SemaDecl.cpp revision 2b79c320b0801e0094df6c70ad8062da6c58bd1c
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo, 75 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 421 } else { 422 assert(SS && SS->isInvalid() && 423 "Invalid scope specifier has already been diagnosed"); 424 } 425 426 return true; 427} 428 429/// \brief Determine whether the given result set contains either a type name 430/// or 431static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 433 NextToken.is(tok::less); 434 435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 437 return true; 438 439 if (CheckTemplate && isa<TemplateDecl>(*I)) 440 return true; 441 } 442 443 return false; 444} 445 446Sema::NameClassification Sema::ClassifyName(Scope *S, 447 CXXScopeSpec &SS, 448 IdentifierInfo *&Name, 449 SourceLocation NameLoc, 450 const Token &NextToken) { 451 DeclarationNameInfo NameInfo(Name, NameLoc); 452 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 453 454 if (NextToken.is(tok::coloncolon)) { 455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 456 QualType(), false, SS, 0, false); 457 458 } 459 460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 461 LookupParsedName(Result, S, &SS, !CurMethod); 462 463 // Perform lookup for Objective-C instance variables (including automatically 464 // synthesized instance variables), if we're in an Objective-C method. 465 // FIXME: This lookup really, really needs to be folded in to the normal 466 // unqualified lookup mechanism. 467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 468 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 469 if (E.get() || E.isInvalid()) 470 return E; 471 } 472 473 bool SecondTry = false; 474 bool IsFilteredTemplateName = false; 475 476Corrected: 477 switch (Result.getResultKind()) { 478 case LookupResult::NotFound: 479 // If an unqualified-id is followed by a '(', then we have a function 480 // call. 481 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 482 // In C++, this is an ADL-only call. 483 // FIXME: Reference? 484 if (getLangOptions().CPlusPlus) 485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 486 487 // C90 6.3.2.2: 488 // If the expression that precedes the parenthesized argument list in a 489 // function call consists solely of an identifier, and if no 490 // declaration is visible for this identifier, the identifier is 491 // implicitly declared exactly as if, in the innermost block containing 492 // the function call, the declaration 493 // 494 // extern int identifier (); 495 // 496 // appeared. 497 // 498 // We also allow this in C99 as an extension. 499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 500 Result.addDecl(D); 501 Result.resolveKind(); 502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 503 } 504 } 505 506 // In C, we first see whether there is a tag type by the same name, in 507 // which case it's likely that the user just forget to write "enum", 508 // "struct", or "union". 509 if (!getLangOptions().CPlusPlus && !SecondTry) { 510 Result.clear(LookupTagName); 511 LookupParsedName(Result, S, &SS); 512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 513 const char *TagName = 0; 514 const char *FixItTagName = 0; 515 switch (Tag->getTagKind()) { 516 case TTK_Class: 517 TagName = "class"; 518 FixItTagName = "class "; 519 break; 520 521 case TTK_Enum: 522 TagName = "enum"; 523 FixItTagName = "enum "; 524 break; 525 526 case TTK_Struct: 527 TagName = "struct"; 528 FixItTagName = "struct "; 529 break; 530 531 case TTK_Union: 532 TagName = "union"; 533 FixItTagName = "union "; 534 break; 535 } 536 537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 538 << Name << TagName << getLangOptions().CPlusPlus 539 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 540 break; 541 } 542 543 Result.clear(LookupOrdinaryName); 544 } 545 546 // Perform typo correction to determine if there is another name that is 547 // close to this name. 548 if (!SecondTry) { 549 SecondTry = true; 550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 551 Result.getLookupKind(), S, &SS)) { 552 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 553 unsigned QualifiedDiag = diag::err_no_member_suggest; 554 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 555 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 556 557 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 558 NamedDecl *UnderlyingFirstDecl 559 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 560 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 561 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 562 UnqualifiedDiag = diag::err_no_template_suggest; 563 QualifiedDiag = diag::err_no_member_template_suggest; 564 } else if (UnderlyingFirstDecl && 565 (isa<TypeDecl>(UnderlyingFirstDecl) || 566 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 567 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 568 UnqualifiedDiag = diag::err_unknown_typename_suggest; 569 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 570 } 571 572 if (SS.isEmpty()) 573 Diag(NameLoc, UnqualifiedDiag) 574 << Name << CorrectedQuotedStr 575 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 576 else 577 Diag(NameLoc, QualifiedDiag) 578 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 579 << SS.getRange() 580 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 581 582 // Update the name, so that the caller has the new name. 583 Name = Corrected.getCorrectionAsIdentifierInfo(); 584 585 // Also update the LookupResult... 586 // FIXME: This should probably go away at some point 587 Result.clear(); 588 Result.setLookupName(Corrected.getCorrection()); 589 if (FirstDecl) Result.addDecl(FirstDecl); 590 591 // Typo correction corrected to a keyword. 592 if (Corrected.isKeyword()) 593 return Corrected.getCorrectionAsIdentifierInfo(); 594 595 if (FirstDecl) 596 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 597 << CorrectedQuotedStr; 598 599 // If we found an Objective-C instance variable, let 600 // LookupInObjCMethod build the appropriate expression to 601 // reference the ivar. 602 // FIXME: This is a gross hack. 603 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 604 Result.clear(); 605 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 606 return move(E); 607 } 608 609 goto Corrected; 610 } 611 } 612 613 // We failed to correct; just fall through and let the parser deal with it. 614 Result.suppressDiagnostics(); 615 return NameClassification::Unknown(); 616 617 case LookupResult::NotFoundInCurrentInstantiation: 618 // We performed name lookup into the current instantiation, and there were 619 // dependent bases, so we treat this result the same way as any other 620 // dependent nested-name-specifier. 621 622 // C++ [temp.res]p2: 623 // A name used in a template declaration or definition and that is 624 // dependent on a template-parameter is assumed not to name a type 625 // unless the applicable name lookup finds a type name or the name is 626 // qualified by the keyword typename. 627 // 628 // FIXME: If the next token is '<', we might want to ask the parser to 629 // perform some heroics to see if we actually have a 630 // template-argument-list, which would indicate a missing 'template' 631 // keyword here. 632 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 633 634 case LookupResult::Found: 635 case LookupResult::FoundOverloaded: 636 case LookupResult::FoundUnresolvedValue: 637 break; 638 639 case LookupResult::Ambiguous: 640 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 641 hasAnyAcceptableTemplateNames(Result)) { 642 // C++ [temp.local]p3: 643 // A lookup that finds an injected-class-name (10.2) can result in an 644 // ambiguity in certain cases (for example, if it is found in more than 645 // one base class). If all of the injected-class-names that are found 646 // refer to specializations of the same class template, and if the name 647 // is followed by a template-argument-list, the reference refers to the 648 // class template itself and not a specialization thereof, and is not 649 // ambiguous. 650 // 651 // This filtering can make an ambiguous result into an unambiguous one, 652 // so try again after filtering out template names. 653 FilterAcceptableTemplateNames(Result); 654 if (!Result.isAmbiguous()) { 655 IsFilteredTemplateName = true; 656 break; 657 } 658 } 659 660 // Diagnose the ambiguity and return an error. 661 return NameClassification::Error(); 662 } 663 664 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 665 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 666 // C++ [temp.names]p3: 667 // After name lookup (3.4) finds that a name is a template-name or that 668 // an operator-function-id or a literal- operator-id refers to a set of 669 // overloaded functions any member of which is a function template if 670 // this is followed by a <, the < is always taken as the delimiter of a 671 // template-argument-list and never as the less-than operator. 672 if (!IsFilteredTemplateName) 673 FilterAcceptableTemplateNames(Result); 674 675 if (!Result.empty()) { 676 bool IsFunctionTemplate; 677 TemplateName Template; 678 if (Result.end() - Result.begin() > 1) { 679 IsFunctionTemplate = true; 680 Template = Context.getOverloadedTemplateName(Result.begin(), 681 Result.end()); 682 } else { 683 TemplateDecl *TD 684 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 685 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 686 687 if (SS.isSet() && !SS.isInvalid()) 688 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 689 /*TemplateKeyword=*/false, 690 TD); 691 else 692 Template = TemplateName(TD); 693 } 694 695 if (IsFunctionTemplate) { 696 // Function templates always go through overload resolution, at which 697 // point we'll perform the various checks (e.g., accessibility) we need 698 // to based on which function we selected. 699 Result.suppressDiagnostics(); 700 701 return NameClassification::FunctionTemplate(Template); 702 } 703 704 return NameClassification::TypeTemplate(Template); 705 } 706 } 707 708 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 709 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 710 DiagnoseUseOfDecl(Type, NameLoc); 711 QualType T = Context.getTypeDeclType(Type); 712 return ParsedType::make(T); 713 } 714 715 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 716 if (!Class) { 717 // FIXME: It's unfortunate that we don't have a Type node for handling this. 718 if (ObjCCompatibleAliasDecl *Alias 719 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 720 Class = Alias->getClassInterface(); 721 } 722 723 if (Class) { 724 DiagnoseUseOfDecl(Class, NameLoc); 725 726 if (NextToken.is(tok::period)) { 727 // Interface. <something> is parsed as a property reference expression. 728 // Just return "unknown" as a fall-through for now. 729 Result.suppressDiagnostics(); 730 return NameClassification::Unknown(); 731 } 732 733 QualType T = Context.getObjCInterfaceType(Class); 734 return ParsedType::make(T); 735 } 736 737 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 738 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 739 740 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 741 return BuildDeclarationNameExpr(SS, Result, ADL); 742} 743 744// Determines the context to return to after temporarily entering a 745// context. This depends in an unnecessarily complicated way on the 746// exact ordering of callbacks from the parser. 747DeclContext *Sema::getContainingDC(DeclContext *DC) { 748 749 // Functions defined inline within classes aren't parsed until we've 750 // finished parsing the top-level class, so the top-level class is 751 // the context we'll need to return to. 752 if (isa<FunctionDecl>(DC)) { 753 DC = DC->getLexicalParent(); 754 755 // A function not defined within a class will always return to its 756 // lexical context. 757 if (!isa<CXXRecordDecl>(DC)) 758 return DC; 759 760 // A C++ inline method/friend is parsed *after* the topmost class 761 // it was declared in is fully parsed ("complete"); the topmost 762 // class is the context we need to return to. 763 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 764 DC = RD; 765 766 // Return the declaration context of the topmost class the inline method is 767 // declared in. 768 return DC; 769 } 770 771 return DC->getLexicalParent(); 772} 773 774void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 775 assert(getContainingDC(DC) == CurContext && 776 "The next DeclContext should be lexically contained in the current one."); 777 CurContext = DC; 778 S->setEntity(DC); 779} 780 781void Sema::PopDeclContext() { 782 assert(CurContext && "DeclContext imbalance!"); 783 784 CurContext = getContainingDC(CurContext); 785 assert(CurContext && "Popped translation unit!"); 786} 787 788/// EnterDeclaratorContext - Used when we must lookup names in the context 789/// of a declarator's nested name specifier. 790/// 791void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 792 // C++0x [basic.lookup.unqual]p13: 793 // A name used in the definition of a static data member of class 794 // X (after the qualified-id of the static member) is looked up as 795 // if the name was used in a member function of X. 796 // C++0x [basic.lookup.unqual]p14: 797 // If a variable member of a namespace is defined outside of the 798 // scope of its namespace then any name used in the definition of 799 // the variable member (after the declarator-id) is looked up as 800 // if the definition of the variable member occurred in its 801 // namespace. 802 // Both of these imply that we should push a scope whose context 803 // is the semantic context of the declaration. We can't use 804 // PushDeclContext here because that context is not necessarily 805 // lexically contained in the current context. Fortunately, 806 // the containing scope should have the appropriate information. 807 808 assert(!S->getEntity() && "scope already has entity"); 809 810#ifndef NDEBUG 811 Scope *Ancestor = S->getParent(); 812 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 813 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 814#endif 815 816 CurContext = DC; 817 S->setEntity(DC); 818} 819 820void Sema::ExitDeclaratorContext(Scope *S) { 821 assert(S->getEntity() == CurContext && "Context imbalance!"); 822 823 // Switch back to the lexical context. The safety of this is 824 // enforced by an assert in EnterDeclaratorContext. 825 Scope *Ancestor = S->getParent(); 826 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 827 CurContext = (DeclContext*) Ancestor->getEntity(); 828 829 // We don't need to do anything with the scope, which is going to 830 // disappear. 831} 832 833 834void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 835 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 836 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 837 // We assume that the caller has already called 838 // ActOnReenterTemplateScope 839 FD = TFD->getTemplatedDecl(); 840 } 841 if (!FD) 842 return; 843 844 PushDeclContext(S, FD); 845 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 846 ParmVarDecl *Param = FD->getParamDecl(P); 847 // If the parameter has an identifier, then add it to the scope 848 if (Param->getIdentifier()) { 849 S->AddDecl(Param); 850 IdResolver.AddDecl(Param); 851 } 852 } 853} 854 855 856/// \brief Determine whether we allow overloading of the function 857/// PrevDecl with another declaration. 858/// 859/// This routine determines whether overloading is possible, not 860/// whether some new function is actually an overload. It will return 861/// true in C++ (where we can always provide overloads) or, as an 862/// extension, in C when the previous function is already an 863/// overloaded function declaration or has the "overloadable" 864/// attribute. 865static bool AllowOverloadingOfFunction(LookupResult &Previous, 866 ASTContext &Context) { 867 if (Context.getLangOptions().CPlusPlus) 868 return true; 869 870 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 871 return true; 872 873 return (Previous.getResultKind() == LookupResult::Found 874 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 875} 876 877/// Add this decl to the scope shadowed decl chains. 878void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 879 // Move up the scope chain until we find the nearest enclosing 880 // non-transparent context. The declaration will be introduced into this 881 // scope. 882 while (S->getEntity() && 883 ((DeclContext *)S->getEntity())->isTransparentContext()) 884 S = S->getParent(); 885 886 // Add scoped declarations into their context, so that they can be 887 // found later. Declarations without a context won't be inserted 888 // into any context. 889 if (AddToContext) 890 CurContext->addDecl(D); 891 892 // Out-of-line definitions shouldn't be pushed into scope in C++. 893 // Out-of-line variable and function definitions shouldn't even in C. 894 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 895 D->isOutOfLine() && 896 !D->getDeclContext()->getRedeclContext()->Equals( 897 D->getLexicalDeclContext()->getRedeclContext())) 898 return; 899 900 // Template instantiations should also not be pushed into scope. 901 if (isa<FunctionDecl>(D) && 902 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 903 return; 904 905 // If this replaces anything in the current scope, 906 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 907 IEnd = IdResolver.end(); 908 for (; I != IEnd; ++I) { 909 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 910 S->RemoveDecl(*I); 911 IdResolver.RemoveDecl(*I); 912 913 // Should only need to replace one decl. 914 break; 915 } 916 } 917 918 S->AddDecl(D); 919 920 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 921 // Implicitly-generated labels may end up getting generated in an order that 922 // isn't strictly lexical, which breaks name lookup. Be careful to insert 923 // the label at the appropriate place in the identifier chain. 924 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 925 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 926 if (IDC == CurContext) { 927 if (!S->isDeclScope(*I)) 928 continue; 929 } else if (IDC->Encloses(CurContext)) 930 break; 931 } 932 933 IdResolver.InsertDeclAfter(I, D); 934 } else { 935 IdResolver.AddDecl(D); 936 } 937} 938 939bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 940 bool ExplicitInstantiationOrSpecialization) { 941 return IdResolver.isDeclInScope(D, Ctx, Context, S, 942 ExplicitInstantiationOrSpecialization); 943} 944 945Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 946 DeclContext *TargetDC = DC->getPrimaryContext(); 947 do { 948 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 949 if (ScopeDC->getPrimaryContext() == TargetDC) 950 return S; 951 } while ((S = S->getParent())); 952 953 return 0; 954} 955 956static bool isOutOfScopePreviousDeclaration(NamedDecl *, 957 DeclContext*, 958 ASTContext&); 959 960/// Filters out lookup results that don't fall within the given scope 961/// as determined by isDeclInScope. 962void Sema::FilterLookupForScope(LookupResult &R, 963 DeclContext *Ctx, Scope *S, 964 bool ConsiderLinkage, 965 bool ExplicitInstantiationOrSpecialization) { 966 LookupResult::Filter F = R.makeFilter(); 967 while (F.hasNext()) { 968 NamedDecl *D = F.next(); 969 970 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 971 continue; 972 973 if (ConsiderLinkage && 974 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 975 continue; 976 977 F.erase(); 978 } 979 980 F.done(); 981} 982 983static bool isUsingDecl(NamedDecl *D) { 984 return isa<UsingShadowDecl>(D) || 985 isa<UnresolvedUsingTypenameDecl>(D) || 986 isa<UnresolvedUsingValueDecl>(D); 987} 988 989/// Removes using shadow declarations from the lookup results. 990static void RemoveUsingDecls(LookupResult &R) { 991 LookupResult::Filter F = R.makeFilter(); 992 while (F.hasNext()) 993 if (isUsingDecl(F.next())) 994 F.erase(); 995 996 F.done(); 997} 998 999/// \brief Check for this common pattern: 1000/// @code 1001/// class S { 1002/// S(const S&); // DO NOT IMPLEMENT 1003/// void operator=(const S&); // DO NOT IMPLEMENT 1004/// }; 1005/// @endcode 1006static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1007 // FIXME: Should check for private access too but access is set after we get 1008 // the decl here. 1009 if (D->doesThisDeclarationHaveABody()) 1010 return false; 1011 1012 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1013 return CD->isCopyConstructor(); 1014 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1015 return Method->isCopyAssignmentOperator(); 1016 return false; 1017} 1018 1019bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1020 assert(D); 1021 1022 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1023 return false; 1024 1025 // Ignore class templates. 1026 if (D->getDeclContext()->isDependentContext() || 1027 D->getLexicalDeclContext()->isDependentContext()) 1028 return false; 1029 1030 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1031 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1032 return false; 1033 1034 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1035 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1036 return false; 1037 } else { 1038 // 'static inline' functions are used in headers; don't warn. 1039 if (FD->getStorageClass() == SC_Static && 1040 FD->isInlineSpecified()) 1041 return false; 1042 } 1043 1044 if (FD->doesThisDeclarationHaveABody() && 1045 Context.DeclMustBeEmitted(FD)) 1046 return false; 1047 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1048 if (!VD->isFileVarDecl() || 1049 VD->getType().isConstant(Context) || 1050 Context.DeclMustBeEmitted(VD)) 1051 return false; 1052 1053 if (VD->isStaticDataMember() && 1054 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1055 return false; 1056 1057 } else { 1058 return false; 1059 } 1060 1061 // Only warn for unused decls internal to the translation unit. 1062 if (D->getLinkage() == ExternalLinkage) 1063 return false; 1064 1065 return true; 1066} 1067 1068void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1069 if (!D) 1070 return; 1071 1072 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1073 const FunctionDecl *First = FD->getFirstDeclaration(); 1074 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1075 return; // First should already be in the vector. 1076 } 1077 1078 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1079 const VarDecl *First = VD->getFirstDeclaration(); 1080 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1085 UnusedFileScopedDecls.push_back(D); 1086 } 1087 1088static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1089 if (D->isInvalidDecl()) 1090 return false; 1091 1092 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1093 return false; 1094 1095 if (isa<LabelDecl>(D)) 1096 return true; 1097 1098 // White-list anything that isn't a local variable. 1099 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1100 !D->getDeclContext()->isFunctionOrMethod()) 1101 return false; 1102 1103 // Types of valid local variables should be complete, so this should succeed. 1104 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1105 1106 // White-list anything with an __attribute__((unused)) type. 1107 QualType Ty = VD->getType(); 1108 1109 // Only look at the outermost level of typedef. 1110 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1111 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1112 return false; 1113 } 1114 1115 // If we failed to complete the type for some reason, or if the type is 1116 // dependent, don't diagnose the variable. 1117 if (Ty->isIncompleteType() || Ty->isDependentType()) 1118 return false; 1119 1120 if (const TagType *TT = Ty->getAs<TagType>()) { 1121 const TagDecl *Tag = TT->getDecl(); 1122 if (Tag->hasAttr<UnusedAttr>()) 1123 return false; 1124 1125 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1126 // FIXME: Checking for the presence of a user-declared constructor 1127 // isn't completely accurate; we'd prefer to check that the initializer 1128 // has no side effects. 1129 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1130 return false; 1131 } 1132 } 1133 1134 // TODO: __attribute__((unused)) templates? 1135 } 1136 1137 return true; 1138} 1139 1140static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1141 FixItHint &Hint) { 1142 if (isa<LabelDecl>(D)) { 1143 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1144 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1145 if (AfterColon.isInvalid()) 1146 return; 1147 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1148 getCharRange(D->getLocStart(), AfterColon)); 1149 } 1150 return; 1151} 1152 1153/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1154/// unless they are marked attr(unused). 1155void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1156 FixItHint Hint; 1157 if (!ShouldDiagnoseUnusedDecl(D)) 1158 return; 1159 1160 GenerateFixForUnusedDecl(D, Context, Hint); 1161 1162 unsigned DiagID; 1163 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1164 DiagID = diag::warn_unused_exception_param; 1165 else if (isa<LabelDecl>(D)) 1166 DiagID = diag::warn_unused_label; 1167 else 1168 DiagID = diag::warn_unused_variable; 1169 1170 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1171} 1172 1173static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1174 // Verify that we have no forward references left. If so, there was a goto 1175 // or address of a label taken, but no definition of it. Label fwd 1176 // definitions are indicated with a null substmt. 1177 if (L->getStmt() == 0) 1178 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1179} 1180 1181void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1182 if (S->decl_empty()) return; 1183 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1184 "Scope shouldn't contain decls!"); 1185 1186 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1187 I != E; ++I) { 1188 Decl *TmpD = (*I); 1189 assert(TmpD && "This decl didn't get pushed??"); 1190 1191 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1192 NamedDecl *D = cast<NamedDecl>(TmpD); 1193 1194 if (!D->getDeclName()) continue; 1195 1196 // Diagnose unused variables in this scope. 1197 if (!S->hasErrorOccurred()) 1198 DiagnoseUnusedDecl(D); 1199 1200 // If this was a forward reference to a label, verify it was defined. 1201 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1202 CheckPoppedLabel(LD, *this); 1203 1204 // Remove this name from our lexical scope. 1205 IdResolver.RemoveDecl(D); 1206 } 1207} 1208 1209/// \brief Look for an Objective-C class in the translation unit. 1210/// 1211/// \param Id The name of the Objective-C class we're looking for. If 1212/// typo-correction fixes this name, the Id will be updated 1213/// to the fixed name. 1214/// 1215/// \param IdLoc The location of the name in the translation unit. 1216/// 1217/// \param TypoCorrection If true, this routine will attempt typo correction 1218/// if there is no class with the given name. 1219/// 1220/// \returns The declaration of the named Objective-C class, or NULL if the 1221/// class could not be found. 1222ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1223 SourceLocation IdLoc, 1224 bool DoTypoCorrection) { 1225 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1226 // creation from this context. 1227 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1228 1229 if (!IDecl && DoTypoCorrection) { 1230 // Perform typo correction at the given location, but only if we 1231 // find an Objective-C class name. 1232 TypoCorrection C; 1233 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1234 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1235 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1236 Diag(IdLoc, diag::err_undef_interface_suggest) 1237 << Id << IDecl->getDeclName() 1238 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1239 Diag(IDecl->getLocation(), diag::note_previous_decl) 1240 << IDecl->getDeclName(); 1241 1242 Id = IDecl->getIdentifier(); 1243 } 1244 } 1245 1246 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1247} 1248 1249/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1250/// from S, where a non-field would be declared. This routine copes 1251/// with the difference between C and C++ scoping rules in structs and 1252/// unions. For example, the following code is well-formed in C but 1253/// ill-formed in C++: 1254/// @code 1255/// struct S6 { 1256/// enum { BAR } e; 1257/// }; 1258/// 1259/// void test_S6() { 1260/// struct S6 a; 1261/// a.e = BAR; 1262/// } 1263/// @endcode 1264/// For the declaration of BAR, this routine will return a different 1265/// scope. The scope S will be the scope of the unnamed enumeration 1266/// within S6. In C++, this routine will return the scope associated 1267/// with S6, because the enumeration's scope is a transparent 1268/// context but structures can contain non-field names. In C, this 1269/// routine will return the translation unit scope, since the 1270/// enumeration's scope is a transparent context and structures cannot 1271/// contain non-field names. 1272Scope *Sema::getNonFieldDeclScope(Scope *S) { 1273 while (((S->getFlags() & Scope::DeclScope) == 0) || 1274 (S->getEntity() && 1275 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1276 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1277 S = S->getParent(); 1278 return S; 1279} 1280 1281/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1282/// file scope. lazily create a decl for it. ForRedeclaration is true 1283/// if we're creating this built-in in anticipation of redeclaring the 1284/// built-in. 1285NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1286 Scope *S, bool ForRedeclaration, 1287 SourceLocation Loc) { 1288 Builtin::ID BID = (Builtin::ID)bid; 1289 1290 ASTContext::GetBuiltinTypeError Error; 1291 QualType R = Context.GetBuiltinType(BID, Error); 1292 switch (Error) { 1293 case ASTContext::GE_None: 1294 // Okay 1295 break; 1296 1297 case ASTContext::GE_Missing_stdio: 1298 if (ForRedeclaration) 1299 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1300 << Context.BuiltinInfo.GetName(BID); 1301 return 0; 1302 1303 case ASTContext::GE_Missing_setjmp: 1304 if (ForRedeclaration) 1305 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1306 << Context.BuiltinInfo.GetName(BID); 1307 return 0; 1308 } 1309 1310 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1311 Diag(Loc, diag::ext_implicit_lib_function_decl) 1312 << Context.BuiltinInfo.GetName(BID) 1313 << R; 1314 if (Context.BuiltinInfo.getHeaderName(BID) && 1315 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1316 != DiagnosticsEngine::Ignored) 1317 Diag(Loc, diag::note_please_include_header) 1318 << Context.BuiltinInfo.getHeaderName(BID) 1319 << Context.BuiltinInfo.GetName(BID); 1320 } 1321 1322 FunctionDecl *New = FunctionDecl::Create(Context, 1323 Context.getTranslationUnitDecl(), 1324 Loc, Loc, II, R, /*TInfo=*/0, 1325 SC_Extern, 1326 SC_None, false, 1327 /*hasPrototype=*/true); 1328 New->setImplicit(); 1329 1330 // Create Decl objects for each parameter, adding them to the 1331 // FunctionDecl. 1332 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1333 SmallVector<ParmVarDecl*, 16> Params; 1334 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1335 ParmVarDecl *parm = 1336 ParmVarDecl::Create(Context, New, SourceLocation(), 1337 SourceLocation(), 0, 1338 FT->getArgType(i), /*TInfo=*/0, 1339 SC_None, SC_None, 0); 1340 parm->setScopeInfo(0, i); 1341 Params.push_back(parm); 1342 } 1343 New->setParams(Params); 1344 } 1345 1346 AddKnownFunctionAttributes(New); 1347 1348 // TUScope is the translation-unit scope to insert this function into. 1349 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1350 // relate Scopes to DeclContexts, and probably eliminate CurContext 1351 // entirely, but we're not there yet. 1352 DeclContext *SavedContext = CurContext; 1353 CurContext = Context.getTranslationUnitDecl(); 1354 PushOnScopeChains(New, TUScope); 1355 CurContext = SavedContext; 1356 return New; 1357} 1358 1359/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1360/// same name and scope as a previous declaration 'Old'. Figure out 1361/// how to resolve this situation, merging decls or emitting 1362/// diagnostics as appropriate. If there was an error, set New to be invalid. 1363/// 1364void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1365 // If the new decl is known invalid already, don't bother doing any 1366 // merging checks. 1367 if (New->isInvalidDecl()) return; 1368 1369 // Allow multiple definitions for ObjC built-in typedefs. 1370 // FIXME: Verify the underlying types are equivalent! 1371 if (getLangOptions().ObjC1) { 1372 const IdentifierInfo *TypeID = New->getIdentifier(); 1373 switch (TypeID->getLength()) { 1374 default: break; 1375 case 2: 1376 if (!TypeID->isStr("id")) 1377 break; 1378 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1379 // Install the built-in type for 'id', ignoring the current definition. 1380 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1381 return; 1382 case 5: 1383 if (!TypeID->isStr("Class")) 1384 break; 1385 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1386 // Install the built-in type for 'Class', ignoring the current definition. 1387 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1388 return; 1389 case 3: 1390 if (!TypeID->isStr("SEL")) 1391 break; 1392 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1393 // Install the built-in type for 'SEL', ignoring the current definition. 1394 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1395 return; 1396 } 1397 // Fall through - the typedef name was not a builtin type. 1398 } 1399 1400 // Verify the old decl was also a type. 1401 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1402 if (!Old) { 1403 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1404 << New->getDeclName(); 1405 1406 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1407 if (OldD->getLocation().isValid()) 1408 Diag(OldD->getLocation(), diag::note_previous_definition); 1409 1410 return New->setInvalidDecl(); 1411 } 1412 1413 // If the old declaration is invalid, just give up here. 1414 if (Old->isInvalidDecl()) 1415 return New->setInvalidDecl(); 1416 1417 // Determine the "old" type we'll use for checking and diagnostics. 1418 QualType OldType; 1419 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1420 OldType = OldTypedef->getUnderlyingType(); 1421 else 1422 OldType = Context.getTypeDeclType(Old); 1423 1424 // If the typedef types are not identical, reject them in all languages and 1425 // with any extensions enabled. 1426 1427 if (OldType != New->getUnderlyingType() && 1428 Context.getCanonicalType(OldType) != 1429 Context.getCanonicalType(New->getUnderlyingType())) { 1430 int Kind = 0; 1431 if (isa<TypeAliasDecl>(Old)) 1432 Kind = 1; 1433 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1434 << Kind << New->getUnderlyingType() << OldType; 1435 if (Old->getLocation().isValid()) 1436 Diag(Old->getLocation(), diag::note_previous_definition); 1437 return New->setInvalidDecl(); 1438 } 1439 1440 // The types match. Link up the redeclaration chain if the old 1441 // declaration was a typedef. 