SemaDecl.cpp revision 122de3e131a6902d22c97471520ec9005cca6f03
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 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3156 3157 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3158 Dcl->getDeclContext()->isFileContext()) 3159 Dcl->setTopLevelDeclInObjCContainer(); 3160 3161 return Dcl; 3162} 3163 3164/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3165/// If T is the name of a class, then each of the following shall have a 3166/// name different from T: 3167/// - every static data member of class T; 3168/// - every member function of class T 3169/// - every member of class T that is itself a type; 3170/// \returns true if the declaration name violates these rules. 3171bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3172 DeclarationNameInfo NameInfo) { 3173 DeclarationName Name = NameInfo.getName(); 3174 3175 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3176 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3177 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3178 return true; 3179 } 3180 3181 return false; 3182} 3183 3184Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3185 MultiTemplateParamsArg TemplateParamLists) { 3186 // TODO: consider using NameInfo for diagnostic. 3187 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3188 DeclarationName Name = NameInfo.getName(); 3189 3190 // All of these full declarators require an identifier. If it doesn't have 3191 // one, the ParsedFreeStandingDeclSpec action should be used. 3192 if (!Name) { 3193 if (!D.isInvalidType()) // Reject this if we think it is valid. 3194 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3195 diag::err_declarator_need_ident) 3196 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3197 return 0; 3198 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3199 return 0; 3200 3201 // The scope passed in may not be a decl scope. Zip up the scope tree until 3202 // we find one that is. 3203 while ((S->getFlags() & Scope::DeclScope) == 0 || 3204 (S->getFlags() & Scope::TemplateParamScope) != 0) 3205 S = S->getParent(); 3206 3207 DeclContext *DC = CurContext; 3208 if (D.getCXXScopeSpec().isInvalid()) 3209 D.setInvalidType(); 3210 else if (D.getCXXScopeSpec().isSet()) { 3211 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3212 UPPC_DeclarationQualifier)) 3213 return 0; 3214 3215 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3216 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3217 if (!DC) { 3218 // If we could not compute the declaration context, it's because the 3219 // declaration context is dependent but does not refer to a class, 3220 // class template, or class template partial specialization. Complain 3221 // and return early, to avoid the coming semantic disaster. 3222 Diag(D.getIdentifierLoc(), 3223 diag::err_template_qualified_declarator_no_match) 3224 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3225 << D.getCXXScopeSpec().getRange(); 3226 return 0; 3227 } 3228 bool IsDependentContext = DC->isDependentContext(); 3229 3230 if (!IsDependentContext && 3231 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3232 return 0; 3233 3234 if (isa<CXXRecordDecl>(DC)) { 3235 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3236 Diag(D.getIdentifierLoc(), 3237 diag::err_member_def_undefined_record) 3238 << Name << DC << D.getCXXScopeSpec().getRange(); 3239 D.setInvalidType(); 3240 } else if (isa<CXXRecordDecl>(CurContext) && 3241 !D.getDeclSpec().isFriendSpecified()) { 3242 // The user provided a superfluous scope specifier inside a class 3243 // definition: 3244 // 3245 // class X { 3246 // void X::f(); 3247 // }; 3248 if (CurContext->Equals(DC)) { 3249 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3250 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3251 } else { 3252 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3253 << Name << D.getCXXScopeSpec().getRange(); 3254 3255 // C++ constructors and destructors with incorrect scopes can break 3256 // our AST invariants by having the wrong underlying types. If 3257 // that's the case, then drop this declaration entirely. 3258 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3259 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3260 !Context.hasSameType(Name.getCXXNameType(), 3261 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3262 return 0; 3263 } 3264 3265 // Pretend that this qualifier was not here. 3266 D.getCXXScopeSpec().clear(); 3267 } 3268 } 3269 3270 // Check whether we need to rebuild the type of the given 3271 // declaration in the current instantiation. 3272 if (EnteringContext && IsDependentContext && 3273 TemplateParamLists.size() != 0) { 3274 ContextRAII SavedContext(*this, DC); 3275 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3276 D.setInvalidType(); 3277 } 3278 } 3279 3280 if (DiagnoseClassNameShadow(DC, NameInfo)) 3281 // If this is a typedef, we'll end up spewing multiple diagnostics. 3282 // Just return early; it's safer. 3283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3284 return 0; 3285 3286 NamedDecl *New; 3287 3288 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3289 QualType R = TInfo->getType(); 3290 3291 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3292 UPPC_DeclarationType)) 3293 D.setInvalidType(); 3294 3295 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3296 ForRedeclaration); 3297 3298 // See if this is a redefinition of a variable in the same scope. 3299 if (!D.getCXXScopeSpec().isSet()) { 3300 bool IsLinkageLookup = false; 3301 3302 // If the declaration we're planning to build will be a function 3303 // or object with linkage, then look for another declaration with 3304 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3305 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3306 /* Do nothing*/; 3307 else if (R->isFunctionType()) { 3308 if (CurContext->isFunctionOrMethod() || 3309 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3310 IsLinkageLookup = true; 3311 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3312 IsLinkageLookup = true; 3313 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3314 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3315 IsLinkageLookup = true; 3316 3317 if (IsLinkageLookup) 3318 Previous.clear(LookupRedeclarationWithLinkage); 3319 3320 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3321 } else { // Something like "int foo::x;" 3322 LookupQualifiedName(Previous, DC); 3323 3324 // Don't consider using declarations as previous declarations for 3325 // out-of-line members. 3326 RemoveUsingDecls(Previous); 3327 3328 // C++ 7.3.1.2p2: 3329 // Members (including explicit specializations of templates) of a named 3330 // namespace can also be defined outside that namespace by explicit 3331 // qualification of the name being defined, provided that the entity being 3332 // defined was already declared in the namespace and the definition appears 3333 // after the point of declaration in a namespace that encloses the 3334 // declarations namespace. 3335 // 3336 // Note that we only check the context at this point. We don't yet 3337 // have enough information to make sure that PrevDecl is actually 3338 // the declaration we want to match. For example, given: 3339 // 3340 // class X { 3341 // void f(); 3342 // void f(float); 3343 // }; 3344 // 3345 // void X::f(int) { } // ill-formed 3346 // 3347 // In this case, PrevDecl will point to the overload set 3348 // containing the two f's declared in X, but neither of them 3349 // matches. 3350 3351 // First check whether we named the global scope. 3352 if (isa<TranslationUnitDecl>(DC)) { 3353 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3354 << Name << D.getCXXScopeSpec().getRange(); 3355 } else { 3356 DeclContext *Cur = CurContext; 3357 while (isa<LinkageSpecDecl>(Cur)) 3358 Cur = Cur->getParent(); 3359 if (!Cur->Encloses(DC)) { 3360 // The qualifying scope doesn't enclose the original declaration. 3361 // Emit diagnostic based on current scope. 3362 SourceLocation L = D.getIdentifierLoc(); 3363 SourceRange R = D.getCXXScopeSpec().getRange(); 3364 if (isa<FunctionDecl>(Cur)) 3365 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3366 else 3367 Diag(L, diag::err_invalid_declarator_scope) 3368 << Name << cast<NamedDecl>(DC) << R; 3369 D.setInvalidType(); 3370 } 3371 } 3372 } 3373 3374 if (Previous.isSingleResult() && 3375 Previous.getFoundDecl()->isTemplateParameter()) { 3376 // Maybe we will complain about the shadowed template parameter. 3377 if (!D.isInvalidType()) 3378 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3379 Previous.getFoundDecl()); 3380 3381 // Just pretend that we didn't see the previous declaration. 3382 Previous.clear(); 3383 } 3384 3385 // In C++, the previous declaration we find might be a tag type 3386 // (class or enum). In this case, the new declaration will hide the 3387 // tag type. Note that this does does not apply if we're declaring a 3388 // typedef (C++ [dcl.typedef]p4). 3389 if (Previous.isSingleTagDecl() && 3390 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3391 Previous.clear(); 3392 3393 bool AddToScope = true; 3394 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3395 if (TemplateParamLists.size()) { 3396 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3397 return 0; 3398 } 3399 3400 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3401 } else if (R->isFunctionType()) { 3402 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3403 move(TemplateParamLists), 3404 AddToScope); 3405 } else { 3406 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3407 move(TemplateParamLists)); 3408 } 3409 3410 if (New == 0) 3411 return 0; 3412 3413 // If this has an identifier and is not an invalid redeclaration or 3414 // function template specialization, add it to the scope stack. 3415 if (New->getDeclName() && AddToScope && 3416 !(D.isRedeclaration() && New->isInvalidDecl())) 3417 PushOnScopeChains(New, S); 3418 3419 return New; 3420} 3421 3422/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3423/// types into constant array types in certain situations which would otherwise 3424/// be errors (for GCC compatibility). 3425static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3426 ASTContext &Context, 3427 bool &SizeIsNegative, 3428 llvm::APSInt &Oversized) { 3429 // This method tries to turn a variable array into a constant 3430 // array even when the size isn't an ICE. This is necessary 3431 // for compatibility with code that depends on gcc's buggy 3432 // constant expression folding, like struct {char x[(int)(char*)2];} 3433 SizeIsNegative = false; 3434 Oversized = 0; 3435 3436 if (T->isDependentType()) 3437 return QualType(); 3438 3439 QualifierCollector Qs; 3440 const Type *Ty = Qs.strip(T); 3441 3442 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3443 QualType Pointee = PTy->getPointeeType(); 3444 QualType FixedType = 3445 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3446 Oversized); 3447 if (FixedType.isNull()) return FixedType; 3448 FixedType = Context.getPointerType(FixedType); 3449 return Qs.apply(Context, FixedType); 3450 } 3451 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3452 QualType Inner = PTy->getInnerType(); 3453 QualType FixedType = 3454 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3455 Oversized); 3456 if (FixedType.isNull()) return FixedType; 3457 FixedType = Context.getParenType(FixedType); 3458 return Qs.apply(Context, FixedType); 3459 } 3460 3461 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3462 if (!VLATy) 3463 return QualType(); 3464 // FIXME: We should probably handle this case 3465 if (VLATy->getElementType()->isVariablyModifiedType()) 3466 return QualType(); 3467 3468 Expr::EvalResult EvalResult; 3469 if (!VLATy->getSizeExpr() || 3470 !VLATy->getSizeExpr()->EvaluateAsRValue(EvalResult, Context) || 3471 !EvalResult.Val.isInt()) 3472 return QualType(); 3473 3474 // Check whether the array size is negative. 3475 llvm::APSInt &Res = EvalResult.Val.getInt(); 3476 if (Res.isSigned() && Res.isNegative()) { 3477 SizeIsNegative = true; 3478 return QualType(); 3479 } 3480 3481 // Check whether the array is too large to be addressed. 3482 unsigned ActiveSizeBits 3483 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3484 Res); 3485 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3486 Oversized = Res; 3487 return QualType(); 3488 } 3489 3490 return Context.getConstantArrayType(VLATy->getElementType(), 3491 Res, ArrayType::Normal, 0); 3492} 3493 3494/// \brief Register the given locally-scoped external C declaration so 3495/// that it can be found later for redeclarations 3496void 3497Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3498 const LookupResult &Previous, 3499 Scope *S) { 3500 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3501 "Decl is not a locally-scoped decl!"); 3502 // Note that we have a locally-scoped external with this name. 3503 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3504 3505 if (!Previous.isSingleResult()) 3506 return; 3507 3508 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3509 3510 // If there was a previous declaration of this variable, it may be 3511 // in our identifier chain. Update the identifier chain with the new 3512 // declaration. 3513 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3514 // The previous declaration was found on the identifer resolver 3515 // chain, so remove it from its scope. 3516 3517 if (S->isDeclScope(PrevDecl)) { 3518 // Special case for redeclarations in the SAME scope. 3519 // Because this declaration is going to be added to the identifier chain 3520 // later, we should temporarily take it OFF the chain. 3521 IdResolver.RemoveDecl(ND); 3522 3523 } else { 3524 // Find the scope for the original declaration. 3525 while (S && !S->isDeclScope(PrevDecl)) 3526 S = S->getParent(); 3527 } 3528 3529 if (S) 3530 S->RemoveDecl(PrevDecl); 3531 } 3532} 3533 3534llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3535Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3536 if (ExternalSource) { 3537 // Load locally-scoped external decls from the external source. 3538 SmallVector<NamedDecl *, 4> Decls; 3539 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3540 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3541 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3542 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3543 if (Pos == LocallyScopedExternalDecls.end()) 3544 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3545 } 3546 } 3547 3548 return LocallyScopedExternalDecls.find(Name); 3549} 3550 3551/// \brief Diagnose function specifiers on a declaration of an identifier that 3552/// does not identify a function. 3553void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3554 // FIXME: We should probably indicate the identifier in question to avoid 3555 // confusion for constructs like "inline int a(), b;" 3556 if (D.getDeclSpec().isInlineSpecified()) 3557 Diag(D.getDeclSpec().getInlineSpecLoc(), 3558 diag::err_inline_non_function); 3559 3560 if (D.getDeclSpec().isVirtualSpecified()) 3561 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3562 diag::err_virtual_non_function); 3563 3564 if (D.getDeclSpec().isExplicitSpecified()) 3565 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3566 diag::err_explicit_non_function); 3567} 3568 3569NamedDecl* 3570Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3571 TypeSourceInfo *TInfo, LookupResult &Previous) { 3572 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3573 if (D.getCXXScopeSpec().isSet()) { 3574 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3575 << D.getCXXScopeSpec().getRange(); 3576 D.setInvalidType(); 3577 // Pretend we didn't see the scope specifier. 3578 DC = CurContext; 3579 Previous.clear(); 3580 } 3581 3582 if (getLangOptions().CPlusPlus) { 3583 // Check that there are no default arguments (C++ only). 3584 CheckExtraCXXDefaultArguments(D); 3585 } 3586 3587 DiagnoseFunctionSpecifiers(D); 3588 3589 if (D.getDeclSpec().isThreadSpecified()) 3590 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3591 if (D.getDeclSpec().isConstexprSpecified()) 3592 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3593 << 1; 3594 3595 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3596 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3597 << D.getName().getSourceRange(); 3598 return 0; 3599 } 3600 3601 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3602 if (!NewTD) return 0; 3603 3604 // Handle attributes prior to checking for duplicates in MergeVarDecl 3605 ProcessDeclAttributes(S, NewTD, D); 3606 3607 CheckTypedefForVariablyModifiedType(S, NewTD); 3608 3609 bool Redeclaration = D.isRedeclaration(); 3610 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3611 D.setRedeclaration(Redeclaration); 3612 return ND; 3613} 3614 3615void 3616Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3617 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3618 // then it shall have block scope. 3619 // Note that variably modified types must be fixed before merging the decl so 3620 // that redeclarations will match. 3621 QualType T = NewTD->getUnderlyingType(); 3622 if (T->isVariablyModifiedType()) { 3623 getCurFunction()->setHasBranchProtectedScope(); 3624 3625 if (S->getFnParent() == 0) { 3626 bool SizeIsNegative; 3627 llvm::APSInt Oversized; 3628 QualType FixedTy = 3629 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3630 Oversized); 3631 if (!FixedTy.isNull()) { 3632 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3633 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3634 } else { 3635 if (SizeIsNegative) 3636 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3637 else if (T->isVariableArrayType()) 3638 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3639 else if (Oversized.getBoolValue()) 3640 Diag(NewTD->getLocation(), diag::err_array_too_large) 3641 << Oversized.toString(10); 3642 else 3643 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3644 NewTD->setInvalidDecl(); 3645 } 3646 } 3647 } 3648} 3649 3650 3651/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3652/// declares a typedef-name, either using the 'typedef' type specifier or via 3653/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3654NamedDecl* 3655Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3656 LookupResult &Previous, bool &Redeclaration) { 3657 // Merge the decl with the existing one if appropriate. If the decl is 3658 // in an outer scope, it isn't the same thing. 3659 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3660 /*ExplicitInstantiationOrSpecialization=*/false); 3661 if (!Previous.empty()) { 3662 Redeclaration = true; 3663 MergeTypedefNameDecl(NewTD, Previous); 3664 } 3665 3666 // If this is the C FILE type, notify the AST context. 3667 if (IdentifierInfo *II = NewTD->getIdentifier()) 3668 if (!NewTD->isInvalidDecl() && 3669 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3670 if (II->isStr("FILE")) 3671 Context.setFILEDecl(NewTD); 3672 else if (II->isStr("jmp_buf")) 3673 Context.setjmp_bufDecl(NewTD); 3674 else if (II->isStr("sigjmp_buf")) 3675 Context.setsigjmp_bufDecl(NewTD); 3676 else if (II->isStr("ucontext_t")) 3677 Context.setucontext_tDecl(NewTD); 3678 else if (II->isStr("__builtin_va_list")) 3679 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3680 } 3681 3682 return NewTD; 3683} 3684 3685/// \brief Determines whether the given declaration is an out-of-scope 3686/// previous declaration. 3687/// 3688/// This routine should be invoked when name lookup has found a 3689/// previous declaration (PrevDecl) that is not in the scope where a 3690/// new declaration by the same name is being introduced. If the new 3691/// declaration occurs in a local scope, previous declarations with 3692/// linkage may still be considered previous declarations (C99 3693/// 6.2.2p4-5, C++ [basic.link]p6). 3694/// 3695/// \param PrevDecl the previous declaration found by name 3696/// lookup 3697/// 3698/// \param DC the context in which the new declaration is being 3699/// declared. 3700/// 3701/// \returns true if PrevDecl is an out-of-scope previous declaration 3702/// for a new delcaration with the same name. 3703static bool 3704isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3705 ASTContext &Context) { 3706 if (!PrevDecl) 3707 return false; 3708 3709 if (!PrevDecl->hasLinkage()) 3710 return false; 3711 3712 if (Context.getLangOptions().CPlusPlus) { 3713 // C++ [basic.link]p6: 3714 // If there is a visible declaration of an entity with linkage 3715 // having the same name and type, ignoring entities declared 3716 // outside the innermost enclosing namespace scope, the block 3717 // scope declaration declares that same entity and receives the 3718 // linkage of the previous declaration. 3719 DeclContext *OuterContext = DC->getRedeclContext(); 3720 if (!OuterContext->isFunctionOrMethod()) 3721 // This rule only applies to block-scope declarations. 3722 return false; 3723 3724 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3725 if (PrevOuterContext->isRecord()) 3726 // We found a member function: ignore it. 3727 return false; 3728 3729 // Find the innermost enclosing namespace for the new and 3730 // previous declarations. 3731 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3732 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3733 3734 // The previous declaration is in a different namespace, so it 3735 // isn't the same function. 3736 if (!OuterContext->Equals(PrevOuterContext)) 3737 return false; 3738 } 3739 3740 return true; 3741} 3742 3743static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3744 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3745 if (!SS.isSet()) return; 3746 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3747} 3748 3749bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3750 QualType type = decl->getType(); 3751 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3752 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3753 // Various kinds of declaration aren't allowed to be __autoreleasing. 3754 unsigned kind = -1U; 3755 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3756 if (var->hasAttr<BlocksAttr>()) 3757 kind = 0; // __block 3758 else if (!var->hasLocalStorage()) 3759 kind = 1; // global 3760 } else if (isa<ObjCIvarDecl>(decl)) { 3761 kind = 3; // ivar 3762 } else if (isa<FieldDecl>(decl)) { 3763 kind = 2; // field 3764 } 3765 3766 if (kind != -1U) { 3767 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3768 << kind; 3769 } 3770 } else if (lifetime == Qualifiers::OCL_None) { 3771 // Try to infer lifetime. 3772 if (!type->isObjCLifetimeType()) 3773 return false; 3774 3775 lifetime = type->getObjCARCImplicitLifetime(); 3776 type = Context.getLifetimeQualifiedType(type, lifetime); 3777 decl->setType(type); 3778 } 3779 3780 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3781 // Thread-local variables cannot have lifetime. 3782 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3783 var->isThreadSpecified()) { 3784 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3785 << var->getType(); 3786 return true; 3787 } 3788 } 3789 3790 return false; 3791} 3792 3793NamedDecl* 3794Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3795 TypeSourceInfo *TInfo, LookupResult &Previous, 3796 MultiTemplateParamsArg TemplateParamLists) { 3797 QualType R = TInfo->getType(); 3798 DeclarationName Name = GetNameForDeclarator(D).getName(); 3799 3800 // Check that there are no default arguments (C++ only). 3801 if (getLangOptions().CPlusPlus) 3802 CheckExtraCXXDefaultArguments(D); 3803 3804 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3805 assert(SCSpec != DeclSpec::SCS_typedef && 3806 "Parser allowed 'typedef' as storage class VarDecl."); 3807 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3808 if (SCSpec == DeclSpec::SCS_mutable) { 3809 // mutable can only appear on non-static class members, so it's always 3810 // an error here 3811 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3812 D.setInvalidType(); 3813 SC = SC_None; 3814 } 3815 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3816 VarDecl::StorageClass SCAsWritten 3817 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3818 3819 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3820 if (!II) { 3821 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3822 << Name; 3823 return 0; 3824 } 3825 3826 DiagnoseFunctionSpecifiers(D); 3827 3828 if (!DC->isRecord() && S->getFnParent() == 0) { 3829 // C99 6.9p2: The storage-class specifiers auto and register shall not 3830 // appear in the declaration specifiers in an external declaration. 3831 if (SC == SC_Auto || SC == SC_Register) { 3832 3833 // If this is a register variable with an asm label specified, then this 3834 // is a GNU extension. 3835 if (SC == SC_Register && D.getAsmLabel()) 3836 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3837 else 3838 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3839 D.setInvalidType(); 3840 } 3841 } 3842 3843 if (getLangOptions().OpenCL) { 3844 // Set up the special work-group-local storage class for variables in the 3845 // OpenCL __local address space. 3846 if (R.getAddressSpace() == LangAS::opencl_local) 3847 SC = SC_OpenCLWorkGroupLocal; 3848 } 3849 3850 bool isExplicitSpecialization = false; 3851 VarDecl *NewVD; 3852 if (!getLangOptions().CPlusPlus) { 3853 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3854 D.getIdentifierLoc(), II, 3855 R, TInfo, SC, SCAsWritten); 3856 3857 if (D.isInvalidType()) 3858 NewVD->setInvalidDecl(); 3859 } else { 3860 if (DC->isRecord() && !CurContext->isRecord()) { 3861 // This is an out-of-line definition of a static data member. 3862 if (SC == SC_Static) { 3863 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3864 diag::err_static_out_of_line) 3865 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3866 } else if (SC == SC_None) 3867 SC = SC_Static; 3868 } 3869 if (SC == SC_Static) { 3870 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3871 if (RD->isLocalClass()) 3872 Diag(D.getIdentifierLoc(), 3873 diag::err_static_data_member_not_allowed_in_local_class) 3874 << Name << RD->getDeclName(); 3875 3876 // C++ [class.union]p1: If a union contains a static data member, 3877 // the program is ill-formed. 3878 // 3879 // We also disallow static data members in anonymous structs. 3880 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3881 Diag(D.getIdentifierLoc(), 3882 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3883 << Name << RD->isUnion(); 3884 } 3885 } 3886 3887 // Match up the template parameter lists with the scope specifier, then 3888 // determine whether we have a template or a template specialization. 3889 isExplicitSpecialization = false; 3890 bool Invalid = false; 3891 if (TemplateParameterList *TemplateParams 3892 = MatchTemplateParametersToScopeSpecifier( 3893 D.getDeclSpec().getSourceRange().getBegin(), 3894 D.getIdentifierLoc(), 3895 D.getCXXScopeSpec(), 3896 TemplateParamLists.get(), 3897 TemplateParamLists.size(), 3898 /*never a friend*/ false, 3899 isExplicitSpecialization, 3900 Invalid)) { 3901 if (TemplateParams->size() > 0) { 3902 // There is no such thing as a variable template. 3903 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3904 << II 3905 << SourceRange(TemplateParams->getTemplateLoc(), 3906 TemplateParams->getRAngleLoc()); 3907 return 0; 3908 } else { 3909 // There is an extraneous 'template<>' for this variable. Complain 3910 // about it, but allow the declaration of the variable. 3911 Diag(TemplateParams->getTemplateLoc(), 3912 diag::err_template_variable_noparams) 3913 << II 3914 << SourceRange(TemplateParams->getTemplateLoc(), 3915 TemplateParams->getRAngleLoc()); 3916 } 3917 } 3918 3919 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3920 D.getIdentifierLoc(), II, 3921 R, TInfo, SC, SCAsWritten); 3922 3923 // If this decl has an auto type in need of deduction, make a note of the 3924 // Decl so we can diagnose uses of it in its own initializer. 3925 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3926 R->getContainedAutoType()) 3927 ParsingInitForAutoVars.insert(NewVD); 3928 3929 if (D.isInvalidType() || Invalid) 3930 NewVD->setInvalidDecl(); 3931 3932 SetNestedNameSpecifier(NewVD, D); 3933 3934 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3935 NewVD->setTemplateParameterListsInfo(Context, 3936 TemplateParamLists.size(), 3937 TemplateParamLists.release()); 3938 } 3939 3940 if (D.getDeclSpec().isConstexprSpecified()) { 3941 // FIXME: once we know whether there's an initializer, apply this to 3942 // static data members too. 3943 if (!NewVD->isStaticDataMember() && 3944 !NewVD->isThisDeclarationADefinition()) { 3945 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3946 // of a variable. Suggest replacing it with 'const' if appropriate. 3947 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3948 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3949 // If the declarator is complex, we need to move the keyword to the 3950 // innermost chunk as we switch it from 'constexpr' to 'const'. 3951 int Kind = DeclaratorChunk::Paren; 3952 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3953 Kind = D.getTypeObject(I).Kind; 3954 if (Kind != DeclaratorChunk::Paren) 3955 break; 3956 } 3957 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3958 Kind == DeclaratorChunk::Reference) 3959 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3960 << FixItHint::CreateRemoval(ConstexprRange); 3961 else if (Kind == DeclaratorChunk::Paren) 3962 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3963 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3964 else 3965 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3966 << FixItHint::CreateRemoval(ConstexprRange) 3967 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3968 } else { 3969 NewVD->setConstexpr(true); 3970 } 3971 } 3972 } 3973 3974 // Set the lexical context. If the declarator has a C++ scope specifier, the 3975 // lexical context will be different from the semantic context. 3976 NewVD->setLexicalDeclContext(CurContext); 3977 3978 if (D.getDeclSpec().isThreadSpecified()) { 3979 if (NewVD->hasLocalStorage()) 3980 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3981 else if (!Context.getTargetInfo().isTLSSupported()) 3982 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3983 else 3984 NewVD->setThreadSpecified(true); 3985 } 3986 3987 if (D.getDeclSpec().isModulePrivateSpecified()) { 3988 if (isExplicitSpecialization) 3989 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3990 << 2 3991 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3992 else if (NewVD->hasLocalStorage()) 3993 Diag(NewVD->getLocation(), diag::err_module_private_local) 3994 << 0 << NewVD->getDeclName() 3995 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3996 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3997 else 3998 NewVD->setModulePrivate(); 3999 } 4000 4001 // Handle attributes prior to checking for duplicates in MergeVarDecl 4002 ProcessDeclAttributes(S, NewVD, D); 4003 4004 // In auto-retain/release, infer strong retension for variables of 4005 // retainable type. 4006 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4007 NewVD->setInvalidDecl(); 4008 4009 // Handle GNU asm-label extension (encoded as an attribute). 