SemaDecl.cpp revision cb1c9c36b856ad24bd32ec673fb2490d9770ab5f
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).get(); 421 } else { 422 assert(SS && SS->isInvalid() && 423 "Invalid scope specifier has already been diagnosed"); 424 } 425 426 return true; 427} 428 429/// \brief Determine whether the given result set contains either a type name 430/// or 431static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 433 NextToken.is(tok::less); 434 435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 437 return true; 438 439 if (CheckTemplate && isa<TemplateDecl>(*I)) 440 return true; 441 } 442 443 return false; 444} 445 446Sema::NameClassification Sema::ClassifyName(Scope *S, 447 CXXScopeSpec &SS, 448 IdentifierInfo *&Name, 449 SourceLocation NameLoc, 450 const Token &NextToken) { 451 DeclarationNameInfo NameInfo(Name, NameLoc); 452 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 453 454 if (NextToken.is(tok::coloncolon)) { 455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 456 QualType(), false, SS, 0, false); 457 458 } 459 460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 461 LookupParsedName(Result, S, &SS, !CurMethod); 462 463 // Perform lookup for Objective-C instance variables (including automatically 464 // synthesized instance variables), if we're in an Objective-C method. 465 // FIXME: This lookup really, really needs to be folded in to the normal 466 // unqualified lookup mechanism. 467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 468 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 469 if (E.get() || E.isInvalid()) 470 return E; 471 } 472 473 bool SecondTry = false; 474 bool IsFilteredTemplateName = false; 475 476Corrected: 477 switch (Result.getResultKind()) { 478 case LookupResult::NotFound: 479 // If an unqualified-id is followed by a '(', then we have a function 480 // call. 481 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 482 // In C++, this is an ADL-only call. 483 // FIXME: Reference? 484 if (getLangOptions().CPlusPlus) 485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 486 487 // C90 6.3.2.2: 488 // If the expression that precedes the parenthesized argument list in a 489 // function call consists solely of an identifier, and if no 490 // declaration is visible for this identifier, the identifier is 491 // implicitly declared exactly as if, in the innermost block containing 492 // the function call, the declaration 493 // 494 // extern int identifier (); 495 // 496 // appeared. 497 // 498 // We also allow this in C99 as an extension. 499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 500 Result.addDecl(D); 501 Result.resolveKind(); 502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 503 } 504 } 505 506 // In C, we first see whether there is a tag type by the same name, in 507 // which case it's likely that the user just forget to write "enum", 508 // "struct", or "union". 509 if (!getLangOptions().CPlusPlus && !SecondTry) { 510 Result.clear(LookupTagName); 511 LookupParsedName(Result, S, &SS); 512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 513 const char *TagName = 0; 514 const char *FixItTagName = 0; 515 switch (Tag->getTagKind()) { 516 case TTK_Class: 517 TagName = "class"; 518 FixItTagName = "class "; 519 break; 520 521 case TTK_Enum: 522 TagName = "enum"; 523 FixItTagName = "enum "; 524 break; 525 526 case TTK_Struct: 527 TagName = "struct"; 528 FixItTagName = "struct "; 529 break; 530 531 case TTK_Union: 532 TagName = "union"; 533 FixItTagName = "union "; 534 break; 535 } 536 537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 538 << Name << TagName << getLangOptions().CPlusPlus 539 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 540 break; 541 } 542 543 Result.clear(LookupOrdinaryName); 544 } 545 546 // Perform typo correction to determine if there is another name that is 547 // close to this name. 548 if (!SecondTry) { 549 SecondTry = true; 550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 551 Result.getLookupKind(), S, &SS)) { 552 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 553 unsigned QualifiedDiag = diag::err_no_member_suggest; 554 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 555 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 556 557 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 558 NamedDecl *UnderlyingFirstDecl 559 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 560 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 561 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 562 UnqualifiedDiag = diag::err_no_template_suggest; 563 QualifiedDiag = diag::err_no_member_template_suggest; 564 } else if (UnderlyingFirstDecl && 565 (isa<TypeDecl>(UnderlyingFirstDecl) || 566 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 567 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 568 UnqualifiedDiag = diag::err_unknown_typename_suggest; 569 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 570 } 571 572 if (SS.isEmpty()) 573 Diag(NameLoc, UnqualifiedDiag) 574 << Name << CorrectedQuotedStr 575 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 576 else 577 Diag(NameLoc, QualifiedDiag) 578 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 579 << SS.getRange() 580 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 581 582 // Update the name, so that the caller has the new name. 583 Name = Corrected.getCorrectionAsIdentifierInfo(); 584 585 // Also update the LookupResult... 586 // FIXME: This should probably go away at some point 587 Result.clear(); 588 Result.setLookupName(Corrected.getCorrection()); 589 if (FirstDecl) Result.addDecl(FirstDecl); 590 591 // Typo correction corrected to a keyword. 592 if (Corrected.isKeyword()) 593 return Corrected.getCorrectionAsIdentifierInfo(); 594 595 if (FirstDecl) 596 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 597 << CorrectedQuotedStr; 598 599 // If we found an Objective-C instance variable, let 600 // LookupInObjCMethod build the appropriate expression to 601 // reference the ivar. 602 // FIXME: This is a gross hack. 603 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 604 Result.clear(); 605 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 606 return move(E); 607 } 608 609 goto Corrected; 610 } 611 } 612 613 // We failed to correct; just fall through and let the parser deal with it. 614 Result.suppressDiagnostics(); 615 return NameClassification::Unknown(); 616 617 case LookupResult::NotFoundInCurrentInstantiation: 618 // We performed name lookup into the current instantiation, and there were 619 // dependent bases, so we treat this result the same way as any other 620 // dependent nested-name-specifier. 621 622 // C++ [temp.res]p2: 623 // A name used in a template declaration or definition and that is 624 // dependent on a template-parameter is assumed not to name a type 625 // unless the applicable name lookup finds a type name or the name is 626 // qualified by the keyword typename. 627 // 628 // FIXME: If the next token is '<', we might want to ask the parser to 629 // perform some heroics to see if we actually have a 630 // template-argument-list, which would indicate a missing 'template' 631 // keyword here. 632 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 633 634 case LookupResult::Found: 635 case LookupResult::FoundOverloaded: 636 case LookupResult::FoundUnresolvedValue: 637 break; 638 639 case LookupResult::Ambiguous: 640 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 641 hasAnyAcceptableTemplateNames(Result)) { 642 // C++ [temp.local]p3: 643 // A lookup that finds an injected-class-name (10.2) can result in an 644 // ambiguity in certain cases (for example, if it is found in more than 645 // one base class). If all of the injected-class-names that are found 646 // refer to specializations of the same class template, and if the name 647 // is followed by a template-argument-list, the reference refers to the 648 // class template itself and not a specialization thereof, and is not 649 // ambiguous. 650 // 651 // This filtering can make an ambiguous result into an unambiguous one, 652 // so try again after filtering out template names. 653 FilterAcceptableTemplateNames(Result); 654 if (!Result.isAmbiguous()) { 655 IsFilteredTemplateName = true; 656 break; 657 } 658 } 659 660 // Diagnose the ambiguity and return an error. 661 return NameClassification::Error(); 662 } 663 664 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 665 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 666 // C++ [temp.names]p3: 667 // After name lookup (3.4) finds that a name is a template-name or that 668 // an operator-function-id or a literal- operator-id refers to a set of 669 // overloaded functions any member of which is a function template if 670 // this is followed by a <, the < is always taken as the delimiter of a 671 // template-argument-list and never as the less-than operator. 672 if (!IsFilteredTemplateName) 673 FilterAcceptableTemplateNames(Result); 674 675 if (!Result.empty()) { 676 bool IsFunctionTemplate; 677 TemplateName Template; 678 if (Result.end() - Result.begin() > 1) { 679 IsFunctionTemplate = true; 680 Template = Context.getOverloadedTemplateName(Result.begin(), 681 Result.end()); 682 } else { 683 TemplateDecl *TD 684 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 685 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 686 687 if (SS.isSet() && !SS.isInvalid()) 688 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 689 /*TemplateKeyword=*/false, 690 TD); 691 else 692 Template = TemplateName(TD); 693 } 694 695 if (IsFunctionTemplate) { 696 // Function templates always go through overload resolution, at which 697 // point we'll perform the various checks (e.g., accessibility) we need 698 // to based on which function we selected. 699 Result.suppressDiagnostics(); 700 701 return NameClassification::FunctionTemplate(Template); 702 } 703 704 return NameClassification::TypeTemplate(Template); 705 } 706 } 707 708 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 709 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 710 DiagnoseUseOfDecl(Type, NameLoc); 711 QualType T = Context.getTypeDeclType(Type); 712 return ParsedType::make(T); 713 } 714 715 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 716 if (!Class) { 717 // FIXME: It's unfortunate that we don't have a Type node for handling this. 718 if (ObjCCompatibleAliasDecl *Alias 719 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 720 Class = Alias->getClassInterface(); 721 } 722 723 if (Class) { 724 DiagnoseUseOfDecl(Class, NameLoc); 725 726 if (NextToken.is(tok::period)) { 727 // Interface. <something> is parsed as a property reference expression. 728 // Just return "unknown" as a fall-through for now. 729 Result.suppressDiagnostics(); 730 return NameClassification::Unknown(); 731 } 732 733 QualType T = Context.getObjCInterfaceType(Class); 734 return ParsedType::make(T); 735 } 736 737 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 738 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 739 740 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 741 return BuildDeclarationNameExpr(SS, Result, ADL); 742} 743 744// Determines the context to return to after temporarily entering a 745// context. This depends in an unnecessarily complicated way on the 746// exact ordering of callbacks from the parser. 747DeclContext *Sema::getContainingDC(DeclContext *DC) { 748 749 // Functions defined inline within classes aren't parsed until we've 750 // finished parsing the top-level class, so the top-level class is 751 // the context we'll need to return to. 752 if (isa<FunctionDecl>(DC)) { 753 DC = DC->getLexicalParent(); 754 755 // A function not defined within a class will always return to its 756 // lexical context. 757 if (!isa<CXXRecordDecl>(DC)) 758 return DC; 759 760 // A C++ inline method/friend is parsed *after* the topmost class 761 // it was declared in is fully parsed ("complete"); the topmost 762 // class is the context we need to return to. 763 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 764 DC = RD; 765 766 // Return the declaration context of the topmost class the inline method is 767 // declared in. 768 return DC; 769 } 770 771 return DC->getLexicalParent(); 772} 773 774void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 775 assert(getContainingDC(DC) == CurContext && 776 "The next DeclContext should be lexically contained in the current one."); 777 CurContext = DC; 778 S->setEntity(DC); 779} 780 781void Sema::PopDeclContext() { 782 assert(CurContext && "DeclContext imbalance!"); 783 784 CurContext = getContainingDC(CurContext); 785 assert(CurContext && "Popped translation unit!"); 786} 787 788/// EnterDeclaratorContext - Used when we must lookup names in the context 789/// of a declarator's nested name specifier. 790/// 791void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 792 // C++0x [basic.lookup.unqual]p13: 793 // A name used in the definition of a static data member of class 794 // X (after the qualified-id of the static member) is looked up as 795 // if the name was used in a member function of X. 796 // C++0x [basic.lookup.unqual]p14: 797 // If a variable member of a namespace is defined outside of the 798 // scope of its namespace then any name used in the definition of 799 // the variable member (after the declarator-id) is looked up as 800 // if the definition of the variable member occurred in its 801 // namespace. 802 // Both of these imply that we should push a scope whose context 803 // is the semantic context of the declaration. We can't use 804 // PushDeclContext here because that context is not necessarily 805 // lexically contained in the current context. Fortunately, 806 // the containing scope should have the appropriate information. 807 808 assert(!S->getEntity() && "scope already has entity"); 809 810#ifndef NDEBUG 811 Scope *Ancestor = S->getParent(); 812 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 813 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 814#endif 815 816 CurContext = DC; 817 S->setEntity(DC); 818} 819 820void Sema::ExitDeclaratorContext(Scope *S) { 821 assert(S->getEntity() == CurContext && "Context imbalance!"); 822 823 // Switch back to the lexical context. The safety of this is 824 // enforced by an assert in EnterDeclaratorContext. 825 Scope *Ancestor = S->getParent(); 826 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 827 CurContext = (DeclContext*) Ancestor->getEntity(); 828 829 // We don't need to do anything with the scope, which is going to 830 // disappear. 831} 832 833 834void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 835 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 836 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 837 // We assume that the caller has already called 838 // ActOnReenterTemplateScope 839 FD = TFD->getTemplatedDecl(); 840 } 841 if (!FD) 842 return; 843 844 PushDeclContext(S, FD); 845 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 846 ParmVarDecl *Param = FD->getParamDecl(P); 847 // If the parameter has an identifier, then add it to the scope 848 if (Param->getIdentifier()) { 849 S->AddDecl(Param); 850 IdResolver.AddDecl(Param); 851 } 852 } 853} 854 855 856/// \brief Determine whether we allow overloading of the function 857/// PrevDecl with another declaration. 858/// 859/// This routine determines whether overloading is possible, not 860/// whether some new function is actually an overload. It will return 861/// true in C++ (where we can always provide overloads) or, as an 862/// extension, in C when the previous function is already an 863/// overloaded function declaration or has the "overloadable" 864/// attribute. 865static bool AllowOverloadingOfFunction(LookupResult &Previous, 866 ASTContext &Context) { 867 if (Context.getLangOptions().CPlusPlus) 868 return true; 869 870 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 871 return true; 872 873 return (Previous.getResultKind() == LookupResult::Found 874 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 875} 876 877/// Add this decl to the scope shadowed decl chains. 878void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 879 // Move up the scope chain until we find the nearest enclosing 880 // non-transparent context. The declaration will be introduced into this 881 // scope. 882 while (S->getEntity() && 883 ((DeclContext *)S->getEntity())->isTransparentContext()) 884 S = S->getParent(); 885 886 // Add scoped declarations into their context, so that they can be 887 // found later. Declarations without a context won't be inserted 888 // into any context. 889 if (AddToContext) 890 CurContext->addDecl(D); 891 892 // Out-of-line definitions shouldn't be pushed into scope in C++. 893 // Out-of-line variable and function definitions shouldn't even in C. 894 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 895 D->isOutOfLine() && 896 !D->getDeclContext()->getRedeclContext()->Equals( 897 D->getLexicalDeclContext()->getRedeclContext())) 898 return; 899 900 // Template instantiations should also not be pushed into scope. 901 if (isa<FunctionDecl>(D) && 902 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 903 return; 904 905 // If this replaces anything in the current scope, 906 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 907 IEnd = IdResolver.end(); 908 for (; I != IEnd; ++I) { 909 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 910 S->RemoveDecl(*I); 911 IdResolver.RemoveDecl(*I); 912 913 // Should only need to replace one decl. 914 break; 915 } 916 } 917 918 S->AddDecl(D); 919 920 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 921 // Implicitly-generated labels may end up getting generated in an order that 922 // isn't strictly lexical, which breaks name lookup. Be careful to insert 923 // the label at the appropriate place in the identifier chain. 924 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 925 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 926 if (IDC == CurContext) { 927 if (!S->isDeclScope(*I)) 928 continue; 929 } else if (IDC->Encloses(CurContext)) 930 break; 931 } 932 933 IdResolver.InsertDeclAfter(I, D); 934 } else { 935 IdResolver.AddDecl(D); 936 } 937} 938 939bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 940 bool ExplicitInstantiationOrSpecialization) { 941 return IdResolver.isDeclInScope(D, Ctx, Context, S, 942 ExplicitInstantiationOrSpecialization); 943} 944 945Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 946 DeclContext *TargetDC = DC->getPrimaryContext(); 947 do { 948 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 949 if (ScopeDC->getPrimaryContext() == TargetDC) 950 return S; 951 } while ((S = S->getParent())); 952 953 return 0; 954} 955 956static bool isOutOfScopePreviousDeclaration(NamedDecl *, 957 DeclContext*, 958 ASTContext&); 959 960/// Filters out lookup results that don't fall within the given scope 961/// as determined by isDeclInScope. 962void Sema::FilterLookupForScope(LookupResult &R, 963 DeclContext *Ctx, Scope *S, 964 bool ConsiderLinkage, 965 bool ExplicitInstantiationOrSpecialization) { 966 LookupResult::Filter F = R.makeFilter(); 967 while (F.hasNext()) { 968 NamedDecl *D = F.next(); 969 970 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 971 continue; 972 973 if (ConsiderLinkage && 974 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 975 continue; 976 977 F.erase(); 978 } 979 980 F.done(); 981} 982 983static bool isUsingDecl(NamedDecl *D) { 984 return isa<UsingShadowDecl>(D) || 985 isa<UnresolvedUsingTypenameDecl>(D) || 986 isa<UnresolvedUsingValueDecl>(D); 987} 988 989/// Removes using shadow declarations from the lookup results. 990static void RemoveUsingDecls(LookupResult &R) { 991 LookupResult::Filter F = R.makeFilter(); 992 while (F.hasNext()) 993 if (isUsingDecl(F.next())) 994 F.erase(); 995 996 F.done(); 997} 998 999/// \brief Check for this common pattern: 1000/// @code 1001/// class S { 1002/// S(const S&); // DO NOT IMPLEMENT 1003/// void operator=(const S&); // DO NOT IMPLEMENT 1004/// }; 1005/// @endcode 1006static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1007 // FIXME: Should check for private access too but access is set after we get 1008 // the decl here. 1009 if (D->doesThisDeclarationHaveABody()) 1010 return false; 1011 1012 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1013 return CD->isCopyConstructor(); 1014 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1015 return Method->isCopyAssignmentOperator(); 1016 return false; 1017} 1018 1019bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1020 assert(D); 1021 1022 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1023 return false; 1024 1025 // Ignore class templates. 1026 if (D->getDeclContext()->isDependentContext() || 1027 D->getLexicalDeclContext()->isDependentContext()) 1028 return false; 1029 1030 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1031 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1032 return false; 1033 1034 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1035 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1036 return false; 1037 } else { 1038 // 'static inline' functions are used in headers; don't warn. 1039 if (FD->getStorageClass() == SC_Static && 1040 FD->isInlineSpecified()) 1041 return false; 1042 } 1043 1044 if (FD->doesThisDeclarationHaveABody() && 1045 Context.DeclMustBeEmitted(FD)) 1046 return false; 1047 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1048 if (!VD->isFileVarDecl() || 1049 VD->getType().isConstant(Context) || 1050 Context.DeclMustBeEmitted(VD)) 1051 return false; 1052 1053 if (VD->isStaticDataMember() && 1054 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1055 return false; 1056 1057 } else { 1058 return false; 1059 } 1060 1061 // Only warn for unused decls internal to the translation unit. 1062 if (D->getLinkage() == ExternalLinkage) 1063 return false; 1064 1065 return true; 1066} 1067 1068void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1069 if (!D) 1070 return; 1071 1072 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1073 const FunctionDecl *First = FD->getFirstDeclaration(); 1074 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1075 return; // First should already be in the vector. 1076 } 1077 1078 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1079 const VarDecl *First = VD->getFirstDeclaration(); 1080 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1085 UnusedFileScopedDecls.push_back(D); 1086 } 1087 1088static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1089 if (D->isInvalidDecl()) 1090 return false; 1091 1092 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1093 return false; 1094 1095 if (isa<LabelDecl>(D)) 1096 return true; 1097 1098 // White-list anything that isn't a local variable. 1099 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1100 !D->getDeclContext()->isFunctionOrMethod()) 1101 return false; 1102 1103 // Types of valid local variables should be complete, so this should succeed. 1104 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1105 1106 // White-list anything with an __attribute__((unused)) type. 1107 QualType Ty = VD->getType(); 1108 1109 // Only look at the outermost level of typedef. 1110 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1111 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1112 return false; 1113 } 1114 1115 // If we failed to complete the type for some reason, or if the type is 1116 // dependent, don't diagnose the variable. 1117 if (Ty->isIncompleteType() || Ty->isDependentType()) 1118 return false; 1119 1120 if (const TagType *TT = Ty->getAs<TagType>()) { 1121 const TagDecl *Tag = TT->getDecl(); 1122 if (Tag->hasAttr<UnusedAttr>()) 1123 return false; 1124 1125 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1126 // FIXME: Checking for the presence of a user-declared constructor 1127 // isn't completely accurate; we'd prefer to check that the initializer 1128 // has no side effects. 1129 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1130 return false; 1131 } 1132 } 1133 1134 // TODO: __attribute__((unused)) templates? 1135 } 1136 1137 return true; 1138} 1139 1140static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1141 FixItHint &Hint) { 1142 if (isa<LabelDecl>(D)) { 1143 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1144 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1145 if (AfterColon.isInvalid()) 1146 return; 1147 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1148 getCharRange(D->getLocStart(), AfterColon)); 1149 } 1150 return; 1151} 1152 1153/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1154/// unless they are marked attr(unused). 1155void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1156 FixItHint Hint; 1157 if (!ShouldDiagnoseUnusedDecl(D)) 1158 return; 1159 1160 GenerateFixForUnusedDecl(D, Context, Hint); 1161 1162 unsigned DiagID; 1163 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1164 DiagID = diag::warn_unused_exception_param; 1165 else if (isa<LabelDecl>(D)) 1166 DiagID = diag::warn_unused_label; 1167 else 1168 DiagID = diag::warn_unused_variable; 1169 1170 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1171} 1172 1173static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1174 // Verify that we have no forward references left. If so, there was a goto 1175 // or address of a label taken, but no definition of it. Label fwd 1176 // definitions are indicated with a null substmt. 1177 if (L->getStmt() == 0) 1178 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1179} 1180 1181void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1182 if (S->decl_empty()) return; 1183 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1184 "Scope shouldn't contain decls!"); 1185 1186 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1187 I != E; ++I) { 1188 Decl *TmpD = (*I); 1189 assert(TmpD && "This decl didn't get pushed??"); 1190 1191 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1192 NamedDecl *D = cast<NamedDecl>(TmpD); 1193 1194 if (!D->getDeclName()) continue; 1195 1196 // Diagnose unused variables in this scope. 1197 if (!S->hasErrorOccurred()) 1198 DiagnoseUnusedDecl(D); 1199 1200 // If this was a forward reference to a label, verify it was defined. 1201 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1202 CheckPoppedLabel(LD, *this); 1203 1204 // Remove this name from our lexical scope. 1205 IdResolver.RemoveDecl(D); 1206 } 1207} 1208 1209/// \brief Look for an Objective-C class in the translation unit. 1210/// 1211/// \param Id The name of the Objective-C class we're looking for. If 1212/// typo-correction fixes this name, the Id will be updated 1213/// to the fixed name. 1214/// 1215/// \param IdLoc The location of the name in the translation unit. 1216/// 1217/// \param TypoCorrection If true, this routine will attempt typo correction 1218/// if there is no class with the given name. 1219/// 1220/// \returns The declaration of the named Objective-C class, or NULL if the 1221/// class could not be found. 1222ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1223 SourceLocation IdLoc, 1224 bool DoTypoCorrection) { 1225 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1226 // creation from this context. 1227 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1228 1229 if (!IDecl && DoTypoCorrection) { 1230 // Perform typo correction at the given location, but only if we 1231 // find an Objective-C class name. 1232 TypoCorrection C; 1233 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1234 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1235 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1236 Diag(IdLoc, diag::err_undef_interface_suggest) 1237 << Id << IDecl->getDeclName() 1238 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1239 Diag(IDecl->getLocation(), diag::note_previous_decl) 1240 << IDecl->getDeclName(); 1241 1242 Id = IDecl->getIdentifier(); 1243 } 1244 } 1245 1246 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1247} 1248 1249/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1250/// from S, where a non-field would be declared. This routine copes 1251/// with the difference between C and C++ scoping rules in structs and 1252/// unions. For example, the following code is well-formed in C but 1253/// ill-formed in C++: 1254/// @code 1255/// struct S6 { 1256/// enum { BAR } e; 1257/// }; 1258/// 1259/// void test_S6() { 1260/// struct S6 a; 1261/// a.e = BAR; 1262/// } 1263/// @endcode 1264/// For the declaration of BAR, this routine will return a different 1265/// scope. The scope S will be the scope of the unnamed enumeration 1266/// within S6. In C++, this routine will return the scope associated 1267/// with S6, because the enumeration's scope is a transparent 1268/// context but structures can contain non-field names. In C, this 1269/// routine will return the translation unit scope, since the 1270/// enumeration's scope is a transparent context and structures cannot 1271/// contain non-field names. 1272Scope *Sema::getNonFieldDeclScope(Scope *S) { 1273 while (((S->getFlags() & Scope::DeclScope) == 0) || 1274 (S->getEntity() && 1275 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1276 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1277 S = S->getParent(); 1278 return S; 1279} 1280 1281/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1282/// file scope. lazily create a decl for it. ForRedeclaration is true 1283/// if we're creating this built-in in anticipation of redeclaring the 1284/// built-in. 1285NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1286 Scope *S, bool ForRedeclaration, 1287 SourceLocation Loc) { 1288 Builtin::ID BID = (Builtin::ID)bid; 1289 1290 ASTContext::GetBuiltinTypeError Error; 1291 QualType R = Context.GetBuiltinType(BID, Error); 1292 switch (Error) { 1293 case ASTContext::GE_None: 1294 // Okay 1295 break; 1296 1297 case ASTContext::GE_Missing_stdio: 1298 if (ForRedeclaration) 1299 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1300 << Context.BuiltinInfo.GetName(BID); 1301 return 0; 1302 1303 case ASTContext::GE_Missing_setjmp: 1304 if (ForRedeclaration) 1305 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1306 << Context.BuiltinInfo.GetName(BID); 1307 return 0; 1308 } 1309 1310 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1311 Diag(Loc, diag::ext_implicit_lib_function_decl) 1312 << Context.BuiltinInfo.GetName(BID) 1313 << R; 1314 if (Context.BuiltinInfo.getHeaderName(BID) && 1315 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1316 != DiagnosticsEngine::Ignored) 1317 Diag(Loc, diag::note_please_include_header) 1318 << Context.BuiltinInfo.getHeaderName(BID) 1319 << Context.BuiltinInfo.GetName(BID); 1320 } 1321 1322 FunctionDecl *New = FunctionDecl::Create(Context, 1323 Context.getTranslationUnitDecl(), 1324 Loc, Loc, II, R, /*TInfo=*/0, 1325 SC_Extern, 1326 SC_None, false, 1327 /*hasPrototype=*/true); 1328 New->setImplicit(); 1329 1330 // Create Decl objects for each parameter, adding them to the 1331 // FunctionDecl. 1332 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1333 SmallVector<ParmVarDecl*, 16> Params; 1334 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1335 ParmVarDecl *parm = 1336 ParmVarDecl::Create(Context, New, SourceLocation(), 1337 SourceLocation(), 0, 1338 FT->getArgType(i), /*TInfo=*/0, 1339 SC_None, SC_None, 0); 1340 parm->setScopeInfo(0, i); 1341 Params.push_back(parm); 1342 } 1343 New->setParams(Params); 1344 } 1345 1346 AddKnownFunctionAttributes(New); 1347 1348 // TUScope is the translation-unit scope to insert this function into. 1349 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1350 // relate Scopes to DeclContexts, and probably eliminate CurContext 1351 // entirely, but we're not there yet. 1352 DeclContext *SavedContext = CurContext; 1353 CurContext = Context.getTranslationUnitDecl(); 1354 PushOnScopeChains(New, TUScope); 1355 CurContext = SavedContext; 1356 return New; 1357} 1358 1359/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1360/// same name and scope as a previous declaration 'Old'. Figure out 1361/// how to resolve this situation, merging decls or emitting 1362/// diagnostics as appropriate. If there was an error, set New to be invalid. 1363/// 1364void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1365 // If the new decl is known invalid already, don't bother doing any 1366 // merging checks. 1367 if (New->isInvalidDecl()) return; 1368 1369 // Allow multiple definitions for ObjC built-in typedefs. 1370 // FIXME: Verify the underlying types are equivalent! 1371 if (getLangOptions().ObjC1) { 1372 const IdentifierInfo *TypeID = New->getIdentifier(); 1373 switch (TypeID->getLength()) { 1374 default: break; 1375 case 2: 1376 if (!TypeID->isStr("id")) 1377 break; 1378 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1379 // Install the built-in type for 'id', ignoring the current definition. 1380 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1381 return; 1382 case 5: 1383 if (!TypeID->isStr("Class")) 1384 break; 1385 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1386 // Install the built-in type for 'Class', ignoring the current definition. 1387 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1388 return; 1389 case 3: 1390 if (!TypeID->isStr("SEL")) 1391 break; 1392 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1393 // Install the built-in type for 'SEL', ignoring the current definition. 1394 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1395 return; 1396 } 1397 // Fall through - the typedef name was not a builtin type. 1398 } 1399 1400 // Verify the old decl was also a type. 1401 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1402 if (!Old) { 1403 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1404 << New->getDeclName(); 1405 1406 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1407 if (OldD->getLocation().isValid()) 1408 Diag(OldD->getLocation(), diag::note_previous_definition); 1409 1410 return New->setInvalidDecl(); 1411 } 1412 1413 // If the old declaration is invalid, just give up here. 1414 if (Old->isInvalidDecl()) 1415 return New->setInvalidDecl(); 1416 1417 // Determine the "old" type we'll use for checking and diagnostics. 1418 QualType OldType; 1419 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1420 OldType = OldTypedef->getUnderlyingType(); 1421 else 1422 OldType = Context.getTypeDeclType(Old); 1423 1424 // If the typedef types are not identical, reject them in all languages and 1425 // with any extensions enabled. 1426 1427 if (OldType != New->getUnderlyingType() && 1428 Context.getCanonicalType(OldType) != 1429 Context.getCanonicalType(New->getUnderlyingType())) { 1430 int Kind = 0; 1431 if (isa<TypeAliasDecl>(Old)) 1432 Kind = 1; 1433 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1434 << Kind << New->getUnderlyingType() << OldType; 1435 if (Old->getLocation().isValid()) 1436 Diag(Old->getLocation(), diag::note_previous_definition); 1437 return New->setInvalidDecl(); 1438 } 1439 1440 // The types match. Link up the redeclaration chain if the old 1441 // declaration was a typedef. 1442 // FIXME: this is a potential source of weirdness if the type 1443 // spellings don't match exactly. 1444 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1445 New->setPreviousDeclaration(Typedef); 1446 1447 // __module_private__ is propagated to later declarations. 1448 if (Old->isModulePrivate()) 1449 New->setModulePrivate(); 1450 else if (New->isModulePrivate()) 1451 diagnoseModulePrivateRedeclaration(New, Old); 1452 1453 if (getLangOptions().MicrosoftExt) 1454 return; 1455 1456 if (getLangOptions().CPlusPlus) { 1457 // C++ [dcl.typedef]p2: 1458 // In a given non-class scope, a typedef specifier can be used to 1459 // redefine the name of any type declared in that scope to refer 1460 // to the type to which it already refers. 1461 if (!isa<CXXRecordDecl>(CurContext)) 1462 return; 1463 1464 // C++0x [dcl.typedef]p4: 1465 // In a given class scope, a typedef specifier can be used to redefine 1466 // any class-name declared in that scope that is not also a typedef-name 1467 // to refer to the type to which it already refers. 1468 // 1469 // This wording came in via DR424, which was a correction to the 1470 // wording in DR56, which accidentally banned code like: 1471 // 1472 // struct S { 1473 // typedef struct A { } A; 1474 // }; 1475 // 1476 // in the C++03 standard. We implement the C++0x semantics, which 1477 // allow the above but disallow 1478 // 1479 // struct S { 1480 // typedef int I; 1481 // typedef int I; 1482 // }; 1483 // 1484 // since that was the intent of DR56. 1485 if (!isa<TypedefNameDecl>(Old)) 1486 return; 1487 1488 Diag(New->getLocation(), diag::err_redefinition) 1489 << New->getDeclName(); 1490 Diag(Old->getLocation(), diag::note_previous_definition); 1491 return New->setInvalidDecl(); 1492 } 1493 1494 // If we have a redefinition of a typedef in C, emit a warning. This warning 1495 // is normally mapped to an error, but can be controlled with 1496 // -Wtypedef-redefinition. If either the original or the redefinition is 1497 // in a system header, don't emit this for compatibility with GCC. 1498 if (getDiagnostics().getSuppressSystemWarnings() && 1499 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1500 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1501 return; 1502 1503 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1504 << New->getDeclName(); 1505 Diag(Old->getLocation(), diag::note_previous_definition); 1506 return; 1507} 1508 1509/// DeclhasAttr - returns true if decl Declaration already has the target 1510/// attribute. 1511static bool 1512DeclHasAttr(const Decl *D, const Attr *A) { 1513 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1514 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1515 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1516 if ((*i)->getKind() == A->getKind()) { 1517 if (Ann) { 1518 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1519 return true; 1520 continue; 1521 } 1522 // FIXME: Don't hardcode this check 1523 if (OA && isa<OwnershipAttr>(*i)) 1524 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1525 return true; 1526 } 1527 1528 return false; 1529} 1530 1531/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1532static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1533 ASTContext &C, bool mergeDeprecation = true) { 1534 if (!oldDecl->hasAttrs()) 1535 return; 1536 1537 bool foundAny = newDecl->hasAttrs(); 1538 1539 // Ensure that any moving of objects within the allocated map is done before 1540 // we process them. 1541 if (!foundAny) newDecl->setAttrs(AttrVec()); 1542 1543 for (specific_attr_iterator<InheritableAttr> 1544 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1545 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1546 // Ignore deprecated/unavailable/availability attributes if requested. 1547 if (!mergeDeprecation && 1548 (isa<DeprecatedAttr>(*i) || 1549 isa<UnavailableAttr>(*i) || 1550 isa<AvailabilityAttr>(*i))) 1551 continue; 1552 1553 if (!DeclHasAttr(newDecl, *i)) { 1554 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1555 newAttr->setInherited(true); 1556 newDecl->addAttr(newAttr); 1557 foundAny = true; 1558 } 1559 } 1560 1561 if (!foundAny) newDecl->dropAttrs(); 1562} 1563 1564/// mergeParamDeclAttributes - Copy attributes from the old parameter 1565/// to the new one. 1566static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1567 const ParmVarDecl *oldDecl, 1568 ASTContext &C) { 1569 if (!oldDecl->hasAttrs()) 1570 return; 1571 1572 bool foundAny = newDecl->hasAttrs(); 1573 1574 // Ensure that any moving of objects within the allocated map is 1575 // done before we process them. 1576 if (!foundAny) newDecl->setAttrs(AttrVec()); 1577 1578 for (specific_attr_iterator<InheritableParamAttr> 1579 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1580 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1581 if (!DeclHasAttr(newDecl, *i)) { 1582 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1583 newAttr->setInherited(true); 1584 newDecl->addAttr(newAttr); 1585 foundAny = true; 1586 } 1587 } 1588 1589 if (!foundAny) newDecl->dropAttrs(); 1590} 1591 1592namespace { 1593 1594/// Used in MergeFunctionDecl to keep track of function parameters in 1595/// C. 1596struct GNUCompatibleParamWarning { 1597 ParmVarDecl *OldParm; 1598 ParmVarDecl *NewParm; 1599 QualType PromotedType; 1600}; 1601 1602} 1603 1604/// getSpecialMember - get the special member enum for a method. 1605Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1606 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1607 if (Ctor->isDefaultConstructor()) 1608 return Sema::CXXDefaultConstructor; 1609 1610 if (Ctor->isCopyConstructor()) 1611 return Sema::CXXCopyConstructor; 1612 1613 if (Ctor->isMoveConstructor()) 1614 return Sema::CXXMoveConstructor; 1615 } else if (isa<CXXDestructorDecl>(MD)) { 1616 return Sema::CXXDestructor; 1617 } else if (MD->isCopyAssignmentOperator()) { 1618 return Sema::CXXCopyAssignment; 1619 } else if (MD->isMoveAssignmentOperator()) { 1620 return Sema::CXXMoveAssignment; 1621 } 1622 1623 return Sema::CXXInvalid; 1624} 1625 1626/// canRedefineFunction - checks if a function can be redefined. Currently, 1627/// only extern inline functions can be redefined, and even then only in 1628/// GNU89 mode. 1629static bool canRedefineFunction(const FunctionDecl *FD, 1630 const LangOptions& LangOpts) { 1631 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1632 !LangOpts.CPlusPlus && 1633 FD->isInlineSpecified() && 1634 FD->getStorageClass() == SC_Extern); 1635} 1636 1637/// MergeFunctionDecl - We just parsed a function 'New' from 1638/// declarator D which has the same name and scope as a previous 1639/// declaration 'Old'. Figure out how to resolve this situation, 1640/// merging decls or emitting diagnostics as appropriate. 1641/// 1642/// In C++, New and Old must be declarations that are not 1643/// overloaded. Use IsOverload to determine whether New and Old are 1644/// overloaded, and to select the Old declaration that New should be 1645/// merged with. 1646/// 1647/// Returns true if there was an error, false otherwise. 1648bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1649 // Verify the old decl was also a function. 1650 FunctionDecl *Old = 0; 1651 if (FunctionTemplateDecl *OldFunctionTemplate 1652 = dyn_cast<FunctionTemplateDecl>(OldD)) 1653 Old = OldFunctionTemplate->getTemplatedDecl(); 1654 else 1655 Old = dyn_cast<FunctionDecl>(OldD); 1656 if (!Old) { 1657 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1658 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1659 Diag(Shadow->getTargetDecl()->getLocation(), 1660 diag::note_using_decl_target); 1661 Diag(Shadow->getUsingDecl()->getLocation(), 1662 diag::note_using_decl) << 0; 1663 return true; 1664 } 1665 1666 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1667 << New->getDeclName(); 1668 Diag(OldD->getLocation(), diag::note_previous_definition); 1669 return true; 1670 } 1671 1672 // Determine whether the previous declaration was a definition, 1673 // implicit declaration, or a declaration. 