1442 // FIXME: this is a potential source of weirdness if the type 1443 // spellings don't match exactly. 1444 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1445 New->setPreviousDeclaration(Typedef); 1446 1447 // __module_private__ is propagated to later declarations. 1448 if (Old->isModulePrivate()) 1449 New->setModulePrivate(); 1450 else if (New->isModulePrivate()) 1451 diagnoseModulePrivateRedeclaration(New, Old); 1452 1453 if (getLangOptions().MicrosoftExt) 1454 return; 1455 1456 if (getLangOptions().CPlusPlus) { 1457 // C++ [dcl.typedef]p2: 1458 // In a given non-class scope, a typedef specifier can be used to 1459 // redefine the name of any type declared in that scope to refer 1460 // to the type to which it already refers. 1461 if (!isa<CXXRecordDecl>(CurContext)) 1462 return; 1463 1464 // C++0x [dcl.typedef]p4: 1465 // In a given class scope, a typedef specifier can be used to redefine 1466 // any class-name declared in that scope that is not also a typedef-name 1467 // to refer to the type to which it already refers. 1468 // 1469 // This wording came in via DR424, which was a correction to the 1470 // wording in DR56, which accidentally banned code like: 1471 // 1472 // struct S { 1473 // typedef struct A { } A; 1474 // }; 1475 // 1476 // in the C++03 standard. We implement the C++0x semantics, which 1477 // allow the above but disallow 1478 // 1479 // struct S { 1480 // typedef int I; 1481 // typedef int I; 1482 // }; 1483 // 1484 // since that was the intent of DR56. 1485 if (!isa<TypedefNameDecl>(Old)) 1486 return; 1487 1488 Diag(New->getLocation(), diag::err_redefinition) 1489 << New->getDeclName(); 1490 Diag(Old->getLocation(), diag::note_previous_definition); 1491 return New->setInvalidDecl(); 1492 } 1493 1494 // If we have a redefinition of a typedef in C, emit a warning. This warning 1495 // is normally mapped to an error, but can be controlled with 1496 // -Wtypedef-redefinition. If either the original or the redefinition is 1497 // in a system header, don't emit this for compatibility with GCC. 1498 if (getDiagnostics().getSuppressSystemWarnings() && 1499 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1500 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1501 return; 1502 1503 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1504 << New->getDeclName(); 1505 Diag(Old->getLocation(), diag::note_previous_definition); 1506 return; 1507} 1508 1509/// DeclhasAttr - returns true if decl Declaration already has the target 1510/// attribute. 1511static bool 1512DeclHasAttr(const Decl *D, const Attr *A) { 1513 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1514 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1515 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1516 if ((*i)->getKind() == A->getKind()) { 1517 if (Ann) { 1518 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1519 return true; 1520 continue; 1521 } 1522 // FIXME: Don't hardcode this check 1523 if (OA && isa<OwnershipAttr>(*i)) 1524 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1525 return true; 1526 } 1527 1528 return false; 1529} 1530 1531/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1532static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1533 ASTContext &C, bool mergeDeprecation = true) { 1534 if (!oldDecl->hasAttrs()) 1535 return; 1536 1537 bool foundAny = newDecl->hasAttrs(); 1538 1539 // Ensure that any moving of objects within the allocated map is done before 1540 // we process them. 1541 if (!foundAny) newDecl->setAttrs(AttrVec()); 1542 1543 for (specific_attr_iterator<InheritableAttr> 1544 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1545 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1546 // Ignore deprecated/unavailable/availability attributes if requested. 1547 if (!mergeDeprecation && 1548 (isa<DeprecatedAttr>(*i) || 1549 isa<UnavailableAttr>(*i) || 1550 isa<AvailabilityAttr>(*i))) 1551 continue; 1552 1553 if (!DeclHasAttr(newDecl, *i)) { 1554 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1555 newAttr->setInherited(true); 1556 newDecl->addAttr(newAttr); 1557 foundAny = true; 1558 } 1559 } 1560 1561 if (!foundAny) newDecl->dropAttrs(); 1562} 1563 1564/// mergeParamDeclAttributes - Copy attributes from the old parameter 1565/// to the new one. 1566static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1567 const ParmVarDecl *oldDecl, 1568 ASTContext &C) { 1569 if (!oldDecl->hasAttrs()) 1570 return; 1571 1572 bool foundAny = newDecl->hasAttrs(); 1573 1574 // Ensure that any moving of objects within the allocated map is 1575 // done before we process them. 1576 if (!foundAny) newDecl->setAttrs(AttrVec()); 1577 1578 for (specific_attr_iterator<InheritableParamAttr> 1579 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1580 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1581 if (!DeclHasAttr(newDecl, *i)) { 1582 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1583 newAttr->setInherited(true); 1584 newDecl->addAttr(newAttr); 1585 foundAny = true; 1586 } 1587 } 1588 1589 if (!foundAny) newDecl->dropAttrs(); 1590} 1591 1592namespace { 1593 1594/// Used in MergeFunctionDecl to keep track of function parameters in 1595/// C. 1596struct GNUCompatibleParamWarning { 1597 ParmVarDecl *OldParm; 1598 ParmVarDecl *NewParm; 1599 QualType PromotedType; 1600}; 1601 1602} 1603 1604/// getSpecialMember - get the special member enum for a method. 1605Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1606 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1607 if (Ctor->isDefaultConstructor()) 1608 return Sema::CXXDefaultConstructor; 1609 1610 if (Ctor->isCopyConstructor()) 1611 return Sema::CXXCopyConstructor; 1612 1613 if (Ctor->isMoveConstructor()) 1614 return Sema::CXXMoveConstructor; 1615 } else if (isa<CXXDestructorDecl>(MD)) { 1616 return Sema::CXXDestructor; 1617 } else if (MD->isCopyAssignmentOperator()) { 1618 return Sema::CXXCopyAssignment; 1619 } else if (MD->isMoveAssignmentOperator()) { 1620 return Sema::CXXMoveAssignment; 1621 } 1622 1623 return Sema::CXXInvalid; 1624} 1625 1626/// canRedefineFunction - checks if a function can be redefined. Currently, 1627/// only extern inline functions can be redefined, and even then only in 1628/// GNU89 mode. 1629static bool canRedefineFunction(const FunctionDecl *FD, 1630 const LangOptions& LangOpts) { 1631 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1632 !LangOpts.CPlusPlus && 1633 FD->isInlineSpecified() && 1634 FD->getStorageClass() == SC_Extern); 1635} 1636 1637/// MergeFunctionDecl - We just parsed a function 'New' from 1638/// declarator D which has the same name and scope as a previous 1639/// declaration 'Old'. Figure out how to resolve this situation, 1640/// merging decls or emitting diagnostics as appropriate. 1641/// 1642/// In C++, New and Old must be declarations that are not 1643/// overloaded. Use IsOverload to determine whether New and Old are 1644/// overloaded, and to select the Old declaration that New should be 1645/// merged with. 1646/// 1647/// Returns true if there was an error, false otherwise. 1648bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1649 // Verify the old decl was also a function. 1650 FunctionDecl *Old = 0; 1651 if (FunctionTemplateDecl *OldFunctionTemplate 1652 = dyn_cast<FunctionTemplateDecl>(OldD)) 1653 Old = OldFunctionTemplate->getTemplatedDecl(); 1654 else 1655 Old = dyn_cast<FunctionDecl>(OldD); 1656 if (!Old) { 1657 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1658 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1659 Diag(Shadow->getTargetDecl()->getLocation(), 1660 diag::note_using_decl_target); 1661 Diag(Shadow->getUsingDecl()->getLocation(), 1662 diag::note_using_decl) << 0; 1663 return true; 1664 } 1665 1666 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1667 << New->getDeclName(); 1668 Diag(OldD->getLocation(), diag::note_previous_definition); 1669 return true; 1670 } 1671 1672 // Determine whether the previous declaration was a definition, 1673 // implicit declaration, or a declaration. 1674 diag::kind PrevDiag; 1675 if (Old->isThisDeclarationADefinition()) 1676 PrevDiag = diag::note_previous_definition; 1677 else if (Old->isImplicit()) 1678 PrevDiag = diag::note_previous_implicit_declaration; 1679 else 1680 PrevDiag = diag::note_previous_declaration; 1681 1682 QualType OldQType = Context.getCanonicalType(Old->getType()); 1683 QualType NewQType = Context.getCanonicalType(New->getType()); 1684 1685 // Don't complain about this if we're in GNU89 mode and the old function 1686 // is an extern inline function. 1687 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1688 New->getStorageClass() == SC_Static && 1689 Old->getStorageClass() != SC_Static && 1690 !canRedefineFunction(Old, getLangOptions())) { 1691 if (getLangOptions().MicrosoftExt) { 1692 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1693 Diag(Old->getLocation(), PrevDiag); 1694 } else { 1695 Diag(New->getLocation(), diag::err_static_non_static) << New; 1696 Diag(Old->getLocation(), PrevDiag); 1697 return true; 1698 } 1699 } 1700 1701 // If a function is first declared with a calling convention, but is 1702 // later declared or defined without one, the second decl assumes the 1703 // calling convention of the first. 1704 // 1705 // For the new decl, we have to look at the NON-canonical type to tell the 1706 // difference between a function that really doesn't have a calling 1707 // convention and one that is declared cdecl. That's because in 1708 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1709 // because it is the default calling convention. 1710 // 1711 // Note also that we DO NOT return at this point, because we still have 1712 // other tests to run. 1713 const FunctionType *OldType = cast<FunctionType>(OldQType); 1714 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1715 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1716 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1717 bool RequiresAdjustment = false; 1718 if (OldTypeInfo.getCC() != CC_Default && 1719 NewTypeInfo.getCC() == CC_Default) { 1720 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1721 RequiresAdjustment = true; 1722 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1723 NewTypeInfo.getCC())) { 1724 // Calling conventions really aren't compatible, so complain. 1725 Diag(New->getLocation(), diag::err_cconv_change) 1726 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1727 << (OldTypeInfo.getCC() == CC_Default) 1728 << (OldTypeInfo.getCC() == CC_Default ? "" : 1729 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1730 Diag(Old->getLocation(), diag::note_previous_declaration); 1731 return true; 1732 } 1733 1734 // FIXME: diagnose the other way around? 1735 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1736 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1737 RequiresAdjustment = true; 1738 } 1739 1740 // Merge regparm attribute. 1741 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1742 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1743 if (NewTypeInfo.getHasRegParm()) { 1744 Diag(New->getLocation(), diag::err_regparm_mismatch) 1745 << NewType->getRegParmType() 1746 << OldType->getRegParmType(); 1747 Diag(Old->getLocation(), diag::note_previous_declaration); 1748 return true; 1749 } 1750 1751 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1752 RequiresAdjustment = true; 1753 } 1754 1755 // Merge ns_returns_retained attribute. 1756 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1757 if (NewTypeInfo.getProducesResult()) { 1758 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1759 Diag(Old->getLocation(), diag::note_previous_declaration); 1760 return true; 1761 } 1762 1763 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1764 RequiresAdjustment = true; 1765 } 1766 1767 if (RequiresAdjustment) { 1768 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1769 New->setType(QualType(NewType, 0)); 1770 NewQType = Context.getCanonicalType(New->getType()); 1771 } 1772 1773 if (getLangOptions().CPlusPlus) { 1774 // (C++98 13.1p2): 1775 // Certain function declarations cannot be overloaded: 1776 // -- Function declarations that differ only in the return type 1777 // cannot be overloaded. 1778 QualType OldReturnType = OldType->getResultType(); 1779 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1780 QualType ResQT; 1781 if (OldReturnType != NewReturnType) { 1782 if (NewReturnType->isObjCObjectPointerType() 1783 && OldReturnType->isObjCObjectPointerType()) 1784 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1785 if (ResQT.isNull()) { 1786 if (New->isCXXClassMember() && New->isOutOfLine()) 1787 Diag(New->getLocation(), 1788 diag::err_member_def_does_not_match_ret_type) << New; 1789 else 1790 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1791 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1792 return true; 1793 } 1794 else 1795 NewQType = ResQT; 1796 } 1797 1798 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1799 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1800 if (OldMethod && NewMethod) { 1801 // Preserve triviality. 1802 NewMethod->setTrivial(OldMethod->isTrivial()); 1803 1804 // MSVC allows explicit template specialization at class scope: 1805 // 2 CXMethodDecls referring to the same function will be injected. 1806 // We don't want a redeclartion error. 1807 bool IsClassScopeExplicitSpecialization = 1808 OldMethod->isFunctionTemplateSpecialization() && 1809 NewMethod->isFunctionTemplateSpecialization(); 1810 bool isFriend = NewMethod->getFriendObjectKind(); 1811 1812 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1813 !IsClassScopeExplicitSpecialization) { 1814 // -- Member function declarations with the same name and the 1815 // same parameter types cannot be overloaded if any of them 1816 // is a static member function declaration. 1817 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1818 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1819 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1820 return true; 1821 } 1822 1823 // C++ [class.mem]p1: 1824 // [...] A member shall not be declared twice in the 1825 // member-specification, except that a nested class or member 1826 // class template can be declared and then later defined. 1827 unsigned NewDiag; 1828 if (isa<CXXConstructorDecl>(OldMethod)) 1829 NewDiag = diag::err_constructor_redeclared; 1830 else if (isa<CXXDestructorDecl>(NewMethod)) 1831 NewDiag = diag::err_destructor_redeclared; 1832 else if (isa<CXXConversionDecl>(NewMethod)) 1833 NewDiag = diag::err_conv_function_redeclared; 1834 else 1835 NewDiag = diag::err_member_redeclared; 1836 1837 Diag(New->getLocation(), NewDiag); 1838 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1839 1840 // Complain if this is an explicit declaration of a special 1841 // member that was initially declared implicitly. 1842 // 1843 // As an exception, it's okay to befriend such methods in order 1844 // to permit the implicit constructor/destructor/operator calls. 1845 } else if (OldMethod->isImplicit()) { 1846 if (isFriend) { 1847 NewMethod->setImplicit(); 1848 } else { 1849 Diag(NewMethod->getLocation(), 1850 diag::err_definition_of_implicitly_declared_member) 1851 << New << getSpecialMember(OldMethod); 1852 return true; 1853 } 1854 } else if (OldMethod->isExplicitlyDefaulted()) { 1855 Diag(NewMethod->getLocation(), 1856 diag::err_definition_of_explicitly_defaulted_member) 1857 << getSpecialMember(OldMethod); 1858 return true; 1859 } 1860 } 1861 1862 // (C++98 8.3.5p3): 1863 // All declarations for a function shall agree exactly in both the 1864 // return type and the parameter-type-list. 1865 // We also want to respect all the extended bits except noreturn. 1866 1867 // noreturn should now match unless the old type info didn't have it. 1868 QualType OldQTypeForComparison = OldQType; 1869 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1870 assert(OldQType == QualType(OldType, 0)); 1871 const FunctionType *OldTypeForComparison 1872 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1873 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1874 assert(OldQTypeForComparison.isCanonical()); 1875 } 1876 1877 if (OldQTypeForComparison == NewQType) 1878 return MergeCompatibleFunctionDecls(New, Old); 1879 1880 // Fall through for conflicting redeclarations and redefinitions. 1881 } 1882 1883 // C: Function types need to be compatible, not identical. This handles 1884 // duplicate function decls like "void f(int); void f(enum X);" properly. 1885 if (!getLangOptions().CPlusPlus && 1886 Context.typesAreCompatible(OldQType, NewQType)) { 1887 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1888 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1889 const FunctionProtoType *OldProto = 0; 1890 if (isa<FunctionNoProtoType>(NewFuncType) && 1891 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1892 // The old declaration provided a function prototype, but the 1893 // new declaration does not. Merge in the prototype. 1894 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1895 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1896 OldProto->arg_type_end()); 1897 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1898 ParamTypes.data(), ParamTypes.size(), 1899 OldProto->getExtProtoInfo()); 1900 New->setType(NewQType); 1901 New->setHasInheritedPrototype(); 1902 1903 // Synthesize a parameter for each argument type. 1904 SmallVector<ParmVarDecl*, 16> Params; 1905 for (FunctionProtoType::arg_type_iterator 1906 ParamType = OldProto->arg_type_begin(), 1907 ParamEnd = OldProto->arg_type_end(); 1908 ParamType != ParamEnd; ++ParamType) { 1909 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1910 SourceLocation(), 1911 SourceLocation(), 0, 1912 *ParamType, /*TInfo=*/0, 1913 SC_None, SC_None, 1914 0); 1915 Param->setScopeInfo(0, Params.size()); 1916 Param->setImplicit(); 1917 Params.push_back(Param); 1918 } 1919 1920 New->setParams(Params); 1921 } 1922 1923 return MergeCompatibleFunctionDecls(New, Old); 1924 } 1925 1926 // GNU C permits a K&R definition to follow a prototype declaration 1927 // if the declared types of the parameters in the K&R definition 1928 // match the types in the prototype declaration, even when the 1929 // promoted types of the parameters from the K&R definition differ 1930 // from the types in the prototype. GCC then keeps the types from 1931 // the prototype. 1932 // 1933 // If a variadic prototype is followed by a non-variadic K&R definition, 1934 // the K&R definition becomes variadic. This is sort of an edge case, but 1935 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1936 // C99 6.9.1p8. 1937 if (!getLangOptions().CPlusPlus && 1938 Old->hasPrototype() && !New->hasPrototype() && 1939 New->getType()->getAs<FunctionProtoType>() && 1940 Old->getNumParams() == New->getNumParams()) { 1941 SmallVector<QualType, 16> ArgTypes; 1942 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1943 const FunctionProtoType *OldProto 1944 = Old->getType()->getAs<FunctionProtoType>(); 1945 const FunctionProtoType *NewProto 1946 = New->getType()->getAs<FunctionProtoType>(); 1947 1948 // Determine whether this is the GNU C extension. 1949 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1950 NewProto->getResultType()); 1951 bool LooseCompatible = !MergedReturn.isNull(); 1952 for (unsigned Idx = 0, End = Old->getNumParams(); 1953 LooseCompatible && Idx != End; ++Idx) { 1954 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1955 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1956 if (Context.typesAreCompatible(OldParm->getType(), 1957 NewProto->getArgType(Idx))) { 1958 ArgTypes.push_back(NewParm->getType()); 1959 } else if (Context.typesAreCompatible(OldParm->getType(), 1960 NewParm->getType(), 1961 /*CompareUnqualified=*/true)) { 1962 GNUCompatibleParamWarning Warn 1963 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1964 Warnings.push_back(Warn); 1965 ArgTypes.push_back(NewParm->getType()); 1966 } else 1967 LooseCompatible = false; 1968 } 1969 1970 if (LooseCompatible) { 1971 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1972 Diag(Warnings[Warn].NewParm->getLocation(), 1973 diag::ext_param_promoted_not_compatible_with_prototype) 1974 << Warnings[Warn].PromotedType 1975 << Warnings[Warn].OldParm->getType(); 1976 if (Warnings[Warn].OldParm->getLocation().isValid()) 1977 Diag(Warnings[Warn].OldParm->getLocation(), 1978 diag::note_previous_declaration); 1979 } 1980 1981 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1982 ArgTypes.size(), 1983 OldProto->getExtProtoInfo())); 1984 return MergeCompatibleFunctionDecls(New, Old); 1985 } 1986 1987 // Fall through to diagnose conflicting types. 1988 } 1989 1990 // A function that has already been declared has been redeclared or defined 1991 // with a different type- show appropriate diagnostic 1992 if (unsigned BuiltinID = Old->getBuiltinID()) { 1993 // The user has declared a builtin function with an incompatible 1994 // signature. 1995 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1996 // The function the user is redeclaring is a library-defined 1997 // function like 'malloc' or 'printf'. Warn about the 1998 // redeclaration, then pretend that we don't know about this 1999 // library built-in. 2000 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2001 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2002 << Old << Old->getType(); 2003 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2004 Old->setInvalidDecl(); 2005 return false; 2006 } 2007 2008 PrevDiag = diag::note_previous_builtin_declaration; 2009 } 2010 2011 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2012 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2013 return true; 2014} 2015 2016/// \brief Completes the merge of two function declarations that are 2017/// known to be compatible. 2018/// 2019/// This routine handles the merging of attributes and other 2020/// properties of function declarations form the old declaration to 2021/// the new declaration, once we know that New is in fact a 2022/// redeclaration of Old. 2023/// 2024/// \returns false 2025bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2026 // Merge the attributes 2027 mergeDeclAttributes(New, Old, Context); 2028 2029 // Merge the storage class. 2030 if (Old->getStorageClass() != SC_Extern && 2031 Old->getStorageClass() != SC_None) 2032 New->setStorageClass(Old->getStorageClass()); 2033 2034 // Merge "pure" flag. 2035 if (Old->isPure()) 2036 New->setPure(); 2037 2038 // __module_private__ is propagated to later declarations. 2039 if (Old->isModulePrivate()) 2040 New->setModulePrivate(); 2041 else if (New->isModulePrivate()) 2042 diagnoseModulePrivateRedeclaration(New, Old); 2043 2044 // Merge attributes from the parameters. These can mismatch with K&R 2045 // declarations. 2046 if (New->getNumParams() == Old->getNumParams()) 2047 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2048 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2049 Context); 2050 2051 if (getLangOptions().CPlusPlus) 2052 return MergeCXXFunctionDecl(New, Old); 2053 2054 return false; 2055} 2056 2057 2058void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2059 const ObjCMethodDecl *oldMethod) { 2060 // We don't want to merge unavailable and deprecated attributes 2061 // except from interface to implementation. 2062 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2063 2064 // Merge the attributes. 2065 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2066 2067 // Merge attributes from the parameters. 2068 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2069 for (ObjCMethodDecl::param_iterator 2070 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2071 ni != ne; ++ni, ++oi) 2072 mergeParamDeclAttributes(*ni, *oi, Context); 2073 2074 CheckObjCMethodOverride(newMethod, oldMethod, true); 2075} 2076 2077/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2078/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2079/// emitting diagnostics as appropriate. 2080/// 2081/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2082/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2083/// check them before the initializer is attached. 2084/// 2085void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2086 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2087 return; 2088 2089 QualType MergedT; 2090 if (getLangOptions().CPlusPlus) { 2091 AutoType *AT = New->getType()->getContainedAutoType(); 2092 if (AT && !AT->isDeduced()) { 2093 // We don't know what the new type is until the initializer is attached. 2094 return; 2095 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2096 // These could still be something that needs exception specs checked. 2097 return MergeVarDeclExceptionSpecs(New, Old); 2098 } 2099 // C++ [basic.link]p10: 2100 // [...] the types specified by all declarations referring to a given 2101 // object or function shall be identical, except that declarations for an 2102 // array object can specify array types that differ by the presence or 2103 // absence of a major array bound (8.3.4). 2104 else if (Old->getType()->isIncompleteArrayType() && 2105 New->getType()->isArrayType()) { 2106 CanQual<ArrayType> OldArray 2107 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2108 CanQual<ArrayType> NewArray 2109 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2110 if (OldArray->getElementType() == NewArray->getElementType()) 2111 MergedT = New->getType(); 2112 } else if (Old->getType()->isArrayType() && 2113 New->getType()->isIncompleteArrayType()) { 2114 CanQual<ArrayType> OldArray 2115 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2116 CanQual<ArrayType> NewArray 2117 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2118 if (OldArray->getElementType() == NewArray->getElementType()) 2119 MergedT = Old->getType(); 2120 } else if (New->getType()->isObjCObjectPointerType() 2121 && Old->getType()->isObjCObjectPointerType()) { 2122 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2123 Old->getType()); 2124 } 2125 } else { 2126 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2127 } 2128 if (MergedT.isNull()) { 2129 Diag(New->getLocation(), diag::err_redefinition_different_type) 2130 << New->getDeclName(); 2131 Diag(Old->getLocation(), diag::note_previous_definition); 2132 return New->setInvalidDecl(); 2133 } 2134 New->setType(MergedT); 2135} 2136 2137/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2138/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2139/// situation, merging decls or emitting diagnostics as appropriate. 2140/// 2141/// Tentative definition rules (C99 6.9.2p2) are checked by 2142/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2143/// definitions here, since the initializer hasn't been attached. 2144/// 2145void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2146 // If the new decl is already invalid, don't do any other checking. 2147 if (New->isInvalidDecl()) 2148 return; 2149 2150 // Verify the old decl was also a variable. 2151 VarDecl *Old = 0; 2152 if (!Previous.isSingleResult() || 2153 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2154 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2155 << New->getDeclName(); 2156 Diag(Previous.getRepresentativeDecl()->getLocation(), 2157 diag::note_previous_definition); 2158 return New->setInvalidDecl(); 2159 } 2160 2161 // C++ [class.mem]p1: 2162 // A member shall not be declared twice in the member-specification [...] 2163 // 2164 // Here, we need only consider static data members. 2165 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2166 Diag(New->getLocation(), diag::err_duplicate_member) 2167 << New->getIdentifier(); 2168 Diag(Old->getLocation(), diag::note_previous_declaration); 2169 New->setInvalidDecl(); 2170 } 2171 2172 mergeDeclAttributes(New, Old, Context); 2173 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2174 if (New->getAttr<WeakImportAttr>() && 2175 Old->getStorageClass() == SC_None && 2176 !Old->getAttr<WeakImportAttr>()) { 2177 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2178 Diag(Old->getLocation(), diag::note_previous_definition); 2179 // Remove weak_import attribute on new declaration. 2180 New->dropAttr<WeakImportAttr>(); 2181 } 2182 2183 // Merge the types. 2184 MergeVarDeclTypes(New, Old); 2185 if (New->isInvalidDecl()) 2186 return; 2187 2188 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2189 if (New->getStorageClass() == SC_Static && 2190 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2191 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 return New->setInvalidDecl(); 2194 } 2195 // C99 6.2.2p4: 2196 // For an identifier declared with the storage-class specifier 2197 // extern in a scope in which a prior declaration of that 2198 // identifier is visible,23) if the prior declaration specifies 2199 // internal or external linkage, the linkage of the identifier at 2200 // the later declaration is the same as the linkage specified at 2201 // the prior declaration. If no prior declaration is visible, or 2202 // if the prior declaration specifies no linkage, then the 2203 // identifier has external linkage. 2204 if (New->hasExternalStorage() && Old->hasLinkage()) 2205 /* Okay */; 2206 else if (New->getStorageClass() != SC_Static && 2207 Old->getStorageClass() == SC_Static) { 2208 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2209 Diag(Old->getLocation(), diag::note_previous_definition); 2210 return New->setInvalidDecl(); 2211 } 2212 2213 // Check if extern is followed by non-extern and vice-versa. 2214 if (New->hasExternalStorage() && 2215 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2216 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2217 Diag(Old->getLocation(), diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 if (Old->hasExternalStorage() && 2221 !New->hasLinkage() && New->isLocalVarDecl()) { 2222 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2223 Diag(Old->getLocation(), diag::note_previous_definition); 2224 return New->setInvalidDecl(); 2225 } 2226 2227 // __module_private__ is propagated to later declarations. 2228 if (Old->isModulePrivate()) 2229 New->setModulePrivate(); 2230 else if (New->isModulePrivate()) 2231 diagnoseModulePrivateRedeclaration(New, Old); 2232 2233 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2234 2235 // FIXME: The test for external storage here seems wrong? We still 2236 // need to check for mismatches. 2237 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2238 // Don't complain about out-of-line definitions of static members. 2239 !(Old->getLexicalDeclContext()->isRecord() && 2240 !New->getLexicalDeclContext()->isRecord())) { 2241 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2242 Diag(Old->getLocation(), diag::note_previous_definition); 2243 return New->setInvalidDecl(); 2244 } 2245 2246 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2247 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2248 Diag(Old->getLocation(), diag::note_previous_definition); 2249 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2250 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2251 Diag(Old->getLocation(), diag::note_previous_definition); 2252 } 2253 2254 // C++ doesn't have tentative definitions, so go right ahead and check here. 2255 const VarDecl *Def; 2256 if (getLangOptions().CPlusPlus && 2257 New->isThisDeclarationADefinition() == VarDecl::Definition && 2258 (Def = Old->getDefinition())) { 2259 Diag(New->getLocation(), diag::err_redefinition) 2260 << New->getDeclName(); 2261 Diag(Def->getLocation(), diag::note_previous_definition); 2262 New->setInvalidDecl(); 2263 return; 2264 } 2265 // c99 6.2.2 P4. 2266 // For an identifier declared with the storage-class specifier extern in a 2267 // scope in which a prior declaration of that identifier is visible, if 2268 // the prior declaration specifies internal or external linkage, the linkage 2269 // of the identifier at the later declaration is the same as the linkage 2270 // specified at the prior declaration. 2271 // FIXME. revisit this code. 2272 if (New->hasExternalStorage() && 2273 Old->getLinkage() == InternalLinkage && 2274 New->getDeclContext() == Old->getDeclContext()) 2275 New->setStorageClass(Old->getStorageClass()); 2276 2277 // Keep a chain of previous declarations. 2278 New->setPreviousDeclaration(Old); 2279 2280 // Inherit access appropriately. 2281 New->setAccess(Old->getAccess()); 2282} 2283 2284/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2285/// no declarator (e.g. "struct foo;") is parsed. 2286Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2287 DeclSpec &DS) { 2288 return ParsedFreeStandingDeclSpec(S, AS, DS, 2289 MultiTemplateParamsArg(*this, 0, 0)); 2290} 2291 2292/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2293/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2294/// parameters to cope with template friend declarations. 2295Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2296 DeclSpec &DS, 2297 MultiTemplateParamsArg TemplateParams) { 2298 Decl *TagD = 0; 2299 TagDecl *Tag = 0; 2300 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2301 DS.getTypeSpecType() == DeclSpec::TST_struct || 2302 DS.getTypeSpecType() == DeclSpec::TST_union || 2303 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2304 TagD = DS.getRepAsDecl(); 2305 2306 if (!TagD) // We probably had an error 2307 return 0; 2308 2309 // Note that the above type specs guarantee that the 2310 // type rep is a Decl, whereas in many of the others 2311 // it's a Type. 2312 Tag = dyn_cast<TagDecl>(TagD); 2313 } 2314 2315 if (Tag) 2316 Tag->setFreeStanding(); 2317 2318 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2319 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2320 // or incomplete types shall not be restrict-qualified." 2321 if (TypeQuals & DeclSpec::TQ_restrict) 2322 Diag(DS.getRestrictSpecLoc(), 2323 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2324 << DS.getSourceRange(); 2325 } 2326 2327 if (DS.isConstexprSpecified()) { 2328 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2329 // and definitions of functions and variables. 2330 if (Tag) 2331 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2332 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2333 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2334 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2335 else 2336 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2337 // Don't emit warnings after this error. 2338 return TagD; 2339 } 2340 2341 if (DS.isFriendSpecified()) { 2342 // If we're dealing with a decl but not a TagDecl, assume that 2343 // whatever routines created it handled the friendship aspect. 2344 if (TagD && !Tag) 2345 return 0; 2346 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2347 } 2348 2349 // Track whether we warned about the fact that there aren't any 2350 // declarators. 