isExternC()) { 4043 // For shadowing external vars, make sure that we point to the global 4044 // declaration, not a locally scoped extern declaration. 4045 for (VarDecl::redecl_iterator 4046 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4047 I != E; ++I) 4048 if (I->isFileVarDecl()) { 4049 ShadowedDecl = *I; 4050 break; 4051 } 4052 } 4053 4054 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4055 4056 // Only warn about certain kinds of shadowing for class members. 4057 if (NewDC && NewDC->isRecord()) { 4058 // In particular, don't warn about shadowing non-class members. 4059 if (!OldDC->isRecord()) 4060 return; 4061 4062 // TODO: should we warn about static data members shadowing 4063 // static data members from base classes? 4064 4065 // TODO: don't diagnose for inaccessible shadowed members. 4066 // This is hard to do perfectly because we might friend the 4067 // shadowing context, but that's just a false negative. 4068 } 4069 4070 // Determine what kind of declaration we're shadowing. 4071 unsigned Kind; 4072 if (isa<RecordDecl>(OldDC)) { 4073 if (isa<FieldDecl>(ShadowedDecl)) 4074 Kind = 3; // field 4075 else 4076 Kind = 2; // static data member 4077 } else if (OldDC->isFileContext()) 4078 Kind = 1; // global 4079 else 4080 Kind = 0; // local 4081 4082 DeclarationName Name = R.getLookupName(); 4083 4084 // Emit warning and note. 4085 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4086 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4087} 4088 4089/// \brief Check -Wshadow without the advantage of a previous lookup. 4090void Sema::CheckShadow(Scope *S, VarDecl *D) { 4091 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4092 DiagnosticsEngine::Ignored) 4093 return; 4094 4095 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4096 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4097 LookupName(R, S); 4098 CheckShadow(S, D, R); 4099} 4100 4101/// \brief Perform semantic checking on a newly-created variable 4102/// declaration. 4103/// 4104/// This routine performs all of the type-checking required for a 4105/// variable declaration once it has been built. It is used both to 4106/// check variables after they have been parsed and their declarators 4107/// have been translated into a declaration, and to check variables 4108/// that have been instantiated from a template. 4109/// 4110/// Sets NewVD->isInvalidDecl() if an error was encountered. 4111/// 4112/// Returns true if the variable declaration is a redeclaration. 4113bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4114 LookupResult &Previous) { 4115 // If the decl is already known invalid, don't check it. 4116 if (NewVD->isInvalidDecl()) 4117 return false; 4118 4119 QualType T = NewVD->getType(); 4120 4121 if (T->isObjCObjectType()) { 4122 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4123 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4124 T = Context.getObjCObjectPointerType(T); 4125 NewVD->setType(T); 4126 } 4127 4128 // Emit an error if an address space was applied to decl with local storage. 4129 // This includes arrays of objects with address space qualifiers, but not 4130 // automatic variables that point to other address spaces. 4131 // ISO/IEC TR 18037 S5.1.2 4132 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4133 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4134 NewVD->setInvalidDecl(); 4135 return false; 4136 } 4137 4138 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4139 && !NewVD->hasAttr<BlocksAttr>()) { 4140 if (getLangOptions().getGC() != LangOptions::NonGC) 4141 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4142 else 4143 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4144 } 4145 4146 bool isVM = T->isVariablyModifiedType(); 4147 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4148 NewVD->hasAttr<BlocksAttr>()) 4149 getCurFunction()->setHasBranchProtectedScope(); 4150 4151 if ((isVM && NewVD->hasLinkage()) || 4152 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4153 bool SizeIsNegative; 4154 llvm::APSInt Oversized; 4155 QualType FixedTy = 4156 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4157 Oversized); 4158 4159 if (FixedTy.isNull() && T->isVariableArrayType()) { 4160 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4161 // FIXME: This won't give the correct result for 4162 // int a[10][n]; 4163 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4164 4165 if (NewVD->isFileVarDecl()) 4166 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4167 << SizeRange; 4168 else if (NewVD->getStorageClass() == SC_Static) 4169 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4170 << SizeRange; 4171 else 4172 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4173 << SizeRange; 4174 NewVD->setInvalidDecl(); 4175 return false; 4176 } 4177 4178 if (FixedTy.isNull()) { 4179 if (NewVD->isFileVarDecl()) 4180 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4181 else 4182 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4183 NewVD->setInvalidDecl(); 4184 return false; 4185 } 4186 4187 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4188 NewVD->setType(FixedTy); 4189 } 4190 4191 if (Previous.empty() && NewVD->isExternC()) { 4192 // Since we did not find anything by this name and we're declaring 4193 // an extern "C" variable, look for a non-visible extern "C" 4194 // declaration with the same name. 4195 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4196 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4197 if (Pos != LocallyScopedExternalDecls.end()) 4198 Previous.addDecl(Pos->second); 4199 } 4200 4201 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4202 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4203 << T; 4204 NewVD->setInvalidDecl(); 4205 return false; 4206 } 4207 4208 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4209 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4210 NewVD->setInvalidDecl(); 4211 return false; 4212 } 4213 4214 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4215 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4216 NewVD->setInvalidDecl(); 4217 return false; 4218 } 4219 4220 // Function pointers and references cannot have qualified function type, only 4221 // function pointer-to-members can do that. 4222 QualType Pointee; 4223 unsigned PtrOrRef = 0; 4224 if (const PointerType *Ptr = T->getAs<PointerType>()) 4225 Pointee = Ptr->getPointeeType(); 4226 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4227 Pointee = Ref->getPointeeType(); 4228 PtrOrRef = 1; 4229 } 4230 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4231 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4232 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4233 << PtrOrRef; 4234 NewVD->setInvalidDecl(); 4235 return false; 4236 } 4237 4238 if (!Previous.empty()) { 4239 MergeVarDecl(NewVD, Previous); 4240 return true; 4241 } 4242 return false; 4243} 4244 4245/// \brief Data used with FindOverriddenMethod 4246struct FindOverriddenMethodData { 4247 Sema *S; 4248 CXXMethodDecl *Method; 4249}; 4250 4251/// \brief Member lookup function that determines whether a given C++ 4252/// method overrides a method in a base class, to be used with 4253/// CXXRecordDecl::lookupInBases(). 4254static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4255 CXXBasePath &Path, 4256 void *UserData) { 4257 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4258 4259 FindOverriddenMethodData *Data 4260 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4261 4262 DeclarationName Name = Data->Method->getDeclName(); 4263 4264 // FIXME: Do we care about other names here too? 4265 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4266 // We really want to find the base class destructor here. 4267 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4268 CanQualType CT = Data->S->Context.getCanonicalType(T); 4269 4270 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4271 } 4272 4273 for (Path.Decls = BaseRecord->lookup(Name); 4274 Path.Decls.first != Path.Decls.second; 4275 ++Path.Decls.first) { 4276 NamedDecl *D = *Path.Decls.first; 4277 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4278 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4279 return true; 4280 } 4281 } 4282 4283 return false; 4284} 4285 4286/// AddOverriddenMethods - See if a method overrides any in the base classes, 4287/// and if so, check that it's a valid override and remember it. 4288bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4289 // Look for virtual methods in base classes that this method might override. 4290 CXXBasePaths Paths; 4291 FindOverriddenMethodData Data; 4292 Data.Method = MD; 4293 Data.S = this; 4294 bool AddedAny = false; 4295 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4296 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4297 E = Paths.found_decls_end(); I != E; ++I) { 4298 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4299 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4300 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4301 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4302 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4303 AddedAny = true; 4304 } 4305 } 4306 } 4307 } 4308 4309 return AddedAny; 4310} 4311 4312namespace { 4313 // Struct for holding all of the extra arguments needed by 4314 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4315 struct ActOnFDArgs { 4316 Scope *S; 4317 Declarator &D; 4318 MultiTemplateParamsArg TemplateParamLists; 4319 bool AddToScope; 4320 }; 4321} 4322 4323/// \brief Generate diagnostics for an invalid function redeclaration. 4324/// 4325/// This routine handles generating the diagnostic messages for an invalid 4326/// function redeclaration, including finding possible similar declarations 4327/// or performing typo correction if there are no previous declarations with 4328/// the same name. 4329/// 4330/// Returns a NamedDecl iff typo correction was performed and substituting in 4331/// the new declaration name does not cause new errors. 4332static NamedDecl* DiagnoseInvalidRedeclaration( 4333 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4334 ActOnFDArgs &ExtraArgs) { 4335 NamedDecl *Result = NULL; 4336 DeclarationName Name = NewFD->getDeclName(); 4337 DeclContext *NewDC = NewFD->getDeclContext(); 4338 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4339 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4340 llvm::SmallVector<unsigned, 1> MismatchedParams; 4341 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4342 TypoCorrection Correction; 4343 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4344 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4345 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4346 : diag::err_member_def_does_not_match; 4347 4348 NewFD->setInvalidDecl(); 4349 SemaRef.LookupQualifiedName(Prev, NewDC); 4350 assert(!Prev.isAmbiguous() && 4351 "Cannot have an ambiguity in previous-declaration lookup"); 4352 if (!Prev.empty()) { 4353 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4354 Func != FuncEnd; ++Func) { 4355 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4356 if (FD && 4357 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4358 // Add 1 to the index so that 0 can mean the mismatch didn't 4359 // involve a parameter 4360 unsigned ParamNum = 4361 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4362 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4363 } 4364 } 4365 // If the qualified name lookup yielded nothing, try typo correction 4366 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4367 Prev.getLookupKind(), 0, 0, NewDC)) && 4368 Correction.getCorrection() != Name) { 4369 // Trap errors. 4370 Sema::SFINAETrap Trap(SemaRef); 4371 4372 // Set up everything for the call to ActOnFunctionDeclarator 4373 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4374 ExtraArgs.D.getIdentifierLoc()); 4375 Previous.clear(); 4376 Previous.setLookupName(Correction.getCorrection()); 4377 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4378 CDeclEnd = Correction.end(); 4379 CDecl != CDeclEnd; ++CDecl) { 4380 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4381 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4382 MismatchedParams)) { 4383 Previous.addDecl(FD); 4384 } 4385 } 4386 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4387 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4388 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4389 // eliminate the need for the parameter pack ExtraArgs. 4390 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4391 NewFD->getDeclContext(), 4392 NewFD->getTypeSourceInfo(), 4393 Previous, 4394 ExtraArgs.TemplateParamLists, 4395 ExtraArgs.AddToScope); 4396 if (Trap.hasErrorOccurred()) { 4397 // Pretend the typo correction never occurred 4398 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4399 ExtraArgs.D.getIdentifierLoc()); 4400 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4401 Previous.clear(); 4402 Previous.setLookupName(Name); 4403 Result = NULL; 4404 } else { 4405 for (LookupResult::iterator Func = Previous.begin(), 4406 FuncEnd = Previous.end(); 4407 Func != FuncEnd; ++Func) { 4408 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4409 NearMatches.push_back(std::make_pair(FD, 0)); 4410 } 4411 } 4412 if (NearMatches.empty()) { 4413 // Ignore the correction if it didn't yield any close FunctionDecl matches 4414 Correction = TypoCorrection(); 4415 } else { 4416 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4417 : diag::err_member_def_does_not_match_suggest; 4418 } 4419 } 4420 4421 if (Correction) 4422 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4423 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4424 << FixItHint::CreateReplacement( 4425 NewFD->getLocation(), 4426 Correction.getAsString(SemaRef.getLangOptions())); 4427 else 4428 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4429 << Name << NewDC << NewFD->getLocation(); 4430 4431 bool NewFDisConst = false; 4432 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4433 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4434 4435 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4436 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4437 NearMatch != NearMatchEnd; ++NearMatch) { 4438 FunctionDecl *FD = NearMatch->first; 4439 bool FDisConst = false; 4440 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4441 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4442 4443 if (unsigned Idx = NearMatch->second) { 4444 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4445 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4446 diag::note_member_def_close_param_match) 4447 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4448 } else if (Correction) { 4449 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4450 << Correction.getQuoted(SemaRef.getLangOptions()); 4451 } else if (FDisConst != NewFDisConst) { 4452 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4453 << NewFDisConst << FD->getSourceRange().getEnd(); 4454 } else 4455 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4456 } 4457 return Result; 4458} 4459 4460static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) { 4461 switch (D.getDeclSpec().getStorageClassSpec()) { 4462 default: llvm_unreachable("Unknown storage class!"); 4463 case DeclSpec::SCS_auto: 4464 case DeclSpec::SCS_register: 4465 case DeclSpec::SCS_mutable: 4466 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4467 diag::err_typecheck_sclass_func); 4468 D.setInvalidType(); 4469 break; 4470 case DeclSpec::SCS_unspecified: break; 4471 case DeclSpec::SCS_extern: return SC_Extern; 4472 case DeclSpec::SCS_static: { 4473 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4474 // C99 6.7.1p5: 4475 // The declaration of an identifier for a function that has 4476 // block scope shall have no explicit storage-class specifier 4477 // other than extern 4478 // See also (C++ [dcl.stc]p4). 4479 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4480 diag::err_static_block_func); 4481 break; 4482 } else 4483 return SC_Static; 4484 } 4485 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4486 } 4487 4488 // No explicit storage class has already been returned 4489 return SC_None; 4490} 4491 4492static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4493 DeclContext *DC, QualType &R, 4494 TypeSourceInfo *TInfo, 4495 FunctionDecl::StorageClass SC, 4496 bool &IsVirtualOkay) { 4497 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4498 DeclarationName Name = NameInfo.getName(); 4499 4500 FunctionDecl *NewFD = 0; 4501 bool isInline = D.getDeclSpec().isInlineSpecified(); 4502 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4503 FunctionDecl::StorageClass SCAsWritten 4504 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4505 4506 if (!SemaRef.getLangOptions().CPlusPlus) { 4507 // Determine whether the function was written with a 4508 // prototype. This true when: 4509 // - there is a prototype in the declarator, or 4510 // - the type R of the function is some kind of typedef or other reference 4511 // to a type name (which eventually refers to a function type). 4512 bool HasPrototype = 4513 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4514 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4515 4516 NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getSourceRange().getBegin(), 4517 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4518 HasPrototype); 4519 if (D.isInvalidType()) 4520 NewFD->setInvalidDecl(); 4521 4522 // Set the lexical context. 4523 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4524 4525 return NewFD; 4526 } 4527 4528 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4529 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4530 4531 // Check that the return type is not an abstract class type. 4532 // For record types, this is done by the AbstractClassUsageDiagnoser once 4533 // the class has been completely parsed. 4534 if (!DC->isRecord() && 4535 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4536 R->getAs<FunctionType>()->getResultType(), 4537 diag::err_abstract_type_in_decl, 4538 SemaRef.AbstractReturnType)) 4539 D.setInvalidType(); 4540 4541 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4542 // This is a C++ constructor declaration. 4543 assert(DC->isRecord() && 4544 "Constructors can only be declared in a member context"); 4545 4546 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4547 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4548 D.getSourceRange().getBegin(), NameInfo, 4549 R, TInfo, isExplicit, isInline, 4550 /*isImplicitlyDeclared=*/false, 4551 isConstexpr); 4552 4553 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4554 // This is a C++ destructor declaration. 4555 if (DC->isRecord()) { 4556 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4557 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4558 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4559 SemaRef.Context, Record, 4560 D.getSourceRange().getBegin(), 4561 NameInfo, R, TInfo, isInline, 4562 /*isImplicitlyDeclared=*/false); 4563 4564 // If the class is complete, then we now create the implicit exception 4565 // specification. If the class is incomplete or dependent, we can't do 4566 // it yet. 4567 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4568 Record->getDefinition() && !Record->isBeingDefined() && 4569 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4570 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4571 } 4572 4573 IsVirtualOkay = true; 4574 return NewDD; 4575 4576 } else { 4577 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4578 D.setInvalidType(); 4579 4580 // Create a FunctionDecl to satisfy the function definition parsing 4581 // code path. 4582 return FunctionDecl::Create(SemaRef.Context, DC, 4583 D.getSourceRange().getBegin(), 4584 D.getIdentifierLoc(), Name, R, TInfo, 4585 SC, SCAsWritten, isInline, 4586 /*hasPrototype=*/true, isConstexpr); 4587 } 4588 4589 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4590 if (!DC->isRecord()) { 4591 SemaRef.Diag(D.getIdentifierLoc(), 4592 diag::err_conv_function_not_member); 4593 return 0; 4594 } 4595 4596 SemaRef.CheckConversionDeclarator(D, R, SC); 4597 IsVirtualOkay = true; 4598 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4599 D.getSourceRange().getBegin(), NameInfo, 4600 R, TInfo, isInline, isExplicit, 4601 isConstexpr, SourceLocation()); 4602 4603 } else if (DC->isRecord()) { 4604 // If the name of the function is the same as the name of the record, 4605 // then this must be an invalid constructor that has a return type. 4606 // (The parser checks for a return type and makes the declarator a 4607 // constructor if it has no return type). 4608 if (Name.getAsIdentifierInfo() && 4609 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4610 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4611 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4612 << SourceRange(D.getIdentifierLoc()); 4613 return 0; 4614 } 4615 4616 bool isStatic = SC == SC_Static; 4617 4618 // [class.free]p1: 4619 // Any allocation function for a class T is a static member 4620 // (even if not explicitly declared static). 4621 if (Name.getCXXOverloadedOperator() == OO_New || 4622 Name.getCXXOverloadedOperator() == OO_Array_New) 4623 isStatic = true; 4624 4625 // [class.free]p6 Any deallocation function for a class X is a static member 4626 // (even if not explicitly declared static). 4627 if (Name.getCXXOverloadedOperator() == OO_Delete || 4628 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4629 isStatic = true; 4630 4631 IsVirtualOkay = !isStatic; 4632 4633 // This is a C++ method declaration. 4634 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4635 D.getSourceRange().getBegin(), NameInfo, R, 4636 TInfo, isStatic, SCAsWritten, isInline, 4637 isConstexpr, SourceLocation()); 4638 4639 } else { 4640 // Determine whether the function was written with a 4641 // prototype. This true when: 4642 // - we're in C++ (where every function has a prototype), 4643 return FunctionDecl::Create(SemaRef.Context, DC, 4644 D.getSourceRange().getBegin(), 4645 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4646 true/*HasPrototype*/, isConstexpr); 4647 } 4648} 4649 4650NamedDecl* 4651Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4652 TypeSourceInfo *TInfo, LookupResult &Previous, 4653 MultiTemplateParamsArg TemplateParamLists, 4654 bool &AddToScope) { 4655 QualType R = TInfo->getType(); 4656 4657 assert(R.getTypePtr()->isFunctionType()); 4658 4659 // TODO: consider using NameInfo for diagnostic. 4660 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4661 DeclarationName Name = NameInfo.getName(); 4662 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4663 4664 if (D.getDeclSpec().isThreadSpecified()) 4665 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4666 4667 // Do not allow returning a objc interface by-value. 4668 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4669 Diag(D.getIdentifierLoc(), 4670 diag::err_object_cannot_be_passed_returned_by_value) << 0 4671 << R->getAs<FunctionType>()->getResultType() 4672 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4673 4674 QualType T = R->getAs<FunctionType>()->getResultType(); 4675 T = Context.getObjCObjectPointerType(T); 4676 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4677 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4678 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4679 FPT->getNumArgs(), EPI); 4680 } 4681 else if (isa<FunctionNoProtoType>(R)) 4682 R = Context.getFunctionNoProtoType(T); 4683 } 4684 4685 bool isFriend = false; 4686 FunctionTemplateDecl *FunctionTemplate = 0; 4687 bool isExplicitSpecialization = false; 4688 bool isFunctionTemplateSpecialization = false; 4689 bool isDependentClassScopeExplicitSpecialization = false; 4690 bool isVirtualOkay = false; 4691 4692 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4693 isVirtualOkay); 4694 if (!NewFD) return 0; 4695 4696 if (getLangOptions().CPlusPlus) { 4697 bool isInline = D.getDeclSpec().isInlineSpecified(); 4698 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4699 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4700 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4701 isFriend = D.getDeclSpec().isFriendSpecified(); 4702 if (isFriend && !isInline && D.isFunctionDefinition()) { 4703 // C++ [class.friend]p5 4704 // A function can be defined in a friend declaration of a 4705 // class . . . . Such a function is implicitly inline. 4706 NewFD->setImplicitlyInline(); 4707 } 4708 4709 SetNestedNameSpecifier(NewFD, D); 4710 isExplicitSpecialization = false; 4711 isFunctionTemplateSpecialization = false; 4712 if (D.isInvalidType()) 4713 NewFD->setInvalidDecl(); 4714 4715 // Set the lexical context. If the declarator has a C++ 4716 // scope specifier, or is the object of a friend declaration, the 4717 // lexical context will be different from the semantic context. 4718 NewFD->setLexicalDeclContext(CurContext); 4719 4720 // Match up the template parameter lists with the scope specifier, then 4721 // determine whether we have a template or a template specialization. 4722 bool Invalid = false; 4723 if (TemplateParameterList *TemplateParams 4724 = MatchTemplateParametersToScopeSpecifier( 4725 D.getDeclSpec().getSourceRange().getBegin(), 4726 D.getIdentifierLoc(), 4727 D.getCXXScopeSpec(), 4728 TemplateParamLists.get(), 4729 TemplateParamLists.size(), 4730 isFriend, 4731 isExplicitSpecialization, 4732 Invalid)) { 4733 if (TemplateParams->size() > 0) { 4734 // This is a function template 4735 4736 // Check that we can declare a template here. 4737 if (CheckTemplateDeclScope(S, TemplateParams)) 4738 return 0; 4739 4740 // A destructor cannot be a template. 4741 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4742 Diag(NewFD->getLocation(), diag::err_destructor_template); 4743 return 0; 4744 } 4745 4746 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4747 NewFD->getLocation(), 4748 Name, TemplateParams, 4749 NewFD); 4750 FunctionTemplate->setLexicalDeclContext(CurContext); 4751 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4752 4753 // For source fidelity, store the other template param lists. 