4010 if (Expr *E = (Expr*)D.getAsmLabel()) { 4011 // The parser guarantees this is a string. 4012 StringLiteral *SE = cast<StringLiteral>(E); 4013 StringRef Label = SE->getString(); 4014 if (S->getFnParent() != 0) { 4015 switch (SC) { 4016 case SC_None: 4017 case SC_Auto: 4018 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4019 break; 4020 case SC_Register: 4021 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4022 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4023 break; 4024 case SC_Static: 4025 case SC_Extern: 4026 case SC_PrivateExtern: 4027 case SC_OpenCLWorkGroupLocal: 4028 break; 4029 } 4030 } 4031 4032 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4033 Context, Label)); 4034 } 4035 4036 // Diagnose shadowed variables before filtering for scope. 4037 if (!D.getCXXScopeSpec().isSet()) 4038 CheckShadow(S, NewVD, Previous); 4039 4040 // Don't consider existing declarations that are in a different 4041 // scope and are out-of-semantic-context declarations (if the new 4042 // declaration has linkage). 4043 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4044 isExplicitSpecialization); 4045 4046 if (!getLangOptions().CPlusPlus) { 4047 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4048 } else { 4049 // Merge the decl with the existing one if appropriate. 4050 if (!Previous.empty()) { 4051 if (Previous.isSingleResult() && 4052 isa<FieldDecl>(Previous.getFoundDecl()) && 4053 D.getCXXScopeSpec().isSet()) { 4054 // The user tried to define a non-static data member 4055 // out-of-line (C++ [dcl.meaning]p1). 4056 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4057 << D.getCXXScopeSpec().getRange(); 4058 Previous.clear(); 4059 NewVD->setInvalidDecl(); 4060 } 4061 } else if (D.getCXXScopeSpec().isSet()) { 4062 // No previous declaration in the qualifying scope. 4063 Diag(D.getIdentifierLoc(), diag::err_no_member) 4064 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4065 << D.getCXXScopeSpec().getRange(); 4066 NewVD->setInvalidDecl(); 4067 } 4068 4069 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4070 4071 // This is an explicit specialization of a static data member. Check it. 4072 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4073 CheckMemberSpecialization(NewVD, Previous)) 4074 NewVD->setInvalidDecl(); 4075 } 4076 4077 // attributes declared post-definition are currently ignored 4078 // FIXME: This should be handled in attribute merging, not 4079 // here. 4080 if (Previous.isSingleResult()) { 4081 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4082 if (Def && (Def = Def->getDefinition()) && 4083 Def != NewVD && D.hasAttributes()) { 4084 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4085 Diag(Def->getLocation(), diag::note_previous_definition); 4086 } 4087 } 4088 4089 // If this is a locally-scoped extern C variable, update the map of 4090 // such variables. 4091 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4092 !NewVD->isInvalidDecl()) 4093 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4094 4095 // If there's a #pragma GCC visibility in scope, and this isn't a class 4096 // member, set the visibility of this variable. 4097 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4098 AddPushedVisibilityAttribute(NewVD); 4099 4100 MarkUnusedFileScopedDecl(NewVD); 4101 4102 return NewVD; 4103} 4104 4105/// \brief Diagnose variable or built-in function shadowing. Implements 4106/// -Wshadow. 4107/// 4108/// This method is called whenever a VarDecl is added to a "useful" 4109/// scope. 4110/// 4111/// \param S the scope in which the shadowing name is being declared 4112/// \param R the lookup of the name 4113/// 4114void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4115 // Return if warning is ignored. 4116 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4117 DiagnosticsEngine::Ignored) 4118 return; 4119 4120 // Don't diagnose declarations at file scope. 4121 if (D->hasGlobalStorage()) 4122 return; 4123 4124 DeclContext *NewDC = D->getDeclContext(); 4125 4126 // Only diagnose if we're shadowing an unambiguous field or variable. 4127 if (R.getResultKind() != LookupResult::Found) 4128 return; 4129 4130 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4131 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4132 return; 4133 4134 // Fields are not shadowed by variables in C++ static methods. 4135 if (isa<FieldDecl>(ShadowedDecl)) 4136 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4137 if (MD->isStatic()) 4138 return; 4139 4140 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4141 if (shadowedVar->isExternC()) { 4142 // For shadowing external vars, make sure that we point to the global 4143 // declaration, not a locally scoped extern declaration. 4144 for (VarDecl::redecl_iterator 4145 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4146 I != E; ++I) 4147 if (I->isFileVarDecl()) { 4148 ShadowedDecl = *I; 4149 break; 4150 } 4151 } 4152 4153 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4154 4155 // Only warn about certain kinds of shadowing for class members. 4156 if (NewDC && NewDC->isRecord()) { 4157 // In particular, don't warn about shadowing non-class members. 4158 if (!OldDC->isRecord()) 4159 return; 4160 4161 // TODO: should we warn about static data members shadowing 4162 // static data members from base classes? 4163 4164 // TODO: don't diagnose for inaccessible shadowed members. 4165 // This is hard to do perfectly because we might friend the 4166 // shadowing context, but that's just a false negative. 4167 } 4168 4169 // Determine what kind of declaration we're shadowing. 4170 unsigned Kind; 4171 if (isa<RecordDecl>(OldDC)) { 4172 if (isa<FieldDecl>(ShadowedDecl)) 4173 Kind = 3; // field 4174 else 4175 Kind = 2; // static data member 4176 } else if (OldDC->isFileContext()) 4177 Kind = 1; // global 4178 else 4179 Kind = 0; // local 4180 4181 DeclarationName Name = R.getLookupName(); 4182 4183 // Emit warning and note. 4184 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4185 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4186} 4187 4188/// \brief Check -Wshadow without the advantage of a previous lookup. 4189void Sema::CheckShadow(Scope *S, VarDecl *D) { 4190 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4191 DiagnosticsEngine::Ignored) 4192 return; 4193 4194 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4195 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4196 LookupName(R, S); 4197 CheckShadow(S, D, R); 4198} 4199 4200/// \brief Perform semantic checking on a newly-created variable 4201/// declaration. 4202/// 4203/// This routine performs all of the type-checking required for a 4204/// variable declaration once it has been built. It is used both to 4205/// check variables after they have been parsed and their declarators 4206/// have been translated into a declaration, and to check variables 4207/// that have been instantiated from a template. 4208/// 4209/// Sets NewVD->isInvalidDecl() if an error was encountered. 4210/// 4211/// Returns true if the variable declaration is a redeclaration. 4212bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4213 LookupResult &Previous) { 4214 // If the decl is already known invalid, don't check it. 4215 if (NewVD->isInvalidDecl()) 4216 return false; 4217 4218 QualType T = NewVD->getType(); 4219 4220 if (T->isObjCObjectType()) { 4221 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4222 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4223 T = Context.getObjCObjectPointerType(T); 4224 NewVD->setType(T); 4225 } 4226 4227 // Emit an error if an address space was applied to decl with local storage. 4228 // This includes arrays of objects with address space qualifiers, but not 4229 // automatic variables that point to other address spaces. 4230 // ISO/IEC TR 18037 S5.1.2 4231 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4232 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4233 NewVD->setInvalidDecl(); 4234 return false; 4235 } 4236 4237 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4238 && !NewVD->hasAttr<BlocksAttr>()) { 4239 if (getLangOptions().getGC() != LangOptions::NonGC) 4240 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4241 else 4242 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4243 } 4244 4245 bool isVM = T->isVariablyModifiedType(); 4246 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4247 NewVD->hasAttr<BlocksAttr>()) 4248 getCurFunction()->setHasBranchProtectedScope(); 4249 4250 if ((isVM && NewVD->hasLinkage()) || 4251 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4252 bool SizeIsNegative; 4253 llvm::APSInt Oversized; 4254 QualType FixedTy = 4255 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4256 Oversized); 4257 4258 if (FixedTy.isNull() && T->isVariableArrayType()) { 4259 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4260 // FIXME: This won't give the correct result for 4261 // int a[10][n]; 4262 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4263 4264 if (NewVD->isFileVarDecl()) 4265 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4266 << SizeRange; 4267 else if (NewVD->getStorageClass() == SC_Static) 4268 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4269 << SizeRange; 4270 else 4271 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4272 << SizeRange; 4273 NewVD->setInvalidDecl(); 4274 return false; 4275 } 4276 4277 if (FixedTy.isNull()) { 4278 if (NewVD->isFileVarDecl()) 4279 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4280 else 4281 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4282 NewVD->setInvalidDecl(); 4283 return false; 4284 } 4285 4286 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4287 NewVD->setType(FixedTy); 4288 } 4289 4290 if (Previous.empty() && NewVD->isExternC()) { 4291 // Since we did not find anything by this name and we're declaring 4292 // an extern "C" variable, look for a non-visible extern "C" 4293 // declaration with the same name. 4294 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4295 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4296 if (Pos != LocallyScopedExternalDecls.end()) 4297 Previous.addDecl(Pos->second); 4298 } 4299 4300 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4301 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4302 << T; 4303 NewVD->setInvalidDecl(); 4304 return false; 4305 } 4306 4307 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4308 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4309 NewVD->setInvalidDecl(); 4310 return false; 4311 } 4312 4313 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4314 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4315 NewVD->setInvalidDecl(); 4316 return false; 4317 } 4318 4319 // Function pointers and references cannot have qualified function type, only 4320 // function pointer-to-members can do that. 4321 QualType Pointee; 4322 unsigned PtrOrRef = 0; 4323 if (const PointerType *Ptr = T->getAs<PointerType>()) 4324 Pointee = Ptr->getPointeeType(); 4325 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4326 Pointee = Ref->getPointeeType(); 4327 PtrOrRef = 1; 4328 } 4329 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4330 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4331 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4332 << PtrOrRef; 4333 NewVD->setInvalidDecl(); 4334 return false; 4335 } 4336 4337 if (!Previous.empty()) { 4338 MergeVarDecl(NewVD, Previous); 4339 return true; 4340 } 4341 return false; 4342} 4343 4344/// \brief Data used with FindOverriddenMethod 4345struct FindOverriddenMethodData { 4346 Sema *S; 4347 CXXMethodDecl *Method; 4348}; 4349 4350/// \brief Member lookup function that determines whether a given C++ 4351/// method overrides a method in a base class, to be used with 4352/// CXXRecordDecl::lookupInBases(). 4353static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4354 CXXBasePath &Path, 4355 void *UserData) { 4356 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4357 4358 FindOverriddenMethodData *Data 4359 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4360 4361 DeclarationName Name = Data->Method->getDeclName(); 4362 4363 // FIXME: Do we care about other names here too? 4364 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4365 // We really want to find the base class destructor here. 4366 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4367 CanQualType CT = Data->S->Context.getCanonicalType(T); 4368 4369 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4370 } 4371 4372 for (Path.Decls = BaseRecord->lookup(Name); 4373 Path.Decls.first != Path.Decls.second; 4374 ++Path.Decls.first) { 4375 NamedDecl *D = *Path.Decls.first; 4376 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4377 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4378 return true; 4379 } 4380 } 4381 4382 return false; 4383} 4384 4385/// AddOverriddenMethods - See if a method overrides any in the base classes, 4386/// and if so, check that it's a valid override and remember it. 4387bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4388 // Look for virtual methods in base classes that this method might override. 4389 CXXBasePaths Paths; 4390 FindOverriddenMethodData Data; 4391 Data.Method = MD; 4392 Data.S = this; 4393 bool AddedAny = false; 4394 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4395 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4396 E = Paths.found_decls_end(); I != E; ++I) { 4397 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4398 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4399 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4400 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4401 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4402 AddedAny = true; 4403 } 4404 } 4405 } 4406 } 4407 4408 return AddedAny; 4409} 4410 4411namespace { 4412 // Struct for holding all of the extra arguments needed by 4413 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4414 struct ActOnFDArgs { 4415 Scope *S; 4416 Declarator &D; 4417 MultiTemplateParamsArg TemplateParamLists; 4418 bool AddToScope; 4419 }; 4420} 4421 4422/// \brief Generate diagnostics for an invalid function redeclaration. 4423/// 4424/// This routine handles generating the diagnostic messages for an invalid 4425/// function redeclaration, including finding possible similar declarations 4426/// or performing typo correction if there are no previous declarations with 4427/// the same name. 4428/// 4429/// Returns a NamedDecl iff typo correction was performed and substituting in 4430/// the new declaration name does not cause new errors. 4431static NamedDecl* DiagnoseInvalidRedeclaration( 4432 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4433 ActOnFDArgs &ExtraArgs) { 4434 NamedDecl *Result = NULL; 4435 DeclarationName Name = NewFD->getDeclName(); 4436 DeclContext *NewDC = NewFD->getDeclContext(); 4437 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4438 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4439 llvm::SmallVector<unsigned, 1> MismatchedParams; 4440 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4441 TypoCorrection Correction; 4442 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4443 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4444 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4445 : diag::err_member_def_does_not_match; 4446 4447 NewFD->setInvalidDecl(); 4448 SemaRef.LookupQualifiedName(Prev, NewDC); 4449 assert(!Prev.isAmbiguous() && 4450 "Cannot have an ambiguity in previous-declaration lookup"); 4451 if (!Prev.empty()) { 4452 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4453 Func != FuncEnd; ++Func) { 4454 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4455 if (FD && 4456 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4457 // Add 1 to the index so that 0 can mean the mismatch didn't 4458 // involve a parameter 4459 unsigned ParamNum = 4460 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4461 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4462 } 4463 } 4464 // If the qualified name lookup yielded nothing, try typo correction 4465 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4466 Prev.getLookupKind(), 0, 0, NewDC)) && 4467 Correction.getCorrection() != Name) { 4468 // Trap errors. 4469 Sema::SFINAETrap Trap(SemaRef); 4470 4471 // Set up everything for the call to ActOnFunctionDeclarator 4472 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4473 ExtraArgs.D.getIdentifierLoc()); 4474 Previous.clear(); 4475 Previous.setLookupName(Correction.getCorrection()); 4476 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4477 CDeclEnd = Correction.end(); 4478 CDecl != CDeclEnd; ++CDecl) { 4479 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4480 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4481 MismatchedParams)) { 4482 Previous.addDecl(FD); 4483 } 4484 } 4485 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4486 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4487 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4488 // eliminate the need for the parameter pack ExtraArgs. 4489 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4490 NewFD->getDeclContext(), 4491 NewFD->getTypeSourceInfo(), 4492 Previous, 4493 ExtraArgs.TemplateParamLists, 4494 ExtraArgs.AddToScope); 4495 if (Trap.hasErrorOccurred()) { 4496 // Pretend the typo correction never occurred 4497 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4498 ExtraArgs.D.getIdentifierLoc()); 4499 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4500 Previous.clear(); 4501 Previous.setLookupName(Name); 4502 Result = NULL; 4503 } else { 4504 for (LookupResult::iterator Func = Previous.begin(), 4505 FuncEnd = Previous.end(); 4506 Func != FuncEnd; ++Func) { 4507 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4508 NearMatches.push_back(std::make_pair(FD, 0)); 4509 } 4510 } 4511 if (NearMatches.empty()) { 4512 // Ignore the correction if it didn't yield any close FunctionDecl matches 4513 Correction = TypoCorrection(); 4514 } else { 4515 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4516 : diag::err_member_def_does_not_match_suggest; 4517 } 4518 } 4519 4520 if (Correction) 4521 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4522 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4523 << FixItHint::CreateReplacement( 4524 NewFD->getLocation(), 4525 Correction.getAsString(SemaRef.getLangOptions())); 4526 else 4527 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4528 << Name << NewDC << NewFD->getLocation(); 4529 4530 bool NewFDisConst = false; 4531 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4532 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4533 4534 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4535 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4536 NearMatch != NearMatchEnd; ++NearMatch) { 4537 FunctionDecl *FD = NearMatch->first; 4538 bool FDisConst = false; 4539 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4540 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4541 4542 if (unsigned Idx = NearMatch->second) { 4543 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4544 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4545 diag::note_member_def_close_param_match) 4546 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4547 } else if (Correction) { 4548 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4549 << Correction.getQuoted(SemaRef.getLangOptions()); 4550 } else if (FDisConst != NewFDisConst) { 4551 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4552 << NewFDisConst << FD->getSourceRange().getEnd(); 4553 } else 4554 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4555 } 4556 return Result; 4557} 4558 4559static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4560 Declarator &D) { 4561 switch (D.getDeclSpec().getStorageClassSpec()) { 4562 default: llvm_unreachable("Unknown storage class!"); 4563 case DeclSpec::SCS_auto: 4564 case DeclSpec::SCS_register: 4565 case DeclSpec::SCS_mutable: 4566 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4567 diag::err_typecheck_sclass_func); 4568 D.setInvalidType(); 4569 break; 4570 case DeclSpec::SCS_unspecified: break; 4571 case DeclSpec::SCS_extern: return SC_Extern; 4572 case DeclSpec::SCS_static: { 4573 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4574 // C99 6.7.1p5: 4575 // The declaration of an identifier for a function that has 4576 // block scope shall have no explicit storage-class specifier 4577 // other than extern 4578 // See also (C++ [dcl.stc]p4). 4579 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4580 diag::err_static_block_func); 4581 break; 4582 } else 4583 return SC_Static; 4584 } 4585 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4586 } 4587 4588 // No explicit storage class has already been returned 4589 return SC_None; 4590} 4591 4592static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4593 DeclContext *DC, QualType &R, 4594 TypeSourceInfo *TInfo, 4595 FunctionDecl::StorageClass SC, 4596 bool &IsVirtualOkay) { 4597 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4598 DeclarationName Name = NameInfo.getName(); 4599 4600 FunctionDecl *NewFD = 0; 4601 bool isInline = D.getDeclSpec().isInlineSpecified(); 4602 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4603 FunctionDecl::StorageClass SCAsWritten 4604 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4605 4606 if (!SemaRef.getLangOptions().CPlusPlus) { 4607 // Determine whether the function was written with a 4608 // prototype. This true when: 4609 // - there is a prototype in the declarator, or 4610 // - the type R of the function is some kind of typedef or other reference 4611 // to a type name (which eventually refers to a function type). 4612 bool HasPrototype = 4613 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4614 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4615 4616 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4617 D.getSourceRange().getBegin(), NameInfo, R, 4618 TInfo, SC, SCAsWritten, isInline, 4619 HasPrototype); 4620 if (D.isInvalidType()) 4621 NewFD->setInvalidDecl(); 4622 4623 // Set the lexical context. 4624 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4625 4626 return NewFD; 4627 } 4628 4629 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4630 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4631 4632 // Check that the return type is not an abstract class type. 4633 // For record types, this is done by the AbstractClassUsageDiagnoser once 4634 // the class has been completely parsed. 4635 if (!DC->isRecord() && 4636 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4637 R->getAs<FunctionType>()->getResultType(), 4638 diag::err_abstract_type_in_decl, 4639 SemaRef.AbstractReturnType)) 4640 D.setInvalidType(); 4641 4642 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4643 // This is a C++ constructor declaration. 4644 assert(DC->isRecord() && 4645 "Constructors can only be declared in a member context"); 4646 4647 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4648 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4649 D.getSourceRange().getBegin(), NameInfo, 4650 R, TInfo, isExplicit, isInline, 4651 /*isImplicitlyDeclared=*/false, 4652 isConstexpr); 4653 4654 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4655 // This is a C++ destructor declaration. 4656 if (DC->isRecord()) { 4657 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4658 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4659 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4660 SemaRef.Context, Record, 4661 D.getSourceRange().getBegin(), 4662 NameInfo, R, TInfo, isInline, 4663 /*isImplicitlyDeclared=*/false); 4664 4665 // If the class is complete, then we now create the implicit exception 4666 // specification. If the class is incomplete or dependent, we can't do 4667 // it yet. 4668 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4669 Record->getDefinition() && !Record->isBeingDefined() && 4670 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4671 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4672 } 4673 4674 IsVirtualOkay = true; 4675 return NewDD; 4676 4677 } else { 4678 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4679 D.setInvalidType(); 4680 4681 // Create a FunctionDecl to satisfy the function definition parsing 4682 // code path. 4683 return FunctionDecl::Create(SemaRef.Context, DC, 4684 D.getSourceRange().getBegin(), 4685 D.getIdentifierLoc(), Name, R, TInfo, 4686 SC, SCAsWritten, isInline, 4687 /*hasPrototype=*/true, isConstexpr); 4688 } 4689 4690 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4691 if (!DC->isRecord()) { 4692 SemaRef.Diag(D.getIdentifierLoc(), 4693 diag::err_conv_function_not_member); 4694 return 0; 4695 } 4696 4697 SemaRef.CheckConversionDeclarator(D, R, SC); 4698 IsVirtualOkay = true; 4699 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4700 D.getSourceRange().getBegin(), NameInfo, 4701 R, TInfo, isInline, isExplicit, 4702 isConstexpr, SourceLocation()); 4703 4704 } else if (DC->isRecord()) { 4705 // If the name of the function is the same as the name of the record, 4706 // then this must be an invalid constructor that has a return type. 4707 // (The parser checks for a return type and makes the declarator a 4708 // constructor if it has no return type). 4709 if (Name.getAsIdentifierInfo() && 4710 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4711 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4712 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4713 << SourceRange(D.getIdentifierLoc()); 4714 return 0; 4715 } 4716 4717 bool isStatic = SC == SC_Static; 4718 4719 // [class.free]p1: 4720 // Any allocation function for a class T is a static member 4721 // (even if not explicitly declared static). 4722 if (Name.getCXXOverloadedOperator() == OO_New || 4723 Name.getCXXOverloadedOperator() == OO_Array_New) 4724 isStatic = true; 4725 4726 // [class.free]p6 Any deallocation function for a class X is a static member 4727 // (even if not explicitly declared static). 4728 if (Name.getCXXOverloadedOperator() == OO_Delete || 4729 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4730 isStatic = true; 4731 4732 IsVirtualOkay = !isStatic; 4733 4734 // This is a C++ method declaration. 4735 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4736 D.getSourceRange().getBegin(), NameInfo, R, 4737 TInfo, isStatic, SCAsWritten, isInline, 4738 isConstexpr, SourceLocation()); 4739 4740 } else { 4741 // Determine whether the function was written with a 4742 // prototype. This true when: 4743 // - we're in C++ (where every function has a prototype), 4744 return FunctionDecl::Create(SemaRef.Context, DC, 4745 D.getSourceRange().getBegin(), 4746 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4747 true/*HasPrototype*/, isConstexpr); 4748 } 4749} 4750 4751NamedDecl* 4752Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4753 TypeSourceInfo *TInfo, LookupResult &Previous, 4754 MultiTemplateParamsArg TemplateParamLists, 4755 bool &AddToScope) { 4756 QualType R = TInfo->getType(); 4757 4758 assert(R.getTypePtr()->isFunctionType()); 4759 4760 // TODO: consider using NameInfo for diagnostic. 4761 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4762 DeclarationName Name = NameInfo.getName(); 4763 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4764 4765 if (D.getDeclSpec().isThreadSpecified()) 4766 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4767 4768 // Do not allow returning a objc interface by-value. 4769 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4770 Diag(D.getIdentifierLoc(), 4771 diag::err_object_cannot_be_passed_returned_by_value) << 0 4772 << R->getAs<FunctionType>()->getResultType() 4773 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4774 4775 QualType T = R->getAs<FunctionType>()->getResultType(); 4776 T = Context.getObjCObjectPointerType(T); 4777 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4778 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4779 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4780 FPT->getNumArgs(), EPI); 4781 } 4782 else if (isa<FunctionNoProtoType>(R)) 4783 R = Context.getFunctionNoProtoType(T); 4784 } 4785 4786 bool isFriend = false; 4787 FunctionTemplateDecl *FunctionTemplate = 0; 4788 bool isExplicitSpecialization = false; 4789 bool isFunctionTemplateSpecialization = false; 4790 bool isDependentClassScopeExplicitSpecialization = false; 4791 bool isVirtualOkay = false; 4792 4793 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4794 isVirtualOkay); 4795 if (!NewFD) return 0; 4796 4797 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4798 NewFD->setTopLevelDeclInObjCContainer(); 4799 4800 if (getLangOptions().CPlusPlus) { 4801 bool isInline = D.getDeclSpec().isInlineSpecified(); 4802 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4803 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4804 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4805 isFriend = D.getDeclSpec().isFriendSpecified(); 4806 if (isFriend && !isInline && D.isFunctionDefinition()) { 4807 // C++ [class.friend]p5 4808 // A function can be defined in a friend declaration of a 4809 // class . . . . Such a function is implicitly inline. 4810 NewFD->setImplicitlyInline(); 4811 } 4812 4813 SetNestedNameSpecifier(NewFD, D); 4814 isExplicitSpecialization = false; 4815 isFunctionTemplateSpecialization = false; 4816 if (D.isInvalidType()) 4817 NewFD->setInvalidDecl(); 4818 4819 // Set the lexical context. If the declarator has a C++ 4820 // scope specifier, or is the object of a friend declaration, the 4821 // lexical context will be different from the semantic context. 4822 NewFD->setLexicalDeclContext(CurContext); 4823 4824 // Match up the template parameter lists with the scope specifier, then 4825 // determine whether we have a template or a template specialization. 4826 bool Invalid = false; 4827 if (TemplateParameterList *TemplateParams 4828 = MatchTemplateParametersToScopeSpecifier( 4829 D.getDeclSpec().getSourceRange().getBegin(), 4830 D.getIdentifierLoc(), 4831 D.getCXXScopeSpec(), 4832 TemplateParamLists.get(), 4833 TemplateParamLists.size(), 4834 isFriend, 4835 isExplicitSpecialization, 4836 Invalid)) { 4837 if (TemplateParams->size() > 0) { 4838 // This is a function template 4839 4840 // Check that we can declare a template here. 4841 if (CheckTemplateDeclScope(S, TemplateParams)) 4842 return 0; 4843 4844 // A destructor cannot be a template. 4845 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4846 Diag(NewFD->getLocation(), diag::err_destructor_template); 4847 return 0; 4848 } 4849 4850 // If we're adding a template to a dependent context, we may need to 4851 // rebuilding some of the types used within the template parameter list, 4852 // now that we know what the current instantiation is. 4853 if (DC->isDependentContext()) { 4854 ContextRAII SavedContext(*this, DC); 4855 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4856 Invalid = true; 4857 } 4858 4859 4860 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4861 NewFD->getLocation(), 4862 Name, TemplateParams, 4863 NewFD); 4864 FunctionTemplate->setLexicalDeclContext(CurContext); 4865 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4866 4867 // For source fidelity, store the other template param lists. 