2351 bool emittedWarning = false; 2352 2353 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2354 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2355 2356 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2357 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2358 if (getLangOptions().CPlusPlus || 2359 Record->getDeclContext()->isRecord()) 2360 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2361 2362 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2363 << DS.getSourceRange(); 2364 emittedWarning = true; 2365 } 2366 } 2367 2368 // Check for Microsoft C extension: anonymous struct. 2369 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2370 CurContext->isRecord() && 2371 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2372 // Handle 2 kinds of anonymous struct: 2373 // struct STRUCT; 2374 // and 2375 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2376 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2377 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2378 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2379 DS.getRepAsType().get()->isStructureType())) { 2380 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2381 << DS.getSourceRange(); 2382 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2383 } 2384 } 2385 2386 if (getLangOptions().CPlusPlus && 2387 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2388 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2389 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2390 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2391 Diag(Enum->getLocation(), diag::ext_no_declarators) 2392 << DS.getSourceRange(); 2393 emittedWarning = true; 2394 } 2395 2396 // Skip all the checks below if we have a type error. 2397 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2398 2399 if (!DS.isMissingDeclaratorOk()) { 2400 // Warn about typedefs of enums without names, since this is an 2401 // extension in both Microsoft and GNU. 2402 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2403 Tag && isa<EnumDecl>(Tag)) { 2404 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2405 << DS.getSourceRange(); 2406 return Tag; 2407 } 2408 2409 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2410 << DS.getSourceRange(); 2411 emittedWarning = true; 2412 } 2413 2414 // We're going to complain about a bunch of spurious specifiers; 2415 // only do this if we're declaring a tag, because otherwise we 2416 // should be getting diag::ext_no_declarators. 2417 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2418 return TagD; 2419 2420 // Note that a linkage-specification sets a storage class, but 2421 // 'extern "C" struct foo;' is actually valid and not theoretically 2422 // useless. 2423 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2424 if (!DS.isExternInLinkageSpec()) 2425 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2426 << DeclSpec::getSpecifierName(scs); 2427 2428 if (DS.isThreadSpecified()) 2429 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2430 if (DS.getTypeQualifiers()) { 2431 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2432 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2433 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2434 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2435 // Restrict is covered above. 2436 } 2437 if (DS.isInlineSpecified()) 2438 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2439 if (DS.isVirtualSpecified()) 2440 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2441 if (DS.isExplicitSpecified()) 2442 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2443 2444 if (DS.isModulePrivateSpecified() && 2445 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2446 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2447 << Tag->getTagKind() 2448 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2449 2450 // FIXME: Warn on useless attributes 2451 2452 return TagD; 2453} 2454 2455/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2456/// builds a statement for it and returns it so it is evaluated. 2457StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2458 StmtResult R; 2459 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2460 Expr *Exp = DS.getRepAsExpr(); 2461 QualType Ty = Exp->getType(); 2462 if (Ty->isPointerType()) { 2463 do 2464 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2465 while (Ty->isPointerType()); 2466 } 2467 if (Ty->isVariableArrayType()) { 2468 R = ActOnExprStmt(MakeFullExpr(Exp)); 2469 } 2470 } 2471 return R; 2472} 2473 2474/// We are trying to inject an anonymous member into the given scope; 2475/// check if there's an existing declaration that can't be overloaded. 2476/// 2477/// \return true if this is a forbidden redeclaration 2478static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2479 Scope *S, 2480 DeclContext *Owner, 2481 DeclarationName Name, 2482 SourceLocation NameLoc, 2483 unsigned diagnostic) { 2484 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2485 Sema::ForRedeclaration); 2486 if (!SemaRef.LookupName(R, S)) return false; 2487 2488 if (R.getAsSingle<TagDecl>()) 2489 return false; 2490 2491 // Pick a representative declaration. 2492 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2493 assert(PrevDecl && "Expected a non-null Decl"); 2494 2495 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2496 return false; 2497 2498 SemaRef.Diag(NameLoc, diagnostic) << Name; 2499 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2500 2501 return true; 2502} 2503 2504/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2505/// anonymous struct or union AnonRecord into the owning context Owner 2506/// and scope S. This routine will be invoked just after we realize 2507/// that an unnamed union or struct is actually an anonymous union or 2508/// struct, e.g., 2509/// 2510/// @code 2511/// union { 2512/// int i; 2513/// float f; 2514/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2515/// // f into the surrounding scope.x 2516/// @endcode 2517/// 2518/// This routine is recursive, injecting the names of nested anonymous 2519/// structs/unions into the owning context and scope as well. 2520static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2521 DeclContext *Owner, 2522 RecordDecl *AnonRecord, 2523 AccessSpecifier AS, 2524 SmallVector<NamedDecl*, 2> &Chaining, 2525 bool MSAnonStruct) { 2526 unsigned diagKind 2527 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2528 : diag::err_anonymous_struct_member_redecl; 2529 2530 bool Invalid = false; 2531 2532 // Look every FieldDecl and IndirectFieldDecl with a name. 2533 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2534 DEnd = AnonRecord->decls_end(); 2535 D != DEnd; ++D) { 2536 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2537 cast<NamedDecl>(*D)->getDeclName()) { 2538 ValueDecl *VD = cast<ValueDecl>(*D); 2539 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2540 VD->getLocation(), diagKind)) { 2541 // C++ [class.union]p2: 2542 // The names of the members of an anonymous union shall be 2543 // distinct from the names of any other entity in the 2544 // scope in which the anonymous union is declared. 2545 Invalid = true; 2546 } else { 2547 // C++ [class.union]p2: 2548 // For the purpose of name lookup, after the anonymous union 2549 // definition, the members of the anonymous union are 2550 // considered to have been defined in the scope in which the 2551 // anonymous union is declared. 2552 unsigned OldChainingSize = Chaining.size(); 2553 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2554 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2555 PE = IF->chain_end(); PI != PE; ++PI) 2556 Chaining.push_back(*PI); 2557 else 2558 Chaining.push_back(VD); 2559 2560 assert(Chaining.size() >= 2); 2561 NamedDecl **NamedChain = 2562 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2563 for (unsigned i = 0; i < Chaining.size(); i++) 2564 NamedChain[i] = Chaining[i]; 2565 2566 IndirectFieldDecl* IndirectField = 2567 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2568 VD->getIdentifier(), VD->getType(), 2569 NamedChain, Chaining.size()); 2570 2571 IndirectField->setAccess(AS); 2572 IndirectField->setImplicit(); 2573 SemaRef.PushOnScopeChains(IndirectField, S); 2574 2575 // That includes picking up the appropriate access specifier. 2576 if (AS != AS_none) IndirectField->setAccess(AS); 2577 2578 Chaining.resize(OldChainingSize); 2579 } 2580 } 2581 } 2582 2583 return Invalid; 2584} 2585 2586/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2587/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2588/// illegal input values are mapped to SC_None. 2589static StorageClass 2590StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2591 switch (StorageClassSpec) { 2592 case DeclSpec::SCS_unspecified: return SC_None; 2593 case DeclSpec::SCS_extern: return SC_Extern; 2594 case DeclSpec::SCS_static: return SC_Static; 2595 case DeclSpec::SCS_auto: return SC_Auto; 2596 case DeclSpec::SCS_register: return SC_Register; 2597 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2598 // Illegal SCSs map to None: error reporting is up to the caller. 2599 case DeclSpec::SCS_mutable: // Fall through. 2600 case DeclSpec::SCS_typedef: return SC_None; 2601 } 2602 llvm_unreachable("unknown storage class specifier"); 2603} 2604 2605/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2606/// a StorageClass. Any error reporting is up to the caller: 2607/// illegal input values are mapped to SC_None. 2608static StorageClass 2609StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2610 switch (StorageClassSpec) { 2611 case DeclSpec::SCS_unspecified: return SC_None; 2612 case DeclSpec::SCS_extern: return SC_Extern; 2613 case DeclSpec::SCS_static: return SC_Static; 2614 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2615 // Illegal SCSs map to None: error reporting is up to the caller. 2616 case DeclSpec::SCS_auto: // Fall through. 2617 case DeclSpec::SCS_mutable: // Fall through. 2618 case DeclSpec::SCS_register: // Fall through. 2619 case DeclSpec::SCS_typedef: return SC_None; 2620 } 2621 llvm_unreachable("unknown storage class specifier"); 2622} 2623 2624/// BuildAnonymousStructOrUnion - Handle the declaration of an 2625/// anonymous structure or union. Anonymous unions are a C++ feature 2626/// (C++ [class.union]) and a GNU C extension; anonymous structures 2627/// are a GNU C and GNU C++ extension. 2628Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2629 AccessSpecifier AS, 2630 RecordDecl *Record) { 2631 DeclContext *Owner = Record->getDeclContext(); 2632 2633 // Diagnose whether this anonymous struct/union is an extension. 2634 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2635 Diag(Record->getLocation(), diag::ext_anonymous_union); 2636 else if (!Record->isUnion()) 2637 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2638 2639 // C and C++ require different kinds of checks for anonymous 2640 // structs/unions. 2641 bool Invalid = false; 2642 if (getLangOptions().CPlusPlus) { 2643 const char* PrevSpec = 0; 2644 unsigned DiagID; 2645 if (Record->isUnion()) { 2646 // C++ [class.union]p6: 2647 // Anonymous unions declared in a named namespace or in the 2648 // global namespace shall be declared static. 2649 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2650 (isa<TranslationUnitDecl>(Owner) || 2651 (isa<NamespaceDecl>(Owner) && 2652 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2653 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2654 Invalid = true; 2655 2656 // Recover by adding 'static'. 2657 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2658 PrevSpec, DiagID); 2659 } 2660 // C++ [class.union]p6: 2661 // A storage class is not allowed in a declaration of an 2662 // anonymous union in a class scope. 2663 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2664 isa<RecordDecl>(Owner)) { 2665 Diag(DS.getStorageClassSpecLoc(), 2666 diag::err_anonymous_union_with_storage_spec); 2667 Invalid = true; 2668 2669 // Recover by removing the storage specifier. 2670 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(), 2671 PrevSpec, DiagID); 2672 } 2673 } 2674 2675 // Ignore const/volatile/restrict qualifiers. 2676 if (DS.getTypeQualifiers()) { 2677 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2678 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2679 << Record->isUnion() << 0 2680 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2681 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2682 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2683 << Record->isUnion() << 1 2684 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2685 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2686 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2687 << Record->isUnion() << 2 2688 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2689 2690 DS.ClearTypeQualifiers(); 2691 } 2692 2693 // C++ [class.union]p2: 2694 // The member-specification of an anonymous union shall only 2695 // define non-static data members. [Note: nested types and 2696 // functions cannot be declared within an anonymous union. ] 2697 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2698 MemEnd = Record->decls_end(); 2699 Mem != MemEnd; ++Mem) { 2700 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2701 // C++ [class.union]p3: 2702 // An anonymous union shall not have private or protected 2703 // members (clause 11). 2704 assert(FD->getAccess() != AS_none); 2705 if (FD->getAccess() != AS_public) { 2706 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2707 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2708 Invalid = true; 2709 } 2710 2711 // C++ [class.union]p1 2712 // An object of a class with a non-trivial constructor, a non-trivial 2713 // copy constructor, a non-trivial destructor, or a non-trivial copy 2714 // assignment operator cannot be a member of a union, nor can an 2715 // array of such objects. 2716 if (CheckNontrivialField(FD)) 2717 Invalid = true; 2718 } else if ((*Mem)->isImplicit()) { 2719 // Any implicit members are fine. 2720 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2721 // This is a type that showed up in an 2722 // elaborated-type-specifier inside the anonymous struct or 2723 // union, but which actually declares a type outside of the 2724 // anonymous struct or union. It's okay. 2725 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2726 if (!MemRecord->isAnonymousStructOrUnion() && 2727 MemRecord->getDeclName()) { 2728 // Visual C++ allows type definition in anonymous struct or union. 2729 if (getLangOptions().MicrosoftExt) 2730 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2731 << (int)Record->isUnion(); 2732 else { 2733 // This is a nested type declaration. 2734 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2735 << (int)Record->isUnion(); 2736 Invalid = true; 2737 } 2738 } 2739 } else if (isa<AccessSpecDecl>(*Mem)) { 2740 // Any access specifier is fine. 2741 } else { 2742 // We have something that isn't a non-static data 2743 // member. Complain about it. 2744 unsigned DK = diag::err_anonymous_record_bad_member; 2745 if (isa<TypeDecl>(*Mem)) 2746 DK = diag::err_anonymous_record_with_type; 2747 else if (isa<FunctionDecl>(*Mem)) 2748 DK = diag::err_anonymous_record_with_function; 2749 else if (isa<VarDecl>(*Mem)) 2750 DK = diag::err_anonymous_record_with_static; 2751 2752 // Visual C++ allows type definition in anonymous struct or union. 2753 if (getLangOptions().MicrosoftExt && 2754 DK == diag::err_anonymous_record_with_type) 2755 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2756 << (int)Record->isUnion(); 2757 else { 2758 Diag((*Mem)->getLocation(), DK) 2759 << (int)Record->isUnion(); 2760 Invalid = true; 2761 } 2762 } 2763 } 2764 } 2765 2766 if (!Record->isUnion() && !Owner->isRecord()) { 2767 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2768 << (int)getLangOptions().CPlusPlus; 2769 Invalid = true; 2770 } 2771 2772 // Mock up a declarator. 2773 Declarator Dc(DS, Declarator::MemberContext); 2774 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2775 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2776 2777 // Create a declaration for this anonymous struct/union. 2778 NamedDecl *Anon = 0; 2779 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2780 Anon = FieldDecl::Create(Context, OwningClass, 2781 DS.getSourceRange().getBegin(), 2782 Record->getLocation(), 2783 /*IdentifierInfo=*/0, 2784 Context.getTypeDeclType(Record), 2785 TInfo, 2786 /*BitWidth=*/0, /*Mutable=*/false, 2787 /*HasInit=*/false); 2788 Anon->setAccess(AS); 2789 if (getLangOptions().CPlusPlus) 2790 FieldCollector->Add(cast<FieldDecl>(Anon)); 2791 } else { 2792 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2793 assert(SCSpec != DeclSpec::SCS_typedef && 2794 "Parser allowed 'typedef' as storage class VarDecl."); 2795 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2796 if (SCSpec == DeclSpec::SCS_mutable) { 2797 // mutable can only appear on non-static class members, so it's always 2798 // an error here 2799 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2800 Invalid = true; 2801 SC = SC_None; 2802 } 2803 SCSpec = DS.getStorageClassSpecAsWritten(); 2804 VarDecl::StorageClass SCAsWritten 2805 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2806 2807 Anon = VarDecl::Create(Context, Owner, 2808 DS.getSourceRange().getBegin(), 2809 Record->getLocation(), /*IdentifierInfo=*/0, 2810 Context.getTypeDeclType(Record), 2811 TInfo, SC, SCAsWritten); 2812 2813 // Default-initialize the implicit variable. This initialization will be 2814 // trivial in almost all cases, except if a union member has an in-class 2815 // initializer: 2816 // union { int n = 0; }; 2817 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2818 } 2819 Anon->setImplicit(); 2820 2821 // Add the anonymous struct/union object to the current 2822 // context. We'll be referencing this object when we refer to one of 2823 // its members. 2824 Owner->addDecl(Anon); 2825 2826 // Inject the members of the anonymous struct/union into the owning 2827 // context and into the identifier resolver chain for name lookup 2828 // purposes. 2829 SmallVector<NamedDecl*, 2> Chain; 2830 Chain.push_back(Anon); 2831 2832 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2833 Chain, false)) 2834 Invalid = true; 2835 2836 // Mark this as an anonymous struct/union type. Note that we do not 2837 // do this until after we have already checked and injected the 2838 // members of this anonymous struct/union type, because otherwise 2839 // the members could be injected twice: once by DeclContext when it 2840 // builds its lookup table, and once by 2841 // InjectAnonymousStructOrUnionMembers. 2842 Record->setAnonymousStructOrUnion(true); 2843 2844 if (Invalid) 2845 Anon->setInvalidDecl(); 2846 2847 return Anon; 2848} 2849 2850/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2851/// Microsoft C anonymous structure. 2852/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2853/// Example: 2854/// 2855/// struct A { int a; }; 2856/// struct B { struct A; int b; }; 2857/// 2858/// void foo() { 2859/// B var; 2860/// var.a = 3; 2861/// } 2862/// 2863Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2864 RecordDecl *Record) { 2865 2866 // If there is no Record, get the record via the typedef. 2867 if (!Record) 2868 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2869 2870 // Mock up a declarator. 2871 Declarator Dc(DS, Declarator::TypeNameContext); 2872 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2873 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2874 2875 // Create a declaration for this anonymous struct. 2876 NamedDecl* Anon = FieldDecl::Create(Context, 2877 cast<RecordDecl>(CurContext), 2878 DS.getSourceRange().getBegin(), 2879 DS.getSourceRange().getBegin(), 2880 /*IdentifierInfo=*/0, 2881 Context.getTypeDeclType(Record), 2882 TInfo, 2883 /*BitWidth=*/0, /*Mutable=*/false, 2884 /*HasInit=*/false); 2885 Anon->setImplicit(); 2886 2887 // Add the anonymous struct object to the current context. 2888 CurContext->addDecl(Anon); 2889 2890 // Inject the members of the anonymous struct into the current 2891 // context and into the identifier resolver chain for name lookup 2892 // purposes. 2893 SmallVector<NamedDecl*, 2> Chain; 2894 Chain.push_back(Anon); 2895 2896 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2897 Record->getDefinition(), 2898 AS_none, Chain, true)) 2899 Anon->setInvalidDecl(); 2900 2901 return Anon; 2902} 2903 2904/// GetNameForDeclarator - Determine the full declaration name for the 2905/// given Declarator. 2906DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2907 return GetNameFromUnqualifiedId(D.getName()); 2908} 2909 2910/// \brief Retrieves the declaration name from a parsed unqualified-id. 2911DeclarationNameInfo 2912Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2913 DeclarationNameInfo NameInfo; 2914 NameInfo.setLoc(Name.StartLocation); 2915 2916 switch (Name.getKind()) { 2917 2918 case UnqualifiedId::IK_ImplicitSelfParam: 2919 case UnqualifiedId::IK_Identifier: 2920 NameInfo.setName(Name.Identifier); 2921 NameInfo.setLoc(Name.StartLocation); 2922 return NameInfo; 2923 2924 case UnqualifiedId::IK_OperatorFunctionId: 2925 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2926 Name.OperatorFunctionId.Operator)); 2927 NameInfo.setLoc(Name.StartLocation); 2928 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2929 = Name.OperatorFunctionId.SymbolLocations[0]; 2930 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2931 = Name.EndLocation.getRawEncoding(); 2932 return NameInfo; 2933 2934 case UnqualifiedId::IK_LiteralOperatorId: 2935 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2936 Name.Identifier)); 2937 NameInfo.setLoc(Name.StartLocation); 2938 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2939 return NameInfo; 2940 2941 case UnqualifiedId::IK_ConversionFunctionId: { 2942 TypeSourceInfo *TInfo; 2943 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2944 if (Ty.isNull()) 2945 return DeclarationNameInfo(); 2946 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2947 Context.getCanonicalType(Ty))); 2948 NameInfo.setLoc(Name.StartLocation); 2949 NameInfo.setNamedTypeInfo(TInfo); 2950 return NameInfo; 2951 } 2952 2953 case UnqualifiedId::IK_ConstructorName: { 2954 TypeSourceInfo *TInfo; 2955 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2956 if (Ty.isNull()) 2957 return DeclarationNameInfo(); 2958 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2959 Context.getCanonicalType(Ty))); 2960 NameInfo.setLoc(Name.StartLocation); 2961 NameInfo.setNamedTypeInfo(TInfo); 2962 return NameInfo; 2963 } 2964 2965 case UnqualifiedId::IK_ConstructorTemplateId: { 2966 // In well-formed code, we can only have a constructor 2967 // template-id that refers to the current context, so go there 2968 // to find the actual type being constructed. 2969 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2970 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2971 return DeclarationNameInfo(); 2972 2973 // Determine the type of the class being constructed. 2974 QualType CurClassType = Context.getTypeDeclType(CurClass); 2975 2976 // FIXME: Check two things: that the template-id names the same type as 2977 // CurClassType, and that the template-id does not occur when the name 2978 // was qualified. 2979 2980 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2981 Context.getCanonicalType(CurClassType))); 2982 NameInfo.setLoc(Name.StartLocation); 2983 // FIXME: should we retrieve TypeSourceInfo? 2984 NameInfo.setNamedTypeInfo(0); 2985 return NameInfo; 2986 } 2987 2988 case UnqualifiedId::IK_DestructorName: { 2989 TypeSourceInfo *TInfo; 2990 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2991 if (Ty.isNull()) 2992 return DeclarationNameInfo(); 2993 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2994 Context.getCanonicalType(Ty))); 2995 NameInfo.setLoc(Name.StartLocation); 2996 NameInfo.setNamedTypeInfo(TInfo); 2997 return NameInfo; 2998 } 2999 3000 case UnqualifiedId::IK_TemplateId: { 3001 TemplateName TName = Name.TemplateId->Template.get(); 3002 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3003 return Context.getNameForTemplate(TName, TNameLoc); 3004 } 3005 3006 } // switch (Name.getKind()) 3007 3008 llvm_unreachable("Unknown name kind"); 3009} 3010 3011static QualType getCoreType(QualType Ty) { 3012 do { 3013 if (Ty->isPointerType() || Ty->isReferenceType()) 3014 Ty = Ty->getPointeeType(); 3015 else if (Ty->isArrayType()) 3016 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3017 else 3018 return Ty.withoutLocalFastQualifiers(); 3019 } while (true); 3020} 3021 3022/// hasSimilarParameters - Determine whether the C++ functions Declaration 3023/// and Definition have "nearly" matching parameters. This heuristic is 3024/// used to improve diagnostics in the case where an out-of-line function 3025/// definition doesn't match any declaration within the class or namespace. 3026/// Also sets Params to the list of indices to the parameters that differ 3027/// between the declaration and the definition. If hasSimilarParameters 3028/// returns true and Params is empty, then all of the parameters match. 3029static bool hasSimilarParameters(ASTContext &Context, 3030 FunctionDecl *Declaration, 3031 FunctionDecl *Definition, 3032 llvm::SmallVectorImpl<unsigned> &Params) { 3033 Params.clear(); 3034 if (Declaration->param_size() != Definition->param_size()) 3035 return false; 3036 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3037 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3038 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3039 3040 // The parameter types are identical 3041 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3042 continue; 3043 3044 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3045 QualType DefParamBaseTy = getCoreType(DefParamTy); 3046 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3047 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3048 3049 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3050 (DeclTyName && DeclTyName == DefTyName)) 3051 Params.push_back(Idx); 3052 else // The two parameters aren't even close 3053 return false; 3054 } 3055 3056 return true; 3057} 3058 3059/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3060/// declarator needs to be rebuilt in the current instantiation. 3061/// Any bits of declarator which appear before the name are valid for 3062/// consideration here. That's specifically the type in the decl spec 3063/// and the base type in any member-pointer chunks. 3064static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3065 DeclarationName Name) { 3066 // The types we specifically need to rebuild are: 3067 // - typenames, typeofs, and decltypes 3068 // - types which will become injected class names 3069 // Of course, we also need to rebuild any type referencing such a 3070 // type. It's safest to just say "dependent", but we call out a 3071 // few cases here. 3072 3073 DeclSpec &DS = D.getMutableDeclSpec(); 3074 switch (DS.getTypeSpecType()) { 3075 case DeclSpec::TST_typename: 3076 case DeclSpec::TST_typeofType: 3077 case DeclSpec::TST_decltype: 3078 case DeclSpec::TST_underlyingType: 3079 case DeclSpec::TST_atomic: { 3080 // Grab the type from the parser. 3081 TypeSourceInfo *TSI = 0; 3082 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3083 if (T.isNull() || !T->isDependentType()) break; 3084 3085 // Make sure there's a type source info. This isn't really much 3086 // of a waste; most dependent types should have type source info 3087 // attached already. 3088 if (!TSI) 3089 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3090 3091 // Rebuild the type in the current instantiation. 3092 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3093 if (!TSI) return true; 3094 3095 // Store the new type back in the decl spec. 3096 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3097 DS.UpdateTypeRep(LocType); 3098 break; 3099 } 3100 3101 case DeclSpec::TST_typeofExpr: { 3102 Expr *E = DS.getRepAsExpr(); 3103 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3104 if (Result.isInvalid()) return true; 3105 DS.UpdateExprRep(Result.get()); 3106 break; 3107 } 3108 3109 default: 3110 // Nothing to do for these decl specs. 3111 break; 3112 } 3113 3114 // It doesn't matter what order we do this in. 3115 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3116 DeclaratorChunk &Chunk = D.getTypeObject(I); 3117 3118 // The only type information in the declarator which can come 3119 // before the declaration name is the base type of a member 3120 // pointer. 3121 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3122 continue; 3123 3124 // Rebuild the scope specifier in-place. 3125 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3126 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3127 return true; 3128 } 3129 3130 return false; 3131} 3132 3133Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3134 D.setFunctionDefinition(false); 3135 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3136} 3137 3138/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3139/// If T is the name of a class, then each of the following shall have a 3140/// name different from T: 3141/// - every static data member of class T; 3142/// - every member function of class T 3143/// - every member of class T that is itself a type; 3144/// \returns true if the declaration name violates these rules. 3145bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3146 DeclarationNameInfo NameInfo) { 3147 DeclarationName Name = NameInfo.getName(); 3148 3149 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3150 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3151 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3152 return true; 3153 } 3154 3155 return false; 3156} 3157 3158Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3159 MultiTemplateParamsArg TemplateParamLists) { 3160 // TODO: consider using NameInfo for diagnostic. 3161 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3162 DeclarationName Name = NameInfo.getName(); 3163 3164 // All of these full declarators require an identifier. If it doesn't have 3165 // one, the ParsedFreeStandingDeclSpec action should be used. 3166 if (!Name) { 3167 if (!D.isInvalidType()) // Reject this if we think it is valid. 3168 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3169 diag::err_declarator_need_ident) 3170 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3171 return 0; 3172 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3173 return 0; 3174 3175 // The scope passed in may not be a decl scope. Zip up the scope tree until 3176 // we find one that is. 3177 while ((S->getFlags() & Scope::DeclScope) == 0 || 3178 (S->getFlags() & Scope::TemplateParamScope) != 0) 3179 S = S->getParent(); 3180 3181 DeclContext *DC = CurContext; 3182 if (D.getCXXScopeSpec().isInvalid()) 3183 D.setInvalidType(); 3184 else if (D.getCXXScopeSpec().isSet()) { 3185 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3186 UPPC_DeclarationQualifier)) 3187 return 0; 3188 3189 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3190 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3191 if (!DC) { 3192 // If we could not compute the declaration context, it's because the 3193 // declaration context is dependent but does not refer to a class, 3194 // class template, or class template partial specialization. Complain 3195 // and return early, to avoid the coming semantic disaster. 3196 Diag(D.getIdentifierLoc(), 3197 diag::err_template_qualified_declarator_no_match) 3198 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3199 << D.getCXXScopeSpec().getRange(); 3200 return 0; 3201 } 3202 bool IsDependentContext = DC->isDependentContext(); 3203 3204 if (!IsDependentContext && 3205 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3206 return 0; 3207 3208 if (isa<CXXRecordDecl>(DC)) { 3209 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3210 Diag(D.getIdentifierLoc(), 3211 diag::err_member_def_undefined_record) 3212 << Name << DC << D.getCXXScopeSpec().getRange(); 3213 D.setInvalidType(); 3214 } else if (isa<CXXRecordDecl>(CurContext) && 3215 !D.getDeclSpec().isFriendSpecified()) { 3216 // The user provided a superfluous scope specifier inside a class 3217 // definition: 3218 // 3219 // class X { 3220 // void X::f(); 3221 // }; 3222 if (CurContext->Equals(DC)) 3223 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3224 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3225 else 3226 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3227 << Name << D.getCXXScopeSpec().getRange(); 3228 3229 // Pretend that this qualifier was not here. 3230 D.getCXXScopeSpec().clear(); 3231 } 3232 } 3233 3234 // Check whether we need to rebuild the type of the given 3235 // declaration in the current instantiation. 3236 if (EnteringContext && IsDependentContext && 3237 TemplateParamLists.size() != 0) { 3238 ContextRAII SavedContext(*this, DC); 3239 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3240 D.setInvalidType(); 3241 } 3242 } 3243 3244 if (DiagnoseClassNameShadow(DC, NameInfo)) 3245 // If this is a typedef, we'll end up spewing multiple diagnostics. 3246 // Just return early; it's safer. 3247 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3248 return 0; 3249 3250 NamedDecl *New; 3251 3252 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3253 QualType R = TInfo->getType(); 3254 3255 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3256 UPPC_DeclarationType)) 3257 D.setInvalidType(); 3258 3259 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3260 ForRedeclaration); 3261 3262 // See if this is a redefinition of a variable in the same scope. 3263 if (!D.getCXXScopeSpec().isSet()) { 3264 bool IsLinkageLookup = false; 3265 3266 // If the declaration we're planning to build will be a function 3267 // or object with linkage, then look for another declaration with 3268 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3269 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3270 /* Do nothing*/; 3271 else if (R->isFunctionType()) { 3272 if (CurContext->isFunctionOrMethod() || 3273 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3274 IsLinkageLookup = true; 3275 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3276 IsLinkageLookup = true; 3277 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3278 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3279 IsLinkageLookup = true; 3280 3281 if (IsLinkageLookup) 3282 Previous.clear(LookupRedeclarationWithLinkage); 3283 3284 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3285 } else { // Something like "int foo::x;" 3286 LookupQualifiedName(Previous, DC); 3287 3288 // Don't consider using declarations as previous declarations for 3289 // out-of-line members. 3290 RemoveUsingDecls(Previous); 3291 3292 // C++ 7.3.1.2p2: 3293 // Members (including explicit specializations of templates) of a named 3294 // namespace can also be defined outside that namespace by explicit 3295 // qualification of the name being defined, provided that the entity being 3296 // defined was already declared in the namespace and the definition appears 3297 // after the point of declaration in a namespace that encloses the 3298 // declarations namespace. 