1674 diag::kind PrevDiag; 1675 if (Old->isThisDeclarationADefinition()) 1676 PrevDiag = diag::note_previous_definition; 1677 else if (Old->isImplicit()) 1678 PrevDiag = diag::note_previous_implicit_declaration; 1679 else 1680 PrevDiag = diag::note_previous_declaration; 1681 1682 QualType OldQType = Context.getCanonicalType(Old->getType()); 1683 QualType NewQType = Context.getCanonicalType(New->getType()); 1684 1685 // Don't complain about this if we're in GNU89 mode and the old function 1686 // is an extern inline function. 1687 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1688 New->getStorageClass() == SC_Static && 1689 Old->getStorageClass() != SC_Static && 1690 !canRedefineFunction(Old, getLangOptions())) { 1691 if (getLangOptions().MicrosoftExt) { 1692 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1693 Diag(Old->getLocation(), PrevDiag); 1694 } else { 1695 Diag(New->getLocation(), diag::err_static_non_static) << New; 1696 Diag(Old->getLocation(), PrevDiag); 1697 return true; 1698 } 1699 } 1700 1701 // If a function is first declared with a calling convention, but is 1702 // later declared or defined without one, the second decl assumes the 1703 // calling convention of the first. 1704 // 1705 // For the new decl, we have to look at the NON-canonical type to tell the 1706 // difference between a function that really doesn't have a calling 1707 // convention and one that is declared cdecl. That's because in 1708 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1709 // because it is the default calling convention. 1710 // 1711 // Note also that we DO NOT return at this point, because we still have 1712 // other tests to run. 1713 const FunctionType *OldType = cast<FunctionType>(OldQType); 1714 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1715 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1716 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1717 bool RequiresAdjustment = false; 1718 if (OldTypeInfo.getCC() != CC_Default && 1719 NewTypeInfo.getCC() == CC_Default) { 1720 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1721 RequiresAdjustment = true; 1722 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1723 NewTypeInfo.getCC())) { 1724 // Calling conventions really aren't compatible, so complain. 1725 Diag(New->getLocation(), diag::err_cconv_change) 1726 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1727 << (OldTypeInfo.getCC() == CC_Default) 1728 << (OldTypeInfo.getCC() == CC_Default ? "" : 1729 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1730 Diag(Old->getLocation(), diag::note_previous_declaration); 1731 return true; 1732 } 1733 1734 // FIXME: diagnose the other way around? 1735 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1736 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1737 RequiresAdjustment = true; 1738 } 1739 1740 // Merge regparm attribute. 1741 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1742 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1743 if (NewTypeInfo.getHasRegParm()) { 1744 Diag(New->getLocation(), diag::err_regparm_mismatch) 1745 << NewType->getRegParmType() 1746 << OldType->getRegParmType(); 1747 Diag(Old->getLocation(), diag::note_previous_declaration); 1748 return true; 1749 } 1750 1751 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1752 RequiresAdjustment = true; 1753 } 1754 1755 // Merge ns_returns_retained attribute. 1756 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1757 if (NewTypeInfo.getProducesResult()) { 1758 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1759 Diag(Old->getLocation(), diag::note_previous_declaration); 1760 return true; 1761 } 1762 1763 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1764 RequiresAdjustment = true; 1765 } 1766 1767 if (RequiresAdjustment) { 1768 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1769 New->setType(QualType(NewType, 0)); 1770 NewQType = Context.getCanonicalType(New->getType()); 1771 } 1772 1773 if (getLangOptions().CPlusPlus) { 1774 // (C++98 13.1p2): 1775 // Certain function declarations cannot be overloaded: 1776 // -- Function declarations that differ only in the return type 1777 // cannot be overloaded. 1778 QualType OldReturnType = OldType->getResultType(); 1779 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1780 QualType ResQT; 1781 if (OldReturnType != NewReturnType) { 1782 if (NewReturnType->isObjCObjectPointerType() 1783 && OldReturnType->isObjCObjectPointerType()) 1784 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1785 if (ResQT.isNull()) { 1786 if (New->isCXXClassMember() && New->isOutOfLine()) 1787 Diag(New->getLocation(), 1788 diag::err_member_def_does_not_match_ret_type) << New; 1789 else 1790 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1791 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1792 return true; 1793 } 1794 else 1795 NewQType = ResQT; 1796 } 1797 1798 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1799 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1800 if (OldMethod && NewMethod) { 1801 // Preserve triviality. 1802 NewMethod->setTrivial(OldMethod->isTrivial()); 1803 1804 // MSVC allows explicit template specialization at class scope: 1805 // 2 CXMethodDecls referring to the same function will be injected. 1806 // We don't want a redeclartion error. 1807 bool IsClassScopeExplicitSpecialization = 1808 OldMethod->isFunctionTemplateSpecialization() && 1809 NewMethod->isFunctionTemplateSpecialization(); 1810 bool isFriend = NewMethod->getFriendObjectKind(); 1811 1812 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1813 !IsClassScopeExplicitSpecialization) { 1814 // -- Member function declarations with the same name and the 1815 // same parameter types cannot be overloaded if any of them 1816 // is a static member function declaration. 1817 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1818 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1819 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1820 return true; 1821 } 1822 1823 // C++ [class.mem]p1: 1824 // [...] A member shall not be declared twice in the 1825 // member-specification, except that a nested class or member 1826 // class template can be declared and then later defined. 1827 unsigned NewDiag; 1828 if (isa<CXXConstructorDecl>(OldMethod)) 1829 NewDiag = diag::err_constructor_redeclared; 1830 else if (isa<CXXDestructorDecl>(NewMethod)) 1831 NewDiag = diag::err_destructor_redeclared; 1832 else if (isa<CXXConversionDecl>(NewMethod)) 1833 NewDiag = diag::err_conv_function_redeclared; 1834 else 1835 NewDiag = diag::err_member_redeclared; 1836 1837 Diag(New->getLocation(), NewDiag); 1838 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1839 1840 // Complain if this is an explicit declaration of a special 1841 // member that was initially declared implicitly. 1842 // 1843 // As an exception, it's okay to befriend such methods in order 1844 // to permit the implicit constructor/destructor/operator calls. 1845 } else if (OldMethod->isImplicit()) { 1846 if (isFriend) { 1847 NewMethod->setImplicit(); 1848 } else { 1849 Diag(NewMethod->getLocation(), 1850 diag::err_definition_of_implicitly_declared_member) 1851 << New << getSpecialMember(OldMethod); 1852 return true; 1853 } 1854 } else if (OldMethod->isExplicitlyDefaulted()) { 1855 Diag(NewMethod->getLocation(), 1856 diag::err_definition_of_explicitly_defaulted_member) 1857 << getSpecialMember(OldMethod); 1858 return true; 1859 } 1860 } 1861 1862 // (C++98 8.3.5p3): 1863 // All declarations for a function shall agree exactly in both the 1864 // return type and the parameter-type-list. 1865 // We also want to respect all the extended bits except noreturn. 1866 1867 // noreturn should now match unless the old type info didn't have it. 1868 QualType OldQTypeForComparison = OldQType; 1869 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1870 assert(OldQType == QualType(OldType, 0)); 1871 const FunctionType *OldTypeForComparison 1872 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1873 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1874 assert(OldQTypeForComparison.isCanonical()); 1875 } 1876 1877 if (OldQTypeForComparison == NewQType) 1878 return MergeCompatibleFunctionDecls(New, Old); 1879 1880 // Fall through for conflicting redeclarations and redefinitions. 1881 } 1882 1883 // C: Function types need to be compatible, not identical. This handles 1884 // duplicate function decls like "void f(int); void f(enum X);" properly. 1885 if (!getLangOptions().CPlusPlus && 1886 Context.typesAreCompatible(OldQType, NewQType)) { 1887 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1888 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1889 const FunctionProtoType *OldProto = 0; 1890 if (isa<FunctionNoProtoType>(NewFuncType) && 1891 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1892 // The old declaration provided a function prototype, but the 1893 // new declaration does not. Merge in the prototype. 1894 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1895 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1896 OldProto->arg_type_end()); 1897 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1898 ParamTypes.data(), ParamTypes.size(), 1899 OldProto->getExtProtoInfo()); 1900 New->setType(NewQType); 1901 New->setHasInheritedPrototype(); 1902 1903 // Synthesize a parameter for each argument type. 1904 SmallVector<ParmVarDecl*, 16> Params; 1905 for (FunctionProtoType::arg_type_iterator 1906 ParamType = OldProto->arg_type_begin(), 1907 ParamEnd = OldProto->arg_type_end(); 1908 ParamType != ParamEnd; ++ParamType) { 1909 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1910 SourceLocation(), 1911 SourceLocation(), 0, 1912 *ParamType, /*TInfo=*/0, 1913 SC_None, SC_None, 1914 0); 1915 Param->setScopeInfo(0, Params.size()); 1916 Param->setImplicit(); 1917 Params.push_back(Param); 1918 } 1919 1920 New->setParams(Params); 1921 } 1922 1923 return MergeCompatibleFunctionDecls(New, Old); 1924 } 1925 1926 // GNU C permits a K&R definition to follow a prototype declaration 1927 // if the declared types of the parameters in the K&R definition 1928 // match the types in the prototype declaration, even when the 1929 // promoted types of the parameters from the K&R definition differ 1930 // from the types in the prototype. GCC then keeps the types from 1931 // the prototype. 1932 // 1933 // If a variadic prototype is followed by a non-variadic K&R definition, 1934 // the K&R definition becomes variadic. This is sort of an edge case, but 1935 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1936 // C99 6.9.1p8. 1937 if (!getLangOptions().CPlusPlus && 1938 Old->hasPrototype() && !New->hasPrototype() && 1939 New->getType()->getAs<FunctionProtoType>() && 1940 Old->getNumParams() == New->getNumParams()) { 1941 SmallVector<QualType, 16> ArgTypes; 1942 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1943 const FunctionProtoType *OldProto 1944 = Old->getType()->getAs<FunctionProtoType>(); 1945 const FunctionProtoType *NewProto 1946 = New->getType()->getAs<FunctionProtoType>(); 1947 1948 // Determine whether this is the GNU C extension. 1949 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1950 NewProto->getResultType()); 1951 bool LooseCompatible = !MergedReturn.isNull(); 1952 for (unsigned Idx = 0, End = Old->getNumParams(); 1953 LooseCompatible && Idx != End; ++Idx) { 1954 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1955 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1956 if (Context.typesAreCompatible(OldParm->getType(), 1957 NewProto->getArgType(Idx))) { 1958 ArgTypes.push_back(NewParm->getType()); 1959 } else if (Context.typesAreCompatible(OldParm->getType(), 1960 NewParm->getType(), 1961 /*CompareUnqualified=*/true)) { 1962 GNUCompatibleParamWarning Warn 1963 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1964 Warnings.push_back(Warn); 1965 ArgTypes.push_back(NewParm->getType()); 1966 } else 1967 LooseCompatible = false; 1968 } 1969 1970 if (LooseCompatible) { 1971 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1972 Diag(Warnings[Warn].NewParm->getLocation(), 1973 diag::ext_param_promoted_not_compatible_with_prototype) 1974 << Warnings[Warn].PromotedType 1975 << Warnings[Warn].OldParm->getType(); 1976 if (Warnings[Warn].OldParm->getLocation().isValid()) 1977 Diag(Warnings[Warn].OldParm->getLocation(), 1978 diag::note_previous_declaration); 1979 } 1980 1981 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1982 ArgTypes.size(), 1983 OldProto->getExtProtoInfo())); 1984 return MergeCompatibleFunctionDecls(New, Old); 1985 } 1986 1987 // Fall through to diagnose conflicting types. 1988 } 1989 1990 // A function that has already been declared has been redeclared or defined 1991 // with a different type- show appropriate diagnostic 1992 if (unsigned BuiltinID = Old->getBuiltinID()) { 1993 // The user has declared a builtin function with an incompatible 1994 // signature. 1995 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1996 // The function the user is redeclaring is a library-defined 1997 // function like 'malloc' or 'printf'. Warn about the 1998 // redeclaration, then pretend that we don't know about this 1999 // library built-in. 2000 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2001 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2002 << Old << Old->getType(); 2003 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2004 Old->setInvalidDecl(); 2005 return false; 2006 } 2007 2008 PrevDiag = diag::note_previous_builtin_declaration; 2009 } 2010 2011 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2012 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2013 return true; 2014} 2015 2016/// \brief Completes the merge of two function declarations that are 2017/// known to be compatible. 2018/// 2019/// This routine handles the merging of attributes and other 2020/// properties of function declarations form the old declaration to 2021/// the new declaration, once we know that New is in fact a 2022/// redeclaration of Old. 2023/// 2024/// \returns false 2025bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2026 // Merge the attributes 2027 mergeDeclAttributes(New, Old, Context); 2028 2029 // Merge the storage class. 2030 if (Old->getStorageClass() != SC_Extern && 2031 Old->getStorageClass() != SC_None) 2032 New->setStorageClass(Old->getStorageClass()); 2033 2034 // Merge "pure" flag. 2035 if (Old->isPure()) 2036 New->setPure(); 2037 2038 // __module_private__ is propagated to later declarations. 2039 if (Old->isModulePrivate()) 2040 New->setModulePrivate(); 2041 else if (New->isModulePrivate()) 2042 diagnoseModulePrivateRedeclaration(New, Old); 2043 2044 // Merge attributes from the parameters. These can mismatch with K&R 2045 // declarations. 2046 if (New->getNumParams() == Old->getNumParams()) 2047 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2048 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2049 Context); 2050 2051 if (getLangOptions().CPlusPlus) 2052 return MergeCXXFunctionDecl(New, Old); 2053 2054 return false; 2055} 2056 2057 2058void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2059 const ObjCMethodDecl *oldMethod) { 2060 // We don't want to merge unavailable and deprecated attributes 2061 // except from interface to implementation. 2062 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2063 2064 // Merge the attributes. 2065 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2066 2067 // Merge attributes from the parameters. 2068 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2069 for (ObjCMethodDecl::param_iterator 2070 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2071 ni != ne; ++ni, ++oi) 2072 mergeParamDeclAttributes(*ni, *oi, Context); 2073 2074 CheckObjCMethodOverride(newMethod, oldMethod, true); 2075} 2076 2077/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2078/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2079/// emitting diagnostics as appropriate. 2080/// 2081/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2082/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2083/// check them before the initializer is attached. 2084/// 2085void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2086 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2087 return; 2088 2089 QualType MergedT; 2090 if (getLangOptions().CPlusPlus) { 2091 AutoType *AT = New->getType()->getContainedAutoType(); 2092 if (AT && !AT->isDeduced()) { 2093 // We don't know what the new type is until the initializer is attached. 2094 return; 2095 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2096 // These could still be something that needs exception specs checked. 2097 return MergeVarDeclExceptionSpecs(New, Old); 2098 } 2099 // C++ [basic.link]p10: 2100 // [...] the types specified by all declarations referring to a given 2101 // object or function shall be identical, except that declarations for an 2102 // array object can specify array types that differ by the presence or 2103 // absence of a major array bound (8.3.4). 2104 else if (Old->getType()->isIncompleteArrayType() && 2105 New->getType()->isArrayType()) { 2106 CanQual<ArrayType> OldArray 2107 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2108 CanQual<ArrayType> NewArray 2109 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2110 if (OldArray->getElementType() == NewArray->getElementType()) 2111 MergedT = New->getType(); 2112 } else if (Old->getType()->isArrayType() && 2113 New->getType()->isIncompleteArrayType()) { 2114 CanQual<ArrayType> OldArray 2115 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2116 CanQual<ArrayType> NewArray 2117 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2118 if (OldArray->getElementType() == NewArray->getElementType()) 2119 MergedT = Old->getType(); 2120 } else if (New->getType()->isObjCObjectPointerType() 2121 && Old->getType()->isObjCObjectPointerType()) { 2122 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2123 Old->getType()); 2124 } 2125 } else { 2126 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2127 } 2128 if (MergedT.isNull()) { 2129 Diag(New->getLocation(), diag::err_redefinition_different_type) 2130 << New->getDeclName(); 2131 Diag(Old->getLocation(), diag::note_previous_definition); 2132 return New->setInvalidDecl(); 2133 } 2134 New->setType(MergedT); 2135} 2136 2137/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2138/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2139/// situation, merging decls or emitting diagnostics as appropriate. 2140/// 2141/// Tentative definition rules (C99 6.9.2p2) are checked by 2142/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2143/// definitions here, since the initializer hasn't been attached. 2144/// 2145void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2146 // If the new decl is already invalid, don't do any other checking. 2147 if (New->isInvalidDecl()) 2148 return; 2149 2150 // Verify the old decl was also a variable. 2151 VarDecl *Old = 0; 2152 if (!Previous.isSingleResult() || 2153 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2154 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2155 << New->getDeclName(); 2156 Diag(Previous.getRepresentativeDecl()->getLocation(), 2157 diag::note_previous_definition); 2158 return New->setInvalidDecl(); 2159 } 2160 2161 // C++ [class.mem]p1: 2162 // A member shall not be declared twice in the member-specification [...] 2163 // 2164 // Here, we need only consider static data members. 2165 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2166 Diag(New->getLocation(), diag::err_duplicate_member) 2167 << New->getIdentifier(); 2168 Diag(Old->getLocation(), diag::note_previous_declaration); 2169 New->setInvalidDecl(); 2170 } 2171 2172 mergeDeclAttributes(New, Old, Context); 2173 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2174 if (New->getAttr<WeakImportAttr>() && 2175 Old->getStorageClass() == SC_None && 2176 !Old->getAttr<WeakImportAttr>()) { 2177 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2178 Diag(Old->getLocation(), diag::note_previous_definition); 2179 // Remove weak_import attribute on new declaration. 2180 New->dropAttr<WeakImportAttr>(); 2181 } 2182 2183 // Merge the types. 2184 MergeVarDeclTypes(New, Old); 2185 if (New->isInvalidDecl()) 2186 return; 2187 2188 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2189 if (New->getStorageClass() == SC_Static && 2190 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2191 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 return New->setInvalidDecl(); 2194 } 2195 // C99 6.2.2p4: 2196 // For an identifier declared with the storage-class specifier 2197 // extern in a scope in which a prior declaration of that 2198 // identifier is visible,23) if the prior declaration specifies 2199 // internal or external linkage, the linkage of the identifier at 2200 // the later declaration is the same as the linkage specified at 2201 // the prior declaration. If no prior declaration is visible, or 2202 // if the prior declaration specifies no linkage, then the 2203 // identifier has external linkage. 2204 if (New->hasExternalStorage() && Old->hasLinkage()) 2205 /* Okay */; 2206 else if (New->getStorageClass() != SC_Static && 2207 Old->getStorageClass() == SC_Static) { 2208 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2209 Diag(Old->getLocation(), diag::note_previous_definition); 2210 return New->setInvalidDecl(); 2211 } 2212 2213 // Check if extern is followed by non-extern and vice-versa. 2214 if (New->hasExternalStorage() && 2215 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2216 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2217 Diag(Old->getLocation(), diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 if (Old->hasExternalStorage() && 2221 !New->hasLinkage() && New->isLocalVarDecl()) { 2222 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2223 Diag(Old->getLocation(), diag::note_previous_definition); 2224 return New->setInvalidDecl(); 2225 } 2226 2227 // __module_private__ is propagated to later declarations. 2228 if (Old->isModulePrivate()) 2229 New->setModulePrivate(); 2230 else if (New->isModulePrivate()) 2231 diagnoseModulePrivateRedeclaration(New, Old); 2232 2233 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2234 2235 // FIXME: The test for external storage here seems wrong? We still 2236 // need to check for mismatches. 2237 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2238 // Don't complain about out-of-line definitions of static members. 2239 !(Old->getLexicalDeclContext()->isRecord() && 2240 !New->getLexicalDeclContext()->isRecord())) { 2241 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2242 Diag(Old->getLocation(), diag::note_previous_definition); 2243 return New->setInvalidDecl(); 2244 } 2245 2246 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2247 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2248 Diag(Old->getLocation(), diag::note_previous_definition); 2249 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2250 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2251 Diag(Old->getLocation(), diag::note_previous_definition); 2252 } 2253 2254 // C++ doesn't have tentative definitions, so go right ahead and check here. 2255 const VarDecl *Def; 2256 if (getLangOptions().CPlusPlus && 2257 New->isThisDeclarationADefinition() == VarDecl::Definition && 2258 (Def = Old->getDefinition())) { 2259 Diag(New->getLocation(), diag::err_redefinition) 2260 << New->getDeclName(); 2261 Diag(Def->getLocation(), diag::note_previous_definition); 2262 New->setInvalidDecl(); 2263 return; 2264 } 2265 // c99 6.2.2 P4. 2266 // For an identifier declared with the storage-class specifier extern in a 2267 // scope in which a prior declaration of that identifier is visible, if 2268 // the prior declaration specifies internal or external linkage, the linkage 2269 // of the identifier at the later declaration is the same as the linkage 2270 // specified at the prior declaration. 2271 // FIXME. revisit this code. 2272 if (New->hasExternalStorage() && 2273 Old->getLinkage() == InternalLinkage && 2274 New->getDeclContext() == Old->getDeclContext()) 2275 New->setStorageClass(Old->getStorageClass()); 2276 2277 // Keep a chain of previous declarations. 2278 New->setPreviousDeclaration(Old); 2279 2280 // Inherit access appropriately. 2281 New->setAccess(Old->getAccess()); 2282} 2283 2284/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2285/// no declarator (e.g. "struct foo;") is parsed. 2286Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2287 DeclSpec &DS) { 2288 return ParsedFreeStandingDeclSpec(S, AS, DS, 2289 MultiTemplateParamsArg(*this, 0, 0)); 2290} 2291 2292/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2293/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2294/// parameters to cope with template friend declarations. 2295Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2296 DeclSpec &DS, 2297 MultiTemplateParamsArg TemplateParams) { 2298 Decl *TagD = 0; 2299 TagDecl *Tag = 0; 2300 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2301 DS.getTypeSpecType() == DeclSpec::TST_struct || 2302 DS.getTypeSpecType() == DeclSpec::TST_union || 2303 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2304 TagD = DS.getRepAsDecl(); 2305 2306 if (!TagD) // We probably had an error 2307 return 0; 2308 2309 // Note that the above type specs guarantee that the 2310 // type rep is a Decl, whereas in many of the others 2311 // it's a Type. 2312 Tag = dyn_cast<TagDecl>(TagD); 2313 } 2314 2315 if (Tag) 2316 Tag->setFreeStanding(); 2317 2318 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2319 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2320 // or incomplete types shall not be restrict-qualified." 2321 if (TypeQuals & DeclSpec::TQ_restrict) 2322 Diag(DS.getRestrictSpecLoc(), 2323 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2324 << DS.getSourceRange(); 2325 } 2326 2327 if (DS.isConstexprSpecified()) { 2328 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2329 // and definitions of functions and variables. 2330 if (Tag) 2331 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2332 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2333 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2334 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2335 else 2336 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2337 // Don't emit warnings after this error. 2338 return TagD; 2339 } 2340 2341 if (DS.isFriendSpecified()) { 2342 // If we're dealing with a decl but not a TagDecl, assume that 2343 // whatever routines created it handled the friendship aspect. 2344 if (TagD && !Tag) 2345 return 0; 2346 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2347 } 2348 2349 // Track whether we warned about the fact that there aren't any 2350 // declarators. 2351 bool emittedWarning = false; 2352 2353 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2354 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2355 2356 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2357 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2358 if (getLangOptions().CPlusPlus || 2359 Record->getDeclContext()->isRecord()) 2360 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2361 2362 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2363 << DS.getSourceRange(); 2364 emittedWarning = true; 2365 } 2366 } 2367 2368 // Check for Microsoft C extension: anonymous struct. 2369 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2370 CurContext->isRecord() && 2371 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2372 // Handle 2 kinds of anonymous struct: 2373 // struct STRUCT; 2374 // and 2375 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2376 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2377 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2378 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2379 DS.getRepAsType().get()->isStructureType())) { 2380 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2381 << DS.getSourceRange(); 2382 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2383 } 2384 } 2385 2386 if (getLangOptions().CPlusPlus && 2387 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2388 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2389 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2390 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2391 Diag(Enum->getLocation(), diag::ext_no_declarators) 2392 << DS.getSourceRange(); 2393 emittedWarning = true; 2394 } 2395 2396 // Skip all the checks below if we have a type error. 2397 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2398 2399 if (!DS.isMissingDeclaratorOk()) { 2400 // Warn about typedefs of enums without names, since this is an 2401 // extension in both Microsoft and GNU. 2402 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2403 Tag && isa<EnumDecl>(Tag)) { 2404 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2405 << DS.getSourceRange(); 2406 return Tag; 2407 } 2408 2409 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2410 << DS.getSourceRange(); 2411 emittedWarning = true; 2412 } 2413 2414 // We're going to complain about a bunch of spurious specifiers; 2415 // only do this if we're declaring a tag, because otherwise we 2416 // should be getting diag::ext_no_declarators. 2417 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2418 return TagD; 2419 2420 // Note that a linkage-specification sets a storage class, but 2421 // 'extern "C" struct foo;' is actually valid and not theoretically 2422 // useless. 2423 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2424 if (!DS.isExternInLinkageSpec()) 2425 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2426 << DeclSpec::getSpecifierName(scs); 2427 2428 if (DS.isThreadSpecified()) 2429 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2430 if (DS.getTypeQualifiers()) { 2431 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2432 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2433 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2434 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2435 // Restrict is covered above. 2436 } 2437 if (DS.isInlineSpecified()) 2438 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2439 if (DS.isVirtualSpecified()) 2440 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2441 if (DS.isExplicitSpecified()) 2442 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2443 2444 if (DS.isModulePrivateSpecified() && 2445 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2446 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2447 << Tag->getTagKind() 2448 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2449 2450 // FIXME: Warn on useless attributes 2451 2452 return TagD; 2453} 2454 2455/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2456/// builds a statement for it and returns it so it is evaluated. 2457StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2458 StmtResult R; 2459 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2460 Expr *Exp = DS.getRepAsExpr(); 2461 QualType Ty = Exp->getType(); 2462 if (Ty->isPointerType()) { 2463 do 2464 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2465 while (Ty->isPointerType()); 2466 } 2467 if (Ty->isVariableArrayType()) { 2468 R = ActOnExprStmt(MakeFullExpr(Exp)); 2469 } 2470 } 2471 return R; 2472} 2473 2474/// We are trying to inject an anonymous member into the given scope; 2475/// check if there's an existing declaration that can't be overloaded. 2476/// 2477/// \return true if this is a forbidden redeclaration 2478static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2479 Scope *S, 2480 DeclContext *Owner, 2481 DeclarationName Name, 2482 SourceLocation NameLoc, 2483 unsigned diagnostic) { 2484 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2485 Sema::ForRedeclaration); 2486 if (!SemaRef.LookupName(R, S)) return false; 2487 2488 if (R.getAsSingle<TagDecl>()) 2489 return false; 2490 2491 // Pick a representative declaration. 2492 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2493 assert(PrevDecl && "Expected a non-null Decl"); 2494 2495 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2496 return false; 2497 2498 SemaRef.Diag(NameLoc, diagnostic) << Name; 2499 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2500 2501 return true; 2502} 2503 2504/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2505/// anonymous struct or union AnonRecord into the owning context Owner 2506/// and scope S. This routine will be invoked just after we realize 2507/// that an unnamed union or struct is actually an anonymous union or 2508/// struct, e.g., 2509/// 2510/// @code 2511/// union { 2512/// int i; 2513/// float f; 2514/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2515/// // f into the surrounding scope.x 2516/// @endcode 2517/// 2518/// This routine is recursive, injecting the names of nested anonymous 2519/// structs/unions into the owning context and scope as well. 2520static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2521 DeclContext *Owner, 2522 RecordDecl *AnonRecord, 2523 AccessSpecifier AS, 2524 SmallVector<NamedDecl*, 2> &Chaining, 2525 bool MSAnonStruct) { 2526 unsigned diagKind 2527 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2528 : diag::err_anonymous_struct_member_redecl; 2529 2530 bool Invalid = false; 2531 2532 // Look every FieldDecl and IndirectFieldDecl with a name. 2533 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2534 DEnd = AnonRecord->decls_end(); 2535 D != DEnd; ++D) { 2536 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2537 cast<NamedDecl>(*D)->getDeclName()) { 2538 ValueDecl *VD = cast<ValueDecl>(*D); 2539 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2540 VD->getLocation(), diagKind)) { 2541 // C++ [class.union]p2: 2542 // The names of the members of an anonymous union shall be 2543 // distinct from the names of any other entity in the 2544 // scope in which the anonymous union is declared. 2545 Invalid = true; 2546 } else { 2547 // C++ [class.union]p2: 2548 // For the purpose of name lookup, after the anonymous union 2549 // definition, the members of the anonymous union are 2550 // considered to have been defined in the scope in which the 2551 // anonymous union is declared. 2552 unsigned OldChainingSize = Chaining.size(); 2553 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2554 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2555 PE = IF->chain_end(); PI != PE; ++PI) 2556 Chaining.push_back(*PI); 2557 else 2558 Chaining.push_back(VD); 2559 2560 assert(Chaining.size() >= 2); 2561 NamedDecl **NamedChain = 2562 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2563 for (unsigned i = 0; i < Chaining.size(); i++) 2564 NamedChain[i] = Chaining[i]; 2565 2566 IndirectFieldDecl* IndirectField = 2567 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2568 VD->getIdentifier(), VD->getType(), 2569 NamedChain, Chaining.size()); 2570 2571 IndirectField->setAccess(AS); 2572 IndirectField->setImplicit(); 2573 SemaRef.PushOnScopeChains(IndirectField, S); 2574 2575 // That includes picking up the appropriate access specifier. 2576 if (AS != AS_none) IndirectField->setAccess(AS); 2577 2578 Chaining.resize(OldChainingSize); 2579 } 2580 } 2581 } 2582 2583 return Invalid; 2584} 2585 2586/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2587/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2588/// illegal input values are mapped to SC_None. 2589static StorageClass 2590StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2591 switch (StorageClassSpec) { 2592 case DeclSpec::SCS_unspecified: return SC_None; 2593 case DeclSpec::SCS_extern: return SC_Extern; 2594 case DeclSpec::SCS_static: return SC_Static; 2595 case DeclSpec::SCS_auto: return SC_Auto; 2596 case DeclSpec::SCS_register: return SC_Register; 2597 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2598 // Illegal SCSs map to None: error reporting is up to the caller. 2599 case DeclSpec::SCS_mutable: // Fall through. 2600 case DeclSpec::SCS_typedef: return SC_None; 2601 } 2602 llvm_unreachable("unknown storage class specifier"); 2603} 2604 2605/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2606/// a StorageClass. Any error reporting is up to the caller: 2607/// illegal input values are mapped to SC_None. 2608static StorageClass 2609StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2610 switch (StorageClassSpec) { 2611 case DeclSpec::SCS_unspecified: return SC_None; 2612 case DeclSpec::SCS_extern: return SC_Extern; 2613 case DeclSpec::SCS_static: return SC_Static; 2614 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2615 // Illegal SCSs map to None: error reporting is up to the caller. 2616 case DeclSpec::SCS_auto: // Fall through. 2617 case DeclSpec::SCS_mutable: // Fall through. 2618 case DeclSpec::SCS_register: // Fall through. 2619 case DeclSpec::SCS_typedef: return SC_None; 2620 } 2621 llvm_unreachable("unknown storage class specifier"); 2622} 2623 2624/// BuildAnonymousStructOrUnion - Handle the declaration of an 2625/// anonymous structure or union. Anonymous unions are a C++ feature 2626/// (C++ [class.union]) and a GNU C extension; anonymous structures 2627/// are a GNU C and GNU C++ extension. 2628Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2629 AccessSpecifier AS, 2630 RecordDecl *Record) { 2631 DeclContext *Owner = Record->getDeclContext(); 2632 2633 // Diagnose whether this anonymous struct/union is an extension. 2634 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2635 Diag(Record->getLocation(), diag::ext_anonymous_union); 2636 else if (!Record->isUnion()) 2637 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2638 2639 // C and C++ require different kinds of checks for anonymous 2640 // structs/unions. 2641 bool Invalid = false; 2642 if (getLangOptions().CPlusPlus) { 2643 const char* PrevSpec = 0; 2644 unsigned DiagID; 2645 // C++ [class.union]p3: 2646 // Anonymous unions declared in a named namespace or in the 2647 // global namespace shall be declared static. 2648 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2649 (isa<TranslationUnitDecl>(Owner) || 2650 (isa<NamespaceDecl>(Owner) && 2651 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2652 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2653 Invalid = true; 2654 2655 // Recover by adding 'static'. 2656 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2657 PrevSpec, DiagID); 2658 } 2659 // C++ [class.union]p3: 2660 // A storage class is not allowed in a declaration of an 2661 // anonymous union in a class scope. 2662 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2663 isa<RecordDecl>(Owner)) { 2664 Diag(DS.getStorageClassSpecLoc(), 2665 diag::err_anonymous_union_with_storage_spec); 2666 Invalid = true; 2667 2668 // Recover by removing the storage specifier. 2669 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(), 2670 PrevSpec, DiagID); 2671 } 2672 2673 // Ignore const/volatile/restrict qualifiers. 2674 if (DS.getTypeQualifiers()) { 2675 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2676 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2677 << Record->isUnion() << 0 2678 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2679 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2680 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2681 << Record->isUnion() << 1 2682 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2683 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2684 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2685 << Record->isUnion() << 2 2686 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2687 2688 DS.ClearTypeQualifiers(); 2689 } 2690 2691 // C++ [class.union]p2: 2692 // The member-specification of an anonymous union shall only 2693 // define non-static data members. [Note: nested types and 2694 // functions cannot be declared within an anonymous union. ] 2695 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2696 MemEnd = Record->decls_end(); 2697 Mem != MemEnd; ++Mem) { 2698 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2699 // C++ [class.union]p3: 2700 // An anonymous union shall not have private or protected 2701 // members (clause 11). 2702 assert(FD->getAccess() != AS_none); 2703 if (FD->getAccess() != AS_public) { 2704 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2705 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2706 Invalid = true; 2707 } 2708 2709 // C++ [class.union]p1 2710 // An object of a class with a non-trivial constructor, a non-trivial 2711 // copy constructor, a non-trivial destructor, or a non-trivial copy 2712 // assignment operator cannot be a member of a union, nor can an 2713 // array of such objects. 2714 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2715 Invalid = true; 2716 } else if ((*Mem)->isImplicit()) { 2717 // Any implicit members are fine. 2718 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2719 // This is a type that showed up in an 2720 // elaborated-type-specifier inside the anonymous struct or 2721 // union, but which actually declares a type outside of the 2722 // anonymous struct or union. It's okay. 2723 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2724 if (!MemRecord->isAnonymousStructOrUnion() && 2725 MemRecord->getDeclName()) { 2726 // Visual C++ allows type definition in anonymous struct or union. 2727 if (getLangOptions().MicrosoftExt) 2728 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2729 << (int)Record->isUnion(); 2730 else { 2731 // This is a nested type declaration. 2732 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2733 << (int)Record->isUnion(); 2734 Invalid = true; 2735 } 2736 } 2737 } else if (isa<AccessSpecDecl>(*Mem)) { 2738 // Any access specifier is fine. 2739 } else { 2740 // We have something that isn't a non-static data 2741 // member. Complain about it. 2742 unsigned DK = diag::err_anonymous_record_bad_member; 2743 if (isa<TypeDecl>(*Mem)) 2744 DK = diag::err_anonymous_record_with_type; 2745 else if (isa<FunctionDecl>(*Mem)) 2746 DK = diag::err_anonymous_record_with_function; 2747 else if (isa<VarDecl>(*Mem)) 2748 DK = diag::err_anonymous_record_with_static; 2749 2750 // Visual C++ allows type definition in anonymous struct or union. 2751 if (getLangOptions().MicrosoftExt && 2752 DK == diag::err_anonymous_record_with_type) 2753 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2754 << (int)Record->isUnion(); 2755 else { 2756 Diag((*Mem)->getLocation(), DK) 2757 << (int)Record->isUnion(); 2758 Invalid = true; 2759 } 2760 } 2761 } 2762 } 2763 2764 if (!Record->isUnion() && !Owner->isRecord()) { 2765 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2766 << (int)getLangOptions().CPlusPlus; 2767 Invalid = true; 2768 } 2769 2770 // Mock up a declarator. 2771 Declarator Dc(DS, Declarator::MemberContext); 2772 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2773 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2774 2775 // Create a declaration for this anonymous struct/union. 