4868 if (TemplateParamLists.size() > 1) { 4869 NewFD->setTemplateParameterListsInfo(Context, 4870 TemplateParamLists.size() - 1, 4871 TemplateParamLists.release()); 4872 } 4873 } else { 4874 // This is a function template specialization. 4875 isFunctionTemplateSpecialization = true; 4876 // For source fidelity, store all the template param lists. 4877 NewFD->setTemplateParameterListsInfo(Context, 4878 TemplateParamLists.size(), 4879 TemplateParamLists.release()); 4880 4881 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4882 if (isFriend) { 4883 // We want to remove the "template<>", found here. 4884 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4885 4886 // If we remove the template<> and the name is not a 4887 // template-id, we're actually silently creating a problem: 4888 // the friend declaration will refer to an untemplated decl, 4889 // and clearly the user wants a template specialization. So 4890 // we need to insert '<>' after the name. 4891 SourceLocation InsertLoc; 4892 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4893 InsertLoc = D.getName().getSourceRange().getEnd(); 4894 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4895 } 4896 4897 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4898 << Name << RemoveRange 4899 << FixItHint::CreateRemoval(RemoveRange) 4900 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4901 } 4902 } 4903 } 4904 else { 4905 // All template param lists were matched against the scope specifier: 4906 // this is NOT (an explicit specialization of) a template. 4907 if (TemplateParamLists.size() > 0) 4908 // For source fidelity, store all the template param lists. 4909 NewFD->setTemplateParameterListsInfo(Context, 4910 TemplateParamLists.size(), 4911 TemplateParamLists.release()); 4912 } 4913 4914 if (Invalid) { 4915 NewFD->setInvalidDecl(); 4916 if (FunctionTemplate) 4917 FunctionTemplate->setInvalidDecl(); 4918 } 4919 4920 // C++ [dcl.fct.spec]p5: 4921 // The virtual specifier shall only be used in declarations of 4922 // nonstatic class member functions that appear within a 4923 // member-specification of a class declaration; see 10.3. 4924 // 4925 if (isVirtual && !NewFD->isInvalidDecl()) { 4926 if (!isVirtualOkay) { 4927 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4928 diag::err_virtual_non_function); 4929 } else if (!CurContext->isRecord()) { 4930 // 'virtual' was specified outside of the class. 4931 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4932 diag::err_virtual_out_of_class) 4933 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4934 } else if (NewFD->getDescribedFunctionTemplate()) { 4935 // C++ [temp.mem]p3: 4936 // A member function template shall not be virtual. 4937 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4938 diag::err_virtual_member_function_template) 4939 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4940 } else { 4941 // Okay: Add virtual to the method. 4942 NewFD->setVirtualAsWritten(true); 4943 } 4944 } 4945 4946 // C++ [dcl.fct.spec]p3: 4947 // The inline specifier shall not appear on a block scope function 4948 // declaration. 4949 if (isInline && !NewFD->isInvalidDecl()) { 4950 if (CurContext->isFunctionOrMethod()) { 4951 // 'inline' is not allowed on block scope function declaration. 4952 Diag(D.getDeclSpec().getInlineSpecLoc(), 4953 diag::err_inline_declaration_block_scope) << Name 4954 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4955 } 4956 } 4957 4958 // C++ [dcl.fct.spec]p6: 4959 // The explicit specifier shall be used only in the declaration of a 4960 // constructor or conversion function within its class definition; 4961 // see 12.3.1 and 12.3.2. 4962 if (isExplicit && !NewFD->isInvalidDecl()) { 4963 if (!CurContext->isRecord()) { 4964 // 'explicit' was specified outside of the class. 4965 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4966 diag::err_explicit_out_of_class) 4967 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4968 } else if (!isa<CXXConstructorDecl>(NewFD) && 4969 !isa<CXXConversionDecl>(NewFD)) { 4970 // 'explicit' was specified on a function that wasn't a constructor 4971 // or conversion function. 4972 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4973 diag::err_explicit_non_ctor_or_conv_function) 4974 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4975 } 4976 } 4977 4978 if (isConstexpr) { 4979 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4980 // are implicitly inline. 4981 NewFD->setImplicitlyInline(); 4982 4983 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4984 // be either constructors or to return a literal type. Therefore, 4985 // destructors cannot be declared constexpr. 4986 if (isa<CXXDestructorDecl>(NewFD)) 4987 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4988 } 4989 4990 // If __module_private__ was specified, mark the function accordingly. 4991 if (D.getDeclSpec().isModulePrivateSpecified()) { 4992 if (isFunctionTemplateSpecialization) { 4993 SourceLocation ModulePrivateLoc 4994 = D.getDeclSpec().getModulePrivateSpecLoc(); 4995 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4996 << 0 4997 << FixItHint::CreateRemoval(ModulePrivateLoc); 4998 } else { 4999 NewFD->setModulePrivate(); 5000 if (FunctionTemplate) 5001 FunctionTemplate->setModulePrivate(); 5002 } 5003 } 5004 5005 if (isFriend) { 5006 // For now, claim that the objects have no previous declaration. 5007 if (FunctionTemplate) { 5008 FunctionTemplate->setObjectOfFriendDecl(false); 5009 FunctionTemplate->setAccess(AS_public); 5010 } 5011 NewFD->setObjectOfFriendDecl(false); 5012 NewFD->setAccess(AS_public); 5013 } 5014 5015 // If a function is defined as defaulted or deleted, mark it as such now. 5016 switch (D.getFunctionDefinitionKind()) { 5017 case FDK_Declaration: 5018 case FDK_Definition: 5019 break; 5020 5021 case FDK_Defaulted: 5022 NewFD->setDefaulted(); 5023 break; 5024 5025 case FDK_Deleted: 5026 NewFD->setDeletedAsWritten(); 5027 break; 5028 } 5029 5030 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5031 D.isFunctionDefinition()) { 5032 // C++ [class.mfct]p2: 5033 // A member function may be defined (8.4) in its class definition, in 5034 // which case it is an inline member function (7.1.2) 5035 NewFD->setImplicitlyInline(); 5036 } 5037 5038 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5039 !CurContext->isRecord()) { 5040 // C++ [class.static]p1: 5041 // A data or function member of a class may be declared static 5042 // in a class definition, in which case it is a static member of 5043 // the class. 5044 5045 // Complain about the 'static' specifier if it's on an out-of-line 5046 // member function definition. 5047 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5048 diag::err_static_out_of_line) 5049 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5050 } 5051 } 5052 5053 // Filter out previous declarations that don't match the scope. 5054 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5055 isExplicitSpecialization || 5056 isFunctionTemplateSpecialization); 5057 5058 // Handle GNU asm-label extension (encoded as an attribute). 5059 if (Expr *E = (Expr*) D.getAsmLabel()) { 5060 // The parser guarantees this is a string. 5061 StringLiteral *SE = cast<StringLiteral>(E); 5062 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5063 SE->getString())); 5064 } 5065 5066 // Copy the parameter declarations from the declarator D to the function 5067 // declaration NewFD, if they are available. First scavenge them into Params. 5068 SmallVector<ParmVarDecl*, 16> Params; 5069 if (D.isFunctionDeclarator()) { 5070 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5071 5072 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5073 // function that takes no arguments, not a function that takes a 5074 // single void argument. 5075 // We let through "const void" here because Sema::GetTypeForDeclarator 5076 // already checks for that case. 5077 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5078 FTI.ArgInfo[0].Param && 5079 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5080 // Empty arg list, don't push any params. 5081 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5082 5083 // In C++, the empty parameter-type-list must be spelled "void"; a 5084 // typedef of void is not permitted. 5085 if (getLangOptions().CPlusPlus && 5086 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5087 bool IsTypeAlias = false; 5088 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5089 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5090 else if (const TemplateSpecializationType *TST = 5091 Param->getType()->getAs<TemplateSpecializationType>()) 5092 IsTypeAlias = TST->isTypeAlias(); 5093 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5094 << IsTypeAlias; 5095 } 5096 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5097 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5098 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5099 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5100 Param->setDeclContext(NewFD); 5101 Params.push_back(Param); 5102 5103 if (Param->isInvalidDecl()) 5104 NewFD->setInvalidDecl(); 5105 } 5106 } 5107 5108 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5109 // When we're declaring a function with a typedef, typeof, etc as in the 5110 // following example, we'll need to synthesize (unnamed) 5111 // parameters for use in the declaration. 5112 // 5113 // @code 5114 // typedef void fn(int); 5115 // fn f; 5116 // @endcode 5117 5118 // Synthesize a parameter for each argument type. 5119 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5120 AE = FT->arg_type_end(); AI != AE; ++AI) { 5121 ParmVarDecl *Param = 5122 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5123 Param->setScopeInfo(0, Params.size()); 5124 Params.push_back(Param); 5125 } 5126 } else { 5127 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5128 "Should not need args for typedef of non-prototype fn"); 5129 } 5130 5131 // Finally, we know we have the right number of parameters, install them. 5132 NewFD->setParams(Params); 5133 5134 // Process the non-inheritable attributes on this declaration. 5135 ProcessDeclAttributes(S, NewFD, D, 5136 /*NonInheritable=*/true, /*Inheritable=*/false); 5137 5138 if (!getLangOptions().CPlusPlus) { 5139 // Perform semantic checking on the function declaration. 5140 bool isExplicitSpecialization=false; 5141 if (!NewFD->isInvalidDecl()) { 5142 if (NewFD->getResultType()->isVariablyModifiedType()) { 5143 // Functions returning a variably modified type violate C99 6.7.5.2p2 5144 // because all functions have linkage. 5145 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5146 NewFD->setInvalidDecl(); 5147 } else { 5148 if (NewFD->isMain()) 5149 CheckMain(NewFD, D.getDeclSpec()); 5150 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5151 isExplicitSpecialization)); 5152 } 5153 } 5154 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5155 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5156 "previous declaration set still overloaded"); 5157 } else { 5158 // If the declarator is a template-id, translate the parser's template 5159 // argument list into our AST format. 5160 bool HasExplicitTemplateArgs = false; 5161 TemplateArgumentListInfo TemplateArgs; 5162 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5163 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5164 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5165 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5166 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5167 TemplateId->getTemplateArgs(), 5168 TemplateId->NumArgs); 5169 translateTemplateArguments(TemplateArgsPtr, 5170 TemplateArgs); 5171 TemplateArgsPtr.release(); 5172 5173 HasExplicitTemplateArgs = true; 5174 5175 if (NewFD->isInvalidDecl()) { 5176 HasExplicitTemplateArgs = false; 5177 } else if (FunctionTemplate) { 5178 // Function template with explicit template arguments. 5179 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5180 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5181 5182 HasExplicitTemplateArgs = false; 5183 } else if (!isFunctionTemplateSpecialization && 5184 !D.getDeclSpec().isFriendSpecified()) { 5185 // We have encountered something that the user meant to be a 5186 // specialization (because it has explicitly-specified template 5187 // arguments) but that was not introduced with a "template<>" (or had 5188 // too few of them). 5189 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5190 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5191 << FixItHint::CreateInsertion( 5192 D.getDeclSpec().getSourceRange().getBegin(), 5193 "template<> "); 5194 isFunctionTemplateSpecialization = true; 5195 } else { 5196 // "friend void foo<>(int);" is an implicit specialization decl. 5197 isFunctionTemplateSpecialization = true; 5198 } 5199 } else if (isFriend && isFunctionTemplateSpecialization) { 5200 // This combination is only possible in a recovery case; the user 5201 // wrote something like: 5202 // template <> friend void foo(int); 5203 // which we're recovering from as if the user had written: 5204 // friend void foo<>(int); 5205 // Go ahead and fake up a template id. 5206 HasExplicitTemplateArgs = true; 5207 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5208 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5209 } 5210 5211 // If it's a friend (and only if it's a friend), it's possible 5212 // that either the specialized function type or the specialized 5213 // template is dependent, and therefore matching will fail. In 5214 // this case, don't check the specialization yet. 5215 bool InstantiationDependent = false; 5216 if (isFunctionTemplateSpecialization && isFriend && 5217 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5218 TemplateSpecializationType::anyDependentTemplateArguments( 5219 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5220 InstantiationDependent))) { 5221 assert(HasExplicitTemplateArgs && 5222 "friend function specialization without template args"); 5223 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5224 Previous)) 5225 NewFD->setInvalidDecl(); 5226 } else if (isFunctionTemplateSpecialization) { 5227 if (CurContext->isDependentContext() && CurContext->isRecord() 5228 && !isFriend) { 5229 isDependentClassScopeExplicitSpecialization = true; 5230 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5231 diag::ext_function_specialization_in_class : 5232 diag::err_function_specialization_in_class) 5233 << NewFD->getDeclName(); 5234 } else if (CheckFunctionTemplateSpecialization(NewFD, 5235 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5236 Previous)) 5237 NewFD->setInvalidDecl(); 5238 5239 // C++ [dcl.stc]p1: 5240 // A storage-class-specifier shall not be specified in an explicit 5241 // specialization (14.7.3) 5242 if (SC != SC_None) { 5243 if (SC != NewFD->getStorageClass()) 5244 Diag(NewFD->getLocation(), 5245 diag::err_explicit_specialization_inconsistent_storage_class) 5246 << SC 5247 << FixItHint::CreateRemoval( 5248 D.getDeclSpec().getStorageClassSpecLoc()); 5249 5250 else 5251 Diag(NewFD->getLocation(), 5252 diag::ext_explicit_specialization_storage_class) 5253 << FixItHint::CreateRemoval( 5254 D.getDeclSpec().getStorageClassSpecLoc()); 5255 } 5256 5257 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5258 if (CheckMemberSpecialization(NewFD, Previous)) 5259 NewFD->setInvalidDecl(); 5260 } 5261 5262 // Perform semantic checking on the function declaration. 5263 if (!isDependentClassScopeExplicitSpecialization) { 5264 if (NewFD->isInvalidDecl()) { 5265 // If this is a class member, mark the class invalid immediately. 5266 // This avoids some consistency errors later. 5267 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5268 methodDecl->getParent()->setInvalidDecl(); 5269 } else { 5270 if (NewFD->isMain()) 5271 CheckMain(NewFD, D.getDeclSpec()); 5272 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5273 isExplicitSpecialization)); 5274 } 5275 } 5276 5277 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5278 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5279 "previous declaration set still overloaded"); 5280 5281 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5282 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5283 NewFD->setInvalidDecl(); 5284 5285 NamedDecl *PrincipalDecl = (FunctionTemplate 5286 ? cast<NamedDecl>(FunctionTemplate) 5287 : NewFD); 5288 5289 if (isFriend && D.isRedeclaration()) { 5290 AccessSpecifier Access = AS_public; 5291 if (!NewFD->isInvalidDecl()) 5292 Access = NewFD->getPreviousDeclaration()->getAccess(); 5293 5294 NewFD->setAccess(Access); 5295 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5296 5297 PrincipalDecl->setObjectOfFriendDecl(true); 5298 } 5299 5300 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5301 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5302 PrincipalDecl->setNonMemberOperator(); 5303 5304 // If we have a function template, check the template parameter 5305 // list. This will check and merge default template arguments. 5306 if (FunctionTemplate) { 5307 FunctionTemplateDecl *PrevTemplate = 5308 FunctionTemplate->getPreviousDeclaration(); 5309 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5310 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5311 D.getDeclSpec().isFriendSpecified() 5312 ? (D.isFunctionDefinition() 5313 ? TPC_FriendFunctionTemplateDefinition 5314 : TPC_FriendFunctionTemplate) 5315 : (D.getCXXScopeSpec().isSet() && 5316 DC && DC->isRecord() && 5317 DC->isDependentContext()) 5318 ? TPC_ClassTemplateMember 5319 : TPC_FunctionTemplate); 5320 } 5321 5322 if (NewFD->isInvalidDecl()) { 5323 // Ignore all the rest of this. 5324 } else if (!D.isRedeclaration()) { 5325 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5326 AddToScope }; 5327 // Fake up an access specifier if it's supposed to be a class member. 5328 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5329 NewFD->setAccess(AS_public); 5330 5331 // Qualified decls generally require a previous declaration. 5332 if (D.getCXXScopeSpec().isSet()) { 5333 // ...with the major exception of templated-scope or 5334 // dependent-scope friend declarations. 5335 5336 // TODO: we currently also suppress this check in dependent 5337 // contexts because (1) the parameter depth will be off when 5338 // matching friend templates and (2) we might actually be 5339 // selecting a friend based on a dependent factor. But there 5340 // are situations where these conditions don't apply and we 5341 // can actually do this check immediately. 5342 if (isFriend && 5343 (TemplateParamLists.size() || 5344 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5345 CurContext->isDependentContext())) { 5346 // ignore these 5347 } else { 5348 // The user tried to provide an out-of-line definition for a 5349 // function that is a member of a class or namespace, but there 5350 // was no such member function declared (C++ [class.mfct]p2, 5351 // C++ [namespace.memdef]p2). For example: 5352 // 5353 // class X { 5354 // void f() const; 5355 // }; 5356 // 5357 // void X::f() { } // ill-formed 5358 // 5359 // Complain about this problem, and attempt to suggest close 5360 // matches (e.g., those that differ only in cv-qualifiers and 5361 // whether the parameter types are references). 5362 5363 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5364 NewFD, 5365 ExtraArgs)) { 5366 AddToScope = ExtraArgs.AddToScope; 5367 return Result; 5368 } 5369 } 5370 5371 // Unqualified local friend declarations are required to resolve 5372 // to something. 5373 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5374 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5375 NewFD, 5376 ExtraArgs)) { 5377 AddToScope = ExtraArgs.AddToScope; 5378 return Result; 5379 } 5380 } 5381 5382 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5383 !isFriend && !isFunctionTemplateSpecialization && 5384 !isExplicitSpecialization) { 5385 // An out-of-line member function declaration must also be a 5386 // definition (C++ [dcl.meaning]p1). 5387 // Note that this is not the case for explicit specializations of 5388 // function templates or member functions of class templates, per 5389 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5390 // extension for compatibility with old SWIG code which likes to 5391 // generate them. 5392 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5393 << D.getCXXScopeSpec().getRange(); 5394 } 5395 } 5396 5397 5398 // Handle attributes. We need to have merged decls when handling attributes 5399 // (for example to check for conflicts, etc). 5400 // FIXME: This needs to happen before we merge declarations. Then, 5401 // let attribute merging cope with attribute conflicts. 5402 ProcessDeclAttributes(S, NewFD, D, 5403 /*NonInheritable=*/false, /*Inheritable=*/true); 5404 5405 // attributes declared post-definition are currently ignored 5406 // FIXME: This should happen during attribute merging 5407 if (D.isRedeclaration() && Previous.isSingleResult()) { 5408 const FunctionDecl *Def; 5409 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5410 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5411 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5412 Diag(Def->getLocation(), diag::note_previous_definition); 5413 } 5414 } 5415 5416 AddKnownFunctionAttributes(NewFD); 5417 5418 if (NewFD->hasAttr<OverloadableAttr>() && 5419 !NewFD->getType()->getAs<FunctionProtoType>()) { 5420 Diag(NewFD->getLocation(), 5421 diag::err_attribute_overloadable_no_prototype) 5422 << NewFD; 5423 5424 // Turn this into a variadic function with no parameters. 5425 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5426 FunctionProtoType::ExtProtoInfo EPI; 5427 EPI.Variadic = true; 5428 EPI.ExtInfo = FT->getExtInfo(); 5429 5430 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5431 NewFD->setType(R); 5432 } 5433 5434 // If there's a #pragma GCC visibility in scope, and this isn't a class 5435 // member, set the visibility of this function. 5436 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5437 AddPushedVisibilityAttribute(NewFD); 5438 5439 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5440 // marking the function. 5441 AddCFAuditedAttribute(NewFD); 5442 5443 // If this is a locally-scoped extern C function, update the 5444 // map of such names. 5445 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5446 && !NewFD->isInvalidDecl()) 5447 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5448 5449 // Set this FunctionDecl's range up to the right paren. 5450 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5451 5452 if (getLangOptions().CPlusPlus) { 5453 if (FunctionTemplate) { 5454 if (NewFD->isInvalidDecl()) 5455 FunctionTemplate->setInvalidDecl(); 5456 return FunctionTemplate; 5457 } 5458 } 5459 5460 MarkUnusedFileScopedDecl(NewFD); 5461 5462 if (getLangOptions().CUDA) 5463 if (IdentifierInfo *II = NewFD->getIdentifier()) 5464 if (!NewFD->isInvalidDecl() && 5465 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5466 if (II->isStr("cudaConfigureCall")) { 5467 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5468 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5469 5470 Context.setcudaConfigureCallDecl(NewFD); 5471 } 5472 } 5473 5474 // Here we have an function template explicit specialization at class scope. 5475 // The actually specialization will be postponed to template instatiation 5476 // time via the ClassScopeFunctionSpecializationDecl node. 5477 if (isDependentClassScopeExplicitSpecialization) { 5478 ClassScopeFunctionSpecializationDecl *NewSpec = 5479 ClassScopeFunctionSpecializationDecl::Create( 5480 Context, CurContext, SourceLocation(), 5481 cast<CXXMethodDecl>(NewFD)); 5482 CurContext->addDecl(NewSpec); 5483 AddToScope = false; 5484 } 5485 5486 return NewFD; 5487} 5488 5489/// \brief Perform semantic checking of a new function declaration. 5490/// 5491/// Performs semantic analysis of the new function declaration 5492/// NewFD. This routine performs all semantic checking that does not 5493/// require the actual declarator involved in the declaration, and is 5494/// used both for the declaration of functions as they are parsed 5495/// (called via ActOnDeclarator) and for the declaration of functions 5496/// that have been instantiated via C++ template instantiation (called 5497/// via InstantiateDecl). 5498/// 5499/// \param IsExplicitSpecialiation whether this new function declaration is 5500/// an explicit specialization of the previous declaration. 5501/// 5502/// This sets NewFD->isInvalidDecl() to true if there was an error. 5503/// 5504/// Returns true if the function declaration is a redeclaration. 5505bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5506 LookupResult &Previous, 5507 bool IsExplicitSpecialization) { 5508 assert(!NewFD->getResultType()->isVariablyModifiedType() 5509 && "Variably modified return types are not handled here"); 5510 5511 // Check for a previous declaration of this name. 5512 if (Previous.empty() && NewFD->isExternC()) { 5513 // Since we did not find anything by this name and we're declaring 5514 // an extern "C" function, look for a non-visible extern "C" 5515 // declaration with the same name. 5516 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5517 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5518 if (Pos != LocallyScopedExternalDecls.end()) 5519 Previous.addDecl(Pos->second); 5520 } 5521 5522 bool Redeclaration = false; 5523 5524 // Merge or overload the declaration with an existing declaration of 5525 // the same name, if appropriate. 5526 if (!Previous.empty()) { 5527 // Determine whether NewFD is an overload of PrevDecl or 5528 // a declaration that requires merging. If it's an overload, 5529 // there's no more work to do here; we'll just add the new 5530 // function to the scope. 5531 5532 NamedDecl *OldDecl = 0; 5533 if (!AllowOverloadingOfFunction(Previous, Context)) { 5534 Redeclaration = true; 5535 OldDecl = Previous.getFoundDecl(); 5536 } else { 5537 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5538 /*NewIsUsingDecl*/ false)) { 5539 case Ovl_Match: 5540 Redeclaration = true; 5541 break; 5542 5543 case Ovl_NonFunction: 5544 Redeclaration = true; 5545 break; 5546 5547 case Ovl_Overload: 5548 Redeclaration = false; 5549 break; 5550 } 5551 5552 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5553 // If a function name is overloadable in C, then every function 5554 // with that name must be marked "overloadable". 5555 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5556 << Redeclaration << NewFD; 5557 NamedDecl *OverloadedDecl = 0; 5558 if (Redeclaration) 5559 OverloadedDecl = OldDecl; 5560 else if (!Previous.empty()) 5561 OverloadedDecl = Previous.getRepresentativeDecl(); 5562 if (OverloadedDecl) 5563 Diag(OverloadedDecl->getLocation(), 5564 diag::note_attribute_overloadable_prev_overload); 5565 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5566 Context)); 5567 } 5568 } 5569 5570 if (Redeclaration) { 5571 // NewFD and OldDecl represent declarations that need to be 5572 // merged. 5573 if (MergeFunctionDecl(NewFD, OldDecl)) { 5574 NewFD->setInvalidDecl(); 5575 return Redeclaration; 5576 } 5577 5578 Previous.clear(); 5579 Previous.addDecl(OldDecl); 5580 5581 if (FunctionTemplateDecl *OldTemplateDecl 5582 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5583 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5584 FunctionTemplateDecl *NewTemplateDecl 5585 = NewFD->getDescribedFunctionTemplate(); 5586 assert(NewTemplateDecl && "Template/non-template mismatch"); 5587 if (CXXMethodDecl *Method 5588 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5589 Method->setAccess(OldTemplateDecl->getAccess()); 5590 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5591 } 5592 5593 // If this is an explicit specialization of a member that is a function 5594 // template, mark it as a member specialization. 5595 if (IsExplicitSpecialization && 5596 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5597 NewTemplateDecl->setMemberSpecialization(); 5598 assert(OldTemplateDecl->isMemberSpecialization()); 5599 } 5600 5601 if (OldTemplateDecl->isModulePrivate()) 5602 NewTemplateDecl->setModulePrivate(); 5603 5604 } else { 5605 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5606 NewFD->setAccess(OldDecl->getAccess()); 5607 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5608 } 5609 } 5610 } 5611 5612 // Semantic checking for this function declaration (in isolation). 5613 if (getLangOptions().CPlusPlus) { 5614 // C++-specific checks. 5615 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5616 CheckConstructor(Constructor); 5617 } else if (CXXDestructorDecl *Destructor = 5618 dyn_cast<CXXDestructorDecl>(NewFD)) { 5619 CXXRecordDecl *Record = Destructor->getParent(); 5620 QualType ClassType = Context.getTypeDeclType(Record); 5621 5622 // FIXME: Shouldn't we be able to perform this check even when the class 5623 // type is dependent? Both gcc and edg can handle that. 5624 if (!ClassType->isDependentType()) { 5625 DeclarationName Name 5626 = Context.DeclarationNames.getCXXDestructorName( 5627 Context.getCanonicalType(ClassType)); 5628 if (NewFD->getDeclName() != Name) { 5629 Diag(NewFD->getLocation(), diag::err_destructor_name); 5630 NewFD->setInvalidDecl(); 5631 return Redeclaration; 5632 } 5633 } 5634 } else if (CXXConversionDecl *Conversion 5635 = dyn_cast<CXXConversionDecl>(NewFD)) { 5636 ActOnConversionDeclarator(Conversion); 5637 } 5638 5639 // Find any virtual functions that this function overrides. 5640 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5641 if (!Method->isFunctionTemplateSpecialization() && 5642 !Method->getDescribedFunctionTemplate()) { 5643 if (AddOverriddenMethods(Method->getParent(), Method)) { 5644 // If the function was marked as "static", we have a problem. 5645 if (NewFD->getStorageClass() == SC_Static) { 5646 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5647 << NewFD->getDeclName(); 5648 for (CXXMethodDecl::method_iterator 5649 Overridden = Method->begin_overridden_methods(), 5650 OverriddenEnd = Method->end_overridden_methods(); 5651 Overridden != OverriddenEnd; 5652 ++Overridden) { 5653 Diag((*Overridden)->getLocation(), 5654 diag::note_overridden_virtual_function); 5655 } 5656 } 5657 } 5658 } 5659 } 5660 5661 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5662 if (NewFD->isOverloadedOperator() && 5663 CheckOverloadedOperatorDeclaration(NewFD)) { 5664 NewFD->setInvalidDecl(); 5665 return Redeclaration; 5666 } 5667 5668 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5669 if (NewFD->getLiteralIdentifier() && 5670 CheckLiteralOperatorDeclaration(NewFD)) { 5671 NewFD->setInvalidDecl(); 5672 return Redeclaration; 5673 } 5674 5675 // In C++, check default arguments now that we have merged decls. Unless 5676 // the lexical context is the class, because in this case this is done 5677 // during delayed parsing anyway. 5678 if (!CurContext->isRecord()) 5679 CheckCXXDefaultArguments(NewFD); 5680 5681 // If this function declares a builtin function, check the type of this 5682 // declaration against the expected type for the builtin. 5683 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5684 ASTContext::GetBuiltinTypeError Error; 5685 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5686 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5687 // The type of this function differs from the type of the builtin, 5688 // so forget about the builtin entirely. 