SemaDecl.cpp revision d662a79f32b1c17dbb5aafcf5f939ca57360d7aa
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 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 421 .get(); 422 } else { 423 assert(SS && SS->isInvalid() && 424 "Invalid scope specifier has already been diagnosed"); 425 } 426 427 return true; 428} 429 430/// \brief Determine whether the given result set contains either a type name 431/// or 432static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 433 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 434 NextToken.is(tok::less); 435 436 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 437 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 438 return true; 439 440 if (CheckTemplate && isa<TemplateDecl>(*I)) 441 return true; 442 } 443 444 return false; 445} 446 447Sema::NameClassification Sema::ClassifyName(Scope *S, 448 CXXScopeSpec &SS, 449 IdentifierInfo *&Name, 450 SourceLocation NameLoc, 451 const Token &NextToken) { 452 DeclarationNameInfo NameInfo(Name, NameLoc); 453 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 454 455 if (NextToken.is(tok::coloncolon)) { 456 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 457 QualType(), false, SS, 0, false); 458 459 } 460 461 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 462 LookupParsedName(Result, S, &SS, !CurMethod); 463 464 // Perform lookup for Objective-C instance variables (including automatically 465 // synthesized instance variables), if we're in an Objective-C method. 466 // FIXME: This lookup really, really needs to be folded in to the normal 467 // unqualified lookup mechanism. 468 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 469 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 470 if (E.get() || E.isInvalid()) 471 return E; 472 } 473 474 bool SecondTry = false; 475 bool IsFilteredTemplateName = false; 476 477Corrected: 478 switch (Result.getResultKind()) { 479 case LookupResult::NotFound: 480 // If an unqualified-id is followed by a '(', then we have a function 481 // call. 482 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 483 // In C++, this is an ADL-only call. 484 // FIXME: Reference? 485 if (getLangOptions().CPlusPlus) 486 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 487 488 // C90 6.3.2.2: 489 // If the expression that precedes the parenthesized argument list in a 490 // function call consists solely of an identifier, and if no 491 // declaration is visible for this identifier, the identifier is 492 // implicitly declared exactly as if, in the innermost block containing 493 // the function call, the declaration 494 // 495 // extern int identifier (); 496 // 497 // appeared. 498 // 499 // We also allow this in C99 as an extension. 500 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 501 Result.addDecl(D); 502 Result.resolveKind(); 503 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 504 } 505 } 506 507 // In C, we first see whether there is a tag type by the same name, in 508 // which case it's likely that the user just forget to write "enum", 509 // "struct", or "union". 510 if (!getLangOptions().CPlusPlus && !SecondTry) { 511 Result.clear(LookupTagName); 512 LookupParsedName(Result, S, &SS); 513 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 514 const char *TagName = 0; 515 const char *FixItTagName = 0; 516 switch (Tag->getTagKind()) { 517 case TTK_Class: 518 TagName = "class"; 519 FixItTagName = "class "; 520 break; 521 522 case TTK_Enum: 523 TagName = "enum"; 524 FixItTagName = "enum "; 525 break; 526 527 case TTK_Struct: 528 TagName = "struct"; 529 FixItTagName = "struct "; 530 break; 531 532 case TTK_Union: 533 TagName = "union"; 534 FixItTagName = "union "; 535 break; 536 } 537 538 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 539 << Name << TagName << getLangOptions().CPlusPlus 540 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 541 break; 542 } 543 544 Result.clear(LookupOrdinaryName); 545 } 546 547 // Perform typo correction to determine if there is another name that is 548 // close to this name. 549 if (!SecondTry) { 550 SecondTry = true; 551 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 552 Result.getLookupKind(), S, 553 &SS)) { 554 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 555 unsigned QualifiedDiag = diag::err_no_member_suggest; 556 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 557 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 558 559 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 560 NamedDecl *UnderlyingFirstDecl 561 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 562 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 563 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 564 UnqualifiedDiag = diag::err_no_template_suggest; 565 QualifiedDiag = diag::err_no_member_template_suggest; 566 } else if (UnderlyingFirstDecl && 567 (isa<TypeDecl>(UnderlyingFirstDecl) || 568 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 569 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 570 UnqualifiedDiag = diag::err_unknown_typename_suggest; 571 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 572 } 573 574 if (SS.isEmpty()) 575 Diag(NameLoc, UnqualifiedDiag) 576 << Name << CorrectedQuotedStr 577 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 578 else 579 Diag(NameLoc, QualifiedDiag) 580 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 581 << SS.getRange() 582 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 583 584 // Update the name, so that the caller has the new name. 585 Name = Corrected.getCorrectionAsIdentifierInfo(); 586 587 // Also update the LookupResult... 588 // FIXME: This should probably go away at some point 589 Result.clear(); 590 Result.setLookupName(Corrected.getCorrection()); 591 if (FirstDecl) Result.addDecl(FirstDecl); 592 593 // Typo correction corrected to a keyword. 594 if (Corrected.isKeyword()) 595 return Corrected.getCorrectionAsIdentifierInfo(); 596 597 if (FirstDecl) 598 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 599 << CorrectedQuotedStr; 600 601 // If we found an Objective-C instance variable, let 602 // LookupInObjCMethod build the appropriate expression to 603 // reference the ivar. 604 // FIXME: This is a gross hack. 605 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 606 Result.clear(); 607 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 608 return move(E); 609 } 610 611 goto Corrected; 612 } 613 } 614 615 // We failed to correct; just fall through and let the parser deal with it. 616 Result.suppressDiagnostics(); 617 return NameClassification::Unknown(); 618 619 case LookupResult::NotFoundInCurrentInstantiation: 620 // We performed name lookup into the current instantiation, and there were 621 // dependent bases, so we treat this result the same way as any other 622 // dependent nested-name-specifier. 623 624 // C++ [temp.res]p2: 625 // A name used in a template declaration or definition and that is 626 // dependent on a template-parameter is assumed not to name a type 627 // unless the applicable name lookup finds a type name or the name is 628 // qualified by the keyword typename. 629 // 630 // FIXME: If the next token is '<', we might want to ask the parser to 631 // perform some heroics to see if we actually have a 632 // template-argument-list, which would indicate a missing 'template' 633 // keyword here. 634 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 635 636 case LookupResult::Found: 637 case LookupResult::FoundOverloaded: 638 case LookupResult::FoundUnresolvedValue: 639 break; 640 641 case LookupResult::Ambiguous: 642 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 643 hasAnyAcceptableTemplateNames(Result)) { 644 // C++ [temp.local]p3: 645 // A lookup that finds an injected-class-name (10.2) can result in an 646 // ambiguity in certain cases (for example, if it is found in more than 647 // one base class). If all of the injected-class-names that are found 648 // refer to specializations of the same class template, and if the name 649 // is followed by a template-argument-list, the reference refers to the 650 // class template itself and not a specialization thereof, and is not 651 // ambiguous. 652 // 653 // This filtering can make an ambiguous result into an unambiguous one, 654 // so try again after filtering out template names. 655 FilterAcceptableTemplateNames(Result); 656 if (!Result.isAmbiguous()) { 657 IsFilteredTemplateName = true; 658 break; 659 } 660 } 661 662 // Diagnose the ambiguity and return an error. 663 return NameClassification::Error(); 664 } 665 666 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 667 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 668 // C++ [temp.names]p3: 669 // After name lookup (3.4) finds that a name is a template-name or that 670 // an operator-function-id or a literal- operator-id refers to a set of 671 // overloaded functions any member of which is a function template if 672 // this is followed by a <, the < is always taken as the delimiter of a 673 // template-argument-list and never as the less-than operator. 674 if (!IsFilteredTemplateName) 675 FilterAcceptableTemplateNames(Result); 676 677 if (!Result.empty()) { 678 bool IsFunctionTemplate; 679 TemplateName Template; 680 if (Result.end() - Result.begin() > 1) { 681 IsFunctionTemplate = true; 682 Template = Context.getOverloadedTemplateName(Result.begin(), 683 Result.end()); 684 } else { 685 TemplateDecl *TD 686 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 687 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 688 689 if (SS.isSet() && !SS.isInvalid()) 690 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 691 /*TemplateKeyword=*/false, 692 TD); 693 else 694 Template = TemplateName(TD); 695 } 696 697 if (IsFunctionTemplate) { 698 // Function templates always go through overload resolution, at which 699 // point we'll perform the various checks (e.g., accessibility) we need 700 // to based on which function we selected. 701 Result.suppressDiagnostics(); 702 703 return NameClassification::FunctionTemplate(Template); 704 } 705 706 return NameClassification::TypeTemplate(Template); 707 } 708 } 709 710 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 711 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 712 DiagnoseUseOfDecl(Type, NameLoc); 713 QualType T = Context.getTypeDeclType(Type); 714 return ParsedType::make(T); 715 } 716 717 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 718 if (!Class) { 719 // FIXME: It's unfortunate that we don't have a Type node for handling this. 720 if (ObjCCompatibleAliasDecl *Alias 721 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 722 Class = Alias->getClassInterface(); 723 } 724 725 if (Class) { 726 DiagnoseUseOfDecl(Class, NameLoc); 727 728 if (NextToken.is(tok::period)) { 729 // Interface. <something> is parsed as a property reference expression. 730 // Just return "unknown" as a fall-through for now. 731 Result.suppressDiagnostics(); 732 return NameClassification::Unknown(); 733 } 734 735 QualType T = Context.getObjCInterfaceType(Class); 736 return ParsedType::make(T); 737 } 738 739 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 740 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 741 742 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 743 return BuildDeclarationNameExpr(SS, Result, ADL); 744} 745 746// Determines the context to return to after temporarily entering a 747// context. This depends in an unnecessarily complicated way on the 748// exact ordering of callbacks from the parser. 749DeclContext *Sema::getContainingDC(DeclContext *DC) { 750 751 // Functions defined inline within classes aren't parsed until we've 752 // finished parsing the top-level class, so the top-level class is 753 // the context we'll need to return to. 754 if (isa<FunctionDecl>(DC)) { 755 DC = DC->getLexicalParent(); 756 757 // A function not defined within a class will always return to its 758 // lexical context. 759 if (!isa<CXXRecordDecl>(DC)) 760 return DC; 761 762 // A C++ inline method/friend is parsed *after* the topmost class 763 // it was declared in is fully parsed ("complete"); the topmost 764 // class is the context we need to return to. 765 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 766 DC = RD; 767 768 // Return the declaration context of the topmost class the inline method is 769 // declared in. 770 return DC; 771 } 772 773 return DC->getLexicalParent(); 774} 775 776void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 777 assert(getContainingDC(DC) == CurContext && 778 "The next DeclContext should be lexically contained in the current one."); 779 CurContext = DC; 780 S->setEntity(DC); 781} 782 783void Sema::PopDeclContext() { 784 assert(CurContext && "DeclContext imbalance!"); 785 786 CurContext = getContainingDC(CurContext); 787 assert(CurContext && "Popped translation unit!"); 788} 789 790/// EnterDeclaratorContext - Used when we must lookup names in the context 791/// of a declarator's nested name specifier. 792/// 793void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 794 // C++0x [basic.lookup.unqual]p13: 795 // A name used in the definition of a static data member of class 796 // X (after the qualified-id of the static member) is looked up as 797 // if the name was used in a member function of X. 798 // C++0x [basic.lookup.unqual]p14: 799 // If a variable member of a namespace is defined outside of the 800 // scope of its namespace then any name used in the definition of 801 // the variable member (after the declarator-id) is looked up as 802 // if the definition of the variable member occurred in its 803 // namespace. 804 // Both of these imply that we should push a scope whose context 805 // is the semantic context of the declaration. We can't use 806 // PushDeclContext here because that context is not necessarily 807 // lexically contained in the current context. Fortunately, 808 // the containing scope should have the appropriate information. 809 810 assert(!S->getEntity() && "scope already has entity"); 811 812#ifndef NDEBUG 813 Scope *Ancestor = S->getParent(); 814 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 815 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 816#endif 817 818 CurContext = DC; 819 S->setEntity(DC); 820} 821 822void Sema::ExitDeclaratorContext(Scope *S) { 823 assert(S->getEntity() == CurContext && "Context imbalance!"); 824 825 // Switch back to the lexical context. The safety of this is 826 // enforced by an assert in EnterDeclaratorContext. 827 Scope *Ancestor = S->getParent(); 828 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 829 CurContext = (DeclContext*) Ancestor->getEntity(); 830 831 // We don't need to do anything with the scope, which is going to 832 // disappear. 833} 834 835 836void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 837 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 838 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 839 // We assume that the caller has already called 840 // ActOnReenterTemplateScope 841 FD = TFD->getTemplatedDecl(); 842 } 843 if (!FD) 844 return; 845 846 PushDeclContext(S, FD); 847 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 848 ParmVarDecl *Param = FD->getParamDecl(P); 849 // If the parameter has an identifier, then add it to the scope 850 if (Param->getIdentifier()) { 851 S->AddDecl(Param); 852 IdResolver.AddDecl(Param); 853 } 854 } 855} 856 857 858/// \brief Determine whether we allow overloading of the function 859/// PrevDecl with another declaration. 860/// 861/// This routine determines whether overloading is possible, not 862/// whether some new function is actually an overload. It will return 863/// true in C++ (where we can always provide overloads) or, as an 864/// extension, in C when the previous function is already an 865/// overloaded function declaration or has the "overloadable" 866/// attribute. 867static bool AllowOverloadingOfFunction(LookupResult &Previous, 868 ASTContext &Context) { 869 if (Context.getLangOptions().CPlusPlus) 870 return true; 871 872 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 873 return true; 874 875 return (Previous.getResultKind() == LookupResult::Found 876 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 877} 878 879/// Add this decl to the scope shadowed decl chains. 880void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 881 // Move up the scope chain until we find the nearest enclosing 882 // non-transparent context. The declaration will be introduced into this 883 // scope. 884 while (S->getEntity() && 885 ((DeclContext *)S->getEntity())->isTransparentContext()) 886 S = S->getParent(); 887 888 // Add scoped declarations into their context, so that they can be 889 // found later. Declarations without a context won't be inserted 890 // into any context. 891 if (AddToContext) 892 CurContext->addDecl(D); 893 894 // Out-of-line definitions shouldn't be pushed into scope in C++. 895 // Out-of-line variable and function definitions shouldn't even in C. 896 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 897 D->isOutOfLine() && 898 !D->getDeclContext()->getRedeclContext()->Equals( 899 D->getLexicalDeclContext()->getRedeclContext())) 900 return; 901 902 // Template instantiations should also not be pushed into scope. 903 if (isa<FunctionDecl>(D) && 904 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 905 return; 906 907 // If this replaces anything in the current scope, 908 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 909 IEnd = IdResolver.end(); 910 for (; I != IEnd; ++I) { 911 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 912 S->RemoveDecl(*I); 913 IdResolver.RemoveDecl(*I); 914 915 // Should only need to replace one decl. 916 break; 917 } 918 } 919 920 S->AddDecl(D); 921 922 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 923 // Implicitly-generated labels may end up getting generated in an order that 924 // isn't strictly lexical, which breaks name lookup. Be careful to insert 925 // the label at the appropriate place in the identifier chain. 926 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 927 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 928 if (IDC == CurContext) { 929 if (!S->isDeclScope(*I)) 930 continue; 931 } else if (IDC->Encloses(CurContext)) 932 break; 933 } 934 935 IdResolver.InsertDeclAfter(I, D); 936 } else { 937 IdResolver.AddDecl(D); 938 } 939} 940 941bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 942 bool ExplicitInstantiationOrSpecialization) { 943 return IdResolver.isDeclInScope(D, Ctx, Context, S, 944 ExplicitInstantiationOrSpecialization); 945} 946 947Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 948 DeclContext *TargetDC = DC->getPrimaryContext(); 949 do { 950 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 951 if (ScopeDC->getPrimaryContext() == TargetDC) 952 return S; 953 } while ((S = S->getParent())); 954 955 return 0; 956} 957 958static bool isOutOfScopePreviousDeclaration(NamedDecl *, 959 DeclContext*, 960 ASTContext&); 961 962/// Filters out lookup results that don't fall within the given scope 963/// as determined by isDeclInScope. 964void Sema::FilterLookupForScope(LookupResult &R, 965 DeclContext *Ctx, Scope *S, 966 bool ConsiderLinkage, 967 bool ExplicitInstantiationOrSpecialization) { 968 LookupResult::Filter F = R.makeFilter(); 969 while (F.hasNext()) { 970 NamedDecl *D = F.next(); 971 972 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 973 continue; 974 975 if (ConsiderLinkage && 976 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 977 continue; 978 979 F.erase(); 980 } 981 982 F.done(); 983} 984 985static bool isUsingDecl(NamedDecl *D) { 986 return isa<UsingShadowDecl>(D) || 987 isa<UnresolvedUsingTypenameDecl>(D) || 988 isa<UnresolvedUsingValueDecl>(D); 989} 990 991/// Removes using shadow declarations from the lookup results. 992static void RemoveUsingDecls(LookupResult &R) { 993 LookupResult::Filter F = R.makeFilter(); 994 while (F.hasNext()) 995 if (isUsingDecl(F.next())) 996 F.erase(); 997 998 F.done(); 999} 1000 1001/// \brief Check for this common pattern: 1002/// @code 1003/// class S { 1004/// S(const S&); // DO NOT IMPLEMENT 1005/// void operator=(const S&); // DO NOT IMPLEMENT 1006/// }; 1007/// @endcode 1008static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1009 // FIXME: Should check for private access too but access is set after we get 1010 // the decl here. 1011 if (D->doesThisDeclarationHaveABody()) 1012 return false; 1013 1014 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1015 return CD->isCopyConstructor(); 1016 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1017 return Method->isCopyAssignmentOperator(); 1018 return false; 1019} 1020 1021bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1022 assert(D); 1023 1024 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 // Ignore class templates. 1028 if (D->getDeclContext()->isDependentContext() || 1029 D->getLexicalDeclContext()->isDependentContext()) 1030 return false; 1031 1032 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1033 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1034 return false; 1035 1036 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1037 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1038 return false; 1039 } else { 1040 // 'static inline' functions are used in headers; don't warn. 1041 if (FD->getStorageClass() == SC_Static && 1042 FD->isInlineSpecified()) 1043 return false; 1044 } 1045 1046 if (FD->doesThisDeclarationHaveABody() && 1047 Context.DeclMustBeEmitted(FD)) 1048 return false; 1049 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1050 if (!VD->isFileVarDecl() || 1051 VD->getType().isConstant(Context) || 1052 Context.DeclMustBeEmitted(VD)) 1053 return false; 1054 1055 if (VD->isStaticDataMember() && 1056 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1057 return false; 1058 1059 } else { 1060 return false; 1061 } 1062 1063 // Only warn for unused decls internal to the translation unit. 1064 if (D->getLinkage() == ExternalLinkage) 1065 return false; 1066 1067 return true; 1068} 1069 1070void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1071 if (!D) 1072 return; 1073 1074 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1075 const FunctionDecl *First = FD->getFirstDeclaration(); 1076 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1077 return; // First should already be in the vector. 1078 } 1079 1080 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1081 const VarDecl *First = VD->getFirstDeclaration(); 1082 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1083 return; // First should already be in the vector. 1084 } 1085 1086 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1087 UnusedFileScopedDecls.push_back(D); 1088 } 1089 1090static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1091 if (D->isInvalidDecl()) 1092 return false; 1093 1094 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1095 return false; 1096 1097 if (isa<LabelDecl>(D)) 1098 return true; 1099 1100 // White-list anything that isn't a local variable. 1101 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1102 !D->getDeclContext()->isFunctionOrMethod()) 1103 return false; 1104 1105 // Types of valid local variables should be complete, so this should succeed. 1106 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1107 1108 // White-list anything with an __attribute__((unused)) type. 1109 QualType Ty = VD->getType(); 1110 1111 // Only look at the outermost level of typedef. 1112 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1113 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1114 return false; 1115 } 1116 1117 // If we failed to complete the type for some reason, or if the type is 1118 // dependent, don't diagnose the variable. 1119 if (Ty->isIncompleteType() || Ty->isDependentType()) 1120 return false; 1121 1122 if (const TagType *TT = Ty->getAs<TagType>()) { 1123 const TagDecl *Tag = TT->getDecl(); 1124 if (Tag->hasAttr<UnusedAttr>()) 1125 return false; 1126 1127 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1128 // FIXME: Checking for the presence of a user-declared constructor 1129 // isn't completely accurate; we'd prefer to check that the initializer 1130 // has no side effects. 1131 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1132 return false; 1133 } 1134 } 1135 1136 // TODO: __attribute__((unused)) templates? 1137 } 1138 1139 return true; 1140} 1141 1142static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1143 FixItHint &Hint) { 1144 if (isa<LabelDecl>(D)) { 1145 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1146 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1147 if (AfterColon.isInvalid()) 1148 return; 1149 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1150 getCharRange(D->getLocStart(), AfterColon)); 1151 } 1152 return; 1153} 1154 1155/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1156/// unless they are marked attr(unused). 1157void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1158 FixItHint Hint; 1159 if (!ShouldDiagnoseUnusedDecl(D)) 1160 return; 1161 1162 GenerateFixForUnusedDecl(D, Context, Hint); 1163 1164 unsigned DiagID; 1165 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1166 DiagID = diag::warn_unused_exception_param; 1167 else if (isa<LabelDecl>(D)) 1168 DiagID = diag::warn_unused_label; 1169 else 1170 DiagID = diag::warn_unused_variable; 1171 1172 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1173} 1174 1175static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1176 // Verify that we have no forward references left. If so, there was a goto 1177 // or address of a label taken, but no definition of it. Label fwd 1178 // definitions are indicated with a null substmt. 1179 if (L->getStmt() == 0) 1180 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1181} 1182 1183void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1184 if (S->decl_empty()) return; 1185 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1186 "Scope shouldn't contain decls!"); 1187 1188 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1189 I != E; ++I) { 1190 Decl *TmpD = (*I); 1191 assert(TmpD && "This decl didn't get pushed??"); 1192 1193 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1194 NamedDecl *D = cast<NamedDecl>(TmpD); 1195 1196 if (!D->getDeclName()) continue; 1197 1198 // Diagnose unused variables in this scope. 1199 if (!S->hasErrorOccurred()) 1200 DiagnoseUnusedDecl(D); 1201 1202 // If this was a forward reference to a label, verify it was defined. 1203 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1204 CheckPoppedLabel(LD, *this); 1205 1206 // Remove this name from our lexical scope. 1207 IdResolver.RemoveDecl(D); 1208 } 1209} 1210 1211/// \brief Look for an Objective-C class in the translation unit. 1212/// 1213/// \param Id The name of the Objective-C class we're looking for. If 1214/// typo-correction fixes this name, the Id will be updated 1215/// to the fixed name. 1216/// 1217/// \param IdLoc The location of the name in the translation unit. 1218/// 1219/// \param TypoCorrection If true, this routine will attempt typo correction 1220/// if there is no class with the given name. 1221/// 1222/// \returns The declaration of the named Objective-C class, or NULL if the 1223/// class could not be found. 1224ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1225 SourceLocation IdLoc, 1226 bool DoTypoCorrection) { 1227 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1228 // creation from this context. 1229 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1230 1231 if (!IDecl && DoTypoCorrection) { 1232 // Perform typo correction at the given location, but only if we 1233 // find an Objective-C class name. 1234 TypoCorrection C; 1235 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1236 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1237 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1238 Diag(IdLoc, diag::err_undef_interface_suggest) 1239 << Id << IDecl->getDeclName() 1240 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1241 Diag(IDecl->getLocation(), diag::note_previous_decl) 1242 << IDecl->getDeclName(); 1243 1244 Id = IDecl->getIdentifier(); 1245 } 1246 } 1247 1248 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1249} 1250 1251/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1252/// from S, where a non-field would be declared. This routine copes 1253/// with the difference between C and C++ scoping rules in structs and 1254/// unions. For example, the following code is well-formed in C but 1255/// ill-formed in C++: 1256/// @code 1257/// struct S6 { 1258/// enum { BAR } e; 1259/// }; 1260/// 1261/// void test_S6() { 1262/// struct S6 a; 1263/// a.e = BAR; 1264/// } 1265/// @endcode 1266/// For the declaration of BAR, this routine will return a different 1267/// scope. The scope S will be the scope of the unnamed enumeration 1268/// within S6. In C++, this routine will return the scope associated 1269/// with S6, because the enumeration's scope is a transparent 1270/// context but structures can contain non-field names. In C, this 1271/// routine will return the translation unit scope, since the 1272/// enumeration's scope is a transparent context and structures cannot 1273/// contain non-field names. 1274Scope *Sema::getNonFieldDeclScope(Scope *S) { 1275 while (((S->getFlags() & Scope::DeclScope) == 0) || 1276 (S->getEntity() && 1277 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1278 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1279 S = S->getParent(); 1280 return S; 1281} 1282 1283/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1284/// file scope. lazily create a decl for it. ForRedeclaration is true 1285/// if we're creating this built-in in anticipation of redeclaring the 1286/// built-in. 1287NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1288 Scope *S, bool ForRedeclaration, 1289 SourceLocation Loc) { 1290 Builtin::ID BID = (Builtin::ID)bid; 1291 1292 ASTContext::GetBuiltinTypeError Error; 1293 QualType R = Context.GetBuiltinType(BID, Error); 1294 switch (Error) { 1295 case ASTContext::GE_None: 1296 // Okay 1297 break; 1298 1299 case ASTContext::GE_Missing_stdio: 1300 if (ForRedeclaration) 1301 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1302 << Context.BuiltinInfo.GetName(BID); 1303 return 0; 1304 1305 case ASTContext::GE_Missing_setjmp: 1306 if (ForRedeclaration) 1307 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1308 << Context.BuiltinInfo.GetName(BID); 1309 return 0; 1310 } 1311 1312 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1313 Diag(Loc, diag::ext_implicit_lib_function_decl) 1314 << Context.BuiltinInfo.GetName(BID) 1315 << R; 1316 if (Context.BuiltinInfo.getHeaderName(BID) && 1317 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1318 != DiagnosticsEngine::Ignored) 1319 Diag(Loc, diag::note_please_include_header) 1320 << Context.BuiltinInfo.getHeaderName(BID) 1321 << Context.BuiltinInfo.GetName(BID); 1322 } 1323 1324 FunctionDecl *New = FunctionDecl::Create(Context, 1325 Context.getTranslationUnitDecl(), 1326 Loc, Loc, II, R, /*TInfo=*/0, 1327 SC_Extern, 1328 SC_None, false, 1329 /*hasPrototype=*/true); 1330 New->setImplicit(); 1331 1332 // Create Decl objects for each parameter, adding them to the 1333 // FunctionDecl. 1334 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1335 SmallVector<ParmVarDecl*, 16> Params; 1336 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1337 ParmVarDecl *parm = 1338 ParmVarDecl::Create(Context, New, SourceLocation(), 1339 SourceLocation(), 0, 1340 FT->getArgType(i), /*TInfo=*/0, 1341 SC_None, SC_None, 0); 1342 parm->setScopeInfo(0, i); 1343 Params.push_back(parm); 1344 } 1345 New->setParams(Params); 1346 } 1347 1348 AddKnownFunctionAttributes(New); 1349 1350 // TUScope is the translation-unit scope to insert this function into. 1351 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1352 // relate Scopes to DeclContexts, and probably eliminate CurContext 1353 // entirely, but we're not there yet. 1354 DeclContext *SavedContext = CurContext; 1355 CurContext = Context.getTranslationUnitDecl(); 1356 PushOnScopeChains(New, TUScope); 1357 CurContext = SavedContext; 1358 return New; 1359} 1360 1361/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1362/// same name and scope as a previous declaration 'Old'. Figure out 1363/// how to resolve this situation, merging decls or emitting 1364/// diagnostics as appropriate. If there was an error, set New to be invalid. 1365/// 1366void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1367 // If the new decl is known invalid already, don't bother doing any 1368 // merging checks. 1369 if (New->isInvalidDecl()) return; 1370 1371 // Allow multiple definitions for ObjC built-in typedefs. 1372 // FIXME: Verify the underlying types are equivalent! 1373 if (getLangOptions().ObjC1) { 1374 const IdentifierInfo *TypeID = New->getIdentifier(); 1375 switch (TypeID->getLength()) { 1376 default: break; 1377 case 2: 1378 if (!TypeID->isStr("id")) 1379 break; 1380 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1381 // Install the built-in type for 'id', ignoring the current definition. 1382 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1383 return; 1384 case 5: 1385 if (!TypeID->isStr("Class")) 1386 break; 1387 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1388 // Install the built-in type for 'Class', ignoring the current definition. 1389 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1390 return; 1391 case 3: 1392 if (!TypeID->isStr("SEL")) 1393 break; 1394 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1395 // Install the built-in type for 'SEL', ignoring the current definition. 1396 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1397 return; 1398 } 1399 // Fall through - the typedef name was not a builtin type. 1400 } 1401 1402 // Verify the old decl was also a type. 1403 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1404 if (!Old) { 1405 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1406 << New->getDeclName(); 1407 1408 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1409 if (OldD->getLocation().isValid()) 1410 Diag(OldD->getLocation(), diag::note_previous_definition); 1411 1412 return New->setInvalidDecl(); 1413 } 1414 1415 // If the old declaration is invalid, just give up here. 1416 if (Old->isInvalidDecl()) 1417 return New->setInvalidDecl(); 1418 1419 // Determine the "old" type we'll use for checking and diagnostics. 1420 QualType OldType; 1421 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1422 OldType = OldTypedef->getUnderlyingType(); 1423 else 1424 OldType = Context.getTypeDeclType(Old); 1425 1426 // If the typedef types are not identical, reject them in all languages and 1427 // with any extensions enabled. 1428 1429 if (OldType != New->getUnderlyingType() && 1430 Context.getCanonicalType(OldType) != 1431 Context.getCanonicalType(New->getUnderlyingType())) { 1432 int Kind = 0; 1433 if (isa<TypeAliasDecl>(Old)) 1434 Kind = 1; 1435 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1436 << Kind << New->getUnderlyingType() << OldType; 1437 if (Old->getLocation().isValid()) 1438 Diag(Old->getLocation(), diag::note_previous_definition); 1439 return New->setInvalidDecl(); 1440 } 1441 1442 // The types match. Link up the redeclaration chain if the old 1443 // declaration was a typedef. 1444 // FIXME: this is a potential source of weirdness if the type 1445 // spellings don't match exactly. 1446 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1447 New->setPreviousDeclaration(Typedef); 1448 1449 // __module_private__ is propagated to later declarations. 1450 if (Old->isModulePrivate()) 1451 New->setModulePrivate(); 1452 else if (New->isModulePrivate()) 1453 diagnoseModulePrivateRedeclaration(New, Old); 1454 1455 if (getLangOptions().MicrosoftExt) 1456 return; 1457 1458 if (getLangOptions().CPlusPlus) { 1459 // C++ [dcl.typedef]p2: 1460 // In a given non-class scope, a typedef specifier can be used to 1461 // redefine the name of any type declared in that scope to refer 1462 // to the type to which it already refers. 1463 if (!isa<CXXRecordDecl>(CurContext)) 1464 return; 1465 1466 // C++0x [dcl.typedef]p4: 1467 // In a given class scope, a typedef specifier can be used to redefine 1468 // any class-name declared in that scope that is not also a typedef-name 1469 // to refer to the type to which it already refers. 1470 // 1471 // This wording came in via DR424, which was a correction to the 1472 // wording in DR56, which accidentally banned code like: 1473 // 1474 // struct S { 1475 // typedef struct A { } A; 1476 // }; 1477 // 1478 // in the C++03 standard. We implement the C++0x semantics, which 1479 // allow the above but disallow 1480 // 1481 // struct S { 1482 // typedef int I; 1483 // typedef int I; 1484 // }; 1485 // 1486 // since that was the intent of DR56. 1487 if (!isa<TypedefNameDecl>(Old)) 1488 return; 1489 1490 Diag(New->getLocation(), diag::err_redefinition) 1491 << New->getDeclName(); 1492 Diag(Old->getLocation(), diag::note_previous_definition); 1493 return New->setInvalidDecl(); 1494 } 1495 1496 // If we have a redefinition of a typedef in C, emit a warning. This warning 1497 // is normally mapped to an error, but can be controlled with 1498 // -Wtypedef-redefinition. If either the original or the redefinition is 1499 // in a system header, don't emit this for compatibility with GCC. 1500 if (getDiagnostics().getSuppressSystemWarnings() && 1501 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1502 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1503 return; 1504 1505 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1506 << New->getDeclName(); 1507 Diag(Old->getLocation(), diag::note_previous_definition); 1508 return; 1509} 1510 1511/// DeclhasAttr - returns true if decl Declaration already has the target 1512/// attribute. 1513static bool 1514DeclHasAttr(const Decl *D, const Attr *A) { 1515 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1516 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1517 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1518 if ((*i)->getKind() == A->getKind()) { 1519 if (Ann) { 1520 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1521 return true; 1522 continue; 1523 } 1524 // FIXME: Don't hardcode this check 1525 if (OA && isa<OwnershipAttr>(*i)) 1526 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1527 return true; 1528 } 1529 1530 return false; 1531} 1532 1533/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1534static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1535 ASTContext &C, bool mergeDeprecation = true) { 1536 if (!oldDecl->hasAttrs()) 1537 return; 1538 1539 bool foundAny = newDecl->hasAttrs(); 1540 1541 // Ensure that any moving of objects within the allocated map is done before 1542 // we process them. 1543 if (!foundAny) newDecl->setAttrs(AttrVec()); 1544 1545 for (specific_attr_iterator<InheritableAttr> 1546 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1547 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1548 // Ignore deprecated/unavailable/availability attributes if requested. 1549 if (!mergeDeprecation && 1550 (isa<DeprecatedAttr>(*i) || 1551 isa<UnavailableAttr>(*i) || 1552 isa<AvailabilityAttr>(*i))) 1553 continue; 1554 1555 if (!DeclHasAttr(newDecl, *i)) { 1556 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1557 newAttr->setInherited(true); 1558 newDecl->addAttr(newAttr); 1559 foundAny = true; 1560 } 1561 } 1562 1563 if (!foundAny) newDecl->dropAttrs(); 1564} 1565 1566/// mergeParamDeclAttributes - Copy attributes from the old parameter 1567/// to the new one. 1568static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1569 const ParmVarDecl *oldDecl, 1570 ASTContext &C) { 1571 if (!oldDecl->hasAttrs()) 1572 return; 1573 1574 bool foundAny = newDecl->hasAttrs(); 1575 1576 // Ensure that any moving of objects within the allocated map is 1577 // done before we process them. 1578 if (!foundAny) newDecl->setAttrs(AttrVec()); 1579 1580 for (specific_attr_iterator<InheritableParamAttr> 1581 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1582 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1583 if (!DeclHasAttr(newDecl, *i)) { 1584 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1585 newAttr->setInherited(true); 1586 newDecl->addAttr(newAttr); 1587 foundAny = true; 1588 } 1589 } 1590 1591 if (!foundAny) newDecl->dropAttrs(); 1592} 1593 1594namespace { 1595 1596/// Used in MergeFunctionDecl to keep track of function parameters in 1597/// C. 1598struct GNUCompatibleParamWarning { 1599 ParmVarDecl *OldParm; 1600 ParmVarDecl *NewParm; 1601 QualType PromotedType; 1602}; 1603 1604} 1605 1606/// getSpecialMember - get the special member enum for a method. 1607Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1608 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1609 if (Ctor->isDefaultConstructor()) 1610 return Sema::CXXDefaultConstructor; 1611 1612 if (Ctor->isCopyConstructor()) 1613 return Sema::CXXCopyConstructor; 1614 1615 if (Ctor->isMoveConstructor()) 1616 return Sema::CXXMoveConstructor; 1617 } else if (isa<CXXDestructorDecl>(MD)) { 1618 return Sema::CXXDestructor; 1619 } else if (MD->isCopyAssignmentOperator()) { 1620 return Sema::CXXCopyAssignment; 1621 } else if (MD->isMoveAssignmentOperator()) { 1622 return Sema::CXXMoveAssignment; 1623 } 1624 1625 return Sema::CXXInvalid; 1626} 1627 1628/// canRedefineFunction - checks if a function can be redefined. Currently, 1629/// only extern inline functions can be redefined, and even then only in 1630/// GNU89 mode. 1631static bool canRedefineFunction(const FunctionDecl *FD, 1632 const LangOptions& LangOpts) { 1633 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1634 !LangOpts.CPlusPlus && 1635 FD->isInlineSpecified() && 1636 FD->getStorageClass() == SC_Extern); 1637} 1638 1639/// MergeFunctionDecl - We just parsed a function 'New' from 1640/// declarator D which has the same name and scope as a previous 1641/// declaration 'Old'. Figure out how to resolve this situation, 1642/// merging decls or emitting diagnostics as appropriate. 1643/// 1644/// In C++, New and Old must be declarations that are not 1645/// overloaded. Use IsOverload to determine whether New and Old are 1646/// overloaded, and to select the Old declaration that New should be 1647/// merged with. 1648/// 1649/// Returns true if there was an error, false otherwise. 1650bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1651 // Verify the old decl was also a function. 1652 FunctionDecl *Old = 0; 1653 if (FunctionTemplateDecl *OldFunctionTemplate 1654 = dyn_cast<FunctionTemplateDecl>(OldD)) 1655 Old = OldFunctionTemplate->getTemplatedDecl(); 1656 else 1657 Old = dyn_cast<FunctionDecl>(OldD); 1658 if (!Old) { 1659 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1660 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1661 Diag(Shadow->getTargetDecl()->getLocation(), 1662 diag::note_using_decl_target); 1663 Diag(Shadow->getUsingDecl()->getLocation(), 1664 diag::note_using_decl) << 0; 1665 return true; 1666 } 1667 1668 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1669 << New->getDeclName(); 1670 Diag(OldD->getLocation(), diag::note_previous_definition); 1671 return true; 1672 } 1673 1674 // Determine whether the previous declaration was a definition, 1675 // implicit declaration, or a declaration. 