3299 // 3300 // Note that we only check the context at this point. We don't yet 3301 // have enough information to make sure that PrevDecl is actually 3302 // the declaration we want to match. For example, given: 3303 // 3304 // class X { 3305 // void f(); 3306 // void f(float); 3307 // }; 3308 // 3309 // void X::f(int) { } // ill-formed 3310 // 3311 // In this case, PrevDecl will point to the overload set 3312 // containing the two f's declared in X, but neither of them 3313 // matches. 3314 3315 // First check whether we named the global scope. 3316 if (isa<TranslationUnitDecl>(DC)) { 3317 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3318 << Name << D.getCXXScopeSpec().getRange(); 3319 } else { 3320 DeclContext *Cur = CurContext; 3321 while (isa<LinkageSpecDecl>(Cur)) 3322 Cur = Cur->getParent(); 3323 if (!Cur->Encloses(DC)) { 3324 // The qualifying scope doesn't enclose the original declaration. 3325 // Emit diagnostic based on current scope. 3326 SourceLocation L = D.getIdentifierLoc(); 3327 SourceRange R = D.getCXXScopeSpec().getRange(); 3328 if (isa<FunctionDecl>(Cur)) 3329 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3330 else 3331 Diag(L, diag::err_invalid_declarator_scope) 3332 << Name << cast<NamedDecl>(DC) << R; 3333 D.setInvalidType(); 3334 } 3335 } 3336 } 3337 3338 if (Previous.isSingleResult() && 3339 Previous.getFoundDecl()->isTemplateParameter()) { 3340 // Maybe we will complain about the shadowed template parameter. 3341 if (!D.isInvalidType()) 3342 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3343 Previous.getFoundDecl())) 3344 D.setInvalidType(); 3345 3346 // Just pretend that we didn't see the previous declaration. 3347 Previous.clear(); 3348 } 3349 3350 // In C++, the previous declaration we find might be a tag type 3351 // (class or enum). In this case, the new declaration will hide the 3352 // tag type. Note that this does does not apply if we're declaring a 3353 // typedef (C++ [dcl.typedef]p4). 3354 if (Previous.isSingleTagDecl() && 3355 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3356 Previous.clear(); 3357 3358 bool AddToScope = true; 3359 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3360 if (TemplateParamLists.size()) { 3361 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3362 return 0; 3363 } 3364 3365 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3366 } else if (R->isFunctionType()) { 3367 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3368 move(TemplateParamLists), 3369 AddToScope); 3370 } else { 3371 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3372 move(TemplateParamLists)); 3373 } 3374 3375 if (New == 0) 3376 return 0; 3377 3378 // If this has an identifier and is not an invalid redeclaration or 3379 // function template specialization, add it to the scope stack. 3380 if (New->getDeclName() && AddToScope && 3381 !(D.isRedeclaration() && New->isInvalidDecl())) 3382 PushOnScopeChains(New, S); 3383 3384 return New; 3385} 3386 3387/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3388/// types into constant array types in certain situations which would otherwise 3389/// be errors (for GCC compatibility). 3390static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3391 ASTContext &Context, 3392 bool &SizeIsNegative, 3393 llvm::APSInt &Oversized) { 3394 // This method tries to turn a variable array into a constant 3395 // array even when the size isn't an ICE. This is necessary 3396 // for compatibility with code that depends on gcc's buggy 3397 // constant expression folding, like struct {char x[(int)(char*)2];} 3398 SizeIsNegative = false; 3399 Oversized = 0; 3400 3401 if (T->isDependentType()) 3402 return QualType(); 3403 3404 QualifierCollector Qs; 3405 const Type *Ty = Qs.strip(T); 3406 3407 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3408 QualType Pointee = PTy->getPointeeType(); 3409 QualType FixedType = 3410 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3411 Oversized); 3412 if (FixedType.isNull()) return FixedType; 3413 FixedType = Context.getPointerType(FixedType); 3414 return Qs.apply(Context, FixedType); 3415 } 3416 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3417 QualType Inner = PTy->getInnerType(); 3418 QualType FixedType = 3419 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3420 Oversized); 3421 if (FixedType.isNull()) return FixedType; 3422 FixedType = Context.getParenType(FixedType); 3423 return Qs.apply(Context, FixedType); 3424 } 3425 3426 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3427 if (!VLATy) 3428 return QualType(); 3429 // FIXME: We should probably handle this case 3430 if (VLATy->getElementType()->isVariablyModifiedType()) 3431 return QualType(); 3432 3433 Expr::EvalResult EvalResult; 3434 if (!VLATy->getSizeExpr() || 3435 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3436 !EvalResult.Val.isInt()) 3437 return QualType(); 3438 3439 // Check whether the array size is negative. 3440 llvm::APSInt &Res = EvalResult.Val.getInt(); 3441 if (Res.isSigned() && Res.isNegative()) { 3442 SizeIsNegative = true; 3443 return QualType(); 3444 } 3445 3446 // Check whether the array is too large to be addressed. 3447 unsigned ActiveSizeBits 3448 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3449 Res); 3450 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3451 Oversized = Res; 3452 return QualType(); 3453 } 3454 3455 return Context.getConstantArrayType(VLATy->getElementType(), 3456 Res, ArrayType::Normal, 0); 3457} 3458 3459/// \brief Register the given locally-scoped external C declaration so 3460/// that it can be found later for redeclarations 3461void 3462Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3463 const LookupResult &Previous, 3464 Scope *S) { 3465 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3466 "Decl is not a locally-scoped decl!"); 3467 // Note that we have a locally-scoped external with this name. 3468 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3469 3470 if (!Previous.isSingleResult()) 3471 return; 3472 3473 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3474 3475 // If there was a previous declaration of this variable, it may be 3476 // in our identifier chain. Update the identifier chain with the new 3477 // declaration. 3478 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3479 // The previous declaration was found on the identifer resolver 3480 // chain, so remove it from its scope. 3481 3482 if (S->isDeclScope(PrevDecl)) { 3483 // Special case for redeclarations in the SAME scope. 3484 // Because this declaration is going to be added to the identifier chain 3485 // later, we should temporarily take it OFF the chain. 3486 IdResolver.RemoveDecl(ND); 3487 3488 } else { 3489 // Find the scope for the original declaration. 3490 while (S && !S->isDeclScope(PrevDecl)) 3491 S = S->getParent(); 3492 } 3493 3494 if (S) 3495 S->RemoveDecl(PrevDecl); 3496 } 3497} 3498 3499llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3500Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3501 if (ExternalSource) { 3502 // Load locally-scoped external decls from the external source. 3503 SmallVector<NamedDecl *, 4> Decls; 3504 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3505 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3506 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3507 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3508 if (Pos == LocallyScopedExternalDecls.end()) 3509 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3510 } 3511 } 3512 3513 return LocallyScopedExternalDecls.find(Name); 3514} 3515 3516/// \brief Diagnose function specifiers on a declaration of an identifier that 3517/// does not identify a function. 3518void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3519 // FIXME: We should probably indicate the identifier in question to avoid 3520 // confusion for constructs like "inline int a(), b;" 3521 if (D.getDeclSpec().isInlineSpecified()) 3522 Diag(D.getDeclSpec().getInlineSpecLoc(), 3523 diag::err_inline_non_function); 3524 3525 if (D.getDeclSpec().isVirtualSpecified()) 3526 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3527 diag::err_virtual_non_function); 3528 3529 if (D.getDeclSpec().isExplicitSpecified()) 3530 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3531 diag::err_explicit_non_function); 3532} 3533 3534NamedDecl* 3535Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3536 TypeSourceInfo *TInfo, LookupResult &Previous) { 3537 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3538 if (D.getCXXScopeSpec().isSet()) { 3539 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3540 << D.getCXXScopeSpec().getRange(); 3541 D.setInvalidType(); 3542 // Pretend we didn't see the scope specifier. 3543 DC = CurContext; 3544 Previous.clear(); 3545 } 3546 3547 if (getLangOptions().CPlusPlus) { 3548 // Check that there are no default arguments (C++ only). 3549 CheckExtraCXXDefaultArguments(D); 3550 } 3551 3552 DiagnoseFunctionSpecifiers(D); 3553 3554 if (D.getDeclSpec().isThreadSpecified()) 3555 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3556 if (D.getDeclSpec().isConstexprSpecified()) 3557 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3558 << 1; 3559 3560 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3561 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3562 << D.getName().getSourceRange(); 3563 return 0; 3564 } 3565 3566 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3567 if (!NewTD) return 0; 3568 3569 // Handle attributes prior to checking for duplicates in MergeVarDecl 3570 ProcessDeclAttributes(S, NewTD, D); 3571 3572 CheckTypedefForVariablyModifiedType(S, NewTD); 3573 3574 bool Redeclaration = D.isRedeclaration(); 3575 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3576 D.setRedeclaration(Redeclaration); 3577 return ND; 3578} 3579 3580void 3581Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3582 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3583 // then it shall have block scope. 3584 // Note that variably modified types must be fixed before merging the decl so 3585 // that redeclarations will match. 3586 QualType T = NewTD->getUnderlyingType(); 3587 if (T->isVariablyModifiedType()) { 3588 getCurFunction()->setHasBranchProtectedScope(); 3589 3590 if (S->getFnParent() == 0) { 3591 bool SizeIsNegative; 3592 llvm::APSInt Oversized; 3593 QualType FixedTy = 3594 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3595 Oversized); 3596 if (!FixedTy.isNull()) { 3597 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3598 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3599 } else { 3600 if (SizeIsNegative) 3601 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3602 else if (T->isVariableArrayType()) 3603 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3604 else if (Oversized.getBoolValue()) 3605 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3606 else 3607 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3608 NewTD->setInvalidDecl(); 3609 } 3610 } 3611 } 3612} 3613 3614 3615/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3616/// declares a typedef-name, either using the 'typedef' type specifier or via 3617/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3618NamedDecl* 3619Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3620 LookupResult &Previous, bool &Redeclaration) { 3621 // Merge the decl with the existing one if appropriate. If the decl is 3622 // in an outer scope, it isn't the same thing. 3623 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3624 /*ExplicitInstantiationOrSpecialization=*/false); 3625 if (!Previous.empty()) { 3626 Redeclaration = true; 3627 MergeTypedefNameDecl(NewTD, Previous); 3628 } 3629 3630 // If this is the C FILE type, notify the AST context. 3631 if (IdentifierInfo *II = NewTD->getIdentifier()) 3632 if (!NewTD->isInvalidDecl() && 3633 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3634 if (II->isStr("FILE")) 3635 Context.setFILEDecl(NewTD); 3636 else if (II->isStr("jmp_buf")) 3637 Context.setjmp_bufDecl(NewTD); 3638 else if (II->isStr("sigjmp_buf")) 3639 Context.setsigjmp_bufDecl(NewTD); 3640 else if (II->isStr("__builtin_va_list")) 3641 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3642 } 3643 3644 return NewTD; 3645} 3646 3647/// \brief Determines whether the given declaration is an out-of-scope 3648/// previous declaration. 3649/// 3650/// This routine should be invoked when name lookup has found a 3651/// previous declaration (PrevDecl) that is not in the scope where a 3652/// new declaration by the same name is being introduced. If the new 3653/// declaration occurs in a local scope, previous declarations with 3654/// linkage may still be considered previous declarations (C99 3655/// 6.2.2p4-5, C++ [basic.link]p6). 3656/// 3657/// \param PrevDecl the previous declaration found by name 3658/// lookup 3659/// 3660/// \param DC the context in which the new declaration is being 3661/// declared. 3662/// 3663/// \returns true if PrevDecl is an out-of-scope previous declaration 3664/// for a new delcaration with the same name. 3665static bool 3666isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3667 ASTContext &Context) { 3668 if (!PrevDecl) 3669 return false; 3670 3671 if (!PrevDecl->hasLinkage()) 3672 return false; 3673 3674 if (Context.getLangOptions().CPlusPlus) { 3675 // C++ [basic.link]p6: 3676 // If there is a visible declaration of an entity with linkage 3677 // having the same name and type, ignoring entities declared 3678 // outside the innermost enclosing namespace scope, the block 3679 // scope declaration declares that same entity and receives the 3680 // linkage of the previous declaration. 3681 DeclContext *OuterContext = DC->getRedeclContext(); 3682 if (!OuterContext->isFunctionOrMethod()) 3683 // This rule only applies to block-scope declarations. 3684 return false; 3685 3686 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3687 if (PrevOuterContext->isRecord()) 3688 // We found a member function: ignore it. 3689 return false; 3690 3691 // Find the innermost enclosing namespace for the new and 3692 // previous declarations. 3693 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3694 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3695 3696 // The previous declaration is in a different namespace, so it 3697 // isn't the same function. 3698 if (!OuterContext->Equals(PrevOuterContext)) 3699 return false; 3700 } 3701 3702 return true; 3703} 3704 3705static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3706 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3707 if (!SS.isSet()) return; 3708 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3709} 3710 3711bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3712 QualType type = decl->getType(); 3713 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3714 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3715 // Various kinds of declaration aren't allowed to be __autoreleasing. 3716 unsigned kind = -1U; 3717 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3718 if (var->hasAttr<BlocksAttr>()) 3719 kind = 0; // __block 3720 else if (!var->hasLocalStorage()) 3721 kind = 1; // global 3722 } else if (isa<ObjCIvarDecl>(decl)) { 3723 kind = 3; // ivar 3724 } else if (isa<FieldDecl>(decl)) { 3725 kind = 2; // field 3726 } 3727 3728 if (kind != -1U) { 3729 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3730 << kind; 3731 } 3732 } else if (lifetime == Qualifiers::OCL_None) { 3733 // Try to infer lifetime. 3734 if (!type->isObjCLifetimeType()) 3735 return false; 3736 3737 lifetime = type->getObjCARCImplicitLifetime(); 3738 type = Context.getLifetimeQualifiedType(type, lifetime); 3739 decl->setType(type); 3740 } 3741 3742 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3743 // Thread-local variables cannot have lifetime. 3744 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3745 var->isThreadSpecified()) { 3746 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3747 << var->getType(); 3748 return true; 3749 } 3750 } 3751 3752 return false; 3753} 3754 3755NamedDecl* 3756Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3757 TypeSourceInfo *TInfo, LookupResult &Previous, 3758 MultiTemplateParamsArg TemplateParamLists) { 3759 QualType R = TInfo->getType(); 3760 DeclarationName Name = GetNameForDeclarator(D).getName(); 3761 3762 // Check that there are no default arguments (C++ only). 3763 if (getLangOptions().CPlusPlus) 3764 CheckExtraCXXDefaultArguments(D); 3765 3766 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3767 assert(SCSpec != DeclSpec::SCS_typedef && 3768 "Parser allowed 'typedef' as storage class VarDecl."); 3769 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3770 if (SCSpec == DeclSpec::SCS_mutable) { 3771 // mutable can only appear on non-static class members, so it's always 3772 // an error here 3773 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3774 D.setInvalidType(); 3775 SC = SC_None; 3776 } 3777 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3778 VarDecl::StorageClass SCAsWritten 3779 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3780 3781 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3782 if (!II) { 3783 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3784 << Name; 3785 return 0; 3786 } 3787 3788 DiagnoseFunctionSpecifiers(D); 3789 3790 if (!DC->isRecord() && S->getFnParent() == 0) { 3791 // C99 6.9p2: The storage-class specifiers auto and register shall not 3792 // appear in the declaration specifiers in an external declaration. 3793 if (SC == SC_Auto || SC == SC_Register) { 3794 3795 // If this is a register variable with an asm label specified, then this 3796 // is a GNU extension. 3797 if (SC == SC_Register && D.getAsmLabel()) 3798 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3799 else 3800 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3801 D.setInvalidType(); 3802 } 3803 } 3804 3805 if (getLangOptions().OpenCL) { 3806 // Set up the special work-group-local storage class for variables in the 3807 // OpenCL __local address space. 3808 if (R.getAddressSpace() == LangAS::opencl_local) 3809 SC = SC_OpenCLWorkGroupLocal; 3810 } 3811 3812 bool isExplicitSpecialization = false; 3813 VarDecl *NewVD; 3814 if (!getLangOptions().CPlusPlus) { 3815 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3816 D.getIdentifierLoc(), II, 3817 R, TInfo, SC, SCAsWritten); 3818 3819 if (D.isInvalidType()) 3820 NewVD->setInvalidDecl(); 3821 } else { 3822 if (DC->isRecord() && !CurContext->isRecord()) { 3823 // This is an out-of-line definition of a static data member. 3824 if (SC == SC_Static) { 3825 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3826 diag::err_static_out_of_line) 3827 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3828 } else if (SC == SC_None) 3829 SC = SC_Static; 3830 } 3831 if (SC == SC_Static) { 3832 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3833 if (RD->isLocalClass()) 3834 Diag(D.getIdentifierLoc(), 3835 diag::err_static_data_member_not_allowed_in_local_class) 3836 << Name << RD->getDeclName(); 3837 3838 // C++ [class.union]p1: If a union contains a static data member, 3839 // the program is ill-formed. 3840 // 3841 // We also disallow static data members in anonymous structs. 3842 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3843 Diag(D.getIdentifierLoc(), 3844 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3845 << Name << RD->isUnion(); 3846 } 3847 } 3848 3849 // Match up the template parameter lists with the scope specifier, then 3850 // determine whether we have a template or a template specialization. 3851 isExplicitSpecialization = false; 3852 bool Invalid = false; 3853 if (TemplateParameterList *TemplateParams 3854 = MatchTemplateParametersToScopeSpecifier( 3855 D.getDeclSpec().getSourceRange().getBegin(), 3856 D.getIdentifierLoc(), 3857 D.getCXXScopeSpec(), 3858 TemplateParamLists.get(), 3859 TemplateParamLists.size(), 3860 /*never a friend*/ false, 3861 isExplicitSpecialization, 3862 Invalid)) { 3863 if (TemplateParams->size() > 0) { 3864 // There is no such thing as a variable template. 3865 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3866 << II 3867 << SourceRange(TemplateParams->getTemplateLoc(), 3868 TemplateParams->getRAngleLoc()); 3869 return 0; 3870 } else { 3871 // There is an extraneous 'template<>' for this variable. Complain 3872 // about it, but allow the declaration of the variable. 3873 Diag(TemplateParams->getTemplateLoc(), 3874 diag::err_template_variable_noparams) 3875 << II 3876 << SourceRange(TemplateParams->getTemplateLoc(), 3877 TemplateParams->getRAngleLoc()); 3878 } 3879 } 3880 3881 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3882 D.getIdentifierLoc(), II, 3883 R, TInfo, SC, SCAsWritten); 3884 3885 // If this decl has an auto type in need of deduction, make a note of the 3886 // Decl so we can diagnose uses of it in its own initializer. 3887 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3888 R->getContainedAutoType()) 3889 ParsingInitForAutoVars.insert(NewVD); 3890 3891 if (D.isInvalidType() || Invalid) 3892 NewVD->setInvalidDecl(); 3893 3894 SetNestedNameSpecifier(NewVD, D); 3895 3896 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3897 NewVD->setTemplateParameterListsInfo(Context, 3898 TemplateParamLists.size(), 3899 TemplateParamLists.release()); 3900 } 3901 3902 if (D.getDeclSpec().isConstexprSpecified()) { 3903 // FIXME: once we know whether there's an initializer, apply this to 3904 // static data members too. 3905 if (!NewVD->isStaticDataMember() && 3906 !NewVD->isThisDeclarationADefinition()) { 3907 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3908 // of a variable. Suggest replacing it with 'const' if appropriate. 3909 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3910 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3911 // If the declarator is complex, we need to move the keyword to the 3912 // innermost chunk as we switch it from 'constexpr' to 'const'. 3913 int Kind = DeclaratorChunk::Paren; 3914 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3915 Kind = D.getTypeObject(I).Kind; 3916 if (Kind != DeclaratorChunk::Paren) 3917 break; 3918 } 3919 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3920 Kind == DeclaratorChunk::Reference) 3921 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3922 << FixItHint::CreateRemoval(ConstexprRange); 3923 else if (Kind == DeclaratorChunk::Paren) 3924 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3925 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3926 else 3927 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3928 << FixItHint::CreateRemoval(ConstexprRange) 3929 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3930 } else { 3931 NewVD->setConstexpr(true); 3932 } 3933 } 3934 } 3935 3936 // Set the lexical context. If the declarator has a C++ scope specifier, the 3937 // lexical context will be different from the semantic context. 3938 NewVD->setLexicalDeclContext(CurContext); 3939 3940 if (D.getDeclSpec().isThreadSpecified()) { 3941 if (NewVD->hasLocalStorage()) 3942 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3943 else if (!Context.getTargetInfo().isTLSSupported()) 3944 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3945 else 3946 NewVD->setThreadSpecified(true); 3947 } 3948 3949 if (D.getDeclSpec().isModulePrivateSpecified()) { 3950 if (isExplicitSpecialization) 3951 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3952 << 2 3953 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3954 else if (NewVD->hasLocalStorage()) 3955 Diag(NewVD->getLocation(), diag::err_module_private_local) 3956 << 0 << NewVD->getDeclName() 3957 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3958 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3959 else 3960 NewVD->setModulePrivate(); 3961 } 3962 3963 // Handle attributes prior to checking for duplicates in MergeVarDecl 3964 ProcessDeclAttributes(S, NewVD, D); 3965 3966 // In auto-retain/release, infer strong retension for variables of 3967 // retainable type. 3968 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3969 NewVD->setInvalidDecl(); 3970 3971 // Handle GNU asm-label extension (encoded as an attribute). 3972 if (Expr *E = (Expr*)D.getAsmLabel()) { 3973 // The parser guarantees this is a string. 3974 StringLiteral *SE = cast<StringLiteral>(E); 3975 StringRef Label = SE->getString(); 3976 if (S->getFnParent() != 0) { 3977 switch (SC) { 3978 case SC_None: 3979 case SC_Auto: 3980 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3981 break; 3982 case SC_Register: 3983 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3984 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3985 break; 3986 case SC_Static: 3987 case SC_Extern: 3988 case SC_PrivateExtern: 3989 case SC_OpenCLWorkGroupLocal: 3990 break; 3991 } 3992 } 3993 3994 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3995 Context, Label)); 3996 } 3997 3998 // Diagnose shadowed variables before filtering for scope. 3999 if (!D.getCXXScopeSpec().isSet()) 4000 CheckShadow(S, NewVD, Previous); 4001 4002 // Don't consider existing declarations that are in a different 4003 // scope and are out-of-semantic-context declarations (if the new 4004 // declaration has linkage). 4005 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4006 isExplicitSpecialization); 4007 4008 if (!getLangOptions().CPlusPlus) { 4009 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4010 } else { 4011 // Merge the decl with the existing one if appropriate. 4012 if (!Previous.empty()) { 4013 if (Previous.isSingleResult() && 4014 isa<FieldDecl>(Previous.getFoundDecl()) && 4015 D.getCXXScopeSpec().isSet()) { 4016 // The user tried to define a non-static data member 4017 // out-of-line (C++ [dcl.meaning]p1). 4018 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4019 << D.getCXXScopeSpec().getRange(); 4020 Previous.clear(); 4021 NewVD->setInvalidDecl(); 4022 } 4023 } else if (D.getCXXScopeSpec().isSet()) { 4024 // No previous declaration in the qualifying scope. 4025 Diag(D.getIdentifierLoc(), diag::err_no_member) 4026 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4027 << D.getCXXScopeSpec().getRange(); 4028 NewVD->setInvalidDecl(); 4029 } 4030 4031 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4032 4033 // This is an explicit specialization of a static data member. Check it. 4034 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4035 CheckMemberSpecialization(NewVD, Previous)) 4036 NewVD->setInvalidDecl(); 4037 } 4038 4039 // attributes declared post-definition are currently ignored 4040 // FIXME: This should be handled in attribute merging, not 4041 // here. 4042 if (Previous.isSingleResult()) { 4043 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4044 if (Def && (Def = Def->getDefinition()) && 4045 Def != NewVD && D.hasAttributes()) { 4046 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4047 Diag(Def->getLocation(), diag::note_previous_definition); 4048 } 4049 } 4050 4051 // If this is a locally-scoped extern C variable, update the map of 4052 // such variables. 4053 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4054 !NewVD->isInvalidDecl()) 4055 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4056 4057 // If there's a #pragma GCC visibility in scope, and this isn't a class 4058 // member, set the visibility of this variable. 4059 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4060 AddPushedVisibilityAttribute(NewVD); 4061 4062 MarkUnusedFileScopedDecl(NewVD); 4063 4064 return NewVD; 4065} 4066 4067/// \brief Diagnose variable or built-in function shadowing. Implements 4068/// -Wshadow. 4069/// 4070/// This method is called whenever a VarDecl is added to a "useful" 4071/// scope. 4072/// 4073/// \param S the scope in which the shadowing name is being declared 4074/// \param R the lookup of the name 4075/// 4076void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4077 // Return if warning is ignored. 4078 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4079 DiagnosticsEngine::Ignored) 4080 return; 4081 4082 // Don't diagnose declarations at file scope. 4083 if (D->hasGlobalStorage()) 4084 return; 4085 4086 DeclContext *NewDC = D->getDeclContext(); 4087 4088 // Only diagnose if we're shadowing an unambiguous field or variable. 4089 if (R.getResultKind() != LookupResult::Found) 4090 return; 4091 4092 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4093 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4094 return; 4095 4096 // Fields are not shadowed by variables in C++ static methods. 4097 if (isa<FieldDecl>(ShadowedDecl)) 4098 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4099 if (MD->isStatic()) 4100 return; 4101 4102 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4103 if (shadowedVar->isExternC()) { 4104 // For shadowing external vars, make sure that we point to the global 4105 // declaration, not a locally scoped extern declaration. 4106 for (VarDecl::redecl_iterator 4107 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4108 I != E; ++I) 4109 if (I->isFileVarDecl()) { 4110 ShadowedDecl = *I; 4111 break; 4112 } 4113 } 4114 4115 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4116 4117 // Only warn about certain kinds of shadowing for class members. 4118 if (NewDC && NewDC->isRecord()) { 4119 // In particular, don't warn about shadowing non-class members. 4120 if (!OldDC->isRecord()) 4121 return; 4122 4123 // TODO: should we warn about static data members shadowing 4124 // static data members from base classes? 4125 4126 // TODO: don't diagnose for inaccessible shadowed members. 4127 // This is hard to do perfectly because we might friend the 4128 // shadowing context, but that's just a false negative. 4129 } 4130 4131 // Determine what kind of declaration we're shadowing. 4132 unsigned Kind; 4133 if (isa<RecordDecl>(OldDC)) { 4134 if (isa<FieldDecl>(ShadowedDecl)) 4135 Kind = 3; // field 4136 else 4137 Kind = 2; // static data member 4138 } else if (OldDC->isFileContext()) 4139 Kind = 1; // global 4140 else 4141 Kind = 0; // local 4142 4143 DeclarationName Name = R.getLookupName(); 4144 4145 // Emit warning and note. 4146 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4147 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4148} 4149 4150/// \brief Check -Wshadow without the advantage of a previous lookup. 4151void Sema::CheckShadow(Scope *S, VarDecl *D) { 4152 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4153 DiagnosticsEngine::Ignored) 4154 return; 4155 4156 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4157 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4158 LookupName(R, S); 4159 CheckShadow(S, D, R); 4160} 4161 4162/// \brief Perform semantic checking on a newly-created variable 4163/// declaration. 4164/// 4165/// This routine performs all of the type-checking required for a 4166/// variable declaration once it has been built. It is used both to 4167/// check variables after they have been parsed and their declarators 4168/// have been translated into a declaration, and to check variables 4169/// that have been instantiated from a template. 4170/// 4171/// Sets NewVD->isInvalidDecl() if an error was encountered. 4172/// 4173/// Returns true if the variable declaration is a redeclaration. 4174bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4175 LookupResult &Previous) { 4176 // If the decl is already known invalid, don't check it. 4177 if (NewVD->isInvalidDecl()) 4178 return false; 4179 4180 QualType T = NewVD->getType(); 4181 4182 if (T->isObjCObjectType()) { 4183 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4184 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4185 T = Context.getObjCObjectPointerType(T); 4186 NewVD->setType(T); 4187 } 4188 4189 // Emit an error if an address space was applied to decl with local storage. 4190 // This includes arrays of objects with address space qualifiers, but not 4191 // automatic variables that point to other address spaces. 4192 // ISO/IEC TR 18037 S5.1.2 4193 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4194 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4195 NewVD->setInvalidDecl(); 4196 return false; 4197 } 4198 4199 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4200 && !NewVD->hasAttr<BlocksAttr>()) { 4201 if (getLangOptions().getGC() != LangOptions::NonGC) 4202 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4203 else 4204 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4205 } 4206 4207 bool isVM = T->isVariablyModifiedType(); 4208 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4209 NewVD->hasAttr<BlocksAttr>()) 4210 getCurFunction()->setHasBranchProtectedScope(); 4211 4212 if ((isVM && NewVD->hasLinkage()) || 4213 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4214 bool SizeIsNegative; 4215 llvm::APSInt Oversized; 4216 QualType FixedTy = 4217 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4218 Oversized); 4219 4220 if (FixedTy.isNull() && T->isVariableArrayType()) { 4221 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4222 // FIXME: This won't give the correct result for 4223 // int a[10][n]; 4224 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4225 4226 if (NewVD->isFileVarDecl()) 4227 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4228 << SizeRange; 4229 else if (NewVD->getStorageClass() == SC_Static) 4230 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4231 << SizeRange; 4232 else 4233 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4234 << SizeRange; 4235 NewVD->setInvalidDecl(); 4236 return false; 4237 } 4238 4239 if (FixedTy.isNull()) { 4240 if (NewVD->isFileVarDecl()) 4241 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4242 else 4243 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4244 NewVD->setInvalidDecl(); 4245 return false; 4246 } 4247 4248 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4249 NewVD->setType(FixedTy); 4250 } 4251 4252 if (Previous.empty() && NewVD->isExternC()) { 4253 // Since we did not find anything by this name and we're declaring 4254 // an extern "C" variable, look for a non-visible extern "C" 4255 // declaration with the same name. 4256 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4257 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4258 if (Pos != LocallyScopedExternalDecls.end()) 4259 Previous.addDecl(Pos->second); 4260 } 4261 4262 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4263 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4264 << T; 4265 NewVD->setInvalidDecl(); 4266 return false; 4267 } 4268 4269 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4270 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4271 NewVD->setInvalidDecl(); 4272 return false; 4273 } 4274 4275 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4276 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4277 NewVD->setInvalidDecl(); 4278 return false; 4279 } 4280 4281 // Function pointers and references cannot have qualified function type, only 4282 // function pointer-to-members can do that. 4283 QualType Pointee; 4284 unsigned PtrOrRef = 0; 4285 if (const PointerType *Ptr = T->getAs<PointerType>()) 4286 Pointee = Ptr->getPointeeType(); 4287 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4288 Pointee = Ref->getPointeeType(); 4289 PtrOrRef = 1; 4290 } 4291 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4292 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4293 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4294 << PtrOrRef; 4295 NewVD->setInvalidDecl(); 4296 return false; 4297 } 4298 4299 if (!Previous.empty()) { 4300 MergeVarDecl(NewVD, Previous); 4301 return true; 4302 } 4303 return false; 4304} 4305 4306/// \brief Data used with FindOverriddenMethod 4307struct FindOverriddenMethodData { 4308 Sema *S; 4309 CXXMethodDecl *Method; 4310}; 4311 4312/// \brief Member lookup function that determines whether a given C++ 4313/// method overrides a method in a base class, to be used with 4314/// CXXRecordDecl::lookupInBases(). 