2776 NamedDecl *Anon = 0; 2777 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2778 Anon = FieldDecl::Create(Context, OwningClass, 2779 DS.getSourceRange().getBegin(), 2780 Record->getLocation(), 2781 /*IdentifierInfo=*/0, 2782 Context.getTypeDeclType(Record), 2783 TInfo, 2784 /*BitWidth=*/0, /*Mutable=*/false, 2785 /*HasInit=*/false); 2786 Anon->setAccess(AS); 2787 if (getLangOptions().CPlusPlus) 2788 FieldCollector->Add(cast<FieldDecl>(Anon)); 2789 } else { 2790 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2791 assert(SCSpec != DeclSpec::SCS_typedef && 2792 "Parser allowed 'typedef' as storage class VarDecl."); 2793 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2794 if (SCSpec == DeclSpec::SCS_mutable) { 2795 // mutable can only appear on non-static class members, so it's always 2796 // an error here 2797 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2798 Invalid = true; 2799 SC = SC_None; 2800 } 2801 SCSpec = DS.getStorageClassSpecAsWritten(); 2802 VarDecl::StorageClass SCAsWritten 2803 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2804 2805 Anon = VarDecl::Create(Context, Owner, 2806 DS.getSourceRange().getBegin(), 2807 Record->getLocation(), /*IdentifierInfo=*/0, 2808 Context.getTypeDeclType(Record), 2809 TInfo, SC, SCAsWritten); 2810 2811 // Default-initialize the implicit variable. This initialization will be 2812 // trivial in almost all cases, except if a union member has an in-class 2813 // initializer: 2814 // union { int n = 0; }; 2815 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2816 } 2817 Anon->setImplicit(); 2818 2819 // Add the anonymous struct/union object to the current 2820 // context. We'll be referencing this object when we refer to one of 2821 // its members. 2822 Owner->addDecl(Anon); 2823 2824 // Inject the members of the anonymous struct/union into the owning 2825 // context and into the identifier resolver chain for name lookup 2826 // purposes. 2827 SmallVector<NamedDecl*, 2> Chain; 2828 Chain.push_back(Anon); 2829 2830 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2831 Chain, false)) 2832 Invalid = true; 2833 2834 // Mark this as an anonymous struct/union type. Note that we do not 2835 // do this until after we have already checked and injected the 2836 // members of this anonymous struct/union type, because otherwise 2837 // the members could be injected twice: once by DeclContext when it 2838 // builds its lookup table, and once by 2839 // InjectAnonymousStructOrUnionMembers. 2840 Record->setAnonymousStructOrUnion(true); 2841 2842 if (Invalid) 2843 Anon->setInvalidDecl(); 2844 2845 return Anon; 2846} 2847 2848/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2849/// Microsoft C anonymous structure. 2850/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2851/// Example: 2852/// 2853/// struct A { int a; }; 2854/// struct B { struct A; int b; }; 2855/// 2856/// void foo() { 2857/// B var; 2858/// var.a = 3; 2859/// } 2860/// 2861Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2862 RecordDecl *Record) { 2863 2864 // If there is no Record, get the record via the typedef. 2865 if (!Record) 2866 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2867 2868 // Mock up a declarator. 2869 Declarator Dc(DS, Declarator::TypeNameContext); 2870 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2871 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2872 2873 // Create a declaration for this anonymous struct. 2874 NamedDecl* Anon = FieldDecl::Create(Context, 2875 cast<RecordDecl>(CurContext), 2876 DS.getSourceRange().getBegin(), 2877 DS.getSourceRange().getBegin(), 2878 /*IdentifierInfo=*/0, 2879 Context.getTypeDeclType(Record), 2880 TInfo, 2881 /*BitWidth=*/0, /*Mutable=*/false, 2882 /*HasInit=*/false); 2883 Anon->setImplicit(); 2884 2885 // Add the anonymous struct object to the current context. 2886 CurContext->addDecl(Anon); 2887 2888 // Inject the members of the anonymous struct into the current 2889 // context and into the identifier resolver chain for name lookup 2890 // purposes. 2891 SmallVector<NamedDecl*, 2> Chain; 2892 Chain.push_back(Anon); 2893 2894 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2895 Record->getDefinition(), 2896 AS_none, Chain, true)) 2897 Anon->setInvalidDecl(); 2898 2899 return Anon; 2900} 2901 2902/// GetNameForDeclarator - Determine the full declaration name for the 2903/// given Declarator. 2904DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2905 return GetNameFromUnqualifiedId(D.getName()); 2906} 2907 2908/// \brief Retrieves the declaration name from a parsed unqualified-id. 2909DeclarationNameInfo 2910Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2911 DeclarationNameInfo NameInfo; 2912 NameInfo.setLoc(Name.StartLocation); 2913 2914 switch (Name.getKind()) { 2915 2916 case UnqualifiedId::IK_ImplicitSelfParam: 2917 case UnqualifiedId::IK_Identifier: 2918 NameInfo.setName(Name.Identifier); 2919 NameInfo.setLoc(Name.StartLocation); 2920 return NameInfo; 2921 2922 case UnqualifiedId::IK_OperatorFunctionId: 2923 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2924 Name.OperatorFunctionId.Operator)); 2925 NameInfo.setLoc(Name.StartLocation); 2926 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2927 = Name.OperatorFunctionId.SymbolLocations[0]; 2928 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2929 = Name.EndLocation.getRawEncoding(); 2930 return NameInfo; 2931 2932 case UnqualifiedId::IK_LiteralOperatorId: 2933 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2934 Name.Identifier)); 2935 NameInfo.setLoc(Name.StartLocation); 2936 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2937 return NameInfo; 2938 2939 case UnqualifiedId::IK_ConversionFunctionId: { 2940 TypeSourceInfo *TInfo; 2941 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2942 if (Ty.isNull()) 2943 return DeclarationNameInfo(); 2944 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2945 Context.getCanonicalType(Ty))); 2946 NameInfo.setLoc(Name.StartLocation); 2947 NameInfo.setNamedTypeInfo(TInfo); 2948 return NameInfo; 2949 } 2950 2951 case UnqualifiedId::IK_ConstructorName: { 2952 TypeSourceInfo *TInfo; 2953 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2954 if (Ty.isNull()) 2955 return DeclarationNameInfo(); 2956 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2957 Context.getCanonicalType(Ty))); 2958 NameInfo.setLoc(Name.StartLocation); 2959 NameInfo.setNamedTypeInfo(TInfo); 2960 return NameInfo; 2961 } 2962 2963 case UnqualifiedId::IK_ConstructorTemplateId: { 2964 // In well-formed code, we can only have a constructor 2965 // template-id that refers to the current context, so go there 2966 // to find the actual type being constructed. 2967 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2968 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2969 return DeclarationNameInfo(); 2970 2971 // Determine the type of the class being constructed. 2972 QualType CurClassType = Context.getTypeDeclType(CurClass); 2973 2974 // FIXME: Check two things: that the template-id names the same type as 2975 // CurClassType, and that the template-id does not occur when the name 2976 // was qualified. 2977 2978 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2979 Context.getCanonicalType(CurClassType))); 2980 NameInfo.setLoc(Name.StartLocation); 2981 // FIXME: should we retrieve TypeSourceInfo? 2982 NameInfo.setNamedTypeInfo(0); 2983 return NameInfo; 2984 } 2985 2986 case UnqualifiedId::IK_DestructorName: { 2987 TypeSourceInfo *TInfo; 2988 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2989 if (Ty.isNull()) 2990 return DeclarationNameInfo(); 2991 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2992 Context.getCanonicalType(Ty))); 2993 NameInfo.setLoc(Name.StartLocation); 2994 NameInfo.setNamedTypeInfo(TInfo); 2995 return NameInfo; 2996 } 2997 2998 case UnqualifiedId::IK_TemplateId: { 2999 TemplateName TName = Name.TemplateId->Template.get(); 3000 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3001 return Context.getNameForTemplate(TName, TNameLoc); 3002 } 3003 3004 } // switch (Name.getKind()) 3005 3006 llvm_unreachable("Unknown name kind"); 3007} 3008 3009static QualType getCoreType(QualType Ty) { 3010 do { 3011 if (Ty->isPointerType() || Ty->isReferenceType()) 3012 Ty = Ty->getPointeeType(); 3013 else if (Ty->isArrayType()) 3014 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3015 else 3016 return Ty.withoutLocalFastQualifiers(); 3017 } while (true); 3018} 3019 3020/// hasSimilarParameters - Determine whether the C++ functions Declaration 3021/// and Definition have "nearly" matching parameters. This heuristic is 3022/// used to improve diagnostics in the case where an out-of-line function 3023/// definition doesn't match any declaration within the class or namespace. 3024/// Also sets Params to the list of indices to the parameters that differ 3025/// between the declaration and the definition. If hasSimilarParameters 3026/// returns true and Params is empty, then all of the parameters match. 3027static bool hasSimilarParameters(ASTContext &Context, 3028 FunctionDecl *Declaration, 3029 FunctionDecl *Definition, 3030 llvm::SmallVectorImpl<unsigned> &Params) { 3031 Params.clear(); 3032 if (Declaration->param_size() != Definition->param_size()) 3033 return false; 3034 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3035 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3036 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3037 3038 // The parameter types are identical 3039 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3040 continue; 3041 3042 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3043 QualType DefParamBaseTy = getCoreType(DefParamTy); 3044 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3045 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3046 3047 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3048 (DeclTyName && DeclTyName == DefTyName)) 3049 Params.push_back(Idx); 3050 else // The two parameters aren't even close 3051 return false; 3052 } 3053 3054 return true; 3055} 3056 3057/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3058/// declarator needs to be rebuilt in the current instantiation. 3059/// Any bits of declarator which appear before the name are valid for 3060/// consideration here. That's specifically the type in the decl spec 3061/// and the base type in any member-pointer chunks. 3062static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3063 DeclarationName Name) { 3064 // The types we specifically need to rebuild are: 3065 // - typenames, typeofs, and decltypes 3066 // - types which will become injected class names 3067 // Of course, we also need to rebuild any type referencing such a 3068 // type. It's safest to just say "dependent", but we call out a 3069 // few cases here. 3070 3071 DeclSpec &DS = D.getMutableDeclSpec(); 3072 switch (DS.getTypeSpecType()) { 3073 case DeclSpec::TST_typename: 3074 case DeclSpec::TST_typeofType: 3075 case DeclSpec::TST_decltype: 3076 case DeclSpec::TST_underlyingType: 3077 case DeclSpec::TST_atomic: { 3078 // Grab the type from the parser. 3079 TypeSourceInfo *TSI = 0; 3080 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3081 if (T.isNull() || !T->isDependentType()) break; 3082 3083 // Make sure there's a type source info. This isn't really much 3084 // of a waste; most dependent types should have type source info 3085 // attached already. 3086 if (!TSI) 3087 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3088 3089 // Rebuild the type in the current instantiation. 3090 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3091 if (!TSI) return true; 3092 3093 // Store the new type back in the decl spec. 3094 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3095 DS.UpdateTypeRep(LocType); 3096 break; 3097 } 3098 3099 case DeclSpec::TST_typeofExpr: { 3100 Expr *E = DS.getRepAsExpr(); 3101 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3102 if (Result.isInvalid()) return true; 3103 DS.UpdateExprRep(Result.get()); 3104 break; 3105 } 3106 3107 default: 3108 // Nothing to do for these decl specs. 3109 break; 3110 } 3111 3112 // It doesn't matter what order we do this in. 3113 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3114 DeclaratorChunk &Chunk = D.getTypeObject(I); 3115 3116 // The only type information in the declarator which can come 3117 // before the declaration name is the base type of a member 3118 // pointer. 3119 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3120 continue; 3121 3122 // Rebuild the scope specifier in-place. 3123 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3124 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3125 return true; 3126 } 3127 3128 return false; 3129} 3130 3131Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3132 D.setFunctionDefinition(false); 3133 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3134} 3135 3136/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3137/// If T is the name of a class, then each of the following shall have a 3138/// name different from T: 3139/// - every static data member of class T; 3140/// - every member function of class T 3141/// - every member of class T that is itself a type; 3142/// \returns true if the declaration name violates these rules. 3143bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3144 DeclarationNameInfo NameInfo) { 3145 DeclarationName Name = NameInfo.getName(); 3146 3147 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3148 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3149 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3150 return true; 3151 } 3152 3153 return false; 3154} 3155 3156Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3157 MultiTemplateParamsArg TemplateParamLists) { 3158 // TODO: consider using NameInfo for diagnostic. 3159 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3160 DeclarationName Name = NameInfo.getName(); 3161 3162 // All of these full declarators require an identifier. If it doesn't have 3163 // one, the ParsedFreeStandingDeclSpec action should be used. 3164 if (!Name) { 3165 if (!D.isInvalidType()) // Reject this if we think it is valid. 3166 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3167 diag::err_declarator_need_ident) 3168 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3169 return 0; 3170 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3171 return 0; 3172 3173 // The scope passed in may not be a decl scope. Zip up the scope tree until 3174 // we find one that is. 3175 while ((S->getFlags() & Scope::DeclScope) == 0 || 3176 (S->getFlags() & Scope::TemplateParamScope) != 0) 3177 S = S->getParent(); 3178 3179 DeclContext *DC = CurContext; 3180 if (D.getCXXScopeSpec().isInvalid()) 3181 D.setInvalidType(); 3182 else if (D.getCXXScopeSpec().isSet()) { 3183 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3184 UPPC_DeclarationQualifier)) 3185 return 0; 3186 3187 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3188 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3189 if (!DC) { 3190 // If we could not compute the declaration context, it's because the 3191 // declaration context is dependent but does not refer to a class, 3192 // class template, or class template partial specialization. Complain 3193 // and return early, to avoid the coming semantic disaster. 3194 Diag(D.getIdentifierLoc(), 3195 diag::err_template_qualified_declarator_no_match) 3196 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3197 << D.getCXXScopeSpec().getRange(); 3198 return 0; 3199 } 3200 bool IsDependentContext = DC->isDependentContext(); 3201 3202 if (!IsDependentContext && 3203 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3204 return 0; 3205 3206 if (isa<CXXRecordDecl>(DC)) { 3207 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3208 Diag(D.getIdentifierLoc(), 3209 diag::err_member_def_undefined_record) 3210 << Name << DC << D.getCXXScopeSpec().getRange(); 3211 D.setInvalidType(); 3212 } else if (isa<CXXRecordDecl>(CurContext) && 3213 !D.getDeclSpec().isFriendSpecified()) { 3214 // The user provided a superfluous scope specifier inside a class 3215 // definition: 3216 // 3217 // class X { 3218 // void X::f(); 3219 // }; 3220 if (CurContext->Equals(DC)) 3221 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3222 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3223 else 3224 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3225 << Name << D.getCXXScopeSpec().getRange(); 3226 3227 // Pretend that this qualifier was not here. 3228 D.getCXXScopeSpec().clear(); 3229 } 3230 } 3231 3232 // Check whether we need to rebuild the type of the given 3233 // declaration in the current instantiation. 3234 if (EnteringContext && IsDependentContext && 3235 TemplateParamLists.size() != 0) { 3236 ContextRAII SavedContext(*this, DC); 3237 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3238 D.setInvalidType(); 3239 } 3240 } 3241 3242 if (DiagnoseClassNameShadow(DC, NameInfo)) 3243 // If this is a typedef, we'll end up spewing multiple diagnostics. 3244 // Just return early; it's safer. 3245 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3246 return 0; 3247 3248 NamedDecl *New; 3249 3250 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3251 QualType R = TInfo->getType(); 3252 3253 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3254 UPPC_DeclarationType)) 3255 D.setInvalidType(); 3256 3257 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3258 ForRedeclaration); 3259 3260 // See if this is a redefinition of a variable in the same scope. 3261 if (!D.getCXXScopeSpec().isSet()) { 3262 bool IsLinkageLookup = false; 3263 3264 // If the declaration we're planning to build will be a function 3265 // or object with linkage, then look for another declaration with 3266 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3267 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3268 /* Do nothing*/; 3269 else if (R->isFunctionType()) { 3270 if (CurContext->isFunctionOrMethod() || 3271 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3272 IsLinkageLookup = true; 3273 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3274 IsLinkageLookup = true; 3275 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3276 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3277 IsLinkageLookup = true; 3278 3279 if (IsLinkageLookup) 3280 Previous.clear(LookupRedeclarationWithLinkage); 3281 3282 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3283 } else { // Something like "int foo::x;" 3284 LookupQualifiedName(Previous, DC); 3285 3286 // Don't consider using declarations as previous declarations for 3287 // out-of-line members. 3288 RemoveUsingDecls(Previous); 3289 3290 // C++ 7.3.1.2p2: 3291 // Members (including explicit specializations of templates) of a named 3292 // namespace can also be defined outside that namespace by explicit 3293 // qualification of the name being defined, provided that the entity being 3294 // defined was already declared in the namespace and the definition appears 3295 // after the point of declaration in a namespace that encloses the 3296 // declarations namespace. 3297 // 3298 // Note that we only check the context at this point. We don't yet 3299 // have enough information to make sure that PrevDecl is actually 3300 // the declaration we want to match. For example, given: 3301 // 3302 // class X { 3303 // void f(); 3304 // void f(float); 3305 // }; 3306 // 3307 // void X::f(int) { } // ill-formed 3308 // 3309 // In this case, PrevDecl will point to the overload set 3310 // containing the two f's declared in X, but neither of them 3311 // matches. 3312 3313 // First check whether we named the global scope. 3314 if (isa<TranslationUnitDecl>(DC)) { 3315 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3316 << Name << D.getCXXScopeSpec().getRange(); 3317 } else { 3318 DeclContext *Cur = CurContext; 3319 while (isa<LinkageSpecDecl>(Cur)) 3320 Cur = Cur->getParent(); 3321 if (!Cur->Encloses(DC)) { 3322 // The qualifying scope doesn't enclose the original declaration. 3323 // Emit diagnostic based on current scope. 3324 SourceLocation L = D.getIdentifierLoc(); 3325 SourceRange R = D.getCXXScopeSpec().getRange(); 3326 if (isa<FunctionDecl>(Cur)) 3327 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3328 else 3329 Diag(L, diag::err_invalid_declarator_scope) 3330 << Name << cast<NamedDecl>(DC) << R; 3331 D.setInvalidType(); 3332 } 3333 } 3334 } 3335 3336 if (Previous.isSingleResult() && 3337 Previous.getFoundDecl()->isTemplateParameter()) { 3338 // Maybe we will complain about the shadowed template parameter. 3339 if (!D.isInvalidType()) 3340 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3341 Previous.getFoundDecl())) 3342 D.setInvalidType(); 3343 3344 // Just pretend that we didn't see the previous declaration. 3345 Previous.clear(); 3346 } 3347 3348 // In C++, the previous declaration we find might be a tag type 3349 // (class or enum). In this case, the new declaration will hide the 3350 // tag type. Note that this does does not apply if we're declaring a 3351 // typedef (C++ [dcl.typedef]p4). 3352 if (Previous.isSingleTagDecl() && 3353 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3354 Previous.clear(); 3355 3356 bool AddToScope = true; 3357 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3358 if (TemplateParamLists.size()) { 3359 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3360 return 0; 3361 } 3362 3363 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3364 } else if (R->isFunctionType()) { 3365 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3366 move(TemplateParamLists), 3367 AddToScope); 3368 } else { 3369 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3370 move(TemplateParamLists)); 3371 } 3372 3373 if (New == 0) 3374 return 0; 3375 3376 // If this has an identifier and is not an invalid redeclaration or 3377 // function template specialization, add it to the scope stack. 3378 if (New->getDeclName() && AddToScope && 3379 !(D.isRedeclaration() && New->isInvalidDecl())) 3380 PushOnScopeChains(New, S); 3381 3382 return New; 3383} 3384 3385/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3386/// types into constant array types in certain situations which would otherwise 3387/// be errors (for GCC compatibility). 3388static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3389 ASTContext &Context, 3390 bool &SizeIsNegative, 3391 llvm::APSInt &Oversized) { 3392 // This method tries to turn a variable array into a constant 3393 // array even when the size isn't an ICE. This is necessary 3394 // for compatibility with code that depends on gcc's buggy 3395 // constant expression folding, like struct {char x[(int)(char*)2];} 3396 SizeIsNegative = false; 3397 Oversized = 0; 3398 3399 if (T->isDependentType()) 3400 return QualType(); 3401 3402 QualifierCollector Qs; 3403 const Type *Ty = Qs.strip(T); 3404 3405 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3406 QualType Pointee = PTy->getPointeeType(); 3407 QualType FixedType = 3408 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3409 Oversized); 3410 if (FixedType.isNull()) return FixedType; 3411 FixedType = Context.getPointerType(FixedType); 3412 return Qs.apply(Context, FixedType); 3413 } 3414 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3415 QualType Inner = PTy->getInnerType(); 3416 QualType FixedType = 3417 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3418 Oversized); 3419 if (FixedType.isNull()) return FixedType; 3420 FixedType = Context.getParenType(FixedType); 3421 return Qs.apply(Context, FixedType); 3422 } 3423 3424 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3425 if (!VLATy) 3426 return QualType(); 3427 // FIXME: We should probably handle this case 3428 if (VLATy->getElementType()->isVariablyModifiedType()) 3429 return QualType(); 3430 3431 Expr::EvalResult EvalResult; 3432 if (!VLATy->getSizeExpr() || 3433 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3434 !EvalResult.Val.isInt()) 3435 return QualType(); 3436 3437 // Check whether the array size is negative. 3438 llvm::APSInt &Res = EvalResult.Val.getInt(); 3439 if (Res.isSigned() && Res.isNegative()) { 3440 SizeIsNegative = true; 3441 return QualType(); 3442 } 3443 3444 // Check whether the array is too large to be addressed. 3445 unsigned ActiveSizeBits 3446 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3447 Res); 3448 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3449 Oversized = Res; 3450 return QualType(); 3451 } 3452 3453 return Context.getConstantArrayType(VLATy->getElementType(), 3454 Res, ArrayType::Normal, 0); 3455} 3456 3457/// \brief Register the given locally-scoped external C declaration so 3458/// that it can be found later for redeclarations 3459void 3460Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3461 const LookupResult &Previous, 3462 Scope *S) { 3463 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3464 "Decl is not a locally-scoped decl!"); 3465 // Note that we have a locally-scoped external with this name. 3466 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3467 3468 if (!Previous.isSingleResult()) 3469 return; 3470 3471 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3472 3473 // If there was a previous declaration of this variable, it may be 3474 // in our identifier chain. Update the identifier chain with the new 3475 // declaration. 3476 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3477 // The previous declaration was found on the identifer resolver 3478 // chain, so remove it from its scope. 3479 3480 if (S->isDeclScope(PrevDecl)) { 3481 // Special case for redeclarations in the SAME scope. 3482 // Because this declaration is going to be added to the identifier chain 3483 // later, we should temporarily take it OFF the chain. 3484 IdResolver.RemoveDecl(ND); 3485 3486 } else { 3487 // Find the scope for the original declaration. 3488 while (S && !S->isDeclScope(PrevDecl)) 3489 S = S->getParent(); 3490 } 3491 3492 if (S) 3493 S->RemoveDecl(PrevDecl); 3494 } 3495} 3496 3497llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3498Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3499 if (ExternalSource) { 3500 // Load locally-scoped external decls from the external source. 3501 SmallVector<NamedDecl *, 4> Decls; 3502 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3503 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3504 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3505 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3506 if (Pos == LocallyScopedExternalDecls.end()) 3507 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3508 } 3509 } 3510 3511 return LocallyScopedExternalDecls.find(Name); 3512} 3513 3514/// \brief Diagnose function specifiers on a declaration of an identifier that 3515/// does not identify a function. 3516void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3517 // FIXME: We should probably indicate the identifier in question to avoid 3518 // confusion for constructs like "inline int a(), b;" 3519 if (D.getDeclSpec().isInlineSpecified()) 3520 Diag(D.getDeclSpec().getInlineSpecLoc(), 3521 diag::err_inline_non_function); 3522 3523 if (D.getDeclSpec().isVirtualSpecified()) 3524 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3525 diag::err_virtual_non_function); 3526 3527 if (D.getDeclSpec().isExplicitSpecified()) 3528 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3529 diag::err_explicit_non_function); 3530} 3531 3532NamedDecl* 3533Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3534 TypeSourceInfo *TInfo, LookupResult &Previous) { 3535 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3536 if (D.getCXXScopeSpec().isSet()) { 3537 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3538 << D.getCXXScopeSpec().getRange(); 3539 D.setInvalidType(); 3540 // Pretend we didn't see the scope specifier. 3541 DC = CurContext; 3542 Previous.clear(); 3543 } 3544 3545 if (getLangOptions().CPlusPlus) { 3546 // Check that there are no default arguments (C++ only). 3547 CheckExtraCXXDefaultArguments(D); 3548 } 3549 3550 DiagnoseFunctionSpecifiers(D); 3551 3552 if (D.getDeclSpec().isThreadSpecified()) 3553 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3554 if (D.getDeclSpec().isConstexprSpecified()) 3555 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3556 << 1; 3557 3558 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3559 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3560 << D.getName().getSourceRange(); 3561 return 0; 3562 } 3563 3564 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3565 if (!NewTD) return 0; 3566 3567 // Handle attributes prior to checking for duplicates in MergeVarDecl 3568 ProcessDeclAttributes(S, NewTD, D); 3569 3570 CheckTypedefForVariablyModifiedType(S, NewTD); 3571 3572 bool Redeclaration = D.isRedeclaration(); 3573 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3574 D.setRedeclaration(Redeclaration); 3575 return ND; 3576} 3577 3578void 3579Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3580 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3581 // then it shall have block scope. 3582 // Note that variably modified types must be fixed before merging the decl so 3583 // that redeclarations will match. 3584 QualType T = NewTD->getUnderlyingType(); 3585 if (T->isVariablyModifiedType()) { 3586 getCurFunction()->setHasBranchProtectedScope(); 3587 3588 if (S->getFnParent() == 0) { 3589 bool SizeIsNegative; 3590 llvm::APSInt Oversized; 3591 QualType FixedTy = 3592 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3593 Oversized); 3594 if (!FixedTy.isNull()) { 3595 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3596 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3597 } else { 3598 if (SizeIsNegative) 3599 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3600 else if (T->isVariableArrayType()) 3601 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3602 else if (Oversized.getBoolValue()) 3603 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3604 else 3605 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3606 NewTD->setInvalidDecl(); 3607 } 3608 } 3609 } 3610} 3611 3612 3613/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3614/// declares a typedef-name, either using the 'typedef' type specifier or via 3615/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3616NamedDecl* 3617Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3618 LookupResult &Previous, bool &Redeclaration) { 3619 // Merge the decl with the existing one if appropriate. If the decl is 3620 // in an outer scope, it isn't the same thing. 3621 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3622 /*ExplicitInstantiationOrSpecialization=*/false); 3623 if (!Previous.empty()) { 3624 Redeclaration = true; 3625 MergeTypedefNameDecl(NewTD, Previous); 3626 } 3627 3628 // If this is the C FILE type, notify the AST context. 3629 if (IdentifierInfo *II = NewTD->getIdentifier()) 3630 if (!NewTD->isInvalidDecl() && 3631 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3632 if (II->isStr("FILE")) 3633 Context.setFILEDecl(NewTD); 3634 else if (II->isStr("jmp_buf")) 3635 Context.setjmp_bufDecl(NewTD); 3636 else if (II->isStr("sigjmp_buf")) 3637 Context.setsigjmp_bufDecl(NewTD); 3638 else if (II->isStr("__builtin_va_list")) 3639 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3640 } 3641 3642 return NewTD; 3643} 3644 3645/// \brief Determines whether the given declaration is an out-of-scope 3646/// previous declaration. 3647/// 3648/// This routine should be invoked when name lookup has found a 3649/// previous declaration (PrevDecl) that is not in the scope where a 3650/// new declaration by the same name is being introduced. If the new 3651/// declaration occurs in a local scope, previous declarations with 3652/// linkage may still be considered previous declarations (C99 3653/// 6.2.2p4-5, C++ [basic.link]p6). 3654/// 3655/// \param PrevDecl the previous declaration found by name 3656/// lookup 3657/// 3658/// \param DC the context in which the new declaration is being 3659/// declared. 3660/// 3661/// \returns true if PrevDecl is an out-of-scope previous declaration 3662/// for a new delcaration with the same name. 3663static bool 3664isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3665 ASTContext &Context) { 3666 if (!PrevDecl) 3667 return false; 3668 3669 if (!PrevDecl->hasLinkage()) 3670 return false; 3671 3672 if (Context.getLangOptions().CPlusPlus) { 3673 // C++ [basic.link]p6: 3674 // If there is a visible declaration of an entity with linkage 3675 // having the same name and type, ignoring entities declared 3676 // outside the innermost enclosing namespace scope, the block 3677 // scope declaration declares that same entity and receives the 3678 // linkage of the previous declaration. 3679 DeclContext *OuterContext = DC->getRedeclContext(); 3680 if (!OuterContext->isFunctionOrMethod()) 3681 // This rule only applies to block-scope declarations. 3682 return false; 3683 3684 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3685 if (PrevOuterContext->isRecord()) 3686 // We found a member function: ignore it. 3687 return false; 3688 3689 // Find the innermost enclosing namespace for the new and 3690 // previous declarations. 3691 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3692 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3693 3694 // The previous declaration is in a different namespace, so it 3695 // isn't the same function. 3696 if (!OuterContext->Equals(PrevOuterContext)) 3697 return false; 3698 } 3699 3700 return true; 3701} 3702 3703static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3704 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3705 if (!SS.isSet()) return; 3706 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3707} 3708 3709bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3710 QualType type = decl->getType(); 3711 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3712 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3713 // Various kinds of declaration aren't allowed to be __autoreleasing. 3714 unsigned kind = -1U; 3715 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3716 if (var->hasAttr<BlocksAttr>()) 3717 kind = 0; // __block 3718 else if (!var->hasLocalStorage()) 3719 kind = 1; // global 3720 } else if (isa<ObjCIvarDecl>(decl)) { 3721 kind = 3; // ivar 3722 } else if (isa<FieldDecl>(decl)) { 3723 kind = 2; // field 3724 } 3725 3726 if (kind != -1U) { 3727 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3728 << kind; 3729 } 3730 } else if (lifetime == Qualifiers::OCL_None) { 3731 // Try to infer lifetime. 3732 if (!type->isObjCLifetimeType()) 3733 return false; 3734 3735 lifetime = type->getObjCARCImplicitLifetime(); 3736 type = Context.getLifetimeQualifiedType(type, lifetime); 3737 decl->setType(type); 3738 } 3739 3740 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3741 // Thread-local variables cannot have lifetime. 3742 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3743 var->isThreadSpecified()) { 3744 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3745 << var->getType(); 3746 return true; 3747 } 3748 } 3749 3750 return false; 3751} 3752 3753NamedDecl* 3754Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3755 TypeSourceInfo *TInfo, LookupResult &Previous, 3756 MultiTemplateParamsArg TemplateParamLists) { 3757 QualType R = TInfo->getType(); 3758 DeclarationName Name = GetNameForDeclarator(D).getName(); 3759 3760 // Check that there are no default arguments (C++ only). 3761 if (getLangOptions().CPlusPlus) 3762 CheckExtraCXXDefaultArguments(D); 3763 3764 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3765 assert(SCSpec != DeclSpec::SCS_typedef && 3766 "Parser allowed 'typedef' as storage class VarDecl."); 3767 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3768 if (SCSpec == DeclSpec::SCS_mutable) { 3769 // mutable can only appear on non-static class members, so it's always 3770 // an error here 3771 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3772 D.setInvalidType(); 3773 SC = SC_None; 3774 } 3775 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3776 VarDecl::StorageClass SCAsWritten 3777 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3778 3779 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3780 if (!II) { 3781 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3782 << Name; 3783 return 0; 3784 } 3785 3786 DiagnoseFunctionSpecifiers(D); 3787 3788 if (!DC->isRecord() && S->getFnParent() == 0) { 3789 // C99 6.9p2: The storage-class specifiers auto and register shall not 3790 // appear in the declaration specifiers in an external declaration. 3791 if (SC == SC_Auto || SC == SC_Register) { 3792 3793 // If this is a register variable with an asm label specified, then this 3794 // is a GNU extension. 3795 if (SC == SC_Register && D.getAsmLabel()) 3796 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3797 else 3798 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3799 D.setInvalidType(); 3800 } 3801 } 3802 3803 if (getLangOptions().OpenCL) { 3804 // Set up the special work-group-local storage class for variables in the 3805 // OpenCL __local address space. 3806 if (R.getAddressSpace() == LangAS::opencl_local) 3807 SC = SC_OpenCLWorkGroupLocal; 3808 } 3809 3810 bool isExplicitSpecialization = false; 3811 VarDecl *NewVD; 3812 if (!getLangOptions().CPlusPlus) { 3813 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3814 D.getIdentifierLoc(), II, 3815 R, TInfo, SC, SCAsWritten); 3816 3817 if (D.isInvalidType()) 3818 NewVD->setInvalidDecl(); 3819 } else { 3820 if (DC->isRecord() && !CurContext->isRecord()) { 3821 // This is an out-of-line definition of a static data member. 3822 if (SC == SC_Static) { 3823 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3824 diag::err_static_out_of_line) 3825 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3826 } else if (SC == SC_None) 3827 SC = SC_Static; 3828 } 3829 if (SC == SC_Static) { 3830 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3831 if (RD->isLocalClass()) 3832 Diag(D.getIdentifierLoc(), 3833 diag::err_static_data_member_not_allowed_in_local_class) 3834 << Name << RD->getDeclName(); 3835 3836 // C++ [class.union]p1: If a union contains a static data member, 3837 // the program is ill-formed. 3838 // 3839 // We also disallow static data members in anonymous structs. 3840 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3841 Diag(D.getIdentifierLoc(), 3842 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3843 << Name << RD->isUnion(); 3844 } 3845 } 3846 3847 // Match up the template parameter lists with the scope specifier, then 3848 // determine whether we have a template or a template specialization. 3849 isExplicitSpecialization = false; 3850 bool Invalid = false; 3851 if (TemplateParameterList *TemplateParams 3852 = MatchTemplateParametersToScopeSpecifier( 3853 D.getDeclSpec().getSourceRange().getBegin(), 3854 D.getIdentifierLoc(), 3855 D.getCXXScopeSpec(), 3856 TemplateParamLists.get(), 3857 TemplateParamLists.size(), 3858 /*never a friend*/ false, 3859 isExplicitSpecialization, 3860 Invalid)) { 3861 if (TemplateParams->size() > 0) { 3862 // There is no such thing as a variable template. 3863 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3864 << II 3865 << SourceRange(TemplateParams->getTemplateLoc(), 3866 TemplateParams->getRAngleLoc()); 3867 return 0; 3868 } else { 3869 // There is an extraneous 'template<>' for this variable. Complain 3870 // about it, but allow the declaration of the variable. 3871 Diag(TemplateParams->getTemplateLoc(), 3872 diag::err_template_variable_noparams) 3873 << II 3874 << SourceRange(TemplateParams->getTemplateLoc(), 3875 TemplateParams->getRAngleLoc()); 3876 } 3877 } 3878 3879 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3880 D.getIdentifierLoc(), II, 3881 R, TInfo, SC, SCAsWritten); 3882 3883 // If this decl has an auto type in need of deduction, make a note of the 3884 // Decl so we can diagnose uses of it in its own initializer. 3885 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3886 R->getContainedAutoType()) 3887 ParsingInitForAutoVars.insert(NewVD); 3888 3889 if (D.isInvalidType() || Invalid) 3890 NewVD->setInvalidDecl(); 3891 3892 SetNestedNameSpecifier(NewVD, D); 3893 3894 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3895 NewVD->setTemplateParameterListsInfo(Context, 3896 TemplateParamLists.size(), 3897 TemplateParamLists.release()); 3898 } 3899 3900 if (D.getDeclSpec().isConstexprSpecified()) { 3901 // FIXME: once we know whether there's an initializer, apply this to 3902 // static data members too. 3903 if (!NewVD->isStaticDataMember() && 3904 !NewVD->isThisDeclarationADefinition()) { 3905 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3906 // of a variable. Suggest replacing it with 'const' if appropriate. 3907 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3908 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3909 // If the declarator is complex, we need to move the keyword to the 3910 // innermost chunk as we switch it from 'constexpr' to 'const'. 3911 int Kind = DeclaratorChunk::Paren; 3912 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3913 Kind = D.getTypeObject(I).Kind; 3914 if (Kind != DeclaratorChunk::Paren) 3915 break; 3916 } 3917 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3918 Kind == DeclaratorChunk::Reference) 3919 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3920 << FixItHint::CreateRemoval(ConstexprRange); 3921 else if (Kind == DeclaratorChunk::Paren) 3922 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3923 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3924 else 3925 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3926 << FixItHint::CreateRemoval(ConstexprRange) 3927 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3928 } else { 3929 NewVD->setConstexpr(true); 3930 } 3931 } 3932 } 3933 3934 // Set the lexical context. If the declarator has a C++ scope specifier, the 3935 // lexical context will be different from the semantic context. 3936 NewVD->setLexicalDeclContext(CurContext); 3937 3938 if (D.getDeclSpec().isThreadSpecified()) { 3939 if (NewVD->hasLocalStorage()) 3940 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3941 else if (!Context.getTargetInfo().isTLSSupported()) 3942 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3943 else 3944 NewVD->setThreadSpecified(true); 3945 } 3946 3947 if (D.getDeclSpec().isModulePrivateSpecified()) { 3948 if (isExplicitSpecialization) 3949 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3950 << 2 3951 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3952 else if (NewVD->hasLocalStorage()) 3953 Diag(NewVD->getLocation(), diag::err_module_private_local) 3954 << 0 << NewVD->getDeclName() 3955 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3956 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3957 else 3958 NewVD->setModulePrivate(); 3959 } 3960 3961 // Handle attributes prior to checking for duplicates in MergeVarDecl 3962 ProcessDeclAttributes(S, NewVD, D); 3963 3964 // In auto-retain/release, infer strong retension for variables of 3965 // retainable type. 3966 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3967 NewVD->setInvalidDecl(); 3968 3969 // Handle GNU asm-label extension (encoded as an attribute). 