SemaDecl.cpp revision e2d4f4ed44a32f179c6d48cd1dba8346ab2129d9
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo, 75 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 421 .get(); 422 } else { 423 assert(SS && SS->isInvalid() && 424 "Invalid scope specifier has already been diagnosed"); 425 } 426 427 return true; 428} 429 430/// \brief Determine whether the given result set contains either a type name 431/// or 432static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 433 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 434 NextToken.is(tok::less); 435 436 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 437 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 438 return true; 439 440 if (CheckTemplate && isa<TemplateDecl>(*I)) 441 return true; 442 } 443 444 return false; 445} 446 447Sema::NameClassification Sema::ClassifyName(Scope *S, 448 CXXScopeSpec &SS, 449 IdentifierInfo *&Name, 450 SourceLocation NameLoc, 451 const Token &NextToken) { 452 DeclarationNameInfo NameInfo(Name, NameLoc); 453 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 454 455 if (NextToken.is(tok::coloncolon)) { 456 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 457 QualType(), false, SS, 0, false); 458 459 } 460 461 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 462 LookupParsedName(Result, S, &SS, !CurMethod); 463 464 // Perform lookup for Objective-C instance variables (including automatically 465 // synthesized instance variables), if we're in an Objective-C method. 466 // FIXME: This lookup really, really needs to be folded in to the normal 467 // unqualified lookup mechanism. 468 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 469 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 470 if (E.get() || E.isInvalid()) 471 return E; 472 } 473 474 bool SecondTry = false; 475 bool IsFilteredTemplateName = false; 476 477Corrected: 478 switch (Result.getResultKind()) { 479 case LookupResult::NotFound: 480 // If an unqualified-id is followed by a '(', then we have a function 481 // call. 482 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 483 // In C++, this is an ADL-only call. 484 // FIXME: Reference? 485 if (getLangOptions().CPlusPlus) 486 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 487 488 // C90 6.3.2.2: 489 // If the expression that precedes the parenthesized argument list in a 490 // function call consists solely of an identifier, and if no 491 // declaration is visible for this identifier, the identifier is 492 // implicitly declared exactly as if, in the innermost block containing 493 // the function call, the declaration 494 // 495 // extern int identifier (); 496 // 497 // appeared. 498 // 499 // We also allow this in C99 as an extension. 500 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 501 Result.addDecl(D); 502 Result.resolveKind(); 503 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 504 } 505 } 506 507 // In C, we first see whether there is a tag type by the same name, in 508 // which case it's likely that the user just forget to write "enum", 509 // "struct", or "union". 510 if (!getLangOptions().CPlusPlus && !SecondTry) { 511 Result.clear(LookupTagName); 512 LookupParsedName(Result, S, &SS); 513 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 514 const char *TagName = 0; 515 const char *FixItTagName = 0; 516 switch (Tag->getTagKind()) { 517 case TTK_Class: 518 TagName = "class"; 519 FixItTagName = "class "; 520 break; 521 522 case TTK_Enum: 523 TagName = "enum"; 524 FixItTagName = "enum "; 525 break; 526 527 case TTK_Struct: 528 TagName = "struct"; 529 FixItTagName = "struct "; 530 break; 531 532 case TTK_Union: 533 TagName = "union"; 534 FixItTagName = "union "; 535 break; 536 } 537 538 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 539 << Name << TagName << getLangOptions().CPlusPlus 540 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 541 break; 542 } 543 544 Result.clear(LookupOrdinaryName); 545 } 546 547 // Perform typo correction to determine if there is another name that is 548 // close to this name. 549 if (!SecondTry) { 550 SecondTry = true; 551 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 552 Result.getLookupKind(), S, 553 &SS)) { 554 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 555 unsigned QualifiedDiag = diag::err_no_member_suggest; 556 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 557 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 558 559 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 560 NamedDecl *UnderlyingFirstDecl 561 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 562 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 563 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 564 UnqualifiedDiag = diag::err_no_template_suggest; 565 QualifiedDiag = diag::err_no_member_template_suggest; 566 } else if (UnderlyingFirstDecl && 567 (isa<TypeDecl>(UnderlyingFirstDecl) || 568 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 569 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 570 UnqualifiedDiag = diag::err_unknown_typename_suggest; 571 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 572 } 573 574 if (SS.isEmpty()) 575 Diag(NameLoc, UnqualifiedDiag) 576 << Name << CorrectedQuotedStr 577 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 578 else 579 Diag(NameLoc, QualifiedDiag) 580 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 581 << SS.getRange() 582 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 583 584 // Update the name, so that the caller has the new name. 585 Name = Corrected.getCorrectionAsIdentifierInfo(); 586 587 // Also update the LookupResult... 588 // FIXME: This should probably go away at some point 589 Result.clear(); 590 Result.setLookupName(Corrected.getCorrection()); 591 if (FirstDecl) Result.addDecl(FirstDecl); 592 593 // Typo correction corrected to a keyword. 594 if (Corrected.isKeyword()) 595 return Corrected.getCorrectionAsIdentifierInfo(); 596 597 if (FirstDecl) 598 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 599 << CorrectedQuotedStr; 600 601 // If we found an Objective-C instance variable, let 602 // LookupInObjCMethod build the appropriate expression to 603 // reference the ivar. 604 // FIXME: This is a gross hack. 605 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 606 Result.clear(); 607 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 608 return move(E); 609 } 610 611 goto Corrected; 612 } 613 } 614 615 // We failed to correct; just fall through and let the parser deal with it. 616 Result.suppressDiagnostics(); 617 return NameClassification::Unknown(); 618 619 case LookupResult::NotFoundInCurrentInstantiation: 620 // We performed name lookup into the current instantiation, and there were 621 // dependent bases, so we treat this result the same way as any other 622 // dependent nested-name-specifier. 623 624 // C++ [temp.res]p2: 625 // A name used in a template declaration or definition and that is 626 // dependent on a template-parameter is assumed not to name a type 627 // unless the applicable name lookup finds a type name or the name is 628 // qualified by the keyword typename. 629 // 630 // FIXME: If the next token is '<', we might want to ask the parser to 631 // perform some heroics to see if we actually have a 632 // template-argument-list, which would indicate a missing 'template' 633 // keyword here. 634 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 635 636 case LookupResult::Found: 637 case LookupResult::FoundOverloaded: 638 case LookupResult::FoundUnresolvedValue: 639 break; 640 641 case LookupResult::Ambiguous: 642 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 643 hasAnyAcceptableTemplateNames(Result)) { 644 // C++ [temp.local]p3: 645 // A lookup that finds an injected-class-name (10.2) can result in an 646 // ambiguity in certain cases (for example, if it is found in more than 647 // one base class). If all of the injected-class-names that are found 648 // refer to specializations of the same class template, and if the name 649 // is followed by a template-argument-list, the reference refers to the 650 // class template itself and not a specialization thereof, and is not 651 // ambiguous. 652 // 653 // This filtering can make an ambiguous result into an unambiguous one, 654 // so try again after filtering out template names. 655 FilterAcceptableTemplateNames(Result); 656 if (!Result.isAmbiguous()) { 657 IsFilteredTemplateName = true; 658 break; 659 } 660 } 661 662 // Diagnose the ambiguity and return an error. 663 return NameClassification::Error(); 664 } 665 666 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 667 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 668 // C++ [temp.names]p3: 669 // After name lookup (3.4) finds that a name is a template-name or that 670 // an operator-function-id or a literal- operator-id refers to a set of 671 // overloaded functions any member of which is a function template if 672 // this is followed by a <, the < is always taken as the delimiter of a 673 // template-argument-list and never as the less-than operator. 674 if (!IsFilteredTemplateName) 675 FilterAcceptableTemplateNames(Result); 676 677 if (!Result.empty()) { 678 bool IsFunctionTemplate; 679 TemplateName Template; 680 if (Result.end() - Result.begin() > 1) { 681 IsFunctionTemplate = true; 682 Template = Context.getOverloadedTemplateName(Result.begin(), 683 Result.end()); 684 } else { 685 TemplateDecl *TD 686 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 687 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 688 689 if (SS.isSet() && !SS.isInvalid()) 690 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 691 /*TemplateKeyword=*/false, 692 TD); 693 else 694 Template = TemplateName(TD); 695 } 696 697 if (IsFunctionTemplate) { 698 // Function templates always go through overload resolution, at which 699 // point we'll perform the various checks (e.g., accessibility) we need 700 // to based on which function we selected. 701 Result.suppressDiagnostics(); 702 703 return NameClassification::FunctionTemplate(Template); 704 } 705 706 return NameClassification::TypeTemplate(Template); 707 } 708 } 709 710 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 711 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 712 DiagnoseUseOfDecl(Type, NameLoc); 713 QualType T = Context.getTypeDeclType(Type); 714 return ParsedType::make(T); 715 } 716 717 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 718 if (!Class) { 719 // FIXME: It's unfortunate that we don't have a Type node for handling this. 720 if (ObjCCompatibleAliasDecl *Alias 721 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 722 Class = Alias->getClassInterface(); 723 } 724 725 if (Class) { 726 DiagnoseUseOfDecl(Class, NameLoc); 727 728 if (NextToken.is(tok::period)) { 729 // Interface. <something> is parsed as a property reference expression. 730 // Just return "unknown" as a fall-through for now. 731 Result.suppressDiagnostics(); 732 return NameClassification::Unknown(); 733 } 734 735 QualType T = Context.getObjCInterfaceType(Class); 736 return ParsedType::make(T); 737 } 738 739 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 740 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 741 742 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 743 return BuildDeclarationNameExpr(SS, Result, ADL); 744} 745 746// Determines the context to return to after temporarily entering a 747// context. This depends in an unnecessarily complicated way on the 748// exact ordering of callbacks from the parser. 749DeclContext *Sema::getContainingDC(DeclContext *DC) { 750 751 // Functions defined inline within classes aren't parsed until we've 752 // finished parsing the top-level class, so the top-level class is 753 // the context we'll need to return to. 754 if (isa<FunctionDecl>(DC)) { 755 DC = DC->getLexicalParent(); 756 757 // A function not defined within a class will always return to its 758 // lexical context. 759 if (!isa<CXXRecordDecl>(DC)) 760 return DC; 761 762 // A C++ inline method/friend is parsed *after* the topmost class 763 // it was declared in is fully parsed ("complete"); the topmost 764 // class is the context we need to return to. 765 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 766 DC = RD; 767 768 // Return the declaration context of the topmost class the inline method is 769 // declared in. 770 return DC; 771 } 772 773 return DC->getLexicalParent(); 774} 775 776void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 777 assert(getContainingDC(DC) == CurContext && 778 "The next DeclContext should be lexically contained in the current one."); 779 CurContext = DC; 780 S->setEntity(DC); 781} 782 783void Sema::PopDeclContext() { 784 assert(CurContext && "DeclContext imbalance!"); 785 786 CurContext = getContainingDC(CurContext); 787 assert(CurContext && "Popped translation unit!"); 788} 789 790/// EnterDeclaratorContext - Used when we must lookup names in the context 791/// of a declarator's nested name specifier. 792/// 793void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 794 // C++0x [basic.lookup.unqual]p13: 795 // A name used in the definition of a static data member of class 796 // X (after the qualified-id of the static member) is looked up as 797 // if the name was used in a member function of X. 798 // C++0x [basic.lookup.unqual]p14: 799 // If a variable member of a namespace is defined outside of the 800 // scope of its namespace then any name used in the definition of 801 // the variable member (after the declarator-id) is looked up as 802 // if the definition of the variable member occurred in its 803 // namespace. 804 // Both of these imply that we should push a scope whose context 805 // is the semantic context of the declaration. We can't use 806 // PushDeclContext here because that context is not necessarily 807 // lexically contained in the current context. Fortunately, 808 // the containing scope should have the appropriate information. 809 810 assert(!S->getEntity() && "scope already has entity"); 811 812#ifndef NDEBUG 813 Scope *Ancestor = S->getParent(); 814 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 815 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 816#endif 817 818 CurContext = DC; 819 S->setEntity(DC); 820} 821 822void Sema::ExitDeclaratorContext(Scope *S) { 823 assert(S->getEntity() == CurContext && "Context imbalance!"); 824 825 // Switch back to the lexical context. The safety of this is 826 // enforced by an assert in EnterDeclaratorContext. 827 Scope *Ancestor = S->getParent(); 828 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 829 CurContext = (DeclContext*) Ancestor->getEntity(); 830 831 // We don't need to do anything with the scope, which is going to 832 // disappear. 833} 834 835 836void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 837 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 838 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 839 // We assume that the caller has already called 840 // ActOnReenterTemplateScope 841 FD = TFD->getTemplatedDecl(); 842 } 843 if (!FD) 844 return; 845 846 PushDeclContext(S, FD); 847 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 848 ParmVarDecl *Param = FD->getParamDecl(P); 849 // If the parameter has an identifier, then add it to the scope 850 if (Param->getIdentifier()) { 851 S->AddDecl(Param); 852 IdResolver.AddDecl(Param); 853 } 854 } 855} 856 857 858/// \brief Determine whether we allow overloading of the function 859/// PrevDecl with another declaration. 860/// 861/// This routine determines whether overloading is possible, not 862/// whether some new function is actually an overload. It will return 863/// true in C++ (where we can always provide overloads) or, as an 864/// extension, in C when the previous function is already an 865/// overloaded function declaration or has the "overloadable" 866/// attribute. 867static bool AllowOverloadingOfFunction(LookupResult &Previous, 868 ASTContext &Context) { 869 if (Context.getLangOptions().CPlusPlus) 870 return true; 871 872 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 873 return true; 874 875 return (Previous.getResultKind() == LookupResult::Found 876 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 877} 878 879/// Add this decl to the scope shadowed decl chains. 880void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 881 // Move up the scope chain until we find the nearest enclosing 882 // non-transparent context. The declaration will be introduced into this 883 // scope. 884 while (S->getEntity() && 885 ((DeclContext *)S->getEntity())->isTransparentContext()) 886 S = S->getParent(); 887 888 // Add scoped declarations into their context, so that they can be 889 // found later. Declarations without a context won't be inserted 890 // into any context. 891 if (AddToContext) 892 CurContext->addDecl(D); 893 894 // Out-of-line definitions shouldn't be pushed into scope in C++. 895 // Out-of-line variable and function definitions shouldn't even in C. 896 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 897 D->isOutOfLine() && 898 !D->getDeclContext()->getRedeclContext()->Equals( 899 D->getLexicalDeclContext()->getRedeclContext())) 900 return; 901 902 // Template instantiations should also not be pushed into scope. 903 if (isa<FunctionDecl>(D) && 904 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 905 return; 906 907 // If this replaces anything in the current scope, 908 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 909 IEnd = IdResolver.end(); 910 for (; I != IEnd; ++I) { 911 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 912 S->RemoveDecl(*I); 913 IdResolver.RemoveDecl(*I); 914 915 // Should only need to replace one decl. 916 break; 917 } 918 } 919 920 S->AddDecl(D); 921 922 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 923 // Implicitly-generated labels may end up getting generated in an order that 924 // isn't strictly lexical, which breaks name lookup. Be careful to insert 925 // the label at the appropriate place in the identifier chain. 926 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 927 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 928 if (IDC == CurContext) { 929 if (!S->isDeclScope(*I)) 930 continue; 931 } else if (IDC->Encloses(CurContext)) 932 break; 933 } 934 935 IdResolver.InsertDeclAfter(I, D); 936 } else { 937 IdResolver.AddDecl(D); 938 } 939} 940 941void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 942 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 943 TUScope->AddDecl(D); 944} 945 946bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 947 bool ExplicitInstantiationOrSpecialization) { 948 return IdResolver.isDeclInScope(D, Ctx, Context, S, 949 ExplicitInstantiationOrSpecialization); 950} 951 952Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 953 DeclContext *TargetDC = DC->getPrimaryContext(); 954 do { 955 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 956 if (ScopeDC->getPrimaryContext() == TargetDC) 957 return S; 958 } while ((S = S->getParent())); 959 960 return 0; 961} 962 963static bool isOutOfScopePreviousDeclaration(NamedDecl *, 964 DeclContext*, 965 ASTContext&); 966 967/// Filters out lookup results that don't fall within the given scope 968/// as determined by isDeclInScope. 969void Sema::FilterLookupForScope(LookupResult &R, 970 DeclContext *Ctx, Scope *S, 971 bool ConsiderLinkage, 972 bool ExplicitInstantiationOrSpecialization) { 973 LookupResult::Filter F = R.makeFilter(); 974 while (F.hasNext()) { 975 NamedDecl *D = F.next(); 976 977 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 978 continue; 979 980 if (ConsiderLinkage && 981 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 982 continue; 983 984 F.erase(); 985 } 986 987 F.done(); 988} 989 990static bool isUsingDecl(NamedDecl *D) { 991 return isa<UsingShadowDecl>(D) || 992 isa<UnresolvedUsingTypenameDecl>(D) || 993 isa<UnresolvedUsingValueDecl>(D); 994} 995 996/// Removes using shadow declarations from the lookup results. 997static void RemoveUsingDecls(LookupResult &R) { 998 LookupResult::Filter F = R.makeFilter(); 999 while (F.hasNext()) 1000 if (isUsingDecl(F.next())) 1001 F.erase(); 1002 1003 F.done(); 1004} 1005 1006/// \brief Check for this common pattern: 1007/// @code 1008/// class S { 1009/// S(const S&); // DO NOT IMPLEMENT 1010/// void operator=(const S&); // DO NOT IMPLEMENT 1011/// }; 1012/// @endcode 1013static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1014 // FIXME: Should check for private access too but access is set after we get 1015 // the decl here. 1016 if (D->doesThisDeclarationHaveABody()) 1017 return false; 1018 1019 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1020 return CD->isCopyConstructor(); 1021 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1022 return Method->isCopyAssignmentOperator(); 1023 return false; 1024} 1025 1026bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1027 assert(D); 1028 1029 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1030 return false; 1031 1032 // Ignore class templates. 1033 if (D->getDeclContext()->isDependentContext() || 1034 D->getLexicalDeclContext()->isDependentContext()) 1035 return false; 1036 1037 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1038 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1039 return false; 1040 1041 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1042 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1043 return false; 1044 } else { 1045 // 'static inline' functions are used in headers; don't warn. 1046 if (FD->getStorageClass() == SC_Static && 1047 FD->isInlineSpecified()) 1048 return false; 1049 } 1050 1051 if (FD->doesThisDeclarationHaveABody() && 1052 Context.DeclMustBeEmitted(FD)) 1053 return false; 1054 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1055 if (!VD->isFileVarDecl() || 1056 VD->getType().isConstant(Context) || 1057 Context.DeclMustBeEmitted(VD)) 1058 return false; 1059 1060 if (VD->isStaticDataMember() && 1061 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1062 return false; 1063 1064 } else { 1065 return false; 1066 } 1067 1068 // Only warn for unused decls internal to the translation unit. 1069 if (D->getLinkage() == ExternalLinkage) 1070 return false; 1071 1072 return true; 1073} 1074 1075void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1076 if (!D) 1077 return; 1078 1079 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1080 const FunctionDecl *First = FD->getFirstDeclaration(); 1081 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1082 return; // First should already be in the vector. 1083 } 1084 1085 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1086 const VarDecl *First = VD->getFirstDeclaration(); 1087 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1088 return; // First should already be in the vector. 1089 } 1090 1091 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1092 UnusedFileScopedDecls.push_back(D); 1093 } 1094 1095static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1096 if (D->isInvalidDecl()) 1097 return false; 1098 1099 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1100 return false; 1101 1102 if (isa<LabelDecl>(D)) 1103 return true; 1104 1105 // White-list anything that isn't a local variable. 1106 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1107 !D->getDeclContext()->isFunctionOrMethod()) 1108 return false; 1109 1110 // Types of valid local variables should be complete, so this should succeed. 1111 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1112 1113 // White-list anything with an __attribute__((unused)) type. 1114 QualType Ty = VD->getType(); 1115 1116 // Only look at the outermost level of typedef. 1117 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1118 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1119 return false; 1120 } 1121 1122 // If we failed to complete the type for some reason, or if the type is 1123 // dependent, don't diagnose the variable. 1124 if (Ty->isIncompleteType() || Ty->isDependentType()) 1125 return false; 1126 1127 if (const TagType *TT = Ty->getAs<TagType>()) { 1128 const TagDecl *Tag = TT->getDecl(); 1129 if (Tag->hasAttr<UnusedAttr>()) 1130 return false; 1131 1132 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1133 // FIXME: Checking for the presence of a user-declared constructor 1134 // isn't completely accurate; we'd prefer to check that the initializer 1135 // has no side effects. 1136 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1137 return false; 1138 } 1139 } 1140 1141 // TODO: __attribute__((unused)) templates? 1142 } 1143 1144 return true; 1145} 1146 1147static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1148 FixItHint &Hint) { 1149 if (isa<LabelDecl>(D)) { 1150 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1151 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1152 if (AfterColon.isInvalid()) 1153 return; 1154 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1155 getCharRange(D->getLocStart(), AfterColon)); 1156 } 1157 return; 1158} 1159 1160/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1161/// unless they are marked attr(unused). 1162void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1163 FixItHint Hint; 1164 if (!ShouldDiagnoseUnusedDecl(D)) 1165 return; 1166 1167 GenerateFixForUnusedDecl(D, Context, Hint); 1168 1169 unsigned DiagID; 1170 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1171 DiagID = diag::warn_unused_exception_param; 1172 else if (isa<LabelDecl>(D)) 1173 DiagID = diag::warn_unused_label; 1174 else 1175 DiagID = diag::warn_unused_variable; 1176 1177 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1178} 1179 1180static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1181 // Verify that we have no forward references left. If so, there was a goto 1182 // or address of a label taken, but no definition of it. Label fwd 1183 // definitions are indicated with a null substmt. 1184 if (L->getStmt() == 0) 1185 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1186} 1187 1188void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1189 if (S->decl_empty()) return; 1190 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1191 "Scope shouldn't contain decls!"); 1192 1193 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1194 I != E; ++I) { 1195 Decl *TmpD = (*I); 1196 assert(TmpD && "This decl didn't get pushed??"); 1197 1198 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1199 NamedDecl *D = cast<NamedDecl>(TmpD); 1200 1201 if (!D->getDeclName()) continue; 1202 1203 // Diagnose unused variables in this scope. 1204 if (!S->hasErrorOccurred()) 1205 DiagnoseUnusedDecl(D); 1206 1207 // If this was a forward reference to a label, verify it was defined. 1208 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1209 CheckPoppedLabel(LD, *this); 1210 1211 // Remove this name from our lexical scope. 1212 IdResolver.RemoveDecl(D); 1213 } 1214} 1215 1216/// \brief Look for an Objective-C class in the translation unit. 1217/// 1218/// \param Id The name of the Objective-C class we're looking for. If 1219/// typo-correction fixes this name, the Id will be updated 1220/// to the fixed name. 1221/// 1222/// \param IdLoc The location of the name in the translation unit. 1223/// 1224/// \param TypoCorrection If true, this routine will attempt typo correction 1225/// if there is no class with the given name. 1226/// 1227/// \returns The declaration of the named Objective-C class, or NULL if the 1228/// class could not be found. 1229ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1230 SourceLocation IdLoc, 1231 bool DoTypoCorrection) { 1232 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1233 // creation from this context. 1234 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1235 1236 if (!IDecl && DoTypoCorrection) { 1237 // Perform typo correction at the given location, but only if we 1238 // find an Objective-C class name. 1239 TypoCorrection C; 1240 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1241 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1242 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1243 Diag(IdLoc, diag::err_undef_interface_suggest) 1244 << Id << IDecl->getDeclName() 1245 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1246 Diag(IDecl->getLocation(), diag::note_previous_decl) 1247 << IDecl->getDeclName(); 1248 1249 Id = IDecl->getIdentifier(); 1250 } 1251 } 1252 1253 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1254} 1255 1256/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1257/// from S, where a non-field would be declared. This routine copes 1258/// with the difference between C and C++ scoping rules in structs and 1259/// unions. For example, the following code is well-formed in C but 1260/// ill-formed in C++: 1261/// @code 1262/// struct S6 { 1263/// enum { BAR } e; 1264/// }; 1265/// 1266/// void test_S6() { 1267/// struct S6 a; 1268/// a.e = BAR; 1269/// } 1270/// @endcode 1271/// For the declaration of BAR, this routine will return a different 1272/// scope. The scope S will be the scope of the unnamed enumeration 1273/// within S6. In C++, this routine will return the scope associated 1274/// with S6, because the enumeration's scope is a transparent 1275/// context but structures can contain non-field names. In C, this 1276/// routine will return the translation unit scope, since the 1277/// enumeration's scope is a transparent context and structures cannot 1278/// contain non-field names. 1279Scope *Sema::getNonFieldDeclScope(Scope *S) { 1280 while (((S->getFlags() & Scope::DeclScope) == 0) || 1281 (S->getEntity() && 1282 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1283 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1284 S = S->getParent(); 1285 return S; 1286} 1287 1288/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1289/// file scope. lazily create a decl for it. ForRedeclaration is true 1290/// if we're creating this built-in in anticipation of redeclaring the 1291/// built-in. 1292NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1293 Scope *S, bool ForRedeclaration, 1294 SourceLocation Loc) { 1295 Builtin::ID BID = (Builtin::ID)bid; 1296 1297 ASTContext::GetBuiltinTypeError Error; 1298 QualType R = Context.GetBuiltinType(BID, Error); 1299 switch (Error) { 1300 case ASTContext::GE_None: 1301 // Okay 1302 break; 1303 1304 case ASTContext::GE_Missing_stdio: 1305 if (ForRedeclaration) 1306 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1307 << Context.BuiltinInfo.GetName(BID); 1308 return 0; 1309 1310 case ASTContext::GE_Missing_setjmp: 1311 if (ForRedeclaration) 1312 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1313 << Context.BuiltinInfo.GetName(BID); 1314 return 0; 1315 1316 case ASTContext::GE_Missing_ucontext: 1317 if (ForRedeclaration) 1318 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1319 << Context.BuiltinInfo.GetName(BID); 1320 return 0; 1321 } 1322 1323 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1324 Diag(Loc, diag::ext_implicit_lib_function_decl) 1325 << Context.BuiltinInfo.GetName(BID) 1326 << R; 1327 if (Context.BuiltinInfo.getHeaderName(BID) && 1328 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1329 != DiagnosticsEngine::Ignored) 1330 Diag(Loc, diag::note_please_include_header) 1331 << Context.BuiltinInfo.getHeaderName(BID) 1332 << Context.BuiltinInfo.GetName(BID); 1333 } 1334 1335 FunctionDecl *New = FunctionDecl::Create(Context, 1336 Context.getTranslationUnitDecl(), 1337 Loc, Loc, II, R, /*TInfo=*/0, 1338 SC_Extern, 1339 SC_None, false, 1340 /*hasPrototype=*/true); 1341 New->setImplicit(); 1342 1343 // Create Decl objects for each parameter, adding them to the 1344 // FunctionDecl. 1345 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1346 SmallVector<ParmVarDecl*, 16> Params; 1347 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1348 ParmVarDecl *parm = 1349 ParmVarDecl::Create(Context, New, SourceLocation(), 1350 SourceLocation(), 0, 1351 FT->getArgType(i), /*TInfo=*/0, 1352 SC_None, SC_None, 0); 1353 parm->setScopeInfo(0, i); 1354 Params.push_back(parm); 1355 } 1356 New->setParams(Params); 1357 } 1358 1359 AddKnownFunctionAttributes(New); 1360 1361 // TUScope is the translation-unit scope to insert this function into. 1362 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1363 // relate Scopes to DeclContexts, and probably eliminate CurContext 1364 // entirely, but we're not there yet. 1365 DeclContext *SavedContext = CurContext; 1366 CurContext = Context.getTranslationUnitDecl(); 1367 PushOnScopeChains(New, TUScope); 1368 CurContext = SavedContext; 1369 return New; 1370} 1371 1372/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1373/// same name and scope as a previous declaration 'Old'. Figure out 1374/// how to resolve this situation, merging decls or emitting 1375/// diagnostics as appropriate. If there was an error, set New to be invalid. 1376/// 1377void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1378 // If the new decl is known invalid already, don't bother doing any 1379 // merging checks. 1380 if (New->isInvalidDecl()) return; 1381 1382 // Allow multiple definitions for ObjC built-in typedefs. 1383 // FIXME: Verify the underlying types are equivalent! 1384 if (getLangOptions().ObjC1) { 1385 const IdentifierInfo *TypeID = New->getIdentifier(); 1386 switch (TypeID->getLength()) { 1387 default: break; 1388 case 2: 1389 if (!TypeID->isStr("id")) 1390 break; 1391 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1392 // Install the built-in type for 'id', ignoring the current definition. 1393 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1394 return; 1395 case 5: 1396 if (!TypeID->isStr("Class")) 1397 break; 1398 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1399 // Install the built-in type for 'Class', ignoring the current definition. 1400 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1401 return; 1402 case 3: 1403 if (!TypeID->isStr("SEL")) 1404 break; 1405 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1406 // Install the built-in type for 'SEL', ignoring the current definition. 1407 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1408 return; 1409 } 1410 // Fall through - the typedef name was not a builtin type. 1411 } 1412 1413 // Verify the old decl was also a type. 1414 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1415 if (!Old) { 1416 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1417 << New->getDeclName(); 1418 1419 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1420 if (OldD->getLocation().isValid()) 1421 Diag(OldD->getLocation(), diag::note_previous_definition); 1422 1423 return New->setInvalidDecl(); 1424 } 1425 1426 // If the old declaration is invalid, just give up here. 1427 if (Old->isInvalidDecl()) 1428 return New->setInvalidDecl(); 1429 1430 // Determine the "old" type we'll use for checking and diagnostics. 1431 QualType OldType; 1432 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1433 OldType = OldTypedef->getUnderlyingType(); 1434 else 1435 OldType = Context.getTypeDeclType(Old); 1436 1437 // If the typedef types are not identical, reject them in all languages and 1438 // with any extensions enabled. 1439 1440 if (OldType != New->getUnderlyingType() && 1441 Context.getCanonicalType(OldType) != 1442 Context.getCanonicalType(New->getUnderlyingType())) { 1443 int Kind = 0; 1444 if (isa<TypeAliasDecl>(Old)) 1445 Kind = 1; 1446 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1447 << Kind << New->getUnderlyingType() << OldType; 1448 if (Old->getLocation().isValid()) 1449 Diag(Old->getLocation(), diag::note_previous_definition); 1450 return New->setInvalidDecl(); 1451 } 1452 1453 // The types match. Link up the redeclaration chain if the old 1454 // declaration was a typedef. 1455 // FIXME: this is a potential source of weirdness if the type 1456 // spellings don't match exactly. 1457 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1458 New->setPreviousDeclaration(Typedef); 1459 1460 // __module_private__ is propagated to later declarations. 1461 if (Old->isModulePrivate()) 1462 New->setModulePrivate(); 1463 else if (New->isModulePrivate()) 1464 diagnoseModulePrivateRedeclaration(New, Old); 1465 1466 if (getLangOptions().MicrosoftExt) 1467 return; 1468 1469 if (getLangOptions().CPlusPlus) { 1470 // C++ [dcl.typedef]p2: 1471 // In a given non-class scope, a typedef specifier can be used to 1472 // redefine the name of any type declared in that scope to refer 1473 // to the type to which it already refers. 1474 if (!isa<CXXRecordDecl>(CurContext)) 1475 return; 1476 1477 // C++0x [dcl.typedef]p4: 1478 // In a given class scope, a typedef specifier can be used to redefine 1479 // any class-name declared in that scope that is not also a typedef-name 1480 // to refer to the type to which it already refers. 1481 // 1482 // This wording came in via DR424, which was a correction to the 1483 // wording in DR56, which accidentally banned code like: 1484 // 1485 // struct S { 1486 // typedef struct A { } A; 1487 // }; 1488 // 1489 // in the C++03 standard. We implement the C++0x semantics, which 1490 // allow the above but disallow 1491 // 1492 // struct S { 1493 // typedef int I; 1494 // typedef int I; 1495 // }; 1496 // 1497 // since that was the intent of DR56. 1498 if (!isa<TypedefNameDecl>(Old)) 1499 return; 1500 1501 Diag(New->getLocation(), diag::err_redefinition) 1502 << New->getDeclName(); 1503 Diag(Old->getLocation(), diag::note_previous_definition); 1504 return New->setInvalidDecl(); 1505 } 1506 1507 // If we have a redefinition of a typedef in C, emit a warning. This warning 1508 // is normally mapped to an error, but can be controlled with 1509 // -Wtypedef-redefinition. If either the original or the redefinition is 1510 // in a system header, don't emit this for compatibility with GCC. 1511 if (getDiagnostics().getSuppressSystemWarnings() && 1512 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1513 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1514 return; 1515 1516 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1517 << New->getDeclName(); 1518 Diag(Old->getLocation(), diag::note_previous_definition); 1519 return; 1520} 1521 1522/// DeclhasAttr - returns true if decl Declaration already has the target 1523/// attribute. 1524static bool 1525DeclHasAttr(const Decl *D, const Attr *A) { 1526 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1527 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1528 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1529 if ((*i)->getKind() == A->getKind()) { 1530 if (Ann) { 1531 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1532 return true; 1533 continue; 1534 } 1535 // FIXME: Don't hardcode this check 1536 if (OA && isa<OwnershipAttr>(*i)) 1537 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1538 return true; 1539 } 1540 1541 return false; 1542} 1543 1544/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1545static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1546 ASTContext &C, bool mergeDeprecation = true) { 1547 if (!oldDecl->hasAttrs()) 1548 return; 1549 1550 bool foundAny = newDecl->hasAttrs(); 1551 1552 // Ensure that any moving of objects within the allocated map is done before 1553 // we process them. 1554 if (!foundAny) newDecl->setAttrs(AttrVec()); 1555 1556 for (specific_attr_iterator<InheritableAttr> 1557 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1558 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1559 // Ignore deprecated/unavailable/availability attributes if requested. 1560 if (!mergeDeprecation && 1561 (isa<DeprecatedAttr>(*i) || 1562 isa<UnavailableAttr>(*i) || 1563 isa<AvailabilityAttr>(*i))) 1564 continue; 1565 1566 if (!DeclHasAttr(newDecl, *i)) { 1567 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1568 newAttr->setInherited(true); 1569 newDecl->addAttr(newAttr); 1570 foundAny = true; 1571 } 1572 } 1573 1574 if (!foundAny) newDecl->dropAttrs(); 1575} 1576 1577/// mergeParamDeclAttributes - Copy attributes from the old parameter 1578/// to the new one. 1579static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1580 const ParmVarDecl *oldDecl, 1581 ASTContext &C) { 1582 if (!oldDecl->hasAttrs()) 1583 return; 1584 1585 bool foundAny = newDecl->hasAttrs(); 1586 1587 // Ensure that any moving of objects within the allocated map is 1588 // done before we process them. 1589 if (!foundAny) newDecl->setAttrs(AttrVec()); 1590 1591 for (specific_attr_iterator<InheritableParamAttr> 1592 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1593 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1594 if (!DeclHasAttr(newDecl, *i)) { 1595 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1596 newAttr->setInherited(true); 1597 newDecl->addAttr(newAttr); 1598 foundAny = true; 1599 } 1600 } 1601 1602 if (!foundAny) newDecl->dropAttrs(); 1603} 1604 1605namespace { 1606 1607/// Used in MergeFunctionDecl to keep track of function parameters in 1608/// C. 1609struct GNUCompatibleParamWarning { 1610 ParmVarDecl *OldParm; 1611 ParmVarDecl *NewParm; 1612 QualType PromotedType; 1613}; 1614 1615} 1616 1617/// getSpecialMember - get the special member enum for a method. 1618Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1619 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1620 if (Ctor->isDefaultConstructor()) 1621 return Sema::CXXDefaultConstructor; 1622 1623 if (Ctor->isCopyConstructor()) 1624 return Sema::CXXCopyConstructor; 1625 1626 if (Ctor->isMoveConstructor()) 1627 return Sema::CXXMoveConstructor; 1628 } else if (isa<CXXDestructorDecl>(MD)) { 1629 return Sema::CXXDestructor; 1630 } else if (MD->isCopyAssignmentOperator()) { 1631 return Sema::CXXCopyAssignment; 1632 } else if (MD->isMoveAssignmentOperator()) { 1633 return Sema::CXXMoveAssignment; 1634 } 1635 1636 return Sema::CXXInvalid; 1637} 1638 1639/// canRedefineFunction - checks if a function can be redefined. Currently, 1640/// only extern inline functions can be redefined, and even then only in 1641/// GNU89 mode. 1642static bool canRedefineFunction(const FunctionDecl *FD, 1643 const LangOptions& LangOpts) { 1644 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1645 !LangOpts.CPlusPlus && 1646 FD->isInlineSpecified() && 1647 FD->getStorageClass() == SC_Extern); 1648} 1649 1650/// MergeFunctionDecl - We just parsed a function 'New' from 1651/// declarator D which has the same name and scope as a previous 1652/// declaration 'Old'. Figure out how to resolve this situation, 1653/// merging decls or emitting diagnostics as appropriate. 1654/// 1655/// In C++, New and Old must be declarations that are not 1656/// overloaded. Use IsOverload to determine whether New and Old are 1657/// overloaded, and to select the Old declaration that New should be 1658/// merged with. 1659/// 1660/// Returns true if there was an error, false otherwise. 1661bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1662 // Verify the old decl was also a function. 1663 FunctionDecl *Old = 0; 1664 if (FunctionTemplateDecl *OldFunctionTemplate 1665 = dyn_cast<FunctionTemplateDecl>(OldD)) 1666 Old = OldFunctionTemplate->getTemplatedDecl(); 1667 else 1668 Old = dyn_cast<FunctionDecl>(OldD); 1669 if (!Old) { 1670 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1671 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1672 Diag(Shadow->getTargetDecl()->getLocation(), 1673 diag::note_using_decl_target); 1674 Diag(Shadow->getUsingDecl()->getLocation(), 1675 diag::note_using_decl) << 0; 1676 return true; 1677 } 1678 1679 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1680 << New->getDeclName(); 1681 Diag(OldD->getLocation(), diag::note_previous_definition); 1682 return true; 1683 } 1684 1685 // Determine whether the previous declaration was a definition, 1686 // implicit declaration, or a declaration. 