4754 if (TemplateParamLists.size() > 1) { 4755 NewFD->setTemplateParameterListsInfo(Context, 4756 TemplateParamLists.size() - 1, 4757 TemplateParamLists.release()); 4758 } 4759 } else { 4760 // This is a function template specialization. 4761 isFunctionTemplateSpecialization = true; 4762 // For source fidelity, store all the template param lists. 4763 NewFD->setTemplateParameterListsInfo(Context, 4764 TemplateParamLists.size(), 4765 TemplateParamLists.release()); 4766 4767 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4768 if (isFriend) { 4769 // We want to remove the "template<>", found here. 4770 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4771 4772 // If we remove the template<> and the name is not a 4773 // template-id, we're actually silently creating a problem: 4774 // the friend declaration will refer to an untemplated decl, 4775 // and clearly the user wants a template specialization. So 4776 // we need to insert '<>' after the name. 4777 SourceLocation InsertLoc; 4778 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4779 InsertLoc = D.getName().getSourceRange().getEnd(); 4780 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4781 } 4782 4783 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4784 << Name << RemoveRange 4785 << FixItHint::CreateRemoval(RemoveRange) 4786 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4787 } 4788 } 4789 } 4790 else { 4791 // All template param lists were matched against the scope specifier: 4792 // this is NOT (an explicit specialization of) a template. 4793 if (TemplateParamLists.size() > 0) 4794 // For source fidelity, store all the template param lists. 4795 NewFD->setTemplateParameterListsInfo(Context, 4796 TemplateParamLists.size(), 4797 TemplateParamLists.release()); 4798 } 4799 4800 if (Invalid) { 4801 NewFD->setInvalidDecl(); 4802 if (FunctionTemplate) 4803 FunctionTemplate->setInvalidDecl(); 4804 } 4805 4806 // C++ [dcl.fct.spec]p5: 4807 // The virtual specifier shall only be used in declarations of 4808 // nonstatic class member functions that appear within a 4809 // member-specification of a class declaration; see 10.3. 4810 // 4811 if (isVirtual && !NewFD->isInvalidDecl()) { 4812 if (!isVirtualOkay) { 4813 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4814 diag::err_virtual_non_function); 4815 } else if (!CurContext->isRecord()) { 4816 // 'virtual' was specified outside of the class. 4817 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4818 diag::err_virtual_out_of_class) 4819 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4820 } else if (NewFD->getDescribedFunctionTemplate()) { 4821 // C++ [temp.mem]p3: 4822 // A member function template shall not be virtual. 4823 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4824 diag::err_virtual_member_function_template) 4825 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4826 } else { 4827 // Okay: Add virtual to the method. 4828 NewFD->setVirtualAsWritten(true); 4829 } 4830 } 4831 4832 // C++ [dcl.fct.spec]p3: 4833 // The inline specifier shall not appear on a block scope function declaration. 4834 if (isInline && !NewFD->isInvalidDecl()) { 4835 if (CurContext->isFunctionOrMethod()) { 4836 // 'inline' is not allowed on block scope function declaration. 4837 Diag(D.getDeclSpec().getInlineSpecLoc(), 4838 diag::err_inline_declaration_block_scope) << Name 4839 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4840 } 4841 } 4842 4843 // C++ [dcl.fct.spec]p6: 4844 // The explicit specifier shall be used only in the declaration of a 4845 // constructor or conversion function within its class definition; see 12.3.1 4846 // and 12.3.2. 4847 if (isExplicit && !NewFD->isInvalidDecl()) { 4848 if (!CurContext->isRecord()) { 4849 // 'explicit' was specified outside of the class. 4850 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4851 diag::err_explicit_out_of_class) 4852 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4853 } else if (!isa<CXXConstructorDecl>(NewFD) && 4854 !isa<CXXConversionDecl>(NewFD)) { 4855 // 'explicit' was specified on a function that wasn't a constructor 4856 // or conversion function. 4857 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4858 diag::err_explicit_non_ctor_or_conv_function) 4859 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4860 } 4861 } 4862 4863 if (isConstexpr) { 4864 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4865 // are implicitly inline. 4866 NewFD->setImplicitlyInline(); 4867 4868 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4869 // be either constructors or to return a literal type. Therefore, 4870 // destructors cannot be declared constexpr. 4871 if (isa<CXXDestructorDecl>(NewFD)) 4872 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4873 } 4874 4875 // If __module_private__ was specified, mark the function accordingly. 4876 if (D.getDeclSpec().isModulePrivateSpecified()) { 4877 if (isFunctionTemplateSpecialization) { 4878 SourceLocation ModulePrivateLoc 4879 = D.getDeclSpec().getModulePrivateSpecLoc(); 4880 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4881 << 0 4882 << FixItHint::CreateRemoval(ModulePrivateLoc); 4883 } else { 4884 NewFD->setModulePrivate(); 4885 if (FunctionTemplate) 4886 FunctionTemplate->setModulePrivate(); 4887 } 4888 } 4889 4890 if (isFriend) { 4891 // For now, claim that the objects have no previous declaration. 4892 if (FunctionTemplate) { 4893 FunctionTemplate->setObjectOfFriendDecl(false); 4894 FunctionTemplate->setAccess(AS_public); 4895 } 4896 NewFD->setObjectOfFriendDecl(false); 4897 NewFD->setAccess(AS_public); 4898 } 4899 4900 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4901 D.isFunctionDefinition()) { 4902 // A method is implicitly inline if it's defined in its class 4903 // definition. 4904 NewFD->setImplicitlyInline(); 4905 } 4906 4907 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4908 !CurContext->isRecord()) { 4909 // C++ [class.static]p1: 4910 // A data or function member of a class may be declared static 4911 // in a class definition, in which case it is a static member of 4912 // the class. 4913 4914 // Complain about the 'static' specifier if it's on an out-of-line 4915 // member function definition. 4916 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4917 diag::err_static_out_of_line) 4918 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4919 } 4920 } 4921 4922 // Filter out previous declarations that don't match the scope. 4923 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4924 isExplicitSpecialization || 4925 isFunctionTemplateSpecialization); 4926 4927 // Handle GNU asm-label extension (encoded as an attribute). 4928 if (Expr *E = (Expr*) D.getAsmLabel()) { 4929 // The parser guarantees this is a string. 4930 StringLiteral *SE = cast<StringLiteral>(E); 4931 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4932 SE->getString())); 4933 } 4934 4935 // Copy the parameter declarations from the declarator D to the function 4936 // declaration NewFD, if they are available. First scavenge them into Params. 4937 SmallVector<ParmVarDecl*, 16> Params; 4938 if (D.isFunctionDeclarator()) { 4939 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4940 4941 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4942 // function that takes no arguments, not a function that takes a 4943 // single void argument. 4944 // We let through "const void" here because Sema::GetTypeForDeclarator 4945 // already checks for that case. 4946 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4947 FTI.ArgInfo[0].Param && 4948 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4949 // Empty arg list, don't push any params. 4950 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4951 4952 // In C++, the empty parameter-type-list must be spelled "void"; a 4953 // typedef of void is not permitted. 4954 if (getLangOptions().CPlusPlus && 4955 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4956 bool IsTypeAlias = false; 4957 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4958 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4959 else if (const TemplateSpecializationType *TST = 4960 Param->getType()->getAs<TemplateSpecializationType>()) 4961 IsTypeAlias = TST->isTypeAlias(); 4962 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4963 << IsTypeAlias; 4964 } 4965 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4966 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4967 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4968 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4969 Param->setDeclContext(NewFD); 4970 Params.push_back(Param); 4971 4972 if (Param->isInvalidDecl()) 4973 NewFD->setInvalidDecl(); 4974 } 4975 } 4976 4977 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4978 // When we're declaring a function with a typedef, typeof, etc as in the 4979 // following example, we'll need to synthesize (unnamed) 4980 // parameters for use in the declaration. 4981 // 4982 // @code 4983 // typedef void fn(int); 4984 // fn f; 4985 // @endcode 4986 4987 // Synthesize a parameter for each argument type. 4988 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4989 AE = FT->arg_type_end(); AI != AE; ++AI) { 4990 ParmVarDecl *Param = 4991 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4992 Param->setScopeInfo(0, Params.size()); 4993 Params.push_back(Param); 4994 } 4995 } else { 4996 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4997 "Should not need args for typedef of non-prototype fn"); 4998 } 4999 // Finally, we know we have the right number of parameters, install them. 5000 NewFD->setParams(Params); 5001 5002 // Process the non-inheritable attributes on this declaration. 5003 ProcessDeclAttributes(S, NewFD, D, 5004 /*NonInheritable=*/true, /*Inheritable=*/false); 5005 5006 if (!getLangOptions().CPlusPlus) { 5007 // Perform semantic checking on the function declaration. 5008 bool isExplicitSpecialization=false; 5009 if (!NewFD->isInvalidDecl()) { 5010 if (NewFD->getResultType()->isVariablyModifiedType()) { 5011 // Functions returning a variably modified type violate C99 6.7.5.2p2 5012 // because all functions have linkage. 5013 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5014 NewFD->setInvalidDecl(); 5015 } else { 5016 if (NewFD->isMain()) 5017 CheckMain(NewFD, D.getDeclSpec()); 5018 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5019 isExplicitSpecialization)); 5020 } 5021 } 5022 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5023 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5024 "previous declaration set still overloaded"); 5025 } else { 5026 // If the declarator is a template-id, translate the parser's template 5027 // argument list into our AST format. 5028 bool HasExplicitTemplateArgs = false; 5029 TemplateArgumentListInfo TemplateArgs; 5030 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5031 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5032 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5033 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5034 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5035 TemplateId->getTemplateArgs(), 5036 TemplateId->NumArgs); 5037 translateTemplateArguments(TemplateArgsPtr, 5038 TemplateArgs); 5039 TemplateArgsPtr.release(); 5040 5041 HasExplicitTemplateArgs = true; 5042 5043 if (NewFD->isInvalidDecl()) { 5044 HasExplicitTemplateArgs = false; 5045 } else if (FunctionTemplate) { 5046 // Function template with explicit template arguments. 5047 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5048 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5049 5050 HasExplicitTemplateArgs = false; 5051 } else if (!isFunctionTemplateSpecialization && 5052 !D.getDeclSpec().isFriendSpecified()) { 5053 // We have encountered something that the user meant to be a 5054 // specialization (because it has explicitly-specified template 5055 // arguments) but that was not introduced with a "template<>" (or had 5056 // too few of them). 5057 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5058 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5059 << FixItHint::CreateInsertion( 5060 D.getDeclSpec().getSourceRange().getBegin(), 5061 "template<> "); 5062 isFunctionTemplateSpecialization = true; 5063 } else { 5064 // "friend void foo<>(int);" is an implicit specialization decl. 5065 isFunctionTemplateSpecialization = true; 5066 } 5067 } else if (isFriend && isFunctionTemplateSpecialization) { 5068 // This combination is only possible in a recovery case; the user 5069 // wrote something like: 5070 // template <> friend void foo(int); 5071 // which we're recovering from as if the user had written: 5072 // friend void foo<>(int); 5073 // Go ahead and fake up a template id. 5074 HasExplicitTemplateArgs = true; 5075 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5076 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5077 } 5078 5079 // If it's a friend (and only if it's a friend), it's possible 5080 // that either the specialized function type or the specialized 5081 // template is dependent, and therefore matching will fail. In 5082 // this case, don't check the specialization yet. 5083 bool InstantiationDependent = false; 5084 if (isFunctionTemplateSpecialization && isFriend && 5085 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5086 TemplateSpecializationType::anyDependentTemplateArguments( 5087 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5088 InstantiationDependent))) { 5089 assert(HasExplicitTemplateArgs && 5090 "friend function specialization without template args"); 5091 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5092 Previous)) 5093 NewFD->setInvalidDecl(); 5094 } else if (isFunctionTemplateSpecialization) { 5095 if (CurContext->isDependentContext() && CurContext->isRecord() 5096 && !isFriend) { 5097 isDependentClassScopeExplicitSpecialization = true; 5098 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5099 diag::ext_function_specialization_in_class : 5100 diag::err_function_specialization_in_class) 5101 << NewFD->getDeclName(); 5102 } else if (CheckFunctionTemplateSpecialization(NewFD, 5103 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5104 Previous)) 5105 NewFD->setInvalidDecl(); 5106 5107 // C++ [dcl.stc]p1: 5108 // A storage-class-specifier shall not be specified in an explicit 5109 // specialization (14.7.3) 5110 if (SC != SC_None) { 5111 if (SC != NewFD->getStorageClass()) 5112 Diag(NewFD->getLocation(), 5113 diag::err_explicit_specialization_inconsistent_storage_class) 5114 << SC 5115 << FixItHint::CreateRemoval( 5116 D.getDeclSpec().getStorageClassSpecLoc()); 5117 5118 else 5119 Diag(NewFD->getLocation(), 5120 diag::ext_explicit_specialization_storage_class) 5121 << FixItHint::CreateRemoval( 5122 D.getDeclSpec().getStorageClassSpecLoc()); 5123 } 5124 5125 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5126 if (CheckMemberSpecialization(NewFD, Previous)) 5127 NewFD->setInvalidDecl(); 5128 } 5129 5130 // Perform semantic checking on the function declaration. 5131 if (!isDependentClassScopeExplicitSpecialization) { 5132 if (NewFD->isInvalidDecl()) { 5133 // If this is a class member, mark the class invalid immediately. 5134 // This avoids some consistency errors later. 5135 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5136 methodDecl->getParent()->setInvalidDecl(); 5137 } else { 5138 if (NewFD->isMain()) 5139 CheckMain(NewFD, D.getDeclSpec()); 5140 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5141 isExplicitSpecialization)); 5142 } 5143 } 5144 5145 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5146 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5147 "previous declaration set still overloaded"); 5148 5149 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5150 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5151 NewFD->setInvalidDecl(); 5152 5153 NamedDecl *PrincipalDecl = (FunctionTemplate 5154 ? cast<NamedDecl>(FunctionTemplate) 5155 : NewFD); 5156 5157 if (isFriend && D.isRedeclaration()) { 5158 AccessSpecifier Access = AS_public; 5159 if (!NewFD->isInvalidDecl()) 5160 Access = NewFD->getPreviousDeclaration()->getAccess(); 5161 5162 NewFD->setAccess(Access); 5163 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5164 5165 PrincipalDecl->setObjectOfFriendDecl(true); 5166 } 5167 5168 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5169 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5170 PrincipalDecl->setNonMemberOperator(); 5171 5172 // If we have a function template, check the template parameter 5173 // list. This will check and merge default template arguments. 5174 if (FunctionTemplate) { 5175 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5176 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5177 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5178 D.getDeclSpec().isFriendSpecified() 5179 ? (D.isFunctionDefinition() 5180 ? TPC_FriendFunctionTemplateDefinition 5181 : TPC_FriendFunctionTemplate) 5182 : (D.getCXXScopeSpec().isSet() && 5183 DC && DC->isRecord() && 5184 DC->isDependentContext()) 5185 ? TPC_ClassTemplateMember 5186 : TPC_FunctionTemplate); 5187 } 5188 5189 if (NewFD->isInvalidDecl()) { 5190 // Ignore all the rest of this. 5191 } else if (!D.isRedeclaration()) { 5192 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5193 AddToScope }; 5194 // Fake up an access specifier if it's supposed to be a class member. 5195 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5196 NewFD->setAccess(AS_public); 5197 5198 // Qualified decls generally require a previous declaration. 5199 if (D.getCXXScopeSpec().isSet()) { 5200 // ...with the major exception of templated-scope or 5201 // dependent-scope friend declarations. 5202 5203 // TODO: we currently also suppress this check in dependent 5204 // contexts because (1) the parameter depth will be off when 5205 // matching friend templates and (2) we might actually be 5206 // selecting a friend based on a dependent factor. But there 5207 // are situations where these conditions don't apply and we 5208 // can actually do this check immediately. 5209 if (isFriend && 5210 (TemplateParamLists.size() || 5211 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5212 CurContext->isDependentContext())) { 5213 // ignore these 5214 } else { 5215 // The user tried to provide an out-of-line definition for a 5216 // function that is a member of a class or namespace, but there 5217 // was no such member function declared (C++ [class.mfct]p2, 5218 // C++ [namespace.memdef]p2). For example: 5219 // 5220 // class X { 5221 // void f() const; 5222 // }; 5223 // 5224 // void X::f() { } // ill-formed 5225 // 5226 // Complain about this problem, and attempt to suggest close 5227 // matches (e.g., those that differ only in cv-qualifiers and 5228 // whether the parameter types are references). 5229 5230 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5231 NewFD, 5232 ExtraArgs)) { 5233 AddToScope = ExtraArgs.AddToScope; 5234 return Result; 5235 } 5236 } 5237 5238 // Unqualified local friend declarations are required to resolve 5239 // to something. 5240 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5241 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5242 NewFD, 5243 ExtraArgs)) { 5244 AddToScope = ExtraArgs.AddToScope; 5245 return Result; 5246 } 5247 } 5248 5249 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5250 !isFriend && !isFunctionTemplateSpecialization && 5251 !isExplicitSpecialization) { 5252 // An out-of-line member function declaration must also be a 5253 // definition (C++ [dcl.meaning]p1). 5254 // Note that this is not the case for explicit specializations of 5255 // function templates or member functions of class templates, per 5256 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5257 // for compatibility with old SWIG code which likes to generate them. 5258 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5259 << D.getCXXScopeSpec().getRange(); 5260 } 5261 } 5262 5263 5264 // Handle attributes. We need to have merged decls when handling attributes 5265 // (for example to check for conflicts, etc). 5266 // FIXME: This needs to happen before we merge declarations. Then, 5267 // let attribute merging cope with attribute conflicts. 5268 ProcessDeclAttributes(S, NewFD, D, 5269 /*NonInheritable=*/false, /*Inheritable=*/true); 5270 5271 // attributes declared post-definition are currently ignored 5272 // FIXME: This should happen during attribute merging 5273 if (D.isRedeclaration() && Previous.isSingleResult()) { 5274 const FunctionDecl *Def; 5275 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5276 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5277 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5278 Diag(Def->getLocation(), diag::note_previous_definition); 5279 } 5280 } 5281 5282 AddKnownFunctionAttributes(NewFD); 5283 5284 if (NewFD->hasAttr<OverloadableAttr>() && 5285 !NewFD->getType()->getAs<FunctionProtoType>()) { 5286 Diag(NewFD->getLocation(), 5287 diag::err_attribute_overloadable_no_prototype) 5288 << NewFD; 5289 5290 // Turn this into a variadic function with no parameters. 5291 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5292 FunctionProtoType::ExtProtoInfo EPI; 5293 EPI.Variadic = true; 5294 EPI.ExtInfo = FT->getExtInfo(); 5295 5296 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5297 NewFD->setType(R); 5298 } 5299 5300 // If there's a #pragma GCC visibility in scope, and this isn't a class 5301 // member, set the visibility of this function. 5302 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5303 AddPushedVisibilityAttribute(NewFD); 5304 5305 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5306 // marking the function. 5307 AddCFAuditedAttribute(NewFD); 5308 5309 // If this is a locally-scoped extern C function, update the 5310 // map of such names. 5311 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5312 && !NewFD->isInvalidDecl()) 5313 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5314 5315 // Set this FunctionDecl's range up to the right paren. 5316 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5317 5318 if (getLangOptions().CPlusPlus) { 5319 if (FunctionTemplate) { 5320 if (NewFD->isInvalidDecl()) 5321 FunctionTemplate->setInvalidDecl(); 5322 return FunctionTemplate; 5323 } 5324 } 5325 5326 MarkUnusedFileScopedDecl(NewFD); 5327 5328 if (getLangOptions().CUDA) 5329 if (IdentifierInfo *II = NewFD->getIdentifier()) 5330 if (!NewFD->isInvalidDecl() && 5331 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5332 if (II->isStr("cudaConfigureCall")) { 5333 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5334 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5335 5336 Context.setcudaConfigureCallDecl(NewFD); 5337 } 5338 } 5339 5340 // Here we have an function template explicit specialization at class scope. 5341 // The actually specialization will be postponed to template instatiation 5342 // time via the ClassScopeFunctionSpecializationDecl node. 5343 if (isDependentClassScopeExplicitSpecialization) { 5344 ClassScopeFunctionSpecializationDecl *NewSpec = 5345 ClassScopeFunctionSpecializationDecl::Create( 5346 Context, CurContext, SourceLocation(), 5347 cast<CXXMethodDecl>(NewFD)); 5348 CurContext->addDecl(NewSpec); 5349 AddToScope = false; 5350 } 5351 5352 return NewFD; 5353} 5354 5355/// \brief Perform semantic checking of a new function declaration. 5356/// 5357/// Performs semantic analysis of the new function declaration 5358/// NewFD. This routine performs all semantic checking that does not 5359/// require the actual declarator involved in the declaration, and is 5360/// used both for the declaration of functions as they are parsed 5361/// (called via ActOnDeclarator) and for the declaration of functions 5362/// that have been instantiated via C++ template instantiation (called 5363/// via InstantiateDecl). 5364/// 5365/// \param IsExplicitSpecialiation whether this new function declaration is 5366/// an explicit specialization of the previous declaration. 5367/// 5368/// This sets NewFD->isInvalidDecl() to true if there was an error. 5369/// 5370/// Returns true if the function declaration is a redeclaration. 5371bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5372 LookupResult &Previous, 5373 bool IsExplicitSpecialization) { 5374 assert(!NewFD->getResultType()->isVariablyModifiedType() 5375 && "Variably modified return types are not handled here"); 5376 5377 // Check for a previous declaration of this name. 5378 if (Previous.empty() && NewFD->isExternC()) { 5379 // Since we did not find anything by this name and we're declaring 5380 // an extern "C" function, look for a non-visible extern "C" 5381 // declaration with the same name. 5382 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5383 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5384 if (Pos != LocallyScopedExternalDecls.end()) 5385 Previous.addDecl(Pos->second); 5386 } 5387 5388 bool Redeclaration = false; 5389 5390 // Merge or overload the declaration with an existing declaration of 5391 // the same name, if appropriate. 5392 if (!Previous.empty()) { 5393 // Determine whether NewFD is an overload of PrevDecl or 5394 // a declaration that requires merging. If it's an overload, 5395 // there's no more work to do here; we'll just add the new 5396 // function to the scope. 5397 5398 NamedDecl *OldDecl = 0; 5399 if (!AllowOverloadingOfFunction(Previous, Context)) { 5400 Redeclaration = true; 5401 OldDecl = Previous.getFoundDecl(); 5402 } else { 5403 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5404 /*NewIsUsingDecl*/ false)) { 5405 case Ovl_Match: 5406 Redeclaration = true; 5407 break; 5408 5409 case Ovl_NonFunction: 5410 Redeclaration = true; 5411 break; 5412 5413 case Ovl_Overload: 5414 Redeclaration = false; 5415 break; 5416 } 5417 5418 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5419 // If a function name is overloadable in C, then every function 5420 // with that name must be marked "overloadable". 5421 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5422 << Redeclaration << NewFD; 5423 NamedDecl *OverloadedDecl = 0; 5424 if (Redeclaration) 5425 OverloadedDecl = OldDecl; 5426 else if (!Previous.empty()) 5427 OverloadedDecl = Previous.getRepresentativeDecl(); 5428 if (OverloadedDecl) 5429 Diag(OverloadedDecl->getLocation(), 5430 diag::note_attribute_overloadable_prev_overload); 5431 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5432 Context)); 5433 } 5434 } 5435 5436 if (Redeclaration) { 5437 // NewFD and OldDecl represent declarations that need to be 5438 // merged. 