1676 diag::kind PrevDiag; 1677 if (Old->isThisDeclarationADefinition()) 1678 PrevDiag = diag::note_previous_definition; 1679 else if (Old->isImplicit()) 1680 PrevDiag = diag::note_previous_implicit_declaration; 1681 else 1682 PrevDiag = diag::note_previous_declaration; 1683 1684 QualType OldQType = Context.getCanonicalType(Old->getType()); 1685 QualType NewQType = Context.getCanonicalType(New->getType()); 1686 1687 // Don't complain about this if we're in GNU89 mode and the old function 1688 // is an extern inline function. 1689 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1690 New->getStorageClass() == SC_Static && 1691 Old->getStorageClass() != SC_Static && 1692 !canRedefineFunction(Old, getLangOptions())) { 1693 if (getLangOptions().MicrosoftExt) { 1694 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1695 Diag(Old->getLocation(), PrevDiag); 1696 } else { 1697 Diag(New->getLocation(), diag::err_static_non_static) << New; 1698 Diag(Old->getLocation(), PrevDiag); 1699 return true; 1700 } 1701 } 1702 1703 // If a function is first declared with a calling convention, but is 1704 // later declared or defined without one, the second decl assumes the 1705 // calling convention of the first. 1706 // 1707 // For the new decl, we have to look at the NON-canonical type to tell the 1708 // difference between a function that really doesn't have a calling 1709 // convention and one that is declared cdecl. That's because in 1710 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1711 // because it is the default calling convention. 1712 // 1713 // Note also that we DO NOT return at this point, because we still have 1714 // other tests to run. 1715 const FunctionType *OldType = cast<FunctionType>(OldQType); 1716 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1717 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1718 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1719 bool RequiresAdjustment = false; 1720 if (OldTypeInfo.getCC() != CC_Default && 1721 NewTypeInfo.getCC() == CC_Default) { 1722 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1723 RequiresAdjustment = true; 1724 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1725 NewTypeInfo.getCC())) { 1726 // Calling conventions really aren't compatible, so complain. 1727 Diag(New->getLocation(), diag::err_cconv_change) 1728 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1729 << (OldTypeInfo.getCC() == CC_Default) 1730 << (OldTypeInfo.getCC() == CC_Default ? "" : 1731 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1732 Diag(Old->getLocation(), diag::note_previous_declaration); 1733 return true; 1734 } 1735 1736 // FIXME: diagnose the other way around? 1737 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1738 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1739 RequiresAdjustment = true; 1740 } 1741 1742 // Merge regparm attribute. 1743 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1744 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1745 if (NewTypeInfo.getHasRegParm()) { 1746 Diag(New->getLocation(), diag::err_regparm_mismatch) 1747 << NewType->getRegParmType() 1748 << OldType->getRegParmType(); 1749 Diag(Old->getLocation(), diag::note_previous_declaration); 1750 return true; 1751 } 1752 1753 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1754 RequiresAdjustment = true; 1755 } 1756 1757 // Merge ns_returns_retained attribute. 1758 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1759 if (NewTypeInfo.getProducesResult()) { 1760 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1761 Diag(Old->getLocation(), diag::note_previous_declaration); 1762 return true; 1763 } 1764 1765 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1766 RequiresAdjustment = true; 1767 } 1768 1769 if (RequiresAdjustment) { 1770 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1771 New->setType(QualType(NewType, 0)); 1772 NewQType = Context.getCanonicalType(New->getType()); 1773 } 1774 1775 if (getLangOptions().CPlusPlus) { 1776 // (C++98 13.1p2): 1777 // Certain function declarations cannot be overloaded: 1778 // -- Function declarations that differ only in the return type 1779 // cannot be overloaded. 1780 QualType OldReturnType = OldType->getResultType(); 1781 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1782 QualType ResQT; 1783 if (OldReturnType != NewReturnType) { 1784 if (NewReturnType->isObjCObjectPointerType() 1785 && OldReturnType->isObjCObjectPointerType()) 1786 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1787 if (ResQT.isNull()) { 1788 if (New->isCXXClassMember() && New->isOutOfLine()) 1789 Diag(New->getLocation(), 1790 diag::err_member_def_does_not_match_ret_type) << New; 1791 else 1792 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1793 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1794 return true; 1795 } 1796 else 1797 NewQType = ResQT; 1798 } 1799 1800 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1801 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1802 if (OldMethod && NewMethod) { 1803 // Preserve triviality. 1804 NewMethod->setTrivial(OldMethod->isTrivial()); 1805 1806 // MSVC allows explicit template specialization at class scope: 1807 // 2 CXMethodDecls referring to the same function will be injected. 1808 // We don't want a redeclartion error. 1809 bool IsClassScopeExplicitSpecialization = 1810 OldMethod->isFunctionTemplateSpecialization() && 1811 NewMethod->isFunctionTemplateSpecialization(); 1812 bool isFriend = NewMethod->getFriendObjectKind(); 1813 1814 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1815 !IsClassScopeExplicitSpecialization) { 1816 // -- Member function declarations with the same name and the 1817 // same parameter types cannot be overloaded if any of them 1818 // is a static member function declaration. 1819 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1820 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1821 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1822 return true; 1823 } 1824 1825 // C++ [class.mem]p1: 1826 // [...] A member shall not be declared twice in the 1827 // member-specification, except that a nested class or member 1828 // class template can be declared and then later defined. 1829 unsigned NewDiag; 1830 if (isa<CXXConstructorDecl>(OldMethod)) 1831 NewDiag = diag::err_constructor_redeclared; 1832 else if (isa<CXXDestructorDecl>(NewMethod)) 1833 NewDiag = diag::err_destructor_redeclared; 1834 else if (isa<CXXConversionDecl>(NewMethod)) 1835 NewDiag = diag::err_conv_function_redeclared; 1836 else 1837 NewDiag = diag::err_member_redeclared; 1838 1839 Diag(New->getLocation(), NewDiag); 1840 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1841 1842 // Complain if this is an explicit declaration of a special 1843 // member that was initially declared implicitly. 1844 // 1845 // As an exception, it's okay to befriend such methods in order 1846 // to permit the implicit constructor/destructor/operator calls. 1847 } else if (OldMethod->isImplicit()) { 1848 if (isFriend) { 1849 NewMethod->setImplicit(); 1850 } else { 1851 Diag(NewMethod->getLocation(), 1852 diag::err_definition_of_implicitly_declared_member) 1853 << New << getSpecialMember(OldMethod); 1854 return true; 1855 } 1856 } else if (OldMethod->isExplicitlyDefaulted()) { 1857 Diag(NewMethod->getLocation(), 1858 diag::err_definition_of_explicitly_defaulted_member) 1859 << getSpecialMember(OldMethod); 1860 return true; 1861 } 1862 } 1863 1864 // (C++98 8.3.5p3): 1865 // All declarations for a function shall agree exactly in both the 1866 // return type and the parameter-type-list. 1867 // We also want to respect all the extended bits except noreturn. 1868 1869 // noreturn should now match unless the old type info didn't have it. 1870 QualType OldQTypeForComparison = OldQType; 1871 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1872 assert(OldQType == QualType(OldType, 0)); 1873 const FunctionType *OldTypeForComparison 1874 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1875 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1876 assert(OldQTypeForComparison.isCanonical()); 1877 } 1878 1879 if (OldQTypeForComparison == NewQType) 1880 return MergeCompatibleFunctionDecls(New, Old); 1881 1882 // Fall through for conflicting redeclarations and redefinitions. 1883 } 1884 1885 // C: Function types need to be compatible, not identical. This handles 1886 // duplicate function decls like "void f(int); void f(enum X);" properly. 1887 if (!getLangOptions().CPlusPlus && 1888 Context.typesAreCompatible(OldQType, NewQType)) { 1889 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1890 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1891 const FunctionProtoType *OldProto = 0; 1892 if (isa<FunctionNoProtoType>(NewFuncType) && 1893 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1894 // The old declaration provided a function prototype, but the 1895 // new declaration does not. Merge in the prototype. 1896 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1897 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1898 OldProto->arg_type_end()); 1899 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1900 ParamTypes.data(), ParamTypes.size(), 1901 OldProto->getExtProtoInfo()); 1902 New->setType(NewQType); 1903 New->setHasInheritedPrototype(); 1904 1905 // Synthesize a parameter for each argument type. 1906 SmallVector<ParmVarDecl*, 16> Params; 1907 for (FunctionProtoType::arg_type_iterator 1908 ParamType = OldProto->arg_type_begin(), 1909 ParamEnd = OldProto->arg_type_end(); 1910 ParamType != ParamEnd; ++ParamType) { 1911 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1912 SourceLocation(), 1913 SourceLocation(), 0, 1914 *ParamType, /*TInfo=*/0, 1915 SC_None, SC_None, 1916 0); 1917 Param->setScopeInfo(0, Params.size()); 1918 Param->setImplicit(); 1919 Params.push_back(Param); 1920 } 1921 1922 New->setParams(Params); 1923 } 1924 1925 return MergeCompatibleFunctionDecls(New, Old); 1926 } 1927 1928 // GNU C permits a K&R definition to follow a prototype declaration 1929 // if the declared types of the parameters in the K&R definition 1930 // match the types in the prototype declaration, even when the 1931 // promoted types of the parameters from the K&R definition differ 1932 // from the types in the prototype. GCC then keeps the types from 1933 // the prototype. 1934 // 1935 // If a variadic prototype is followed by a non-variadic K&R definition, 1936 // the K&R definition becomes variadic. This is sort of an edge case, but 1937 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1938 // C99 6.9.1p8. 1939 if (!getLangOptions().CPlusPlus && 1940 Old->hasPrototype() && !New->hasPrototype() && 1941 New->getType()->getAs<FunctionProtoType>() && 1942 Old->getNumParams() == New->getNumParams()) { 1943 SmallVector<QualType, 16> ArgTypes; 1944 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1945 const FunctionProtoType *OldProto 1946 = Old->getType()->getAs<FunctionProtoType>(); 1947 const FunctionProtoType *NewProto 1948 = New->getType()->getAs<FunctionProtoType>(); 1949 1950 // Determine whether this is the GNU C extension. 1951 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1952 NewProto->getResultType()); 1953 bool LooseCompatible = !MergedReturn.isNull(); 1954 for (unsigned Idx = 0, End = Old->getNumParams(); 1955 LooseCompatible && Idx != End; ++Idx) { 1956 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1957 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1958 if (Context.typesAreCompatible(OldParm->getType(), 1959 NewProto->getArgType(Idx))) { 1960 ArgTypes.push_back(NewParm->getType()); 1961 } else if (Context.typesAreCompatible(OldParm->getType(), 1962 NewParm->getType(), 1963 /*CompareUnqualified=*/true)) { 1964 GNUCompatibleParamWarning Warn 1965 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1966 Warnings.push_back(Warn); 1967 ArgTypes.push_back(NewParm->getType()); 1968 } else 1969 LooseCompatible = false; 1970 } 1971 1972 if (LooseCompatible) { 1973 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1974 Diag(Warnings[Warn].NewParm->getLocation(), 1975 diag::ext_param_promoted_not_compatible_with_prototype) 1976 << Warnings[Warn].PromotedType 1977 << Warnings[Warn].OldParm->getType(); 1978 if (Warnings[Warn].OldParm->getLocation().isValid()) 1979 Diag(Warnings[Warn].OldParm->getLocation(), 1980 diag::note_previous_declaration); 1981 } 1982 1983 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1984 ArgTypes.size(), 1985 OldProto->getExtProtoInfo())); 1986 return MergeCompatibleFunctionDecls(New, Old); 1987 } 1988 1989 // Fall through to diagnose conflicting types. 1990 } 1991 1992 // A function that has already been declared has been redeclared or defined 1993 // with a different type- show appropriate diagnostic 1994 if (unsigned BuiltinID = Old->getBuiltinID()) { 1995 // The user has declared a builtin function with an incompatible 1996 // signature. 1997 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1998 // The function the user is redeclaring is a library-defined 1999 // function like 'malloc' or 'printf'. Warn about the 2000 // redeclaration, then pretend that we don't know about this 2001 // library built-in. 2002 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2003 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2004 << Old << Old->getType(); 2005 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2006 Old->setInvalidDecl(); 2007 return false; 2008 } 2009 2010 PrevDiag = diag::note_previous_builtin_declaration; 2011 } 2012 2013 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2014 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2015 return true; 2016} 2017 2018/// \brief Completes the merge of two function declarations that are 2019/// known to be compatible. 2020/// 2021/// This routine handles the merging of attributes and other 2022/// properties of function declarations form the old declaration to 2023/// the new declaration, once we know that New is in fact a 2024/// redeclaration of Old. 2025/// 2026/// \returns false 2027bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2028 // Merge the attributes 2029 mergeDeclAttributes(New, Old, Context); 2030 2031 // Merge the storage class. 2032 if (Old->getStorageClass() != SC_Extern && 2033 Old->getStorageClass() != SC_None) 2034 New->setStorageClass(Old->getStorageClass()); 2035 2036 // Merge "pure" flag. 2037 if (Old->isPure()) 2038 New->setPure(); 2039 2040 // __module_private__ is propagated to later declarations. 2041 if (Old->isModulePrivate()) 2042 New->setModulePrivate(); 2043 else if (New->isModulePrivate()) 2044 diagnoseModulePrivateRedeclaration(New, Old); 2045 2046 // Merge attributes from the parameters. These can mismatch with K&R 2047 // declarations. 2048 if (New->getNumParams() == Old->getNumParams()) 2049 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2050 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2051 Context); 2052 2053 if (getLangOptions().CPlusPlus) 2054 return MergeCXXFunctionDecl(New, Old); 2055 2056 return false; 2057} 2058 2059 2060void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2061 const ObjCMethodDecl *oldMethod) { 2062 // We don't want to merge unavailable and deprecated attributes 2063 // except from interface to implementation. 2064 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2065 2066 // Merge the attributes. 2067 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2068 2069 // Merge attributes from the parameters. 2070 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2071 for (ObjCMethodDecl::param_iterator 2072 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2073 ni != ne; ++ni, ++oi) 2074 mergeParamDeclAttributes(*ni, *oi, Context); 2075 2076 CheckObjCMethodOverride(newMethod, oldMethod, true); 2077} 2078 2079/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2080/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2081/// emitting diagnostics as appropriate. 2082/// 2083/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2084/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2085/// check them before the initializer is attached. 2086/// 2087void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2088 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2089 return; 2090 2091 QualType MergedT; 2092 if (getLangOptions().CPlusPlus) { 2093 AutoType *AT = New->getType()->getContainedAutoType(); 2094 if (AT && !AT->isDeduced()) { 2095 // We don't know what the new type is until the initializer is attached. 2096 return; 2097 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2098 // These could still be something that needs exception specs checked. 2099 return MergeVarDeclExceptionSpecs(New, Old); 2100 } 2101 // C++ [basic.link]p10: 2102 // [...] the types specified by all declarations referring to a given 2103 // object or function shall be identical, except that declarations for an 2104 // array object can specify array types that differ by the presence or 2105 // absence of a major array bound (8.3.4). 2106 else if (Old->getType()->isIncompleteArrayType() && 2107 New->getType()->isArrayType()) { 2108 CanQual<ArrayType> OldArray 2109 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2110 CanQual<ArrayType> NewArray 2111 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2112 if (OldArray->getElementType() == NewArray->getElementType()) 2113 MergedT = New->getType(); 2114 } else if (Old->getType()->isArrayType() && 2115 New->getType()->isIncompleteArrayType()) { 2116 CanQual<ArrayType> OldArray 2117 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2118 CanQual<ArrayType> NewArray 2119 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2120 if (OldArray->getElementType() == NewArray->getElementType()) 2121 MergedT = Old->getType(); 2122 } else if (New->getType()->isObjCObjectPointerType() 2123 && Old->getType()->isObjCObjectPointerType()) { 2124 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2125 Old->getType()); 2126 } 2127 } else { 2128 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2129 } 2130 if (MergedT.isNull()) { 2131 Diag(New->getLocation(), diag::err_redefinition_different_type) 2132 << New->getDeclName(); 2133 Diag(Old->getLocation(), diag::note_previous_definition); 2134 return New->setInvalidDecl(); 2135 } 2136 New->setType(MergedT); 2137} 2138 2139/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2140/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2141/// situation, merging decls or emitting diagnostics as appropriate. 2142/// 2143/// Tentative definition rules (C99 6.9.2p2) are checked by 2144/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2145/// definitions here, since the initializer hasn't been attached. 2146/// 2147void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2148 // If the new decl is already invalid, don't do any other checking. 2149 if (New->isInvalidDecl()) 2150 return; 2151 2152 // Verify the old decl was also a variable. 2153 VarDecl *Old = 0; 2154 if (!Previous.isSingleResult() || 2155 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2156 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2157 << New->getDeclName(); 2158 Diag(Previous.getRepresentativeDecl()->getLocation(), 2159 diag::note_previous_definition); 2160 return New->setInvalidDecl(); 2161 } 2162 2163 // C++ [class.mem]p1: 2164 // A member shall not be declared twice in the member-specification [...] 2165 // 2166 // Here, we need only consider static data members. 2167 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2168 Diag(New->getLocation(), diag::err_duplicate_member) 2169 << New->getIdentifier(); 2170 Diag(Old->getLocation(), diag::note_previous_declaration); 2171 New->setInvalidDecl(); 2172 } 2173 2174 mergeDeclAttributes(New, Old, Context); 2175 // Warn if an already-declared variable is made a weak_import in a subsequent 2176 // declaration 2177 if (New->getAttr<WeakImportAttr>() && 2178 Old->getStorageClass() == SC_None && 2179 !Old->getAttr<WeakImportAttr>()) { 2180 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2181 Diag(Old->getLocation(), diag::note_previous_definition); 2182 // Remove weak_import attribute on new declaration. 2183 New->dropAttr<WeakImportAttr>(); 2184 } 2185 2186 // Merge the types. 2187 MergeVarDeclTypes(New, Old); 2188 if (New->isInvalidDecl()) 2189 return; 2190 2191 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2192 if (New->getStorageClass() == SC_Static && 2193 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2194 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2195 Diag(Old->getLocation(), diag::note_previous_definition); 2196 return New->setInvalidDecl(); 2197 } 2198 // C99 6.2.2p4: 2199 // For an identifier declared with the storage-class specifier 2200 // extern in a scope in which a prior declaration of that 2201 // identifier is visible,23) if the prior declaration specifies 2202 // internal or external linkage, the linkage of the identifier at 2203 // the later declaration is the same as the linkage specified at 2204 // the prior declaration. If no prior declaration is visible, or 2205 // if the prior declaration specifies no linkage, then the 2206 // identifier has external linkage. 2207 if (New->hasExternalStorage() && Old->hasLinkage()) 2208 /* Okay */; 2209 else if (New->getStorageClass() != SC_Static && 2210 Old->getStorageClass() == SC_Static) { 2211 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2212 Diag(Old->getLocation(), diag::note_previous_definition); 2213 return New->setInvalidDecl(); 2214 } 2215 2216 // Check if extern is followed by non-extern and vice-versa. 2217 if (New->hasExternalStorage() && 2218 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2219 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2220 Diag(Old->getLocation(), diag::note_previous_definition); 2221 return New->setInvalidDecl(); 2222 } 2223 if (Old->hasExternalStorage() && 2224 !New->hasLinkage() && New->isLocalVarDecl()) { 2225 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2226 Diag(Old->getLocation(), diag::note_previous_definition); 2227 return New->setInvalidDecl(); 2228 } 2229 2230 // __module_private__ is propagated to later declarations. 2231 if (Old->isModulePrivate()) 2232 New->setModulePrivate(); 2233 else if (New->isModulePrivate()) 2234 diagnoseModulePrivateRedeclaration(New, Old); 2235 2236 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2237 2238 // FIXME: The test for external storage here seems wrong? We still 2239 // need to check for mismatches. 2240 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2241 // Don't complain about out-of-line definitions of static members. 2242 !(Old->getLexicalDeclContext()->isRecord() && 2243 !New->getLexicalDeclContext()->isRecord())) { 2244 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2245 Diag(Old->getLocation(), diag::note_previous_definition); 2246 return New->setInvalidDecl(); 2247 } 2248 2249 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2250 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2251 Diag(Old->getLocation(), diag::note_previous_definition); 2252 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2253 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2254 Diag(Old->getLocation(), diag::note_previous_definition); 2255 } 2256 2257 // C++ doesn't have tentative definitions, so go right ahead and check here. 2258 const VarDecl *Def; 2259 if (getLangOptions().CPlusPlus && 2260 New->isThisDeclarationADefinition() == VarDecl::Definition && 2261 (Def = Old->getDefinition())) { 2262 Diag(New->getLocation(), diag::err_redefinition) 2263 << New->getDeclName(); 2264 Diag(Def->getLocation(), diag::note_previous_definition); 2265 New->setInvalidDecl(); 2266 return; 2267 } 2268 // c99 6.2.2 P4. 2269 // For an identifier declared with the storage-class specifier extern in a 2270 // scope in which a prior declaration of that identifier is visible, if 2271 // the prior declaration specifies internal or external linkage, the linkage 2272 // of the identifier at the later declaration is the same as the linkage 2273 // specified at the prior declaration. 2274 // FIXME. revisit this code. 2275 if (New->hasExternalStorage() && 2276 Old->getLinkage() == InternalLinkage && 2277 New->getDeclContext() == Old->getDeclContext()) 2278 New->setStorageClass(Old->getStorageClass()); 2279 2280 // Keep a chain of previous declarations. 2281 New->setPreviousDeclaration(Old); 2282 2283 // Inherit access appropriately. 2284 New->setAccess(Old->getAccess()); 2285} 2286 2287/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2288/// no declarator (e.g. "struct foo;") is parsed. 2289Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2290 DeclSpec &DS) { 2291 return ParsedFreeStandingDeclSpec(S, AS, DS, 2292 MultiTemplateParamsArg(*this, 0, 0)); 2293} 2294 2295/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2296/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2297/// parameters to cope with template friend declarations. 2298Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2299 DeclSpec &DS, 2300 MultiTemplateParamsArg TemplateParams) { 2301 Decl *TagD = 0; 2302 TagDecl *Tag = 0; 2303 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2304 DS.getTypeSpecType() == DeclSpec::TST_struct || 2305 DS.getTypeSpecType() == DeclSpec::TST_union || 2306 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2307 TagD = DS.getRepAsDecl(); 2308 2309 if (!TagD) // We probably had an error 2310 return 0; 2311 2312 // Note that the above type specs guarantee that the 2313 // type rep is a Decl, whereas in many of the others 2314 // it's a Type. 2315 Tag = dyn_cast<TagDecl>(TagD); 2316 } 2317 2318 if (Tag) 2319 Tag->setFreeStanding(); 2320 2321 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2322 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2323 // or incomplete types shall not be restrict-qualified." 2324 if (TypeQuals & DeclSpec::TQ_restrict) 2325 Diag(DS.getRestrictSpecLoc(), 2326 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2327 << DS.getSourceRange(); 2328 } 2329 2330 if (DS.isConstexprSpecified()) { 2331 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2332 // and definitions of functions and variables. 2333 if (Tag) 2334 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2335 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2336 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2337 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2338 else 2339 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2340 // Don't emit warnings after this error. 2341 return TagD; 2342 } 2343 2344 if (DS.isFriendSpecified()) { 2345 // If we're dealing with a decl but not a TagDecl, assume that 2346 // whatever routines created it handled the friendship aspect. 2347 if (TagD && !Tag) 2348 return 0; 2349 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2350 } 2351 2352 // Track whether we warned about the fact that there aren't any 2353 // declarators. 2354 bool emittedWarning = false; 2355 2356 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2357 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2358 2359 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2360 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2361 if (getLangOptions().CPlusPlus || 2362 Record->getDeclContext()->isRecord()) 2363 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2364 2365 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2366 << DS.getSourceRange(); 2367 emittedWarning = true; 2368 } 2369 } 2370 2371 // Check for Microsoft C extension: anonymous struct. 2372 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2373 CurContext->isRecord() && 2374 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2375 // Handle 2 kinds of anonymous struct: 2376 // struct STRUCT; 2377 // and 2378 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2379 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2380 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2381 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2382 DS.getRepAsType().get()->isStructureType())) { 2383 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2384 << DS.getSourceRange(); 2385 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2386 } 2387 } 2388 2389 if (getLangOptions().CPlusPlus && 2390 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2391 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2392 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2393 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2394 Diag(Enum->getLocation(), diag::ext_no_declarators) 2395 << DS.getSourceRange(); 2396 emittedWarning = true; 2397 } 2398 2399 // Skip all the checks below if we have a type error. 2400 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2401 2402 if (!DS.isMissingDeclaratorOk()) { 2403 // Warn about typedefs of enums without names, since this is an 2404 // extension in both Microsoft and GNU. 2405 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2406 Tag && isa<EnumDecl>(Tag)) { 2407 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2408 << DS.getSourceRange(); 2409 return Tag; 2410 } 2411 2412 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2413 << DS.getSourceRange(); 2414 emittedWarning = true; 2415 } 2416 2417 // We're going to complain about a bunch of spurious specifiers; 2418 // only do this if we're declaring a tag, because otherwise we 2419 // should be getting diag::ext_no_declarators. 2420 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2421 return TagD; 2422 2423 // Note that a linkage-specification sets a storage class, but 2424 // 'extern "C" struct foo;' is actually valid and not theoretically 2425 // useless. 2426 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2427 if (!DS.isExternInLinkageSpec()) 2428 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2429 << DeclSpec::getSpecifierName(scs); 2430 2431 if (DS.isThreadSpecified()) 2432 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2433 if (DS.getTypeQualifiers()) { 2434 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2435 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2436 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2437 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2438 // Restrict is covered above. 2439 } 2440 if (DS.isInlineSpecified()) 2441 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2442 if (DS.isVirtualSpecified()) 2443 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2444 if (DS.isExplicitSpecified()) 2445 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2446 2447 if (DS.isModulePrivateSpecified() && 2448 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2449 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2450 << Tag->getTagKind() 2451 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2452 2453 // FIXME: Warn on useless attributes 2454 2455 return TagD; 2456} 2457 2458/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2459/// builds a statement for it and returns it so it is evaluated. 2460StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2461 StmtResult R; 2462 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2463 Expr *Exp = DS.getRepAsExpr(); 2464 QualType Ty = Exp->getType(); 2465 if (Ty->isPointerType()) { 2466 do 2467 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2468 while (Ty->isPointerType()); 2469 } 2470 if (Ty->isVariableArrayType()) { 2471 R = ActOnExprStmt(MakeFullExpr(Exp)); 2472 } 2473 } 2474 return R; 2475} 2476 2477/// We are trying to inject an anonymous member into the given scope; 2478/// check if there's an existing declaration that can't be overloaded. 2479/// 2480/// \return true if this is a forbidden redeclaration 2481static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2482 Scope *S, 2483 DeclContext *Owner, 2484 DeclarationName Name, 2485 SourceLocation NameLoc, 2486 unsigned diagnostic) { 2487 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2488 Sema::ForRedeclaration); 2489 if (!SemaRef.LookupName(R, S)) return false; 2490 2491 if (R.getAsSingle<TagDecl>()) 2492 return false; 2493 2494 // Pick a representative declaration. 2495 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2496 assert(PrevDecl && "Expected a non-null Decl"); 2497 2498 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2499 return false; 2500 2501 SemaRef.Diag(NameLoc, diagnostic) << Name; 2502 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2503 2504 return true; 2505} 2506 2507/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2508/// anonymous struct or union AnonRecord into the owning context Owner 2509/// and scope S. This routine will be invoked just after we realize 2510/// that an unnamed union or struct is actually an anonymous union or 2511/// struct, e.g., 2512/// 2513/// @code 2514/// union { 2515/// int i; 2516/// float f; 2517/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2518/// // f into the surrounding scope.x 2519/// @endcode 2520/// 2521/// This routine is recursive, injecting the names of nested anonymous 2522/// structs/unions into the owning context and scope as well. 2523static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2524 DeclContext *Owner, 2525 RecordDecl *AnonRecord, 2526 AccessSpecifier AS, 2527 SmallVector<NamedDecl*, 2> &Chaining, 2528 bool MSAnonStruct) { 2529 unsigned diagKind 2530 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2531 : diag::err_anonymous_struct_member_redecl; 2532 2533 bool Invalid = false; 2534 2535 // Look every FieldDecl and IndirectFieldDecl with a name. 2536 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2537 DEnd = AnonRecord->decls_end(); 2538 D != DEnd; ++D) { 2539 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2540 cast<NamedDecl>(*D)->getDeclName()) { 2541 ValueDecl *VD = cast<ValueDecl>(*D); 2542 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2543 VD->getLocation(), diagKind)) { 2544 // C++ [class.union]p2: 2545 // The names of the members of an anonymous union shall be 2546 // distinct from the names of any other entity in the 2547 // scope in which the anonymous union is declared. 2548 Invalid = true; 2549 } else { 2550 // C++ [class.union]p2: 2551 // For the purpose of name lookup, after the anonymous union 2552 // definition, the members of the anonymous union are 2553 // considered to have been defined in the scope in which the 2554 // anonymous union is declared. 2555 unsigned OldChainingSize = Chaining.size(); 2556 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2557 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2558 PE = IF->chain_end(); PI != PE; ++PI) 2559 Chaining.push_back(*PI); 2560 else 2561 Chaining.push_back(VD); 2562 2563 assert(Chaining.size() >= 2); 2564 NamedDecl **NamedChain = 2565 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2566 for (unsigned i = 0; i < Chaining.size(); i++) 2567 NamedChain[i] = Chaining[i]; 2568 2569 IndirectFieldDecl* IndirectField = 2570 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2571 VD->getIdentifier(), VD->getType(), 2572 NamedChain, Chaining.size()); 2573 2574 IndirectField->setAccess(AS); 2575 IndirectField->setImplicit(); 2576 SemaRef.PushOnScopeChains(IndirectField, S); 2577 2578 // That includes picking up the appropriate access specifier. 2579 if (AS != AS_none) IndirectField->setAccess(AS); 2580 2581 Chaining.resize(OldChainingSize); 2582 } 2583 } 2584 } 2585 2586 return Invalid; 2587} 2588 2589/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2590/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2591/// illegal input values are mapped to SC_None. 2592static StorageClass 2593StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2594 switch (StorageClassSpec) { 2595 case DeclSpec::SCS_unspecified: return SC_None; 2596 case DeclSpec::SCS_extern: return SC_Extern; 2597 case DeclSpec::SCS_static: return SC_Static; 2598 case DeclSpec::SCS_auto: return SC_Auto; 2599 case DeclSpec::SCS_register: return SC_Register; 2600 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2601 // Illegal SCSs map to None: error reporting is up to the caller. 2602 case DeclSpec::SCS_mutable: // Fall through. 2603 case DeclSpec::SCS_typedef: return SC_None; 2604 } 2605 llvm_unreachable("unknown storage class specifier"); 2606} 2607 2608/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2609/// a StorageClass. Any error reporting is up to the caller: 2610/// illegal input values are mapped to SC_None. 2611static StorageClass 2612StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2613 switch (StorageClassSpec) { 2614 case DeclSpec::SCS_unspecified: return SC_None; 2615 case DeclSpec::SCS_extern: return SC_Extern; 2616 case DeclSpec::SCS_static: return SC_Static; 2617 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2618 // Illegal SCSs map to None: error reporting is up to the caller. 2619 case DeclSpec::SCS_auto: // Fall through. 2620 case DeclSpec::SCS_mutable: // Fall through. 2621 case DeclSpec::SCS_register: // Fall through. 2622 case DeclSpec::SCS_typedef: return SC_None; 2623 } 2624 llvm_unreachable("unknown storage class specifier"); 2625} 2626 2627/// BuildAnonymousStructOrUnion - Handle the declaration of an 2628/// anonymous structure or union. Anonymous unions are a C++ feature 2629/// (C++ [class.union]) and a GNU C extension; anonymous structures 2630/// are a GNU C and GNU C++ extension. 2631Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2632 AccessSpecifier AS, 2633 RecordDecl *Record) { 2634 DeclContext *Owner = Record->getDeclContext(); 2635 2636 // Diagnose whether this anonymous struct/union is an extension. 2637 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2638 Diag(Record->getLocation(), diag::ext_anonymous_union); 2639 else if (!Record->isUnion()) 2640 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2641 2642 // C and C++ require different kinds of checks for anonymous 2643 // structs/unions. 2644 bool Invalid = false; 2645 if (getLangOptions().CPlusPlus) { 2646 const char* PrevSpec = 0; 2647 unsigned DiagID; 2648 if (Record->isUnion()) { 2649 // C++ [class.union]p6: 2650 // Anonymous unions declared in a named namespace or in the 2651 // global namespace shall be declared static. 2652 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2653 (isa<TranslationUnitDecl>(Owner) || 2654 (isa<NamespaceDecl>(Owner) && 2655 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2656 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2657 Invalid = true; 2658 2659 // Recover by adding 'static'. 2660 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2661 PrevSpec, DiagID); 2662 } 2663 // C++ [class.union]p6: 2664 // A storage class is not allowed in a declaration of an 2665 // anonymous union in a class scope. 2666 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2667 isa<RecordDecl>(Owner)) { 2668 Diag(DS.getStorageClassSpecLoc(), 2669 diag::err_anonymous_union_with_storage_spec); 2670 Invalid = true; 2671 2672 // Recover by removing the storage specifier. 2673 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2674 SourceLocation(), 2675 PrevSpec, DiagID); 2676 } 2677 } 2678 2679 // Ignore const/volatile/restrict qualifiers. 2680 if (DS.getTypeQualifiers()) { 2681 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2682 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2683 << Record->isUnion() << 0 2684 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2685 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2686 Diag(DS.getVolatileSpecLoc(), 2687 diag::ext_anonymous_struct_union_qualified) 2688 << Record->isUnion() << 1 2689 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2690 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2691 Diag(DS.getRestrictSpecLoc(), 2692 diag::ext_anonymous_struct_union_qualified) 2693 << Record->isUnion() << 2 2694 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2695 2696 DS.ClearTypeQualifiers(); 2697 } 2698 2699 // C++ [class.union]p2: 2700 // The member-specification of an anonymous union shall only 2701 // define non-static data members. [Note: nested types and 2702 // functions cannot be declared within an anonymous union. ] 2703 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2704 MemEnd = Record->decls_end(); 2705 Mem != MemEnd; ++Mem) { 2706 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2707 // C++ [class.union]p3: 2708 // An anonymous union shall not have private or protected 2709 // members (clause 11). 2710 assert(FD->getAccess() != AS_none); 2711 if (FD->getAccess() != AS_public) { 2712 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2713 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2714 Invalid = true; 2715 } 2716 2717 // C++ [class.union]p1 2718 // An object of a class with a non-trivial constructor, a non-trivial 2719 // copy constructor, a non-trivial destructor, or a non-trivial copy 2720 // assignment operator cannot be a member of a union, nor can an 2721 // array of such objects. 2722 if (CheckNontrivialField(FD)) 2723 Invalid = true; 2724 } else if ((*Mem)->isImplicit()) { 2725 // Any implicit members are fine. 2726 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2727 // This is a type that showed up in an 2728 // elaborated-type-specifier inside the anonymous struct or 2729 // union, but which actually declares a type outside of the 2730 // anonymous struct or union. It's okay. 2731 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2732 if (!MemRecord->isAnonymousStructOrUnion() && 2733 MemRecord->getDeclName()) { 2734 // Visual C++ allows type definition in anonymous struct or union. 2735 if (getLangOptions().MicrosoftExt) 2736 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2737 << (int)Record->isUnion(); 2738 else { 2739 // This is a nested type declaration. 2740 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2741 << (int)Record->isUnion(); 2742 Invalid = true; 2743 } 2744 } 2745 } else if (isa<AccessSpecDecl>(*Mem)) { 2746 // Any access specifier is fine. 2747 } else { 2748 // We have something that isn't a non-static data 2749 // member. Complain about it. 2750 unsigned DK = diag::err_anonymous_record_bad_member; 2751 if (isa<TypeDecl>(*Mem)) 2752 DK = diag::err_anonymous_record_with_type; 2753 else if (isa<FunctionDecl>(*Mem)) 2754 DK = diag::err_anonymous_record_with_function; 2755 else if (isa<VarDecl>(*Mem)) 2756 DK = diag::err_anonymous_record_with_static; 2757 2758 // Visual C++ allows type definition in anonymous struct or union. 2759 if (getLangOptions().MicrosoftExt && 2760 DK == diag::err_anonymous_record_with_type) 2761 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2762 << (int)Record->isUnion(); 2763 else { 2764 Diag((*Mem)->getLocation(), DK) 2765 << (int)Record->isUnion(); 2766 Invalid = true; 2767 } 2768 } 2769 } 2770 } 2771 2772 if (!Record->isUnion() && !Owner->isRecord()) { 2773 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2774 << (int)getLangOptions().CPlusPlus; 2775 Invalid = true; 2776 } 2777 2778 // Mock up a declarator. 2779 Declarator Dc(DS, Declarator::MemberContext); 2780 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2781 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2782 2783 // Create a declaration for this anonymous struct/union. 