1687 diag::kind PrevDiag; 1688 if (Old->isThisDeclarationADefinition()) 1689 PrevDiag = diag::note_previous_definition; 1690 else if (Old->isImplicit()) 1691 PrevDiag = diag::note_previous_implicit_declaration; 1692 else 1693 PrevDiag = diag::note_previous_declaration; 1694 1695 QualType OldQType = Context.getCanonicalType(Old->getType()); 1696 QualType NewQType = Context.getCanonicalType(New->getType()); 1697 1698 // Don't complain about this if we're in GNU89 mode and the old function 1699 // is an extern inline function. 1700 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1701 New->getStorageClass() == SC_Static && 1702 Old->getStorageClass() != SC_Static && 1703 !canRedefineFunction(Old, getLangOptions())) { 1704 if (getLangOptions().MicrosoftExt) { 1705 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1706 Diag(Old->getLocation(), PrevDiag); 1707 } else { 1708 Diag(New->getLocation(), diag::err_static_non_static) << New; 1709 Diag(Old->getLocation(), PrevDiag); 1710 return true; 1711 } 1712 } 1713 1714 // If a function is first declared with a calling convention, but is 1715 // later declared or defined without one, the second decl assumes the 1716 // calling convention of the first. 1717 // 1718 // For the new decl, we have to look at the NON-canonical type to tell the 1719 // difference between a function that really doesn't have a calling 1720 // convention and one that is declared cdecl. That's because in 1721 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1722 // because it is the default calling convention. 1723 // 1724 // Note also that we DO NOT return at this point, because we still have 1725 // other tests to run. 1726 const FunctionType *OldType = cast<FunctionType>(OldQType); 1727 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1728 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1729 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1730 bool RequiresAdjustment = false; 1731 if (OldTypeInfo.getCC() != CC_Default && 1732 NewTypeInfo.getCC() == CC_Default) { 1733 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1734 RequiresAdjustment = true; 1735 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1736 NewTypeInfo.getCC())) { 1737 // Calling conventions really aren't compatible, so complain. 1738 Diag(New->getLocation(), diag::err_cconv_change) 1739 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1740 << (OldTypeInfo.getCC() == CC_Default) 1741 << (OldTypeInfo.getCC() == CC_Default ? "" : 1742 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1743 Diag(Old->getLocation(), diag::note_previous_declaration); 1744 return true; 1745 } 1746 1747 // FIXME: diagnose the other way around? 1748 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1749 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1750 RequiresAdjustment = true; 1751 } 1752 1753 // Merge regparm attribute. 1754 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1755 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1756 if (NewTypeInfo.getHasRegParm()) { 1757 Diag(New->getLocation(), diag::err_regparm_mismatch) 1758 << NewType->getRegParmType() 1759 << OldType->getRegParmType(); 1760 Diag(Old->getLocation(), diag::note_previous_declaration); 1761 return true; 1762 } 1763 1764 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1765 RequiresAdjustment = true; 1766 } 1767 1768 // Merge ns_returns_retained attribute. 1769 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1770 if (NewTypeInfo.getProducesResult()) { 1771 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1772 Diag(Old->getLocation(), diag::note_previous_declaration); 1773 return true; 1774 } 1775 1776 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1777 RequiresAdjustment = true; 1778 } 1779 1780 if (RequiresAdjustment) { 1781 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1782 New->setType(QualType(NewType, 0)); 1783 NewQType = Context.getCanonicalType(New->getType()); 1784 } 1785 1786 if (getLangOptions().CPlusPlus) { 1787 // (C++98 13.1p2): 1788 // Certain function declarations cannot be overloaded: 1789 // -- Function declarations that differ only in the return type 1790 // cannot be overloaded. 1791 QualType OldReturnType = OldType->getResultType(); 1792 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1793 QualType ResQT; 1794 if (OldReturnType != NewReturnType) { 1795 if (NewReturnType->isObjCObjectPointerType() 1796 && OldReturnType->isObjCObjectPointerType()) 1797 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1798 if (ResQT.isNull()) { 1799 if (New->isCXXClassMember() && New->isOutOfLine()) 1800 Diag(New->getLocation(), 1801 diag::err_member_def_does_not_match_ret_type) << New; 1802 else 1803 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1804 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1805 return true; 1806 } 1807 else 1808 NewQType = ResQT; 1809 } 1810 1811 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1812 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1813 if (OldMethod && NewMethod) { 1814 // Preserve triviality. 1815 NewMethod->setTrivial(OldMethod->isTrivial()); 1816 1817 // MSVC allows explicit template specialization at class scope: 1818 // 2 CXMethodDecls referring to the same function will be injected. 1819 // We don't want a redeclartion error. 1820 bool IsClassScopeExplicitSpecialization = 1821 OldMethod->isFunctionTemplateSpecialization() && 1822 NewMethod->isFunctionTemplateSpecialization(); 1823 bool isFriend = NewMethod->getFriendObjectKind(); 1824 1825 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1826 !IsClassScopeExplicitSpecialization) { 1827 // -- Member function declarations with the same name and the 1828 // same parameter types cannot be overloaded if any of them 1829 // is a static member function declaration. 1830 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1831 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1832 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1833 return true; 1834 } 1835 1836 // C++ [class.mem]p1: 1837 // [...] A member shall not be declared twice in the 1838 // member-specification, except that a nested class or member 1839 // class template can be declared and then later defined. 1840 unsigned NewDiag; 1841 if (isa<CXXConstructorDecl>(OldMethod)) 1842 NewDiag = diag::err_constructor_redeclared; 1843 else if (isa<CXXDestructorDecl>(NewMethod)) 1844 NewDiag = diag::err_destructor_redeclared; 1845 else if (isa<CXXConversionDecl>(NewMethod)) 1846 NewDiag = diag::err_conv_function_redeclared; 1847 else 1848 NewDiag = diag::err_member_redeclared; 1849 1850 Diag(New->getLocation(), NewDiag); 1851 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1852 1853 // Complain if this is an explicit declaration of a special 1854 // member that was initially declared implicitly. 1855 // 1856 // As an exception, it's okay to befriend such methods in order 1857 // to permit the implicit constructor/destructor/operator calls. 1858 } else if (OldMethod->isImplicit()) { 1859 if (isFriend) { 1860 NewMethod->setImplicit(); 1861 } else { 1862 Diag(NewMethod->getLocation(), 1863 diag::err_definition_of_implicitly_declared_member) 1864 << New << getSpecialMember(OldMethod); 1865 return true; 1866 } 1867 } else if (OldMethod->isExplicitlyDefaulted()) { 1868 Diag(NewMethod->getLocation(), 1869 diag::err_definition_of_explicitly_defaulted_member) 1870 << getSpecialMember(OldMethod); 1871 return true; 1872 } 1873 } 1874 1875 // (C++98 8.3.5p3): 1876 // All declarations for a function shall agree exactly in both the 1877 // return type and the parameter-type-list. 1878 // We also want to respect all the extended bits except noreturn. 1879 1880 // noreturn should now match unless the old type info didn't have it. 1881 QualType OldQTypeForComparison = OldQType; 1882 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1883 assert(OldQType == QualType(OldType, 0)); 1884 const FunctionType *OldTypeForComparison 1885 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1886 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1887 assert(OldQTypeForComparison.isCanonical()); 1888 } 1889 1890 if (OldQTypeForComparison == NewQType) 1891 return MergeCompatibleFunctionDecls(New, Old); 1892 1893 // Fall through for conflicting redeclarations and redefinitions. 1894 } 1895 1896 // C: Function types need to be compatible, not identical. This handles 1897 // duplicate function decls like "void f(int); void f(enum X);" properly. 1898 if (!getLangOptions().CPlusPlus && 1899 Context.typesAreCompatible(OldQType, NewQType)) { 1900 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1901 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1902 const FunctionProtoType *OldProto = 0; 1903 if (isa<FunctionNoProtoType>(NewFuncType) && 1904 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1905 // The old declaration provided a function prototype, but the 1906 // new declaration does not. Merge in the prototype. 1907 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1908 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1909 OldProto->arg_type_end()); 1910 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1911 ParamTypes.data(), ParamTypes.size(), 1912 OldProto->getExtProtoInfo()); 1913 New->setType(NewQType); 1914 New->setHasInheritedPrototype(); 1915 1916 // Synthesize a parameter for each argument type. 1917 SmallVector<ParmVarDecl*, 16> Params; 1918 for (FunctionProtoType::arg_type_iterator 1919 ParamType = OldProto->arg_type_begin(), 1920 ParamEnd = OldProto->arg_type_end(); 1921 ParamType != ParamEnd; ++ParamType) { 1922 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1923 SourceLocation(), 1924 SourceLocation(), 0, 1925 *ParamType, /*TInfo=*/0, 1926 SC_None, SC_None, 1927 0); 1928 Param->setScopeInfo(0, Params.size()); 1929 Param->setImplicit(); 1930 Params.push_back(Param); 1931 } 1932 1933 New->setParams(Params); 1934 } 1935 1936 return MergeCompatibleFunctionDecls(New, Old); 1937 } 1938 1939 // GNU C permits a K&R definition to follow a prototype declaration 1940 // if the declared types of the parameters in the K&R definition 1941 // match the types in the prototype declaration, even when the 1942 // promoted types of the parameters from the K&R definition differ 1943 // from the types in the prototype. GCC then keeps the types from 1944 // the prototype. 1945 // 1946 // If a variadic prototype is followed by a non-variadic K&R definition, 1947 // the K&R definition becomes variadic. This is sort of an edge case, but 1948 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1949 // C99 6.9.1p8. 1950 if (!getLangOptions().CPlusPlus && 1951 Old->hasPrototype() && !New->hasPrototype() && 1952 New->getType()->getAs<FunctionProtoType>() && 1953 Old->getNumParams() == New->getNumParams()) { 1954 SmallVector<QualType, 16> ArgTypes; 1955 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1956 const FunctionProtoType *OldProto 1957 = Old->getType()->getAs<FunctionProtoType>(); 1958 const FunctionProtoType *NewProto 1959 = New->getType()->getAs<FunctionProtoType>(); 1960 1961 // Determine whether this is the GNU C extension. 1962 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1963 NewProto->getResultType()); 1964 bool LooseCompatible = !MergedReturn.isNull(); 1965 for (unsigned Idx = 0, End = Old->getNumParams(); 1966 LooseCompatible && Idx != End; ++Idx) { 1967 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1968 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1969 if (Context.typesAreCompatible(OldParm->getType(), 1970 NewProto->getArgType(Idx))) { 1971 ArgTypes.push_back(NewParm->getType()); 1972 } else if (Context.typesAreCompatible(OldParm->getType(), 1973 NewParm->getType(), 1974 /*CompareUnqualified=*/true)) { 1975 GNUCompatibleParamWarning Warn 1976 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1977 Warnings.push_back(Warn); 1978 ArgTypes.push_back(NewParm->getType()); 1979 } else 1980 LooseCompatible = false; 1981 } 1982 1983 if (LooseCompatible) { 1984 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1985 Diag(Warnings[Warn].NewParm->getLocation(), 1986 diag::ext_param_promoted_not_compatible_with_prototype) 1987 << Warnings[Warn].PromotedType 1988 << Warnings[Warn].OldParm->getType(); 1989 if (Warnings[Warn].OldParm->getLocation().isValid()) 1990 Diag(Warnings[Warn].OldParm->getLocation(), 1991 diag::note_previous_declaration); 1992 } 1993 1994 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1995 ArgTypes.size(), 1996 OldProto->getExtProtoInfo())); 1997 return MergeCompatibleFunctionDecls(New, Old); 1998 } 1999 2000 // Fall through to diagnose conflicting types. 2001 } 2002 2003 // A function that has already been declared has been redeclared or defined 2004 // with a different type- show appropriate diagnostic 2005 if (unsigned BuiltinID = Old->getBuiltinID()) { 2006 // The user has declared a builtin function with an incompatible 2007 // signature. 2008 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2009 // The function the user is redeclaring is a library-defined 2010 // function like 'malloc' or 'printf'. Warn about the 2011 // redeclaration, then pretend that we don't know about this 2012 // library built-in. 2013 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2014 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2015 << Old << Old->getType(); 2016 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2017 Old->setInvalidDecl(); 2018 return false; 2019 } 2020 2021 PrevDiag = diag::note_previous_builtin_declaration; 2022 } 2023 2024 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2025 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2026 return true; 2027} 2028 2029/// \brief Completes the merge of two function declarations that are 2030/// known to be compatible. 2031/// 2032/// This routine handles the merging of attributes and other 2033/// properties of function declarations form the old declaration to 2034/// the new declaration, once we know that New is in fact a 2035/// redeclaration of Old. 2036/// 2037/// \returns false 2038bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2039 // Merge the attributes 2040 mergeDeclAttributes(New, Old, Context); 2041 2042 // Merge the storage class. 2043 if (Old->getStorageClass() != SC_Extern && 2044 Old->getStorageClass() != SC_None) 2045 New->setStorageClass(Old->getStorageClass()); 2046 2047 // Merge "pure" flag. 2048 if (Old->isPure()) 2049 New->setPure(); 2050 2051 // __module_private__ is propagated to later declarations. 2052 if (Old->isModulePrivate()) 2053 New->setModulePrivate(); 2054 else if (New->isModulePrivate()) 2055 diagnoseModulePrivateRedeclaration(New, Old); 2056 2057 // Merge attributes from the parameters. These can mismatch with K&R 2058 // declarations. 2059 if (New->getNumParams() == Old->getNumParams()) 2060 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2061 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2062 Context); 2063 2064 if (getLangOptions().CPlusPlus) 2065 return MergeCXXFunctionDecl(New, Old); 2066 2067 return false; 2068} 2069 2070 2071void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2072 const ObjCMethodDecl *oldMethod) { 2073 // We don't want to merge unavailable and deprecated attributes 2074 // except from interface to implementation. 2075 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2076 2077 // Merge the attributes. 2078 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2079 2080 // Merge attributes from the parameters. 2081 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2082 for (ObjCMethodDecl::param_iterator 2083 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2084 ni != ne; ++ni, ++oi) 2085 mergeParamDeclAttributes(*ni, *oi, Context); 2086 2087 CheckObjCMethodOverride(newMethod, oldMethod, true); 2088} 2089 2090/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2091/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2092/// emitting diagnostics as appropriate. 2093/// 2094/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2095/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2096/// check them before the initializer is attached. 2097/// 2098void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2099 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2100 return; 2101 2102 QualType MergedT; 2103 if (getLangOptions().CPlusPlus) { 2104 AutoType *AT = New->getType()->getContainedAutoType(); 2105 if (AT && !AT->isDeduced()) { 2106 // We don't know what the new type is until the initializer is attached. 2107 return; 2108 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2109 // These could still be something that needs exception specs checked. 2110 return MergeVarDeclExceptionSpecs(New, Old); 2111 } 2112 // C++ [basic.link]p10: 2113 // [...] the types specified by all declarations referring to a given 2114 // object or function shall be identical, except that declarations for an 2115 // array object can specify array types that differ by the presence or 2116 // absence of a major array bound (8.3.4). 2117 else if (Old->getType()->isIncompleteArrayType() && 2118 New->getType()->isArrayType()) { 2119 CanQual<ArrayType> OldArray 2120 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2121 CanQual<ArrayType> NewArray 2122 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2123 if (OldArray->getElementType() == NewArray->getElementType()) 2124 MergedT = New->getType(); 2125 } else if (Old->getType()->isArrayType() && 2126 New->getType()->isIncompleteArrayType()) { 2127 CanQual<ArrayType> OldArray 2128 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2129 CanQual<ArrayType> NewArray 2130 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2131 if (OldArray->getElementType() == NewArray->getElementType()) 2132 MergedT = Old->getType(); 2133 } else if (New->getType()->isObjCObjectPointerType() 2134 && Old->getType()->isObjCObjectPointerType()) { 2135 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2136 Old->getType()); 2137 } 2138 } else { 2139 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2140 } 2141 if (MergedT.isNull()) { 2142 Diag(New->getLocation(), diag::err_redefinition_different_type) 2143 << New->getDeclName(); 2144 Diag(Old->getLocation(), diag::note_previous_definition); 2145 return New->setInvalidDecl(); 2146 } 2147 New->setType(MergedT); 2148} 2149 2150/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2151/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2152/// situation, merging decls or emitting diagnostics as appropriate. 2153/// 2154/// Tentative definition rules (C99 6.9.2p2) are checked by 2155/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2156/// definitions here, since the initializer hasn't been attached. 2157/// 2158void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2159 // If the new decl is already invalid, don't do any other checking. 2160 if (New->isInvalidDecl()) 2161 return; 2162 2163 // Verify the old decl was also a variable. 2164 VarDecl *Old = 0; 2165 if (!Previous.isSingleResult() || 2166 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2167 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2168 << New->getDeclName(); 2169 Diag(Previous.getRepresentativeDecl()->getLocation(), 2170 diag::note_previous_definition); 2171 return New->setInvalidDecl(); 2172 } 2173 2174 // C++ [class.mem]p1: 2175 // A member shall not be declared twice in the member-specification [...] 2176 // 2177 // Here, we need only consider static data members. 2178 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2179 Diag(New->getLocation(), diag::err_duplicate_member) 2180 << New->getIdentifier(); 2181 Diag(Old->getLocation(), diag::note_previous_declaration); 2182 New->setInvalidDecl(); 2183 } 2184 2185 mergeDeclAttributes(New, Old, Context); 2186 // Warn if an already-declared variable is made a weak_import in a subsequent 2187 // declaration 2188 if (New->getAttr<WeakImportAttr>() && 2189 Old->getStorageClass() == SC_None && 2190 !Old->getAttr<WeakImportAttr>()) { 2191 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 // Remove weak_import attribute on new declaration. 2194 New->dropAttr<WeakImportAttr>(); 2195 } 2196 2197 // Merge the types. 2198 MergeVarDeclTypes(New, Old); 2199 if (New->isInvalidDecl()) 2200 return; 2201 2202 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2203 if (New->getStorageClass() == SC_Static && 2204 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2205 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2206 Diag(Old->getLocation(), diag::note_previous_definition); 2207 return New->setInvalidDecl(); 2208 } 2209 // C99 6.2.2p4: 2210 // For an identifier declared with the storage-class specifier 2211 // extern in a scope in which a prior declaration of that 2212 // identifier is visible,23) if the prior declaration specifies 2213 // internal or external linkage, the linkage of the identifier at 2214 // the later declaration is the same as the linkage specified at 2215 // the prior declaration. If no prior declaration is visible, or 2216 // if the prior declaration specifies no linkage, then the 2217 // identifier has external linkage. 2218 if (New->hasExternalStorage() && Old->hasLinkage()) 2219 /* Okay */; 2220 else if (New->getStorageClass() != SC_Static && 2221 Old->getStorageClass() == SC_Static) { 2222 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2223 Diag(Old->getLocation(), diag::note_previous_definition); 2224 return New->setInvalidDecl(); 2225 } 2226 2227 // Check if extern is followed by non-extern and vice-versa. 2228 if (New->hasExternalStorage() && 2229 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2230 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2231 Diag(Old->getLocation(), diag::note_previous_definition); 2232 return New->setInvalidDecl(); 2233 } 2234 if (Old->hasExternalStorage() && 2235 !New->hasLinkage() && New->isLocalVarDecl()) { 2236 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2237 Diag(Old->getLocation(), diag::note_previous_definition); 2238 return New->setInvalidDecl(); 2239 } 2240 2241 // __module_private__ is propagated to later declarations. 2242 if (Old->isModulePrivate()) 2243 New->setModulePrivate(); 2244 else if (New->isModulePrivate()) 2245 diagnoseModulePrivateRedeclaration(New, Old); 2246 2247 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2248 2249 // FIXME: The test for external storage here seems wrong? We still 2250 // need to check for mismatches. 2251 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2252 // Don't complain about out-of-line definitions of static members. 2253 !(Old->getLexicalDeclContext()->isRecord() && 2254 !New->getLexicalDeclContext()->isRecord())) { 2255 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2256 Diag(Old->getLocation(), diag::note_previous_definition); 2257 return New->setInvalidDecl(); 2258 } 2259 2260 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2261 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2262 Diag(Old->getLocation(), diag::note_previous_definition); 2263 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2264 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2265 Diag(Old->getLocation(), diag::note_previous_definition); 2266 } 2267 2268 // C++ doesn't have tentative definitions, so go right ahead and check here. 2269 const VarDecl *Def; 2270 if (getLangOptions().CPlusPlus && 2271 New->isThisDeclarationADefinition() == VarDecl::Definition && 2272 (Def = Old->getDefinition())) { 2273 Diag(New->getLocation(), diag::err_redefinition) 2274 << New->getDeclName(); 2275 Diag(Def->getLocation(), diag::note_previous_definition); 2276 New->setInvalidDecl(); 2277 return; 2278 } 2279 // c99 6.2.2 P4. 2280 // For an identifier declared with the storage-class specifier extern in a 2281 // scope in which a prior declaration of that identifier is visible, if 2282 // the prior declaration specifies internal or external linkage, the linkage 2283 // of the identifier at the later declaration is the same as the linkage 2284 // specified at the prior declaration. 2285 // FIXME. revisit this code. 2286 if (New->hasExternalStorage() && 2287 Old->getLinkage() == InternalLinkage && 2288 New->getDeclContext() == Old->getDeclContext()) 2289 New->setStorageClass(Old->getStorageClass()); 2290 2291 // Keep a chain of previous declarations. 2292 New->setPreviousDeclaration(Old); 2293 2294 // Inherit access appropriately. 2295 New->setAccess(Old->getAccess()); 2296} 2297 2298/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2299/// no declarator (e.g. "struct foo;") is parsed. 2300Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2301 DeclSpec &DS) { 2302 return ParsedFreeStandingDeclSpec(S, AS, DS, 2303 MultiTemplateParamsArg(*this, 0, 0)); 2304} 2305 2306/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2307/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2308/// parameters to cope with template friend declarations. 2309Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2310 DeclSpec &DS, 2311 MultiTemplateParamsArg TemplateParams) { 2312 Decl *TagD = 0; 2313 TagDecl *Tag = 0; 2314 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2315 DS.getTypeSpecType() == DeclSpec::TST_struct || 2316 DS.getTypeSpecType() == DeclSpec::TST_union || 2317 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2318 TagD = DS.getRepAsDecl(); 2319 2320 if (!TagD) // We probably had an error 2321 return 0; 2322 2323 // Note that the above type specs guarantee that the 2324 // type rep is a Decl, whereas in many of the others 2325 // it's a Type. 2326 if (isa<TagDecl>(TagD)) 2327 Tag = cast<TagDecl>(TagD); 2328 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2329 Tag = CTD->getTemplatedDecl(); 2330 } 2331 2332 if (Tag) 2333 Tag->setFreeStanding(); 2334 2335 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2336 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2337 // or incomplete types shall not be restrict-qualified." 2338 if (TypeQuals & DeclSpec::TQ_restrict) 2339 Diag(DS.getRestrictSpecLoc(), 2340 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2341 << DS.getSourceRange(); 2342 } 2343 2344 if (DS.isConstexprSpecified()) { 2345 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2346 // and definitions of functions and variables. 2347 if (Tag) 2348 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2349 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2350 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2351 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2352 else 2353 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2354 // Don't emit warnings after this error. 2355 return TagD; 2356 } 2357 2358 if (DS.isFriendSpecified()) { 2359 // If we're dealing with a decl but not a TagDecl, assume that 2360 // whatever routines created it handled the friendship aspect. 2361 if (TagD && !Tag) 2362 return 0; 2363 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2364 } 2365 2366 // Track whether we warned about the fact that there aren't any 2367 // declarators. 2368 bool emittedWarning = false; 2369 2370 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2371 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2372 2373 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2374 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2375 if (getLangOptions().CPlusPlus || 2376 Record->getDeclContext()->isRecord()) 2377 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2378 2379 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2380 << DS.getSourceRange(); 2381 emittedWarning = true; 2382 } 2383 } 2384 2385 // Check for Microsoft C extension: anonymous struct. 2386 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2387 CurContext->isRecord() && 2388 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2389 // Handle 2 kinds of anonymous struct: 2390 // struct STRUCT; 2391 // and 2392 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2393 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2394 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2395 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2396 DS.getRepAsType().get()->isStructureType())) { 2397 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2398 << DS.getSourceRange(); 2399 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2400 } 2401 } 2402 2403 if (getLangOptions().CPlusPlus && 2404 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2405 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2406 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2407 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2408 Diag(Enum->getLocation(), diag::ext_no_declarators) 2409 << DS.getSourceRange(); 2410 emittedWarning = true; 2411 } 2412 2413 // Skip all the checks below if we have a type error. 2414 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2415 2416 if (!DS.isMissingDeclaratorOk()) { 2417 // Warn about typedefs of enums without names, since this is an 2418 // extension in both Microsoft and GNU. 2419 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2420 Tag && isa<EnumDecl>(Tag)) { 2421 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2422 << DS.getSourceRange(); 2423 return Tag; 2424 } 2425 2426 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2427 << DS.getSourceRange(); 2428 emittedWarning = true; 2429 } 2430 2431 // We're going to complain about a bunch of spurious specifiers; 2432 // only do this if we're declaring a tag, because otherwise we 2433 // should be getting diag::ext_no_declarators. 2434 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2435 return TagD; 2436 2437 // Note that a linkage-specification sets a storage class, but 2438 // 'extern "C" struct foo;' is actually valid and not theoretically 2439 // useless. 2440 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2441 if (!DS.isExternInLinkageSpec()) 2442 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2443 << DeclSpec::getSpecifierName(scs); 2444 2445 if (DS.isThreadSpecified()) 2446 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2447 if (DS.getTypeQualifiers()) { 2448 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2449 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2450 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2451 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2452 // Restrict is covered above. 2453 } 2454 if (DS.isInlineSpecified()) 2455 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2456 if (DS.isVirtualSpecified()) 2457 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2458 if (DS.isExplicitSpecified()) 2459 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2460 2461 if (DS.isModulePrivateSpecified() && 2462 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2463 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2464 << Tag->getTagKind() 2465 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2466 2467 // FIXME: Warn on useless attributes 2468 2469 return TagD; 2470} 2471 2472/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2473/// builds a statement for it and returns it so it is evaluated. 2474StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2475 StmtResult R; 2476 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2477 Expr *Exp = DS.getRepAsExpr(); 2478 QualType Ty = Exp->getType(); 2479 if (Ty->isPointerType()) { 2480 do 2481 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2482 while (Ty->isPointerType()); 2483 } 2484 if (Ty->isVariableArrayType()) { 2485 R = ActOnExprStmt(MakeFullExpr(Exp)); 2486 } 2487 } 2488 return R; 2489} 2490 2491/// We are trying to inject an anonymous member into the given scope; 2492/// check if there's an existing declaration that can't be overloaded. 2493/// 2494/// \return true if this is a forbidden redeclaration 2495static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2496 Scope *S, 2497 DeclContext *Owner, 2498 DeclarationName Name, 2499 SourceLocation NameLoc, 2500 unsigned diagnostic) { 2501 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2502 Sema::ForRedeclaration); 2503 if (!SemaRef.LookupName(R, S)) return false; 2504 2505 if (R.getAsSingle<TagDecl>()) 2506 return false; 2507 2508 // Pick a representative declaration. 2509 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2510 assert(PrevDecl && "Expected a non-null Decl"); 2511 2512 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2513 return false; 2514 2515 SemaRef.Diag(NameLoc, diagnostic) << Name; 2516 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2517 2518 return true; 2519} 2520 2521/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2522/// anonymous struct or union AnonRecord into the owning context Owner 2523/// and scope S. This routine will be invoked just after we realize 2524/// that an unnamed union or struct is actually an anonymous union or 2525/// struct, e.g., 2526/// 2527/// @code 2528/// union { 2529/// int i; 2530/// float f; 2531/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2532/// // f into the surrounding scope.x 2533/// @endcode 2534/// 2535/// This routine is recursive, injecting the names of nested anonymous 2536/// structs/unions into the owning context and scope as well. 2537static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2538 DeclContext *Owner, 2539 RecordDecl *AnonRecord, 2540 AccessSpecifier AS, 2541 SmallVector<NamedDecl*, 2> &Chaining, 2542 bool MSAnonStruct) { 2543 unsigned diagKind 2544 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2545 : diag::err_anonymous_struct_member_redecl; 2546 2547 bool Invalid = false; 2548 2549 // Look every FieldDecl and IndirectFieldDecl with a name. 2550 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2551 DEnd = AnonRecord->decls_end(); 2552 D != DEnd; ++D) { 2553 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2554 cast<NamedDecl>(*D)->getDeclName()) { 2555 ValueDecl *VD = cast<ValueDecl>(*D); 2556 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2557 VD->getLocation(), diagKind)) { 2558 // C++ [class.union]p2: 2559 // The names of the members of an anonymous union shall be 2560 // distinct from the names of any other entity in the 2561 // scope in which the anonymous union is declared. 2562 Invalid = true; 2563 } else { 2564 // C++ [class.union]p2: 2565 // For the purpose of name lookup, after the anonymous union 2566 // definition, the members of the anonymous union are 2567 // considered to have been defined in the scope in which the 2568 // anonymous union is declared. 2569 unsigned OldChainingSize = Chaining.size(); 2570 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2571 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2572 PE = IF->chain_end(); PI != PE; ++PI) 2573 Chaining.push_back(*PI); 2574 else 2575 Chaining.push_back(VD); 2576 2577 assert(Chaining.size() >= 2); 2578 NamedDecl **NamedChain = 2579 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2580 for (unsigned i = 0; i < Chaining.size(); i++) 2581 NamedChain[i] = Chaining[i]; 2582 2583 IndirectFieldDecl* IndirectField = 2584 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2585 VD->getIdentifier(), VD->getType(), 2586 NamedChain, Chaining.size()); 2587 2588 IndirectField->setAccess(AS); 2589 IndirectField->setImplicit(); 2590 SemaRef.PushOnScopeChains(IndirectField, S); 2591 2592 // That includes picking up the appropriate access specifier. 2593 if (AS != AS_none) IndirectField->setAccess(AS); 2594 2595 Chaining.resize(OldChainingSize); 2596 } 2597 } 2598 } 2599 2600 return Invalid; 2601} 2602 2603/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2604/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2605/// illegal input values are mapped to SC_None. 2606static StorageClass 2607StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2608 switch (StorageClassSpec) { 2609 case DeclSpec::SCS_unspecified: return SC_None; 2610 case DeclSpec::SCS_extern: return SC_Extern; 2611 case DeclSpec::SCS_static: return SC_Static; 2612 case DeclSpec::SCS_auto: return SC_Auto; 2613 case DeclSpec::SCS_register: return SC_Register; 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_mutable: // Fall through. 2617 case DeclSpec::SCS_typedef: return SC_None; 2618 } 2619 llvm_unreachable("unknown storage class specifier"); 2620} 2621 2622/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2623/// a StorageClass. Any error reporting is up to the caller: 2624/// illegal input values are mapped to SC_None. 2625static StorageClass 2626StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2627 switch (StorageClassSpec) { 2628 case DeclSpec::SCS_unspecified: return SC_None; 2629 case DeclSpec::SCS_extern: return SC_Extern; 2630 case DeclSpec::SCS_static: return SC_Static; 2631 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2632 // Illegal SCSs map to None: error reporting is up to the caller. 2633 case DeclSpec::SCS_auto: // Fall through. 2634 case DeclSpec::SCS_mutable: // Fall through. 2635 case DeclSpec::SCS_register: // Fall through. 2636 case DeclSpec::SCS_typedef: return SC_None; 2637 } 2638 llvm_unreachable("unknown storage class specifier"); 2639} 2640 2641/// BuildAnonymousStructOrUnion - Handle the declaration of an 2642/// anonymous structure or union. Anonymous unions are a C++ feature 2643/// (C++ [class.union]) and a GNU C extension; anonymous structures 2644/// are a GNU C and GNU C++ extension. 2645Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2646 AccessSpecifier AS, 2647 RecordDecl *Record) { 2648 DeclContext *Owner = Record->getDeclContext(); 2649 2650 // Diagnose whether this anonymous struct/union is an extension. 2651 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2652 Diag(Record->getLocation(), diag::ext_anonymous_union); 2653 else if (!Record->isUnion()) 2654 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2655 2656 // C and C++ require different kinds of checks for anonymous 2657 // structs/unions. 2658 bool Invalid = false; 2659 if (getLangOptions().CPlusPlus) { 2660 const char* PrevSpec = 0; 2661 unsigned DiagID; 2662 if (Record->isUnion()) { 2663 // C++ [class.union]p6: 2664 // Anonymous unions declared in a named namespace or in the 2665 // global namespace shall be declared static. 2666 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2667 (isa<TranslationUnitDecl>(Owner) || 2668 (isa<NamespaceDecl>(Owner) && 2669 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2670 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2671 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2672 2673 // Recover by adding 'static'. 2674 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2675 PrevSpec, DiagID); 2676 } 2677 // C++ [class.union]p6: 2678 // A storage class is not allowed in a declaration of an 2679 // anonymous union in a class scope. 2680 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2681 isa<RecordDecl>(Owner)) { 2682 Diag(DS.getStorageClassSpecLoc(), 2683 diag::err_anonymous_union_with_storage_spec) 2684 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2685 2686 // Recover by removing the storage specifier. 2687 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2688 SourceLocation(), 2689 PrevSpec, DiagID); 2690 } 2691 } 2692 2693 // Ignore const/volatile/restrict qualifiers. 2694 if (DS.getTypeQualifiers()) { 2695 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2696 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2697 << Record->isUnion() << 0 2698 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2699 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2700 Diag(DS.getVolatileSpecLoc(), 2701 diag::ext_anonymous_struct_union_qualified) 2702 << Record->isUnion() << 1 2703 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2704 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2705 Diag(DS.getRestrictSpecLoc(), 2706 diag::ext_anonymous_struct_union_qualified) 2707 << Record->isUnion() << 2 2708 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2709 2710 DS.ClearTypeQualifiers(); 2711 } 2712 2713 // C++ [class.union]p2: 2714 // The member-specification of an anonymous union shall only 2715 // define non-static data members. [Note: nested types and 2716 // functions cannot be declared within an anonymous union. ] 2717 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2718 MemEnd = Record->decls_end(); 2719 Mem != MemEnd; ++Mem) { 2720 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2721 // C++ [class.union]p3: 2722 // An anonymous union shall not have private or protected 2723 // members (clause 11). 2724 assert(FD->getAccess() != AS_none); 2725 if (FD->getAccess() != AS_public) { 2726 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2727 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2728 Invalid = true; 2729 } 2730 2731 // C++ [class.union]p1 2732 // An object of a class with a non-trivial constructor, a non-trivial 2733 // copy constructor, a non-trivial destructor, or a non-trivial copy 2734 // assignment operator cannot be a member of a union, nor can an 2735 // array of such objects. 2736 if (CheckNontrivialField(FD)) 2737 Invalid = true; 2738 } else if ((*Mem)->isImplicit()) { 2739 // Any implicit members are fine. 2740 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2741 // This is a type that showed up in an 2742 // elaborated-type-specifier inside the anonymous struct or 2743 // union, but which actually declares a type outside of the 2744 // anonymous struct or union. It's okay. 2745 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2746 if (!MemRecord->isAnonymousStructOrUnion() && 2747 MemRecord->getDeclName()) { 2748 // Visual C++ allows type definition in anonymous struct or union. 2749 if (getLangOptions().MicrosoftExt) 2750 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2751 << (int)Record->isUnion(); 2752 else { 2753 // This is a nested type declaration. 2754 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2755 << (int)Record->isUnion(); 2756 Invalid = true; 2757 } 2758 } 2759 } else if (isa<AccessSpecDecl>(*Mem)) { 2760 // Any access specifier is fine. 2761 } else { 2762 // We have something that isn't a non-static data 2763 // member. Complain about it. 2764 unsigned DK = diag::err_anonymous_record_bad_member; 2765 if (isa<TypeDecl>(*Mem)) 2766 DK = diag::err_anonymous_record_with_type; 2767 else if (isa<FunctionDecl>(*Mem)) 2768 DK = diag::err_anonymous_record_with_function; 2769 else if (isa<VarDecl>(*Mem)) 2770 DK = diag::err_anonymous_record_with_static; 2771 2772 // Visual C++ allows type definition in anonymous struct or union. 2773 if (getLangOptions().MicrosoftExt && 2774 DK == diag::err_anonymous_record_with_type) 2775 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2776 << (int)Record->isUnion(); 2777 else { 2778 Diag((*Mem)->getLocation(), DK) 2779 << (int)Record->isUnion(); 2780 Invalid = true; 2781 } 2782 } 2783 } 2784 } 2785 2786 if (!Record->isUnion() && !Owner->isRecord()) { 2787 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2788 << (int)getLangOptions().CPlusPlus; 2789 Invalid = true; 2790 } 2791 2792 // Mock up a declarator. 2793 Declarator Dc(DS, Declarator::MemberContext); 2794 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2795 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2796 2797 // Create a declaration for this anonymous struct/union. 