5439 if (MergeFunctionDecl(NewFD, OldDecl)) { 5440 NewFD->setInvalidDecl(); 5441 return Redeclaration; 5442 } 5443 5444 Previous.clear(); 5445 Previous.addDecl(OldDecl); 5446 5447 if (FunctionTemplateDecl *OldTemplateDecl 5448 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5449 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5450 FunctionTemplateDecl *NewTemplateDecl 5451 = NewFD->getDescribedFunctionTemplate(); 5452 assert(NewTemplateDecl && "Template/non-template mismatch"); 5453 if (CXXMethodDecl *Method 5454 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5455 Method->setAccess(OldTemplateDecl->getAccess()); 5456 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5457 } 5458 5459 // If this is an explicit specialization of a member that is a function 5460 // template, mark it as a member specialization. 5461 if (IsExplicitSpecialization && 5462 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5463 NewTemplateDecl->setMemberSpecialization(); 5464 assert(OldTemplateDecl->isMemberSpecialization()); 5465 } 5466 5467 if (OldTemplateDecl->isModulePrivate()) 5468 NewTemplateDecl->setModulePrivate(); 5469 5470 } else { 5471 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5472 NewFD->setAccess(OldDecl->getAccess()); 5473 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5474 } 5475 } 5476 } 5477 5478 // Semantic checking for this function declaration (in isolation). 5479 if (getLangOptions().CPlusPlus) { 5480 // C++-specific checks. 5481 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5482 CheckConstructor(Constructor); 5483 } else if (CXXDestructorDecl *Destructor = 5484 dyn_cast<CXXDestructorDecl>(NewFD)) { 5485 CXXRecordDecl *Record = Destructor->getParent(); 5486 QualType ClassType = Context.getTypeDeclType(Record); 5487 5488 // FIXME: Shouldn't we be able to perform this check even when the class 5489 // type is dependent? Both gcc and edg can handle that. 5490 if (!ClassType->isDependentType()) { 5491 DeclarationName Name 5492 = Context.DeclarationNames.getCXXDestructorName( 5493 Context.getCanonicalType(ClassType)); 5494 if (NewFD->getDeclName() != Name) { 5495 Diag(NewFD->getLocation(), diag::err_destructor_name); 5496 NewFD->setInvalidDecl(); 5497 return Redeclaration; 5498 } 5499 } 5500 } else if (CXXConversionDecl *Conversion 5501 = dyn_cast<CXXConversionDecl>(NewFD)) { 5502 ActOnConversionDeclarator(Conversion); 5503 } 5504 5505 // Find any virtual functions that this function overrides. 5506 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5507 if (!Method->isFunctionTemplateSpecialization() && 5508 !Method->getDescribedFunctionTemplate()) { 5509 if (AddOverriddenMethods(Method->getParent(), Method)) { 5510 // If the function was marked as "static", we have a problem. 5511 if (NewFD->getStorageClass() == SC_Static) { 5512 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5513 << NewFD->getDeclName(); 5514 for (CXXMethodDecl::method_iterator 5515 Overridden = Method->begin_overridden_methods(), 5516 OverriddenEnd = Method->end_overridden_methods(); 5517 Overridden != OverriddenEnd; 5518 ++Overridden) { 5519 Diag((*Overridden)->getLocation(), 5520 diag::note_overridden_virtual_function); 5521 } 5522 } 5523 } 5524 } 5525 } 5526 5527 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5528 if (NewFD->isOverloadedOperator() && 5529 CheckOverloadedOperatorDeclaration(NewFD)) { 5530 NewFD->setInvalidDecl(); 5531 return Redeclaration; 5532 } 5533 5534 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5535 if (NewFD->getLiteralIdentifier() && 5536 CheckLiteralOperatorDeclaration(NewFD)) { 5537 NewFD->setInvalidDecl(); 5538 return Redeclaration; 5539 } 5540 5541 // In C++, check default arguments now that we have merged decls. Unless 5542 // the lexical context is the class, because in this case this is done 5543 // during delayed parsing anyway. 5544 if (!CurContext->isRecord()) 5545 CheckCXXDefaultArguments(NewFD); 5546 5547 // If this function declares a builtin function, check the type of this 5548 // declaration against the expected type for the builtin. 5549 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5550 ASTContext::GetBuiltinTypeError Error; 5551 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5552 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5553 // The type of this function differs from the type of the builtin, 5554 // so forget about the builtin entirely. 5555 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5556 } 5557 } 5558 } 5559 return Redeclaration; 5560} 5561 5562void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5563 // C++ [basic.start.main]p3: A program that declares main to be inline 5564 // or static is ill-formed. 5565 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5566 // shall not appear in a declaration of main. 5567 // static main is not an error under C99, but we should warn about it. 5568 if (FD->getStorageClass() == SC_Static) 5569 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5570 ? diag::err_static_main : diag::warn_static_main) 5571 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5572 if (FD->isInlineSpecified()) 5573 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5574 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5575 5576 QualType T = FD->getType(); 5577 assert(T->isFunctionType() && "function decl is not of function type"); 5578 const FunctionType* FT = T->getAs<FunctionType>(); 5579 5580 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5581 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5582 FD->setInvalidDecl(true); 5583 } 5584 5585 // Treat protoless main() as nullary. 5586 if (isa<FunctionNoProtoType>(FT)) return; 5587 5588 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5589 unsigned nparams = FTP->getNumArgs(); 5590 assert(FD->getNumParams() == nparams); 5591 5592 bool HasExtraParameters = (nparams > 3); 5593 5594 // Darwin passes an undocumented fourth argument of type char**. If 5595 // other platforms start sprouting these, the logic below will start 5596 // getting shifty. 5597 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5598 HasExtraParameters = false; 5599 5600 if (HasExtraParameters) { 5601 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5602 FD->setInvalidDecl(true); 5603 nparams = 3; 5604 } 5605 5606 // FIXME: a lot of the following diagnostics would be improved 5607 // if we had some location information about types. 5608 5609 QualType CharPP = 5610 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5611 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5612 5613 for (unsigned i = 0; i < nparams; ++i) { 5614 QualType AT = FTP->getArgType(i); 5615 5616 bool mismatch = true; 5617 5618 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5619 mismatch = false; 5620 else if (Expected[i] == CharPP) { 5621 // As an extension, the following forms are okay: 5622 // char const ** 5623 // char const * const * 5624 // char * const * 5625 5626 QualifierCollector qs; 5627 const PointerType* PT; 5628 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5629 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5630 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5631 qs.removeConst(); 5632 mismatch = !qs.empty(); 5633 } 5634 } 5635 5636 if (mismatch) { 5637 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5638 // TODO: suggest replacing given type with expected type 5639 FD->setInvalidDecl(true); 5640 } 5641 } 5642 5643 if (nparams == 1 && !FD->isInvalidDecl()) { 5644 Diag(FD->getLocation(), diag::warn_main_one_arg); 5645 } 5646 5647 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5648 Diag(FD->getLocation(), diag::err_main_template_decl); 5649 FD->setInvalidDecl(); 5650 } 5651} 5652 5653bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5654 // FIXME: Need strict checking. In C89, we need to check for 5655 // any assignment, increment, decrement, function-calls, or 5656 // commas outside of a sizeof. In C99, it's the same list, 5657 // except that the aforementioned are allowed in unevaluated 5658 // expressions. Everything else falls under the 5659 // "may accept other forms of constant expressions" exception. 5660 // (We never end up here for C++, so the constant expression 5661 // rules there don't matter.) 5662 if (Init->isConstantInitializer(Context, false)) 5663 return false; 5664 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5665 << Init->getSourceRange(); 5666 return true; 5667} 5668 5669namespace { 5670 // Visits an initialization expression to see if OrigDecl is evaluated in 5671 // its own initialization and throws a warning if it does. 5672 class SelfReferenceChecker 5673 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5674 Sema &S; 5675 Decl *OrigDecl; 5676 bool isRecordType; 5677 bool isPODType; 5678 5679 public: 5680 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5681 5682 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5683 S(S), OrigDecl(OrigDecl) { 5684 isPODType = false; 5685 isRecordType = false; 5686 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5687 isPODType = VD->getType().isPODType(S.Context); 5688 isRecordType = VD->getType()->isRecordType(); 5689 } 5690 } 5691 5692 void VisitExpr(Expr *E) { 5693 if (isa<ObjCMessageExpr>(*E)) return; 5694 if (isRecordType) { 5695 Expr *expr = E; 5696 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5697 ValueDecl *VD = ME->getMemberDecl(); 5698 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5699 expr = ME->getBase(); 5700 } 5701 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5702 HandleDeclRefExpr(DRE); 5703 return; 5704 } 5705 } 5706 Inherited::VisitExpr(E); 5707 } 5708 5709 void VisitMemberExpr(MemberExpr *E) { 5710 if (E->getType()->canDecayToPointerType()) return; 5711 if (isa<FieldDecl>(E->getMemberDecl())) 5712 if (DeclRefExpr *DRE 5713 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5714 HandleDeclRefExpr(DRE); 5715 return; 5716 } 5717 Inherited::VisitMemberExpr(E); 5718 } 5719 5720 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5721 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5722 (isRecordType && E->getCastKind() == CK_NoOp)) { 5723 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5724 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5725 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5726 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5727 HandleDeclRefExpr(DRE); 5728 return; 5729 } 5730 } 5731 Inherited::VisitImplicitCastExpr(E); 5732 } 5733 5734 void VisitUnaryOperator(UnaryOperator *E) { 5735 // For POD record types, addresses of its own members are well-defined. 5736 if (isRecordType && isPODType) return; 5737 Inherited::VisitUnaryOperator(E); 5738 } 5739 5740 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5741 Decl* ReferenceDecl = DRE->getDecl(); 5742 if (OrigDecl != ReferenceDecl) return; 5743 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5744 Sema::NotForRedeclaration); 5745 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5746 S.PDiag(diag::warn_uninit_self_reference_in_init) 5747 << Result.getLookupName() 5748 << OrigDecl->getLocation() 5749 << DRE->getSourceRange()); 5750 } 5751 }; 5752} 5753 5754/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5755void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5756 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5757} 5758 5759/// AddInitializerToDecl - Adds the initializer Init to the 5760/// declaration dcl. If DirectInit is true, this is C++ direct 5761/// initialization rather than copy initialization. 5762void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5763 bool DirectInit, bool TypeMayContainAuto) { 5764 // If there is no declaration, there was an error parsing it. Just ignore 5765 // the initializer. 5766 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5767 return; 5768 5769 // Check for self-references within variable initializers. 5770 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5771 // Variables declared within a function/method body are handled 5772 // by a dataflow analysis. 5773 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5774 CheckSelfReference(RealDecl, Init); 5775 } 5776 else { 5777 CheckSelfReference(RealDecl, Init); 5778 } 5779 5780 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5781 // With declarators parsed the way they are, the parser cannot 5782 // distinguish between a normal initializer and a pure-specifier. 5783 // Thus this grotesque test. 5784 IntegerLiteral *IL; 5785 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5786 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5787 CheckPureMethod(Method, Init->getSourceRange()); 5788 else { 5789 Diag(Method->getLocation(), diag::err_member_function_initialization) 5790 << Method->getDeclName() << Init->getSourceRange(); 5791 Method->setInvalidDecl(); 5792 } 5793 return; 5794 } 5795 5796 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5797 if (!VDecl) { 5798 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5799 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5800 RealDecl->setInvalidDecl(); 5801 return; 5802 } 5803 5804 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5805 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5806 TypeSourceInfo *DeducedType = 0; 5807 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5808 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5809 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5810 << Init->getSourceRange(); 5811 if (!DeducedType) { 5812 RealDecl->setInvalidDecl(); 5813 return; 5814 } 5815 VDecl->setTypeSourceInfo(DeducedType); 5816 VDecl->setType(DeducedType->getType()); 5817 5818 // In ARC, infer lifetime. 5819 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5820 VDecl->setInvalidDecl(); 5821 5822 // If this is a redeclaration, check that the type we just deduced matches 5823 // the previously declared type. 5824 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5825 MergeVarDeclTypes(VDecl, Old); 5826 } 5827 5828 5829 // A definition must end up with a complete type, which means it must be 5830 // complete with the restriction that an array type might be completed by the 5831 // initializer; note that later code assumes this restriction. 5832 QualType BaseDeclType = VDecl->getType(); 5833 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5834 BaseDeclType = Array->getElementType(); 5835 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5836 diag::err_typecheck_decl_incomplete_type)) { 5837 RealDecl->setInvalidDecl(); 5838 return; 5839 } 5840 5841 // The variable can not have an abstract class type. 5842 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5843 diag::err_abstract_type_in_decl, 5844 AbstractVariableType)) 5845 VDecl->setInvalidDecl(); 5846 5847 const VarDecl *Def; 5848 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5849 Diag(VDecl->getLocation(), diag::err_redefinition) 5850 << VDecl->getDeclName(); 5851 Diag(Def->getLocation(), diag::note_previous_definition); 5852 VDecl->setInvalidDecl(); 5853 return; 5854 } 5855 5856 const VarDecl* PrevInit = 0; 5857 if (getLangOptions().CPlusPlus) { 5858 // C++ [class.static.data]p4 5859 // If a static data member is of const integral or const 5860 // enumeration type, its declaration in the class definition can 5861 // specify a constant-initializer which shall be an integral 5862 // constant expression (5.19). In that case, the member can appear 5863 // in integral constant expressions. The member shall still be 5864 // defined in a namespace scope if it is used in the program and the 5865 // namespace scope definition shall not contain an initializer. 5866 // 5867 // We already performed a redefinition check above, but for static 5868 // data members we also need to check whether there was an in-class 5869 // declaration with an initializer. 5870 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5871 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5872 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5873 return; 5874 } 5875 5876 if (VDecl->hasLocalStorage()) 5877 getCurFunction()->setHasBranchProtectedScope(); 5878 5879 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5880 VDecl->setInvalidDecl(); 5881 return; 5882 } 5883 } 5884 5885 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5886 // a kernel function cannot be initialized." 5887 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5888 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5889 VDecl->setInvalidDecl(); 5890 return; 5891 } 5892 5893 // Capture the variable that is being initialized and the style of 5894 // initialization. 5895 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5896 5897 // FIXME: Poor source location information. 5898 InitializationKind Kind 5899 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5900 Init->getLocStart(), 5901 Init->getLocEnd()) 5902 : InitializationKind::CreateCopy(VDecl->getLocation(), 5903 Init->getLocStart()); 5904 5905 // Get the decls type and save a reference for later, since 5906 // CheckInitializerTypes may change it. 5907 QualType DclT = VDecl->getType(), SavT = DclT; 5908 if (VDecl->isLocalVarDecl()) { 5909 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5910 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5911 VDecl->setInvalidDecl(); 5912 } else if (!VDecl->isInvalidDecl()) { 5913 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5914 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5915 MultiExprArg(*this, &Init, 1), 5916 &DclT); 5917 if (Result.isInvalid()) { 5918 VDecl->setInvalidDecl(); 5919 return; 5920 } 5921 5922 Init = Result.takeAs<Expr>(); 5923 5924 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5925 // Don't check invalid declarations to avoid emitting useless diagnostics. 5926 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5927 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5928 CheckForConstantInitializer(Init, DclT); 5929 } 5930 } 5931 } else if (VDecl->isStaticDataMember() && 5932 VDecl->getLexicalDeclContext()->isRecord()) { 5933 // This is an in-class initialization for a static data member, e.g., 5934 // 5935 // struct S { 5936 // static const int value = 17; 5937 // }; 5938 5939 // Try to perform the initialization regardless. 5940 if (!VDecl->isInvalidDecl()) { 5941 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5942 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5943 MultiExprArg(*this, &Init, 1), 5944 &DclT); 5945 if (Result.isInvalid()) { 5946 VDecl->setInvalidDecl(); 5947 return; 5948 } 5949 5950 Init = Result.takeAs<Expr>(); 5951 } 5952 5953 // C++ [class.mem]p4: 5954 // A member-declarator can contain a constant-initializer only 5955 // if it declares a static member (9.4) of const integral or 5956 // const enumeration type, see 9.4.2. 5957 // 5958 // C++0x [class.static.data]p3: 5959 // If a non-volatile const static data member is of integral or 5960 // enumeration type, its declaration in the class definition can 5961 // specify a brace-or-equal-initializer in which every initalizer-clause 5962 // that is an assignment-expression is a constant expression. A static 5963 // data member of literal type can be declared in the class definition 5964 // with the constexpr specifier; if so, its declaration shall specify a 5965 // brace-or-equal-initializer in which every initializer-clause that is 5966 // an assignment-expression is a constant expression. 5967 QualType T = VDecl->getType(); 5968 5969 // Do nothing on dependent types. 5970 if (T->isDependentType()) { 5971 5972 // Allow any 'static constexpr' members, whether or not they are of literal 5973 // type. We separately check that the initializer is a constant expression, 5974 // which implicitly requires the member to be of literal type. 5975 } else if (VDecl->isConstexpr()) { 5976 5977 // Require constness. 5978 } else if (!T.isConstQualified()) { 5979 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5980 << Init->getSourceRange(); 5981 VDecl->setInvalidDecl(); 5982 5983 // We allow integer constant expressions in all cases. 5984 } else if (T->isIntegralOrEnumerationType()) { 5985 // Check whether the expression is a constant expression. 5986 SourceLocation Loc; 5987 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5988 // In C++0x, a non-constexpr const static data member with an 5989 // in-class initializer cannot be volatile. 5990 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5991 else if (Init->isValueDependent()) 5992 ; // Nothing to check. 5993 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5994 ; // Ok, it's an ICE! 5995 else if (Init->isEvaluatable(Context)) { 5996 // If we can constant fold the initializer through heroics, accept it, 5997 // but report this as a use of an extension for -pedantic. 5998 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5999 << Init->getSourceRange(); 6000 } else { 6001 // Otherwise, this is some crazy unknown case. Report the issue at the 6002 // location provided by the isIntegerConstantExpr failed check. 6003 Diag(Loc, diag::err_in_class_initializer_non_constant) 6004 << Init->getSourceRange(); 6005 VDecl->setInvalidDecl(); 6006 } 6007 6008 // We allow floating-point constants as an extension. 6009 } else if (T->isFloatingType()) { // also permits complex, which is ok 6010 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6011 << T << Init->getSourceRange(); 6012 if (getLangOptions().CPlusPlus0x) 6013 Diag(VDecl->getLocation(), 6014 diag::note_in_class_initializer_float_type_constexpr) 6015 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6016 6017 if (!Init->isValueDependent() && 6018 !Init->isConstantInitializer(Context, false)) { 6019 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6020 << Init->getSourceRange(); 6021 VDecl->setInvalidDecl(); 6022 } 6023 6024 // Suggest adding 'constexpr' in C++0x for literal types. 6025 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6026 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6027 << T << Init->getSourceRange() 6028 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6029 VDecl->setConstexpr(true); 6030 6031 } else { 6032 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6033 << T << Init->getSourceRange(); 6034 VDecl->setInvalidDecl(); 6035 } 6036 } else if (VDecl->isFileVarDecl()) { 6037 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6038 (!getLangOptions().CPlusPlus || 6039 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6040 Diag(VDecl->getLocation(), diag::warn_extern_init); 6041 if (!VDecl->isInvalidDecl()) { 6042 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6043 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6044 MultiExprArg(*this, &Init, 1), 6045 &DclT); 6046 if (Result.isInvalid()) { 6047 VDecl->setInvalidDecl(); 6048 return; 6049 } 6050 6051 Init = Result.takeAs<Expr>(); 6052 } 6053 6054 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6055 // Don't check invalid declarations to avoid emitting useless diagnostics. 6056 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6057 // C99 6.7.8p4. All file scoped initializers need to be constant. 6058 CheckForConstantInitializer(Init, DclT); 6059 } 6060 } 6061 // If the type changed, it means we had an incomplete type that was 6062 // completed by the initializer. For example: 6063 // int ary[] = { 1, 3, 5 }; 6064 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6065 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6066 VDecl->setType(DclT); 6067 Init->setType(DclT); 6068 } 6069 6070 // Check any implicit conversions within the expression. 6071 CheckImplicitConversions(Init, VDecl->getLocation()); 6072 6073 if (!VDecl->isInvalidDecl()) 6074 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6075 6076 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6077 !VDecl->getType()->isDependentType() && 6078 !Init->isTypeDependent() && !Init->isValueDependent() && 6079 !Init->isConstantInitializer(Context, 6080 VDecl->getType()->isReferenceType())) { 6081 // FIXME: Improve this diagnostic to explain why the initializer is not 6082 // a constant expression. 6083 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6084 << VDecl << Init->getSourceRange(); 6085 } 6086 6087 Init = MaybeCreateExprWithCleanups(Init); 6088 // Attach the initializer to the decl. 6089 VDecl->setInit(Init); 6090 6091 CheckCompleteVariableDeclaration(VDecl); 6092} 6093 6094/// ActOnInitializerError - Given that there was an error parsing an 6095/// initializer for the given declaration, try to return to some form 6096/// of sanity. 6097void Sema::ActOnInitializerError(Decl *D) { 6098 // Our main concern here is re-establishing invariants like "a 6099 // variable's type is either dependent or complete". 6100 if (!D || D->isInvalidDecl()) return; 6101 6102 VarDecl *VD = dyn_cast<VarDecl>(D); 6103 if (!VD) return; 6104 6105 // Auto types are meaningless if we can't make sense of the initializer. 6106 if (ParsingInitForAutoVars.count(D)) { 6107 D->setInvalidDecl(); 6108 return; 6109 } 6110 6111 QualType Ty = VD->getType(); 6112 if (Ty->isDependentType()) return; 6113 6114 // Require a complete type. 6115 if (RequireCompleteType(VD->getLocation(), 6116 Context.getBaseElementType(Ty), 6117 diag::err_typecheck_decl_incomplete_type)) { 6118 VD->setInvalidDecl(); 6119 return; 6120 } 6121 6122 // Require an abstract type. 6123 if (RequireNonAbstractType(VD->getLocation(), Ty, 6124 diag::err_abstract_type_in_decl, 6125 AbstractVariableType)) { 6126 VD->setInvalidDecl(); 6127 return; 6128 } 6129 6130 // Don't bother complaining about constructors or destructors, 6131 // though. 6132} 6133 6134void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6135 bool TypeMayContainAuto) { 6136 // If there is no declaration, there was an error parsing it. Just ignore it. 6137 if (RealDecl == 0) 6138 return; 6139 6140 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6141 QualType Type = Var->getType(); 6142 6143 // C++0x [dcl.spec.auto]p3 6144 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6145 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6146 << Var->getDeclName() << Type; 6147 Var->setInvalidDecl(); 6148 return; 6149 } 6150 6151 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6152 // have an initializer. 