2784 NamedDecl *Anon = 0; 2785 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2786 Anon = FieldDecl::Create(Context, OwningClass, 2787 DS.getSourceRange().getBegin(), 2788 Record->getLocation(), 2789 /*IdentifierInfo=*/0, 2790 Context.getTypeDeclType(Record), 2791 TInfo, 2792 /*BitWidth=*/0, /*Mutable=*/false, 2793 /*HasInit=*/false); 2794 Anon->setAccess(AS); 2795 if (getLangOptions().CPlusPlus) 2796 FieldCollector->Add(cast<FieldDecl>(Anon)); 2797 } else { 2798 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2799 assert(SCSpec != DeclSpec::SCS_typedef && 2800 "Parser allowed 'typedef' as storage class VarDecl."); 2801 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2802 if (SCSpec == DeclSpec::SCS_mutable) { 2803 // mutable can only appear on non-static class members, so it's always 2804 // an error here 2805 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2806 Invalid = true; 2807 SC = SC_None; 2808 } 2809 SCSpec = DS.getStorageClassSpecAsWritten(); 2810 VarDecl::StorageClass SCAsWritten 2811 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2812 2813 Anon = VarDecl::Create(Context, Owner, 2814 DS.getSourceRange().getBegin(), 2815 Record->getLocation(), /*IdentifierInfo=*/0, 2816 Context.getTypeDeclType(Record), 2817 TInfo, SC, SCAsWritten); 2818 2819 // Default-initialize the implicit variable. This initialization will be 2820 // trivial in almost all cases, except if a union member has an in-class 2821 // initializer: 2822 // union { int n = 0; }; 2823 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2824 } 2825 Anon->setImplicit(); 2826 2827 // Add the anonymous struct/union object to the current 2828 // context. We'll be referencing this object when we refer to one of 2829 // its members. 2830 Owner->addDecl(Anon); 2831 2832 // Inject the members of the anonymous struct/union into the owning 2833 // context and into the identifier resolver chain for name lookup 2834 // purposes. 2835 SmallVector<NamedDecl*, 2> Chain; 2836 Chain.push_back(Anon); 2837 2838 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2839 Chain, false)) 2840 Invalid = true; 2841 2842 // Mark this as an anonymous struct/union type. Note that we do not 2843 // do this until after we have already checked and injected the 2844 // members of this anonymous struct/union type, because otherwise 2845 // the members could be injected twice: once by DeclContext when it 2846 // builds its lookup table, and once by 2847 // InjectAnonymousStructOrUnionMembers. 2848 Record->setAnonymousStructOrUnion(true); 2849 2850 if (Invalid) 2851 Anon->setInvalidDecl(); 2852 2853 return Anon; 2854} 2855 2856/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2857/// Microsoft C anonymous structure. 2858/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2859/// Example: 2860/// 2861/// struct A { int a; }; 2862/// struct B { struct A; int b; }; 2863/// 2864/// void foo() { 2865/// B var; 2866/// var.a = 3; 2867/// } 2868/// 2869Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2870 RecordDecl *Record) { 2871 2872 // If there is no Record, get the record via the typedef. 2873 if (!Record) 2874 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2875 2876 // Mock up a declarator. 2877 Declarator Dc(DS, Declarator::TypeNameContext); 2878 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2879 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2880 2881 // Create a declaration for this anonymous struct. 2882 NamedDecl* Anon = FieldDecl::Create(Context, 2883 cast<RecordDecl>(CurContext), 2884 DS.getSourceRange().getBegin(), 2885 DS.getSourceRange().getBegin(), 2886 /*IdentifierInfo=*/0, 2887 Context.getTypeDeclType(Record), 2888 TInfo, 2889 /*BitWidth=*/0, /*Mutable=*/false, 2890 /*HasInit=*/false); 2891 Anon->setImplicit(); 2892 2893 // Add the anonymous struct object to the current context. 2894 CurContext->addDecl(Anon); 2895 2896 // Inject the members of the anonymous struct into the current 2897 // context and into the identifier resolver chain for name lookup 2898 // purposes. 2899 SmallVector<NamedDecl*, 2> Chain; 2900 Chain.push_back(Anon); 2901 2902 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2903 Record->getDefinition(), 2904 AS_none, Chain, true)) 2905 Anon->setInvalidDecl(); 2906 2907 return Anon; 2908} 2909 2910/// GetNameForDeclarator - Determine the full declaration name for the 2911/// given Declarator. 2912DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2913 return GetNameFromUnqualifiedId(D.getName()); 2914} 2915 2916/// \brief Retrieves the declaration name from a parsed unqualified-id. 2917DeclarationNameInfo 2918Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2919 DeclarationNameInfo NameInfo; 2920 NameInfo.setLoc(Name.StartLocation); 2921 2922 switch (Name.getKind()) { 2923 2924 case UnqualifiedId::IK_ImplicitSelfParam: 2925 case UnqualifiedId::IK_Identifier: 2926 NameInfo.setName(Name.Identifier); 2927 NameInfo.setLoc(Name.StartLocation); 2928 return NameInfo; 2929 2930 case UnqualifiedId::IK_OperatorFunctionId: 2931 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2932 Name.OperatorFunctionId.Operator)); 2933 NameInfo.setLoc(Name.StartLocation); 2934 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2935 = Name.OperatorFunctionId.SymbolLocations[0]; 2936 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2937 = Name.EndLocation.getRawEncoding(); 2938 return NameInfo; 2939 2940 case UnqualifiedId::IK_LiteralOperatorId: 2941 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2942 Name.Identifier)); 2943 NameInfo.setLoc(Name.StartLocation); 2944 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2945 return NameInfo; 2946 2947 case UnqualifiedId::IK_ConversionFunctionId: { 2948 TypeSourceInfo *TInfo; 2949 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2950 if (Ty.isNull()) 2951 return DeclarationNameInfo(); 2952 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2953 Context.getCanonicalType(Ty))); 2954 NameInfo.setLoc(Name.StartLocation); 2955 NameInfo.setNamedTypeInfo(TInfo); 2956 return NameInfo; 2957 } 2958 2959 case UnqualifiedId::IK_ConstructorName: { 2960 TypeSourceInfo *TInfo; 2961 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2962 if (Ty.isNull()) 2963 return DeclarationNameInfo(); 2964 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2965 Context.getCanonicalType(Ty))); 2966 NameInfo.setLoc(Name.StartLocation); 2967 NameInfo.setNamedTypeInfo(TInfo); 2968 return NameInfo; 2969 } 2970 2971 case UnqualifiedId::IK_ConstructorTemplateId: { 2972 // In well-formed code, we can only have a constructor 2973 // template-id that refers to the current context, so go there 2974 // to find the actual type being constructed. 2975 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2976 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2977 return DeclarationNameInfo(); 2978 2979 // Determine the type of the class being constructed. 2980 QualType CurClassType = Context.getTypeDeclType(CurClass); 2981 2982 // FIXME: Check two things: that the template-id names the same type as 2983 // CurClassType, and that the template-id does not occur when the name 2984 // was qualified. 2985 2986 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2987 Context.getCanonicalType(CurClassType))); 2988 NameInfo.setLoc(Name.StartLocation); 2989 // FIXME: should we retrieve TypeSourceInfo? 2990 NameInfo.setNamedTypeInfo(0); 2991 return NameInfo; 2992 } 2993 2994 case UnqualifiedId::IK_DestructorName: { 2995 TypeSourceInfo *TInfo; 2996 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2997 if (Ty.isNull()) 2998 return DeclarationNameInfo(); 2999 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3000 Context.getCanonicalType(Ty))); 3001 NameInfo.setLoc(Name.StartLocation); 3002 NameInfo.setNamedTypeInfo(TInfo); 3003 return NameInfo; 3004 } 3005 3006 case UnqualifiedId::IK_TemplateId: { 3007 TemplateName TName = Name.TemplateId->Template.get(); 3008 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3009 return Context.getNameForTemplate(TName, TNameLoc); 3010 } 3011 3012 } // switch (Name.getKind()) 3013 3014 llvm_unreachable("Unknown name kind"); 3015} 3016 3017static QualType getCoreType(QualType Ty) { 3018 do { 3019 if (Ty->isPointerType() || Ty->isReferenceType()) 3020 Ty = Ty->getPointeeType(); 3021 else if (Ty->isArrayType()) 3022 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3023 else 3024 return Ty.withoutLocalFastQualifiers(); 3025 } while (true); 3026} 3027 3028/// hasSimilarParameters - Determine whether the C++ functions Declaration 3029/// and Definition have "nearly" matching parameters. This heuristic is 3030/// used to improve diagnostics in the case where an out-of-line function 3031/// definition doesn't match any declaration within the class or namespace. 3032/// Also sets Params to the list of indices to the parameters that differ 3033/// between the declaration and the definition. If hasSimilarParameters 3034/// returns true and Params is empty, then all of the parameters match. 3035static bool hasSimilarParameters(ASTContext &Context, 3036 FunctionDecl *Declaration, 3037 FunctionDecl *Definition, 3038 llvm::SmallVectorImpl<unsigned> &Params) { 3039 Params.clear(); 3040 if (Declaration->param_size() != Definition->param_size()) 3041 return false; 3042 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3043 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3044 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3045 3046 // The parameter types are identical 3047 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3048 continue; 3049 3050 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3051 QualType DefParamBaseTy = getCoreType(DefParamTy); 3052 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3053 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3054 3055 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3056 (DeclTyName && DeclTyName == DefTyName)) 3057 Params.push_back(Idx); 3058 else // The two parameters aren't even close 3059 return false; 3060 } 3061 3062 return true; 3063} 3064 3065/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3066/// declarator needs to be rebuilt in the current instantiation. 3067/// Any bits of declarator which appear before the name are valid for 3068/// consideration here. That's specifically the type in the decl spec 3069/// and the base type in any member-pointer chunks. 3070static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3071 DeclarationName Name) { 3072 // The types we specifically need to rebuild are: 3073 // - typenames, typeofs, and decltypes 3074 // - types which will become injected class names 3075 // Of course, we also need to rebuild any type referencing such a 3076 // type. It's safest to just say "dependent", but we call out a 3077 // few cases here. 3078 3079 DeclSpec &DS = D.getMutableDeclSpec(); 3080 switch (DS.getTypeSpecType()) { 3081 case DeclSpec::TST_typename: 3082 case DeclSpec::TST_typeofType: 3083 case DeclSpec::TST_decltype: 3084 case DeclSpec::TST_underlyingType: 3085 case DeclSpec::TST_atomic: { 3086 // Grab the type from the parser. 3087 TypeSourceInfo *TSI = 0; 3088 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3089 if (T.isNull() || !T->isDependentType()) break; 3090 3091 // Make sure there's a type source info. This isn't really much 3092 // of a waste; most dependent types should have type source info 3093 // attached already. 3094 if (!TSI) 3095 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3096 3097 // Rebuild the type in the current instantiation. 3098 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3099 if (!TSI) return true; 3100 3101 // Store the new type back in the decl spec. 3102 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3103 DS.UpdateTypeRep(LocType); 3104 break; 3105 } 3106 3107 case DeclSpec::TST_typeofExpr: { 3108 Expr *E = DS.getRepAsExpr(); 3109 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3110 if (Result.isInvalid()) return true; 3111 DS.UpdateExprRep(Result.get()); 3112 break; 3113 } 3114 3115 default: 3116 // Nothing to do for these decl specs. 3117 break; 3118 } 3119 3120 // It doesn't matter what order we do this in. 3121 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3122 DeclaratorChunk &Chunk = D.getTypeObject(I); 3123 3124 // The only type information in the declarator which can come 3125 // before the declaration name is the base type of a member 3126 // pointer. 3127 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3128 continue; 3129 3130 // Rebuild the scope specifier in-place. 3131 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3132 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3133 return true; 3134 } 3135 3136 return false; 3137} 3138 3139Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3140 D.setFunctionDefinition(false); 3141 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3142} 3143 3144/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3145/// If T is the name of a class, then each of the following shall have a 3146/// name different from T: 3147/// - every static data member of class T; 3148/// - every member function of class T 3149/// - every member of class T that is itself a type; 3150/// \returns true if the declaration name violates these rules. 3151bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3152 DeclarationNameInfo NameInfo) { 3153 DeclarationName Name = NameInfo.getName(); 3154 3155 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3156 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3157 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3158 return true; 3159 } 3160 3161 return false; 3162} 3163 3164Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3165 MultiTemplateParamsArg TemplateParamLists) { 3166 // TODO: consider using NameInfo for diagnostic. 3167 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3168 DeclarationName Name = NameInfo.getName(); 3169 3170 // All of these full declarators require an identifier. If it doesn't have 3171 // one, the ParsedFreeStandingDeclSpec action should be used. 3172 if (!Name) { 3173 if (!D.isInvalidType()) // Reject this if we think it is valid. 3174 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3175 diag::err_declarator_need_ident) 3176 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3177 return 0; 3178 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3179 return 0; 3180 3181 // The scope passed in may not be a decl scope. Zip up the scope tree until 3182 // we find one that is. 3183 while ((S->getFlags() & Scope::DeclScope) == 0 || 3184 (S->getFlags() & Scope::TemplateParamScope) != 0) 3185 S = S->getParent(); 3186 3187 DeclContext *DC = CurContext; 3188 if (D.getCXXScopeSpec().isInvalid()) 3189 D.setInvalidType(); 3190 else if (D.getCXXScopeSpec().isSet()) { 3191 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3192 UPPC_DeclarationQualifier)) 3193 return 0; 3194 3195 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3196 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3197 if (!DC) { 3198 // If we could not compute the declaration context, it's because the 3199 // declaration context is dependent but does not refer to a class, 3200 // class template, or class template partial specialization. Complain 3201 // and return early, to avoid the coming semantic disaster. 3202 Diag(D.getIdentifierLoc(), 3203 diag::err_template_qualified_declarator_no_match) 3204 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3205 << D.getCXXScopeSpec().getRange(); 3206 return 0; 3207 } 3208 bool IsDependentContext = DC->isDependentContext(); 3209 3210 if (!IsDependentContext && 3211 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3212 return 0; 3213 3214 if (isa<CXXRecordDecl>(DC)) { 3215 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3216 Diag(D.getIdentifierLoc(), 3217 diag::err_member_def_undefined_record) 3218 << Name << DC << D.getCXXScopeSpec().getRange(); 3219 D.setInvalidType(); 3220 } else if (isa<CXXRecordDecl>(CurContext) && 3221 !D.getDeclSpec().isFriendSpecified()) { 3222 // The user provided a superfluous scope specifier inside a class 3223 // definition: 3224 // 3225 // class X { 3226 // void X::f(); 3227 // }; 3228 if (CurContext->Equals(DC)) 3229 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3230 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3231 else 3232 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3233 << Name << D.getCXXScopeSpec().getRange(); 3234 3235 // Pretend that this qualifier was not here. 3236 D.getCXXScopeSpec().clear(); 3237 } 3238 } 3239 3240 // Check whether we need to rebuild the type of the given 3241 // declaration in the current instantiation. 3242 if (EnteringContext && IsDependentContext && 3243 TemplateParamLists.size() != 0) { 3244 ContextRAII SavedContext(*this, DC); 3245 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3246 D.setInvalidType(); 3247 } 3248 } 3249 3250 if (DiagnoseClassNameShadow(DC, NameInfo)) 3251 // If this is a typedef, we'll end up spewing multiple diagnostics. 3252 // Just return early; it's safer. 3253 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3254 return 0; 3255 3256 NamedDecl *New; 3257 3258 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3259 QualType R = TInfo->getType(); 3260 3261 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3262 UPPC_DeclarationType)) 3263 D.setInvalidType(); 3264 3265 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3266 ForRedeclaration); 3267 3268 // See if this is a redefinition of a variable in the same scope. 3269 if (!D.getCXXScopeSpec().isSet()) { 3270 bool IsLinkageLookup = false; 3271 3272 // If the declaration we're planning to build will be a function 3273 // or object with linkage, then look for another declaration with 3274 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3275 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3276 /* Do nothing*/; 3277 else if (R->isFunctionType()) { 3278 if (CurContext->isFunctionOrMethod() || 3279 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3280 IsLinkageLookup = true; 3281 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3282 IsLinkageLookup = true; 3283 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3284 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3285 IsLinkageLookup = true; 3286 3287 if (IsLinkageLookup) 3288 Previous.clear(LookupRedeclarationWithLinkage); 3289 3290 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3291 } else { // Something like "int foo::x;" 3292 LookupQualifiedName(Previous, DC); 3293 3294 // Don't consider using declarations as previous declarations for 3295 // out-of-line members. 3296 RemoveUsingDecls(Previous); 3297 3298 // C++ 7.3.1.2p2: 3299 // Members (including explicit specializations of templates) of a named 3300 // namespace can also be defined outside that namespace by explicit 3301 // qualification of the name being defined, provided that the entity being 3302 // defined was already declared in the namespace and the definition appears 3303 // after the point of declaration in a namespace that encloses the 3304 // declarations namespace. 3305 // 3306 // Note that we only check the context at this point. We don't yet 3307 // have enough information to make sure that PrevDecl is actually 3308 // the declaration we want to match. For example, given: 3309 // 3310 // class X { 3311 // void f(); 3312 // void f(float); 3313 // }; 3314 // 3315 // void X::f(int) { } // ill-formed 3316 // 3317 // In this case, PrevDecl will point to the overload set 3318 // containing the two f's declared in X, but neither of them 3319 // matches. 3320 3321 // First check whether we named the global scope. 3322 if (isa<TranslationUnitDecl>(DC)) { 3323 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3324 << Name << D.getCXXScopeSpec().getRange(); 3325 } else { 3326 DeclContext *Cur = CurContext; 3327 while (isa<LinkageSpecDecl>(Cur)) 3328 Cur = Cur->getParent(); 3329 if (!Cur->Encloses(DC)) { 3330 // The qualifying scope doesn't enclose the original declaration. 3331 // Emit diagnostic based on current scope. 3332 SourceLocation L = D.getIdentifierLoc(); 3333 SourceRange R = D.getCXXScopeSpec().getRange(); 3334 if (isa<FunctionDecl>(Cur)) 3335 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3336 else 3337 Diag(L, diag::err_invalid_declarator_scope) 3338 << Name << cast<NamedDecl>(DC) << R; 3339 D.setInvalidType(); 3340 } 3341 } 3342 } 3343 3344 if (Previous.isSingleResult() && 3345 Previous.getFoundDecl()->isTemplateParameter()) { 3346 // Maybe we will complain about the shadowed template parameter. 3347 if (!D.isInvalidType()) 3348 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3349 Previous.getFoundDecl())) 3350 D.setInvalidType(); 3351 3352 // Just pretend that we didn't see the previous declaration. 3353 Previous.clear(); 3354 } 3355 3356 // In C++, the previous declaration we find might be a tag type 3357 // (class or enum). In this case, the new declaration will hide the 3358 // tag type. Note that this does does not apply if we're declaring a 3359 // typedef (C++ [dcl.typedef]p4). 3360 if (Previous.isSingleTagDecl() && 3361 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3362 Previous.clear(); 3363 3364 bool AddToScope = true; 3365 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3366 if (TemplateParamLists.size()) { 3367 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3368 return 0; 3369 } 3370 3371 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3372 } else if (R->isFunctionType()) { 3373 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3374 move(TemplateParamLists), 3375 AddToScope); 3376 } else { 3377 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3378 move(TemplateParamLists)); 3379 } 3380 3381 if (New == 0) 3382 return 0; 3383 3384 // If this has an identifier and is not an invalid redeclaration or 3385 // function template specialization, add it to the scope stack. 3386 if (New->getDeclName() && AddToScope && 3387 !(D.isRedeclaration() && New->isInvalidDecl())) 3388 PushOnScopeChains(New, S); 3389 3390 return New; 3391} 3392 3393/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3394/// types into constant array types in certain situations which would otherwise 3395/// be errors (for GCC compatibility). 3396static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3397 ASTContext &Context, 3398 bool &SizeIsNegative, 3399 llvm::APSInt &Oversized) { 3400 // This method tries to turn a variable array into a constant 3401 // array even when the size isn't an ICE. This is necessary 3402 // for compatibility with code that depends on gcc's buggy 3403 // constant expression folding, like struct {char x[(int)(char*)2];} 3404 SizeIsNegative = false; 3405 Oversized = 0; 3406 3407 if (T->isDependentType()) 3408 return QualType(); 3409 3410 QualifierCollector Qs; 3411 const Type *Ty = Qs.strip(T); 3412 3413 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3414 QualType Pointee = PTy->getPointeeType(); 3415 QualType FixedType = 3416 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3417 Oversized); 3418 if (FixedType.isNull()) return FixedType; 3419 FixedType = Context.getPointerType(FixedType); 3420 return Qs.apply(Context, FixedType); 3421 } 3422 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3423 QualType Inner = PTy->getInnerType(); 3424 QualType FixedType = 3425 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3426 Oversized); 3427 if (FixedType.isNull()) return FixedType; 3428 FixedType = Context.getParenType(FixedType); 3429 return Qs.apply(Context, FixedType); 3430 } 3431 3432 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3433 if (!VLATy) 3434 return QualType(); 3435 // FIXME: We should probably handle this case 3436 if (VLATy->getElementType()->isVariablyModifiedType()) 3437 return QualType(); 3438 3439 Expr::EvalResult EvalResult; 3440 if (!VLATy->getSizeExpr() || 3441 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3442 !EvalResult.Val.isInt()) 3443 return QualType(); 3444 3445 // Check whether the array size is negative. 3446 llvm::APSInt &Res = EvalResult.Val.getInt(); 3447 if (Res.isSigned() && Res.isNegative()) { 3448 SizeIsNegative = true; 3449 return QualType(); 3450 } 3451 3452 // Check whether the array is too large to be addressed. 3453 unsigned ActiveSizeBits 3454 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3455 Res); 3456 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3457 Oversized = Res; 3458 return QualType(); 3459 } 3460 3461 return Context.getConstantArrayType(VLATy->getElementType(), 3462 Res, ArrayType::Normal, 0); 3463} 3464 3465/// \brief Register the given locally-scoped external C declaration so 3466/// that it can be found later for redeclarations 3467void 3468Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3469 const LookupResult &Previous, 3470 Scope *S) { 3471 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3472 "Decl is not a locally-scoped decl!"); 3473 // Note that we have a locally-scoped external with this name. 3474 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3475 3476 if (!Previous.isSingleResult()) 3477 return; 3478 3479 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3480 3481 // If there was a previous declaration of this variable, it may be 3482 // in our identifier chain. Update the identifier chain with the new 3483 // declaration. 3484 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3485 // The previous declaration was found on the identifer resolver 3486 // chain, so remove it from its scope. 3487 3488 if (S->isDeclScope(PrevDecl)) { 3489 // Special case for redeclarations in the SAME scope. 3490 // Because this declaration is going to be added to the identifier chain 3491 // later, we should temporarily take it OFF the chain. 3492 IdResolver.RemoveDecl(ND); 3493 3494 } else { 3495 // Find the scope for the original declaration. 3496 while (S && !S->isDeclScope(PrevDecl)) 3497 S = S->getParent(); 3498 } 3499 3500 if (S) 3501 S->RemoveDecl(PrevDecl); 3502 } 3503} 3504 3505llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3506Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3507 if (ExternalSource) { 3508 // Load locally-scoped external decls from the external source. 3509 SmallVector<NamedDecl *, 4> Decls; 3510 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3511 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3512 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3513 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3514 if (Pos == LocallyScopedExternalDecls.end()) 3515 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3516 } 3517 } 3518 3519 return LocallyScopedExternalDecls.find(Name); 3520} 3521 3522/// \brief Diagnose function specifiers on a declaration of an identifier that 3523/// does not identify a function. 3524void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3525 // FIXME: We should probably indicate the identifier in question to avoid 3526 // confusion for constructs like "inline int a(), b;" 3527 if (D.getDeclSpec().isInlineSpecified()) 3528 Diag(D.getDeclSpec().getInlineSpecLoc(), 3529 diag::err_inline_non_function); 3530 3531 if (D.getDeclSpec().isVirtualSpecified()) 3532 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3533 diag::err_virtual_non_function); 3534 3535 if (D.getDeclSpec().isExplicitSpecified()) 3536 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3537 diag::err_explicit_non_function); 3538} 3539 3540NamedDecl* 3541Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3542 TypeSourceInfo *TInfo, LookupResult &Previous) { 3543 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3544 if (D.getCXXScopeSpec().isSet()) { 3545 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3546 << D.getCXXScopeSpec().getRange(); 3547 D.setInvalidType(); 3548 // Pretend we didn't see the scope specifier. 3549 DC = CurContext; 3550 Previous.clear(); 3551 } 3552 3553 if (getLangOptions().CPlusPlus) { 3554 // Check that there are no default arguments (C++ only). 3555 CheckExtraCXXDefaultArguments(D); 3556 } 3557 3558 DiagnoseFunctionSpecifiers(D); 3559 3560 if (D.getDeclSpec().isThreadSpecified()) 3561 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3562 if (D.getDeclSpec().isConstexprSpecified()) 3563 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3564 << 1; 3565 3566 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3567 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3568 << D.getName().getSourceRange(); 3569 return 0; 3570 } 3571 3572 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3573 if (!NewTD) return 0; 3574 3575 // Handle attributes prior to checking for duplicates in MergeVarDecl 3576 ProcessDeclAttributes(S, NewTD, D); 3577 3578 CheckTypedefForVariablyModifiedType(S, NewTD); 3579 3580 bool Redeclaration = D.isRedeclaration(); 3581 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3582 D.setRedeclaration(Redeclaration); 3583 return ND; 3584} 3585 3586void 3587Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3588 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3589 // then it shall have block scope. 3590 // Note that variably modified types must be fixed before merging the decl so 3591 // that redeclarations will match. 3592 QualType T = NewTD->getUnderlyingType(); 3593 if (T->isVariablyModifiedType()) { 3594 getCurFunction()->setHasBranchProtectedScope(); 3595 3596 if (S->getFnParent() == 0) { 3597 bool SizeIsNegative; 3598 llvm::APSInt Oversized; 3599 QualType FixedTy = 3600 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3601 Oversized); 3602 if (!FixedTy.isNull()) { 3603 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3604 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3605 } else { 3606 if (SizeIsNegative) 3607 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3608 else if (T->isVariableArrayType()) 3609 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3610 else if (Oversized.getBoolValue()) 3611 Diag(NewTD->getLocation(), diag::err_array_too_large) 3612 << Oversized.toString(10); 3613 else 3614 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3615 NewTD->setInvalidDecl(); 3616 } 3617 } 3618 } 3619} 3620 3621 3622/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3623/// declares a typedef-name, either using the 'typedef' type specifier or via 3624/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3625NamedDecl* 3626Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3627 LookupResult &Previous, bool &Redeclaration) { 3628 // Merge the decl with the existing one if appropriate. If the decl is 3629 // in an outer scope, it isn't the same thing. 3630 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3631 /*ExplicitInstantiationOrSpecialization=*/false); 3632 if (!Previous.empty()) { 3633 Redeclaration = true; 3634 MergeTypedefNameDecl(NewTD, Previous); 3635 } 3636 3637 // If this is the C FILE type, notify the AST context. 3638 if (IdentifierInfo *II = NewTD->getIdentifier()) 3639 if (!NewTD->isInvalidDecl() && 3640 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3641 if (II->isStr("FILE")) 3642 Context.setFILEDecl(NewTD); 3643 else if (II->isStr("jmp_buf")) 3644 Context.setjmp_bufDecl(NewTD); 3645 else if (II->isStr("sigjmp_buf")) 3646 Context.setsigjmp_bufDecl(NewTD); 3647 else if (II->isStr("__builtin_va_list")) 3648 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3649 } 3650 3651 return NewTD; 3652} 3653 3654/// \brief Determines whether the given declaration is an out-of-scope 3655/// previous declaration. 3656/// 3657/// This routine should be invoked when name lookup has found a 3658/// previous declaration (PrevDecl) that is not in the scope where a 3659/// new declaration by the same name is being introduced. If the new 3660/// declaration occurs in a local scope, previous declarations with 3661/// linkage may still be considered previous declarations (C99 3662/// 6.2.2p4-5, C++ [basic.link]p6). 3663/// 3664/// \param PrevDecl the previous declaration found by name 3665/// lookup 3666/// 3667/// \param DC the context in which the new declaration is being 3668/// declared. 3669/// 3670/// \returns true if PrevDecl is an out-of-scope previous declaration 3671/// for a new delcaration with the same name. 3672static bool 3673isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3674 ASTContext &Context) { 3675 if (!PrevDecl) 3676 return false; 3677 3678 if (!PrevDecl->hasLinkage()) 3679 return false; 3680 3681 if (Context.getLangOptions().CPlusPlus) { 3682 // C++ [basic.link]p6: 3683 // If there is a visible declaration of an entity with linkage 3684 // having the same name and type, ignoring entities declared 3685 // outside the innermost enclosing namespace scope, the block 3686 // scope declaration declares that same entity and receives the 3687 // linkage of the previous declaration. 3688 DeclContext *OuterContext = DC->getRedeclContext(); 3689 if (!OuterContext->isFunctionOrMethod()) 3690 // This rule only applies to block-scope declarations. 3691 return false; 3692 3693 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3694 if (PrevOuterContext->isRecord()) 3695 // We found a member function: ignore it. 3696 return false; 3697 3698 // Find the innermost enclosing namespace for the new and 3699 // previous declarations. 3700 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3701 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3702 3703 // The previous declaration is in a different namespace, so it 3704 // isn't the same function. 3705 if (!OuterContext->Equals(PrevOuterContext)) 3706 return false; 3707 } 3708 3709 return true; 3710} 3711 3712static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3713 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3714 if (!SS.isSet()) return; 3715 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3716} 3717 3718bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3719 QualType type = decl->getType(); 3720 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3721 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3722 // Various kinds of declaration aren't allowed to be __autoreleasing. 3723 unsigned kind = -1U; 3724 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3725 if (var->hasAttr<BlocksAttr>()) 3726 kind = 0; // __block 3727 else if (!var->hasLocalStorage()) 3728 kind = 1; // global 3729 } else if (isa<ObjCIvarDecl>(decl)) { 3730 kind = 3; // ivar 3731 } else if (isa<FieldDecl>(decl)) { 3732 kind = 2; // field 3733 } 3734 3735 if (kind != -1U) { 3736 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3737 << kind; 3738 } 3739 } else if (lifetime == Qualifiers::OCL_None) { 3740 // Try to infer lifetime. 3741 if (!type->isObjCLifetimeType()) 3742 return false; 3743 3744 lifetime = type->getObjCARCImplicitLifetime(); 3745 type = Context.getLifetimeQualifiedType(type, lifetime); 3746 decl->setType(type); 3747 } 3748 3749 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3750 // Thread-local variables cannot have lifetime. 3751 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3752 var->isThreadSpecified()) { 3753 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3754 << var->getType(); 3755 return true; 3756 } 3757 } 3758 3759 return false; 3760} 3761 3762NamedDecl* 3763Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3764 TypeSourceInfo *TInfo, LookupResult &Previous, 3765 MultiTemplateParamsArg TemplateParamLists) { 3766 QualType R = TInfo->getType(); 3767 DeclarationName Name = GetNameForDeclarator(D).getName(); 3768 3769 // Check that there are no default arguments (C++ only). 3770 if (getLangOptions().CPlusPlus) 3771 CheckExtraCXXDefaultArguments(D); 3772 3773 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3774 assert(SCSpec != DeclSpec::SCS_typedef && 3775 "Parser allowed 'typedef' as storage class VarDecl."); 3776 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3777 if (SCSpec == DeclSpec::SCS_mutable) { 3778 // mutable can only appear on non-static class members, so it's always 3779 // an error here 3780 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3781 D.setInvalidType(); 3782 SC = SC_None; 3783 } 3784 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3785 VarDecl::StorageClass SCAsWritten 3786 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3787 3788 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3789 if (!II) { 3790 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3791 << Name; 3792 return 0; 3793 } 3794 3795 DiagnoseFunctionSpecifiers(D); 3796 3797 if (!DC->isRecord() && S->getFnParent() == 0) { 3798 // C99 6.9p2: The storage-class specifiers auto and register shall not 3799 // appear in the declaration specifiers in an external declaration. 3800 if (SC == SC_Auto || SC == SC_Register) { 3801 3802 // If this is a register variable with an asm label specified, then this 3803 // is a GNU extension. 3804 if (SC == SC_Register && D.getAsmLabel()) 3805 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3806 else 3807 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3808 D.setInvalidType(); 3809 } 3810 } 3811 3812 if (getLangOptions().OpenCL) { 3813 // Set up the special work-group-local storage class for variables in the 3814 // OpenCL __local address space. 3815 if (R.getAddressSpace() == LangAS::opencl_local) 3816 SC = SC_OpenCLWorkGroupLocal; 3817 } 3818 3819 bool isExplicitSpecialization = false; 3820 VarDecl *NewVD; 3821 if (!getLangOptions().CPlusPlus) { 3822 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3823 D.getIdentifierLoc(), II, 3824 R, TInfo, SC, SCAsWritten); 3825 3826 if (D.isInvalidType()) 3827 NewVD->setInvalidDecl(); 3828 } else { 3829 if (DC->isRecord() && !CurContext->isRecord()) { 3830 // This is an out-of-line definition of a static data member. 3831 if (SC == SC_Static) { 3832 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3833 diag::err_static_out_of_line) 3834 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3835 } else if (SC == SC_None) 3836 SC = SC_Static; 3837 } 3838 if (SC == SC_Static) { 3839 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3840 if (RD->isLocalClass()) 3841 Diag(D.getIdentifierLoc(), 3842 diag::err_static_data_member_not_allowed_in_local_class) 3843 << Name << RD->getDeclName(); 3844 3845 // C++ [class.union]p1: If a union contains a static data member, 3846 // the program is ill-formed. 3847 // 3848 // We also disallow static data members in anonymous structs. 3849 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3850 Diag(D.getIdentifierLoc(), 3851 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3852 << Name << RD->isUnion(); 3853 } 3854 } 3855 3856 // Match up the template parameter lists with the scope specifier, then 3857 // determine whether we have a template or a template specialization. 3858 isExplicitSpecialization = false; 3859 bool Invalid = false; 3860 if (TemplateParameterList *TemplateParams 3861 = MatchTemplateParametersToScopeSpecifier( 3862 D.getDeclSpec().getSourceRange().getBegin(), 3863 D.getIdentifierLoc(), 3864 D.getCXXScopeSpec(), 3865 TemplateParamLists.get(), 3866 TemplateParamLists.size(), 3867 /*never a friend*/ false, 3868 isExplicitSpecialization, 3869 Invalid)) { 3870 if (TemplateParams->size() > 0) { 3871 // There is no such thing as a variable template. 3872 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3873 << II 3874 << SourceRange(TemplateParams->getTemplateLoc(), 3875 TemplateParams->getRAngleLoc()); 3876 return 0; 3877 } else { 3878 // There is an extraneous 'template<>' for this variable. Complain 3879 // about it, but allow the declaration of the variable. 3880 Diag(TemplateParams->getTemplateLoc(), 3881 diag::err_template_variable_noparams) 3882 << II 3883 << SourceRange(TemplateParams->getTemplateLoc(), 3884 TemplateParams->getRAngleLoc()); 3885 } 3886 } 3887 3888 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3889 D.getIdentifierLoc(), II, 3890 R, TInfo, SC, SCAsWritten); 3891 3892 // If this decl has an auto type in need of deduction, make a note of the 3893 // Decl so we can diagnose uses of it in its own initializer. 3894 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3895 R->getContainedAutoType()) 3896 ParsingInitForAutoVars.insert(NewVD); 3897 3898 if (D.isInvalidType() || Invalid) 3899 NewVD->setInvalidDecl(); 3900 3901 SetNestedNameSpecifier(NewVD, D); 3902 3903 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3904 NewVD->setTemplateParameterListsInfo(Context, 3905 TemplateParamLists.size(), 3906 TemplateParamLists.release()); 3907 } 3908 3909 if (D.getDeclSpec().isConstexprSpecified()) { 3910 // FIXME: once we know whether there's an initializer, apply this to 3911 // static data members too. 3912 if (!NewVD->isStaticDataMember() && 3913 !NewVD->isThisDeclarationADefinition()) { 3914 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3915 // of a variable. Suggest replacing it with 'const' if appropriate. 3916 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3917 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3918 // If the declarator is complex, we need to move the keyword to the 3919 // innermost chunk as we switch it from 'constexpr' to 'const'. 3920 int Kind = DeclaratorChunk::Paren; 3921 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3922 Kind = D.getTypeObject(I).Kind; 3923 if (Kind != DeclaratorChunk::Paren) 3924 break; 3925 } 3926 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3927 Kind == DeclaratorChunk::Reference) 3928 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3929 << FixItHint::CreateRemoval(ConstexprRange); 3930 else if (Kind == DeclaratorChunk::Paren) 3931 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3932 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3933 else 3934 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3935 << FixItHint::CreateRemoval(ConstexprRange) 3936 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3937 } else { 3938 NewVD->setConstexpr(true); 3939 } 3940 } 3941 } 3942 3943 // Set the lexical context. If the declarator has a C++ scope specifier, the 3944 // lexical context will be different from the semantic context. 3945 NewVD->setLexicalDeclContext(CurContext); 3946 3947 if (D.getDeclSpec().isThreadSpecified()) { 3948 if (NewVD->hasLocalStorage()) 3949 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3950 else if (!Context.getTargetInfo().isTLSSupported()) 3951 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3952 else 3953 NewVD->setThreadSpecified(true); 3954 } 3955 3956 if (D.getDeclSpec().isModulePrivateSpecified()) { 3957 if (isExplicitSpecialization) 3958 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3959 << 2 3960 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3961 else if (NewVD->hasLocalStorage()) 3962 Diag(NewVD->getLocation(), diag::err_module_private_local) 3963 << 0 << NewVD->getDeclName() 3964 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3965 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3966 else 3967 NewVD->setModulePrivate(); 3968 } 3969 3970 // Handle attributes prior to checking for duplicates in MergeVarDecl 3971 ProcessDeclAttributes(S, NewVD, D); 3972 3973 // In auto-retain/release, infer strong retension for variables of 3974 // retainable type. 3975 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3976 NewVD->setInvalidDecl(); 3977 3978 // Handle GNU asm-label extension (encoded as an attribute). 