4315static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4316 CXXBasePath &Path, 4317 void *UserData) { 4318 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4319 4320 FindOverriddenMethodData *Data 4321 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4322 4323 DeclarationName Name = Data->Method->getDeclName(); 4324 4325 // FIXME: Do we care about other names here too? 4326 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4327 // We really want to find the base class destructor here. 4328 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4329 CanQualType CT = Data->S->Context.getCanonicalType(T); 4330 4331 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4332 } 4333 4334 for (Path.Decls = BaseRecord->lookup(Name); 4335 Path.Decls.first != Path.Decls.second; 4336 ++Path.Decls.first) { 4337 NamedDecl *D = *Path.Decls.first; 4338 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4339 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4340 return true; 4341 } 4342 } 4343 4344 return false; 4345} 4346 4347/// AddOverriddenMethods - See if a method overrides any in the base classes, 4348/// and if so, check that it's a valid override and remember it. 4349bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4350 // Look for virtual methods in base classes that this method might override. 4351 CXXBasePaths Paths; 4352 FindOverriddenMethodData Data; 4353 Data.Method = MD; 4354 Data.S = this; 4355 bool AddedAny = false; 4356 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4357 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4358 E = Paths.found_decls_end(); I != E; ++I) { 4359 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4360 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4361 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4362 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4363 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4364 AddedAny = true; 4365 } 4366 } 4367 } 4368 } 4369 4370 return AddedAny; 4371} 4372 4373namespace { 4374 // Struct for holding all of the extra arguments needed by 4375 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4376 struct ActOnFDArgs { 4377 Scope *S; 4378 Declarator &D; 4379 MultiTemplateParamsArg TemplateParamLists; 4380 bool AddToScope; 4381 }; 4382} 4383 4384/// \brief Generate diagnostics for an invalid function redeclaration. 4385/// 4386/// This routine handles generating the diagnostic messages for an invalid 4387/// function redeclaration, including finding possible similar declarations 4388/// or performing typo correction if there are no previous declarations with 4389/// the same name. 4390/// 4391/// Returns a NamedDecl iff typo correction was performed and substituting in 4392/// the new declaration name does not cause new errors. 4393static NamedDecl* DiagnoseInvalidRedeclaration( 4394 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4395 ActOnFDArgs &ExtraArgs) { 4396 NamedDecl *Result = NULL; 4397 DeclarationName Name = NewFD->getDeclName(); 4398 DeclContext *NewDC = NewFD->getDeclContext(); 4399 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4400 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4401 llvm::SmallVector<unsigned, 1> MismatchedParams; 4402 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4403 TypoCorrection Correction; 4404 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4405 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4406 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4407 : diag::err_member_def_does_not_match; 4408 4409 NewFD->setInvalidDecl(); 4410 SemaRef.LookupQualifiedName(Prev, NewDC); 4411 assert(!Prev.isAmbiguous() && 4412 "Cannot have an ambiguity in previous-declaration lookup"); 4413 if (!Prev.empty()) { 4414 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4415 Func != FuncEnd; ++Func) { 4416 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4417 if (FD && 4418 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4419 // Add 1 to the index so that 0 can mean the mismatch didn't 4420 // involve a parameter 4421 unsigned ParamNum = 4422 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4423 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4424 } 4425 } 4426 // If the qualified name lookup yielded nothing, try typo correction 4427 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4428 Prev.getLookupKind(), 0, 0, NewDC)) && 4429 Correction.getCorrection() != Name) { 4430 // Trap errors. 4431 Sema::SFINAETrap Trap(SemaRef); 4432 4433 // Set up everything for the call to ActOnFunctionDeclarator 4434 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4435 ExtraArgs.D.getIdentifierLoc()); 4436 Previous.clear(); 4437 Previous.setLookupName(Correction.getCorrection()); 4438 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4439 CDeclEnd = Correction.end(); 4440 CDecl != CDeclEnd; ++CDecl) { 4441 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4442 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4443 MismatchedParams)) { 4444 Previous.addDecl(FD); 4445 } 4446 } 4447 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4448 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4449 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4450 // eliminate the need for the parameter pack ExtraArgs. 4451 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4452 NewFD->getDeclContext(), 4453 NewFD->getTypeSourceInfo(), 4454 Previous, 4455 ExtraArgs.TemplateParamLists, 4456 ExtraArgs.AddToScope); 4457 if (Trap.hasErrorOccurred()) { 4458 // Pretend the typo correction never occurred 4459 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4460 ExtraArgs.D.getIdentifierLoc()); 4461 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4462 Previous.clear(); 4463 Previous.setLookupName(Name); 4464 Result = NULL; 4465 } else { 4466 for (LookupResult::iterator Func = Previous.begin(), 4467 FuncEnd = Previous.end(); 4468 Func != FuncEnd; ++Func) { 4469 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4470 NearMatches.push_back(std::make_pair(FD, 0)); 4471 } 4472 } 4473 if (NearMatches.empty()) { 4474 // Ignore the correction if it didn't yield any close FunctionDecl matches 4475 Correction = TypoCorrection(); 4476 } else { 4477 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4478 : diag::err_member_def_does_not_match_suggest; 4479 } 4480 } 4481 4482 if (Correction) 4483 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4484 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4485 << FixItHint::CreateReplacement( 4486 NewFD->getLocation(), 4487 Correction.getAsString(SemaRef.getLangOptions())); 4488 else 4489 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4490 << Name << NewDC << NewFD->getLocation(); 4491 4492 bool NewFDisConst = false; 4493 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4494 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4495 4496 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4497 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4498 NearMatch != NearMatchEnd; ++NearMatch) { 4499 FunctionDecl *FD = NearMatch->first; 4500 bool FDisConst = false; 4501 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4502 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4503 4504 if (unsigned Idx = NearMatch->second) { 4505 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4506 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4507 diag::note_member_def_close_param_match) 4508 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4509 } else if (Correction) { 4510 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4511 << Correction.getQuoted(SemaRef.getLangOptions()); 4512 } else if (FDisConst != NewFDisConst) { 4513 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4514 << NewFDisConst << FD->getSourceRange().getEnd(); 4515 } else 4516 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4517 } 4518 return Result; 4519} 4520 4521static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) { 4522 switch (D.getDeclSpec().getStorageClassSpec()) { 4523 default: llvm_unreachable("Unknown storage class!"); 4524 case DeclSpec::SCS_auto: 4525 case DeclSpec::SCS_register: 4526 case DeclSpec::SCS_mutable: 4527 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4528 diag::err_typecheck_sclass_func); 4529 D.setInvalidType(); 4530 break; 4531 case DeclSpec::SCS_unspecified: break; 4532 case DeclSpec::SCS_extern: return SC_Extern; 4533 case DeclSpec::SCS_static: { 4534 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4535 // C99 6.7.1p5: 4536 // The declaration of an identifier for a function that has 4537 // block scope shall have no explicit storage-class specifier 4538 // other than extern 4539 // See also (C++ [dcl.stc]p4). 4540 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4541 diag::err_static_block_func); 4542 break; 4543 } else 4544 return SC_Static; 4545 } 4546 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4547 } 4548 4549 // No explicit storage class has already been returned 4550 return SC_None; 4551} 4552 4553static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4554 DeclContext *DC, QualType &R, 4555 TypeSourceInfo *TInfo, 4556 FunctionDecl::StorageClass SC, 4557 bool &IsVirtualOkay) { 4558 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4559 DeclarationName Name = NameInfo.getName(); 4560 4561 FunctionDecl *NewFD = 0; 4562 bool isInline = D.getDeclSpec().isInlineSpecified(); 4563 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4564 FunctionDecl::StorageClass SCAsWritten 4565 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4566 4567 if (!SemaRef.getLangOptions().CPlusPlus) { 4568 // Determine whether the function was written with a 4569 // prototype. This true when: 4570 // - there is a prototype in the declarator, or 4571 // - the type R of the function is some kind of typedef or other reference 4572 // to a type name (which eventually refers to a function type). 4573 bool HasPrototype = 4574 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4575 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4576 4577 NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getSourceRange().getBegin(), 4578 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4579 HasPrototype); 4580 if (D.isInvalidType()) 4581 NewFD->setInvalidDecl(); 4582 4583 // Set the lexical context. 4584 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4585 4586 return NewFD; 4587 } 4588 4589 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4590 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4591 4592 // Check that the return type is not an abstract class type. 4593 // For record types, this is done by the AbstractClassUsageDiagnoser once 4594 // the class has been completely parsed. 4595 if (!DC->isRecord() && 4596 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4597 R->getAs<FunctionType>()->getResultType(), 4598 diag::err_abstract_type_in_decl, 4599 SemaRef.AbstractReturnType)) 4600 D.setInvalidType(); 4601 4602 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4603 // This is a C++ constructor declaration. 4604 assert(DC->isRecord() && 4605 "Constructors can only be declared in a member context"); 4606 4607 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4608 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4609 D.getSourceRange().getBegin(), NameInfo, 4610 R, TInfo, isExplicit, isInline, 4611 /*isImplicitlyDeclared=*/false, 4612 isConstexpr); 4613 4614 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4615 // This is a C++ destructor declaration. 4616 if (DC->isRecord()) { 4617 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4618 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4619 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4620 SemaRef.Context, Record, 4621 D.getSourceRange().getBegin(), 4622 NameInfo, R, TInfo, isInline, 4623 /*isImplicitlyDeclared=*/false); 4624 4625 // If the class is complete, then we now create the implicit exception 4626 // specification. If the class is incomplete or dependent, we can't do 4627 // it yet. 4628 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4629 Record->getDefinition() && !Record->isBeingDefined() && 4630 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4631 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4632 } 4633 4634 IsVirtualOkay = true; 4635 return NewDD; 4636 4637 } else { 4638 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4639 D.setInvalidType(); 4640 4641 // Create a FunctionDecl to satisfy the function definition parsing 4642 // code path. 4643 return FunctionDecl::Create(SemaRef.Context, DC, 4644 D.getSourceRange().getBegin(), 4645 D.getIdentifierLoc(), Name, R, TInfo, 4646 SC, SCAsWritten, isInline, 4647 /*hasPrototype=*/true, isConstexpr); 4648 } 4649 4650 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4651 if (!DC->isRecord()) { 4652 SemaRef.Diag(D.getIdentifierLoc(), 4653 diag::err_conv_function_not_member); 4654 return 0; 4655 } 4656 4657 SemaRef.CheckConversionDeclarator(D, R, SC); 4658 IsVirtualOkay = true; 4659 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4660 D.getSourceRange().getBegin(), NameInfo, 4661 R, TInfo, isInline, isExplicit, 4662 isConstexpr, SourceLocation()); 4663 4664 } else if (DC->isRecord()) { 4665 // If the name of the function is the same as the name of the record, 4666 // then this must be an invalid constructor that has a return type. 4667 // (The parser checks for a return type and makes the declarator a 4668 // constructor if it has no return type). 4669 if (Name.getAsIdentifierInfo() && 4670 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4671 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4672 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4673 << SourceRange(D.getIdentifierLoc()); 4674 return 0; 4675 } 4676 4677 bool isStatic = SC == SC_Static; 4678 4679 // [class.free]p1: 4680 // Any allocation function for a class T is a static member 4681 // (even if not explicitly declared static). 4682 if (Name.getCXXOverloadedOperator() == OO_New || 4683 Name.getCXXOverloadedOperator() == OO_Array_New) 4684 isStatic = true; 4685 4686 // [class.free]p6 Any deallocation function for a class X is a static member 4687 // (even if not explicitly declared static). 4688 if (Name.getCXXOverloadedOperator() == OO_Delete || 4689 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4690 isStatic = true; 4691 4692 IsVirtualOkay = !isStatic; 4693 4694 // This is a C++ method declaration. 4695 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4696 D.getSourceRange().getBegin(), NameInfo, R, 4697 TInfo, isStatic, SCAsWritten, isInline, 4698 isConstexpr, SourceLocation()); 4699 4700 } else { 4701 // Determine whether the function was written with a 4702 // prototype. This true when: 4703 // - we're in C++ (where every function has a prototype), 4704 return FunctionDecl::Create(SemaRef.Context, DC, 4705 D.getSourceRange().getBegin(), 4706 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4707 true/*HasPrototype*/, isConstexpr); 4708 } 4709} 4710 4711NamedDecl* 4712Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4713 TypeSourceInfo *TInfo, LookupResult &Previous, 4714 MultiTemplateParamsArg TemplateParamLists, 4715 bool &AddToScope) { 4716 QualType R = TInfo->getType(); 4717 4718 assert(R.getTypePtr()->isFunctionType()); 4719 4720 // TODO: consider using NameInfo for diagnostic. 4721 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4722 DeclarationName Name = NameInfo.getName(); 4723 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4724 4725 if (D.getDeclSpec().isThreadSpecified()) 4726 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4727 4728 // Do not allow returning a objc interface by-value. 4729 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4730 Diag(D.getIdentifierLoc(), 4731 diag::err_object_cannot_be_passed_returned_by_value) << 0 4732 << R->getAs<FunctionType>()->getResultType() 4733 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4734 4735 QualType T = R->getAs<FunctionType>()->getResultType(); 4736 T = Context.getObjCObjectPointerType(T); 4737 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4738 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4739 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4740 FPT->getNumArgs(), EPI); 4741 } 4742 else if (isa<FunctionNoProtoType>(R)) 4743 R = Context.getFunctionNoProtoType(T); 4744 } 4745 4746 bool isFriend = false; 4747 FunctionTemplateDecl *FunctionTemplate = 0; 4748 bool isExplicitSpecialization = false; 4749 bool isFunctionTemplateSpecialization = false; 4750 bool isDependentClassScopeExplicitSpecialization = false; 4751 bool isVirtualOkay = false; 4752 4753 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4754 isVirtualOkay); 4755 if (!NewFD) return 0; 4756 4757 if (getLangOptions().CPlusPlus) { 4758 bool isInline = D.getDeclSpec().isInlineSpecified(); 4759 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4760 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4761 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4762 isFriend = D.getDeclSpec().isFriendSpecified(); 4763 if (isFriend && !isInline && D.isFunctionDefinition()) { 4764 // C++ [class.friend]p5 4765 // A function can be defined in a friend declaration of a 4766 // class . . . . Such a function is implicitly inline. 4767 NewFD->setImplicitlyInline(); 4768 } 4769 4770 SetNestedNameSpecifier(NewFD, D); 4771 isExplicitSpecialization = false; 4772 isFunctionTemplateSpecialization = false; 4773 if (D.isInvalidType()) 4774 NewFD->setInvalidDecl(); 4775 4776 // Set the lexical context. If the declarator has a C++ 4777 // scope specifier, or is the object of a friend declaration, the 4778 // lexical context will be different from the semantic context. 4779 NewFD->setLexicalDeclContext(CurContext); 4780 4781 // Match up the template parameter lists with the scope specifier, then 4782 // determine whether we have a template or a template specialization. 4783 bool Invalid = false; 4784 if (TemplateParameterList *TemplateParams 4785 = MatchTemplateParametersToScopeSpecifier( 4786 D.getDeclSpec().getSourceRange().getBegin(), 4787 D.getIdentifierLoc(), 4788 D.getCXXScopeSpec(), 4789 TemplateParamLists.get(), 4790 TemplateParamLists.size(), 4791 isFriend, 4792 isExplicitSpecialization, 4793 Invalid)) { 4794 if (TemplateParams->size() > 0) { 4795 // This is a function template 4796 4797 // Check that we can declare a template here. 4798 if (CheckTemplateDeclScope(S, TemplateParams)) 4799 return 0; 4800 4801 // A destructor cannot be a template. 4802 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4803 Diag(NewFD->getLocation(), diag::err_destructor_template); 4804 return 0; 4805 } 4806 4807 // If we're adding a template to a dependent context, we may need to 4808 // rebuilding some of the types used within the template parameter list, 4809 // now that we know what the current instantiation is. 4810 if (DC->isDependentContext()) { 4811 ContextRAII SavedContext(*this, DC); 4812 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4813 Invalid = true; 4814 } 4815 4816 4817 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4818 NewFD->getLocation(), 4819 Name, TemplateParams, 4820 NewFD); 4821 FunctionTemplate->setLexicalDeclContext(CurContext); 4822 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4823 4824 // For source fidelity, store the other template param lists. 4825 if (TemplateParamLists.size() > 1) { 4826 NewFD->setTemplateParameterListsInfo(Context, 4827 TemplateParamLists.size() - 1, 4828 TemplateParamLists.release()); 4829 } 4830 } else { 4831 // This is a function template specialization. 4832 isFunctionTemplateSpecialization = true; 4833 // For source fidelity, store all the template param lists. 4834 NewFD->setTemplateParameterListsInfo(Context, 4835 TemplateParamLists.size(), 4836 TemplateParamLists.release()); 4837 4838 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4839 if (isFriend) { 4840 // We want to remove the "template<>", found here. 4841 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4842 4843 // If we remove the template<> and the name is not a 4844 // template-id, we're actually silently creating a problem: 4845 // the friend declaration will refer to an untemplated decl, 4846 // and clearly the user wants a template specialization. So 4847 // we need to insert '<>' after the name. 4848 SourceLocation InsertLoc; 4849 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4850 InsertLoc = D.getName().getSourceRange().getEnd(); 4851 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4852 } 4853 4854 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4855 << Name << RemoveRange 4856 << FixItHint::CreateRemoval(RemoveRange) 4857 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4858 } 4859 } 4860 } 4861 else { 4862 // All template param lists were matched against the scope specifier: 4863 // this is NOT (an explicit specialization of) a template. 4864 if (TemplateParamLists.size() > 0) 4865 // For source fidelity, store all the template param lists. 4866 NewFD->setTemplateParameterListsInfo(Context, 4867 TemplateParamLists.size(), 4868 TemplateParamLists.release()); 4869 } 4870 4871 if (Invalid) { 4872 NewFD->setInvalidDecl(); 4873 if (FunctionTemplate) 4874 FunctionTemplate->setInvalidDecl(); 4875 } 4876 4877 // C++ [dcl.fct.spec]p5: 4878 // The virtual specifier shall only be used in declarations of 4879 // nonstatic class member functions that appear within a 4880 // member-specification of a class declaration; see 10.3. 4881 // 4882 if (isVirtual && !NewFD->isInvalidDecl()) { 4883 if (!isVirtualOkay) { 4884 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4885 diag::err_virtual_non_function); 4886 } else if (!CurContext->isRecord()) { 4887 // 'virtual' was specified outside of the class. 4888 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4889 diag::err_virtual_out_of_class) 4890 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4891 } else if (NewFD->getDescribedFunctionTemplate()) { 4892 // C++ [temp.mem]p3: 4893 // A member function template shall not be virtual. 4894 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4895 diag::err_virtual_member_function_template) 4896 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4897 } else { 4898 // Okay: Add virtual to the method. 4899 NewFD->setVirtualAsWritten(true); 4900 } 4901 } 4902 4903 // C++ [dcl.fct.spec]p3: 4904 // The inline specifier shall not appear on a block scope function declaration. 4905 if (isInline && !NewFD->isInvalidDecl()) { 4906 if (CurContext->isFunctionOrMethod()) { 4907 // 'inline' is not allowed on block scope function declaration. 4908 Diag(D.getDeclSpec().getInlineSpecLoc(), 4909 diag::err_inline_declaration_block_scope) << Name 4910 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4911 } 4912 } 4913 4914 // C++ [dcl.fct.spec]p6: 4915 // The explicit specifier shall be used only in the declaration of a 4916 // constructor or conversion function within its class definition; see 12.3.1 4917 // and 12.3.2. 4918 if (isExplicit && !NewFD->isInvalidDecl()) { 4919 if (!CurContext->isRecord()) { 4920 // 'explicit' was specified outside of the class. 4921 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4922 diag::err_explicit_out_of_class) 4923 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4924 } else if (!isa<CXXConstructorDecl>(NewFD) && 4925 !isa<CXXConversionDecl>(NewFD)) { 4926 // 'explicit' was specified on a function that wasn't a constructor 4927 // or conversion function. 4928 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4929 diag::err_explicit_non_ctor_or_conv_function) 4930 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4931 } 4932 } 4933 4934 if (isConstexpr) { 4935 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4936 // are implicitly inline. 4937 NewFD->setImplicitlyInline(); 4938 4939 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4940 // be either constructors or to return a literal type. Therefore, 4941 // destructors cannot be declared constexpr. 4942 if (isa<CXXDestructorDecl>(NewFD)) 4943 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4944 } 4945 4946 // If __module_private__ was specified, mark the function accordingly. 4947 if (D.getDeclSpec().isModulePrivateSpecified()) { 4948 if (isFunctionTemplateSpecialization) { 4949 SourceLocation ModulePrivateLoc 4950 = D.getDeclSpec().getModulePrivateSpecLoc(); 4951 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4952 << 0 4953 << FixItHint::CreateRemoval(ModulePrivateLoc); 4954 } else { 4955 NewFD->setModulePrivate(); 4956 if (FunctionTemplate) 4957 FunctionTemplate->setModulePrivate(); 4958 } 4959 } 4960 4961 if (isFriend) { 4962 // For now, claim that the objects have no previous declaration. 4963 if (FunctionTemplate) { 4964 FunctionTemplate->setObjectOfFriendDecl(false); 4965 FunctionTemplate->setAccess(AS_public); 4966 } 4967 NewFD->setObjectOfFriendDecl(false); 4968 NewFD->setAccess(AS_public); 4969 } 4970 4971 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4972 D.isFunctionDefinition()) { 4973 // A method is implicitly inline if it's defined in its class 4974 // definition. 4975 NewFD->setImplicitlyInline(); 4976 } 4977 4978 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4979 !CurContext->isRecord()) { 4980 // C++ [class.static]p1: 4981 // A data or function member of a class may be declared static 4982 // in a class definition, in which case it is a static member of 4983 // the class. 4984 4985 // Complain about the 'static' specifier if it's on an out-of-line 4986 // member function definition. 4987 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4988 diag::err_static_out_of_line) 4989 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4990 } 4991 } 4992 4993 // Filter out previous declarations that don't match the scope. 4994 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4995 isExplicitSpecialization || 4996 isFunctionTemplateSpecialization); 4997 4998 // Handle GNU asm-label extension (encoded as an attribute). 4999 if (Expr *E = (Expr*) D.getAsmLabel()) { 5000 // The parser guarantees this is a string. 5001 StringLiteral *SE = cast<StringLiteral>(E); 5002 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5003 SE->getString())); 5004 } 5005 5006 // Copy the parameter declarations from the declarator D to the function 5007 // declaration NewFD, if they are available. First scavenge them into Params. 5008 SmallVector<ParmVarDecl*, 16> Params; 5009 if (D.isFunctionDeclarator()) { 5010 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5011 5012 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5013 // function that takes no arguments, not a function that takes a 5014 // single void argument. 5015 // We let through "const void" here because Sema::GetTypeForDeclarator 5016 // already checks for that case. 5017 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5018 FTI.ArgInfo[0].Param && 5019 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5020 // Empty arg list, don't push any params. 5021 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5022 5023 // In C++, the empty parameter-type-list must be spelled "void"; a 5024 // typedef of void is not permitted. 5025 if (getLangOptions().CPlusPlus && 5026 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5027 bool IsTypeAlias = false; 5028 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5029 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5030 else if (const TemplateSpecializationType *TST = 5031 Param->getType()->getAs<TemplateSpecializationType>()) 5032 IsTypeAlias = TST->isTypeAlias(); 5033 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5034 << IsTypeAlias; 5035 } 5036 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5037 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5038 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5039 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5040 Param->setDeclContext(NewFD); 5041 Params.push_back(Param); 5042 5043 if (Param->isInvalidDecl()) 5044 NewFD->setInvalidDecl(); 5045 } 5046 } 5047 5048 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5049 // When we're declaring a function with a typedef, typeof, etc as in the 5050 // following example, we'll need to synthesize (unnamed) 5051 // parameters for use in the declaration. 5052 // 5053 // @code 5054 // typedef void fn(int); 5055 // fn f; 5056 // @endcode 5057 5058 // Synthesize a parameter for each argument type. 5059 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5060 AE = FT->arg_type_end(); AI != AE; ++AI) { 5061 ParmVarDecl *Param = 5062 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5063 Param->setScopeInfo(0, Params.size()); 5064 Params.push_back(Param); 5065 } 5066 } else { 5067 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5068 "Should not need args for typedef of non-prototype fn"); 5069 } 5070 5071 // Finally, we know we have the right number of parameters, install them. 5072 NewFD->setParams(Params); 5073 5074 // Process the non-inheritable attributes on this declaration. 5075 ProcessDeclAttributes(S, NewFD, D, 5076 /*NonInheritable=*/true, /*Inheritable=*/false); 5077 5078 if (!getLangOptions().CPlusPlus) { 5079 // Perform semantic checking on the function declaration. 5080 bool isExplicitSpecialization=false; 5081 if (!NewFD->isInvalidDecl()) { 5082 if (NewFD->getResultType()->isVariablyModifiedType()) { 5083 // Functions returning a variably modified type violate C99 6.7.5.2p2 5084 // because all functions have linkage. 5085 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5086 NewFD->setInvalidDecl(); 5087 } else { 5088 if (NewFD->isMain()) 5089 CheckMain(NewFD, D.getDeclSpec()); 5090 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5091 isExplicitSpecialization)); 5092 } 5093 } 5094 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5095 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5096 "previous declaration set still overloaded"); 5097 } else { 5098 // If the declarator is a template-id, translate the parser's template 5099 // argument list into our AST format. 5100 bool HasExplicitTemplateArgs = false; 5101 TemplateArgumentListInfo TemplateArgs; 5102 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5103 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5104 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5105 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5106 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5107 TemplateId->getTemplateArgs(), 5108 TemplateId->NumArgs); 5109 translateTemplateArguments(TemplateArgsPtr, 5110 TemplateArgs); 5111 TemplateArgsPtr.release(); 5112 5113 HasExplicitTemplateArgs = true; 5114 5115 if (NewFD->isInvalidDecl()) { 5116 HasExplicitTemplateArgs = false; 5117 } else if (FunctionTemplate) { 5118 // Function template with explicit template arguments. 5119 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5120 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5121 5122 HasExplicitTemplateArgs = false; 5123 } else if (!isFunctionTemplateSpecialization && 5124 !D.getDeclSpec().isFriendSpecified()) { 5125 // We have encountered something that the user meant to be a 5126 // specialization (because it has explicitly-specified template 5127 // arguments) but that was not introduced with a "template<>" (or had 5128 // too few of them). 5129 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5130 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5131 << FixItHint::CreateInsertion( 5132 D.getDeclSpec().getSourceRange().getBegin(), 5133 "template<> "); 5134 isFunctionTemplateSpecialization = true; 5135 } else { 5136 // "friend void foo<>(int);" is an implicit specialization decl. 5137 isFunctionTemplateSpecialization = true; 5138 } 5139 } else if (isFriend && isFunctionTemplateSpecialization) { 5140 // This combination is only possible in a recovery case; the user 5141 // wrote something like: 5142 // template <> friend void foo(int); 5143 // which we're recovering from as if the user had written: 5144 // friend void foo<>(int); 5145 // Go ahead and fake up a template id. 5146 HasExplicitTemplateArgs = true; 5147 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5148 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5149 } 5150 5151 // If it's a friend (and only if it's a friend), it's possible 5152 // that either the specialized function type or the specialized 5153 // template is dependent, and therefore matching will fail. In 5154 // this case, don't check the specialization yet. 5155 bool InstantiationDependent = false; 5156 if (isFunctionTemplateSpecialization && isFriend && 5157 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5158 TemplateSpecializationType::anyDependentTemplateArguments( 5159 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5160 InstantiationDependent))) { 5161 assert(HasExplicitTemplateArgs && 5162 "friend function specialization without template args"); 5163 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5164 Previous)) 5165 NewFD->setInvalidDecl(); 5166 } else if (isFunctionTemplateSpecialization) { 5167 if (CurContext->isDependentContext() && CurContext->isRecord() 5168 && !isFriend) { 5169 isDependentClassScopeExplicitSpecialization = true; 5170 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5171 diag::ext_function_specialization_in_class : 5172 diag::err_function_specialization_in_class) 5173 << NewFD->getDeclName(); 5174 } else if (CheckFunctionTemplateSpecialization(NewFD, 5175 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5176 Previous)) 5177 NewFD->setInvalidDecl(); 5178 5179 // C++ [dcl.stc]p1: 5180 // A storage-class-specifier shall not be specified in an explicit 5181 // specialization (14.7.3) 5182 if (SC != SC_None) { 5183 if (SC != NewFD->getStorageClass()) 5184 Diag(NewFD->getLocation(), 5185 diag::err_explicit_specialization_inconsistent_storage_class) 5186 << SC 5187 << FixItHint::CreateRemoval( 5188 D.getDeclSpec().getStorageClassSpecLoc()); 5189 5190 else 5191 Diag(NewFD->getLocation(), 5192 diag::ext_explicit_specialization_storage_class) 5193 << FixItHint::CreateRemoval( 5194 D.getDeclSpec().getStorageClassSpecLoc()); 5195 } 5196 5197 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5198 if (CheckMemberSpecialization(NewFD, Previous)) 5199 NewFD->setInvalidDecl(); 5200 } 5201 5202 // Perform semantic checking on the function declaration. 