6153 // C++0x [class.static.data]p3: A static data member can be declared with 6154 // the constexpr specifier; if so, its declaration shall specify 6155 // a brace-or-equal-initializer. 6156 // 6157 // A static data member's definition may inherit an initializer from an 6158 // in-class declaration. 6159 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6160 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6161 << Var->getDeclName(); 6162 Var->setInvalidDecl(); 6163 return; 6164 } 6165 6166 switch (Var->isThisDeclarationADefinition()) { 6167 case VarDecl::Definition: 6168 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6169 break; 6170 6171 // We have an out-of-line definition of a static data member 6172 // that has an in-class initializer, so we type-check this like 6173 // a declaration. 6174 // 6175 // Fall through 6176 6177 case VarDecl::DeclarationOnly: 6178 // It's only a declaration. 6179 6180 // Block scope. C99 6.7p7: If an identifier for an object is 6181 // declared with no linkage (C99 6.2.2p6), the type for the 6182 // object shall be complete. 6183 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6184 !Var->getLinkage() && !Var->isInvalidDecl() && 6185 RequireCompleteType(Var->getLocation(), Type, 6186 diag::err_typecheck_decl_incomplete_type)) 6187 Var->setInvalidDecl(); 6188 6189 // Make sure that the type is not abstract. 6190 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6191 RequireNonAbstractType(Var->getLocation(), Type, 6192 diag::err_abstract_type_in_decl, 6193 AbstractVariableType)) 6194 Var->setInvalidDecl(); 6195 return; 6196 6197 case VarDecl::TentativeDefinition: 6198 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6199 // object that has file scope without an initializer, and without a 6200 // storage-class specifier or with the storage-class specifier "static", 6201 // constitutes a tentative definition. Note: A tentative definition with 6202 // external linkage is valid (C99 6.2.2p5). 6203 if (!Var->isInvalidDecl()) { 6204 if (const IncompleteArrayType *ArrayT 6205 = Context.getAsIncompleteArrayType(Type)) { 6206 if (RequireCompleteType(Var->getLocation(), 6207 ArrayT->getElementType(), 6208 diag::err_illegal_decl_array_incomplete_type)) 6209 Var->setInvalidDecl(); 6210 } else if (Var->getStorageClass() == SC_Static) { 6211 // C99 6.9.2p3: If the declaration of an identifier for an object is 6212 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6213 // declared type shall not be an incomplete type. 6214 // NOTE: code such as the following 6215 // static struct s; 6216 // struct s { int a; }; 6217 // is accepted by gcc. Hence here we issue a warning instead of 6218 // an error and we do not invalidate the static declaration. 6219 // NOTE: to avoid multiple warnings, only check the first declaration. 6220 if (Var->getPreviousDeclaration() == 0) 6221 RequireCompleteType(Var->getLocation(), Type, 6222 diag::ext_typecheck_decl_incomplete_type); 6223 } 6224 } 6225 6226 // Record the tentative definition; we're done. 6227 if (!Var->isInvalidDecl()) 6228 TentativeDefinitions.push_back(Var); 6229 return; 6230 } 6231 6232 // Provide a specific diagnostic for uninitialized variable 6233 // definitions with incomplete array type. 6234 if (Type->isIncompleteArrayType()) { 6235 Diag(Var->getLocation(), 6236 diag::err_typecheck_incomplete_array_needs_initializer); 6237 Var->setInvalidDecl(); 6238 return; 6239 } 6240 6241 // Provide a specific diagnostic for uninitialized variable 6242 // definitions with reference type. 6243 if (Type->isReferenceType()) { 6244 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6245 << Var->getDeclName() 6246 << SourceRange(Var->getLocation(), Var->getLocation()); 6247 Var->setInvalidDecl(); 6248 return; 6249 } 6250 6251 // Do not attempt to type-check the default initializer for a 6252 // variable with dependent type. 6253 if (Type->isDependentType()) 6254 return; 6255 6256 if (Var->isInvalidDecl()) 6257 return; 6258 6259 if (RequireCompleteType(Var->getLocation(), 6260 Context.getBaseElementType(Type), 6261 diag::err_typecheck_decl_incomplete_type)) { 6262 Var->setInvalidDecl(); 6263 return; 6264 } 6265 6266 // The variable can not have an abstract class type. 6267 if (RequireNonAbstractType(Var->getLocation(), Type, 6268 diag::err_abstract_type_in_decl, 6269 AbstractVariableType)) { 6270 Var->setInvalidDecl(); 6271 return; 6272 } 6273 6274 // Check for jumps past the implicit initializer. C++0x 6275 // clarifies that this applies to a "variable with automatic 6276 // storage duration", not a "local variable". 6277 // C++0x [stmt.dcl]p3 6278 // A program that jumps from a point where a variable with automatic 6279 // storage duration is not in scope to a point where it is in scope is 6280 // ill-formed unless the variable has scalar type, class type with a 6281 // trivial default constructor and a trivial destructor, a cv-qualified 6282 // version of one of these types, or an array of one of the preceding 6283 // types and is declared without an initializer. 6284 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6285 if (const RecordType *Record 6286 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6287 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6288 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6289 (getLangOptions().CPlusPlus0x && 6290 (!CXXRecord->hasTrivialDefaultConstructor() || 6291 !CXXRecord->hasTrivialDestructor()))) 6292 getCurFunction()->setHasBranchProtectedScope(); 6293 } 6294 } 6295 6296 // C++03 [dcl.init]p9: 6297 // If no initializer is specified for an object, and the 6298 // object is of (possibly cv-qualified) non-POD class type (or 6299 // array thereof), the object shall be default-initialized; if 6300 // the object is of const-qualified type, the underlying class 6301 // type shall have a user-declared default 6302 // constructor. Otherwise, if no initializer is specified for 6303 // a non- static object, the object and its subobjects, if 6304 // any, have an indeterminate initial value); if the object 6305 // or any of its subobjects are of const-qualified type, the 6306 // program is ill-formed. 6307 // C++0x [dcl.init]p11: 6308 // If no initializer is specified for an object, the object is 6309 // default-initialized; [...]. 6310 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6311 InitializationKind Kind 6312 = InitializationKind::CreateDefault(Var->getLocation()); 6313 6314 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6315 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6316 MultiExprArg(*this, 0, 0)); 6317 if (Init.isInvalid()) 6318 Var->setInvalidDecl(); 6319 else if (Init.get()) 6320 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6321 6322 CheckCompleteVariableDeclaration(Var); 6323 } 6324} 6325 6326void Sema::ActOnCXXForRangeDecl(Decl *D) { 6327 VarDecl *VD = dyn_cast<VarDecl>(D); 6328 if (!VD) { 6329 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6330 D->setInvalidDecl(); 6331 return; 6332 } 6333 6334 VD->setCXXForRangeDecl(true); 6335 6336 // for-range-declaration cannot be given a storage class specifier. 6337 int Error = -1; 6338 switch (VD->getStorageClassAsWritten()) { 6339 case SC_None: 6340 break; 6341 case SC_Extern: 6342 Error = 0; 6343 break; 6344 case SC_Static: 6345 Error = 1; 6346 break; 6347 case SC_PrivateExtern: 6348 Error = 2; 6349 break; 6350 case SC_Auto: 6351 Error = 3; 6352 break; 6353 case SC_Register: 6354 Error = 4; 6355 break; 6356 case SC_OpenCLWorkGroupLocal: 6357 llvm_unreachable("Unexpected storage class"); 6358 } 6359 if (VD->isConstexpr()) 6360 Error = 5; 6361 if (Error != -1) { 6362 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6363 << VD->getDeclName() << Error; 6364 D->setInvalidDecl(); 6365 } 6366} 6367 6368void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6369 if (var->isInvalidDecl()) return; 6370 6371 // In ARC, don't allow jumps past the implicit initialization of a 6372 // local retaining variable. 6373 if (getLangOptions().ObjCAutoRefCount && 6374 var->hasLocalStorage()) { 6375 switch (var->getType().getObjCLifetime()) { 6376 case Qualifiers::OCL_None: 6377 case Qualifiers::OCL_ExplicitNone: 6378 case Qualifiers::OCL_Autoreleasing: 6379 break; 6380 6381 case Qualifiers::OCL_Weak: 6382 case Qualifiers::OCL_Strong: 6383 getCurFunction()->setHasBranchProtectedScope(); 6384 break; 6385 } 6386 } 6387 6388 // All the following checks are C++ only. 6389 if (!getLangOptions().CPlusPlus) return; 6390 6391 QualType baseType = Context.getBaseElementType(var->getType()); 6392 if (baseType->isDependentType()) return; 6393 6394 // __block variables might require us to capture a copy-initializer. 6395 if (var->hasAttr<BlocksAttr>()) { 6396 // It's currently invalid to ever have a __block variable with an 6397 // array type; should we diagnose that here? 6398 6399 // Regardless, we don't want to ignore array nesting when 6400 // constructing this copy. 6401 QualType type = var->getType(); 6402 6403 if (type->isStructureOrClassType()) { 6404 SourceLocation poi = var->getLocation(); 6405 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6406 ExprResult result = 6407 PerformCopyInitialization( 6408 InitializedEntity::InitializeBlock(poi, type, false), 6409 poi, Owned(varRef)); 6410 if (!result.isInvalid()) { 6411 result = MaybeCreateExprWithCleanups(result); 6412 Expr *init = result.takeAs<Expr>(); 6413 Context.setBlockVarCopyInits(var, init); 6414 } 6415 } 6416 } 6417 6418 // Check for global constructors. 6419 if (!var->getDeclContext()->isDependentContext() && 6420 var->hasGlobalStorage() && 6421 !var->isStaticLocal() && 6422 var->getInit() && 6423 !var->getInit()->isConstantInitializer(Context, 6424 baseType->isReferenceType())) 6425 Diag(var->getLocation(), diag::warn_global_constructor) 6426 << var->getInit()->getSourceRange(); 6427 6428 // Require the destructor. 6429 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6430 FinalizeVarWithDestructor(var, recordType); 6431} 6432 6433/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6434/// any semantic actions necessary after any initializer has been attached. 6435void 6436Sema::FinalizeDeclaration(Decl *ThisDecl) { 6437 // Note that we are no longer parsing the initializer for this declaration. 6438 ParsingInitForAutoVars.erase(ThisDecl); 6439} 6440 6441Sema::DeclGroupPtrTy 6442Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6443 Decl **Group, unsigned NumDecls) { 6444 SmallVector<Decl*, 8> Decls; 6445 6446 if (DS.isTypeSpecOwned()) 6447 Decls.push_back(DS.getRepAsDecl()); 6448 6449 for (unsigned i = 0; i != NumDecls; ++i) 6450 if (Decl *D = Group[i]) 6451 Decls.push_back(D); 6452 6453 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6454 DS.getTypeSpecType() == DeclSpec::TST_auto); 6455} 6456 6457/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6458/// group, performing any necessary semantic checking. 6459Sema::DeclGroupPtrTy 6460Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6461 bool TypeMayContainAuto) { 6462 // C++0x [dcl.spec.auto]p7: 6463 // If the type deduced for the template parameter U is not the same in each 6464 // deduction, the program is ill-formed. 6465 // FIXME: When initializer-list support is added, a distinction is needed 6466 // between the deduced type U and the deduced type which 'auto' stands for. 6467 // auto a = 0, b = { 1, 2, 3 }; 6468 // is legal because the deduced type U is 'int' in both cases. 6469 if (TypeMayContainAuto && NumDecls > 1) { 6470 QualType Deduced; 6471 CanQualType DeducedCanon; 6472 VarDecl *DeducedDecl = 0; 6473 for (unsigned i = 0; i != NumDecls; ++i) { 6474 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6475 AutoType *AT = D->getType()->getContainedAutoType(); 6476 // Don't reissue diagnostics when instantiating a template. 6477 if (AT && D->isInvalidDecl()) 6478 break; 6479 if (AT && AT->isDeduced()) { 6480 QualType U = AT->getDeducedType(); 6481 CanQualType UCanon = Context.getCanonicalType(U); 6482 if (Deduced.isNull()) { 6483 Deduced = U; 6484 DeducedCanon = UCanon; 6485 DeducedDecl = D; 6486 } else if (DeducedCanon != UCanon) { 6487 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6488 diag::err_auto_different_deductions) 6489 << Deduced << DeducedDecl->getDeclName() 6490 << U << D->getDeclName() 6491 << DeducedDecl->getInit()->getSourceRange() 6492 << D->getInit()->getSourceRange(); 6493 D->setInvalidDecl(); 6494 break; 6495 } 6496 } 6497 } 6498 } 6499 } 6500 6501 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6502} 6503 6504 6505/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6506/// to introduce parameters into function prototype scope. 6507Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6508 const DeclSpec &DS = D.getDeclSpec(); 6509 6510 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6511 VarDecl::StorageClass StorageClass = SC_None; 6512 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6513 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6514 StorageClass = SC_Register; 6515 StorageClassAsWritten = SC_Register; 6516 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6517 Diag(DS.getStorageClassSpecLoc(), 6518 diag::err_invalid_storage_class_in_func_decl); 6519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6520 } 6521 6522 if (D.getDeclSpec().isThreadSpecified()) 6523 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6524 if (D.getDeclSpec().isConstexprSpecified()) 6525 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6526 << 0; 6527 6528 DiagnoseFunctionSpecifiers(D); 6529 6530 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6531 QualType parmDeclType = TInfo->getType(); 6532 6533 if (getLangOptions().CPlusPlus) { 6534 // Check that there are no default arguments inside the type of this 6535 // parameter. 6536 CheckExtraCXXDefaultArguments(D); 6537 6538 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6539 if (D.getCXXScopeSpec().isSet()) { 6540 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6541 << D.getCXXScopeSpec().getRange(); 6542 D.getCXXScopeSpec().clear(); 6543 } 6544 } 6545 6546 // Ensure we have a valid name 6547 IdentifierInfo *II = 0; 6548 if (D.hasName()) { 6549 II = D.getIdentifier(); 6550 if (!II) { 6551 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6552 << GetNameForDeclarator(D).getName().getAsString(); 6553 D.setInvalidType(true); 6554 } 6555 } 6556 6557 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6558 if (II) { 6559 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6560 ForRedeclaration); 6561 LookupName(R, S); 6562 if (R.isSingleResult()) { 6563 NamedDecl *PrevDecl = R.getFoundDecl(); 6564 if (PrevDecl->isTemplateParameter()) { 6565 // Maybe we will complain about the shadowed template parameter. 6566 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6567 // Just pretend that we didn't see the previous declaration. 6568 PrevDecl = 0; 6569 } else if (S->isDeclScope(PrevDecl)) { 6570 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6571 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6572 6573 // Recover by removing the name 6574 II = 0; 6575 D.SetIdentifier(0, D.getIdentifierLoc()); 6576 D.setInvalidType(true); 6577 } 6578 } 6579 } 6580 6581 // Temporarily put parameter variables in the translation unit, not 6582 // the enclosing context. This prevents them from accidentally 6583 // looking like class members in C++. 6584 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6585 D.getSourceRange().getBegin(), 6586 D.getIdentifierLoc(), II, 6587 parmDeclType, TInfo, 6588 StorageClass, StorageClassAsWritten); 6589 6590 if (D.isInvalidType()) 6591 New->setInvalidDecl(); 6592 6593 assert(S->isFunctionPrototypeScope()); 6594 assert(S->getFunctionPrototypeDepth() >= 1); 6595 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6596 S->getNextFunctionPrototypeIndex()); 6597 6598 // Add the parameter declaration into this scope. 6599 S->AddDecl(New); 6600 if (II) 6601 IdResolver.AddDecl(New); 6602 6603 ProcessDeclAttributes(S, New, D); 6604 6605 if (D.getDeclSpec().isModulePrivateSpecified()) 6606 Diag(New->getLocation(), diag::err_module_private_local) 6607 << 1 << New->getDeclName() 6608 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6609 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6610 6611 if (New->hasAttr<BlocksAttr>()) { 6612 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6613 } 6614 return New; 6615} 6616 6617/// \brief Synthesizes a variable for a parameter arising from a 6618/// typedef. 6619ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6620 SourceLocation Loc, 6621 QualType T) { 6622 /* FIXME: setting StartLoc == Loc. 6623 Would it be worth to modify callers so as to provide proper source 6624 location for the unnamed parameters, embedding the parameter's type? */ 6625 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6626 T, Context.getTrivialTypeSourceInfo(T, Loc), 6627 SC_None, SC_None, 0); 6628 Param->setImplicit(); 6629 return Param; 6630} 6631 6632void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6633 ParmVarDecl * const *ParamEnd) { 6634 // Don't diagnose unused-parameter errors in template instantiations; we 6635 // will already have done so in the template itself. 6636 if (!ActiveTemplateInstantiations.empty()) 6637 return; 6638 6639 for (; Param != ParamEnd; ++Param) { 6640 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6641 !(*Param)->hasAttr<UnusedAttr>()) { 6642 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6643 << (*Param)->getDeclName(); 6644 } 6645 } 6646} 6647 6648void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6649 ParmVarDecl * const *ParamEnd, 6650 QualType ReturnTy, 6651 NamedDecl *D) { 6652 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6653 return; 6654 6655 // Warn if the return value is pass-by-value and larger than the specified 6656 // threshold. 6657 if (ReturnTy.isPODType(Context)) { 6658 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6659 if (Size > LangOpts.NumLargeByValueCopy) 6660 Diag(D->getLocation(), diag::warn_return_value_size) 6661 << D->getDeclName() << Size; 6662 } 6663 6664 // Warn if any parameter is pass-by-value and larger than the specified 6665 // threshold. 6666 for (; Param != ParamEnd; ++Param) { 6667 QualType T = (*Param)->getType(); 6668 if (!T.isPODType(Context)) 6669 continue; 6670 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6671 if (Size > LangOpts.NumLargeByValueCopy) 6672 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6673 << (*Param)->getDeclName() << Size; 6674 } 6675} 6676 6677ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6678 SourceLocation NameLoc, IdentifierInfo *Name, 6679 QualType T, TypeSourceInfo *TSInfo, 6680 VarDecl::StorageClass StorageClass, 6681 VarDecl::StorageClass StorageClassAsWritten) { 6682 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6683 if (getLangOptions().ObjCAutoRefCount && 6684 T.getObjCLifetime() == Qualifiers::OCL_None && 6685 T->isObjCLifetimeType()) { 6686 6687 Qualifiers::ObjCLifetime lifetime; 6688 6689 // Special cases for arrays: 6690 // - if it's const, use __unsafe_unretained 6691 // - otherwise, it's an error 6692 if (T->isArrayType()) { 6693 if (!T.isConstQualified()) { 6694 DelayedDiagnostics.add( 6695 sema::DelayedDiagnostic::makeForbiddenType( 6696 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6697 } 6698 lifetime = Qualifiers::OCL_ExplicitNone; 6699 } else { 6700 lifetime = T->getObjCARCImplicitLifetime(); 6701 } 6702 T = Context.getLifetimeQualifiedType(T, lifetime); 6703 } 6704 6705 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6706 Context.getAdjustedParameterType(T), 6707 TSInfo, 6708 StorageClass, StorageClassAsWritten, 6709 0); 6710 6711 // Parameters can not be abstract class types. 6712 // For record types, this is done by the AbstractClassUsageDiagnoser once 6713 // the class has been completely parsed. 6714 if (!CurContext->isRecord() && 6715 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6716 AbstractParamType)) 6717 New->setInvalidDecl(); 6718 6719 // Parameter declarators cannot be interface types. All ObjC objects are 6720 // passed by reference. 6721 if (T->isObjCObjectType()) { 6722 Diag(NameLoc, 6723 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6724 << FixItHint::CreateInsertion(NameLoc, "*"); 6725 T = Context.getObjCObjectPointerType(T); 6726 New->setType(T); 6727 } 6728 6729 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6730 // duration shall not be qualified by an address-space qualifier." 6731 // Since all parameters have automatic store duration, they can not have 6732 // an address space. 6733 if (T.getAddressSpace() != 0) { 6734 Diag(NameLoc, diag::err_arg_with_address_space); 6735 New->setInvalidDecl(); 6736 } 6737 6738 return New; 6739} 6740 6741void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6742 SourceLocation LocAfterDecls) { 6743 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6744 6745 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6746 // for a K&R function. 6747 if (!FTI.hasPrototype) { 6748 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6749 --i; 6750 if (FTI.ArgInfo[i].Param == 0) { 6751 llvm::SmallString<256> Code; 6752 llvm::raw_svector_ostream(Code) << " int " 6753 << FTI.ArgInfo[i].Ident->getName() 6754 << ";\n"; 6755 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6756 << FTI.ArgInfo[i].Ident 6757 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6758 6759 // Implicitly declare the argument as type 'int' for lack of a better 6760 // type. 6761 AttributeFactory attrs; 6762 DeclSpec DS(attrs); 6763 const char* PrevSpec; // unused 6764 unsigned DiagID; // unused 6765 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6766 PrevSpec, DiagID); 6767 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6768 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6769 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6770 } 6771 } 6772 } 6773} 6774 6775Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6776 Declarator &D) { 6777 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6778 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6779 Scope *ParentScope = FnBodyScope->getParent(); 6780 6781 D.setFunctionDefinition(true); 6782 Decl *DP = HandleDeclarator(ParentScope, D, 6783 MultiTemplateParamsArg(*this)); 6784 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6785} 6786 6787static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6788 // Don't warn about invalid declarations. 6789 if (FD->isInvalidDecl()) 6790 return false; 6791 6792 // Or declarations that aren't global. 6793 if (!FD->isGlobal()) 6794 return false; 6795 6796 // Don't warn about C++ member functions. 6797 if (isa<CXXMethodDecl>(FD)) 6798 return false; 6799 6800 // Don't warn about 'main'. 6801 if (FD->isMain()) 6802 return false; 6803 6804 // Don't warn about inline functions. 6805 if (FD->isInlined()) 6806 return false; 6807 6808 // Don't warn about function templates. 6809 if (FD->getDescribedFunctionTemplate()) 6810 return false; 6811 6812 // Don't warn about function template specializations. 6813 if (FD->isFunctionTemplateSpecialization()) 6814 return false; 6815 6816 bool MissingPrototype = true; 6817 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6818 Prev; Prev = Prev->getPreviousDeclaration()) { 6819 // Ignore any declarations that occur in function or method 6820 // scope, because they aren't visible from the header. 6821 if (Prev->getDeclContext()->isFunctionOrMethod()) 6822 continue; 6823 6824 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6825 break; 6826 } 6827 6828 return MissingPrototype; 6829} 6830 6831void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6832 // Don't complain if we're in GNU89 mode and the previous definition 6833 // was an extern inline function. 6834 const FunctionDecl *Definition; 6835 if (FD->isDefined(Definition) && 6836 !canRedefineFunction(Definition, getLangOptions())) { 6837 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6838 Definition->getStorageClass() == SC_Extern) 6839 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6840 << FD->getDeclName() << getLangOptions().CPlusPlus; 6841 else 6842 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6843 Diag(Definition->getLocation(), diag::note_previous_definition); 6844 } 6845} 6846 6847Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6848 // Clear the last template instantiation error context. 6849 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6850 6851 if (!D) 6852 return D; 6853 FunctionDecl *FD = 0; 6854 6855 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6856 FD = FunTmpl->getTemplatedDecl(); 6857 else 6858 FD = cast<FunctionDecl>(D); 6859 6860 // Enter a new function scope 6861 PushFunctionScope(); 6862 6863 // See if this is a redefinition. 6864 if (!FD->isLateTemplateParsed()) 6865 CheckForFunctionRedefinition(FD); 6866 6867 // Builtin functions cannot be defined. 6868 if (unsigned BuiltinID = FD->getBuiltinID()) { 6869 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6870 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6871 FD->setInvalidDecl(); 6872 } 6873 } 6874 6875 // The return type of a function definition must be complete 6876 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6877 QualType ResultType = FD->getResultType(); 6878 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6879 !FD->isInvalidDecl() && 6880 RequireCompleteType(FD->getLocation(), ResultType, 6881 diag::err_func_def_incomplete_result)) 6882 FD->setInvalidDecl(); 6883 6884 // GNU warning -Wmissing-prototypes: 6885 // Warn if a global function is defined without a previous 6886 // prototype declaration. This warning is issued even if the 6887 // definition itself provides a prototype. The aim is to detect 6888 // global functions that fail to be declared in header files. 6889 if (ShouldWarnAboutMissingPrototype(FD)) 6890 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6891 6892 if (FnBodyScope) 6893 PushDeclContext(FnBodyScope, FD); 6894 6895 // Check the validity of our function parameters 6896 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6897 /*CheckParameterNames=*/true); 6898 6899 // Introduce our parameters into the function scope 6900 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6901 ParmVarDecl *Param = FD->getParamDecl(p); 6902 Param->setOwningFunction(FD); 6903 6904 // If this has an identifier, add it to the scope stack. 