3979 if (Expr *E = (Expr*)D.getAsmLabel()) { 3980 // The parser guarantees this is a string. 3981 StringLiteral *SE = cast<StringLiteral>(E); 3982 StringRef Label = SE->getString(); 3983 if (S->getFnParent() != 0) { 3984 switch (SC) { 3985 case SC_None: 3986 case SC_Auto: 3987 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3988 break; 3989 case SC_Register: 3990 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3991 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3992 break; 3993 case SC_Static: 3994 case SC_Extern: 3995 case SC_PrivateExtern: 3996 case SC_OpenCLWorkGroupLocal: 3997 break; 3998 } 3999 } 4000 4001 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4002 Context, Label)); 4003 } 4004 4005 // Diagnose shadowed variables before filtering for scope. 4006 if (!D.getCXXScopeSpec().isSet()) 4007 CheckShadow(S, NewVD, Previous); 4008 4009 // Don't consider existing declarations that are in a different 4010 // scope and are out-of-semantic-context declarations (if the new 4011 // declaration has linkage). 4012 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4013 isExplicitSpecialization); 4014 4015 if (!getLangOptions().CPlusPlus) { 4016 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4017 } else { 4018 // Merge the decl with the existing one if appropriate. 4019 if (!Previous.empty()) { 4020 if (Previous.isSingleResult() && 4021 isa<FieldDecl>(Previous.getFoundDecl()) && 4022 D.getCXXScopeSpec().isSet()) { 4023 // The user tried to define a non-static data member 4024 // out-of-line (C++ [dcl.meaning]p1). 4025 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4026 << D.getCXXScopeSpec().getRange(); 4027 Previous.clear(); 4028 NewVD->setInvalidDecl(); 4029 } 4030 } else if (D.getCXXScopeSpec().isSet()) { 4031 // No previous declaration in the qualifying scope. 4032 Diag(D.getIdentifierLoc(), diag::err_no_member) 4033 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4034 << D.getCXXScopeSpec().getRange(); 4035 NewVD->setInvalidDecl(); 4036 } 4037 4038 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4039 4040 // This is an explicit specialization of a static data member. Check it. 4041 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4042 CheckMemberSpecialization(NewVD, Previous)) 4043 NewVD->setInvalidDecl(); 4044 } 4045 4046 // attributes declared post-definition are currently ignored 4047 // FIXME: This should be handled in attribute merging, not 4048 // here. 4049 if (Previous.isSingleResult()) { 4050 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4051 if (Def && (Def = Def->getDefinition()) && 4052 Def != NewVD && D.hasAttributes()) { 4053 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4054 Diag(Def->getLocation(), diag::note_previous_definition); 4055 } 4056 } 4057 4058 // If this is a locally-scoped extern C variable, update the map of 4059 // such variables. 4060 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4061 !NewVD->isInvalidDecl()) 4062 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4063 4064 // If there's a #pragma GCC visibility in scope, and this isn't a class 4065 // member, set the visibility of this variable. 4066 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4067 AddPushedVisibilityAttribute(NewVD); 4068 4069 MarkUnusedFileScopedDecl(NewVD); 4070 4071 return NewVD; 4072} 4073 4074/// \brief Diagnose variable or built-in function shadowing. Implements 4075/// -Wshadow. 4076/// 4077/// This method is called whenever a VarDecl is added to a "useful" 4078/// scope. 4079/// 4080/// \param S the scope in which the shadowing name is being declared 4081/// \param R the lookup of the name 4082/// 4083void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4084 // Return if warning is ignored. 4085 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4086 DiagnosticsEngine::Ignored) 4087 return; 4088 4089 // Don't diagnose declarations at file scope. 4090 if (D->hasGlobalStorage()) 4091 return; 4092 4093 DeclContext *NewDC = D->getDeclContext(); 4094 4095 // Only diagnose if we're shadowing an unambiguous field or variable. 4096 if (R.getResultKind() != LookupResult::Found) 4097 return; 4098 4099 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4100 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4101 return; 4102 4103 // Fields are not shadowed by variables in C++ static methods. 4104 if (isa<FieldDecl>(ShadowedDecl)) 4105 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4106 if (MD->isStatic()) 4107 return; 4108 4109 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4110 if (shadowedVar->isExternC()) { 4111 // For shadowing external vars, make sure that we point to the global 4112 // declaration, not a locally scoped extern declaration. 4113 for (VarDecl::redecl_iterator 4114 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4115 I != E; ++I) 4116 if (I->isFileVarDecl()) { 4117 ShadowedDecl = *I; 4118 break; 4119 } 4120 } 4121 4122 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4123 4124 // Only warn about certain kinds of shadowing for class members. 4125 if (NewDC && NewDC->isRecord()) { 4126 // In particular, don't warn about shadowing non-class members. 4127 if (!OldDC->isRecord()) 4128 return; 4129 4130 // TODO: should we warn about static data members shadowing 4131 // static data members from base classes? 4132 4133 // TODO: don't diagnose for inaccessible shadowed members. 4134 // This is hard to do perfectly because we might friend the 4135 // shadowing context, but that's just a false negative. 4136 } 4137 4138 // Determine what kind of declaration we're shadowing. 4139 unsigned Kind; 4140 if (isa<RecordDecl>(OldDC)) { 4141 if (isa<FieldDecl>(ShadowedDecl)) 4142 Kind = 3; // field 4143 else 4144 Kind = 2; // static data member 4145 } else if (OldDC->isFileContext()) 4146 Kind = 1; // global 4147 else 4148 Kind = 0; // local 4149 4150 DeclarationName Name = R.getLookupName(); 4151 4152 // Emit warning and note. 4153 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4154 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4155} 4156 4157/// \brief Check -Wshadow without the advantage of a previous lookup. 4158void Sema::CheckShadow(Scope *S, VarDecl *D) { 4159 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4160 DiagnosticsEngine::Ignored) 4161 return; 4162 4163 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4164 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4165 LookupName(R, S); 4166 CheckShadow(S, D, R); 4167} 4168 4169/// \brief Perform semantic checking on a newly-created variable 4170/// declaration. 4171/// 4172/// This routine performs all of the type-checking required for a 4173/// variable declaration once it has been built. It is used both to 4174/// check variables after they have been parsed and their declarators 4175/// have been translated into a declaration, and to check variables 4176/// that have been instantiated from a template. 4177/// 4178/// Sets NewVD->isInvalidDecl() if an error was encountered. 4179/// 4180/// Returns true if the variable declaration is a redeclaration. 4181bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4182 LookupResult &Previous) { 4183 // If the decl is already known invalid, don't check it. 4184 if (NewVD->isInvalidDecl()) 4185 return false; 4186 4187 QualType T = NewVD->getType(); 4188 4189 if (T->isObjCObjectType()) { 4190 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4191 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4192 T = Context.getObjCObjectPointerType(T); 4193 NewVD->setType(T); 4194 } 4195 4196 // Emit an error if an address space was applied to decl with local storage. 4197 // This includes arrays of objects with address space qualifiers, but not 4198 // automatic variables that point to other address spaces. 4199 // ISO/IEC TR 18037 S5.1.2 4200 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4201 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4202 NewVD->setInvalidDecl(); 4203 return false; 4204 } 4205 4206 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4207 && !NewVD->hasAttr<BlocksAttr>()) { 4208 if (getLangOptions().getGC() != LangOptions::NonGC) 4209 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4210 else 4211 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4212 } 4213 4214 bool isVM = T->isVariablyModifiedType(); 4215 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4216 NewVD->hasAttr<BlocksAttr>()) 4217 getCurFunction()->setHasBranchProtectedScope(); 4218 4219 if ((isVM && NewVD->hasLinkage()) || 4220 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4221 bool SizeIsNegative; 4222 llvm::APSInt Oversized; 4223 QualType FixedTy = 4224 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4225 Oversized); 4226 4227 if (FixedTy.isNull() && T->isVariableArrayType()) { 4228 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4229 // FIXME: This won't give the correct result for 4230 // int a[10][n]; 4231 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4232 4233 if (NewVD->isFileVarDecl()) 4234 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4235 << SizeRange; 4236 else if (NewVD->getStorageClass() == SC_Static) 4237 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4238 << SizeRange; 4239 else 4240 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4241 << SizeRange; 4242 NewVD->setInvalidDecl(); 4243 return false; 4244 } 4245 4246 if (FixedTy.isNull()) { 4247 if (NewVD->isFileVarDecl()) 4248 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4249 else 4250 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4251 NewVD->setInvalidDecl(); 4252 return false; 4253 } 4254 4255 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4256 NewVD->setType(FixedTy); 4257 } 4258 4259 if (Previous.empty() && NewVD->isExternC()) { 4260 // Since we did not find anything by this name and we're declaring 4261 // an extern "C" variable, look for a non-visible extern "C" 4262 // declaration with the same name. 4263 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4264 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4265 if (Pos != LocallyScopedExternalDecls.end()) 4266 Previous.addDecl(Pos->second); 4267 } 4268 4269 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4270 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4271 << T; 4272 NewVD->setInvalidDecl(); 4273 return false; 4274 } 4275 4276 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4277 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4278 NewVD->setInvalidDecl(); 4279 return false; 4280 } 4281 4282 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4283 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4284 NewVD->setInvalidDecl(); 4285 return false; 4286 } 4287 4288 // Function pointers and references cannot have qualified function type, only 4289 // function pointer-to-members can do that. 4290 QualType Pointee; 4291 unsigned PtrOrRef = 0; 4292 if (const PointerType *Ptr = T->getAs<PointerType>()) 4293 Pointee = Ptr->getPointeeType(); 4294 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4295 Pointee = Ref->getPointeeType(); 4296 PtrOrRef = 1; 4297 } 4298 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4299 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4300 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4301 << PtrOrRef; 4302 NewVD->setInvalidDecl(); 4303 return false; 4304 } 4305 4306 if (!Previous.empty()) { 4307 MergeVarDecl(NewVD, Previous); 4308 return true; 4309 } 4310 return false; 4311} 4312 4313/// \brief Data used with FindOverriddenMethod 4314struct FindOverriddenMethodData { 4315 Sema *S; 4316 CXXMethodDecl *Method; 4317}; 4318 4319/// \brief Member lookup function that determines whether a given C++ 4320/// method overrides a method in a base class, to be used with 4321/// CXXRecordDecl::lookupInBases(). 4322static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4323 CXXBasePath &Path, 4324 void *UserData) { 4325 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4326 4327 FindOverriddenMethodData *Data 4328 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4329 4330 DeclarationName Name = Data->Method->getDeclName(); 4331 4332 // FIXME: Do we care about other names here too? 4333 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4334 // We really want to find the base class destructor here. 4335 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4336 CanQualType CT = Data->S->Context.getCanonicalType(T); 4337 4338 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4339 } 4340 4341 for (Path.Decls = BaseRecord->lookup(Name); 4342 Path.Decls.first != Path.Decls.second; 4343 ++Path.Decls.first) { 4344 NamedDecl *D = *Path.Decls.first; 4345 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4346 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4347 return true; 4348 } 4349 } 4350 4351 return false; 4352} 4353 4354/// AddOverriddenMethods - See if a method overrides any in the base classes, 4355/// and if so, check that it's a valid override and remember it. 4356bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4357 // Look for virtual methods in base classes that this method might override. 4358 CXXBasePaths Paths; 4359 FindOverriddenMethodData Data; 4360 Data.Method = MD; 4361 Data.S = this; 4362 bool AddedAny = false; 4363 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4364 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4365 E = Paths.found_decls_end(); I != E; ++I) { 4366 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4367 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4368 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4369 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4370 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4371 AddedAny = true; 4372 } 4373 } 4374 } 4375 } 4376 4377 return AddedAny; 4378} 4379 4380namespace { 4381 // Struct for holding all of the extra arguments needed by 4382 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4383 struct ActOnFDArgs { 4384 Scope *S; 4385 Declarator &D; 4386 MultiTemplateParamsArg TemplateParamLists; 4387 bool AddToScope; 4388 }; 4389} 4390 4391/// \brief Generate diagnostics for an invalid function redeclaration. 4392/// 4393/// This routine handles generating the diagnostic messages for an invalid 4394/// function redeclaration, including finding possible similar declarations 4395/// or performing typo correction if there are no previous declarations with 4396/// the same name. 4397/// 4398/// Returns a NamedDecl iff typo correction was performed and substituting in 4399/// the new declaration name does not cause new errors. 4400static NamedDecl* DiagnoseInvalidRedeclaration( 4401 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4402 ActOnFDArgs &ExtraArgs) { 4403 NamedDecl *Result = NULL; 4404 DeclarationName Name = NewFD->getDeclName(); 4405 DeclContext *NewDC = NewFD->getDeclContext(); 4406 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4407 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4408 llvm::SmallVector<unsigned, 1> MismatchedParams; 4409 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4410 TypoCorrection Correction; 4411 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4412 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4413 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4414 : diag::err_member_def_does_not_match; 4415 4416 NewFD->setInvalidDecl(); 4417 SemaRef.LookupQualifiedName(Prev, NewDC); 4418 assert(!Prev.isAmbiguous() && 4419 "Cannot have an ambiguity in previous-declaration lookup"); 4420 if (!Prev.empty()) { 4421 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4422 Func != FuncEnd; ++Func) { 4423 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4424 if (FD && 4425 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4426 // Add 1 to the index so that 0 can mean the mismatch didn't 4427 // involve a parameter 4428 unsigned ParamNum = 4429 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4430 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4431 } 4432 } 4433 // If the qualified name lookup yielded nothing, try typo correction 4434 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4435 Prev.getLookupKind(), 0, 0, NewDC)) && 4436 Correction.getCorrection() != Name) { 4437 // Trap errors. 4438 Sema::SFINAETrap Trap(SemaRef); 4439 4440 // Set up everything for the call to ActOnFunctionDeclarator 4441 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4442 ExtraArgs.D.getIdentifierLoc()); 4443 Previous.clear(); 4444 Previous.setLookupName(Correction.getCorrection()); 4445 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4446 CDeclEnd = Correction.end(); 4447 CDecl != CDeclEnd; ++CDecl) { 4448 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4449 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4450 MismatchedParams)) { 4451 Previous.addDecl(FD); 4452 } 4453 } 4454 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4455 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4456 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4457 // eliminate the need for the parameter pack ExtraArgs. 4458 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4459 NewFD->getDeclContext(), 4460 NewFD->getTypeSourceInfo(), 4461 Previous, 4462 ExtraArgs.TemplateParamLists, 4463 ExtraArgs.AddToScope); 4464 if (Trap.hasErrorOccurred()) { 4465 // Pretend the typo correction never occurred 4466 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4467 ExtraArgs.D.getIdentifierLoc()); 4468 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4469 Previous.clear(); 4470 Previous.setLookupName(Name); 4471 Result = NULL; 4472 } else { 4473 for (LookupResult::iterator Func = Previous.begin(), 4474 FuncEnd = Previous.end(); 4475 Func != FuncEnd; ++Func) { 4476 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4477 NearMatches.push_back(std::make_pair(FD, 0)); 4478 } 4479 } 4480 if (NearMatches.empty()) { 4481 // Ignore the correction if it didn't yield any close FunctionDecl matches 4482 Correction = TypoCorrection(); 4483 } else { 4484 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4485 : diag::err_member_def_does_not_match_suggest; 4486 } 4487 } 4488 4489 if (Correction) 4490 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4491 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4492 << FixItHint::CreateReplacement( 4493 NewFD->getLocation(), 4494 Correction.getAsString(SemaRef.getLangOptions())); 4495 else 4496 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4497 << Name << NewDC << NewFD->getLocation(); 4498 4499 bool NewFDisConst = false; 4500 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4501 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4502 4503 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4504 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4505 NearMatch != NearMatchEnd; ++NearMatch) { 4506 FunctionDecl *FD = NearMatch->first; 4507 bool FDisConst = false; 4508 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4509 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4510 4511 if (unsigned Idx = NearMatch->second) { 4512 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4513 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4514 diag::note_member_def_close_param_match) 4515 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4516 } else if (Correction) { 4517 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4518 << Correction.getQuoted(SemaRef.getLangOptions()); 4519 } else if (FDisConst != NewFDisConst) { 4520 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4521 << NewFDisConst << FD->getSourceRange().getEnd(); 4522 } else 4523 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4524 } 4525 return Result; 4526} 4527 4528static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4529 Declarator &D) { 4530 switch (D.getDeclSpec().getStorageClassSpec()) { 4531 default: llvm_unreachable("Unknown storage class!"); 4532 case DeclSpec::SCS_auto: 4533 case DeclSpec::SCS_register: 4534 case DeclSpec::SCS_mutable: 4535 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4536 diag::err_typecheck_sclass_func); 4537 D.setInvalidType(); 4538 break; 4539 case DeclSpec::SCS_unspecified: break; 4540 case DeclSpec::SCS_extern: return SC_Extern; 4541 case DeclSpec::SCS_static: { 4542 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4543 // C99 6.7.1p5: 4544 // The declaration of an identifier for a function that has 4545 // block scope shall have no explicit storage-class specifier 4546 // other than extern 4547 // See also (C++ [dcl.stc]p4). 4548 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4549 diag::err_static_block_func); 4550 break; 4551 } else 4552 return SC_Static; 4553 } 4554 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4555 } 4556 4557 // No explicit storage class has already been returned 4558 return SC_None; 4559} 4560 4561static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4562 DeclContext *DC, QualType &R, 4563 TypeSourceInfo *TInfo, 4564 FunctionDecl::StorageClass SC, 4565 bool &IsVirtualOkay) { 4566 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4567 DeclarationName Name = NameInfo.getName(); 4568 4569 FunctionDecl *NewFD = 0; 4570 bool isInline = D.getDeclSpec().isInlineSpecified(); 4571 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4572 FunctionDecl::StorageClass SCAsWritten 4573 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4574 4575 if (!SemaRef.getLangOptions().CPlusPlus) { 4576 // Determine whether the function was written with a 4577 // prototype. This true when: 4578 // - there is a prototype in the declarator, or 4579 // - the type R of the function is some kind of typedef or other reference 4580 // to a type name (which eventually refers to a function type). 4581 bool HasPrototype = 4582 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4583 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4584 4585 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4586 D.getSourceRange().getBegin(), NameInfo, R, 4587 TInfo, SC, SCAsWritten, isInline, 4588 HasPrototype); 4589 if (D.isInvalidType()) 4590 NewFD->setInvalidDecl(); 4591 4592 // Set the lexical context. 4593 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4594 4595 return NewFD; 4596 } 4597 4598 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4599 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4600 4601 // Check that the return type is not an abstract class type. 4602 // For record types, this is done by the AbstractClassUsageDiagnoser once 4603 // the class has been completely parsed. 4604 if (!DC->isRecord() && 4605 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4606 R->getAs<FunctionType>()->getResultType(), 4607 diag::err_abstract_type_in_decl, 4608 SemaRef.AbstractReturnType)) 4609 D.setInvalidType(); 4610 4611 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4612 // This is a C++ constructor declaration. 4613 assert(DC->isRecord() && 4614 "Constructors can only be declared in a member context"); 4615 4616 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4617 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4618 D.getSourceRange().getBegin(), NameInfo, 4619 R, TInfo, isExplicit, isInline, 4620 /*isImplicitlyDeclared=*/false, 4621 isConstexpr); 4622 4623 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4624 // This is a C++ destructor declaration. 4625 if (DC->isRecord()) { 4626 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4627 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4628 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4629 SemaRef.Context, Record, 4630 D.getSourceRange().getBegin(), 4631 NameInfo, R, TInfo, isInline, 4632 /*isImplicitlyDeclared=*/false); 4633 4634 // If the class is complete, then we now create the implicit exception 4635 // specification. If the class is incomplete or dependent, we can't do 4636 // it yet. 4637 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4638 Record->getDefinition() && !Record->isBeingDefined() && 4639 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4640 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4641 } 4642 4643 IsVirtualOkay = true; 4644 return NewDD; 4645 4646 } else { 4647 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4648 D.setInvalidType(); 4649 4650 // Create a FunctionDecl to satisfy the function definition parsing 4651 // code path. 4652 return FunctionDecl::Create(SemaRef.Context, DC, 4653 D.getSourceRange().getBegin(), 4654 D.getIdentifierLoc(), Name, R, TInfo, 4655 SC, SCAsWritten, isInline, 4656 /*hasPrototype=*/true, isConstexpr); 4657 } 4658 4659 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4660 if (!DC->isRecord()) { 4661 SemaRef.Diag(D.getIdentifierLoc(), 4662 diag::err_conv_function_not_member); 4663 return 0; 4664 } 4665 4666 SemaRef.CheckConversionDeclarator(D, R, SC); 4667 IsVirtualOkay = true; 4668 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4669 D.getSourceRange().getBegin(), NameInfo, 4670 R, TInfo, isInline, isExplicit, 4671 isConstexpr, SourceLocation()); 4672 4673 } else if (DC->isRecord()) { 4674 // If the name of the function is the same as the name of the record, 4675 // then this must be an invalid constructor that has a return type. 4676 // (The parser checks for a return type and makes the declarator a 4677 // constructor if it has no return type). 4678 if (Name.getAsIdentifierInfo() && 4679 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4680 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4681 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4682 << SourceRange(D.getIdentifierLoc()); 4683 return 0; 4684 } 4685 4686 bool isStatic = SC == SC_Static; 4687 4688 // [class.free]p1: 4689 // Any allocation function for a class T is a static member 4690 // (even if not explicitly declared static). 4691 if (Name.getCXXOverloadedOperator() == OO_New || 4692 Name.getCXXOverloadedOperator() == OO_Array_New) 4693 isStatic = true; 4694 4695 // [class.free]p6 Any deallocation function for a class X is a static member 4696 // (even if not explicitly declared static). 4697 if (Name.getCXXOverloadedOperator() == OO_Delete || 4698 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4699 isStatic = true; 4700 4701 IsVirtualOkay = !isStatic; 4702 4703 // This is a C++ method declaration. 4704 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4705 D.getSourceRange().getBegin(), NameInfo, R, 4706 TInfo, isStatic, SCAsWritten, isInline, 4707 isConstexpr, SourceLocation()); 4708 4709 } else { 4710 // Determine whether the function was written with a 4711 // prototype. This true when: 4712 // - we're in C++ (where every function has a prototype), 4713 return FunctionDecl::Create(SemaRef.Context, DC, 4714 D.getSourceRange().getBegin(), 4715 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4716 true/*HasPrototype*/, isConstexpr); 4717 } 4718} 4719 4720NamedDecl* 4721Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4722 TypeSourceInfo *TInfo, LookupResult &Previous, 4723 MultiTemplateParamsArg TemplateParamLists, 4724 bool &AddToScope) { 4725 QualType R = TInfo->getType(); 4726 4727 assert(R.getTypePtr()->isFunctionType()); 4728 4729 // TODO: consider using NameInfo for diagnostic. 4730 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4731 DeclarationName Name = NameInfo.getName(); 4732 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4733 4734 if (D.getDeclSpec().isThreadSpecified()) 4735 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4736 4737 // Do not allow returning a objc interface by-value. 4738 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4739 Diag(D.getIdentifierLoc(), 4740 diag::err_object_cannot_be_passed_returned_by_value) << 0 4741 << R->getAs<FunctionType>()->getResultType() 4742 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4743 4744 QualType T = R->getAs<FunctionType>()->getResultType(); 4745 T = Context.getObjCObjectPointerType(T); 4746 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4747 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4748 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4749 FPT->getNumArgs(), EPI); 4750 } 4751 else if (isa<FunctionNoProtoType>(R)) 4752 R = Context.getFunctionNoProtoType(T); 4753 } 4754 4755 bool isFriend = false; 4756 FunctionTemplateDecl *FunctionTemplate = 0; 4757 bool isExplicitSpecialization = false; 4758 bool isFunctionTemplateSpecialization = false; 4759 bool isDependentClassScopeExplicitSpecialization = false; 4760 bool isVirtualOkay = false; 4761 4762 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4763 isVirtualOkay); 4764 if (!NewFD) return 0; 4765 4766 if (getLangOptions().CPlusPlus) { 4767 bool isInline = D.getDeclSpec().isInlineSpecified(); 4768 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4769 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4770 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4771 isFriend = D.getDeclSpec().isFriendSpecified(); 4772 if (isFriend && !isInline && D.isFunctionDefinition()) { 4773 // C++ [class.friend]p5 4774 // A function can be defined in a friend declaration of a 4775 // class . . . . Such a function is implicitly inline. 4776 NewFD->setImplicitlyInline(); 4777 } 4778 4779 SetNestedNameSpecifier(NewFD, D); 4780 isExplicitSpecialization = false; 4781 isFunctionTemplateSpecialization = false; 4782 if (D.isInvalidType()) 4783 NewFD->setInvalidDecl(); 4784 4785 // Set the lexical context. If the declarator has a C++ 4786 // scope specifier, or is the object of a friend declaration, the 4787 // lexical context will be different from the semantic context. 4788 NewFD->setLexicalDeclContext(CurContext); 4789 4790 // Match up the template parameter lists with the scope specifier, then 4791 // determine whether we have a template or a template specialization. 4792 bool Invalid = false; 4793 if (TemplateParameterList *TemplateParams 4794 = MatchTemplateParametersToScopeSpecifier( 4795 D.getDeclSpec().getSourceRange().getBegin(), 4796 D.getIdentifierLoc(), 4797 D.getCXXScopeSpec(), 4798 TemplateParamLists.get(), 4799 TemplateParamLists.size(), 4800 isFriend, 4801 isExplicitSpecialization, 4802 Invalid)) { 4803 if (TemplateParams->size() > 0) { 4804 // This is a function template 4805 4806 // Check that we can declare a template here. 4807 if (CheckTemplateDeclScope(S, TemplateParams)) 4808 return 0; 4809 4810 // A destructor cannot be a template. 4811 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4812 Diag(NewFD->getLocation(), diag::err_destructor_template); 4813 return 0; 4814 } 4815 4816 // If we're adding a template to a dependent context, we may need to 4817 // rebuilding some of the types used within the template parameter list, 4818 // now that we know what the current instantiation is. 4819 if (DC->isDependentContext()) { 4820 ContextRAII SavedContext(*this, DC); 4821 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4822 Invalid = true; 4823 } 4824 4825 4826 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4827 NewFD->getLocation(), 4828 Name, TemplateParams, 4829 NewFD); 4830 FunctionTemplate->setLexicalDeclContext(CurContext); 4831 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4832 4833 // For source fidelity, store the other template param lists. 4834 if (TemplateParamLists.size() > 1) { 4835 NewFD->setTemplateParameterListsInfo(Context, 4836 TemplateParamLists.size() - 1, 4837 TemplateParamLists.release()); 4838 } 4839 } else { 4840 // This is a function template specialization. 4841 isFunctionTemplateSpecialization = true; 4842 // For source fidelity, store all the template param lists. 4843 NewFD->setTemplateParameterListsInfo(Context, 4844 TemplateParamLists.size(), 4845 TemplateParamLists.release()); 4846 4847 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4848 if (isFriend) { 4849 // We want to remove the "template<>", found here. 4850 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4851 4852 // If we remove the template<> and the name is not a 4853 // template-id, we're actually silently creating a problem: 4854 // the friend declaration will refer to an untemplated decl, 4855 // and clearly the user wants a template specialization. So 4856 // we need to insert '<>' after the name. 4857 SourceLocation InsertLoc; 4858 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4859 InsertLoc = D.getName().getSourceRange().getEnd(); 4860 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4861 } 4862 4863 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4864 << Name << RemoveRange 4865 << FixItHint::CreateRemoval(RemoveRange) 4866 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4867 } 4868 } 4869 } 4870 else { 4871 // All template param lists were matched against the scope specifier: 4872 // this is NOT (an explicit specialization of) a template. 4873 if (TemplateParamLists.size() > 0) 4874 // For source fidelity, store all the template param lists. 4875 NewFD->setTemplateParameterListsInfo(Context, 4876 TemplateParamLists.size(), 4877 TemplateParamLists.release()); 4878 } 4879 4880 if (Invalid) { 4881 NewFD->setInvalidDecl(); 4882 if (FunctionTemplate) 4883 FunctionTemplate->setInvalidDecl(); 4884 } 4885 4886 // C++ [dcl.fct.spec]p5: 4887 // The virtual specifier shall only be used in declarations of 4888 // nonstatic class member functions that appear within a 4889 // member-specification of a class declaration; see 10.3. 4890 // 4891 if (isVirtual && !NewFD->isInvalidDecl()) { 4892 if (!isVirtualOkay) { 4893 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4894 diag::err_virtual_non_function); 4895 } else if (!CurContext->isRecord()) { 4896 // 'virtual' was specified outside of the class. 4897 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4898 diag::err_virtual_out_of_class) 4899 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4900 } else if (NewFD->getDescribedFunctionTemplate()) { 4901 // C++ [temp.mem]p3: 4902 // A member function template shall not be virtual. 4903 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4904 diag::err_virtual_member_function_template) 4905 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4906 } else { 4907 // Okay: Add virtual to the method. 4908 NewFD->setVirtualAsWritten(true); 4909 } 4910 } 4911 4912 // C++ [dcl.fct.spec]p3: 4913 // The inline specifier shall not appear on a block scope function 4914 // declaration. 4915 if (isInline && !NewFD->isInvalidDecl()) { 4916 if (CurContext->isFunctionOrMethod()) { 4917 // 'inline' is not allowed on block scope function declaration. 4918 Diag(D.getDeclSpec().getInlineSpecLoc(), 4919 diag::err_inline_declaration_block_scope) << Name 4920 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4921 } 4922 } 4923 4924 // C++ [dcl.fct.spec]p6: 4925 // The explicit specifier shall be used only in the declaration of a 4926 // constructor or conversion function within its class definition; 4927 // see 12.3.1 and 12.3.2. 4928 if (isExplicit && !NewFD->isInvalidDecl()) { 4929 if (!CurContext->isRecord()) { 4930 // 'explicit' was specified outside of the class. 4931 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4932 diag::err_explicit_out_of_class) 4933 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4934 } else if (!isa<CXXConstructorDecl>(NewFD) && 4935 !isa<CXXConversionDecl>(NewFD)) { 4936 // 'explicit' was specified on a function that wasn't a constructor 4937 // or conversion function. 4938 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4939 diag::err_explicit_non_ctor_or_conv_function) 4940 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4941 } 4942 } 4943 4944 if (isConstexpr) { 4945 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4946 // are implicitly inline. 4947 NewFD->setImplicitlyInline(); 4948 4949 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4950 // be either constructors or to return a literal type. Therefore, 4951 // destructors cannot be declared constexpr. 4952 if (isa<CXXDestructorDecl>(NewFD)) 4953 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4954 } 4955 4956 // If __module_private__ was specified, mark the function accordingly. 4957 if (D.getDeclSpec().isModulePrivateSpecified()) { 4958 if (isFunctionTemplateSpecialization) { 4959 SourceLocation ModulePrivateLoc 4960 = D.getDeclSpec().getModulePrivateSpecLoc(); 4961 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4962 << 0 4963 << FixItHint::CreateRemoval(ModulePrivateLoc); 4964 } else { 4965 NewFD->setModulePrivate(); 4966 if (FunctionTemplate) 4967 FunctionTemplate->setModulePrivate(); 4968 } 4969 } 4970 4971 if (isFriend) { 4972 // For now, claim that the objects have no previous declaration. 4973 if (FunctionTemplate) { 4974 FunctionTemplate->setObjectOfFriendDecl(false); 4975 FunctionTemplate->setAccess(AS_public); 4976 } 4977 NewFD->setObjectOfFriendDecl(false); 4978 NewFD->setAccess(AS_public); 4979 } 4980 4981 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4982 D.isFunctionDefinition()) { 4983 // A method is implicitly inline if it's defined in its class 4984 // definition. 4985 NewFD->setImplicitlyInline(); 4986 } 4987 4988 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4989 !CurContext->isRecord()) { 4990 // C++ [class.static]p1: 4991 // A data or function member of a class may be declared static 4992 // in a class definition, in which case it is a static member of 4993 // the class. 4994 4995 // Complain about the 'static' specifier if it's on an out-of-line 4996 // member function definition. 4997 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4998 diag::err_static_out_of_line) 4999 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5000 } 5001 } 5002 5003 // Filter out previous declarations that don't match the scope. 5004 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5005 isExplicitSpecialization || 5006 isFunctionTemplateSpecialization); 5007 5008 // Handle GNU asm-label extension (encoded as an attribute). 5009 if (Expr *E = (Expr*) D.getAsmLabel()) { 5010 // The parser guarantees this is a string. 5011 StringLiteral *SE = cast<StringLiteral>(E); 5012 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5013 SE->getString())); 5014 } 5015 5016 // Copy the parameter declarations from the declarator D to the function 5017 // declaration NewFD, if they are available. First scavenge them into Params. 5018 SmallVector<ParmVarDecl*, 16> Params; 5019 if (D.isFunctionDeclarator()) { 5020 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5021 5022 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5023 // function that takes no arguments, not a function that takes a 5024 // single void argument. 5025 // We let through "const void" here because Sema::GetTypeForDeclarator 5026 // already checks for that case. 5027 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5028 FTI.ArgInfo[0].Param && 5029 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5030 // Empty arg list, don't push any params. 5031 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5032 5033 // In C++, the empty parameter-type-list must be spelled "void"; a 5034 // typedef of void is not permitted. 5035 if (getLangOptions().CPlusPlus && 5036 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5037 bool IsTypeAlias = false; 5038 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5039 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5040 else if (const TemplateSpecializationType *TST = 5041 Param->getType()->getAs<TemplateSpecializationType>()) 5042 IsTypeAlias = TST->isTypeAlias(); 5043 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5044 << IsTypeAlias; 5045 } 5046 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5047 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5048 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5049 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5050 Param->setDeclContext(NewFD); 5051 Params.push_back(Param); 5052 5053 if (Param->isInvalidDecl()) 5054 NewFD->setInvalidDecl(); 5055 } 5056 } 5057 5058 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5059 // When we're declaring a function with a typedef, typeof, etc as in the 5060 // following example, we'll need to synthesize (unnamed) 5061 // parameters for use in the declaration. 5062 // 5063 // @code 5064 // typedef void fn(int); 5065 // fn f; 5066 // @endcode 5067 5068 // Synthesize a parameter for each argument type. 5069 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5070 AE = FT->arg_type_end(); AI != AE; ++AI) { 5071 ParmVarDecl *Param = 5072 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5073 Param->setScopeInfo(0, Params.size()); 5074 Params.push_back(Param); 5075 } 5076 } else { 5077 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5078 "Should not need args for typedef of non-prototype fn"); 5079 } 5080 5081 // Finally, we know we have the right number of parameters, install them. 5082 NewFD->setParams(Params); 5083 5084 // Process the non-inheritable attributes on this declaration. 5085 ProcessDeclAttributes(S, NewFD, D, 5086 /*NonInheritable=*/true, /*Inheritable=*/false); 5087 5088 if (!getLangOptions().CPlusPlus) { 5089 // Perform semantic checking on the function declaration. 5090 bool isExplicitSpecialization=false; 5091 if (!NewFD->isInvalidDecl()) { 5092 if (NewFD->getResultType()->isVariablyModifiedType()) { 5093 // Functions returning a variably modified type violate C99 6.7.5.2p2 5094 // because all functions have linkage. 5095 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5096 NewFD->setInvalidDecl(); 5097 } else { 5098 if (NewFD->isMain()) 5099 CheckMain(NewFD, D.getDeclSpec()); 5100 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5101 isExplicitSpecialization)); 5102 } 5103 } 5104 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5105 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5106 "previous declaration set still overloaded"); 5107 } else { 5108 // If the declarator is a template-id, translate the parser's template 5109 // argument list into our AST format. 5110 bool HasExplicitTemplateArgs = false; 5111 TemplateArgumentListInfo TemplateArgs; 5112 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5113 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5114 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5115 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5116 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5117 TemplateId->getTemplateArgs(), 5118 TemplateId->NumArgs); 5119 translateTemplateArguments(TemplateArgsPtr, 5120 TemplateArgs); 5121 TemplateArgsPtr.release(); 5122 5123 HasExplicitTemplateArgs = true; 5124 5125 if (NewFD->isInvalidDecl()) { 5126 HasExplicitTemplateArgs = false; 5127 } else if (FunctionTemplate) { 5128 // Function template with explicit template arguments. 5129 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5130 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5131 5132 HasExplicitTemplateArgs = false; 5133 } else if (!isFunctionTemplateSpecialization && 5134 !D.getDeclSpec().isFriendSpecified()) { 5135 // We have encountered something that the user meant to be a 5136 // specialization (because it has explicitly-specified template 5137 // arguments) but that was not introduced with a "template<>" (or had 5138 // too few of them). 