5689 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5690 } 5691 } 5692 } 5693 return Redeclaration; 5694} 5695 5696void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5697 // C++ [basic.start.main]p3: A program that declares main to be inline 5698 // or static is ill-formed. 5699 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5700 // shall not appear in a declaration of main. 5701 // static main is not an error under C99, but we should warn about it. 5702 if (FD->getStorageClass() == SC_Static) 5703 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5704 ? diag::err_static_main : diag::warn_static_main) 5705 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5706 if (FD->isInlineSpecified()) 5707 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5708 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5709 5710 QualType T = FD->getType(); 5711 assert(T->isFunctionType() && "function decl is not of function type"); 5712 const FunctionType* FT = T->getAs<FunctionType>(); 5713 5714 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5715 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5716 FD->setInvalidDecl(true); 5717 } 5718 5719 // Treat protoless main() as nullary. 5720 if (isa<FunctionNoProtoType>(FT)) return; 5721 5722 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5723 unsigned nparams = FTP->getNumArgs(); 5724 assert(FD->getNumParams() == nparams); 5725 5726 bool HasExtraParameters = (nparams > 3); 5727 5728 // Darwin passes an undocumented fourth argument of type char**. If 5729 // other platforms start sprouting these, the logic below will start 5730 // getting shifty. 5731 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5732 HasExtraParameters = false; 5733 5734 if (HasExtraParameters) { 5735 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5736 FD->setInvalidDecl(true); 5737 nparams = 3; 5738 } 5739 5740 // FIXME: a lot of the following diagnostics would be improved 5741 // if we had some location information about types. 5742 5743 QualType CharPP = 5744 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5745 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5746 5747 for (unsigned i = 0; i < nparams; ++i) { 5748 QualType AT = FTP->getArgType(i); 5749 5750 bool mismatch = true; 5751 5752 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5753 mismatch = false; 5754 else if (Expected[i] == CharPP) { 5755 // As an extension, the following forms are okay: 5756 // char const ** 5757 // char const * const * 5758 // char * const * 5759 5760 QualifierCollector qs; 5761 const PointerType* PT; 5762 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5763 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5764 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5765 qs.removeConst(); 5766 mismatch = !qs.empty(); 5767 } 5768 } 5769 5770 if (mismatch) { 5771 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5772 // TODO: suggest replacing given type with expected type 5773 FD->setInvalidDecl(true); 5774 } 5775 } 5776 5777 if (nparams == 1 && !FD->isInvalidDecl()) { 5778 Diag(FD->getLocation(), diag::warn_main_one_arg); 5779 } 5780 5781 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5782 Diag(FD->getLocation(), diag::err_main_template_decl); 5783 FD->setInvalidDecl(); 5784 } 5785} 5786 5787bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5788 // FIXME: Need strict checking. In C89, we need to check for 5789 // any assignment, increment, decrement, function-calls, or 5790 // commas outside of a sizeof. In C99, it's the same list, 5791 // except that the aforementioned are allowed in unevaluated 5792 // expressions. Everything else falls under the 5793 // "may accept other forms of constant expressions" exception. 5794 // (We never end up here for C++, so the constant expression 5795 // rules there don't matter.) 5796 if (Init->isConstantInitializer(Context, false)) 5797 return false; 5798 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5799 << Init->getSourceRange(); 5800 return true; 5801} 5802 5803namespace { 5804 // Visits an initialization expression to see if OrigDecl is evaluated in 5805 // its own initialization and throws a warning if it does. 5806 class SelfReferenceChecker 5807 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5808 Sema &S; 5809 Decl *OrigDecl; 5810 bool isRecordType; 5811 bool isPODType; 5812 5813 public: 5814 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5815 5816 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5817 S(S), OrigDecl(OrigDecl) { 5818 isPODType = false; 5819 isRecordType = false; 5820 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5821 isPODType = VD->getType().isPODType(S.Context); 5822 isRecordType = VD->getType()->isRecordType(); 5823 } 5824 } 5825 5826 void VisitExpr(Expr *E) { 5827 if (isa<ObjCMessageExpr>(*E)) return; 5828 if (isRecordType) { 5829 Expr *expr = E; 5830 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5831 ValueDecl *VD = ME->getMemberDecl(); 5832 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5833 expr = ME->getBase(); 5834 } 5835 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5836 HandleDeclRefExpr(DRE); 5837 return; 5838 } 5839 } 5840 Inherited::VisitExpr(E); 5841 } 5842 5843 void VisitMemberExpr(MemberExpr *E) { 5844 if (E->getType()->canDecayToPointerType()) return; 5845 if (isa<FieldDecl>(E->getMemberDecl())) 5846 if (DeclRefExpr *DRE 5847 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5848 HandleDeclRefExpr(DRE); 5849 return; 5850 } 5851 Inherited::VisitMemberExpr(E); 5852 } 5853 5854 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5855 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5856 (isRecordType && E->getCastKind() == CK_NoOp)) { 5857 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5858 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5859 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5860 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5861 HandleDeclRefExpr(DRE); 5862 return; 5863 } 5864 } 5865 Inherited::VisitImplicitCastExpr(E); 5866 } 5867 5868 void VisitUnaryOperator(UnaryOperator *E) { 5869 // For POD record types, addresses of its own members are well-defined. 5870 if (isRecordType && isPODType) return; 5871 Inherited::VisitUnaryOperator(E); 5872 } 5873 5874 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5875 Decl* ReferenceDecl = DRE->getDecl(); 5876 if (OrigDecl != ReferenceDecl) return; 5877 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5878 Sema::NotForRedeclaration); 5879 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5880 S.PDiag(diag::warn_uninit_self_reference_in_init) 5881 << Result.getLookupName() 5882 << OrigDecl->getLocation() 5883 << DRE->getSourceRange()); 5884 } 5885 }; 5886} 5887 5888/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5889void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5890 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5891} 5892 5893/// AddInitializerToDecl - Adds the initializer Init to the 5894/// declaration dcl. If DirectInit is true, this is C++ direct 5895/// initialization rather than copy initialization. 5896void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5897 bool DirectInit, bool TypeMayContainAuto) { 5898 // If there is no declaration, there was an error parsing it. Just ignore 5899 // the initializer. 5900 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5901 return; 5902 5903 // Check for self-references within variable initializers. 5904 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5905 // Variables declared within a function/method body are handled 5906 // by a dataflow analysis. 5907 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5908 CheckSelfReference(RealDecl, Init); 5909 } 5910 else { 5911 CheckSelfReference(RealDecl, Init); 5912 } 5913 5914 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5915 // With declarators parsed the way they are, the parser cannot 5916 // distinguish between a normal initializer and a pure-specifier. 5917 // Thus this grotesque test. 5918 IntegerLiteral *IL; 5919 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5920 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5921 CheckPureMethod(Method, Init->getSourceRange()); 5922 else { 5923 Diag(Method->getLocation(), diag::err_member_function_initialization) 5924 << Method->getDeclName() << Init->getSourceRange(); 5925 Method->setInvalidDecl(); 5926 } 5927 return; 5928 } 5929 5930 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5931 if (!VDecl) { 5932 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5933 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5934 RealDecl->setInvalidDecl(); 5935 return; 5936 } 5937 5938 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5939 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5940 TypeSourceInfo *DeducedType = 0; 5941 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5942 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5943 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5944 << Init->getSourceRange(); 5945 if (!DeducedType) { 5946 RealDecl->setInvalidDecl(); 5947 return; 5948 } 5949 VDecl->setTypeSourceInfo(DeducedType); 5950 VDecl->setType(DeducedType->getType()); 5951 5952 // In ARC, infer lifetime. 5953 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5954 VDecl->setInvalidDecl(); 5955 5956 // If this is a redeclaration, check that the type we just deduced matches 5957 // the previously declared type. 5958 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5959 MergeVarDeclTypes(VDecl, Old); 5960 } 5961 5962 5963 // A definition must end up with a complete type, which means it must be 5964 // complete with the restriction that an array type might be completed by the 5965 // initializer; note that later code assumes this restriction. 5966 QualType BaseDeclType = VDecl->getType(); 5967 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5968 BaseDeclType = Array->getElementType(); 5969 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5970 diag::err_typecheck_decl_incomplete_type)) { 5971 RealDecl->setInvalidDecl(); 5972 return; 5973 } 5974 5975 // The variable can not have an abstract class type. 5976 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5977 diag::err_abstract_type_in_decl, 5978 AbstractVariableType)) 5979 VDecl->setInvalidDecl(); 5980 5981 const VarDecl *Def; 5982 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5983 Diag(VDecl->getLocation(), diag::err_redefinition) 5984 << VDecl->getDeclName(); 5985 Diag(Def->getLocation(), diag::note_previous_definition); 5986 VDecl->setInvalidDecl(); 5987 return; 5988 } 5989 5990 const VarDecl* PrevInit = 0; 5991 if (getLangOptions().CPlusPlus) { 5992 // C++ [class.static.data]p4 5993 // If a static data member is of const integral or const 5994 // enumeration type, its declaration in the class definition can 5995 // specify a constant-initializer which shall be an integral 5996 // constant expression (5.19). In that case, the member can appear 5997 // in integral constant expressions. The member shall still be 5998 // defined in a namespace scope if it is used in the program and the 5999 // namespace scope definition shall not contain an initializer. 6000 // 6001 // We already performed a redefinition check above, but for static 6002 // data members we also need to check whether there was an in-class 6003 // declaration with an initializer. 6004 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6005 Diag(VDecl->getLocation(), diag::err_redefinition) 6006 << VDecl->getDeclName(); 6007 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6008 return; 6009 } 6010 6011 if (VDecl->hasLocalStorage()) 6012 getCurFunction()->setHasBranchProtectedScope(); 6013 6014 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6015 VDecl->setInvalidDecl(); 6016 return; 6017 } 6018 } 6019 6020 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6021 // a kernel function cannot be initialized." 6022 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6023 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6024 VDecl->setInvalidDecl(); 6025 return; 6026 } 6027 6028 // Capture the variable that is being initialized and the style of 6029 // initialization. 6030 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6031 6032 // FIXME: Poor source location information. 6033 InitializationKind Kind 6034 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 6035 Init->getLocStart(), 6036 Init->getLocEnd()) 6037 : InitializationKind::CreateCopy(VDecl->getLocation(), 6038 Init->getLocStart()); 6039 6040 // Get the decls type and save a reference for later, since 6041 // CheckInitializerTypes may change it. 6042 QualType DclT = VDecl->getType(), SavT = DclT; 6043 if (VDecl->isLocalVarDecl()) { 6044 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 6045 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6046 VDecl->setInvalidDecl(); 6047 } else if (!VDecl->isInvalidDecl()) { 6048 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6049 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6050 MultiExprArg(*this, &Init, 1), 6051 &DclT); 6052 if (Result.isInvalid()) { 6053 VDecl->setInvalidDecl(); 6054 return; 6055 } 6056 6057 Init = Result.takeAs<Expr>(); 6058 6059 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6060 // Don't check invalid declarations to avoid emitting useless diagnostics. 6061 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6062 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6063 CheckForConstantInitializer(Init, DclT); 6064 } 6065 } 6066 } else if (VDecl->isStaticDataMember() && 6067 VDecl->getLexicalDeclContext()->isRecord()) { 6068 // This is an in-class initialization for a static data member, e.g., 6069 // 6070 // struct S { 6071 // static const int value = 17; 6072 // }; 6073 6074 // Try to perform the initialization regardless. 6075 if (!VDecl->isInvalidDecl()) { 6076 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6077 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6078 MultiExprArg(*this, &Init, 1), 6079 &DclT); 6080 if (Result.isInvalid()) { 6081 VDecl->setInvalidDecl(); 6082 return; 6083 } 6084 6085 Init = Result.takeAs<Expr>(); 6086 } 6087 6088 // C++ [class.mem]p4: 6089 // A member-declarator can contain a constant-initializer only 6090 // if it declares a static member (9.4) of const integral or 6091 // const enumeration type, see 9.4.2. 6092 // 6093 // C++0x [class.static.data]p3: 6094 // If a non-volatile const static data member is of integral or 6095 // enumeration type, its declaration in the class definition can 6096 // specify a brace-or-equal-initializer in which every initalizer-clause 6097 // that is an assignment-expression is a constant expression. A static 6098 // data member of literal type can be declared in the class definition 6099 // with the constexpr specifier; if so, its declaration shall specify a 6100 // brace-or-equal-initializer in which every initializer-clause that is 6101 // an assignment-expression is a constant expression. 6102 QualType T = VDecl->getType(); 6103 6104 // Do nothing on dependent types. 6105 if (T->isDependentType()) { 6106 6107 // Allow any 'static constexpr' members, whether or not they are of literal 6108 // type. We separately check that the initializer is a constant expression, 6109 // which implicitly requires the member to be of literal type. 6110 } else if (VDecl->isConstexpr()) { 6111 6112 // Require constness. 6113 } else if (!T.isConstQualified()) { 6114 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6115 << Init->getSourceRange(); 6116 VDecl->setInvalidDecl(); 6117 6118 // We allow integer constant expressions in all cases. 6119 } else if (T->isIntegralOrEnumerationType()) { 6120 // Check whether the expression is a constant expression. 6121 SourceLocation Loc; 6122 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6123 // In C++0x, a non-constexpr const static data member with an 6124 // in-class initializer cannot be volatile. 6125 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6126 else if (Init->isValueDependent()) 6127 ; // Nothing to check. 6128 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6129 ; // Ok, it's an ICE! 6130 else if (Init->isEvaluatable(Context)) { 6131 // If we can constant fold the initializer through heroics, accept it, 6132 // but report this as a use of an extension for -pedantic. 6133 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6134 << Init->getSourceRange(); 6135 } else { 6136 // Otherwise, this is some crazy unknown case. Report the issue at the 6137 // location provided by the isIntegerConstantExpr failed check. 6138 Diag(Loc, diag::err_in_class_initializer_non_constant) 6139 << Init->getSourceRange(); 6140 VDecl->setInvalidDecl(); 6141 } 6142 6143 // We allow floating-point constants as an extension. 6144 } else if (T->isFloatingType()) { // also permits complex, which is ok 6145 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6146 << T << Init->getSourceRange(); 6147 if (getLangOptions().CPlusPlus0x) 6148 Diag(VDecl->getLocation(), 6149 diag::note_in_class_initializer_float_type_constexpr) 6150 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6151 6152 if (!Init->isValueDependent() && 6153 !Init->isConstantInitializer(Context, false)) { 6154 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6155 << Init->getSourceRange(); 6156 VDecl->setInvalidDecl(); 6157 } 6158 6159 // Suggest adding 'constexpr' in C++0x for literal types. 6160 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6161 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6162 << T << Init->getSourceRange() 6163 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6164 VDecl->setConstexpr(true); 6165 6166 } else { 6167 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6168 << T << Init->getSourceRange(); 6169 VDecl->setInvalidDecl(); 6170 } 6171 } else if (VDecl->isFileVarDecl()) { 6172 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6173 (!getLangOptions().CPlusPlus || 6174 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6175 Diag(VDecl->getLocation(), diag::warn_extern_init); 6176 if (!VDecl->isInvalidDecl()) { 6177 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6178 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6179 MultiExprArg(*this, &Init, 1), 6180 &DclT); 6181 if (Result.isInvalid()) { 6182 VDecl->setInvalidDecl(); 6183 return; 6184 } 6185 6186 Init = Result.takeAs<Expr>(); 6187 } 6188 6189 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6190 // Don't check invalid declarations to avoid emitting useless diagnostics. 6191 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6192 // C99 6.7.8p4. All file scoped initializers need to be constant. 6193 CheckForConstantInitializer(Init, DclT); 6194 } 6195 } 6196 // If the type changed, it means we had an incomplete type that was 6197 // completed by the initializer. For example: 6198 // int ary[] = { 1, 3, 5 }; 6199 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6200 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6201 VDecl->setType(DclT); 6202 Init->setType(DclT.getNonReferenceType()); 6203 } 6204 6205 // Check any implicit conversions within the expression. 6206 CheckImplicitConversions(Init, VDecl->getLocation()); 6207 6208 if (!VDecl->isInvalidDecl()) 6209 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6210 6211 Init = MaybeCreateExprWithCleanups(Init); 6212 // Attach the initializer to the decl. 6213 VDecl->setInit(Init); 6214 6215 CheckCompleteVariableDeclaration(VDecl); 6216} 6217 6218/// ActOnInitializerError - Given that there was an error parsing an 6219/// initializer for the given declaration, try to return to some form 6220/// of sanity. 6221void Sema::ActOnInitializerError(Decl *D) { 6222 // Our main concern here is re-establishing invariants like "a 6223 // variable's type is either dependent or complete". 6224 if (!D || D->isInvalidDecl()) return; 6225 6226 VarDecl *VD = dyn_cast<VarDecl>(D); 6227 if (!VD) return; 6228 6229 // Auto types are meaningless if we can't make sense of the initializer. 6230 if (ParsingInitForAutoVars.count(D)) { 6231 D->setInvalidDecl(); 6232 return; 6233 } 6234 6235 QualType Ty = VD->getType(); 6236 if (Ty->isDependentType()) return; 6237 6238 // Require a complete type. 6239 if (RequireCompleteType(VD->getLocation(), 6240 Context.getBaseElementType(Ty), 6241 diag::err_typecheck_decl_incomplete_type)) { 6242 VD->setInvalidDecl(); 6243 return; 6244 } 6245 6246 // Require an abstract type. 6247 if (RequireNonAbstractType(VD->getLocation(), Ty, 6248 diag::err_abstract_type_in_decl, 6249 AbstractVariableType)) { 6250 VD->setInvalidDecl(); 6251 return; 6252 } 6253 6254 // Don't bother complaining about constructors or destructors, 6255 // though. 6256} 6257 6258void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6259 bool TypeMayContainAuto) { 6260 // If there is no declaration, there was an error parsing it. Just ignore it. 6261 if (RealDecl == 0) 6262 return; 6263 6264 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6265 QualType Type = Var->getType(); 6266 6267 // C++0x [dcl.spec.auto]p3 6268 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6269 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6270 << Var->getDeclName() << Type; 6271 Var->setInvalidDecl(); 6272 return; 6273 } 6274 6275 // C++0x [class.static.data]p3: A static data member can be declared with 6276 // the constexpr specifier; if so, its declaration shall specify 6277 // a brace-or-equal-initializer. 6278 if (Var->isConstexpr() && Var->isStaticDataMember() && 6279 !Var->isThisDeclarationADefinition()) { 6280 Diag(Var->getLocation(), diag::err_constexpr_static_mem_var_requires_init) 6281 << Var->getDeclName(); 6282 Var->setInvalidDecl(); 6283 return; 6284 } 6285 6286 switch (Var->isThisDeclarationADefinition()) { 6287 case VarDecl::Definition: 6288 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6289 break; 6290 6291 // We have an out-of-line definition of a static data member 6292 // that has an in-class initializer, so we type-check this like 6293 // a declaration. 6294 // 6295 // Fall through 6296 6297 case VarDecl::DeclarationOnly: 6298 // It's only a declaration. 6299 6300 // Block scope. C99 6.7p7: If an identifier for an object is 6301 // declared with no linkage (C99 6.2.2p6), the type for the 6302 // object shall be complete. 6303 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6304 !Var->getLinkage() && !Var->isInvalidDecl() && 6305 RequireCompleteType(Var->getLocation(), Type, 6306 diag::err_typecheck_decl_incomplete_type)) 6307 Var->setInvalidDecl(); 6308 6309 // Make sure that the type is not abstract. 6310 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6311 RequireNonAbstractType(Var->getLocation(), Type, 6312 diag::err_abstract_type_in_decl, 6313 AbstractVariableType)) 6314 Var->setInvalidDecl(); 6315 return; 6316 6317 case VarDecl::TentativeDefinition: 6318 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6319 // object that has file scope without an initializer, and without a 6320 // storage-class specifier or with the storage-class specifier "static", 6321 // constitutes a tentative definition. Note: A tentative definition with 6322 // external linkage is valid (C99 6.2.2p5). 6323 if (!Var->isInvalidDecl()) { 6324 if (const IncompleteArrayType *ArrayT 6325 = Context.getAsIncompleteArrayType(Type)) { 6326 if (RequireCompleteType(Var->getLocation(), 6327 ArrayT->getElementType(), 6328 diag::err_illegal_decl_array_incomplete_type)) 6329 Var->setInvalidDecl(); 6330 } else if (Var->getStorageClass() == SC_Static) { 6331 // C99 6.9.2p3: If the declaration of an identifier for an object is 6332 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6333 // declared type shall not be an incomplete type. 6334 // NOTE: code such as the following 6335 // static struct s; 6336 // struct s { int a; }; 6337 // is accepted by gcc. Hence here we issue a warning instead of 6338 // an error and we do not invalidate the static declaration. 6339 // NOTE: to avoid multiple warnings, only check the first declaration. 6340 if (Var->getPreviousDeclaration() == 0) 6341 RequireCompleteType(Var->getLocation(), Type, 6342 diag::ext_typecheck_decl_incomplete_type); 6343 } 6344 } 6345 6346 // Record the tentative definition; we're done. 6347 if (!Var->isInvalidDecl()) 6348 TentativeDefinitions.push_back(Var); 6349 return; 6350 } 6351 6352 // Provide a specific diagnostic for uninitialized variable 6353 // definitions with incomplete array type. 6354 if (Type->isIncompleteArrayType()) { 6355 Diag(Var->getLocation(), 6356 diag::err_typecheck_incomplete_array_needs_initializer); 6357 Var->setInvalidDecl(); 6358 return; 6359 } 6360 6361 // Provide a specific diagnostic for uninitialized variable 6362 // definitions with reference type. 6363 if (Type->isReferenceType()) { 6364 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6365 << Var->getDeclName() 6366 << SourceRange(Var->getLocation(), Var->getLocation()); 6367 Var->setInvalidDecl(); 6368 return; 6369 } 6370 6371 // Do not attempt to type-check the default initializer for a 6372 // variable with dependent type. 6373 if (Type->isDependentType()) 6374 return; 6375 6376 if (Var->isInvalidDecl()) 6377 return; 6378 6379 if (RequireCompleteType(Var->getLocation(), 6380 Context.getBaseElementType(Type), 6381 diag::err_typecheck_decl_incomplete_type)) { 6382 Var->setInvalidDecl(); 6383 return; 6384 } 6385 6386 // The variable can not have an abstract class type. 6387 if (RequireNonAbstractType(Var->getLocation(), Type, 6388 diag::err_abstract_type_in_decl, 6389 AbstractVariableType)) { 6390 Var->setInvalidDecl(); 6391 return; 6392 } 6393 6394 // Check for jumps past the implicit initializer. C++0x 6395 // clarifies that this applies to a "variable with automatic 6396 // storage duration", not a "local variable". 6397 // C++11 [stmt.dcl]p3 6398 // A program that jumps from a point where a variable with automatic 6399 // storage duration is not in scope to a point where it is in scope is 6400 // ill-formed unless the variable has scalar type, class type with a 6401 // trivial default constructor and a trivial destructor, a cv-qualified 6402 // version of one of these types, or an array of one of the preceding 6403 // types and is declared without an initializer. 6404 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6405 if (const RecordType *Record 6406 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6407 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6408 // Mark the function for further checking even if the looser rules of 6409 // C++11 do not require such checks, so that we can diagnose 6410 // incompatibilities with C++98. 6411 if (!CXXRecord->isPOD()) 6412 getCurFunction()->setHasBranchProtectedScope(); 6413 } 6414 } 6415 6416 // C++03 [dcl.init]p9: 6417 // If no initializer is specified for an object, and the 6418 // object is of (possibly cv-qualified) non-POD class type (or 6419 // array thereof), the object shall be default-initialized; if 6420 // the object is of const-qualified type, the underlying class 6421 // type shall have a user-declared default 6422 // constructor. Otherwise, if no initializer is specified for 6423 // a non- static object, the object and its subobjects, if 6424 // any, have an indeterminate initial value); if the object 6425 // or any of its subobjects are of const-qualified type, the 6426 // program is ill-formed. 6427 // C++0x [dcl.init]p11: 6428 // If no initializer is specified for an object, the object is 6429 // default-initialized; [...]. 6430 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6431 InitializationKind Kind 6432 = InitializationKind::CreateDefault(Var->getLocation()); 6433 6434 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6435 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6436 MultiExprArg(*this, 0, 0)); 6437 if (Init.isInvalid()) 6438 Var->setInvalidDecl(); 6439 else if (Init.get()) 6440 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6441 6442 CheckCompleteVariableDeclaration(Var); 6443 } 6444} 6445 6446void Sema::ActOnCXXForRangeDecl(Decl *D) { 6447 VarDecl *VD = dyn_cast<VarDecl>(D); 6448 if (!VD) { 6449 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6450 D->setInvalidDecl(); 6451 return; 6452 } 6453 6454 VD->setCXXForRangeDecl(true); 6455 6456 // for-range-declaration cannot be given a storage class specifier. 6457 int Error = -1; 6458 switch (VD->getStorageClassAsWritten()) { 6459 case SC_None: 6460 break; 6461 case SC_Extern: 6462 Error = 0; 6463 break; 6464 case SC_Static: 6465 Error = 1; 6466 break; 6467 case SC_PrivateExtern: 6468 Error = 2; 6469 break; 6470 case SC_Auto: 6471 Error = 3; 6472 break; 6473 case SC_Register: 6474 Error = 4; 6475 break; 6476 case SC_OpenCLWorkGroupLocal: 6477 llvm_unreachable("Unexpected storage class"); 6478 } 6479 if (VD->isConstexpr()) 6480 Error = 5; 6481 if (Error != -1) { 6482 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6483 << VD->getDeclName() << Error; 6484 D->setInvalidDecl(); 6485 } 6486} 6487 6488void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6489 if (var->isInvalidDecl()) return; 6490 6491 // In ARC, don't allow jumps past the implicit initialization of a 6492 // local retaining variable. 6493 if (getLangOptions().ObjCAutoRefCount && 6494 var->hasLocalStorage()) { 6495 switch (var->getType().getObjCLifetime()) { 6496 case Qualifiers::OCL_None: 6497 case Qualifiers::OCL_ExplicitNone: 6498 case Qualifiers::OCL_Autoreleasing: 6499 break; 6500 6501 case Qualifiers::OCL_Weak: 6502 case Qualifiers::OCL_Strong: 6503 getCurFunction()->setHasBranchProtectedScope(); 6504 break; 6505 } 6506 } 6507 6508 // All the following checks are C++ only. 6509 if (!getLangOptions().CPlusPlus) return; 6510 6511 QualType baseType = Context.getBaseElementType(var->getType()); 6512 if (baseType->isDependentType()) return; 6513 6514 // __block variables might require us to capture a copy-initializer. 6515 if (var->hasAttr<BlocksAttr>()) { 6516 // It's currently invalid to ever have a __block variable with an 6517 // array type; should we diagnose that here? 6518 6519 // Regardless, we don't want to ignore array nesting when 6520 // constructing this copy. 6521 QualType type = var->getType(); 6522 6523 if (type->isStructureOrClassType()) { 6524 SourceLocation poi = var->getLocation(); 6525 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6526 ExprResult result = 6527 PerformCopyInitialization( 6528 InitializedEntity::InitializeBlock(poi, type, false), 6529 poi, Owned(varRef)); 6530 if (!result.isInvalid()) { 6531 result = MaybeCreateExprWithCleanups(result); 6532 Expr *init = result.takeAs<Expr>(); 6533 Context.setBlockVarCopyInits(var, init); 6534 } 6535 } 6536 } 6537 6538 Expr *Init = var->getInit(); 6539 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6540 6541 if (!var->getDeclContext()->isDependentContext() && 6542 (var->isConstexpr() || IsGlobal) && Init && 6543 !Init->isConstantInitializer(Context, baseType->isReferenceType())) { 6544 // FIXME: Improve this diagnostic to explain why the initializer is not 6545 // a constant expression. 