2798 NamedDecl *Anon = 0; 2799 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2800 Anon = FieldDecl::Create(Context, OwningClass, 2801 DS.getSourceRange().getBegin(), 2802 Record->getLocation(), 2803 /*IdentifierInfo=*/0, 2804 Context.getTypeDeclType(Record), 2805 TInfo, 2806 /*BitWidth=*/0, /*Mutable=*/false, 2807 /*HasInit=*/false); 2808 Anon->setAccess(AS); 2809 if (getLangOptions().CPlusPlus) 2810 FieldCollector->Add(cast<FieldDecl>(Anon)); 2811 } else { 2812 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2813 assert(SCSpec != DeclSpec::SCS_typedef && 2814 "Parser allowed 'typedef' as storage class VarDecl."); 2815 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2816 if (SCSpec == DeclSpec::SCS_mutable) { 2817 // mutable can only appear on non-static class members, so it's always 2818 // an error here 2819 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2820 Invalid = true; 2821 SC = SC_None; 2822 } 2823 SCSpec = DS.getStorageClassSpecAsWritten(); 2824 VarDecl::StorageClass SCAsWritten 2825 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2826 2827 Anon = VarDecl::Create(Context, Owner, 2828 DS.getSourceRange().getBegin(), 2829 Record->getLocation(), /*IdentifierInfo=*/0, 2830 Context.getTypeDeclType(Record), 2831 TInfo, SC, SCAsWritten); 2832 2833 // Default-initialize the implicit variable. This initialization will be 2834 // trivial in almost all cases, except if a union member has an in-class 2835 // initializer: 2836 // union { int n = 0; }; 2837 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2838 } 2839 Anon->setImplicit(); 2840 2841 // Add the anonymous struct/union object to the current 2842 // context. We'll be referencing this object when we refer to one of 2843 // its members. 2844 Owner->addDecl(Anon); 2845 2846 // Inject the members of the anonymous struct/union into the owning 2847 // context and into the identifier resolver chain for name lookup 2848 // purposes. 2849 SmallVector<NamedDecl*, 2> Chain; 2850 Chain.push_back(Anon); 2851 2852 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2853 Chain, false)) 2854 Invalid = true; 2855 2856 // Mark this as an anonymous struct/union type. Note that we do not 2857 // do this until after we have already checked and injected the 2858 // members of this anonymous struct/union type, because otherwise 2859 // the members could be injected twice: once by DeclContext when it 2860 // builds its lookup table, and once by 2861 // InjectAnonymousStructOrUnionMembers. 2862 Record->setAnonymousStructOrUnion(true); 2863 2864 if (Invalid) 2865 Anon->setInvalidDecl(); 2866 2867 return Anon; 2868} 2869 2870/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2871/// Microsoft C anonymous structure. 2872/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2873/// Example: 2874/// 2875/// struct A { int a; }; 2876/// struct B { struct A; int b; }; 2877/// 2878/// void foo() { 2879/// B var; 2880/// var.a = 3; 2881/// } 2882/// 2883Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2884 RecordDecl *Record) { 2885 2886 // If there is no Record, get the record via the typedef. 2887 if (!Record) 2888 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2889 2890 // Mock up a declarator. 2891 Declarator Dc(DS, Declarator::TypeNameContext); 2892 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2893 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2894 2895 // Create a declaration for this anonymous struct. 2896 NamedDecl* Anon = FieldDecl::Create(Context, 2897 cast<RecordDecl>(CurContext), 2898 DS.getSourceRange().getBegin(), 2899 DS.getSourceRange().getBegin(), 2900 /*IdentifierInfo=*/0, 2901 Context.getTypeDeclType(Record), 2902 TInfo, 2903 /*BitWidth=*/0, /*Mutable=*/false, 2904 /*HasInit=*/false); 2905 Anon->setImplicit(); 2906 2907 // Add the anonymous struct object to the current context. 2908 CurContext->addDecl(Anon); 2909 2910 // Inject the members of the anonymous struct into the current 2911 // context and into the identifier resolver chain for name lookup 2912 // purposes. 2913 SmallVector<NamedDecl*, 2> Chain; 2914 Chain.push_back(Anon); 2915 2916 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2917 Record->getDefinition(), 2918 AS_none, Chain, true)) 2919 Anon->setInvalidDecl(); 2920 2921 return Anon; 2922} 2923 2924/// GetNameForDeclarator - Determine the full declaration name for the 2925/// given Declarator. 2926DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2927 return GetNameFromUnqualifiedId(D.getName()); 2928} 2929 2930/// \brief Retrieves the declaration name from a parsed unqualified-id. 2931DeclarationNameInfo 2932Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2933 DeclarationNameInfo NameInfo; 2934 NameInfo.setLoc(Name.StartLocation); 2935 2936 switch (Name.getKind()) { 2937 2938 case UnqualifiedId::IK_ImplicitSelfParam: 2939 case UnqualifiedId::IK_Identifier: 2940 NameInfo.setName(Name.Identifier); 2941 NameInfo.setLoc(Name.StartLocation); 2942 return NameInfo; 2943 2944 case UnqualifiedId::IK_OperatorFunctionId: 2945 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2946 Name.OperatorFunctionId.Operator)); 2947 NameInfo.setLoc(Name.StartLocation); 2948 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2949 = Name.OperatorFunctionId.SymbolLocations[0]; 2950 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2951 = Name.EndLocation.getRawEncoding(); 2952 return NameInfo; 2953 2954 case UnqualifiedId::IK_LiteralOperatorId: 2955 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2956 Name.Identifier)); 2957 NameInfo.setLoc(Name.StartLocation); 2958 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2959 return NameInfo; 2960 2961 case UnqualifiedId::IK_ConversionFunctionId: { 2962 TypeSourceInfo *TInfo; 2963 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2964 if (Ty.isNull()) 2965 return DeclarationNameInfo(); 2966 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2967 Context.getCanonicalType(Ty))); 2968 NameInfo.setLoc(Name.StartLocation); 2969 NameInfo.setNamedTypeInfo(TInfo); 2970 return NameInfo; 2971 } 2972 2973 case UnqualifiedId::IK_ConstructorName: { 2974 TypeSourceInfo *TInfo; 2975 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2976 if (Ty.isNull()) 2977 return DeclarationNameInfo(); 2978 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2979 Context.getCanonicalType(Ty))); 2980 NameInfo.setLoc(Name.StartLocation); 2981 NameInfo.setNamedTypeInfo(TInfo); 2982 return NameInfo; 2983 } 2984 2985 case UnqualifiedId::IK_ConstructorTemplateId: { 2986 // In well-formed code, we can only have a constructor 2987 // template-id that refers to the current context, so go there 2988 // to find the actual type being constructed. 2989 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2990 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2991 return DeclarationNameInfo(); 2992 2993 // Determine the type of the class being constructed. 2994 QualType CurClassType = Context.getTypeDeclType(CurClass); 2995 2996 // FIXME: Check two things: that the template-id names the same type as 2997 // CurClassType, and that the template-id does not occur when the name 2998 // was qualified. 2999 3000 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3001 Context.getCanonicalType(CurClassType))); 3002 NameInfo.setLoc(Name.StartLocation); 3003 // FIXME: should we retrieve TypeSourceInfo? 3004 NameInfo.setNamedTypeInfo(0); 3005 return NameInfo; 3006 } 3007 3008 case UnqualifiedId::IK_DestructorName: { 3009 TypeSourceInfo *TInfo; 3010 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3011 if (Ty.isNull()) 3012 return DeclarationNameInfo(); 3013 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3014 Context.getCanonicalType(Ty))); 3015 NameInfo.setLoc(Name.StartLocation); 3016 NameInfo.setNamedTypeInfo(TInfo); 3017 return NameInfo; 3018 } 3019 3020 case UnqualifiedId::IK_TemplateId: { 3021 TemplateName TName = Name.TemplateId->Template.get(); 3022 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3023 return Context.getNameForTemplate(TName, TNameLoc); 3024 } 3025 3026 } // switch (Name.getKind()) 3027 3028 llvm_unreachable("Unknown name kind"); 3029} 3030 3031static QualType getCoreType(QualType Ty) { 3032 do { 3033 if (Ty->isPointerType() || Ty->isReferenceType()) 3034 Ty = Ty->getPointeeType(); 3035 else if (Ty->isArrayType()) 3036 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3037 else 3038 return Ty.withoutLocalFastQualifiers(); 3039 } while (true); 3040} 3041 3042/// hasSimilarParameters - Determine whether the C++ functions Declaration 3043/// and Definition have "nearly" matching parameters. This heuristic is 3044/// used to improve diagnostics in the case where an out-of-line function 3045/// definition doesn't match any declaration within the class or namespace. 3046/// Also sets Params to the list of indices to the parameters that differ 3047/// between the declaration and the definition. If hasSimilarParameters 3048/// returns true and Params is empty, then all of the parameters match. 3049static bool hasSimilarParameters(ASTContext &Context, 3050 FunctionDecl *Declaration, 3051 FunctionDecl *Definition, 3052 llvm::SmallVectorImpl<unsigned> &Params) { 3053 Params.clear(); 3054 if (Declaration->param_size() != Definition->param_size()) 3055 return false; 3056 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3057 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3058 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3059 3060 // The parameter types are identical 3061 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3062 continue; 3063 3064 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3065 QualType DefParamBaseTy = getCoreType(DefParamTy); 3066 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3067 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3068 3069 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3070 (DeclTyName && DeclTyName == DefTyName)) 3071 Params.push_back(Idx); 3072 else // The two parameters aren't even close 3073 return false; 3074 } 3075 3076 return true; 3077} 3078 3079/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3080/// declarator needs to be rebuilt in the current instantiation. 3081/// Any bits of declarator which appear before the name are valid for 3082/// consideration here. That's specifically the type in the decl spec 3083/// and the base type in any member-pointer chunks. 3084static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3085 DeclarationName Name) { 3086 // The types we specifically need to rebuild are: 3087 // - typenames, typeofs, and decltypes 3088 // - types which will become injected class names 3089 // Of course, we also need to rebuild any type referencing such a 3090 // type. It's safest to just say "dependent", but we call out a 3091 // few cases here. 3092 3093 DeclSpec &DS = D.getMutableDeclSpec(); 3094 switch (DS.getTypeSpecType()) { 3095 case DeclSpec::TST_typename: 3096 case DeclSpec::TST_typeofType: 3097 case DeclSpec::TST_decltype: 3098 case DeclSpec::TST_underlyingType: 3099 case DeclSpec::TST_atomic: { 3100 // Grab the type from the parser. 3101 TypeSourceInfo *TSI = 0; 3102 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3103 if (T.isNull() || !T->isDependentType()) break; 3104 3105 // Make sure there's a type source info. This isn't really much 3106 // of a waste; most dependent types should have type source info 3107 // attached already. 3108 if (!TSI) 3109 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3110 3111 // Rebuild the type in the current instantiation. 3112 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3113 if (!TSI) return true; 3114 3115 // Store the new type back in the decl spec. 3116 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3117 DS.UpdateTypeRep(LocType); 3118 break; 3119 } 3120 3121 case DeclSpec::TST_typeofExpr: { 3122 Expr *E = DS.getRepAsExpr(); 3123 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3124 if (Result.isInvalid()) return true; 3125 DS.UpdateExprRep(Result.get()); 3126 break; 3127 } 3128 3129 default: 3130 // Nothing to do for these decl specs. 3131 break; 3132 } 3133 3134 // It doesn't matter what order we do this in. 3135 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3136 DeclaratorChunk &Chunk = D.getTypeObject(I); 3137 3138 // The only type information in the declarator which can come 3139 // before the declaration name is the base type of a member 3140 // pointer. 3141 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3142 continue; 3143 3144 // Rebuild the scope specifier in-place. 3145 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3146 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3147 return true; 3148 } 3149 3150 return false; 3151} 3152 3153Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3154 D.setFunctionDefinitionKind(FDK_Declaration); 3155 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3156} 3157 3158/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3159/// If T is the name of a class, then each of the following shall have a 3160/// name different from T: 3161/// - every static data member of class T; 3162/// - every member function of class T 3163/// - every member of class T that is itself a type; 3164/// \returns true if the declaration name violates these rules. 3165bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3166 DeclarationNameInfo NameInfo) { 3167 DeclarationName Name = NameInfo.getName(); 3168 3169 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3170 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3171 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3172 return true; 3173 } 3174 3175 return false; 3176} 3177 3178Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3179 MultiTemplateParamsArg TemplateParamLists) { 3180 // TODO: consider using NameInfo for diagnostic. 3181 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3182 DeclarationName Name = NameInfo.getName(); 3183 3184 // All of these full declarators require an identifier. If it doesn't have 3185 // one, the ParsedFreeStandingDeclSpec action should be used. 3186 if (!Name) { 3187 if (!D.isInvalidType()) // Reject this if we think it is valid. 3188 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3189 diag::err_declarator_need_ident) 3190 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3191 return 0; 3192 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3193 return 0; 3194 3195 // The scope passed in may not be a decl scope. Zip up the scope tree until 3196 // we find one that is. 3197 while ((S->getFlags() & Scope::DeclScope) == 0 || 3198 (S->getFlags() & Scope::TemplateParamScope) != 0) 3199 S = S->getParent(); 3200 3201 DeclContext *DC = CurContext; 3202 if (D.getCXXScopeSpec().isInvalid()) 3203 D.setInvalidType(); 3204 else if (D.getCXXScopeSpec().isSet()) { 3205 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3206 UPPC_DeclarationQualifier)) 3207 return 0; 3208 3209 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3210 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3211 if (!DC) { 3212 // If we could not compute the declaration context, it's because the 3213 // declaration context is dependent but does not refer to a class, 3214 // class template, or class template partial specialization. Complain 3215 // and return early, to avoid the coming semantic disaster. 3216 Diag(D.getIdentifierLoc(), 3217 diag::err_template_qualified_declarator_no_match) 3218 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3219 << D.getCXXScopeSpec().getRange(); 3220 return 0; 3221 } 3222 bool IsDependentContext = DC->isDependentContext(); 3223 3224 if (!IsDependentContext && 3225 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3226 return 0; 3227 3228 if (isa<CXXRecordDecl>(DC)) { 3229 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3230 Diag(D.getIdentifierLoc(), 3231 diag::err_member_def_undefined_record) 3232 << Name << DC << D.getCXXScopeSpec().getRange(); 3233 D.setInvalidType(); 3234 } else if (isa<CXXRecordDecl>(CurContext) && 3235 !D.getDeclSpec().isFriendSpecified()) { 3236 // The user provided a superfluous scope specifier inside a class 3237 // definition: 3238 // 3239 // class X { 3240 // void X::f(); 3241 // }; 3242 if (CurContext->Equals(DC)) { 3243 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3244 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3245 } else { 3246 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3247 << Name << D.getCXXScopeSpec().getRange(); 3248 3249 // C++ constructors and destructors with incorrect scopes can break 3250 // our AST invariants by having the wrong underlying types. If 3251 // that's the case, then drop this declaration entirely. 3252 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3253 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3254 !Context.hasSameType(Name.getCXXNameType(), 3255 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3256 return 0; 3257 } 3258 3259 // Pretend that this qualifier was not here. 3260 D.getCXXScopeSpec().clear(); 3261 } 3262 } 3263 3264 // Check whether we need to rebuild the type of the given 3265 // declaration in the current instantiation. 3266 if (EnteringContext && IsDependentContext && 3267 TemplateParamLists.size() != 0) { 3268 ContextRAII SavedContext(*this, DC); 3269 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3270 D.setInvalidType(); 3271 } 3272 } 3273 3274 if (DiagnoseClassNameShadow(DC, NameInfo)) 3275 // If this is a typedef, we'll end up spewing multiple diagnostics. 3276 // Just return early; it's safer. 3277 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3278 return 0; 3279 3280 NamedDecl *New; 3281 3282 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3283 QualType R = TInfo->getType(); 3284 3285 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3286 UPPC_DeclarationType)) 3287 D.setInvalidType(); 3288 3289 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3290 ForRedeclaration); 3291 3292 // See if this is a redefinition of a variable in the same scope. 3293 if (!D.getCXXScopeSpec().isSet()) { 3294 bool IsLinkageLookup = false; 3295 3296 // If the declaration we're planning to build will be a function 3297 // or object with linkage, then look for another declaration with 3298 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3299 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3300 /* Do nothing*/; 3301 else if (R->isFunctionType()) { 3302 if (CurContext->isFunctionOrMethod() || 3303 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3304 IsLinkageLookup = true; 3305 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3306 IsLinkageLookup = true; 3307 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3308 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3309 IsLinkageLookup = true; 3310 3311 if (IsLinkageLookup) 3312 Previous.clear(LookupRedeclarationWithLinkage); 3313 3314 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3315 } else { // Something like "int foo::x;" 3316 LookupQualifiedName(Previous, DC); 3317 3318 // Don't consider using declarations as previous declarations for 3319 // out-of-line members. 3320 RemoveUsingDecls(Previous); 3321 3322 // C++ 7.3.1.2p2: 3323 // Members (including explicit specializations of templates) of a named 3324 // namespace can also be defined outside that namespace by explicit 3325 // qualification of the name being defined, provided that the entity being 3326 // defined was already declared in the namespace and the definition appears 3327 // after the point of declaration in a namespace that encloses the 3328 // declarations namespace. 3329 // 3330 // Note that we only check the context at this point. We don't yet 3331 // have enough information to make sure that PrevDecl is actually 3332 // the declaration we want to match. For example, given: 3333 // 3334 // class X { 3335 // void f(); 3336 // void f(float); 3337 // }; 3338 // 3339 // void X::f(int) { } // ill-formed 3340 // 3341 // In this case, PrevDecl will point to the overload set 3342 // containing the two f's declared in X, but neither of them 3343 // matches. 3344 3345 // First check whether we named the global scope. 3346 if (isa<TranslationUnitDecl>(DC)) { 3347 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3348 << Name << D.getCXXScopeSpec().getRange(); 3349 } else { 3350 DeclContext *Cur = CurContext; 3351 while (isa<LinkageSpecDecl>(Cur)) 3352 Cur = Cur->getParent(); 3353 if (!Cur->Encloses(DC)) { 3354 // The qualifying scope doesn't enclose the original declaration. 3355 // Emit diagnostic based on current scope. 3356 SourceLocation L = D.getIdentifierLoc(); 3357 SourceRange R = D.getCXXScopeSpec().getRange(); 3358 if (isa<FunctionDecl>(Cur)) 3359 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3360 else 3361 Diag(L, diag::err_invalid_declarator_scope) 3362 << Name << cast<NamedDecl>(DC) << R; 3363 D.setInvalidType(); 3364 } 3365 } 3366 } 3367 3368 if (Previous.isSingleResult() && 3369 Previous.getFoundDecl()->isTemplateParameter()) { 3370 // Maybe we will complain about the shadowed template parameter. 3371 if (!D.isInvalidType()) 3372 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3373 Previous.getFoundDecl()); 3374 3375 // Just pretend that we didn't see the previous declaration. 3376 Previous.clear(); 3377 } 3378 3379 // In C++, the previous declaration we find might be a tag type 3380 // (class or enum). In this case, the new declaration will hide the 3381 // tag type. Note that this does does not apply if we're declaring a 3382 // typedef (C++ [dcl.typedef]p4). 3383 if (Previous.isSingleTagDecl() && 3384 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3385 Previous.clear(); 3386 3387 bool AddToScope = true; 3388 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3389 if (TemplateParamLists.size()) { 3390 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3391 return 0; 3392 } 3393 3394 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3395 } else if (R->isFunctionType()) { 3396 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3397 move(TemplateParamLists), 3398 AddToScope); 3399 } else { 3400 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3401 move(TemplateParamLists)); 3402 } 3403 3404 if (New == 0) 3405 return 0; 3406 3407 // If this has an identifier and is not an invalid redeclaration or 3408 // function template specialization, add it to the scope stack. 3409 if (New->getDeclName() && AddToScope && 3410 !(D.isRedeclaration() && New->isInvalidDecl())) 3411 PushOnScopeChains(New, S); 3412 3413 return New; 3414} 3415 3416/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3417/// types into constant array types in certain situations which would otherwise 3418/// be errors (for GCC compatibility). 3419static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3420 ASTContext &Context, 3421 bool &SizeIsNegative, 3422 llvm::APSInt &Oversized) { 3423 // This method tries to turn a variable array into a constant 3424 // array even when the size isn't an ICE. This is necessary 3425 // for compatibility with code that depends on gcc's buggy 3426 // constant expression folding, like struct {char x[(int)(char*)2];} 3427 SizeIsNegative = false; 3428 Oversized = 0; 3429 3430 if (T->isDependentType()) 3431 return QualType(); 3432 3433 QualifierCollector Qs; 3434 const Type *Ty = Qs.strip(T); 3435 3436 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3437 QualType Pointee = PTy->getPointeeType(); 3438 QualType FixedType = 3439 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3440 Oversized); 3441 if (FixedType.isNull()) return FixedType; 3442 FixedType = Context.getPointerType(FixedType); 3443 return Qs.apply(Context, FixedType); 3444 } 3445 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3446 QualType Inner = PTy->getInnerType(); 3447 QualType FixedType = 3448 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3449 Oversized); 3450 if (FixedType.isNull()) return FixedType; 3451 FixedType = Context.getParenType(FixedType); 3452 return Qs.apply(Context, FixedType); 3453 } 3454 3455 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3456 if (!VLATy) 3457 return QualType(); 3458 // FIXME: We should probably handle this case 3459 if (VLATy->getElementType()->isVariablyModifiedType()) 3460 return QualType(); 3461 3462 Expr::EvalResult EvalResult; 3463 if (!VLATy->getSizeExpr() || 3464 !VLATy->getSizeExpr()->EvaluateAsRValue(EvalResult, Context) || 3465 !EvalResult.Val.isInt()) 3466 return QualType(); 3467 3468 // Check whether the array size is negative. 3469 llvm::APSInt &Res = EvalResult.Val.getInt(); 3470 if (Res.isSigned() && Res.isNegative()) { 3471 SizeIsNegative = true; 3472 return QualType(); 3473 } 3474 3475 // Check whether the array is too large to be addressed. 3476 unsigned ActiveSizeBits 3477 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3478 Res); 3479 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3480 Oversized = Res; 3481 return QualType(); 3482 } 3483 3484 return Context.getConstantArrayType(VLATy->getElementType(), 3485 Res, ArrayType::Normal, 0); 3486} 3487 3488/// \brief Register the given locally-scoped external C declaration so 3489/// that it can be found later for redeclarations 3490void 3491Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3492 const LookupResult &Previous, 3493 Scope *S) { 3494 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3495 "Decl is not a locally-scoped decl!"); 3496 // Note that we have a locally-scoped external with this name. 3497 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3498 3499 if (!Previous.isSingleResult()) 3500 return; 3501 3502 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3503 3504 // If there was a previous declaration of this variable, it may be 3505 // in our identifier chain. Update the identifier chain with the new 3506 // declaration. 3507 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3508 // The previous declaration was found on the identifer resolver 3509 // chain, so remove it from its scope. 3510 3511 if (S->isDeclScope(PrevDecl)) { 3512 // Special case for redeclarations in the SAME scope. 3513 // Because this declaration is going to be added to the identifier chain 3514 // later, we should temporarily take it OFF the chain. 3515 IdResolver.RemoveDecl(ND); 3516 3517 } else { 3518 // Find the scope for the original declaration. 3519 while (S && !S->isDeclScope(PrevDecl)) 3520 S = S->getParent(); 3521 } 3522 3523 if (S) 3524 S->RemoveDecl(PrevDecl); 3525 } 3526} 3527 3528llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3529Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3530 if (ExternalSource) { 3531 // Load locally-scoped external decls from the external source. 3532 SmallVector<NamedDecl *, 4> Decls; 3533 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3534 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3535 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3536 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3537 if (Pos == LocallyScopedExternalDecls.end()) 3538 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3539 } 3540 } 3541 3542 return LocallyScopedExternalDecls.find(Name); 3543} 3544 3545/// \brief Diagnose function specifiers on a declaration of an identifier that 3546/// does not identify a function. 3547void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3548 // FIXME: We should probably indicate the identifier in question to avoid 3549 // confusion for constructs like "inline int a(), b;" 3550 if (D.getDeclSpec().isInlineSpecified()) 3551 Diag(D.getDeclSpec().getInlineSpecLoc(), 3552 diag::err_inline_non_function); 3553 3554 if (D.getDeclSpec().isVirtualSpecified()) 3555 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3556 diag::err_virtual_non_function); 3557 3558 if (D.getDeclSpec().isExplicitSpecified()) 3559 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3560 diag::err_explicit_non_function); 3561} 3562 3563NamedDecl* 3564Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3565 TypeSourceInfo *TInfo, LookupResult &Previous) { 3566 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3567 if (D.getCXXScopeSpec().isSet()) { 3568 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3569 << D.getCXXScopeSpec().getRange(); 3570 D.setInvalidType(); 3571 // Pretend we didn't see the scope specifier. 3572 DC = CurContext; 3573 Previous.clear(); 3574 } 3575 3576 if (getLangOptions().CPlusPlus) { 3577 // Check that there are no default arguments (C++ only). 3578 CheckExtraCXXDefaultArguments(D); 3579 } 3580 3581 DiagnoseFunctionSpecifiers(D); 3582 3583 if (D.getDeclSpec().isThreadSpecified()) 3584 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3585 if (D.getDeclSpec().isConstexprSpecified()) 3586 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3587 << 1; 3588 3589 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3590 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3591 << D.getName().getSourceRange(); 3592 return 0; 3593 } 3594 3595 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3596 if (!NewTD) return 0; 3597 3598 // Handle attributes prior to checking for duplicates in MergeVarDecl 3599 ProcessDeclAttributes(S, NewTD, D); 3600 3601 CheckTypedefForVariablyModifiedType(S, NewTD); 3602 3603 bool Redeclaration = D.isRedeclaration(); 3604 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3605 D.setRedeclaration(Redeclaration); 3606 return ND; 3607} 3608 3609void 3610Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3611 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3612 // then it shall have block scope. 3613 // Note that variably modified types must be fixed before merging the decl so 3614 // that redeclarations will match. 3615 QualType T = NewTD->getUnderlyingType(); 3616 if (T->isVariablyModifiedType()) { 3617 getCurFunction()->setHasBranchProtectedScope(); 3618 3619 if (S->getFnParent() == 0) { 3620 bool SizeIsNegative; 3621 llvm::APSInt Oversized; 3622 QualType FixedTy = 3623 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3624 Oversized); 3625 if (!FixedTy.isNull()) { 3626 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3627 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3628 } else { 3629 if (SizeIsNegative) 3630 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3631 else if (T->isVariableArrayType()) 3632 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3633 else if (Oversized.getBoolValue()) 3634 Diag(NewTD->getLocation(), diag::err_array_too_large) 3635 << Oversized.toString(10); 3636 else 3637 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3638 NewTD->setInvalidDecl(); 3639 } 3640 } 3641 } 3642} 3643 3644 3645/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3646/// declares a typedef-name, either using the 'typedef' type specifier or via 3647/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3648NamedDecl* 3649Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3650 LookupResult &Previous, bool &Redeclaration) { 3651 // Merge the decl with the existing one if appropriate. If the decl is 3652 // in an outer scope, it isn't the same thing. 3653 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3654 /*ExplicitInstantiationOrSpecialization=*/false); 3655 if (!Previous.empty()) { 3656 Redeclaration = true; 3657 MergeTypedefNameDecl(NewTD, Previous); 3658 } 3659 3660 // If this is the C FILE type, notify the AST context. 3661 if (IdentifierInfo *II = NewTD->getIdentifier()) 3662 if (!NewTD->isInvalidDecl() && 3663 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3664 if (II->isStr("FILE")) 3665 Context.setFILEDecl(NewTD); 3666 else if (II->isStr("jmp_buf")) 3667 Context.setjmp_bufDecl(NewTD); 3668 else if (II->isStr("sigjmp_buf")) 3669 Context.setsigjmp_bufDecl(NewTD); 3670 else if (II->isStr("ucontext_t")) 3671 Context.setucontext_tDecl(NewTD); 3672 else if (II->isStr("__builtin_va_list")) 3673 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3674 } 3675 3676 return NewTD; 3677} 3678 3679/// \brief Determines whether the given declaration is an out-of-scope 3680/// previous declaration. 3681/// 3682/// This routine should be invoked when name lookup has found a 3683/// previous declaration (PrevDecl) that is not in the scope where a 3684/// new declaration by the same name is being introduced. If the new 3685/// declaration occurs in a local scope, previous declarations with 3686/// linkage may still be considered previous declarations (C99 3687/// 6.2.2p4-5, C++ [basic.link]p6). 3688/// 3689/// \param PrevDecl the previous declaration found by name 3690/// lookup 3691/// 3692/// \param DC the context in which the new declaration is being 3693/// declared. 3694/// 3695/// \returns true if PrevDecl is an out-of-scope previous declaration 3696/// for a new delcaration with the same name. 3697static bool 3698isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3699 ASTContext &Context) { 3700 if (!PrevDecl) 3701 return false; 3702 3703 if (!PrevDecl->hasLinkage()) 3704 return false; 3705 3706 if (Context.getLangOptions().CPlusPlus) { 3707 // C++ [basic.link]p6: 3708 // If there is a visible declaration of an entity with linkage 3709 // having the same name and type, ignoring entities declared 3710 // outside the innermost enclosing namespace scope, the block 3711 // scope declaration declares that same entity and receives the 3712 // linkage of the previous declaration. 3713 DeclContext *OuterContext = DC->getRedeclContext(); 3714 if (!OuterContext->isFunctionOrMethod()) 3715 // This rule only applies to block-scope declarations. 3716 return false; 3717 3718 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3719 if (PrevOuterContext->isRecord()) 3720 // We found a member function: ignore it. 3721 return false; 3722 3723 // Find the innermost enclosing namespace for the new and 3724 // previous declarations. 3725 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3726 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3727 3728 // The previous declaration is in a different namespace, so it 3729 // isn't the same function. 3730 if (!OuterContext->Equals(PrevOuterContext)) 3731 return false; 3732 } 3733 3734 return true; 3735} 3736 3737static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3738 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3739 if (!SS.isSet()) return; 3740 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3741} 3742 3743bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3744 QualType type = decl->getType(); 3745 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3746 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3747 // Various kinds of declaration aren't allowed to be __autoreleasing. 3748 unsigned kind = -1U; 3749 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3750 if (var->hasAttr<BlocksAttr>()) 3751 kind = 0; // __block 3752 else if (!var->hasLocalStorage()) 3753 kind = 1; // global 3754 } else if (isa<ObjCIvarDecl>(decl)) { 3755 kind = 3; // ivar 3756 } else if (isa<FieldDecl>(decl)) { 3757 kind = 2; // field 3758 } 3759 3760 if (kind != -1U) { 3761 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3762 << kind; 3763 } 3764 } else if (lifetime == Qualifiers::OCL_None) { 3765 // Try to infer lifetime. 3766 if (!type->isObjCLifetimeType()) 3767 return false; 3768 3769 lifetime = type->getObjCARCImplicitLifetime(); 3770 type = Context.getLifetimeQualifiedType(type, lifetime); 3771 decl->setType(type); 3772 } 3773 3774 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3775 // Thread-local variables cannot have lifetime. 3776 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3777 var->isThreadSpecified()) { 3778 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3779 << var->getType(); 3780 return true; 3781 } 3782 } 3783 3784 return false; 3785} 3786 3787NamedDecl* 3788Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3789 TypeSourceInfo *TInfo, LookupResult &Previous, 3790 MultiTemplateParamsArg TemplateParamLists) { 3791 QualType R = TInfo->getType(); 3792 DeclarationName Name = GetNameForDeclarator(D).getName(); 3793 3794 // Check that there are no default arguments (C++ only). 3795 if (getLangOptions().CPlusPlus) 3796 CheckExtraCXXDefaultArguments(D); 3797 3798 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3799 assert(SCSpec != DeclSpec::SCS_typedef && 3800 "Parser allowed 'typedef' as storage class VarDecl."); 3801 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3802 if (SCSpec == DeclSpec::SCS_mutable) { 3803 // mutable can only appear on non-static class members, so it's always 3804 // an error here 3805 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3806 D.setInvalidType(); 3807 SC = SC_None; 3808 } 3809 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3810 VarDecl::StorageClass SCAsWritten 3811 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3812 3813 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3814 if (!II) { 3815 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3816 << Name; 3817 return 0; 3818 } 3819 3820 DiagnoseFunctionSpecifiers(D); 3821 3822 if (!DC->isRecord() && S->getFnParent() == 0) { 3823 // C99 6.9p2: The storage-class specifiers auto and register shall not 3824 // appear in the declaration specifiers in an external declaration. 3825 if (SC == SC_Auto || SC == SC_Register) { 3826 3827 // If this is a register variable with an asm label specified, then this 3828 // is a GNU extension. 3829 if (SC == SC_Register && D.getAsmLabel()) 3830 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3831 else 3832 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3833 D.setInvalidType(); 3834 } 3835 } 3836 3837 if (getLangOptions().OpenCL) { 3838 // Set up the special work-group-local storage class for variables in the 3839 // OpenCL __local address space. 3840 if (R.getAddressSpace() == LangAS::opencl_local) 3841 SC = SC_OpenCLWorkGroupLocal; 3842 } 3843 3844 bool isExplicitSpecialization = false; 3845 VarDecl *NewVD; 3846 if (!getLangOptions().CPlusPlus) { 3847 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3848 D.getIdentifierLoc(), II, 3849 R, TInfo, SC, SCAsWritten); 3850 3851 if (D.isInvalidType()) 3852 NewVD->setInvalidDecl(); 3853 } else { 3854 if (DC->isRecord() && !CurContext->isRecord()) { 3855 // This is an out-of-line definition of a static data member. 3856 if (SC == SC_Static) { 3857 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3858 diag::err_static_out_of_line) 3859 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3860 } else if (SC == SC_None) 3861 SC = SC_Static; 3862 } 3863 if (SC == SC_Static) { 3864 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3865 if (RD->isLocalClass()) 3866 Diag(D.getIdentifierLoc(), 3867 diag::err_static_data_member_not_allowed_in_local_class) 3868 << Name << RD->getDeclName(); 3869 3870 // C++ [class.union]p1: If a union contains a static data member, 3871 // the program is ill-formed. 3872 // 3873 // We also disallow static data members in anonymous structs. 3874 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3875 Diag(D.getIdentifierLoc(), 3876 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3877 << Name << RD->isUnion(); 3878 } 3879 } 3880 3881 // Match up the template parameter lists with the scope specifier, then 3882 // determine whether we have a template or a template specialization. 3883 isExplicitSpecialization = false; 3884 bool Invalid = false; 3885 if (TemplateParameterList *TemplateParams 3886 = MatchTemplateParametersToScopeSpecifier( 3887 D.getDeclSpec().getSourceRange().getBegin(), 3888 D.getIdentifierLoc(), 3889 D.getCXXScopeSpec(), 3890 TemplateParamLists.get(), 3891 TemplateParamLists.size(), 3892 /*never a friend*/ false, 3893 isExplicitSpecialization, 3894 Invalid)) { 3895 if (TemplateParams->size() > 0) { 3896 // There is no such thing as a variable template. 3897 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3898 << II 3899 << SourceRange(TemplateParams->getTemplateLoc(), 3900 TemplateParams->getRAngleLoc()); 3901 return 0; 3902 } else { 3903 // There is an extraneous 'template<>' for this variable. Complain 3904 // about it, but allow the declaration of the variable. 3905 Diag(TemplateParams->getTemplateLoc(), 3906 diag::err_template_variable_noparams) 3907 << II 3908 << SourceRange(TemplateParams->getTemplateLoc(), 3909 TemplateParams->getRAngleLoc()); 3910 } 3911 } 3912 3913 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3914 D.getIdentifierLoc(), II, 3915 R, TInfo, SC, SCAsWritten); 3916 3917 // If this decl has an auto type in need of deduction, make a note of the 3918 // Decl so we can diagnose uses of it in its own initializer. 3919 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3920 R->getContainedAutoType()) 3921 ParsingInitForAutoVars.insert(NewVD); 3922 3923 if (D.isInvalidType() || Invalid) 3924 NewVD->setInvalidDecl(); 3925 3926 SetNestedNameSpecifier(NewVD, D); 3927 3928 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3929 NewVD->setTemplateParameterListsInfo(Context, 3930 TemplateParamLists.size(), 3931 TemplateParamLists.release()); 3932 } 3933 3934 if (D.getDeclSpec().isConstexprSpecified()) { 3935 // FIXME: once we know whether there's an initializer, apply this to 3936 // static data members too. 3937 if (!NewVD->isStaticDataMember() && 3938 !NewVD->isThisDeclarationADefinition()) { 3939 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3940 // of a variable. Suggest replacing it with 'const' if appropriate. 3941 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3942 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3943 // If the declarator is complex, we need to move the keyword to the 3944 // innermost chunk as we switch it from 'constexpr' to 'const'. 3945 int Kind = DeclaratorChunk::Paren; 3946 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3947 Kind = D.getTypeObject(I).Kind; 3948 if (Kind != DeclaratorChunk::Paren) 3949 break; 3950 } 3951 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3952 Kind == DeclaratorChunk::Reference) 3953 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3954 << FixItHint::CreateRemoval(ConstexprRange); 3955 else if (Kind == DeclaratorChunk::Paren) 3956 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3957 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3958 else 3959 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3960 << FixItHint::CreateRemoval(ConstexprRange) 3961 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3962 } else { 3963 NewVD->setConstexpr(true); 3964 } 3965 } 3966 } 3967 3968 // Set the lexical context. If the declarator has a C++ scope specifier, the 3969 // lexical context will be different from the semantic context. 3970 NewVD->setLexicalDeclContext(CurContext); 3971 3972 if (D.getDeclSpec().isThreadSpecified()) { 3973 if (NewVD->hasLocalStorage()) 3974 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3975 else if (!Context.getTargetInfo().isTLSSupported()) 3976 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3977 else 3978 NewVD->setThreadSpecified(true); 3979 } 3980 3981 if (D.getDeclSpec().isModulePrivateSpecified()) { 3982 if (isExplicitSpecialization) 3983 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3984 << 2 3985 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3986 else if (NewVD->hasLocalStorage()) 3987 Diag(NewVD->getLocation(), diag::err_module_private_local) 3988 << 0 << NewVD->getDeclName() 3989 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3990 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3991 else 3992 NewVD->setModulePrivate(); 3993 } 3994 3995 // Handle attributes prior to checking for duplicates in MergeVarDecl 3996 ProcessDeclAttributes(S, NewVD, D); 3997 3998 // In auto-retain/release, infer strong retension for variables of 3999 // retainable type. 4000 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4001 NewVD->setInvalidDecl(); 4002 4003 // Handle GNU asm-label extension (encoded as an attribute). 