5139 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5140 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5141 << FixItHint::CreateInsertion( 5142 D.getDeclSpec().getSourceRange().getBegin(), 5143 "template<> "); 5144 isFunctionTemplateSpecialization = true; 5145 } else { 5146 // "friend void foo<>(int);" is an implicit specialization decl. 5147 isFunctionTemplateSpecialization = true; 5148 } 5149 } else if (isFriend && isFunctionTemplateSpecialization) { 5150 // This combination is only possible in a recovery case; the user 5151 // wrote something like: 5152 // template <> friend void foo(int); 5153 // which we're recovering from as if the user had written: 5154 // friend void foo<>(int); 5155 // Go ahead and fake up a template id. 5156 HasExplicitTemplateArgs = true; 5157 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5158 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5159 } 5160 5161 // If it's a friend (and only if it's a friend), it's possible 5162 // that either the specialized function type or the specialized 5163 // template is dependent, and therefore matching will fail. In 5164 // this case, don't check the specialization yet. 5165 bool InstantiationDependent = false; 5166 if (isFunctionTemplateSpecialization && isFriend && 5167 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5168 TemplateSpecializationType::anyDependentTemplateArguments( 5169 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5170 InstantiationDependent))) { 5171 assert(HasExplicitTemplateArgs && 5172 "friend function specialization without template args"); 5173 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5174 Previous)) 5175 NewFD->setInvalidDecl(); 5176 } else if (isFunctionTemplateSpecialization) { 5177 if (CurContext->isDependentContext() && CurContext->isRecord() 5178 && !isFriend) { 5179 isDependentClassScopeExplicitSpecialization = true; 5180 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5181 diag::ext_function_specialization_in_class : 5182 diag::err_function_specialization_in_class) 5183 << NewFD->getDeclName(); 5184 } else if (CheckFunctionTemplateSpecialization(NewFD, 5185 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5186 Previous)) 5187 NewFD->setInvalidDecl(); 5188 5189 // C++ [dcl.stc]p1: 5190 // A storage-class-specifier shall not be specified in an explicit 5191 // specialization (14.7.3) 5192 if (SC != SC_None) { 5193 if (SC != NewFD->getStorageClass()) 5194 Diag(NewFD->getLocation(), 5195 diag::err_explicit_specialization_inconsistent_storage_class) 5196 << SC 5197 << FixItHint::CreateRemoval( 5198 D.getDeclSpec().getStorageClassSpecLoc()); 5199 5200 else 5201 Diag(NewFD->getLocation(), 5202 diag::ext_explicit_specialization_storage_class) 5203 << FixItHint::CreateRemoval( 5204 D.getDeclSpec().getStorageClassSpecLoc()); 5205 } 5206 5207 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5208 if (CheckMemberSpecialization(NewFD, Previous)) 5209 NewFD->setInvalidDecl(); 5210 } 5211 5212 // Perform semantic checking on the function declaration. 5213 if (!isDependentClassScopeExplicitSpecialization) { 5214 if (NewFD->isInvalidDecl()) { 5215 // If this is a class member, mark the class invalid immediately. 5216 // This avoids some consistency errors later. 5217 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5218 methodDecl->getParent()->setInvalidDecl(); 5219 } else { 5220 if (NewFD->isMain()) 5221 CheckMain(NewFD, D.getDeclSpec()); 5222 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5223 isExplicitSpecialization)); 5224 } 5225 } 5226 5227 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5228 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5229 "previous declaration set still overloaded"); 5230 5231 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5232 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5233 NewFD->setInvalidDecl(); 5234 5235 NamedDecl *PrincipalDecl = (FunctionTemplate 5236 ? cast<NamedDecl>(FunctionTemplate) 5237 : NewFD); 5238 5239 if (isFriend && D.isRedeclaration()) { 5240 AccessSpecifier Access = AS_public; 5241 if (!NewFD->isInvalidDecl()) 5242 Access = NewFD->getPreviousDeclaration()->getAccess(); 5243 5244 NewFD->setAccess(Access); 5245 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5246 5247 PrincipalDecl->setObjectOfFriendDecl(true); 5248 } 5249 5250 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5251 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5252 PrincipalDecl->setNonMemberOperator(); 5253 5254 // If we have a function template, check the template parameter 5255 // list. This will check and merge default template arguments. 5256 if (FunctionTemplate) { 5257 FunctionTemplateDecl *PrevTemplate = 5258 FunctionTemplate->getPreviousDeclaration(); 5259 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5260 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5261 D.getDeclSpec().isFriendSpecified() 5262 ? (D.isFunctionDefinition() 5263 ? TPC_FriendFunctionTemplateDefinition 5264 : TPC_FriendFunctionTemplate) 5265 : (D.getCXXScopeSpec().isSet() && 5266 DC && DC->isRecord() && 5267 DC->isDependentContext()) 5268 ? TPC_ClassTemplateMember 5269 : TPC_FunctionTemplate); 5270 } 5271 5272 if (NewFD->isInvalidDecl()) { 5273 // Ignore all the rest of this. 5274 } else if (!D.isRedeclaration()) { 5275 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5276 AddToScope }; 5277 // Fake up an access specifier if it's supposed to be a class member. 5278 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5279 NewFD->setAccess(AS_public); 5280 5281 // Qualified decls generally require a previous declaration. 5282 if (D.getCXXScopeSpec().isSet()) { 5283 // ...with the major exception of templated-scope or 5284 // dependent-scope friend declarations. 5285 5286 // TODO: we currently also suppress this check in dependent 5287 // contexts because (1) the parameter depth will be off when 5288 // matching friend templates and (2) we might actually be 5289 // selecting a friend based on a dependent factor. But there 5290 // are situations where these conditions don't apply and we 5291 // can actually do this check immediately. 5292 if (isFriend && 5293 (TemplateParamLists.size() || 5294 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5295 CurContext->isDependentContext())) { 5296 // ignore these 5297 } else { 5298 // The user tried to provide an out-of-line definition for a 5299 // function that is a member of a class or namespace, but there 5300 // was no such member function declared (C++ [class.mfct]p2, 5301 // C++ [namespace.memdef]p2). For example: 5302 // 5303 // class X { 5304 // void f() const; 5305 // }; 5306 // 5307 // void X::f() { } // ill-formed 5308 // 5309 // Complain about this problem, and attempt to suggest close 5310 // matches (e.g., those that differ only in cv-qualifiers and 5311 // whether the parameter types are references). 5312 5313 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5314 NewFD, 5315 ExtraArgs)) { 5316 AddToScope = ExtraArgs.AddToScope; 5317 return Result; 5318 } 5319 } 5320 5321 // Unqualified local friend declarations are required to resolve 5322 // to something. 5323 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5324 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5325 NewFD, 5326 ExtraArgs)) { 5327 AddToScope = ExtraArgs.AddToScope; 5328 return Result; 5329 } 5330 } 5331 5332 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5333 !isFriend && !isFunctionTemplateSpecialization && 5334 !isExplicitSpecialization) { 5335 // An out-of-line member function declaration must also be a 5336 // definition (C++ [dcl.meaning]p1). 5337 // Note that this is not the case for explicit specializations of 5338 // function templates or member functions of class templates, per 5339 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5340 // extension for compatibility with old SWIG code which likes to 5341 // generate them. 5342 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5343 << D.getCXXScopeSpec().getRange(); 5344 } 5345 } 5346 5347 5348 // Handle attributes. We need to have merged decls when handling attributes 5349 // (for example to check for conflicts, etc). 5350 // FIXME: This needs to happen before we merge declarations. Then, 5351 // let attribute merging cope with attribute conflicts. 5352 ProcessDeclAttributes(S, NewFD, D, 5353 /*NonInheritable=*/false, /*Inheritable=*/true); 5354 5355 // attributes declared post-definition are currently ignored 5356 // FIXME: This should happen during attribute merging 5357 if (D.isRedeclaration() && Previous.isSingleResult()) { 5358 const FunctionDecl *Def; 5359 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5360 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5361 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5362 Diag(Def->getLocation(), diag::note_previous_definition); 5363 } 5364 } 5365 5366 AddKnownFunctionAttributes(NewFD); 5367 5368 if (NewFD->hasAttr<OverloadableAttr>() && 5369 !NewFD->getType()->getAs<FunctionProtoType>()) { 5370 Diag(NewFD->getLocation(), 5371 diag::err_attribute_overloadable_no_prototype) 5372 << NewFD; 5373 5374 // Turn this into a variadic function with no parameters. 5375 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5376 FunctionProtoType::ExtProtoInfo EPI; 5377 EPI.Variadic = true; 5378 EPI.ExtInfo = FT->getExtInfo(); 5379 5380 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5381 NewFD->setType(R); 5382 } 5383 5384 // If there's a #pragma GCC visibility in scope, and this isn't a class 5385 // member, set the visibility of this function. 5386 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5387 AddPushedVisibilityAttribute(NewFD); 5388 5389 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5390 // marking the function. 5391 AddCFAuditedAttribute(NewFD); 5392 5393 // If this is a locally-scoped extern C function, update the 5394 // map of such names. 5395 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5396 && !NewFD->isInvalidDecl()) 5397 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5398 5399 // Set this FunctionDecl's range up to the right paren. 5400 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5401 5402 if (getLangOptions().CPlusPlus) { 5403 if (FunctionTemplate) { 5404 if (NewFD->isInvalidDecl()) 5405 FunctionTemplate->setInvalidDecl(); 5406 return FunctionTemplate; 5407 } 5408 } 5409 5410 MarkUnusedFileScopedDecl(NewFD); 5411 5412 if (getLangOptions().CUDA) 5413 if (IdentifierInfo *II = NewFD->getIdentifier()) 5414 if (!NewFD->isInvalidDecl() && 5415 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5416 if (II->isStr("cudaConfigureCall")) { 5417 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5418 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5419 5420 Context.setcudaConfigureCallDecl(NewFD); 5421 } 5422 } 5423 5424 // Here we have an function template explicit specialization at class scope. 5425 // The actually specialization will be postponed to template instatiation 5426 // time via the ClassScopeFunctionSpecializationDecl node. 5427 if (isDependentClassScopeExplicitSpecialization) { 5428 ClassScopeFunctionSpecializationDecl *NewSpec = 5429 ClassScopeFunctionSpecializationDecl::Create( 5430 Context, CurContext, SourceLocation(), 5431 cast<CXXMethodDecl>(NewFD)); 5432 CurContext->addDecl(NewSpec); 5433 AddToScope = false; 5434 } 5435 5436 return NewFD; 5437} 5438 5439/// \brief Perform semantic checking of a new function declaration. 5440/// 5441/// Performs semantic analysis of the new function declaration 5442/// NewFD. This routine performs all semantic checking that does not 5443/// require the actual declarator involved in the declaration, and is 5444/// used both for the declaration of functions as they are parsed 5445/// (called via ActOnDeclarator) and for the declaration of functions 5446/// that have been instantiated via C++ template instantiation (called 5447/// via InstantiateDecl). 5448/// 5449/// \param IsExplicitSpecialiation whether this new function declaration is 5450/// an explicit specialization of the previous declaration. 5451/// 5452/// This sets NewFD->isInvalidDecl() to true if there was an error. 5453/// 5454/// Returns true if the function declaration is a redeclaration. 5455bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5456 LookupResult &Previous, 5457 bool IsExplicitSpecialization) { 5458 assert(!NewFD->getResultType()->isVariablyModifiedType() 5459 && "Variably modified return types are not handled here"); 5460 5461 // Check for a previous declaration of this name. 5462 if (Previous.empty() && NewFD->isExternC()) { 5463 // Since we did not find anything by this name and we're declaring 5464 // an extern "C" function, look for a non-visible extern "C" 5465 // declaration with the same name. 5466 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5467 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5468 if (Pos != LocallyScopedExternalDecls.end()) 5469 Previous.addDecl(Pos->second); 5470 } 5471 5472 bool Redeclaration = false; 5473 5474 // Merge or overload the declaration with an existing declaration of 5475 // the same name, if appropriate. 5476 if (!Previous.empty()) { 5477 // Determine whether NewFD is an overload of PrevDecl or 5478 // a declaration that requires merging. If it's an overload, 5479 // there's no more work to do here; we'll just add the new 5480 // function to the scope. 5481 5482 NamedDecl *OldDecl = 0; 5483 if (!AllowOverloadingOfFunction(Previous, Context)) { 5484 Redeclaration = true; 5485 OldDecl = Previous.getFoundDecl(); 5486 } else { 5487 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5488 /*NewIsUsingDecl*/ false)) { 5489 case Ovl_Match: 5490 Redeclaration = true; 5491 break; 5492 5493 case Ovl_NonFunction: 5494 Redeclaration = true; 5495 break; 5496 5497 case Ovl_Overload: 5498 Redeclaration = false; 5499 break; 5500 } 5501 5502 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5503 // If a function name is overloadable in C, then every function 5504 // with that name must be marked "overloadable". 5505 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5506 << Redeclaration << NewFD; 5507 NamedDecl *OverloadedDecl = 0; 5508 if (Redeclaration) 5509 OverloadedDecl = OldDecl; 5510 else if (!Previous.empty()) 5511 OverloadedDecl = Previous.getRepresentativeDecl(); 5512 if (OverloadedDecl) 5513 Diag(OverloadedDecl->getLocation(), 5514 diag::note_attribute_overloadable_prev_overload); 5515 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5516 Context)); 5517 } 5518 } 5519 5520 if (Redeclaration) { 5521 // NewFD and OldDecl represent declarations that need to be 5522 // merged. 5523 if (MergeFunctionDecl(NewFD, OldDecl)) { 5524 NewFD->setInvalidDecl(); 5525 return Redeclaration; 5526 } 5527 5528 Previous.clear(); 5529 Previous.addDecl(OldDecl); 5530 5531 if (FunctionTemplateDecl *OldTemplateDecl 5532 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5533 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5534 FunctionTemplateDecl *NewTemplateDecl 5535 = NewFD->getDescribedFunctionTemplate(); 5536 assert(NewTemplateDecl && "Template/non-template mismatch"); 5537 if (CXXMethodDecl *Method 5538 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5539 Method->setAccess(OldTemplateDecl->getAccess()); 5540 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5541 } 5542 5543 // If this is an explicit specialization of a member that is a function 5544 // template, mark it as a member specialization. 5545 if (IsExplicitSpecialization && 5546 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5547 NewTemplateDecl->setMemberSpecialization(); 5548 assert(OldTemplateDecl->isMemberSpecialization()); 5549 } 5550 5551 if (OldTemplateDecl->isModulePrivate()) 5552 NewTemplateDecl->setModulePrivate(); 5553 5554 } else { 5555 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5556 NewFD->setAccess(OldDecl->getAccess()); 5557 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5558 } 5559 } 5560 } 5561 5562 // Semantic checking for this function declaration (in isolation). 5563 if (getLangOptions().CPlusPlus) { 5564 // C++-specific checks. 5565 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5566 CheckConstructor(Constructor); 5567 } else if (CXXDestructorDecl *Destructor = 5568 dyn_cast<CXXDestructorDecl>(NewFD)) { 5569 CXXRecordDecl *Record = Destructor->getParent(); 5570 QualType ClassType = Context.getTypeDeclType(Record); 5571 5572 // FIXME: Shouldn't we be able to perform this check even when the class 5573 // type is dependent? Both gcc and edg can handle that. 5574 if (!ClassType->isDependentType()) { 5575 DeclarationName Name 5576 = Context.DeclarationNames.getCXXDestructorName( 5577 Context.getCanonicalType(ClassType)); 5578 if (NewFD->getDeclName() != Name) { 5579 Diag(NewFD->getLocation(), diag::err_destructor_name); 5580 NewFD->setInvalidDecl(); 5581 return Redeclaration; 5582 } 5583 } 5584 } else if (CXXConversionDecl *Conversion 5585 = dyn_cast<CXXConversionDecl>(NewFD)) { 5586 ActOnConversionDeclarator(Conversion); 5587 } 5588 5589 // Find any virtual functions that this function overrides. 5590 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5591 if (!Method->isFunctionTemplateSpecialization() && 5592 !Method->getDescribedFunctionTemplate()) { 5593 if (AddOverriddenMethods(Method->getParent(), Method)) { 5594 // If the function was marked as "static", we have a problem. 5595 if (NewFD->getStorageClass() == SC_Static) { 5596 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5597 << NewFD->getDeclName(); 5598 for (CXXMethodDecl::method_iterator 5599 Overridden = Method->begin_overridden_methods(), 5600 OverriddenEnd = Method->end_overridden_methods(); 5601 Overridden != OverriddenEnd; 5602 ++Overridden) { 5603 Diag((*Overridden)->getLocation(), 5604 diag::note_overridden_virtual_function); 5605 } 5606 } 5607 } 5608 } 5609 } 5610 5611 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5612 if (NewFD->isOverloadedOperator() && 5613 CheckOverloadedOperatorDeclaration(NewFD)) { 5614 NewFD->setInvalidDecl(); 5615 return Redeclaration; 5616 } 5617 5618 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5619 if (NewFD->getLiteralIdentifier() && 5620 CheckLiteralOperatorDeclaration(NewFD)) { 5621 NewFD->setInvalidDecl(); 5622 return Redeclaration; 5623 } 5624 5625 // In C++, check default arguments now that we have merged decls. Unless 5626 // the lexical context is the class, because in this case this is done 5627 // during delayed parsing anyway. 5628 if (!CurContext->isRecord()) 5629 CheckCXXDefaultArguments(NewFD); 5630 5631 // If this function declares a builtin function, check the type of this 5632 // declaration against the expected type for the builtin. 5633 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5634 ASTContext::GetBuiltinTypeError Error; 5635 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5636 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5637 // The type of this function differs from the type of the builtin, 5638 // so forget about the builtin entirely. 5639 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5640 } 5641 } 5642 } 5643 return Redeclaration; 5644} 5645 5646void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5647 // C++ [basic.start.main]p3: A program that declares main to be inline 5648 // or static is ill-formed. 5649 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5650 // shall not appear in a declaration of main. 5651 // static main is not an error under C99, but we should warn about it. 5652 if (FD->getStorageClass() == SC_Static) 5653 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5654 ? diag::err_static_main : diag::warn_static_main) 5655 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5656 if (FD->isInlineSpecified()) 5657 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5658 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5659 5660 QualType T = FD->getType(); 5661 assert(T->isFunctionType() && "function decl is not of function type"); 5662 const FunctionType* FT = T->getAs<FunctionType>(); 5663 5664 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5665 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5666 FD->setInvalidDecl(true); 5667 } 5668 5669 // Treat protoless main() as nullary. 5670 if (isa<FunctionNoProtoType>(FT)) return; 5671 5672 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5673 unsigned nparams = FTP->getNumArgs(); 5674 assert(FD->getNumParams() == nparams); 5675 5676 bool HasExtraParameters = (nparams > 3); 5677 5678 // Darwin passes an undocumented fourth argument of type char**. If 5679 // other platforms start sprouting these, the logic below will start 5680 // getting shifty. 5681 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5682 HasExtraParameters = false; 5683 5684 if (HasExtraParameters) { 5685 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5686 FD->setInvalidDecl(true); 5687 nparams = 3; 5688 } 5689 5690 // FIXME: a lot of the following diagnostics would be improved 5691 // if we had some location information about types. 5692 5693 QualType CharPP = 5694 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5695 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5696 5697 for (unsigned i = 0; i < nparams; ++i) { 5698 QualType AT = FTP->getArgType(i); 5699 5700 bool mismatch = true; 5701 5702 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5703 mismatch = false; 5704 else if (Expected[i] == CharPP) { 5705 // As an extension, the following forms are okay: 5706 // char const ** 5707 // char const * const * 5708 // char * const * 5709 5710 QualifierCollector qs; 5711 const PointerType* PT; 5712 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5713 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5714 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5715 qs.removeConst(); 5716 mismatch = !qs.empty(); 5717 } 5718 } 5719 5720 if (mismatch) { 5721 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5722 // TODO: suggest replacing given type with expected type 5723 FD->setInvalidDecl(true); 5724 } 5725 } 5726 5727 if (nparams == 1 && !FD->isInvalidDecl()) { 5728 Diag(FD->getLocation(), diag::warn_main_one_arg); 5729 } 5730 5731 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5732 Diag(FD->getLocation(), diag::err_main_template_decl); 5733 FD->setInvalidDecl(); 5734 } 5735} 5736 5737bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5738 // FIXME: Need strict checking. In C89, we need to check for 5739 // any assignment, increment, decrement, function-calls, or 5740 // commas outside of a sizeof. In C99, it's the same list, 5741 // except that the aforementioned are allowed in unevaluated 5742 // expressions. Everything else falls under the 5743 // "may accept other forms of constant expressions" exception. 5744 // (We never end up here for C++, so the constant expression 5745 // rules there don't matter.) 5746 if (Init->isConstantInitializer(Context, false)) 5747 return false; 5748 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5749 << Init->getSourceRange(); 5750 return true; 5751} 5752 5753namespace { 5754 // Visits an initialization expression to see if OrigDecl is evaluated in 5755 // its own initialization and throws a warning if it does. 5756 class SelfReferenceChecker 5757 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5758 Sema &S; 5759 Decl *OrigDecl; 5760 bool isRecordType; 5761 bool isPODType; 5762 5763 public: 5764 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5765 5766 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5767 S(S), OrigDecl(OrigDecl) { 5768 isPODType = false; 5769 isRecordType = false; 5770 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5771 isPODType = VD->getType().isPODType(S.Context); 5772 isRecordType = VD->getType()->isRecordType(); 5773 } 5774 } 5775 5776 void VisitExpr(Expr *E) { 5777 if (isa<ObjCMessageExpr>(*E)) return; 5778 if (isRecordType) { 5779 Expr *expr = E; 5780 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5781 ValueDecl *VD = ME->getMemberDecl(); 5782 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5783 expr = ME->getBase(); 5784 } 5785 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5786 HandleDeclRefExpr(DRE); 5787 return; 5788 } 5789 } 5790 Inherited::VisitExpr(E); 5791 } 5792 5793 void VisitMemberExpr(MemberExpr *E) { 5794 if (E->getType()->canDecayToPointerType()) return; 5795 if (isa<FieldDecl>(E->getMemberDecl())) 5796 if (DeclRefExpr *DRE 5797 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5798 HandleDeclRefExpr(DRE); 5799 return; 5800 } 5801 Inherited::VisitMemberExpr(E); 5802 } 5803 5804 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5805 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5806 (isRecordType && E->getCastKind() == CK_NoOp)) { 5807 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5808 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5809 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5810 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5811 HandleDeclRefExpr(DRE); 5812 return; 5813 } 5814 } 5815 Inherited::VisitImplicitCastExpr(E); 5816 } 5817 5818 void VisitUnaryOperator(UnaryOperator *E) { 5819 // For POD record types, addresses of its own members are well-defined. 5820 if (isRecordType && isPODType) return; 5821 Inherited::VisitUnaryOperator(E); 5822 } 5823 5824 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5825 Decl* ReferenceDecl = DRE->getDecl(); 5826 if (OrigDecl != ReferenceDecl) return; 5827 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5828 Sema::NotForRedeclaration); 5829 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5830 S.PDiag(diag::warn_uninit_self_reference_in_init) 5831 << Result.getLookupName() 5832 << OrigDecl->getLocation() 5833 << DRE->getSourceRange()); 5834 } 5835 }; 5836} 5837 5838/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5839void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5840 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5841} 5842 5843/// AddInitializerToDecl - Adds the initializer Init to the 5844/// declaration dcl. If DirectInit is true, this is C++ direct 5845/// initialization rather than copy initialization. 5846void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5847 bool DirectInit, bool TypeMayContainAuto) { 5848 // If there is no declaration, there was an error parsing it. Just ignore 5849 // the initializer. 5850 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5851 return; 5852 5853 // Check for self-references within variable initializers. 5854 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5855 // Variables declared within a function/method body are handled 5856 // by a dataflow analysis. 5857 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5858 CheckSelfReference(RealDecl, Init); 5859 } 5860 else { 5861 CheckSelfReference(RealDecl, Init); 5862 } 5863 5864 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5865 // With declarators parsed the way they are, the parser cannot 5866 // distinguish between a normal initializer and a pure-specifier. 5867 // Thus this grotesque test. 5868 IntegerLiteral *IL; 5869 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5870 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5871 CheckPureMethod(Method, Init->getSourceRange()); 5872 else { 5873 Diag(Method->getLocation(), diag::err_member_function_initialization) 5874 << Method->getDeclName() << Init->getSourceRange(); 5875 Method->setInvalidDecl(); 5876 } 5877 return; 5878 } 5879 5880 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5881 if (!VDecl) { 5882 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5883 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5884 RealDecl->setInvalidDecl(); 5885 return; 5886 } 5887 5888 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5889 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5890 TypeSourceInfo *DeducedType = 0; 5891 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5892 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5893 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5894 << Init->getSourceRange(); 5895 if (!DeducedType) { 5896 RealDecl->setInvalidDecl(); 5897 return; 5898 } 5899 VDecl->setTypeSourceInfo(DeducedType); 5900 VDecl->setType(DeducedType->getType()); 5901 5902 // In ARC, infer lifetime. 5903 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5904 VDecl->setInvalidDecl(); 5905 5906 // If this is a redeclaration, check that the type we just deduced matches 5907 // the previously declared type. 5908 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5909 MergeVarDeclTypes(VDecl, Old); 5910 } 5911 5912 5913 // A definition must end up with a complete type, which means it must be 5914 // complete with the restriction that an array type might be completed by the 5915 // initializer; note that later code assumes this restriction. 5916 QualType BaseDeclType = VDecl->getType(); 5917 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5918 BaseDeclType = Array->getElementType(); 5919 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5920 diag::err_typecheck_decl_incomplete_type)) { 5921 RealDecl->setInvalidDecl(); 5922 return; 5923 } 5924 5925 // The variable can not have an abstract class type. 5926 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5927 diag::err_abstract_type_in_decl, 5928 AbstractVariableType)) 5929 VDecl->setInvalidDecl(); 5930 5931 const VarDecl *Def; 5932 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5933 Diag(VDecl->getLocation(), diag::err_redefinition) 5934 << VDecl->getDeclName(); 5935 Diag(Def->getLocation(), diag::note_previous_definition); 5936 VDecl->setInvalidDecl(); 5937 return; 5938 } 5939 5940 const VarDecl* PrevInit = 0; 5941 if (getLangOptions().CPlusPlus) { 5942 // C++ [class.static.data]p4 5943 // If a static data member is of const integral or const 5944 // enumeration type, its declaration in the class definition can 5945 // specify a constant-initializer which shall be an integral 5946 // constant expression (5.19). In that case, the member can appear 5947 // in integral constant expressions. The member shall still be 5948 // defined in a namespace scope if it is used in the program and the 5949 // namespace scope definition shall not contain an initializer. 5950 // 5951 // We already performed a redefinition check above, but for static 5952 // data members we also need to check whether there was an in-class 5953 // declaration with an initializer. 5954 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5955 Diag(VDecl->getLocation(), diag::err_redefinition) 5956 << VDecl->getDeclName(); 5957 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5958 return; 5959 } 5960 5961 if (VDecl->hasLocalStorage()) 5962 getCurFunction()->setHasBranchProtectedScope(); 5963 5964 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5965 VDecl->setInvalidDecl(); 5966 return; 5967 } 5968 } 5969 5970 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5971 // a kernel function cannot be initialized." 5972 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5973 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5974 VDecl->setInvalidDecl(); 5975 return; 5976 } 5977 5978 // Capture the variable that is being initialized and the style of 5979 // initialization. 5980 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5981 5982 // FIXME: Poor source location information. 5983 InitializationKind Kind 5984 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5985 Init->getLocStart(), 5986 Init->getLocEnd()) 5987 : InitializationKind::CreateCopy(VDecl->getLocation(), 5988 Init->getLocStart()); 5989 5990 // Get the decls type and save a reference for later, since 5991 // CheckInitializerTypes may change it. 5992 QualType DclT = VDecl->getType(), SavT = DclT; 5993 if (VDecl->isLocalVarDecl()) { 5994 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5995 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5996 VDecl->setInvalidDecl(); 5997 } else if (!VDecl->isInvalidDecl()) { 5998 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5999 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6000 MultiExprArg(*this, &Init, 1), 6001 &DclT); 6002 if (Result.isInvalid()) { 6003 VDecl->setInvalidDecl(); 6004 return; 6005 } 6006 6007 Init = Result.takeAs<Expr>(); 6008 6009 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6010 // Don't check invalid declarations to avoid emitting useless diagnostics. 6011 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6012 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6013 CheckForConstantInitializer(Init, DclT); 6014 } 6015 } 6016 } else if (VDecl->isStaticDataMember() && 6017 VDecl->getLexicalDeclContext()->isRecord()) { 6018 // This is an in-class initialization for a static data member, e.g., 6019 // 6020 // struct S { 6021 // static const int value = 17; 6022 // }; 6023 6024 // Try to perform the initialization regardless. 6025 if (!VDecl->isInvalidDecl()) { 6026 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6027 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6028 MultiExprArg(*this, &Init, 1), 6029 &DclT); 6030 if (Result.isInvalid()) { 6031 VDecl->setInvalidDecl(); 6032 return; 6033 } 6034 6035 Init = Result.takeAs<Expr>(); 6036 } 6037 6038 // C++ [class.mem]p4: 6039 // A member-declarator can contain a constant-initializer only 6040 // if it declares a static member (9.4) of const integral or 6041 // const enumeration type, see 9.4.2. 6042 // 6043 // C++0x [class.static.data]p3: 6044 // If a non-volatile const static data member is of integral or 6045 // enumeration type, its declaration in the class definition can 6046 // specify a brace-or-equal-initializer in which every initalizer-clause 6047 // that is an assignment-expression is a constant expression. A static 6048 // data member of literal type can be declared in the class definition 6049 // with the constexpr specifier; if so, its declaration shall specify a 6050 // brace-or-equal-initializer in which every initializer-clause that is 6051 // an assignment-expression is a constant expression. 6052 QualType T = VDecl->getType(); 6053 6054 // Do nothing on dependent types. 6055 if (T->isDependentType()) { 6056 6057 // Allow any 'static constexpr' members, whether or not they are of literal 6058 // type. We separately check that the initializer is a constant expression, 6059 // which implicitly requires the member to be of literal type. 6060 } else if (VDecl->isConstexpr()) { 6061 6062 // Require constness. 6063 } else if (!T.isConstQualified()) { 6064 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6065 << Init->getSourceRange(); 6066 VDecl->setInvalidDecl(); 6067 6068 // We allow integer constant expressions in all cases. 6069 } else if (T->isIntegralOrEnumerationType()) { 6070 // Check whether the expression is a constant expression. 6071 SourceLocation Loc; 6072 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6073 // In C++0x, a non-constexpr const static data member with an 6074 // in-class initializer cannot be volatile. 6075 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6076 else if (Init->isValueDependent()) 6077 ; // Nothing to check. 6078 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6079 ; // Ok, it's an ICE! 6080 else if (Init->isEvaluatable(Context)) { 6081 // If we can constant fold the initializer through heroics, accept it, 6082 // but report this as a use of an extension for -pedantic. 6083 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6084 << Init->getSourceRange(); 6085 } else { 6086 // Otherwise, this is some crazy unknown case. Report the issue at the 6087 // location provided by the isIntegerConstantExpr failed check. 6088 Diag(Loc, diag::err_in_class_initializer_non_constant) 6089 << Init->getSourceRange(); 6090 VDecl->setInvalidDecl(); 6091 } 6092 6093 // We allow floating-point constants as an extension. 6094 } else if (T->isFloatingType()) { // also permits complex, which is ok 6095 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6096 << T << Init->getSourceRange(); 6097 if (getLangOptions().CPlusPlus0x) 6098 Diag(VDecl->getLocation(), 6099 diag::note_in_class_initializer_float_type_constexpr) 6100 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6101 6102 if (!Init->isValueDependent() && 6103 !Init->isConstantInitializer(Context, false)) { 6104 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6105 << Init->getSourceRange(); 6106 VDecl->setInvalidDecl(); 6107 } 6108 6109 // Suggest adding 'constexpr' in C++0x for literal types. 6110 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6111 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6112 << T << Init->getSourceRange() 6113 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6114 VDecl->setConstexpr(true); 6115 6116 } else { 6117 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6118 << T << Init->getSourceRange(); 6119 VDecl->setInvalidDecl(); 6120 } 6121 } else if (VDecl->isFileVarDecl()) { 6122 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6123 (!getLangOptions().CPlusPlus || 6124 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6125 Diag(VDecl->getLocation(), diag::warn_extern_init); 6126 if (!VDecl->isInvalidDecl()) { 6127 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6128 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6129 MultiExprArg(*this, &Init, 1), 6130 &DclT); 6131 if (Result.isInvalid()) { 6132 VDecl->setInvalidDecl(); 6133 return; 6134 } 6135 6136 Init = Result.takeAs<Expr>(); 6137 } 6138 6139 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6140 // Don't check invalid declarations to avoid emitting useless diagnostics. 6141 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6142 // C99 6.7.8p4. All file scoped initializers need to be constant. 6143 CheckForConstantInitializer(Init, DclT); 6144 } 6145 } 6146 // If the type changed, it means we had an incomplete type that was 6147 // completed by the initializer. For example: 6148 // int ary[] = { 1, 3, 5 }; 6149 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6150 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6151 VDecl->setType(DclT); 6152 Init->setType(DclT); 6153 } 6154 6155 // Check any implicit conversions within the expression. 6156 CheckImplicitConversions(Init, VDecl->getLocation()); 6157 6158 if (!VDecl->isInvalidDecl()) 6159 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6160 6161 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6162 !VDecl->getType()->isDependentType() && 6163 !Init->isTypeDependent() && !Init->isValueDependent() && 6164 !Init->isConstantInitializer(Context, 6165 VDecl->getType()->isReferenceType())) { 6166 // FIXME: Improve this diagnostic to explain why the initializer is not 6167 // a constant expression. 6168 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6169 << VDecl << Init->getSourceRange(); 6170 } 6171 6172 Init = MaybeCreateExprWithCleanups(Init); 6173 // Attach the initializer to the decl. 6174 VDecl->setInit(Init); 6175 6176 CheckCompleteVariableDeclaration(VDecl); 6177} 6178 6179/// ActOnInitializerError - Given that there was an error parsing an 6180/// initializer for the given declaration, try to return to some form 6181/// of sanity. 6182void Sema::ActOnInitializerError(Decl *D) { 6183 // Our main concern here is re-establishing invariants like "a 6184 // variable's type is either dependent or complete". 6185 if (!D || D->isInvalidDecl()) return; 6186 6187 VarDecl *VD = dyn_cast<VarDecl>(D); 6188 if (!VD) return; 6189 6190 // Auto types are meaningless if we can't make sense of the initializer. 6191 if (ParsingInitForAutoVars.count(D)) { 6192 D->setInvalidDecl(); 6193 return; 6194 } 6195 6196 QualType Ty = VD->getType(); 6197 if (Ty->isDependentType()) return; 6198 6199 // Require a complete type. 6200 if (RequireCompleteType(VD->getLocation(), 6201 Context.getBaseElementType(Ty), 6202 diag::err_typecheck_decl_incomplete_type)) { 6203 VD->setInvalidDecl(); 6204 return; 6205 } 6206 6207 // Require an abstract type. 6208 if (RequireNonAbstractType(VD->getLocation(), Ty, 6209 diag::err_abstract_type_in_decl, 6210 AbstractVariableType)) { 6211 VD->setInvalidDecl(); 6212 return; 6213 } 6214 6215 // Don't bother complaining about constructors or destructors, 6216 // though. 6217} 6218 6219void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6220 bool TypeMayContainAuto) { 6221 // If there is no declaration, there was an error parsing it. Just ignore it. 6222 if (RealDecl == 0) 6223 return; 6224 6225 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6226 QualType Type = Var->getType(); 6227 6228 // C++0x [dcl.spec.auto]p3 6229 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6230 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6231 << Var->getDeclName() << Type; 6232 Var->setInvalidDecl(); 6233 return; 6234 } 6235 6236 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6237 // have an initializer. 6238 // C++0x [class.static.data]p3: A static data member can be declared with 6239 // the constexpr specifier; if so, its declaration shall specify 6240 // a brace-or-equal-initializer. 6241 // 6242 // A static data member's definition may inherit an initializer from an 6243 // in-class declaration. 6244 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6245 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6246 << Var->getDeclName(); 6247 Var->setInvalidDecl(); 6248 return; 6249 } 6250 6251 switch (Var->isThisDeclarationADefinition()) { 6252 case VarDecl::Definition: 6253 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6254 break; 6255 6256 // We have an out-of-line definition of a static data member 6257 // that has an in-class initializer, so we type-check this like 6258 // a declaration. 6259 // 6260 // Fall through 6261 6262 case VarDecl::DeclarationOnly: 6263 // It's only a declaration. 6264 6265 // Block scope. C99 6.7p7: If an identifier for an object is 6266 // declared with no linkage (C99 6.2.2p6), the type for the 6267 // object shall be complete. 6268 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6269 !Var->getLinkage() && !Var->isInvalidDecl() && 6270 RequireCompleteType(Var->getLocation(), Type, 6271 diag::err_typecheck_decl_incomplete_type)) 6272 Var->setInvalidDecl(); 6273 6274 // Make sure that the type is not abstract. 6275 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6276 RequireNonAbstractType(Var->getLocation(), Type, 6277 diag::err_abstract_type_in_decl, 6278 AbstractVariableType)) 6279 Var->setInvalidDecl(); 6280 return; 6281 6282 case VarDecl::TentativeDefinition: 6283 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6284 // object that has file scope without an initializer, and without a 6285 // storage-class specifier or with the storage-class specifier "static", 6286 // constitutes a tentative definition. Note: A tentative definition with 6287 // external linkage is valid (C99 6.2.2p5). 