5203 if (!isDependentClassScopeExplicitSpecialization) { 5204 if (NewFD->isInvalidDecl()) { 5205 // If this is a class member, mark the class invalid immediately. 5206 // This avoids some consistency errors later. 5207 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5208 methodDecl->getParent()->setInvalidDecl(); 5209 } else { 5210 if (NewFD->isMain()) 5211 CheckMain(NewFD, D.getDeclSpec()); 5212 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5213 isExplicitSpecialization)); 5214 } 5215 } 5216 5217 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5218 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5219 "previous declaration set still overloaded"); 5220 5221 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5222 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5223 NewFD->setInvalidDecl(); 5224 5225 NamedDecl *PrincipalDecl = (FunctionTemplate 5226 ? cast<NamedDecl>(FunctionTemplate) 5227 : NewFD); 5228 5229 if (isFriend && D.isRedeclaration()) { 5230 AccessSpecifier Access = AS_public; 5231 if (!NewFD->isInvalidDecl()) 5232 Access = NewFD->getPreviousDeclaration()->getAccess(); 5233 5234 NewFD->setAccess(Access); 5235 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5236 5237 PrincipalDecl->setObjectOfFriendDecl(true); 5238 } 5239 5240 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5241 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5242 PrincipalDecl->setNonMemberOperator(); 5243 5244 // If we have a function template, check the template parameter 5245 // list. This will check and merge default template arguments. 5246 if (FunctionTemplate) { 5247 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5248 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5249 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5250 D.getDeclSpec().isFriendSpecified() 5251 ? (D.isFunctionDefinition() 5252 ? TPC_FriendFunctionTemplateDefinition 5253 : TPC_FriendFunctionTemplate) 5254 : (D.getCXXScopeSpec().isSet() && 5255 DC && DC->isRecord() && 5256 DC->isDependentContext()) 5257 ? TPC_ClassTemplateMember 5258 : TPC_FunctionTemplate); 5259 } 5260 5261 if (NewFD->isInvalidDecl()) { 5262 // Ignore all the rest of this. 5263 } else if (!D.isRedeclaration()) { 5264 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5265 AddToScope }; 5266 // Fake up an access specifier if it's supposed to be a class member. 5267 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5268 NewFD->setAccess(AS_public); 5269 5270 // Qualified decls generally require a previous declaration. 5271 if (D.getCXXScopeSpec().isSet()) { 5272 // ...with the major exception of templated-scope or 5273 // dependent-scope friend declarations. 5274 5275 // TODO: we currently also suppress this check in dependent 5276 // contexts because (1) the parameter depth will be off when 5277 // matching friend templates and (2) we might actually be 5278 // selecting a friend based on a dependent factor. But there 5279 // are situations where these conditions don't apply and we 5280 // can actually do this check immediately. 5281 if (isFriend && 5282 (TemplateParamLists.size() || 5283 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5284 CurContext->isDependentContext())) { 5285 // ignore these 5286 } else { 5287 // The user tried to provide an out-of-line definition for a 5288 // function that is a member of a class or namespace, but there 5289 // was no such member function declared (C++ [class.mfct]p2, 5290 // C++ [namespace.memdef]p2). For example: 5291 // 5292 // class X { 5293 // void f() const; 5294 // }; 5295 // 5296 // void X::f() { } // ill-formed 5297 // 5298 // Complain about this problem, and attempt to suggest close 5299 // matches (e.g., those that differ only in cv-qualifiers and 5300 // whether the parameter types are references). 5301 5302 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5303 NewFD, 5304 ExtraArgs)) { 5305 AddToScope = ExtraArgs.AddToScope; 5306 return Result; 5307 } 5308 } 5309 5310 // Unqualified local friend declarations are required to resolve 5311 // to something. 5312 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5313 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5314 NewFD, 5315 ExtraArgs)) { 5316 AddToScope = ExtraArgs.AddToScope; 5317 return Result; 5318 } 5319 } 5320 5321 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5322 !isFriend && !isFunctionTemplateSpecialization && 5323 !isExplicitSpecialization) { 5324 // An out-of-line member function declaration must also be a 5325 // definition (C++ [dcl.meaning]p1). 5326 // Note that this is not the case for explicit specializations of 5327 // function templates or member functions of class templates, per 5328 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5329 // for compatibility with old SWIG code which likes to generate them. 5330 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5331 << D.getCXXScopeSpec().getRange(); 5332 } 5333 } 5334 5335 5336 // Handle attributes. We need to have merged decls when handling attributes 5337 // (for example to check for conflicts, etc). 5338 // FIXME: This needs to happen before we merge declarations. Then, 5339 // let attribute merging cope with attribute conflicts. 5340 ProcessDeclAttributes(S, NewFD, D, 5341 /*NonInheritable=*/false, /*Inheritable=*/true); 5342 5343 // attributes declared post-definition are currently ignored 5344 // FIXME: This should happen during attribute merging 5345 if (D.isRedeclaration() && Previous.isSingleResult()) { 5346 const FunctionDecl *Def; 5347 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5348 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5349 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5350 Diag(Def->getLocation(), diag::note_previous_definition); 5351 } 5352 } 5353 5354 AddKnownFunctionAttributes(NewFD); 5355 5356 if (NewFD->hasAttr<OverloadableAttr>() && 5357 !NewFD->getType()->getAs<FunctionProtoType>()) { 5358 Diag(NewFD->getLocation(), 5359 diag::err_attribute_overloadable_no_prototype) 5360 << NewFD; 5361 5362 // Turn this into a variadic function with no parameters. 5363 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5364 FunctionProtoType::ExtProtoInfo EPI; 5365 EPI.Variadic = true; 5366 EPI.ExtInfo = FT->getExtInfo(); 5367 5368 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5369 NewFD->setType(R); 5370 } 5371 5372 // If there's a #pragma GCC visibility in scope, and this isn't a class 5373 // member, set the visibility of this function. 5374 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5375 AddPushedVisibilityAttribute(NewFD); 5376 5377 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5378 // marking the function. 5379 AddCFAuditedAttribute(NewFD); 5380 5381 // If this is a locally-scoped extern C function, update the 5382 // map of such names. 5383 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5384 && !NewFD->isInvalidDecl()) 5385 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5386 5387 // Set this FunctionDecl's range up to the right paren. 5388 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5389 5390 if (getLangOptions().CPlusPlus) { 5391 if (FunctionTemplate) { 5392 if (NewFD->isInvalidDecl()) 5393 FunctionTemplate->setInvalidDecl(); 5394 return FunctionTemplate; 5395 } 5396 } 5397 5398 MarkUnusedFileScopedDecl(NewFD); 5399 5400 if (getLangOptions().CUDA) 5401 if (IdentifierInfo *II = NewFD->getIdentifier()) 5402 if (!NewFD->isInvalidDecl() && 5403 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5404 if (II->isStr("cudaConfigureCall")) { 5405 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5406 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5407 5408 Context.setcudaConfigureCallDecl(NewFD); 5409 } 5410 } 5411 5412 // Here we have an function template explicit specialization at class scope. 5413 // The actually specialization will be postponed to template instatiation 5414 // time via the ClassScopeFunctionSpecializationDecl node. 5415 if (isDependentClassScopeExplicitSpecialization) { 5416 ClassScopeFunctionSpecializationDecl *NewSpec = 5417 ClassScopeFunctionSpecializationDecl::Create( 5418 Context, CurContext, SourceLocation(), 5419 cast<CXXMethodDecl>(NewFD)); 5420 CurContext->addDecl(NewSpec); 5421 AddToScope = false; 5422 } 5423 5424 return NewFD; 5425} 5426 5427/// \brief Perform semantic checking of a new function declaration. 5428/// 5429/// Performs semantic analysis of the new function declaration 5430/// NewFD. This routine performs all semantic checking that does not 5431/// require the actual declarator involved in the declaration, and is 5432/// used both for the declaration of functions as they are parsed 5433/// (called via ActOnDeclarator) and for the declaration of functions 5434/// that have been instantiated via C++ template instantiation (called 5435/// via InstantiateDecl). 5436/// 5437/// \param IsExplicitSpecialiation whether this new function declaration is 5438/// an explicit specialization of the previous declaration. 5439/// 5440/// This sets NewFD->isInvalidDecl() to true if there was an error. 5441/// 5442/// Returns true if the function declaration is a redeclaration. 5443bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5444 LookupResult &Previous, 5445 bool IsExplicitSpecialization) { 5446 assert(!NewFD->getResultType()->isVariablyModifiedType() 5447 && "Variably modified return types are not handled here"); 5448 5449 // Check for a previous declaration of this name. 5450 if (Previous.empty() && NewFD->isExternC()) { 5451 // Since we did not find anything by this name and we're declaring 5452 // an extern "C" function, look for a non-visible extern "C" 5453 // declaration with the same name. 5454 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5455 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5456 if (Pos != LocallyScopedExternalDecls.end()) 5457 Previous.addDecl(Pos->second); 5458 } 5459 5460 bool Redeclaration = false; 5461 5462 // Merge or overload the declaration with an existing declaration of 5463 // the same name, if appropriate. 5464 if (!Previous.empty()) { 5465 // Determine whether NewFD is an overload of PrevDecl or 5466 // a declaration that requires merging. If it's an overload, 5467 // there's no more work to do here; we'll just add the new 5468 // function to the scope. 5469 5470 NamedDecl *OldDecl = 0; 5471 if (!AllowOverloadingOfFunction(Previous, Context)) { 5472 Redeclaration = true; 5473 OldDecl = Previous.getFoundDecl(); 5474 } else { 5475 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5476 /*NewIsUsingDecl*/ false)) { 5477 case Ovl_Match: 5478 Redeclaration = true; 5479 break; 5480 5481 case Ovl_NonFunction: 5482 Redeclaration = true; 5483 break; 5484 5485 case Ovl_Overload: 5486 Redeclaration = false; 5487 break; 5488 } 5489 5490 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5491 // If a function name is overloadable in C, then every function 5492 // with that name must be marked "overloadable". 5493 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5494 << Redeclaration << NewFD; 5495 NamedDecl *OverloadedDecl = 0; 5496 if (Redeclaration) 5497 OverloadedDecl = OldDecl; 5498 else if (!Previous.empty()) 5499 OverloadedDecl = Previous.getRepresentativeDecl(); 5500 if (OverloadedDecl) 5501 Diag(OverloadedDecl->getLocation(), 5502 diag::note_attribute_overloadable_prev_overload); 5503 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5504 Context)); 5505 } 5506 } 5507 5508 if (Redeclaration) { 5509 // NewFD and OldDecl represent declarations that need to be 5510 // merged. 5511 if (MergeFunctionDecl(NewFD, OldDecl)) { 5512 NewFD->setInvalidDecl(); 5513 return Redeclaration; 5514 } 5515 5516 Previous.clear(); 5517 Previous.addDecl(OldDecl); 5518 5519 if (FunctionTemplateDecl *OldTemplateDecl 5520 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5521 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5522 FunctionTemplateDecl *NewTemplateDecl 5523 = NewFD->getDescribedFunctionTemplate(); 5524 assert(NewTemplateDecl && "Template/non-template mismatch"); 5525 if (CXXMethodDecl *Method 5526 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5527 Method->setAccess(OldTemplateDecl->getAccess()); 5528 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5529 } 5530 5531 // If this is an explicit specialization of a member that is a function 5532 // template, mark it as a member specialization. 5533 if (IsExplicitSpecialization && 5534 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5535 NewTemplateDecl->setMemberSpecialization(); 5536 assert(OldTemplateDecl->isMemberSpecialization()); 5537 } 5538 5539 if (OldTemplateDecl->isModulePrivate()) 5540 NewTemplateDecl->setModulePrivate(); 5541 5542 } else { 5543 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5544 NewFD->setAccess(OldDecl->getAccess()); 5545 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5546 } 5547 } 5548 } 5549 5550 // Semantic checking for this function declaration (in isolation). 5551 if (getLangOptions().CPlusPlus) { 5552 // C++-specific checks. 5553 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5554 CheckConstructor(Constructor); 5555 } else if (CXXDestructorDecl *Destructor = 5556 dyn_cast<CXXDestructorDecl>(NewFD)) { 5557 CXXRecordDecl *Record = Destructor->getParent(); 5558 QualType ClassType = Context.getTypeDeclType(Record); 5559 5560 // FIXME: Shouldn't we be able to perform this check even when the class 5561 // type is dependent? Both gcc and edg can handle that. 5562 if (!ClassType->isDependentType()) { 5563 DeclarationName Name 5564 = Context.DeclarationNames.getCXXDestructorName( 5565 Context.getCanonicalType(ClassType)); 5566 if (NewFD->getDeclName() != Name) { 5567 Diag(NewFD->getLocation(), diag::err_destructor_name); 5568 NewFD->setInvalidDecl(); 5569 return Redeclaration; 5570 } 5571 } 5572 } else if (CXXConversionDecl *Conversion 5573 = dyn_cast<CXXConversionDecl>(NewFD)) { 5574 ActOnConversionDeclarator(Conversion); 5575 } 5576 5577 // Find any virtual functions that this function overrides. 5578 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5579 if (!Method->isFunctionTemplateSpecialization() && 5580 !Method->getDescribedFunctionTemplate()) { 5581 if (AddOverriddenMethods(Method->getParent(), Method)) { 5582 // If the function was marked as "static", we have a problem. 5583 if (NewFD->getStorageClass() == SC_Static) { 5584 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5585 << NewFD->getDeclName(); 5586 for (CXXMethodDecl::method_iterator 5587 Overridden = Method->begin_overridden_methods(), 5588 OverriddenEnd = Method->end_overridden_methods(); 5589 Overridden != OverriddenEnd; 5590 ++Overridden) { 5591 Diag((*Overridden)->getLocation(), 5592 diag::note_overridden_virtual_function); 5593 } 5594 } 5595 } 5596 } 5597 } 5598 5599 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5600 if (NewFD->isOverloadedOperator() && 5601 CheckOverloadedOperatorDeclaration(NewFD)) { 5602 NewFD->setInvalidDecl(); 5603 return Redeclaration; 5604 } 5605 5606 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5607 if (NewFD->getLiteralIdentifier() && 5608 CheckLiteralOperatorDeclaration(NewFD)) { 5609 NewFD->setInvalidDecl(); 5610 return Redeclaration; 5611 } 5612 5613 // In C++, check default arguments now that we have merged decls. Unless 5614 // the lexical context is the class, because in this case this is done 5615 // during delayed parsing anyway. 5616 if (!CurContext->isRecord()) 5617 CheckCXXDefaultArguments(NewFD); 5618 5619 // If this function declares a builtin function, check the type of this 5620 // declaration against the expected type for the builtin. 5621 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5622 ASTContext::GetBuiltinTypeError Error; 5623 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5624 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5625 // The type of this function differs from the type of the builtin, 5626 // so forget about the builtin entirely. 5627 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5628 } 5629 } 5630 } 5631 return Redeclaration; 5632} 5633 5634void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5635 // C++ [basic.start.main]p3: A program that declares main to be inline 5636 // or static is ill-formed. 5637 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5638 // shall not appear in a declaration of main. 5639 // static main is not an error under C99, but we should warn about it. 5640 if (FD->getStorageClass() == SC_Static) 5641 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5642 ? diag::err_static_main : diag::warn_static_main) 5643 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5644 if (FD->isInlineSpecified()) 5645 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5646 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5647 5648 QualType T = FD->getType(); 5649 assert(T->isFunctionType() && "function decl is not of function type"); 5650 const FunctionType* FT = T->getAs<FunctionType>(); 5651 5652 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5653 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5654 FD->setInvalidDecl(true); 5655 } 5656 5657 // Treat protoless main() as nullary. 5658 if (isa<FunctionNoProtoType>(FT)) return; 5659 5660 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5661 unsigned nparams = FTP->getNumArgs(); 5662 assert(FD->getNumParams() == nparams); 5663 5664 bool HasExtraParameters = (nparams > 3); 5665 5666 // Darwin passes an undocumented fourth argument of type char**. If 5667 // other platforms start sprouting these, the logic below will start 5668 // getting shifty. 5669 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5670 HasExtraParameters = false; 5671 5672 if (HasExtraParameters) { 5673 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5674 FD->setInvalidDecl(true); 5675 nparams = 3; 5676 } 5677 5678 // FIXME: a lot of the following diagnostics would be improved 5679 // if we had some location information about types. 5680 5681 QualType CharPP = 5682 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5683 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5684 5685 for (unsigned i = 0; i < nparams; ++i) { 5686 QualType AT = FTP->getArgType(i); 5687 5688 bool mismatch = true; 5689 5690 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5691 mismatch = false; 5692 else if (Expected[i] == CharPP) { 5693 // As an extension, the following forms are okay: 5694 // char const ** 5695 // char const * const * 5696 // char * const * 5697 5698 QualifierCollector qs; 5699 const PointerType* PT; 5700 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5701 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5702 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5703 qs.removeConst(); 5704 mismatch = !qs.empty(); 5705 } 5706 } 5707 5708 if (mismatch) { 5709 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5710 // TODO: suggest replacing given type with expected type 5711 FD->setInvalidDecl(true); 5712 } 5713 } 5714 5715 if (nparams == 1 && !FD->isInvalidDecl()) { 5716 Diag(FD->getLocation(), diag::warn_main_one_arg); 5717 } 5718 5719 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5720 Diag(FD->getLocation(), diag::err_main_template_decl); 5721 FD->setInvalidDecl(); 5722 } 5723} 5724 5725bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5726 // FIXME: Need strict checking. In C89, we need to check for 5727 // any assignment, increment, decrement, function-calls, or 5728 // commas outside of a sizeof. In C99, it's the same list, 5729 // except that the aforementioned are allowed in unevaluated 5730 // expressions. Everything else falls under the 5731 // "may accept other forms of constant expressions" exception. 5732 // (We never end up here for C++, so the constant expression 5733 // rules there don't matter.) 5734 if (Init->isConstantInitializer(Context, false)) 5735 return false; 5736 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5737 << Init->getSourceRange(); 5738 return true; 5739} 5740 5741namespace { 5742 // Visits an initialization expression to see if OrigDecl is evaluated in 5743 // its own initialization and throws a warning if it does. 5744 class SelfReferenceChecker 5745 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5746 Sema &S; 5747 Decl *OrigDecl; 5748 bool isRecordType; 5749 bool isPODType; 5750 5751 public: 5752 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5753 5754 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5755 S(S), OrigDecl(OrigDecl) { 5756 isPODType = false; 5757 isRecordType = false; 5758 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5759 isPODType = VD->getType().isPODType(S.Context); 5760 isRecordType = VD->getType()->isRecordType(); 5761 } 5762 } 5763 5764 void VisitExpr(Expr *E) { 5765 if (isa<ObjCMessageExpr>(*E)) return; 5766 if (isRecordType) { 5767 Expr *expr = E; 5768 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5769 ValueDecl *VD = ME->getMemberDecl(); 5770 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5771 expr = ME->getBase(); 5772 } 5773 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5774 HandleDeclRefExpr(DRE); 5775 return; 5776 } 5777 } 5778 Inherited::VisitExpr(E); 5779 } 5780 5781 void VisitMemberExpr(MemberExpr *E) { 5782 if (E->getType()->canDecayToPointerType()) return; 5783 if (isa<FieldDecl>(E->getMemberDecl())) 5784 if (DeclRefExpr *DRE 5785 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5786 HandleDeclRefExpr(DRE); 5787 return; 5788 } 5789 Inherited::VisitMemberExpr(E); 5790 } 5791 5792 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5793 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5794 (isRecordType && E->getCastKind() == CK_NoOp)) { 5795 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5796 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5797 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5798 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5799 HandleDeclRefExpr(DRE); 5800 return; 5801 } 5802 } 5803 Inherited::VisitImplicitCastExpr(E); 5804 } 5805 5806 void VisitUnaryOperator(UnaryOperator *E) { 5807 // For POD record types, addresses of its own members are well-defined. 5808 if (isRecordType && isPODType) return; 5809 Inherited::VisitUnaryOperator(E); 5810 } 5811 5812 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5813 Decl* ReferenceDecl = DRE->getDecl(); 5814 if (OrigDecl != ReferenceDecl) return; 5815 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5816 Sema::NotForRedeclaration); 5817 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5818 S.PDiag(diag::warn_uninit_self_reference_in_init) 5819 << Result.getLookupName() 5820 << OrigDecl->getLocation() 5821 << DRE->getSourceRange()); 5822 } 5823 }; 5824} 5825 5826/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5827void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5828 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5829} 5830 5831/// AddInitializerToDecl - Adds the initializer Init to the 5832/// declaration dcl. If DirectInit is true, this is C++ direct 5833/// initialization rather than copy initialization. 5834void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5835 bool DirectInit, bool TypeMayContainAuto) { 5836 // If there is no declaration, there was an error parsing it. Just ignore 5837 // the initializer. 5838 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5839 return; 5840 5841 // Check for self-references within variable initializers. 5842 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5843 // Variables declared within a function/method body are handled 5844 // by a dataflow analysis. 5845 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5846 CheckSelfReference(RealDecl, Init); 5847 } 5848 else { 5849 CheckSelfReference(RealDecl, Init); 5850 } 5851 5852 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5853 // With declarators parsed the way they are, the parser cannot 5854 // distinguish between a normal initializer and a pure-specifier. 5855 // Thus this grotesque test. 5856 IntegerLiteral *IL; 5857 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5858 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5859 CheckPureMethod(Method, Init->getSourceRange()); 5860 else { 5861 Diag(Method->getLocation(), diag::err_member_function_initialization) 5862 << Method->getDeclName() << Init->getSourceRange(); 5863 Method->setInvalidDecl(); 5864 } 5865 return; 5866 } 5867 5868 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5869 if (!VDecl) { 5870 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5871 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5872 RealDecl->setInvalidDecl(); 5873 return; 5874 } 5875 5876 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5877 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5878 TypeSourceInfo *DeducedType = 0; 5879 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5880 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5881 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5882 << Init->getSourceRange(); 5883 if (!DeducedType) { 5884 RealDecl->setInvalidDecl(); 5885 return; 5886 } 5887 VDecl->setTypeSourceInfo(DeducedType); 5888 VDecl->setType(DeducedType->getType()); 5889 5890 // In ARC, infer lifetime. 5891 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5892 VDecl->setInvalidDecl(); 5893 5894 // If this is a redeclaration, check that the type we just deduced matches 5895 // the previously declared type. 5896 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5897 MergeVarDeclTypes(VDecl, Old); 5898 } 5899 5900 5901 // A definition must end up with a complete type, which means it must be 5902 // complete with the restriction that an array type might be completed by the 5903 // initializer; note that later code assumes this restriction. 5904 QualType BaseDeclType = VDecl->getType(); 5905 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5906 BaseDeclType = Array->getElementType(); 5907 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5908 diag::err_typecheck_decl_incomplete_type)) { 5909 RealDecl->setInvalidDecl(); 5910 return; 5911 } 5912 5913 // The variable can not have an abstract class type. 5914 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5915 diag::err_abstract_type_in_decl, 5916 AbstractVariableType)) 5917 VDecl->setInvalidDecl(); 5918 5919 const VarDecl *Def; 5920 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5921 Diag(VDecl->getLocation(), diag::err_redefinition) 5922 << VDecl->getDeclName(); 5923 Diag(Def->getLocation(), diag::note_previous_definition); 5924 VDecl->setInvalidDecl(); 5925 return; 5926 } 5927 5928 const VarDecl* PrevInit = 0; 5929 if (getLangOptions().CPlusPlus) { 5930 // C++ [class.static.data]p4 5931 // If a static data member is of const integral or const 5932 // enumeration type, its declaration in the class definition can 5933 // specify a constant-initializer which shall be an integral 5934 // constant expression (5.19). In that case, the member can appear 5935 // in integral constant expressions. The member shall still be 5936 // defined in a namespace scope if it is used in the program and the 5937 // namespace scope definition shall not contain an initializer. 5938 // 5939 // We already performed a redefinition check above, but for static 5940 // data members we also need to check whether there was an in-class 5941 // declaration with an initializer. 5942 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5943 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5944 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5945 return; 5946 } 5947 5948 if (VDecl->hasLocalStorage()) 5949 getCurFunction()->setHasBranchProtectedScope(); 5950 5951 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5952 VDecl->setInvalidDecl(); 5953 return; 5954 } 5955 } 5956 5957 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5958 // a kernel function cannot be initialized." 5959 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5960 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5961 VDecl->setInvalidDecl(); 5962 return; 5963 } 5964 5965 // Capture the variable that is being initialized and the style of 5966 // initialization. 5967 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5968 5969 // FIXME: Poor source location information. 5970 InitializationKind Kind 5971 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5972 Init->getLocStart(), 5973 Init->getLocEnd()) 5974 : InitializationKind::CreateCopy(VDecl->getLocation(), 5975 Init->getLocStart()); 5976 5977 // Get the decls type and save a reference for later, since 5978 // CheckInitializerTypes may change it. 5979 QualType DclT = VDecl->getType(), SavT = DclT; 5980 if (VDecl->isLocalVarDecl()) { 5981 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5982 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5983 VDecl->setInvalidDecl(); 5984 } else if (!VDecl->isInvalidDecl()) { 5985 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5986 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5987 MultiExprArg(*this, &Init, 1), 5988 &DclT); 5989 if (Result.isInvalid()) { 5990 VDecl->setInvalidDecl(); 5991 return; 5992 } 5993 5994 Init = Result.takeAs<Expr>(); 5995 5996 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5997 // Don't check invalid declarations to avoid emitting useless diagnostics. 5998 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5999 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6000 CheckForConstantInitializer(Init, DclT); 6001 } 6002 } 6003 } else if (VDecl->isStaticDataMember() && 6004 VDecl->getLexicalDeclContext()->isRecord()) { 6005 // This is an in-class initialization for a static data member, e.g., 6006 // 6007 // struct S { 6008 // static const int value = 17; 6009 // }; 6010 6011 // Try to perform the initialization regardless. 6012 if (!VDecl->isInvalidDecl()) { 6013 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6014 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6015 MultiExprArg(*this, &Init, 1), 6016 &DclT); 6017 if (Result.isInvalid()) { 6018 VDecl->setInvalidDecl(); 6019 return; 6020 } 6021 6022 Init = Result.takeAs<Expr>(); 6023 } 6024 6025 // C++ [class.mem]p4: 6026 // A member-declarator can contain a constant-initializer only 6027 // if it declares a static member (9.4) of const integral or 6028 // const enumeration type, see 9.4.2. 6029 // 6030 // C++0x [class.static.data]p3: 6031 // If a non-volatile const static data member is of integral or 6032 // enumeration type, its declaration in the class definition can 6033 // specify a brace-or-equal-initializer in which every initalizer-clause 6034 // that is an assignment-expression is a constant expression. A static 6035 // data member of literal type can be declared in the class definition 6036 // with the constexpr specifier; if so, its declaration shall specify a 6037 // brace-or-equal-initializer in which every initializer-clause that is 6038 // an assignment-expression is a constant expression. 6039 QualType T = VDecl->getType(); 6040 6041 // Do nothing on dependent types. 6042 if (T->isDependentType()) { 6043 6044 // Allow any 'static constexpr' members, whether or not they are of literal 6045 // type. We separately check that the initializer is a constant expression, 6046 // which implicitly requires the member to be of literal type. 6047 } else if (VDecl->isConstexpr()) { 6048 6049 // Require constness. 6050 } else if (!T.isConstQualified()) { 6051 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6052 << Init->getSourceRange(); 6053 VDecl->setInvalidDecl(); 6054 6055 // We allow integer constant expressions in all cases. 6056 } else if (T->isIntegralOrEnumerationType()) { 6057 // Check whether the expression is a constant expression. 6058 SourceLocation Loc; 6059 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6060 // In C++0x, a non-constexpr const static data member with an 6061 // in-class initializer cannot be volatile. 6062 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6063 else if (Init->isValueDependent()) 6064 ; // Nothing to check. 6065 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6066 ; // Ok, it's an ICE! 6067 else if (Init->isEvaluatable(Context)) { 6068 // If we can constant fold the initializer through heroics, accept it, 6069 // but report this as a use of an extension for -pedantic. 6070 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6071 << Init->getSourceRange(); 6072 } else { 6073 // Otherwise, this is some crazy unknown case. Report the issue at the 6074 // location provided by the isIntegerConstantExpr failed check. 6075 Diag(Loc, diag::err_in_class_initializer_non_constant) 6076 << Init->getSourceRange(); 6077 VDecl->setInvalidDecl(); 6078 } 6079 6080 // We allow floating-point constants as an extension. 6081 } else if (T->isFloatingType()) { // also permits complex, which is ok 6082 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6083 << T << Init->getSourceRange(); 6084 if (getLangOptions().CPlusPlus0x) 6085 Diag(VDecl->getLocation(), 6086 diag::note_in_class_initializer_float_type_constexpr) 6087 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6088 6089 if (!Init->isValueDependent() && 6090 !Init->isConstantInitializer(Context, false)) { 6091 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6092 << Init->getSourceRange(); 6093 VDecl->setInvalidDecl(); 6094 } 6095 6096 // Suggest adding 'constexpr' in C++0x for literal types. 6097 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6098 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6099 << T << Init->getSourceRange() 6100 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6101 VDecl->setConstexpr(true); 6102 6103 } else { 6104 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6105 << T << Init->getSourceRange(); 6106 VDecl->setInvalidDecl(); 6107 } 6108 } else if (VDecl->isFileVarDecl()) { 6109 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6110 (!getLangOptions().CPlusPlus || 6111 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6112 Diag(VDecl->getLocation(), diag::warn_extern_init); 6113 if (!VDecl->isInvalidDecl()) { 6114 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6115 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6116 MultiExprArg(*this, &Init, 1), 6117 &DclT); 6118 if (Result.isInvalid()) { 6119 VDecl->setInvalidDecl(); 6120 return; 6121 } 6122 6123 Init = Result.takeAs<Expr>(); 6124 } 6125 6126 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6127 // Don't check invalid declarations to avoid emitting useless diagnostics. 6128 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6129 // C99 6.7.8p4. All file scoped initializers need to be constant. 