4004 if (Expr *E = (Expr*)D.getAsmLabel()) { 4005 // The parser guarantees this is a string. 4006 StringLiteral *SE = cast<StringLiteral>(E); 4007 StringRef Label = SE->getString(); 4008 if (S->getFnParent() != 0) { 4009 switch (SC) { 4010 case SC_None: 4011 case SC_Auto: 4012 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4013 break; 4014 case SC_Register: 4015 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4016 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4017 break; 4018 case SC_Static: 4019 case SC_Extern: 4020 case SC_PrivateExtern: 4021 case SC_OpenCLWorkGroupLocal: 4022 break; 4023 } 4024 } 4025 4026 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4027 Context, Label)); 4028 } 4029 4030 // Diagnose shadowed variables before filtering for scope. 4031 if (!D.getCXXScopeSpec().isSet()) 4032 CheckShadow(S, NewVD, Previous); 4033 4034 // Don't consider existing declarations that are in a different 4035 // scope and are out-of-semantic-context declarations (if the new 4036 // declaration has linkage). 4037 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4038 isExplicitSpecialization); 4039 4040 if (!getLangOptions().CPlusPlus) { 4041 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4042 } else { 4043 // Merge the decl with the existing one if appropriate. 4044 if (!Previous.empty()) { 4045 if (Previous.isSingleResult() && 4046 isa<FieldDecl>(Previous.getFoundDecl()) && 4047 D.getCXXScopeSpec().isSet()) { 4048 // The user tried to define a non-static data member 4049 // out-of-line (C++ [dcl.meaning]p1). 4050 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4051 << D.getCXXScopeSpec().getRange(); 4052 Previous.clear(); 4053 NewVD->setInvalidDecl(); 4054 } 4055 } else if (D.getCXXScopeSpec().isSet()) { 4056 // No previous declaration in the qualifying scope. 4057 Diag(D.getIdentifierLoc(), diag::err_no_member) 4058 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4059 << D.getCXXScopeSpec().getRange(); 4060 NewVD->setInvalidDecl(); 4061 } 4062 4063 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4064 4065 // This is an explicit specialization of a static data member. Check it. 4066 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4067 CheckMemberSpecialization(NewVD, Previous)) 4068 NewVD->setInvalidDecl(); 4069 } 4070 4071 // attributes declared post-definition are currently ignored 4072 // FIXME: This should be handled in attribute merging, not 4073 // here. 4074 if (Previous.isSingleResult()) { 4075 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4076 if (Def && (Def = Def->getDefinition()) && 4077 Def != NewVD && D.hasAttributes()) { 4078 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4079 Diag(Def->getLocation(), diag::note_previous_definition); 4080 } 4081 } 4082 4083 // If this is a locally-scoped extern C variable, update the map of 4084 // such variables. 4085 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4086 !NewVD->isInvalidDecl()) 4087 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4088 4089 // If there's a #pragma GCC visibility in scope, and this isn't a class 4090 // member, set the visibility of this variable. 4091 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4092 AddPushedVisibilityAttribute(NewVD); 4093 4094 MarkUnusedFileScopedDecl(NewVD); 4095 4096 return NewVD; 4097} 4098 4099/// \brief Diagnose variable or built-in function shadowing. Implements 4100/// -Wshadow. 4101/// 4102/// This method is called whenever a VarDecl is added to a "useful" 4103/// scope. 4104/// 4105/// \param S the scope in which the shadowing name is being declared 4106/// \param R the lookup of the name 4107/// 4108void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4109 // Return if warning is ignored. 4110 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4111 DiagnosticsEngine::Ignored) 4112 return; 4113 4114 // Don't diagnose declarations at file scope. 4115 if (D->hasGlobalStorage()) 4116 return; 4117 4118 DeclContext *NewDC = D->getDeclContext(); 4119 4120 // Only diagnose if we're shadowing an unambiguous field or variable. 4121 if (R.getResultKind() != LookupResult::Found) 4122 return; 4123 4124 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4125 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4126 return; 4127 4128 // Fields are not shadowed by variables in C++ static methods. 4129 if (isa<FieldDecl>(ShadowedDecl)) 4130 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4131 if (MD->isStatic()) 4132 return; 4133 4134 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4135 if (shadowedVar->isExternC()) { 4136 // For shadowing external vars, make sure that we point to the global 4137 // declaration, not a locally scoped extern declaration. 4138 for (VarDecl::redecl_iterator 4139 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4140 I != E; ++I) 4141 if (I->isFileVarDecl()) { 4142 ShadowedDecl = *I; 4143 break; 4144 } 4145 } 4146 4147 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4148 4149 // Only warn about certain kinds of shadowing for class members. 4150 if (NewDC && NewDC->isRecord()) { 4151 // In particular, don't warn about shadowing non-class members. 4152 if (!OldDC->isRecord()) 4153 return; 4154 4155 // TODO: should we warn about static data members shadowing 4156 // static data members from base classes? 4157 4158 // TODO: don't diagnose for inaccessible shadowed members. 4159 // This is hard to do perfectly because we might friend the 4160 // shadowing context, but that's just a false negative. 4161 } 4162 4163 // Determine what kind of declaration we're shadowing. 4164 unsigned Kind; 4165 if (isa<RecordDecl>(OldDC)) { 4166 if (isa<FieldDecl>(ShadowedDecl)) 4167 Kind = 3; // field 4168 else 4169 Kind = 2; // static data member 4170 } else if (OldDC->isFileContext()) 4171 Kind = 1; // global 4172 else 4173 Kind = 0; // local 4174 4175 DeclarationName Name = R.getLookupName(); 4176 4177 // Emit warning and note. 4178 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4179 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4180} 4181 4182/// \brief Check -Wshadow without the advantage of a previous lookup. 4183void Sema::CheckShadow(Scope *S, VarDecl *D) { 4184 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4185 DiagnosticsEngine::Ignored) 4186 return; 4187 4188 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4189 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4190 LookupName(R, S); 4191 CheckShadow(S, D, R); 4192} 4193 4194/// \brief Perform semantic checking on a newly-created variable 4195/// declaration. 4196/// 4197/// This routine performs all of the type-checking required for a 4198/// variable declaration once it has been built. It is used both to 4199/// check variables after they have been parsed and their declarators 4200/// have been translated into a declaration, and to check variables 4201/// that have been instantiated from a template. 4202/// 4203/// Sets NewVD->isInvalidDecl() if an error was encountered. 4204/// 4205/// Returns true if the variable declaration is a redeclaration. 4206bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4207 LookupResult &Previous) { 4208 // If the decl is already known invalid, don't check it. 4209 if (NewVD->isInvalidDecl()) 4210 return false; 4211 4212 QualType T = NewVD->getType(); 4213 4214 if (T->isObjCObjectType()) { 4215 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4216 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4217 T = Context.getObjCObjectPointerType(T); 4218 NewVD->setType(T); 4219 } 4220 4221 // Emit an error if an address space was applied to decl with local storage. 4222 // This includes arrays of objects with address space qualifiers, but not 4223 // automatic variables that point to other address spaces. 4224 // ISO/IEC TR 18037 S5.1.2 4225 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4226 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4227 NewVD->setInvalidDecl(); 4228 return false; 4229 } 4230 4231 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4232 && !NewVD->hasAttr<BlocksAttr>()) { 4233 if (getLangOptions().getGC() != LangOptions::NonGC) 4234 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4235 else 4236 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4237 } 4238 4239 bool isVM = T->isVariablyModifiedType(); 4240 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4241 NewVD->hasAttr<BlocksAttr>()) 4242 getCurFunction()->setHasBranchProtectedScope(); 4243 4244 if ((isVM && NewVD->hasLinkage()) || 4245 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4246 bool SizeIsNegative; 4247 llvm::APSInt Oversized; 4248 QualType FixedTy = 4249 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4250 Oversized); 4251 4252 if (FixedTy.isNull() && T->isVariableArrayType()) { 4253 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4254 // FIXME: This won't give the correct result for 4255 // int a[10][n]; 4256 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4257 4258 if (NewVD->isFileVarDecl()) 4259 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4260 << SizeRange; 4261 else if (NewVD->getStorageClass() == SC_Static) 4262 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4263 << SizeRange; 4264 else 4265 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4266 << SizeRange; 4267 NewVD->setInvalidDecl(); 4268 return false; 4269 } 4270 4271 if (FixedTy.isNull()) { 4272 if (NewVD->isFileVarDecl()) 4273 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4274 else 4275 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4276 NewVD->setInvalidDecl(); 4277 return false; 4278 } 4279 4280 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4281 NewVD->setType(FixedTy); 4282 } 4283 4284 if (Previous.empty() && NewVD->isExternC()) { 4285 // Since we did not find anything by this name and we're declaring 4286 // an extern "C" variable, look for a non-visible extern "C" 4287 // declaration with the same name. 4288 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4289 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4290 if (Pos != LocallyScopedExternalDecls.end()) 4291 Previous.addDecl(Pos->second); 4292 } 4293 4294 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4295 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4296 << T; 4297 NewVD->setInvalidDecl(); 4298 return false; 4299 } 4300 4301 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4302 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4303 NewVD->setInvalidDecl(); 4304 return false; 4305 } 4306 4307 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4308 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4309 NewVD->setInvalidDecl(); 4310 return false; 4311 } 4312 4313 // Function pointers and references cannot have qualified function type, only 4314 // function pointer-to-members can do that. 4315 QualType Pointee; 4316 unsigned PtrOrRef = 0; 4317 if (const PointerType *Ptr = T->getAs<PointerType>()) 4318 Pointee = Ptr->getPointeeType(); 4319 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4320 Pointee = Ref->getPointeeType(); 4321 PtrOrRef = 1; 4322 } 4323 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4324 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4325 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4326 << PtrOrRef; 4327 NewVD->setInvalidDecl(); 4328 return false; 4329 } 4330 4331 if (!Previous.empty()) { 4332 MergeVarDecl(NewVD, Previous); 4333 return true; 4334 } 4335 return false; 4336} 4337 4338/// \brief Data used with FindOverriddenMethod 4339struct FindOverriddenMethodData { 4340 Sema *S; 4341 CXXMethodDecl *Method; 4342}; 4343 4344/// \brief Member lookup function that determines whether a given C++ 4345/// method overrides a method in a base class, to be used with 4346/// CXXRecordDecl::lookupInBases(). 4347static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4348 CXXBasePath &Path, 4349 void *UserData) { 4350 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4351 4352 FindOverriddenMethodData *Data 4353 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4354 4355 DeclarationName Name = Data->Method->getDeclName(); 4356 4357 // FIXME: Do we care about other names here too? 4358 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4359 // We really want to find the base class destructor here. 4360 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4361 CanQualType CT = Data->S->Context.getCanonicalType(T); 4362 4363 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4364 } 4365 4366 for (Path.Decls = BaseRecord->lookup(Name); 4367 Path.Decls.first != Path.Decls.second; 4368 ++Path.Decls.first) { 4369 NamedDecl *D = *Path.Decls.first; 4370 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4371 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4372 return true; 4373 } 4374 } 4375 4376 return false; 4377} 4378 4379/// AddOverriddenMethods - See if a method overrides any in the base classes, 4380/// and if so, check that it's a valid override and remember it. 4381bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4382 // Look for virtual methods in base classes that this method might override. 4383 CXXBasePaths Paths; 4384 FindOverriddenMethodData Data; 4385 Data.Method = MD; 4386 Data.S = this; 4387 bool AddedAny = false; 4388 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4389 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4390 E = Paths.found_decls_end(); I != E; ++I) { 4391 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4392 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4393 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4394 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4395 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4396 AddedAny = true; 4397 } 4398 } 4399 } 4400 } 4401 4402 return AddedAny; 4403} 4404 4405namespace { 4406 // Struct for holding all of the extra arguments needed by 4407 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4408 struct ActOnFDArgs { 4409 Scope *S; 4410 Declarator &D; 4411 MultiTemplateParamsArg TemplateParamLists; 4412 bool AddToScope; 4413 }; 4414} 4415 4416/// \brief Generate diagnostics for an invalid function redeclaration. 4417/// 4418/// This routine handles generating the diagnostic messages for an invalid 4419/// function redeclaration, including finding possible similar declarations 4420/// or performing typo correction if there are no previous declarations with 4421/// the same name. 4422/// 4423/// Returns a NamedDecl iff typo correction was performed and substituting in 4424/// the new declaration name does not cause new errors. 4425static NamedDecl* DiagnoseInvalidRedeclaration( 4426 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4427 ActOnFDArgs &ExtraArgs) { 4428 NamedDecl *Result = NULL; 4429 DeclarationName Name = NewFD->getDeclName(); 4430 DeclContext *NewDC = NewFD->getDeclContext(); 4431 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4432 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4433 llvm::SmallVector<unsigned, 1> MismatchedParams; 4434 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4435 TypoCorrection Correction; 4436 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4437 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4438 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4439 : diag::err_member_def_does_not_match; 4440 4441 NewFD->setInvalidDecl(); 4442 SemaRef.LookupQualifiedName(Prev, NewDC); 4443 assert(!Prev.isAmbiguous() && 4444 "Cannot have an ambiguity in previous-declaration lookup"); 4445 if (!Prev.empty()) { 4446 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4447 Func != FuncEnd; ++Func) { 4448 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4449 if (FD && 4450 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4451 // Add 1 to the index so that 0 can mean the mismatch didn't 4452 // involve a parameter 4453 unsigned ParamNum = 4454 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4455 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4456 } 4457 } 4458 // If the qualified name lookup yielded nothing, try typo correction 4459 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4460 Prev.getLookupKind(), 0, 0, NewDC)) && 4461 Correction.getCorrection() != Name) { 4462 // Trap errors. 4463 Sema::SFINAETrap Trap(SemaRef); 4464 4465 // Set up everything for the call to ActOnFunctionDeclarator 4466 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4467 ExtraArgs.D.getIdentifierLoc()); 4468 Previous.clear(); 4469 Previous.setLookupName(Correction.getCorrection()); 4470 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4471 CDeclEnd = Correction.end(); 4472 CDecl != CDeclEnd; ++CDecl) { 4473 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4474 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4475 MismatchedParams)) { 4476 Previous.addDecl(FD); 4477 } 4478 } 4479 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4480 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4481 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4482 // eliminate the need for the parameter pack ExtraArgs. 4483 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4484 NewFD->getDeclContext(), 4485 NewFD->getTypeSourceInfo(), 4486 Previous, 4487 ExtraArgs.TemplateParamLists, 4488 ExtraArgs.AddToScope); 4489 if (Trap.hasErrorOccurred()) { 4490 // Pretend the typo correction never occurred 4491 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4492 ExtraArgs.D.getIdentifierLoc()); 4493 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4494 Previous.clear(); 4495 Previous.setLookupName(Name); 4496 Result = NULL; 4497 } else { 4498 for (LookupResult::iterator Func = Previous.begin(), 4499 FuncEnd = Previous.end(); 4500 Func != FuncEnd; ++Func) { 4501 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4502 NearMatches.push_back(std::make_pair(FD, 0)); 4503 } 4504 } 4505 if (NearMatches.empty()) { 4506 // Ignore the correction if it didn't yield any close FunctionDecl matches 4507 Correction = TypoCorrection(); 4508 } else { 4509 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4510 : diag::err_member_def_does_not_match_suggest; 4511 } 4512 } 4513 4514 if (Correction) 4515 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4516 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4517 << FixItHint::CreateReplacement( 4518 NewFD->getLocation(), 4519 Correction.getAsString(SemaRef.getLangOptions())); 4520 else 4521 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4522 << Name << NewDC << NewFD->getLocation(); 4523 4524 bool NewFDisConst = false; 4525 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4526 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4527 4528 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4529 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4530 NearMatch != NearMatchEnd; ++NearMatch) { 4531 FunctionDecl *FD = NearMatch->first; 4532 bool FDisConst = false; 4533 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4534 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4535 4536 if (unsigned Idx = NearMatch->second) { 4537 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4538 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4539 diag::note_member_def_close_param_match) 4540 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4541 } else if (Correction) { 4542 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4543 << Correction.getQuoted(SemaRef.getLangOptions()); 4544 } else if (FDisConst != NewFDisConst) { 4545 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4546 << NewFDisConst << FD->getSourceRange().getEnd(); 4547 } else 4548 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4549 } 4550 return Result; 4551} 4552 4553static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4554 Declarator &D) { 4555 switch (D.getDeclSpec().getStorageClassSpec()) { 4556 default: llvm_unreachable("Unknown storage class!"); 4557 case DeclSpec::SCS_auto: 4558 case DeclSpec::SCS_register: 4559 case DeclSpec::SCS_mutable: 4560 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4561 diag::err_typecheck_sclass_func); 4562 D.setInvalidType(); 4563 break; 4564 case DeclSpec::SCS_unspecified: break; 4565 case DeclSpec::SCS_extern: return SC_Extern; 4566 case DeclSpec::SCS_static: { 4567 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4568 // C99 6.7.1p5: 4569 // The declaration of an identifier for a function that has 4570 // block scope shall have no explicit storage-class specifier 4571 // other than extern 4572 // See also (C++ [dcl.stc]p4). 4573 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4574 diag::err_static_block_func); 4575 break; 4576 } else 4577 return SC_Static; 4578 } 4579 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4580 } 4581 4582 // No explicit storage class has already been returned 4583 return SC_None; 4584} 4585 4586static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4587 DeclContext *DC, QualType &R, 4588 TypeSourceInfo *TInfo, 4589 FunctionDecl::StorageClass SC, 4590 bool &IsVirtualOkay) { 4591 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4592 DeclarationName Name = NameInfo.getName(); 4593 4594 FunctionDecl *NewFD = 0; 4595 bool isInline = D.getDeclSpec().isInlineSpecified(); 4596 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4597 FunctionDecl::StorageClass SCAsWritten 4598 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4599 4600 if (!SemaRef.getLangOptions().CPlusPlus) { 4601 // Determine whether the function was written with a 4602 // prototype. This true when: 4603 // - there is a prototype in the declarator, or 4604 // - the type R of the function is some kind of typedef or other reference 4605 // to a type name (which eventually refers to a function type). 4606 bool HasPrototype = 4607 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4608 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4609 4610 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4611 D.getSourceRange().getBegin(), NameInfo, R, 4612 TInfo, SC, SCAsWritten, isInline, 4613 HasPrototype); 4614 if (D.isInvalidType()) 4615 NewFD->setInvalidDecl(); 4616 4617 // Set the lexical context. 4618 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4619 4620 return NewFD; 4621 } 4622 4623 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4624 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4625 4626 // Check that the return type is not an abstract class type. 4627 // For record types, this is done by the AbstractClassUsageDiagnoser once 4628 // the class has been completely parsed. 4629 if (!DC->isRecord() && 4630 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4631 R->getAs<FunctionType>()->getResultType(), 4632 diag::err_abstract_type_in_decl, 4633 SemaRef.AbstractReturnType)) 4634 D.setInvalidType(); 4635 4636 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4637 // This is a C++ constructor declaration. 4638 assert(DC->isRecord() && 4639 "Constructors can only be declared in a member context"); 4640 4641 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4642 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4643 D.getSourceRange().getBegin(), NameInfo, 4644 R, TInfo, isExplicit, isInline, 4645 /*isImplicitlyDeclared=*/false, 4646 isConstexpr); 4647 4648 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4649 // This is a C++ destructor declaration. 4650 if (DC->isRecord()) { 4651 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4652 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4653 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4654 SemaRef.Context, Record, 4655 D.getSourceRange().getBegin(), 4656 NameInfo, R, TInfo, isInline, 4657 /*isImplicitlyDeclared=*/false); 4658 4659 // If the class is complete, then we now create the implicit exception 4660 // specification. If the class is incomplete or dependent, we can't do 4661 // it yet. 4662 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4663 Record->getDefinition() && !Record->isBeingDefined() && 4664 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4665 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4666 } 4667 4668 IsVirtualOkay = true; 4669 return NewDD; 4670 4671 } else { 4672 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4673 D.setInvalidType(); 4674 4675 // Create a FunctionDecl to satisfy the function definition parsing 4676 // code path. 4677 return FunctionDecl::Create(SemaRef.Context, DC, 4678 D.getSourceRange().getBegin(), 4679 D.getIdentifierLoc(), Name, R, TInfo, 4680 SC, SCAsWritten, isInline, 4681 /*hasPrototype=*/true, isConstexpr); 4682 } 4683 4684 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4685 if (!DC->isRecord()) { 4686 SemaRef.Diag(D.getIdentifierLoc(), 4687 diag::err_conv_function_not_member); 4688 return 0; 4689 } 4690 4691 SemaRef.CheckConversionDeclarator(D, R, SC); 4692 IsVirtualOkay = true; 4693 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4694 D.getSourceRange().getBegin(), NameInfo, 4695 R, TInfo, isInline, isExplicit, 4696 isConstexpr, SourceLocation()); 4697 4698 } else if (DC->isRecord()) { 4699 // If the name of the function is the same as the name of the record, 4700 // then this must be an invalid constructor that has a return type. 4701 // (The parser checks for a return type and makes the declarator a 4702 // constructor if it has no return type). 4703 if (Name.getAsIdentifierInfo() && 4704 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4705 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4706 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4707 << SourceRange(D.getIdentifierLoc()); 4708 return 0; 4709 } 4710 4711 bool isStatic = SC == SC_Static; 4712 4713 // [class.free]p1: 4714 // Any allocation function for a class T is a static member 4715 // (even if not explicitly declared static). 4716 if (Name.getCXXOverloadedOperator() == OO_New || 4717 Name.getCXXOverloadedOperator() == OO_Array_New) 4718 isStatic = true; 4719 4720 // [class.free]p6 Any deallocation function for a class X is a static member 4721 // (even if not explicitly declared static). 4722 if (Name.getCXXOverloadedOperator() == OO_Delete || 4723 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4724 isStatic = true; 4725 4726 IsVirtualOkay = !isStatic; 4727 4728 // This is a C++ method declaration. 4729 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4730 D.getSourceRange().getBegin(), NameInfo, R, 4731 TInfo, isStatic, SCAsWritten, isInline, 4732 isConstexpr, SourceLocation()); 4733 4734 } else { 4735 // Determine whether the function was written with a 4736 // prototype. This true when: 4737 // - we're in C++ (where every function has a prototype), 4738 return FunctionDecl::Create(SemaRef.Context, DC, 4739 D.getSourceRange().getBegin(), 4740 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4741 true/*HasPrototype*/, isConstexpr); 4742 } 4743} 4744 4745NamedDecl* 4746Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4747 TypeSourceInfo *TInfo, LookupResult &Previous, 4748 MultiTemplateParamsArg TemplateParamLists, 4749 bool &AddToScope) { 4750 QualType R = TInfo->getType(); 4751 4752 assert(R.getTypePtr()->isFunctionType()); 4753 4754 // TODO: consider using NameInfo for diagnostic. 4755 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4756 DeclarationName Name = NameInfo.getName(); 4757 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4758 4759 if (D.getDeclSpec().isThreadSpecified()) 4760 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4761 4762 // Do not allow returning a objc interface by-value. 4763 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4764 Diag(D.getIdentifierLoc(), 4765 diag::err_object_cannot_be_passed_returned_by_value) << 0 4766 << R->getAs<FunctionType>()->getResultType() 4767 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4768 4769 QualType T = R->getAs<FunctionType>()->getResultType(); 4770 T = Context.getObjCObjectPointerType(T); 4771 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4772 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4773 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4774 FPT->getNumArgs(), EPI); 4775 } 4776 else if (isa<FunctionNoProtoType>(R)) 4777 R = Context.getFunctionNoProtoType(T); 4778 } 4779 4780 bool isFriend = false; 4781 FunctionTemplateDecl *FunctionTemplate = 0; 4782 bool isExplicitSpecialization = false; 4783 bool isFunctionTemplateSpecialization = false; 4784 bool isDependentClassScopeExplicitSpecialization = false; 4785 bool isVirtualOkay = false; 4786 4787 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4788 isVirtualOkay); 4789 if (!NewFD) return 0; 4790 4791 if (getLangOptions().CPlusPlus) { 4792 bool isInline = D.getDeclSpec().isInlineSpecified(); 4793 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4794 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4795 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4796 isFriend = D.getDeclSpec().isFriendSpecified(); 4797 if (isFriend && !isInline && D.isFunctionDefinition()) { 4798 // C++ [class.friend]p5 4799 // A function can be defined in a friend declaration of a 4800 // class . . . . Such a function is implicitly inline. 4801 NewFD->setImplicitlyInline(); 4802 } 4803 4804 SetNestedNameSpecifier(NewFD, D); 4805 isExplicitSpecialization = false; 4806 isFunctionTemplateSpecialization = false; 4807 if (D.isInvalidType()) 4808 NewFD->setInvalidDecl(); 4809 4810 // Set the lexical context. If the declarator has a C++ 4811 // scope specifier, or is the object of a friend declaration, the 4812 // lexical context will be different from the semantic context. 4813 NewFD->setLexicalDeclContext(CurContext); 4814 4815 // Match up the template parameter lists with the scope specifier, then 4816 // determine whether we have a template or a template specialization. 4817 bool Invalid = false; 4818 if (TemplateParameterList *TemplateParams 4819 = MatchTemplateParametersToScopeSpecifier( 4820 D.getDeclSpec().getSourceRange().getBegin(), 4821 D.getIdentifierLoc(), 4822 D.getCXXScopeSpec(), 4823 TemplateParamLists.get(), 4824 TemplateParamLists.size(), 4825 isFriend, 4826 isExplicitSpecialization, 4827 Invalid)) { 4828 if (TemplateParams->size() > 0) { 4829 // This is a function template 4830 4831 // Check that we can declare a template here. 4832 if (CheckTemplateDeclScope(S, TemplateParams)) 4833 return 0; 4834 4835 // A destructor cannot be a template. 4836 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4837 Diag(NewFD->getLocation(), diag::err_destructor_template); 4838 return 0; 4839 } 4840 4841 // If we're adding a template to a dependent context, we may need to 4842 // rebuilding some of the types used within the template parameter list, 4843 // now that we know what the current instantiation is. 4844 if (DC->isDependentContext()) { 4845 ContextRAII SavedContext(*this, DC); 4846 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4847 Invalid = true; 4848 } 4849 4850 4851 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4852 NewFD->getLocation(), 4853 Name, TemplateParams, 4854 NewFD); 4855 FunctionTemplate->setLexicalDeclContext(CurContext); 4856 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4857 4858 // For source fidelity, store the other template param lists. 4859 if (TemplateParamLists.size() > 1) { 4860 NewFD->setTemplateParameterListsInfo(Context, 4861 TemplateParamLists.size() - 1, 4862 TemplateParamLists.release()); 4863 } 4864 } else { 4865 // This is a function template specialization. 4866 isFunctionTemplateSpecialization = true; 4867 // For source fidelity, store all the template param lists. 4868 NewFD->setTemplateParameterListsInfo(Context, 4869 TemplateParamLists.size(), 4870 TemplateParamLists.release()); 4871 4872 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4873 if (isFriend) { 4874 // We want to remove the "template<>", found here. 4875 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4876 4877 // If we remove the template<> and the name is not a 4878 // template-id, we're actually silently creating a problem: 4879 // the friend declaration will refer to an untemplated decl, 4880 // and clearly the user wants a template specialization. So 4881 // we need to insert '<>' after the name. 4882 SourceLocation InsertLoc; 4883 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4884 InsertLoc = D.getName().getSourceRange().getEnd(); 4885 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4886 } 4887 4888 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4889 << Name << RemoveRange 4890 << FixItHint::CreateRemoval(RemoveRange) 4891 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4892 } 4893 } 4894 } 4895 else { 4896 // All template param lists were matched against the scope specifier: 4897 // this is NOT (an explicit specialization of) a template. 4898 if (TemplateParamLists.size() > 0) 4899 // For source fidelity, store all the template param lists. 4900 NewFD->setTemplateParameterListsInfo(Context, 4901 TemplateParamLists.size(), 4902 TemplateParamLists.release()); 4903 } 4904 4905 if (Invalid) { 4906 NewFD->setInvalidDecl(); 4907 if (FunctionTemplate) 4908 FunctionTemplate->setInvalidDecl(); 4909 } 4910 4911 // C++ [dcl.fct.spec]p5: 4912 // The virtual specifier shall only be used in declarations of 4913 // nonstatic class member functions that appear within a 4914 // member-specification of a class declaration; see 10.3. 4915 // 4916 if (isVirtual && !NewFD->isInvalidDecl()) { 4917 if (!isVirtualOkay) { 4918 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4919 diag::err_virtual_non_function); 4920 } else if (!CurContext->isRecord()) { 4921 // 'virtual' was specified outside of the class. 4922 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4923 diag::err_virtual_out_of_class) 4924 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4925 } else if (NewFD->getDescribedFunctionTemplate()) { 4926 // C++ [temp.mem]p3: 4927 // A member function template shall not be virtual. 4928 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4929 diag::err_virtual_member_function_template) 4930 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4931 } else { 4932 // Okay: Add virtual to the method. 4933 NewFD->setVirtualAsWritten(true); 4934 } 4935 } 4936 4937 // C++ [dcl.fct.spec]p3: 4938 // The inline specifier shall not appear on a block scope function 4939 // declaration. 4940 if (isInline && !NewFD->isInvalidDecl()) { 4941 if (CurContext->isFunctionOrMethod()) { 4942 // 'inline' is not allowed on block scope function declaration. 4943 Diag(D.getDeclSpec().getInlineSpecLoc(), 4944 diag::err_inline_declaration_block_scope) << Name 4945 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4946 } 4947 } 4948 4949 // C++ [dcl.fct.spec]p6: 4950 // The explicit specifier shall be used only in the declaration of a 4951 // constructor or conversion function within its class definition; 4952 // see 12.3.1 and 12.3.2. 4953 if (isExplicit && !NewFD->isInvalidDecl()) { 4954 if (!CurContext->isRecord()) { 4955 // 'explicit' was specified outside of the class. 4956 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4957 diag::err_explicit_out_of_class) 4958 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4959 } else if (!isa<CXXConstructorDecl>(NewFD) && 4960 !isa<CXXConversionDecl>(NewFD)) { 4961 // 'explicit' was specified on a function that wasn't a constructor 4962 // or conversion function. 4963 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4964 diag::err_explicit_non_ctor_or_conv_function) 4965 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4966 } 4967 } 4968 4969 if (isConstexpr) { 4970 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4971 // are implicitly inline. 4972 NewFD->setImplicitlyInline(); 4973 4974 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4975 // be either constructors or to return a literal type. Therefore, 4976 // destructors cannot be declared constexpr. 4977 if (isa<CXXDestructorDecl>(NewFD)) 4978 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4979 } 4980 4981 // If __module_private__ was specified, mark the function accordingly. 4982 if (D.getDeclSpec().isModulePrivateSpecified()) { 4983 if (isFunctionTemplateSpecialization) { 4984 SourceLocation ModulePrivateLoc 4985 = D.getDeclSpec().getModulePrivateSpecLoc(); 4986 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4987 << 0 4988 << FixItHint::CreateRemoval(ModulePrivateLoc); 4989 } else { 4990 NewFD->setModulePrivate(); 4991 if (FunctionTemplate) 4992 FunctionTemplate->setModulePrivate(); 4993 } 4994 } 4995 4996 if (isFriend) { 4997 // For now, claim that the objects have no previous declaration. 4998 if (FunctionTemplate) { 4999 FunctionTemplate->setObjectOfFriendDecl(false); 5000 FunctionTemplate->setAccess(AS_public); 5001 } 5002 NewFD->setObjectOfFriendDecl(false); 5003 NewFD->setAccess(AS_public); 5004 } 5005 5006 // If a function is defined as defaulted or deleted, mark it as such now. 5007 switch (D.getFunctionDefinitionKind()) { 5008 case FDK_Declaration: 5009 case FDK_Definition: 5010 break; 5011 5012 case FDK_Defaulted: 5013 NewFD->setDefaulted(); 5014 break; 5015 5016 case FDK_Deleted: 5017 NewFD->setDeletedAsWritten(); 5018 break; 5019 } 5020 5021 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5022 D.isFunctionDefinition()) { 5023 // C++ [class.mfct]p2: 5024 // A member function may be defined (8.4) in its class definition, in 5025 // which case it is an inline member function (7.1.2) 5026 NewFD->setImplicitlyInline(); 5027 } 5028 5029 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5030 !CurContext->isRecord()) { 5031 // C++ [class.static]p1: 5032 // A data or function member of a class may be declared static 5033 // in a class definition, in which case it is a static member of 5034 // the class. 5035 5036 // Complain about the 'static' specifier if it's on an out-of-line 5037 // member function definition. 5038 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5039 diag::err_static_out_of_line) 5040 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5041 } 5042 } 5043 5044 // Filter out previous declarations that don't match the scope. 5045 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5046 isExplicitSpecialization || 5047 isFunctionTemplateSpecialization); 5048 5049 // Handle GNU asm-label extension (encoded as an attribute). 5050 if (Expr *E = (Expr*) D.getAsmLabel()) { 5051 // The parser guarantees this is a string. 5052 StringLiteral *SE = cast<StringLiteral>(E); 5053 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5054 SE->getString())); 5055 } 5056 5057 // Copy the parameter declarations from the declarator D to the function 5058 // declaration NewFD, if they are available. First scavenge them into Params. 5059 SmallVector<ParmVarDecl*, 16> Params; 5060 if (D.isFunctionDeclarator()) { 5061 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5062 5063 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5064 // function that takes no arguments, not a function that takes a 5065 // single void argument. 5066 // We let through "const void" here because Sema::GetTypeForDeclarator 5067 // already checks for that case. 5068 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5069 FTI.ArgInfo[0].Param && 5070 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5071 // Empty arg list, don't push any params. 5072 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5073 5074 // In C++, the empty parameter-type-list must be spelled "void"; a 5075 // typedef of void is not permitted. 5076 if (getLangOptions().CPlusPlus && 5077 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5078 bool IsTypeAlias = false; 5079 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5080 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5081 else if (const TemplateSpecializationType *TST = 5082 Param->getType()->getAs<TemplateSpecializationType>()) 5083 IsTypeAlias = TST->isTypeAlias(); 5084 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5085 << IsTypeAlias; 5086 } 5087 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5088 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5089 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5090 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5091 Param->setDeclContext(NewFD); 5092 Params.push_back(Param); 5093 5094 if (Param->isInvalidDecl()) 5095 NewFD->setInvalidDecl(); 5096 } 5097 } 5098 5099 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5100 // When we're declaring a function with a typedef, typeof, etc as in the 5101 // following example, we'll need to synthesize (unnamed) 5102 // parameters for use in the declaration. 5103 // 5104 // @code 5105 // typedef void fn(int); 5106 // fn f; 5107 // @endcode 5108 5109 // Synthesize a parameter for each argument type. 5110 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5111 AE = FT->arg_type_end(); AI != AE; ++AI) { 5112 ParmVarDecl *Param = 5113 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5114 Param->setScopeInfo(0, Params.size()); 5115 Params.push_back(Param); 5116 } 5117 } else { 5118 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5119 "Should not need args for typedef of non-prototype fn"); 5120 } 5121 5122 // Finally, we know we have the right number of parameters, install them. 5123 NewFD->setParams(Params); 5124 5125 // Process the non-inheritable attributes on this declaration. 5126 ProcessDeclAttributes(S, NewFD, D, 5127 /*NonInheritable=*/true, /*Inheritable=*/false); 5128 5129 if (!getLangOptions().CPlusPlus) { 5130 // Perform semantic checking on the function declaration. 5131 bool isExplicitSpecialization=false; 5132 if (!NewFD->isInvalidDecl()) { 5133 if (NewFD->getResultType()->isVariablyModifiedType()) { 5134 // Functions returning a variably modified type violate C99 6.7.5.2p2 5135 // because all functions have linkage. 5136 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5137 NewFD->setInvalidDecl(); 5138 } else { 5139 if (NewFD->isMain()) 5140 CheckMain(NewFD, D.getDeclSpec()); 5141 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5142 isExplicitSpecialization)); 5143 } 5144 } 5145 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5146 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5147 "previous declaration set still overloaded"); 5148 } else { 5149 // If the declarator is a template-id, translate the parser's template 5150 // argument list into our AST format. 5151 bool HasExplicitTemplateArgs = false; 5152 TemplateArgumentListInfo TemplateArgs; 5153 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5154 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5155 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5156 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5157 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5158 TemplateId->getTemplateArgs(), 5159 TemplateId->NumArgs); 5160 translateTemplateArguments(TemplateArgsPtr, 5161 TemplateArgs); 5162 TemplateArgsPtr.release(); 5163 5164 HasExplicitTemplateArgs = true; 5165 5166 if (NewFD->isInvalidDecl()) { 5167 HasExplicitTemplateArgs = false; 5168 } else if (FunctionTemplate) { 5169 // Function template with explicit template arguments. 