6288 if (!Var->isInvalidDecl()) { 6289 if (const IncompleteArrayType *ArrayT 6290 = Context.getAsIncompleteArrayType(Type)) { 6291 if (RequireCompleteType(Var->getLocation(), 6292 ArrayT->getElementType(), 6293 diag::err_illegal_decl_array_incomplete_type)) 6294 Var->setInvalidDecl(); 6295 } else if (Var->getStorageClass() == SC_Static) { 6296 // C99 6.9.2p3: If the declaration of an identifier for an object is 6297 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6298 // declared type shall not be an incomplete type. 6299 // NOTE: code such as the following 6300 // static struct s; 6301 // struct s { int a; }; 6302 // is accepted by gcc. Hence here we issue a warning instead of 6303 // an error and we do not invalidate the static declaration. 6304 // NOTE: to avoid multiple warnings, only check the first declaration. 6305 if (Var->getPreviousDeclaration() == 0) 6306 RequireCompleteType(Var->getLocation(), Type, 6307 diag::ext_typecheck_decl_incomplete_type); 6308 } 6309 } 6310 6311 // Record the tentative definition; we're done. 6312 if (!Var->isInvalidDecl()) 6313 TentativeDefinitions.push_back(Var); 6314 return; 6315 } 6316 6317 // Provide a specific diagnostic for uninitialized variable 6318 // definitions with incomplete array type. 6319 if (Type->isIncompleteArrayType()) { 6320 Diag(Var->getLocation(), 6321 diag::err_typecheck_incomplete_array_needs_initializer); 6322 Var->setInvalidDecl(); 6323 return; 6324 } 6325 6326 // Provide a specific diagnostic for uninitialized variable 6327 // definitions with reference type. 6328 if (Type->isReferenceType()) { 6329 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6330 << Var->getDeclName() 6331 << SourceRange(Var->getLocation(), Var->getLocation()); 6332 Var->setInvalidDecl(); 6333 return; 6334 } 6335 6336 // Do not attempt to type-check the default initializer for a 6337 // variable with dependent type. 6338 if (Type->isDependentType()) 6339 return; 6340 6341 if (Var->isInvalidDecl()) 6342 return; 6343 6344 if (RequireCompleteType(Var->getLocation(), 6345 Context.getBaseElementType(Type), 6346 diag::err_typecheck_decl_incomplete_type)) { 6347 Var->setInvalidDecl(); 6348 return; 6349 } 6350 6351 // The variable can not have an abstract class type. 6352 if (RequireNonAbstractType(Var->getLocation(), Type, 6353 diag::err_abstract_type_in_decl, 6354 AbstractVariableType)) { 6355 Var->setInvalidDecl(); 6356 return; 6357 } 6358 6359 // Check for jumps past the implicit initializer. C++0x 6360 // clarifies that this applies to a "variable with automatic 6361 // storage duration", not a "local variable". 6362 // C++0x [stmt.dcl]p3 6363 // A program that jumps from a point where a variable with automatic 6364 // storage duration is not in scope to a point where it is in scope is 6365 // ill-formed unless the variable has scalar type, class type with a 6366 // trivial default constructor and a trivial destructor, a cv-qualified 6367 // version of one of these types, or an array of one of the preceding 6368 // types and is declared without an initializer. 6369 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6370 if (const RecordType *Record 6371 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6372 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6373 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6374 (getLangOptions().CPlusPlus0x && 6375 (!CXXRecord->hasTrivialDefaultConstructor() || 6376 !CXXRecord->hasTrivialDestructor()))) 6377 getCurFunction()->setHasBranchProtectedScope(); 6378 } 6379 } 6380 6381 // C++03 [dcl.init]p9: 6382 // If no initializer is specified for an object, and the 6383 // object is of (possibly cv-qualified) non-POD class type (or 6384 // array thereof), the object shall be default-initialized; if 6385 // the object is of const-qualified type, the underlying class 6386 // type shall have a user-declared default 6387 // constructor. Otherwise, if no initializer is specified for 6388 // a non- static object, the object and its subobjects, if 6389 // any, have an indeterminate initial value); if the object 6390 // or any of its subobjects are of const-qualified type, the 6391 // program is ill-formed. 6392 // C++0x [dcl.init]p11: 6393 // If no initializer is specified for an object, the object is 6394 // default-initialized; [...]. 6395 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6396 InitializationKind Kind 6397 = InitializationKind::CreateDefault(Var->getLocation()); 6398 6399 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6400 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6401 MultiExprArg(*this, 0, 0)); 6402 if (Init.isInvalid()) 6403 Var->setInvalidDecl(); 6404 else if (Init.get()) 6405 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6406 6407 CheckCompleteVariableDeclaration(Var); 6408 } 6409} 6410 6411void Sema::ActOnCXXForRangeDecl(Decl *D) { 6412 VarDecl *VD = dyn_cast<VarDecl>(D); 6413 if (!VD) { 6414 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6415 D->setInvalidDecl(); 6416 return; 6417 } 6418 6419 VD->setCXXForRangeDecl(true); 6420 6421 // for-range-declaration cannot be given a storage class specifier. 6422 int Error = -1; 6423 switch (VD->getStorageClassAsWritten()) { 6424 case SC_None: 6425 break; 6426 case SC_Extern: 6427 Error = 0; 6428 break; 6429 case SC_Static: 6430 Error = 1; 6431 break; 6432 case SC_PrivateExtern: 6433 Error = 2; 6434 break; 6435 case SC_Auto: 6436 Error = 3; 6437 break; 6438 case SC_Register: 6439 Error = 4; 6440 break; 6441 case SC_OpenCLWorkGroupLocal: 6442 llvm_unreachable("Unexpected storage class"); 6443 } 6444 if (VD->isConstexpr()) 6445 Error = 5; 6446 if (Error != -1) { 6447 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6448 << VD->getDeclName() << Error; 6449 D->setInvalidDecl(); 6450 } 6451} 6452 6453void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6454 if (var->isInvalidDecl()) return; 6455 6456 // In ARC, don't allow jumps past the implicit initialization of a 6457 // local retaining variable. 6458 if (getLangOptions().ObjCAutoRefCount && 6459 var->hasLocalStorage()) { 6460 switch (var->getType().getObjCLifetime()) { 6461 case Qualifiers::OCL_None: 6462 case Qualifiers::OCL_ExplicitNone: 6463 case Qualifiers::OCL_Autoreleasing: 6464 break; 6465 6466 case Qualifiers::OCL_Weak: 6467 case Qualifiers::OCL_Strong: 6468 getCurFunction()->setHasBranchProtectedScope(); 6469 break; 6470 } 6471 } 6472 6473 // All the following checks are C++ only. 6474 if (!getLangOptions().CPlusPlus) return; 6475 6476 QualType baseType = Context.getBaseElementType(var->getType()); 6477 if (baseType->isDependentType()) return; 6478 6479 // __block variables might require us to capture a copy-initializer. 6480 if (var->hasAttr<BlocksAttr>()) { 6481 // It's currently invalid to ever have a __block variable with an 6482 // array type; should we diagnose that here? 6483 6484 // Regardless, we don't want to ignore array nesting when 6485 // constructing this copy. 6486 QualType type = var->getType(); 6487 6488 if (type->isStructureOrClassType()) { 6489 SourceLocation poi = var->getLocation(); 6490 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6491 ExprResult result = 6492 PerformCopyInitialization( 6493 InitializedEntity::InitializeBlock(poi, type, false), 6494 poi, Owned(varRef)); 6495 if (!result.isInvalid()) { 6496 result = MaybeCreateExprWithCleanups(result); 6497 Expr *init = result.takeAs<Expr>(); 6498 Context.setBlockVarCopyInits(var, init); 6499 } 6500 } 6501 } 6502 6503 // Check for global constructors. 6504 if (!var->getDeclContext()->isDependentContext() && 6505 var->hasGlobalStorage() && 6506 !var->isStaticLocal() && 6507 var->getInit() && 6508 !var->getInit()->isConstantInitializer(Context, 6509 baseType->isReferenceType())) 6510 Diag(var->getLocation(), diag::warn_global_constructor) 6511 << var->getInit()->getSourceRange(); 6512 6513 // Require the destructor. 6514 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6515 FinalizeVarWithDestructor(var, recordType); 6516} 6517 6518/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6519/// any semantic actions necessary after any initializer has been attached. 6520void 6521Sema::FinalizeDeclaration(Decl *ThisDecl) { 6522 // Note that we are no longer parsing the initializer for this declaration. 6523 ParsingInitForAutoVars.erase(ThisDecl); 6524} 6525 6526Sema::DeclGroupPtrTy 6527Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6528 Decl **Group, unsigned NumDecls) { 6529 SmallVector<Decl*, 8> Decls; 6530 6531 if (DS.isTypeSpecOwned()) 6532 Decls.push_back(DS.getRepAsDecl()); 6533 6534 for (unsigned i = 0; i != NumDecls; ++i) 6535 if (Decl *D = Group[i]) 6536 Decls.push_back(D); 6537 6538 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6539 DS.getTypeSpecType() == DeclSpec::TST_auto); 6540} 6541 6542/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6543/// group, performing any necessary semantic checking. 6544Sema::DeclGroupPtrTy 6545Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6546 bool TypeMayContainAuto) { 6547 // C++0x [dcl.spec.auto]p7: 6548 // If the type deduced for the template parameter U is not the same in each 6549 // deduction, the program is ill-formed. 6550 // FIXME: When initializer-list support is added, a distinction is needed 6551 // between the deduced type U and the deduced type which 'auto' stands for. 6552 // auto a = 0, b = { 1, 2, 3 }; 6553 // is legal because the deduced type U is 'int' in both cases. 6554 if (TypeMayContainAuto && NumDecls > 1) { 6555 QualType Deduced; 6556 CanQualType DeducedCanon; 6557 VarDecl *DeducedDecl = 0; 6558 for (unsigned i = 0; i != NumDecls; ++i) { 6559 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6560 AutoType *AT = D->getType()->getContainedAutoType(); 6561 // Don't reissue diagnostics when instantiating a template. 6562 if (AT && D->isInvalidDecl()) 6563 break; 6564 if (AT && AT->isDeduced()) { 6565 QualType U = AT->getDeducedType(); 6566 CanQualType UCanon = Context.getCanonicalType(U); 6567 if (Deduced.isNull()) { 6568 Deduced = U; 6569 DeducedCanon = UCanon; 6570 DeducedDecl = D; 6571 } else if (DeducedCanon != UCanon) { 6572 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6573 diag::err_auto_different_deductions) 6574 << Deduced << DeducedDecl->getDeclName() 6575 << U << D->getDeclName() 6576 << DeducedDecl->getInit()->getSourceRange() 6577 << D->getInit()->getSourceRange(); 6578 D->setInvalidDecl(); 6579 break; 6580 } 6581 } 6582 } 6583 } 6584 } 6585 6586 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6587} 6588 6589 6590/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6591/// to introduce parameters into function prototype scope. 6592Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6593 const DeclSpec &DS = D.getDeclSpec(); 6594 6595 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6596 VarDecl::StorageClass StorageClass = SC_None; 6597 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6598 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6599 StorageClass = SC_Register; 6600 StorageClassAsWritten = SC_Register; 6601 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6602 Diag(DS.getStorageClassSpecLoc(), 6603 diag::err_invalid_storage_class_in_func_decl); 6604 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6605 } 6606 6607 if (D.getDeclSpec().isThreadSpecified()) 6608 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6609 if (D.getDeclSpec().isConstexprSpecified()) 6610 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6611 << 0; 6612 6613 DiagnoseFunctionSpecifiers(D); 6614 6615 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6616 QualType parmDeclType = TInfo->getType(); 6617 6618 if (getLangOptions().CPlusPlus) { 6619 // Check that there are no default arguments inside the type of this 6620 // parameter. 6621 CheckExtraCXXDefaultArguments(D); 6622 6623 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6624 if (D.getCXXScopeSpec().isSet()) { 6625 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6626 << D.getCXXScopeSpec().getRange(); 6627 D.getCXXScopeSpec().clear(); 6628 } 6629 } 6630 6631 // Ensure we have a valid name 6632 IdentifierInfo *II = 0; 6633 if (D.hasName()) { 6634 II = D.getIdentifier(); 6635 if (!II) { 6636 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6637 << GetNameForDeclarator(D).getName().getAsString(); 6638 D.setInvalidType(true); 6639 } 6640 } 6641 6642 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6643 if (II) { 6644 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6645 ForRedeclaration); 6646 LookupName(R, S); 6647 if (R.isSingleResult()) { 6648 NamedDecl *PrevDecl = R.getFoundDecl(); 6649 if (PrevDecl->isTemplateParameter()) { 6650 // Maybe we will complain about the shadowed template parameter. 6651 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6652 // Just pretend that we didn't see the previous declaration. 6653 PrevDecl = 0; 6654 } else if (S->isDeclScope(PrevDecl)) { 6655 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6656 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6657 6658 // Recover by removing the name 6659 II = 0; 6660 D.SetIdentifier(0, D.getIdentifierLoc()); 6661 D.setInvalidType(true); 6662 } 6663 } 6664 } 6665 6666 // Temporarily put parameter variables in the translation unit, not 6667 // the enclosing context. This prevents them from accidentally 6668 // looking like class members in C++. 6669 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6670 D.getSourceRange().getBegin(), 6671 D.getIdentifierLoc(), II, 6672 parmDeclType, TInfo, 6673 StorageClass, StorageClassAsWritten); 6674 6675 if (D.isInvalidType()) 6676 New->setInvalidDecl(); 6677 6678 assert(S->isFunctionPrototypeScope()); 6679 assert(S->getFunctionPrototypeDepth() >= 1); 6680 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6681 S->getNextFunctionPrototypeIndex()); 6682 6683 // Add the parameter declaration into this scope. 6684 S->AddDecl(New); 6685 if (II) 6686 IdResolver.AddDecl(New); 6687 6688 ProcessDeclAttributes(S, New, D); 6689 6690 if (D.getDeclSpec().isModulePrivateSpecified()) 6691 Diag(New->getLocation(), diag::err_module_private_local) 6692 << 1 << New->getDeclName() 6693 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6694 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6695 6696 if (New->hasAttr<BlocksAttr>()) { 6697 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6698 } 6699 return New; 6700} 6701 6702/// \brief Synthesizes a variable for a parameter arising from a 6703/// typedef. 6704ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6705 SourceLocation Loc, 6706 QualType T) { 6707 /* FIXME: setting StartLoc == Loc. 6708 Would it be worth to modify callers so as to provide proper source 6709 location for the unnamed parameters, embedding the parameter's type? */ 6710 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6711 T, Context.getTrivialTypeSourceInfo(T, Loc), 6712 SC_None, SC_None, 0); 6713 Param->setImplicit(); 6714 return Param; 6715} 6716 6717void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6718 ParmVarDecl * const *ParamEnd) { 6719 // Don't diagnose unused-parameter errors in template instantiations; we 6720 // will already have done so in the template itself. 6721 if (!ActiveTemplateInstantiations.empty()) 6722 return; 6723 6724 for (; Param != ParamEnd; ++Param) { 6725 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6726 !(*Param)->hasAttr<UnusedAttr>()) { 6727 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6728 << (*Param)->getDeclName(); 6729 } 6730 } 6731} 6732 6733void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6734 ParmVarDecl * const *ParamEnd, 6735 QualType ReturnTy, 6736 NamedDecl *D) { 6737 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6738 return; 6739 6740 // Warn if the return value is pass-by-value and larger than the specified 6741 // threshold. 6742 if (ReturnTy.isPODType(Context)) { 6743 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6744 if (Size > LangOpts.NumLargeByValueCopy) 6745 Diag(D->getLocation(), diag::warn_return_value_size) 6746 << D->getDeclName() << Size; 6747 } 6748 6749 // Warn if any parameter is pass-by-value and larger than the specified 6750 // threshold. 6751 for (; Param != ParamEnd; ++Param) { 6752 QualType T = (*Param)->getType(); 6753 if (!T.isPODType(Context)) 6754 continue; 6755 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6756 if (Size > LangOpts.NumLargeByValueCopy) 6757 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6758 << (*Param)->getDeclName() << Size; 6759 } 6760} 6761 6762ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6763 SourceLocation NameLoc, IdentifierInfo *Name, 6764 QualType T, TypeSourceInfo *TSInfo, 6765 VarDecl::StorageClass StorageClass, 6766 VarDecl::StorageClass StorageClassAsWritten) { 6767 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6768 if (getLangOptions().ObjCAutoRefCount && 6769 T.getObjCLifetime() == Qualifiers::OCL_None && 6770 T->isObjCLifetimeType()) { 6771 6772 Qualifiers::ObjCLifetime lifetime; 6773 6774 // Special cases for arrays: 6775 // - if it's const, use __unsafe_unretained 6776 // - otherwise, it's an error 6777 if (T->isArrayType()) { 6778 if (!T.isConstQualified()) { 6779 DelayedDiagnostics.add( 6780 sema::DelayedDiagnostic::makeForbiddenType( 6781 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6782 } 6783 lifetime = Qualifiers::OCL_ExplicitNone; 6784 } else { 6785 lifetime = T->getObjCARCImplicitLifetime(); 6786 } 6787 T = Context.getLifetimeQualifiedType(T, lifetime); 6788 } 6789 6790 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6791 Context.getAdjustedParameterType(T), 6792 TSInfo, 6793 StorageClass, StorageClassAsWritten, 6794 0); 6795 6796 // Parameters can not be abstract class types. 6797 // For record types, this is done by the AbstractClassUsageDiagnoser once 6798 // the class has been completely parsed. 6799 if (!CurContext->isRecord() && 6800 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6801 AbstractParamType)) 6802 New->setInvalidDecl(); 6803 6804 // Parameter declarators cannot be interface types. All ObjC objects are 6805 // passed by reference. 6806 if (T->isObjCObjectType()) { 6807 Diag(NameLoc, 6808 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6809 << FixItHint::CreateInsertion(NameLoc, "*"); 6810 T = Context.getObjCObjectPointerType(T); 6811 New->setType(T); 6812 } 6813 6814 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6815 // duration shall not be qualified by an address-space qualifier." 6816 // Since all parameters have automatic store duration, they can not have 6817 // an address space. 6818 if (T.getAddressSpace() != 0) { 6819 Diag(NameLoc, diag::err_arg_with_address_space); 6820 New->setInvalidDecl(); 6821 } 6822 6823 return New; 6824} 6825 6826void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6827 SourceLocation LocAfterDecls) { 6828 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6829 6830 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6831 // for a K&R function. 6832 if (!FTI.hasPrototype) { 6833 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6834 --i; 6835 if (FTI.ArgInfo[i].Param == 0) { 6836 llvm::SmallString<256> Code; 6837 llvm::raw_svector_ostream(Code) << " int " 6838 << FTI.ArgInfo[i].Ident->getName() 6839 << ";\n"; 6840 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6841 << FTI.ArgInfo[i].Ident 6842 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6843 6844 // Implicitly declare the argument as type 'int' for lack of a better 6845 // type. 6846 AttributeFactory attrs; 6847 DeclSpec DS(attrs); 6848 const char* PrevSpec; // unused 6849 unsigned DiagID; // unused 6850 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6851 PrevSpec, DiagID); 6852 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6853 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6854 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6855 } 6856 } 6857 } 6858} 6859 6860Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6861 Declarator &D) { 6862 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6863 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6864 Scope *ParentScope = FnBodyScope->getParent(); 6865 6866 D.setFunctionDefinition(true); 6867 Decl *DP = HandleDeclarator(ParentScope, D, 6868 MultiTemplateParamsArg(*this)); 6869 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6870} 6871 6872static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6873 // Don't warn about invalid declarations. 6874 if (FD->isInvalidDecl()) 6875 return false; 6876 6877 // Or declarations that aren't global. 6878 if (!FD->isGlobal()) 6879 return false; 6880 6881 // Don't warn about C++ member functions. 6882 if (isa<CXXMethodDecl>(FD)) 6883 return false; 6884 6885 // Don't warn about 'main'. 6886 if (FD->isMain()) 6887 return false; 6888 6889 // Don't warn about inline functions. 6890 if (FD->isInlined()) 6891 return false; 6892 6893 // Don't warn about function templates. 6894 if (FD->getDescribedFunctionTemplate()) 6895 return false; 6896 6897 // Don't warn about function template specializations. 6898 if (FD->isFunctionTemplateSpecialization()) 6899 return false; 6900 6901 bool MissingPrototype = true; 6902 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6903 Prev; Prev = Prev->getPreviousDeclaration()) { 6904 // Ignore any declarations that occur in function or method 6905 // scope, because they aren't visible from the header. 6906 if (Prev->getDeclContext()->isFunctionOrMethod()) 6907 continue; 6908 6909 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6910 break; 6911 } 6912 6913 return MissingPrototype; 6914} 6915 6916void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6917 // Don't complain if we're in GNU89 mode and the previous definition 6918 // was an extern inline function. 6919 const FunctionDecl *Definition; 6920 if (FD->isDefined(Definition) && 6921 !canRedefineFunction(Definition, getLangOptions())) { 6922 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6923 Definition->getStorageClass() == SC_Extern) 6924 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6925 << FD->getDeclName() << getLangOptions().CPlusPlus; 6926 else 6927 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6928 Diag(Definition->getLocation(), diag::note_previous_definition); 6929 } 6930} 6931 6932Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6933 // Clear the last template instantiation error context. 6934 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6935 6936 if (!D) 6937 return D; 6938 FunctionDecl *FD = 0; 6939 6940 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6941 FD = FunTmpl->getTemplatedDecl(); 6942 else 6943 FD = cast<FunctionDecl>(D); 6944 6945 // Enter a new function scope 6946 PushFunctionScope(); 6947 6948 // See if this is a redefinition. 6949 if (!FD->isLateTemplateParsed()) 6950 CheckForFunctionRedefinition(FD); 6951 6952 // Builtin functions cannot be defined. 6953 if (unsigned BuiltinID = FD->getBuiltinID()) { 6954 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6955 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6956 FD->setInvalidDecl(); 6957 } 6958 } 6959 6960 // The return type of a function definition must be complete 6961 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6962 QualType ResultType = FD->getResultType(); 6963 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6964 !FD->isInvalidDecl() && 6965 RequireCompleteType(FD->getLocation(), ResultType, 6966 diag::err_func_def_incomplete_result)) 6967 FD->setInvalidDecl(); 6968 6969 // GNU warning -Wmissing-prototypes: 6970 // Warn if a global function is defined without a previous 6971 // prototype declaration. This warning is issued even if the 6972 // definition itself provides a prototype. The aim is to detect 6973 // global functions that fail to be declared in header files. 6974 if (ShouldWarnAboutMissingPrototype(FD)) 6975 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6976 6977 if (FnBodyScope) 6978 PushDeclContext(FnBodyScope, FD); 6979 6980 // Check the validity of our function parameters 6981 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6982 /*CheckParameterNames=*/true); 6983 6984 // Introduce our parameters into the function scope 6985 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6986 ParmVarDecl *Param = FD->getParamDecl(p); 6987 Param->setOwningFunction(FD); 6988 6989 // If this has an identifier, add it to the scope stack. 6990 if (Param->getIdentifier() && FnBodyScope) { 6991 CheckShadow(FnBodyScope, Param); 6992 6993 PushOnScopeChains(Param, FnBodyScope); 6994 } 6995 } 6996 6997 // Checking attributes of current function definition 6998 // dllimport attribute. 6999 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7000 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7001 // dllimport attribute cannot be directly applied to definition. 7002 // Microsoft accepts dllimport for functions defined within class scope. 7003 if (!DA->isInherited() && 7004 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7005 Diag(FD->getLocation(), 7006 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7007 << "dllimport"; 7008 FD->setInvalidDecl(); 7009 return FD; 7010 } 7011 7012 // Visual C++ appears to not think this is an issue, so only issue 7013 // a warning when Microsoft extensions are disabled. 7014 if (!LangOpts.MicrosoftExt) { 7015 // If a symbol previously declared dllimport is later defined, the 7016 // attribute is ignored in subsequent references, and a warning is 7017 // emitted. 7018 Diag(FD->getLocation(), 7019 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7020 << FD->getName() << "dllimport"; 7021 } 7022 } 7023 return FD; 7024} 7025 7026/// \brief Given the set of return statements within a function body, 7027/// compute the variables that are subject to the named return value 7028/// optimization. 7029/// 7030/// Each of the variables that is subject to the named return value 7031/// optimization will be marked as NRVO variables in the AST, and any 7032/// return statement that has a marked NRVO variable as its NRVO candidate can 7033/// use the named return value optimization. 7034/// 7035/// This function applies a very simplistic algorithm for NRVO: if every return 7036/// statement in the function has the same NRVO candidate, that candidate is 7037/// the NRVO variable. 7038/// 7039/// FIXME: Employ a smarter algorithm that accounts for multiple return 7040/// statements and the lifetimes of the NRVO candidates. We should be able to 7041/// find a maximal set of NRVO variables. 7042void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7043 ReturnStmt **Returns = Scope->Returns.data(); 7044 7045 const VarDecl *NRVOCandidate = 0; 7046 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7047 if (!Returns[I]->getNRVOCandidate()) 7048 return; 7049 7050 if (!NRVOCandidate) 7051 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7052 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7053 return; 7054 } 7055 7056 if (NRVOCandidate) 7057 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7058} 7059 7060Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7061 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7062} 7063 7064Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7065 bool IsInstantiation) { 7066 FunctionDecl *FD = 0; 7067 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7068 if (FunTmpl) 7069 FD = FunTmpl->getTemplatedDecl(); 7070 else 7071 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7072 7073 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7074 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7075 7076 if (FD) { 7077 FD->setBody(Body); 7078 if (FD->isMain()) { 7079 // C and C++ allow for main to automagically return 0. 7080 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7081 FD->setHasImplicitReturnZero(true); 7082 WP.disableCheckFallThrough(); 7083 } else if (FD->hasAttr<NakedAttr>()) { 7084 // If the function is marked 'naked', don't complain about missing return 7085 // statements. 7086 WP.disableCheckFallThrough(); 7087 } 7088 7089 // MSVC permits the use of pure specifier (=0) on function definition, 7090 // defined at class scope, warn about this non standard construct. 7091 if (getLangOptions().MicrosoftExt && FD->isPure()) 7092 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7093 7094 if (!FD->isInvalidDecl()) { 7095 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7096 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7097 FD->getResultType(), FD); 7098 7099 // If this is a constructor, we need a vtable. 7100 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7101 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7102 7103 computeNRVO(Body, getCurFunction()); 7104 } 7105 7106 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7107 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7108 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7109 MD->setBody(Body); 7110 if (Body) 7111 MD->setEndLoc(Body->getLocEnd()); 7112 if (!MD->isInvalidDecl()) { 7113 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7114 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7115 MD->getResultType(), MD); 7116 7117 if (Body) 7118 computeNRVO(Body, getCurFunction()); 7119 } 7120 if (ObjCShouldCallSuperDealloc) { 7121 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7122 ObjCShouldCallSuperDealloc = false; 7123 } 7124 if (ObjCShouldCallSuperFinalize) { 7125 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7126 ObjCShouldCallSuperFinalize = false; 7127 } 7128 } else { 7129 return 0; 7130 } 7131 7132 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7133 "ObjC methods, which should have been handled in the block above."); 7134 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7135 "ObjC methods, which should have been handled in the block above."); 7136 7137 // Verify and clean out per-function state. 7138 if (Body) { 7139 // C++ constructors that have function-try-blocks can't have return 7140 // statements in the handlers of that block. (C++ [except.handle]p14) 7141 // Verify this. 7142 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7143 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7144 7145 // Verify that gotos and switch cases don't jump into scopes illegally. 7146 if (getCurFunction()->NeedsScopeChecking() && 7147 !dcl->isInvalidDecl() && 7148 !hasAnyUnrecoverableErrorsInThisFunction()) 7149 DiagnoseInvalidJumps(Body); 7150 7151 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7152 if (!Destructor->getParent()->isDependentType()) 7153 CheckDestructor(Destructor); 7154 7155 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7156 Destructor->getParent()); 7157 } 7158 7159 // If any errors have occurred, clear out any temporaries that may have 7160 // been leftover. This ensures that these temporaries won't be picked up for 7161 // deletion in some later function. 7162 if (PP.getDiagnostics().hasErrorOccurred() || 7163 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7164 ExprTemporaries.clear(); 7165 ExprNeedsCleanups = false; 7166 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7167 // Since the body is valid, issue any analysis-based warnings that are 7168 // enabled. 7169 ActivePolicy = &WP; 7170 } 7171 7172 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7173 !CheckConstexprFunctionBody(FD, Body)) 7174 FD->setInvalidDecl(); 7175 7176 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7177 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7178 } 7179 7180 if (!IsInstantiation) 7181 PopDeclContext(); 7182 7183 PopFunctionOrBlockScope(ActivePolicy, dcl); 7184 7185 // If any errors have occurred, clear out any temporaries that may have 7186 // been leftover. This ensures that these temporaries won't be picked up for 7187 // deletion in some later function. 7188 if (getDiagnostics().hasErrorOccurred()) { 7189 ExprTemporaries.clear(); 7190 ExprNeedsCleanups = false; 7191 } 7192 7193 return dcl; 7194} 7195 7196 7197/// When we finish delayed parsing of an attribute, we must attach it to the 7198/// relevant Decl. 7199void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7200 ParsedAttributes &Attrs) { 7201 ProcessDeclAttributeList(S, D, Attrs.getList()); 7202} 7203 7204 7205/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7206/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7207NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7208 IdentifierInfo &II, Scope *S) { 7209 // Before we produce a declaration for an implicitly defined 7210 // function, see whether there was a locally-scoped declaration of 7211 // this name as a function or variable. If so, use that 7212 // (non-visible) declaration, and complain about it. 7213 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7214 = findLocallyScopedExternalDecl(&II); 7215 if (Pos != LocallyScopedExternalDecls.end()) { 7216 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7217 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7218 return Pos->second; 7219 } 7220 7221 // Extension in C99. Legal in C90, but warn about it. 7222 if (II.getName().startswith("__builtin_")) 7223 Diag(Loc, diag::warn_builtin_unknown) << &II; 7224 else if (getLangOptions().C99) 7225 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7226 else 7227 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7228 7229 // Set a Declarator for the implicit definition: int foo(); 7230 const char *Dummy; 7231 AttributeFactory attrFactory; 7232 DeclSpec DS(attrFactory); 7233 unsigned DiagID; 7234 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7235 (void)Error; // Silence warning. 7236 assert(!Error && "Error setting up implicit decl!"); 7237 Declarator D(DS, Declarator::BlockContext); 7238 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7239 0, 0, true, SourceLocation(), 7240 SourceLocation(), SourceLocation(), 7241 SourceLocation(), 7242 EST_None, SourceLocation(), 7243 0, 0, 0, 0, Loc, Loc, D), 7244 DS.getAttributes(), 7245 SourceLocation()); 7246 D.SetIdentifier(&II, Loc); 7247 7248 // Insert this function into translation-unit scope. 7249 7250 DeclContext *PrevDC = CurContext; 7251 CurContext = Context.getTranslationUnitDecl(); 7252 7253 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7254 FD->setImplicit(); 7255 7256 CurContext = PrevDC; 7257 7258 AddKnownFunctionAttributes(FD); 7259 7260 return FD; 7261} 7262 7263/// \brief Adds any function attributes that we know a priori based on 7264/// the declaration of this function. 7265/// 7266/// These attributes can apply both to implicitly-declared builtins 7267/// (like __builtin___printf_chk) or to library-declared functions 7268/// like NSLog or printf. 7269/// 7270/// We need to check for duplicate attributes both here and where user-written 7271/// attributes are applied to declarations. 7272void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7273 if (FD->isInvalidDecl()) 7274 return; 7275 7276 // If this is a built-in function, map its builtin attributes to 7277 // actual attributes. 7278 if (unsigned BuiltinID = FD->getBuiltinID()) { 7279 // Handle printf-formatting attributes. 7280 unsigned FormatIdx; 7281 bool HasVAListArg; 7282 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7283 if (!FD->getAttr<FormatAttr>()) 7284 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7285 "printf", FormatIdx+1, 7286 HasVAListArg ? 0 : FormatIdx+2)); 7287 } 7288 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7289 HasVAListArg)) { 7290 if (!FD->getAttr<FormatAttr>()) 7291 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7292 "scanf", FormatIdx+1, 7293 HasVAListArg ? 0 : FormatIdx+2)); 7294 } 7295 7296 // Mark const if we don't care about errno and that is the only 7297 // thing preventing the function from being const. This allows 7298 // IRgen to use LLVM intrinsics for such functions. 7299 if (!getLangOptions().MathErrno && 7300 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7301 if (!FD->getAttr<ConstAttr>()) 7302 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7303 } 7304 7305 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7306 !FD->getAttr<ReturnsTwiceAttr>()) 7307 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7308 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7309 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7310 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7311 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7312 } 7313 7314 IdentifierInfo *Name = FD->getIdentifier(); 7315 if (!Name) 7316 return; 7317 if ((!getLangOptions().CPlusPlus && 7318 FD->getDeclContext()->isTranslationUnit()) || 7319 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7320 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7321 LinkageSpecDecl::lang_c)) { 7322 // Okay: this could be a libc/libm/Objective-C function we know 7323 // about. 7324 } else 7325 return; 7326 7327 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7328 // FIXME: NSLog and NSLogv should be target specific 7329 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7330 // FIXME: We known better than our headers. 7331 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7332 } else 7333 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7334 "printf", 1, 7335 Name->isStr("NSLogv") ? 0 : 2)); 7336 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7337 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7338 // target-specific builtins, perhaps? 7339 if (!FD->getAttr<FormatAttr>()) 7340 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7341 "printf", 2, 7342 Name->isStr("vasprintf") ? 0 : 3)); 7343 } 7344} 7345 7346TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7347 TypeSourceInfo *TInfo) { 7348 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7349 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7350 7351 if (!TInfo) { 7352 assert(D.isInvalidType() && "no declarator info for valid type"); 7353 TInfo = Context.getTrivialTypeSourceInfo(T); 7354 } 7355 7356 // Scope manipulation handled by caller. 7357 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7358 D.getSourceRange().getBegin(), 7359 D.getIdentifierLoc(), 7360 D.getIdentifier(), 7361 TInfo); 7362 7363 // Bail out immediately if we have an invalid declaration. 7364 if (D.isInvalidType()) { 7365 NewTD->setInvalidDecl(); 7366 return NewTD; 7367 } 7368 7369 if (D.getDeclSpec().isModulePrivateSpecified()) { 7370 if (CurContext->isFunctionOrMethod()) 7371 Diag(NewTD->getLocation(), diag::err_module_private_local) 7372 << 2 << NewTD->getDeclName() 7373 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7374 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7375 else 7376 NewTD->setModulePrivate(); 7377 } 7378 7379 // C++ [dcl.typedef]p8: 7380 // If the typedef declaration defines an unnamed class (or 7381 // enum), the first typedef-name declared by the declaration 7382 // to be that class type (or enum type) is used to denote the 7383 // class type (or enum type) for linkage purposes only. 7384 // We need to check whether the type was declared in the declaration. 7385 switch (D.getDeclSpec().getTypeSpecType()) { 7386 case TST_enum: 7387 case TST_struct: 7388 case TST_union: 7389 case TST_class: { 7390 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7391 7392 // Do nothing if the tag is not anonymous or already has an 7393 // associated typedef (from an earlier typedef in this decl group). 7394 if (tagFromDeclSpec->getIdentifier()) break; 7395 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7396 7397 // A well-formed anonymous tag must always be a TUK_Definition. 7398 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7399 7400 // The type must match the tag exactly; no qualifiers allowed. 7401 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7402 break; 7403 7404 // Otherwise, set this is the anon-decl typedef for the tag. 7405 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7406 break; 7407 } 7408 7409 default: 7410 break; 7411 } 7412 7413 return NewTD; 7414} 7415 7416 7417/// \brief Determine whether a tag with a given kind is acceptable 7418/// as a redeclaration of the given tag declaration. 7419/// 7420/// \returns true if the new tag kind is acceptable, false otherwise. 7421bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7422 TagTypeKind NewTag, bool isDefinition, 7423 SourceLocation NewTagLoc, 7424 const IdentifierInfo &Name) { 7425 // C++ [dcl.type.elab]p3: 7426 // The class-key or enum keyword present in the 7427 // elaborated-type-specifier shall agree in kind with the 7428 // declaration to which the name in the elaborated-type-specifier 7429 // refers. This rule also applies to the form of 7430 // elaborated-type-specifier that declares a class-name or 7431 // friend class since it can be construed as referring to the 7432 // definition of the class. Thus, in any 7433 // elaborated-type-specifier, the enum keyword shall be used to 7434 // refer to an enumeration (7.2), the union class-key shall be 7435 // used to refer to a union (clause 9), and either the class or 7436 // struct class-key shall be used to refer to a class (clause 9) 7437 // declared using the class or struct class-key. 7438 TagTypeKind OldTag = Previous->getTagKind(); 7439 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7440 if (OldTag == NewTag) 7441 return true; 7442 7443 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7444 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7445 // Warn about the struct/class tag mismatch. 7446 bool isTemplate = false; 7447 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7448 isTemplate = Record->getDescribedClassTemplate(); 7449 7450 if (!ActiveTemplateInstantiations.empty()) { 7451 // In a template instantiation, do not offer fix-its for tag mismatches 7452 // since they usually mess up the template instead of fixing the problem. 7453 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7454 << (NewTag == TTK_Class) << isTemplate << &Name; 7455 return true; 7456 } 7457 7458 if (isDefinition) { 7459 // On definitions, check previous tags and issue a fix-it for each 7460 // one that doesn't match the current tag. 7461 if (Previous->getDefinition()) { 7462 // Don't suggest fix-its for redefinitions. 7463 return true; 7464 } 7465 7466 bool previousMismatch = false; 7467 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7468 E(Previous->redecls_end()); I != E; ++I) { 7469 if (I->getTagKind() != NewTag) { 7470 if (!previousMismatch) { 7471 previousMismatch = true; 7472 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7473 << (NewTag == TTK_Class) << isTemplate << &Name; 7474 } 7475 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7476 << (NewTag == TTK_Class) 7477 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7478 NewTag == TTK_Class? 7479 "class" : "struct"); 7480 } 7481 } 7482 return true; 7483 } 7484 7485 // Check for a previous definition. If current tag and definition 7486 // are same type, do nothing. If no definition, but disagree with 7487 // with previous tag type, give a warning, but no fix-it. 7488 const TagDecl *Redecl = Previous->getDefinition() ? 