3970 if (Expr *E = (Expr*)D.getAsmLabel()) { 3971 // The parser guarantees this is a string. 3972 StringLiteral *SE = cast<StringLiteral>(E); 3973 StringRef Label = SE->getString(); 3974 if (S->getFnParent() != 0) { 3975 switch (SC) { 3976 case SC_None: 3977 case SC_Auto: 3978 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3979 break; 3980 case SC_Register: 3981 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3982 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3983 break; 3984 case SC_Static: 3985 case SC_Extern: 3986 case SC_PrivateExtern: 3987 case SC_OpenCLWorkGroupLocal: 3988 break; 3989 } 3990 } 3991 3992 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3993 Context, Label)); 3994 } 3995 3996 // Diagnose shadowed variables before filtering for scope. 3997 if (!D.getCXXScopeSpec().isSet()) 3998 CheckShadow(S, NewVD, Previous); 3999 4000 // Don't consider existing declarations that are in a different 4001 // scope and are out-of-semantic-context declarations (if the new 4002 // declaration has linkage). 4003 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4004 isExplicitSpecialization); 4005 4006 if (!getLangOptions().CPlusPlus) { 4007 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4008 } else { 4009 // Merge the decl with the existing one if appropriate. 4010 if (!Previous.empty()) { 4011 if (Previous.isSingleResult() && 4012 isa<FieldDecl>(Previous.getFoundDecl()) && 4013 D.getCXXScopeSpec().isSet()) { 4014 // The user tried to define a non-static data member 4015 // out-of-line (C++ [dcl.meaning]p1). 4016 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4017 << D.getCXXScopeSpec().getRange(); 4018 Previous.clear(); 4019 NewVD->setInvalidDecl(); 4020 } 4021 } else if (D.getCXXScopeSpec().isSet()) { 4022 // No previous declaration in the qualifying scope. 4023 Diag(D.getIdentifierLoc(), diag::err_no_member) 4024 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4025 << D.getCXXScopeSpec().getRange(); 4026 NewVD->setInvalidDecl(); 4027 } 4028 4029 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4030 4031 // This is an explicit specialization of a static data member. Check it. 4032 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4033 CheckMemberSpecialization(NewVD, Previous)) 4034 NewVD->setInvalidDecl(); 4035 } 4036 4037 // attributes declared post-definition are currently ignored 4038 // FIXME: This should be handled in attribute merging, not 4039 // here. 4040 if (Previous.isSingleResult()) { 4041 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4042 if (Def && (Def = Def->getDefinition()) && 4043 Def != NewVD && D.hasAttributes()) { 4044 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4045 Diag(Def->getLocation(), diag::note_previous_definition); 4046 } 4047 } 4048 4049 // If this is a locally-scoped extern C variable, update the map of 4050 // such variables. 4051 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4052 !NewVD->isInvalidDecl()) 4053 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4054 4055 // If there's a #pragma GCC visibility in scope, and this isn't a class 4056 // member, set the visibility of this variable. 4057 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4058 AddPushedVisibilityAttribute(NewVD); 4059 4060 MarkUnusedFileScopedDecl(NewVD); 4061 4062 return NewVD; 4063} 4064 4065/// \brief Diagnose variable or built-in function shadowing. Implements 4066/// -Wshadow. 4067/// 4068/// This method is called whenever a VarDecl is added to a "useful" 4069/// scope. 4070/// 4071/// \param S the scope in which the shadowing name is being declared 4072/// \param R the lookup of the name 4073/// 4074void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4075 // Return if warning is ignored. 4076 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4077 DiagnosticsEngine::Ignored) 4078 return; 4079 4080 // Don't diagnose declarations at file scope. 4081 if (D->hasGlobalStorage()) 4082 return; 4083 4084 DeclContext *NewDC = D->getDeclContext(); 4085 4086 // Only diagnose if we're shadowing an unambiguous field or variable. 4087 if (R.getResultKind() != LookupResult::Found) 4088 return; 4089 4090 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4091 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4092 return; 4093 4094 // Fields are not shadowed by variables in C++ static methods. 4095 if (isa<FieldDecl>(ShadowedDecl)) 4096 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4097 if (MD->isStatic()) 4098 return; 4099 4100 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4101 if (shadowedVar->isExternC()) { 4102 // For shadowing external vars, make sure that we point to the global 4103 // declaration, not a locally scoped extern declaration. 4104 for (VarDecl::redecl_iterator 4105 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4106 I != E; ++I) 4107 if (I->isFileVarDecl()) { 4108 ShadowedDecl = *I; 4109 break; 4110 } 4111 } 4112 4113 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4114 4115 // Only warn about certain kinds of shadowing for class members. 4116 if (NewDC && NewDC->isRecord()) { 4117 // In particular, don't warn about shadowing non-class members. 4118 if (!OldDC->isRecord()) 4119 return; 4120 4121 // TODO: should we warn about static data members shadowing 4122 // static data members from base classes? 4123 4124 // TODO: don't diagnose for inaccessible shadowed members. 4125 // This is hard to do perfectly because we might friend the 4126 // shadowing context, but that's just a false negative. 4127 } 4128 4129 // Determine what kind of declaration we're shadowing. 4130 unsigned Kind; 4131 if (isa<RecordDecl>(OldDC)) { 4132 if (isa<FieldDecl>(ShadowedDecl)) 4133 Kind = 3; // field 4134 else 4135 Kind = 2; // static data member 4136 } else if (OldDC->isFileContext()) 4137 Kind = 1; // global 4138 else 4139 Kind = 0; // local 4140 4141 DeclarationName Name = R.getLookupName(); 4142 4143 // Emit warning and note. 4144 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4145 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4146} 4147 4148/// \brief Check -Wshadow without the advantage of a previous lookup. 4149void Sema::CheckShadow(Scope *S, VarDecl *D) { 4150 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4151 DiagnosticsEngine::Ignored) 4152 return; 4153 4154 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4155 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4156 LookupName(R, S); 4157 CheckShadow(S, D, R); 4158} 4159 4160/// \brief Perform semantic checking on a newly-created variable 4161/// declaration. 4162/// 4163/// This routine performs all of the type-checking required for a 4164/// variable declaration once it has been built. It is used both to 4165/// check variables after they have been parsed and their declarators 4166/// have been translated into a declaration, and to check variables 4167/// that have been instantiated from a template. 4168/// 4169/// Sets NewVD->isInvalidDecl() if an error was encountered. 4170/// 4171/// Returns true if the variable declaration is a redeclaration. 4172bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4173 LookupResult &Previous) { 4174 // If the decl is already known invalid, don't check it. 4175 if (NewVD->isInvalidDecl()) 4176 return false; 4177 4178 QualType T = NewVD->getType(); 4179 4180 if (T->isObjCObjectType()) { 4181 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4182 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4183 T = Context.getObjCObjectPointerType(T); 4184 NewVD->setType(T); 4185 } 4186 4187 // Emit an error if an address space was applied to decl with local storage. 4188 // This includes arrays of objects with address space qualifiers, but not 4189 // automatic variables that point to other address spaces. 4190 // ISO/IEC TR 18037 S5.1.2 4191 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4192 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4193 NewVD->setInvalidDecl(); 4194 return false; 4195 } 4196 4197 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4198 && !NewVD->hasAttr<BlocksAttr>()) { 4199 if (getLangOptions().getGC() != LangOptions::NonGC) 4200 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4201 else 4202 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4203 } 4204 4205 bool isVM = T->isVariablyModifiedType(); 4206 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4207 NewVD->hasAttr<BlocksAttr>()) 4208 getCurFunction()->setHasBranchProtectedScope(); 4209 4210 if ((isVM && NewVD->hasLinkage()) || 4211 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4212 bool SizeIsNegative; 4213 llvm::APSInt Oversized; 4214 QualType FixedTy = 4215 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4216 Oversized); 4217 4218 if (FixedTy.isNull() && T->isVariableArrayType()) { 4219 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4220 // FIXME: This won't give the correct result for 4221 // int a[10][n]; 4222 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4223 4224 if (NewVD->isFileVarDecl()) 4225 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4226 << SizeRange; 4227 else if (NewVD->getStorageClass() == SC_Static) 4228 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4229 << SizeRange; 4230 else 4231 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4232 << SizeRange; 4233 NewVD->setInvalidDecl(); 4234 return false; 4235 } 4236 4237 if (FixedTy.isNull()) { 4238 if (NewVD->isFileVarDecl()) 4239 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4240 else 4241 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4242 NewVD->setInvalidDecl(); 4243 return false; 4244 } 4245 4246 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4247 NewVD->setType(FixedTy); 4248 } 4249 4250 if (Previous.empty() && NewVD->isExternC()) { 4251 // Since we did not find anything by this name and we're declaring 4252 // an extern "C" variable, look for a non-visible extern "C" 4253 // declaration with the same name. 4254 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4255 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4256 if (Pos != LocallyScopedExternalDecls.end()) 4257 Previous.addDecl(Pos->second); 4258 } 4259 4260 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4261 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4262 << T; 4263 NewVD->setInvalidDecl(); 4264 return false; 4265 } 4266 4267 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4268 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4269 NewVD->setInvalidDecl(); 4270 return false; 4271 } 4272 4273 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4274 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4275 NewVD->setInvalidDecl(); 4276 return false; 4277 } 4278 4279 // Function pointers and references cannot have qualified function type, only 4280 // function pointer-to-members can do that. 4281 QualType Pointee; 4282 unsigned PtrOrRef = 0; 4283 if (const PointerType *Ptr = T->getAs<PointerType>()) 4284 Pointee = Ptr->getPointeeType(); 4285 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4286 Pointee = Ref->getPointeeType(); 4287 PtrOrRef = 1; 4288 } 4289 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4290 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4291 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4292 << PtrOrRef; 4293 NewVD->setInvalidDecl(); 4294 return false; 4295 } 4296 4297 if (!Previous.empty()) { 4298 MergeVarDecl(NewVD, Previous); 4299 return true; 4300 } 4301 return false; 4302} 4303 4304/// \brief Data used with FindOverriddenMethod 4305struct FindOverriddenMethodData { 4306 Sema *S; 4307 CXXMethodDecl *Method; 4308}; 4309 4310/// \brief Member lookup function that determines whether a given C++ 4311/// method overrides a method in a base class, to be used with 4312/// CXXRecordDecl::lookupInBases(). 4313static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4314 CXXBasePath &Path, 4315 void *UserData) { 4316 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4317 4318 FindOverriddenMethodData *Data 4319 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4320 4321 DeclarationName Name = Data->Method->getDeclName(); 4322 4323 // FIXME: Do we care about other names here too? 4324 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4325 // We really want to find the base class destructor here. 4326 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4327 CanQualType CT = Data->S->Context.getCanonicalType(T); 4328 4329 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4330 } 4331 4332 for (Path.Decls = BaseRecord->lookup(Name); 4333 Path.Decls.first != Path.Decls.second; 4334 ++Path.Decls.first) { 4335 NamedDecl *D = *Path.Decls.first; 4336 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4337 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4338 return true; 4339 } 4340 } 4341 4342 return false; 4343} 4344 4345/// AddOverriddenMethods - See if a method overrides any in the base classes, 4346/// and if so, check that it's a valid override and remember it. 4347bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4348 // Look for virtual methods in base classes that this method might override. 4349 CXXBasePaths Paths; 4350 FindOverriddenMethodData Data; 4351 Data.Method = MD; 4352 Data.S = this; 4353 bool AddedAny = false; 4354 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4355 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4356 E = Paths.found_decls_end(); I != E; ++I) { 4357 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4358 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4359 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4360 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4361 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4362 AddedAny = true; 4363 } 4364 } 4365 } 4366 } 4367 4368 return AddedAny; 4369} 4370 4371namespace { 4372 // Struct for holding all of the extra arguments needed by 4373 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4374 struct ActOnFDArgs { 4375 Scope *S; 4376 Declarator &D; 4377 MultiTemplateParamsArg TemplateParamLists; 4378 bool AddToScope; 4379 }; 4380} 4381 4382/// \brief Generate diagnostics for an invalid function redeclaration. 4383/// 4384/// This routine handles generating the diagnostic messages for an invalid 4385/// function redeclaration, including finding possible similar declarations 4386/// or performing typo correction if there are no previous declarations with 4387/// the same name. 4388/// 4389/// Returns a NamedDecl iff typo correction was performed and substituting in 4390/// the new declaration name does not cause new errors. 4391static NamedDecl* DiagnoseInvalidRedeclaration( 4392 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4393 ActOnFDArgs &ExtraArgs) { 4394 NamedDecl *Result = NULL; 4395 DeclarationName Name = NewFD->getDeclName(); 4396 DeclContext *NewDC = NewFD->getDeclContext(); 4397 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4398 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4399 llvm::SmallVector<unsigned, 1> MismatchedParams; 4400 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4401 TypoCorrection Correction; 4402 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4403 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4404 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4405 : diag::err_member_def_does_not_match; 4406 4407 NewFD->setInvalidDecl(); 4408 SemaRef.LookupQualifiedName(Prev, NewDC); 4409 assert(!Prev.isAmbiguous() && 4410 "Cannot have an ambiguity in previous-declaration lookup"); 4411 if (!Prev.empty()) { 4412 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4413 Func != FuncEnd; ++Func) { 4414 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4415 if (FD && 4416 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4417 // Add 1 to the index so that 0 can mean the mismatch didn't 4418 // involve a parameter 4419 unsigned ParamNum = 4420 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4421 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4422 } 4423 } 4424 // If the qualified name lookup yielded nothing, try typo correction 4425 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4426 Prev.getLookupKind(), 0, 0, NewDC)) && 4427 Correction.getCorrection() != Name) { 4428 // Trap errors. 4429 Sema::SFINAETrap Trap(SemaRef); 4430 4431 // Set up everything for the call to ActOnFunctionDeclarator 4432 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4433 ExtraArgs.D.getIdentifierLoc()); 4434 Previous.clear(); 4435 Previous.setLookupName(Correction.getCorrection()); 4436 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4437 CDeclEnd = Correction.end(); 4438 CDecl != CDeclEnd; ++CDecl) { 4439 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4440 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4441 MismatchedParams)) { 4442 Previous.addDecl(FD); 4443 } 4444 } 4445 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4446 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4447 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4448 // eliminate the need for the parameter pack ExtraArgs. 4449 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4450 NewFD->getDeclContext(), 4451 NewFD->getTypeSourceInfo(), 4452 Previous, 4453 ExtraArgs.TemplateParamLists, 4454 ExtraArgs.AddToScope); 4455 if (Trap.hasErrorOccurred()) { 4456 // Pretend the typo correction never occurred 4457 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4458 ExtraArgs.D.getIdentifierLoc()); 4459 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4460 Previous.clear(); 4461 Previous.setLookupName(Name); 4462 Result = NULL; 4463 } else { 4464 for (LookupResult::iterator Func = Previous.begin(), 4465 FuncEnd = Previous.end(); 4466 Func != FuncEnd; ++Func) { 4467 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4468 NearMatches.push_back(std::make_pair(FD, 0)); 4469 } 4470 } 4471 if (NearMatches.empty()) { 4472 // Ignore the correction if it didn't yield any close FunctionDecl matches 4473 Correction = TypoCorrection(); 4474 } else { 4475 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4476 : diag::err_member_def_does_not_match_suggest; 4477 } 4478 } 4479 4480 if (Correction) 4481 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4482 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4483 << FixItHint::CreateReplacement( 4484 NewFD->getLocation(), 4485 Correction.getAsString(SemaRef.getLangOptions())); 4486 else 4487 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4488 << Name << NewDC << NewFD->getLocation(); 4489 4490 bool NewFDisConst = false; 4491 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4492 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4493 4494 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4495 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4496 NearMatch != NearMatchEnd; ++NearMatch) { 4497 FunctionDecl *FD = NearMatch->first; 4498 bool FDisConst = false; 4499 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4500 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4501 4502 if (unsigned Idx = NearMatch->second) { 4503 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4504 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4505 diag::note_member_def_close_param_match) 4506 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4507 } else if (Correction) { 4508 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4509 << Correction.getQuoted(SemaRef.getLangOptions()); 4510 } else if (FDisConst != NewFDisConst) { 4511 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4512 << NewFDisConst << FD->getSourceRange().getEnd(); 4513 } else 4514 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4515 } 4516 return Result; 4517} 4518 4519static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) { 4520 switch (D.getDeclSpec().getStorageClassSpec()) { 4521 default: llvm_unreachable("Unknown storage class!"); 4522 case DeclSpec::SCS_auto: 4523 case DeclSpec::SCS_register: 4524 case DeclSpec::SCS_mutable: 4525 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4526 diag::err_typecheck_sclass_func); 4527 D.setInvalidType(); 4528 break; 4529 case DeclSpec::SCS_unspecified: break; 4530 case DeclSpec::SCS_extern: return SC_Extern; 4531 case DeclSpec::SCS_static: { 4532 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4533 // C99 6.7.1p5: 4534 // The declaration of an identifier for a function that has 4535 // block scope shall have no explicit storage-class specifier 4536 // other than extern 4537 // See also (C++ [dcl.stc]p4). 4538 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4539 diag::err_static_block_func); 4540 break; 4541 } else 4542 return SC_Static; 4543 } 4544 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4545 } 4546 4547 // No explicit storage class has already been returned 4548 return SC_None; 4549} 4550 4551static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4552 DeclContext *DC, QualType &R, 4553 TypeSourceInfo *TInfo, 4554 FunctionDecl::StorageClass SC, 4555 bool &IsVirtualOkay) { 4556 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4557 DeclarationName Name = NameInfo.getName(); 4558 4559 FunctionDecl *NewFD = 0; 4560 bool isInline = D.getDeclSpec().isInlineSpecified(); 4561 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4562 FunctionDecl::StorageClass SCAsWritten 4563 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4564 4565 if (!SemaRef.getLangOptions().CPlusPlus) { 4566 // Determine whether the function was written with a 4567 // prototype. This true when: 4568 // - there is a prototype in the declarator, or 4569 // - the type R of the function is some kind of typedef or other reference 4570 // to a type name (which eventually refers to a function type). 4571 bool HasPrototype = 4572 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4573 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4574 4575 NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getSourceRange().getBegin(), 4576 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4577 HasPrototype); 4578 if (D.isInvalidType()) 4579 NewFD->setInvalidDecl(); 4580 4581 // Set the lexical context. 4582 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4583 4584 return NewFD; 4585 } 4586 4587 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4588 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4589 4590 // Check that the return type is not an abstract class type. 4591 // For record types, this is done by the AbstractClassUsageDiagnoser once 4592 // the class has been completely parsed. 4593 if (!DC->isRecord() && 4594 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4595 R->getAs<FunctionType>()->getResultType(), 4596 diag::err_abstract_type_in_decl, 4597 SemaRef.AbstractReturnType)) 4598 D.setInvalidType(); 4599 4600 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4601 // This is a C++ constructor declaration. 4602 assert(DC->isRecord() && 4603 "Constructors can only be declared in a member context"); 4604 4605 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4606 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4607 D.getSourceRange().getBegin(), NameInfo, 4608 R, TInfo, isExplicit, isInline, 4609 /*isImplicitlyDeclared=*/false, 4610 isConstexpr); 4611 4612 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4613 // This is a C++ destructor declaration. 4614 if (DC->isRecord()) { 4615 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4616 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4617 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4618 SemaRef.Context, Record, 4619 D.getSourceRange().getBegin(), 4620 NameInfo, R, TInfo, isInline, 4621 /*isImplicitlyDeclared=*/false); 4622 4623 // If the class is complete, then we now create the implicit exception 4624 // specification. If the class is incomplete or dependent, we can't do 4625 // it yet. 4626 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4627 Record->getDefinition() && !Record->isBeingDefined() && 4628 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4629 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4630 } 4631 4632 IsVirtualOkay = true; 4633 return NewDD; 4634 4635 } else { 4636 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4637 D.setInvalidType(); 4638 4639 // Create a FunctionDecl to satisfy the function definition parsing 4640 // code path. 4641 return FunctionDecl::Create(SemaRef.Context, DC, 4642 D.getSourceRange().getBegin(), 4643 D.getIdentifierLoc(), Name, R, TInfo, 4644 SC, SCAsWritten, isInline, 4645 /*hasPrototype=*/true, isConstexpr); 4646 } 4647 4648 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4649 if (!DC->isRecord()) { 4650 SemaRef.Diag(D.getIdentifierLoc(), 4651 diag::err_conv_function_not_member); 4652 return 0; 4653 } 4654 4655 SemaRef.CheckConversionDeclarator(D, R, SC); 4656 IsVirtualOkay = true; 4657 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4658 D.getSourceRange().getBegin(), NameInfo, 4659 R, TInfo, isInline, isExplicit, 4660 isConstexpr, SourceLocation()); 4661 4662 } else if (DC->isRecord()) { 4663 // If the name of the function is the same as the name of the record, 4664 // then this must be an invalid constructor that has a return type. 4665 // (The parser checks for a return type and makes the declarator a 4666 // constructor if it has no return type). 4667 if (Name.getAsIdentifierInfo() && 4668 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4669 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4670 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4671 << SourceRange(D.getIdentifierLoc()); 4672 return 0; 4673 } 4674 4675 bool isStatic = SC == SC_Static; 4676 4677 // [class.free]p1: 4678 // Any allocation function for a class T is a static member 4679 // (even if not explicitly declared static). 4680 if (Name.getCXXOverloadedOperator() == OO_New || 4681 Name.getCXXOverloadedOperator() == OO_Array_New) 4682 isStatic = true; 4683 4684 // [class.free]p6 Any deallocation function for a class X is a static member 4685 // (even if not explicitly declared static). 4686 if (Name.getCXXOverloadedOperator() == OO_Delete || 4687 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4688 isStatic = true; 4689 4690 IsVirtualOkay = !isStatic; 4691 4692 // This is a C++ method declaration. 4693 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4694 D.getSourceRange().getBegin(), NameInfo, R, 4695 TInfo, isStatic, SCAsWritten, isInline, 4696 isConstexpr, SourceLocation()); 4697 4698 } else { 4699 // Determine whether the function was written with a 4700 // prototype. This true when: 4701 // - we're in C++ (where every function has a prototype), 4702 return FunctionDecl::Create(SemaRef.Context, DC, 4703 D.getSourceRange().getBegin(), 4704 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4705 true/*HasPrototype*/, isConstexpr); 4706 } 4707} 4708 4709NamedDecl* 4710Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4711 TypeSourceInfo *TInfo, LookupResult &Previous, 4712 MultiTemplateParamsArg TemplateParamLists, 4713 bool &AddToScope) { 4714 QualType R = TInfo->getType(); 4715 4716 assert(R.getTypePtr()->isFunctionType()); 4717 4718 // TODO: consider using NameInfo for diagnostic. 4719 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4720 DeclarationName Name = NameInfo.getName(); 4721 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4722 4723 if (D.getDeclSpec().isThreadSpecified()) 4724 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4725 4726 // Do not allow returning a objc interface by-value. 4727 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4728 Diag(D.getIdentifierLoc(), 4729 diag::err_object_cannot_be_passed_returned_by_value) << 0 4730 << R->getAs<FunctionType>()->getResultType() 4731 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4732 4733 QualType T = R->getAs<FunctionType>()->getResultType(); 4734 T = Context.getObjCObjectPointerType(T); 4735 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4736 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4737 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4738 FPT->getNumArgs(), EPI); 4739 } 4740 else if (isa<FunctionNoProtoType>(R)) 4741 R = Context.getFunctionNoProtoType(T); 4742 } 4743 4744 bool isFriend = false; 4745 FunctionTemplateDecl *FunctionTemplate = 0; 4746 bool isExplicitSpecialization = false; 4747 bool isFunctionTemplateSpecialization = false; 4748 bool isDependentClassScopeExplicitSpecialization = false; 4749 bool isVirtualOkay = false; 4750 4751 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4752 isVirtualOkay); 4753 if (!NewFD) return 0; 4754 4755 if (getLangOptions().CPlusPlus) { 4756 bool isInline = D.getDeclSpec().isInlineSpecified(); 4757 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4758 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4759 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4760 isFriend = D.getDeclSpec().isFriendSpecified(); 4761 if (isFriend && !isInline && D.isFunctionDefinition()) { 4762 // C++ [class.friend]p5 4763 // A function can be defined in a friend declaration of a 4764 // class . . . . Such a function is implicitly inline. 4765 NewFD->setImplicitlyInline(); 4766 } 4767 4768 SetNestedNameSpecifier(NewFD, D); 4769 isExplicitSpecialization = false; 4770 isFunctionTemplateSpecialization = false; 4771 if (D.isInvalidType()) 4772 NewFD->setInvalidDecl(); 4773 4774 // Set the lexical context. If the declarator has a C++ 4775 // scope specifier, or is the object of a friend declaration, the 4776 // lexical context will be different from the semantic context. 4777 NewFD->setLexicalDeclContext(CurContext); 4778 4779 // Match up the template parameter lists with the scope specifier, then 4780 // determine whether we have a template or a template specialization. 4781 bool Invalid = false; 4782 if (TemplateParameterList *TemplateParams 4783 = MatchTemplateParametersToScopeSpecifier( 4784 D.getDeclSpec().getSourceRange().getBegin(), 4785 D.getIdentifierLoc(), 4786 D.getCXXScopeSpec(), 4787 TemplateParamLists.get(), 4788 TemplateParamLists.size(), 4789 isFriend, 4790 isExplicitSpecialization, 4791 Invalid)) { 4792 if (TemplateParams->size() > 0) { 4793 // This is a function template 4794 4795 // Check that we can declare a template here. 4796 if (CheckTemplateDeclScope(S, TemplateParams)) 4797 return 0; 4798 4799 // A destructor cannot be a template. 4800 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4801 Diag(NewFD->getLocation(), diag::err_destructor_template); 4802 return 0; 4803 } 4804 4805 // If we're adding a template to a dependent context, we may need to 4806 // rebuilding some of the types used within the template parameter list, 4807 // now that we know what the current instantiation is. 4808 if (DC->isDependentContext()) { 4809 ContextRAII SavedContext(*this, DC); 4810 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4811 Invalid = true; 4812 } 4813 4814 4815 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4816 NewFD->getLocation(), 4817 Name, TemplateParams, 4818 NewFD); 4819 FunctionTemplate->setLexicalDeclContext(CurContext); 4820 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4821 4822 // For source fidelity, store the other template param lists. 4823 if (TemplateParamLists.size() > 1) { 4824 NewFD->setTemplateParameterListsInfo(Context, 4825 TemplateParamLists.size() - 1, 4826 TemplateParamLists.release()); 4827 } 4828 } else { 4829 // This is a function template specialization. 4830 isFunctionTemplateSpecialization = true; 4831 // For source fidelity, store all the template param lists. 4832 NewFD->setTemplateParameterListsInfo(Context, 4833 TemplateParamLists.size(), 4834 TemplateParamLists.release()); 4835 4836 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4837 if (isFriend) { 4838 // We want to remove the "template<>", found here. 4839 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4840 4841 // If we remove the template<> and the name is not a 4842 // template-id, we're actually silently creating a problem: 4843 // the friend declaration will refer to an untemplated decl, 4844 // and clearly the user wants a template specialization. So 4845 // we need to insert '<>' after the name. 4846 SourceLocation InsertLoc; 4847 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4848 InsertLoc = D.getName().getSourceRange().getEnd(); 4849 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4850 } 4851 4852 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4853 << Name << RemoveRange 4854 << FixItHint::CreateRemoval(RemoveRange) 4855 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4856 } 4857 } 4858 } 4859 else { 4860 // All template param lists were matched against the scope specifier: 4861 // this is NOT (an explicit specialization of) a template. 4862 if (TemplateParamLists.size() > 0) 4863 // For source fidelity, store all the template param lists. 4864 NewFD->setTemplateParameterListsInfo(Context, 4865 TemplateParamLists.size(), 4866 TemplateParamLists.release()); 4867 } 4868 4869 if (Invalid) { 4870 NewFD->setInvalidDecl(); 4871 if (FunctionTemplate) 4872 FunctionTemplate->setInvalidDecl(); 4873 } 4874 4875 // C++ [dcl.fct.spec]p5: 4876 // The virtual specifier shall only be used in declarations of 4877 // nonstatic class member functions that appear within a 4878 // member-specification of a class declaration; see 10.3. 4879 // 4880 if (isVirtual && !NewFD->isInvalidDecl()) { 4881 if (!isVirtualOkay) { 4882 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4883 diag::err_virtual_non_function); 4884 } else if (!CurContext->isRecord()) { 4885 // 'virtual' was specified outside of the class. 4886 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4887 diag::err_virtual_out_of_class) 4888 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4889 } else if (NewFD->getDescribedFunctionTemplate()) { 4890 // C++ [temp.mem]p3: 4891 // A member function template shall not be virtual. 4892 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4893 diag::err_virtual_member_function_template) 4894 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4895 } else { 4896 // Okay: Add virtual to the method. 4897 NewFD->setVirtualAsWritten(true); 4898 } 4899 } 4900 4901 // C++ [dcl.fct.spec]p3: 4902 // The inline specifier shall not appear on a block scope function declaration. 4903 if (isInline && !NewFD->isInvalidDecl()) { 4904 if (CurContext->isFunctionOrMethod()) { 4905 // 'inline' is not allowed on block scope function declaration. 4906 Diag(D.getDeclSpec().getInlineSpecLoc(), 4907 diag::err_inline_declaration_block_scope) << Name 4908 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4909 } 4910 } 4911 4912 // C++ [dcl.fct.spec]p6: 4913 // The explicit specifier shall be used only in the declaration of a 4914 // constructor or conversion function within its class definition; see 12.3.1 4915 // and 12.3.2. 4916 if (isExplicit && !NewFD->isInvalidDecl()) { 4917 if (!CurContext->isRecord()) { 4918 // 'explicit' was specified outside of the class. 4919 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4920 diag::err_explicit_out_of_class) 4921 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4922 } else if (!isa<CXXConstructorDecl>(NewFD) && 4923 !isa<CXXConversionDecl>(NewFD)) { 4924 // 'explicit' was specified on a function that wasn't a constructor 4925 // or conversion function. 4926 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4927 diag::err_explicit_non_ctor_or_conv_function) 4928 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4929 } 4930 } 4931 4932 if (isConstexpr) { 4933 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4934 // are implicitly inline. 4935 NewFD->setImplicitlyInline(); 4936 4937 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4938 // be either constructors or to return a literal type. Therefore, 4939 // destructors cannot be declared constexpr. 4940 if (isa<CXXDestructorDecl>(NewFD)) 4941 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4942 } 4943 4944 // If __module_private__ was specified, mark the function accordingly. 4945 if (D.getDeclSpec().isModulePrivateSpecified()) { 4946 if (isFunctionTemplateSpecialization) { 4947 SourceLocation ModulePrivateLoc 4948 = D.getDeclSpec().getModulePrivateSpecLoc(); 4949 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4950 << 0 4951 << FixItHint::CreateRemoval(ModulePrivateLoc); 4952 } else { 4953 NewFD->setModulePrivate(); 4954 if (FunctionTemplate) 4955 FunctionTemplate->setModulePrivate(); 4956 } 4957 } 4958 4959 if (isFriend) { 4960 // For now, claim that the objects have no previous declaration. 4961 if (FunctionTemplate) { 4962 FunctionTemplate->setObjectOfFriendDecl(false); 4963 FunctionTemplate->setAccess(AS_public); 4964 } 4965 NewFD->setObjectOfFriendDecl(false); 4966 NewFD->setAccess(AS_public); 4967 } 4968 4969 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4970 D.isFunctionDefinition()) { 4971 // A method is implicitly inline if it's defined in its class 4972 // definition. 4973 NewFD->setImplicitlyInline(); 4974 } 4975 4976 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4977 !CurContext->isRecord()) { 4978 // C++ [class.static]p1: 4979 // A data or function member of a class may be declared static 4980 // in a class definition, in which case it is a static member of 4981 // the class. 4982 4983 // Complain about the 'static' specifier if it's on an out-of-line 4984 // member function definition. 4985 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4986 diag::err_static_out_of_line) 4987 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4988 } 4989 } 4990 4991 // Filter out previous declarations that don't match the scope. 4992 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4993 isExplicitSpecialization || 4994 isFunctionTemplateSpecialization); 4995 4996 // Handle GNU asm-label extension (encoded as an attribute). 4997 if (Expr *E = (Expr*) D.getAsmLabel()) { 4998 // The parser guarantees this is a string. 4999 StringLiteral *SE = cast<StringLiteral>(E); 5000 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5001 SE->getString())); 5002 } 5003 5004 // Copy the parameter declarations from the declarator D to the function 5005 // declaration NewFD, if they are available. First scavenge them into Params. 5006 SmallVector<ParmVarDecl*, 16> Params; 5007 if (D.isFunctionDeclarator()) { 5008 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5009 5010 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5011 // function that takes no arguments, not a function that takes a 5012 // single void argument. 5013 // We let through "const void" here because Sema::GetTypeForDeclarator 5014 // already checks for that case. 5015 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5016 FTI.ArgInfo[0].Param && 5017 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5018 // Empty arg list, don't push any params. 5019 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5020 5021 // In C++, the empty parameter-type-list must be spelled "void"; a 5022 // typedef of void is not permitted. 5023 if (getLangOptions().CPlusPlus && 5024 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5025 bool IsTypeAlias = false; 5026 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5027 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5028 else if (const TemplateSpecializationType *TST = 5029 Param->getType()->getAs<TemplateSpecializationType>()) 5030 IsTypeAlias = TST->isTypeAlias(); 5031 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5032 << IsTypeAlias; 5033 } 5034 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5035 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5036 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5037 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5038 Param->setDeclContext(NewFD); 5039 Params.push_back(Param); 5040 5041 if (Param->isInvalidDecl()) 5042 NewFD->setInvalidDecl(); 5043 } 5044 } 5045 5046 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5047 // When we're declaring a function with a typedef, typeof, etc as in the 5048 // following example, we'll need to synthesize (unnamed) 5049 // parameters for use in the declaration. 5050 // 5051 // @code 5052 // typedef void fn(int); 5053 // fn f; 5054 // @endcode 5055 5056 // Synthesize a parameter for each argument type. 5057 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5058 AE = FT->arg_type_end(); AI != AE; ++AI) { 5059 ParmVarDecl *Param = 5060 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5061 Param->setScopeInfo(0, Params.size()); 5062 Params.push_back(Param); 5063 } 5064 } else { 5065 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5066 "Should not need args for typedef of non-prototype fn"); 5067 } 5068 // Finally, we know we have the right number of parameters, install them. 5069 NewFD->setParams(Params); 5070 5071 // Process the non-inheritable attributes on this declaration. 5072 ProcessDeclAttributes(S, NewFD, D, 5073 /*NonInheritable=*/true, /*Inheritable=*/false); 5074 5075 if (!getLangOptions().CPlusPlus) { 5076 // Perform semantic checking on the function declaration. 5077 bool isExplicitSpecialization=false; 5078 if (!NewFD->isInvalidDecl()) { 5079 if (NewFD->getResultType()->isVariablyModifiedType()) { 5080 // Functions returning a variably modified type violate C99 6.7.5.2p2 5081 // because all functions have linkage. 5082 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5083 NewFD->setInvalidDecl(); 5084 } else { 5085 if (NewFD->isMain()) 5086 CheckMain(NewFD, D.getDeclSpec()); 5087 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5088 isExplicitSpecialization)); 5089 } 5090 } 5091 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5092 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5093 "previous declaration set still overloaded"); 5094 } else { 5095 // If the declarator is a template-id, translate the parser's template 5096 // argument list into our AST format. 5097 bool HasExplicitTemplateArgs = false; 5098 TemplateArgumentListInfo TemplateArgs; 5099 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5100 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5101 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5102 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5103 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5104 TemplateId->getTemplateArgs(), 5105 TemplateId->NumArgs); 5106 translateTemplateArguments(TemplateArgsPtr, 5107 TemplateArgs); 5108 TemplateArgsPtr.release(); 5109 5110 HasExplicitTemplateArgs = true; 5111 5112 if (NewFD->isInvalidDecl()) { 5113 HasExplicitTemplateArgs = false; 5114 } else if (FunctionTemplate) { 5115 // Function template with explicit template arguments. 5116 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5117 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5118 5119 HasExplicitTemplateArgs = false; 5120 } else if (!isFunctionTemplateSpecialization && 5121 !D.getDeclSpec().isFriendSpecified()) { 5122 // We have encountered something that the user meant to be a 5123 // specialization (because it has explicitly-specified template 5124 // arguments) but that was not introduced with a "template<>" (or had 5125 // too few of them). 