6905 if (Param->getIdentifier() && FnBodyScope) { 6906 CheckShadow(FnBodyScope, Param); 6907 6908 PushOnScopeChains(Param, FnBodyScope); 6909 } 6910 } 6911 6912 // Checking attributes of current function definition 6913 // dllimport attribute. 6914 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6915 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6916 // dllimport attribute cannot be directly applied to definition. 6917 // Microsoft accepts dllimport for functions defined within class scope. 6918 if (!DA->isInherited() && 6919 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6920 Diag(FD->getLocation(), 6921 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6922 << "dllimport"; 6923 FD->setInvalidDecl(); 6924 return FD; 6925 } 6926 6927 // Visual C++ appears to not think this is an issue, so only issue 6928 // a warning when Microsoft extensions are disabled. 6929 if (!LangOpts.MicrosoftExt) { 6930 // If a symbol previously declared dllimport is later defined, the 6931 // attribute is ignored in subsequent references, and a warning is 6932 // emitted. 6933 Diag(FD->getLocation(), 6934 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6935 << FD->getName() << "dllimport"; 6936 } 6937 } 6938 return FD; 6939} 6940 6941/// \brief Given the set of return statements within a function body, 6942/// compute the variables that are subject to the named return value 6943/// optimization. 6944/// 6945/// Each of the variables that is subject to the named return value 6946/// optimization will be marked as NRVO variables in the AST, and any 6947/// return statement that has a marked NRVO variable as its NRVO candidate can 6948/// use the named return value optimization. 6949/// 6950/// This function applies a very simplistic algorithm for NRVO: if every return 6951/// statement in the function has the same NRVO candidate, that candidate is 6952/// the NRVO variable. 6953/// 6954/// FIXME: Employ a smarter algorithm that accounts for multiple return 6955/// statements and the lifetimes of the NRVO candidates. We should be able to 6956/// find a maximal set of NRVO variables. 6957void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6958 ReturnStmt **Returns = Scope->Returns.data(); 6959 6960 const VarDecl *NRVOCandidate = 0; 6961 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6962 if (!Returns[I]->getNRVOCandidate()) 6963 return; 6964 6965 if (!NRVOCandidate) 6966 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6967 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6968 return; 6969 } 6970 6971 if (NRVOCandidate) 6972 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6973} 6974 6975Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6976 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6977} 6978 6979Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6980 bool IsInstantiation) { 6981 FunctionDecl *FD = 0; 6982 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6983 if (FunTmpl) 6984 FD = FunTmpl->getTemplatedDecl(); 6985 else 6986 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6987 6988 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6989 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6990 6991 if (FD) { 6992 FD->setBody(Body); 6993 if (FD->isMain()) { 6994 // C and C++ allow for main to automagically return 0. 6995 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6996 FD->setHasImplicitReturnZero(true); 6997 WP.disableCheckFallThrough(); 6998 } else if (FD->hasAttr<NakedAttr>()) { 6999 // If the function is marked 'naked', don't complain about missing return 7000 // statements. 7001 WP.disableCheckFallThrough(); 7002 } 7003 7004 // MSVC permits the use of pure specifier (=0) on function definition, 7005 // defined at class scope, warn about this non standard construct. 7006 if (getLangOptions().MicrosoftExt && FD->isPure()) 7007 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7008 7009 if (!FD->isInvalidDecl()) { 7010 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7011 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7012 FD->getResultType(), FD); 7013 7014 // If this is a constructor, we need a vtable. 7015 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7016 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7017 7018 computeNRVO(Body, getCurFunction()); 7019 } 7020 7021 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7022 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7023 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7024 MD->setBody(Body); 7025 if (Body) 7026 MD->setEndLoc(Body->getLocEnd()); 7027 if (!MD->isInvalidDecl()) { 7028 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7029 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7030 MD->getResultType(), MD); 7031 7032 if (Body) 7033 computeNRVO(Body, getCurFunction()); 7034 } 7035 if (ObjCShouldCallSuperDealloc) { 7036 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7037 ObjCShouldCallSuperDealloc = false; 7038 } 7039 if (ObjCShouldCallSuperFinalize) { 7040 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7041 ObjCShouldCallSuperFinalize = false; 7042 } 7043 } else { 7044 return 0; 7045 } 7046 7047 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7048 "ObjC methods, which should have been handled in the block above."); 7049 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7050 "ObjC methods, which should have been handled in the block above."); 7051 7052 // Verify and clean out per-function state. 7053 if (Body) { 7054 // C++ constructors that have function-try-blocks can't have return 7055 // statements in the handlers of that block. (C++ [except.handle]p14) 7056 // Verify this. 7057 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7058 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7059 7060 // Verify that gotos and switch cases don't jump into scopes illegally. 7061 if (getCurFunction()->NeedsScopeChecking() && 7062 !dcl->isInvalidDecl() && 7063 !hasAnyUnrecoverableErrorsInThisFunction()) 7064 DiagnoseInvalidJumps(Body); 7065 7066 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7067 if (!Destructor->getParent()->isDependentType()) 7068 CheckDestructor(Destructor); 7069 7070 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7071 Destructor->getParent()); 7072 } 7073 7074 // If any errors have occurred, clear out any temporaries that may have 7075 // been leftover. This ensures that these temporaries won't be picked up for 7076 // deletion in some later function. 7077 if (PP.getDiagnostics().hasErrorOccurred() || 7078 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7079 ExprTemporaries.clear(); 7080 ExprNeedsCleanups = false; 7081 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7082 // Since the body is valid, issue any analysis-based warnings that are 7083 // enabled. 7084 ActivePolicy = &WP; 7085 } 7086 7087 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7088 !CheckConstexprFunctionBody(FD, Body)) 7089 FD->setInvalidDecl(); 7090 7091 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7092 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7093 } 7094 7095 if (!IsInstantiation) 7096 PopDeclContext(); 7097 7098 PopFunctionOrBlockScope(ActivePolicy, dcl); 7099 7100 // If any errors have occurred, clear out any temporaries that may have 7101 // been leftover. This ensures that these temporaries won't be picked up for 7102 // deletion in some later function. 7103 if (getDiagnostics().hasErrorOccurred()) { 7104 ExprTemporaries.clear(); 7105 ExprNeedsCleanups = false; 7106 } 7107 7108 return dcl; 7109} 7110 7111 7112/// When we finish delayed parsing of an attribute, we must attach it to the 7113/// relevant Decl. 7114void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7115 ParsedAttributes &Attrs) { 7116 ProcessDeclAttributeList(S, D, Attrs.getList()); 7117} 7118 7119 7120/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7121/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7122NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7123 IdentifierInfo &II, Scope *S) { 7124 // Before we produce a declaration for an implicitly defined 7125 // function, see whether there was a locally-scoped declaration of 7126 // this name as a function or variable. If so, use that 7127 // (non-visible) declaration, and complain about it. 7128 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7129 = findLocallyScopedExternalDecl(&II); 7130 if (Pos != LocallyScopedExternalDecls.end()) { 7131 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7132 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7133 return Pos->second; 7134 } 7135 7136 // Extension in C99. Legal in C90, but warn about it. 7137 if (II.getName().startswith("__builtin_")) 7138 Diag(Loc, diag::warn_builtin_unknown) << &II; 7139 else if (getLangOptions().C99) 7140 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7141 else 7142 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7143 7144 // Set a Declarator for the implicit definition: int foo(); 7145 const char *Dummy; 7146 AttributeFactory attrFactory; 7147 DeclSpec DS(attrFactory); 7148 unsigned DiagID; 7149 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7150 (void)Error; // Silence warning. 7151 assert(!Error && "Error setting up implicit decl!"); 7152 Declarator D(DS, Declarator::BlockContext); 7153 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7154 0, 0, true, SourceLocation(), 7155 SourceLocation(), 7156 EST_None, SourceLocation(), 7157 0, 0, 0, 0, Loc, Loc, D), 7158 DS.getAttributes(), 7159 SourceLocation()); 7160 D.SetIdentifier(&II, Loc); 7161 7162 // Insert this function into translation-unit scope. 7163 7164 DeclContext *PrevDC = CurContext; 7165 CurContext = Context.getTranslationUnitDecl(); 7166 7167 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7168 FD->setImplicit(); 7169 7170 CurContext = PrevDC; 7171 7172 AddKnownFunctionAttributes(FD); 7173 7174 return FD; 7175} 7176 7177/// \brief Adds any function attributes that we know a priori based on 7178/// the declaration of this function. 7179/// 7180/// These attributes can apply both to implicitly-declared builtins 7181/// (like __builtin___printf_chk) or to library-declared functions 7182/// like NSLog or printf. 7183/// 7184/// We need to check for duplicate attributes both here and where user-written 7185/// attributes are applied to declarations. 7186void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7187 if (FD->isInvalidDecl()) 7188 return; 7189 7190 // If this is a built-in function, map its builtin attributes to 7191 // actual attributes. 7192 if (unsigned BuiltinID = FD->getBuiltinID()) { 7193 // Handle printf-formatting attributes. 7194 unsigned FormatIdx; 7195 bool HasVAListArg; 7196 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7197 if (!FD->getAttr<FormatAttr>()) 7198 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7199 "printf", FormatIdx+1, 7200 HasVAListArg ? 0 : FormatIdx+2)); 7201 } 7202 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7203 HasVAListArg)) { 7204 if (!FD->getAttr<FormatAttr>()) 7205 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7206 "scanf", FormatIdx+1, 7207 HasVAListArg ? 0 : FormatIdx+2)); 7208 } 7209 7210 // Mark const if we don't care about errno and that is the only 7211 // thing preventing the function from being const. This allows 7212 // IRgen to use LLVM intrinsics for such functions. 7213 if (!getLangOptions().MathErrno && 7214 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7215 if (!FD->getAttr<ConstAttr>()) 7216 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7217 } 7218 7219 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7220 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7221 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7222 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7223 } 7224 7225 IdentifierInfo *Name = FD->getIdentifier(); 7226 if (!Name) 7227 return; 7228 if ((!getLangOptions().CPlusPlus && 7229 FD->getDeclContext()->isTranslationUnit()) || 7230 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7231 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7232 LinkageSpecDecl::lang_c)) { 7233 // Okay: this could be a libc/libm/Objective-C function we know 7234 // about. 7235 } else 7236 return; 7237 7238 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7239 // FIXME: NSLog and NSLogv should be target specific 7240 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7241 // FIXME: We known better than our headers. 7242 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7243 } else 7244 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7245 "printf", 1, 7246 Name->isStr("NSLogv") ? 0 : 2)); 7247 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7248 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7249 // target-specific builtins, perhaps? 7250 if (!FD->getAttr<FormatAttr>()) 7251 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7252 "printf", 2, 7253 Name->isStr("vasprintf") ? 0 : 3)); 7254 } 7255} 7256 7257TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7258 TypeSourceInfo *TInfo) { 7259 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7260 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7261 7262 if (!TInfo) { 7263 assert(D.isInvalidType() && "no declarator info for valid type"); 7264 TInfo = Context.getTrivialTypeSourceInfo(T); 7265 } 7266 7267 // Scope manipulation handled by caller. 7268 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7269 D.getSourceRange().getBegin(), 7270 D.getIdentifierLoc(), 7271 D.getIdentifier(), 7272 TInfo); 7273 7274 // Bail out immediately if we have an invalid declaration. 7275 if (D.isInvalidType()) { 7276 NewTD->setInvalidDecl(); 7277 return NewTD; 7278 } 7279 7280 if (D.getDeclSpec().isModulePrivateSpecified()) { 7281 if (CurContext->isFunctionOrMethod()) 7282 Diag(NewTD->getLocation(), diag::err_module_private_local) 7283 << 2 << NewTD->getDeclName() 7284 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7285 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7286 else 7287 NewTD->setModulePrivate(); 7288 } 7289 7290 // C++ [dcl.typedef]p8: 7291 // If the typedef declaration defines an unnamed class (or 7292 // enum), the first typedef-name declared by the declaration 7293 // to be that class type (or enum type) is used to denote the 7294 // class type (or enum type) for linkage purposes only. 7295 // We need to check whether the type was declared in the declaration. 7296 switch (D.getDeclSpec().getTypeSpecType()) { 7297 case TST_enum: 7298 case TST_struct: 7299 case TST_union: 7300 case TST_class: { 7301 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7302 7303 // Do nothing if the tag is not anonymous or already has an 7304 // associated typedef (from an earlier typedef in this decl group). 7305 if (tagFromDeclSpec->getIdentifier()) break; 7306 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7307 7308 // A well-formed anonymous tag must always be a TUK_Definition. 7309 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7310 7311 // The type must match the tag exactly; no qualifiers allowed. 7312 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7313 break; 7314 7315 // Otherwise, set this is the anon-decl typedef for the tag. 7316 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7317 break; 7318 } 7319 7320 default: 7321 break; 7322 } 7323 7324 return NewTD; 7325} 7326 7327 7328/// \brief Determine whether a tag with a given kind is acceptable 7329/// as a redeclaration of the given tag declaration. 7330/// 7331/// \returns true if the new tag kind is acceptable, false otherwise. 7332bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7333 TagTypeKind NewTag, bool isDefinition, 7334 SourceLocation NewTagLoc, 7335 const IdentifierInfo &Name) { 7336 // C++ [dcl.type.elab]p3: 7337 // The class-key or enum keyword present in the 7338 // elaborated-type-specifier shall agree in kind with the 7339 // declaration to which the name in the elaborated-type-specifier 7340 // refers. This rule also applies to the form of 7341 // elaborated-type-specifier that declares a class-name or 7342 // friend class since it can be construed as referring to the 7343 // definition of the class. Thus, in any 7344 // elaborated-type-specifier, the enum keyword shall be used to 7345 // refer to an enumeration (7.2), the union class-key shall be 7346 // used to refer to a union (clause 9), and either the class or 7347 // struct class-key shall be used to refer to a class (clause 9) 7348 // declared using the class or struct class-key. 7349 TagTypeKind OldTag = Previous->getTagKind(); 7350 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7351 if (OldTag == NewTag) 7352 return true; 7353 7354 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7355 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7356 // Warn about the struct/class tag mismatch. 7357 bool isTemplate = false; 7358 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7359 isTemplate = Record->getDescribedClassTemplate(); 7360 7361 if (!ActiveTemplateInstantiations.empty()) { 7362 // In a template instantiation, do not offer fix-its for tag mismatches 7363 // since they usually mess up the template instead of fixing the problem. 7364 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7365 << (NewTag == TTK_Class) << isTemplate << &Name; 7366 return true; 7367 } 7368 7369 if (isDefinition) { 7370 // On definitions, check previous tags and issue a fix-it for each 7371 // one that doesn't match the current tag. 7372 if (Previous->getDefinition()) { 7373 // Don't suggest fix-its for redefinitions. 7374 return true; 7375 } 7376 7377 bool previousMismatch = false; 7378 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7379 E(Previous->redecls_end()); I != E; ++I) { 7380 if (I->getTagKind() != NewTag) { 7381 if (!previousMismatch) { 7382 previousMismatch = true; 7383 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7384 << (NewTag == TTK_Class) << isTemplate << &Name; 7385 } 7386 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7387 << (NewTag == TTK_Class) 7388 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7389 NewTag == TTK_Class? 7390 "class" : "struct"); 7391 } 7392 } 7393 return true; 7394 } 7395 7396 // Check for a previous definition. If current tag and definition 7397 // are same type, do nothing. If no definition, but disagree with 7398 // with previous tag type, give a warning, but no fix-it. 7399 const TagDecl *Redecl = Previous->getDefinition() ? 7400 Previous->getDefinition() : Previous; 7401 if (Redecl->getTagKind() == NewTag) { 7402 return true; 7403 } 7404 7405 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7406 << (NewTag == TTK_Class) 7407 << isTemplate << &Name; 7408 Diag(Redecl->getLocation(), diag::note_previous_use); 7409 7410 // If there is a previous defintion, suggest a fix-it. 7411 if (Previous->getDefinition()) { 7412 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7413 << (Redecl->getTagKind() == TTK_Class) 7414 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7415 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7416 } 7417 7418 return true; 7419 } 7420 return false; 7421} 7422 7423/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7424/// former case, Name will be non-null. In the later case, Name will be null. 7425/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7426/// reference/declaration/definition of a tag. 7427Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7428 SourceLocation KWLoc, CXXScopeSpec &SS, 7429 IdentifierInfo *Name, SourceLocation NameLoc, 7430 AttributeList *Attr, AccessSpecifier AS, 7431 SourceLocation ModulePrivateLoc, 7432 MultiTemplateParamsArg TemplateParameterLists, 7433 bool &OwnedDecl, bool &IsDependent, 7434 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7435 TypeResult UnderlyingType) { 7436 // If this is not a definition, it must have a name. 7437 assert((Name != 0 || TUK == TUK_Definition) && 7438 "Nameless record must be a definition!"); 7439 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7440 7441 OwnedDecl = false; 7442 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7443 7444 // FIXME: Check explicit specializations more carefully. 7445 bool isExplicitSpecialization = false; 7446 bool Invalid = false; 7447 7448 // We only need to do this matching if we have template parameters 7449 // or a scope specifier, which also conveniently avoids this work 7450 // for non-C++ cases. 7451 if (TemplateParameterLists.size() > 0 || 7452 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7453 if (TemplateParameterList *TemplateParams 7454 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7455 TemplateParameterLists.get(), 7456 TemplateParameterLists.size(), 7457 TUK == TUK_Friend, 7458 isExplicitSpecialization, 7459 Invalid)) { 7460 if (TemplateParams->size() > 0) { 7461 // This is a declaration or definition of a class template (which may 7462 // be a member of another template). 7463 7464 if (Invalid) 7465 return 0; 7466 7467 OwnedDecl = false; 7468 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7469 SS, Name, NameLoc, Attr, 7470 TemplateParams, AS, 7471 ModulePrivateLoc, 7472 TemplateParameterLists.size() - 1, 7473 (TemplateParameterList**) TemplateParameterLists.release()); 7474 return Result.get(); 7475 } else { 7476 // The "template<>" header is extraneous. 7477 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7478 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7479 isExplicitSpecialization = true; 7480 } 7481 } 7482 } 7483 7484 // Figure out the underlying type if this a enum declaration. We need to do 7485 // this early, because it's needed to detect if this is an incompatible 7486 // redeclaration. 7487 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7488 7489 if (Kind == TTK_Enum) { 7490 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7491 // No underlying type explicitly specified, or we failed to parse the 7492 // type, default to int. 7493 EnumUnderlying = Context.IntTy.getTypePtr(); 7494 else if (UnderlyingType.get()) { 7495 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7496 // integral type; any cv-qualification is ignored. 7497 TypeSourceInfo *TI = 0; 7498 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7499 EnumUnderlying = TI; 7500 7501 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7502 7503 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7504 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7505 << T; 7506 // Recover by falling back to int. 7507 EnumUnderlying = Context.IntTy.getTypePtr(); 7508 } 7509 7510 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7511 UPPC_FixedUnderlyingType)) 7512 EnumUnderlying = Context.IntTy.getTypePtr(); 7513 7514 } else if (getLangOptions().MicrosoftExt) 7515 // Microsoft enums are always of int type. 7516 EnumUnderlying = Context.IntTy.getTypePtr(); 7517 } 7518 7519 DeclContext *SearchDC = CurContext; 7520 DeclContext *DC = CurContext; 7521 bool isStdBadAlloc = false; 7522 7523 RedeclarationKind Redecl = ForRedeclaration; 7524 if (TUK == TUK_Friend || TUK == TUK_Reference) 7525 Redecl = NotForRedeclaration; 7526 7527 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7528 7529 if (Name && SS.isNotEmpty()) { 7530 // We have a nested-name tag ('struct foo::bar'). 7531 7532 // Check for invalid 'foo::'. 7533 if (SS.isInvalid()) { 7534 Name = 0; 7535 goto CreateNewDecl; 7536 } 7537 7538 // If this is a friend or a reference to a class in a dependent 7539 // context, don't try to make a decl for it. 7540 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7541 DC = computeDeclContext(SS, false); 7542 if (!DC) { 7543 IsDependent = true; 7544 return 0; 7545 } 7546 } else { 7547 DC = computeDeclContext(SS, true); 7548 if (!DC) { 7549 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7550 << SS.getRange(); 7551 return 0; 7552 } 7553 } 7554 7555 if (RequireCompleteDeclContext(SS, DC)) 7556 return 0; 7557 7558 SearchDC = DC; 7559 // Look-up name inside 'foo::'. 7560 LookupQualifiedName(Previous, DC); 7561 7562 if (Previous.isAmbiguous()) 7563 return 0; 7564 7565 if (Previous.empty()) { 7566 // Name lookup did not find anything. However, if the 7567 // nested-name-specifier refers to the current instantiation, 7568 // and that current instantiation has any dependent base 7569 // classes, we might find something at instantiation time: treat 7570 // this as a dependent elaborated-type-specifier. 7571 // But this only makes any sense for reference-like lookups. 7572 if (Previous.wasNotFoundInCurrentInstantiation() && 7573 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7574 IsDependent = true; 7575 return 0; 7576 } 7577 7578 // A tag 'foo::bar' must already exist. 7579 Diag(NameLoc, diag::err_not_tag_in_scope) 7580 << Kind << Name << DC << SS.getRange(); 7581 Name = 0; 7582 Invalid = true; 7583 goto CreateNewDecl; 7584 } 7585 } else if (Name) { 7586 // If this is a named struct, check to see if there was a previous forward 7587 // declaration or definition. 7588 // FIXME: We're looking into outer scopes here, even when we 7589 // shouldn't be. Doing so can result in ambiguities that we 7590 // shouldn't be diagnosing. 7591 LookupName(Previous, S); 7592 7593 if (Previous.isAmbiguous() && 7594 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7595 LookupResult::Filter F = Previous.makeFilter(); 7596 while (F.hasNext()) { 7597 NamedDecl *ND = F.next(); 7598 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7599 F.erase(); 7600 } 7601 F.done(); 7602 } 7603 7604 // Note: there used to be some attempt at recovery here. 7605 if (Previous.isAmbiguous()) 7606 return 0; 7607 7608 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7609 // FIXME: This makes sure that we ignore the contexts associated 7610 // with C structs, unions, and enums when looking for a matching 7611 // tag declaration or definition. See the similar lookup tweak 7612 // in Sema::LookupName; is there a better way to deal with this? 7613 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7614 SearchDC = SearchDC->getParent(); 7615 } 7616 } else if (S->isFunctionPrototypeScope()) { 7617 // If this is an enum declaration in function prototype scope, set its 7618 // initial context to the translation unit. 7619 SearchDC = Context.getTranslationUnitDecl(); 7620 } 7621 7622 if (Previous.isSingleResult() && 7623 Previous.getFoundDecl()->isTemplateParameter()) { 7624 // Maybe we will complain about the shadowed template parameter. 