5170 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5171 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5172 5173 HasExplicitTemplateArgs = false; 5174 } else if (!isFunctionTemplateSpecialization && 5175 !D.getDeclSpec().isFriendSpecified()) { 5176 // We have encountered something that the user meant to be a 5177 // specialization (because it has explicitly-specified template 5178 // arguments) but that was not introduced with a "template<>" (or had 5179 // too few of them). 5180 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5181 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5182 << FixItHint::CreateInsertion( 5183 D.getDeclSpec().getSourceRange().getBegin(), 5184 "template<> "); 5185 isFunctionTemplateSpecialization = true; 5186 } else { 5187 // "friend void foo<>(int);" is an implicit specialization decl. 5188 isFunctionTemplateSpecialization = true; 5189 } 5190 } else if (isFriend && isFunctionTemplateSpecialization) { 5191 // This combination is only possible in a recovery case; the user 5192 // wrote something like: 5193 // template <> friend void foo(int); 5194 // which we're recovering from as if the user had written: 5195 // friend void foo<>(int); 5196 // Go ahead and fake up a template id. 5197 HasExplicitTemplateArgs = true; 5198 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5199 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5200 } 5201 5202 // If it's a friend (and only if it's a friend), it's possible 5203 // that either the specialized function type or the specialized 5204 // template is dependent, and therefore matching will fail. In 5205 // this case, don't check the specialization yet. 5206 bool InstantiationDependent = false; 5207 if (isFunctionTemplateSpecialization && isFriend && 5208 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5209 TemplateSpecializationType::anyDependentTemplateArguments( 5210 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5211 InstantiationDependent))) { 5212 assert(HasExplicitTemplateArgs && 5213 "friend function specialization without template args"); 5214 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5215 Previous)) 5216 NewFD->setInvalidDecl(); 5217 } else if (isFunctionTemplateSpecialization) { 5218 if (CurContext->isDependentContext() && CurContext->isRecord() 5219 && !isFriend) { 5220 isDependentClassScopeExplicitSpecialization = true; 5221 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5222 diag::ext_function_specialization_in_class : 5223 diag::err_function_specialization_in_class) 5224 << NewFD->getDeclName(); 5225 } else if (CheckFunctionTemplateSpecialization(NewFD, 5226 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5227 Previous)) 5228 NewFD->setInvalidDecl(); 5229 5230 // C++ [dcl.stc]p1: 5231 // A storage-class-specifier shall not be specified in an explicit 5232 // specialization (14.7.3) 5233 if (SC != SC_None) { 5234 if (SC != NewFD->getStorageClass()) 5235 Diag(NewFD->getLocation(), 5236 diag::err_explicit_specialization_inconsistent_storage_class) 5237 << SC 5238 << FixItHint::CreateRemoval( 5239 D.getDeclSpec().getStorageClassSpecLoc()); 5240 5241 else 5242 Diag(NewFD->getLocation(), 5243 diag::ext_explicit_specialization_storage_class) 5244 << FixItHint::CreateRemoval( 5245 D.getDeclSpec().getStorageClassSpecLoc()); 5246 } 5247 5248 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5249 if (CheckMemberSpecialization(NewFD, Previous)) 5250 NewFD->setInvalidDecl(); 5251 } 5252 5253 // Perform semantic checking on the function declaration. 5254 if (!isDependentClassScopeExplicitSpecialization) { 5255 if (NewFD->isInvalidDecl()) { 5256 // If this is a class member, mark the class invalid immediately. 5257 // This avoids some consistency errors later. 5258 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5259 methodDecl->getParent()->setInvalidDecl(); 5260 } else { 5261 if (NewFD->isMain()) 5262 CheckMain(NewFD, D.getDeclSpec()); 5263 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5264 isExplicitSpecialization)); 5265 } 5266 } 5267 5268 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5269 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5270 "previous declaration set still overloaded"); 5271 5272 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5273 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5274 NewFD->setInvalidDecl(); 5275 5276 NamedDecl *PrincipalDecl = (FunctionTemplate 5277 ? cast<NamedDecl>(FunctionTemplate) 5278 : NewFD); 5279 5280 if (isFriend && D.isRedeclaration()) { 5281 AccessSpecifier Access = AS_public; 5282 if (!NewFD->isInvalidDecl()) 5283 Access = NewFD->getPreviousDeclaration()->getAccess(); 5284 5285 NewFD->setAccess(Access); 5286 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5287 5288 PrincipalDecl->setObjectOfFriendDecl(true); 5289 } 5290 5291 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5292 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5293 PrincipalDecl->setNonMemberOperator(); 5294 5295 // If we have a function template, check the template parameter 5296 // list. This will check and merge default template arguments. 5297 if (FunctionTemplate) { 5298 FunctionTemplateDecl *PrevTemplate = 5299 FunctionTemplate->getPreviousDeclaration(); 5300 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5301 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5302 D.getDeclSpec().isFriendSpecified() 5303 ? (D.isFunctionDefinition() 5304 ? TPC_FriendFunctionTemplateDefinition 5305 : TPC_FriendFunctionTemplate) 5306 : (D.getCXXScopeSpec().isSet() && 5307 DC && DC->isRecord() && 5308 DC->isDependentContext()) 5309 ? TPC_ClassTemplateMember 5310 : TPC_FunctionTemplate); 5311 } 5312 5313 if (NewFD->isInvalidDecl()) { 5314 // Ignore all the rest of this. 5315 } else if (!D.isRedeclaration()) { 5316 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5317 AddToScope }; 5318 // Fake up an access specifier if it's supposed to be a class member. 5319 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5320 NewFD->setAccess(AS_public); 5321 5322 // Qualified decls generally require a previous declaration. 5323 if (D.getCXXScopeSpec().isSet()) { 5324 // ...with the major exception of templated-scope or 5325 // dependent-scope friend declarations. 5326 5327 // TODO: we currently also suppress this check in dependent 5328 // contexts because (1) the parameter depth will be off when 5329 // matching friend templates and (2) we might actually be 5330 // selecting a friend based on a dependent factor. But there 5331 // are situations where these conditions don't apply and we 5332 // can actually do this check immediately. 5333 if (isFriend && 5334 (TemplateParamLists.size() || 5335 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5336 CurContext->isDependentContext())) { 5337 // ignore these 5338 } else { 5339 // The user tried to provide an out-of-line definition for a 5340 // function that is a member of a class or namespace, but there 5341 // was no such member function declared (C++ [class.mfct]p2, 5342 // C++ [namespace.memdef]p2). For example: 5343 // 5344 // class X { 5345 // void f() const; 5346 // }; 5347 // 5348 // void X::f() { } // ill-formed 5349 // 5350 // Complain about this problem, and attempt to suggest close 5351 // matches (e.g., those that differ only in cv-qualifiers and 5352 // whether the parameter types are references). 5353 5354 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5355 NewFD, 5356 ExtraArgs)) { 5357 AddToScope = ExtraArgs.AddToScope; 5358 return Result; 5359 } 5360 } 5361 5362 // Unqualified local friend declarations are required to resolve 5363 // to something. 5364 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5365 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5366 NewFD, 5367 ExtraArgs)) { 5368 AddToScope = ExtraArgs.AddToScope; 5369 return Result; 5370 } 5371 } 5372 5373 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5374 !isFriend && !isFunctionTemplateSpecialization && 5375 !isExplicitSpecialization) { 5376 // An out-of-line member function declaration must also be a 5377 // definition (C++ [dcl.meaning]p1). 5378 // Note that this is not the case for explicit specializations of 5379 // function templates or member functions of class templates, per 5380 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5381 // extension for compatibility with old SWIG code which likes to 5382 // generate them. 5383 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5384 << D.getCXXScopeSpec().getRange(); 5385 } 5386 } 5387 5388 5389 // Handle attributes. We need to have merged decls when handling attributes 5390 // (for example to check for conflicts, etc). 5391 // FIXME: This needs to happen before we merge declarations. Then, 5392 // let attribute merging cope with attribute conflicts. 5393 ProcessDeclAttributes(S, NewFD, D, 5394 /*NonInheritable=*/false, /*Inheritable=*/true); 5395 5396 // attributes declared post-definition are currently ignored 5397 // FIXME: This should happen during attribute merging 5398 if (D.isRedeclaration() && Previous.isSingleResult()) { 5399 const FunctionDecl *Def; 5400 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5401 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5402 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5403 Diag(Def->getLocation(), diag::note_previous_definition); 5404 } 5405 } 5406 5407 AddKnownFunctionAttributes(NewFD); 5408 5409 if (NewFD->hasAttr<OverloadableAttr>() && 5410 !NewFD->getType()->getAs<FunctionProtoType>()) { 5411 Diag(NewFD->getLocation(), 5412 diag::err_attribute_overloadable_no_prototype) 5413 << NewFD; 5414 5415 // Turn this into a variadic function with no parameters. 5416 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5417 FunctionProtoType::ExtProtoInfo EPI; 5418 EPI.Variadic = true; 5419 EPI.ExtInfo = FT->getExtInfo(); 5420 5421 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5422 NewFD->setType(R); 5423 } 5424 5425 // If there's a #pragma GCC visibility in scope, and this isn't a class 5426 // member, set the visibility of this function. 5427 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5428 AddPushedVisibilityAttribute(NewFD); 5429 5430 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5431 // marking the function. 5432 AddCFAuditedAttribute(NewFD); 5433 5434 // If this is a locally-scoped extern C function, update the 5435 // map of such names. 5436 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5437 && !NewFD->isInvalidDecl()) 5438 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5439 5440 // Set this FunctionDecl's range up to the right paren. 5441 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5442 5443 if (getLangOptions().CPlusPlus) { 5444 if (FunctionTemplate) { 5445 if (NewFD->isInvalidDecl()) 5446 FunctionTemplate->setInvalidDecl(); 5447 return FunctionTemplate; 5448 } 5449 } 5450 5451 MarkUnusedFileScopedDecl(NewFD); 5452 5453 if (getLangOptions().CUDA) 5454 if (IdentifierInfo *II = NewFD->getIdentifier()) 5455 if (!NewFD->isInvalidDecl() && 5456 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5457 if (II->isStr("cudaConfigureCall")) { 5458 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5459 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5460 5461 Context.setcudaConfigureCallDecl(NewFD); 5462 } 5463 } 5464 5465 // Here we have an function template explicit specialization at class scope. 5466 // The actually specialization will be postponed to template instatiation 5467 // time via the ClassScopeFunctionSpecializationDecl node. 5468 if (isDependentClassScopeExplicitSpecialization) { 5469 ClassScopeFunctionSpecializationDecl *NewSpec = 5470 ClassScopeFunctionSpecializationDecl::Create( 5471 Context, CurContext, SourceLocation(), 5472 cast<CXXMethodDecl>(NewFD)); 5473 CurContext->addDecl(NewSpec); 5474 AddToScope = false; 5475 } 5476 5477 return NewFD; 5478} 5479 5480/// \brief Perform semantic checking of a new function declaration. 5481/// 5482/// Performs semantic analysis of the new function declaration 5483/// NewFD. This routine performs all semantic checking that does not 5484/// require the actual declarator involved in the declaration, and is 5485/// used both for the declaration of functions as they are parsed 5486/// (called via ActOnDeclarator) and for the declaration of functions 5487/// that have been instantiated via C++ template instantiation (called 5488/// via InstantiateDecl). 5489/// 5490/// \param IsExplicitSpecialiation whether this new function declaration is 5491/// an explicit specialization of the previous declaration. 5492/// 5493/// This sets NewFD->isInvalidDecl() to true if there was an error. 5494/// 5495/// Returns true if the function declaration is a redeclaration. 5496bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5497 LookupResult &Previous, 5498 bool IsExplicitSpecialization) { 5499 assert(!NewFD->getResultType()->isVariablyModifiedType() 5500 && "Variably modified return types are not handled here"); 5501 5502 // Check for a previous declaration of this name. 5503 if (Previous.empty() && NewFD->isExternC()) { 5504 // Since we did not find anything by this name and we're declaring 5505 // an extern "C" function, look for a non-visible extern "C" 5506 // declaration with the same name. 5507 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5508 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5509 if (Pos != LocallyScopedExternalDecls.end()) 5510 Previous.addDecl(Pos->second); 5511 } 5512 5513 bool Redeclaration = false; 5514 5515 // Merge or overload the declaration with an existing declaration of 5516 // the same name, if appropriate. 5517 if (!Previous.empty()) { 5518 // Determine whether NewFD is an overload of PrevDecl or 5519 // a declaration that requires merging. If it's an overload, 5520 // there's no more work to do here; we'll just add the new 5521 // function to the scope. 5522 5523 NamedDecl *OldDecl = 0; 5524 if (!AllowOverloadingOfFunction(Previous, Context)) { 5525 Redeclaration = true; 5526 OldDecl = Previous.getFoundDecl(); 5527 } else { 5528 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5529 /*NewIsUsingDecl*/ false)) { 5530 case Ovl_Match: 5531 Redeclaration = true; 5532 break; 5533 5534 case Ovl_NonFunction: 5535 Redeclaration = true; 5536 break; 5537 5538 case Ovl_Overload: 5539 Redeclaration = false; 5540 break; 5541 } 5542 5543 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5544 // If a function name is overloadable in C, then every function 5545 // with that name must be marked "overloadable". 5546 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5547 << Redeclaration << NewFD; 5548 NamedDecl *OverloadedDecl = 0; 5549 if (Redeclaration) 5550 OverloadedDecl = OldDecl; 5551 else if (!Previous.empty()) 5552 OverloadedDecl = Previous.getRepresentativeDecl(); 5553 if (OverloadedDecl) 5554 Diag(OverloadedDecl->getLocation(), 5555 diag::note_attribute_overloadable_prev_overload); 5556 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5557 Context)); 5558 } 5559 } 5560 5561 if (Redeclaration) { 5562 // NewFD and OldDecl represent declarations that need to be 5563 // merged. 5564 if (MergeFunctionDecl(NewFD, OldDecl)) { 5565 NewFD->setInvalidDecl(); 5566 return Redeclaration; 5567 } 5568 5569 Previous.clear(); 5570 Previous.addDecl(OldDecl); 5571 5572 if (FunctionTemplateDecl *OldTemplateDecl 5573 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5574 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5575 FunctionTemplateDecl *NewTemplateDecl 5576 = NewFD->getDescribedFunctionTemplate(); 5577 assert(NewTemplateDecl && "Template/non-template mismatch"); 5578 if (CXXMethodDecl *Method 5579 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5580 Method->setAccess(OldTemplateDecl->getAccess()); 5581 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5582 } 5583 5584 // If this is an explicit specialization of a member that is a function 5585 // template, mark it as a member specialization. 5586 if (IsExplicitSpecialization && 5587 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5588 NewTemplateDecl->setMemberSpecialization(); 5589 assert(OldTemplateDecl->isMemberSpecialization()); 5590 } 5591 5592 if (OldTemplateDecl->isModulePrivate()) 5593 NewTemplateDecl->setModulePrivate(); 5594 5595 } else { 5596 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5597 NewFD->setAccess(OldDecl->getAccess()); 5598 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5599 } 5600 } 5601 } 5602 5603 // Semantic checking for this function declaration (in isolation). 5604 if (getLangOptions().CPlusPlus) { 5605 // C++-specific checks. 5606 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5607 CheckConstructor(Constructor); 5608 } else if (CXXDestructorDecl *Destructor = 5609 dyn_cast<CXXDestructorDecl>(NewFD)) { 5610 CXXRecordDecl *Record = Destructor->getParent(); 5611 QualType ClassType = Context.getTypeDeclType(Record); 5612 5613 // FIXME: Shouldn't we be able to perform this check even when the class 5614 // type is dependent? Both gcc and edg can handle that. 5615 if (!ClassType->isDependentType()) { 5616 DeclarationName Name 5617 = Context.DeclarationNames.getCXXDestructorName( 5618 Context.getCanonicalType(ClassType)); 5619 if (NewFD->getDeclName() != Name) { 5620 Diag(NewFD->getLocation(), diag::err_destructor_name); 5621 NewFD->setInvalidDecl(); 5622 return Redeclaration; 5623 } 5624 } 5625 } else if (CXXConversionDecl *Conversion 5626 = dyn_cast<CXXConversionDecl>(NewFD)) { 5627 ActOnConversionDeclarator(Conversion); 5628 } 5629 5630 // Find any virtual functions that this function overrides. 5631 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5632 if (!Method->isFunctionTemplateSpecialization() && 5633 !Method->getDescribedFunctionTemplate()) { 5634 if (AddOverriddenMethods(Method->getParent(), Method)) { 5635 // If the function was marked as "static", we have a problem. 5636 if (NewFD->getStorageClass() == SC_Static) { 5637 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5638 << NewFD->getDeclName(); 5639 for (CXXMethodDecl::method_iterator 5640 Overridden = Method->begin_overridden_methods(), 5641 OverriddenEnd = Method->end_overridden_methods(); 5642 Overridden != OverriddenEnd; 5643 ++Overridden) { 5644 Diag((*Overridden)->getLocation(), 5645 diag::note_overridden_virtual_function); 5646 } 5647 } 5648 } 5649 } 5650 } 5651 5652 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5653 if (NewFD->isOverloadedOperator() && 5654 CheckOverloadedOperatorDeclaration(NewFD)) { 5655 NewFD->setInvalidDecl(); 5656 return Redeclaration; 5657 } 5658 5659 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5660 if (NewFD->getLiteralIdentifier() && 5661 CheckLiteralOperatorDeclaration(NewFD)) { 5662 NewFD->setInvalidDecl(); 5663 return Redeclaration; 5664 } 5665 5666 // In C++, check default arguments now that we have merged decls. Unless 5667 // the lexical context is the class, because in this case this is done 5668 // during delayed parsing anyway. 5669 if (!CurContext->isRecord()) 5670 CheckCXXDefaultArguments(NewFD); 5671 5672 // If this function declares a builtin function, check the type of this 5673 // declaration against the expected type for the builtin. 5674 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5675 ASTContext::GetBuiltinTypeError Error; 5676 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5677 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5678 // The type of this function differs from the type of the builtin, 5679 // so forget about the builtin entirely. 5680 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5681 } 5682 } 5683 } 5684 return Redeclaration; 5685} 5686 5687void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5688 // C++ [basic.start.main]p3: A program that declares main to be inline 5689 // or static is ill-formed. 5690 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5691 // shall not appear in a declaration of main. 5692 // static main is not an error under C99, but we should warn about it. 5693 if (FD->getStorageClass() == SC_Static) 5694 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5695 ? diag::err_static_main : diag::warn_static_main) 5696 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5697 if (FD->isInlineSpecified()) 5698 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5699 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5700 5701 QualType T = FD->getType(); 5702 assert(T->isFunctionType() && "function decl is not of function type"); 5703 const FunctionType* FT = T->getAs<FunctionType>(); 5704 5705 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5706 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5707 FD->setInvalidDecl(true); 5708 } 5709 5710 // Treat protoless main() as nullary. 5711 if (isa<FunctionNoProtoType>(FT)) return; 5712 5713 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5714 unsigned nparams = FTP->getNumArgs(); 5715 assert(FD->getNumParams() == nparams); 5716 5717 bool HasExtraParameters = (nparams > 3); 5718 5719 // Darwin passes an undocumented fourth argument of type char**. If 5720 // other platforms start sprouting these, the logic below will start 5721 // getting shifty. 5722 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5723 HasExtraParameters = false; 5724 5725 if (HasExtraParameters) { 5726 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5727 FD->setInvalidDecl(true); 5728 nparams = 3; 5729 } 5730 5731 // FIXME: a lot of the following diagnostics would be improved 5732 // if we had some location information about types. 5733 5734 QualType CharPP = 5735 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5736 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5737 5738 for (unsigned i = 0; i < nparams; ++i) { 5739 QualType AT = FTP->getArgType(i); 5740 5741 bool mismatch = true; 5742 5743 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5744 mismatch = false; 5745 else if (Expected[i] == CharPP) { 5746 // As an extension, the following forms are okay: 5747 // char const ** 5748 // char const * const * 5749 // char * const * 5750 5751 QualifierCollector qs; 5752 const PointerType* PT; 5753 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5754 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5755 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5756 qs.removeConst(); 5757 mismatch = !qs.empty(); 5758 } 5759 } 5760 5761 if (mismatch) { 5762 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5763 // TODO: suggest replacing given type with expected type 5764 FD->setInvalidDecl(true); 5765 } 5766 } 5767 5768 if (nparams == 1 && !FD->isInvalidDecl()) { 5769 Diag(FD->getLocation(), diag::warn_main_one_arg); 5770 } 5771 5772 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5773 Diag(FD->getLocation(), diag::err_main_template_decl); 5774 FD->setInvalidDecl(); 5775 } 5776} 5777 5778bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5779 // FIXME: Need strict checking. In C89, we need to check for 5780 // any assignment, increment, decrement, function-calls, or 5781 // commas outside of a sizeof. In C99, it's the same list, 5782 // except that the aforementioned are allowed in unevaluated 5783 // expressions. Everything else falls under the 5784 // "may accept other forms of constant expressions" exception. 5785 // (We never end up here for C++, so the constant expression 5786 // rules there don't matter.) 5787 if (Init->isConstantInitializer(Context, false)) 5788 return false; 5789 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5790 << Init->getSourceRange(); 5791 return true; 5792} 5793 5794namespace { 5795 // Visits an initialization expression to see if OrigDecl is evaluated in 5796 // its own initialization and throws a warning if it does. 5797 class SelfReferenceChecker 5798 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5799 Sema &S; 5800 Decl *OrigDecl; 5801 bool isRecordType; 5802 bool isPODType; 5803 5804 public: 5805 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5806 5807 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5808 S(S), OrigDecl(OrigDecl) { 5809 isPODType = false; 5810 isRecordType = false; 5811 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5812 isPODType = VD->getType().isPODType(S.Context); 5813 isRecordType = VD->getType()->isRecordType(); 5814 } 5815 } 5816 5817 void VisitExpr(Expr *E) { 5818 if (isa<ObjCMessageExpr>(*E)) return; 5819 if (isRecordType) { 5820 Expr *expr = E; 5821 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5822 ValueDecl *VD = ME->getMemberDecl(); 5823 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5824 expr = ME->getBase(); 5825 } 5826 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5827 HandleDeclRefExpr(DRE); 5828 return; 5829 } 5830 } 5831 Inherited::VisitExpr(E); 5832 } 5833 5834 void VisitMemberExpr(MemberExpr *E) { 5835 if (E->getType()->canDecayToPointerType()) return; 5836 if (isa<FieldDecl>(E->getMemberDecl())) 5837 if (DeclRefExpr *DRE 5838 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5839 HandleDeclRefExpr(DRE); 5840 return; 5841 } 5842 Inherited::VisitMemberExpr(E); 5843 } 5844 5845 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5846 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5847 (isRecordType && E->getCastKind() == CK_NoOp)) { 5848 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5849 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5850 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5851 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5852 HandleDeclRefExpr(DRE); 5853 return; 5854 } 5855 } 5856 Inherited::VisitImplicitCastExpr(E); 5857 } 5858 5859 void VisitUnaryOperator(UnaryOperator *E) { 5860 // For POD record types, addresses of its own members are well-defined. 5861 if (isRecordType && isPODType) return; 5862 Inherited::VisitUnaryOperator(E); 5863 } 5864 5865 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5866 Decl* ReferenceDecl = DRE->getDecl(); 5867 if (OrigDecl != ReferenceDecl) return; 5868 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5869 Sema::NotForRedeclaration); 5870 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5871 S.PDiag(diag::warn_uninit_self_reference_in_init) 5872 << Result.getLookupName() 5873 << OrigDecl->getLocation() 5874 << DRE->getSourceRange()); 5875 } 5876 }; 5877} 5878 5879/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5880void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5881 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5882} 5883 5884/// AddInitializerToDecl - Adds the initializer Init to the 5885/// declaration dcl. If DirectInit is true, this is C++ direct 5886/// initialization rather than copy initialization. 5887void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5888 bool DirectInit, bool TypeMayContainAuto) { 5889 // If there is no declaration, there was an error parsing it. Just ignore 5890 // the initializer. 5891 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5892 return; 5893 5894 // Check for self-references within variable initializers. 5895 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5896 // Variables declared within a function/method body are handled 5897 // by a dataflow analysis. 5898 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5899 CheckSelfReference(RealDecl, Init); 5900 } 5901 else { 5902 CheckSelfReference(RealDecl, Init); 5903 } 5904 5905 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5906 // With declarators parsed the way they are, the parser cannot 5907 // distinguish between a normal initializer and a pure-specifier. 5908 // Thus this grotesque test. 5909 IntegerLiteral *IL; 5910 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5911 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5912 CheckPureMethod(Method, Init->getSourceRange()); 5913 else { 5914 Diag(Method->getLocation(), diag::err_member_function_initialization) 5915 << Method->getDeclName() << Init->getSourceRange(); 5916 Method->setInvalidDecl(); 5917 } 5918 return; 5919 } 5920 5921 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5922 if (!VDecl) { 5923 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5924 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5925 RealDecl->setInvalidDecl(); 5926 return; 5927 } 5928 5929 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5930 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5931 TypeSourceInfo *DeducedType = 0; 5932 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5933 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5934 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5935 << Init->getSourceRange(); 5936 if (!DeducedType) { 5937 RealDecl->setInvalidDecl(); 5938 return; 5939 } 5940 VDecl->setTypeSourceInfo(DeducedType); 5941 VDecl->setType(DeducedType->getType()); 5942 5943 // In ARC, infer lifetime. 5944 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5945 VDecl->setInvalidDecl(); 5946 5947 // If this is a redeclaration, check that the type we just deduced matches 5948 // the previously declared type. 5949 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5950 MergeVarDeclTypes(VDecl, Old); 5951 } 5952 5953 5954 // A definition must end up with a complete type, which means it must be 5955 // complete with the restriction that an array type might be completed by the 5956 // initializer; note that later code assumes this restriction. 5957 QualType BaseDeclType = VDecl->getType(); 5958 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5959 BaseDeclType = Array->getElementType(); 5960 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5961 diag::err_typecheck_decl_incomplete_type)) { 5962 RealDecl->setInvalidDecl(); 5963 return; 5964 } 5965 5966 // The variable can not have an abstract class type. 5967 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5968 diag::err_abstract_type_in_decl, 5969 AbstractVariableType)) 5970 VDecl->setInvalidDecl(); 5971 5972 const VarDecl *Def; 5973 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5974 Diag(VDecl->getLocation(), diag::err_redefinition) 5975 << VDecl->getDeclName(); 5976 Diag(Def->getLocation(), diag::note_previous_definition); 5977 VDecl->setInvalidDecl(); 5978 return; 5979 } 5980 5981 const VarDecl* PrevInit = 0; 5982 if (getLangOptions().CPlusPlus) { 5983 // C++ [class.static.data]p4 5984 // If a static data member is of const integral or const 5985 // enumeration type, its declaration in the class definition can 5986 // specify a constant-initializer which shall be an integral 5987 // constant expression (5.19). In that case, the member can appear 5988 // in integral constant expressions. The member shall still be 5989 // defined in a namespace scope if it is used in the program and the 5990 // namespace scope definition shall not contain an initializer. 5991 // 5992 // We already performed a redefinition check above, but for static 5993 // data members we also need to check whether there was an in-class 5994 // declaration with an initializer. 5995 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5996 Diag(VDecl->getLocation(), diag::err_redefinition) 5997 << VDecl->getDeclName(); 5998 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5999 return; 6000 } 6001 6002 if (VDecl->hasLocalStorage()) 6003 getCurFunction()->setHasBranchProtectedScope(); 6004 6005 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6006 VDecl->setInvalidDecl(); 6007 return; 6008 } 6009 } 6010 6011 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6012 // a kernel function cannot be initialized." 6013 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6014 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6015 VDecl->setInvalidDecl(); 6016 return; 6017 } 6018 6019 // Capture the variable that is being initialized and the style of 6020 // initialization. 6021 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6022 6023 // FIXME: Poor source location information. 6024 InitializationKind Kind 6025 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 6026 Init->getLocStart(), 6027 Init->getLocEnd()) 6028 : InitializationKind::CreateCopy(VDecl->getLocation(), 6029 Init->getLocStart()); 6030 6031 // Get the decls type and save a reference for later, since 6032 // CheckInitializerTypes may change it. 6033 QualType DclT = VDecl->getType(), SavT = DclT; 6034 if (VDecl->isLocalVarDecl()) { 6035 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 6036 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6037 VDecl->setInvalidDecl(); 6038 } else if (!VDecl->isInvalidDecl()) { 6039 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6040 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6041 MultiExprArg(*this, &Init, 1), 6042 &DclT); 6043 if (Result.isInvalid()) { 6044 VDecl->setInvalidDecl(); 6045 return; 6046 } 6047 6048 Init = Result.takeAs<Expr>(); 6049 6050 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6051 // Don't check invalid declarations to avoid emitting useless diagnostics. 6052 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6053 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6054 CheckForConstantInitializer(Init, DclT); 6055 } 6056 } 6057 } else if (VDecl->isStaticDataMember() && 6058 VDecl->getLexicalDeclContext()->isRecord()) { 6059 // This is an in-class initialization for a static data member, e.g., 6060 // 6061 // struct S { 6062 // static const int value = 17; 6063 // }; 6064 6065 // Try to perform the initialization regardless. 6066 if (!VDecl->isInvalidDecl()) { 6067 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6068 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6069 MultiExprArg(*this, &Init, 1), 6070 &DclT); 6071 if (Result.isInvalid()) { 6072 VDecl->setInvalidDecl(); 6073 return; 6074 } 6075 6076 Init = Result.takeAs<Expr>(); 6077 } 6078 6079 // C++ [class.mem]p4: 6080 // A member-declarator can contain a constant-initializer only 6081 // if it declares a static member (9.4) of const integral or 6082 // const enumeration type, see 9.4.2. 6083 // 6084 // C++0x [class.static.data]p3: 6085 // If a non-volatile const static data member is of integral or 6086 // enumeration type, its declaration in the class definition can 6087 // specify a brace-or-equal-initializer in which every initalizer-clause 6088 // that is an assignment-expression is a constant expression. A static 6089 // data member of literal type can be declared in the class definition 6090 // with the constexpr specifier; if so, its declaration shall specify a 6091 // brace-or-equal-initializer in which every initializer-clause that is 6092 // an assignment-expression is a constant expression. 6093 QualType T = VDecl->getType(); 6094 6095 // Do nothing on dependent types. 6096 if (T->isDependentType()) { 6097 6098 // Allow any 'static constexpr' members, whether or not they are of literal 6099 // type. We separately check that the initializer is a constant expression, 6100 // which implicitly requires the member to be of literal type. 6101 } else if (VDecl->isConstexpr()) { 6102 6103 // Require constness. 6104 } else if (!T.isConstQualified()) { 6105 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6106 << Init->getSourceRange(); 6107 VDecl->setInvalidDecl(); 6108 6109 // We allow integer constant expressions in all cases. 6110 } else if (T->isIntegralOrEnumerationType()) { 6111 // Check whether the expression is a constant expression. 6112 SourceLocation Loc; 6113 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6114 // In C++0x, a non-constexpr const static data member with an 6115 // in-class initializer cannot be volatile. 6116 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6117 else if (Init->isValueDependent()) 6118 ; // Nothing to check. 6119 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6120 ; // Ok, it's an ICE! 6121 else if (Init->isEvaluatable(Context)) { 6122 // If we can constant fold the initializer through heroics, accept it, 6123 // but report this as a use of an extension for -pedantic. 6124 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6125 << Init->getSourceRange(); 6126 } else { 6127 // Otherwise, this is some crazy unknown case. Report the issue at the 6128 // location provided by the isIntegerConstantExpr failed check. 6129 Diag(Loc, diag::err_in_class_initializer_non_constant) 6130 << Init->getSourceRange(); 6131 VDecl->setInvalidDecl(); 6132 } 6133 6134 // We allow floating-point constants as an extension. 6135 } else if (T->isFloatingType()) { // also permits complex, which is ok 6136 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6137 << T << Init->getSourceRange(); 6138 if (getLangOptions().CPlusPlus0x) 6139 Diag(VDecl->getLocation(), 6140 diag::note_in_class_initializer_float_type_constexpr) 6141 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6142 6143 if (!Init->isValueDependent() && 6144 !Init->isConstantInitializer(Context, false)) { 6145 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6146 << Init->getSourceRange(); 6147 VDecl->setInvalidDecl(); 6148 } 6149 6150 // Suggest adding 'constexpr' in C++0x for literal types. 6151 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6152 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6153 << T << Init->getSourceRange() 6154 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6155 VDecl->setConstexpr(true); 6156 6157 } else { 6158 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6159 << T << Init->getSourceRange(); 6160 VDecl->setInvalidDecl(); 6161 } 6162 } else if (VDecl->isFileVarDecl()) { 6163 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6164 (!getLangOptions().CPlusPlus || 6165 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6166 Diag(VDecl->getLocation(), diag::warn_extern_init); 6167 if (!VDecl->isInvalidDecl()) { 6168 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6169 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6170 MultiExprArg(*this, &Init, 1), 6171 &DclT); 6172 if (Result.isInvalid()) { 6173 VDecl->setInvalidDecl(); 6174 return; 6175 } 6176 6177 Init = Result.takeAs<Expr>(); 6178 } 6179 6180 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6181 // Don't check invalid declarations to avoid emitting useless diagnostics. 6182 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6183 // C99 6.7.8p4. All file scoped initializers need to be constant. 6184 CheckForConstantInitializer(Init, DclT); 6185 } 6186 } 6187 // If the type changed, it means we had an incomplete type that was 6188 // completed by the initializer. For example: 6189 // int ary[] = { 1, 3, 5 }; 6190 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6191 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6192 VDecl->setType(DclT); 6193 Init->setType(DclT); 6194 } 6195 6196 // Check any implicit conversions within the expression. 6197 CheckImplicitConversions(Init, VDecl->getLocation()); 6198 6199 if (!VDecl->isInvalidDecl()) 6200 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6201 6202 Init = MaybeCreateExprWithCleanups(Init); 6203 // Attach the initializer to the decl. 6204 VDecl->setInit(Init); 6205 6206 CheckCompleteVariableDeclaration(VDecl); 6207} 6208 6209/// ActOnInitializerError - Given that there was an error parsing an 6210/// initializer for the given declaration, try to return to some form 6211/// of sanity. 6212void Sema::ActOnInitializerError(Decl *D) { 6213 // Our main concern here is re-establishing invariants like "a 6214 // variable's type is either dependent or complete". 6215 if (!D || D->isInvalidDecl()) return; 6216 6217 VarDecl *VD = dyn_cast<VarDecl>(D); 6218 if (!VD) return; 6219 6220 // Auto types are meaningless if we can't make sense of the initializer. 6221 if (ParsingInitForAutoVars.count(D)) { 6222 D->setInvalidDecl(); 6223 return; 6224 } 6225 6226 QualType Ty = VD->getType(); 6227 if (Ty->isDependentType()) return; 6228 6229 // Require a complete type. 6230 if (RequireCompleteType(VD->getLocation(), 6231 Context.getBaseElementType(Ty), 6232 diag::err_typecheck_decl_incomplete_type)) { 6233 VD->setInvalidDecl(); 6234 return; 6235 } 6236 6237 // Require an abstract type. 6238 if (RequireNonAbstractType(VD->getLocation(), Ty, 6239 diag::err_abstract_type_in_decl, 6240 AbstractVariableType)) { 6241 VD->setInvalidDecl(); 6242 return; 6243 } 6244 6245 // Don't bother complaining about constructors or destructors, 6246 // though. 6247} 6248 6249void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6250 bool TypeMayContainAuto) { 6251 // If there is no declaration, there was an error parsing it. Just ignore it. 6252 if (RealDecl == 0) 6253 return; 6254 6255 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6256 QualType Type = Var->getType(); 6257 6258 // C++0x [dcl.spec.auto]p3 6259 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6260 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6261 << Var->getDeclName() << Type; 6262 Var->setInvalidDecl(); 6263 return; 6264 } 6265 6266 // C++0x [class.static.data]p3: A static data member can be declared with 6267 // the constexpr specifier; if so, its declaration shall specify 6268 // a brace-or-equal-initializer. 6269 if (Var->isConstexpr() && Var->isStaticDataMember() && 6270 !Var->isThisDeclarationADefinition()) { 6271 Diag(Var->getLocation(), diag::err_constexpr_static_mem_var_requires_init) 6272 << Var->getDeclName(); 6273 Var->setInvalidDecl(); 6274 return; 6275 } 6276 6277 switch (Var->isThisDeclarationADefinition()) { 6278 case VarDecl::Definition: 6279 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6280 break; 6281 6282 // We have an out-of-line definition of a static data member 6283 // that has an in-class initializer, so we type-check this like 6284 // a declaration. 6285 // 6286 // Fall through 6287 6288 case VarDecl::DeclarationOnly: 6289 // It's only a declaration. 6290 6291 // Block scope. C99 6.7p7: If an identifier for an object is 6292 // declared with no linkage (C99 6.2.2p6), the type for the 6293 // object shall be complete. 6294 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6295 !Var->getLinkage() && !Var->isInvalidDecl() && 6296 RequireCompleteType(Var->getLocation(), Type, 6297 diag::err_typecheck_decl_incomplete_type)) 6298 Var->setInvalidDecl(); 6299 6300 // Make sure that the type is not abstract. 6301 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6302 RequireNonAbstractType(Var->getLocation(), Type, 6303 diag::err_abstract_type_in_decl, 6304 AbstractVariableType)) 6305 Var->setInvalidDecl(); 6306 return; 6307 6308 case VarDecl::TentativeDefinition: 6309 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6310 // object that has file scope without an initializer, and without a 6311 // storage-class specifier or with the storage-class specifier "static", 6312 // constitutes a tentative definition. Note: A tentative definition with 6313 // external linkage is valid (C99 6.2.2p5). 6314 if (!Var->isInvalidDecl()) { 6315 if (const IncompleteArrayType *ArrayT 6316 = Context.getAsIncompleteArrayType(Type)) { 6317 if (RequireCompleteType(Var->getLocation(), 6318 ArrayT->getElementType(), 6319 diag::err_illegal_decl_array_incomplete_type)) 6320 Var->setInvalidDecl(); 6321 } else if (Var->getStorageClass() == SC_Static) { 6322 // C99 6.9.2p3: If the declaration of an identifier for an object is 6323 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6324 // declared type shall not be an incomplete type. 6325 // NOTE: code such as the following 6326 // static struct s; 6327 // struct s { int a; }; 6328 // is accepted by gcc. Hence here we issue a warning instead of 6329 // an error and we do not invalidate the static declaration. 6330 // NOTE: to avoid multiple warnings, only check the first declaration. 