6546 if (var->isConstexpr()) 6547 Diag(var->getLocation(), diag::err_constexpr_var_requires_const_init) 6548 << var << Init->getSourceRange(); 6549 if (IsGlobal) 6550 Diag(var->getLocation(), diag::warn_global_constructor) 6551 << Init->getSourceRange(); 6552 } 6553 6554 // Require the destructor. 6555 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6556 FinalizeVarWithDestructor(var, recordType); 6557} 6558 6559/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6560/// any semantic actions necessary after any initializer has been attached. 6561void 6562Sema::FinalizeDeclaration(Decl *ThisDecl) { 6563 // Note that we are no longer parsing the initializer for this declaration. 6564 ParsingInitForAutoVars.erase(ThisDecl); 6565} 6566 6567Sema::DeclGroupPtrTy 6568Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6569 Decl **Group, unsigned NumDecls) { 6570 SmallVector<Decl*, 8> Decls; 6571 6572 if (DS.isTypeSpecOwned()) 6573 Decls.push_back(DS.getRepAsDecl()); 6574 6575 for (unsigned i = 0; i != NumDecls; ++i) 6576 if (Decl *D = Group[i]) 6577 Decls.push_back(D); 6578 6579 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6580 DS.getTypeSpecType() == DeclSpec::TST_auto); 6581} 6582 6583/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6584/// group, performing any necessary semantic checking. 6585Sema::DeclGroupPtrTy 6586Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6587 bool TypeMayContainAuto) { 6588 // C++0x [dcl.spec.auto]p7: 6589 // If the type deduced for the template parameter U is not the same in each 6590 // deduction, the program is ill-formed. 6591 // FIXME: When initializer-list support is added, a distinction is needed 6592 // between the deduced type U and the deduced type which 'auto' stands for. 6593 // auto a = 0, b = { 1, 2, 3 }; 6594 // is legal because the deduced type U is 'int' in both cases. 6595 if (TypeMayContainAuto && NumDecls > 1) { 6596 QualType Deduced; 6597 CanQualType DeducedCanon; 6598 VarDecl *DeducedDecl = 0; 6599 for (unsigned i = 0; i != NumDecls; ++i) { 6600 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6601 AutoType *AT = D->getType()->getContainedAutoType(); 6602 // Don't reissue diagnostics when instantiating a template. 6603 if (AT && D->isInvalidDecl()) 6604 break; 6605 if (AT && AT->isDeduced()) { 6606 QualType U = AT->getDeducedType(); 6607 CanQualType UCanon = Context.getCanonicalType(U); 6608 if (Deduced.isNull()) { 6609 Deduced = U; 6610 DeducedCanon = UCanon; 6611 DeducedDecl = D; 6612 } else if (DeducedCanon != UCanon) { 6613 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6614 diag::err_auto_different_deductions) 6615 << Deduced << DeducedDecl->getDeclName() 6616 << U << D->getDeclName() 6617 << DeducedDecl->getInit()->getSourceRange() 6618 << D->getInit()->getSourceRange(); 6619 D->setInvalidDecl(); 6620 break; 6621 } 6622 } 6623 } 6624 } 6625 } 6626 6627 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6628} 6629 6630 6631/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6632/// to introduce parameters into function prototype scope. 6633Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6634 const DeclSpec &DS = D.getDeclSpec(); 6635 6636 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6637 // C++03 [dcl.stc]p2 also permits 'auto'. 6638 VarDecl::StorageClass StorageClass = SC_None; 6639 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6640 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6641 StorageClass = SC_Register; 6642 StorageClassAsWritten = SC_Register; 6643 } else if (getLangOptions().CPlusPlus && 6644 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6645 StorageClass = SC_Auto; 6646 StorageClassAsWritten = SC_Auto; 6647 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6648 Diag(DS.getStorageClassSpecLoc(), 6649 diag::err_invalid_storage_class_in_func_decl); 6650 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6651 } 6652 6653 if (D.getDeclSpec().isThreadSpecified()) 6654 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6655 if (D.getDeclSpec().isConstexprSpecified()) 6656 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6657 << 0; 6658 6659 DiagnoseFunctionSpecifiers(D); 6660 6661 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6662 QualType parmDeclType = TInfo->getType(); 6663 6664 if (getLangOptions().CPlusPlus) { 6665 // Check that there are no default arguments inside the type of this 6666 // parameter. 6667 CheckExtraCXXDefaultArguments(D); 6668 6669 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6670 if (D.getCXXScopeSpec().isSet()) { 6671 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6672 << D.getCXXScopeSpec().getRange(); 6673 D.getCXXScopeSpec().clear(); 6674 } 6675 } 6676 6677 // Ensure we have a valid name 6678 IdentifierInfo *II = 0; 6679 if (D.hasName()) { 6680 II = D.getIdentifier(); 6681 if (!II) { 6682 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6683 << GetNameForDeclarator(D).getName().getAsString(); 6684 D.setInvalidType(true); 6685 } 6686 } 6687 6688 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6689 if (II) { 6690 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6691 ForRedeclaration); 6692 LookupName(R, S); 6693 if (R.isSingleResult()) { 6694 NamedDecl *PrevDecl = R.getFoundDecl(); 6695 if (PrevDecl->isTemplateParameter()) { 6696 // Maybe we will complain about the shadowed template parameter. 6697 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6698 // Just pretend that we didn't see the previous declaration. 6699 PrevDecl = 0; 6700 } else if (S->isDeclScope(PrevDecl)) { 6701 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6702 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6703 6704 // Recover by removing the name 6705 II = 0; 6706 D.SetIdentifier(0, D.getIdentifierLoc()); 6707 D.setInvalidType(true); 6708 } 6709 } 6710 } 6711 6712 // Temporarily put parameter variables in the translation unit, not 6713 // the enclosing context. This prevents them from accidentally 6714 // looking like class members in C++. 6715 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6716 D.getSourceRange().getBegin(), 6717 D.getIdentifierLoc(), II, 6718 parmDeclType, TInfo, 6719 StorageClass, StorageClassAsWritten); 6720 6721 if (D.isInvalidType()) 6722 New->setInvalidDecl(); 6723 6724 assert(S->isFunctionPrototypeScope()); 6725 assert(S->getFunctionPrototypeDepth() >= 1); 6726 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6727 S->getNextFunctionPrototypeIndex()); 6728 6729 // Add the parameter declaration into this scope. 6730 S->AddDecl(New); 6731 if (II) 6732 IdResolver.AddDecl(New); 6733 6734 ProcessDeclAttributes(S, New, D); 6735 6736 if (D.getDeclSpec().isModulePrivateSpecified()) 6737 Diag(New->getLocation(), diag::err_module_private_local) 6738 << 1 << New->getDeclName() 6739 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6740 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6741 6742 if (New->hasAttr<BlocksAttr>()) { 6743 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6744 } 6745 return New; 6746} 6747 6748/// \brief Synthesizes a variable for a parameter arising from a 6749/// typedef. 6750ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6751 SourceLocation Loc, 6752 QualType T) { 6753 /* FIXME: setting StartLoc == Loc. 6754 Would it be worth to modify callers so as to provide proper source 6755 location for the unnamed parameters, embedding the parameter's type? */ 6756 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6757 T, Context.getTrivialTypeSourceInfo(T, Loc), 6758 SC_None, SC_None, 0); 6759 Param->setImplicit(); 6760 return Param; 6761} 6762 6763void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6764 ParmVarDecl * const *ParamEnd) { 6765 // Don't diagnose unused-parameter errors in template instantiations; we 6766 // will already have done so in the template itself. 6767 if (!ActiveTemplateInstantiations.empty()) 6768 return; 6769 6770 for (; Param != ParamEnd; ++Param) { 6771 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6772 !(*Param)->hasAttr<UnusedAttr>()) { 6773 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6774 << (*Param)->getDeclName(); 6775 } 6776 } 6777} 6778 6779void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6780 ParmVarDecl * const *ParamEnd, 6781 QualType ReturnTy, 6782 NamedDecl *D) { 6783 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6784 return; 6785 6786 // Warn if the return value is pass-by-value and larger than the specified 6787 // threshold. 6788 if (ReturnTy.isPODType(Context)) { 6789 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6790 if (Size > LangOpts.NumLargeByValueCopy) 6791 Diag(D->getLocation(), diag::warn_return_value_size) 6792 << D->getDeclName() << Size; 6793 } 6794 6795 // Warn if any parameter is pass-by-value and larger than the specified 6796 // threshold. 6797 for (; Param != ParamEnd; ++Param) { 6798 QualType T = (*Param)->getType(); 6799 if (!T.isPODType(Context)) 6800 continue; 6801 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6802 if (Size > LangOpts.NumLargeByValueCopy) 6803 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6804 << (*Param)->getDeclName() << Size; 6805 } 6806} 6807 6808ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6809 SourceLocation NameLoc, IdentifierInfo *Name, 6810 QualType T, TypeSourceInfo *TSInfo, 6811 VarDecl::StorageClass StorageClass, 6812 VarDecl::StorageClass StorageClassAsWritten) { 6813 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6814 if (getLangOptions().ObjCAutoRefCount && 6815 T.getObjCLifetime() == Qualifiers::OCL_None && 6816 T->isObjCLifetimeType()) { 6817 6818 Qualifiers::ObjCLifetime lifetime; 6819 6820 // Special cases for arrays: 6821 // - if it's const, use __unsafe_unretained 6822 // - otherwise, it's an error 6823 if (T->isArrayType()) { 6824 if (!T.isConstQualified()) { 6825 DelayedDiagnostics.add( 6826 sema::DelayedDiagnostic::makeForbiddenType( 6827 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6828 } 6829 lifetime = Qualifiers::OCL_ExplicitNone; 6830 } else { 6831 lifetime = T->getObjCARCImplicitLifetime(); 6832 } 6833 T = Context.getLifetimeQualifiedType(T, lifetime); 6834 } 6835 6836 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6837 Context.getAdjustedParameterType(T), 6838 TSInfo, 6839 StorageClass, StorageClassAsWritten, 6840 0); 6841 6842 // Parameters can not be abstract class types. 6843 // For record types, this is done by the AbstractClassUsageDiagnoser once 6844 // the class has been completely parsed. 6845 if (!CurContext->isRecord() && 6846 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6847 AbstractParamType)) 6848 New->setInvalidDecl(); 6849 6850 // Parameter declarators cannot be interface types. All ObjC objects are 6851 // passed by reference. 6852 if (T->isObjCObjectType()) { 6853 Diag(NameLoc, 6854 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6855 << FixItHint::CreateInsertion(NameLoc, "*"); 6856 T = Context.getObjCObjectPointerType(T); 6857 New->setType(T); 6858 } 6859 6860 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6861 // duration shall not be qualified by an address-space qualifier." 6862 // Since all parameters have automatic store duration, they can not have 6863 // an address space. 6864 if (T.getAddressSpace() != 0) { 6865 Diag(NameLoc, diag::err_arg_with_address_space); 6866 New->setInvalidDecl(); 6867 } 6868 6869 return New; 6870} 6871 6872void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6873 SourceLocation LocAfterDecls) { 6874 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6875 6876 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6877 // for a K&R function. 6878 if (!FTI.hasPrototype) { 6879 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6880 --i; 6881 if (FTI.ArgInfo[i].Param == 0) { 6882 llvm::SmallString<256> Code; 6883 llvm::raw_svector_ostream(Code) << " int " 6884 << FTI.ArgInfo[i].Ident->getName() 6885 << ";\n"; 6886 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6887 << FTI.ArgInfo[i].Ident 6888 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6889 6890 // Implicitly declare the argument as type 'int' for lack of a better 6891 // type. 6892 AttributeFactory attrs; 6893 DeclSpec DS(attrs); 6894 const char* PrevSpec; // unused 6895 unsigned DiagID; // unused 6896 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6897 PrevSpec, DiagID); 6898 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6899 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6900 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6901 } 6902 } 6903 } 6904} 6905 6906Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6907 Declarator &D) { 6908 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6909 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6910 Scope *ParentScope = FnBodyScope->getParent(); 6911 6912 D.setFunctionDefinitionKind(FDK_Definition); 6913 Decl *DP = HandleDeclarator(ParentScope, D, 6914 MultiTemplateParamsArg(*this)); 6915 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6916} 6917 6918static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6919 // Don't warn about invalid declarations. 6920 if (FD->isInvalidDecl()) 6921 return false; 6922 6923 // Or declarations that aren't global. 6924 if (!FD->isGlobal()) 6925 return false; 6926 6927 // Don't warn about C++ member functions. 6928 if (isa<CXXMethodDecl>(FD)) 6929 return false; 6930 6931 // Don't warn about 'main'. 6932 if (FD->isMain()) 6933 return false; 6934 6935 // Don't warn about inline functions. 6936 if (FD->isInlined()) 6937 return false; 6938 6939 // Don't warn about function templates. 6940 if (FD->getDescribedFunctionTemplate()) 6941 return false; 6942 6943 // Don't warn about function template specializations. 6944 if (FD->isFunctionTemplateSpecialization()) 6945 return false; 6946 6947 bool MissingPrototype = true; 6948 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6949 Prev; Prev = Prev->getPreviousDeclaration()) { 6950 // Ignore any declarations that occur in function or method 6951 // scope, because they aren't visible from the header. 6952 if (Prev->getDeclContext()->isFunctionOrMethod()) 6953 continue; 6954 6955 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6956 break; 6957 } 6958 6959 return MissingPrototype; 6960} 6961 6962void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6963 // Don't complain if we're in GNU89 mode and the previous definition 6964 // was an extern inline function. 6965 const FunctionDecl *Definition; 6966 if (FD->isDefined(Definition) && 6967 !canRedefineFunction(Definition, getLangOptions())) { 6968 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6969 Definition->getStorageClass() == SC_Extern) 6970 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6971 << FD->getDeclName() << getLangOptions().CPlusPlus; 6972 else 6973 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6974 Diag(Definition->getLocation(), diag::note_previous_definition); 6975 } 6976} 6977 6978Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6979 // Clear the last template instantiation error context. 6980 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6981 6982 if (!D) 6983 return D; 6984 FunctionDecl *FD = 0; 6985 6986 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6987 FD = FunTmpl->getTemplatedDecl(); 6988 else 6989 FD = cast<FunctionDecl>(D); 6990 6991 // Enter a new function scope 6992 PushFunctionScope(); 6993 6994 // See if this is a redefinition. 6995 if (!FD->isLateTemplateParsed()) 6996 CheckForFunctionRedefinition(FD); 6997 6998 // Builtin functions cannot be defined. 6999 if (unsigned BuiltinID = FD->getBuiltinID()) { 7000 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7001 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7002 FD->setInvalidDecl(); 7003 } 7004 } 7005 7006 // The return type of a function definition must be complete 7007 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7008 QualType ResultType = FD->getResultType(); 7009 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7010 !FD->isInvalidDecl() && 7011 RequireCompleteType(FD->getLocation(), ResultType, 7012 diag::err_func_def_incomplete_result)) 7013 FD->setInvalidDecl(); 7014 7015 // GNU warning -Wmissing-prototypes: 7016 // Warn if a global function is defined without a previous 7017 // prototype declaration. This warning is issued even if the 7018 // definition itself provides a prototype. The aim is to detect 7019 // global functions that fail to be declared in header files. 7020 if (ShouldWarnAboutMissingPrototype(FD)) 7021 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7022 7023 if (FnBodyScope) 7024 PushDeclContext(FnBodyScope, FD); 7025 7026 // Check the validity of our function parameters 7027 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7028 /*CheckParameterNames=*/true); 7029 7030 // Introduce our parameters into the function scope 7031 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7032 ParmVarDecl *Param = FD->getParamDecl(p); 7033 Param->setOwningFunction(FD); 7034 7035 // If this has an identifier, add it to the scope stack. 7036 if (Param->getIdentifier() && FnBodyScope) { 7037 CheckShadow(FnBodyScope, Param); 7038 7039 PushOnScopeChains(Param, FnBodyScope); 7040 } 7041 } 7042 7043 // Checking attributes of current function definition 7044 // dllimport attribute. 7045 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7046 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7047 // dllimport attribute cannot be directly applied to definition. 7048 // Microsoft accepts dllimport for functions defined within class scope. 7049 if (!DA->isInherited() && 7050 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7051 Diag(FD->getLocation(), 7052 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7053 << "dllimport"; 7054 FD->setInvalidDecl(); 7055 return FD; 7056 } 7057 7058 // Visual C++ appears to not think this is an issue, so only issue 7059 // a warning when Microsoft extensions are disabled. 7060 if (!LangOpts.MicrosoftExt) { 7061 // If a symbol previously declared dllimport is later defined, the 7062 // attribute is ignored in subsequent references, and a warning is 7063 // emitted. 7064 Diag(FD->getLocation(), 7065 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7066 << FD->getName() << "dllimport"; 7067 } 7068 } 7069 return FD; 7070} 7071 7072/// \brief Given the set of return statements within a function body, 7073/// compute the variables that are subject to the named return value 7074/// optimization. 7075/// 7076/// Each of the variables that is subject to the named return value 7077/// optimization will be marked as NRVO variables in the AST, and any 7078/// return statement that has a marked NRVO variable as its NRVO candidate can 7079/// use the named return value optimization. 7080/// 7081/// This function applies a very simplistic algorithm for NRVO: if every return 7082/// statement in the function has the same NRVO candidate, that candidate is 7083/// the NRVO variable. 7084/// 7085/// FIXME: Employ a smarter algorithm that accounts for multiple return 7086/// statements and the lifetimes of the NRVO candidates. We should be able to 7087/// find a maximal set of NRVO variables. 7088void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7089 ReturnStmt **Returns = Scope->Returns.data(); 7090 7091 const VarDecl *NRVOCandidate = 0; 7092 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7093 if (!Returns[I]->getNRVOCandidate()) 7094 return; 7095 7096 if (!NRVOCandidate) 7097 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7098 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7099 return; 7100 } 7101 7102 if (NRVOCandidate) 7103 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7104} 7105 7106Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7107 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7108} 7109 7110Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7111 bool IsInstantiation) { 7112 FunctionDecl *FD = 0; 7113 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7114 if (FunTmpl) 7115 FD = FunTmpl->getTemplatedDecl(); 7116 else 7117 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7118 7119 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7120 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7121 7122 if (FD) { 7123 FD->setBody(Body); 7124 if (FD->isMain()) { 7125 // C and C++ allow for main to automagically return 0. 7126 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7127 FD->setHasImplicitReturnZero(true); 7128 WP.disableCheckFallThrough(); 7129 } else if (FD->hasAttr<NakedAttr>()) { 7130 // If the function is marked 'naked', don't complain about missing return 7131 // statements. 7132 WP.disableCheckFallThrough(); 7133 } 7134 7135 // MSVC permits the use of pure specifier (=0) on function definition, 7136 // defined at class scope, warn about this non standard construct. 7137 if (getLangOptions().MicrosoftExt && FD->isPure()) 7138 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7139 7140 if (!FD->isInvalidDecl()) { 7141 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7142 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7143 FD->getResultType(), FD); 7144 7145 // If this is a constructor, we need a vtable. 7146 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7147 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7148 7149 computeNRVO(Body, getCurFunction()); 7150 } 7151 7152 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7153 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7154 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7155 MD->setBody(Body); 7156 if (Body) 7157 MD->setEndLoc(Body->getLocEnd()); 7158 if (!MD->isInvalidDecl()) { 7159 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7160 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7161 MD->getResultType(), MD); 7162 7163 if (Body) 7164 computeNRVO(Body, getCurFunction()); 7165 } 7166 if (ObjCShouldCallSuperDealloc) { 7167 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7168 ObjCShouldCallSuperDealloc = false; 7169 } 7170 if (ObjCShouldCallSuperFinalize) { 7171 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7172 ObjCShouldCallSuperFinalize = false; 7173 } 7174 } else { 7175 return 0; 7176 } 7177 7178 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7179 "ObjC methods, which should have been handled in the block above."); 7180 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7181 "ObjC methods, which should have been handled in the block above."); 7182 7183 // Verify and clean out per-function state. 7184 if (Body) { 7185 // C++ constructors that have function-try-blocks can't have return 7186 // statements in the handlers of that block. (C++ [except.handle]p14) 7187 // Verify this. 7188 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7189 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7190 7191 // Verify that gotos and switch cases don't jump into scopes illegally. 7192 if (getCurFunction()->NeedsScopeChecking() && 7193 !dcl->isInvalidDecl() && 7194 !hasAnyUnrecoverableErrorsInThisFunction()) 7195 DiagnoseInvalidJumps(Body); 7196 7197 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7198 if (!Destructor->getParent()->isDependentType()) 7199 CheckDestructor(Destructor); 7200 7201 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7202 Destructor->getParent()); 7203 } 7204 7205 // If any errors have occurred, clear out any temporaries that may have 7206 // been leftover. This ensures that these temporaries won't be picked up for 7207 // deletion in some later function. 7208 if (PP.getDiagnostics().hasErrorOccurred() || 7209 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7210 DiscardCleanupsInEvaluationContext(); 7211 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7212 // Since the body is valid, issue any analysis-based warnings that are 7213 // enabled. 7214 ActivePolicy = &WP; 7215 } 7216 7217 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7218 !CheckConstexprFunctionBody(FD, Body)) 7219 FD->setInvalidDecl(); 7220 7221 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7222 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7223 } 7224 7225 if (!IsInstantiation) 7226 PopDeclContext(); 7227 7228 PopFunctionOrBlockScope(ActivePolicy, dcl); 7229 7230 // If any errors have occurred, clear out any temporaries that may have 7231 // been leftover. This ensures that these temporaries won't be picked up for 7232 // deletion in some later function. 7233 if (getDiagnostics().hasErrorOccurred()) { 7234 DiscardCleanupsInEvaluationContext(); 7235 } 7236 7237 return dcl; 7238} 7239 7240 7241/// When we finish delayed parsing of an attribute, we must attach it to the 7242/// relevant Decl. 7243void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7244 ParsedAttributes &Attrs) { 7245 ProcessDeclAttributeList(S, D, Attrs.getList()); 7246} 7247 7248 7249/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7250/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7251NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7252 IdentifierInfo &II, Scope *S) { 7253 // Before we produce a declaration for an implicitly defined 7254 // function, see whether there was a locally-scoped declaration of 7255 // this name as a function or variable. If so, use that 7256 // (non-visible) declaration, and complain about it. 7257 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7258 = findLocallyScopedExternalDecl(&II); 7259 if (Pos != LocallyScopedExternalDecls.end()) { 7260 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7261 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7262 return Pos->second; 7263 } 7264 7265 // See if we can find a typo correction. 7266 TypoCorrection Corrected; 7267 FunctionDecl *Func = 0; 7268 std::string CorrectedStr; 7269 std::string CorrectedQuotedStr; 7270 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7271 LookupOrdinaryName, S, 0))) { 7272 // Since this is an implicit function declaration, we are only 7273 // interested in a potential typo for a function name. 7274 if ((Func = dyn_cast_or_null<FunctionDecl>( 7275 Corrected.getCorrectionDecl()))) { 7276 CorrectedStr = Corrected.getAsString(getLangOptions()); 7277 CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7278 } 7279 } 7280 7281 // Extension in C99. Legal in C90, but warn about it. 7282 if (II.getName().startswith("__builtin_")) 7283 Diag(Loc, diag::err_builtin_unknown) << &II; 7284 else if (getLangOptions().C99) 7285 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7286 else 7287 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7288 7289 if (Func) { 7290 // If we found a typo correction, then suggest that. 7291 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7292 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7293 if (Func->getLocation().isValid() && !II.getName().startswith("__builtin_")) 7294 Diag(Func->getLocation(), diag::note_previous_decl) << CorrectedQuotedStr; 7295 } 7296 7297 // Set a Declarator for the implicit definition: int foo(); 7298 const char *Dummy; 7299 AttributeFactory attrFactory; 7300 DeclSpec DS(attrFactory); 7301 unsigned DiagID; 7302 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7303 (void)Error; // Silence warning. 7304 assert(!Error && "Error setting up implicit decl!"); 7305 Declarator D(DS, Declarator::BlockContext); 7306 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7307 0, 0, true, SourceLocation(), 7308 SourceLocation(), SourceLocation(), 7309 SourceLocation(), 7310 EST_None, SourceLocation(), 7311 0, 0, 0, 0, Loc, Loc, D), 7312 DS.getAttributes(), 7313 SourceLocation()); 7314 D.SetIdentifier(&II, Loc); 7315 7316 // Insert this function into translation-unit scope. 7317 7318 DeclContext *PrevDC = CurContext; 7319 CurContext = Context.getTranslationUnitDecl(); 7320 7321 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7322 FD->setImplicit(); 7323 7324 CurContext = PrevDC; 7325 7326 AddKnownFunctionAttributes(FD); 7327 7328 return FD; 7329} 7330 7331/// \brief Adds any function attributes that we know a priori based on 7332/// the declaration of this function. 7333/// 7334/// These attributes can apply both to implicitly-declared builtins 7335/// (like __builtin___printf_chk) or to library-declared functions 7336/// like NSLog or printf. 7337/// 7338/// We need to check for duplicate attributes both here and where user-written 7339/// attributes are applied to declarations. 7340void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7341 if (FD->isInvalidDecl()) 7342 return; 7343 7344 // If this is a built-in function, map its builtin attributes to 7345 // actual attributes. 7346 if (unsigned BuiltinID = FD->getBuiltinID()) { 7347 // Handle printf-formatting attributes. 7348 unsigned FormatIdx; 7349 bool HasVAListArg; 7350 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7351 if (!FD->getAttr<FormatAttr>()) 7352 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7353 "printf", FormatIdx+1, 7354 HasVAListArg ? 0 : FormatIdx+2)); 7355 } 7356 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7357 HasVAListArg)) { 7358 if (!FD->getAttr<FormatAttr>()) 7359 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7360 "scanf", FormatIdx+1, 7361 HasVAListArg ? 0 : FormatIdx+2)); 7362 } 7363 7364 // Mark const if we don't care about errno and that is the only 7365 // thing preventing the function from being const. This allows 7366 // IRgen to use LLVM intrinsics for such functions. 7367 if (!getLangOptions().MathErrno && 7368 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7369 if (!FD->getAttr<ConstAttr>()) 7370 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7371 } 7372 7373 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7374 !FD->getAttr<ReturnsTwiceAttr>()) 7375 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7376 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7377 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7378 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7379 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7380 } 7381 7382 IdentifierInfo *Name = FD->getIdentifier(); 7383 if (!Name) 7384 return; 7385 if ((!getLangOptions().CPlusPlus && 7386 FD->getDeclContext()->isTranslationUnit()) || 7387 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7388 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7389 LinkageSpecDecl::lang_c)) { 7390 // Okay: this could be a libc/libm/Objective-C function we know 7391 // about. 7392 } else 7393 return; 7394 7395 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7396 // FIXME: NSLog and NSLogv should be target specific 7397 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7398 // FIXME: We known better than our headers. 7399 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7400 } else 7401 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7402 "printf", 1, 7403 Name->isStr("NSLogv") ? 0 : 2)); 7404 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7405 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7406 // target-specific builtins, perhaps? 7407 if (!FD->getAttr<FormatAttr>()) 7408 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7409 "printf", 2, 7410 Name->isStr("vasprintf") ? 