7489 Previous->getDefinition() : Previous; 7490 if (Redecl->getTagKind() == NewTag) { 7491 return true; 7492 } 7493 7494 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7495 << (NewTag == TTK_Class) 7496 << isTemplate << &Name; 7497 Diag(Redecl->getLocation(), diag::note_previous_use); 7498 7499 // If there is a previous defintion, suggest a fix-it. 7500 if (Previous->getDefinition()) { 7501 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7502 << (Redecl->getTagKind() == TTK_Class) 7503 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7504 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7505 } 7506 7507 return true; 7508 } 7509 return false; 7510} 7511 7512/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7513/// former case, Name will be non-null. In the later case, Name will be null. 7514/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7515/// reference/declaration/definition of a tag. 7516Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7517 SourceLocation KWLoc, CXXScopeSpec &SS, 7518 IdentifierInfo *Name, SourceLocation NameLoc, 7519 AttributeList *Attr, AccessSpecifier AS, 7520 SourceLocation ModulePrivateLoc, 7521 MultiTemplateParamsArg TemplateParameterLists, 7522 bool &OwnedDecl, bool &IsDependent, 7523 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7524 TypeResult UnderlyingType) { 7525 // If this is not a definition, it must have a name. 7526 assert((Name != 0 || TUK == TUK_Definition) && 7527 "Nameless record must be a definition!"); 7528 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7529 7530 OwnedDecl = false; 7531 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7532 7533 // FIXME: Check explicit specializations more carefully. 7534 bool isExplicitSpecialization = false; 7535 bool Invalid = false; 7536 7537 // We only need to do this matching if we have template parameters 7538 // or a scope specifier, which also conveniently avoids this work 7539 // for non-C++ cases. 7540 if (TemplateParameterLists.size() > 0 || 7541 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7542 if (TemplateParameterList *TemplateParams 7543 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7544 TemplateParameterLists.get(), 7545 TemplateParameterLists.size(), 7546 TUK == TUK_Friend, 7547 isExplicitSpecialization, 7548 Invalid)) { 7549 if (TemplateParams->size() > 0) { 7550 // This is a declaration or definition of a class template (which may 7551 // be a member of another template). 7552 7553 if (Invalid) 7554 return 0; 7555 7556 OwnedDecl = false; 7557 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7558 SS, Name, NameLoc, Attr, 7559 TemplateParams, AS, 7560 ModulePrivateLoc, 7561 TemplateParameterLists.size() - 1, 7562 (TemplateParameterList**) TemplateParameterLists.release()); 7563 return Result.get(); 7564 } else { 7565 // The "template<>" header is extraneous. 7566 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7567 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7568 isExplicitSpecialization = true; 7569 } 7570 } 7571 } 7572 7573 // Figure out the underlying type if this a enum declaration. We need to do 7574 // this early, because it's needed to detect if this is an incompatible 7575 // redeclaration. 7576 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7577 7578 if (Kind == TTK_Enum) { 7579 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7580 // No underlying type explicitly specified, or we failed to parse the 7581 // type, default to int. 7582 EnumUnderlying = Context.IntTy.getTypePtr(); 7583 else if (UnderlyingType.get()) { 7584 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7585 // integral type; any cv-qualification is ignored. 7586 TypeSourceInfo *TI = 0; 7587 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7588 EnumUnderlying = TI; 7589 7590 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7591 7592 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7593 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7594 << T; 7595 // Recover by falling back to int. 7596 EnumUnderlying = Context.IntTy.getTypePtr(); 7597 } 7598 7599 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7600 UPPC_FixedUnderlyingType)) 7601 EnumUnderlying = Context.IntTy.getTypePtr(); 7602 7603 } else if (getLangOptions().MicrosoftExt) 7604 // Microsoft enums are always of int type. 7605 EnumUnderlying = Context.IntTy.getTypePtr(); 7606 } 7607 7608 DeclContext *SearchDC = CurContext; 7609 DeclContext *DC = CurContext; 7610 bool isStdBadAlloc = false; 7611 7612 RedeclarationKind Redecl = ForRedeclaration; 7613 if (TUK == TUK_Friend || TUK == TUK_Reference) 7614 Redecl = NotForRedeclaration; 7615 7616 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7617 7618 if (Name && SS.isNotEmpty()) { 7619 // We have a nested-name tag ('struct foo::bar'). 7620 7621 // Check for invalid 'foo::'. 7622 if (SS.isInvalid()) { 7623 Name = 0; 7624 goto CreateNewDecl; 7625 } 7626 7627 // If this is a friend or a reference to a class in a dependent 7628 // context, don't try to make a decl for it. 7629 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7630 DC = computeDeclContext(SS, false); 7631 if (!DC) { 7632 IsDependent = true; 7633 return 0; 7634 } 7635 } else { 7636 DC = computeDeclContext(SS, true); 7637 if (!DC) { 7638 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7639 << SS.getRange(); 7640 return 0; 7641 } 7642 } 7643 7644 if (RequireCompleteDeclContext(SS, DC)) 7645 return 0; 7646 7647 SearchDC = DC; 7648 // Look-up name inside 'foo::'. 7649 LookupQualifiedName(Previous, DC); 7650 7651 if (Previous.isAmbiguous()) 7652 return 0; 7653 7654 if (Previous.empty()) { 7655 // Name lookup did not find anything. However, if the 7656 // nested-name-specifier refers to the current instantiation, 7657 // and that current instantiation has any dependent base 7658 // classes, we might find something at instantiation time: treat 7659 // this as a dependent elaborated-type-specifier. 7660 // But this only makes any sense for reference-like lookups. 7661 if (Previous.wasNotFoundInCurrentInstantiation() && 7662 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7663 IsDependent = true; 7664 return 0; 7665 } 7666 7667 // A tag 'foo::bar' must already exist. 7668 Diag(NameLoc, diag::err_not_tag_in_scope) 7669 << Kind << Name << DC << SS.getRange(); 7670 Name = 0; 7671 Invalid = true; 7672 goto CreateNewDecl; 7673 } 7674 } else if (Name) { 7675 // If this is a named struct, check to see if there was a previous forward 7676 // declaration or definition. 7677 // FIXME: We're looking into outer scopes here, even when we 7678 // shouldn't be. Doing so can result in ambiguities that we 7679 // shouldn't be diagnosing. 7680 LookupName(Previous, S); 7681 7682 if (Previous.isAmbiguous() && 7683 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7684 LookupResult::Filter F = Previous.makeFilter(); 7685 while (F.hasNext()) { 7686 NamedDecl *ND = F.next(); 7687 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7688 F.erase(); 7689 } 7690 F.done(); 7691 } 7692 7693 // Note: there used to be some attempt at recovery here. 7694 if (Previous.isAmbiguous()) 7695 return 0; 7696 7697 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7698 // FIXME: This makes sure that we ignore the contexts associated 7699 // with C structs, unions, and enums when looking for a matching 7700 // tag declaration or definition. See the similar lookup tweak 7701 // in Sema::LookupName; is there a better way to deal with this? 7702 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7703 SearchDC = SearchDC->getParent(); 7704 } 7705 } else if (S->isFunctionPrototypeScope()) { 7706 // If this is an enum declaration in function prototype scope, set its 7707 // initial context to the translation unit. 7708 SearchDC = Context.getTranslationUnitDecl(); 7709 } 7710 7711 if (Previous.isSingleResult() && 7712 Previous.getFoundDecl()->isTemplateParameter()) { 7713 // Maybe we will complain about the shadowed template parameter. 7714 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7715 // Just pretend that we didn't see the previous declaration. 7716 Previous.clear(); 7717 } 7718 7719 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7720 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7721 // This is a declaration of or a reference to "std::bad_alloc". 7722 isStdBadAlloc = true; 7723 7724 if (Previous.empty() && StdBadAlloc) { 7725 // std::bad_alloc has been implicitly declared (but made invisible to 7726 // name lookup). Fill in this implicit declaration as the previous 7727 // declaration, so that the declarations get chained appropriately. 7728 Previous.addDecl(getStdBadAlloc()); 7729 } 7730 } 7731 7732 // If we didn't find a previous declaration, and this is a reference 7733 // (or friend reference), move to the correct scope. In C++, we 7734 // also need to do a redeclaration lookup there, just in case 7735 // there's a shadow friend decl. 7736 if (Name && Previous.empty() && 7737 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7738 if (Invalid) goto CreateNewDecl; 7739 assert(SS.isEmpty()); 7740 7741 if (TUK == TUK_Reference) { 7742 // C++ [basic.scope.pdecl]p5: 7743 // -- for an elaborated-type-specifier of the form 7744 // 7745 // class-key identifier 7746 // 7747 // if the elaborated-type-specifier is used in the 7748 // decl-specifier-seq or parameter-declaration-clause of a 7749 // function defined in namespace scope, the identifier is 7750 // declared as a class-name in the namespace that contains 7751 // the declaration; otherwise, except as a friend 7752 // declaration, the identifier is declared in the smallest 7753 // non-class, non-function-prototype scope that contains the 7754 // declaration. 7755 // 7756 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7757 // C structs and unions. 7758 // 7759 // It is an error in C++ to declare (rather than define) an enum 7760 // type, including via an elaborated type specifier. We'll 7761 // diagnose that later; for now, declare the enum in the same 7762 // scope as we would have picked for any other tag type. 7763 // 7764 // GNU C also supports this behavior as part of its incomplete 7765 // enum types extension, while GNU C++ does not. 7766 // 7767 // Find the context where we'll be declaring the tag. 7768 // FIXME: We would like to maintain the current DeclContext as the 7769 // lexical context, 7770 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7771 SearchDC = SearchDC->getParent(); 7772 7773 // Find the scope where we'll be declaring the tag. 7774 while (S->isClassScope() || 7775 (getLangOptions().CPlusPlus && 7776 S->isFunctionPrototypeScope()) || 7777 ((S->getFlags() & Scope::DeclScope) == 0) || 7778 (S->getEntity() && 7779 ((DeclContext *)S->getEntity())->isTransparentContext())) 7780 S = S->getParent(); 7781 } else { 7782 assert(TUK == TUK_Friend); 7783 // C++ [namespace.memdef]p3: 7784 // If a friend declaration in a non-local class first declares a 7785 // class or function, the friend class or function is a member of 7786 // the innermost enclosing namespace. 7787 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7788 } 7789 7790 // In C++, we need to do a redeclaration lookup to properly 7791 // diagnose some problems. 7792 if (getLangOptions().CPlusPlus) { 7793 Previous.setRedeclarationKind(ForRedeclaration); 7794 LookupQualifiedName(Previous, SearchDC); 7795 } 7796 } 7797 7798 if (!Previous.empty()) { 7799 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7800 7801 // It's okay to have a tag decl in the same scope as a typedef 7802 // which hides a tag decl in the same scope. Finding this 7803 // insanity with a redeclaration lookup can only actually happen 7804 // in C++. 7805 // 7806 // This is also okay for elaborated-type-specifiers, which is 7807 // technically forbidden by the current standard but which is 7808 // okay according to the likely resolution of an open issue; 7809 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7810 if (getLangOptions().CPlusPlus) { 7811 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7812 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7813 TagDecl *Tag = TT->getDecl(); 7814 if (Tag->getDeclName() == Name && 7815 Tag->getDeclContext()->getRedeclContext() 7816 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7817 PrevDecl = Tag; 7818 Previous.clear(); 7819 Previous.addDecl(Tag); 7820 Previous.resolveKind(); 7821 } 7822 } 7823 } 7824 } 7825 7826 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7827 // If this is a use of a previous tag, or if the tag is already declared 7828 // in the same scope (so that the definition/declaration completes or 7829 // rementions the tag), reuse the decl. 7830 if (TUK == TUK_Reference || TUK == TUK_Friend || 7831 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7832 // Make sure that this wasn't declared as an enum and now used as a 7833 // struct or something similar. 7834 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7835 TUK == TUK_Definition, KWLoc, 7836 *Name)) { 7837 bool SafeToContinue 7838 = (PrevTagDecl->getTagKind() != TTK_Enum && 7839 Kind != TTK_Enum); 7840 if (SafeToContinue) 7841 Diag(KWLoc, diag::err_use_with_wrong_tag) 7842 << Name 7843 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7844 PrevTagDecl->getKindName()); 7845 else 7846 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7847 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7848 7849 if (SafeToContinue) 7850 Kind = PrevTagDecl->getTagKind(); 7851 else { 7852 // Recover by making this an anonymous redefinition. 7853 Name = 0; 7854 Previous.clear(); 7855 Invalid = true; 7856 } 7857 } 7858 7859 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7860 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7861 7862 // All conflicts with previous declarations are recovered by 7863 // returning the previous declaration. 7864 if (ScopedEnum != PrevEnum->isScoped()) { 7865 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7866 << PrevEnum->isScoped(); 7867 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7868 return PrevTagDecl; 7869 } 7870 else if (EnumUnderlying && PrevEnum->isFixed()) { 7871 QualType T; 7872 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7873 T = TI->getType(); 7874 else 7875 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7876 7877 if (!Context.hasSameUnqualifiedType(T, 7878 PrevEnum->getIntegerType())) { 7879 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7880 diag::err_enum_redeclare_type_mismatch) 7881 << T 7882 << PrevEnum->getIntegerType(); 7883 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7884 return PrevTagDecl; 7885 } 7886 } 7887 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7888 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7889 << PrevEnum->isFixed(); 7890 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7891 return PrevTagDecl; 7892 } 7893 } 7894 7895 if (!Invalid) { 7896 // If this is a use, just return the declaration we found. 7897 7898 // FIXME: In the future, return a variant or some other clue 7899 // for the consumer of this Decl to know it doesn't own it. 7900 // For our current ASTs this shouldn't be a problem, but will 7901 // need to be changed with DeclGroups. 7902 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7903 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7904 return PrevTagDecl; 7905 7906 // Diagnose attempts to redefine a tag. 7907 if (TUK == TUK_Definition) { 7908 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7909 // If we're defining a specialization and the previous definition 7910 // is from an implicit instantiation, don't emit an error 7911 // here; we'll catch this in the general case below. 7912 if (!isExplicitSpecialization || 7913 !isa<CXXRecordDecl>(Def) || 7914 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7915 == TSK_ExplicitSpecialization) { 7916 Diag(NameLoc, diag::err_redefinition) << Name; 7917 Diag(Def->getLocation(), diag::note_previous_definition); 7918 // If this is a redefinition, recover by making this 7919 // struct be anonymous, which will make any later 7920 // references get the previous definition. 7921 Name = 0; 7922 Previous.clear(); 7923 Invalid = true; 7924 } 7925 } else { 7926 // If the type is currently being defined, complain 7927 // about a nested redefinition. 7928 const TagType *Tag 7929 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7930 if (Tag->isBeingDefined()) { 7931 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7932 Diag(PrevTagDecl->getLocation(), 7933 diag::note_previous_definition); 7934 Name = 0; 7935 Previous.clear(); 7936 Invalid = true; 7937 } 7938 } 7939 7940 // Okay, this is definition of a previously declared or referenced 7941 // tag PrevDecl. We're going to create a new Decl for it. 7942 } 7943 } 7944 // If we get here we have (another) forward declaration or we 7945 // have a definition. Just create a new decl. 7946 7947 } else { 7948 // If we get here, this is a definition of a new tag type in a nested 7949 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7950 // new decl/type. We set PrevDecl to NULL so that the entities 7951 // have distinct types. 7952 Previous.clear(); 7953 } 7954 // If we get here, we're going to create a new Decl. If PrevDecl 7955 // is non-NULL, it's a definition of the tag declared by 7956 // PrevDecl. If it's NULL, we have a new definition. 7957 7958 7959 // Otherwise, PrevDecl is not a tag, but was found with tag 7960 // lookup. This is only actually possible in C++, where a few 7961 // things like templates still live in the tag namespace. 7962 } else { 7963 assert(getLangOptions().CPlusPlus); 7964 7965 // Use a better diagnostic if an elaborated-type-specifier 7966 // found the wrong kind of type on the first 7967 // (non-redeclaration) lookup. 7968 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7969 !Previous.isForRedeclaration()) { 7970 unsigned Kind = 0; 7971 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7972 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7973 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7974 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7975 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7976 Invalid = true; 7977 7978 // Otherwise, only diagnose if the declaration is in scope. 7979 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7980 isExplicitSpecialization)) { 7981 // do nothing 7982 7983 // Diagnose implicit declarations introduced by elaborated types. 7984 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7985 unsigned Kind = 0; 7986 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7987 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7988 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7989 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7990 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7991 Invalid = true; 7992 7993 // Otherwise it's a declaration. Call out a particularly common 7994 // case here. 7995 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7996 unsigned Kind = 0; 7997 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7998 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7999 << Name << Kind << TND->getUnderlyingType(); 8000 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8001 Invalid = true; 8002 8003 // Otherwise, diagnose. 8004 } else { 8005 // The tag name clashes with something else in the target scope, 8006 // issue an error and recover by making this tag be anonymous. 8007 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8008 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8009 Name = 0; 8010 Invalid = true; 8011 } 8012 8013 // The existing declaration isn't relevant to us; we're in a 8014 // new scope, so clear out the previous declaration. 8015 Previous.clear(); 8016 } 8017 } 8018 8019CreateNewDecl: 8020 8021 TagDecl *PrevDecl = 0; 8022 if (Previous.isSingleResult()) 8023 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8024 8025 // If there is an identifier, use the location of the identifier as the 8026 // location of the decl, otherwise use the location of the struct/union 8027 // keyword. 8028 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8029 8030 // Otherwise, create a new declaration. If there is a previous 8031 // declaration of the same entity, the two will be linked via 8032 // PrevDecl. 8033 TagDecl *New; 8034 8035 bool IsForwardReference = false; 8036 if (Kind == TTK_Enum) { 8037 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8038 // enum X { A, B, C } D; D should chain to X. 8039 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8040 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8041 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8042 // If this is an undefined enum, warn. 8043 if (TUK != TUK_Definition && !Invalid) { 8044 TagDecl *Def; 8045 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8046 // C++0x: 7.2p2: opaque-enum-declaration. 8047 // Conflicts are diagnosed above. Do nothing. 8048 } 8049 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8050 Diag(Loc, diag::ext_forward_ref_enum_def) 8051 << New; 8052 Diag(Def->getLocation(), diag::note_previous_definition); 8053 } else { 8054 unsigned DiagID = diag::ext_forward_ref_enum; 8055 if (getLangOptions().MicrosoftExt) 8056 DiagID = diag::ext_ms_forward_ref_enum; 8057 else if (getLangOptions().CPlusPlus) 8058 DiagID = diag::err_forward_ref_enum; 8059 Diag(Loc, DiagID); 8060 8061 // If this is a forward-declared reference to an enumeration, make a 8062 // note of it; we won't actually be introducing the declaration into 8063 // the declaration context. 8064 if (TUK == TUK_Reference) 8065 IsForwardReference = true; 8066 } 8067 } 8068 8069 if (EnumUnderlying) { 8070 EnumDecl *ED = cast<EnumDecl>(New); 8071 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8072 ED->setIntegerTypeSourceInfo(TI); 8073 else 8074 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8075 ED->setPromotionType(ED->getIntegerType()); 8076 } 8077 8078 } else { 8079 // struct/union/class 8080 8081 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8082 // struct X { int A; } D; D should chain to X. 8083 if (getLangOptions().CPlusPlus) { 8084 // FIXME: Look for a way to use RecordDecl for simple structs. 8085 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8086 cast_or_null<CXXRecordDecl>(PrevDecl)); 8087 8088 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8089 StdBadAlloc = cast<CXXRecordDecl>(New); 8090 } else 8091 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8092 cast_or_null<RecordDecl>(PrevDecl)); 8093 } 8094 8095 // Maybe add qualifier info. 8096 if (SS.isNotEmpty()) { 8097 if (SS.isSet()) { 8098 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8099 if (TemplateParameterLists.size() > 0) { 8100 New->setTemplateParameterListsInfo(Context, 8101 TemplateParameterLists.size(), 8102 (TemplateParameterList**) TemplateParameterLists.release()); 8103 } 8104 } 8105 else 8106 Invalid = true; 8107 } 8108 8109 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8110 // Add alignment attributes if necessary; these attributes are checked when 8111 // the ASTContext lays out the structure. 8112 // 8113 // It is important for implementing the correct semantics that this 8114 // happen here (in act on tag decl). The #pragma pack stack is 8115 // maintained as a result of parser callbacks which can occur at 8116 // many points during the parsing of a struct declaration (because 8117 // the #pragma tokens are effectively skipped over during the 8118 // parsing of the struct). 8119 AddAlignmentAttributesForRecord(RD); 8120 8121 AddMsStructLayoutForRecord(RD); 8122 } 8123 8124 if (PrevDecl && PrevDecl->isModulePrivate()) 8125 New->setModulePrivate(); 8126 else if (ModulePrivateLoc.isValid()) { 8127 if (isExplicitSpecialization) 8128 Diag(New->getLocation(), diag::err_module_private_specialization) 8129 << 2 8130 << FixItHint::CreateRemoval(ModulePrivateLoc); 8131 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8132 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8133 // __module_private__ does not apply to local classes. However, we only 8134 // diagnose this as an error when the declaration specifiers are 8135 // freestanding. Here, we just ignore the __module_private__. 8136 // foobar 8137 else if (!SearchDC->isFunctionOrMethod()) 8138 New->setModulePrivate(); 8139 } 8140 8141 // If this is a specialization of a member class (of a class template), 8142 // check the specialization. 8143 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8144 Invalid = true; 8145 8146 if (Invalid) 8147 New->setInvalidDecl(); 8148 8149 if (Attr) 8150 ProcessDeclAttributeList(S, New, Attr); 8151 8152 // If we're declaring or defining a tag in function prototype scope 8153 // in C, note that this type can only be used within the function. 8154 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8155 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8156 8157 // Set the lexical context. If the tag has a C++ scope specifier, the 8158 // lexical context will be different from the semantic context. 8159 New->setLexicalDeclContext(CurContext); 8160 8161 // Mark this as a friend decl if applicable. 8162 // In Microsoft mode, a friend declaration also acts as a forward 8163 // declaration so we always pass true to setObjectOfFriendDecl to make 8164 // the tag name visible. 8165 if (TUK == TUK_Friend) 8166 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8167 getLangOptions().MicrosoftExt); 8168 8169 // Set the access specifier. 8170 if (!Invalid && SearchDC->isRecord()) 8171 SetMemberAccessSpecifier(New, PrevDecl, AS); 8172 8173 if (TUK == TUK_Definition) 8174 New->startDefinition(); 8175 8176 // If this has an identifier, add it to the scope stack. 8177 if (TUK == TUK_Friend) { 8178 // We might be replacing an existing declaration in the lookup tables; 8179 // if so, borrow its access specifier. 8180 if (PrevDecl) 8181 New->setAccess(PrevDecl->getAccess()); 8182 8183 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8184 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8185 if (Name) // can be null along some error paths 8186 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8187 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8188 } else if (Name) { 8189 S = getNonFieldDeclScope(S); 8190 PushOnScopeChains(New, S, !IsForwardReference); 8191 if (IsForwardReference) 8192 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8193 8194 } else { 8195 CurContext->addDecl(New); 8196 } 8197 8198 // If this is the C FILE type, notify the AST context. 8199 if (IdentifierInfo *II = New->getIdentifier()) 8200 if (!New->isInvalidDecl() && 8201 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8202 II->isStr("FILE")) 8203 Context.setFILEDecl(New); 8204 8205 OwnedDecl = true; 8206 return New; 8207} 8208 8209void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8210 AdjustDeclIfTemplate(TagD); 8211 TagDecl *Tag = cast<TagDecl>(TagD); 8212 8213 // Enter the tag context. 8214 PushDeclContext(S, Tag); 8215} 8216 8217Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8218 assert(isa<ObjCContainerDecl>(IDecl) && 8219 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8220 DeclContext *OCD = cast<DeclContext>(IDecl); 8221 assert(getContainingDC(OCD) == CurContext && 8222 "The next DeclContext should be lexically contained in the current one."); 8223 CurContext = OCD; 8224 return IDecl; 8225} 8226 8227void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8228 SourceLocation FinalLoc, 8229 SourceLocation LBraceLoc) { 8230 AdjustDeclIfTemplate(TagD); 8231 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8232 8233 FieldCollector->StartClass(); 8234 8235 if (!Record->getIdentifier()) 8236 return; 8237 8238 if (FinalLoc.isValid()) 8239 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8240 8241 // C++ [class]p2: 8242 // [...] The class-name is also inserted into the scope of the 8243 // class itself; this is known as the injected-class-name. For 8244 // purposes of access checking, the injected-class-name is treated 8245 // as if it were a public member name. 8246 CXXRecordDecl *InjectedClassName 8247 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8248 Record->getLocStart(), Record->getLocation(), 8249 Record->getIdentifier(), 8250 /*PrevDecl=*/0, 8251 /*DelayTypeCreation=*/true); 8252 Context.getTypeDeclType(InjectedClassName, Record); 8253 InjectedClassName->setImplicit(); 8254 InjectedClassName->setAccess(AS_public); 8255 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8256 InjectedClassName->setDescribedClassTemplate(Template); 8257 PushOnScopeChains(InjectedClassName, S); 8258 assert(InjectedClassName->isInjectedClassName() && 8259 "Broken injected-class-name"); 8260} 8261 8262void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8263 SourceLocation RBraceLoc) { 8264 AdjustDeclIfTemplate(TagD); 8265 TagDecl *Tag = cast<TagDecl>(TagD); 8266 Tag->setRBraceLoc(RBraceLoc); 8267 8268 if (isa<CXXRecordDecl>(Tag)) 8269 FieldCollector->FinishClass(); 8270 8271 // Exit this scope of this tag's definition. 8272 PopDeclContext(); 8273 8274 // Notify the consumer that we've defined a tag. 8275 Consumer.HandleTagDeclDefinition(Tag); 8276} 8277 8278void Sema::ActOnObjCContainerFinishDefinition() { 8279 // Exit this scope of this interface definition. 8280 PopDeclContext(); 8281} 8282 8283void Sema::ActOnObjCTemporaryExitContainerContext() { 8284 OriginalLexicalContext = CurContext; 8285 ActOnObjCContainerFinishDefinition(); 8286} 8287 8288void Sema::ActOnObjCReenterContainerContext() { 8289 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8290 OriginalLexicalContext = 0; 8291} 8292 8293void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8294 AdjustDeclIfTemplate(TagD); 8295 TagDecl *Tag = cast<TagDecl>(TagD); 8296 Tag->setInvalidDecl(); 8297 8298 // We're undoing ActOnTagStartDefinition here, not 8299 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8300 // the FieldCollector. 8301 8302 PopDeclContext(); 8303} 8304 8305// Note that FieldName may be null for anonymous bitfields. 8306bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8307 QualType FieldTy, const Expr *BitWidth, 8308 bool *ZeroWidth) { 8309 // Default to true; that shouldn't confuse checks for emptiness 8310 if (ZeroWidth) 8311 *ZeroWidth = true; 8312 8313 // C99 6.7.2.1p4 - verify the field type. 8314 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8315 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8316 // Handle incomplete types with specific error. 8317 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8318 return true; 8319 if (FieldName) 8320 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8321 << FieldName << FieldTy << BitWidth->getSourceRange(); 8322 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8323 << FieldTy << BitWidth->getSourceRange(); 8324 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8325 UPPC_BitFieldWidth)) 8326 return true; 8327 8328 // If the bit-width is type- or value-dependent, don't try to check 8329 // it now. 8330 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8331 return false; 8332 8333 llvm::APSInt Value; 8334 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8335 return true; 8336 8337 if (Value != 0 && ZeroWidth) 8338 *ZeroWidth = false; 8339 8340 // Zero-width bitfield is ok for anonymous field. 8341 if (Value == 0 && FieldName) 8342 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8343 8344 if (Value.isSigned() && Value.isNegative()) { 8345 if (FieldName) 8346 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8347 << FieldName << Value.toString(10); 8348 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8349 << Value.toString(10); 8350 } 8351 8352 if (!FieldTy->isDependentType()) { 8353 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8354 if (Value.getZExtValue() > TypeSize) { 8355 if (!getLangOptions().CPlusPlus) { 8356 if (FieldName) 8357 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8358 << FieldName << (unsigned)Value.getZExtValue() 8359 << (unsigned)TypeSize; 8360 8361 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8362 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8363 } 8364 8365 if (FieldName) 8366 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8367 << FieldName << (unsigned)Value.getZExtValue() 8368 << (unsigned)TypeSize; 8369 else 8370 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8371 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8372 } 8373 } 8374 8375 return false; 8376} 8377 8378/// ActOnField - Each field of a C struct/union is passed into this in order 8379/// to create a FieldDecl object for it. 8380Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8381 Declarator &D, Expr *BitfieldWidth) { 8382 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8383 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8384 /*HasInit=*/false, AS_public); 8385 return Res; 8386} 8387 8388/// HandleField - Analyze a field of a C struct or a C++ data member. 8389/// 8390FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8391 SourceLocation DeclStart, 8392 Declarator &D, Expr *BitWidth, bool HasInit, 8393 AccessSpecifier AS) { 8394 IdentifierInfo *II = D.getIdentifier(); 8395 SourceLocation Loc = DeclStart; 8396 if (II) Loc = D.getIdentifierLoc(); 8397 8398 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8399 QualType T = TInfo->getType(); 8400 if (getLangOptions().CPlusPlus) { 8401 CheckExtraCXXDefaultArguments(D); 8402 8403 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8404 UPPC_DataMemberType)) { 8405 D.setInvalidType(); 8406 T = Context.IntTy; 8407 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8408 } 8409 } 8410 8411 DiagnoseFunctionSpecifiers(D); 8412 8413 if (D.getDeclSpec().isThreadSpecified()) 8414 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8415 if (D.getDeclSpec().isConstexprSpecified()) 8416 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8417 << 2; 8418 8419 // Check to see if this name was declared as a member previously 8420 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8421 LookupName(Previous, S); 8422 assert((Previous.empty() || Previous.isOverloadedResult() || 8423 Previous.isSingleResult()) 8424 && "Lookup of member name should be either overloaded, single or null"); 8425 8426 // If the name is overloaded then get any declaration else get the single 8427 // result 8428 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8429 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8430 8431 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8432 // Maybe we will complain about the shadowed template parameter. 8433 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8434 // Just pretend that we didn't see the previous declaration. 8435 PrevDecl = 0; 8436 } 8437 8438 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8439 PrevDecl = 0; 8440 8441 bool Mutable 8442 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8443 SourceLocation TSSL = D.getSourceRange().getBegin(); 8444 FieldDecl *NewFD 8445 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8446 TSSL, AS, PrevDecl, &D); 8447 8448 if (NewFD->isInvalidDecl()) 8449 Record->setInvalidDecl(); 8450 8451 if (D.getDeclSpec().isModulePrivateSpecified()) 8452 NewFD->setModulePrivate(); 8453 8454 if (NewFD->isInvalidDecl() && PrevDecl) { 8455 // Don't introduce NewFD into scope; there's already something 8456 // with the same name in the same scope. 8457 } else if (II) { 8458 PushOnScopeChains(NewFD, S); 8459 } else 8460 Record->addDecl(NewFD); 8461 8462 return NewFD; 8463} 8464 8465/// \brief Build a new FieldDecl and check its well-formedness. 8466/// 8467/// This routine builds a new FieldDecl given the fields name, type, 8468/// record, etc. \p PrevDecl should refer to any previous declaration 8469/// with the same name and in the same scope as the field to be 8470/// created. 8471/// 8472/// \returns a new FieldDecl. 8473/// 8474/// \todo The Declarator argument is a hack. It will be removed once 8475FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8476 TypeSourceInfo *TInfo, 8477 RecordDecl *Record, SourceLocation Loc, 8478 bool Mutable, Expr *BitWidth, bool HasInit, 8479 SourceLocation TSSL, 8480 AccessSpecifier AS, NamedDecl *PrevDecl, 8481 Declarator *D) { 8482 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8483 bool InvalidDecl = false; 8484 if (D) InvalidDecl = D->isInvalidType(); 8485 8486 // If we receive a broken type, recover by assuming 'int' and 8487 // marking this declaration as invalid. 8488 if (T.isNull()) { 8489 InvalidDecl = true; 8490 T = Context.IntTy; 8491 } 8492 8493 QualType EltTy = Context.getBaseElementType(T); 8494 if (!EltTy->isDependentType() && 8495 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8496 // Fields of incomplete type force their record to be invalid. 8497 Record->setInvalidDecl(); 8498 InvalidDecl = true; 8499 } 8500 8501 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8502 // than a variably modified type. 8503 if (!InvalidDecl && T->isVariablyModifiedType()) { 8504 bool SizeIsNegative; 8505 llvm::APSInt Oversized; 8506 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8507 SizeIsNegative, 8508 Oversized); 8509 if (!FixedTy.isNull()) { 8510 Diag(Loc, diag::warn_illegal_constant_array_size); 8511 T = FixedTy; 8512 } else { 8513 if (SizeIsNegative) 8514 Diag(Loc, diag::err_typecheck_negative_array_size); 8515 else if (Oversized.getBoolValue()) 8516 Diag(Loc, diag::err_array_too_large) 8517 << Oversized.toString(10); 8518 else 8519 Diag(Loc, diag::err_typecheck_field_variable_size); 8520 InvalidDecl = true; 8521 } 8522 } 8523 8524 // Fields can not have abstract class types 8525 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8526 diag::err_abstract_type_in_decl, 8527 AbstractFieldType)) 8528 InvalidDecl = true; 8529 8530 bool ZeroWidth = false; 8531 // If this is declared as a bit-field, check the bit-field. 8532 if (!InvalidDecl && BitWidth && 8533 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8534 InvalidDecl = true; 8535 BitWidth = 0; 8536 ZeroWidth = false; 8537 } 8538 8539 // Check that 'mutable' is consistent with the type of the declaration. 8540 if (!InvalidDecl && Mutable) { 8541 unsigned DiagID = 0; 8542 if (T->isReferenceType()) 8543 DiagID = diag::err_mutable_reference; 8544 else if (T.isConstQualified()) 8545 DiagID = diag::err_mutable_const; 8546 8547 if (DiagID) { 8548 SourceLocation ErrLoc = Loc; 8549 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8550 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8551 Diag(ErrLoc, DiagID); 8552 Mutable = false; 8553 InvalidDecl = true; 8554 } 8555 } 8556 8557 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8558 BitWidth, Mutable, HasInit); 8559 if (InvalidDecl) 8560 NewFD->setInvalidDecl(); 8561 8562 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8563 Diag(Loc, diag::err_duplicate_member) << II; 8564 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8565 NewFD->setInvalidDecl(); 8566 } 8567 8568 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8569 if (Record->isUnion()) { 8570 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8571 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8572 if (RDecl->getDefinition()) { 8573 // C++ [class.union]p1: An object of a class with a non-trivial 8574 // constructor, a non-trivial copy constructor, a non-trivial 8575 // destructor, or a non-trivial copy assignment operator 8576 // cannot be a member of a union, nor can an array of such 8577 // objects. 8578 if (CheckNontrivialField(NewFD)) 8579 NewFD->setInvalidDecl(); 8580 } 8581 } 8582 8583 // C++ [class.union]p1: If a union contains a member of reference type, 8584 // the program is ill-formed. 8585 if (EltTy->isReferenceType()) { 8586 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8587 << NewFD->getDeclName() << EltTy; 8588 NewFD->setInvalidDecl(); 8589 } 8590 } 8591 } 8592 8593 // FIXME: We need to pass in the attributes given an AST 8594 // representation, not a parser representation. 8595 if (D) 8596 // FIXME: What to pass instead of TUScope? 8597 ProcessDeclAttributes(TUScope, NewFD, *D); 8598 8599 // In auto-retain/release, infer strong retension for fields of 8600 // retainable type. 8601 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8602 NewFD->setInvalidDecl(); 8603 8604 if (T.isObjCGCWeak()) 8605 Diag(Loc, diag::warn_attribute_weak_on_field); 8606 8607 NewFD->setAccess(AS); 8608 return NewFD; 8609} 8610 8611bool Sema::CheckNontrivialField(FieldDecl *FD) { 8612 assert(FD); 8613 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8614 8615 if (FD->isInvalidDecl()) 8616 return true; 8617 8618 QualType EltTy = Context.getBaseElementType(FD->getType()); 8619 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8620 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8621 if (RDecl->getDefinition()) { 8622 // We check for copy constructors before constructors 8623 // because otherwise we'll never get complaints about 8624 // copy constructors. 8625 8626 CXXSpecialMember member = CXXInvalid; 8627 if (!RDecl->hasTrivialCopyConstructor()) 8628 member = CXXCopyConstructor; 8629 else if (!RDecl->hasTrivialDefaultConstructor()) 8630 member = CXXDefaultConstructor; 8631 else if (!RDecl->hasTrivialCopyAssignment()) 8632 member = CXXCopyAssignment; 8633 else if (!RDecl->hasTrivialDestructor()) 8634 member = CXXDestructor; 8635 8636 if (member != CXXInvalid) { 8637 if (!getLangOptions().CPlusPlus0x && 8638 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8639 // Objective-C++ ARC: it is an error to have a non-trivial field of 8640 // a union. However, system headers in Objective-C programs 8641 // occasionally have Objective-C lifetime objects within unions, 8642 // and rather than cause the program to fail, we make those 8643 // members unavailable. 8644 SourceLocation Loc = FD->getLocation(); 8645 if (getSourceManager().isInSystemHeader(Loc)) { 8646 if (!FD->hasAttr<UnavailableAttr>()) 8647 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8648 "this system field has retaining ownership")); 8649 return false; 8650 } 8651 } 8652 8653 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8654 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8655 diag::err_illegal_union_or_anon_struct_member) 8656 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8657 DiagnoseNontrivial(RT, member); 8658 return !getLangOptions().CPlusPlus0x; 8659 } 8660 } 8661 } 8662 8663 return false; 8664} 8665 8666/// DiagnoseNontrivial - Given that a class has a non-trivial 8667/// special member, figure out why. 8668void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8669 QualType QT(T, 0U); 8670 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8671 8672 // Check whether the member was user-declared. 