6331 if (Var->getPreviousDeclaration() == 0) 6332 RequireCompleteType(Var->getLocation(), Type, 6333 diag::ext_typecheck_decl_incomplete_type); 6334 } 6335 } 6336 6337 // Record the tentative definition; we're done. 6338 if (!Var->isInvalidDecl()) 6339 TentativeDefinitions.push_back(Var); 6340 return; 6341 } 6342 6343 // Provide a specific diagnostic for uninitialized variable 6344 // definitions with incomplete array type. 6345 if (Type->isIncompleteArrayType()) { 6346 Diag(Var->getLocation(), 6347 diag::err_typecheck_incomplete_array_needs_initializer); 6348 Var->setInvalidDecl(); 6349 return; 6350 } 6351 6352 // Provide a specific diagnostic for uninitialized variable 6353 // definitions with reference type. 6354 if (Type->isReferenceType()) { 6355 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6356 << Var->getDeclName() 6357 << SourceRange(Var->getLocation(), Var->getLocation()); 6358 Var->setInvalidDecl(); 6359 return; 6360 } 6361 6362 // Do not attempt to type-check the default initializer for a 6363 // variable with dependent type. 6364 if (Type->isDependentType()) 6365 return; 6366 6367 if (Var->isInvalidDecl()) 6368 return; 6369 6370 if (RequireCompleteType(Var->getLocation(), 6371 Context.getBaseElementType(Type), 6372 diag::err_typecheck_decl_incomplete_type)) { 6373 Var->setInvalidDecl(); 6374 return; 6375 } 6376 6377 // The variable can not have an abstract class type. 6378 if (RequireNonAbstractType(Var->getLocation(), Type, 6379 diag::err_abstract_type_in_decl, 6380 AbstractVariableType)) { 6381 Var->setInvalidDecl(); 6382 return; 6383 } 6384 6385 // Check for jumps past the implicit initializer. C++0x 6386 // clarifies that this applies to a "variable with automatic 6387 // storage duration", not a "local variable". 6388 // C++11 [stmt.dcl]p3 6389 // A program that jumps from a point where a variable with automatic 6390 // storage duration is not in scope to a point where it is in scope is 6391 // ill-formed unless the variable has scalar type, class type with a 6392 // trivial default constructor and a trivial destructor, a cv-qualified 6393 // version of one of these types, or an array of one of the preceding 6394 // types and is declared without an initializer. 6395 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6396 if (const RecordType *Record 6397 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6398 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6399 // Mark the function for further checking even if the looser rules of 6400 // C++11 do not require such checks, so that we can diagnose 6401 // incompatibilities with C++98. 6402 if (!CXXRecord->isPOD()) 6403 getCurFunction()->setHasBranchProtectedScope(); 6404 } 6405 } 6406 6407 // C++03 [dcl.init]p9: 6408 // If no initializer is specified for an object, and the 6409 // object is of (possibly cv-qualified) non-POD class type (or 6410 // array thereof), the object shall be default-initialized; if 6411 // the object is of const-qualified type, the underlying class 6412 // type shall have a user-declared default 6413 // constructor. Otherwise, if no initializer is specified for 6414 // a non- static object, the object and its subobjects, if 6415 // any, have an indeterminate initial value); if the object 6416 // or any of its subobjects are of const-qualified type, the 6417 // program is ill-formed. 6418 // C++0x [dcl.init]p11: 6419 // If no initializer is specified for an object, the object is 6420 // default-initialized; [...]. 6421 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6422 InitializationKind Kind 6423 = InitializationKind::CreateDefault(Var->getLocation()); 6424 6425 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6426 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6427 MultiExprArg(*this, 0, 0)); 6428 if (Init.isInvalid()) 6429 Var->setInvalidDecl(); 6430 else if (Init.get()) 6431 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6432 6433 CheckCompleteVariableDeclaration(Var); 6434 } 6435} 6436 6437void Sema::ActOnCXXForRangeDecl(Decl *D) { 6438 VarDecl *VD = dyn_cast<VarDecl>(D); 6439 if (!VD) { 6440 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6441 D->setInvalidDecl(); 6442 return; 6443 } 6444 6445 VD->setCXXForRangeDecl(true); 6446 6447 // for-range-declaration cannot be given a storage class specifier. 6448 int Error = -1; 6449 switch (VD->getStorageClassAsWritten()) { 6450 case SC_None: 6451 break; 6452 case SC_Extern: 6453 Error = 0; 6454 break; 6455 case SC_Static: 6456 Error = 1; 6457 break; 6458 case SC_PrivateExtern: 6459 Error = 2; 6460 break; 6461 case SC_Auto: 6462 Error = 3; 6463 break; 6464 case SC_Register: 6465 Error = 4; 6466 break; 6467 case SC_OpenCLWorkGroupLocal: 6468 llvm_unreachable("Unexpected storage class"); 6469 } 6470 if (VD->isConstexpr()) 6471 Error = 5; 6472 if (Error != -1) { 6473 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6474 << VD->getDeclName() << Error; 6475 D->setInvalidDecl(); 6476 } 6477} 6478 6479void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6480 if (var->isInvalidDecl()) return; 6481 6482 // In ARC, don't allow jumps past the implicit initialization of a 6483 // local retaining variable. 6484 if (getLangOptions().ObjCAutoRefCount && 6485 var->hasLocalStorage()) { 6486 switch (var->getType().getObjCLifetime()) { 6487 case Qualifiers::OCL_None: 6488 case Qualifiers::OCL_ExplicitNone: 6489 case Qualifiers::OCL_Autoreleasing: 6490 break; 6491 6492 case Qualifiers::OCL_Weak: 6493 case Qualifiers::OCL_Strong: 6494 getCurFunction()->setHasBranchProtectedScope(); 6495 break; 6496 } 6497 } 6498 6499 // All the following checks are C++ only. 6500 if (!getLangOptions().CPlusPlus) return; 6501 6502 QualType baseType = Context.getBaseElementType(var->getType()); 6503 if (baseType->isDependentType()) return; 6504 6505 // __block variables might require us to capture a copy-initializer. 6506 if (var->hasAttr<BlocksAttr>()) { 6507 // It's currently invalid to ever have a __block variable with an 6508 // array type; should we diagnose that here? 6509 6510 // Regardless, we don't want to ignore array nesting when 6511 // constructing this copy. 6512 QualType type = var->getType(); 6513 6514 if (type->isStructureOrClassType()) { 6515 SourceLocation poi = var->getLocation(); 6516 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6517 ExprResult result = 6518 PerformCopyInitialization( 6519 InitializedEntity::InitializeBlock(poi, type, false), 6520 poi, Owned(varRef)); 6521 if (!result.isInvalid()) { 6522 result = MaybeCreateExprWithCleanups(result); 6523 Expr *init = result.takeAs<Expr>(); 6524 Context.setBlockVarCopyInits(var, init); 6525 } 6526 } 6527 } 6528 6529 Expr *Init = var->getInit(); 6530 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6531 6532 if (!var->getDeclContext()->isDependentContext() && 6533 (var->isConstexpr() || IsGlobal) && Init && 6534 !Init->isConstantInitializer(Context, baseType->isReferenceType())) { 6535 // FIXME: Improve this diagnostic to explain why the initializer is not 6536 // a constant expression. 6537 if (var->isConstexpr()) 6538 Diag(var->getLocation(), diag::err_constexpr_var_requires_const_init) 6539 << var << Init->getSourceRange(); 6540 if (IsGlobal) 6541 Diag(var->getLocation(), diag::warn_global_constructor) 6542 << Init->getSourceRange(); 6543 } 6544 6545 // Require the destructor. 6546 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6547 FinalizeVarWithDestructor(var, recordType); 6548} 6549 6550/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6551/// any semantic actions necessary after any initializer has been attached. 6552void 6553Sema::FinalizeDeclaration(Decl *ThisDecl) { 6554 // Note that we are no longer parsing the initializer for this declaration. 6555 ParsingInitForAutoVars.erase(ThisDecl); 6556} 6557 6558Sema::DeclGroupPtrTy 6559Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6560 Decl **Group, unsigned NumDecls) { 6561 SmallVector<Decl*, 8> Decls; 6562 6563 if (DS.isTypeSpecOwned()) 6564 Decls.push_back(DS.getRepAsDecl()); 6565 6566 for (unsigned i = 0; i != NumDecls; ++i) 6567 if (Decl *D = Group[i]) 6568 Decls.push_back(D); 6569 6570 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6571 DS.getTypeSpecType() == DeclSpec::TST_auto); 6572} 6573 6574/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6575/// group, performing any necessary semantic checking. 6576Sema::DeclGroupPtrTy 6577Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6578 bool TypeMayContainAuto) { 6579 // C++0x [dcl.spec.auto]p7: 6580 // If the type deduced for the template parameter U is not the same in each 6581 // deduction, the program is ill-formed. 6582 // FIXME: When initializer-list support is added, a distinction is needed 6583 // between the deduced type U and the deduced type which 'auto' stands for. 6584 // auto a = 0, b = { 1, 2, 3 }; 6585 // is legal because the deduced type U is 'int' in both cases. 6586 if (TypeMayContainAuto && NumDecls > 1) { 6587 QualType Deduced; 6588 CanQualType DeducedCanon; 6589 VarDecl *DeducedDecl = 0; 6590 for (unsigned i = 0; i != NumDecls; ++i) { 6591 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6592 AutoType *AT = D->getType()->getContainedAutoType(); 6593 // Don't reissue diagnostics when instantiating a template. 6594 if (AT && D->isInvalidDecl()) 6595 break; 6596 if (AT && AT->isDeduced()) { 6597 QualType U = AT->getDeducedType(); 6598 CanQualType UCanon = Context.getCanonicalType(U); 6599 if (Deduced.isNull()) { 6600 Deduced = U; 6601 DeducedCanon = UCanon; 6602 DeducedDecl = D; 6603 } else if (DeducedCanon != UCanon) { 6604 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6605 diag::err_auto_different_deductions) 6606 << Deduced << DeducedDecl->getDeclName() 6607 << U << D->getDeclName() 6608 << DeducedDecl->getInit()->getSourceRange() 6609 << D->getInit()->getSourceRange(); 6610 D->setInvalidDecl(); 6611 break; 6612 } 6613 } 6614 } 6615 } 6616 } 6617 6618 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6619} 6620 6621 6622/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6623/// to introduce parameters into function prototype scope. 6624Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6625 const DeclSpec &DS = D.getDeclSpec(); 6626 6627 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6628 // C++03 [dcl.stc]p2 also permits 'auto'. 6629 VarDecl::StorageClass StorageClass = SC_None; 6630 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6631 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6632 StorageClass = SC_Register; 6633 StorageClassAsWritten = SC_Register; 6634 } else if (getLangOptions().CPlusPlus && 6635 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6636 StorageClass = SC_Auto; 6637 StorageClassAsWritten = SC_Auto; 6638 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6639 Diag(DS.getStorageClassSpecLoc(), 6640 diag::err_invalid_storage_class_in_func_decl); 6641 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6642 } 6643 6644 if (D.getDeclSpec().isThreadSpecified()) 6645 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6646 if (D.getDeclSpec().isConstexprSpecified()) 6647 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6648 << 0; 6649 6650 DiagnoseFunctionSpecifiers(D); 6651 6652 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6653 QualType parmDeclType = TInfo->getType(); 6654 6655 if (getLangOptions().CPlusPlus) { 6656 // Check that there are no default arguments inside the type of this 6657 // parameter. 6658 CheckExtraCXXDefaultArguments(D); 6659 6660 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6661 if (D.getCXXScopeSpec().isSet()) { 6662 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6663 << D.getCXXScopeSpec().getRange(); 6664 D.getCXXScopeSpec().clear(); 6665 } 6666 } 6667 6668 // Ensure we have a valid name 6669 IdentifierInfo *II = 0; 6670 if (D.hasName()) { 6671 II = D.getIdentifier(); 6672 if (!II) { 6673 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6674 << GetNameForDeclarator(D).getName().getAsString(); 6675 D.setInvalidType(true); 6676 } 6677 } 6678 6679 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6680 if (II) { 6681 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6682 ForRedeclaration); 6683 LookupName(R, S); 6684 if (R.isSingleResult()) { 6685 NamedDecl *PrevDecl = R.getFoundDecl(); 6686 if (PrevDecl->isTemplateParameter()) { 6687 // Maybe we will complain about the shadowed template parameter. 6688 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6689 // Just pretend that we didn't see the previous declaration. 6690 PrevDecl = 0; 6691 } else if (S->isDeclScope(PrevDecl)) { 6692 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6693 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6694 6695 // Recover by removing the name 6696 II = 0; 6697 D.SetIdentifier(0, D.getIdentifierLoc()); 6698 D.setInvalidType(true); 6699 } 6700 } 6701 } 6702 6703 // Temporarily put parameter variables in the translation unit, not 6704 // the enclosing context. This prevents them from accidentally 6705 // looking like class members in C++. 6706 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6707 D.getSourceRange().getBegin(), 6708 D.getIdentifierLoc(), II, 6709 parmDeclType, TInfo, 6710 StorageClass, StorageClassAsWritten); 6711 6712 if (D.isInvalidType()) 6713 New->setInvalidDecl(); 6714 6715 assert(S->isFunctionPrototypeScope()); 6716 assert(S->getFunctionPrototypeDepth() >= 1); 6717 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6718 S->getNextFunctionPrototypeIndex()); 6719 6720 // Add the parameter declaration into this scope. 6721 S->AddDecl(New); 6722 if (II) 6723 IdResolver.AddDecl(New); 6724 6725 ProcessDeclAttributes(S, New, D); 6726 6727 if (D.getDeclSpec().isModulePrivateSpecified()) 6728 Diag(New->getLocation(), diag::err_module_private_local) 6729 << 1 << New->getDeclName() 6730 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6731 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6732 6733 if (New->hasAttr<BlocksAttr>()) { 6734 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6735 } 6736 return New; 6737} 6738 6739/// \brief Synthesizes a variable for a parameter arising from a 6740/// typedef. 6741ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6742 SourceLocation Loc, 6743 QualType T) { 6744 /* FIXME: setting StartLoc == Loc. 6745 Would it be worth to modify callers so as to provide proper source 6746 location for the unnamed parameters, embedding the parameter's type? */ 6747 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6748 T, Context.getTrivialTypeSourceInfo(T, Loc), 6749 SC_None, SC_None, 0); 6750 Param->setImplicit(); 6751 return Param; 6752} 6753 6754void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6755 ParmVarDecl * const *ParamEnd) { 6756 // Don't diagnose unused-parameter errors in template instantiations; we 6757 // will already have done so in the template itself. 6758 if (!ActiveTemplateInstantiations.empty()) 6759 return; 6760 6761 for (; Param != ParamEnd; ++Param) { 6762 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6763 !(*Param)->hasAttr<UnusedAttr>()) { 6764 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6765 << (*Param)->getDeclName(); 6766 } 6767 } 6768} 6769 6770void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6771 ParmVarDecl * const *ParamEnd, 6772 QualType ReturnTy, 6773 NamedDecl *D) { 6774 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6775 return; 6776 6777 // Warn if the return value is pass-by-value and larger than the specified 6778 // threshold. 6779 if (ReturnTy.isPODType(Context)) { 6780 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6781 if (Size > LangOpts.NumLargeByValueCopy) 6782 Diag(D->getLocation(), diag::warn_return_value_size) 6783 << D->getDeclName() << Size; 6784 } 6785 6786 // Warn if any parameter is pass-by-value and larger than the specified 6787 // threshold. 6788 for (; Param != ParamEnd; ++Param) { 6789 QualType T = (*Param)->getType(); 6790 if (!T.isPODType(Context)) 6791 continue; 6792 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6793 if (Size > LangOpts.NumLargeByValueCopy) 6794 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6795 << (*Param)->getDeclName() << Size; 6796 } 6797} 6798 6799ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6800 SourceLocation NameLoc, IdentifierInfo *Name, 6801 QualType T, TypeSourceInfo *TSInfo, 6802 VarDecl::StorageClass StorageClass, 6803 VarDecl::StorageClass StorageClassAsWritten) { 6804 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6805 if (getLangOptions().ObjCAutoRefCount && 6806 T.getObjCLifetime() == Qualifiers::OCL_None && 6807 T->isObjCLifetimeType()) { 6808 6809 Qualifiers::ObjCLifetime lifetime; 6810 6811 // Special cases for arrays: 6812 // - if it's const, use __unsafe_unretained 6813 // - otherwise, it's an error 6814 if (T->isArrayType()) { 6815 if (!T.isConstQualified()) { 6816 DelayedDiagnostics.add( 6817 sema::DelayedDiagnostic::makeForbiddenType( 6818 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6819 } 6820 lifetime = Qualifiers::OCL_ExplicitNone; 6821 } else { 6822 lifetime = T->getObjCARCImplicitLifetime(); 6823 } 6824 T = Context.getLifetimeQualifiedType(T, lifetime); 6825 } 6826 6827 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6828 Context.getAdjustedParameterType(T), 6829 TSInfo, 6830 StorageClass, StorageClassAsWritten, 6831 0); 6832 6833 // Parameters can not be abstract class types. 6834 // For record types, this is done by the AbstractClassUsageDiagnoser once 6835 // the class has been completely parsed. 6836 if (!CurContext->isRecord() && 6837 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6838 AbstractParamType)) 6839 New->setInvalidDecl(); 6840 6841 // Parameter declarators cannot be interface types. All ObjC objects are 6842 // passed by reference. 6843 if (T->isObjCObjectType()) { 6844 Diag(NameLoc, 6845 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6846 << FixItHint::CreateInsertion(NameLoc, "*"); 6847 T = Context.getObjCObjectPointerType(T); 6848 New->setType(T); 6849 } 6850 6851 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6852 // duration shall not be qualified by an address-space qualifier." 6853 // Since all parameters have automatic store duration, they can not have 6854 // an address space. 6855 if (T.getAddressSpace() != 0) { 6856 Diag(NameLoc, diag::err_arg_with_address_space); 6857 New->setInvalidDecl(); 6858 } 6859 6860 return New; 6861} 6862 6863void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6864 SourceLocation LocAfterDecls) { 6865 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6866 6867 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6868 // for a K&R function. 6869 if (!FTI.hasPrototype) { 6870 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6871 --i; 6872 if (FTI.ArgInfo[i].Param == 0) { 6873 llvm::SmallString<256> Code; 6874 llvm::raw_svector_ostream(Code) << " int " 6875 << FTI.ArgInfo[i].Ident->getName() 6876 << ";\n"; 6877 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6878 << FTI.ArgInfo[i].Ident 6879 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6880 6881 // Implicitly declare the argument as type 'int' for lack of a better 6882 // type. 6883 AttributeFactory attrs; 6884 DeclSpec DS(attrs); 6885 const char* PrevSpec; // unused 6886 unsigned DiagID; // unused 6887 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6888 PrevSpec, DiagID); 6889 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6890 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6891 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6892 } 6893 } 6894 } 6895} 6896 6897Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6898 Declarator &D) { 6899 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6900 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6901 Scope *ParentScope = FnBodyScope->getParent(); 6902 6903 D.setFunctionDefinitionKind(FDK_Definition); 6904 Decl *DP = HandleDeclarator(ParentScope, D, 6905 MultiTemplateParamsArg(*this)); 6906 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6907} 6908 6909static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6910 // Don't warn about invalid declarations. 6911 if (FD->isInvalidDecl()) 6912 return false; 6913 6914 // Or declarations that aren't global. 6915 if (!FD->isGlobal()) 6916 return false; 6917 6918 // Don't warn about C++ member functions. 6919 if (isa<CXXMethodDecl>(FD)) 6920 return false; 6921 6922 // Don't warn about 'main'. 6923 if (FD->isMain()) 6924 return false; 6925 6926 // Don't warn about inline functions. 6927 if (FD->isInlined()) 6928 return false; 6929 6930 // Don't warn about function templates. 6931 if (FD->getDescribedFunctionTemplate()) 6932 return false; 6933 6934 // Don't warn about function template specializations. 6935 if (FD->isFunctionTemplateSpecialization()) 6936 return false; 6937 6938 bool MissingPrototype = true; 6939 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6940 Prev; Prev = Prev->getPreviousDeclaration()) { 6941 // Ignore any declarations that occur in function or method 6942 // scope, because they aren't visible from the header. 6943 if (Prev->getDeclContext()->isFunctionOrMethod()) 6944 continue; 6945 6946 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6947 break; 6948 } 6949 6950 return MissingPrototype; 6951} 6952 6953void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6954 // Don't complain if we're in GNU89 mode and the previous definition 6955 // was an extern inline function. 6956 const FunctionDecl *Definition; 6957 if (FD->isDefined(Definition) && 6958 !canRedefineFunction(Definition, getLangOptions())) { 6959 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6960 Definition->getStorageClass() == SC_Extern) 6961 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6962 << FD->getDeclName() << getLangOptions().CPlusPlus; 6963 else 6964 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6965 Diag(Definition->getLocation(), diag::note_previous_definition); 6966 } 6967} 6968 6969Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6970 // Clear the last template instantiation error context. 6971 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6972 6973 if (!D) 6974 return D; 6975 FunctionDecl *FD = 0; 6976 6977 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6978 FD = FunTmpl->getTemplatedDecl(); 6979 else 6980 FD = cast<FunctionDecl>(D); 6981 6982 // Enter a new function scope 6983 PushFunctionScope(); 6984 6985 // See if this is a redefinition. 6986 if (!FD->isLateTemplateParsed()) 6987 CheckForFunctionRedefinition(FD); 6988 6989 // Builtin functions cannot be defined. 6990 if (unsigned BuiltinID = FD->getBuiltinID()) { 6991 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6992 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6993 FD->setInvalidDecl(); 6994 } 6995 } 6996 6997 // The return type of a function definition must be complete 6998 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6999 QualType ResultType = FD->getResultType(); 7000 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7001 !FD->isInvalidDecl() && 7002 RequireCompleteType(FD->getLocation(), ResultType, 7003 diag::err_func_def_incomplete_result)) 7004 FD->setInvalidDecl(); 7005 7006 // GNU warning -Wmissing-prototypes: 7007 // Warn if a global function is defined without a previous 7008 // prototype declaration. This warning is issued even if the 7009 // definition itself provides a prototype. The aim is to detect 7010 // global functions that fail to be declared in header files. 7011 if (ShouldWarnAboutMissingPrototype(FD)) 7012 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7013 7014 if (FnBodyScope) 7015 PushDeclContext(FnBodyScope, FD); 7016 7017 // Check the validity of our function parameters 7018 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7019 /*CheckParameterNames=*/true); 7020 7021 // Introduce our parameters into the function scope 7022 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7023 ParmVarDecl *Param = FD->getParamDecl(p); 7024 Param->setOwningFunction(FD); 7025 7026 // If this has an identifier, add it to the scope stack. 7027 if (Param->getIdentifier() && FnBodyScope) { 7028 CheckShadow(FnBodyScope, Param); 7029 7030 PushOnScopeChains(Param, FnBodyScope); 7031 } 7032 } 7033 7034 // Checking attributes of current function definition 7035 // dllimport attribute. 7036 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7037 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7038 // dllimport attribute cannot be directly applied to definition. 7039 // Microsoft accepts dllimport for functions defined within class scope. 7040 if (!DA->isInherited() && 7041 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7042 Diag(FD->getLocation(), 7043 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7044 << "dllimport"; 7045 FD->setInvalidDecl(); 7046 return FD; 7047 } 7048 7049 // Visual C++ appears to not think this is an issue, so only issue 7050 // a warning when Microsoft extensions are disabled. 7051 if (!LangOpts.MicrosoftExt) { 7052 // If a symbol previously declared dllimport is later defined, the 7053 // attribute is ignored in subsequent references, and a warning is 7054 // emitted. 7055 Diag(FD->getLocation(), 7056 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7057 << FD->getName() << "dllimport"; 7058 } 7059 } 7060 return FD; 7061} 7062 7063/// \brief Given the set of return statements within a function body, 7064/// compute the variables that are subject to the named return value 7065/// optimization. 7066/// 7067/// Each of the variables that is subject to the named return value 7068/// optimization will be marked as NRVO variables in the AST, and any 7069/// return statement that has a marked NRVO variable as its NRVO candidate can 7070/// use the named return value optimization. 7071/// 7072/// This function applies a very simplistic algorithm for NRVO: if every return 7073/// statement in the function has the same NRVO candidate, that candidate is 7074/// the NRVO variable. 7075/// 7076/// FIXME: Employ a smarter algorithm that accounts for multiple return 7077/// statements and the lifetimes of the NRVO candidates. We should be able to 7078/// find a maximal set of NRVO variables. 7079void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7080 ReturnStmt **Returns = Scope->Returns.data(); 7081 7082 const VarDecl *NRVOCandidate = 0; 7083 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7084 if (!Returns[I]->getNRVOCandidate()) 7085 return; 7086 7087 if (!NRVOCandidate) 7088 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7089 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7090 return; 7091 } 7092 7093 if (NRVOCandidate) 7094 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7095} 7096 7097Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7098 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7099} 7100 7101Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7102 bool IsInstantiation) { 7103 FunctionDecl *FD = 0; 7104 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7105 if (FunTmpl) 7106 FD = FunTmpl->getTemplatedDecl(); 7107 else 7108 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7109 7110 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7111 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7112 7113 if (FD) { 7114 FD->setBody(Body); 7115 if (FD->isMain()) { 7116 // C and C++ allow for main to automagically return 0. 7117 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7118 FD->setHasImplicitReturnZero(true); 7119 WP.disableCheckFallThrough(); 7120 } else if (FD->hasAttr<NakedAttr>()) { 7121 // If the function is marked 'naked', don't complain about missing return 7122 // statements. 7123 WP.disableCheckFallThrough(); 7124 } 7125 7126 // MSVC permits the use of pure specifier (=0) on function definition, 7127 // defined at class scope, warn about this non standard construct. 7128 if (getLangOptions().MicrosoftExt && FD->isPure()) 7129 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7130 7131 if (!FD->isInvalidDecl()) { 7132 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7133 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7134 FD->getResultType(), FD); 7135 7136 // If this is a constructor, we need a vtable. 7137 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7138 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7139 7140 computeNRVO(Body, getCurFunction()); 7141 } 7142 7143 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7144 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7145 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7146 MD->setBody(Body); 7147 if (Body) 7148 MD->setEndLoc(Body->getLocEnd()); 7149 if (!MD->isInvalidDecl()) { 7150 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7151 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7152 MD->getResultType(), MD); 7153 7154 if (Body) 7155 computeNRVO(Body, getCurFunction()); 7156 } 7157 if (ObjCShouldCallSuperDealloc) { 7158 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7159 ObjCShouldCallSuperDealloc = false; 7160 } 7161 if (ObjCShouldCallSuperFinalize) { 7162 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7163 ObjCShouldCallSuperFinalize = false; 7164 } 7165 } else { 7166 return 0; 7167 } 7168 7169 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7170 "ObjC methods, which should have been handled in the block above."); 7171 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7172 "ObjC methods, which should have been handled in the block above."); 7173 7174 // Verify and clean out per-function state. 7175 if (Body) { 7176 // C++ constructors that have function-try-blocks can't have return 7177 // statements in the handlers of that block. (C++ [except.handle]p14) 7178 // Verify this. 7179 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7180 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7181 7182 // Verify that gotos and switch cases don't jump into scopes illegally. 7183 if (getCurFunction()->NeedsScopeChecking() && 7184 !dcl->isInvalidDecl() && 7185 !hasAnyUnrecoverableErrorsInThisFunction()) 7186 DiagnoseInvalidJumps(Body); 7187 7188 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7189 if (!Destructor->getParent()->isDependentType()) 7190 CheckDestructor(Destructor); 7191 7192 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7193 Destructor->getParent()); 7194 } 7195 7196 // If any errors have occurred, clear out any temporaries that may have 7197 // been leftover. This ensures that these temporaries won't be picked up for 7198 // deletion in some later function. 7199 if (PP.getDiagnostics().hasErrorOccurred() || 7200 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7201 DiscardCleanupsInEvaluationContext(); 7202 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7203 // Since the body is valid, issue any analysis-based warnings that are 7204 // enabled. 7205 ActivePolicy = &WP; 7206 } 7207 7208 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7209 !CheckConstexprFunctionBody(FD, Body)) 7210 FD->setInvalidDecl(); 7211 7212 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7213 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7214 } 7215 7216 if (!IsInstantiation) 7217 PopDeclContext(); 7218 7219 PopFunctionOrBlockScope(ActivePolicy, dcl); 7220 7221 // If any errors have occurred, clear out any temporaries that may have 7222 // been leftover. This ensures that these temporaries won't be picked up for 7223 // deletion in some later function. 7224 if (getDiagnostics().hasErrorOccurred()) { 7225 DiscardCleanupsInEvaluationContext(); 7226 } 7227 7228 return dcl; 7229} 7230 7231 7232/// When we finish delayed parsing of an attribute, we must attach it to the 7233/// relevant Decl. 7234void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7235 ParsedAttributes &Attrs) { 7236 ProcessDeclAttributeList(S, D, Attrs.getList()); 7237} 7238 7239 7240/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7241/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7242NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7243 IdentifierInfo &II, Scope *S) { 7244 // Before we produce a declaration for an implicitly defined 7245 // function, see whether there was a locally-scoped declaration of 7246 // this name as a function or variable. If so, use that 7247 // (non-visible) declaration, and complain about it. 7248 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7249 = findLocallyScopedExternalDecl(&II); 7250 if (Pos != LocallyScopedExternalDecls.end()) { 7251 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7252 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7253 return Pos->second; 7254 } 7255 7256 // Extension in C99. Legal in C90, but warn about it. 7257 if (II.getName().startswith("__builtin_")) 7258 Diag(Loc, diag::warn_builtin_unknown) << &II; 7259 else if (getLangOptions().C99) 7260 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7261 else 7262 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7263 7264 // Set a Declarator for the implicit definition: int foo(); 7265 const char *Dummy; 7266 AttributeFactory attrFactory; 7267 DeclSpec DS(attrFactory); 7268 unsigned DiagID; 7269 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7270 (void)Error; // Silence warning. 7271 assert(!Error && "Error setting up implicit decl!"); 7272 Declarator D(DS, Declarator::BlockContext); 7273 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7274 0, 0, true, SourceLocation(), 7275 SourceLocation(), SourceLocation(), 7276 SourceLocation(), 7277 EST_None, SourceLocation(), 7278 0, 0, 0, 0, Loc, Loc, D), 7279 DS.getAttributes(), 7280 SourceLocation()); 7281 D.SetIdentifier(&II, Loc); 7282 7283 // Insert this function into translation-unit scope. 7284 7285 DeclContext *PrevDC = CurContext; 7286 CurContext = Context.getTranslationUnitDecl(); 7287 7288 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7289 FD->setImplicit(); 7290 7291 CurContext = PrevDC; 7292 7293 AddKnownFunctionAttributes(FD); 7294 7295 return FD; 7296} 7297 7298/// \brief Adds any function attributes that we know a priori based on 7299/// the declaration of this function. 7300/// 7301/// These attributes can apply both to implicitly-declared builtins 7302/// (like __builtin___printf_chk) or to library-declared functions 7303/// like NSLog or printf. 7304/// 7305/// We need to check for duplicate attributes both here and where user-written 7306/// attributes are applied to declarations. 7307void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7308 if (FD->isInvalidDecl()) 7309 return; 7310 7311 // If this is a built-in function, map its builtin attributes to 7312 // actual attributes. 7313 if (unsigned BuiltinID = FD->getBuiltinID()) { 7314 // Handle printf-formatting attributes. 7315 unsigned FormatIdx; 7316 bool HasVAListArg; 7317 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7318 if (!FD->getAttr<FormatAttr>()) 7319 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7320 "printf", FormatIdx+1, 7321 HasVAListArg ? 0 : FormatIdx+2)); 7322 } 7323 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7324 HasVAListArg)) { 7325 if (!FD->getAttr<FormatAttr>()) 7326 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7327 "scanf", FormatIdx+1, 7328 HasVAListArg ? 0 : FormatIdx+2)); 7329 } 7330 7331 // Mark const if we don't care about errno and that is the only 7332 // thing preventing the function from being const. This allows 7333 // IRgen to use LLVM intrinsics for such functions. 7334 if (!getLangOptions().MathErrno && 7335 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7336 if (!FD->getAttr<ConstAttr>()) 7337 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7338 } 7339 7340 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7341 !FD->getAttr<ReturnsTwiceAttr>()) 7342 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7343 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7344 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7345 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7346 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7347 } 7348 7349 IdentifierInfo *Name = FD->getIdentifier(); 7350 if (!Name) 7351 return; 7352 if ((!getLangOptions().CPlusPlus && 7353 FD->getDeclContext()->isTranslationUnit()) || 7354 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7355 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7356 LinkageSpecDecl::lang_c)) { 7357 // Okay: this could be a libc/libm/Objective-C function we know 7358 // about. 7359 } else 7360 return; 7361 7362 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7363 // FIXME: NSLog and NSLogv should be target specific 7364 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7365 // FIXME: We known better than our headers. 7366 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7367 } else 7368 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7369 "printf", 1, 7370 Name->isStr("NSLogv") ? 0 : 2)); 7371 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7372 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7373 // target-specific builtins, perhaps? 7374 if (!FD->getAttr<FormatAttr>()) 7375 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7376 "printf", 2, 7377 Name->isStr("vasprintf") ? 0 : 3)); 7378 } 7379} 7380 7381TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7382 TypeSourceInfo *TInfo) { 7383 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7384 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7385 7386 if (!TInfo) { 7387 assert(D.isInvalidType() && "no declarator info for valid type"); 7388 TInfo = Context.getTrivialTypeSourceInfo(T); 7389 } 7390 7391 // Scope manipulation handled by caller. 7392 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7393 D.getSourceRange().getBegin(), 7394 D.getIdentifierLoc(), 7395 D.getIdentifier(), 7396 TInfo); 7397 7398 // Bail out immediately if we have an invalid declaration. 7399 if (D.isInvalidType()) { 7400 NewTD->setInvalidDecl(); 7401 return NewTD; 7402 } 7403 7404 if (D.getDeclSpec().isModulePrivateSpecified()) { 7405 if (CurContext->isFunctionOrMethod()) 7406 Diag(NewTD->getLocation(), diag::err_module_private_local) 7407 << 2 << NewTD->getDeclName() 7408 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7409 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7410 else 7411 NewTD->setModulePrivate(); 7412 } 7413 7414 // C++ [dcl.typedef]p8: 7415 // If the typedef declaration defines an unnamed class (or 7416 // enum), the first typedef-name declared by the declaration 7417 // to be that class type (or enum type) is used to denote the 7418 // class type (or enum type) for linkage purposes only. 7419 // We need to check whether the type was declared in the declaration. 7420 switch (D.getDeclSpec().getTypeSpecType()) { 7421 case TST_enum: 7422 case TST_struct: 7423 case TST_union: 7424 case TST_class: { 7425 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7426 7427 // Do nothing if the tag is not anonymous or already has an 7428 // associated typedef (from an earlier typedef in this decl group). 7429 if (tagFromDeclSpec->getIdentifier()) break; 7430 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7431 7432 // A well-formed anonymous tag must always be a TUK_Definition. 7433 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7434 7435 // The type must match the tag exactly; no qualifiers allowed. 7436 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7437 break; 7438 7439 // Otherwise, set this is the anon-decl typedef for the tag. 7440 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7441 break; 7442 } 7443 7444 default: 7445 break; 7446 } 7447 7448 return NewTD; 7449} 7450 7451 7452/// \brief Determine whether a tag with a given kind is acceptable 7453/// as a redeclaration of the given tag declaration. 7454/// 7455/// \returns true if the new tag kind is acceptable, false otherwise. 7456bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7457 TagTypeKind NewTag, bool isDefinition, 7458 SourceLocation NewTagLoc, 7459 const IdentifierInfo &Name) { 7460 // C++ [dcl.type.elab]p3: 7461 // The class-key or enum keyword present in the 7462 // elaborated-type-specifier shall agree in kind with the 7463 // declaration to which the name in the elaborated-type-specifier 7464 // refers. This rule also applies to the form of 7465 // elaborated-type-specifier that declares a class-name or 7466 // friend class since it can be construed as referring to the 7467 // definition of the class. Thus, in any 7468 // elaborated-type-specifier, the enum keyword shall be used to 7469 // refer to an enumeration (7.2), the union class-key shall be 7470 // used to refer to a union (clause 9), and either the class or 7471 // struct class-key shall be used to refer to a class (clause 9) 7472 // declared using the class or struct class-key. 7473 TagTypeKind OldTag = Previous->getTagKind(); 7474 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7475 if (OldTag == NewTag) 7476 return true; 7477 7478 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7479 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7480 // Warn about the struct/class tag mismatch. 7481 bool isTemplate = false; 7482 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7483 isTemplate = Record->getDescribedClassTemplate(); 7484 7485 if (!ActiveTemplateInstantiations.empty()) { 7486 // In a template instantiation, do not offer fix-its for tag mismatches 7487 // since they usually mess up the template instead of fixing the problem. 7488 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7489 << (NewTag == TTK_Class) << isTemplate << &Name; 7490 return true; 7491 } 7492 7493 if (isDefinition) { 7494 // On definitions, check previous tags and issue a fix-it for each 7495 // one that doesn't match the current tag. 7496 if (Previous->getDefinition()) { 7497 // Don't suggest fix-its for redefinitions. 7498 return true; 7499 } 7500 7501 bool previousMismatch = false; 7502 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7503 E(Previous->redecls_end()); I != E; ++I) { 7504 if (I->getTagKind() != NewTag) { 7505 if (!previousMismatch) { 7506 previousMismatch = true; 7507 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7508 << (NewTag == TTK_Class) << isTemplate << &Name; 7509 } 7510 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7511 << (NewTag == TTK_Class) 7512 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7513 NewTag == TTK_Class? 7514 "class" : "struct"); 7515 } 7516 } 7517 return true; 7518 } 7519 7520 // Check for a previous definition. If current tag and definition 7521 // are same type, do nothing. If no definition, but disagree with 7522 // with previous tag type, give a warning, but no fix-it. 7523 const TagDecl *Redecl = Previous->getDefinition() ? 7524 Previous->getDefinition() : Previous; 7525 if (Redecl->getTagKind() == NewTag) { 7526 return true; 7527 } 7528 7529 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7530 << (NewTag == TTK_Class) 7531 << isTemplate << &Name; 7532 Diag(Redecl->getLocation(), diag::note_previous_use); 7533 7534 // If there is a previous defintion, suggest a fix-it. 7535 if (Previous->getDefinition()) { 7536 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7537 << (Redecl->getTagKind() == TTK_Class) 7538 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7539 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7540 } 7541 7542 return true; 7543 } 7544 return false; 7545} 7546 7547/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7548/// former case, Name will be non-null. In the later case, Name will be null. 7549/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7550/// reference/declaration/definition of a tag. 7551Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7552 SourceLocation KWLoc, CXXScopeSpec &SS, 7553 IdentifierInfo *Name, SourceLocation NameLoc, 7554 AttributeList *Attr, AccessSpecifier AS, 7555 SourceLocation ModulePrivateLoc, 7556 MultiTemplateParamsArg TemplateParameterLists, 7557 bool &OwnedDecl, bool &IsDependent, 7558 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7559 TypeResult UnderlyingType) { 7560 // If this is not a definition, it must have a name. 7561 assert((Name != 0 || TUK == TUK_Definition) && 7562 "Nameless record must be a definition!"); 7563 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7564 7565 OwnedDecl = false; 7566 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7567 7568 // FIXME: Check explicit specializations more carefully. 