5126 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5127 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5128 << FixItHint::CreateInsertion( 5129 D.getDeclSpec().getSourceRange().getBegin(), 5130 "template<> "); 5131 isFunctionTemplateSpecialization = true; 5132 } else { 5133 // "friend void foo<>(int);" is an implicit specialization decl. 5134 isFunctionTemplateSpecialization = true; 5135 } 5136 } else if (isFriend && isFunctionTemplateSpecialization) { 5137 // This combination is only possible in a recovery case; the user 5138 // wrote something like: 5139 // template <> friend void foo(int); 5140 // which we're recovering from as if the user had written: 5141 // friend void foo<>(int); 5142 // Go ahead and fake up a template id. 5143 HasExplicitTemplateArgs = true; 5144 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5145 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5146 } 5147 5148 // If it's a friend (and only if it's a friend), it's possible 5149 // that either the specialized function type or the specialized 5150 // template is dependent, and therefore matching will fail. In 5151 // this case, don't check the specialization yet. 5152 bool InstantiationDependent = false; 5153 if (isFunctionTemplateSpecialization && isFriend && 5154 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5155 TemplateSpecializationType::anyDependentTemplateArguments( 5156 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5157 InstantiationDependent))) { 5158 assert(HasExplicitTemplateArgs && 5159 "friend function specialization without template args"); 5160 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5161 Previous)) 5162 NewFD->setInvalidDecl(); 5163 } else if (isFunctionTemplateSpecialization) { 5164 if (CurContext->isDependentContext() && CurContext->isRecord() 5165 && !isFriend) { 5166 isDependentClassScopeExplicitSpecialization = true; 5167 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5168 diag::ext_function_specialization_in_class : 5169 diag::err_function_specialization_in_class) 5170 << NewFD->getDeclName(); 5171 } else if (CheckFunctionTemplateSpecialization(NewFD, 5172 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5173 Previous)) 5174 NewFD->setInvalidDecl(); 5175 5176 // C++ [dcl.stc]p1: 5177 // A storage-class-specifier shall not be specified in an explicit 5178 // specialization (14.7.3) 5179 if (SC != SC_None) { 5180 if (SC != NewFD->getStorageClass()) 5181 Diag(NewFD->getLocation(), 5182 diag::err_explicit_specialization_inconsistent_storage_class) 5183 << SC 5184 << FixItHint::CreateRemoval( 5185 D.getDeclSpec().getStorageClassSpecLoc()); 5186 5187 else 5188 Diag(NewFD->getLocation(), 5189 diag::ext_explicit_specialization_storage_class) 5190 << FixItHint::CreateRemoval( 5191 D.getDeclSpec().getStorageClassSpecLoc()); 5192 } 5193 5194 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5195 if (CheckMemberSpecialization(NewFD, Previous)) 5196 NewFD->setInvalidDecl(); 5197 } 5198 5199 // Perform semantic checking on the function declaration. 5200 if (!isDependentClassScopeExplicitSpecialization) { 5201 if (NewFD->isInvalidDecl()) { 5202 // If this is a class member, mark the class invalid immediately. 5203 // This avoids some consistency errors later. 5204 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5205 methodDecl->getParent()->setInvalidDecl(); 5206 } else { 5207 if (NewFD->isMain()) 5208 CheckMain(NewFD, D.getDeclSpec()); 5209 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5210 isExplicitSpecialization)); 5211 } 5212 } 5213 5214 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5215 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5216 "previous declaration set still overloaded"); 5217 5218 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5219 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5220 NewFD->setInvalidDecl(); 5221 5222 NamedDecl *PrincipalDecl = (FunctionTemplate 5223 ? cast<NamedDecl>(FunctionTemplate) 5224 : NewFD); 5225 5226 if (isFriend && D.isRedeclaration()) { 5227 AccessSpecifier Access = AS_public; 5228 if (!NewFD->isInvalidDecl()) 5229 Access = NewFD->getPreviousDeclaration()->getAccess(); 5230 5231 NewFD->setAccess(Access); 5232 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5233 5234 PrincipalDecl->setObjectOfFriendDecl(true); 5235 } 5236 5237 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5238 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5239 PrincipalDecl->setNonMemberOperator(); 5240 5241 // If we have a function template, check the template parameter 5242 // list. This will check and merge default template arguments. 5243 if (FunctionTemplate) { 5244 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5245 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5246 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5247 D.getDeclSpec().isFriendSpecified() 5248 ? (D.isFunctionDefinition() 5249 ? TPC_FriendFunctionTemplateDefinition 5250 : TPC_FriendFunctionTemplate) 5251 : (D.getCXXScopeSpec().isSet() && 5252 DC && DC->isRecord() && 5253 DC->isDependentContext()) 5254 ? TPC_ClassTemplateMember 5255 : TPC_FunctionTemplate); 5256 } 5257 5258 if (NewFD->isInvalidDecl()) { 5259 // Ignore all the rest of this. 5260 } else if (!D.isRedeclaration()) { 5261 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5262 AddToScope }; 5263 // Fake up an access specifier if it's supposed to be a class member. 5264 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5265 NewFD->setAccess(AS_public); 5266 5267 // Qualified decls generally require a previous declaration. 5268 if (D.getCXXScopeSpec().isSet()) { 5269 // ...with the major exception of templated-scope or 5270 // dependent-scope friend declarations. 5271 5272 // TODO: we currently also suppress this check in dependent 5273 // contexts because (1) the parameter depth will be off when 5274 // matching friend templates and (2) we might actually be 5275 // selecting a friend based on a dependent factor. But there 5276 // are situations where these conditions don't apply and we 5277 // can actually do this check immediately. 5278 if (isFriend && 5279 (TemplateParamLists.size() || 5280 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5281 CurContext->isDependentContext())) { 5282 // ignore these 5283 } else { 5284 // The user tried to provide an out-of-line definition for a 5285 // function that is a member of a class or namespace, but there 5286 // was no such member function declared (C++ [class.mfct]p2, 5287 // C++ [namespace.memdef]p2). For example: 5288 // 5289 // class X { 5290 // void f() const; 5291 // }; 5292 // 5293 // void X::f() { } // ill-formed 5294 // 5295 // Complain about this problem, and attempt to suggest close 5296 // matches (e.g., those that differ only in cv-qualifiers and 5297 // whether the parameter types are references). 5298 5299 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5300 NewFD, 5301 ExtraArgs)) { 5302 AddToScope = ExtraArgs.AddToScope; 5303 return Result; 5304 } 5305 } 5306 5307 // Unqualified local friend declarations are required to resolve 5308 // to something. 5309 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5310 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5311 NewFD, 5312 ExtraArgs)) { 5313 AddToScope = ExtraArgs.AddToScope; 5314 return Result; 5315 } 5316 } 5317 5318 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5319 !isFriend && !isFunctionTemplateSpecialization && 5320 !isExplicitSpecialization) { 5321 // An out-of-line member function declaration must also be a 5322 // definition (C++ [dcl.meaning]p1). 5323 // Note that this is not the case for explicit specializations of 5324 // function templates or member functions of class templates, per 5325 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5326 // for compatibility with old SWIG code which likes to generate them. 5327 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5328 << D.getCXXScopeSpec().getRange(); 5329 } 5330 } 5331 5332 5333 // Handle attributes. We need to have merged decls when handling attributes 5334 // (for example to check for conflicts, etc). 5335 // FIXME: This needs to happen before we merge declarations. Then, 5336 // let attribute merging cope with attribute conflicts. 5337 ProcessDeclAttributes(S, NewFD, D, 5338 /*NonInheritable=*/false, /*Inheritable=*/true); 5339 5340 // attributes declared post-definition are currently ignored 5341 // FIXME: This should happen during attribute merging 5342 if (D.isRedeclaration() && Previous.isSingleResult()) { 5343 const FunctionDecl *Def; 5344 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5345 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5346 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5347 Diag(Def->getLocation(), diag::note_previous_definition); 5348 } 5349 } 5350 5351 AddKnownFunctionAttributes(NewFD); 5352 5353 if (NewFD->hasAttr<OverloadableAttr>() && 5354 !NewFD->getType()->getAs<FunctionProtoType>()) { 5355 Diag(NewFD->getLocation(), 5356 diag::err_attribute_overloadable_no_prototype) 5357 << NewFD; 5358 5359 // Turn this into a variadic function with no parameters. 5360 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5361 FunctionProtoType::ExtProtoInfo EPI; 5362 EPI.Variadic = true; 5363 EPI.ExtInfo = FT->getExtInfo(); 5364 5365 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5366 NewFD->setType(R); 5367 } 5368 5369 // If there's a #pragma GCC visibility in scope, and this isn't a class 5370 // member, set the visibility of this function. 5371 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5372 AddPushedVisibilityAttribute(NewFD); 5373 5374 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5375 // marking the function. 5376 AddCFAuditedAttribute(NewFD); 5377 5378 // If this is a locally-scoped extern C function, update the 5379 // map of such names. 5380 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5381 && !NewFD->isInvalidDecl()) 5382 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5383 5384 // Set this FunctionDecl's range up to the right paren. 5385 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5386 5387 if (getLangOptions().CPlusPlus) { 5388 if (FunctionTemplate) { 5389 if (NewFD->isInvalidDecl()) 5390 FunctionTemplate->setInvalidDecl(); 5391 return FunctionTemplate; 5392 } 5393 } 5394 5395 MarkUnusedFileScopedDecl(NewFD); 5396 5397 if (getLangOptions().CUDA) 5398 if (IdentifierInfo *II = NewFD->getIdentifier()) 5399 if (!NewFD->isInvalidDecl() && 5400 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5401 if (II->isStr("cudaConfigureCall")) { 5402 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5403 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5404 5405 Context.setcudaConfigureCallDecl(NewFD); 5406 } 5407 } 5408 5409 // Here we have an function template explicit specialization at class scope. 5410 // The actually specialization will be postponed to template instatiation 5411 // time via the ClassScopeFunctionSpecializationDecl node. 5412 if (isDependentClassScopeExplicitSpecialization) { 5413 ClassScopeFunctionSpecializationDecl *NewSpec = 5414 ClassScopeFunctionSpecializationDecl::Create( 5415 Context, CurContext, SourceLocation(), 5416 cast<CXXMethodDecl>(NewFD)); 5417 CurContext->addDecl(NewSpec); 5418 AddToScope = false; 5419 } 5420 5421 return NewFD; 5422} 5423 5424/// \brief Perform semantic checking of a new function declaration. 5425/// 5426/// Performs semantic analysis of the new function declaration 5427/// NewFD. This routine performs all semantic checking that does not 5428/// require the actual declarator involved in the declaration, and is 5429/// used both for the declaration of functions as they are parsed 5430/// (called via ActOnDeclarator) and for the declaration of functions 5431/// that have been instantiated via C++ template instantiation (called 5432/// via InstantiateDecl). 5433/// 5434/// \param IsExplicitSpecialiation whether this new function declaration is 5435/// an explicit specialization of the previous declaration. 5436/// 5437/// This sets NewFD->isInvalidDecl() to true if there was an error. 5438/// 5439/// Returns true if the function declaration is a redeclaration. 5440bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5441 LookupResult &Previous, 5442 bool IsExplicitSpecialization) { 5443 assert(!NewFD->getResultType()->isVariablyModifiedType() 5444 && "Variably modified return types are not handled here"); 5445 5446 // Check for a previous declaration of this name. 5447 if (Previous.empty() && NewFD->isExternC()) { 5448 // Since we did not find anything by this name and we're declaring 5449 // an extern "C" function, look for a non-visible extern "C" 5450 // declaration with the same name. 5451 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5452 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5453 if (Pos != LocallyScopedExternalDecls.end()) 5454 Previous.addDecl(Pos->second); 5455 } 5456 5457 bool Redeclaration = false; 5458 5459 // Merge or overload the declaration with an existing declaration of 5460 // the same name, if appropriate. 5461 if (!Previous.empty()) { 5462 // Determine whether NewFD is an overload of PrevDecl or 5463 // a declaration that requires merging. If it's an overload, 5464 // there's no more work to do here; we'll just add the new 5465 // function to the scope. 5466 5467 NamedDecl *OldDecl = 0; 5468 if (!AllowOverloadingOfFunction(Previous, Context)) { 5469 Redeclaration = true; 5470 OldDecl = Previous.getFoundDecl(); 5471 } else { 5472 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5473 /*NewIsUsingDecl*/ false)) { 5474 case Ovl_Match: 5475 Redeclaration = true; 5476 break; 5477 5478 case Ovl_NonFunction: 5479 Redeclaration = true; 5480 break; 5481 5482 case Ovl_Overload: 5483 Redeclaration = false; 5484 break; 5485 } 5486 5487 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5488 // If a function name is overloadable in C, then every function 5489 // with that name must be marked "overloadable". 5490 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5491 << Redeclaration << NewFD; 5492 NamedDecl *OverloadedDecl = 0; 5493 if (Redeclaration) 5494 OverloadedDecl = OldDecl; 5495 else if (!Previous.empty()) 5496 OverloadedDecl = Previous.getRepresentativeDecl(); 5497 if (OverloadedDecl) 5498 Diag(OverloadedDecl->getLocation(), 5499 diag::note_attribute_overloadable_prev_overload); 5500 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5501 Context)); 5502 } 5503 } 5504 5505 if (Redeclaration) { 5506 // NewFD and OldDecl represent declarations that need to be 5507 // merged. 5508 if (MergeFunctionDecl(NewFD, OldDecl)) { 5509 NewFD->setInvalidDecl(); 5510 return Redeclaration; 5511 } 5512 5513 Previous.clear(); 5514 Previous.addDecl(OldDecl); 5515 5516 if (FunctionTemplateDecl *OldTemplateDecl 5517 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5518 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5519 FunctionTemplateDecl *NewTemplateDecl 5520 = NewFD->getDescribedFunctionTemplate(); 5521 assert(NewTemplateDecl && "Template/non-template mismatch"); 5522 if (CXXMethodDecl *Method 5523 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5524 Method->setAccess(OldTemplateDecl->getAccess()); 5525 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5526 } 5527 5528 // If this is an explicit specialization of a member that is a function 5529 // template, mark it as a member specialization. 5530 if (IsExplicitSpecialization && 5531 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5532 NewTemplateDecl->setMemberSpecialization(); 5533 assert(OldTemplateDecl->isMemberSpecialization()); 5534 } 5535 5536 if (OldTemplateDecl->isModulePrivate()) 5537 NewTemplateDecl->setModulePrivate(); 5538 5539 } else { 5540 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5541 NewFD->setAccess(OldDecl->getAccess()); 5542 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5543 } 5544 } 5545 } 5546 5547 // Semantic checking for this function declaration (in isolation). 5548 if (getLangOptions().CPlusPlus) { 5549 // C++-specific checks. 5550 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5551 CheckConstructor(Constructor); 5552 } else if (CXXDestructorDecl *Destructor = 5553 dyn_cast<CXXDestructorDecl>(NewFD)) { 5554 CXXRecordDecl *Record = Destructor->getParent(); 5555 QualType ClassType = Context.getTypeDeclType(Record); 5556 5557 // FIXME: Shouldn't we be able to perform this check even when the class 5558 // type is dependent? Both gcc and edg can handle that. 5559 if (!ClassType->isDependentType()) { 5560 DeclarationName Name 5561 = Context.DeclarationNames.getCXXDestructorName( 5562 Context.getCanonicalType(ClassType)); 5563 if (NewFD->getDeclName() != Name) { 5564 Diag(NewFD->getLocation(), diag::err_destructor_name); 5565 NewFD->setInvalidDecl(); 5566 return Redeclaration; 5567 } 5568 } 5569 } else if (CXXConversionDecl *Conversion 5570 = dyn_cast<CXXConversionDecl>(NewFD)) { 5571 ActOnConversionDeclarator(Conversion); 5572 } 5573 5574 // Find any virtual functions that this function overrides. 5575 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5576 if (!Method->isFunctionTemplateSpecialization() && 5577 !Method->getDescribedFunctionTemplate()) { 5578 if (AddOverriddenMethods(Method->getParent(), Method)) { 5579 // If the function was marked as "static", we have a problem. 5580 if (NewFD->getStorageClass() == SC_Static) { 5581 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5582 << NewFD->getDeclName(); 5583 for (CXXMethodDecl::method_iterator 5584 Overridden = Method->begin_overridden_methods(), 5585 OverriddenEnd = Method->end_overridden_methods(); 5586 Overridden != OverriddenEnd; 5587 ++Overridden) { 5588 Diag((*Overridden)->getLocation(), 5589 diag::note_overridden_virtual_function); 5590 } 5591 } 5592 } 5593 } 5594 } 5595 5596 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5597 if (NewFD->isOverloadedOperator() && 5598 CheckOverloadedOperatorDeclaration(NewFD)) { 5599 NewFD->setInvalidDecl(); 5600 return Redeclaration; 5601 } 5602 5603 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5604 if (NewFD->getLiteralIdentifier() && 5605 CheckLiteralOperatorDeclaration(NewFD)) { 5606 NewFD->setInvalidDecl(); 5607 return Redeclaration; 5608 } 5609 5610 // In C++, check default arguments now that we have merged decls. Unless 5611 // the lexical context is the class, because in this case this is done 5612 // during delayed parsing anyway. 5613 if (!CurContext->isRecord()) 5614 CheckCXXDefaultArguments(NewFD); 5615 5616 // If this function declares a builtin function, check the type of this 5617 // declaration against the expected type for the builtin. 5618 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5619 ASTContext::GetBuiltinTypeError Error; 5620 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5621 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5622 // The type of this function differs from the type of the builtin, 5623 // so forget about the builtin entirely. 5624 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5625 } 5626 } 5627 } 5628 return Redeclaration; 5629} 5630 5631void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5632 // C++ [basic.start.main]p3: A program that declares main to be inline 5633 // or static is ill-formed. 5634 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5635 // shall not appear in a declaration of main. 5636 // static main is not an error under C99, but we should warn about it. 5637 if (FD->getStorageClass() == SC_Static) 5638 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5639 ? diag::err_static_main : diag::warn_static_main) 5640 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5641 if (FD->isInlineSpecified()) 5642 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5643 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5644 5645 QualType T = FD->getType(); 5646 assert(T->isFunctionType() && "function decl is not of function type"); 5647 const FunctionType* FT = T->getAs<FunctionType>(); 5648 5649 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5650 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5651 FD->setInvalidDecl(true); 5652 } 5653 5654 // Treat protoless main() as nullary. 5655 if (isa<FunctionNoProtoType>(FT)) return; 5656 5657 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5658 unsigned nparams = FTP->getNumArgs(); 5659 assert(FD->getNumParams() == nparams); 5660 5661 bool HasExtraParameters = (nparams > 3); 5662 5663 // Darwin passes an undocumented fourth argument of type char**. If 5664 // other platforms start sprouting these, the logic below will start 5665 // getting shifty. 5666 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5667 HasExtraParameters = false; 5668 5669 if (HasExtraParameters) { 5670 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5671 FD->setInvalidDecl(true); 5672 nparams = 3; 5673 } 5674 5675 // FIXME: a lot of the following diagnostics would be improved 5676 // if we had some location information about types. 5677 5678 QualType CharPP = 5679 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5680 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5681 5682 for (unsigned i = 0; i < nparams; ++i) { 5683 QualType AT = FTP->getArgType(i); 5684 5685 bool mismatch = true; 5686 5687 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5688 mismatch = false; 5689 else if (Expected[i] == CharPP) { 5690 // As an extension, the following forms are okay: 5691 // char const ** 5692 // char const * const * 5693 // char * const * 5694 5695 QualifierCollector qs; 5696 const PointerType* PT; 5697 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5698 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5699 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5700 qs.removeConst(); 5701 mismatch = !qs.empty(); 5702 } 5703 } 5704 5705 if (mismatch) { 5706 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5707 // TODO: suggest replacing given type with expected type 5708 FD->setInvalidDecl(true); 5709 } 5710 } 5711 5712 if (nparams == 1 && !FD->isInvalidDecl()) { 5713 Diag(FD->getLocation(), diag::warn_main_one_arg); 5714 } 5715 5716 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5717 Diag(FD->getLocation(), diag::err_main_template_decl); 5718 FD->setInvalidDecl(); 5719 } 5720} 5721 5722bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5723 // FIXME: Need strict checking. In C89, we need to check for 5724 // any assignment, increment, decrement, function-calls, or 5725 // commas outside of a sizeof. In C99, it's the same list, 5726 // except that the aforementioned are allowed in unevaluated 5727 // expressions. Everything else falls under the 5728 // "may accept other forms of constant expressions" exception. 5729 // (We never end up here for C++, so the constant expression 5730 // rules there don't matter.) 5731 if (Init->isConstantInitializer(Context, false)) 5732 return false; 5733 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5734 << Init->getSourceRange(); 5735 return true; 5736} 5737 5738namespace { 5739 // Visits an initialization expression to see if OrigDecl is evaluated in 5740 // its own initialization and throws a warning if it does. 5741 class SelfReferenceChecker 5742 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5743 Sema &S; 5744 Decl *OrigDecl; 5745 bool isRecordType; 5746 bool isPODType; 5747 5748 public: 5749 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5750 5751 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5752 S(S), OrigDecl(OrigDecl) { 5753 isPODType = false; 5754 isRecordType = false; 5755 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5756 isPODType = VD->getType().isPODType(S.Context); 5757 isRecordType = VD->getType()->isRecordType(); 5758 } 5759 } 5760 5761 void VisitExpr(Expr *E) { 5762 if (isa<ObjCMessageExpr>(*E)) return; 5763 if (isRecordType) { 5764 Expr *expr = E; 5765 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5766 ValueDecl *VD = ME->getMemberDecl(); 5767 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5768 expr = ME->getBase(); 5769 } 5770 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5771 HandleDeclRefExpr(DRE); 5772 return; 5773 } 5774 } 5775 Inherited::VisitExpr(E); 5776 } 5777 5778 void VisitMemberExpr(MemberExpr *E) { 5779 if (E->getType()->canDecayToPointerType()) return; 5780 if (isa<FieldDecl>(E->getMemberDecl())) 5781 if (DeclRefExpr *DRE 5782 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5783 HandleDeclRefExpr(DRE); 5784 return; 5785 } 5786 Inherited::VisitMemberExpr(E); 5787 } 5788 5789 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5790 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5791 (isRecordType && E->getCastKind() == CK_NoOp)) { 5792 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5793 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5794 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5795 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5796 HandleDeclRefExpr(DRE); 5797 return; 5798 } 5799 } 5800 Inherited::VisitImplicitCastExpr(E); 5801 } 5802 5803 void VisitUnaryOperator(UnaryOperator *E) { 5804 // For POD record types, addresses of its own members are well-defined. 5805 if (isRecordType && isPODType) return; 5806 Inherited::VisitUnaryOperator(E); 5807 } 5808 5809 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5810 Decl* ReferenceDecl = DRE->getDecl(); 5811 if (OrigDecl != ReferenceDecl) return; 5812 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5813 Sema::NotForRedeclaration); 5814 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5815 S.PDiag(diag::warn_uninit_self_reference_in_init) 5816 << Result.getLookupName() 5817 << OrigDecl->getLocation() 5818 << DRE->getSourceRange()); 5819 } 5820 }; 5821} 5822 5823/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5824void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5825 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5826} 5827 5828/// AddInitializerToDecl - Adds the initializer Init to the 5829/// declaration dcl. If DirectInit is true, this is C++ direct 5830/// initialization rather than copy initialization. 5831void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5832 bool DirectInit, bool TypeMayContainAuto) { 5833 // If there is no declaration, there was an error parsing it. Just ignore 5834 // the initializer. 5835 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5836 return; 5837 5838 // Check for self-references within variable initializers. 5839 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5840 // Variables declared within a function/method body are handled 5841 // by a dataflow analysis. 5842 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5843 CheckSelfReference(RealDecl, Init); 5844 } 5845 else { 5846 CheckSelfReference(RealDecl, Init); 5847 } 5848 5849 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5850 // With declarators parsed the way they are, the parser cannot 5851 // distinguish between a normal initializer and a pure-specifier. 5852 // Thus this grotesque test. 5853 IntegerLiteral *IL; 5854 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5855 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5856 CheckPureMethod(Method, Init->getSourceRange()); 5857 else { 5858 Diag(Method->getLocation(), diag::err_member_function_initialization) 5859 << Method->getDeclName() << Init->getSourceRange(); 5860 Method->setInvalidDecl(); 5861 } 5862 return; 5863 } 5864 5865 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5866 if (!VDecl) { 5867 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5868 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5869 RealDecl->setInvalidDecl(); 5870 return; 5871 } 5872 5873 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5874 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5875 TypeSourceInfo *DeducedType = 0; 5876 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5877 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5878 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5879 << Init->getSourceRange(); 5880 if (!DeducedType) { 5881 RealDecl->setInvalidDecl(); 5882 return; 5883 } 5884 VDecl->setTypeSourceInfo(DeducedType); 5885 VDecl->setType(DeducedType->getType()); 5886 5887 // In ARC, infer lifetime. 5888 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5889 VDecl->setInvalidDecl(); 5890 5891 // If this is a redeclaration, check that the type we just deduced matches 5892 // the previously declared type. 5893 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5894 MergeVarDeclTypes(VDecl, Old); 5895 } 5896 5897 5898 // A definition must end up with a complete type, which means it must be 5899 // complete with the restriction that an array type might be completed by the 5900 // initializer; note that later code assumes this restriction. 5901 QualType BaseDeclType = VDecl->getType(); 5902 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5903 BaseDeclType = Array->getElementType(); 5904 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5905 diag::err_typecheck_decl_incomplete_type)) { 5906 RealDecl->setInvalidDecl(); 5907 return; 5908 } 5909 5910 // The variable can not have an abstract class type. 5911 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5912 diag::err_abstract_type_in_decl, 5913 AbstractVariableType)) 5914 VDecl->setInvalidDecl(); 5915 5916 const VarDecl *Def; 5917 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5918 Diag(VDecl->getLocation(), diag::err_redefinition) 5919 << VDecl->getDeclName(); 5920 Diag(Def->getLocation(), diag::note_previous_definition); 5921 VDecl->setInvalidDecl(); 5922 return; 5923 } 5924 5925 const VarDecl* PrevInit = 0; 5926 if (getLangOptions().CPlusPlus) { 5927 // C++ [class.static.data]p4 5928 // If a static data member is of const integral or const 5929 // enumeration type, its declaration in the class definition can 5930 // specify a constant-initializer which shall be an integral 5931 // constant expression (5.19). In that case, the member can appear 5932 // in integral constant expressions. The member shall still be 5933 // defined in a namespace scope if it is used in the program and the 5934 // namespace scope definition shall not contain an initializer. 5935 // 5936 // We already performed a redefinition check above, but for static 5937 // data members we also need to check whether there was an in-class 5938 // declaration with an initializer. 5939 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5940 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5941 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5942 return; 5943 } 5944 5945 if (VDecl->hasLocalStorage()) 5946 getCurFunction()->setHasBranchProtectedScope(); 5947 5948 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5949 VDecl->setInvalidDecl(); 5950 return; 5951 } 5952 } 5953 5954 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5955 // a kernel function cannot be initialized." 5956 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5957 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5958 VDecl->setInvalidDecl(); 5959 return; 5960 } 5961 5962 // Capture the variable that is being initialized and the style of 5963 // initialization. 5964 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5965 5966 // FIXME: Poor source location information. 5967 InitializationKind Kind 5968 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5969 Init->getLocStart(), 5970 Init->getLocEnd()) 5971 : InitializationKind::CreateCopy(VDecl->getLocation(), 5972 Init->getLocStart()); 5973 5974 // Get the decls type and save a reference for later, since 5975 // CheckInitializerTypes may change it. 5976 QualType DclT = VDecl->getType(), SavT = DclT; 5977 if (VDecl->isLocalVarDecl()) { 5978 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5979 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5980 VDecl->setInvalidDecl(); 5981 } else if (!VDecl->isInvalidDecl()) { 5982 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5983 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5984 MultiExprArg(*this, &Init, 1), 5985 &DclT); 5986 if (Result.isInvalid()) { 5987 VDecl->setInvalidDecl(); 5988 return; 5989 } 5990 5991 Init = Result.takeAs<Expr>(); 5992 5993 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5994 // Don't check invalid declarations to avoid emitting useless diagnostics. 5995 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5996 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5997 CheckForConstantInitializer(Init, DclT); 5998 } 5999 } 6000 } else if (VDecl->isStaticDataMember() && 6001 VDecl->getLexicalDeclContext()->isRecord()) { 6002 // This is an in-class initialization for a static data member, e.g., 6003 // 6004 // struct S { 6005 // static const int value = 17; 6006 // }; 6007 6008 // Try to perform the initialization regardless. 6009 if (!VDecl->isInvalidDecl()) { 6010 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6011 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6012 MultiExprArg(*this, &Init, 1), 6013 &DclT); 6014 if (Result.isInvalid()) { 6015 VDecl->setInvalidDecl(); 6016 return; 6017 } 6018 6019 Init = Result.takeAs<Expr>(); 6020 } 6021 6022 // C++ [class.mem]p4: 6023 // A member-declarator can contain a constant-initializer only 6024 // if it declares a static member (9.4) of const integral or 6025 // const enumeration type, see 9.4.2. 6026 // 6027 // C++0x [class.static.data]p3: 6028 // If a non-volatile const static data member is of integral or 6029 // enumeration type, its declaration in the class definition can 6030 // specify a brace-or-equal-initializer in which every initalizer-clause 6031 // that is an assignment-expression is a constant expression. A static 6032 // data member of literal type can be declared in the class definition 6033 // with the constexpr specifier; if so, its declaration shall specify a 6034 // brace-or-equal-initializer in which every initializer-clause that is 6035 // an assignment-expression is a constant expression. 6036 QualType T = VDecl->getType(); 6037 6038 // Do nothing on dependent types. 6039 if (T->isDependentType()) { 6040 6041 // Allow any 'static constexpr' members, whether or not they are of literal 6042 // type. We separately check that the initializer is a constant expression, 6043 // which implicitly requires the member to be of literal type. 6044 } else if (VDecl->isConstexpr()) { 6045 6046 // Require constness. 6047 } else if (!T.isConstQualified()) { 6048 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6049 << Init->getSourceRange(); 6050 VDecl->setInvalidDecl(); 6051 6052 // We allow integer constant expressions in all cases. 6053 } else if (T->isIntegralOrEnumerationType()) { 6054 // Check whether the expression is a constant expression. 6055 SourceLocation Loc; 6056 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6057 // In C++0x, a non-constexpr const static data member with an 6058 // in-class initializer cannot be volatile. 6059 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6060 else if (Init->isValueDependent()) 6061 ; // Nothing to check. 6062 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6063 ; // Ok, it's an ICE! 6064 else if (Init->isEvaluatable(Context)) { 6065 // If we can constant fold the initializer through heroics, accept it, 6066 // but report this as a use of an extension for -pedantic. 6067 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6068 << Init->getSourceRange(); 6069 } else { 6070 // Otherwise, this is some crazy unknown case. Report the issue at the 6071 // location provided by the isIntegerConstantExpr failed check. 6072 Diag(Loc, diag::err_in_class_initializer_non_constant) 6073 << Init->getSourceRange(); 6074 VDecl->setInvalidDecl(); 6075 } 6076 6077 // We allow floating-point constants as an extension. 6078 } else if (T->isFloatingType()) { // also permits complex, which is ok 6079 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6080 << T << Init->getSourceRange(); 6081 if (getLangOptions().CPlusPlus0x) 6082 Diag(VDecl->getLocation(), 6083 diag::note_in_class_initializer_float_type_constexpr) 6084 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6085 6086 if (!Init->isValueDependent() && 6087 !Init->isConstantInitializer(Context, false)) { 6088 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6089 << Init->getSourceRange(); 6090 VDecl->setInvalidDecl(); 6091 } 6092 6093 // Suggest adding 'constexpr' in C++0x for literal types. 6094 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6095 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6096 << T << Init->getSourceRange() 6097 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6098 VDecl->setConstexpr(true); 6099 6100 } else { 6101 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6102 << T << Init->getSourceRange(); 6103 VDecl->setInvalidDecl(); 6104 } 6105 } else if (VDecl->isFileVarDecl()) { 6106 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6107 (!getLangOptions().CPlusPlus || 6108 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6109 Diag(VDecl->getLocation(), diag::warn_extern_init); 6110 if (!VDecl->isInvalidDecl()) { 6111 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6112 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6113 MultiExprArg(*this, &Init, 1), 6114 &DclT); 6115 if (Result.isInvalid()) { 6116 VDecl->setInvalidDecl(); 6117 return; 6118 } 6119 6120 Init = Result.takeAs<Expr>(); 6121 } 6122 6123 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6124 // Don't check invalid declarations to avoid emitting useless diagnostics. 6125 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6126 // C99 6.7.8p4. All file scoped initializers need to be constant. 6127 CheckForConstantInitializer(Init, DclT); 6128 } 6129 } 6130 // If the type changed, it means we had an incomplete type that was 6131 // completed by the initializer. For example: 6132 // int ary[] = { 1, 3, 5 }; 6133 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6134 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6135 VDecl->setType(DclT); 6136 Init->setType(DclT); 6137 } 6138 6139 // Check any implicit conversions within the expression. 6140 CheckImplicitConversions(Init, VDecl->getLocation()); 6141 6142 if (!VDecl->isInvalidDecl()) 6143 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6144 6145 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6146 !VDecl->getType()->isDependentType() && 6147 !Init->isTypeDependent() && !Init->isValueDependent() && 6148 !Init->isConstantInitializer(Context, 6149 VDecl->getType()->isReferenceType())) { 6150 // FIXME: Improve this diagnostic to explain why the initializer is not 6151 // a constant expression. 6152 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6153 << VDecl << Init->getSourceRange(); 6154 } 6155 6156 Init = MaybeCreateExprWithCleanups(Init); 6157 // Attach the initializer to the decl. 6158 VDecl->setInit(Init); 6159 6160 CheckCompleteVariableDeclaration(VDecl); 6161} 6162 6163/// ActOnInitializerError - Given that there was an error parsing an 6164/// initializer for the given declaration, try to return to some form 6165/// of sanity. 6166void Sema::ActOnInitializerError(Decl *D) { 6167 // Our main concern here is re-establishing invariants like "a 6168 // variable's type is either dependent or complete". 6169 if (!D || D->isInvalidDecl()) return; 6170 6171 VarDecl *VD = dyn_cast<VarDecl>(D); 6172 if (!VD) return; 6173 6174 // Auto types are meaningless if we can't make sense of the initializer. 6175 if (ParsingInitForAutoVars.count(D)) { 6176 D->setInvalidDecl(); 6177 return; 6178 } 6179 6180 QualType Ty = VD->getType(); 6181 if (Ty->isDependentType()) return; 6182 6183 // Require a complete type. 6184 if (RequireCompleteType(VD->getLocation(), 6185 Context.getBaseElementType(Ty), 6186 diag::err_typecheck_decl_incomplete_type)) { 6187 VD->setInvalidDecl(); 6188 return; 6189 } 6190 6191 // Require an abstract type. 6192 if (RequireNonAbstractType(VD->getLocation(), Ty, 6193 diag::err_abstract_type_in_decl, 6194 AbstractVariableType)) { 6195 VD->setInvalidDecl(); 6196 return; 6197 } 6198 6199 // Don't bother complaining about constructors or destructors, 6200 // though. 6201} 6202 6203void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6204 bool TypeMayContainAuto) { 6205 // If there is no declaration, there was an error parsing it. Just ignore it. 6206 if (RealDecl == 0) 6207 return; 6208 6209 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6210 QualType Type = Var->getType(); 6211 6212 // C++0x [dcl.spec.auto]p3 6213 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6214 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6215 << Var->getDeclName() << Type; 6216 Var->setInvalidDecl(); 6217 return; 6218 } 6219 6220 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6221 // have an initializer. 6222 // C++0x [class.static.data]p3: A static data member can be declared with 6223 // the constexpr specifier; if so, its declaration shall specify 6224 // a brace-or-equal-initializer. 6225 // 6226 // A static data member's definition may inherit an initializer from an 6227 // in-class declaration. 6228 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6229 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6230 << Var->getDeclName(); 6231 Var->setInvalidDecl(); 6232 return; 6233 } 6234 6235 switch (Var->isThisDeclarationADefinition()) { 6236 case VarDecl::Definition: 6237 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6238 break; 6239 6240 // We have an out-of-line definition of a static data member 6241 // that has an in-class initializer, so we type-check this like 6242 // a declaration. 6243 // 6244 // Fall through 6245 6246 case VarDecl::DeclarationOnly: 6247 // It's only a declaration. 6248 6249 // Block scope. C99 6.7p7: If an identifier for an object is 6250 // declared with no linkage (C99 6.2.2p6), the type for the 6251 // object shall be complete. 6252 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6253 !Var->getLinkage() && !Var->isInvalidDecl() && 6254 RequireCompleteType(Var->getLocation(), Type, 6255 diag::err_typecheck_decl_incomplete_type)) 6256 Var->setInvalidDecl(); 6257 6258 // Make sure that the type is not abstract. 6259 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6260 RequireNonAbstractType(Var->getLocation(), Type, 6261 diag::err_abstract_type_in_decl, 6262 AbstractVariableType)) 6263 Var->setInvalidDecl(); 6264 return; 6265 6266 case VarDecl::TentativeDefinition: 6267 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6268 // object that has file scope without an initializer, and without a 6269 // storage-class specifier or with the storage-class specifier "static", 6270 // constitutes a tentative definition. Note: A tentative definition with 6271 // external linkage is valid (C99 6.2.2p5). 