7625 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7626 // Just pretend that we didn't see the previous declaration. 7627 Previous.clear(); 7628 } 7629 7630 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7631 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7632 // This is a declaration of or a reference to "std::bad_alloc". 7633 isStdBadAlloc = true; 7634 7635 if (Previous.empty() && StdBadAlloc) { 7636 // std::bad_alloc has been implicitly declared (but made invisible to 7637 // name lookup). Fill in this implicit declaration as the previous 7638 // declaration, so that the declarations get chained appropriately. 7639 Previous.addDecl(getStdBadAlloc()); 7640 } 7641 } 7642 7643 // If we didn't find a previous declaration, and this is a reference 7644 // (or friend reference), move to the correct scope. In C++, we 7645 // also need to do a redeclaration lookup there, just in case 7646 // there's a shadow friend decl. 7647 if (Name && Previous.empty() && 7648 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7649 if (Invalid) goto CreateNewDecl; 7650 assert(SS.isEmpty()); 7651 7652 if (TUK == TUK_Reference) { 7653 // C++ [basic.scope.pdecl]p5: 7654 // -- for an elaborated-type-specifier of the form 7655 // 7656 // class-key identifier 7657 // 7658 // if the elaborated-type-specifier is used in the 7659 // decl-specifier-seq or parameter-declaration-clause of a 7660 // function defined in namespace scope, the identifier is 7661 // declared as a class-name in the namespace that contains 7662 // the declaration; otherwise, except as a friend 7663 // declaration, the identifier is declared in the smallest 7664 // non-class, non-function-prototype scope that contains the 7665 // declaration. 7666 // 7667 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7668 // C structs and unions. 7669 // 7670 // It is an error in C++ to declare (rather than define) an enum 7671 // type, including via an elaborated type specifier. We'll 7672 // diagnose that later; for now, declare the enum in the same 7673 // scope as we would have picked for any other tag type. 7674 // 7675 // GNU C also supports this behavior as part of its incomplete 7676 // enum types extension, while GNU C++ does not. 7677 // 7678 // Find the context where we'll be declaring the tag. 7679 // FIXME: We would like to maintain the current DeclContext as the 7680 // lexical context, 7681 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7682 SearchDC = SearchDC->getParent(); 7683 7684 // Find the scope where we'll be declaring the tag. 7685 while (S->isClassScope() || 7686 (getLangOptions().CPlusPlus && 7687 S->isFunctionPrototypeScope()) || 7688 ((S->getFlags() & Scope::DeclScope) == 0) || 7689 (S->getEntity() && 7690 ((DeclContext *)S->getEntity())->isTransparentContext())) 7691 S = S->getParent(); 7692 } else { 7693 assert(TUK == TUK_Friend); 7694 // C++ [namespace.memdef]p3: 7695 // If a friend declaration in a non-local class first declares a 7696 // class or function, the friend class or function is a member of 7697 // the innermost enclosing namespace. 7698 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7699 } 7700 7701 // In C++, we need to do a redeclaration lookup to properly 7702 // diagnose some problems. 7703 if (getLangOptions().CPlusPlus) { 7704 Previous.setRedeclarationKind(ForRedeclaration); 7705 LookupQualifiedName(Previous, SearchDC); 7706 } 7707 } 7708 7709 if (!Previous.empty()) { 7710 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7711 7712 // It's okay to have a tag decl in the same scope as a typedef 7713 // which hides a tag decl in the same scope. Finding this 7714 // insanity with a redeclaration lookup can only actually happen 7715 // in C++. 7716 // 7717 // This is also okay for elaborated-type-specifiers, which is 7718 // technically forbidden by the current standard but which is 7719 // okay according to the likely resolution of an open issue; 7720 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7721 if (getLangOptions().CPlusPlus) { 7722 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7723 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7724 TagDecl *Tag = TT->getDecl(); 7725 if (Tag->getDeclName() == Name && 7726 Tag->getDeclContext()->getRedeclContext() 7727 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7728 PrevDecl = Tag; 7729 Previous.clear(); 7730 Previous.addDecl(Tag); 7731 Previous.resolveKind(); 7732 } 7733 } 7734 } 7735 } 7736 7737 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7738 // If this is a use of a previous tag, or if the tag is already declared 7739 // in the same scope (so that the definition/declaration completes or 7740 // rementions the tag), reuse the decl. 7741 if (TUK == TUK_Reference || TUK == TUK_Friend || 7742 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7743 // Make sure that this wasn't declared as an enum and now used as a 7744 // struct or something similar. 7745 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7746 TUK == TUK_Definition, KWLoc, 7747 *Name)) { 7748 bool SafeToContinue 7749 = (PrevTagDecl->getTagKind() != TTK_Enum && 7750 Kind != TTK_Enum); 7751 if (SafeToContinue) 7752 Diag(KWLoc, diag::err_use_with_wrong_tag) 7753 << Name 7754 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7755 PrevTagDecl->getKindName()); 7756 else 7757 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7758 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7759 7760 if (SafeToContinue) 7761 Kind = PrevTagDecl->getTagKind(); 7762 else { 7763 // Recover by making this an anonymous redefinition. 7764 Name = 0; 7765 Previous.clear(); 7766 Invalid = true; 7767 } 7768 } 7769 7770 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7771 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7772 7773 // All conflicts with previous declarations are recovered by 7774 // returning the previous declaration. 7775 if (ScopedEnum != PrevEnum->isScoped()) { 7776 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7777 << PrevEnum->isScoped(); 7778 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7779 return PrevTagDecl; 7780 } 7781 else if (EnumUnderlying && PrevEnum->isFixed()) { 7782 QualType T; 7783 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7784 T = TI->getType(); 7785 else 7786 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7787 7788 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7789 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7790 diag::err_enum_redeclare_type_mismatch) 7791 << T 7792 << PrevEnum->getIntegerType(); 7793 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7794 return PrevTagDecl; 7795 } 7796 } 7797 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7798 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7799 << PrevEnum->isFixed(); 7800 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7801 return PrevTagDecl; 7802 } 7803 } 7804 7805 if (!Invalid) { 7806 // If this is a use, just return the declaration we found. 7807 7808 // FIXME: In the future, return a variant or some other clue 7809 // for the consumer of this Decl to know it doesn't own it. 7810 // For our current ASTs this shouldn't be a problem, but will 7811 // need to be changed with DeclGroups. 7812 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7813 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7814 return PrevTagDecl; 7815 7816 // Diagnose attempts to redefine a tag. 7817 if (TUK == TUK_Definition) { 7818 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7819 // If we're defining a specialization and the previous definition 7820 // is from an implicit instantiation, don't emit an error 7821 // here; we'll catch this in the general case below. 7822 if (!isExplicitSpecialization || 7823 !isa<CXXRecordDecl>(Def) || 7824 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7825 == TSK_ExplicitSpecialization) { 7826 Diag(NameLoc, diag::err_redefinition) << Name; 7827 Diag(Def->getLocation(), diag::note_previous_definition); 7828 // If this is a redefinition, recover by making this 7829 // struct be anonymous, which will make any later 7830 // references get the previous definition. 7831 Name = 0; 7832 Previous.clear(); 7833 Invalid = true; 7834 } 7835 } else { 7836 // If the type is currently being defined, complain 7837 // about a nested redefinition. 7838 const TagType *Tag 7839 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7840 if (Tag->isBeingDefined()) { 7841 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7842 Diag(PrevTagDecl->getLocation(), 7843 diag::note_previous_definition); 7844 Name = 0; 7845 Previous.clear(); 7846 Invalid = true; 7847 } 7848 } 7849 7850 // Okay, this is definition of a previously declared or referenced 7851 // tag PrevDecl. We're going to create a new Decl for it. 7852 } 7853 } 7854 // If we get here we have (another) forward declaration or we 7855 // have a definition. Just create a new decl. 7856 7857 } else { 7858 // If we get here, this is a definition of a new tag type in a nested 7859 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7860 // new decl/type. We set PrevDecl to NULL so that the entities 7861 // have distinct types. 7862 Previous.clear(); 7863 } 7864 // If we get here, we're going to create a new Decl. If PrevDecl 7865 // is non-NULL, it's a definition of the tag declared by 7866 // PrevDecl. If it's NULL, we have a new definition. 7867 7868 7869 // Otherwise, PrevDecl is not a tag, but was found with tag 7870 // lookup. This is only actually possible in C++, where a few 7871 // things like templates still live in the tag namespace. 7872 } else { 7873 assert(getLangOptions().CPlusPlus); 7874 7875 // Use a better diagnostic if an elaborated-type-specifier 7876 // found the wrong kind of type on the first 7877 // (non-redeclaration) lookup. 7878 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7879 !Previous.isForRedeclaration()) { 7880 unsigned Kind = 0; 7881 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7882 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7883 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7884 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7885 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7886 Invalid = true; 7887 7888 // Otherwise, only diagnose if the declaration is in scope. 7889 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7890 isExplicitSpecialization)) { 7891 // do nothing 7892 7893 // Diagnose implicit declarations introduced by elaborated types. 7894 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7895 unsigned Kind = 0; 7896 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7897 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7898 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7899 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7900 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7901 Invalid = true; 7902 7903 // Otherwise it's a declaration. Call out a particularly common 7904 // case here. 7905 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7906 unsigned Kind = 0; 7907 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7908 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7909 << Name << Kind << TND->getUnderlyingType(); 7910 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7911 Invalid = true; 7912 7913 // Otherwise, diagnose. 7914 } else { 7915 // The tag name clashes with something else in the target scope, 7916 // issue an error and recover by making this tag be anonymous. 7917 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7918 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7919 Name = 0; 7920 Invalid = true; 7921 } 7922 7923 // The existing declaration isn't relevant to us; we're in a 7924 // new scope, so clear out the previous declaration. 7925 Previous.clear(); 7926 } 7927 } 7928 7929CreateNewDecl: 7930 7931 TagDecl *PrevDecl = 0; 7932 if (Previous.isSingleResult()) 7933 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7934 7935 // If there is an identifier, use the location of the identifier as the 7936 // location of the decl, otherwise use the location of the struct/union 7937 // keyword. 7938 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7939 7940 // Otherwise, create a new declaration. If there is a previous 7941 // declaration of the same entity, the two will be linked via 7942 // PrevDecl. 7943 TagDecl *New; 7944 7945 bool IsForwardReference = false; 7946 if (Kind == TTK_Enum) { 7947 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7948 // enum X { A, B, C } D; D should chain to X. 7949 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7950 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7951 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7952 // If this is an undefined enum, warn. 7953 if (TUK != TUK_Definition && !Invalid) { 7954 TagDecl *Def; 7955 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7956 // C++0x: 7.2p2: opaque-enum-declaration. 7957 // Conflicts are diagnosed above. Do nothing. 7958 } 7959 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7960 Diag(Loc, diag::ext_forward_ref_enum_def) 7961 << New; 7962 Diag(Def->getLocation(), diag::note_previous_definition); 7963 } else { 7964 unsigned DiagID = diag::ext_forward_ref_enum; 7965 if (getLangOptions().MicrosoftExt) 7966 DiagID = diag::ext_ms_forward_ref_enum; 7967 else if (getLangOptions().CPlusPlus) 7968 DiagID = diag::err_forward_ref_enum; 7969 Diag(Loc, DiagID); 7970 7971 // If this is a forward-declared reference to an enumeration, make a 7972 // note of it; we won't actually be introducing the declaration into 7973 // the declaration context. 7974 if (TUK == TUK_Reference) 7975 IsForwardReference = true; 7976 } 7977 } 7978 7979 if (EnumUnderlying) { 7980 EnumDecl *ED = cast<EnumDecl>(New); 7981 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7982 ED->setIntegerTypeSourceInfo(TI); 7983 else 7984 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7985 ED->setPromotionType(ED->getIntegerType()); 7986 } 7987 7988 } else { 7989 // struct/union/class 7990 7991 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7992 // struct X { int A; } D; D should chain to X. 7993 if (getLangOptions().CPlusPlus) { 7994 // FIXME: Look for a way to use RecordDecl for simple structs. 7995 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7996 cast_or_null<CXXRecordDecl>(PrevDecl)); 7997 7998 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7999 StdBadAlloc = cast<CXXRecordDecl>(New); 8000 } else 8001 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8002 cast_or_null<RecordDecl>(PrevDecl)); 8003 } 8004 8005 // Maybe add qualifier info. 8006 if (SS.isNotEmpty()) { 8007 if (SS.isSet()) { 8008 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8009 if (TemplateParameterLists.size() > 0) { 8010 New->setTemplateParameterListsInfo(Context, 8011 TemplateParameterLists.size(), 8012 (TemplateParameterList**) TemplateParameterLists.release()); 8013 } 8014 } 8015 else 8016 Invalid = true; 8017 } 8018 8019 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8020 // Add alignment attributes if necessary; these attributes are checked when 8021 // the ASTContext lays out the structure. 8022 // 8023 // It is important for implementing the correct semantics that this 8024 // happen here (in act on tag decl). The #pragma pack stack is 8025 // maintained as a result of parser callbacks which can occur at 8026 // many points during the parsing of a struct declaration (because 8027 // the #pragma tokens are effectively skipped over during the 8028 // parsing of the struct). 8029 AddAlignmentAttributesForRecord(RD); 8030 8031 AddMsStructLayoutForRecord(RD); 8032 } 8033 8034 if (PrevDecl && PrevDecl->isModulePrivate()) 8035 New->setModulePrivate(); 8036 else if (ModulePrivateLoc.isValid()) { 8037 if (isExplicitSpecialization) 8038 Diag(New->getLocation(), diag::err_module_private_specialization) 8039 << 2 8040 << FixItHint::CreateRemoval(ModulePrivateLoc); 8041 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8042 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8043 // __module_private__ does not apply to local classes. However, we only 8044 // diagnose this as an error when the declaration specifiers are 8045 // freestanding. Here, we just ignore the __module_private__. 8046 // foobar 8047 else if (!SearchDC->isFunctionOrMethod()) 8048 New->setModulePrivate(); 8049 } 8050 8051 // If this is a specialization of a member class (of a class template), 8052 // check the specialization. 8053 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8054 Invalid = true; 8055 8056 if (Invalid) 8057 New->setInvalidDecl(); 8058 8059 if (Attr) 8060 ProcessDeclAttributeList(S, New, Attr); 8061 8062 // If we're declaring or defining a tag in function prototype scope 8063 // in C, note that this type can only be used within the function. 8064 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8065 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8066 8067 // Set the lexical context. If the tag has a C++ scope specifier, the 8068 // lexical context will be different from the semantic context. 8069 New->setLexicalDeclContext(CurContext); 8070 8071 // Mark this as a friend decl if applicable. 8072 // In Microsoft mode, a friend declaration also acts as a forward 8073 // declaration so we always pass true to setObjectOfFriendDecl to make 8074 // the tag name visible. 8075 if (TUK == TUK_Friend) 8076 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8077 getLangOptions().MicrosoftExt); 8078 8079 // Set the access specifier. 8080 if (!Invalid && SearchDC->isRecord()) 8081 SetMemberAccessSpecifier(New, PrevDecl, AS); 8082 8083 if (TUK == TUK_Definition) 8084 New->startDefinition(); 8085 8086 // If this has an identifier, add it to the scope stack. 8087 if (TUK == TUK_Friend) { 8088 // We might be replacing an existing declaration in the lookup tables; 8089 // if so, borrow its access specifier. 8090 if (PrevDecl) 8091 New->setAccess(PrevDecl->getAccess()); 8092 8093 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8094 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8095 if (Name) // can be null along some error paths 8096 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8097 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8098 } else if (Name) { 8099 S = getNonFieldDeclScope(S); 8100 PushOnScopeChains(New, S, !IsForwardReference); 8101 if (IsForwardReference) 8102 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8103 8104 } else { 8105 CurContext->addDecl(New); 8106 } 8107 8108 // If this is the C FILE type, notify the AST context. 8109 if (IdentifierInfo *II = New->getIdentifier()) 8110 if (!New->isInvalidDecl() && 8111 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8112 II->isStr("FILE")) 8113 Context.setFILEDecl(New); 8114 8115 OwnedDecl = true; 8116 return New; 8117} 8118 8119void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8120 AdjustDeclIfTemplate(TagD); 8121 TagDecl *Tag = cast<TagDecl>(TagD); 8122 8123 // Enter the tag context. 8124 PushDeclContext(S, Tag); 8125} 8126 8127Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8128 assert(isa<ObjCContainerDecl>(IDecl) && 8129 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8130 DeclContext *OCD = cast<DeclContext>(IDecl); 8131 assert(getContainingDC(OCD) == CurContext && 8132 "The next DeclContext should be lexically contained in the current one."); 8133 CurContext = OCD; 8134 return IDecl; 8135} 8136 8137void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8138 SourceLocation FinalLoc, 8139 SourceLocation LBraceLoc) { 8140 AdjustDeclIfTemplate(TagD); 8141 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8142 8143 FieldCollector->StartClass(); 8144 8145 if (!Record->getIdentifier()) 8146 return; 8147 8148 if (FinalLoc.isValid()) 8149 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8150 8151 // C++ [class]p2: 8152 // [...] The class-name is also inserted into the scope of the 8153 // class itself; this is known as the injected-class-name. For 8154 // purposes of access checking, the injected-class-name is treated 8155 // as if it were a public member name. 8156 CXXRecordDecl *InjectedClassName 8157 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8158 Record->getLocStart(), Record->getLocation(), 8159 Record->getIdentifier(), 8160 /*PrevDecl=*/0, 8161 /*DelayTypeCreation=*/true); 8162 Context.getTypeDeclType(InjectedClassName, Record); 8163 InjectedClassName->setImplicit(); 8164 InjectedClassName->setAccess(AS_public); 8165 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8166 InjectedClassName->setDescribedClassTemplate(Template); 8167 PushOnScopeChains(InjectedClassName, S); 8168 assert(InjectedClassName->isInjectedClassName() && 8169 "Broken injected-class-name"); 8170} 8171 8172void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8173 SourceLocation RBraceLoc) { 8174 AdjustDeclIfTemplate(TagD); 8175 TagDecl *Tag = cast<TagDecl>(TagD); 8176 Tag->setRBraceLoc(RBraceLoc); 8177 8178 if (isa<CXXRecordDecl>(Tag)) 8179 FieldCollector->FinishClass(); 8180 8181 // Exit this scope of this tag's definition. 8182 PopDeclContext(); 8183 8184 // Notify the consumer that we've defined a tag. 8185 Consumer.HandleTagDeclDefinition(Tag); 8186} 8187 8188void Sema::ActOnObjCContainerFinishDefinition() { 8189 // Exit this scope of this interface definition. 8190 PopDeclContext(); 8191} 8192 8193void Sema::ActOnObjCTemporaryExitContainerContext() { 8194 OriginalLexicalContext = CurContext; 8195 ActOnObjCContainerFinishDefinition(); 8196} 8197 8198void Sema::ActOnObjCReenterContainerContext() { 8199 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8200 OriginalLexicalContext = 0; 8201} 8202 8203void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8204 AdjustDeclIfTemplate(TagD); 8205 TagDecl *Tag = cast<TagDecl>(TagD); 8206 Tag->setInvalidDecl(); 8207 8208 // We're undoing ActOnTagStartDefinition here, not 8209 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8210 // the FieldCollector. 8211 8212 PopDeclContext(); 8213} 8214 8215// Note that FieldName may be null for anonymous bitfields. 8216bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8217 QualType FieldTy, const Expr *BitWidth, 8218 bool *ZeroWidth) { 8219 // Default to true; that shouldn't confuse checks for emptiness 8220 if (ZeroWidth) 8221 *ZeroWidth = true; 8222 8223 // C99 6.7.2.1p4 - verify the field type. 8224 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8225 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8226 // Handle incomplete types with specific error. 8227 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8228 return true; 8229 if (FieldName) 8230 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8231 << FieldName << FieldTy << BitWidth->getSourceRange(); 8232 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8233 << FieldTy << BitWidth->getSourceRange(); 8234 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8235 UPPC_BitFieldWidth)) 8236 return true; 8237 8238 // If the bit-width is type- or value-dependent, don't try to check 8239 // it now. 8240 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8241 return false; 8242 8243 llvm::APSInt Value; 8244 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8245 return true; 8246 8247 if (Value != 0 && ZeroWidth) 8248 *ZeroWidth = false; 8249 8250 // Zero-width bitfield is ok for anonymous field. 8251 if (Value == 0 && FieldName) 8252 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8253 8254 if (Value.isSigned() && Value.isNegative()) { 8255 if (FieldName) 8256 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8257 << FieldName << Value.toString(10); 8258 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8259 << Value.toString(10); 8260 } 8261 8262 if (!FieldTy->isDependentType()) { 8263 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8264 if (Value.getZExtValue() > TypeSize) { 8265 if (!getLangOptions().CPlusPlus) { 8266 if (FieldName) 8267 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8268 << FieldName << (unsigned)Value.getZExtValue() 8269 << (unsigned)TypeSize; 8270 8271 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8272 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8273 } 8274 8275 if (FieldName) 8276 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8277 << FieldName << (unsigned)Value.getZExtValue() 8278 << (unsigned)TypeSize; 8279 else 8280 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8281 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8282 } 8283 } 8284 8285 return false; 8286} 8287 8288/// ActOnField - Each field of a C struct/union is passed into this in order 8289/// to create a FieldDecl object for it. 8290Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8291 Declarator &D, Expr *BitfieldWidth) { 8292 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8293 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8294 /*HasInit=*/false, AS_public); 8295 return Res; 8296} 8297 8298/// HandleField - Analyze a field of a C struct or a C++ data member. 8299/// 8300FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8301 SourceLocation DeclStart, 8302 Declarator &D, Expr *BitWidth, bool HasInit, 8303 AccessSpecifier AS) { 8304 IdentifierInfo *II = D.getIdentifier(); 8305 SourceLocation Loc = DeclStart; 8306 if (II) Loc = D.getIdentifierLoc(); 8307 8308 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8309 QualType T = TInfo->getType(); 8310 if (getLangOptions().CPlusPlus) { 8311 CheckExtraCXXDefaultArguments(D); 8312 8313 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8314 UPPC_DataMemberType)) { 8315 D.setInvalidType(); 8316 T = Context.IntTy; 8317 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8318 } 8319 } 8320 8321 DiagnoseFunctionSpecifiers(D); 8322 8323 if (D.getDeclSpec().isThreadSpecified()) 8324 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8325 if (D.getDeclSpec().isConstexprSpecified()) 8326 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8327 << 2; 8328 8329 // Check to see if this name was declared as a member previously 8330 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8331 LookupName(Previous, S); 8332 assert((Previous.empty() || Previous.isOverloadedResult() || 8333 Previous.isSingleResult()) 8334 && "Lookup of member name should be either overloaded, single or null"); 8335 8336 // If the name is overloaded then get any declaration else get the single result 8337 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8338 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8339 8340 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8341 // Maybe we will complain about the shadowed template parameter. 