6130 CheckForConstantInitializer(Init, DclT); 6131 } 6132 } 6133 // If the type changed, it means we had an incomplete type that was 6134 // completed by the initializer. For example: 6135 // int ary[] = { 1, 3, 5 }; 6136 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6137 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6138 VDecl->setType(DclT); 6139 Init->setType(DclT); 6140 } 6141 6142 // Check any implicit conversions within the expression. 6143 CheckImplicitConversions(Init, VDecl->getLocation()); 6144 6145 if (!VDecl->isInvalidDecl()) 6146 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6147 6148 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6149 !VDecl->getType()->isDependentType() && 6150 !Init->isTypeDependent() && !Init->isValueDependent() && 6151 !Init->isConstantInitializer(Context, 6152 VDecl->getType()->isReferenceType())) { 6153 // FIXME: Improve this diagnostic to explain why the initializer is not 6154 // a constant expression. 6155 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6156 << VDecl << Init->getSourceRange(); 6157 } 6158 6159 Init = MaybeCreateExprWithCleanups(Init); 6160 // Attach the initializer to the decl. 6161 VDecl->setInit(Init); 6162 6163 CheckCompleteVariableDeclaration(VDecl); 6164} 6165 6166/// ActOnInitializerError - Given that there was an error parsing an 6167/// initializer for the given declaration, try to return to some form 6168/// of sanity. 6169void Sema::ActOnInitializerError(Decl *D) { 6170 // Our main concern here is re-establishing invariants like "a 6171 // variable's type is either dependent or complete". 6172 if (!D || D->isInvalidDecl()) return; 6173 6174 VarDecl *VD = dyn_cast<VarDecl>(D); 6175 if (!VD) return; 6176 6177 // Auto types are meaningless if we can't make sense of the initializer. 6178 if (ParsingInitForAutoVars.count(D)) { 6179 D->setInvalidDecl(); 6180 return; 6181 } 6182 6183 QualType Ty = VD->getType(); 6184 if (Ty->isDependentType()) return; 6185 6186 // Require a complete type. 6187 if (RequireCompleteType(VD->getLocation(), 6188 Context.getBaseElementType(Ty), 6189 diag::err_typecheck_decl_incomplete_type)) { 6190 VD->setInvalidDecl(); 6191 return; 6192 } 6193 6194 // Require an abstract type. 6195 if (RequireNonAbstractType(VD->getLocation(), Ty, 6196 diag::err_abstract_type_in_decl, 6197 AbstractVariableType)) { 6198 VD->setInvalidDecl(); 6199 return; 6200 } 6201 6202 // Don't bother complaining about constructors or destructors, 6203 // though. 6204} 6205 6206void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6207 bool TypeMayContainAuto) { 6208 // If there is no declaration, there was an error parsing it. Just ignore it. 6209 if (RealDecl == 0) 6210 return; 6211 6212 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6213 QualType Type = Var->getType(); 6214 6215 // C++0x [dcl.spec.auto]p3 6216 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6217 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6218 << Var->getDeclName() << Type; 6219 Var->setInvalidDecl(); 6220 return; 6221 } 6222 6223 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6224 // have an initializer. 6225 // C++0x [class.static.data]p3: A static data member can be declared with 6226 // the constexpr specifier; if so, its declaration shall specify 6227 // a brace-or-equal-initializer. 6228 // 6229 // A static data member's definition may inherit an initializer from an 6230 // in-class declaration. 6231 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6232 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6233 << Var->getDeclName(); 6234 Var->setInvalidDecl(); 6235 return; 6236 } 6237 6238 switch (Var->isThisDeclarationADefinition()) { 6239 case VarDecl::Definition: 6240 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6241 break; 6242 6243 // We have an out-of-line definition of a static data member 6244 // that has an in-class initializer, so we type-check this like 6245 // a declaration. 6246 // 6247 // Fall through 6248 6249 case VarDecl::DeclarationOnly: 6250 // It's only a declaration. 6251 6252 // Block scope. C99 6.7p7: If an identifier for an object is 6253 // declared with no linkage (C99 6.2.2p6), the type for the 6254 // object shall be complete. 6255 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6256 !Var->getLinkage() && !Var->isInvalidDecl() && 6257 RequireCompleteType(Var->getLocation(), Type, 6258 diag::err_typecheck_decl_incomplete_type)) 6259 Var->setInvalidDecl(); 6260 6261 // Make sure that the type is not abstract. 6262 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6263 RequireNonAbstractType(Var->getLocation(), Type, 6264 diag::err_abstract_type_in_decl, 6265 AbstractVariableType)) 6266 Var->setInvalidDecl(); 6267 return; 6268 6269 case VarDecl::TentativeDefinition: 6270 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6271 // object that has file scope without an initializer, and without a 6272 // storage-class specifier or with the storage-class specifier "static", 6273 // constitutes a tentative definition. Note: A tentative definition with 6274 // external linkage is valid (C99 6.2.2p5). 6275 if (!Var->isInvalidDecl()) { 6276 if (const IncompleteArrayType *ArrayT 6277 = Context.getAsIncompleteArrayType(Type)) { 6278 if (RequireCompleteType(Var->getLocation(), 6279 ArrayT->getElementType(), 6280 diag::err_illegal_decl_array_incomplete_type)) 6281 Var->setInvalidDecl(); 6282 } else if (Var->getStorageClass() == SC_Static) { 6283 // C99 6.9.2p3: If the declaration of an identifier for an object is 6284 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6285 // declared type shall not be an incomplete type. 6286 // NOTE: code such as the following 6287 // static struct s; 6288 // struct s { int a; }; 6289 // is accepted by gcc. Hence here we issue a warning instead of 6290 // an error and we do not invalidate the static declaration. 6291 // NOTE: to avoid multiple warnings, only check the first declaration. 6292 if (Var->getPreviousDeclaration() == 0) 6293 RequireCompleteType(Var->getLocation(), Type, 6294 diag::ext_typecheck_decl_incomplete_type); 6295 } 6296 } 6297 6298 // Record the tentative definition; we're done. 6299 if (!Var->isInvalidDecl()) 6300 TentativeDefinitions.push_back(Var); 6301 return; 6302 } 6303 6304 // Provide a specific diagnostic for uninitialized variable 6305 // definitions with incomplete array type. 6306 if (Type->isIncompleteArrayType()) { 6307 Diag(Var->getLocation(), 6308 diag::err_typecheck_incomplete_array_needs_initializer); 6309 Var->setInvalidDecl(); 6310 return; 6311 } 6312 6313 // Provide a specific diagnostic for uninitialized variable 6314 // definitions with reference type. 6315 if (Type->isReferenceType()) { 6316 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6317 << Var->getDeclName() 6318 << SourceRange(Var->getLocation(), Var->getLocation()); 6319 Var->setInvalidDecl(); 6320 return; 6321 } 6322 6323 // Do not attempt to type-check the default initializer for a 6324 // variable with dependent type. 6325 if (Type->isDependentType()) 6326 return; 6327 6328 if (Var->isInvalidDecl()) 6329 return; 6330 6331 if (RequireCompleteType(Var->getLocation(), 6332 Context.getBaseElementType(Type), 6333 diag::err_typecheck_decl_incomplete_type)) { 6334 Var->setInvalidDecl(); 6335 return; 6336 } 6337 6338 // The variable can not have an abstract class type. 6339 if (RequireNonAbstractType(Var->getLocation(), Type, 6340 diag::err_abstract_type_in_decl, 6341 AbstractVariableType)) { 6342 Var->setInvalidDecl(); 6343 return; 6344 } 6345 6346 // Check for jumps past the implicit initializer. C++0x 6347 // clarifies that this applies to a "variable with automatic 6348 // storage duration", not a "local variable". 6349 // C++0x [stmt.dcl]p3 6350 // A program that jumps from a point where a variable with automatic 6351 // storage duration is not in scope to a point where it is in scope is 6352 // ill-formed unless the variable has scalar type, class type with a 6353 // trivial default constructor and a trivial destructor, a cv-qualified 6354 // version of one of these types, or an array of one of the preceding 6355 // types and is declared without an initializer. 6356 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6357 if (const RecordType *Record 6358 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6359 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6360 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6361 (getLangOptions().CPlusPlus0x && 6362 (!CXXRecord->hasTrivialDefaultConstructor() || 6363 !CXXRecord->hasTrivialDestructor()))) 6364 getCurFunction()->setHasBranchProtectedScope(); 6365 } 6366 } 6367 6368 // C++03 [dcl.init]p9: 6369 // If no initializer is specified for an object, and the 6370 // object is of (possibly cv-qualified) non-POD class type (or 6371 // array thereof), the object shall be default-initialized; if 6372 // the object is of const-qualified type, the underlying class 6373 // type shall have a user-declared default 6374 // constructor. Otherwise, if no initializer is specified for 6375 // a non- static object, the object and its subobjects, if 6376 // any, have an indeterminate initial value); if the object 6377 // or any of its subobjects are of const-qualified type, the 6378 // program is ill-formed. 6379 // C++0x [dcl.init]p11: 6380 // If no initializer is specified for an object, the object is 6381 // default-initialized; [...]. 6382 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6383 InitializationKind Kind 6384 = InitializationKind::CreateDefault(Var->getLocation()); 6385 6386 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6387 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6388 MultiExprArg(*this, 0, 0)); 6389 if (Init.isInvalid()) 6390 Var->setInvalidDecl(); 6391 else if (Init.get()) 6392 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6393 6394 CheckCompleteVariableDeclaration(Var); 6395 } 6396} 6397 6398void Sema::ActOnCXXForRangeDecl(Decl *D) { 6399 VarDecl *VD = dyn_cast<VarDecl>(D); 6400 if (!VD) { 6401 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6402 D->setInvalidDecl(); 6403 return; 6404 } 6405 6406 VD->setCXXForRangeDecl(true); 6407 6408 // for-range-declaration cannot be given a storage class specifier. 6409 int Error = -1; 6410 switch (VD->getStorageClassAsWritten()) { 6411 case SC_None: 6412 break; 6413 case SC_Extern: 6414 Error = 0; 6415 break; 6416 case SC_Static: 6417 Error = 1; 6418 break; 6419 case SC_PrivateExtern: 6420 Error = 2; 6421 break; 6422 case SC_Auto: 6423 Error = 3; 6424 break; 6425 case SC_Register: 6426 Error = 4; 6427 break; 6428 case SC_OpenCLWorkGroupLocal: 6429 llvm_unreachable("Unexpected storage class"); 6430 } 6431 if (VD->isConstexpr()) 6432 Error = 5; 6433 if (Error != -1) { 6434 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6435 << VD->getDeclName() << Error; 6436 D->setInvalidDecl(); 6437 } 6438} 6439 6440void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6441 if (var->isInvalidDecl()) return; 6442 6443 // In ARC, don't allow jumps past the implicit initialization of a 6444 // local retaining variable. 6445 if (getLangOptions().ObjCAutoRefCount && 6446 var->hasLocalStorage()) { 6447 switch (var->getType().getObjCLifetime()) { 6448 case Qualifiers::OCL_None: 6449 case Qualifiers::OCL_ExplicitNone: 6450 case Qualifiers::OCL_Autoreleasing: 6451 break; 6452 6453 case Qualifiers::OCL_Weak: 6454 case Qualifiers::OCL_Strong: 6455 getCurFunction()->setHasBranchProtectedScope(); 6456 break; 6457 } 6458 } 6459 6460 // All the following checks are C++ only. 6461 if (!getLangOptions().CPlusPlus) return; 6462 6463 QualType baseType = Context.getBaseElementType(var->getType()); 6464 if (baseType->isDependentType()) return; 6465 6466 // __block variables might require us to capture a copy-initializer. 6467 if (var->hasAttr<BlocksAttr>()) { 6468 // It's currently invalid to ever have a __block variable with an 6469 // array type; should we diagnose that here? 6470 6471 // Regardless, we don't want to ignore array nesting when 6472 // constructing this copy. 6473 QualType type = var->getType(); 6474 6475 if (type->isStructureOrClassType()) { 6476 SourceLocation poi = var->getLocation(); 6477 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6478 ExprResult result = 6479 PerformCopyInitialization( 6480 InitializedEntity::InitializeBlock(poi, type, false), 6481 poi, Owned(varRef)); 6482 if (!result.isInvalid()) { 6483 result = MaybeCreateExprWithCleanups(result); 6484 Expr *init = result.takeAs<Expr>(); 6485 Context.setBlockVarCopyInits(var, init); 6486 } 6487 } 6488 } 6489 6490 // Check for global constructors. 6491 if (!var->getDeclContext()->isDependentContext() && 6492 var->hasGlobalStorage() && 6493 !var->isStaticLocal() && 6494 var->getInit() && 6495 !var->getInit()->isConstantInitializer(Context, 6496 baseType->isReferenceType())) 6497 Diag(var->getLocation(), diag::warn_global_constructor) 6498 << var->getInit()->getSourceRange(); 6499 6500 // Require the destructor. 6501 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6502 FinalizeVarWithDestructor(var, recordType); 6503} 6504 6505/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6506/// any semantic actions necessary after any initializer has been attached. 6507void 6508Sema::FinalizeDeclaration(Decl *ThisDecl) { 6509 // Note that we are no longer parsing the initializer for this declaration. 6510 ParsingInitForAutoVars.erase(ThisDecl); 6511} 6512 6513Sema::DeclGroupPtrTy 6514Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6515 Decl **Group, unsigned NumDecls) { 6516 SmallVector<Decl*, 8> Decls; 6517 6518 if (DS.isTypeSpecOwned()) 6519 Decls.push_back(DS.getRepAsDecl()); 6520 6521 for (unsigned i = 0; i != NumDecls; ++i) 6522 if (Decl *D = Group[i]) 6523 Decls.push_back(D); 6524 6525 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6526 DS.getTypeSpecType() == DeclSpec::TST_auto); 6527} 6528 6529/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6530/// group, performing any necessary semantic checking. 6531Sema::DeclGroupPtrTy 6532Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6533 bool TypeMayContainAuto) { 6534 // C++0x [dcl.spec.auto]p7: 6535 // If the type deduced for the template parameter U is not the same in each 6536 // deduction, the program is ill-formed. 6537 // FIXME: When initializer-list support is added, a distinction is needed 6538 // between the deduced type U and the deduced type which 'auto' stands for. 6539 // auto a = 0, b = { 1, 2, 3 }; 6540 // is legal because the deduced type U is 'int' in both cases. 6541 if (TypeMayContainAuto && NumDecls > 1) { 6542 QualType Deduced; 6543 CanQualType DeducedCanon; 6544 VarDecl *DeducedDecl = 0; 6545 for (unsigned i = 0; i != NumDecls; ++i) { 6546 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6547 AutoType *AT = D->getType()->getContainedAutoType(); 6548 // Don't reissue diagnostics when instantiating a template. 6549 if (AT && D->isInvalidDecl()) 6550 break; 6551 if (AT && AT->isDeduced()) { 6552 QualType U = AT->getDeducedType(); 6553 CanQualType UCanon = Context.getCanonicalType(U); 6554 if (Deduced.isNull()) { 6555 Deduced = U; 6556 DeducedCanon = UCanon; 6557 DeducedDecl = D; 6558 } else if (DeducedCanon != UCanon) { 6559 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6560 diag::err_auto_different_deductions) 6561 << Deduced << DeducedDecl->getDeclName() 6562 << U << D->getDeclName() 6563 << DeducedDecl->getInit()->getSourceRange() 6564 << D->getInit()->getSourceRange(); 6565 D->setInvalidDecl(); 6566 break; 6567 } 6568 } 6569 } 6570 } 6571 } 6572 6573 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6574} 6575 6576 6577/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6578/// to introduce parameters into function prototype scope. 6579Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6580 const DeclSpec &DS = D.getDeclSpec(); 6581 6582 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6583 VarDecl::StorageClass StorageClass = SC_None; 6584 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6585 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6586 StorageClass = SC_Register; 6587 StorageClassAsWritten = SC_Register; 6588 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6589 Diag(DS.getStorageClassSpecLoc(), 6590 diag::err_invalid_storage_class_in_func_decl); 6591 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6592 } 6593 6594 if (D.getDeclSpec().isThreadSpecified()) 6595 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6596 if (D.getDeclSpec().isConstexprSpecified()) 6597 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6598 << 0; 6599 6600 DiagnoseFunctionSpecifiers(D); 6601 6602 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6603 QualType parmDeclType = TInfo->getType(); 6604 6605 if (getLangOptions().CPlusPlus) { 6606 // Check that there are no default arguments inside the type of this 6607 // parameter. 6608 CheckExtraCXXDefaultArguments(D); 6609 6610 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6611 if (D.getCXXScopeSpec().isSet()) { 6612 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6613 << D.getCXXScopeSpec().getRange(); 6614 D.getCXXScopeSpec().clear(); 6615 } 6616 } 6617 6618 // Ensure we have a valid name 6619 IdentifierInfo *II = 0; 6620 if (D.hasName()) { 6621 II = D.getIdentifier(); 6622 if (!II) { 6623 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6624 << GetNameForDeclarator(D).getName().getAsString(); 6625 D.setInvalidType(true); 6626 } 6627 } 6628 6629 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6630 if (II) { 6631 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6632 ForRedeclaration); 6633 LookupName(R, S); 6634 if (R.isSingleResult()) { 6635 NamedDecl *PrevDecl = R.getFoundDecl(); 6636 if (PrevDecl->isTemplateParameter()) { 6637 // Maybe we will complain about the shadowed template parameter. 6638 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6639 // Just pretend that we didn't see the previous declaration. 6640 PrevDecl = 0; 6641 } else if (S->isDeclScope(PrevDecl)) { 6642 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6643 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6644 6645 // Recover by removing the name 6646 II = 0; 6647 D.SetIdentifier(0, D.getIdentifierLoc()); 6648 D.setInvalidType(true); 6649 } 6650 } 6651 } 6652 6653 // Temporarily put parameter variables in the translation unit, not 6654 // the enclosing context. This prevents them from accidentally 6655 // looking like class members in C++. 6656 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6657 D.getSourceRange().getBegin(), 6658 D.getIdentifierLoc(), II, 6659 parmDeclType, TInfo, 6660 StorageClass, StorageClassAsWritten); 6661 6662 if (D.isInvalidType()) 6663 New->setInvalidDecl(); 6664 6665 assert(S->isFunctionPrototypeScope()); 6666 assert(S->getFunctionPrototypeDepth() >= 1); 6667 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6668 S->getNextFunctionPrototypeIndex()); 6669 6670 // Add the parameter declaration into this scope. 6671 S->AddDecl(New); 6672 if (II) 6673 IdResolver.AddDecl(New); 6674 6675 ProcessDeclAttributes(S, New, D); 6676 6677 if (D.getDeclSpec().isModulePrivateSpecified()) 6678 Diag(New->getLocation(), diag::err_module_private_local) 6679 << 1 << New->getDeclName() 6680 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6681 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6682 6683 if (New->hasAttr<BlocksAttr>()) { 6684 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6685 } 6686 return New; 6687} 6688 6689/// \brief Synthesizes a variable for a parameter arising from a 6690/// typedef. 6691ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6692 SourceLocation Loc, 6693 QualType T) { 6694 /* FIXME: setting StartLoc == Loc. 6695 Would it be worth to modify callers so as to provide proper source 6696 location for the unnamed parameters, embedding the parameter's type? */ 6697 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6698 T, Context.getTrivialTypeSourceInfo(T, Loc), 6699 SC_None, SC_None, 0); 6700 Param->setImplicit(); 6701 return Param; 6702} 6703 6704void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6705 ParmVarDecl * const *ParamEnd) { 6706 // Don't diagnose unused-parameter errors in template instantiations; we 6707 // will already have done so in the template itself. 6708 if (!ActiveTemplateInstantiations.empty()) 6709 return; 6710 6711 for (; Param != ParamEnd; ++Param) { 6712 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6713 !(*Param)->hasAttr<UnusedAttr>()) { 6714 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6715 << (*Param)->getDeclName(); 6716 } 6717 } 6718} 6719 6720void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6721 ParmVarDecl * const *ParamEnd, 6722 QualType ReturnTy, 6723 NamedDecl *D) { 6724 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6725 return; 6726 6727 // Warn if the return value is pass-by-value and larger than the specified 6728 // threshold. 6729 if (ReturnTy.isPODType(Context)) { 6730 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6731 if (Size > LangOpts.NumLargeByValueCopy) 6732 Diag(D->getLocation(), diag::warn_return_value_size) 6733 << D->getDeclName() << Size; 6734 } 6735 6736 // Warn if any parameter is pass-by-value and larger than the specified 6737 // threshold. 6738 for (; Param != ParamEnd; ++Param) { 6739 QualType T = (*Param)->getType(); 6740 if (!T.isPODType(Context)) 6741 continue; 6742 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6743 if (Size > LangOpts.NumLargeByValueCopy) 6744 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6745 << (*Param)->getDeclName() << Size; 6746 } 6747} 6748 6749ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6750 SourceLocation NameLoc, IdentifierInfo *Name, 6751 QualType T, TypeSourceInfo *TSInfo, 6752 VarDecl::StorageClass StorageClass, 6753 VarDecl::StorageClass StorageClassAsWritten) { 6754 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6755 if (getLangOptions().ObjCAutoRefCount && 6756 T.getObjCLifetime() == Qualifiers::OCL_None && 6757 T->isObjCLifetimeType()) { 6758 6759 Qualifiers::ObjCLifetime lifetime; 6760 6761 // Special cases for arrays: 6762 // - if it's const, use __unsafe_unretained 6763 // - otherwise, it's an error 6764 if (T->isArrayType()) { 6765 if (!T.isConstQualified()) { 6766 DelayedDiagnostics.add( 6767 sema::DelayedDiagnostic::makeForbiddenType( 6768 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6769 } 6770 lifetime = Qualifiers::OCL_ExplicitNone; 6771 } else { 6772 lifetime = T->getObjCARCImplicitLifetime(); 6773 } 6774 T = Context.getLifetimeQualifiedType(T, lifetime); 6775 } 6776 6777 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6778 Context.getAdjustedParameterType(T), 6779 TSInfo, 6780 StorageClass, StorageClassAsWritten, 6781 0); 6782 6783 // Parameters can not be abstract class types. 6784 // For record types, this is done by the AbstractClassUsageDiagnoser once 6785 // the class has been completely parsed. 6786 if (!CurContext->isRecord() && 6787 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6788 AbstractParamType)) 6789 New->setInvalidDecl(); 6790 6791 // Parameter declarators cannot be interface types. All ObjC objects are 6792 // passed by reference. 6793 if (T->isObjCObjectType()) { 6794 Diag(NameLoc, 6795 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6796 << FixItHint::CreateInsertion(NameLoc, "*"); 6797 T = Context.getObjCObjectPointerType(T); 6798 New->setType(T); 6799 } 6800 6801 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6802 // duration shall not be qualified by an address-space qualifier." 6803 // Since all parameters have automatic store duration, they can not have 6804 // an address space. 6805 if (T.getAddressSpace() != 0) { 6806 Diag(NameLoc, diag::err_arg_with_address_space); 6807 New->setInvalidDecl(); 6808 } 6809 6810 return New; 6811} 6812 6813void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6814 SourceLocation LocAfterDecls) { 6815 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6816 6817 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6818 // for a K&R function. 6819 if (!FTI.hasPrototype) { 6820 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6821 --i; 6822 if (FTI.ArgInfo[i].Param == 0) { 6823 llvm::SmallString<256> Code; 6824 llvm::raw_svector_ostream(Code) << " int " 6825 << FTI.ArgInfo[i].Ident->getName() 6826 << ";\n"; 6827 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6828 << FTI.ArgInfo[i].Ident 6829 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6830 6831 // Implicitly declare the argument as type 'int' for lack of a better 6832 // type. 6833 AttributeFactory attrs; 6834 DeclSpec DS(attrs); 6835 const char* PrevSpec; // unused 6836 unsigned DiagID; // unused 6837 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6838 PrevSpec, DiagID); 6839 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6840 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6841 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6842 } 6843 } 6844 } 6845} 6846 6847Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6848 Declarator &D) { 6849 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6850 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6851 Scope *ParentScope = FnBodyScope->getParent(); 6852 6853 D.setFunctionDefinition(true); 6854 Decl *DP = HandleDeclarator(ParentScope, D, 6855 MultiTemplateParamsArg(*this)); 6856 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6857} 6858 6859static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6860 // Don't warn about invalid declarations. 6861 if (FD->isInvalidDecl()) 6862 return false; 6863 6864 // Or declarations that aren't global. 6865 if (!FD->isGlobal()) 6866 return false; 6867 6868 // Don't warn about C++ member functions. 6869 if (isa<CXXMethodDecl>(FD)) 6870 return false; 6871 6872 // Don't warn about 'main'. 6873 if (FD->isMain()) 6874 return false; 6875 6876 // Don't warn about inline functions. 6877 if (FD->isInlined()) 6878 return false; 6879 6880 // Don't warn about function templates. 6881 if (FD->getDescribedFunctionTemplate()) 6882 return false; 6883 6884 // Don't warn about function template specializations. 6885 if (FD->isFunctionTemplateSpecialization()) 6886 return false; 6887 6888 bool MissingPrototype = true; 6889 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6890 Prev; Prev = Prev->getPreviousDeclaration()) { 6891 // Ignore any declarations that occur in function or method 6892 // scope, because they aren't visible from the header. 6893 if (Prev->getDeclContext()->isFunctionOrMethod()) 6894 continue; 6895 6896 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6897 break; 6898 } 6899 6900 return MissingPrototype; 6901} 6902 6903void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6904 // Don't complain if we're in GNU89 mode and the previous definition 6905 // was an extern inline function. 6906 const FunctionDecl *Definition; 6907 if (FD->isDefined(Definition) && 6908 !canRedefineFunction(Definition, getLangOptions())) { 6909 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6910 Definition->getStorageClass() == SC_Extern) 6911 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6912 << FD->getDeclName() << getLangOptions().CPlusPlus; 6913 else 6914 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6915 Diag(Definition->getLocation(), diag::note_previous_definition); 6916 } 6917} 6918 6919Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6920 // Clear the last template instantiation error context. 6921 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6922 6923 if (!D) 6924 return D; 6925 FunctionDecl *FD = 0; 6926 6927 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6928 FD = FunTmpl->getTemplatedDecl(); 6929 else 6930 FD = cast<FunctionDecl>(D); 6931 6932 // Enter a new function scope 6933 PushFunctionScope(); 6934 6935 // See if this is a redefinition. 6936 if (!FD->isLateTemplateParsed()) 6937 CheckForFunctionRedefinition(FD); 6938 6939 // Builtin functions cannot be defined. 6940 if (unsigned BuiltinID = FD->getBuiltinID()) { 6941 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6942 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6943 FD->setInvalidDecl(); 6944 } 6945 } 6946 6947 // The return type of a function definition must be complete 6948 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6949 QualType ResultType = FD->getResultType(); 6950 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6951 !FD->isInvalidDecl() && 6952 RequireCompleteType(FD->getLocation(), ResultType, 6953 diag::err_func_def_incomplete_result)) 6954 FD->setInvalidDecl(); 6955 6956 // GNU warning -Wmissing-prototypes: 6957 // Warn if a global function is defined without a previous 6958 // prototype declaration. This warning is issued even if the 6959 // definition itself provides a prototype. The aim is to detect 6960 // global functions that fail to be declared in header files. 6961 if (ShouldWarnAboutMissingPrototype(FD)) 6962 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6963 6964 if (FnBodyScope) 6965 PushDeclContext(FnBodyScope, FD); 6966 6967 // Check the validity of our function parameters 6968 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6969 /*CheckParameterNames=*/true); 6970 6971 // Introduce our parameters into the function scope 6972 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6973 ParmVarDecl *Param = FD->getParamDecl(p); 6974 Param->setOwningFunction(FD); 6975 6976 // If this has an identifier, add it to the scope stack. 6977 if (Param->getIdentifier() && FnBodyScope) { 6978 CheckShadow(FnBodyScope, Param); 6979 6980 PushOnScopeChains(Param, FnBodyScope); 6981 } 6982 } 6983 6984 // Checking attributes of current function definition 6985 // dllimport attribute. 6986 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6987 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6988 // dllimport attribute cannot be directly applied to definition. 6989 // Microsoft accepts dllimport for functions defined within class scope. 6990 if (!DA->isInherited() && 6991 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6992 Diag(FD->getLocation(), 6993 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6994 << "dllimport"; 6995 FD->setInvalidDecl(); 6996 return FD; 6997 } 6998 6999 // Visual C++ appears to not think this is an issue, so only issue 7000 // a warning when Microsoft extensions are disabled. 7001 if (!LangOpts.MicrosoftExt) { 7002 // If a symbol previously declared dllimport is later defined, the 7003 // attribute is ignored in subsequent references, and a warning is 7004 // emitted. 7005 Diag(FD->getLocation(), 7006 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7007 << FD->getName() << "dllimport"; 7008 } 7009 } 7010 return FD; 7011} 7012 7013/// \brief Given the set of return statements within a function body, 7014/// compute the variables that are subject to the named return value 7015/// optimization. 7016/// 7017/// Each of the variables that is subject to the named return value 7018/// optimization will be marked as NRVO variables in the AST, and any 7019/// return statement that has a marked NRVO variable as its NRVO candidate can 7020/// use the named return value optimization. 7021/// 7022/// This function applies a very simplistic algorithm for NRVO: if every return 7023/// statement in the function has the same NRVO candidate, that candidate is 7024/// the NRVO variable. 7025/// 7026/// FIXME: Employ a smarter algorithm that accounts for multiple return 7027/// statements and the lifetimes of the NRVO candidates. We should be able to 7028/// find a maximal set of NRVO variables. 7029void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7030 ReturnStmt **Returns = Scope->Returns.data(); 7031 7032 const VarDecl *NRVOCandidate = 0; 7033 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7034 if (!Returns[I]->getNRVOCandidate()) 7035 return; 7036 7037 if (!NRVOCandidate) 7038 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7039 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7040 return; 7041 } 7042 7043 if (NRVOCandidate) 7044 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7045} 7046 7047Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7048 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7049} 7050 7051Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7052 bool IsInstantiation) { 7053 FunctionDecl *FD = 0; 7054 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7055 if (FunTmpl) 7056 FD = FunTmpl->getTemplatedDecl(); 7057 else 7058 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7059 7060 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7061 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7062 7063 if (FD) { 7064 FD->setBody(Body); 7065 if (FD->isMain()) { 7066 // C and C++ allow for main to automagically return 0. 7067 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7068 FD->setHasImplicitReturnZero(true); 7069 WP.disableCheckFallThrough(); 7070 } else if (FD->hasAttr<NakedAttr>()) { 7071 // If the function is marked 'naked', don't complain about missing return 7072 // statements. 7073 WP.disableCheckFallThrough(); 7074 } 7075 7076 // MSVC permits the use of pure specifier (=0) on function definition, 7077 // defined at class scope, warn about this non standard construct. 7078 if (getLangOptions().MicrosoftExt && FD->isPure()) 7079 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7080 7081 if (!FD->isInvalidDecl()) { 7082 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7083 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7084 FD->getResultType(), FD); 7085 7086 // If this is a constructor, we need a vtable. 7087 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7088 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7089 7090 computeNRVO(Body, getCurFunction()); 7091 } 7092 7093 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7094 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7095 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7096 MD->setBody(Body); 7097 if (Body) 7098 MD->setEndLoc(Body->getLocEnd()); 7099 if (!MD->isInvalidDecl()) { 7100 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7101 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7102 MD->getResultType(), MD); 7103 7104 if (Body) 7105 computeNRVO(Body, getCurFunction()); 7106 } 7107 if (ObjCShouldCallSuperDealloc) { 7108 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7109 ObjCShouldCallSuperDealloc = false; 7110 } 7111 if (ObjCShouldCallSuperFinalize) { 7112 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7113 ObjCShouldCallSuperFinalize = false; 7114 } 7115 } else { 7116 return 0; 7117 } 7118 7119 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7120 "ObjC methods, which should have been handled in the block above."); 7121 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7122 "ObjC methods, which should have been handled in the block above."); 7123 7124 // Verify and clean out per-function state. 7125 if (Body) { 7126 // C++ constructors that have function-try-blocks can't have return 7127 // statements in the handlers of that block. (C++ [except.handle]p14) 7128 // Verify this. 7129 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7130 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7131 7132 // Verify that gotos and switch cases don't jump into scopes illegally. 