0 : 3)); 7411 } 7412} 7413 7414TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7415 TypeSourceInfo *TInfo) { 7416 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7417 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7418 7419 if (!TInfo) { 7420 assert(D.isInvalidType() && "no declarator info for valid type"); 7421 TInfo = Context.getTrivialTypeSourceInfo(T); 7422 } 7423 7424 // Scope manipulation handled by caller. 7425 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7426 D.getSourceRange().getBegin(), 7427 D.getIdentifierLoc(), 7428 D.getIdentifier(), 7429 TInfo); 7430 7431 // Bail out immediately if we have an invalid declaration. 7432 if (D.isInvalidType()) { 7433 NewTD->setInvalidDecl(); 7434 return NewTD; 7435 } 7436 7437 if (D.getDeclSpec().isModulePrivateSpecified()) { 7438 if (CurContext->isFunctionOrMethod()) 7439 Diag(NewTD->getLocation(), diag::err_module_private_local) 7440 << 2 << NewTD->getDeclName() 7441 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7442 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7443 else 7444 NewTD->setModulePrivate(); 7445 } 7446 7447 // C++ [dcl.typedef]p8: 7448 // If the typedef declaration defines an unnamed class (or 7449 // enum), the first typedef-name declared by the declaration 7450 // to be that class type (or enum type) is used to denote the 7451 // class type (or enum type) for linkage purposes only. 7452 // We need to check whether the type was declared in the declaration. 7453 switch (D.getDeclSpec().getTypeSpecType()) { 7454 case TST_enum: 7455 case TST_struct: 7456 case TST_union: 7457 case TST_class: { 7458 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7459 7460 // Do nothing if the tag is not anonymous or already has an 7461 // associated typedef (from an earlier typedef in this decl group). 7462 if (tagFromDeclSpec->getIdentifier()) break; 7463 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7464 7465 // A well-formed anonymous tag must always be a TUK_Definition. 7466 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7467 7468 // The type must match the tag exactly; no qualifiers allowed. 7469 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7470 break; 7471 7472 // Otherwise, set this is the anon-decl typedef for the tag. 7473 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7474 break; 7475 } 7476 7477 default: 7478 break; 7479 } 7480 7481 return NewTD; 7482} 7483 7484 7485/// \brief Determine whether a tag with a given kind is acceptable 7486/// as a redeclaration of the given tag declaration. 7487/// 7488/// \returns true if the new tag kind is acceptable, false otherwise. 7489bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7490 TagTypeKind NewTag, bool isDefinition, 7491 SourceLocation NewTagLoc, 7492 const IdentifierInfo &Name) { 7493 // C++ [dcl.type.elab]p3: 7494 // The class-key or enum keyword present in the 7495 // elaborated-type-specifier shall agree in kind with the 7496 // declaration to which the name in the elaborated-type-specifier 7497 // refers. This rule also applies to the form of 7498 // elaborated-type-specifier that declares a class-name or 7499 // friend class since it can be construed as referring to the 7500 // definition of the class. Thus, in any 7501 // elaborated-type-specifier, the enum keyword shall be used to 7502 // refer to an enumeration (7.2), the union class-key shall be 7503 // used to refer to a union (clause 9), and either the class or 7504 // struct class-key shall be used to refer to a class (clause 9) 7505 // declared using the class or struct class-key. 7506 TagTypeKind OldTag = Previous->getTagKind(); 7507 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7508 if (OldTag == NewTag) 7509 return true; 7510 7511 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7512 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7513 // Warn about the struct/class tag mismatch. 7514 bool isTemplate = false; 7515 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7516 isTemplate = Record->getDescribedClassTemplate(); 7517 7518 if (!ActiveTemplateInstantiations.empty()) { 7519 // In a template instantiation, do not offer fix-its for tag mismatches 7520 // since they usually mess up the template instead of fixing the problem. 7521 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7522 << (NewTag == TTK_Class) << isTemplate << &Name; 7523 return true; 7524 } 7525 7526 if (isDefinition) { 7527 // On definitions, check previous tags and issue a fix-it for each 7528 // one that doesn't match the current tag. 7529 if (Previous->getDefinition()) { 7530 // Don't suggest fix-its for redefinitions. 7531 return true; 7532 } 7533 7534 bool previousMismatch = false; 7535 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7536 E(Previous->redecls_end()); I != E; ++I) { 7537 if (I->getTagKind() != NewTag) { 7538 if (!previousMismatch) { 7539 previousMismatch = true; 7540 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7541 << (NewTag == TTK_Class) << isTemplate << &Name; 7542 } 7543 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7544 << (NewTag == TTK_Class) 7545 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7546 NewTag == TTK_Class? 7547 "class" : "struct"); 7548 } 7549 } 7550 return true; 7551 } 7552 7553 // Check for a previous definition. If current tag and definition 7554 // are same type, do nothing. If no definition, but disagree with 7555 // with previous tag type, give a warning, but no fix-it. 7556 const TagDecl *Redecl = Previous->getDefinition() ? 7557 Previous->getDefinition() : Previous; 7558 if (Redecl->getTagKind() == NewTag) { 7559 return true; 7560 } 7561 7562 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7563 << (NewTag == TTK_Class) 7564 << isTemplate << &Name; 7565 Diag(Redecl->getLocation(), diag::note_previous_use); 7566 7567 // If there is a previous defintion, suggest a fix-it. 7568 if (Previous->getDefinition()) { 7569 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7570 << (Redecl->getTagKind() == TTK_Class) 7571 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7572 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7573 } 7574 7575 return true; 7576 } 7577 return false; 7578} 7579 7580/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7581/// former case, Name will be non-null. In the later case, Name will be null. 7582/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7583/// reference/declaration/definition of a tag. 7584Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7585 SourceLocation KWLoc, CXXScopeSpec &SS, 7586 IdentifierInfo *Name, SourceLocation NameLoc, 7587 AttributeList *Attr, AccessSpecifier AS, 7588 SourceLocation ModulePrivateLoc, 7589 MultiTemplateParamsArg TemplateParameterLists, 7590 bool &OwnedDecl, bool &IsDependent, 7591 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7592 TypeResult UnderlyingType) { 7593 // If this is not a definition, it must have a name. 7594 assert((Name != 0 || TUK == TUK_Definition) && 7595 "Nameless record must be a definition!"); 7596 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7597 7598 OwnedDecl = false; 7599 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7600 7601 // FIXME: Check explicit specializations more carefully. 7602 bool isExplicitSpecialization = false; 7603 bool Invalid = false; 7604 7605 // We only need to do this matching if we have template parameters 7606 // or a scope specifier, which also conveniently avoids this work 7607 // for non-C++ cases. 7608 if (TemplateParameterLists.size() > 0 || 7609 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7610 if (TemplateParameterList *TemplateParams 7611 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7612 TemplateParameterLists.get(), 7613 TemplateParameterLists.size(), 7614 TUK == TUK_Friend, 7615 isExplicitSpecialization, 7616 Invalid)) { 7617 if (TemplateParams->size() > 0) { 7618 // This is a declaration or definition of a class template (which may 7619 // be a member of another template). 7620 7621 if (Invalid) 7622 return 0; 7623 7624 OwnedDecl = false; 7625 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7626 SS, Name, NameLoc, Attr, 7627 TemplateParams, AS, 7628 ModulePrivateLoc, 7629 TemplateParameterLists.size() - 1, 7630 (TemplateParameterList**) TemplateParameterLists.release()); 7631 return Result.get(); 7632 } else { 7633 // The "template<>" header is extraneous. 7634 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7635 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7636 isExplicitSpecialization = true; 7637 } 7638 } 7639 } 7640 7641 // Figure out the underlying type if this a enum declaration. We need to do 7642 // this early, because it's needed to detect if this is an incompatible 7643 // redeclaration. 7644 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7645 7646 if (Kind == TTK_Enum) { 7647 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7648 // No underlying type explicitly specified, or we failed to parse the 7649 // type, default to int. 7650 EnumUnderlying = Context.IntTy.getTypePtr(); 7651 else if (UnderlyingType.get()) { 7652 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7653 // integral type; any cv-qualification is ignored. 7654 TypeSourceInfo *TI = 0; 7655 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7656 EnumUnderlying = TI; 7657 7658 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7659 7660 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7661 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7662 << T; 7663 // Recover by falling back to int. 7664 EnumUnderlying = Context.IntTy.getTypePtr(); 7665 } 7666 7667 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7668 UPPC_FixedUnderlyingType)) 7669 EnumUnderlying = Context.IntTy.getTypePtr(); 7670 7671 } else if (getLangOptions().MicrosoftExt) 7672 // Microsoft enums are always of int type. 7673 EnumUnderlying = Context.IntTy.getTypePtr(); 7674 } 7675 7676 DeclContext *SearchDC = CurContext; 7677 DeclContext *DC = CurContext; 7678 bool isStdBadAlloc = false; 7679 7680 RedeclarationKind Redecl = ForRedeclaration; 7681 if (TUK == TUK_Friend || TUK == TUK_Reference) 7682 Redecl = NotForRedeclaration; 7683 7684 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7685 7686 if (Name && SS.isNotEmpty()) { 7687 // We have a nested-name tag ('struct foo::bar'). 7688 7689 // Check for invalid 'foo::'. 7690 if (SS.isInvalid()) { 7691 Name = 0; 7692 goto CreateNewDecl; 7693 } 7694 7695 // If this is a friend or a reference to a class in a dependent 7696 // context, don't try to make a decl for it. 7697 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7698 DC = computeDeclContext(SS, false); 7699 if (!DC) { 7700 IsDependent = true; 7701 return 0; 7702 } 7703 } else { 7704 DC = computeDeclContext(SS, true); 7705 if (!DC) { 7706 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7707 << SS.getRange(); 7708 return 0; 7709 } 7710 } 7711 7712 if (RequireCompleteDeclContext(SS, DC)) 7713 return 0; 7714 7715 SearchDC = DC; 7716 // Look-up name inside 'foo::'. 7717 LookupQualifiedName(Previous, DC); 7718 7719 if (Previous.isAmbiguous()) 7720 return 0; 7721 7722 if (Previous.empty()) { 7723 // Name lookup did not find anything. However, if the 7724 // nested-name-specifier refers to the current instantiation, 7725 // and that current instantiation has any dependent base 7726 // classes, we might find something at instantiation time: treat 7727 // this as a dependent elaborated-type-specifier. 7728 // But this only makes any sense for reference-like lookups. 7729 if (Previous.wasNotFoundInCurrentInstantiation() && 7730 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7731 IsDependent = true; 7732 return 0; 7733 } 7734 7735 // A tag 'foo::bar' must already exist. 7736 Diag(NameLoc, diag::err_not_tag_in_scope) 7737 << Kind << Name << DC << SS.getRange(); 7738 Name = 0; 7739 Invalid = true; 7740 goto CreateNewDecl; 7741 } 7742 } else if (Name) { 7743 // If this is a named struct, check to see if there was a previous forward 7744 // declaration or definition. 7745 // FIXME: We're looking into outer scopes here, even when we 7746 // shouldn't be. Doing so can result in ambiguities that we 7747 // shouldn't be diagnosing. 7748 LookupName(Previous, S); 7749 7750 if (Previous.isAmbiguous() && 7751 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7752 LookupResult::Filter F = Previous.makeFilter(); 7753 while (F.hasNext()) { 7754 NamedDecl *ND = F.next(); 7755 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7756 F.erase(); 7757 } 7758 F.done(); 7759 } 7760 7761 // Note: there used to be some attempt at recovery here. 7762 if (Previous.isAmbiguous()) 7763 return 0; 7764 7765 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7766 // FIXME: This makes sure that we ignore the contexts associated 7767 // with C structs, unions, and enums when looking for a matching 7768 // tag declaration or definition. See the similar lookup tweak 7769 // in Sema::LookupName; is there a better way to deal with this? 7770 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7771 SearchDC = SearchDC->getParent(); 7772 } 7773 } else if (S->isFunctionPrototypeScope()) { 7774 // If this is an enum declaration in function prototype scope, set its 7775 // initial context to the translation unit. 7776 SearchDC = Context.getTranslationUnitDecl(); 7777 } 7778 7779 if (Previous.isSingleResult() && 7780 Previous.getFoundDecl()->isTemplateParameter()) { 7781 // Maybe we will complain about the shadowed template parameter. 7782 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7783 // Just pretend that we didn't see the previous declaration. 7784 Previous.clear(); 7785 } 7786 7787 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7788 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7789 // This is a declaration of or a reference to "std::bad_alloc". 7790 isStdBadAlloc = true; 7791 7792 if (Previous.empty() && StdBadAlloc) { 7793 // std::bad_alloc has been implicitly declared (but made invisible to 7794 // name lookup). Fill in this implicit declaration as the previous 7795 // declaration, so that the declarations get chained appropriately. 7796 Previous.addDecl(getStdBadAlloc()); 7797 } 7798 } 7799 7800 // If we didn't find a previous declaration, and this is a reference 7801 // (or friend reference), move to the correct scope. In C++, we 7802 // also need to do a redeclaration lookup there, just in case 7803 // there's a shadow friend decl. 7804 if (Name && Previous.empty() && 7805 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7806 if (Invalid) goto CreateNewDecl; 7807 assert(SS.isEmpty()); 7808 7809 if (TUK == TUK_Reference) { 7810 // C++ [basic.scope.pdecl]p5: 7811 // -- for an elaborated-type-specifier of the form 7812 // 7813 // class-key identifier 7814 // 7815 // if the elaborated-type-specifier is used in the 7816 // decl-specifier-seq or parameter-declaration-clause of a 7817 // function defined in namespace scope, the identifier is 7818 // declared as a class-name in the namespace that contains 7819 // the declaration; otherwise, except as a friend 7820 // declaration, the identifier is declared in the smallest 7821 // non-class, non-function-prototype scope that contains the 7822 // declaration. 7823 // 7824 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7825 // C structs and unions. 7826 // 7827 // It is an error in C++ to declare (rather than define) an enum 7828 // type, including via an elaborated type specifier. We'll 7829 // diagnose that later; for now, declare the enum in the same 7830 // scope as we would have picked for any other tag type. 7831 // 7832 // GNU C also supports this behavior as part of its incomplete 7833 // enum types extension, while GNU C++ does not. 7834 // 7835 // Find the context where we'll be declaring the tag. 7836 // FIXME: We would like to maintain the current DeclContext as the 7837 // lexical context, 7838 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7839 SearchDC = SearchDC->getParent(); 7840 7841 // Find the scope where we'll be declaring the tag. 7842 while (S->isClassScope() || 7843 (getLangOptions().CPlusPlus && 7844 S->isFunctionPrototypeScope()) || 7845 ((S->getFlags() & Scope::DeclScope) == 0) || 7846 (S->getEntity() && 7847 ((DeclContext *)S->getEntity())->isTransparentContext())) 7848 S = S->getParent(); 7849 } else { 7850 assert(TUK == TUK_Friend); 7851 // C++ [namespace.memdef]p3: 7852 // If a friend declaration in a non-local class first declares a 7853 // class or function, the friend class or function is a member of 7854 // the innermost enclosing namespace. 7855 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7856 } 7857 7858 // In C++, we need to do a redeclaration lookup to properly 7859 // diagnose some problems. 7860 if (getLangOptions().CPlusPlus) { 7861 Previous.setRedeclarationKind(ForRedeclaration); 7862 LookupQualifiedName(Previous, SearchDC); 7863 } 7864 } 7865 7866 if (!Previous.empty()) { 7867 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7868 7869 // It's okay to have a tag decl in the same scope as a typedef 7870 // which hides a tag decl in the same scope. Finding this 7871 // insanity with a redeclaration lookup can only actually happen 7872 // in C++. 7873 // 7874 // This is also okay for elaborated-type-specifiers, which is 7875 // technically forbidden by the current standard but which is 7876 // okay according to the likely resolution of an open issue; 7877 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7878 if (getLangOptions().CPlusPlus) { 7879 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7880 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7881 TagDecl *Tag = TT->getDecl(); 7882 if (Tag->getDeclName() == Name && 7883 Tag->getDeclContext()->getRedeclContext() 7884 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7885 PrevDecl = Tag; 7886 Previous.clear(); 7887 Previous.addDecl(Tag); 7888 Previous.resolveKind(); 7889 } 7890 } 7891 } 7892 } 7893 7894 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7895 // If this is a use of a previous tag, or if the tag is already declared 7896 // in the same scope (so that the definition/declaration completes or 7897 // rementions the tag), reuse the decl. 7898 if (TUK == TUK_Reference || TUK == TUK_Friend || 7899 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7900 // Make sure that this wasn't declared as an enum and now used as a 7901 // struct or something similar. 7902 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7903 TUK == TUK_Definition, KWLoc, 7904 *Name)) { 7905 bool SafeToContinue 7906 = (PrevTagDecl->getTagKind() != TTK_Enum && 7907 Kind != TTK_Enum); 7908 if (SafeToContinue) 7909 Diag(KWLoc, diag::err_use_with_wrong_tag) 7910 << Name 7911 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7912 PrevTagDecl->getKindName()); 7913 else 7914 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7915 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7916 7917 if (SafeToContinue) 7918 Kind = PrevTagDecl->getTagKind(); 7919 else { 7920 // Recover by making this an anonymous redefinition. 7921 Name = 0; 7922 Previous.clear(); 7923 Invalid = true; 7924 } 7925 } 7926 7927 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7928 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7929 7930 // All conflicts with previous declarations are recovered by 7931 // returning the previous declaration. 7932 if (ScopedEnum != PrevEnum->isScoped()) { 7933 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7934 << PrevEnum->isScoped(); 7935 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7936 return PrevTagDecl; 7937 } 7938 else if (EnumUnderlying && PrevEnum->isFixed()) { 7939 QualType T; 7940 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7941 T = TI->getType(); 7942 else 7943 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7944 7945 if (!Context.hasSameUnqualifiedType(T, 7946 PrevEnum->getIntegerType())) { 7947 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7948 diag::err_enum_redeclare_type_mismatch) 7949 << T 7950 << PrevEnum->getIntegerType(); 7951 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7952 return PrevTagDecl; 7953 } 7954 } 7955 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7956 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7957 << PrevEnum->isFixed(); 7958 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7959 return PrevTagDecl; 7960 } 7961 } 7962 7963 if (!Invalid) { 7964 // If this is a use, just return the declaration we found. 7965 7966 // FIXME: In the future, return a variant or some other clue 7967 // for the consumer of this Decl to know it doesn't own it. 7968 // For our current ASTs this shouldn't be a problem, but will 7969 // need to be changed with DeclGroups. 7970 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7971 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7972 return PrevTagDecl; 7973 7974 // Diagnose attempts to redefine a tag. 7975 if (TUK == TUK_Definition) { 7976 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7977 // If we're defining a specialization and the previous definition 7978 // is from an implicit instantiation, don't emit an error 7979 // here; we'll catch this in the general case below. 7980 if (!isExplicitSpecialization || 7981 !isa<CXXRecordDecl>(Def) || 7982 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7983 == TSK_ExplicitSpecialization) { 7984 Diag(NameLoc, diag::err_redefinition) << Name; 7985 Diag(Def->getLocation(), diag::note_previous_definition); 7986 // If this is a redefinition, recover by making this 7987 // struct be anonymous, which will make any later 7988 // references get the previous definition. 7989 Name = 0; 7990 Previous.clear(); 7991 Invalid = true; 7992 } 7993 } else { 7994 // If the type is currently being defined, complain 7995 // about a nested redefinition. 7996 const TagType *Tag 7997 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7998 if (Tag->isBeingDefined()) { 7999 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8000 Diag(PrevTagDecl->getLocation(), 8001 diag::note_previous_definition); 8002 Name = 0; 8003 Previous.clear(); 8004 Invalid = true; 8005 } 8006 } 8007 8008 // Okay, this is definition of a previously declared or referenced 8009 // tag PrevDecl. We're going to create a new Decl for it. 8010 } 8011 } 8012 // If we get here we have (another) forward declaration or we 8013 // have a definition. Just create a new decl. 8014 8015 } else { 8016 // If we get here, this is a definition of a new tag type in a nested 8017 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8018 // new decl/type. We set PrevDecl to NULL so that the entities 8019 // have distinct types. 8020 Previous.clear(); 8021 } 8022 // If we get here, we're going to create a new Decl. If PrevDecl 8023 // is non-NULL, it's a definition of the tag declared by 8024 // PrevDecl. If it's NULL, we have a new definition. 8025 8026 8027 // Otherwise, PrevDecl is not a tag, but was found with tag 8028 // lookup. This is only actually possible in C++, where a few 8029 // things like templates still live in the tag namespace. 8030 } else { 8031 assert(getLangOptions().CPlusPlus); 8032 8033 // Use a better diagnostic if an elaborated-type-specifier 8034 // found the wrong kind of type on the first 8035 // (non-redeclaration) lookup. 8036 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8037 !Previous.isForRedeclaration()) { 8038 unsigned Kind = 0; 8039 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8040 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8041 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8042 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8043 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8044 Invalid = true; 8045 8046 // Otherwise, only diagnose if the declaration is in scope. 8047 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8048 isExplicitSpecialization)) { 8049 // do nothing 8050 8051 // Diagnose implicit declarations introduced by elaborated types. 8052 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8053 unsigned Kind = 0; 8054 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8055 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8056 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8057 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8058 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8059 Invalid = true; 8060 8061 // Otherwise it's a declaration. Call out a particularly common 8062 // case here. 8063 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8064 unsigned Kind = 0; 8065 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8066 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8067 << Name << Kind << TND->getUnderlyingType(); 8068 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8069 Invalid = true; 8070 8071 // Otherwise, diagnose. 8072 } else { 8073 // The tag name clashes with something else in the target scope, 8074 // issue an error and recover by making this tag be anonymous. 8075 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8076 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8077 Name = 0; 8078 Invalid = true; 8079 } 8080 8081 // The existing declaration isn't relevant to us; we're in a 8082 // new scope, so clear out the previous declaration. 8083 Previous.clear(); 8084 } 8085 } 8086 8087CreateNewDecl: 8088 8089 TagDecl *PrevDecl = 0; 8090 if (Previous.isSingleResult()) 8091 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8092 8093 // If there is an identifier, use the location of the identifier as the 8094 // location of the decl, otherwise use the location of the struct/union 8095 // keyword. 8096 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8097 8098 // Otherwise, create a new declaration. If there is a previous 8099 // declaration of the same entity, the two will be linked via 8100 // PrevDecl. 8101 TagDecl *New; 8102 8103 bool IsForwardReference = false; 8104 if (Kind == TTK_Enum) { 8105 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8106 // enum X { A, B, C } D; D should chain to X. 8107 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8108 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8109 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8110 // If this is an undefined enum, warn. 8111 if (TUK != TUK_Definition && !Invalid) { 8112 TagDecl *Def; 8113 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8114 // C++0x: 7.2p2: opaque-enum-declaration. 8115 // Conflicts are diagnosed above. Do nothing. 8116 } 8117 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8118 Diag(Loc, diag::ext_forward_ref_enum_def) 8119 << New; 8120 Diag(Def->getLocation(), diag::note_previous_definition); 8121 } else { 8122 unsigned DiagID = diag::ext_forward_ref_enum; 8123 if (getLangOptions().MicrosoftExt) 8124 DiagID = diag::ext_ms_forward_ref_enum; 8125 else if (getLangOptions().CPlusPlus) 8126 DiagID = diag::err_forward_ref_enum; 8127 Diag(Loc, DiagID); 8128 8129 // If this is a forward-declared reference to an enumeration, make a 8130 // note of it; we won't actually be introducing the declaration into 8131 // the declaration context. 8132 if (TUK == TUK_Reference) 8133 IsForwardReference = true; 8134 } 8135 } 8136 8137 if (EnumUnderlying) { 8138 EnumDecl *ED = cast<EnumDecl>(New); 8139 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8140 ED->setIntegerTypeSourceInfo(TI); 8141 else 8142 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8143 ED->setPromotionType(ED->getIntegerType()); 8144 } 8145 8146 } else { 8147 // struct/union/class 8148 8149 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8150 // struct X { int A; } D; D should chain to X. 8151 if (getLangOptions().CPlusPlus) { 8152 // FIXME: Look for a way to use RecordDecl for simple structs. 8153 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8154 cast_or_null<CXXRecordDecl>(PrevDecl)); 8155 8156 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8157 StdBadAlloc = cast<CXXRecordDecl>(New); 8158 } else 8159 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8160 cast_or_null<RecordDecl>(PrevDecl)); 8161 } 8162 8163 // Maybe add qualifier info. 8164 if (SS.isNotEmpty()) { 8165 if (SS.isSet()) { 8166 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8167 if (TemplateParameterLists.size() > 0) { 8168 New->setTemplateParameterListsInfo(Context, 8169 TemplateParameterLists.size(), 8170 (TemplateParameterList**) TemplateParameterLists.release()); 8171 } 8172 } 8173 else 8174 Invalid = true; 8175 } 8176 8177 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8178 // Add alignment attributes if necessary; these attributes are checked when 8179 // the ASTContext lays out the structure. 8180 // 8181 // It is important for implementing the correct semantics that this 8182 // happen here (in act on tag decl). The #pragma pack stack is 8183 // maintained as a result of parser callbacks which can occur at 8184 // many points during the parsing of a struct declaration (because 8185 // the #pragma tokens are effectively skipped over during the 8186 // parsing of the struct). 8187 AddAlignmentAttributesForRecord(RD); 8188 8189 AddMsStructLayoutForRecord(RD); 8190 } 8191 8192 if (PrevDecl && PrevDecl->isModulePrivate()) 8193 New->setModulePrivate(); 8194 else if (ModulePrivateLoc.isValid()) { 8195 if (isExplicitSpecialization) 8196 Diag(New->getLocation(), diag::err_module_private_specialization) 8197 << 2 8198 << FixItHint::CreateRemoval(ModulePrivateLoc); 8199 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8200 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8201 // __module_private__ does not apply to local classes. However, we only 8202 // diagnose this as an error when the declaration specifiers are 8203 // freestanding. Here, we just ignore the __module_private__. 8204 // foobar 8205 else if (!SearchDC->isFunctionOrMethod()) 8206 New->setModulePrivate(); 8207 } 8208 8209 // If this is a specialization of a member class (of a class template), 8210 // check the specialization. 8211 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8212 Invalid = true; 8213 8214 if (Invalid) 8215 New->setInvalidDecl(); 8216 8217 if (Attr) 8218 ProcessDeclAttributeList(S, New, Attr); 8219 8220 // If we're declaring or defining a tag in function prototype scope 8221 // in C, note that this type can only be used within the function. 8222 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8223 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8224 8225 // Set the lexical context. If the tag has a C++ scope specifier, the 8226 // lexical context will be different from the semantic context. 8227 New->setLexicalDeclContext(CurContext); 8228 8229 // Mark this as a friend decl if applicable. 8230 // In Microsoft mode, a friend declaration also acts as a forward 8231 // declaration so we always pass true to setObjectOfFriendDecl to make 8232 // the tag name visible. 8233 if (TUK == TUK_Friend) 8234 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8235 getLangOptions().MicrosoftExt); 8236 8237 // Set the access specifier. 8238 if (!Invalid && SearchDC->isRecord()) 8239 SetMemberAccessSpecifier(New, PrevDecl, AS); 8240 8241 if (TUK == TUK_Definition) 8242 New->startDefinition(); 8243 8244 // If this has an identifier, add it to the scope stack. 8245 if (TUK == TUK_Friend) { 8246 // We might be replacing an existing declaration in the lookup tables; 8247 // if so, borrow its access specifier. 