8342 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8343 // Just pretend that we didn't see the previous declaration. 8344 PrevDecl = 0; 8345 } 8346 8347 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8348 PrevDecl = 0; 8349 8350 bool Mutable 8351 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8352 SourceLocation TSSL = D.getSourceRange().getBegin(); 8353 FieldDecl *NewFD 8354 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8355 TSSL, AS, PrevDecl, &D); 8356 8357 if (NewFD->isInvalidDecl()) 8358 Record->setInvalidDecl(); 8359 8360 if (D.getDeclSpec().isModulePrivateSpecified()) 8361 NewFD->setModulePrivate(); 8362 8363 if (NewFD->isInvalidDecl() && PrevDecl) { 8364 // Don't introduce NewFD into scope; there's already something 8365 // with the same name in the same scope. 8366 } else if (II) { 8367 PushOnScopeChains(NewFD, S); 8368 } else 8369 Record->addDecl(NewFD); 8370 8371 return NewFD; 8372} 8373 8374/// \brief Build a new FieldDecl and check its well-formedness. 8375/// 8376/// This routine builds a new FieldDecl given the fields name, type, 8377/// record, etc. \p PrevDecl should refer to any previous declaration 8378/// with the same name and in the same scope as the field to be 8379/// created. 8380/// 8381/// \returns a new FieldDecl. 8382/// 8383/// \todo The Declarator argument is a hack. It will be removed once 8384FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8385 TypeSourceInfo *TInfo, 8386 RecordDecl *Record, SourceLocation Loc, 8387 bool Mutable, Expr *BitWidth, bool HasInit, 8388 SourceLocation TSSL, 8389 AccessSpecifier AS, NamedDecl *PrevDecl, 8390 Declarator *D) { 8391 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8392 bool InvalidDecl = false; 8393 if (D) InvalidDecl = D->isInvalidType(); 8394 8395 // If we receive a broken type, recover by assuming 'int' and 8396 // marking this declaration as invalid. 8397 if (T.isNull()) { 8398 InvalidDecl = true; 8399 T = Context.IntTy; 8400 } 8401 8402 QualType EltTy = Context.getBaseElementType(T); 8403 if (!EltTy->isDependentType() && 8404 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8405 // Fields of incomplete type force their record to be invalid. 8406 Record->setInvalidDecl(); 8407 InvalidDecl = true; 8408 } 8409 8410 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8411 // than a variably modified type. 8412 if (!InvalidDecl && T->isVariablyModifiedType()) { 8413 bool SizeIsNegative; 8414 llvm::APSInt Oversized; 8415 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8416 SizeIsNegative, 8417 Oversized); 8418 if (!FixedTy.isNull()) { 8419 Diag(Loc, diag::warn_illegal_constant_array_size); 8420 T = FixedTy; 8421 } else { 8422 if (SizeIsNegative) 8423 Diag(Loc, diag::err_typecheck_negative_array_size); 8424 else if (Oversized.getBoolValue()) 8425 Diag(Loc, diag::err_array_too_large) 8426 << Oversized.toString(10); 8427 else 8428 Diag(Loc, diag::err_typecheck_field_variable_size); 8429 InvalidDecl = true; 8430 } 8431 } 8432 8433 // Fields can not have abstract class types 8434 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8435 diag::err_abstract_type_in_decl, 8436 AbstractFieldType)) 8437 InvalidDecl = true; 8438 8439 bool ZeroWidth = false; 8440 // If this is declared as a bit-field, check the bit-field. 8441 if (!InvalidDecl && BitWidth && 8442 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8443 InvalidDecl = true; 8444 BitWidth = 0; 8445 ZeroWidth = false; 8446 } 8447 8448 // Check that 'mutable' is consistent with the type of the declaration. 8449 if (!InvalidDecl && Mutable) { 8450 unsigned DiagID = 0; 8451 if (T->isReferenceType()) 8452 DiagID = diag::err_mutable_reference; 8453 else if (T.isConstQualified()) 8454 DiagID = diag::err_mutable_const; 8455 8456 if (DiagID) { 8457 SourceLocation ErrLoc = Loc; 8458 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8459 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8460 Diag(ErrLoc, DiagID); 8461 Mutable = false; 8462 InvalidDecl = true; 8463 } 8464 } 8465 8466 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8467 BitWidth, Mutable, HasInit); 8468 if (InvalidDecl) 8469 NewFD->setInvalidDecl(); 8470 8471 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8472 Diag(Loc, diag::err_duplicate_member) << II; 8473 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8474 NewFD->setInvalidDecl(); 8475 } 8476 8477 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8478 if (Record->isUnion()) { 8479 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8480 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8481 if (RDecl->getDefinition()) { 8482 // C++ [class.union]p1: An object of a class with a non-trivial 8483 // constructor, a non-trivial copy constructor, a non-trivial 8484 // destructor, or a non-trivial copy assignment operator 8485 // cannot be a member of a union, nor can an array of such 8486 // objects. 8487 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8488 NewFD->setInvalidDecl(); 8489 } 8490 } 8491 8492 // C++ [class.union]p1: If a union contains a member of reference type, 8493 // the program is ill-formed. 8494 if (EltTy->isReferenceType()) { 8495 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8496 << NewFD->getDeclName() << EltTy; 8497 NewFD->setInvalidDecl(); 8498 } 8499 } 8500 } 8501 8502 // FIXME: We need to pass in the attributes given an AST 8503 // representation, not a parser representation. 8504 if (D) 8505 // FIXME: What to pass instead of TUScope? 8506 ProcessDeclAttributes(TUScope, NewFD, *D); 8507 8508 // In auto-retain/release, infer strong retension for fields of 8509 // retainable type. 8510 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8511 NewFD->setInvalidDecl(); 8512 8513 if (T.isObjCGCWeak()) 8514 Diag(Loc, diag::warn_attribute_weak_on_field); 8515 8516 NewFD->setAccess(AS); 8517 return NewFD; 8518} 8519 8520bool Sema::CheckNontrivialField(FieldDecl *FD) { 8521 assert(FD); 8522 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8523 8524 if (FD->isInvalidDecl()) 8525 return true; 8526 8527 QualType EltTy = Context.getBaseElementType(FD->getType()); 8528 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8529 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8530 if (RDecl->getDefinition()) { 8531 // We check for copy constructors before constructors 8532 // because otherwise we'll never get complaints about 8533 // copy constructors. 8534 8535 CXXSpecialMember member = CXXInvalid; 8536 if (!RDecl->hasTrivialCopyConstructor()) 8537 member = CXXCopyConstructor; 8538 else if (!RDecl->hasTrivialDefaultConstructor()) 8539 member = CXXDefaultConstructor; 8540 else if (!RDecl->hasTrivialCopyAssignment()) 8541 member = CXXCopyAssignment; 8542 else if (!RDecl->hasTrivialDestructor()) 8543 member = CXXDestructor; 8544 8545 if (member != CXXInvalid) { 8546 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8547 // Objective-C++ ARC: it is an error to have a non-trivial field of 8548 // a union. However, system headers in Objective-C programs 8549 // occasionally have Objective-C lifetime objects within unions, 8550 // and rather than cause the program to fail, we make those 8551 // members unavailable. 8552 SourceLocation Loc = FD->getLocation(); 8553 if (getSourceManager().isInSystemHeader(Loc)) { 8554 if (!FD->hasAttr<UnavailableAttr>()) 8555 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8556 "this system field has retaining ownership")); 8557 return false; 8558 } 8559 } 8560 8561 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8562 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8563 DiagnoseNontrivial(RT, member); 8564 return true; 8565 } 8566 } 8567 } 8568 8569 return false; 8570} 8571 8572/// DiagnoseNontrivial - Given that a class has a non-trivial 8573/// special member, figure out why. 8574void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8575 QualType QT(T, 0U); 8576 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8577 8578 // Check whether the member was user-declared. 8579 switch (member) { 8580 case CXXInvalid: 8581 break; 8582 8583 case CXXDefaultConstructor: 8584 if (RD->hasUserDeclaredConstructor()) { 8585 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8586 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8587 const FunctionDecl *body = 0; 8588 ci->hasBody(body); 8589 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8590 SourceLocation CtorLoc = ci->getLocation(); 8591 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8592 return; 8593 } 8594 } 8595 8596 llvm_unreachable("found no user-declared constructors"); 8597 } 8598 break; 8599 8600 case CXXCopyConstructor: 8601 if (RD->hasUserDeclaredCopyConstructor()) { 8602 SourceLocation CtorLoc = 8603 RD->getCopyConstructor(0)->getLocation(); 8604 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8605 return; 8606 } 8607 break; 8608 8609 case CXXMoveConstructor: 8610 if (RD->hasUserDeclaredMoveConstructor()) { 8611 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8612 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8613 return; 8614 } 8615 break; 8616 8617 case CXXCopyAssignment: 8618 if (RD->hasUserDeclaredCopyAssignment()) { 8619 // FIXME: this should use the location of the copy 8620 // assignment, not the type. 8621 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8622 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8623 return; 8624 } 8625 break; 8626 8627 case CXXMoveAssignment: 8628 if (RD->hasUserDeclaredMoveAssignment()) { 8629 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8630 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8631 return; 8632 } 8633 break; 8634 8635 case CXXDestructor: 8636 if (RD->hasUserDeclaredDestructor()) { 8637 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8638 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8639 return; 8640 } 8641 break; 8642 } 8643 8644 typedef CXXRecordDecl::base_class_iterator base_iter; 8645 8646 // Virtual bases and members inhibit trivial copying/construction, 8647 // but not trivial destruction. 8648 if (member != CXXDestructor) { 8649 // Check for virtual bases. vbases includes indirect virtual bases, 8650 // so we just iterate through the direct bases. 8651 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8652 if (bi->isVirtual()) { 8653 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8654 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8655 return; 8656 } 8657 8658 // Check for virtual methods. 8659 typedef CXXRecordDecl::method_iterator meth_iter; 8660 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8661 ++mi) { 8662 if (mi->isVirtual()) { 8663 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8664 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8665 return; 8666 } 8667 } 8668 } 8669 8670 bool (CXXRecordDecl::*hasTrivial)() const; 8671 switch (member) { 8672 case CXXDefaultConstructor: 8673 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8674 case CXXCopyConstructor: 8675 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8676 case CXXCopyAssignment: 8677 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8678 case CXXDestructor: 8679 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8680 default: 8681 llvm_unreachable("unexpected special member"); 8682 } 8683 8684 // Check for nontrivial bases (and recurse). 8685 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8686 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8687 assert(BaseRT && "Don't know how to handle dependent bases"); 8688 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8689 if (!(BaseRecTy->*hasTrivial)()) { 8690 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8691 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8692 DiagnoseNontrivial(BaseRT, member); 8693 return; 8694 } 8695 } 8696 8697 // Check for nontrivial members (and recurse). 8698 typedef RecordDecl::field_iterator field_iter; 8699 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8700 ++fi) { 8701 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8702 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8703 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8704 8705 if (!(EltRD->*hasTrivial)()) { 8706 SourceLocation FLoc = (*fi)->getLocation(); 8707 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8708 DiagnoseNontrivial(EltRT, member); 8709 return; 8710 } 8711 } 8712 8713 if (EltTy->isObjCLifetimeType()) { 8714 switch (EltTy.getObjCLifetime()) { 8715 case Qualifiers::OCL_None: 8716 case Qualifiers::OCL_ExplicitNone: 8717 break; 8718 8719 case Qualifiers::OCL_Autoreleasing: 8720 case Qualifiers::OCL_Weak: 8721 case Qualifiers::OCL_Strong: 8722 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8723 << QT << EltTy.getObjCLifetime(); 8724 return; 8725 } 8726 } 8727 } 8728 8729 llvm_unreachable("found no explanation for non-trivial member"); 8730} 8731 8732/// TranslateIvarVisibility - Translate visibility from a token ID to an 8733/// AST enum value. 8734static ObjCIvarDecl::AccessControl 8735TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8736 switch (ivarVisibility) { 8737 default: llvm_unreachable("Unknown visitibility kind"); 8738 case tok::objc_private: return ObjCIvarDecl::Private; 8739 case tok::objc_public: return ObjCIvarDecl::Public; 8740 case tok::objc_protected: return ObjCIvarDecl::Protected; 8741 case tok::objc_package: return ObjCIvarDecl::Package; 8742 } 8743} 8744 8745/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8746/// in order to create an IvarDecl object for it. 8747Decl *Sema::ActOnIvar(Scope *S, 8748 SourceLocation DeclStart, 8749 Declarator &D, Expr *BitfieldWidth, 8750 tok::ObjCKeywordKind Visibility) { 8751 8752 IdentifierInfo *II = D.getIdentifier(); 8753 Expr *BitWidth = (Expr*)BitfieldWidth; 8754 SourceLocation Loc = DeclStart; 8755 if (II) Loc = D.getIdentifierLoc(); 8756 8757 // FIXME: Unnamed fields can be handled in various different ways, for 8758 // example, unnamed unions inject all members into the struct namespace! 8759 8760 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8761 QualType T = TInfo->getType(); 8762 8763 if (BitWidth) { 8764 // 6.7.2.1p3, 6.7.2.1p4 8765 if (VerifyBitField(Loc, II, T, BitWidth)) { 8766 D.setInvalidType(); 8767 BitWidth = 0; 8768 } 8769 } else { 8770 // Not a bitfield. 8771 8772 // validate II. 8773 8774 } 8775 if (T->isReferenceType()) { 8776 Diag(Loc, diag::err_ivar_reference_type); 8777 D.setInvalidType(); 8778 } 8779 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8780 // than a variably modified type. 8781 else if (T->isVariablyModifiedType()) { 8782 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8783 D.setInvalidType(); 8784 } 8785 8786 // Get the visibility (access control) for this ivar. 8787 ObjCIvarDecl::AccessControl ac = 8788 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8789 : ObjCIvarDecl::None; 8790 // Must set ivar's DeclContext to its enclosing interface. 8791 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8792 ObjCContainerDecl *EnclosingContext; 8793 if (ObjCImplementationDecl *IMPDecl = 8794 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8795 if (!LangOpts.ObjCNonFragileABI2) { 8796 // Case of ivar declared in an implementation. Context is that of its class. 8797 EnclosingContext = IMPDecl->getClassInterface(); 8798 assert(EnclosingContext && "Implementation has no class interface!"); 8799 } 8800 else 8801 EnclosingContext = EnclosingDecl; 8802 } else { 8803 if (ObjCCategoryDecl *CDecl = 8804 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8805 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8806 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8807 return 0; 8808 } 8809 } 8810 EnclosingContext = EnclosingDecl; 8811 } 8812 8813 // Construct the decl. 8814 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8815 DeclStart, Loc, II, T, 8816 TInfo, ac, (Expr *)BitfieldWidth); 8817 8818 if (II) { 8819 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8820 ForRedeclaration); 8821 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8822 && !isa<TagDecl>(PrevDecl)) { 8823 Diag(Loc, diag::err_duplicate_member) << II; 8824 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8825 NewID->setInvalidDecl(); 8826 } 8827 } 8828 8829 // Process attributes attached to the ivar. 8830 ProcessDeclAttributes(S, NewID, D); 8831 8832 if (D.isInvalidType()) 8833 NewID->setInvalidDecl(); 8834 8835 // In ARC, infer 'retaining' for ivars of retainable type. 8836 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8837 NewID->setInvalidDecl(); 8838 8839 if (D.getDeclSpec().isModulePrivateSpecified()) 8840 NewID->setModulePrivate(); 8841 8842 if (II) { 8843 // FIXME: When interfaces are DeclContexts, we'll need to add 8844 // these to the interface. 8845 S->AddDecl(NewID); 8846 IdResolver.AddDecl(NewID); 8847 } 8848 8849 return NewID; 8850} 8851 8852/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8853/// class and class extensions. For every class @interface and class 8854/// extension @interface, if the last ivar is a bitfield of any type, 8855/// then add an implicit `char :0` ivar to the end of that interface. 8856void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8857 SmallVectorImpl<Decl *> &AllIvarDecls) { 8858 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8859 return; 8860 8861 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8862 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8863 8864 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8865 return; 8866 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8867 if (!ID) { 8868 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8869 if (!CD->IsClassExtension()) 8870 return; 8871 } 8872 // No need to add this to end of @implementation. 8873 else 8874 return; 8875 } 8876 // All conditions are met. Add a new bitfield to the tail end of ivars. 8877 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8878 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8879 8880 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8881 DeclLoc, DeclLoc, 0, 8882 Context.CharTy, 8883 Context.getTrivialTypeSourceInfo(Context.CharTy, 8884 DeclLoc), 8885 ObjCIvarDecl::Private, BW, 8886 true); 8887 AllIvarDecls.push_back(Ivar); 8888} 8889 8890void Sema::ActOnFields(Scope* S, 8891 SourceLocation RecLoc, Decl *EnclosingDecl, 8892 llvm::ArrayRef<Decl *> Fields, 8893 SourceLocation LBrac, SourceLocation RBrac, 8894 AttributeList *Attr) { 8895 assert(EnclosingDecl && "missing record or interface decl"); 8896 8897 // If the decl this is being inserted into is invalid, then it may be a 8898 // redeclaration or some other bogus case. Don't try to add fields to it. 8899 if (EnclosingDecl->isInvalidDecl()) 8900 return; 8901 8902 // Verify that all the fields are okay. 8903 unsigned NumNamedMembers = 0; 8904 SmallVector<FieldDecl*, 32> RecFields; 8905 8906 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8907 bool ARCErrReported = false; 8908 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8909 i != end; ++i) { 8910 FieldDecl *FD = cast<FieldDecl>(*i); 8911 8912 // Get the type for the field. 8913 const Type *FDTy = FD->getType().getTypePtr(); 8914 8915 if (!FD->isAnonymousStructOrUnion()) { 8916 // Remember all fields written by the user. 8917 RecFields.push_back(FD); 8918 } 8919 8920 // If the field is already invalid for some reason, don't emit more 8921 // diagnostics about it. 8922 if (FD->isInvalidDecl()) { 8923 EnclosingDecl->setInvalidDecl(); 8924 continue; 8925 } 8926 8927 // C99 6.7.2.1p2: 8928 // A structure or union shall not contain a member with 8929 // incomplete or function type (hence, a structure shall not 8930 // contain an instance of itself, but may contain a pointer to 8931 // an instance of itself), except that the last member of a 8932 // structure with more than one named member may have incomplete 8933 // array type; such a structure (and any union containing, 8934 // possibly recursively, a member that is such a structure) 8935 // shall not be a member of a structure or an element of an 8936 // array. 8937 if (FDTy->isFunctionType()) { 8938 // Field declared as a function. 8939 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8940 << FD->getDeclName(); 8941 FD->setInvalidDecl(); 8942 EnclosingDecl->setInvalidDecl(); 8943 continue; 8944 } else if (FDTy->isIncompleteArrayType() && Record && 8945 ((i + 1 == Fields.end() && !Record->isUnion()) || 8946 ((getLangOptions().MicrosoftExt || 8947 getLangOptions().CPlusPlus) && 8948 (i + 1 == Fields.end() || Record->isUnion())))) { 8949 // Flexible array member. 8950 // Microsoft and g++ is more permissive regarding flexible array. 8951 // It will accept flexible array in union and also 8952 // as the sole element of a struct/class. 8953 if (getLangOptions().MicrosoftExt) { 8954 if (Record->isUnion()) 8955 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8956 << FD->getDeclName(); 8957 else if (Fields.size() == 1) 8958 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8959 << FD->getDeclName() << Record->getTagKind(); 8960 } else if (getLangOptions().CPlusPlus) { 8961 if (Record->isUnion()) 8962 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8963 << FD->getDeclName(); 8964 else if (Fields.size() == 1) 8965 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8966 << FD->getDeclName() << Record->getTagKind(); 8967 } else if (NumNamedMembers < 1) { 8968 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8969 << FD->getDeclName(); 8970 FD->setInvalidDecl(); 8971 EnclosingDecl->setInvalidDecl(); 8972 continue; 8973 } 8974 if (!FD->getType()->isDependentType() && 8975 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8976 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8977 << FD->getDeclName() << FD->getType(); 8978 FD->setInvalidDecl(); 8979 EnclosingDecl->setInvalidDecl(); 8980 continue; 8981 } 8982 // Okay, we have a legal flexible array member at the end of the struct. 8983 if (Record) 8984 Record->setHasFlexibleArrayMember(true); 8985 } else if (!FDTy->isDependentType() && 8986 RequireCompleteType(FD->getLocation(), FD->getType(), 8987 diag::err_field_incomplete)) { 8988 // Incomplete type 8989 FD->setInvalidDecl(); 8990 EnclosingDecl->setInvalidDecl(); 8991 continue; 8992 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8993 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8994 // If this is a member of a union, then entire union becomes "flexible". 8995 if (Record && Record->isUnion()) { 8996 Record->setHasFlexibleArrayMember(true); 8997 } else { 8998 // If this is a struct/class and this is not the last element, reject 8999 // it. Note that GCC supports variable sized arrays in the middle of 9000 // structures. 9001 if (i + 1 != Fields.end()) 9002 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9003 << FD->getDeclName() << FD->getType(); 9004 else { 9005 // We support flexible arrays at the end of structs in 9006 // other structs as an extension. 9007 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9008 << FD->getDeclName(); 9009 if (Record) 9010 Record->setHasFlexibleArrayMember(true); 9011 } 9012 } 9013 } 9014 if (Record && FDTTy->getDecl()->hasObjectMember()) 9015 Record->setHasObjectMember(true); 9016 } else if (FDTy->isObjCObjectType()) { 9017 /// A field cannot be an Objective-c object 9018 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9019 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9020 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9021 FD->setType(T); 9022 } 9023 else if (!getLangOptions().CPlusPlus) { 9024 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9025 // It's an error in ARC if a field has lifetime. 9026 // We don't want to report this in a system header, though, 9027 // so we just make the field unavailable. 9028 // FIXME: that's really not sufficient; we need to make the type 9029 // itself invalid to, say, initialize or copy. 9030 QualType T = FD->getType(); 9031 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9032 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9033 SourceLocation loc = FD->getLocation(); 9034 if (getSourceManager().isInSystemHeader(loc)) { 9035 if (!FD->hasAttr<UnavailableAttr>()) { 9036 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9037 "this system field has retaining ownership")); 9038 } 9039 } else { 9040 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9041 } 9042 ARCErrReported = true; 9043 } 9044 } 9045 else if (getLangOptions().ObjC1 && 9046 getLangOptions().getGC() != LangOptions::NonGC && 9047 Record && !Record->hasObjectMember()) { 9048 if (FD->getType()->isObjCObjectPointerType() || 9049 FD->getType().isObjCGCStrong()) 9050 Record->setHasObjectMember(true); 9051 else if (Context.getAsArrayType(FD->getType())) { 9052 QualType BaseType = Context.getBaseElementType(FD->getType()); 9053 if (BaseType->isRecordType() && 9054 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9055 Record->setHasObjectMember(true); 9056 else if (BaseType->isObjCObjectPointerType() || 9057 BaseType.isObjCGCStrong()) 9058 Record->setHasObjectMember(true); 9059 } 9060 } 9061 } 9062 // Keep track of the number of named members. 9063 if (FD->getIdentifier()) 9064 ++NumNamedMembers; 9065 } 9066 9067 // Okay, we successfully defined 'Record'. 9068 if (Record) { 9069 bool Completed = false; 9070 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9071 if (!CXXRecord->isInvalidDecl()) { 9072 // Set access bits correctly on the directly-declared conversions. 9073 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9074 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9075 I != E; ++I) 9076 Convs->setAccess(I, (*I)->getAccess()); 9077 9078 if (!CXXRecord->isDependentType()) { 9079 // Objective-C Automatic Reference Counting: 9080 // If a class has a non-static data member of Objective-C pointer 9081 // type (or array thereof), it is a non-POD type and its 9082 // default constructor (if any), copy constructor, copy assignment 9083 // operator, and destructor are non-trivial. 