6272 if (!Var->isInvalidDecl()) { 6273 if (const IncompleteArrayType *ArrayT 6274 = Context.getAsIncompleteArrayType(Type)) { 6275 if (RequireCompleteType(Var->getLocation(), 6276 ArrayT->getElementType(), 6277 diag::err_illegal_decl_array_incomplete_type)) 6278 Var->setInvalidDecl(); 6279 } else if (Var->getStorageClass() == SC_Static) { 6280 // C99 6.9.2p3: If the declaration of an identifier for an object is 6281 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6282 // declared type shall not be an incomplete type. 6283 // NOTE: code such as the following 6284 // static struct s; 6285 // struct s { int a; }; 6286 // is accepted by gcc. Hence here we issue a warning instead of 6287 // an error and we do not invalidate the static declaration. 6288 // NOTE: to avoid multiple warnings, only check the first declaration. 6289 if (Var->getPreviousDeclaration() == 0) 6290 RequireCompleteType(Var->getLocation(), Type, 6291 diag::ext_typecheck_decl_incomplete_type); 6292 } 6293 } 6294 6295 // Record the tentative definition; we're done. 6296 if (!Var->isInvalidDecl()) 6297 TentativeDefinitions.push_back(Var); 6298 return; 6299 } 6300 6301 // Provide a specific diagnostic for uninitialized variable 6302 // definitions with incomplete array type. 6303 if (Type->isIncompleteArrayType()) { 6304 Diag(Var->getLocation(), 6305 diag::err_typecheck_incomplete_array_needs_initializer); 6306 Var->setInvalidDecl(); 6307 return; 6308 } 6309 6310 // Provide a specific diagnostic for uninitialized variable 6311 // definitions with reference type. 6312 if (Type->isReferenceType()) { 6313 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6314 << Var->getDeclName() 6315 << SourceRange(Var->getLocation(), Var->getLocation()); 6316 Var->setInvalidDecl(); 6317 return; 6318 } 6319 6320 // Do not attempt to type-check the default initializer for a 6321 // variable with dependent type. 6322 if (Type->isDependentType()) 6323 return; 6324 6325 if (Var->isInvalidDecl()) 6326 return; 6327 6328 if (RequireCompleteType(Var->getLocation(), 6329 Context.getBaseElementType(Type), 6330 diag::err_typecheck_decl_incomplete_type)) { 6331 Var->setInvalidDecl(); 6332 return; 6333 } 6334 6335 // The variable can not have an abstract class type. 6336 if (RequireNonAbstractType(Var->getLocation(), Type, 6337 diag::err_abstract_type_in_decl, 6338 AbstractVariableType)) { 6339 Var->setInvalidDecl(); 6340 return; 6341 } 6342 6343 // Check for jumps past the implicit initializer. C++0x 6344 // clarifies that this applies to a "variable with automatic 6345 // storage duration", not a "local variable". 6346 // C++0x [stmt.dcl]p3 6347 // A program that jumps from a point where a variable with automatic 6348 // storage duration is not in scope to a point where it is in scope is 6349 // ill-formed unless the variable has scalar type, class type with a 6350 // trivial default constructor and a trivial destructor, a cv-qualified 6351 // version of one of these types, or an array of one of the preceding 6352 // types and is declared without an initializer. 6353 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6354 if (const RecordType *Record 6355 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6356 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6357 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6358 (getLangOptions().CPlusPlus0x && 6359 (!CXXRecord->hasTrivialDefaultConstructor() || 6360 !CXXRecord->hasTrivialDestructor()))) 6361 getCurFunction()->setHasBranchProtectedScope(); 6362 } 6363 } 6364 6365 // C++03 [dcl.init]p9: 6366 // If no initializer is specified for an object, and the 6367 // object is of (possibly cv-qualified) non-POD class type (or 6368 // array thereof), the object shall be default-initialized; if 6369 // the object is of const-qualified type, the underlying class 6370 // type shall have a user-declared default 6371 // constructor. Otherwise, if no initializer is specified for 6372 // a non- static object, the object and its subobjects, if 6373 // any, have an indeterminate initial value); if the object 6374 // or any of its subobjects are of const-qualified type, the 6375 // program is ill-formed. 6376 // C++0x [dcl.init]p11: 6377 // If no initializer is specified for an object, the object is 6378 // default-initialized; [...]. 6379 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6380 InitializationKind Kind 6381 = InitializationKind::CreateDefault(Var->getLocation()); 6382 6383 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6384 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6385 MultiExprArg(*this, 0, 0)); 6386 if (Init.isInvalid()) 6387 Var->setInvalidDecl(); 6388 else if (Init.get()) 6389 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6390 6391 CheckCompleteVariableDeclaration(Var); 6392 } 6393} 6394 6395void Sema::ActOnCXXForRangeDecl(Decl *D) { 6396 VarDecl *VD = dyn_cast<VarDecl>(D); 6397 if (!VD) { 6398 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6399 D->setInvalidDecl(); 6400 return; 6401 } 6402 6403 VD->setCXXForRangeDecl(true); 6404 6405 // for-range-declaration cannot be given a storage class specifier. 6406 int Error = -1; 6407 switch (VD->getStorageClassAsWritten()) { 6408 case SC_None: 6409 break; 6410 case SC_Extern: 6411 Error = 0; 6412 break; 6413 case SC_Static: 6414 Error = 1; 6415 break; 6416 case SC_PrivateExtern: 6417 Error = 2; 6418 break; 6419 case SC_Auto: 6420 Error = 3; 6421 break; 6422 case SC_Register: 6423 Error = 4; 6424 break; 6425 case SC_OpenCLWorkGroupLocal: 6426 llvm_unreachable("Unexpected storage class"); 6427 } 6428 if (VD->isConstexpr()) 6429 Error = 5; 6430 if (Error != -1) { 6431 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6432 << VD->getDeclName() << Error; 6433 D->setInvalidDecl(); 6434 } 6435} 6436 6437void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6438 if (var->isInvalidDecl()) return; 6439 6440 // In ARC, don't allow jumps past the implicit initialization of a 6441 // local retaining variable. 6442 if (getLangOptions().ObjCAutoRefCount && 6443 var->hasLocalStorage()) { 6444 switch (var->getType().getObjCLifetime()) { 6445 case Qualifiers::OCL_None: 6446 case Qualifiers::OCL_ExplicitNone: 6447 case Qualifiers::OCL_Autoreleasing: 6448 break; 6449 6450 case Qualifiers::OCL_Weak: 6451 case Qualifiers::OCL_Strong: 6452 getCurFunction()->setHasBranchProtectedScope(); 6453 break; 6454 } 6455 } 6456 6457 // All the following checks are C++ only. 6458 if (!getLangOptions().CPlusPlus) return; 6459 6460 QualType baseType = Context.getBaseElementType(var->getType()); 6461 if (baseType->isDependentType()) return; 6462 6463 // __block variables might require us to capture a copy-initializer. 6464 if (var->hasAttr<BlocksAttr>()) { 6465 // It's currently invalid to ever have a __block variable with an 6466 // array type; should we diagnose that here? 6467 6468 // Regardless, we don't want to ignore array nesting when 6469 // constructing this copy. 6470 QualType type = var->getType(); 6471 6472 if (type->isStructureOrClassType()) { 6473 SourceLocation poi = var->getLocation(); 6474 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6475 ExprResult result = 6476 PerformCopyInitialization( 6477 InitializedEntity::InitializeBlock(poi, type, false), 6478 poi, Owned(varRef)); 6479 if (!result.isInvalid()) { 6480 result = MaybeCreateExprWithCleanups(result); 6481 Expr *init = result.takeAs<Expr>(); 6482 Context.setBlockVarCopyInits(var, init); 6483 } 6484 } 6485 } 6486 6487 // Check for global constructors. 6488 if (!var->getDeclContext()->isDependentContext() && 6489 var->hasGlobalStorage() && 6490 !var->isStaticLocal() && 6491 var->getInit() && 6492 !var->getInit()->isConstantInitializer(Context, 6493 baseType->isReferenceType())) 6494 Diag(var->getLocation(), diag::warn_global_constructor) 6495 << var->getInit()->getSourceRange(); 6496 6497 // Require the destructor. 6498 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6499 FinalizeVarWithDestructor(var, recordType); 6500} 6501 6502/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6503/// any semantic actions necessary after any initializer has been attached. 6504void 6505Sema::FinalizeDeclaration(Decl *ThisDecl) { 6506 // Note that we are no longer parsing the initializer for this declaration. 6507 ParsingInitForAutoVars.erase(ThisDecl); 6508} 6509 6510Sema::DeclGroupPtrTy 6511Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6512 Decl **Group, unsigned NumDecls) { 6513 SmallVector<Decl*, 8> Decls; 6514 6515 if (DS.isTypeSpecOwned()) 6516 Decls.push_back(DS.getRepAsDecl()); 6517 6518 for (unsigned i = 0; i != NumDecls; ++i) 6519 if (Decl *D = Group[i]) 6520 Decls.push_back(D); 6521 6522 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6523 DS.getTypeSpecType() == DeclSpec::TST_auto); 6524} 6525 6526/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6527/// group, performing any necessary semantic checking. 6528Sema::DeclGroupPtrTy 6529Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6530 bool TypeMayContainAuto) { 6531 // C++0x [dcl.spec.auto]p7: 6532 // If the type deduced for the template parameter U is not the same in each 6533 // deduction, the program is ill-formed. 6534 // FIXME: When initializer-list support is added, a distinction is needed 6535 // between the deduced type U and the deduced type which 'auto' stands for. 6536 // auto a = 0, b = { 1, 2, 3 }; 6537 // is legal because the deduced type U is 'int' in both cases. 6538 if (TypeMayContainAuto && NumDecls > 1) { 6539 QualType Deduced; 6540 CanQualType DeducedCanon; 6541 VarDecl *DeducedDecl = 0; 6542 for (unsigned i = 0; i != NumDecls; ++i) { 6543 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6544 AutoType *AT = D->getType()->getContainedAutoType(); 6545 // Don't reissue diagnostics when instantiating a template. 6546 if (AT && D->isInvalidDecl()) 6547 break; 6548 if (AT && AT->isDeduced()) { 6549 QualType U = AT->getDeducedType(); 6550 CanQualType UCanon = Context.getCanonicalType(U); 6551 if (Deduced.isNull()) { 6552 Deduced = U; 6553 DeducedCanon = UCanon; 6554 DeducedDecl = D; 6555 } else if (DeducedCanon != UCanon) { 6556 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6557 diag::err_auto_different_deductions) 6558 << Deduced << DeducedDecl->getDeclName() 6559 << U << D->getDeclName() 6560 << DeducedDecl->getInit()->getSourceRange() 6561 << D->getInit()->getSourceRange(); 6562 D->setInvalidDecl(); 6563 break; 6564 } 6565 } 6566 } 6567 } 6568 } 6569 6570 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6571} 6572 6573 6574/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6575/// to introduce parameters into function prototype scope. 6576Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6577 const DeclSpec &DS = D.getDeclSpec(); 6578 6579 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6580 VarDecl::StorageClass StorageClass = SC_None; 6581 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6582 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6583 StorageClass = SC_Register; 6584 StorageClassAsWritten = SC_Register; 6585 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6586 Diag(DS.getStorageClassSpecLoc(), 6587 diag::err_invalid_storage_class_in_func_decl); 6588 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6589 } 6590 6591 if (D.getDeclSpec().isThreadSpecified()) 6592 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6593 if (D.getDeclSpec().isConstexprSpecified()) 6594 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6595 << 0; 6596 6597 DiagnoseFunctionSpecifiers(D); 6598 6599 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6600 QualType parmDeclType = TInfo->getType(); 6601 6602 if (getLangOptions().CPlusPlus) { 6603 // Check that there are no default arguments inside the type of this 6604 // parameter. 6605 CheckExtraCXXDefaultArguments(D); 6606 6607 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6608 if (D.getCXXScopeSpec().isSet()) { 6609 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6610 << D.getCXXScopeSpec().getRange(); 6611 D.getCXXScopeSpec().clear(); 6612 } 6613 } 6614 6615 // Ensure we have a valid name 6616 IdentifierInfo *II = 0; 6617 if (D.hasName()) { 6618 II = D.getIdentifier(); 6619 if (!II) { 6620 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6621 << GetNameForDeclarator(D).getName().getAsString(); 6622 D.setInvalidType(true); 6623 } 6624 } 6625 6626 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6627 if (II) { 6628 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6629 ForRedeclaration); 6630 LookupName(R, S); 6631 if (R.isSingleResult()) { 6632 NamedDecl *PrevDecl = R.getFoundDecl(); 6633 if (PrevDecl->isTemplateParameter()) { 6634 // Maybe we will complain about the shadowed template parameter. 6635 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6636 // Just pretend that we didn't see the previous declaration. 6637 PrevDecl = 0; 6638 } else if (S->isDeclScope(PrevDecl)) { 6639 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6640 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6641 6642 // Recover by removing the name 6643 II = 0; 6644 D.SetIdentifier(0, D.getIdentifierLoc()); 6645 D.setInvalidType(true); 6646 } 6647 } 6648 } 6649 6650 // Temporarily put parameter variables in the translation unit, not 6651 // the enclosing context. This prevents them from accidentally 6652 // looking like class members in C++. 6653 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6654 D.getSourceRange().getBegin(), 6655 D.getIdentifierLoc(), II, 6656 parmDeclType, TInfo, 6657 StorageClass, StorageClassAsWritten); 6658 6659 if (D.isInvalidType()) 6660 New->setInvalidDecl(); 6661 6662 assert(S->isFunctionPrototypeScope()); 6663 assert(S->getFunctionPrototypeDepth() >= 1); 6664 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6665 S->getNextFunctionPrototypeIndex()); 6666 6667 // Add the parameter declaration into this scope. 6668 S->AddDecl(New); 6669 if (II) 6670 IdResolver.AddDecl(New); 6671 6672 ProcessDeclAttributes(S, New, D); 6673 6674 if (D.getDeclSpec().isModulePrivateSpecified()) 6675 Diag(New->getLocation(), diag::err_module_private_local) 6676 << 1 << New->getDeclName() 6677 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6678 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6679 6680 if (New->hasAttr<BlocksAttr>()) { 6681 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6682 } 6683 return New; 6684} 6685 6686/// \brief Synthesizes a variable for a parameter arising from a 6687/// typedef. 6688ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6689 SourceLocation Loc, 6690 QualType T) { 6691 /* FIXME: setting StartLoc == Loc. 6692 Would it be worth to modify callers so as to provide proper source 6693 location for the unnamed parameters, embedding the parameter's type? */ 6694 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6695 T, Context.getTrivialTypeSourceInfo(T, Loc), 6696 SC_None, SC_None, 0); 6697 Param->setImplicit(); 6698 return Param; 6699} 6700 6701void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6702 ParmVarDecl * const *ParamEnd) { 6703 // Don't diagnose unused-parameter errors in template instantiations; we 6704 // will already have done so in the template itself. 6705 if (!ActiveTemplateInstantiations.empty()) 6706 return; 6707 6708 for (; Param != ParamEnd; ++Param) { 6709 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6710 !(*Param)->hasAttr<UnusedAttr>()) { 6711 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6712 << (*Param)->getDeclName(); 6713 } 6714 } 6715} 6716 6717void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6718 ParmVarDecl * const *ParamEnd, 6719 QualType ReturnTy, 6720 NamedDecl *D) { 6721 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6722 return; 6723 6724 // Warn if the return value is pass-by-value and larger than the specified 6725 // threshold. 6726 if (ReturnTy.isPODType(Context)) { 6727 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6728 if (Size > LangOpts.NumLargeByValueCopy) 6729 Diag(D->getLocation(), diag::warn_return_value_size) 6730 << D->getDeclName() << Size; 6731 } 6732 6733 // Warn if any parameter is pass-by-value and larger than the specified 6734 // threshold. 6735 for (; Param != ParamEnd; ++Param) { 6736 QualType T = (*Param)->getType(); 6737 if (!T.isPODType(Context)) 6738 continue; 6739 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6740 if (Size > LangOpts.NumLargeByValueCopy) 6741 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6742 << (*Param)->getDeclName() << Size; 6743 } 6744} 6745 6746ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6747 SourceLocation NameLoc, IdentifierInfo *Name, 6748 QualType T, TypeSourceInfo *TSInfo, 6749 VarDecl::StorageClass StorageClass, 6750 VarDecl::StorageClass StorageClassAsWritten) { 6751 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6752 if (getLangOptions().ObjCAutoRefCount && 6753 T.getObjCLifetime() == Qualifiers::OCL_None && 6754 T->isObjCLifetimeType()) { 6755 6756 Qualifiers::ObjCLifetime lifetime; 6757 6758 // Special cases for arrays: 6759 // - if it's const, use __unsafe_unretained 6760 // - otherwise, it's an error 6761 if (T->isArrayType()) { 6762 if (!T.isConstQualified()) { 6763 DelayedDiagnostics.add( 6764 sema::DelayedDiagnostic::makeForbiddenType( 6765 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6766 } 6767 lifetime = Qualifiers::OCL_ExplicitNone; 6768 } else { 6769 lifetime = T->getObjCARCImplicitLifetime(); 6770 } 6771 T = Context.getLifetimeQualifiedType(T, lifetime); 6772 } 6773 6774 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6775 Context.getAdjustedParameterType(T), 6776 TSInfo, 6777 StorageClass, StorageClassAsWritten, 6778 0); 6779 6780 // Parameters can not be abstract class types. 6781 // For record types, this is done by the AbstractClassUsageDiagnoser once 6782 // the class has been completely parsed. 6783 if (!CurContext->isRecord() && 6784 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6785 AbstractParamType)) 6786 New->setInvalidDecl(); 6787 6788 // Parameter declarators cannot be interface types. All ObjC objects are 6789 // passed by reference. 6790 if (T->isObjCObjectType()) { 6791 Diag(NameLoc, 6792 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6793 << FixItHint::CreateInsertion(NameLoc, "*"); 6794 T = Context.getObjCObjectPointerType(T); 6795 New->setType(T); 6796 } 6797 6798 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6799 // duration shall not be qualified by an address-space qualifier." 6800 // Since all parameters have automatic store duration, they can not have 6801 // an address space. 6802 if (T.getAddressSpace() != 0) { 6803 Diag(NameLoc, diag::err_arg_with_address_space); 6804 New->setInvalidDecl(); 6805 } 6806 6807 return New; 6808} 6809 6810void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6811 SourceLocation LocAfterDecls) { 6812 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6813 6814 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6815 // for a K&R function. 6816 if (!FTI.hasPrototype) { 6817 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6818 --i; 6819 if (FTI.ArgInfo[i].Param == 0) { 6820 llvm::SmallString<256> Code; 6821 llvm::raw_svector_ostream(Code) << " int " 6822 << FTI.ArgInfo[i].Ident->getName() 6823 << ";\n"; 6824 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6825 << FTI.ArgInfo[i].Ident 6826 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6827 6828 // Implicitly declare the argument as type 'int' for lack of a better 6829 // type. 6830 AttributeFactory attrs; 6831 DeclSpec DS(attrs); 6832 const char* PrevSpec; // unused 6833 unsigned DiagID; // unused 6834 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6835 PrevSpec, DiagID); 6836 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6837 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6838 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6839 } 6840 } 6841 } 6842} 6843 6844Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6845 Declarator &D) { 6846 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6847 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6848 Scope *ParentScope = FnBodyScope->getParent(); 6849 6850 D.setFunctionDefinition(true); 6851 Decl *DP = HandleDeclarator(ParentScope, D, 6852 MultiTemplateParamsArg(*this)); 6853 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6854} 6855 6856static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6857 // Don't warn about invalid declarations. 6858 if (FD->isInvalidDecl()) 6859 return false; 6860 6861 // Or declarations that aren't global. 6862 if (!FD->isGlobal()) 6863 return false; 6864 6865 // Don't warn about C++ member functions. 6866 if (isa<CXXMethodDecl>(FD)) 6867 return false; 6868 6869 // Don't warn about 'main'. 6870 if (FD->isMain()) 6871 return false; 6872 6873 // Don't warn about inline functions. 6874 if (FD->isInlined()) 6875 return false; 6876 6877 // Don't warn about function templates. 6878 if (FD->getDescribedFunctionTemplate()) 6879 return false; 6880 6881 // Don't warn about function template specializations. 6882 if (FD->isFunctionTemplateSpecialization()) 6883 return false; 6884 6885 bool MissingPrototype = true; 6886 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6887 Prev; Prev = Prev->getPreviousDeclaration()) { 6888 // Ignore any declarations that occur in function or method 6889 // scope, because they aren't visible from the header. 6890 if (Prev->getDeclContext()->isFunctionOrMethod()) 6891 continue; 6892 6893 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6894 break; 6895 } 6896 6897 return MissingPrototype; 6898} 6899 6900void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6901 // Don't complain if we're in GNU89 mode and the previous definition 6902 // was an extern inline function. 6903 const FunctionDecl *Definition; 6904 if (FD->isDefined(Definition) && 6905 !canRedefineFunction(Definition, getLangOptions())) { 6906 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6907 Definition->getStorageClass() == SC_Extern) 6908 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6909 << FD->getDeclName() << getLangOptions().CPlusPlus; 6910 else 6911 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6912 Diag(Definition->getLocation(), diag::note_previous_definition); 6913 } 6914} 6915 6916Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6917 // Clear the last template instantiation error context. 6918 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6919 6920 if (!D) 6921 return D; 6922 FunctionDecl *FD = 0; 6923 6924 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6925 FD = FunTmpl->getTemplatedDecl(); 6926 else 6927 FD = cast<FunctionDecl>(D); 6928 6929 // Enter a new function scope 6930 PushFunctionScope(); 6931 6932 // See if this is a redefinition. 6933 if (!FD->isLateTemplateParsed()) 6934 CheckForFunctionRedefinition(FD); 6935 6936 // Builtin functions cannot be defined. 6937 if (unsigned BuiltinID = FD->getBuiltinID()) { 6938 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6939 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6940 FD->setInvalidDecl(); 6941 } 6942 } 6943 6944 // The return type of a function definition must be complete 6945 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6946 QualType ResultType = FD->getResultType(); 6947 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6948 !FD->isInvalidDecl() && 6949 RequireCompleteType(FD->getLocation(), ResultType, 6950 diag::err_func_def_incomplete_result)) 6951 FD->setInvalidDecl(); 6952 6953 // GNU warning -Wmissing-prototypes: 6954 // Warn if a global function is defined without a previous 6955 // prototype declaration. This warning is issued even if the 6956 // definition itself provides a prototype. The aim is to detect 6957 // global functions that fail to be declared in header files. 6958 if (ShouldWarnAboutMissingPrototype(FD)) 6959 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6960 6961 if (FnBodyScope) 6962 PushDeclContext(FnBodyScope, FD); 6963 6964 // Check the validity of our function parameters 6965 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6966 /*CheckParameterNames=*/true); 6967 6968 // Introduce our parameters into the function scope 6969 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6970 ParmVarDecl *Param = FD->getParamDecl(p); 6971 Param->setOwningFunction(FD); 6972 6973 // If this has an identifier, add it to the scope stack. 6974 if (Param->getIdentifier() && FnBodyScope) { 6975 CheckShadow(FnBodyScope, Param); 6976 6977 PushOnScopeChains(Param, FnBodyScope); 6978 } 6979 } 6980 6981 // Checking attributes of current function definition 6982 // dllimport attribute. 6983 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6984 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6985 // dllimport attribute cannot be directly applied to definition. 6986 // Microsoft accepts dllimport for functions defined within class scope. 6987 if (!DA->isInherited() && 6988 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6989 Diag(FD->getLocation(), 6990 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6991 << "dllimport"; 6992 FD->setInvalidDecl(); 6993 return FD; 6994 } 6995 6996 // Visual C++ appears to not think this is an issue, so only issue 6997 // a warning when Microsoft extensions are disabled. 6998 if (!LangOpts.MicrosoftExt) { 6999 // If a symbol previously declared dllimport is later defined, the 7000 // attribute is ignored in subsequent references, and a warning is 7001 // emitted. 7002 Diag(FD->getLocation(), 7003 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7004 << FD->getName() << "dllimport"; 7005 } 7006 } 7007 return FD; 7008} 7009 7010/// \brief Given the set of return statements within a function body, 7011/// compute the variables that are subject to the named return value 7012/// optimization. 7013/// 7014/// Each of the variables that is subject to the named return value 7015/// optimization will be marked as NRVO variables in the AST, and any 7016/// return statement that has a marked NRVO variable as its NRVO candidate can 7017/// use the named return value optimization. 7018/// 7019/// This function applies a very simplistic algorithm for NRVO: if every return 7020/// statement in the function has the same NRVO candidate, that candidate is 7021/// the NRVO variable. 7022/// 7023/// FIXME: Employ a smarter algorithm that accounts for multiple return 7024/// statements and the lifetimes of the NRVO candidates. We should be able to 7025/// find a maximal set of NRVO variables. 7026void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7027 ReturnStmt **Returns = Scope->Returns.data(); 7028 7029 const VarDecl *NRVOCandidate = 0; 7030 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7031 if (!Returns[I]->getNRVOCandidate()) 7032 return; 7033 7034 if (!NRVOCandidate) 7035 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7036 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7037 return; 7038 } 7039 7040 if (NRVOCandidate) 7041 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7042} 7043 7044Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7045 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7046} 7047 7048Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7049 bool IsInstantiation) { 7050 FunctionDecl *FD = 0; 7051 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7052 if (FunTmpl) 7053 FD = FunTmpl->getTemplatedDecl(); 7054 else 7055 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7056 7057 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7058 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7059 7060 if (FD) { 7061 FD->setBody(Body); 7062 if (FD->isMain()) { 7063 // C and C++ allow for main to automagically return 0. 7064 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7065 FD->setHasImplicitReturnZero(true); 7066 WP.disableCheckFallThrough(); 7067 } else if (FD->hasAttr<NakedAttr>()) { 7068 // If the function is marked 'naked', don't complain about missing return 7069 // statements. 7070 WP.disableCheckFallThrough(); 7071 } 7072 7073 // MSVC permits the use of pure specifier (=0) on function definition, 7074 // defined at class scope, warn about this non standard construct. 7075 if (getLangOptions().MicrosoftExt && FD->isPure()) 7076 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7077 7078 if (!FD->isInvalidDecl()) { 7079 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7080 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7081 FD->getResultType(), FD); 7082 7083 // If this is a constructor, we need a vtable. 7084 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7085 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7086 7087 computeNRVO(Body, getCurFunction()); 7088 } 7089 7090 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7091 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7092 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7093 MD->setBody(Body); 7094 if (Body) 7095 MD->setEndLoc(Body->getLocEnd()); 7096 if (!MD->isInvalidDecl()) { 7097 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7098 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7099 MD->getResultType(), MD); 7100 7101 if (Body) 7102 computeNRVO(Body, getCurFunction()); 7103 } 7104 if (ObjCShouldCallSuperDealloc) { 7105 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7106 ObjCShouldCallSuperDealloc = false; 7107 } 7108 if (ObjCShouldCallSuperFinalize) { 7109 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7110 ObjCShouldCallSuperFinalize = false; 7111 } 7112 } else { 7113 return 0; 7114 } 7115 7116 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7117 "ObjC methods, which should have been handled in the block above."); 7118 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7119 "ObjC methods, which should have been handled in the block above."); 7120 7121 // Verify and clean out per-function state. 7122 if (Body) { 7123 // C++ constructors that have function-try-blocks can't have return 7124 // statements in the handlers of that block. (C++ [except.handle]p14) 7125 // Verify this. 7126 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7127 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7128 7129 // Verify that gotos and switch cases don't jump into scopes illegally. 7130 if (getCurFunction()->NeedsScopeChecking() && 7131 !dcl->isInvalidDecl() && 7132 !hasAnyUnrecoverableErrorsInThisFunction()) 7133 DiagnoseInvalidJumps(Body); 7134 7135 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7136 if (!Destructor->getParent()->isDependentType()) 7137 CheckDestructor(Destructor); 7138 7139 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7140 Destructor->getParent()); 7141 } 7142 7143 // If any errors have occurred, clear out any temporaries that may have 7144 // been leftover. This ensures that these temporaries won't be picked up for 7145 // deletion in some later function. 7146 if (PP.getDiagnostics().hasErrorOccurred() || 7147 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7148 ExprTemporaries.clear(); 7149 ExprNeedsCleanups = false; 7150 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7151 // Since the body is valid, issue any analysis-based warnings that are 7152 // enabled. 7153 ActivePolicy = &WP; 7154 } 7155 7156 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7157 !CheckConstexprFunctionBody(FD, Body)) 7158 FD->setInvalidDecl(); 7159 7160 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7161 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7162 } 7163 7164 if (!IsInstantiation) 7165 PopDeclContext(); 7166 7167 PopFunctionOrBlockScope(ActivePolicy, dcl); 7168 7169 // If any errors have occurred, clear out any temporaries that may have 7170 // been leftover. This ensures that these temporaries won't be picked up for 7171 // deletion in some later function. 7172 if (getDiagnostics().hasErrorOccurred()) { 7173 ExprTemporaries.clear(); 7174 ExprNeedsCleanups = false; 7175 } 7176 7177 return dcl; 7178} 7179 7180 7181/// When we finish delayed parsing of an attribute, we must attach it to the 7182/// relevant Decl. 7183void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7184 ParsedAttributes &Attrs) { 7185 ProcessDeclAttributeList(S, D, Attrs.getList()); 7186} 7187 7188 7189/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7190/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7191NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7192 IdentifierInfo &II, Scope *S) { 7193 // Before we produce a declaration for an implicitly defined 7194 // function, see whether there was a locally-scoped declaration of 7195 // this name as a function or variable. If so, use that 7196 // (non-visible) declaration, and complain about it. 7197 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7198 = findLocallyScopedExternalDecl(&II); 7199 if (Pos != LocallyScopedExternalDecls.end()) { 7200 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7201 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7202 return Pos->second; 7203 } 7204 7205 // Extension in C99. Legal in C90, but warn about it. 7206 if (II.getName().startswith("__builtin_")) 7207 Diag(Loc, diag::warn_builtin_unknown) << &II; 7208 else if (getLangOptions().C99) 7209 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7210 else 7211 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7212 7213 // Set a Declarator for the implicit definition: int foo(); 7214 const char *Dummy; 7215 AttributeFactory attrFactory; 7216 DeclSpec DS(attrFactory); 7217 unsigned DiagID; 7218 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7219 (void)Error; // Silence warning. 7220 assert(!Error && "Error setting up implicit decl!"); 7221 Declarator D(DS, Declarator::BlockContext); 7222 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7223 0, 0, true, SourceLocation(), 7224 SourceLocation(), 7225 EST_None, SourceLocation(), 7226 0, 0, 0, 0, Loc, Loc, D), 7227 DS.getAttributes(), 7228 SourceLocation()); 7229 D.SetIdentifier(&II, Loc); 7230 7231 // Insert this function into translation-unit scope. 7232 7233 DeclContext *PrevDC = CurContext; 7234 CurContext = Context.getTranslationUnitDecl(); 7235 7236 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7237 FD->setImplicit(); 7238 7239 CurContext = PrevDC; 7240 7241 AddKnownFunctionAttributes(FD); 7242 7243 return FD; 7244} 7245 7246/// \brief Adds any function attributes that we know a priori based on 7247/// the declaration of this function. 7248/// 7249/// These attributes can apply both to implicitly-declared builtins 7250/// (like __builtin___printf_chk) or to library-declared functions 7251/// like NSLog or printf. 7252/// 7253/// We need to check for duplicate attributes both here and where user-written 7254/// attributes are applied to declarations. 7255void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7256 if (FD->isInvalidDecl()) 7257 return; 7258 7259 // If this is a built-in function, map its builtin attributes to 7260 // actual attributes. 7261 if (unsigned BuiltinID = FD->getBuiltinID()) { 7262 // Handle printf-formatting attributes. 7263 unsigned FormatIdx; 7264 bool HasVAListArg; 7265 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7266 if (!FD->getAttr<FormatAttr>()) 7267 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7268 "printf", FormatIdx+1, 7269 HasVAListArg ? 0 : FormatIdx+2)); 7270 } 7271 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7272 HasVAListArg)) { 7273 if (!FD->getAttr<FormatAttr>()) 7274 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7275 "scanf", FormatIdx+1, 7276 HasVAListArg ? 0 : FormatIdx+2)); 7277 } 7278 7279 // Mark const if we don't care about errno and that is the only 7280 // thing preventing the function from being const. This allows 7281 // IRgen to use LLVM intrinsics for such functions. 7282 if (!getLangOptions().MathErrno && 7283 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7284 if (!FD->getAttr<ConstAttr>()) 7285 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7286 } 7287 7288 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7289 !FD->getAttr<ReturnsTwiceAttr>()) 7290 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7291 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7292 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7293 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7294 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7295 } 7296 7297 IdentifierInfo *Name = FD->getIdentifier(); 7298 if (!Name) 7299 return; 7300 if ((!getLangOptions().CPlusPlus && 7301 FD->getDeclContext()->isTranslationUnit()) || 7302 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7303 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7304 LinkageSpecDecl::lang_c)) { 7305 // Okay: this could be a libc/libm/Objective-C function we know 7306 // about. 7307 } else 7308 return; 7309 7310 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7311 // FIXME: NSLog and NSLogv should be target specific 7312 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7313 // FIXME: We known better than our headers. 7314 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7315 } else 7316 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7317 "printf", 1, 7318 Name->isStr("NSLogv") ? 0 : 2)); 7319 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7320 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7321 // target-specific builtins, perhaps? 7322 if (!FD->getAttr<FormatAttr>()) 7323 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7324 "printf", 2, 7325 Name->isStr("vasprintf") ? 0 : 3)); 7326 } 7327} 7328 7329TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7330 TypeSourceInfo *TInfo) { 7331 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7332 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7333 7334 if (!TInfo) { 7335 assert(D.isInvalidType() && "no declarator info for valid type"); 7336 TInfo = Context.getTrivialTypeSourceInfo(T); 7337 } 7338 7339 // Scope manipulation handled by caller. 7340 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7341 D.getSourceRange().getBegin(), 7342 D.getIdentifierLoc(), 7343 D.getIdentifier(), 7344 TInfo); 7345 7346 // Bail out immediately if we have an invalid declaration. 7347 if (D.isInvalidType()) { 7348 NewTD->setInvalidDecl(); 7349 return NewTD; 7350 } 7351 7352 if (D.getDeclSpec().isModulePrivateSpecified()) { 7353 if (CurContext->isFunctionOrMethod()) 7354 Diag(NewTD->getLocation(), diag::err_module_private_local) 7355 << 2 << NewTD->getDeclName() 7356 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7357 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7358 else 7359 NewTD->setModulePrivate(); 7360 } 7361 7362 // C++ [dcl.typedef]p8: 7363 // If the typedef declaration defines an unnamed class (or 7364 // enum), the first typedef-name declared by the declaration 7365 // to be that class type (or enum type) is used to denote the 7366 // class type (or enum type) for linkage purposes only. 7367 // We need to check whether the type was declared in the declaration. 7368 switch (D.getDeclSpec().getTypeSpecType()) { 7369 case TST_enum: 7370 case TST_struct: 7371 case TST_union: 7372 case TST_class: { 7373 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7374 7375 // Do nothing if the tag is not anonymous or already has an 7376 // associated typedef (from an earlier typedef in this decl group). 7377 if (tagFromDeclSpec->getIdentifier()) break; 7378 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7379 7380 // A well-formed anonymous tag must always be a TUK_Definition. 7381 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7382 7383 // The type must match the tag exactly; no qualifiers allowed. 7384 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7385 break; 7386 7387 // Otherwise, set this is the anon-decl typedef for the tag. 7388 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7389 break; 7390 } 7391 7392 default: 7393 break; 7394 } 7395 7396 return NewTD; 7397} 7398 7399 7400/// \brief Determine whether a tag with a given kind is acceptable 7401/// as a redeclaration of the given tag declaration. 7402/// 7403/// \returns true if the new tag kind is acceptable, false otherwise. 7404bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7405 TagTypeKind NewTag, bool isDefinition, 7406 SourceLocation NewTagLoc, 7407 const IdentifierInfo &Name) { 7408 // C++ [dcl.type.elab]p3: 7409 // The class-key or enum keyword present in the 7410 // elaborated-type-specifier shall agree in kind with the 7411 // declaration to which the name in the elaborated-type-specifier 7412 // refers. This rule also applies to the form of 7413 // elaborated-type-specifier that declares a class-name or 7414 // friend class since it can be construed as referring to the 7415 // definition of the class. Thus, in any 7416 // elaborated-type-specifier, the enum keyword shall be used to 7417 // refer to an enumeration (7.2), the union class-key shall be 7418 // used to refer to a union (clause 9), and either the class or 7419 // struct class-key shall be used to refer to a class (clause 9) 7420 // declared using the class or struct class-key. 7421 TagTypeKind OldTag = Previous->getTagKind(); 7422 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7423 if (OldTag == NewTag) 7424 return true; 7425 7426 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7427 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7428 // Warn about the struct/class tag mismatch. 7429 bool isTemplate = false; 7430 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7431 isTemplate = Record->getDescribedClassTemplate(); 7432 7433 if (!ActiveTemplateInstantiations.empty()) { 7434 // In a template instantiation, do not offer fix-its for tag mismatches 7435 // since they usually mess up the template instead of fixing the problem. 7436 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7437 << (NewTag == TTK_Class) << isTemplate << &Name; 7438 return true; 7439 } 7440 7441 if (isDefinition) { 7442 // On definitions, check previous tags and issue a fix-it for each 7443 // one that doesn't match the current tag. 7444 if (Previous->getDefinition()) { 7445 // Don't suggest fix-its for redefinitions. 7446 return true; 7447 } 7448 7449 bool previousMismatch = false; 7450 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7451 E(Previous->redecls_end()); I != E; ++I) { 7452 if (I->getTagKind() != NewTag) { 7453 if (!previousMismatch) { 7454 previousMismatch = true; 7455 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7456 << (NewTag == TTK_Class) << isTemplate << &Name; 7457 } 7458 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7459 << (NewTag == TTK_Class) 7460 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7461 NewTag == TTK_Class? 7462 "class" : "struct"); 7463 } 7464 } 7465 return true; 7466 } 7467 7468 // Check for a previous definition. If current tag and definition 7469 // are same type, do nothing. If no definition, but disagree with 7470 // with previous tag type, give a warning, but no fix-it. 7471 const TagDecl *Redecl = Previous->getDefinition() ? 