8248 if (PrevDecl) 8249 New->setAccess(PrevDecl->getAccess()); 8250 8251 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8252 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8253 if (Name) // can be null along some error paths 8254 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8255 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8256 } else if (Name) { 8257 S = getNonFieldDeclScope(S); 8258 PushOnScopeChains(New, S, !IsForwardReference); 8259 if (IsForwardReference) 8260 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8261 8262 } else { 8263 CurContext->addDecl(New); 8264 } 8265 8266 // If this is the C FILE type, notify the AST context. 8267 if (IdentifierInfo *II = New->getIdentifier()) 8268 if (!New->isInvalidDecl() && 8269 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8270 II->isStr("FILE")) 8271 Context.setFILEDecl(New); 8272 8273 OwnedDecl = true; 8274 return New; 8275} 8276 8277void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8278 AdjustDeclIfTemplate(TagD); 8279 TagDecl *Tag = cast<TagDecl>(TagD); 8280 8281 // Enter the tag context. 8282 PushDeclContext(S, Tag); 8283} 8284 8285Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8286 assert(isa<ObjCContainerDecl>(IDecl) && 8287 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8288 DeclContext *OCD = cast<DeclContext>(IDecl); 8289 assert(getContainingDC(OCD) == CurContext && 8290 "The next DeclContext should be lexically contained in the current one."); 8291 CurContext = OCD; 8292 return IDecl; 8293} 8294 8295void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8296 SourceLocation FinalLoc, 8297 SourceLocation LBraceLoc) { 8298 AdjustDeclIfTemplate(TagD); 8299 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8300 8301 FieldCollector->StartClass(); 8302 8303 if (!Record->getIdentifier()) 8304 return; 8305 8306 if (FinalLoc.isValid()) 8307 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8308 8309 // C++ [class]p2: 8310 // [...] The class-name is also inserted into the scope of the 8311 // class itself; this is known as the injected-class-name. For 8312 // purposes of access checking, the injected-class-name is treated 8313 // as if it were a public member name. 8314 CXXRecordDecl *InjectedClassName 8315 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8316 Record->getLocStart(), Record->getLocation(), 8317 Record->getIdentifier(), 8318 /*PrevDecl=*/0, 8319 /*DelayTypeCreation=*/true); 8320 Context.getTypeDeclType(InjectedClassName, Record); 8321 InjectedClassName->setImplicit(); 8322 InjectedClassName->setAccess(AS_public); 8323 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8324 InjectedClassName->setDescribedClassTemplate(Template); 8325 PushOnScopeChains(InjectedClassName, S); 8326 assert(InjectedClassName->isInjectedClassName() && 8327 "Broken injected-class-name"); 8328} 8329 8330void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8331 SourceLocation RBraceLoc) { 8332 AdjustDeclIfTemplate(TagD); 8333 TagDecl *Tag = cast<TagDecl>(TagD); 8334 Tag->setRBraceLoc(RBraceLoc); 8335 8336 if (isa<CXXRecordDecl>(Tag)) 8337 FieldCollector->FinishClass(); 8338 8339 // Exit this scope of this tag's definition. 8340 PopDeclContext(); 8341 8342 // Notify the consumer that we've defined a tag. 8343 Consumer.HandleTagDeclDefinition(Tag); 8344} 8345 8346void Sema::ActOnObjCContainerFinishDefinition() { 8347 // Exit this scope of this interface definition. 8348 PopDeclContext(); 8349} 8350 8351void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8352 assert(DC == CurContext && "Mismatch of container contexts"); 8353 OriginalLexicalContext = DC; 8354 ActOnObjCContainerFinishDefinition(); 8355} 8356 8357void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8358 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8359 OriginalLexicalContext = 0; 8360} 8361 8362void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8363 AdjustDeclIfTemplate(TagD); 8364 TagDecl *Tag = cast<TagDecl>(TagD); 8365 Tag->setInvalidDecl(); 8366 8367 // We're undoing ActOnTagStartDefinition here, not 8368 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8369 // the FieldCollector. 8370 8371 PopDeclContext(); 8372} 8373 8374// Note that FieldName may be null for anonymous bitfields. 8375bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8376 QualType FieldTy, const Expr *BitWidth, 8377 bool *ZeroWidth) { 8378 // Default to true; that shouldn't confuse checks for emptiness 8379 if (ZeroWidth) 8380 *ZeroWidth = true; 8381 8382 // C99 6.7.2.1p4 - verify the field type. 8383 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8384 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8385 // Handle incomplete types with specific error. 8386 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8387 return true; 8388 if (FieldName) 8389 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8390 << FieldName << FieldTy << BitWidth->getSourceRange(); 8391 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8392 << FieldTy << BitWidth->getSourceRange(); 8393 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8394 UPPC_BitFieldWidth)) 8395 return true; 8396 8397 // If the bit-width is type- or value-dependent, don't try to check 8398 // it now. 8399 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8400 return false; 8401 8402 llvm::APSInt Value; 8403 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8404 return true; 8405 8406 if (Value != 0 && ZeroWidth) 8407 *ZeroWidth = false; 8408 8409 // Zero-width bitfield is ok for anonymous field. 8410 if (Value == 0 && FieldName) 8411 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8412 8413 if (Value.isSigned() && Value.isNegative()) { 8414 if (FieldName) 8415 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8416 << FieldName << Value.toString(10); 8417 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8418 << Value.toString(10); 8419 } 8420 8421 if (!FieldTy->isDependentType()) { 8422 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8423 if (Value.getZExtValue() > TypeSize) { 8424 if (!getLangOptions().CPlusPlus) { 8425 if (FieldName) 8426 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8427 << FieldName << (unsigned)Value.getZExtValue() 8428 << (unsigned)TypeSize; 8429 8430 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8431 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8432 } 8433 8434 if (FieldName) 8435 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8436 << FieldName << (unsigned)Value.getZExtValue() 8437 << (unsigned)TypeSize; 8438 else 8439 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8440 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8441 } 8442 } 8443 8444 return false; 8445} 8446 8447/// ActOnField - Each field of a C struct/union is passed into this in order 8448/// to create a FieldDecl object for it. 8449Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8450 Declarator &D, Expr *BitfieldWidth) { 8451 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8452 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8453 /*HasInit=*/false, AS_public); 8454 return Res; 8455} 8456 8457/// HandleField - Analyze a field of a C struct or a C++ data member. 8458/// 8459FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8460 SourceLocation DeclStart, 8461 Declarator &D, Expr *BitWidth, bool HasInit, 8462 AccessSpecifier AS) { 8463 IdentifierInfo *II = D.getIdentifier(); 8464 SourceLocation Loc = DeclStart; 8465 if (II) Loc = D.getIdentifierLoc(); 8466 8467 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8468 QualType T = TInfo->getType(); 8469 if (getLangOptions().CPlusPlus) { 8470 CheckExtraCXXDefaultArguments(D); 8471 8472 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8473 UPPC_DataMemberType)) { 8474 D.setInvalidType(); 8475 T = Context.IntTy; 8476 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8477 } 8478 } 8479 8480 DiagnoseFunctionSpecifiers(D); 8481 8482 if (D.getDeclSpec().isThreadSpecified()) 8483 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8484 if (D.getDeclSpec().isConstexprSpecified()) 8485 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8486 << 2; 8487 8488 // Check to see if this name was declared as a member previously 8489 NamedDecl *PrevDecl = 0; 8490 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8491 LookupName(Previous, S); 8492 switch (Previous.getResultKind()) { 8493 case LookupResult::Found: 8494 case LookupResult::FoundUnresolvedValue: 8495 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8496 break; 8497 8498 case LookupResult::FoundOverloaded: 8499 PrevDecl = Previous.getRepresentativeDecl(); 8500 break; 8501 8502 case LookupResult::NotFound: 8503 case LookupResult::NotFoundInCurrentInstantiation: 8504 case LookupResult::Ambiguous: 8505 break; 8506 } 8507 Previous.suppressDiagnostics(); 8508 8509 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8510 // Maybe we will complain about the shadowed template parameter. 8511 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8512 // Just pretend that we didn't see the previous declaration. 8513 PrevDecl = 0; 8514 } 8515 8516 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8517 PrevDecl = 0; 8518 8519 bool Mutable 8520 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8521 SourceLocation TSSL = D.getSourceRange().getBegin(); 8522 FieldDecl *NewFD 8523 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8524 TSSL, AS, PrevDecl, &D); 8525 8526 if (NewFD->isInvalidDecl()) 8527 Record->setInvalidDecl(); 8528 8529 if (D.getDeclSpec().isModulePrivateSpecified()) 8530 NewFD->setModulePrivate(); 8531 8532 if (NewFD->isInvalidDecl() && PrevDecl) { 8533 // Don't introduce NewFD into scope; there's already something 8534 // with the same name in the same scope. 8535 } else if (II) { 8536 PushOnScopeChains(NewFD, S); 8537 } else 8538 Record->addDecl(NewFD); 8539 8540 return NewFD; 8541} 8542 8543/// \brief Build a new FieldDecl and check its well-formedness. 8544/// 8545/// This routine builds a new FieldDecl given the fields name, type, 8546/// record, etc. \p PrevDecl should refer to any previous declaration 8547/// with the same name and in the same scope as the field to be 8548/// created. 8549/// 8550/// \returns a new FieldDecl. 8551/// 8552/// \todo The Declarator argument is a hack. It will be removed once 8553FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8554 TypeSourceInfo *TInfo, 8555 RecordDecl *Record, SourceLocation Loc, 8556 bool Mutable, Expr *BitWidth, bool HasInit, 8557 SourceLocation TSSL, 8558 AccessSpecifier AS, NamedDecl *PrevDecl, 8559 Declarator *D) { 8560 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8561 bool InvalidDecl = false; 8562 if (D) InvalidDecl = D->isInvalidType(); 8563 8564 // If we receive a broken type, recover by assuming 'int' and 8565 // marking this declaration as invalid. 8566 if (T.isNull()) { 8567 InvalidDecl = true; 8568 T = Context.IntTy; 8569 } 8570 8571 QualType EltTy = Context.getBaseElementType(T); 8572 if (!EltTy->isDependentType() && 8573 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8574 // Fields of incomplete type force their record to be invalid. 8575 Record->setInvalidDecl(); 8576 InvalidDecl = true; 8577 } 8578 8579 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8580 // than a variably modified type. 8581 if (!InvalidDecl && T->isVariablyModifiedType()) { 8582 bool SizeIsNegative; 8583 llvm::APSInt Oversized; 8584 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8585 SizeIsNegative, 8586 Oversized); 8587 if (!FixedTy.isNull()) { 8588 Diag(Loc, diag::warn_illegal_constant_array_size); 8589 T = FixedTy; 8590 } else { 8591 if (SizeIsNegative) 8592 Diag(Loc, diag::err_typecheck_negative_array_size); 8593 else if (Oversized.getBoolValue()) 8594 Diag(Loc, diag::err_array_too_large) 8595 << Oversized.toString(10); 8596 else 8597 Diag(Loc, diag::err_typecheck_field_variable_size); 8598 InvalidDecl = true; 8599 } 8600 } 8601 8602 // Fields can not have abstract class types 8603 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8604 diag::err_abstract_type_in_decl, 8605 AbstractFieldType)) 8606 InvalidDecl = true; 8607 8608 bool ZeroWidth = false; 8609 // If this is declared as a bit-field, check the bit-field. 8610 if (!InvalidDecl && BitWidth && 8611 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8612 InvalidDecl = true; 8613 BitWidth = 0; 8614 ZeroWidth = false; 8615 } 8616 8617 // Check that 'mutable' is consistent with the type of the declaration. 8618 if (!InvalidDecl && Mutable) { 8619 unsigned DiagID = 0; 8620 if (T->isReferenceType()) 8621 DiagID = diag::err_mutable_reference; 8622 else if (T.isConstQualified()) 8623 DiagID = diag::err_mutable_const; 8624 8625 if (DiagID) { 8626 SourceLocation ErrLoc = Loc; 8627 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8628 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8629 Diag(ErrLoc, DiagID); 8630 Mutable = false; 8631 InvalidDecl = true; 8632 } 8633 } 8634 8635 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8636 BitWidth, Mutable, HasInit); 8637 if (InvalidDecl) 8638 NewFD->setInvalidDecl(); 8639 8640 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8641 Diag(Loc, diag::err_duplicate_member) << II; 8642 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8643 NewFD->setInvalidDecl(); 8644 } 8645 8646 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8647 if (Record->isUnion()) { 8648 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8649 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8650 if (RDecl->getDefinition()) { 8651 // C++ [class.union]p1: An object of a class with a non-trivial 8652 // constructor, a non-trivial copy constructor, a non-trivial 8653 // destructor, or a non-trivial copy assignment operator 8654 // cannot be a member of a union, nor can an array of such 8655 // objects. 8656 if (CheckNontrivialField(NewFD)) 8657 NewFD->setInvalidDecl(); 8658 } 8659 } 8660 8661 // C++ [class.union]p1: If a union contains a member of reference type, 8662 // the program is ill-formed. 8663 if (EltTy->isReferenceType()) { 8664 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8665 << NewFD->getDeclName() << EltTy; 8666 NewFD->setInvalidDecl(); 8667 } 8668 } 8669 } 8670 8671 // FIXME: We need to pass in the attributes given an AST 8672 // representation, not a parser representation. 8673 if (D) 8674 // FIXME: What to pass instead of TUScope? 8675 ProcessDeclAttributes(TUScope, NewFD, *D); 8676 8677 // In auto-retain/release, infer strong retension for fields of 8678 // retainable type. 8679 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8680 NewFD->setInvalidDecl(); 8681 8682 if (T.isObjCGCWeak()) 8683 Diag(Loc, diag::warn_attribute_weak_on_field); 8684 8685 NewFD->setAccess(AS); 8686 return NewFD; 8687} 8688 8689bool Sema::CheckNontrivialField(FieldDecl *FD) { 8690 assert(FD); 8691 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8692 8693 if (FD->isInvalidDecl()) 8694 return true; 8695 8696 QualType EltTy = Context.getBaseElementType(FD->getType()); 8697 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8698 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8699 if (RDecl->getDefinition()) { 8700 // We check for copy constructors before constructors 8701 // because otherwise we'll never get complaints about 8702 // copy constructors. 8703 8704 CXXSpecialMember member = CXXInvalid; 8705 if (!RDecl->hasTrivialCopyConstructor()) 8706 member = CXXCopyConstructor; 8707 else if (!RDecl->hasTrivialDefaultConstructor()) 8708 member = CXXDefaultConstructor; 8709 else if (!RDecl->hasTrivialCopyAssignment()) 8710 member = CXXCopyAssignment; 8711 else if (!RDecl->hasTrivialDestructor()) 8712 member = CXXDestructor; 8713 8714 if (member != CXXInvalid) { 8715 if (!getLangOptions().CPlusPlus0x && 8716 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8717 // Objective-C++ ARC: it is an error to have a non-trivial field of 8718 // a union. However, system headers in Objective-C programs 8719 // occasionally have Objective-C lifetime objects within unions, 8720 // and rather than cause the program to fail, we make those 8721 // members unavailable. 8722 SourceLocation Loc = FD->getLocation(); 8723 if (getSourceManager().isInSystemHeader(Loc)) { 8724 if (!FD->hasAttr<UnavailableAttr>()) 8725 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8726 "this system field has retaining ownership")); 8727 return false; 8728 } 8729 } 8730 8731 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8732 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8733 diag::err_illegal_union_or_anon_struct_member) 8734 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8735 DiagnoseNontrivial(RT, member); 8736 return !getLangOptions().CPlusPlus0x; 8737 } 8738 } 8739 } 8740 8741 return false; 8742} 8743 8744/// DiagnoseNontrivial - Given that a class has a non-trivial 8745/// special member, figure out why. 8746void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8747 QualType QT(T, 0U); 8748 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8749 8750 // Check whether the member was user-declared. 8751 switch (member) { 8752 case CXXInvalid: 8753 break; 8754 8755 case CXXDefaultConstructor: 8756 if (RD->hasUserDeclaredConstructor()) { 8757 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8758 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8759 const FunctionDecl *body = 0; 8760 ci->hasBody(body); 8761 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8762 SourceLocation CtorLoc = ci->getLocation(); 8763 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8764 return; 8765 } 8766 } 8767 8768 llvm_unreachable("found no user-declared constructors"); 8769 } 8770 break; 8771 8772 case CXXCopyConstructor: 8773 if (RD->hasUserDeclaredCopyConstructor()) { 8774 SourceLocation CtorLoc = 8775 RD->getCopyConstructor(0)->getLocation(); 8776 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8777 return; 8778 } 8779 break; 8780 8781 case CXXMoveConstructor: 8782 if (RD->hasUserDeclaredMoveConstructor()) { 8783 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8784 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8785 return; 8786 } 8787 break; 8788 8789 case CXXCopyAssignment: 8790 if (RD->hasUserDeclaredCopyAssignment()) { 8791 // FIXME: this should use the location of the copy 8792 // assignment, not the type. 8793 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8794 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8795 return; 8796 } 8797 break; 8798 8799 case CXXMoveAssignment: 8800 if (RD->hasUserDeclaredMoveAssignment()) { 8801 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8802 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8803 return; 8804 } 8805 break; 8806 8807 case CXXDestructor: 8808 if (RD->hasUserDeclaredDestructor()) { 8809 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8810 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8811 return; 8812 } 8813 break; 8814 } 8815 8816 typedef CXXRecordDecl::base_class_iterator base_iter; 8817 8818 // Virtual bases and members inhibit trivial copying/construction, 8819 // but not trivial destruction. 8820 if (member != CXXDestructor) { 8821 // Check for virtual bases. vbases includes indirect virtual bases, 8822 // so we just iterate through the direct bases. 8823 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8824 if (bi->isVirtual()) { 8825 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8826 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8827 return; 8828 } 8829 8830 // Check for virtual methods. 8831 typedef CXXRecordDecl::method_iterator meth_iter; 8832 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8833 ++mi) { 8834 if (mi->isVirtual()) { 8835 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8836 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8837 return; 8838 } 8839 } 8840 } 8841 8842 bool (CXXRecordDecl::*hasTrivial)() const; 8843 switch (member) { 8844 case CXXDefaultConstructor: 8845 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8846 case CXXCopyConstructor: 8847 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8848 case CXXCopyAssignment: 8849 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8850 case CXXDestructor: 8851 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8852 default: 8853 llvm_unreachable("unexpected special member"); 8854 } 8855 8856 // Check for nontrivial bases (and recurse). 8857 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8858 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8859 assert(BaseRT && "Don't know how to handle dependent bases"); 8860 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8861 if (!(BaseRecTy->*hasTrivial)()) { 8862 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8863 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8864 DiagnoseNontrivial(BaseRT, member); 8865 return; 8866 } 8867 } 8868 8869 // Check for nontrivial members (and recurse). 8870 typedef RecordDecl::field_iterator field_iter; 8871 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8872 ++fi) { 8873 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8874 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8875 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8876 8877 if (!(EltRD->*hasTrivial)()) { 8878 SourceLocation FLoc = (*fi)->getLocation(); 8879 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8880 DiagnoseNontrivial(EltRT, member); 8881 return; 8882 } 8883 } 8884 8885 if (EltTy->isObjCLifetimeType()) { 8886 switch (EltTy.getObjCLifetime()) { 8887 case Qualifiers::OCL_None: 8888 case Qualifiers::OCL_ExplicitNone: 8889 break; 8890 8891 case Qualifiers::OCL_Autoreleasing: 8892 case Qualifiers::OCL_Weak: 8893 case Qualifiers::OCL_Strong: 8894 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8895 << QT << EltTy.getObjCLifetime(); 8896 return; 8897 } 8898 } 8899 } 8900 8901 llvm_unreachable("found no explanation for non-trivial member"); 8902} 8903 8904/// TranslateIvarVisibility - Translate visibility from a token ID to an 8905/// AST enum value. 8906static ObjCIvarDecl::AccessControl 8907TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8908 switch (ivarVisibility) { 8909 default: llvm_unreachable("Unknown visitibility kind"); 8910 case tok::objc_private: return ObjCIvarDecl::Private; 8911 case tok::objc_public: return ObjCIvarDecl::Public; 8912 case tok::objc_protected: return ObjCIvarDecl::Protected; 8913 case tok::objc_package: return ObjCIvarDecl::Package; 8914 } 8915} 8916 8917/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8918/// in order to create an IvarDecl object for it. 8919Decl *Sema::ActOnIvar(Scope *S, 8920 SourceLocation DeclStart, 8921 Declarator &D, Expr *BitfieldWidth, 8922 tok::ObjCKeywordKind Visibility) { 8923 8924 IdentifierInfo *II = D.getIdentifier(); 8925 Expr *BitWidth = (Expr*)BitfieldWidth; 8926 SourceLocation Loc = DeclStart; 8927 if (II) Loc = D.getIdentifierLoc(); 8928 8929 // FIXME: Unnamed fields can be handled in various different ways, for 8930 // example, unnamed unions inject all members into the struct namespace! 8931 8932 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8933 QualType T = TInfo->getType(); 8934 8935 if (BitWidth) { 8936 // 6.7.2.1p3, 6.7.2.1p4 8937 if (VerifyBitField(Loc, II, T, BitWidth)) { 8938 D.setInvalidType(); 8939 BitWidth = 0; 8940 } 8941 } else { 8942 // Not a bitfield. 8943 8944 // validate II. 8945 8946 } 8947 if (T->isReferenceType()) { 8948 Diag(Loc, diag::err_ivar_reference_type); 8949 D.setInvalidType(); 8950 } 8951 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8952 // than a variably modified type. 8953 else if (T->isVariablyModifiedType()) { 8954 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8955 D.setInvalidType(); 8956 } 8957 8958 // Get the visibility (access control) for this ivar. 8959 ObjCIvarDecl::AccessControl ac = 8960 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8961 : ObjCIvarDecl::None; 8962 // Must set ivar's DeclContext to its enclosing interface. 8963 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8964 ObjCContainerDecl *EnclosingContext; 8965 if (ObjCImplementationDecl *IMPDecl = 8966 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8967 if (!LangOpts.ObjCNonFragileABI2) { 8968 // Case of ivar declared in an implementation. Context is that of its class. 8969 EnclosingContext = IMPDecl->getClassInterface(); 8970 assert(EnclosingContext && "Implementation has no class interface!"); 8971 } 8972 else 8973 EnclosingContext = EnclosingDecl; 8974 } else { 8975 if (ObjCCategoryDecl *CDecl = 8976 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8977 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8978 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8979 return 0; 8980 } 8981 } 8982 EnclosingContext = EnclosingDecl; 8983 } 8984 8985 // Construct the decl. 8986 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8987 DeclStart, Loc, II, T, 8988 TInfo, ac, (Expr *)BitfieldWidth); 8989 8990 if (II) { 8991 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8992 ForRedeclaration); 8993 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8994 && !isa<TagDecl>(PrevDecl)) { 8995 Diag(Loc, diag::err_duplicate_member) << II; 8996 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8997 NewID->setInvalidDecl(); 8998 } 8999 } 9000 9001 // Process attributes attached to the ivar. 9002 ProcessDeclAttributes(S, NewID, D); 9003 9004 if (D.isInvalidType()) 9005 NewID->setInvalidDecl(); 9006 9007 // In ARC, infer 'retaining' for ivars of retainable type. 9008 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9009 NewID->setInvalidDecl(); 9010 9011 if (D.getDeclSpec().isModulePrivateSpecified()) 9012 NewID->setModulePrivate(); 9013 9014 if (II) { 9015 // FIXME: When interfaces are DeclContexts, we'll need to add 9016 // these to the interface. 9017 S->AddDecl(NewID); 9018 IdResolver.AddDecl(NewID); 9019 } 9020 9021 return NewID; 9022} 9023 9024/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9025/// class and class extensions. For every class @interface and class 9026/// extension @interface, if the last ivar is a bitfield of any type, 9027/// then add an implicit `char :0` ivar to the end of that interface. 9028void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9029 SmallVectorImpl<Decl *> &AllIvarDecls) { 9030 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9031 return; 9032 9033 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9034 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9035 9036 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9037 return; 9038 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9039 if (!ID) { 9040 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9041 if (!CD->IsClassExtension()) 9042 return; 9043 } 9044 // No need to add this to end of @implementation. 9045 else 9046 return; 9047 } 9048 // All conditions are met. Add a new bitfield to the tail end of ivars. 9049 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9050 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9051 9052 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9053 DeclLoc, DeclLoc, 0, 9054 Context.CharTy, 9055 Context.getTrivialTypeSourceInfo(Context.CharTy, 9056 DeclLoc), 9057 ObjCIvarDecl::Private, BW, 9058 true); 9059 AllIvarDecls.push_back(Ivar); 9060} 9061 9062void Sema::ActOnFields(Scope* S, 9063 SourceLocation RecLoc, Decl *EnclosingDecl, 9064 llvm::ArrayRef<Decl *> Fields, 9065 SourceLocation LBrac, SourceLocation RBrac, 9066 AttributeList *Attr) { 9067 assert(EnclosingDecl && "missing record or interface decl"); 9068 9069 // If the decl this is being inserted into is invalid, then it may be a 9070 // redeclaration or some other bogus case. Don't try to add fields to it. 9071 if (EnclosingDecl->isInvalidDecl()) 9072 return; 9073 9074 // Verify that all the fields are okay. 9075 unsigned NumNamedMembers = 0; 9076 SmallVector<FieldDecl*, 32> RecFields; 9077 9078 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9079 bool ARCErrReported = false; 9080 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9081 i != end; ++i) { 9082 FieldDecl *FD = cast<FieldDecl>(*i); 9083 9084 // Get the type for the field. 9085 const Type *FDTy = FD->getType().getTypePtr(); 9086 9087 if (!FD->isAnonymousStructOrUnion()) { 9088 // Remember all fields written by the user. 9089 RecFields.push_back(FD); 9090 } 9091 9092 // If the field is already invalid for some reason, don't emit more 9093 // diagnostics about it. 9094 if (FD->isInvalidDecl()) { 9095 EnclosingDecl->setInvalidDecl(); 9096 continue; 9097 } 9098 9099 // C99 6.7.2.1p2: 9100 // A structure or union shall not contain a member with 9101 // incomplete or function type (hence, a structure shall not 9102 // contain an instance of itself, but may contain a pointer to 9103 // an instance of itself), except that the last member of a 9104 // structure with more than one named member may have incomplete 9105 // array type; such a structure (and any union containing, 9106 // possibly recursively, a member that is such a structure) 9107 // shall not be a member of a structure or an element of an 9108 // array. 9109 if (FDTy->isFunctionType()) { 9110 // Field declared as a function. 9111 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9112 << FD->getDeclName(); 9113 FD->setInvalidDecl(); 9114 EnclosingDecl->setInvalidDecl(); 9115 continue; 9116 } else if (FDTy->isIncompleteArrayType() && Record && 9117 ((i + 1 == Fields.end() && !Record->isUnion()) || 9118 ((getLangOptions().MicrosoftExt || 9119 getLangOptions().CPlusPlus) && 9120 (i + 1 == Fields.end() || Record->isUnion())))) { 9121 // Flexible array member. 9122 // Microsoft and g++ is more permissive regarding flexible array. 9123 // It will accept flexible array in union and also 9124 // as the sole element of a struct/class. 9125 if (getLangOptions().MicrosoftExt) { 9126 if (Record->isUnion()) 9127 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9128 << FD->getDeclName(); 9129 else if (Fields.size() == 1) 9130 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9131 << FD->getDeclName() << Record->getTagKind(); 9132 } else if (getLangOptions().CPlusPlus) { 9133 if (Record->isUnion()) 9134 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9135 << FD->getDeclName(); 9136 else if (Fields.size() == 1) 9137 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9138 << FD->getDeclName() << Record->getTagKind(); 9139 } else if (NumNamedMembers < 1) { 9140 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9141 << FD->getDeclName(); 9142 FD->setInvalidDecl(); 9143 EnclosingDecl->setInvalidDecl(); 9144 continue; 9145 } 9146 if (!FD->getType()->isDependentType() && 9147 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9148 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9149 << FD->getDeclName() << FD->getType(); 9150 FD->setInvalidDecl(); 9151 EnclosingDecl->setInvalidDecl(); 9152 continue; 9153 } 9154 // Okay, we have a legal flexible array member at the end of the struct. 9155 if (Record) 9156 Record->setHasFlexibleArrayMember(true); 9157 } else if (!FDTy->isDependentType() && 9158 RequireCompleteType(FD->getLocation(), FD->getType(), 9159 diag::err_field_incomplete)) { 9160 // Incomplete type 9161 FD->setInvalidDecl(); 9162 EnclosingDecl->setInvalidDecl(); 9163 continue; 9164 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9165 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9166 // If this is a member of a union, then entire union becomes "flexible". 