9084 // 9085 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9086 // However, here we check whether this particular class is only 9087 // non-POD because of the presence of an Objective-C pointer member. 9088 // If so, objects of this type cannot be shared between code compiled 9089 // with instant objects and code compiled with manual retain/release. 9090 if (getLangOptions().ObjCAutoRefCount && 9091 CXXRecord->hasObjectMember() && 9092 CXXRecord->getLinkage() == ExternalLinkage) { 9093 if (CXXRecord->isPOD()) { 9094 Diag(CXXRecord->getLocation(), 9095 diag::warn_arc_non_pod_class_with_object_member) 9096 << CXXRecord; 9097 } else { 9098 // FIXME: Fix-Its would be nice here, but finding a good location 9099 // for them is going to be tricky. 9100 if (CXXRecord->hasTrivialCopyConstructor()) 9101 Diag(CXXRecord->getLocation(), 9102 diag::warn_arc_trivial_member_function_with_object_member) 9103 << CXXRecord << 0; 9104 if (CXXRecord->hasTrivialCopyAssignment()) 9105 Diag(CXXRecord->getLocation(), 9106 diag::warn_arc_trivial_member_function_with_object_member) 9107 << CXXRecord << 1; 9108 if (CXXRecord->hasTrivialDestructor()) 9109 Diag(CXXRecord->getLocation(), 9110 diag::warn_arc_trivial_member_function_with_object_member) 9111 << CXXRecord << 2; 9112 } 9113 } 9114 9115 // Adjust user-defined destructor exception spec. 9116 if (getLangOptions().CPlusPlus0x && 9117 CXXRecord->hasUserDeclaredDestructor()) 9118 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9119 9120 // Add any implicitly-declared members to this class. 9121 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9122 9123 // If we have virtual base classes, we may end up finding multiple 9124 // final overriders for a given virtual function. Check for this 9125 // problem now. 9126 if (CXXRecord->getNumVBases()) { 9127 CXXFinalOverriderMap FinalOverriders; 9128 CXXRecord->getFinalOverriders(FinalOverriders); 9129 9130 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9131 MEnd = FinalOverriders.end(); 9132 M != MEnd; ++M) { 9133 for (OverridingMethods::iterator SO = M->second.begin(), 9134 SOEnd = M->second.end(); 9135 SO != SOEnd; ++SO) { 9136 assert(SO->second.size() > 0 && 9137 "Virtual function without overridding functions?"); 9138 if (SO->second.size() == 1) 9139 continue; 9140 9141 // C++ [class.virtual]p2: 9142 // In a derived class, if a virtual member function of a base 9143 // class subobject has more than one final overrider the 9144 // program is ill-formed. 9145 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9146 << (NamedDecl *)M->first << Record; 9147 Diag(M->first->getLocation(), 9148 diag::note_overridden_virtual_function); 9149 for (OverridingMethods::overriding_iterator 9150 OM = SO->second.begin(), 9151 OMEnd = SO->second.end(); 9152 OM != OMEnd; ++OM) 9153 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9154 << (NamedDecl *)M->first << OM->Method->getParent(); 9155 9156 Record->setInvalidDecl(); 9157 } 9158 } 9159 CXXRecord->completeDefinition(&FinalOverriders); 9160 Completed = true; 9161 } 9162 } 9163 } 9164 } 9165 9166 if (!Completed) 9167 Record->completeDefinition(); 9168 9169 // Now that the record is complete, do any delayed exception spec checks 9170 // we were missing. 9171 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9172 const CXXDestructorDecl *Dtor = 9173 DelayedDestructorExceptionSpecChecks.back().first; 9174 if (Dtor->getParent() != Record) 9175 break; 9176 9177 assert(!Dtor->getParent()->isDependentType() && 9178 "Should not ever add destructors of templates into the list."); 9179 CheckOverridingFunctionExceptionSpec(Dtor, 9180 DelayedDestructorExceptionSpecChecks.back().second); 9181 DelayedDestructorExceptionSpecChecks.pop_back(); 9182 } 9183 9184 } else { 9185 ObjCIvarDecl **ClsFields = 9186 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9187 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9188 ID->setLocEnd(RBrac); 9189 // Add ivar's to class's DeclContext. 9190 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9191 ClsFields[i]->setLexicalDeclContext(ID); 9192 ID->addDecl(ClsFields[i]); 9193 } 9194 // Must enforce the rule that ivars in the base classes may not be 9195 // duplicates. 9196 if (ID->getSuperClass()) 9197 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9198 } else if (ObjCImplementationDecl *IMPDecl = 9199 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9200 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9201 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9202 // Ivar declared in @implementation never belongs to the implementation. 9203 // Only it is in implementation's lexical context. 9204 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9205 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9206 } else if (ObjCCategoryDecl *CDecl = 9207 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9208 // case of ivars in class extension; all other cases have been 9209 // reported as errors elsewhere. 9210 // FIXME. Class extension does not have a LocEnd field. 9211 // CDecl->setLocEnd(RBrac); 9212 // Add ivar's to class extension's DeclContext. 9213 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9214 ClsFields[i]->setLexicalDeclContext(CDecl); 9215 CDecl->addDecl(ClsFields[i]); 9216 } 9217 } 9218 } 9219 9220 if (Attr) 9221 ProcessDeclAttributeList(S, Record, Attr); 9222 9223 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9224 // set the visibility of this record. 9225 if (Record && !Record->getDeclContext()->isRecord()) 9226 AddPushedVisibilityAttribute(Record); 9227} 9228 9229/// \brief Determine whether the given integral value is representable within 9230/// the given type T. 9231static bool isRepresentableIntegerValue(ASTContext &Context, 9232 llvm::APSInt &Value, 9233 QualType T) { 9234 assert(T->isIntegralType(Context) && "Integral type required!"); 9235 unsigned BitWidth = Context.getIntWidth(T); 9236 9237 if (Value.isUnsigned() || Value.isNonNegative()) { 9238 if (T->isSignedIntegerOrEnumerationType()) 9239 --BitWidth; 9240 return Value.getActiveBits() <= BitWidth; 9241 } 9242 return Value.getMinSignedBits() <= BitWidth; 9243} 9244 9245// \brief Given an integral type, return the next larger integral type 9246// (or a NULL type of no such type exists). 9247static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9248 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9249 // enum checking below. 9250 assert(T->isIntegralType(Context) && "Integral type required!"); 9251 const unsigned NumTypes = 4; 9252 QualType SignedIntegralTypes[NumTypes] = { 9253 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9254 }; 9255 QualType UnsignedIntegralTypes[NumTypes] = { 9256 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9257 Context.UnsignedLongLongTy 9258 }; 9259 9260 unsigned BitWidth = Context.getTypeSize(T); 9261 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9262 : UnsignedIntegralTypes; 9263 for (unsigned I = 0; I != NumTypes; ++I) 9264 if (Context.getTypeSize(Types[I]) > BitWidth) 9265 return Types[I]; 9266 9267 return QualType(); 9268} 9269 9270EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9271 EnumConstantDecl *LastEnumConst, 9272 SourceLocation IdLoc, 9273 IdentifierInfo *Id, 9274 Expr *Val) { 9275 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9276 llvm::APSInt EnumVal(IntWidth); 9277 QualType EltTy; 9278 9279 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9280 Val = 0; 9281 9282 if (Val) { 9283 if (Enum->isDependentType() || Val->isTypeDependent()) 9284 EltTy = Context.DependentTy; 9285 else { 9286 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9287 SourceLocation ExpLoc; 9288 if (!Val->isValueDependent() && 9289 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9290 Val = 0; 9291 } else { 9292 if (!getLangOptions().CPlusPlus) { 9293 // C99 6.7.2.2p2: 9294 // The expression that defines the value of an enumeration constant 9295 // shall be an integer constant expression that has a value 9296 // representable as an int. 9297 9298 // Complain if the value is not representable in an int. 9299 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9300 Diag(IdLoc, diag::ext_enum_value_not_int) 9301 << EnumVal.toString(10) << Val->getSourceRange() 9302 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9303 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9304 // Force the type of the expression to 'int'. 9305 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9306 } 9307 } 9308 9309 if (Enum->isFixed()) { 9310 EltTy = Enum->getIntegerType(); 9311 9312 // C++0x [dcl.enum]p5: 9313 // ... if the initializing value of an enumerator cannot be 9314 // represented by the underlying type, the program is ill-formed. 9315 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9316 if (getLangOptions().MicrosoftExt) { 9317 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9318 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9319 } else 9320 Diag(IdLoc, diag::err_enumerator_too_large) 9321 << EltTy; 9322 } else 9323 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9324 } 9325 else { 9326 // C++0x [dcl.enum]p5: 9327 // If the underlying type is not fixed, the type of each enumerator 9328 // is the type of its initializing value: 9329 // - If an initializer is specified for an enumerator, the 9330 // initializing value has the same type as the expression. 9331 EltTy = Val->getType(); 9332 } 9333 } 9334 } 9335 } 9336 9337 if (!Val) { 9338 if (Enum->isDependentType()) 9339 EltTy = Context.DependentTy; 9340 else if (!LastEnumConst) { 9341 // C++0x [dcl.enum]p5: 9342 // If the underlying type is not fixed, the type of each enumerator 9343 // is the type of its initializing value: 9344 // - If no initializer is specified for the first enumerator, the 9345 // initializing value has an unspecified integral type. 9346 // 9347 // GCC uses 'int' for its unspecified integral type, as does 9348 // C99 6.7.2.2p3. 9349 if (Enum->isFixed()) { 9350 EltTy = Enum->getIntegerType(); 9351 } 9352 else { 9353 EltTy = Context.IntTy; 9354 } 9355 } else { 9356 // Assign the last value + 1. 9357 EnumVal = LastEnumConst->getInitVal(); 9358 ++EnumVal; 9359 EltTy = LastEnumConst->getType(); 9360 9361 // Check for overflow on increment. 9362 if (EnumVal < LastEnumConst->getInitVal()) { 9363 // C++0x [dcl.enum]p5: 9364 // If the underlying type is not fixed, the type of each enumerator 9365 // is the type of its initializing value: 9366 // 9367 // - Otherwise the type of the initializing value is the same as 9368 // the type of the initializing value of the preceding enumerator 9369 // unless the incremented value is not representable in that type, 9370 // in which case the type is an unspecified integral type 9371 // sufficient to contain the incremented value. If no such type 9372 // exists, the program is ill-formed. 9373 QualType T = getNextLargerIntegralType(Context, EltTy); 9374 if (T.isNull() || Enum->isFixed()) { 9375 // There is no integral type larger enough to represent this 9376 // value. Complain, then allow the value to wrap around. 9377 EnumVal = LastEnumConst->getInitVal(); 9378 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9379 ++EnumVal; 9380 if (Enum->isFixed()) 9381 // When the underlying type is fixed, this is ill-formed. 9382 Diag(IdLoc, diag::err_enumerator_wrapped) 9383 << EnumVal.toString(10) 9384 << EltTy; 9385 else 9386 Diag(IdLoc, diag::warn_enumerator_too_large) 9387 << EnumVal.toString(10); 9388 } else { 9389 EltTy = T; 9390 } 9391 9392 // Retrieve the last enumerator's value, extent that type to the 9393 // type that is supposed to be large enough to represent the incremented 9394 // value, then increment. 9395 EnumVal = LastEnumConst->getInitVal(); 9396 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9397 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9398 ++EnumVal; 9399 9400 // If we're not in C++, diagnose the overflow of enumerator values, 9401 // which in C99 means that the enumerator value is not representable in 9402 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9403 // permits enumerator values that are representable in some larger 9404 // integral type. 9405 if (!getLangOptions().CPlusPlus && !T.isNull()) 9406 Diag(IdLoc, diag::warn_enum_value_overflow); 9407 } else if (!getLangOptions().CPlusPlus && 9408 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9409 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9410 Diag(IdLoc, diag::ext_enum_value_not_int) 9411 << EnumVal.toString(10) << 1; 9412 } 9413 } 9414 } 9415 9416 if (!EltTy->isDependentType()) { 9417 // Make the enumerator value match the signedness and size of the 9418 // enumerator's type. 9419 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9420 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9421 } 9422 9423 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9424 Val, EnumVal); 9425} 9426 9427 9428Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9429 SourceLocation IdLoc, IdentifierInfo *Id, 9430 AttributeList *Attr, 9431 SourceLocation EqualLoc, Expr *val) { 9432 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9433 EnumConstantDecl *LastEnumConst = 9434 cast_or_null<EnumConstantDecl>(lastEnumConst); 9435 Expr *Val = static_cast<Expr*>(val); 9436 9437 // The scope passed in may not be a decl scope. Zip up the scope tree until 9438 // we find one that is. 9439 S = getNonFieldDeclScope(S); 9440 9441 // Verify that there isn't already something declared with this name in this 9442 // scope. 9443 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9444 ForRedeclaration); 9445 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9446 // Maybe we will complain about the shadowed template parameter. 9447 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9448 // Just pretend that we didn't see the previous declaration. 9449 PrevDecl = 0; 9450 } 9451 9452 if (PrevDecl) { 9453 // When in C++, we may get a TagDecl with the same name; in this case the 9454 // enum constant will 'hide' the tag. 9455 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9456 "Received TagDecl when not in C++!"); 9457 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9458 if (isa<EnumConstantDecl>(PrevDecl)) 9459 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9460 else 9461 Diag(IdLoc, diag::err_redefinition) << Id; 9462 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9463 return 0; 9464 } 9465 } 9466 9467 // C++ [class.mem]p13: 9468 // If T is the name of a class, then each of the following shall have a 9469 // name different from T: 9470 // - every enumerator of every member of class T that is an enumerated 9471 // type 9472 if (CXXRecordDecl *Record 9473 = dyn_cast<CXXRecordDecl>( 9474 TheEnumDecl->getDeclContext()->getRedeclContext())) 9475 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9476 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9477 9478 EnumConstantDecl *New = 9479 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9480 9481 if (New) { 9482 // Process attributes. 9483 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9484 9485 // Register this decl in the current scope stack. 9486 New->setAccess(TheEnumDecl->getAccess()); 9487 PushOnScopeChains(New, S); 9488 } 9489 9490 return New; 9491} 9492 9493void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9494 SourceLocation RBraceLoc, Decl *EnumDeclX, 9495 Decl **Elements, unsigned NumElements, 9496 Scope *S, AttributeList *Attr) { 9497 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9498 QualType EnumType = Context.getTypeDeclType(Enum); 9499 9500 if (Attr) 9501 ProcessDeclAttributeList(S, Enum, Attr); 9502 9503 if (Enum->isDependentType()) { 9504 for (unsigned i = 0; i != NumElements; ++i) { 9505 EnumConstantDecl *ECD = 9506 cast_or_null<EnumConstantDecl>(Elements[i]); 9507 if (!ECD) continue; 9508 9509 ECD->setType(EnumType); 9510 } 9511 9512 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9513 return; 9514 } 9515 9516 // TODO: If the result value doesn't fit in an int, it must be a long or long 9517 // long value. ISO C does not support this, but GCC does as an extension, 9518 // emit a warning. 9519 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9520 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9521 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9522 9523 // Verify that all the values are okay, compute the size of the values, and 9524 // reverse the list. 9525 unsigned NumNegativeBits = 0; 9526 unsigned NumPositiveBits = 0; 9527 9528 // Keep track of whether all elements have type int. 9529 bool AllElementsInt = true; 9530 9531 for (unsigned i = 0; i != NumElements; ++i) { 9532 EnumConstantDecl *ECD = 9533 cast_or_null<EnumConstantDecl>(Elements[i]); 9534 if (!ECD) continue; // Already issued a diagnostic. 9535 9536 const llvm::APSInt &InitVal = ECD->getInitVal(); 9537 9538 // Keep track of the size of positive and negative values. 9539 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9540 NumPositiveBits = std::max(NumPositiveBits, 9541 (unsigned)InitVal.getActiveBits()); 9542 else 9543 NumNegativeBits = std::max(NumNegativeBits, 9544 (unsigned)InitVal.getMinSignedBits()); 9545 9546 // Keep track of whether every enum element has type int (very commmon). 9547 if (AllElementsInt) 9548 AllElementsInt = ECD->getType() == Context.IntTy; 9549 } 9550 9551 // Figure out the type that should be used for this enum. 9552 QualType BestType; 9553 unsigned BestWidth; 9554 9555 // C++0x N3000 [conv.prom]p3: 9556 // An rvalue of an unscoped enumeration type whose underlying 9557 // type is not fixed can be converted to an rvalue of the first 9558 // of the following types that can represent all the values of 9559 // the enumeration: int, unsigned int, long int, unsigned long 9560 // int, long long int, or unsigned long long int. 9561 // C99 6.4.4.3p2: 9562 // An identifier declared as an enumeration constant has type int. 9563 // The C99 rule is modified by a gcc extension 9564 QualType BestPromotionType; 9565 9566 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9567 // -fshort-enums is the equivalent to specifying the packed attribute on all 9568 // enum definitions. 9569 if (LangOpts.ShortEnums) 9570 Packed = true; 9571 9572 if (Enum->isFixed()) { 9573 BestType = BestPromotionType = Enum->getIntegerType(); 9574 // We don't need to set BestWidth, because BestType is going to be the type 9575 // of the enumerators, but we do anyway because otherwise some compilers 9576 // warn that it might be used uninitialized. 9577 BestWidth = CharWidth; 9578 } 9579 else if (NumNegativeBits) { 9580 // If there is a negative value, figure out the smallest integer type (of 9581 // int/long/longlong) that fits. 9582 // If it's packed, check also if it fits a char or a short. 9583 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9584 BestType = Context.SignedCharTy; 9585 BestWidth = CharWidth; 9586 } else if (Packed && NumNegativeBits <= ShortWidth && 9587 NumPositiveBits < ShortWidth) { 9588 BestType = Context.ShortTy; 9589 BestWidth = ShortWidth; 9590 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9591 BestType = Context.IntTy; 9592 BestWidth = IntWidth; 9593 } else { 9594 BestWidth = Context.getTargetInfo().getLongWidth(); 9595 9596 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9597 BestType = Context.LongTy; 9598 } else { 9599 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9600 9601 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9602 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9603 BestType = Context.LongLongTy; 9604 } 9605 } 9606 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9607 } else { 9608 // If there is no negative value, figure out the smallest type that fits 9609 // all of the enumerator values. 9610 // If it's packed, check also if it fits a char or a short. 9611 if (Packed && NumPositiveBits <= CharWidth) { 9612 BestType = Context.UnsignedCharTy; 9613 BestPromotionType = Context.IntTy; 9614 BestWidth = CharWidth; 9615 } else if (Packed && NumPositiveBits <= ShortWidth) { 9616 BestType = Context.UnsignedShortTy; 9617 BestPromotionType = Context.IntTy; 9618 BestWidth = ShortWidth; 9619 } else if (NumPositiveBits <= IntWidth) { 9620 BestType = Context.UnsignedIntTy; 9621 BestWidth = IntWidth; 9622 BestPromotionType 9623 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9624 ? Context.UnsignedIntTy : Context.IntTy; 9625 } else if (NumPositiveBits <= 9626 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9627 BestType = Context.UnsignedLongTy; 9628 BestPromotionType 9629 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9630 ? Context.UnsignedLongTy : Context.LongTy; 9631 } else { 9632 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9633 assert(NumPositiveBits <= BestWidth && 9634 "How could an initializer get larger than ULL?"); 9635 BestType = Context.UnsignedLongLongTy; 9636 BestPromotionType 9637 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9638 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9639 } 9640 } 9641 9642 // Loop over all of the enumerator constants, changing their types to match 9643 // the type of the enum if needed. 9644 for (unsigned i = 0; i != NumElements; ++i) { 9645 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9646 if (!ECD) continue; // Already issued a diagnostic. 9647 9648 // Standard C says the enumerators have int type, but we allow, as an 9649 // extension, the enumerators to be larger than int size. If each 9650 // enumerator value fits in an int, type it as an int, otherwise type it the 9651 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9652 // that X has type 'int', not 'unsigned'. 9653 9654 // Determine whether the value fits into an int. 9655 llvm::APSInt InitVal = ECD->getInitVal(); 9656 9657 // If it fits into an integer type, force it. Otherwise force it to match 9658 // the enum decl type. 9659 QualType NewTy; 9660 unsigned NewWidth; 9661 bool NewSign; 9662 if (!getLangOptions().CPlusPlus && 9663 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9664 NewTy = Context.IntTy; 9665 NewWidth = IntWidth; 9666 NewSign = true; 9667 } else if (ECD->getType() == BestType) { 9668 // Already the right type! 9669 if (getLangOptions().CPlusPlus) 9670 // C++ [dcl.enum]p4: Following the closing brace of an 9671 // enum-specifier, each enumerator has the type of its 9672 // enumeration. 9673 ECD->setType(EnumType); 9674 continue; 9675 } else { 9676 NewTy = BestType; 9677 NewWidth = BestWidth; 9678 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9679 } 9680 9681 // Adjust the APSInt value. 9682 InitVal = InitVal.extOrTrunc(NewWidth); 9683 InitVal.setIsSigned(NewSign); 9684 ECD->setInitVal(InitVal); 9685 9686 // Adjust the Expr initializer and type. 9687 if (ECD->getInitExpr() && 9688 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9689 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9690 CK_IntegralCast, 9691 ECD->getInitExpr(), 9692 /*base paths*/ 0, 9693 VK_RValue)); 9694 if (getLangOptions().CPlusPlus) 9695 // C++ [dcl.enum]p4: Following the closing brace of an 9696 // enum-specifier, each enumerator has the type of its 9697 // enumeration. 9698 ECD->setType(EnumType); 9699 else 9700 ECD->setType(NewTy); 9701 } 9702 9703 Enum->completeDefinition(BestType, BestPromotionType, 9704 NumPositiveBits, NumNegativeBits); 9705} 9706 9707Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9708 SourceLocation StartLoc, 9709 SourceLocation EndLoc) { 9710 StringLiteral *AsmString = cast<StringLiteral>(expr); 9711 9712 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9713 AsmString, StartLoc, 9714 EndLoc); 9715 CurContext->addDecl(New); 9716 return New; 9717} 9718 9719DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9720 IdentifierInfo &ModuleName, 9721 SourceLocation ModuleNameLoc) { 9722 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9723 ModuleName, ModuleNameLoc); 9724 if (!Module) 9725 return true; 9726 9727 // FIXME: Actually create a declaration to describe the module import. 9728 (void)Module; 9729 return DeclResult((Decl *)0); 9730} 9731 9732void 9733Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9734 SourceLocation ModulePrivateKeyword) { 9735 assert(!Old->isModulePrivate() && "Old is module-private!"); 9736 9737 Diag(New->getLocation(), diag::err_module_private_follows_public) 9738 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9739 Diag(Old->getLocation(), diag::note_previous_declaration) 9740 << Old->getDeclName(); 9741 9742 // Drop the __module_private__ from the new declaration, since it's invalid. 9743 New->setModulePrivate(false); 9744} 9745 9746void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9747 SourceLocation PragmaLoc, 9748 SourceLocation NameLoc) { 9749 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9750 9751 if (PrevDecl) { 9752 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9753 } else { 9754 (void)WeakUndeclaredIdentifiers.insert( 9755 std::pair<IdentifierInfo*,WeakInfo> 9756 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9757 } 9758} 9759 9760void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9761 IdentifierInfo* AliasName, 9762 SourceLocation PragmaLoc, 9763 SourceLocation NameLoc, 9764 SourceLocation AliasNameLoc) { 9765 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9766 LookupOrdinaryName); 9767 WeakInfo W = WeakInfo(Name, NameLoc); 9768 9769 if (PrevDecl) { 9770 if (!PrevDecl->hasAttr<AliasAttr>()) 9771 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9772 DeclApplyPragmaWeak(TUScope, ND, W); 9773 } else { 9774 (void)WeakUndeclaredIdentifiers.insert( 9775 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9776 } 9777} 9778 9779Decl *Sema::getObjCDeclContext() const { 9780 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9781} 9782 9783AvailabilityResult Sema::getCurContextAvailability() const { 9784 const Decl *D = cast<Decl>(getCurLexicalContext()); 9785 // A category implicitly has the availability of the interface. 9786 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9787 D = CatD->getClassInterface(); 9788 9789 return D->getAvailability(); 9790} 9791