7472 Previous->getDefinition() : Previous; 7473 if (Redecl->getTagKind() == NewTag) { 7474 return true; 7475 } 7476 7477 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7478 << (NewTag == TTK_Class) 7479 << isTemplate << &Name; 7480 Diag(Redecl->getLocation(), diag::note_previous_use); 7481 7482 // If there is a previous defintion, suggest a fix-it. 7483 if (Previous->getDefinition()) { 7484 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7485 << (Redecl->getTagKind() == TTK_Class) 7486 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7487 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7488 } 7489 7490 return true; 7491 } 7492 return false; 7493} 7494 7495/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7496/// former case, Name will be non-null. In the later case, Name will be null. 7497/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7498/// reference/declaration/definition of a tag. 7499Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7500 SourceLocation KWLoc, CXXScopeSpec &SS, 7501 IdentifierInfo *Name, SourceLocation NameLoc, 7502 AttributeList *Attr, AccessSpecifier AS, 7503 SourceLocation ModulePrivateLoc, 7504 MultiTemplateParamsArg TemplateParameterLists, 7505 bool &OwnedDecl, bool &IsDependent, 7506 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7507 TypeResult UnderlyingType) { 7508 // If this is not a definition, it must have a name. 7509 assert((Name != 0 || TUK == TUK_Definition) && 7510 "Nameless record must be a definition!"); 7511 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7512 7513 OwnedDecl = false; 7514 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7515 7516 // FIXME: Check explicit specializations more carefully. 7517 bool isExplicitSpecialization = false; 7518 bool Invalid = false; 7519 7520 // We only need to do this matching if we have template parameters 7521 // or a scope specifier, which also conveniently avoids this work 7522 // for non-C++ cases. 7523 if (TemplateParameterLists.size() > 0 || 7524 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7525 if (TemplateParameterList *TemplateParams 7526 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7527 TemplateParameterLists.get(), 7528 TemplateParameterLists.size(), 7529 TUK == TUK_Friend, 7530 isExplicitSpecialization, 7531 Invalid)) { 7532 if (TemplateParams->size() > 0) { 7533 // This is a declaration or definition of a class template (which may 7534 // be a member of another template). 7535 7536 if (Invalid) 7537 return 0; 7538 7539 OwnedDecl = false; 7540 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7541 SS, Name, NameLoc, Attr, 7542 TemplateParams, AS, 7543 ModulePrivateLoc, 7544 TemplateParameterLists.size() - 1, 7545 (TemplateParameterList**) TemplateParameterLists.release()); 7546 return Result.get(); 7547 } else { 7548 // The "template<>" header is extraneous. 7549 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7550 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7551 isExplicitSpecialization = true; 7552 } 7553 } 7554 } 7555 7556 // Figure out the underlying type if this a enum declaration. We need to do 7557 // this early, because it's needed to detect if this is an incompatible 7558 // redeclaration. 7559 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7560 7561 if (Kind == TTK_Enum) { 7562 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7563 // No underlying type explicitly specified, or we failed to parse the 7564 // type, default to int. 7565 EnumUnderlying = Context.IntTy.getTypePtr(); 7566 else if (UnderlyingType.get()) { 7567 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7568 // integral type; any cv-qualification is ignored. 7569 TypeSourceInfo *TI = 0; 7570 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7571 EnumUnderlying = TI; 7572 7573 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7574 7575 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7576 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7577 << T; 7578 // Recover by falling back to int. 7579 EnumUnderlying = Context.IntTy.getTypePtr(); 7580 } 7581 7582 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7583 UPPC_FixedUnderlyingType)) 7584 EnumUnderlying = Context.IntTy.getTypePtr(); 7585 7586 } else if (getLangOptions().MicrosoftExt) 7587 // Microsoft enums are always of int type. 7588 EnumUnderlying = Context.IntTy.getTypePtr(); 7589 } 7590 7591 DeclContext *SearchDC = CurContext; 7592 DeclContext *DC = CurContext; 7593 bool isStdBadAlloc = false; 7594 7595 RedeclarationKind Redecl = ForRedeclaration; 7596 if (TUK == TUK_Friend || TUK == TUK_Reference) 7597 Redecl = NotForRedeclaration; 7598 7599 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7600 7601 if (Name && SS.isNotEmpty()) { 7602 // We have a nested-name tag ('struct foo::bar'). 7603 7604 // Check for invalid 'foo::'. 7605 if (SS.isInvalid()) { 7606 Name = 0; 7607 goto CreateNewDecl; 7608 } 7609 7610 // If this is a friend or a reference to a class in a dependent 7611 // context, don't try to make a decl for it. 7612 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7613 DC = computeDeclContext(SS, false); 7614 if (!DC) { 7615 IsDependent = true; 7616 return 0; 7617 } 7618 } else { 7619 DC = computeDeclContext(SS, true); 7620 if (!DC) { 7621 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7622 << SS.getRange(); 7623 return 0; 7624 } 7625 } 7626 7627 if (RequireCompleteDeclContext(SS, DC)) 7628 return 0; 7629 7630 SearchDC = DC; 7631 // Look-up name inside 'foo::'. 7632 LookupQualifiedName(Previous, DC); 7633 7634 if (Previous.isAmbiguous()) 7635 return 0; 7636 7637 if (Previous.empty()) { 7638 // Name lookup did not find anything. However, if the 7639 // nested-name-specifier refers to the current instantiation, 7640 // and that current instantiation has any dependent base 7641 // classes, we might find something at instantiation time: treat 7642 // this as a dependent elaborated-type-specifier. 7643 // But this only makes any sense for reference-like lookups. 7644 if (Previous.wasNotFoundInCurrentInstantiation() && 7645 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7646 IsDependent = true; 7647 return 0; 7648 } 7649 7650 // A tag 'foo::bar' must already exist. 7651 Diag(NameLoc, diag::err_not_tag_in_scope) 7652 << Kind << Name << DC << SS.getRange(); 7653 Name = 0; 7654 Invalid = true; 7655 goto CreateNewDecl; 7656 } 7657 } else if (Name) { 7658 // If this is a named struct, check to see if there was a previous forward 7659 // declaration or definition. 7660 // FIXME: We're looking into outer scopes here, even when we 7661 // shouldn't be. Doing so can result in ambiguities that we 7662 // shouldn't be diagnosing. 7663 LookupName(Previous, S); 7664 7665 if (Previous.isAmbiguous() && 7666 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7667 LookupResult::Filter F = Previous.makeFilter(); 7668 while (F.hasNext()) { 7669 NamedDecl *ND = F.next(); 7670 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7671 F.erase(); 7672 } 7673 F.done(); 7674 } 7675 7676 // Note: there used to be some attempt at recovery here. 7677 if (Previous.isAmbiguous()) 7678 return 0; 7679 7680 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7681 // FIXME: This makes sure that we ignore the contexts associated 7682 // with C structs, unions, and enums when looking for a matching 7683 // tag declaration or definition. See the similar lookup tweak 7684 // in Sema::LookupName; is there a better way to deal with this? 7685 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7686 SearchDC = SearchDC->getParent(); 7687 } 7688 } else if (S->isFunctionPrototypeScope()) { 7689 // If this is an enum declaration in function prototype scope, set its 7690 // initial context to the translation unit. 7691 SearchDC = Context.getTranslationUnitDecl(); 7692 } 7693 7694 if (Previous.isSingleResult() && 7695 Previous.getFoundDecl()->isTemplateParameter()) { 7696 // Maybe we will complain about the shadowed template parameter. 7697 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7698 // Just pretend that we didn't see the previous declaration. 7699 Previous.clear(); 7700 } 7701 7702 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7703 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7704 // This is a declaration of or a reference to "std::bad_alloc". 7705 isStdBadAlloc = true; 7706 7707 if (Previous.empty() && StdBadAlloc) { 7708 // std::bad_alloc has been implicitly declared (but made invisible to 7709 // name lookup). Fill in this implicit declaration as the previous 7710 // declaration, so that the declarations get chained appropriately. 7711 Previous.addDecl(getStdBadAlloc()); 7712 } 7713 } 7714 7715 // If we didn't find a previous declaration, and this is a reference 7716 // (or friend reference), move to the correct scope. In C++, we 7717 // also need to do a redeclaration lookup there, just in case 7718 // there's a shadow friend decl. 7719 if (Name && Previous.empty() && 7720 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7721 if (Invalid) goto CreateNewDecl; 7722 assert(SS.isEmpty()); 7723 7724 if (TUK == TUK_Reference) { 7725 // C++ [basic.scope.pdecl]p5: 7726 // -- for an elaborated-type-specifier of the form 7727 // 7728 // class-key identifier 7729 // 7730 // if the elaborated-type-specifier is used in the 7731 // decl-specifier-seq or parameter-declaration-clause of a 7732 // function defined in namespace scope, the identifier is 7733 // declared as a class-name in the namespace that contains 7734 // the declaration; otherwise, except as a friend 7735 // declaration, the identifier is declared in the smallest 7736 // non-class, non-function-prototype scope that contains the 7737 // declaration. 7738 // 7739 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7740 // C structs and unions. 7741 // 7742 // It is an error in C++ to declare (rather than define) an enum 7743 // type, including via an elaborated type specifier. We'll 7744 // diagnose that later; for now, declare the enum in the same 7745 // scope as we would have picked for any other tag type. 7746 // 7747 // GNU C also supports this behavior as part of its incomplete 7748 // enum types extension, while GNU C++ does not. 7749 // 7750 // Find the context where we'll be declaring the tag. 7751 // FIXME: We would like to maintain the current DeclContext as the 7752 // lexical context, 7753 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7754 SearchDC = SearchDC->getParent(); 7755 7756 // Find the scope where we'll be declaring the tag. 7757 while (S->isClassScope() || 7758 (getLangOptions().CPlusPlus && 7759 S->isFunctionPrototypeScope()) || 7760 ((S->getFlags() & Scope::DeclScope) == 0) || 7761 (S->getEntity() && 7762 ((DeclContext *)S->getEntity())->isTransparentContext())) 7763 S = S->getParent(); 7764 } else { 7765 assert(TUK == TUK_Friend); 7766 // C++ [namespace.memdef]p3: 7767 // If a friend declaration in a non-local class first declares a 7768 // class or function, the friend class or function is a member of 7769 // the innermost enclosing namespace. 7770 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7771 } 7772 7773 // In C++, we need to do a redeclaration lookup to properly 7774 // diagnose some problems. 7775 if (getLangOptions().CPlusPlus) { 7776 Previous.setRedeclarationKind(ForRedeclaration); 7777 LookupQualifiedName(Previous, SearchDC); 7778 } 7779 } 7780 7781 if (!Previous.empty()) { 7782 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7783 7784 // It's okay to have a tag decl in the same scope as a typedef 7785 // which hides a tag decl in the same scope. Finding this 7786 // insanity with a redeclaration lookup can only actually happen 7787 // in C++. 7788 // 7789 // This is also okay for elaborated-type-specifiers, which is 7790 // technically forbidden by the current standard but which is 7791 // okay according to the likely resolution of an open issue; 7792 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7793 if (getLangOptions().CPlusPlus) { 7794 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7795 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7796 TagDecl *Tag = TT->getDecl(); 7797 if (Tag->getDeclName() == Name && 7798 Tag->getDeclContext()->getRedeclContext() 7799 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7800 PrevDecl = Tag; 7801 Previous.clear(); 7802 Previous.addDecl(Tag); 7803 Previous.resolveKind(); 7804 } 7805 } 7806 } 7807 } 7808 7809 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7810 // If this is a use of a previous tag, or if the tag is already declared 7811 // in the same scope (so that the definition/declaration completes or 7812 // rementions the tag), reuse the decl. 7813 if (TUK == TUK_Reference || TUK == TUK_Friend || 7814 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7815 // Make sure that this wasn't declared as an enum and now used as a 7816 // struct or something similar. 7817 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7818 TUK == TUK_Definition, KWLoc, 7819 *Name)) { 7820 bool SafeToContinue 7821 = (PrevTagDecl->getTagKind() != TTK_Enum && 7822 Kind != TTK_Enum); 7823 if (SafeToContinue) 7824 Diag(KWLoc, diag::err_use_with_wrong_tag) 7825 << Name 7826 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7827 PrevTagDecl->getKindName()); 7828 else 7829 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7830 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7831 7832 if (SafeToContinue) 7833 Kind = PrevTagDecl->getTagKind(); 7834 else { 7835 // Recover by making this an anonymous redefinition. 7836 Name = 0; 7837 Previous.clear(); 7838 Invalid = true; 7839 } 7840 } 7841 7842 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7843 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7844 7845 // All conflicts with previous declarations are recovered by 7846 // returning the previous declaration. 7847 if (ScopedEnum != PrevEnum->isScoped()) { 7848 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7849 << PrevEnum->isScoped(); 7850 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7851 return PrevTagDecl; 7852 } 7853 else if (EnumUnderlying && PrevEnum->isFixed()) { 7854 QualType T; 7855 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7856 T = TI->getType(); 7857 else 7858 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7859 7860 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7861 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7862 diag::err_enum_redeclare_type_mismatch) 7863 << T 7864 << PrevEnum->getIntegerType(); 7865 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7866 return PrevTagDecl; 7867 } 7868 } 7869 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7870 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7871 << PrevEnum->isFixed(); 7872 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7873 return PrevTagDecl; 7874 } 7875 } 7876 7877 if (!Invalid) { 7878 // If this is a use, just return the declaration we found. 7879 7880 // FIXME: In the future, return a variant or some other clue 7881 // for the consumer of this Decl to know it doesn't own it. 7882 // For our current ASTs this shouldn't be a problem, but will 7883 // need to be changed with DeclGroups. 7884 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7885 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7886 return PrevTagDecl; 7887 7888 // Diagnose attempts to redefine a tag. 7889 if (TUK == TUK_Definition) { 7890 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7891 // If we're defining a specialization and the previous definition 7892 // is from an implicit instantiation, don't emit an error 7893 // here; we'll catch this in the general case below. 7894 if (!isExplicitSpecialization || 7895 !isa<CXXRecordDecl>(Def) || 7896 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7897 == TSK_ExplicitSpecialization) { 7898 Diag(NameLoc, diag::err_redefinition) << Name; 7899 Diag(Def->getLocation(), diag::note_previous_definition); 7900 // If this is a redefinition, recover by making this 7901 // struct be anonymous, which will make any later 7902 // references get the previous definition. 7903 Name = 0; 7904 Previous.clear(); 7905 Invalid = true; 7906 } 7907 } else { 7908 // If the type is currently being defined, complain 7909 // about a nested redefinition. 7910 const TagType *Tag 7911 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7912 if (Tag->isBeingDefined()) { 7913 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7914 Diag(PrevTagDecl->getLocation(), 7915 diag::note_previous_definition); 7916 Name = 0; 7917 Previous.clear(); 7918 Invalid = true; 7919 } 7920 } 7921 7922 // Okay, this is definition of a previously declared or referenced 7923 // tag PrevDecl. We're going to create a new Decl for it. 7924 } 7925 } 7926 // If we get here we have (another) forward declaration or we 7927 // have a definition. Just create a new decl. 7928 7929 } else { 7930 // If we get here, this is a definition of a new tag type in a nested 7931 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7932 // new decl/type. We set PrevDecl to NULL so that the entities 7933 // have distinct types. 7934 Previous.clear(); 7935 } 7936 // If we get here, we're going to create a new Decl. If PrevDecl 7937 // is non-NULL, it's a definition of the tag declared by 7938 // PrevDecl. If it's NULL, we have a new definition. 7939 7940 7941 // Otherwise, PrevDecl is not a tag, but was found with tag 7942 // lookup. This is only actually possible in C++, where a few 7943 // things like templates still live in the tag namespace. 7944 } else { 7945 assert(getLangOptions().CPlusPlus); 7946 7947 // Use a better diagnostic if an elaborated-type-specifier 7948 // found the wrong kind of type on the first 7949 // (non-redeclaration) lookup. 7950 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7951 !Previous.isForRedeclaration()) { 7952 unsigned Kind = 0; 7953 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7954 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7955 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7956 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7957 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7958 Invalid = true; 7959 7960 // Otherwise, only diagnose if the declaration is in scope. 7961 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7962 isExplicitSpecialization)) { 7963 // do nothing 7964 7965 // Diagnose implicit declarations introduced by elaborated types. 7966 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7967 unsigned Kind = 0; 7968 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7969 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7970 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7971 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7972 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7973 Invalid = true; 7974 7975 // Otherwise it's a declaration. Call out a particularly common 7976 // case here. 7977 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7978 unsigned Kind = 0; 7979 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7980 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7981 << Name << Kind << TND->getUnderlyingType(); 7982 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7983 Invalid = true; 7984 7985 // Otherwise, diagnose. 7986 } else { 7987 // The tag name clashes with something else in the target scope, 7988 // issue an error and recover by making this tag be anonymous. 7989 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7990 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7991 Name = 0; 7992 Invalid = true; 7993 } 7994 7995 // The existing declaration isn't relevant to us; we're in a 7996 // new scope, so clear out the previous declaration. 7997 Previous.clear(); 7998 } 7999 } 8000 8001CreateNewDecl: 8002 8003 TagDecl *PrevDecl = 0; 8004 if (Previous.isSingleResult()) 8005 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8006 8007 // If there is an identifier, use the location of the identifier as the 8008 // location of the decl, otherwise use the location of the struct/union 8009 // keyword. 8010 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8011 8012 // Otherwise, create a new declaration. If there is a previous 8013 // declaration of the same entity, the two will be linked via 8014 // PrevDecl. 8015 TagDecl *New; 8016 8017 bool IsForwardReference = false; 8018 if (Kind == TTK_Enum) { 8019 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8020 // enum X { A, B, C } D; D should chain to X. 8021 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8022 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8023 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8024 // If this is an undefined enum, warn. 8025 if (TUK != TUK_Definition && !Invalid) { 8026 TagDecl *Def; 8027 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8028 // C++0x: 7.2p2: opaque-enum-declaration. 8029 // Conflicts are diagnosed above. Do nothing. 8030 } 8031 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8032 Diag(Loc, diag::ext_forward_ref_enum_def) 8033 << New; 8034 Diag(Def->getLocation(), diag::note_previous_definition); 8035 } else { 8036 unsigned DiagID = diag::ext_forward_ref_enum; 8037 if (getLangOptions().MicrosoftExt) 8038 DiagID = diag::ext_ms_forward_ref_enum; 8039 else if (getLangOptions().CPlusPlus) 8040 DiagID = diag::err_forward_ref_enum; 8041 Diag(Loc, DiagID); 8042 8043 // If this is a forward-declared reference to an enumeration, make a 8044 // note of it; we won't actually be introducing the declaration into 8045 // the declaration context. 8046 if (TUK == TUK_Reference) 8047 IsForwardReference = true; 8048 } 8049 } 8050 8051 if (EnumUnderlying) { 8052 EnumDecl *ED = cast<EnumDecl>(New); 8053 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8054 ED->setIntegerTypeSourceInfo(TI); 8055 else 8056 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8057 ED->setPromotionType(ED->getIntegerType()); 8058 } 8059 8060 } else { 8061 // struct/union/class 8062 8063 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8064 // struct X { int A; } D; D should chain to X. 8065 if (getLangOptions().CPlusPlus) { 8066 // FIXME: Look for a way to use RecordDecl for simple structs. 8067 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8068 cast_or_null<CXXRecordDecl>(PrevDecl)); 8069 8070 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8071 StdBadAlloc = cast<CXXRecordDecl>(New); 8072 } else 8073 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8074 cast_or_null<RecordDecl>(PrevDecl)); 8075 } 8076 8077 // Maybe add qualifier info. 8078 if (SS.isNotEmpty()) { 8079 if (SS.isSet()) { 8080 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8081 if (TemplateParameterLists.size() > 0) { 8082 New->setTemplateParameterListsInfo(Context, 8083 TemplateParameterLists.size(), 8084 (TemplateParameterList**) TemplateParameterLists.release()); 8085 } 8086 } 8087 else 8088 Invalid = true; 8089 } 8090 8091 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8092 // Add alignment attributes if necessary; these attributes are checked when 8093 // the ASTContext lays out the structure. 8094 // 8095 // It is important for implementing the correct semantics that this 8096 // happen here (in act on tag decl). The #pragma pack stack is 8097 // maintained as a result of parser callbacks which can occur at 8098 // many points during the parsing of a struct declaration (because 8099 // the #pragma tokens are effectively skipped over during the 8100 // parsing of the struct). 8101 AddAlignmentAttributesForRecord(RD); 8102 8103 AddMsStructLayoutForRecord(RD); 8104 } 8105 8106 if (PrevDecl && PrevDecl->isModulePrivate()) 8107 New->setModulePrivate(); 8108 else if (ModulePrivateLoc.isValid()) { 8109 if (isExplicitSpecialization) 8110 Diag(New->getLocation(), diag::err_module_private_specialization) 8111 << 2 8112 << FixItHint::CreateRemoval(ModulePrivateLoc); 8113 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8114 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8115 // __module_private__ does not apply to local classes. However, we only 8116 // diagnose this as an error when the declaration specifiers are 8117 // freestanding. Here, we just ignore the __module_private__. 8118 // foobar 8119 else if (!SearchDC->isFunctionOrMethod()) 8120 New->setModulePrivate(); 8121 } 8122 8123 // If this is a specialization of a member class (of a class template), 8124 // check the specialization. 8125 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8126 Invalid = true; 8127 8128 if (Invalid) 8129 New->setInvalidDecl(); 8130 8131 if (Attr) 8132 ProcessDeclAttributeList(S, New, Attr); 8133 8134 // If we're declaring or defining a tag in function prototype scope 8135 // in C, note that this type can only be used within the function. 8136 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8137 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8138 8139 // Set the lexical context. If the tag has a C++ scope specifier, the 8140 // lexical context will be different from the semantic context. 8141 New->setLexicalDeclContext(CurContext); 8142 8143 // Mark this as a friend decl if applicable. 8144 // In Microsoft mode, a friend declaration also acts as a forward 8145 // declaration so we always pass true to setObjectOfFriendDecl to make 8146 // the tag name visible. 8147 if (TUK == TUK_Friend) 8148 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8149 getLangOptions().MicrosoftExt); 8150 8151 // Set the access specifier. 8152 if (!Invalid && SearchDC->isRecord()) 8153 SetMemberAccessSpecifier(New, PrevDecl, AS); 8154 8155 if (TUK == TUK_Definition) 8156 New->startDefinition(); 8157 8158 // If this has an identifier, add it to the scope stack. 8159 if (TUK == TUK_Friend) { 8160 // We might be replacing an existing declaration in the lookup tables; 8161 // if so, borrow its access specifier. 8162 if (PrevDecl) 8163 New->setAccess(PrevDecl->getAccess()); 8164 8165 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8166 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8167 if (Name) // can be null along some error paths 8168 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8169 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8170 } else if (Name) { 8171 S = getNonFieldDeclScope(S); 8172 PushOnScopeChains(New, S, !IsForwardReference); 8173 if (IsForwardReference) 8174 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8175 8176 } else { 8177 CurContext->addDecl(New); 8178 } 8179 8180 // If this is the C FILE type, notify the AST context. 8181 if (IdentifierInfo *II = New->getIdentifier()) 8182 if (!New->isInvalidDecl() && 8183 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8184 II->isStr("FILE")) 8185 Context.setFILEDecl(New); 8186 8187 OwnedDecl = true; 8188 return New; 8189} 8190 8191void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8192 AdjustDeclIfTemplate(TagD); 8193 TagDecl *Tag = cast<TagDecl>(TagD); 8194 8195 // Enter the tag context. 8196 PushDeclContext(S, Tag); 8197} 8198 8199Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8200 assert(isa<ObjCContainerDecl>(IDecl) && 8201 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8202 DeclContext *OCD = cast<DeclContext>(IDecl); 8203 assert(getContainingDC(OCD) == CurContext && 8204 "The next DeclContext should be lexically contained in the current one."); 8205 CurContext = OCD; 8206 return IDecl; 8207} 8208 8209void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8210 SourceLocation FinalLoc, 8211 SourceLocation LBraceLoc) { 8212 AdjustDeclIfTemplate(TagD); 8213 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8214 8215 FieldCollector->StartClass(); 8216 8217 if (!Record->getIdentifier()) 8218 return; 8219 8220 if (FinalLoc.isValid()) 8221 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8222 8223 // C++ [class]p2: 8224 // [...] The class-name is also inserted into the scope of the 8225 // class itself; this is known as the injected-class-name. For 8226 // purposes of access checking, the injected-class-name is treated 8227 // as if it were a public member name. 8228 CXXRecordDecl *InjectedClassName 8229 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8230 Record->getLocStart(), Record->getLocation(), 8231 Record->getIdentifier(), 8232 /*PrevDecl=*/0, 8233 /*DelayTypeCreation=*/true); 8234 Context.getTypeDeclType(InjectedClassName, Record); 8235 InjectedClassName->setImplicit(); 8236 InjectedClassName->setAccess(AS_public); 8237 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8238 InjectedClassName->setDescribedClassTemplate(Template); 8239 PushOnScopeChains(InjectedClassName, S); 8240 assert(InjectedClassName->isInjectedClassName() && 8241 "Broken injected-class-name"); 8242} 8243 8244void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8245 SourceLocation RBraceLoc) { 8246 AdjustDeclIfTemplate(TagD); 8247 TagDecl *Tag = cast<TagDecl>(TagD); 8248 Tag->setRBraceLoc(RBraceLoc); 8249 8250 if (isa<CXXRecordDecl>(Tag)) 8251 FieldCollector->FinishClass(); 8252 8253 // Exit this scope of this tag's definition. 8254 PopDeclContext(); 8255 8256 // Notify the consumer that we've defined a tag. 8257 Consumer.HandleTagDeclDefinition(Tag); 8258} 8259 8260void Sema::ActOnObjCContainerFinishDefinition() { 8261 // Exit this scope of this interface definition. 8262 PopDeclContext(); 8263} 8264 8265void Sema::ActOnObjCTemporaryExitContainerContext() { 8266 OriginalLexicalContext = CurContext; 8267 ActOnObjCContainerFinishDefinition(); 8268} 8269 8270void Sema::ActOnObjCReenterContainerContext() { 8271 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8272 OriginalLexicalContext = 0; 8273} 8274 8275void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8276 AdjustDeclIfTemplate(TagD); 8277 TagDecl *Tag = cast<TagDecl>(TagD); 8278 Tag->setInvalidDecl(); 8279 8280 // We're undoing ActOnTagStartDefinition here, not 8281 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8282 // the FieldCollector. 8283 8284 PopDeclContext(); 8285} 8286 8287// Note that FieldName may be null for anonymous bitfields. 8288bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8289 QualType FieldTy, const Expr *BitWidth, 8290 bool *ZeroWidth) { 8291 // Default to true; that shouldn't confuse checks for emptiness 8292 if (ZeroWidth) 8293 *ZeroWidth = true; 8294 8295 // C99 6.7.2.1p4 - verify the field type. 8296 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8297 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8298 // Handle incomplete types with specific error. 8299 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8300 return true; 8301 if (FieldName) 8302 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8303 << FieldName << FieldTy << BitWidth->getSourceRange(); 8304 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8305 << FieldTy << BitWidth->getSourceRange(); 8306 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8307 UPPC_BitFieldWidth)) 8308 return true; 8309 8310 // If the bit-width is type- or value-dependent, don't try to check 8311 // it now. 8312 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8313 return false; 8314 8315 llvm::APSInt Value; 8316 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8317 return true; 8318 8319 if (Value != 0 && ZeroWidth) 8320 *ZeroWidth = false; 8321 8322 // Zero-width bitfield is ok for anonymous field. 8323 if (Value == 0 && FieldName) 8324 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8325 8326 if (Value.isSigned() && Value.isNegative()) { 8327 if (FieldName) 8328 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8329 << FieldName << Value.toString(10); 8330 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8331 << Value.toString(10); 8332 } 8333 8334 if (!FieldTy->isDependentType()) { 8335 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8336 if (Value.getZExtValue() > TypeSize) { 8337 if (!getLangOptions().CPlusPlus) { 8338 if (FieldName) 8339 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8340 << FieldName << (unsigned)Value.getZExtValue() 8341 << (unsigned)TypeSize; 8342 8343 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8344 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8345 } 8346 8347 if (FieldName) 8348 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8349 << FieldName << (unsigned)Value.getZExtValue() 8350 << (unsigned)TypeSize; 8351 else 8352 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8353 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8354 } 8355 } 8356 8357 return false; 8358} 8359 8360/// ActOnField - Each field of a C struct/union is passed into this in order 8361/// to create a FieldDecl object for it. 8362Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8363 Declarator &D, Expr *BitfieldWidth) { 8364 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8365 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8366 /*HasInit=*/false, AS_public); 8367 return Res; 8368} 8369 8370/// HandleField - Analyze a field of a C struct or a C++ data member. 8371/// 8372FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8373 SourceLocation DeclStart, 8374 Declarator &D, Expr *BitWidth, bool HasInit, 8375 AccessSpecifier AS) { 8376 IdentifierInfo *II = D.getIdentifier(); 8377 SourceLocation Loc = DeclStart; 8378 if (II) Loc = D.getIdentifierLoc(); 8379 8380 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8381 QualType T = TInfo->getType(); 8382 if (getLangOptions().CPlusPlus) { 8383 CheckExtraCXXDefaultArguments(D); 8384 8385 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8386 UPPC_DataMemberType)) { 8387 D.setInvalidType(); 8388 T = Context.IntTy; 8389 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8390 } 8391 } 8392 8393 DiagnoseFunctionSpecifiers(D); 8394 8395 if (D.getDeclSpec().isThreadSpecified()) 8396 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8397 if (D.getDeclSpec().isConstexprSpecified()) 8398 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8399 << 2; 8400 8401 // Check to see if this name was declared as a member previously 8402 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8403 LookupName(Previous, S); 8404 assert((Previous.empty() || Previous.isOverloadedResult() || 8405 Previous.isSingleResult()) 8406 && "Lookup of member name should be either overloaded, single or null"); 8407 8408 // If the name is overloaded then get any declaration else get the single result 8409 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8410 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8411 8412 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8413 // Maybe we will complain about the shadowed template parameter. 8414 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8415 // Just pretend that we didn't see the previous declaration. 8416 PrevDecl = 0; 8417 } 8418 8419 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8420 PrevDecl = 0; 8421 8422 bool Mutable 8423 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8424 SourceLocation TSSL = D.getSourceRange().getBegin(); 8425 FieldDecl *NewFD 8426 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8427 TSSL, AS, PrevDecl, &D); 8428 8429 if (NewFD->isInvalidDecl()) 8430 Record->setInvalidDecl(); 8431 8432 if (D.getDeclSpec().isModulePrivateSpecified()) 8433 NewFD->setModulePrivate(); 8434 8435 if (NewFD->isInvalidDecl() && PrevDecl) { 8436 // Don't introduce NewFD into scope; there's already something 8437 // with the same name in the same scope. 8438 } else if (II) { 8439 PushOnScopeChains(NewFD, S); 8440 } else 8441 Record->addDecl(NewFD); 8442 8443 return NewFD; 8444} 8445 8446/// \brief Build a new FieldDecl and check its well-formedness. 8447/// 8448/// This routine builds a new FieldDecl given the fields name, type, 8449/// record, etc. \p PrevDecl should refer to any previous declaration 8450/// with the same name and in the same scope as the field to be 8451/// created. 8452/// 8453/// \returns a new FieldDecl. 8454/// 8455/// \todo The Declarator argument is a hack. It will be removed once 8456FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8457 TypeSourceInfo *TInfo, 8458 RecordDecl *Record, SourceLocation Loc, 8459 bool Mutable, Expr *BitWidth, bool HasInit, 8460 SourceLocation TSSL, 8461 AccessSpecifier AS, NamedDecl *PrevDecl, 8462 Declarator *D) { 8463 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8464 bool InvalidDecl = false; 8465 if (D) InvalidDecl = D->isInvalidType(); 8466 8467 // If we receive a broken type, recover by assuming 'int' and 8468 // marking this declaration as invalid. 8469 if (T.isNull()) { 8470 InvalidDecl = true; 8471 T = Context.IntTy; 8472 } 8473 8474 QualType EltTy = Context.getBaseElementType(T); 8475 if (!EltTy->isDependentType() && 8476 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8477 // Fields of incomplete type force their record to be invalid. 8478 Record->setInvalidDecl(); 8479 InvalidDecl = true; 8480 } 8481 8482 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8483 // than a variably modified type. 8484 if (!InvalidDecl && T->isVariablyModifiedType()) { 8485 bool SizeIsNegative; 8486 llvm::APSInt Oversized; 8487 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8488 SizeIsNegative, 8489 Oversized); 8490 if (!FixedTy.isNull()) { 8491 Diag(Loc, diag::warn_illegal_constant_array_size); 8492 T = FixedTy; 8493 } else { 8494 if (SizeIsNegative) 8495 Diag(Loc, diag::err_typecheck_negative_array_size); 8496 else if (Oversized.getBoolValue()) 8497 Diag(Loc, diag::err_array_too_large) 8498 << Oversized.toString(10); 8499 else 8500 Diag(Loc, diag::err_typecheck_field_variable_size); 8501 InvalidDecl = true; 8502 } 8503 } 8504 8505 // Fields can not have abstract class types 8506 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8507 diag::err_abstract_type_in_decl, 8508 AbstractFieldType)) 8509 InvalidDecl = true; 8510 8511 bool ZeroWidth = false; 8512 // If this is declared as a bit-field, check the bit-field. 8513 if (!InvalidDecl && BitWidth && 8514 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8515 InvalidDecl = true; 8516 BitWidth = 0; 8517 ZeroWidth = false; 8518 } 8519 8520 // Check that 'mutable' is consistent with the type of the declaration. 8521 if (!InvalidDecl && Mutable) { 8522 unsigned DiagID = 0; 8523 if (T->isReferenceType()) 8524 DiagID = diag::err_mutable_reference; 8525 else if (T.isConstQualified()) 8526 DiagID = diag::err_mutable_const; 8527 8528 if (DiagID) { 8529 SourceLocation ErrLoc = Loc; 8530 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8531 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8532 Diag(ErrLoc, DiagID); 8533 Mutable = false; 8534 InvalidDecl = true; 8535 } 8536 } 8537 8538 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8539 BitWidth, Mutable, HasInit); 8540 if (InvalidDecl) 8541 NewFD->setInvalidDecl(); 8542 8543 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8544 Diag(Loc, diag::err_duplicate_member) << II; 8545 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8546 NewFD->setInvalidDecl(); 8547 } 8548 8549 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8550 if (Record->isUnion()) { 8551 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8552 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8553 if (RDecl->getDefinition()) { 8554 // C++ [class.union]p1: An object of a class with a non-trivial 8555 // constructor, a non-trivial copy constructor, a non-trivial 8556 // destructor, or a non-trivial copy assignment operator 8557 // cannot be a member of a union, nor can an array of such 8558 // objects. 8559 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8560 NewFD->setInvalidDecl(); 8561 } 8562 } 8563 8564 // C++ [class.union]p1: If a union contains a member of reference type, 8565 // the program is ill-formed. 8566 if (EltTy->isReferenceType()) { 8567 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8568 << NewFD->getDeclName() << EltTy; 8569 NewFD->setInvalidDecl(); 8570 } 8571 } 8572 } 8573 8574 // FIXME: We need to pass in the attributes given an AST 8575 // representation, not a parser representation. 8576 if (D) 8577 // FIXME: What to pass instead of TUScope? 8578 ProcessDeclAttributes(TUScope, NewFD, *D); 8579 8580 // In auto-retain/release, infer strong retension for fields of 8581 // retainable type. 8582 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8583 NewFD->setInvalidDecl(); 8584 8585 if (T.isObjCGCWeak()) 8586 Diag(Loc, diag::warn_attribute_weak_on_field); 8587 8588 NewFD->setAccess(AS); 8589 return NewFD; 8590} 8591 8592bool Sema::CheckNontrivialField(FieldDecl *FD) { 8593 assert(FD); 8594 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8595 8596 if (FD->isInvalidDecl()) 8597 return true; 8598 8599 QualType EltTy = Context.getBaseElementType(FD->getType()); 8600 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8601 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8602 if (RDecl->getDefinition()) { 8603 // We check for copy constructors before constructors 8604 // because otherwise we'll never get complaints about 8605 // copy constructors. 8606 8607 CXXSpecialMember member = CXXInvalid; 8608 if (!RDecl->hasTrivialCopyConstructor()) 8609 member = CXXCopyConstructor; 8610 else if (!RDecl->hasTrivialDefaultConstructor()) 8611 member = CXXDefaultConstructor; 8612 else if (!RDecl->hasTrivialCopyAssignment()) 8613 member = CXXCopyAssignment; 8614 else if (!RDecl->hasTrivialDestructor()) 8615 member = CXXDestructor; 8616 8617 if (member != CXXInvalid) { 8618 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8619 // Objective-C++ ARC: it is an error to have a non-trivial field of 8620 // a union. However, system headers in Objective-C programs 8621 // occasionally have Objective-C lifetime objects within unions, 8622 // and rather than cause the program to fail, we make those 8623 // members unavailable. 8624 SourceLocation Loc = FD->getLocation(); 8625 if (getSourceManager().isInSystemHeader(Loc)) { 8626 if (!FD->hasAttr<UnavailableAttr>()) 8627 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8628 "this system field has retaining ownership")); 8629 return false; 8630 } 8631 } 8632 8633 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8634 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8635 DiagnoseNontrivial(RT, member); 8636 return true; 8637 } 8638 } 8639 } 8640 8641 return false; 8642} 8643 8644/// DiagnoseNontrivial - Given that a class has a non-trivial 8645/// special member, figure out why. 8646void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8647 QualType QT(T, 0U); 8648 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8649 8650 // Check whether the member was user-declared. 