7569 bool isExplicitSpecialization = false; 7570 bool Invalid = false; 7571 7572 // We only need to do this matching if we have template parameters 7573 // or a scope specifier, which also conveniently avoids this work 7574 // for non-C++ cases. 7575 if (TemplateParameterLists.size() > 0 || 7576 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7577 if (TemplateParameterList *TemplateParams 7578 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7579 TemplateParameterLists.get(), 7580 TemplateParameterLists.size(), 7581 TUK == TUK_Friend, 7582 isExplicitSpecialization, 7583 Invalid)) { 7584 if (TemplateParams->size() > 0) { 7585 // This is a declaration or definition of a class template (which may 7586 // be a member of another template). 7587 7588 if (Invalid) 7589 return 0; 7590 7591 OwnedDecl = false; 7592 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7593 SS, Name, NameLoc, Attr, 7594 TemplateParams, AS, 7595 ModulePrivateLoc, 7596 TemplateParameterLists.size() - 1, 7597 (TemplateParameterList**) TemplateParameterLists.release()); 7598 return Result.get(); 7599 } else { 7600 // The "template<>" header is extraneous. 7601 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7602 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7603 isExplicitSpecialization = true; 7604 } 7605 } 7606 } 7607 7608 // Figure out the underlying type if this a enum declaration. We need to do 7609 // this early, because it's needed to detect if this is an incompatible 7610 // redeclaration. 7611 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7612 7613 if (Kind == TTK_Enum) { 7614 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7615 // No underlying type explicitly specified, or we failed to parse the 7616 // type, default to int. 7617 EnumUnderlying = Context.IntTy.getTypePtr(); 7618 else if (UnderlyingType.get()) { 7619 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7620 // integral type; any cv-qualification is ignored. 7621 TypeSourceInfo *TI = 0; 7622 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7623 EnumUnderlying = TI; 7624 7625 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7626 7627 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7628 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7629 << T; 7630 // Recover by falling back to int. 7631 EnumUnderlying = Context.IntTy.getTypePtr(); 7632 } 7633 7634 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7635 UPPC_FixedUnderlyingType)) 7636 EnumUnderlying = Context.IntTy.getTypePtr(); 7637 7638 } else if (getLangOptions().MicrosoftExt) 7639 // Microsoft enums are always of int type. 7640 EnumUnderlying = Context.IntTy.getTypePtr(); 7641 } 7642 7643 DeclContext *SearchDC = CurContext; 7644 DeclContext *DC = CurContext; 7645 bool isStdBadAlloc = false; 7646 7647 RedeclarationKind Redecl = ForRedeclaration; 7648 if (TUK == TUK_Friend || TUK == TUK_Reference) 7649 Redecl = NotForRedeclaration; 7650 7651 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7652 7653 if (Name && SS.isNotEmpty()) { 7654 // We have a nested-name tag ('struct foo::bar'). 7655 7656 // Check for invalid 'foo::'. 7657 if (SS.isInvalid()) { 7658 Name = 0; 7659 goto CreateNewDecl; 7660 } 7661 7662 // If this is a friend or a reference to a class in a dependent 7663 // context, don't try to make a decl for it. 7664 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7665 DC = computeDeclContext(SS, false); 7666 if (!DC) { 7667 IsDependent = true; 7668 return 0; 7669 } 7670 } else { 7671 DC = computeDeclContext(SS, true); 7672 if (!DC) { 7673 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7674 << SS.getRange(); 7675 return 0; 7676 } 7677 } 7678 7679 if (RequireCompleteDeclContext(SS, DC)) 7680 return 0; 7681 7682 SearchDC = DC; 7683 // Look-up name inside 'foo::'. 7684 LookupQualifiedName(Previous, DC); 7685 7686 if (Previous.isAmbiguous()) 7687 return 0; 7688 7689 if (Previous.empty()) { 7690 // Name lookup did not find anything. However, if the 7691 // nested-name-specifier refers to the current instantiation, 7692 // and that current instantiation has any dependent base 7693 // classes, we might find something at instantiation time: treat 7694 // this as a dependent elaborated-type-specifier. 7695 // But this only makes any sense for reference-like lookups. 7696 if (Previous.wasNotFoundInCurrentInstantiation() && 7697 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7698 IsDependent = true; 7699 return 0; 7700 } 7701 7702 // A tag 'foo::bar' must already exist. 7703 Diag(NameLoc, diag::err_not_tag_in_scope) 7704 << Kind << Name << DC << SS.getRange(); 7705 Name = 0; 7706 Invalid = true; 7707 goto CreateNewDecl; 7708 } 7709 } else if (Name) { 7710 // If this is a named struct, check to see if there was a previous forward 7711 // declaration or definition. 7712 // FIXME: We're looking into outer scopes here, even when we 7713 // shouldn't be. Doing so can result in ambiguities that we 7714 // shouldn't be diagnosing. 7715 LookupName(Previous, S); 7716 7717 if (Previous.isAmbiguous() && 7718 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7719 LookupResult::Filter F = Previous.makeFilter(); 7720 while (F.hasNext()) { 7721 NamedDecl *ND = F.next(); 7722 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7723 F.erase(); 7724 } 7725 F.done(); 7726 } 7727 7728 // Note: there used to be some attempt at recovery here. 7729 if (Previous.isAmbiguous()) 7730 return 0; 7731 7732 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7733 // FIXME: This makes sure that we ignore the contexts associated 7734 // with C structs, unions, and enums when looking for a matching 7735 // tag declaration or definition. See the similar lookup tweak 7736 // in Sema::LookupName; is there a better way to deal with this? 7737 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7738 SearchDC = SearchDC->getParent(); 7739 } 7740 } else if (S->isFunctionPrototypeScope()) { 7741 // If this is an enum declaration in function prototype scope, set its 7742 // initial context to the translation unit. 7743 SearchDC = Context.getTranslationUnitDecl(); 7744 } 7745 7746 if (Previous.isSingleResult() && 7747 Previous.getFoundDecl()->isTemplateParameter()) { 7748 // Maybe we will complain about the shadowed template parameter. 7749 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7750 // Just pretend that we didn't see the previous declaration. 7751 Previous.clear(); 7752 } 7753 7754 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7755 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7756 // This is a declaration of or a reference to "std::bad_alloc". 7757 isStdBadAlloc = true; 7758 7759 if (Previous.empty() && StdBadAlloc) { 7760 // std::bad_alloc has been implicitly declared (but made invisible to 7761 // name lookup). Fill in this implicit declaration as the previous 7762 // declaration, so that the declarations get chained appropriately. 7763 Previous.addDecl(getStdBadAlloc()); 7764 } 7765 } 7766 7767 // If we didn't find a previous declaration, and this is a reference 7768 // (or friend reference), move to the correct scope. In C++, we 7769 // also need to do a redeclaration lookup there, just in case 7770 // there's a shadow friend decl. 7771 if (Name && Previous.empty() && 7772 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7773 if (Invalid) goto CreateNewDecl; 7774 assert(SS.isEmpty()); 7775 7776 if (TUK == TUK_Reference) { 7777 // C++ [basic.scope.pdecl]p5: 7778 // -- for an elaborated-type-specifier of the form 7779 // 7780 // class-key identifier 7781 // 7782 // if the elaborated-type-specifier is used in the 7783 // decl-specifier-seq or parameter-declaration-clause of a 7784 // function defined in namespace scope, the identifier is 7785 // declared as a class-name in the namespace that contains 7786 // the declaration; otherwise, except as a friend 7787 // declaration, the identifier is declared in the smallest 7788 // non-class, non-function-prototype scope that contains the 7789 // declaration. 7790 // 7791 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7792 // C structs and unions. 7793 // 7794 // It is an error in C++ to declare (rather than define) an enum 7795 // type, including via an elaborated type specifier. We'll 7796 // diagnose that later; for now, declare the enum in the same 7797 // scope as we would have picked for any other tag type. 7798 // 7799 // GNU C also supports this behavior as part of its incomplete 7800 // enum types extension, while GNU C++ does not. 7801 // 7802 // Find the context where we'll be declaring the tag. 7803 // FIXME: We would like to maintain the current DeclContext as the 7804 // lexical context, 7805 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7806 SearchDC = SearchDC->getParent(); 7807 7808 // Find the scope where we'll be declaring the tag. 7809 while (S->isClassScope() || 7810 (getLangOptions().CPlusPlus && 7811 S->isFunctionPrototypeScope()) || 7812 ((S->getFlags() & Scope::DeclScope) == 0) || 7813 (S->getEntity() && 7814 ((DeclContext *)S->getEntity())->isTransparentContext())) 7815 S = S->getParent(); 7816 } else { 7817 assert(TUK == TUK_Friend); 7818 // C++ [namespace.memdef]p3: 7819 // If a friend declaration in a non-local class first declares a 7820 // class or function, the friend class or function is a member of 7821 // the innermost enclosing namespace. 7822 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7823 } 7824 7825 // In C++, we need to do a redeclaration lookup to properly 7826 // diagnose some problems. 7827 if (getLangOptions().CPlusPlus) { 7828 Previous.setRedeclarationKind(ForRedeclaration); 7829 LookupQualifiedName(Previous, SearchDC); 7830 } 7831 } 7832 7833 if (!Previous.empty()) { 7834 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7835 7836 // It's okay to have a tag decl in the same scope as a typedef 7837 // which hides a tag decl in the same scope. Finding this 7838 // insanity with a redeclaration lookup can only actually happen 7839 // in C++. 7840 // 7841 // This is also okay for elaborated-type-specifiers, which is 7842 // technically forbidden by the current standard but which is 7843 // okay according to the likely resolution of an open issue; 7844 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7845 if (getLangOptions().CPlusPlus) { 7846 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7847 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7848 TagDecl *Tag = TT->getDecl(); 7849 if (Tag->getDeclName() == Name && 7850 Tag->getDeclContext()->getRedeclContext() 7851 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7852 PrevDecl = Tag; 7853 Previous.clear(); 7854 Previous.addDecl(Tag); 7855 Previous.resolveKind(); 7856 } 7857 } 7858 } 7859 } 7860 7861 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7862 // If this is a use of a previous tag, or if the tag is already declared 7863 // in the same scope (so that the definition/declaration completes or 7864 // rementions the tag), reuse the decl. 7865 if (TUK == TUK_Reference || TUK == TUK_Friend || 7866 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7867 // Make sure that this wasn't declared as an enum and now used as a 7868 // struct or something similar. 7869 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7870 TUK == TUK_Definition, KWLoc, 7871 *Name)) { 7872 bool SafeToContinue 7873 = (PrevTagDecl->getTagKind() != TTK_Enum && 7874 Kind != TTK_Enum); 7875 if (SafeToContinue) 7876 Diag(KWLoc, diag::err_use_with_wrong_tag) 7877 << Name 7878 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7879 PrevTagDecl->getKindName()); 7880 else 7881 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7882 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7883 7884 if (SafeToContinue) 7885 Kind = PrevTagDecl->getTagKind(); 7886 else { 7887 // Recover by making this an anonymous redefinition. 7888 Name = 0; 7889 Previous.clear(); 7890 Invalid = true; 7891 } 7892 } 7893 7894 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7895 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7896 7897 // All conflicts with previous declarations are recovered by 7898 // returning the previous declaration. 7899 if (ScopedEnum != PrevEnum->isScoped()) { 7900 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7901 << PrevEnum->isScoped(); 7902 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7903 return PrevTagDecl; 7904 } 7905 else if (EnumUnderlying && PrevEnum->isFixed()) { 7906 QualType T; 7907 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7908 T = TI->getType(); 7909 else 7910 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7911 7912 if (!Context.hasSameUnqualifiedType(T, 7913 PrevEnum->getIntegerType())) { 7914 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7915 diag::err_enum_redeclare_type_mismatch) 7916 << T 7917 << PrevEnum->getIntegerType(); 7918 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7919 return PrevTagDecl; 7920 } 7921 } 7922 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7923 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7924 << PrevEnum->isFixed(); 7925 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7926 return PrevTagDecl; 7927 } 7928 } 7929 7930 if (!Invalid) { 7931 // If this is a use, just return the declaration we found. 7932 7933 // FIXME: In the future, return a variant or some other clue 7934 // for the consumer of this Decl to know it doesn't own it. 7935 // For our current ASTs this shouldn't be a problem, but will 7936 // need to be changed with DeclGroups. 7937 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7938 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7939 return PrevTagDecl; 7940 7941 // Diagnose attempts to redefine a tag. 7942 if (TUK == TUK_Definition) { 7943 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7944 // If we're defining a specialization and the previous definition 7945 // is from an implicit instantiation, don't emit an error 7946 // here; we'll catch this in the general case below. 7947 if (!isExplicitSpecialization || 7948 !isa<CXXRecordDecl>(Def) || 7949 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7950 == TSK_ExplicitSpecialization) { 7951 Diag(NameLoc, diag::err_redefinition) << Name; 7952 Diag(Def->getLocation(), diag::note_previous_definition); 7953 // If this is a redefinition, recover by making this 7954 // struct be anonymous, which will make any later 7955 // references get the previous definition. 7956 Name = 0; 7957 Previous.clear(); 7958 Invalid = true; 7959 } 7960 } else { 7961 // If the type is currently being defined, complain 7962 // about a nested redefinition. 7963 const TagType *Tag 7964 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7965 if (Tag->isBeingDefined()) { 7966 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7967 Diag(PrevTagDecl->getLocation(), 7968 diag::note_previous_definition); 7969 Name = 0; 7970 Previous.clear(); 7971 Invalid = true; 7972 } 7973 } 7974 7975 // Okay, this is definition of a previously declared or referenced 7976 // tag PrevDecl. We're going to create a new Decl for it. 7977 } 7978 } 7979 // If we get here we have (another) forward declaration or we 7980 // have a definition. Just create a new decl. 7981 7982 } else { 7983 // If we get here, this is a definition of a new tag type in a nested 7984 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7985 // new decl/type. We set PrevDecl to NULL so that the entities 7986 // have distinct types. 7987 Previous.clear(); 7988 } 7989 // If we get here, we're going to create a new Decl. If PrevDecl 7990 // is non-NULL, it's a definition of the tag declared by 7991 // PrevDecl. If it's NULL, we have a new definition. 7992 7993 7994 // Otherwise, PrevDecl is not a tag, but was found with tag 7995 // lookup. This is only actually possible in C++, where a few 7996 // things like templates still live in the tag namespace. 7997 } else { 7998 assert(getLangOptions().CPlusPlus); 7999 8000 // Use a better diagnostic if an elaborated-type-specifier 8001 // found the wrong kind of type on the first 8002 // (non-redeclaration) lookup. 8003 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8004 !Previous.isForRedeclaration()) { 8005 unsigned Kind = 0; 8006 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8007 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8008 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8009 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8010 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8011 Invalid = true; 8012 8013 // Otherwise, only diagnose if the declaration is in scope. 8014 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8015 isExplicitSpecialization)) { 8016 // do nothing 8017 8018 // Diagnose implicit declarations introduced by elaborated types. 8019 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8020 unsigned Kind = 0; 8021 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8022 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8023 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8024 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8025 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8026 Invalid = true; 8027 8028 // Otherwise it's a declaration. Call out a particularly common 8029 // case here. 8030 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8031 unsigned Kind = 0; 8032 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8033 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8034 << Name << Kind << TND->getUnderlyingType(); 8035 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8036 Invalid = true; 8037 8038 // Otherwise, diagnose. 8039 } else { 8040 // The tag name clashes with something else in the target scope, 8041 // issue an error and recover by making this tag be anonymous. 8042 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8043 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8044 Name = 0; 8045 Invalid = true; 8046 } 8047 8048 // The existing declaration isn't relevant to us; we're in a 8049 // new scope, so clear out the previous declaration. 8050 Previous.clear(); 8051 } 8052 } 8053 8054CreateNewDecl: 8055 8056 TagDecl *PrevDecl = 0; 8057 if (Previous.isSingleResult()) 8058 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8059 8060 // If there is an identifier, use the location of the identifier as the 8061 // location of the decl, otherwise use the location of the struct/union 8062 // keyword. 8063 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8064 8065 // Otherwise, create a new declaration. If there is a previous 8066 // declaration of the same entity, the two will be linked via 8067 // PrevDecl. 8068 TagDecl *New; 8069 8070 bool IsForwardReference = false; 8071 if (Kind == TTK_Enum) { 8072 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8073 // enum X { A, B, C } D; D should chain to X. 8074 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8075 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8076 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8077 // If this is an undefined enum, warn. 8078 if (TUK != TUK_Definition && !Invalid) { 8079 TagDecl *Def; 8080 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8081 // C++0x: 7.2p2: opaque-enum-declaration. 8082 // Conflicts are diagnosed above. Do nothing. 8083 } 8084 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8085 Diag(Loc, diag::ext_forward_ref_enum_def) 8086 << New; 8087 Diag(Def->getLocation(), diag::note_previous_definition); 8088 } else { 8089 unsigned DiagID = diag::ext_forward_ref_enum; 8090 if (getLangOptions().MicrosoftExt) 8091 DiagID = diag::ext_ms_forward_ref_enum; 8092 else if (getLangOptions().CPlusPlus) 8093 DiagID = diag::err_forward_ref_enum; 8094 Diag(Loc, DiagID); 8095 8096 // If this is a forward-declared reference to an enumeration, make a 8097 // note of it; we won't actually be introducing the declaration into 8098 // the declaration context. 8099 if (TUK == TUK_Reference) 8100 IsForwardReference = true; 8101 } 8102 } 8103 8104 if (EnumUnderlying) { 8105 EnumDecl *ED = cast<EnumDecl>(New); 8106 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8107 ED->setIntegerTypeSourceInfo(TI); 8108 else 8109 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8110 ED->setPromotionType(ED->getIntegerType()); 8111 } 8112 8113 } else { 8114 // struct/union/class 8115 8116 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8117 // struct X { int A; } D; D should chain to X. 8118 if (getLangOptions().CPlusPlus) { 8119 // FIXME: Look for a way to use RecordDecl for simple structs. 8120 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8121 cast_or_null<CXXRecordDecl>(PrevDecl)); 8122 8123 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8124 StdBadAlloc = cast<CXXRecordDecl>(New); 8125 } else 8126 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8127 cast_or_null<RecordDecl>(PrevDecl)); 8128 } 8129 8130 // Maybe add qualifier info. 8131 if (SS.isNotEmpty()) { 8132 if (SS.isSet()) { 8133 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8134 if (TemplateParameterLists.size() > 0) { 8135 New->setTemplateParameterListsInfo(Context, 8136 TemplateParameterLists.size(), 8137 (TemplateParameterList**) TemplateParameterLists.release()); 8138 } 8139 } 8140 else 8141 Invalid = true; 8142 } 8143 8144 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8145 // Add alignment attributes if necessary; these attributes are checked when 8146 // the ASTContext lays out the structure. 8147 // 8148 // It is important for implementing the correct semantics that this 8149 // happen here (in act on tag decl). The #pragma pack stack is 8150 // maintained as a result of parser callbacks which can occur at 8151 // many points during the parsing of a struct declaration (because 8152 // the #pragma tokens are effectively skipped over during the 8153 // parsing of the struct). 8154 AddAlignmentAttributesForRecord(RD); 8155 8156 AddMsStructLayoutForRecord(RD); 8157 } 8158 8159 if (PrevDecl && PrevDecl->isModulePrivate()) 8160 New->setModulePrivate(); 8161 else if (ModulePrivateLoc.isValid()) { 8162 if (isExplicitSpecialization) 8163 Diag(New->getLocation(), diag::err_module_private_specialization) 8164 << 2 8165 << FixItHint::CreateRemoval(ModulePrivateLoc); 8166 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8167 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8168 // __module_private__ does not apply to local classes. However, we only 8169 // diagnose this as an error when the declaration specifiers are 8170 // freestanding. Here, we just ignore the __module_private__. 8171 // foobar 8172 else if (!SearchDC->isFunctionOrMethod()) 8173 New->setModulePrivate(); 8174 } 8175 8176 // If this is a specialization of a member class (of a class template), 8177 // check the specialization. 8178 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8179 Invalid = true; 8180 8181 if (Invalid) 8182 New->setInvalidDecl(); 8183 8184 if (Attr) 8185 ProcessDeclAttributeList(S, New, Attr); 8186 8187 // If we're declaring or defining a tag in function prototype scope 8188 // in C, note that this type can only be used within the function. 8189 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8190 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8191 8192 // Set the lexical context. If the tag has a C++ scope specifier, the 8193 // lexical context will be different from the semantic context. 8194 New->setLexicalDeclContext(CurContext); 8195 8196 // Mark this as a friend decl if applicable. 8197 // In Microsoft mode, a friend declaration also acts as a forward 8198 // declaration so we always pass true to setObjectOfFriendDecl to make 8199 // the tag name visible. 8200 if (TUK == TUK_Friend) 8201 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8202 getLangOptions().MicrosoftExt); 8203 8204 // Set the access specifier. 8205 if (!Invalid && SearchDC->isRecord()) 8206 SetMemberAccessSpecifier(New, PrevDecl, AS); 8207 8208 if (TUK == TUK_Definition) 8209 New->startDefinition(); 8210 8211 // If this has an identifier, add it to the scope stack. 8212 if (TUK == TUK_Friend) { 8213 // We might be replacing an existing declaration in the lookup tables; 8214 // if so, borrow its access specifier. 8215 if (PrevDecl) 8216 New->setAccess(PrevDecl->getAccess()); 8217 8218 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8219 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8220 if (Name) // can be null along some error paths 8221 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8222 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8223 } else if (Name) { 8224 S = getNonFieldDeclScope(S); 8225 PushOnScopeChains(New, S, !IsForwardReference); 8226 if (IsForwardReference) 8227 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8228 8229 } else { 8230 CurContext->addDecl(New); 8231 } 8232 8233 // If this is the C FILE type, notify the AST context. 8234 if (IdentifierInfo *II = New->getIdentifier()) 8235 if (!New->isInvalidDecl() && 8236 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8237 II->isStr("FILE")) 8238 Context.setFILEDecl(New); 8239 8240 OwnedDecl = true; 8241 return New; 8242} 8243 8244void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8245 AdjustDeclIfTemplate(TagD); 8246 TagDecl *Tag = cast<TagDecl>(TagD); 8247 8248 // Enter the tag context. 8249 PushDeclContext(S, Tag); 8250} 8251 8252Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8253 assert(isa<ObjCContainerDecl>(IDecl) && 8254 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8255 DeclContext *OCD = cast<DeclContext>(IDecl); 8256 assert(getContainingDC(OCD) == CurContext && 8257 "The next DeclContext should be lexically contained in the current one."); 8258 CurContext = OCD; 8259 return IDecl; 8260} 8261 8262void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8263 SourceLocation FinalLoc, 8264 SourceLocation LBraceLoc) { 8265 AdjustDeclIfTemplate(TagD); 8266 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8267 8268 FieldCollector->StartClass(); 8269 8270 if (!Record->getIdentifier()) 8271 return; 8272 8273 if (FinalLoc.isValid()) 8274 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8275 8276 // C++ [class]p2: 8277 // [...] The class-name is also inserted into the scope of the 8278 // class itself; this is known as the injected-class-name. For 8279 // purposes of access checking, the injected-class-name is treated 8280 // as if it were a public member name. 8281 CXXRecordDecl *InjectedClassName 8282 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8283 Record->getLocStart(), Record->getLocation(), 8284 Record->getIdentifier(), 8285 /*PrevDecl=*/0, 8286 /*DelayTypeCreation=*/true); 8287 Context.getTypeDeclType(InjectedClassName, Record); 8288 InjectedClassName->setImplicit(); 8289 InjectedClassName->setAccess(AS_public); 8290 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8291 InjectedClassName->setDescribedClassTemplate(Template); 8292 PushOnScopeChains(InjectedClassName, S); 8293 assert(InjectedClassName->isInjectedClassName() && 8294 "Broken injected-class-name"); 8295} 8296 8297void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8298 SourceLocation RBraceLoc) { 8299 AdjustDeclIfTemplate(TagD); 8300 TagDecl *Tag = cast<TagDecl>(TagD); 8301 Tag->setRBraceLoc(RBraceLoc); 8302 8303 if (isa<CXXRecordDecl>(Tag)) 8304 FieldCollector->FinishClass(); 8305 8306 // Exit this scope of this tag's definition. 8307 PopDeclContext(); 8308 8309 // Notify the consumer that we've defined a tag. 8310 Consumer.HandleTagDeclDefinition(Tag); 8311} 8312 8313void Sema::ActOnObjCContainerFinishDefinition() { 8314 // Exit this scope of this interface definition. 8315 PopDeclContext(); 8316} 8317 8318void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8319 assert(DC == CurContext && "Mismatch of container contexts"); 8320 OriginalLexicalContext = DC; 8321 ActOnObjCContainerFinishDefinition(); 8322} 8323 8324void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8325 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8326 OriginalLexicalContext = 0; 8327} 8328 8329void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8330 AdjustDeclIfTemplate(TagD); 8331 TagDecl *Tag = cast<TagDecl>(TagD); 8332 Tag->setInvalidDecl(); 8333 8334 // We're undoing ActOnTagStartDefinition here, not 8335 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8336 // the FieldCollector. 8337 8338 PopDeclContext(); 8339} 8340 8341// Note that FieldName may be null for anonymous bitfields. 8342bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8343 QualType FieldTy, const Expr *BitWidth, 8344 bool *ZeroWidth) { 8345 // Default to true; that shouldn't confuse checks for emptiness 8346 if (ZeroWidth) 8347 *ZeroWidth = true; 8348 8349 // C99 6.7.2.1p4 - verify the field type. 8350 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8351 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8352 // Handle incomplete types with specific error. 8353 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8354 return true; 8355 if (FieldName) 8356 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8357 << FieldName << FieldTy << BitWidth->getSourceRange(); 8358 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8359 << FieldTy << BitWidth->getSourceRange(); 8360 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8361 UPPC_BitFieldWidth)) 8362 return true; 8363 8364 // If the bit-width is type- or value-dependent, don't try to check 8365 // it now. 8366 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8367 return false; 8368 8369 llvm::APSInt Value; 8370 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8371 return true; 8372 8373 if (Value != 0 && ZeroWidth) 8374 *ZeroWidth = false; 8375 8376 // Zero-width bitfield is ok for anonymous field. 8377 if (Value == 0 && FieldName) 8378 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8379 8380 if (Value.isSigned() && Value.isNegative()) { 8381 if (FieldName) 8382 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8383 << FieldName << Value.toString(10); 8384 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8385 << Value.toString(10); 8386 } 8387 8388 if (!FieldTy->isDependentType()) { 8389 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8390 if (Value.getZExtValue() > TypeSize) { 8391 if (!getLangOptions().CPlusPlus) { 8392 if (FieldName) 8393 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8394 << FieldName << (unsigned)Value.getZExtValue() 8395 << (unsigned)TypeSize; 8396 8397 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8398 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8399 } 8400 8401 if (FieldName) 8402 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8403 << FieldName << (unsigned)Value.getZExtValue() 8404 << (unsigned)TypeSize; 8405 else 8406 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8407 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8408 } 8409 } 8410 8411 return false; 8412} 8413 8414/// ActOnField - Each field of a C struct/union is passed into this in order 8415/// to create a FieldDecl object for it. 8416Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8417 Declarator &D, Expr *BitfieldWidth) { 8418 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8419 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8420 /*HasInit=*/false, AS_public); 8421 return Res; 8422} 8423 8424/// HandleField - Analyze a field of a C struct or a C++ data member. 8425/// 8426FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8427 SourceLocation DeclStart, 8428 Declarator &D, Expr *BitWidth, bool HasInit, 8429 AccessSpecifier AS) { 8430 IdentifierInfo *II = D.getIdentifier(); 8431 SourceLocation Loc = DeclStart; 8432 if (II) Loc = D.getIdentifierLoc(); 8433 8434 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8435 QualType T = TInfo->getType(); 8436 if (getLangOptions().CPlusPlus) { 8437 CheckExtraCXXDefaultArguments(D); 8438 8439 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8440 UPPC_DataMemberType)) { 8441 D.setInvalidType(); 8442 T = Context.IntTy; 8443 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8444 } 8445 } 8446 8447 DiagnoseFunctionSpecifiers(D); 8448 8449 if (D.getDeclSpec().isThreadSpecified()) 8450 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8451 if (D.getDeclSpec().isConstexprSpecified()) 8452 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8453 << 2; 8454 8455 // Check to see if this name was declared as a member previously 8456 NamedDecl *PrevDecl = 0; 8457 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8458 LookupName(Previous, S); 8459 switch (Previous.getResultKind()) { 8460 case LookupResult::Found: 8461 case LookupResult::FoundUnresolvedValue: 8462 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8463 break; 8464 8465 case LookupResult::FoundOverloaded: 8466 PrevDecl = Previous.getRepresentativeDecl(); 8467 break; 8468 8469 case LookupResult::NotFound: 8470 case LookupResult::NotFoundInCurrentInstantiation: 8471 case LookupResult::Ambiguous: 8472 break; 8473 } 8474 Previous.suppressDiagnostics(); 8475 8476 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8477 // Maybe we will complain about the shadowed template parameter. 8478 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8479 // Just pretend that we didn't see the previous declaration. 8480 PrevDecl = 0; 8481 } 8482 8483 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8484 PrevDecl = 0; 8485 8486 bool Mutable 8487 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8488 SourceLocation TSSL = D.getSourceRange().getBegin(); 8489 FieldDecl *NewFD 8490 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8491 TSSL, AS, PrevDecl, &D); 8492 8493 if (NewFD->isInvalidDecl()) 8494 Record->setInvalidDecl(); 8495 8496 if (D.getDeclSpec().isModulePrivateSpecified()) 8497 NewFD->setModulePrivate(); 8498 8499 if (NewFD->isInvalidDecl() && PrevDecl) { 8500 // Don't introduce NewFD into scope; there's already something 8501 // with the same name in the same scope. 8502 } else if (II) { 8503 PushOnScopeChains(NewFD, S); 8504 } else 8505 Record->addDecl(NewFD); 8506 8507 return NewFD; 8508} 8509 8510/// \brief Build a new FieldDecl and check its well-formedness. 8511/// 8512/// This routine builds a new FieldDecl given the fields name, type, 8513/// record, etc. \p PrevDecl should refer to any previous declaration 8514/// with the same name and in the same scope as the field to be 8515/// created. 8516/// 8517/// \returns a new FieldDecl. 8518/// 8519/// \todo The Declarator argument is a hack. It will be removed once 8520FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8521 TypeSourceInfo *TInfo, 8522 RecordDecl *Record, SourceLocation Loc, 8523 bool Mutable, Expr *BitWidth, bool HasInit, 8524 SourceLocation TSSL, 8525 AccessSpecifier AS, NamedDecl *PrevDecl, 8526 Declarator *D) { 8527 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8528 bool InvalidDecl = false; 8529 if (D) InvalidDecl = D->isInvalidType(); 8530 8531 // If we receive a broken type, recover by assuming 'int' and 8532 // marking this declaration as invalid. 8533 if (T.isNull()) { 8534 InvalidDecl = true; 8535 T = Context.IntTy; 8536 } 8537 8538 QualType EltTy = Context.getBaseElementType(T); 8539 if (!EltTy->isDependentType() && 8540 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8541 // Fields of incomplete type force their record to be invalid. 8542 Record->setInvalidDecl(); 8543 InvalidDecl = true; 8544 } 8545 8546 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8547 // than a variably modified type. 8548 if (!InvalidDecl && T->isVariablyModifiedType()) { 8549 bool SizeIsNegative; 8550 llvm::APSInt Oversized; 8551 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8552 SizeIsNegative, 8553 Oversized); 8554 if (!FixedTy.isNull()) { 8555 Diag(Loc, diag::warn_illegal_constant_array_size); 8556 T = FixedTy; 8557 } else { 8558 if (SizeIsNegative) 8559 Diag(Loc, diag::err_typecheck_negative_array_size); 8560 else if (Oversized.getBoolValue()) 8561 Diag(Loc, diag::err_array_too_large) 8562 << Oversized.toString(10); 8563 else 8564 Diag(Loc, diag::err_typecheck_field_variable_size); 8565 InvalidDecl = true; 8566 } 8567 } 8568 8569 // Fields can not have abstract class types 8570 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8571 diag::err_abstract_type_in_decl, 8572 AbstractFieldType)) 8573 InvalidDecl = true; 8574 8575 bool ZeroWidth = false; 8576 // If this is declared as a bit-field, check the bit-field. 8577 if (!InvalidDecl && BitWidth && 8578 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8579 InvalidDecl = true; 8580 BitWidth = 0; 8581 ZeroWidth = false; 8582 } 8583 8584 // Check that 'mutable' is consistent with the type of the declaration. 8585 if (!InvalidDecl && Mutable) { 8586 unsigned DiagID = 0; 8587 if (T->isReferenceType()) 8588 DiagID = diag::err_mutable_reference; 8589 else if (T.isConstQualified()) 8590 DiagID = diag::err_mutable_const; 8591 8592 if (DiagID) { 8593 SourceLocation ErrLoc = Loc; 8594 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8595 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8596 Diag(ErrLoc, DiagID); 8597 Mutable = false; 8598 InvalidDecl = true; 8599 } 8600 } 8601 8602 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8603 BitWidth, Mutable, HasInit); 8604 if (InvalidDecl) 8605 NewFD->setInvalidDecl(); 8606 8607 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8608 Diag(Loc, diag::err_duplicate_member) << II; 8609 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8610 NewFD->setInvalidDecl(); 8611 } 8612 8613 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8614 if (Record->isUnion()) { 8615 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8616 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8617 if (RDecl->getDefinition()) { 8618 // C++ [class.union]p1: An object of a class with a non-trivial 8619 // constructor, a non-trivial copy constructor, a non-trivial 8620 // destructor, or a non-trivial copy assignment operator 8621 // cannot be a member of a union, nor can an array of such 8622 // objects. 8623 if (CheckNontrivialField(NewFD)) 8624 NewFD->setInvalidDecl(); 8625 } 8626 } 8627 8628 // C++ [class.union]p1: If a union contains a member of reference type, 8629 // the program is ill-formed. 8630 if (EltTy->isReferenceType()) { 8631 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8632 << NewFD->getDeclName() << EltTy; 8633 NewFD->setInvalidDecl(); 8634 } 8635 } 8636 } 8637 8638 // FIXME: We need to pass in the attributes given an AST 8639 // representation, not a parser representation. 8640 if (D) 8641 // FIXME: What to pass instead of TUScope? 8642 ProcessDeclAttributes(TUScope, NewFD, *D); 8643 8644 // In auto-retain/release, infer strong retension for fields of 8645 // retainable type. 8646 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8647 NewFD->setInvalidDecl(); 8648 8649 if (T.isObjCGCWeak()) 8650 Diag(Loc, diag::warn_attribute_weak_on_field); 8651 8652 NewFD->setAccess(AS); 8653 return NewFD; 8654} 8655 8656bool Sema::CheckNontrivialField(FieldDecl *FD) { 8657 assert(FD); 8658 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8659 8660 if (FD->isInvalidDecl()) 8661 return true; 8662 8663 QualType EltTy = Context.getBaseElementType(FD->getType()); 8664 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8665 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8666 if (RDecl->getDefinition()) { 8667 // We check for copy constructors before constructors 8668 // because otherwise we'll never get complaints about 8669 // copy constructors. 8670 8671 CXXSpecialMember member = CXXInvalid; 8672 if (!RDecl->hasTrivialCopyConstructor()) 8673 member = CXXCopyConstructor; 8674 else if (!RDecl->hasTrivialDefaultConstructor()) 8675 member = CXXDefaultConstructor; 8676 else if (!RDecl->hasTrivialCopyAssignment()) 8677 member = CXXCopyAssignment; 8678 else if (!RDecl->hasTrivialDestructor()) 8679 member = CXXDestructor; 8680 8681 if (member != CXXInvalid) { 8682 if (!getLangOptions().CPlusPlus0x && 8683 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8684 // Objective-C++ ARC: it is an error to have a non-trivial field of 8685 // a union. However, system headers in Objective-C programs 8686 // occasionally have Objective-C lifetime objects within unions, 8687 // and rather than cause the program to fail, we make those 8688 // members unavailable. 8689 SourceLocation Loc = FD->getLocation(); 8690 if (getSourceManager().isInSystemHeader(Loc)) { 8691 if (!FD->hasAttr<UnavailableAttr>()) 8692 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8693 "this system field has retaining ownership")); 8694 return false; 8695 } 8696 } 8697 8698 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8699 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8700 diag::err_illegal_union_or_anon_struct_member) 8701 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8702 DiagnoseNontrivial(RT, member); 8703 return !getLangOptions().CPlusPlus0x; 8704 } 8705 } 8706 } 8707 8708 return false; 8709} 8710 8711/// DiagnoseNontrivial - Given that a class has a non-trivial 8712/// special member, figure out why. 8713void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8714 QualType QT(T, 0U); 8715 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8716 8717 // Check whether the member was user-declared. 8718 switch (member) { 8719 case CXXInvalid: 8720 break; 8721 8722 case CXXDefaultConstructor: 8723 if (RD->hasUserDeclaredConstructor()) { 8724 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8725 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8726 const FunctionDecl *body = 0; 8727 ci->hasBody(body); 8728 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8729 SourceLocation CtorLoc = ci->getLocation(); 8730 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8731 return; 8732 } 8733 } 8734 8735 llvm_unreachable("found no user-declared constructors"); 8736 } 8737 break; 8738 8739 case CXXCopyConstructor: 8740 if (RD->hasUserDeclaredCopyConstructor()) { 8741 SourceLocation CtorLoc = 8742 RD->getCopyConstructor(0)->getLocation(); 8743 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8744 return; 8745 } 8746 break; 8747 8748 case CXXMoveConstructor: 8749 if (RD->hasUserDeclaredMoveConstructor()) { 8750 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8751 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8752 return; 8753 } 8754 break; 8755 8756 case CXXCopyAssignment: 8757 if (RD->hasUserDeclaredCopyAssignment()) { 8758 // FIXME: this should use the location of the copy 8759 // assignment, not the type. 8760 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8761 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8762 return; 8763 } 8764 break; 8765 8766 case CXXMoveAssignment: 8767 if (RD->hasUserDeclaredMoveAssignment()) { 8768 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8769 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8770 return; 8771 } 8772 break; 8773 8774 case CXXDestructor: 8775 if (RD->hasUserDeclaredDestructor()) { 8776 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8777 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8778 return; 8779 } 8780 break; 8781 } 8782 8783 typedef CXXRecordDecl::base_class_iterator base_iter; 8784 8785 // Virtual bases and members inhibit trivial copying/construction, 8786 // but not trivial destruction. 