8673 switch (member) { 8674 case CXXInvalid: 8675 break; 8676 8677 case CXXDefaultConstructor: 8678 if (RD->hasUserDeclaredConstructor()) { 8679 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8680 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8681 const FunctionDecl *body = 0; 8682 ci->hasBody(body); 8683 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8684 SourceLocation CtorLoc = ci->getLocation(); 8685 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8686 return; 8687 } 8688 } 8689 8690 llvm_unreachable("found no user-declared constructors"); 8691 } 8692 break; 8693 8694 case CXXCopyConstructor: 8695 if (RD->hasUserDeclaredCopyConstructor()) { 8696 SourceLocation CtorLoc = 8697 RD->getCopyConstructor(0)->getLocation(); 8698 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8699 return; 8700 } 8701 break; 8702 8703 case CXXMoveConstructor: 8704 if (RD->hasUserDeclaredMoveConstructor()) { 8705 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8706 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8707 return; 8708 } 8709 break; 8710 8711 case CXXCopyAssignment: 8712 if (RD->hasUserDeclaredCopyAssignment()) { 8713 // FIXME: this should use the location of the copy 8714 // assignment, not the type. 8715 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8716 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8717 return; 8718 } 8719 break; 8720 8721 case CXXMoveAssignment: 8722 if (RD->hasUserDeclaredMoveAssignment()) { 8723 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8724 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8725 return; 8726 } 8727 break; 8728 8729 case CXXDestructor: 8730 if (RD->hasUserDeclaredDestructor()) { 8731 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8732 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8733 return; 8734 } 8735 break; 8736 } 8737 8738 typedef CXXRecordDecl::base_class_iterator base_iter; 8739 8740 // Virtual bases and members inhibit trivial copying/construction, 8741 // but not trivial destruction. 8742 if (member != CXXDestructor) { 8743 // Check for virtual bases. vbases includes indirect virtual bases, 8744 // so we just iterate through the direct bases. 8745 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8746 if (bi->isVirtual()) { 8747 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8748 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8749 return; 8750 } 8751 8752 // Check for virtual methods. 8753 typedef CXXRecordDecl::method_iterator meth_iter; 8754 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8755 ++mi) { 8756 if (mi->isVirtual()) { 8757 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8758 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8759 return; 8760 } 8761 } 8762 } 8763 8764 bool (CXXRecordDecl::*hasTrivial)() const; 8765 switch (member) { 8766 case CXXDefaultConstructor: 8767 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8768 case CXXCopyConstructor: 8769 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8770 case CXXCopyAssignment: 8771 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8772 case CXXDestructor: 8773 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8774 default: 8775 llvm_unreachable("unexpected special member"); 8776 } 8777 8778 // Check for nontrivial bases (and recurse). 8779 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8780 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8781 assert(BaseRT && "Don't know how to handle dependent bases"); 8782 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8783 if (!(BaseRecTy->*hasTrivial)()) { 8784 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8785 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8786 DiagnoseNontrivial(BaseRT, member); 8787 return; 8788 } 8789 } 8790 8791 // Check for nontrivial members (and recurse). 8792 typedef RecordDecl::field_iterator field_iter; 8793 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8794 ++fi) { 8795 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8796 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8797 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8798 8799 if (!(EltRD->*hasTrivial)()) { 8800 SourceLocation FLoc = (*fi)->getLocation(); 8801 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8802 DiagnoseNontrivial(EltRT, member); 8803 return; 8804 } 8805 } 8806 8807 if (EltTy->isObjCLifetimeType()) { 8808 switch (EltTy.getObjCLifetime()) { 8809 case Qualifiers::OCL_None: 8810 case Qualifiers::OCL_ExplicitNone: 8811 break; 8812 8813 case Qualifiers::OCL_Autoreleasing: 8814 case Qualifiers::OCL_Weak: 8815 case Qualifiers::OCL_Strong: 8816 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8817 << QT << EltTy.getObjCLifetime(); 8818 return; 8819 } 8820 } 8821 } 8822 8823 llvm_unreachable("found no explanation for non-trivial member"); 8824} 8825 8826/// TranslateIvarVisibility - Translate visibility from a token ID to an 8827/// AST enum value. 8828static ObjCIvarDecl::AccessControl 8829TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8830 switch (ivarVisibility) { 8831 default: llvm_unreachable("Unknown visitibility kind"); 8832 case tok::objc_private: return ObjCIvarDecl::Private; 8833 case tok::objc_public: return ObjCIvarDecl::Public; 8834 case tok::objc_protected: return ObjCIvarDecl::Protected; 8835 case tok::objc_package: return ObjCIvarDecl::Package; 8836 } 8837} 8838 8839/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8840/// in order to create an IvarDecl object for it. 8841Decl *Sema::ActOnIvar(Scope *S, 8842 SourceLocation DeclStart, 8843 Declarator &D, Expr *BitfieldWidth, 8844 tok::ObjCKeywordKind Visibility) { 8845 8846 IdentifierInfo *II = D.getIdentifier(); 8847 Expr *BitWidth = (Expr*)BitfieldWidth; 8848 SourceLocation Loc = DeclStart; 8849 if (II) Loc = D.getIdentifierLoc(); 8850 8851 // FIXME: Unnamed fields can be handled in various different ways, for 8852 // example, unnamed unions inject all members into the struct namespace! 8853 8854 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8855 QualType T = TInfo->getType(); 8856 8857 if (BitWidth) { 8858 // 6.7.2.1p3, 6.7.2.1p4 8859 if (VerifyBitField(Loc, II, T, BitWidth)) { 8860 D.setInvalidType(); 8861 BitWidth = 0; 8862 } 8863 } else { 8864 // Not a bitfield. 8865 8866 // validate II. 8867 8868 } 8869 if (T->isReferenceType()) { 8870 Diag(Loc, diag::err_ivar_reference_type); 8871 D.setInvalidType(); 8872 } 8873 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8874 // than a variably modified type. 8875 else if (T->isVariablyModifiedType()) { 8876 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8877 D.setInvalidType(); 8878 } 8879 8880 // Get the visibility (access control) for this ivar. 8881 ObjCIvarDecl::AccessControl ac = 8882 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8883 : ObjCIvarDecl::None; 8884 // Must set ivar's DeclContext to its enclosing interface. 8885 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8886 ObjCContainerDecl *EnclosingContext; 8887 if (ObjCImplementationDecl *IMPDecl = 8888 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8889 if (!LangOpts.ObjCNonFragileABI2) { 8890 // Case of ivar declared in an implementation. Context is that of its class. 8891 EnclosingContext = IMPDecl->getClassInterface(); 8892 assert(EnclosingContext && "Implementation has no class interface!"); 8893 } 8894 else 8895 EnclosingContext = EnclosingDecl; 8896 } else { 8897 if (ObjCCategoryDecl *CDecl = 8898 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8899 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8900 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8901 return 0; 8902 } 8903 } 8904 EnclosingContext = EnclosingDecl; 8905 } 8906 8907 // Construct the decl. 8908 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8909 DeclStart, Loc, II, T, 8910 TInfo, ac, (Expr *)BitfieldWidth); 8911 8912 if (II) { 8913 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8914 ForRedeclaration); 8915 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8916 && !isa<TagDecl>(PrevDecl)) { 8917 Diag(Loc, diag::err_duplicate_member) << II; 8918 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8919 NewID->setInvalidDecl(); 8920 } 8921 } 8922 8923 // Process attributes attached to the ivar. 8924 ProcessDeclAttributes(S, NewID, D); 8925 8926 if (D.isInvalidType()) 8927 NewID->setInvalidDecl(); 8928 8929 // In ARC, infer 'retaining' for ivars of retainable type. 8930 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8931 NewID->setInvalidDecl(); 8932 8933 if (D.getDeclSpec().isModulePrivateSpecified()) 8934 NewID->setModulePrivate(); 8935 8936 if (II) { 8937 // FIXME: When interfaces are DeclContexts, we'll need to add 8938 // these to the interface. 8939 S->AddDecl(NewID); 8940 IdResolver.AddDecl(NewID); 8941 } 8942 8943 return NewID; 8944} 8945 8946/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8947/// class and class extensions. For every class @interface and class 8948/// extension @interface, if the last ivar is a bitfield of any type, 8949/// then add an implicit `char :0` ivar to the end of that interface. 8950void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8951 SmallVectorImpl<Decl *> &AllIvarDecls) { 8952 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8953 return; 8954 8955 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8956 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8957 8958 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8959 return; 8960 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8961 if (!ID) { 8962 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8963 if (!CD->IsClassExtension()) 8964 return; 8965 } 8966 // No need to add this to end of @implementation. 8967 else 8968 return; 8969 } 8970 // All conditions are met. Add a new bitfield to the tail end of ivars. 8971 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8972 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8973 8974 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8975 DeclLoc, DeclLoc, 0, 8976 Context.CharTy, 8977 Context.getTrivialTypeSourceInfo(Context.CharTy, 8978 DeclLoc), 8979 ObjCIvarDecl::Private, BW, 8980 true); 8981 AllIvarDecls.push_back(Ivar); 8982} 8983 8984void Sema::ActOnFields(Scope* S, 8985 SourceLocation RecLoc, Decl *EnclosingDecl, 8986 llvm::ArrayRef<Decl *> Fields, 8987 SourceLocation LBrac, SourceLocation RBrac, 8988 AttributeList *Attr) { 8989 assert(EnclosingDecl && "missing record or interface decl"); 8990 8991 // If the decl this is being inserted into is invalid, then it may be a 8992 // redeclaration or some other bogus case. Don't try to add fields to it. 8993 if (EnclosingDecl->isInvalidDecl()) 8994 return; 8995 8996 // Verify that all the fields are okay. 8997 unsigned NumNamedMembers = 0; 8998 SmallVector<FieldDecl*, 32> RecFields; 8999 9000 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9001 bool ARCErrReported = false; 9002 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9003 i != end; ++i) { 9004 FieldDecl *FD = cast<FieldDecl>(*i); 9005 9006 // Get the type for the field. 9007 const Type *FDTy = FD->getType().getTypePtr(); 9008 9009 if (!FD->isAnonymousStructOrUnion()) { 9010 // Remember all fields written by the user. 9011 RecFields.push_back(FD); 9012 } 9013 9014 // If the field is already invalid for some reason, don't emit more 9015 // diagnostics about it. 9016 if (FD->isInvalidDecl()) { 9017 EnclosingDecl->setInvalidDecl(); 9018 continue; 9019 } 9020 9021 // C99 6.7.2.1p2: 9022 // A structure or union shall not contain a member with 9023 // incomplete or function type (hence, a structure shall not 9024 // contain an instance of itself, but may contain a pointer to 9025 // an instance of itself), except that the last member of a 9026 // structure with more than one named member may have incomplete 9027 // array type; such a structure (and any union containing, 9028 // possibly recursively, a member that is such a structure) 9029 // shall not be a member of a structure or an element of an 9030 // array. 9031 if (FDTy->isFunctionType()) { 9032 // Field declared as a function. 9033 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9034 << FD->getDeclName(); 9035 FD->setInvalidDecl(); 9036 EnclosingDecl->setInvalidDecl(); 9037 continue; 9038 } else if (FDTy->isIncompleteArrayType() && Record && 9039 ((i + 1 == Fields.end() && !Record->isUnion()) || 9040 ((getLangOptions().MicrosoftExt || 9041 getLangOptions().CPlusPlus) && 9042 (i + 1 == Fields.end() || Record->isUnion())))) { 9043 // Flexible array member. 9044 // Microsoft and g++ is more permissive regarding flexible array. 9045 // It will accept flexible array in union and also 9046 // as the sole element of a struct/class. 9047 if (getLangOptions().MicrosoftExt) { 9048 if (Record->isUnion()) 9049 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9050 << FD->getDeclName(); 9051 else if (Fields.size() == 1) 9052 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9053 << FD->getDeclName() << Record->getTagKind(); 9054 } else if (getLangOptions().CPlusPlus) { 9055 if (Record->isUnion()) 9056 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9057 << FD->getDeclName(); 9058 else if (Fields.size() == 1) 9059 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9060 << FD->getDeclName() << Record->getTagKind(); 9061 } else if (NumNamedMembers < 1) { 9062 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9063 << FD->getDeclName(); 9064 FD->setInvalidDecl(); 9065 EnclosingDecl->setInvalidDecl(); 9066 continue; 9067 } 9068 if (!FD->getType()->isDependentType() && 9069 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9070 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9071 << FD->getDeclName() << FD->getType(); 9072 FD->setInvalidDecl(); 9073 EnclosingDecl->setInvalidDecl(); 9074 continue; 9075 } 9076 // Okay, we have a legal flexible array member at the end of the struct. 9077 if (Record) 9078 Record->setHasFlexibleArrayMember(true); 9079 } else if (!FDTy->isDependentType() && 9080 RequireCompleteType(FD->getLocation(), FD->getType(), 9081 diag::err_field_incomplete)) { 9082 // Incomplete type 9083 FD->setInvalidDecl(); 9084 EnclosingDecl->setInvalidDecl(); 9085 continue; 9086 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9087 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9088 // If this is a member of a union, then entire union becomes "flexible". 9089 if (Record && Record->isUnion()) { 9090 Record->setHasFlexibleArrayMember(true); 9091 } else { 9092 // If this is a struct/class and this is not the last element, reject 9093 // it. Note that GCC supports variable sized arrays in the middle of 9094 // structures. 9095 if (i + 1 != Fields.end()) 9096 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9097 << FD->getDeclName() << FD->getType(); 9098 else { 9099 // We support flexible arrays at the end of structs in 9100 // other structs as an extension. 9101 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9102 << FD->getDeclName(); 9103 if (Record) 9104 Record->setHasFlexibleArrayMember(true); 9105 } 9106 } 9107 } 9108 if (Record && FDTTy->getDecl()->hasObjectMember()) 9109 Record->setHasObjectMember(true); 9110 } else if (FDTy->isObjCObjectType()) { 9111 /// A field cannot be an Objective-c object 9112 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9113 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9114 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9115 FD->setType(T); 9116 } 9117 else if (!getLangOptions().CPlusPlus) { 9118 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9119 // It's an error in ARC if a field has lifetime. 9120 // We don't want to report this in a system header, though, 9121 // so we just make the field unavailable. 9122 // FIXME: that's really not sufficient; we need to make the type 9123 // itself invalid to, say, initialize or copy. 9124 QualType T = FD->getType(); 9125 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9126 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9127 SourceLocation loc = FD->getLocation(); 9128 if (getSourceManager().isInSystemHeader(loc)) { 9129 if (!FD->hasAttr<UnavailableAttr>()) { 9130 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9131 "this system field has retaining ownership")); 9132 } 9133 } else { 9134 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9135 } 9136 ARCErrReported = true; 9137 } 9138 } 9139 else if (getLangOptions().ObjC1 && 9140 getLangOptions().getGC() != LangOptions::NonGC && 9141 Record && !Record->hasObjectMember()) { 9142 if (FD->getType()->isObjCObjectPointerType() || 9143 FD->getType().isObjCGCStrong()) 9144 Record->setHasObjectMember(true); 9145 else if (Context.getAsArrayType(FD->getType())) { 9146 QualType BaseType = Context.getBaseElementType(FD->getType()); 9147 if (BaseType->isRecordType() && 9148 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9149 Record->setHasObjectMember(true); 9150 else if (BaseType->isObjCObjectPointerType() || 9151 BaseType.isObjCGCStrong()) 9152 Record->setHasObjectMember(true); 9153 } 9154 } 9155 } 9156 // Keep track of the number of named members. 9157 if (FD->getIdentifier()) 9158 ++NumNamedMembers; 9159 } 9160 9161 // Okay, we successfully defined 'Record'. 9162 if (Record) { 9163 bool Completed = false; 9164 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9165 if (!CXXRecord->isInvalidDecl()) { 9166 // Set access bits correctly on the directly-declared conversions. 9167 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9168 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9169 I != E; ++I) 9170 Convs->setAccess(I, (*I)->getAccess()); 9171 9172 if (!CXXRecord->isDependentType()) { 9173 // Objective-C Automatic Reference Counting: 9174 // If a class has a non-static data member of Objective-C pointer 9175 // type (or array thereof), it is a non-POD type and its 9176 // default constructor (if any), copy constructor, copy assignment 9177 // operator, and destructor are non-trivial. 9178 // 9179 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9180 // However, here we check whether this particular class is only 9181 // non-POD because of the presence of an Objective-C pointer member. 9182 // If so, objects of this type cannot be shared between code compiled 9183 // with instant objects and code compiled with manual retain/release. 9184 if (getLangOptions().ObjCAutoRefCount && 9185 CXXRecord->hasObjectMember() && 9186 CXXRecord->getLinkage() == ExternalLinkage) { 9187 if (CXXRecord->isPOD()) { 9188 Diag(CXXRecord->getLocation(), 9189 diag::warn_arc_non_pod_class_with_object_member) 9190 << CXXRecord; 9191 } else { 9192 // FIXME: Fix-Its would be nice here, but finding a good location 9193 // for them is going to be tricky. 9194 if (CXXRecord->hasTrivialCopyConstructor()) 9195 Diag(CXXRecord->getLocation(), 9196 diag::warn_arc_trivial_member_function_with_object_member) 9197 << CXXRecord << 0; 9198 if (CXXRecord->hasTrivialCopyAssignment()) 9199 Diag(CXXRecord->getLocation(), 9200 diag::warn_arc_trivial_member_function_with_object_member) 9201 << CXXRecord << 1; 9202 if (CXXRecord->hasTrivialDestructor()) 9203 Diag(CXXRecord->getLocation(), 9204 diag::warn_arc_trivial_member_function_with_object_member) 9205 << CXXRecord << 2; 9206 } 9207 } 9208 9209 // Adjust user-defined destructor exception spec. 9210 if (getLangOptions().CPlusPlus0x && 9211 CXXRecord->hasUserDeclaredDestructor()) 9212 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9213 9214 // Add any implicitly-declared members to this class. 9215 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9216 9217 // If we have virtual base classes, we may end up finding multiple 9218 // final overriders for a given virtual function. Check for this 9219 // problem now. 9220 if (CXXRecord->getNumVBases()) { 9221 CXXFinalOverriderMap FinalOverriders; 9222 CXXRecord->getFinalOverriders(FinalOverriders); 9223 9224 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9225 MEnd = FinalOverriders.end(); 9226 M != MEnd; ++M) { 9227 for (OverridingMethods::iterator SO = M->second.begin(), 9228 SOEnd = M->second.end(); 9229 SO != SOEnd; ++SO) { 9230 assert(SO->second.size() > 0 && 9231 "Virtual function without overridding functions?"); 9232 if (SO->second.size() == 1) 9233 continue; 9234 9235 // C++ [class.virtual]p2: 9236 // In a derived class, if a virtual member function of a base 9237 // class subobject has more than one final overrider the 9238 // program is ill-formed. 9239 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9240 << (NamedDecl *)M->first << Record; 9241 Diag(M->first->getLocation(), 9242 diag::note_overridden_virtual_function); 9243 for (OverridingMethods::overriding_iterator 9244 OM = SO->second.begin(), 9245 OMEnd = SO->second.end(); 9246 OM != OMEnd; ++OM) 9247 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9248 << (NamedDecl *)M->first << OM->Method->getParent(); 9249 9250 Record->setInvalidDecl(); 9251 } 9252 } 9253 CXXRecord->completeDefinition(&FinalOverriders); 9254 Completed = true; 9255 } 9256 } 9257 } 9258 } 9259 9260 if (!Completed) 9261 Record->completeDefinition(); 9262 9263 // Now that the record is complete, do any delayed exception spec checks 9264 // we were missing. 9265 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9266 const CXXDestructorDecl *Dtor = 9267 DelayedDestructorExceptionSpecChecks.back().first; 9268 if (Dtor->getParent() != Record) 9269 break; 9270 9271 assert(!Dtor->getParent()->isDependentType() && 9272 "Should not ever add destructors of templates into the list."); 9273 CheckOverridingFunctionExceptionSpec(Dtor, 9274 DelayedDestructorExceptionSpecChecks.back().second); 9275 DelayedDestructorExceptionSpecChecks.pop_back(); 9276 } 9277 9278 } else { 9279 ObjCIvarDecl **ClsFields = 9280 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9281 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9282 ID->setLocEnd(RBrac); 9283 // Add ivar's to class's DeclContext. 9284 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9285 ClsFields[i]->setLexicalDeclContext(ID); 9286 ID->addDecl(ClsFields[i]); 9287 } 9288 // Must enforce the rule that ivars in the base classes may not be 9289 // duplicates. 9290 if (ID->getSuperClass()) 9291 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9292 } else if (ObjCImplementationDecl *IMPDecl = 9293 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9294 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9295 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9296 // Ivar declared in @implementation never belongs to the implementation. 9297 // Only it is in implementation's lexical context. 9298 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9299 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9300 } else if (ObjCCategoryDecl *CDecl = 9301 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9302 // case of ivars in class extension; all other cases have been 9303 // reported as errors elsewhere. 9304 // FIXME. Class extension does not have a LocEnd field. 9305 // CDecl->setLocEnd(RBrac); 9306 // Add ivar's to class extension's DeclContext. 9307 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9308 ClsFields[i]->setLexicalDeclContext(CDecl); 9309 CDecl->addDecl(ClsFields[i]); 9310 } 9311 } 9312 } 9313 9314 if (Attr) 9315 ProcessDeclAttributeList(S, Record, Attr); 9316 9317 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9318 // set the visibility of this record. 9319 if (Record && !Record->getDeclContext()->isRecord()) 9320 AddPushedVisibilityAttribute(Record); 9321} 9322 9323/// \brief Determine whether the given integral value is representable within 9324/// the given type T. 9325static bool isRepresentableIntegerValue(ASTContext &Context, 9326 llvm::APSInt &Value, 9327 QualType T) { 9328 assert(T->isIntegralType(Context) && "Integral type required!"); 9329 unsigned BitWidth = Context.getIntWidth(T); 9330 9331 if (Value.isUnsigned() || Value.isNonNegative()) { 9332 if (T->isSignedIntegerOrEnumerationType()) 9333 --BitWidth; 9334 return Value.getActiveBits() <= BitWidth; 9335 } 9336 return Value.getMinSignedBits() <= BitWidth; 9337} 9338 9339// \brief Given an integral type, return the next larger integral type 9340// (or a NULL type of no such type exists). 9341static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9342 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9343 // enum checking below. 9344 assert(T->isIntegralType(Context) && "Integral type required!"); 9345 const unsigned NumTypes = 4; 9346 QualType SignedIntegralTypes[NumTypes] = { 9347 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9348 }; 9349 QualType UnsignedIntegralTypes[NumTypes] = { 9350 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9351 Context.UnsignedLongLongTy 9352 }; 9353 9354 unsigned BitWidth = Context.getTypeSize(T); 9355 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9356 : UnsignedIntegralTypes; 9357 for (unsigned I = 0; I != NumTypes; ++I) 9358 if (Context.getTypeSize(Types[I]) > BitWidth) 9359 return Types[I]; 9360 9361 return QualType(); 9362} 9363 9364EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9365 EnumConstantDecl *LastEnumConst, 9366 SourceLocation IdLoc, 9367 IdentifierInfo *Id, 9368 Expr *Val) { 9369 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9370 llvm::APSInt EnumVal(IntWidth); 9371 QualType EltTy; 9372 9373 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9374 Val = 0; 9375 9376 if (Val) { 9377 if (Enum->isDependentType() || Val->isTypeDependent()) 9378 EltTy = Context.DependentTy; 9379 else { 9380 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9381 SourceLocation ExpLoc; 9382 if (!Val->isValueDependent() && 9383 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9384 Val = 0; 9385 } else { 9386 if (!getLangOptions().CPlusPlus) { 9387 // C99 6.7.2.2p2: 9388 // The expression that defines the value of an enumeration constant 9389 // shall be an integer constant expression that has a value 9390 // representable as an int. 9391 9392 // Complain if the value is not representable in an int. 9393 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9394 Diag(IdLoc, diag::ext_enum_value_not_int) 9395 << EnumVal.toString(10) << Val->getSourceRange() 9396 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9397 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9398 // Force the type of the expression to 'int'. 9399 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9400 } 9401 } 9402 9403 if (Enum->isFixed()) { 9404 EltTy = Enum->getIntegerType(); 9405 9406 // C++0x [dcl.enum]p5: 9407 // ... if the initializing value of an enumerator cannot be 9408 // represented by the underlying type, the program is ill-formed. 9409 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9410 if (getLangOptions().MicrosoftExt) { 9411 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9412 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9413 } else 9414 Diag(IdLoc, diag::err_enumerator_too_large) 9415 << EltTy; 9416 } else 9417 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9418 } 9419 else { 9420 // C++0x [dcl.enum]p5: 9421 // If the underlying type is not fixed, the type of each enumerator 9422 // is the type of its initializing value: 9423 // - If an initializer is specified for an enumerator, the 9424 // initializing value has the same type as the expression. 9425 EltTy = Val->getType(); 9426 } 9427 } 9428 } 9429 } 9430 9431 if (!Val) { 9432 if (Enum->isDependentType()) 9433 EltTy = Context.DependentTy; 9434 else if (!LastEnumConst) { 9435 // C++0x [dcl.enum]p5: 9436 // If the underlying type is not fixed, the type of each enumerator 9437 // is the type of its initializing value: 9438 // - If no initializer is specified for the first enumerator, the 9439 // initializing value has an unspecified integral type. 9440 // 9441 // GCC uses 'int' for its unspecified integral type, as does 9442 // C99 6.7.2.2p3. 9443 if (Enum->isFixed()) { 9444 EltTy = Enum->getIntegerType(); 9445 } 9446 else { 9447 EltTy = Context.IntTy; 9448 } 9449 } else { 9450 // Assign the last value + 1. 9451 EnumVal = LastEnumConst->getInitVal(); 9452 ++EnumVal; 9453 EltTy = LastEnumConst->getType(); 9454 9455 // Check for overflow on increment. 9456 if (EnumVal < LastEnumConst->getInitVal()) { 9457 // C++0x [dcl.enum]p5: 9458 // If the underlying type is not fixed, the type of each enumerator 9459 // is the type of its initializing value: 9460 // 9461 // - Otherwise the type of the initializing value is the same as 9462 // the type of the initializing value of the preceding enumerator 9463 // unless the incremented value is not representable in that type, 9464 // in which case the type is an unspecified integral type 9465 // sufficient to contain the incremented value. If no such type 9466 // exists, the program is ill-formed. 9467 QualType T = getNextLargerIntegralType(Context, EltTy); 9468 if (T.isNull() || Enum->isFixed()) { 9469 // There is no integral type larger enough to represent this 9470 // value. Complain, then allow the value to wrap around. 9471 EnumVal = LastEnumConst->getInitVal(); 9472 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9473 ++EnumVal; 9474 if (Enum->isFixed()) 9475 // When the underlying type is fixed, this is ill-formed. 9476 Diag(IdLoc, diag::err_enumerator_wrapped) 9477 << EnumVal.toString(10) 9478 << EltTy; 9479 else 9480 Diag(IdLoc, diag::warn_enumerator_too_large) 9481 << EnumVal.toString(10); 9482 } else { 9483 EltTy = T; 9484 } 9485 9486 // Retrieve the last enumerator's value, extent that type to the 9487 // type that is supposed to be large enough to represent the incremented 9488 // value, then increment. 9489 EnumVal = LastEnumConst->getInitVal(); 9490 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9491 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9492 ++EnumVal; 9493 9494 // If we're not in C++, diagnose the overflow of enumerator values, 9495 // which in C99 means that the enumerator value is not representable in 9496 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9497 // permits enumerator values that are representable in some larger 9498 // integral type. 9499 if (!getLangOptions().CPlusPlus && !T.isNull()) 9500 Diag(IdLoc, diag::warn_enum_value_overflow); 9501 } else if (!getLangOptions().CPlusPlus && 9502 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9503 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9504 Diag(IdLoc, diag::ext_enum_value_not_int) 9505 << EnumVal.toString(10) << 1; 9506 } 9507 } 9508 } 9509 9510 if (!EltTy->isDependentType()) { 9511 // Make the enumerator value match the signedness and size of the 9512 // enumerator's type. 9513 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9514 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9515 } 9516 9517 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9518 Val, EnumVal); 9519} 9520 9521 9522Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9523 SourceLocation IdLoc, IdentifierInfo *Id, 9524 AttributeList *Attr, 9525 SourceLocation EqualLoc, Expr *val) { 9526 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9527 EnumConstantDecl *LastEnumConst = 9528 cast_or_null<EnumConstantDecl>(lastEnumConst); 9529 Expr *Val = static_cast<Expr*>(val); 9530 9531 // The scope passed in may not be a decl scope. Zip up the scope tree until 9532 // we find one that is. 9533 S = getNonFieldDeclScope(S); 9534 9535 // Verify that there isn't already something declared with this name in this 9536 // scope. 9537 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9538 ForRedeclaration); 9539 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9540 // Maybe we will complain about the shadowed template parameter. 9541 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9542 // Just pretend that we didn't see the previous declaration. 9543 PrevDecl = 0; 9544 } 9545 9546 if (PrevDecl) { 9547 // When in C++, we may get a TagDecl with the same name; in this case the 9548 // enum constant will 'hide' the tag. 9549 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9550 "Received TagDecl when not in C++!"); 9551 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9552 if (isa<EnumConstantDecl>(PrevDecl)) 9553 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9554 else 9555 Diag(IdLoc, diag::err_redefinition) << Id; 9556 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9557 return 0; 9558 } 9559 } 9560 9561 // C++ [class.mem]p13: 9562 // If T is the name of a class, then each of the following shall have a 9563 // name different from T: 9564 // - every enumerator of every member of class T that is an enumerated 9565 // type 9566 if (CXXRecordDecl *Record 9567 = dyn_cast<CXXRecordDecl>( 9568 TheEnumDecl->getDeclContext()->getRedeclContext())) 9569 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9570 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9571 9572 EnumConstantDecl *New = 9573 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9574 9575 if (New) { 9576 // Process attributes. 9577 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9578 9579 // Register this decl in the current scope stack. 9580 New->setAccess(TheEnumDecl->getAccess()); 9581 PushOnScopeChains(New, S); 9582 } 9583 9584 return New; 9585} 9586 9587void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9588 SourceLocation RBraceLoc, Decl *EnumDeclX, 9589 Decl **Elements, unsigned NumElements, 9590 Scope *S, AttributeList *Attr) { 9591 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9592 QualType EnumType = Context.getTypeDeclType(Enum); 9593 9594 if (Attr) 9595 ProcessDeclAttributeList(S, Enum, Attr); 9596 9597 if (Enum->isDependentType()) { 9598 for (unsigned i = 0; i != NumElements; ++i) { 9599 EnumConstantDecl *ECD = 9600 cast_or_null<EnumConstantDecl>(Elements[i]); 9601 if (!ECD) continue; 9602 9603 ECD->setType(EnumType); 9604 } 9605 9606 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9607 return; 9608 } 9609 9610 // TODO: If the result value doesn't fit in an int, it must be a long or long 9611 // long value. ISO C does not support this, but GCC does as an extension, 9612 // emit a warning. 9613 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9614 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9615 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9616 9617 // Verify that all the values are okay, compute the size of the values, and 9618 // reverse the list. 9619 unsigned NumNegativeBits = 0; 9620 unsigned NumPositiveBits = 0; 9621 9622 // Keep track of whether all elements have type int. 9623 bool AllElementsInt = true; 9624 9625 for (unsigned i = 0; i != NumElements; ++i) { 9626 EnumConstantDecl *ECD = 9627 cast_or_null<EnumConstantDecl>(Elements[i]); 9628 if (!ECD) continue; // Already issued a diagnostic. 9629 9630 const llvm::APSInt &InitVal = ECD->getInitVal(); 9631 9632 // Keep track of the size of positive and negative values. 9633 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9634 NumPositiveBits = std::max(NumPositiveBits, 9635 (unsigned)InitVal.getActiveBits()); 9636 else 9637 NumNegativeBits = std::max(NumNegativeBits, 9638 (unsigned)InitVal.getMinSignedBits()); 9639 9640 // Keep track of whether every enum element has type int (very commmon). 9641 if (AllElementsInt) 9642 AllElementsInt = ECD->getType() == Context.IntTy; 9643 } 9644 9645 // Figure out the type that should be used for this enum. 9646 QualType BestType; 9647 unsigned BestWidth; 9648 9649 // C++0x N3000 [conv.prom]p3: 9650 // An rvalue of an unscoped enumeration type whose underlying 9651 // type is not fixed can be converted to an rvalue of the first 9652 // of the following types that can represent all the values of 9653 // the enumeration: int, unsigned int, long int, unsigned long 9654 // int, long long int, or unsigned long long int. 9655 // C99 6.4.4.3p2: 9656 // An identifier declared as an enumeration constant has type int. 9657 // The C99 rule is modified by a gcc extension 9658 QualType BestPromotionType; 9659 9660 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9661 // -fshort-enums is the equivalent to specifying the packed attribute on all 9662 // enum definitions. 9663 if (LangOpts.ShortEnums) 9664 Packed = true; 9665 9666 if (Enum->isFixed()) { 9667 BestType = BestPromotionType = Enum->getIntegerType(); 9668 // We don't need to set BestWidth, because BestType is going to be the type 9669 // of the enumerators, but we do anyway because otherwise some compilers 9670 // warn that it might be used uninitialized. 9671 BestWidth = CharWidth; 9672 } 9673 else if (NumNegativeBits) { 9674 // If there is a negative value, figure out the smallest integer type (of 9675 // int/long/longlong) that fits. 9676 // If it's packed, check also if it fits a char or a short. 9677 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9678 BestType = Context.SignedCharTy; 9679 BestWidth = CharWidth; 9680 } else if (Packed && NumNegativeBits <= ShortWidth && 9681 NumPositiveBits < ShortWidth) { 9682 BestType = Context.ShortTy; 9683 BestWidth = ShortWidth; 9684 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9685 BestType = Context.IntTy; 9686 BestWidth = IntWidth; 9687 } else { 9688 BestWidth = Context.getTargetInfo().getLongWidth(); 9689 9690 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9691 BestType = Context.LongTy; 9692 } else { 9693 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9694 9695 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9696 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9697 BestType = Context.LongLongTy; 9698 } 9699 } 9700 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9701 } else { 9702 // If there is no negative value, figure out the smallest type that fits 9703 // all of the enumerator values. 9704 // If it's packed, check also if it fits a char or a short. 9705 if (Packed && NumPositiveBits <= CharWidth) { 9706 BestType = Context.UnsignedCharTy; 9707 BestPromotionType = Context.IntTy; 9708 BestWidth = CharWidth; 9709 } else if (Packed && NumPositiveBits <= ShortWidth) { 9710 BestType = Context.UnsignedShortTy; 9711 BestPromotionType = Context.IntTy; 9712 BestWidth = ShortWidth; 9713 } else if (NumPositiveBits <= IntWidth) { 9714 BestType = Context.UnsignedIntTy; 9715 BestWidth = IntWidth; 9716 BestPromotionType 9717 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9718 ? Context.UnsignedIntTy : Context.IntTy; 9719 } else if (NumPositiveBits <= 9720 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9721 BestType = Context.UnsignedLongTy; 9722 BestPromotionType 9723 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9724 ? Context.UnsignedLongTy : Context.LongTy; 9725 } else { 9726 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9727 assert(NumPositiveBits <= BestWidth && 9728 "How could an initializer get larger than ULL?"); 9729 BestType = Context.UnsignedLongLongTy; 9730 BestPromotionType 9731 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9732 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9733 } 9734 } 9735 9736 // Loop over all of the enumerator constants, changing their types to match 9737 // the type of the enum if needed. 9738 for (unsigned i = 0; i != NumElements; ++i) { 9739 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9740 if (!ECD) continue; // Already issued a diagnostic. 9741 9742 // Standard C says the enumerators have int type, but we allow, as an 9743 // extension, the enumerators to be larger than int size. If each 9744 // enumerator value fits in an int, type it as an int, otherwise type it the 9745 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9746 // that X has type 'int', not 'unsigned'. 9747 9748 // Determine whether the value fits into an int. 9749 llvm::APSInt InitVal = ECD->getInitVal(); 9750 9751 // If it fits into an integer type, force it. Otherwise force it to match 9752 // the enum decl type. 9753 QualType NewTy; 9754 unsigned NewWidth; 9755 bool NewSign; 9756 if (!getLangOptions().CPlusPlus && 9757 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9758 NewTy = Context.IntTy; 9759 NewWidth = IntWidth; 9760 NewSign = true; 9761 } else if (ECD->getType() == BestType) { 9762 // Already the right type! 9763 if (getLangOptions().CPlusPlus) 9764 // C++ [dcl.enum]p4: Following the closing brace of an 9765 // enum-specifier, each enumerator has the type of its 9766 // enumeration. 9767 ECD->setType(EnumType); 9768 continue; 9769 } else { 9770 NewTy = BestType; 9771 NewWidth = BestWidth; 9772 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9773 } 9774 9775 // Adjust the APSInt value. 9776 InitVal = InitVal.extOrTrunc(NewWidth); 9777 InitVal.setIsSigned(NewSign); 9778 ECD->setInitVal(InitVal); 9779 9780 // Adjust the Expr initializer and type. 9781 if (ECD->getInitExpr() && 9782 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9783 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9784 CK_IntegralCast, 9785 ECD->getInitExpr(), 9786 /*base paths*/ 0, 9787 VK_RValue)); 9788 if (getLangOptions().CPlusPlus) 9789 // C++ [dcl.enum]p4: Following the closing brace of an 9790 // enum-specifier, each enumerator has the type of its 9791 // enumeration. 9792 ECD->setType(EnumType); 9793 else 9794 ECD->setType(NewTy); 9795 } 9796 9797 Enum->completeDefinition(BestType, BestPromotionType, 9798 NumPositiveBits, NumNegativeBits); 9799} 9800 9801Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9802 SourceLocation StartLoc, 9803 SourceLocation EndLoc) { 9804 StringLiteral *AsmString = cast<StringLiteral>(expr); 9805 9806 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9807 AsmString, StartLoc, 9808 EndLoc); 9809 CurContext->addDecl(New); 9810 return New; 9811} 9812 9813DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9814 IdentifierInfo &ModuleName, 9815 SourceLocation ModuleNameLoc) { 9816 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9817 ModuleName, ModuleNameLoc); 9818 if (!Module) 9819 return true; 9820 9821 // FIXME: Actually create a declaration to describe the module import. 9822 (void)Module; 9823 return DeclResult((Decl *)0); 9824} 9825 9826void 9827Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9828 SourceLocation ModulePrivateKeyword) { 9829 assert(!Old->isModulePrivate() && "Old is module-private!"); 9830 9831 Diag(New->getLocation(), diag::err_module_private_follows_public) 9832 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9833 Diag(Old->getLocation(), diag::note_previous_declaration) 9834 << Old->getDeclName(); 9835 9836 // Drop the __module_private__ from the new declaration, since it's invalid. 9837 New->setModulePrivate(false); 9838} 9839 9840void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9841 SourceLocation PragmaLoc, 9842 SourceLocation NameLoc) { 9843 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9844 9845 if (PrevDecl) { 9846 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9847 } else { 9848 (void)WeakUndeclaredIdentifiers.insert( 9849 std::pair<IdentifierInfo*,WeakInfo> 9850 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9851 } 9852} 9853 9854void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9855 IdentifierInfo* AliasName, 9856 SourceLocation PragmaLoc, 9857 SourceLocation NameLoc, 9858 SourceLocation AliasNameLoc) { 9859 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9860 LookupOrdinaryName); 9861 WeakInfo W = WeakInfo(Name, NameLoc); 9862 9863 if (PrevDecl) { 9864 if (!PrevDecl->hasAttr<AliasAttr>()) 9865 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9866 DeclApplyPragmaWeak(TUScope, ND, W); 9867 } else { 9868 (void)WeakUndeclaredIdentifiers.insert( 9869 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9870 } 9871} 9872 9873Decl *Sema::getObjCDeclContext() const { 9874 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9875} 9876 9877AvailabilityResult Sema::getCurContextAvailability() const { 9878 const Decl *D = cast<Decl>(getCurLexicalContext()); 9879 // A category implicitly has the availability of the interface. 9880 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9881 D = CatD->getClassInterface(); 9882 9883 return D->getAvailability(); 9884} 9885