8651 switch (member) { 8652 case CXXInvalid: 8653 break; 8654 8655 case CXXDefaultConstructor: 8656 if (RD->hasUserDeclaredConstructor()) { 8657 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8658 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8659 const FunctionDecl *body = 0; 8660 ci->hasBody(body); 8661 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8662 SourceLocation CtorLoc = ci->getLocation(); 8663 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8664 return; 8665 } 8666 } 8667 8668 llvm_unreachable("found no user-declared constructors"); 8669 } 8670 break; 8671 8672 case CXXCopyConstructor: 8673 if (RD->hasUserDeclaredCopyConstructor()) { 8674 SourceLocation CtorLoc = 8675 RD->getCopyConstructor(0)->getLocation(); 8676 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8677 return; 8678 } 8679 break; 8680 8681 case CXXMoveConstructor: 8682 if (RD->hasUserDeclaredMoveConstructor()) { 8683 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8684 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8685 return; 8686 } 8687 break; 8688 8689 case CXXCopyAssignment: 8690 if (RD->hasUserDeclaredCopyAssignment()) { 8691 // FIXME: this should use the location of the copy 8692 // assignment, not the type. 8693 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8694 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8695 return; 8696 } 8697 break; 8698 8699 case CXXMoveAssignment: 8700 if (RD->hasUserDeclaredMoveAssignment()) { 8701 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8702 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8703 return; 8704 } 8705 break; 8706 8707 case CXXDestructor: 8708 if (RD->hasUserDeclaredDestructor()) { 8709 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8710 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8711 return; 8712 } 8713 break; 8714 } 8715 8716 typedef CXXRecordDecl::base_class_iterator base_iter; 8717 8718 // Virtual bases and members inhibit trivial copying/construction, 8719 // but not trivial destruction. 8720 if (member != CXXDestructor) { 8721 // Check for virtual bases. vbases includes indirect virtual bases, 8722 // so we just iterate through the direct bases. 8723 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8724 if (bi->isVirtual()) { 8725 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8726 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8727 return; 8728 } 8729 8730 // Check for virtual methods. 8731 typedef CXXRecordDecl::method_iterator meth_iter; 8732 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8733 ++mi) { 8734 if (mi->isVirtual()) { 8735 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8736 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8737 return; 8738 } 8739 } 8740 } 8741 8742 bool (CXXRecordDecl::*hasTrivial)() const; 8743 switch (member) { 8744 case CXXDefaultConstructor: 8745 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8746 case CXXCopyConstructor: 8747 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8748 case CXXCopyAssignment: 8749 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8750 case CXXDestructor: 8751 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8752 default: 8753 llvm_unreachable("unexpected special member"); 8754 } 8755 8756 // Check for nontrivial bases (and recurse). 8757 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8758 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8759 assert(BaseRT && "Don't know how to handle dependent bases"); 8760 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8761 if (!(BaseRecTy->*hasTrivial)()) { 8762 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8763 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8764 DiagnoseNontrivial(BaseRT, member); 8765 return; 8766 } 8767 } 8768 8769 // Check for nontrivial members (and recurse). 8770 typedef RecordDecl::field_iterator field_iter; 8771 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8772 ++fi) { 8773 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8774 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8775 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8776 8777 if (!(EltRD->*hasTrivial)()) { 8778 SourceLocation FLoc = (*fi)->getLocation(); 8779 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8780 DiagnoseNontrivial(EltRT, member); 8781 return; 8782 } 8783 } 8784 8785 if (EltTy->isObjCLifetimeType()) { 8786 switch (EltTy.getObjCLifetime()) { 8787 case Qualifiers::OCL_None: 8788 case Qualifiers::OCL_ExplicitNone: 8789 break; 8790 8791 case Qualifiers::OCL_Autoreleasing: 8792 case Qualifiers::OCL_Weak: 8793 case Qualifiers::OCL_Strong: 8794 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8795 << QT << EltTy.getObjCLifetime(); 8796 return; 8797 } 8798 } 8799 } 8800 8801 llvm_unreachable("found no explanation for non-trivial member"); 8802} 8803 8804/// TranslateIvarVisibility - Translate visibility from a token ID to an 8805/// AST enum value. 8806static ObjCIvarDecl::AccessControl 8807TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8808 switch (ivarVisibility) { 8809 default: llvm_unreachable("Unknown visitibility kind"); 8810 case tok::objc_private: return ObjCIvarDecl::Private; 8811 case tok::objc_public: return ObjCIvarDecl::Public; 8812 case tok::objc_protected: return ObjCIvarDecl::Protected; 8813 case tok::objc_package: return ObjCIvarDecl::Package; 8814 } 8815} 8816 8817/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8818/// in order to create an IvarDecl object for it. 8819Decl *Sema::ActOnIvar(Scope *S, 8820 SourceLocation DeclStart, 8821 Declarator &D, Expr *BitfieldWidth, 8822 tok::ObjCKeywordKind Visibility) { 8823 8824 IdentifierInfo *II = D.getIdentifier(); 8825 Expr *BitWidth = (Expr*)BitfieldWidth; 8826 SourceLocation Loc = DeclStart; 8827 if (II) Loc = D.getIdentifierLoc(); 8828 8829 // FIXME: Unnamed fields can be handled in various different ways, for 8830 // example, unnamed unions inject all members into the struct namespace! 8831 8832 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8833 QualType T = TInfo->getType(); 8834 8835 if (BitWidth) { 8836 // 6.7.2.1p3, 6.7.2.1p4 8837 if (VerifyBitField(Loc, II, T, BitWidth)) { 8838 D.setInvalidType(); 8839 BitWidth = 0; 8840 } 8841 } else { 8842 // Not a bitfield. 8843 8844 // validate II. 8845 8846 } 8847 if (T->isReferenceType()) { 8848 Diag(Loc, diag::err_ivar_reference_type); 8849 D.setInvalidType(); 8850 } 8851 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8852 // than a variably modified type. 8853 else if (T->isVariablyModifiedType()) { 8854 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8855 D.setInvalidType(); 8856 } 8857 8858 // Get the visibility (access control) for this ivar. 8859 ObjCIvarDecl::AccessControl ac = 8860 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8861 : ObjCIvarDecl::None; 8862 // Must set ivar's DeclContext to its enclosing interface. 8863 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8864 ObjCContainerDecl *EnclosingContext; 8865 if (ObjCImplementationDecl *IMPDecl = 8866 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8867 if (!LangOpts.ObjCNonFragileABI2) { 8868 // Case of ivar declared in an implementation. Context is that of its class. 8869 EnclosingContext = IMPDecl->getClassInterface(); 8870 assert(EnclosingContext && "Implementation has no class interface!"); 8871 } 8872 else 8873 EnclosingContext = EnclosingDecl; 8874 } else { 8875 if (ObjCCategoryDecl *CDecl = 8876 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8877 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8878 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8879 return 0; 8880 } 8881 } 8882 EnclosingContext = EnclosingDecl; 8883 } 8884 8885 // Construct the decl. 8886 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8887 DeclStart, Loc, II, T, 8888 TInfo, ac, (Expr *)BitfieldWidth); 8889 8890 if (II) { 8891 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8892 ForRedeclaration); 8893 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8894 && !isa<TagDecl>(PrevDecl)) { 8895 Diag(Loc, diag::err_duplicate_member) << II; 8896 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8897 NewID->setInvalidDecl(); 8898 } 8899 } 8900 8901 // Process attributes attached to the ivar. 8902 ProcessDeclAttributes(S, NewID, D); 8903 8904 if (D.isInvalidType()) 8905 NewID->setInvalidDecl(); 8906 8907 // In ARC, infer 'retaining' for ivars of retainable type. 8908 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8909 NewID->setInvalidDecl(); 8910 8911 if (D.getDeclSpec().isModulePrivateSpecified()) 8912 NewID->setModulePrivate(); 8913 8914 if (II) { 8915 // FIXME: When interfaces are DeclContexts, we'll need to add 8916 // these to the interface. 8917 S->AddDecl(NewID); 8918 IdResolver.AddDecl(NewID); 8919 } 8920 8921 return NewID; 8922} 8923 8924/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8925/// class and class extensions. For every class @interface and class 8926/// extension @interface, if the last ivar is a bitfield of any type, 8927/// then add an implicit `char :0` ivar to the end of that interface. 8928void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8929 SmallVectorImpl<Decl *> &AllIvarDecls) { 8930 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8931 return; 8932 8933 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8934 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8935 8936 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8937 return; 8938 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8939 if (!ID) { 8940 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8941 if (!CD->IsClassExtension()) 8942 return; 8943 } 8944 // No need to add this to end of @implementation. 8945 else 8946 return; 8947 } 8948 // All conditions are met. Add a new bitfield to the tail end of ivars. 8949 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8950 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8951 8952 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8953 DeclLoc, DeclLoc, 0, 8954 Context.CharTy, 8955 Context.getTrivialTypeSourceInfo(Context.CharTy, 8956 DeclLoc), 8957 ObjCIvarDecl::Private, BW, 8958 true); 8959 AllIvarDecls.push_back(Ivar); 8960} 8961 8962void Sema::ActOnFields(Scope* S, 8963 SourceLocation RecLoc, Decl *EnclosingDecl, 8964 llvm::ArrayRef<Decl *> Fields, 8965 SourceLocation LBrac, SourceLocation RBrac, 8966 AttributeList *Attr) { 8967 assert(EnclosingDecl && "missing record or interface decl"); 8968 8969 // If the decl this is being inserted into is invalid, then it may be a 8970 // redeclaration or some other bogus case. Don't try to add fields to it. 8971 if (EnclosingDecl->isInvalidDecl()) 8972 return; 8973 8974 // Verify that all the fields are okay. 8975 unsigned NumNamedMembers = 0; 8976 SmallVector<FieldDecl*, 32> RecFields; 8977 8978 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8979 bool ARCErrReported = false; 8980 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8981 i != end; ++i) { 8982 FieldDecl *FD = cast<FieldDecl>(*i); 8983 8984 // Get the type for the field. 8985 const Type *FDTy = FD->getType().getTypePtr(); 8986 8987 if (!FD->isAnonymousStructOrUnion()) { 8988 // Remember all fields written by the user. 8989 RecFields.push_back(FD); 8990 } 8991 8992 // If the field is already invalid for some reason, don't emit more 8993 // diagnostics about it. 8994 if (FD->isInvalidDecl()) { 8995 EnclosingDecl->setInvalidDecl(); 8996 continue; 8997 } 8998 8999 // C99 6.7.2.1p2: 9000 // A structure or union shall not contain a member with 9001 // incomplete or function type (hence, a structure shall not 9002 // contain an instance of itself, but may contain a pointer to 9003 // an instance of itself), except that the last member of a 9004 // structure with more than one named member may have incomplete 9005 // array type; such a structure (and any union containing, 9006 // possibly recursively, a member that is such a structure) 9007 // shall not be a member of a structure or an element of an 9008 // array. 9009 if (FDTy->isFunctionType()) { 9010 // Field declared as a function. 9011 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9012 << FD->getDeclName(); 9013 FD->setInvalidDecl(); 9014 EnclosingDecl->setInvalidDecl(); 9015 continue; 9016 } else if (FDTy->isIncompleteArrayType() && Record && 9017 ((i + 1 == Fields.end() && !Record->isUnion()) || 9018 ((getLangOptions().MicrosoftExt || 9019 getLangOptions().CPlusPlus) && 9020 (i + 1 == Fields.end() || Record->isUnion())))) { 9021 // Flexible array member. 9022 // Microsoft and g++ is more permissive regarding flexible array. 9023 // It will accept flexible array in union and also 9024 // as the sole element of a struct/class. 9025 if (getLangOptions().MicrosoftExt) { 9026 if (Record->isUnion()) 9027 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9028 << FD->getDeclName(); 9029 else if (Fields.size() == 1) 9030 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9031 << FD->getDeclName() << Record->getTagKind(); 9032 } else if (getLangOptions().CPlusPlus) { 9033 if (Record->isUnion()) 9034 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9035 << FD->getDeclName(); 9036 else if (Fields.size() == 1) 9037 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9038 << FD->getDeclName() << Record->getTagKind(); 9039 } else if (NumNamedMembers < 1) { 9040 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9041 << FD->getDeclName(); 9042 FD->setInvalidDecl(); 9043 EnclosingDecl->setInvalidDecl(); 9044 continue; 9045 } 9046 if (!FD->getType()->isDependentType() && 9047 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9048 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9049 << FD->getDeclName() << FD->getType(); 9050 FD->setInvalidDecl(); 9051 EnclosingDecl->setInvalidDecl(); 9052 continue; 9053 } 9054 // Okay, we have a legal flexible array member at the end of the struct. 9055 if (Record) 9056 Record->setHasFlexibleArrayMember(true); 9057 } else if (!FDTy->isDependentType() && 9058 RequireCompleteType(FD->getLocation(), FD->getType(), 9059 diag::err_field_incomplete)) { 9060 // Incomplete type 9061 FD->setInvalidDecl(); 9062 EnclosingDecl->setInvalidDecl(); 9063 continue; 9064 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9065 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9066 // If this is a member of a union, then entire union becomes "flexible". 9067 if (Record && Record->isUnion()) { 9068 Record->setHasFlexibleArrayMember(true); 9069 } else { 9070 // If this is a struct/class and this is not the last element, reject 9071 // it. Note that GCC supports variable sized arrays in the middle of 9072 // structures. 9073 if (i + 1 != Fields.end()) 9074 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9075 << FD->getDeclName() << FD->getType(); 9076 else { 9077 // We support flexible arrays at the end of structs in 9078 // other structs as an extension. 9079 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9080 << FD->getDeclName(); 9081 if (Record) 9082 Record->setHasFlexibleArrayMember(true); 9083 } 9084 } 9085 } 9086 if (Record && FDTTy->getDecl()->hasObjectMember()) 9087 Record->setHasObjectMember(true); 9088 } else if (FDTy->isObjCObjectType()) { 9089 /// A field cannot be an Objective-c object 9090 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9091 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9092 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9093 FD->setType(T); 9094 } 9095 else if (!getLangOptions().CPlusPlus) { 9096 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9097 // It's an error in ARC if a field has lifetime. 9098 // We don't want to report this in a system header, though, 9099 // so we just make the field unavailable. 9100 // FIXME: that's really not sufficient; we need to make the type 9101 // itself invalid to, say, initialize or copy. 9102 QualType T = FD->getType(); 9103 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9104 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9105 SourceLocation loc = FD->getLocation(); 9106 if (getSourceManager().isInSystemHeader(loc)) { 9107 if (!FD->hasAttr<UnavailableAttr>()) { 9108 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9109 "this system field has retaining ownership")); 9110 } 9111 } else { 9112 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9113 } 9114 ARCErrReported = true; 9115 } 9116 } 9117 else if (getLangOptions().ObjC1 && 9118 getLangOptions().getGC() != LangOptions::NonGC && 9119 Record && !Record->hasObjectMember()) { 9120 if (FD->getType()->isObjCObjectPointerType() || 9121 FD->getType().isObjCGCStrong()) 9122 Record->setHasObjectMember(true); 9123 else if (Context.getAsArrayType(FD->getType())) { 9124 QualType BaseType = Context.getBaseElementType(FD->getType()); 9125 if (BaseType->isRecordType() && 9126 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9127 Record->setHasObjectMember(true); 9128 else if (BaseType->isObjCObjectPointerType() || 9129 BaseType.isObjCGCStrong()) 9130 Record->setHasObjectMember(true); 9131 } 9132 } 9133 } 9134 // Keep track of the number of named members. 9135 if (FD->getIdentifier()) 9136 ++NumNamedMembers; 9137 } 9138 9139 // Okay, we successfully defined 'Record'. 9140 if (Record) { 9141 bool Completed = false; 9142 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9143 if (!CXXRecord->isInvalidDecl()) { 9144 // Set access bits correctly on the directly-declared conversions. 9145 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9146 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9147 I != E; ++I) 9148 Convs->setAccess(I, (*I)->getAccess()); 9149 9150 if (!CXXRecord->isDependentType()) { 9151 // Objective-C Automatic Reference Counting: 9152 // If a class has a non-static data member of Objective-C pointer 9153 // type (or array thereof), it is a non-POD type and its 9154 // default constructor (if any), copy constructor, copy assignment 9155 // operator, and destructor are non-trivial. 9156 // 9157 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9158 // However, here we check whether this particular class is only 9159 // non-POD because of the presence of an Objective-C pointer member. 9160 // If so, objects of this type cannot be shared between code compiled 9161 // with instant objects and code compiled with manual retain/release. 9162 if (getLangOptions().ObjCAutoRefCount && 9163 CXXRecord->hasObjectMember() && 9164 CXXRecord->getLinkage() == ExternalLinkage) { 9165 if (CXXRecord->isPOD()) { 9166 Diag(CXXRecord->getLocation(), 9167 diag::warn_arc_non_pod_class_with_object_member) 9168 << CXXRecord; 9169 } else { 9170 // FIXME: Fix-Its would be nice here, but finding a good location 9171 // for them is going to be tricky. 9172 if (CXXRecord->hasTrivialCopyConstructor()) 9173 Diag(CXXRecord->getLocation(), 9174 diag::warn_arc_trivial_member_function_with_object_member) 9175 << CXXRecord << 0; 9176 if (CXXRecord->hasTrivialCopyAssignment()) 9177 Diag(CXXRecord->getLocation(), 9178 diag::warn_arc_trivial_member_function_with_object_member) 9179 << CXXRecord << 1; 9180 if (CXXRecord->hasTrivialDestructor()) 9181 Diag(CXXRecord->getLocation(), 9182 diag::warn_arc_trivial_member_function_with_object_member) 9183 << CXXRecord << 2; 9184 } 9185 } 9186 9187 // Adjust user-defined destructor exception spec. 9188 if (getLangOptions().CPlusPlus0x && 9189 CXXRecord->hasUserDeclaredDestructor()) 9190 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9191 9192 // Add any implicitly-declared members to this class. 9193 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9194 9195 // If we have virtual base classes, we may end up finding multiple 9196 // final overriders for a given virtual function. Check for this 9197 // problem now. 9198 if (CXXRecord->getNumVBases()) { 9199 CXXFinalOverriderMap FinalOverriders; 9200 CXXRecord->getFinalOverriders(FinalOverriders); 9201 9202 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9203 MEnd = FinalOverriders.end(); 9204 M != MEnd; ++M) { 9205 for (OverridingMethods::iterator SO = M->second.begin(), 9206 SOEnd = M->second.end(); 9207 SO != SOEnd; ++SO) { 9208 assert(SO->second.size() > 0 && 9209 "Virtual function without overridding functions?"); 9210 if (SO->second.size() == 1) 9211 continue; 9212 9213 // C++ [class.virtual]p2: 9214 // In a derived class, if a virtual member function of a base 9215 // class subobject has more than one final overrider the 9216 // program is ill-formed. 9217 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9218 << (NamedDecl *)M->first << Record; 9219 Diag(M->first->getLocation(), 9220 diag::note_overridden_virtual_function); 9221 for (OverridingMethods::overriding_iterator 9222 OM = SO->second.begin(), 9223 OMEnd = SO->second.end(); 9224 OM != OMEnd; ++OM) 9225 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9226 << (NamedDecl *)M->first << OM->Method->getParent(); 9227 9228 Record->setInvalidDecl(); 9229 } 9230 } 9231 CXXRecord->completeDefinition(&FinalOverriders); 9232 Completed = true; 9233 } 9234 } 9235 } 9236 } 9237 9238 if (!Completed) 9239 Record->completeDefinition(); 9240 9241 // Now that the record is complete, do any delayed exception spec checks 9242 // we were missing. 9243 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9244 const CXXDestructorDecl *Dtor = 9245 DelayedDestructorExceptionSpecChecks.back().first; 9246 if (Dtor->getParent() != Record) 9247 break; 9248 9249 assert(!Dtor->getParent()->isDependentType() && 9250 "Should not ever add destructors of templates into the list."); 9251 CheckOverridingFunctionExceptionSpec(Dtor, 9252 DelayedDestructorExceptionSpecChecks.back().second); 9253 DelayedDestructorExceptionSpecChecks.pop_back(); 9254 } 9255 9256 } else { 9257 ObjCIvarDecl **ClsFields = 9258 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9259 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9260 ID->setLocEnd(RBrac); 9261 // Add ivar's to class's DeclContext. 9262 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9263 ClsFields[i]->setLexicalDeclContext(ID); 9264 ID->addDecl(ClsFields[i]); 9265 } 9266 // Must enforce the rule that ivars in the base classes may not be 9267 // duplicates. 9268 if (ID->getSuperClass()) 9269 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9270 } else if (ObjCImplementationDecl *IMPDecl = 9271 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9272 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9273 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9274 // Ivar declared in @implementation never belongs to the implementation. 9275 // Only it is in implementation's lexical context. 9276 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9277 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9278 } else if (ObjCCategoryDecl *CDecl = 9279 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9280 // case of ivars in class extension; all other cases have been 9281 // reported as errors elsewhere. 9282 // FIXME. Class extension does not have a LocEnd field. 9283 // CDecl->setLocEnd(RBrac); 9284 // Add ivar's to class extension's DeclContext. 9285 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9286 ClsFields[i]->setLexicalDeclContext(CDecl); 9287 CDecl->addDecl(ClsFields[i]); 9288 } 9289 } 9290 } 9291 9292 if (Attr) 9293 ProcessDeclAttributeList(S, Record, Attr); 9294 9295 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9296 // set the visibility of this record. 9297 if (Record && !Record->getDeclContext()->isRecord()) 9298 AddPushedVisibilityAttribute(Record); 9299} 9300 9301/// \brief Determine whether the given integral value is representable within 9302/// the given type T. 9303static bool isRepresentableIntegerValue(ASTContext &Context, 9304 llvm::APSInt &Value, 9305 QualType T) { 9306 assert(T->isIntegralType(Context) && "Integral type required!"); 9307 unsigned BitWidth = Context.getIntWidth(T); 9308 9309 if (Value.isUnsigned() || Value.isNonNegative()) { 9310 if (T->isSignedIntegerOrEnumerationType()) 9311 --BitWidth; 9312 return Value.getActiveBits() <= BitWidth; 9313 } 9314 return Value.getMinSignedBits() <= BitWidth; 9315} 9316 9317// \brief Given an integral type, return the next larger integral type 9318// (or a NULL type of no such type exists). 9319static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9320 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9321 // enum checking below. 9322 assert(T->isIntegralType(Context) && "Integral type required!"); 9323 const unsigned NumTypes = 4; 9324 QualType SignedIntegralTypes[NumTypes] = { 9325 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9326 }; 9327 QualType UnsignedIntegralTypes[NumTypes] = { 9328 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9329 Context.UnsignedLongLongTy 9330 }; 9331 9332 unsigned BitWidth = Context.getTypeSize(T); 9333 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9334 : UnsignedIntegralTypes; 9335 for (unsigned I = 0; I != NumTypes; ++I) 9336 if (Context.getTypeSize(Types[I]) > BitWidth) 9337 return Types[I]; 9338 9339 return QualType(); 9340} 9341 9342EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9343 EnumConstantDecl *LastEnumConst, 9344 SourceLocation IdLoc, 9345 IdentifierInfo *Id, 9346 Expr *Val) { 9347 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9348 llvm::APSInt EnumVal(IntWidth); 9349 QualType EltTy; 9350 9351 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9352 Val = 0; 9353 9354 if (Val) { 9355 if (Enum->isDependentType() || Val->isTypeDependent()) 9356 EltTy = Context.DependentTy; 9357 else { 9358 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9359 SourceLocation ExpLoc; 9360 if (!Val->isValueDependent() && 9361 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9362 Val = 0; 9363 } else { 9364 if (!getLangOptions().CPlusPlus) { 9365 // C99 6.7.2.2p2: 9366 // The expression that defines the value of an enumeration constant 9367 // shall be an integer constant expression that has a value 9368 // representable as an int. 9369 9370 // Complain if the value is not representable in an int. 9371 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9372 Diag(IdLoc, diag::ext_enum_value_not_int) 9373 << EnumVal.toString(10) << Val->getSourceRange() 9374 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9375 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9376 // Force the type of the expression to 'int'. 9377 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9378 } 9379 } 9380 9381 if (Enum->isFixed()) { 9382 EltTy = Enum->getIntegerType(); 9383 9384 // C++0x [dcl.enum]p5: 9385 // ... if the initializing value of an enumerator cannot be 9386 // represented by the underlying type, the program is ill-formed. 9387 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9388 if (getLangOptions().MicrosoftExt) { 9389 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9390 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9391 } else 9392 Diag(IdLoc, diag::err_enumerator_too_large) 9393 << EltTy; 9394 } else 9395 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9396 } 9397 else { 9398 // C++0x [dcl.enum]p5: 9399 // If the underlying type is not fixed, the type of each enumerator 9400 // is the type of its initializing value: 9401 // - If an initializer is specified for an enumerator, the 9402 // initializing value has the same type as the expression. 9403 EltTy = Val->getType(); 9404 } 9405 } 9406 } 9407 } 9408 9409 if (!Val) { 9410 if (Enum->isDependentType()) 9411 EltTy = Context.DependentTy; 9412 else if (!LastEnumConst) { 9413 // C++0x [dcl.enum]p5: 9414 // If the underlying type is not fixed, the type of each enumerator 9415 // is the type of its initializing value: 9416 // - If no initializer is specified for the first enumerator, the 9417 // initializing value has an unspecified integral type. 9418 // 9419 // GCC uses 'int' for its unspecified integral type, as does 9420 // C99 6.7.2.2p3. 9421 if (Enum->isFixed()) { 9422 EltTy = Enum->getIntegerType(); 9423 } 9424 else { 9425 EltTy = Context.IntTy; 9426 } 9427 } else { 9428 // Assign the last value + 1. 9429 EnumVal = LastEnumConst->getInitVal(); 9430 ++EnumVal; 9431 EltTy = LastEnumConst->getType(); 9432 9433 // Check for overflow on increment. 9434 if (EnumVal < LastEnumConst->getInitVal()) { 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 // 9439 // - Otherwise the type of the initializing value is the same as 9440 // the type of the initializing value of the preceding enumerator 9441 // unless the incremented value is not representable in that type, 9442 // in which case the type is an unspecified integral type 9443 // sufficient to contain the incremented value. If no such type 9444 // exists, the program is ill-formed. 9445 QualType T = getNextLargerIntegralType(Context, EltTy); 9446 if (T.isNull() || Enum->isFixed()) { 9447 // There is no integral type larger enough to represent this 9448 // value. Complain, then allow the value to wrap around. 9449 EnumVal = LastEnumConst->getInitVal(); 9450 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9451 ++EnumVal; 9452 if (Enum->isFixed()) 9453 // When the underlying type is fixed, this is ill-formed. 9454 Diag(IdLoc, diag::err_enumerator_wrapped) 9455 << EnumVal.toString(10) 9456 << EltTy; 9457 else 9458 Diag(IdLoc, diag::warn_enumerator_too_large) 9459 << EnumVal.toString(10); 9460 } else { 9461 EltTy = T; 9462 } 9463 9464 // Retrieve the last enumerator's value, extent that type to the 9465 // type that is supposed to be large enough to represent the incremented 9466 // value, then increment. 9467 EnumVal = LastEnumConst->getInitVal(); 9468 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9469 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9470 ++EnumVal; 9471 9472 // If we're not in C++, diagnose the overflow of enumerator values, 9473 // which in C99 means that the enumerator value is not representable in 9474 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9475 // permits enumerator values that are representable in some larger 9476 // integral type. 9477 if (!getLangOptions().CPlusPlus && !T.isNull()) 9478 Diag(IdLoc, diag::warn_enum_value_overflow); 9479 } else if (!getLangOptions().CPlusPlus && 9480 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9481 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9482 Diag(IdLoc, diag::ext_enum_value_not_int) 9483 << EnumVal.toString(10) << 1; 9484 } 9485 } 9486 } 9487 9488 if (!EltTy->isDependentType()) { 9489 // Make the enumerator value match the signedness and size of the 9490 // enumerator's type. 9491 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9492 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9493 } 9494 9495 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9496 Val, EnumVal); 9497} 9498 9499 9500Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9501 SourceLocation IdLoc, IdentifierInfo *Id, 9502 AttributeList *Attr, 9503 SourceLocation EqualLoc, Expr *val) { 9504 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9505 EnumConstantDecl *LastEnumConst = 9506 cast_or_null<EnumConstantDecl>(lastEnumConst); 9507 Expr *Val = static_cast<Expr*>(val); 9508 9509 // The scope passed in may not be a decl scope. Zip up the scope tree until 9510 // we find one that is. 9511 S = getNonFieldDeclScope(S); 9512 9513 // Verify that there isn't already something declared with this name in this 9514 // scope. 9515 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9516 ForRedeclaration); 9517 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9518 // Maybe we will complain about the shadowed template parameter. 9519 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9520 // Just pretend that we didn't see the previous declaration. 9521 PrevDecl = 0; 9522 } 9523 9524 if (PrevDecl) { 9525 // When in C++, we may get a TagDecl with the same name; in this case the 9526 // enum constant will 'hide' the tag. 9527 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9528 "Received TagDecl when not in C++!"); 9529 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9530 if (isa<EnumConstantDecl>(PrevDecl)) 9531 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9532 else 9533 Diag(IdLoc, diag::err_redefinition) << Id; 9534 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9535 return 0; 9536 } 9537 } 9538 9539 // C++ [class.mem]p13: 9540 // If T is the name of a class, then each of the following shall have a 9541 // name different from T: 9542 // - every enumerator of every member of class T that is an enumerated 9543 // type 9544 if (CXXRecordDecl *Record 9545 = dyn_cast<CXXRecordDecl>( 9546 TheEnumDecl->getDeclContext()->getRedeclContext())) 9547 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9548 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9549 9550 EnumConstantDecl *New = 9551 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9552 9553 if (New) { 9554 // Process attributes. 9555 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9556 9557 // Register this decl in the current scope stack. 9558 New->setAccess(TheEnumDecl->getAccess()); 9559 PushOnScopeChains(New, S); 9560 } 9561 9562 return New; 9563} 9564 9565void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9566 SourceLocation RBraceLoc, Decl *EnumDeclX, 9567 Decl **Elements, unsigned NumElements, 9568 Scope *S, AttributeList *Attr) { 9569 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9570 QualType EnumType = Context.getTypeDeclType(Enum); 9571 9572 if (Attr) 9573 ProcessDeclAttributeList(S, Enum, Attr); 9574 9575 if (Enum->isDependentType()) { 9576 for (unsigned i = 0; i != NumElements; ++i) { 9577 EnumConstantDecl *ECD = 9578 cast_or_null<EnumConstantDecl>(Elements[i]); 9579 if (!ECD) continue; 9580 9581 ECD->setType(EnumType); 9582 } 9583 9584 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9585 return; 9586 } 9587 9588 // TODO: If the result value doesn't fit in an int, it must be a long or long 9589 // long value. ISO C does not support this, but GCC does as an extension, 9590 // emit a warning. 9591 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9592 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9593 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9594 9595 // Verify that all the values are okay, compute the size of the values, and 9596 // reverse the list. 9597 unsigned NumNegativeBits = 0; 9598 unsigned NumPositiveBits = 0; 9599 9600 // Keep track of whether all elements have type int. 9601 bool AllElementsInt = true; 9602 9603 for (unsigned i = 0; i != NumElements; ++i) { 9604 EnumConstantDecl *ECD = 9605 cast_or_null<EnumConstantDecl>(Elements[i]); 9606 if (!ECD) continue; // Already issued a diagnostic. 9607 9608 const llvm::APSInt &InitVal = ECD->getInitVal(); 9609 9610 // Keep track of the size of positive and negative values. 9611 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9612 NumPositiveBits = std::max(NumPositiveBits, 9613 (unsigned)InitVal.getActiveBits()); 9614 else 9615 NumNegativeBits = std::max(NumNegativeBits, 9616 (unsigned)InitVal.getMinSignedBits()); 9617 9618 // Keep track of whether every enum element has type int (very commmon). 9619 if (AllElementsInt) 9620 AllElementsInt = ECD->getType() == Context.IntTy; 9621 } 9622 9623 // Figure out the type that should be used for this enum. 9624 QualType BestType; 9625 unsigned BestWidth; 9626 9627 // C++0x N3000 [conv.prom]p3: 9628 // An rvalue of an unscoped enumeration type whose underlying 9629 // type is not fixed can be converted to an rvalue of the first 9630 // of the following types that can represent all the values of 9631 // the enumeration: int, unsigned int, long int, unsigned long 9632 // int, long long int, or unsigned long long int. 9633 // C99 6.4.4.3p2: 9634 // An identifier declared as an enumeration constant has type int. 9635 // The C99 rule is modified by a gcc extension 9636 QualType BestPromotionType; 9637 9638 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9639 // -fshort-enums is the equivalent to specifying the packed attribute on all 9640 // enum definitions. 9641 if (LangOpts.ShortEnums) 9642 Packed = true; 9643 9644 if (Enum->isFixed()) { 9645 BestType = BestPromotionType = Enum->getIntegerType(); 9646 // We don't need to set BestWidth, because BestType is going to be the type 9647 // of the enumerators, but we do anyway because otherwise some compilers 9648 // warn that it might be used uninitialized. 9649 BestWidth = CharWidth; 9650 } 9651 else if (NumNegativeBits) { 9652 // If there is a negative value, figure out the smallest integer type (of 9653 // int/long/longlong) that fits. 9654 // If it's packed, check also if it fits a char or a short. 9655 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9656 BestType = Context.SignedCharTy; 9657 BestWidth = CharWidth; 9658 } else if (Packed && NumNegativeBits <= ShortWidth && 9659 NumPositiveBits < ShortWidth) { 9660 BestType = Context.ShortTy; 9661 BestWidth = ShortWidth; 9662 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9663 BestType = Context.IntTy; 9664 BestWidth = IntWidth; 9665 } else { 9666 BestWidth = Context.getTargetInfo().getLongWidth(); 9667 9668 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9669 BestType = Context.LongTy; 9670 } else { 9671 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9672 9673 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9674 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9675 BestType = Context.LongLongTy; 9676 } 9677 } 9678 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9679 } else { 9680 // If there is no negative value, figure out the smallest type that fits 9681 // all of the enumerator values. 9682 // If it's packed, check also if it fits a char or a short. 9683 if (Packed && NumPositiveBits <= CharWidth) { 9684 BestType = Context.UnsignedCharTy; 9685 BestPromotionType = Context.IntTy; 9686 BestWidth = CharWidth; 9687 } else if (Packed && NumPositiveBits <= ShortWidth) { 9688 BestType = Context.UnsignedShortTy; 9689 BestPromotionType = Context.IntTy; 9690 BestWidth = ShortWidth; 9691 } else if (NumPositiveBits <= IntWidth) { 9692 BestType = Context.UnsignedIntTy; 9693 BestWidth = IntWidth; 9694 BestPromotionType 9695 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9696 ? Context.UnsignedIntTy : Context.IntTy; 9697 } else if (NumPositiveBits <= 9698 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9699 BestType = Context.UnsignedLongTy; 9700 BestPromotionType 9701 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9702 ? Context.UnsignedLongTy : Context.LongTy; 9703 } else { 9704 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9705 assert(NumPositiveBits <= BestWidth && 9706 "How could an initializer get larger than ULL?"); 9707 BestType = Context.UnsignedLongLongTy; 9708 BestPromotionType 9709 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9710 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9711 } 9712 } 9713 9714 // Loop over all of the enumerator constants, changing their types to match 9715 // the type of the enum if needed. 9716 for (unsigned i = 0; i != NumElements; ++i) { 9717 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9718 if (!ECD) continue; // Already issued a diagnostic. 9719 9720 // Standard C says the enumerators have int type, but we allow, as an 9721 // extension, the enumerators to be larger than int size. If each 9722 // enumerator value fits in an int, type it as an int, otherwise type it the 9723 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9724 // that X has type 'int', not 'unsigned'. 9725 9726 // Determine whether the value fits into an int. 9727 llvm::APSInt InitVal = ECD->getInitVal(); 9728 9729 // If it fits into an integer type, force it. Otherwise force it to match 9730 // the enum decl type. 9731 QualType NewTy; 9732 unsigned NewWidth; 9733 bool NewSign; 9734 if (!getLangOptions().CPlusPlus && 9735 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9736 NewTy = Context.IntTy; 9737 NewWidth = IntWidth; 9738 NewSign = true; 9739 } else if (ECD->getType() == BestType) { 9740 // Already the right type! 9741 if (getLangOptions().CPlusPlus) 9742 // C++ [dcl.enum]p4: Following the closing brace of an 9743 // enum-specifier, each enumerator has the type of its 9744 // enumeration. 9745 ECD->setType(EnumType); 9746 continue; 9747 } else { 9748 NewTy = BestType; 9749 NewWidth = BestWidth; 9750 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9751 } 9752 9753 // Adjust the APSInt value. 9754 InitVal = InitVal.extOrTrunc(NewWidth); 9755 InitVal.setIsSigned(NewSign); 9756 ECD->setInitVal(InitVal); 9757 9758 // Adjust the Expr initializer and type. 9759 if (ECD->getInitExpr() && 9760 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9761 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9762 CK_IntegralCast, 9763 ECD->getInitExpr(), 9764 /*base paths*/ 0, 9765 VK_RValue)); 9766 if (getLangOptions().CPlusPlus) 9767 // C++ [dcl.enum]p4: Following the closing brace of an 9768 // enum-specifier, each enumerator has the type of its 9769 // enumeration. 9770 ECD->setType(EnumType); 9771 else 9772 ECD->setType(NewTy); 9773 } 9774 9775 Enum->completeDefinition(BestType, BestPromotionType, 9776 NumPositiveBits, NumNegativeBits); 9777} 9778 9779Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9780 SourceLocation StartLoc, 9781 SourceLocation EndLoc) { 9782 StringLiteral *AsmString = cast<StringLiteral>(expr); 9783 9784 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9785 AsmString, StartLoc, 9786 EndLoc); 9787 CurContext->addDecl(New); 9788 return New; 9789} 9790 9791DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9792 IdentifierInfo &ModuleName, 9793 SourceLocation ModuleNameLoc) { 9794 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9795 ModuleName, ModuleNameLoc); 9796 if (!Module) 9797 return true; 9798 9799 // FIXME: Actually create a declaration to describe the module import. 9800 (void)Module; 9801 return DeclResult((Decl *)0); 9802} 9803 9804void 9805Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9806 SourceLocation ModulePrivateKeyword) { 9807 assert(!Old->isModulePrivate() && "Old is module-private!"); 9808 9809 Diag(New->getLocation(), diag::err_module_private_follows_public) 9810 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9811 Diag(Old->getLocation(), diag::note_previous_declaration) 9812 << Old->getDeclName(); 9813 9814 // Drop the __module_private__ from the new declaration, since it's invalid. 9815 New->setModulePrivate(false); 9816} 9817 9818void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9819 SourceLocation PragmaLoc, 9820 SourceLocation NameLoc) { 9821 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9822 9823 if (PrevDecl) { 9824 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9825 } else { 9826 (void)WeakUndeclaredIdentifiers.insert( 9827 std::pair<IdentifierInfo*,WeakInfo> 9828 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9829 } 9830} 9831 9832void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9833 IdentifierInfo* AliasName, 9834 SourceLocation PragmaLoc, 9835 SourceLocation NameLoc, 9836 SourceLocation AliasNameLoc) { 9837 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9838 LookupOrdinaryName); 9839 WeakInfo W = WeakInfo(Name, NameLoc); 9840 9841 if (PrevDecl) { 9842 if (!PrevDecl->hasAttr<AliasAttr>()) 9843 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9844 DeclApplyPragmaWeak(TUScope, ND, W); 9845 } else { 9846 (void)WeakUndeclaredIdentifiers.insert( 9847 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9848 } 9849} 9850 9851Decl *Sema::getObjCDeclContext() const { 9852 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9853} 9854 9855AvailabilityResult Sema::getCurContextAvailability() const { 9856 const Decl *D = cast<Decl>(getCurLexicalContext()); 9857 // A category implicitly has the availability of the interface. 9858 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9859 D = CatD->getClassInterface(); 9860 9861 return D->getAvailability(); 9862} 9863