8787 if (member != CXXDestructor) { 8788 // Check for virtual bases. vbases includes indirect virtual bases, 8789 // so we just iterate through the direct bases. 8790 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8791 if (bi->isVirtual()) { 8792 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8793 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8794 return; 8795 } 8796 8797 // Check for virtual methods. 8798 typedef CXXRecordDecl::method_iterator meth_iter; 8799 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8800 ++mi) { 8801 if (mi->isVirtual()) { 8802 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8803 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8804 return; 8805 } 8806 } 8807 } 8808 8809 bool (CXXRecordDecl::*hasTrivial)() const; 8810 switch (member) { 8811 case CXXDefaultConstructor: 8812 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8813 case CXXCopyConstructor: 8814 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8815 case CXXCopyAssignment: 8816 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8817 case CXXDestructor: 8818 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8819 default: 8820 llvm_unreachable("unexpected special member"); 8821 } 8822 8823 // Check for nontrivial bases (and recurse). 8824 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8825 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8826 assert(BaseRT && "Don't know how to handle dependent bases"); 8827 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8828 if (!(BaseRecTy->*hasTrivial)()) { 8829 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8830 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8831 DiagnoseNontrivial(BaseRT, member); 8832 return; 8833 } 8834 } 8835 8836 // Check for nontrivial members (and recurse). 8837 typedef RecordDecl::field_iterator field_iter; 8838 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8839 ++fi) { 8840 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8841 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8842 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8843 8844 if (!(EltRD->*hasTrivial)()) { 8845 SourceLocation FLoc = (*fi)->getLocation(); 8846 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8847 DiagnoseNontrivial(EltRT, member); 8848 return; 8849 } 8850 } 8851 8852 if (EltTy->isObjCLifetimeType()) { 8853 switch (EltTy.getObjCLifetime()) { 8854 case Qualifiers::OCL_None: 8855 case Qualifiers::OCL_ExplicitNone: 8856 break; 8857 8858 case Qualifiers::OCL_Autoreleasing: 8859 case Qualifiers::OCL_Weak: 8860 case Qualifiers::OCL_Strong: 8861 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8862 << QT << EltTy.getObjCLifetime(); 8863 return; 8864 } 8865 } 8866 } 8867 8868 llvm_unreachable("found no explanation for non-trivial member"); 8869} 8870 8871/// TranslateIvarVisibility - Translate visibility from a token ID to an 8872/// AST enum value. 8873static ObjCIvarDecl::AccessControl 8874TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8875 switch (ivarVisibility) { 8876 default: llvm_unreachable("Unknown visitibility kind"); 8877 case tok::objc_private: return ObjCIvarDecl::Private; 8878 case tok::objc_public: return ObjCIvarDecl::Public; 8879 case tok::objc_protected: return ObjCIvarDecl::Protected; 8880 case tok::objc_package: return ObjCIvarDecl::Package; 8881 } 8882} 8883 8884/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8885/// in order to create an IvarDecl object for it. 8886Decl *Sema::ActOnIvar(Scope *S, 8887 SourceLocation DeclStart, 8888 Declarator &D, Expr *BitfieldWidth, 8889 tok::ObjCKeywordKind Visibility) { 8890 8891 IdentifierInfo *II = D.getIdentifier(); 8892 Expr *BitWidth = (Expr*)BitfieldWidth; 8893 SourceLocation Loc = DeclStart; 8894 if (II) Loc = D.getIdentifierLoc(); 8895 8896 // FIXME: Unnamed fields can be handled in various different ways, for 8897 // example, unnamed unions inject all members into the struct namespace! 8898 8899 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8900 QualType T = TInfo->getType(); 8901 8902 if (BitWidth) { 8903 // 6.7.2.1p3, 6.7.2.1p4 8904 if (VerifyBitField(Loc, II, T, BitWidth)) { 8905 D.setInvalidType(); 8906 BitWidth = 0; 8907 } 8908 } else { 8909 // Not a bitfield. 8910 8911 // validate II. 8912 8913 } 8914 if (T->isReferenceType()) { 8915 Diag(Loc, diag::err_ivar_reference_type); 8916 D.setInvalidType(); 8917 } 8918 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8919 // than a variably modified type. 8920 else if (T->isVariablyModifiedType()) { 8921 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8922 D.setInvalidType(); 8923 } 8924 8925 // Get the visibility (access control) for this ivar. 8926 ObjCIvarDecl::AccessControl ac = 8927 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8928 : ObjCIvarDecl::None; 8929 // Must set ivar's DeclContext to its enclosing interface. 8930 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8931 ObjCContainerDecl *EnclosingContext; 8932 if (ObjCImplementationDecl *IMPDecl = 8933 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8934 if (!LangOpts.ObjCNonFragileABI2) { 8935 // Case of ivar declared in an implementation. Context is that of its class. 8936 EnclosingContext = IMPDecl->getClassInterface(); 8937 assert(EnclosingContext && "Implementation has no class interface!"); 8938 } 8939 else 8940 EnclosingContext = EnclosingDecl; 8941 } else { 8942 if (ObjCCategoryDecl *CDecl = 8943 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8944 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8945 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8946 return 0; 8947 } 8948 } 8949 EnclosingContext = EnclosingDecl; 8950 } 8951 8952 // Construct the decl. 8953 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8954 DeclStart, Loc, II, T, 8955 TInfo, ac, (Expr *)BitfieldWidth); 8956 8957 if (II) { 8958 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8959 ForRedeclaration); 8960 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8961 && !isa<TagDecl>(PrevDecl)) { 8962 Diag(Loc, diag::err_duplicate_member) << II; 8963 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8964 NewID->setInvalidDecl(); 8965 } 8966 } 8967 8968 // Process attributes attached to the ivar. 8969 ProcessDeclAttributes(S, NewID, D); 8970 8971 if (D.isInvalidType()) 8972 NewID->setInvalidDecl(); 8973 8974 // In ARC, infer 'retaining' for ivars of retainable type. 8975 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8976 NewID->setInvalidDecl(); 8977 8978 if (D.getDeclSpec().isModulePrivateSpecified()) 8979 NewID->setModulePrivate(); 8980 8981 if (II) { 8982 // FIXME: When interfaces are DeclContexts, we'll need to add 8983 // these to the interface. 8984 S->AddDecl(NewID); 8985 IdResolver.AddDecl(NewID); 8986 } 8987 8988 return NewID; 8989} 8990 8991/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8992/// class and class extensions. For every class @interface and class 8993/// extension @interface, if the last ivar is a bitfield of any type, 8994/// then add an implicit `char :0` ivar to the end of that interface. 8995void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8996 SmallVectorImpl<Decl *> &AllIvarDecls) { 8997 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8998 return; 8999 9000 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9001 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9002 9003 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9004 return; 9005 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9006 if (!ID) { 9007 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9008 if (!CD->IsClassExtension()) 9009 return; 9010 } 9011 // No need to add this to end of @implementation. 9012 else 9013 return; 9014 } 9015 // All conditions are met. Add a new bitfield to the tail end of ivars. 9016 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9017 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9018 9019 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9020 DeclLoc, DeclLoc, 0, 9021 Context.CharTy, 9022 Context.getTrivialTypeSourceInfo(Context.CharTy, 9023 DeclLoc), 9024 ObjCIvarDecl::Private, BW, 9025 true); 9026 AllIvarDecls.push_back(Ivar); 9027} 9028 9029void Sema::ActOnFields(Scope* S, 9030 SourceLocation RecLoc, Decl *EnclosingDecl, 9031 llvm::ArrayRef<Decl *> Fields, 9032 SourceLocation LBrac, SourceLocation RBrac, 9033 AttributeList *Attr) { 9034 assert(EnclosingDecl && "missing record or interface decl"); 9035 9036 // If the decl this is being inserted into is invalid, then it may be a 9037 // redeclaration or some other bogus case. Don't try to add fields to it. 9038 if (EnclosingDecl->isInvalidDecl()) 9039 return; 9040 9041 // Verify that all the fields are okay. 9042 unsigned NumNamedMembers = 0; 9043 SmallVector<FieldDecl*, 32> RecFields; 9044 9045 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9046 bool ARCErrReported = false; 9047 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9048 i != end; ++i) { 9049 FieldDecl *FD = cast<FieldDecl>(*i); 9050 9051 // Get the type for the field. 9052 const Type *FDTy = FD->getType().getTypePtr(); 9053 9054 if (!FD->isAnonymousStructOrUnion()) { 9055 // Remember all fields written by the user. 9056 RecFields.push_back(FD); 9057 } 9058 9059 // If the field is already invalid for some reason, don't emit more 9060 // diagnostics about it. 9061 if (FD->isInvalidDecl()) { 9062 EnclosingDecl->setInvalidDecl(); 9063 continue; 9064 } 9065 9066 // C99 6.7.2.1p2: 9067 // A structure or union shall not contain a member with 9068 // incomplete or function type (hence, a structure shall not 9069 // contain an instance of itself, but may contain a pointer to 9070 // an instance of itself), except that the last member of a 9071 // structure with more than one named member may have incomplete 9072 // array type; such a structure (and any union containing, 9073 // possibly recursively, a member that is such a structure) 9074 // shall not be a member of a structure or an element of an 9075 // array. 9076 if (FDTy->isFunctionType()) { 9077 // Field declared as a function. 9078 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9079 << FD->getDeclName(); 9080 FD->setInvalidDecl(); 9081 EnclosingDecl->setInvalidDecl(); 9082 continue; 9083 } else if (FDTy->isIncompleteArrayType() && Record && 9084 ((i + 1 == Fields.end() && !Record->isUnion()) || 9085 ((getLangOptions().MicrosoftExt || 9086 getLangOptions().CPlusPlus) && 9087 (i + 1 == Fields.end() || Record->isUnion())))) { 9088 // Flexible array member. 9089 // Microsoft and g++ is more permissive regarding flexible array. 9090 // It will accept flexible array in union and also 9091 // as the sole element of a struct/class. 9092 if (getLangOptions().MicrosoftExt) { 9093 if (Record->isUnion()) 9094 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9095 << FD->getDeclName(); 9096 else if (Fields.size() == 1) 9097 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9098 << FD->getDeclName() << Record->getTagKind(); 9099 } else if (getLangOptions().CPlusPlus) { 9100 if (Record->isUnion()) 9101 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9102 << FD->getDeclName(); 9103 else if (Fields.size() == 1) 9104 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9105 << FD->getDeclName() << Record->getTagKind(); 9106 } else if (NumNamedMembers < 1) { 9107 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9108 << FD->getDeclName(); 9109 FD->setInvalidDecl(); 9110 EnclosingDecl->setInvalidDecl(); 9111 continue; 9112 } 9113 if (!FD->getType()->isDependentType() && 9114 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9115 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9116 << FD->getDeclName() << FD->getType(); 9117 FD->setInvalidDecl(); 9118 EnclosingDecl->setInvalidDecl(); 9119 continue; 9120 } 9121 // Okay, we have a legal flexible array member at the end of the struct. 9122 if (Record) 9123 Record->setHasFlexibleArrayMember(true); 9124 } else if (!FDTy->isDependentType() && 9125 RequireCompleteType(FD->getLocation(), FD->getType(), 9126 diag::err_field_incomplete)) { 9127 // Incomplete type 9128 FD->setInvalidDecl(); 9129 EnclosingDecl->setInvalidDecl(); 9130 continue; 9131 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9132 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9133 // If this is a member of a union, then entire union becomes "flexible". 9134 if (Record && Record->isUnion()) { 9135 Record->setHasFlexibleArrayMember(true); 9136 } else { 9137 // If this is a struct/class and this is not the last element, reject 9138 // it. Note that GCC supports variable sized arrays in the middle of 9139 // structures. 9140 if (i + 1 != Fields.end()) 9141 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9142 << FD->getDeclName() << FD->getType(); 9143 else { 9144 // We support flexible arrays at the end of structs in 9145 // other structs as an extension. 9146 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9147 << FD->getDeclName(); 9148 if (Record) 9149 Record->setHasFlexibleArrayMember(true); 9150 } 9151 } 9152 } 9153 if (Record && FDTTy->getDecl()->hasObjectMember()) 9154 Record->setHasObjectMember(true); 9155 } else if (FDTy->isObjCObjectType()) { 9156 /// A field cannot be an Objective-c object 9157 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9158 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9159 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9160 FD->setType(T); 9161 } 9162 else if (!getLangOptions().CPlusPlus) { 9163 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9164 // It's an error in ARC if a field has lifetime. 9165 // We don't want to report this in a system header, though, 9166 // so we just make the field unavailable. 9167 // FIXME: that's really not sufficient; we need to make the type 9168 // itself invalid to, say, initialize or copy. 9169 QualType T = FD->getType(); 9170 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9171 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9172 SourceLocation loc = FD->getLocation(); 9173 if (getSourceManager().isInSystemHeader(loc)) { 9174 if (!FD->hasAttr<UnavailableAttr>()) { 9175 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9176 "this system field has retaining ownership")); 9177 } 9178 } else { 9179 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9180 } 9181 ARCErrReported = true; 9182 } 9183 } 9184 else if (getLangOptions().ObjC1 && 9185 getLangOptions().getGC() != LangOptions::NonGC && 9186 Record && !Record->hasObjectMember()) { 9187 if (FD->getType()->isObjCObjectPointerType() || 9188 FD->getType().isObjCGCStrong()) 9189 Record->setHasObjectMember(true); 9190 else if (Context.getAsArrayType(FD->getType())) { 9191 QualType BaseType = Context.getBaseElementType(FD->getType()); 9192 if (BaseType->isRecordType() && 9193 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9194 Record->setHasObjectMember(true); 9195 else if (BaseType->isObjCObjectPointerType() || 9196 BaseType.isObjCGCStrong()) 9197 Record->setHasObjectMember(true); 9198 } 9199 } 9200 } 9201 // Keep track of the number of named members. 9202 if (FD->getIdentifier()) 9203 ++NumNamedMembers; 9204 } 9205 9206 // Okay, we successfully defined 'Record'. 9207 if (Record) { 9208 bool Completed = false; 9209 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9210 if (!CXXRecord->isInvalidDecl()) { 9211 // Set access bits correctly on the directly-declared conversions. 9212 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9213 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9214 I != E; ++I) 9215 Convs->setAccess(I, (*I)->getAccess()); 9216 9217 if (!CXXRecord->isDependentType()) { 9218 // Objective-C Automatic Reference Counting: 9219 // If a class has a non-static data member of Objective-C pointer 9220 // type (or array thereof), it is a non-POD type and its 9221 // default constructor (if any), copy constructor, copy assignment 9222 // operator, and destructor are non-trivial. 9223 // 9224 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9225 // However, here we check whether this particular class is only 9226 // non-POD because of the presence of an Objective-C pointer member. 9227 // If so, objects of this type cannot be shared between code compiled 9228 // with instant objects and code compiled with manual retain/release. 9229 if (getLangOptions().ObjCAutoRefCount && 9230 CXXRecord->hasObjectMember() && 9231 CXXRecord->getLinkage() == ExternalLinkage) { 9232 if (CXXRecord->isPOD()) { 9233 Diag(CXXRecord->getLocation(), 9234 diag::warn_arc_non_pod_class_with_object_member) 9235 << CXXRecord; 9236 } else { 9237 // FIXME: Fix-Its would be nice here, but finding a good location 9238 // for them is going to be tricky. 9239 if (CXXRecord->hasTrivialCopyConstructor()) 9240 Diag(CXXRecord->getLocation(), 9241 diag::warn_arc_trivial_member_function_with_object_member) 9242 << CXXRecord << 0; 9243 if (CXXRecord->hasTrivialCopyAssignment()) 9244 Diag(CXXRecord->getLocation(), 9245 diag::warn_arc_trivial_member_function_with_object_member) 9246 << CXXRecord << 1; 9247 if (CXXRecord->hasTrivialDestructor()) 9248 Diag(CXXRecord->getLocation(), 9249 diag::warn_arc_trivial_member_function_with_object_member) 9250 << CXXRecord << 2; 9251 } 9252 } 9253 9254 // Adjust user-defined destructor exception spec. 9255 if (getLangOptions().CPlusPlus0x && 9256 CXXRecord->hasUserDeclaredDestructor()) 9257 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9258 9259 // Add any implicitly-declared members to this class. 9260 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9261 9262 // If we have virtual base classes, we may end up finding multiple 9263 // final overriders for a given virtual function. Check for this 9264 // problem now. 9265 if (CXXRecord->getNumVBases()) { 9266 CXXFinalOverriderMap FinalOverriders; 9267 CXXRecord->getFinalOverriders(FinalOverriders); 9268 9269 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9270 MEnd = FinalOverriders.end(); 9271 M != MEnd; ++M) { 9272 for (OverridingMethods::iterator SO = M->second.begin(), 9273 SOEnd = M->second.end(); 9274 SO != SOEnd; ++SO) { 9275 assert(SO->second.size() > 0 && 9276 "Virtual function without overridding functions?"); 9277 if (SO->second.size() == 1) 9278 continue; 9279 9280 // C++ [class.virtual]p2: 9281 // In a derived class, if a virtual member function of a base 9282 // class subobject has more than one final overrider the 9283 // program is ill-formed. 9284 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9285 << (NamedDecl *)M->first << Record; 9286 Diag(M->first->getLocation(), 9287 diag::note_overridden_virtual_function); 9288 for (OverridingMethods::overriding_iterator 9289 OM = SO->second.begin(), 9290 OMEnd = SO->second.end(); 9291 OM != OMEnd; ++OM) 9292 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9293 << (NamedDecl *)M->first << OM->Method->getParent(); 9294 9295 Record->setInvalidDecl(); 9296 } 9297 } 9298 CXXRecord->completeDefinition(&FinalOverriders); 9299 Completed = true; 9300 } 9301 } 9302 } 9303 } 9304 9305 if (!Completed) 9306 Record->completeDefinition(); 9307 9308 // Now that the record is complete, do any delayed exception spec checks 9309 // we were missing. 9310 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9311 const CXXDestructorDecl *Dtor = 9312 DelayedDestructorExceptionSpecChecks.back().first; 9313 if (Dtor->getParent() != Record) 9314 break; 9315 9316 assert(!Dtor->getParent()->isDependentType() && 9317 "Should not ever add destructors of templates into the list."); 9318 CheckOverridingFunctionExceptionSpec(Dtor, 9319 DelayedDestructorExceptionSpecChecks.back().second); 9320 DelayedDestructorExceptionSpecChecks.pop_back(); 9321 } 9322 9323 } else { 9324 ObjCIvarDecl **ClsFields = 9325 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9326 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9327 ID->setLocEnd(RBrac); 9328 // Add ivar's to class's DeclContext. 9329 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9330 ClsFields[i]->setLexicalDeclContext(ID); 9331 ID->addDecl(ClsFields[i]); 9332 } 9333 // Must enforce the rule that ivars in the base classes may not be 9334 // duplicates. 9335 if (ID->getSuperClass()) 9336 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9337 } else if (ObjCImplementationDecl *IMPDecl = 9338 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9339 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9340 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9341 // Ivar declared in @implementation never belongs to the implementation. 9342 // Only it is in implementation's lexical context. 9343 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9344 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9345 } else if (ObjCCategoryDecl *CDecl = 9346 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9347 // case of ivars in class extension; all other cases have been 9348 // reported as errors elsewhere. 9349 // FIXME. Class extension does not have a LocEnd field. 9350 // CDecl->setLocEnd(RBrac); 9351 // Add ivar's to class extension's DeclContext. 9352 // Diagnose redeclaration of private ivars. 9353 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9354 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9355 if (IDecl) { 9356 if (const ObjCIvarDecl *ClsIvar = 9357 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9358 Diag(ClsFields[i]->getLocation(), 9359 diag::err_duplicate_ivar_declaration); 9360 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9361 continue; 9362 } 9363 for (const ObjCCategoryDecl *ClsExtDecl = 9364 IDecl->getFirstClassExtension(); 9365 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9366 if (const ObjCIvarDecl *ClsExtIvar = 9367 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9368 Diag(ClsFields[i]->getLocation(), 9369 diag::err_duplicate_ivar_declaration); 9370 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9371 continue; 9372 } 9373 } 9374 } 9375 ClsFields[i]->setLexicalDeclContext(CDecl); 9376 CDecl->addDecl(ClsFields[i]); 9377 } 9378 } 9379 } 9380 9381 if (Attr) 9382 ProcessDeclAttributeList(S, Record, Attr); 9383 9384 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9385 // set the visibility of this record. 9386 if (Record && !Record->getDeclContext()->isRecord()) 9387 AddPushedVisibilityAttribute(Record); 9388} 9389 9390/// \brief Determine whether the given integral value is representable within 9391/// the given type T. 9392static bool isRepresentableIntegerValue(ASTContext &Context, 9393 llvm::APSInt &Value, 9394 QualType T) { 9395 assert(T->isIntegralType(Context) && "Integral type required!"); 9396 unsigned BitWidth = Context.getIntWidth(T); 9397 9398 if (Value.isUnsigned() || Value.isNonNegative()) { 9399 if (T->isSignedIntegerOrEnumerationType()) 9400 --BitWidth; 9401 return Value.getActiveBits() <= BitWidth; 9402 } 9403 return Value.getMinSignedBits() <= BitWidth; 9404} 9405 9406// \brief Given an integral type, return the next larger integral type 9407// (or a NULL type of no such type exists). 9408static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9409 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9410 // enum checking below. 9411 assert(T->isIntegralType(Context) && "Integral type required!"); 9412 const unsigned NumTypes = 4; 9413 QualType SignedIntegralTypes[NumTypes] = { 9414 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9415 }; 9416 QualType UnsignedIntegralTypes[NumTypes] = { 9417 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9418 Context.UnsignedLongLongTy 9419 }; 9420 9421 unsigned BitWidth = Context.getTypeSize(T); 9422 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9423 : UnsignedIntegralTypes; 9424 for (unsigned I = 0; I != NumTypes; ++I) 9425 if (Context.getTypeSize(Types[I]) > BitWidth) 9426 return Types[I]; 9427 9428 return QualType(); 9429} 9430 9431EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9432 EnumConstantDecl *LastEnumConst, 9433 SourceLocation IdLoc, 9434 IdentifierInfo *Id, 9435 Expr *Val) { 9436 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9437 llvm::APSInt EnumVal(IntWidth); 9438 QualType EltTy; 9439 9440 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9441 Val = 0; 9442 9443 if (Val) { 9444 if (Enum->isDependentType() || Val->isTypeDependent()) 9445 EltTy = Context.DependentTy; 9446 else { 9447 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9448 SourceLocation ExpLoc; 9449 if (!Val->isValueDependent() && 9450 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9451 Val = 0; 9452 } else { 9453 if (!getLangOptions().CPlusPlus) { 9454 // C99 6.7.2.2p2: 9455 // The expression that defines the value of an enumeration constant 9456 // shall be an integer constant expression that has a value 9457 // representable as an int. 9458 9459 // Complain if the value is not representable in an int. 9460 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9461 Diag(IdLoc, diag::ext_enum_value_not_int) 9462 << EnumVal.toString(10) << Val->getSourceRange() 9463 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9464 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9465 // Force the type of the expression to 'int'. 9466 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9467 } 9468 } 9469 9470 if (Enum->isFixed()) { 9471 EltTy = Enum->getIntegerType(); 9472 9473 // C++0x [dcl.enum]p5: 9474 // ... if the initializing value of an enumerator cannot be 9475 // represented by the underlying type, the program is ill-formed. 9476 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9477 if (getLangOptions().MicrosoftExt) { 9478 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9479 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9480 } else 9481 Diag(IdLoc, diag::err_enumerator_too_large) 9482 << EltTy; 9483 } else 9484 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9485 } 9486 else { 9487 // C++0x [dcl.enum]p5: 9488 // If the underlying type is not fixed, the type of each enumerator 9489 // is the type of its initializing value: 9490 // - If an initializer is specified for an enumerator, the 9491 // initializing value has the same type as the expression. 9492 EltTy = Val->getType(); 9493 } 9494 } 9495 } 9496 } 9497 9498 if (!Val) { 9499 if (Enum->isDependentType()) 9500 EltTy = Context.DependentTy; 9501 else if (!LastEnumConst) { 9502 // C++0x [dcl.enum]p5: 9503 // If the underlying type is not fixed, the type of each enumerator 9504 // is the type of its initializing value: 9505 // - If no initializer is specified for the first enumerator, the 9506 // initializing value has an unspecified integral type. 9507 // 9508 // GCC uses 'int' for its unspecified integral type, as does 9509 // C99 6.7.2.2p3. 9510 if (Enum->isFixed()) { 9511 EltTy = Enum->getIntegerType(); 9512 } 9513 else { 9514 EltTy = Context.IntTy; 9515 } 9516 } else { 9517 // Assign the last value + 1. 9518 EnumVal = LastEnumConst->getInitVal(); 9519 ++EnumVal; 9520 EltTy = LastEnumConst->getType(); 9521 9522 // Check for overflow on increment. 9523 if (EnumVal < LastEnumConst->getInitVal()) { 9524 // C++0x [dcl.enum]p5: 9525 // If the underlying type is not fixed, the type of each enumerator 9526 // is the type of its initializing value: 9527 // 9528 // - Otherwise the type of the initializing value is the same as 9529 // the type of the initializing value of the preceding enumerator 9530 // unless the incremented value is not representable in that type, 9531 // in which case the type is an unspecified integral type 9532 // sufficient to contain the incremented value. If no such type 9533 // exists, the program is ill-formed. 9534 QualType T = getNextLargerIntegralType(Context, EltTy); 9535 if (T.isNull() || Enum->isFixed()) { 9536 // There is no integral type larger enough to represent this 9537 // value. Complain, then allow the value to wrap around. 9538 EnumVal = LastEnumConst->getInitVal(); 9539 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9540 ++EnumVal; 9541 if (Enum->isFixed()) 9542 // When the underlying type is fixed, this is ill-formed. 9543 Diag(IdLoc, diag::err_enumerator_wrapped) 9544 << EnumVal.toString(10) 9545 << EltTy; 9546 else 9547 Diag(IdLoc, diag::warn_enumerator_too_large) 9548 << EnumVal.toString(10); 9549 } else { 9550 EltTy = T; 9551 } 9552 9553 // Retrieve the last enumerator's value, extent that type to the 9554 // type that is supposed to be large enough to represent the incremented 9555 // value, then increment. 9556 EnumVal = LastEnumConst->getInitVal(); 9557 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9558 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9559 ++EnumVal; 9560 9561 // If we're not in C++, diagnose the overflow of enumerator values, 9562 // which in C99 means that the enumerator value is not representable in 9563 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9564 // permits enumerator values that are representable in some larger 9565 // integral type. 9566 if (!getLangOptions().CPlusPlus && !T.isNull()) 9567 Diag(IdLoc, diag::warn_enum_value_overflow); 9568 } else if (!getLangOptions().CPlusPlus && 9569 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9570 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9571 Diag(IdLoc, diag::ext_enum_value_not_int) 9572 << EnumVal.toString(10) << 1; 9573 } 9574 } 9575 } 9576 9577 if (!EltTy->isDependentType()) { 9578 // Make the enumerator value match the signedness and size of the 9579 // enumerator's type. 9580 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9581 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9582 } 9583 9584 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9585 Val, EnumVal); 9586} 9587 9588 9589Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9590 SourceLocation IdLoc, IdentifierInfo *Id, 9591 AttributeList *Attr, 9592 SourceLocation EqualLoc, Expr *val) { 9593 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9594 EnumConstantDecl *LastEnumConst = 9595 cast_or_null<EnumConstantDecl>(lastEnumConst); 9596 Expr *Val = static_cast<Expr*>(val); 9597 9598 // The scope passed in may not be a decl scope. Zip up the scope tree until 9599 // we find one that is. 9600 S = getNonFieldDeclScope(S); 9601 9602 // Verify that there isn't already something declared with this name in this 9603 // scope. 9604 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9605 ForRedeclaration); 9606 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9607 // Maybe we will complain about the shadowed template parameter. 9608 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9609 // Just pretend that we didn't see the previous declaration. 9610 PrevDecl = 0; 9611 } 9612 9613 if (PrevDecl) { 9614 // When in C++, we may get a TagDecl with the same name; in this case the 9615 // enum constant will 'hide' the tag. 9616 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9617 "Received TagDecl when not in C++!"); 9618 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9619 if (isa<EnumConstantDecl>(PrevDecl)) 9620 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9621 else 9622 Diag(IdLoc, diag::err_redefinition) << Id; 9623 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9624 return 0; 9625 } 9626 } 9627 9628 // C++ [class.mem]p13: 9629 // If T is the name of a class, then each of the following shall have a 9630 // name different from T: 9631 // - every enumerator of every member of class T that is an enumerated 9632 // type 9633 if (CXXRecordDecl *Record 9634 = dyn_cast<CXXRecordDecl>( 9635 TheEnumDecl->getDeclContext()->getRedeclContext())) 9636 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9637 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9638 9639 EnumConstantDecl *New = 9640 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9641 9642 if (New) { 9643 // Process attributes. 9644 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9645 9646 // Register this decl in the current scope stack. 9647 New->setAccess(TheEnumDecl->getAccess()); 9648 PushOnScopeChains(New, S); 9649 } 9650 9651 return New; 9652} 9653 9654void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9655 SourceLocation RBraceLoc, Decl *EnumDeclX, 9656 Decl **Elements, unsigned NumElements, 9657 Scope *S, AttributeList *Attr) { 9658 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9659 QualType EnumType = Context.getTypeDeclType(Enum); 9660 9661 if (Attr) 9662 ProcessDeclAttributeList(S, Enum, Attr); 9663 9664 if (Enum->isDependentType()) { 9665 for (unsigned i = 0; i != NumElements; ++i) { 9666 EnumConstantDecl *ECD = 9667 cast_or_null<EnumConstantDecl>(Elements[i]); 9668 if (!ECD) continue; 9669 9670 ECD->setType(EnumType); 9671 } 9672 9673 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9674 return; 9675 } 9676 9677 // TODO: If the result value doesn't fit in an int, it must be a long or long 9678 // long value. ISO C does not support this, but GCC does as an extension, 9679 // emit a warning. 9680 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9681 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9682 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9683 9684 // Verify that all the values are okay, compute the size of the values, and 9685 // reverse the list. 9686 unsigned NumNegativeBits = 0; 9687 unsigned NumPositiveBits = 0; 9688 9689 // Keep track of whether all elements have type int. 9690 bool AllElementsInt = true; 9691 9692 for (unsigned i = 0; i != NumElements; ++i) { 9693 EnumConstantDecl *ECD = 9694 cast_or_null<EnumConstantDecl>(Elements[i]); 9695 if (!ECD) continue; // Already issued a diagnostic. 9696 9697 const llvm::APSInt &InitVal = ECD->getInitVal(); 9698 9699 // Keep track of the size of positive and negative values. 9700 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9701 NumPositiveBits = std::max(NumPositiveBits, 9702 (unsigned)InitVal.getActiveBits()); 9703 else 9704 NumNegativeBits = std::max(NumNegativeBits, 9705 (unsigned)InitVal.getMinSignedBits()); 9706 9707 // Keep track of whether every enum element has type int (very commmon). 9708 if (AllElementsInt) 9709 AllElementsInt = ECD->getType() == Context.IntTy; 9710 } 9711 9712 // Figure out the type that should be used for this enum. 9713 QualType BestType; 9714 unsigned BestWidth; 9715 9716 // C++0x N3000 [conv.prom]p3: 9717 // An rvalue of an unscoped enumeration type whose underlying 9718 // type is not fixed can be converted to an rvalue of the first 9719 // of the following types that can represent all the values of 9720 // the enumeration: int, unsigned int, long int, unsigned long 9721 // int, long long int, or unsigned long long int. 9722 // C99 6.4.4.3p2: 9723 // An identifier declared as an enumeration constant has type int. 9724 // The C99 rule is modified by a gcc extension 9725 QualType BestPromotionType; 9726 9727 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9728 // -fshort-enums is the equivalent to specifying the packed attribute on all 9729 // enum definitions. 9730 if (LangOpts.ShortEnums) 9731 Packed = true; 9732 9733 if (Enum->isFixed()) { 9734 BestType = Enum->getIntegerType(); 9735 if (BestType->isPromotableIntegerType()) 9736 BestPromotionType = Context.getPromotedIntegerType(BestType); 9737 else 9738 BestPromotionType = BestType; 9739 // We don't need to set BestWidth, because BestType is going to be the type 9740 // of the enumerators, but we do anyway because otherwise some compilers 9741 // warn that it might be used uninitialized. 9742 BestWidth = CharWidth; 9743 } 9744 else if (NumNegativeBits) { 9745 // If there is a negative value, figure out the smallest integer type (of 9746 // int/long/longlong) that fits. 9747 // If it's packed, check also if it fits a char or a short. 9748 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9749 BestType = Context.SignedCharTy; 9750 BestWidth = CharWidth; 9751 } else if (Packed && NumNegativeBits <= ShortWidth && 9752 NumPositiveBits < ShortWidth) { 9753 BestType = Context.ShortTy; 9754 BestWidth = ShortWidth; 9755 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9756 BestType = Context.IntTy; 9757 BestWidth = IntWidth; 9758 } else { 9759 BestWidth = Context.getTargetInfo().getLongWidth(); 9760 9761 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9762 BestType = Context.LongTy; 9763 } else { 9764 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9765 9766 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9767 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9768 BestType = Context.LongLongTy; 9769 } 9770 } 9771 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9772 } else { 9773 // If there is no negative value, figure out the smallest type that fits 9774 // all of the enumerator values. 9775 // If it's packed, check also if it fits a char or a short. 9776 if (Packed && NumPositiveBits <= CharWidth) { 9777 BestType = Context.UnsignedCharTy; 9778 BestPromotionType = Context.IntTy; 9779 BestWidth = CharWidth; 9780 } else if (Packed && NumPositiveBits <= ShortWidth) { 9781 BestType = Context.UnsignedShortTy; 9782 BestPromotionType = Context.IntTy; 9783 BestWidth = ShortWidth; 9784 } else if (NumPositiveBits <= IntWidth) { 9785 BestType = Context.UnsignedIntTy; 9786 BestWidth = IntWidth; 9787 BestPromotionType 9788 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9789 ? Context.UnsignedIntTy : Context.IntTy; 9790 } else if (NumPositiveBits <= 9791 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9792 BestType = Context.UnsignedLongTy; 9793 BestPromotionType 9794 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9795 ? Context.UnsignedLongTy : Context.LongTy; 9796 } else { 9797 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9798 assert(NumPositiveBits <= BestWidth && 9799 "How could an initializer get larger than ULL?"); 9800 BestType = Context.UnsignedLongLongTy; 9801 BestPromotionType 9802 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9803 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9804 } 9805 } 9806 9807 // Loop over all of the enumerator constants, changing their types to match 9808 // the type of the enum if needed. 9809 for (unsigned i = 0; i != NumElements; ++i) { 9810 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9811 if (!ECD) continue; // Already issued a diagnostic. 9812 9813 // Standard C says the enumerators have int type, but we allow, as an 9814 // extension, the enumerators to be larger than int size. If each 9815 // enumerator value fits in an int, type it as an int, otherwise type it the 9816 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9817 // that X has type 'int', not 'unsigned'. 9818 9819 // Determine whether the value fits into an int. 9820 llvm::APSInt InitVal = ECD->getInitVal(); 9821 9822 // If it fits into an integer type, force it. Otherwise force it to match 9823 // the enum decl type. 9824 QualType NewTy; 9825 unsigned NewWidth; 9826 bool NewSign; 9827 if (!getLangOptions().CPlusPlus && 9828 !Enum->isFixed() && 9829 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9830 NewTy = Context.IntTy; 9831 NewWidth = IntWidth; 9832 NewSign = true; 9833 } else if (ECD->getType() == BestType) { 9834 // Already the right type! 9835 if (getLangOptions().CPlusPlus) 9836 // C++ [dcl.enum]p4: Following the closing brace of an 9837 // enum-specifier, each enumerator has the type of its 9838 // enumeration. 9839 ECD->setType(EnumType); 9840 continue; 9841 } else { 9842 NewTy = BestType; 9843 NewWidth = BestWidth; 9844 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9845 } 9846 9847 // Adjust the APSInt value. 9848 InitVal = InitVal.extOrTrunc(NewWidth); 9849 InitVal.setIsSigned(NewSign); 9850 ECD->setInitVal(InitVal); 9851 9852 // Adjust the Expr initializer and type. 9853 if (ECD->getInitExpr() && 9854 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9855 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9856 CK_IntegralCast, 9857 ECD->getInitExpr(), 9858 /*base paths*/ 0, 9859 VK_RValue)); 9860 if (getLangOptions().CPlusPlus) 9861 // C++ [dcl.enum]p4: Following the closing brace of an 9862 // enum-specifier, each enumerator has the type of its 9863 // enumeration. 9864 ECD->setType(EnumType); 9865 else 9866 ECD->setType(NewTy); 9867 } 9868 9869 Enum->completeDefinition(BestType, BestPromotionType, 9870 NumPositiveBits, NumNegativeBits); 9871} 9872 9873Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9874 SourceLocation StartLoc, 9875 SourceLocation EndLoc) { 9876 StringLiteral *AsmString = cast<StringLiteral>(expr); 9877 9878 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9879 AsmString, StartLoc, 9880 EndLoc); 9881 CurContext->addDecl(New); 9882 return New; 9883} 9884 9885DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9886 IdentifierInfo &ModuleName, 9887 SourceLocation ModuleNameLoc) { 9888 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9889 ModuleName, ModuleNameLoc); 9890 if (!Module) 9891 return true; 9892 9893 // FIXME: Actually create a declaration to describe the module import. 9894 (void)Module; 9895 return DeclResult((Decl *)0); 9896} 9897 9898void 9899Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9900 SourceLocation ModulePrivateKeyword) { 9901 assert(!Old->isModulePrivate() && "Old is module-private!"); 9902 9903 Diag(New->getLocation(), diag::err_module_private_follows_public) 9904 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9905 Diag(Old->getLocation(), diag::note_previous_declaration) 9906 << Old->getDeclName(); 9907 9908 // Drop the __module_private__ from the new declaration, since it's invalid. 9909 New->setModulePrivate(false); 9910} 9911 9912void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9913 SourceLocation PragmaLoc, 9914 SourceLocation NameLoc) { 9915 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9916 9917 if (PrevDecl) { 9918 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9919 } else { 9920 (void)WeakUndeclaredIdentifiers.insert( 9921 std::pair<IdentifierInfo*,WeakInfo> 9922 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9923 } 9924} 9925 9926void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9927 IdentifierInfo* AliasName, 9928 SourceLocation PragmaLoc, 9929 SourceLocation NameLoc, 9930 SourceLocation AliasNameLoc) { 9931 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9932 LookupOrdinaryName); 9933 WeakInfo W = WeakInfo(Name, NameLoc); 9934 9935 if (PrevDecl) { 9936 if (!PrevDecl->hasAttr<AliasAttr>()) 9937 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9938 DeclApplyPragmaWeak(TUScope, ND, W); 9939 } else { 9940 (void)WeakUndeclaredIdentifiers.insert( 9941 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9942 } 9943} 9944 9945Decl *Sema::getObjCDeclContext() const { 9946 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9947} 9948 9949AvailabilityResult Sema::getCurContextAvailability() const { 9950 const Decl *D = cast<Decl>(getCurLexicalContext()); 9951 // A category implicitly has the availability of the interface. 9952 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9953 D = CatD->getClassInterface(); 9954 9955 return D->getAvailability(); 9956} 9957