9167 if (Record && Record->isUnion()) { 9168 Record->setHasFlexibleArrayMember(true); 9169 } else { 9170 // If this is a struct/class and this is not the last element, reject 9171 // it. Note that GCC supports variable sized arrays in the middle of 9172 // structures. 9173 if (i + 1 != Fields.end()) 9174 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9175 << FD->getDeclName() << FD->getType(); 9176 else { 9177 // We support flexible arrays at the end of structs in 9178 // other structs as an extension. 9179 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9180 << FD->getDeclName(); 9181 if (Record) 9182 Record->setHasFlexibleArrayMember(true); 9183 } 9184 } 9185 } 9186 if (Record && FDTTy->getDecl()->hasObjectMember()) 9187 Record->setHasObjectMember(true); 9188 } else if (FDTy->isObjCObjectType()) { 9189 /// A field cannot be an Objective-c object 9190 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9191 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9192 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9193 FD->setType(T); 9194 } 9195 else if (!getLangOptions().CPlusPlus) { 9196 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9197 // It's an error in ARC if a field has lifetime. 9198 // We don't want to report this in a system header, though, 9199 // so we just make the field unavailable. 9200 // FIXME: that's really not sufficient; we need to make the type 9201 // itself invalid to, say, initialize or copy. 9202 QualType T = FD->getType(); 9203 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9204 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9205 SourceLocation loc = FD->getLocation(); 9206 if (getSourceManager().isInSystemHeader(loc)) { 9207 if (!FD->hasAttr<UnavailableAttr>()) { 9208 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9209 "this system field has retaining ownership")); 9210 } 9211 } else { 9212 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9213 } 9214 ARCErrReported = true; 9215 } 9216 } 9217 else if (getLangOptions().ObjC1 && 9218 getLangOptions().getGC() != LangOptions::NonGC && 9219 Record && !Record->hasObjectMember()) { 9220 if (FD->getType()->isObjCObjectPointerType() || 9221 FD->getType().isObjCGCStrong()) 9222 Record->setHasObjectMember(true); 9223 else if (Context.getAsArrayType(FD->getType())) { 9224 QualType BaseType = Context.getBaseElementType(FD->getType()); 9225 if (BaseType->isRecordType() && 9226 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9227 Record->setHasObjectMember(true); 9228 else if (BaseType->isObjCObjectPointerType() || 9229 BaseType.isObjCGCStrong()) 9230 Record->setHasObjectMember(true); 9231 } 9232 } 9233 } 9234 // Keep track of the number of named members. 9235 if (FD->getIdentifier()) 9236 ++NumNamedMembers; 9237 } 9238 9239 // Okay, we successfully defined 'Record'. 9240 if (Record) { 9241 bool Completed = false; 9242 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9243 if (!CXXRecord->isInvalidDecl()) { 9244 // Set access bits correctly on the directly-declared conversions. 9245 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9246 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9247 I != E; ++I) 9248 Convs->setAccess(I, (*I)->getAccess()); 9249 9250 if (!CXXRecord->isDependentType()) { 9251 // Objective-C Automatic Reference Counting: 9252 // If a class has a non-static data member of Objective-C pointer 9253 // type (or array thereof), it is a non-POD type and its 9254 // default constructor (if any), copy constructor, copy assignment 9255 // operator, and destructor are non-trivial. 9256 // 9257 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9258 // However, here we check whether this particular class is only 9259 // non-POD because of the presence of an Objective-C pointer member. 9260 // If so, objects of this type cannot be shared between code compiled 9261 // with instant objects and code compiled with manual retain/release. 9262 if (getLangOptions().ObjCAutoRefCount && 9263 CXXRecord->hasObjectMember() && 9264 CXXRecord->getLinkage() == ExternalLinkage) { 9265 if (CXXRecord->isPOD()) { 9266 Diag(CXXRecord->getLocation(), 9267 diag::warn_arc_non_pod_class_with_object_member) 9268 << CXXRecord; 9269 } else { 9270 // FIXME: Fix-Its would be nice here, but finding a good location 9271 // for them is going to be tricky. 9272 if (CXXRecord->hasTrivialCopyConstructor()) 9273 Diag(CXXRecord->getLocation(), 9274 diag::warn_arc_trivial_member_function_with_object_member) 9275 << CXXRecord << 0; 9276 if (CXXRecord->hasTrivialCopyAssignment()) 9277 Diag(CXXRecord->getLocation(), 9278 diag::warn_arc_trivial_member_function_with_object_member) 9279 << CXXRecord << 1; 9280 if (CXXRecord->hasTrivialDestructor()) 9281 Diag(CXXRecord->getLocation(), 9282 diag::warn_arc_trivial_member_function_with_object_member) 9283 << CXXRecord << 2; 9284 } 9285 } 9286 9287 // Adjust user-defined destructor exception spec. 9288 if (getLangOptions().CPlusPlus0x && 9289 CXXRecord->hasUserDeclaredDestructor()) 9290 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9291 9292 // Add any implicitly-declared members to this class. 9293 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9294 9295 // If we have virtual base classes, we may end up finding multiple 9296 // final overriders for a given virtual function. Check for this 9297 // problem now. 9298 if (CXXRecord->getNumVBases()) { 9299 CXXFinalOverriderMap FinalOverriders; 9300 CXXRecord->getFinalOverriders(FinalOverriders); 9301 9302 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9303 MEnd = FinalOverriders.end(); 9304 M != MEnd; ++M) { 9305 for (OverridingMethods::iterator SO = M->second.begin(), 9306 SOEnd = M->second.end(); 9307 SO != SOEnd; ++SO) { 9308 assert(SO->second.size() > 0 && 9309 "Virtual function without overridding functions?"); 9310 if (SO->second.size() == 1) 9311 continue; 9312 9313 // C++ [class.virtual]p2: 9314 // In a derived class, if a virtual member function of a base 9315 // class subobject has more than one final overrider the 9316 // program is ill-formed. 9317 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9318 << (NamedDecl *)M->first << Record; 9319 Diag(M->first->getLocation(), 9320 diag::note_overridden_virtual_function); 9321 for (OverridingMethods::overriding_iterator 9322 OM = SO->second.begin(), 9323 OMEnd = SO->second.end(); 9324 OM != OMEnd; ++OM) 9325 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9326 << (NamedDecl *)M->first << OM->Method->getParent(); 9327 9328 Record->setInvalidDecl(); 9329 } 9330 } 9331 CXXRecord->completeDefinition(&FinalOverriders); 9332 Completed = true; 9333 } 9334 } 9335 } 9336 } 9337 9338 if (!Completed) 9339 Record->completeDefinition(); 9340 9341 // Now that the record is complete, do any delayed exception spec checks 9342 // we were missing. 9343 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9344 const CXXDestructorDecl *Dtor = 9345 DelayedDestructorExceptionSpecChecks.back().first; 9346 if (Dtor->getParent() != Record) 9347 break; 9348 9349 assert(!Dtor->getParent()->isDependentType() && 9350 "Should not ever add destructors of templates into the list."); 9351 CheckOverridingFunctionExceptionSpec(Dtor, 9352 DelayedDestructorExceptionSpecChecks.back().second); 9353 DelayedDestructorExceptionSpecChecks.pop_back(); 9354 } 9355 9356 } else { 9357 ObjCIvarDecl **ClsFields = 9358 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9359 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9360 ID->setLocEnd(RBrac); 9361 // Add ivar's to class's DeclContext. 9362 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9363 ClsFields[i]->setLexicalDeclContext(ID); 9364 ID->addDecl(ClsFields[i]); 9365 } 9366 // Must enforce the rule that ivars in the base classes may not be 9367 // duplicates. 9368 if (ID->getSuperClass()) 9369 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9370 } else if (ObjCImplementationDecl *IMPDecl = 9371 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9372 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9373 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9374 // Ivar declared in @implementation never belongs to the implementation. 9375 // Only it is in implementation's lexical context. 9376 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9377 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9378 } else if (ObjCCategoryDecl *CDecl = 9379 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9380 // case of ivars in class extension; all other cases have been 9381 // reported as errors elsewhere. 9382 // FIXME. Class extension does not have a LocEnd field. 9383 // CDecl->setLocEnd(RBrac); 9384 // Add ivar's to class extension's DeclContext. 9385 // Diagnose redeclaration of private ivars. 9386 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9387 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9388 if (IDecl) { 9389 if (const ObjCIvarDecl *ClsIvar = 9390 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9391 Diag(ClsFields[i]->getLocation(), 9392 diag::err_duplicate_ivar_declaration); 9393 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9394 continue; 9395 } 9396 for (const ObjCCategoryDecl *ClsExtDecl = 9397 IDecl->getFirstClassExtension(); 9398 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9399 if (const ObjCIvarDecl *ClsExtIvar = 9400 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9401 Diag(ClsFields[i]->getLocation(), 9402 diag::err_duplicate_ivar_declaration); 9403 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9404 continue; 9405 } 9406 } 9407 } 9408 ClsFields[i]->setLexicalDeclContext(CDecl); 9409 CDecl->addDecl(ClsFields[i]); 9410 } 9411 } 9412 } 9413 9414 if (Attr) 9415 ProcessDeclAttributeList(S, Record, Attr); 9416 9417 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9418 // set the visibility of this record. 9419 if (Record && !Record->getDeclContext()->isRecord()) 9420 AddPushedVisibilityAttribute(Record); 9421} 9422 9423/// \brief Determine whether the given integral value is representable within 9424/// the given type T. 9425static bool isRepresentableIntegerValue(ASTContext &Context, 9426 llvm::APSInt &Value, 9427 QualType T) { 9428 assert(T->isIntegralType(Context) && "Integral type required!"); 9429 unsigned BitWidth = Context.getIntWidth(T); 9430 9431 if (Value.isUnsigned() || Value.isNonNegative()) { 9432 if (T->isSignedIntegerOrEnumerationType()) 9433 --BitWidth; 9434 return Value.getActiveBits() <= BitWidth; 9435 } 9436 return Value.getMinSignedBits() <= BitWidth; 9437} 9438 9439// \brief Given an integral type, return the next larger integral type 9440// (or a NULL type of no such type exists). 9441static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9442 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9443 // enum checking below. 9444 assert(T->isIntegralType(Context) && "Integral type required!"); 9445 const unsigned NumTypes = 4; 9446 QualType SignedIntegralTypes[NumTypes] = { 9447 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9448 }; 9449 QualType UnsignedIntegralTypes[NumTypes] = { 9450 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9451 Context.UnsignedLongLongTy 9452 }; 9453 9454 unsigned BitWidth = Context.getTypeSize(T); 9455 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9456 : UnsignedIntegralTypes; 9457 for (unsigned I = 0; I != NumTypes; ++I) 9458 if (Context.getTypeSize(Types[I]) > BitWidth) 9459 return Types[I]; 9460 9461 return QualType(); 9462} 9463 9464EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9465 EnumConstantDecl *LastEnumConst, 9466 SourceLocation IdLoc, 9467 IdentifierInfo *Id, 9468 Expr *Val) { 9469 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9470 llvm::APSInt EnumVal(IntWidth); 9471 QualType EltTy; 9472 9473 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9474 Val = 0; 9475 9476 if (Val) 9477 Val = DefaultLvalueConversion(Val).take(); 9478 9479 if (Val) { 9480 if (Enum->isDependentType() || Val->isTypeDependent()) 9481 EltTy = Context.DependentTy; 9482 else { 9483 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9484 SourceLocation ExpLoc; 9485 if (!Val->isValueDependent() && 9486 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9487 Val = 0; 9488 } else { 9489 if (!getLangOptions().CPlusPlus) { 9490 // C99 6.7.2.2p2: 9491 // The expression that defines the value of an enumeration constant 9492 // shall be an integer constant expression that has a value 9493 // representable as an int. 9494 9495 // Complain if the value is not representable in an int. 9496 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9497 Diag(IdLoc, diag::ext_enum_value_not_int) 9498 << EnumVal.toString(10) << Val->getSourceRange() 9499 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9500 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9501 // Force the type of the expression to 'int'. 9502 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9503 } 9504 } 9505 9506 if (Enum->isFixed()) { 9507 EltTy = Enum->getIntegerType(); 9508 9509 // C++0x [dcl.enum]p5: 9510 // ... if the initializing value of an enumerator cannot be 9511 // represented by the underlying type, the program is ill-formed. 9512 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9513 if (getLangOptions().MicrosoftExt) { 9514 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9515 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9516 } else 9517 Diag(IdLoc, diag::err_enumerator_too_large) 9518 << EltTy; 9519 } else 9520 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9521 } 9522 else { 9523 // C++0x [dcl.enum]p5: 9524 // If the underlying type is not fixed, the type of each enumerator 9525 // is the type of its initializing value: 9526 // - If an initializer is specified for an enumerator, the 9527 // initializing value has the same type as the expression. 9528 EltTy = Val->getType(); 9529 } 9530 } 9531 } 9532 } 9533 9534 if (!Val) { 9535 if (Enum->isDependentType()) 9536 EltTy = Context.DependentTy; 9537 else if (!LastEnumConst) { 9538 // C++0x [dcl.enum]p5: 9539 // If the underlying type is not fixed, the type of each enumerator 9540 // is the type of its initializing value: 9541 // - If no initializer is specified for the first enumerator, the 9542 // initializing value has an unspecified integral type. 9543 // 9544 // GCC uses 'int' for its unspecified integral type, as does 9545 // C99 6.7.2.2p3. 9546 if (Enum->isFixed()) { 9547 EltTy = Enum->getIntegerType(); 9548 } 9549 else { 9550 EltTy = Context.IntTy; 9551 } 9552 } else { 9553 // Assign the last value + 1. 9554 EnumVal = LastEnumConst->getInitVal(); 9555 ++EnumVal; 9556 EltTy = LastEnumConst->getType(); 9557 9558 // Check for overflow on increment. 9559 if (EnumVal < LastEnumConst->getInitVal()) { 9560 // C++0x [dcl.enum]p5: 9561 // If the underlying type is not fixed, the type of each enumerator 9562 // is the type of its initializing value: 9563 // 9564 // - Otherwise the type of the initializing value is the same as 9565 // the type of the initializing value of the preceding enumerator 9566 // unless the incremented value is not representable in that type, 9567 // in which case the type is an unspecified integral type 9568 // sufficient to contain the incremented value. If no such type 9569 // exists, the program is ill-formed. 9570 QualType T = getNextLargerIntegralType(Context, EltTy); 9571 if (T.isNull() || Enum->isFixed()) { 9572 // There is no integral type larger enough to represent this 9573 // value. Complain, then allow the value to wrap around. 9574 EnumVal = LastEnumConst->getInitVal(); 9575 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9576 ++EnumVal; 9577 if (Enum->isFixed()) 9578 // When the underlying type is fixed, this is ill-formed. 9579 Diag(IdLoc, diag::err_enumerator_wrapped) 9580 << EnumVal.toString(10) 9581 << EltTy; 9582 else 9583 Diag(IdLoc, diag::warn_enumerator_too_large) 9584 << EnumVal.toString(10); 9585 } else { 9586 EltTy = T; 9587 } 9588 9589 // Retrieve the last enumerator's value, extent that type to the 9590 // type that is supposed to be large enough to represent the incremented 9591 // value, then increment. 9592 EnumVal = LastEnumConst->getInitVal(); 9593 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9594 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9595 ++EnumVal; 9596 9597 // If we're not in C++, diagnose the overflow of enumerator values, 9598 // which in C99 means that the enumerator value is not representable in 9599 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9600 // permits enumerator values that are representable in some larger 9601 // integral type. 9602 if (!getLangOptions().CPlusPlus && !T.isNull()) 9603 Diag(IdLoc, diag::warn_enum_value_overflow); 9604 } else if (!getLangOptions().CPlusPlus && 9605 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9606 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9607 Diag(IdLoc, diag::ext_enum_value_not_int) 9608 << EnumVal.toString(10) << 1; 9609 } 9610 } 9611 } 9612 9613 if (!EltTy->isDependentType()) { 9614 // Make the enumerator value match the signedness and size of the 9615 // enumerator's type. 9616 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9617 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9618 } 9619 9620 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9621 Val, EnumVal); 9622} 9623 9624 9625Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9626 SourceLocation IdLoc, IdentifierInfo *Id, 9627 AttributeList *Attr, 9628 SourceLocation EqualLoc, Expr *val) { 9629 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9630 EnumConstantDecl *LastEnumConst = 9631 cast_or_null<EnumConstantDecl>(lastEnumConst); 9632 Expr *Val = static_cast<Expr*>(val); 9633 9634 // The scope passed in may not be a decl scope. Zip up the scope tree until 9635 // we find one that is. 9636 S = getNonFieldDeclScope(S); 9637 9638 // Verify that there isn't already something declared with this name in this 9639 // scope. 9640 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9641 ForRedeclaration); 9642 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9643 // Maybe we will complain about the shadowed template parameter. 9644 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9645 // Just pretend that we didn't see the previous declaration. 9646 PrevDecl = 0; 9647 } 9648 9649 if (PrevDecl) { 9650 // When in C++, we may get a TagDecl with the same name; in this case the 9651 // enum constant will 'hide' the tag. 9652 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9653 "Received TagDecl when not in C++!"); 9654 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9655 if (isa<EnumConstantDecl>(PrevDecl)) 9656 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9657 else 9658 Diag(IdLoc, diag::err_redefinition) << Id; 9659 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9660 return 0; 9661 } 9662 } 9663 9664 // C++ [class.mem]p13: 9665 // If T is the name of a class, then each of the following shall have a 9666 // name different from T: 9667 // - every enumerator of every member of class T that is an enumerated 9668 // type 9669 if (CXXRecordDecl *Record 9670 = dyn_cast<CXXRecordDecl>( 9671 TheEnumDecl->getDeclContext()->getRedeclContext())) 9672 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9673 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9674 9675 EnumConstantDecl *New = 9676 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9677 9678 if (New) { 9679 // Process attributes. 9680 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9681 9682 // Register this decl in the current scope stack. 9683 New->setAccess(TheEnumDecl->getAccess()); 9684 PushOnScopeChains(New, S); 9685 } 9686 9687 return New; 9688} 9689 9690void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9691 SourceLocation RBraceLoc, Decl *EnumDeclX, 9692 Decl **Elements, unsigned NumElements, 9693 Scope *S, AttributeList *Attr) { 9694 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9695 QualType EnumType = Context.getTypeDeclType(Enum); 9696 9697 if (Attr) 9698 ProcessDeclAttributeList(S, Enum, Attr); 9699 9700 if (Enum->isDependentType()) { 9701 for (unsigned i = 0; i != NumElements; ++i) { 9702 EnumConstantDecl *ECD = 9703 cast_or_null<EnumConstantDecl>(Elements[i]); 9704 if (!ECD) continue; 9705 9706 ECD->setType(EnumType); 9707 } 9708 9709 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9710 return; 9711 } 9712 9713 // TODO: If the result value doesn't fit in an int, it must be a long or long 9714 // long value. ISO C does not support this, but GCC does as an extension, 9715 // emit a warning. 9716 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9717 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9718 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9719 9720 // Verify that all the values are okay, compute the size of the values, and 9721 // reverse the list. 9722 unsigned NumNegativeBits = 0; 9723 unsigned NumPositiveBits = 0; 9724 9725 // Keep track of whether all elements have type int. 9726 bool AllElementsInt = true; 9727 9728 for (unsigned i = 0; i != NumElements; ++i) { 9729 EnumConstantDecl *ECD = 9730 cast_or_null<EnumConstantDecl>(Elements[i]); 9731 if (!ECD) continue; // Already issued a diagnostic. 9732 9733 const llvm::APSInt &InitVal = ECD->getInitVal(); 9734 9735 // Keep track of the size of positive and negative values. 9736 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9737 NumPositiveBits = std::max(NumPositiveBits, 9738 (unsigned)InitVal.getActiveBits()); 9739 else 9740 NumNegativeBits = std::max(NumNegativeBits, 9741 (unsigned)InitVal.getMinSignedBits()); 9742 9743 // Keep track of whether every enum element has type int (very commmon). 9744 if (AllElementsInt) 9745 AllElementsInt = ECD->getType() == Context.IntTy; 9746 } 9747 9748 // Figure out the type that should be used for this enum. 9749 QualType BestType; 9750 unsigned BestWidth; 9751 9752 // C++0x N3000 [conv.prom]p3: 9753 // An rvalue of an unscoped enumeration type whose underlying 9754 // type is not fixed can be converted to an rvalue of the first 9755 // of the following types that can represent all the values of 9756 // the enumeration: int, unsigned int, long int, unsigned long 9757 // int, long long int, or unsigned long long int. 9758 // C99 6.4.4.3p2: 9759 // An identifier declared as an enumeration constant has type int. 9760 // The C99 rule is modified by a gcc extension 9761 QualType BestPromotionType; 9762 9763 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9764 // -fshort-enums is the equivalent to specifying the packed attribute on all 9765 // enum definitions. 9766 if (LangOpts.ShortEnums) 9767 Packed = true; 9768 9769 if (Enum->isFixed()) { 9770 BestType = Enum->getIntegerType(); 9771 if (BestType->isPromotableIntegerType()) 9772 BestPromotionType = Context.getPromotedIntegerType(BestType); 9773 else 9774 BestPromotionType = BestType; 9775 // We don't need to set BestWidth, because BestType is going to be the type 9776 // of the enumerators, but we do anyway because otherwise some compilers 9777 // warn that it might be used uninitialized. 9778 BestWidth = CharWidth; 9779 } 9780 else if (NumNegativeBits) { 9781 // If there is a negative value, figure out the smallest integer type (of 9782 // int/long/longlong) that fits. 9783 // If it's packed, check also if it fits a char or a short. 9784 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9785 BestType = Context.SignedCharTy; 9786 BestWidth = CharWidth; 9787 } else if (Packed && NumNegativeBits <= ShortWidth && 9788 NumPositiveBits < ShortWidth) { 9789 BestType = Context.ShortTy; 9790 BestWidth = ShortWidth; 9791 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9792 BestType = Context.IntTy; 9793 BestWidth = IntWidth; 9794 } else { 9795 BestWidth = Context.getTargetInfo().getLongWidth(); 9796 9797 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9798 BestType = Context.LongTy; 9799 } else { 9800 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9801 9802 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9803 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9804 BestType = Context.LongLongTy; 9805 } 9806 } 9807 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9808 } else { 9809 // If there is no negative value, figure out the smallest type that fits 9810 // all of the enumerator values. 9811 // If it's packed, check also if it fits a char or a short. 9812 if (Packed && NumPositiveBits <= CharWidth) { 9813 BestType = Context.UnsignedCharTy; 9814 BestPromotionType = Context.IntTy; 9815 BestWidth = CharWidth; 9816 } else if (Packed && NumPositiveBits <= ShortWidth) { 9817 BestType = Context.UnsignedShortTy; 9818 BestPromotionType = Context.IntTy; 9819 BestWidth = ShortWidth; 9820 } else if (NumPositiveBits <= IntWidth) { 9821 BestType = Context.UnsignedIntTy; 9822 BestWidth = IntWidth; 9823 BestPromotionType 9824 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9825 ? Context.UnsignedIntTy : Context.IntTy; 9826 } else if (NumPositiveBits <= 9827 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9828 BestType = Context.UnsignedLongTy; 9829 BestPromotionType 9830 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9831 ? Context.UnsignedLongTy : Context.LongTy; 9832 } else { 9833 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9834 assert(NumPositiveBits <= BestWidth && 9835 "How could an initializer get larger than ULL?"); 9836 BestType = Context.UnsignedLongLongTy; 9837 BestPromotionType 9838 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9839 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9840 } 9841 } 9842 9843 // Loop over all of the enumerator constants, changing their types to match 9844 // the type of the enum if needed. 9845 for (unsigned i = 0; i != NumElements; ++i) { 9846 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9847 if (!ECD) continue; // Already issued a diagnostic. 9848 9849 // Standard C says the enumerators have int type, but we allow, as an 9850 // extension, the enumerators to be larger than int size. If each 9851 // enumerator value fits in an int, type it as an int, otherwise type it the 9852 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9853 // that X has type 'int', not 'unsigned'. 9854 9855 // Determine whether the value fits into an int. 9856 llvm::APSInt InitVal = ECD->getInitVal(); 9857 9858 // If it fits into an integer type, force it. Otherwise force it to match 9859 // the enum decl type. 9860 QualType NewTy; 9861 unsigned NewWidth; 9862 bool NewSign; 9863 if (!getLangOptions().CPlusPlus && 9864 !Enum->isFixed() && 9865 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9866 NewTy = Context.IntTy; 9867 NewWidth = IntWidth; 9868 NewSign = true; 9869 } else if (ECD->getType() == BestType) { 9870 // Already the right type! 9871 if (getLangOptions().CPlusPlus) 9872 // C++ [dcl.enum]p4: Following the closing brace of an 9873 // enum-specifier, each enumerator has the type of its 9874 // enumeration. 9875 ECD->setType(EnumType); 9876 continue; 9877 } else { 9878 NewTy = BestType; 9879 NewWidth = BestWidth; 9880 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9881 } 9882 9883 // Adjust the APSInt value. 9884 InitVal = InitVal.extOrTrunc(NewWidth); 9885 InitVal.setIsSigned(NewSign); 9886 ECD->setInitVal(InitVal); 9887 9888 // Adjust the Expr initializer and type. 9889 if (ECD->getInitExpr() && 9890 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9891 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9892 CK_IntegralCast, 9893 ECD->getInitExpr(), 9894 /*base paths*/ 0, 9895 VK_RValue)); 9896 if (getLangOptions().CPlusPlus) 9897 // C++ [dcl.enum]p4: Following the closing brace of an 9898 // enum-specifier, each enumerator has the type of its 9899 // enumeration. 9900 ECD->setType(EnumType); 9901 else 9902 ECD->setType(NewTy); 9903 } 9904 9905 Enum->completeDefinition(BestType, BestPromotionType, 9906 NumPositiveBits, NumNegativeBits); 9907} 9908 9909Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9910 SourceLocation StartLoc, 9911 SourceLocation EndLoc) { 9912 StringLiteral *AsmString = cast<StringLiteral>(expr); 9913 9914 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9915 AsmString, StartLoc, 9916 EndLoc); 9917 CurContext->addDecl(New); 9918 return New; 9919} 9920 9921DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, ModuleIdPath Path) { 9922 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9923 Module::AllVisible, 9924 /*IsIncludeDirective=*/false); 9925 if (!Mod) 9926 return true; 9927 9928 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9929 Module *ModCheck = Mod; 9930 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9931 // If we've run out of module parents, just drop the remaining identifiers. 9932 // We need the length to be consistent. 9933 if (!ModCheck) 9934 break; 9935 ModCheck = ModCheck->Parent; 9936 9937 IdentifierLocs.push_back(Path[I].second); 9938 } 9939 9940 ImportDecl *Import = ImportDecl::Create(Context, 9941 Context.getTranslationUnitDecl(), 9942 ImportLoc, Mod, 9943 IdentifierLocs); 9944 Context.getTranslationUnitDecl()->addDecl(Import); 9945 return Import; 9946} 9947 9948void 9949Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9950 SourceLocation ModulePrivateKeyword) { 9951 assert(!Old->isModulePrivate() && "Old is module-private!"); 9952 9953 Diag(New->getLocation(), diag::err_module_private_follows_public) 9954 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9955 Diag(Old->getLocation(), diag::note_previous_declaration) 9956 << Old->getDeclName(); 9957 9958 // Drop the __module_private__ from the new declaration, since it's invalid. 9959 New->setModulePrivate(false); 9960} 9961 9962void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9963 SourceLocation PragmaLoc, 9964 SourceLocation NameLoc) { 9965 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9966 9967 if (PrevDecl) { 9968 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9969 } else { 9970 (void)WeakUndeclaredIdentifiers.insert( 9971 std::pair<IdentifierInfo*,WeakInfo> 9972 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9973 } 9974} 9975 9976void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9977 IdentifierInfo* AliasName, 9978 SourceLocation PragmaLoc, 9979 SourceLocation NameLoc, 9980 SourceLocation AliasNameLoc) { 9981 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9982 LookupOrdinaryName); 9983 WeakInfo W = WeakInfo(Name, NameLoc); 9984 9985 if (PrevDecl) { 9986 if (!PrevDecl->hasAttr<AliasAttr>()) 9987 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9988 DeclApplyPragmaWeak(TUScope, ND, W); 9989 } else { 9990 (void)WeakUndeclaredIdentifiers.insert( 9991 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9992 } 9993} 9994 9995Decl *Sema::getObjCDeclContext() const { 9996 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9997} 9998 9999AvailabilityResult Sema::getCurContextAvailability() const { 10000 const Decl *D = cast<Decl>(getCurLexicalContext()); 10001 // A category implicitly has the availability of the interface. 10002 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10003 D = CatD->getClassInterface(); 10004 10005 return D->getAvailability(); 10006} 10007