7133 if (getCurFunction()->NeedsScopeChecking() && 7134 !dcl->isInvalidDecl() && 7135 !hasAnyUnrecoverableErrorsInThisFunction()) 7136 DiagnoseInvalidJumps(Body); 7137 7138 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7139 if (!Destructor->getParent()->isDependentType()) 7140 CheckDestructor(Destructor); 7141 7142 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7143 Destructor->getParent()); 7144 } 7145 7146 // If any errors have occurred, clear out any temporaries that may have 7147 // been leftover. This ensures that these temporaries won't be picked up for 7148 // deletion in some later function. 7149 if (PP.getDiagnostics().hasErrorOccurred() || 7150 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7151 ExprTemporaries.clear(); 7152 ExprNeedsCleanups = false; 7153 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7154 // Since the body is valid, issue any analysis-based warnings that are 7155 // enabled. 7156 ActivePolicy = &WP; 7157 } 7158 7159 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7160 !CheckConstexprFunctionBody(FD, Body)) 7161 FD->setInvalidDecl(); 7162 7163 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7164 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7165 } 7166 7167 if (!IsInstantiation) 7168 PopDeclContext(); 7169 7170 PopFunctionOrBlockScope(ActivePolicy, dcl); 7171 7172 // If any errors have occurred, clear out any temporaries that may have 7173 // been leftover. This ensures that these temporaries won't be picked up for 7174 // deletion in some later function. 7175 if (getDiagnostics().hasErrorOccurred()) { 7176 ExprTemporaries.clear(); 7177 ExprNeedsCleanups = false; 7178 } 7179 7180 return dcl; 7181} 7182 7183 7184/// When we finish delayed parsing of an attribute, we must attach it to the 7185/// relevant Decl. 7186void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7187 ParsedAttributes &Attrs) { 7188 ProcessDeclAttributeList(S, D, Attrs.getList()); 7189} 7190 7191 7192/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7193/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7194NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7195 IdentifierInfo &II, Scope *S) { 7196 // Before we produce a declaration for an implicitly defined 7197 // function, see whether there was a locally-scoped declaration of 7198 // this name as a function or variable. If so, use that 7199 // (non-visible) declaration, and complain about it. 7200 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7201 = findLocallyScopedExternalDecl(&II); 7202 if (Pos != LocallyScopedExternalDecls.end()) { 7203 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7204 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7205 return Pos->second; 7206 } 7207 7208 // Extension in C99. Legal in C90, but warn about it. 7209 if (II.getName().startswith("__builtin_")) 7210 Diag(Loc, diag::warn_builtin_unknown) << &II; 7211 else if (getLangOptions().C99) 7212 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7213 else 7214 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7215 7216 // Set a Declarator for the implicit definition: int foo(); 7217 const char *Dummy; 7218 AttributeFactory attrFactory; 7219 DeclSpec DS(attrFactory); 7220 unsigned DiagID; 7221 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7222 (void)Error; // Silence warning. 7223 assert(!Error && "Error setting up implicit decl!"); 7224 Declarator D(DS, Declarator::BlockContext); 7225 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7226 0, 0, true, SourceLocation(), 7227 SourceLocation(), SourceLocation(), 7228 SourceLocation(), 7229 EST_None, SourceLocation(), 7230 0, 0, 0, 0, Loc, Loc, D), 7231 DS.getAttributes(), 7232 SourceLocation()); 7233 D.SetIdentifier(&II, Loc); 7234 7235 // Insert this function into translation-unit scope. 7236 7237 DeclContext *PrevDC = CurContext; 7238 CurContext = Context.getTranslationUnitDecl(); 7239 7240 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7241 FD->setImplicit(); 7242 7243 CurContext = PrevDC; 7244 7245 AddKnownFunctionAttributes(FD); 7246 7247 return FD; 7248} 7249 7250/// \brief Adds any function attributes that we know a priori based on 7251/// the declaration of this function. 7252/// 7253/// These attributes can apply both to implicitly-declared builtins 7254/// (like __builtin___printf_chk) or to library-declared functions 7255/// like NSLog or printf. 7256/// 7257/// We need to check for duplicate attributes both here and where user-written 7258/// attributes are applied to declarations. 7259void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7260 if (FD->isInvalidDecl()) 7261 return; 7262 7263 // If this is a built-in function, map its builtin attributes to 7264 // actual attributes. 7265 if (unsigned BuiltinID = FD->getBuiltinID()) { 7266 // Handle printf-formatting attributes. 7267 unsigned FormatIdx; 7268 bool HasVAListArg; 7269 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7270 if (!FD->getAttr<FormatAttr>()) 7271 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7272 "printf", FormatIdx+1, 7273 HasVAListArg ? 0 : FormatIdx+2)); 7274 } 7275 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7276 HasVAListArg)) { 7277 if (!FD->getAttr<FormatAttr>()) 7278 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7279 "scanf", FormatIdx+1, 7280 HasVAListArg ? 0 : FormatIdx+2)); 7281 } 7282 7283 // Mark const if we don't care about errno and that is the only 7284 // thing preventing the function from being const. This allows 7285 // IRgen to use LLVM intrinsics for such functions. 7286 if (!getLangOptions().MathErrno && 7287 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7288 if (!FD->getAttr<ConstAttr>()) 7289 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7290 } 7291 7292 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7293 !FD->getAttr<ReturnsTwiceAttr>()) 7294 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7295 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7296 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7297 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7298 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7299 } 7300 7301 IdentifierInfo *Name = FD->getIdentifier(); 7302 if (!Name) 7303 return; 7304 if ((!getLangOptions().CPlusPlus && 7305 FD->getDeclContext()->isTranslationUnit()) || 7306 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7307 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7308 LinkageSpecDecl::lang_c)) { 7309 // Okay: this could be a libc/libm/Objective-C function we know 7310 // about. 7311 } else 7312 return; 7313 7314 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7315 // FIXME: NSLog and NSLogv should be target specific 7316 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7317 // FIXME: We known better than our headers. 7318 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7319 } else 7320 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7321 "printf", 1, 7322 Name->isStr("NSLogv") ? 0 : 2)); 7323 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7324 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7325 // target-specific builtins, perhaps? 7326 if (!FD->getAttr<FormatAttr>()) 7327 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7328 "printf", 2, 7329 Name->isStr("vasprintf") ? 0 : 3)); 7330 } 7331} 7332 7333TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7334 TypeSourceInfo *TInfo) { 7335 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7336 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7337 7338 if (!TInfo) { 7339 assert(D.isInvalidType() && "no declarator info for valid type"); 7340 TInfo = Context.getTrivialTypeSourceInfo(T); 7341 } 7342 7343 // Scope manipulation handled by caller. 7344 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7345 D.getSourceRange().getBegin(), 7346 D.getIdentifierLoc(), 7347 D.getIdentifier(), 7348 TInfo); 7349 7350 // Bail out immediately if we have an invalid declaration. 7351 if (D.isInvalidType()) { 7352 NewTD->setInvalidDecl(); 7353 return NewTD; 7354 } 7355 7356 if (D.getDeclSpec().isModulePrivateSpecified()) { 7357 if (CurContext->isFunctionOrMethod()) 7358 Diag(NewTD->getLocation(), diag::err_module_private_local) 7359 << 2 << NewTD->getDeclName() 7360 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7361 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7362 else 7363 NewTD->setModulePrivate(); 7364 } 7365 7366 // C++ [dcl.typedef]p8: 7367 // If the typedef declaration defines an unnamed class (or 7368 // enum), the first typedef-name declared by the declaration 7369 // to be that class type (or enum type) is used to denote the 7370 // class type (or enum type) for linkage purposes only. 7371 // We need to check whether the type was declared in the declaration. 7372 switch (D.getDeclSpec().getTypeSpecType()) { 7373 case TST_enum: 7374 case TST_struct: 7375 case TST_union: 7376 case TST_class: { 7377 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7378 7379 // Do nothing if the tag is not anonymous or already has an 7380 // associated typedef (from an earlier typedef in this decl group). 7381 if (tagFromDeclSpec->getIdentifier()) break; 7382 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7383 7384 // A well-formed anonymous tag must always be a TUK_Definition. 7385 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7386 7387 // The type must match the tag exactly; no qualifiers allowed. 7388 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7389 break; 7390 7391 // Otherwise, set this is the anon-decl typedef for the tag. 7392 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7393 break; 7394 } 7395 7396 default: 7397 break; 7398 } 7399 7400 return NewTD; 7401} 7402 7403 7404/// \brief Determine whether a tag with a given kind is acceptable 7405/// as a redeclaration of the given tag declaration. 7406/// 7407/// \returns true if the new tag kind is acceptable, false otherwise. 7408bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7409 TagTypeKind NewTag, bool isDefinition, 7410 SourceLocation NewTagLoc, 7411 const IdentifierInfo &Name) { 7412 // C++ [dcl.type.elab]p3: 7413 // The class-key or enum keyword present in the 7414 // elaborated-type-specifier shall agree in kind with the 7415 // declaration to which the name in the elaborated-type-specifier 7416 // refers. This rule also applies to the form of 7417 // elaborated-type-specifier that declares a class-name or 7418 // friend class since it can be construed as referring to the 7419 // definition of the class. Thus, in any 7420 // elaborated-type-specifier, the enum keyword shall be used to 7421 // refer to an enumeration (7.2), the union class-key shall be 7422 // used to refer to a union (clause 9), and either the class or 7423 // struct class-key shall be used to refer to a class (clause 9) 7424 // declared using the class or struct class-key. 7425 TagTypeKind OldTag = Previous->getTagKind(); 7426 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7427 if (OldTag == NewTag) 7428 return true; 7429 7430 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7431 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7432 // Warn about the struct/class tag mismatch. 7433 bool isTemplate = false; 7434 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7435 isTemplate = Record->getDescribedClassTemplate(); 7436 7437 if (!ActiveTemplateInstantiations.empty()) { 7438 // In a template instantiation, do not offer fix-its for tag mismatches 7439 // since they usually mess up the template instead of fixing the problem. 7440 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7441 << (NewTag == TTK_Class) << isTemplate << &Name; 7442 return true; 7443 } 7444 7445 if (isDefinition) { 7446 // On definitions, check previous tags and issue a fix-it for each 7447 // one that doesn't match the current tag. 7448 if (Previous->getDefinition()) { 7449 // Don't suggest fix-its for redefinitions. 7450 return true; 7451 } 7452 7453 bool previousMismatch = false; 7454 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7455 E(Previous->redecls_end()); I != E; ++I) { 7456 if (I->getTagKind() != NewTag) { 7457 if (!previousMismatch) { 7458 previousMismatch = true; 7459 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7460 << (NewTag == TTK_Class) << isTemplate << &Name; 7461 } 7462 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7463 << (NewTag == TTK_Class) 7464 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7465 NewTag == TTK_Class? 7466 "class" : "struct"); 7467 } 7468 } 7469 return true; 7470 } 7471 7472 // Check for a previous definition. If current tag and definition 7473 // are same type, do nothing. If no definition, but disagree with 7474 // with previous tag type, give a warning, but no fix-it. 7475 const TagDecl *Redecl = Previous->getDefinition() ? 7476 Previous->getDefinition() : Previous; 7477 if (Redecl->getTagKind() == NewTag) { 7478 return true; 7479 } 7480 7481 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7482 << (NewTag == TTK_Class) 7483 << isTemplate << &Name; 7484 Diag(Redecl->getLocation(), diag::note_previous_use); 7485 7486 // If there is a previous defintion, suggest a fix-it. 7487 if (Previous->getDefinition()) { 7488 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7489 << (Redecl->getTagKind() == TTK_Class) 7490 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7491 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7492 } 7493 7494 return true; 7495 } 7496 return false; 7497} 7498 7499/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7500/// former case, Name will be non-null. In the later case, Name will be null. 7501/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7502/// reference/declaration/definition of a tag. 7503Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7504 SourceLocation KWLoc, CXXScopeSpec &SS, 7505 IdentifierInfo *Name, SourceLocation NameLoc, 7506 AttributeList *Attr, AccessSpecifier AS, 7507 SourceLocation ModulePrivateLoc, 7508 MultiTemplateParamsArg TemplateParameterLists, 7509 bool &OwnedDecl, bool &IsDependent, 7510 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7511 TypeResult UnderlyingType) { 7512 // If this is not a definition, it must have a name. 7513 assert((Name != 0 || TUK == TUK_Definition) && 7514 "Nameless record must be a definition!"); 7515 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7516 7517 OwnedDecl = false; 7518 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7519 7520 // FIXME: Check explicit specializations more carefully. 7521 bool isExplicitSpecialization = false; 7522 bool Invalid = false; 7523 7524 // We only need to do this matching if we have template parameters 7525 // or a scope specifier, which also conveniently avoids this work 7526 // for non-C++ cases. 7527 if (TemplateParameterLists.size() > 0 || 7528 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7529 if (TemplateParameterList *TemplateParams 7530 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7531 TemplateParameterLists.get(), 7532 TemplateParameterLists.size(), 7533 TUK == TUK_Friend, 7534 isExplicitSpecialization, 7535 Invalid)) { 7536 if (TemplateParams->size() > 0) { 7537 // This is a declaration or definition of a class template (which may 7538 // be a member of another template). 7539 7540 if (Invalid) 7541 return 0; 7542 7543 OwnedDecl = false; 7544 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7545 SS, Name, NameLoc, Attr, 7546 TemplateParams, AS, 7547 ModulePrivateLoc, 7548 TemplateParameterLists.size() - 1, 7549 (TemplateParameterList**) TemplateParameterLists.release()); 7550 return Result.get(); 7551 } else { 7552 // The "template<>" header is extraneous. 7553 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7554 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7555 isExplicitSpecialization = true; 7556 } 7557 } 7558 } 7559 7560 // Figure out the underlying type if this a enum declaration. We need to do 7561 // this early, because it's needed to detect if this is an incompatible 7562 // redeclaration. 7563 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7564 7565 if (Kind == TTK_Enum) { 7566 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7567 // No underlying type explicitly specified, or we failed to parse the 7568 // type, default to int. 7569 EnumUnderlying = Context.IntTy.getTypePtr(); 7570 else if (UnderlyingType.get()) { 7571 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7572 // integral type; any cv-qualification is ignored. 7573 TypeSourceInfo *TI = 0; 7574 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7575 EnumUnderlying = TI; 7576 7577 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7578 7579 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7580 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7581 << T; 7582 // Recover by falling back to int. 7583 EnumUnderlying = Context.IntTy.getTypePtr(); 7584 } 7585 7586 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7587 UPPC_FixedUnderlyingType)) 7588 EnumUnderlying = Context.IntTy.getTypePtr(); 7589 7590 } else if (getLangOptions().MicrosoftExt) 7591 // Microsoft enums are always of int type. 7592 EnumUnderlying = Context.IntTy.getTypePtr(); 7593 } 7594 7595 DeclContext *SearchDC = CurContext; 7596 DeclContext *DC = CurContext; 7597 bool isStdBadAlloc = false; 7598 7599 RedeclarationKind Redecl = ForRedeclaration; 7600 if (TUK == TUK_Friend || TUK == TUK_Reference) 7601 Redecl = NotForRedeclaration; 7602 7603 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7604 7605 if (Name && SS.isNotEmpty()) { 7606 // We have a nested-name tag ('struct foo::bar'). 7607 7608 // Check for invalid 'foo::'. 7609 if (SS.isInvalid()) { 7610 Name = 0; 7611 goto CreateNewDecl; 7612 } 7613 7614 // If this is a friend or a reference to a class in a dependent 7615 // context, don't try to make a decl for it. 7616 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7617 DC = computeDeclContext(SS, false); 7618 if (!DC) { 7619 IsDependent = true; 7620 return 0; 7621 } 7622 } else { 7623 DC = computeDeclContext(SS, true); 7624 if (!DC) { 7625 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7626 << SS.getRange(); 7627 return 0; 7628 } 7629 } 7630 7631 if (RequireCompleteDeclContext(SS, DC)) 7632 return 0; 7633 7634 SearchDC = DC; 7635 // Look-up name inside 'foo::'. 7636 LookupQualifiedName(Previous, DC); 7637 7638 if (Previous.isAmbiguous()) 7639 return 0; 7640 7641 if (Previous.empty()) { 7642 // Name lookup did not find anything. However, if the 7643 // nested-name-specifier refers to the current instantiation, 7644 // and that current instantiation has any dependent base 7645 // classes, we might find something at instantiation time: treat 7646 // this as a dependent elaborated-type-specifier. 7647 // But this only makes any sense for reference-like lookups. 7648 if (Previous.wasNotFoundInCurrentInstantiation() && 7649 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7650 IsDependent = true; 7651 return 0; 7652 } 7653 7654 // A tag 'foo::bar' must already exist. 7655 Diag(NameLoc, diag::err_not_tag_in_scope) 7656 << Kind << Name << DC << SS.getRange(); 7657 Name = 0; 7658 Invalid = true; 7659 goto CreateNewDecl; 7660 } 7661 } else if (Name) { 7662 // If this is a named struct, check to see if there was a previous forward 7663 // declaration or definition. 7664 // FIXME: We're looking into outer scopes here, even when we 7665 // shouldn't be. Doing so can result in ambiguities that we 7666 // shouldn't be diagnosing. 7667 LookupName(Previous, S); 7668 7669 if (Previous.isAmbiguous() && 7670 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7671 LookupResult::Filter F = Previous.makeFilter(); 7672 while (F.hasNext()) { 7673 NamedDecl *ND = F.next(); 7674 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7675 F.erase(); 7676 } 7677 F.done(); 7678 } 7679 7680 // Note: there used to be some attempt at recovery here. 7681 if (Previous.isAmbiguous()) 7682 return 0; 7683 7684 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7685 // FIXME: This makes sure that we ignore the contexts associated 7686 // with C structs, unions, and enums when looking for a matching 7687 // tag declaration or definition. See the similar lookup tweak 7688 // in Sema::LookupName; is there a better way to deal with this? 7689 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7690 SearchDC = SearchDC->getParent(); 7691 } 7692 } else if (S->isFunctionPrototypeScope()) { 7693 // If this is an enum declaration in function prototype scope, set its 7694 // initial context to the translation unit. 7695 SearchDC = Context.getTranslationUnitDecl(); 7696 } 7697 7698 if (Previous.isSingleResult() && 7699 Previous.getFoundDecl()->isTemplateParameter()) { 7700 // Maybe we will complain about the shadowed template parameter. 7701 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7702 // Just pretend that we didn't see the previous declaration. 7703 Previous.clear(); 7704 } 7705 7706 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7707 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7708 // This is a declaration of or a reference to "std::bad_alloc". 7709 isStdBadAlloc = true; 7710 7711 if (Previous.empty() && StdBadAlloc) { 7712 // std::bad_alloc has been implicitly declared (but made invisible to 7713 // name lookup). Fill in this implicit declaration as the previous 7714 // declaration, so that the declarations get chained appropriately. 7715 Previous.addDecl(getStdBadAlloc()); 7716 } 7717 } 7718 7719 // If we didn't find a previous declaration, and this is a reference 7720 // (or friend reference), move to the correct scope. In C++, we 7721 // also need to do a redeclaration lookup there, just in case 7722 // there's a shadow friend decl. 7723 if (Name && Previous.empty() && 7724 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7725 if (Invalid) goto CreateNewDecl; 7726 assert(SS.isEmpty()); 7727 7728 if (TUK == TUK_Reference) { 7729 // C++ [basic.scope.pdecl]p5: 7730 // -- for an elaborated-type-specifier of the form 7731 // 7732 // class-key identifier 7733 // 7734 // if the elaborated-type-specifier is used in the 7735 // decl-specifier-seq or parameter-declaration-clause of a 7736 // function defined in namespace scope, the identifier is 7737 // declared as a class-name in the namespace that contains 7738 // the declaration; otherwise, except as a friend 7739 // declaration, the identifier is declared in the smallest 7740 // non-class, non-function-prototype scope that contains the 7741 // declaration. 7742 // 7743 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7744 // C structs and unions. 7745 // 7746 // It is an error in C++ to declare (rather than define) an enum 7747 // type, including via an elaborated type specifier. We'll 7748 // diagnose that later; for now, declare the enum in the same 7749 // scope as we would have picked for any other tag type. 7750 // 7751 // GNU C also supports this behavior as part of its incomplete 7752 // enum types extension, while GNU C++ does not. 7753 // 7754 // Find the context where we'll be declaring the tag. 7755 // FIXME: We would like to maintain the current DeclContext as the 7756 // lexical context, 7757 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7758 SearchDC = SearchDC->getParent(); 7759 7760 // Find the scope where we'll be declaring the tag. 7761 while (S->isClassScope() || 7762 (getLangOptions().CPlusPlus && 7763 S->isFunctionPrototypeScope()) || 7764 ((S->getFlags() & Scope::DeclScope) == 0) || 7765 (S->getEntity() && 7766 ((DeclContext *)S->getEntity())->isTransparentContext())) 7767 S = S->getParent(); 7768 } else { 7769 assert(TUK == TUK_Friend); 7770 // C++ [namespace.memdef]p3: 7771 // If a friend declaration in a non-local class first declares a 7772 // class or function, the friend class or function is a member of 7773 // the innermost enclosing namespace. 7774 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7775 } 7776 7777 // In C++, we need to do a redeclaration lookup to properly 7778 // diagnose some problems. 7779 if (getLangOptions().CPlusPlus) { 7780 Previous.setRedeclarationKind(ForRedeclaration); 7781 LookupQualifiedName(Previous, SearchDC); 7782 } 7783 } 7784 7785 if (!Previous.empty()) { 7786 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7787 7788 // It's okay to have a tag decl in the same scope as a typedef 7789 // which hides a tag decl in the same scope. Finding this 7790 // insanity with a redeclaration lookup can only actually happen 7791 // in C++. 7792 // 7793 // This is also okay for elaborated-type-specifiers, which is 7794 // technically forbidden by the current standard but which is 7795 // okay according to the likely resolution of an open issue; 7796 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7797 if (getLangOptions().CPlusPlus) { 7798 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7799 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7800 TagDecl *Tag = TT->getDecl(); 7801 if (Tag->getDeclName() == Name && 7802 Tag->getDeclContext()->getRedeclContext() 7803 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7804 PrevDecl = Tag; 7805 Previous.clear(); 7806 Previous.addDecl(Tag); 7807 Previous.resolveKind(); 7808 } 7809 } 7810 } 7811 } 7812 7813 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7814 // If this is a use of a previous tag, or if the tag is already declared 7815 // in the same scope (so that the definition/declaration completes or 7816 // rementions the tag), reuse the decl. 7817 if (TUK == TUK_Reference || TUK == TUK_Friend || 7818 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7819 // Make sure that this wasn't declared as an enum and now used as a 7820 // struct or something similar. 7821 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7822 TUK == TUK_Definition, KWLoc, 7823 *Name)) { 7824 bool SafeToContinue 7825 = (PrevTagDecl->getTagKind() != TTK_Enum && 7826 Kind != TTK_Enum); 7827 if (SafeToContinue) 7828 Diag(KWLoc, diag::err_use_with_wrong_tag) 7829 << Name 7830 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7831 PrevTagDecl->getKindName()); 7832 else 7833 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7834 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7835 7836 if (SafeToContinue) 7837 Kind = PrevTagDecl->getTagKind(); 7838 else { 7839 // Recover by making this an anonymous redefinition. 7840 Name = 0; 7841 Previous.clear(); 7842 Invalid = true; 7843 } 7844 } 7845 7846 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7847 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7848 7849 // All conflicts with previous declarations are recovered by 7850 // returning the previous declaration. 7851 if (ScopedEnum != PrevEnum->isScoped()) { 7852 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7853 << PrevEnum->isScoped(); 7854 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7855 return PrevTagDecl; 7856 } 7857 else if (EnumUnderlying && PrevEnum->isFixed()) { 7858 QualType T; 7859 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7860 T = TI->getType(); 7861 else 7862 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7863 7864 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7865 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7866 diag::err_enum_redeclare_type_mismatch) 7867 << T 7868 << PrevEnum->getIntegerType(); 7869 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7870 return PrevTagDecl; 7871 } 7872 } 7873 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7874 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7875 << PrevEnum->isFixed(); 7876 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7877 return PrevTagDecl; 7878 } 7879 } 7880 7881 if (!Invalid) { 7882 // If this is a use, just return the declaration we found. 7883 7884 // FIXME: In the future, return a variant or some other clue 7885 // for the consumer of this Decl to know it doesn't own it. 7886 // For our current ASTs this shouldn't be a problem, but will 7887 // need to be changed with DeclGroups. 7888 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7889 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7890 return PrevTagDecl; 7891 7892 // Diagnose attempts to redefine a tag. 7893 if (TUK == TUK_Definition) { 7894 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7895 // If we're defining a specialization and the previous definition 7896 // is from an implicit instantiation, don't emit an error 7897 // here; we'll catch this in the general case below. 7898 if (!isExplicitSpecialization || 7899 !isa<CXXRecordDecl>(Def) || 7900 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7901 == TSK_ExplicitSpecialization) { 7902 Diag(NameLoc, diag::err_redefinition) << Name; 7903 Diag(Def->getLocation(), diag::note_previous_definition); 7904 // If this is a redefinition, recover by making this 7905 // struct be anonymous, which will make any later 7906 // references get the previous definition. 7907 Name = 0; 7908 Previous.clear(); 7909 Invalid = true; 7910 } 7911 } else { 7912 // If the type is currently being defined, complain 7913 // about a nested redefinition. 7914 const TagType *Tag 7915 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7916 if (Tag->isBeingDefined()) { 7917 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7918 Diag(PrevTagDecl->getLocation(), 7919 diag::note_previous_definition); 7920 Name = 0; 7921 Previous.clear(); 7922 Invalid = true; 7923 } 7924 } 7925 7926 // Okay, this is definition of a previously declared or referenced 7927 // tag PrevDecl. We're going to create a new Decl for it. 7928 } 7929 } 7930 // If we get here we have (another) forward declaration or we 7931 // have a definition. Just create a new decl. 7932 7933 } else { 7934 // If we get here, this is a definition of a new tag type in a nested 7935 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7936 // new decl/type. We set PrevDecl to NULL so that the entities 7937 // have distinct types. 7938 Previous.clear(); 7939 } 7940 // If we get here, we're going to create a new Decl. If PrevDecl 7941 // is non-NULL, it's a definition of the tag declared by 7942 // PrevDecl. If it's NULL, we have a new definition. 7943 7944 7945 // Otherwise, PrevDecl is not a tag, but was found with tag 7946 // lookup. This is only actually possible in C++, where a few 7947 // things like templates still live in the tag namespace. 7948 } else { 7949 assert(getLangOptions().CPlusPlus); 7950 7951 // Use a better diagnostic if an elaborated-type-specifier 7952 // found the wrong kind of type on the first 7953 // (non-redeclaration) lookup. 7954 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7955 !Previous.isForRedeclaration()) { 7956 unsigned Kind = 0; 7957 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7958 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7959 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7960 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7961 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7962 Invalid = true; 7963 7964 // Otherwise, only diagnose if the declaration is in scope. 7965 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7966 isExplicitSpecialization)) { 7967 // do nothing 7968 7969 // Diagnose implicit declarations introduced by elaborated types. 7970 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7971 unsigned Kind = 0; 7972 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7973 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7974 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7975 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7976 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7977 Invalid = true; 7978 7979 // Otherwise it's a declaration. Call out a particularly common 7980 // case here. 7981 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7982 unsigned Kind = 0; 7983 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7984 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7985 << Name << Kind << TND->getUnderlyingType(); 7986 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7987 Invalid = true; 7988 7989 // Otherwise, diagnose. 7990 } else { 7991 // The tag name clashes with something else in the target scope, 7992 // issue an error and recover by making this tag be anonymous. 7993 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7994 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7995 Name = 0; 7996 Invalid = true; 7997 } 7998 7999 // The existing declaration isn't relevant to us; we're in a 8000 // new scope, so clear out the previous declaration. 8001 Previous.clear(); 8002 } 8003 } 8004 8005CreateNewDecl: 8006 8007 TagDecl *PrevDecl = 0; 8008 if (Previous.isSingleResult()) 8009 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8010 8011 // If there is an identifier, use the location of the identifier as the 8012 // location of the decl, otherwise use the location of the struct/union 8013 // keyword. 8014 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8015 8016 // Otherwise, create a new declaration. If there is a previous 8017 // declaration of the same entity, the two will be linked via 8018 // PrevDecl. 8019 TagDecl *New; 8020 8021 bool IsForwardReference = false; 8022 if (Kind == TTK_Enum) { 8023 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8024 // enum X { A, B, C } D; D should chain to X. 8025 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8026 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8027 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8028 // If this is an undefined enum, warn. 8029 if (TUK != TUK_Definition && !Invalid) { 8030 TagDecl *Def; 8031 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8032 // C++0x: 7.2p2: opaque-enum-declaration. 8033 // Conflicts are diagnosed above. Do nothing. 8034 } 8035 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8036 Diag(Loc, diag::ext_forward_ref_enum_def) 8037 << New; 8038 Diag(Def->getLocation(), diag::note_previous_definition); 8039 } else { 8040 unsigned DiagID = diag::ext_forward_ref_enum; 8041 if (getLangOptions().MicrosoftExt) 8042 DiagID = diag::ext_ms_forward_ref_enum; 8043 else if (getLangOptions().CPlusPlus) 8044 DiagID = diag::err_forward_ref_enum; 8045 Diag(Loc, DiagID); 8046 8047 // If this is a forward-declared reference to an enumeration, make a 8048 // note of it; we won't actually be introducing the declaration into 8049 // the declaration context. 8050 if (TUK == TUK_Reference) 8051 IsForwardReference = true; 8052 } 8053 } 8054 8055 if (EnumUnderlying) { 8056 EnumDecl *ED = cast<EnumDecl>(New); 8057 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8058 ED->setIntegerTypeSourceInfo(TI); 8059 else 8060 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8061 ED->setPromotionType(ED->getIntegerType()); 8062 } 8063 8064 } else { 8065 // struct/union/class 8066 8067 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8068 // struct X { int A; } D; D should chain to X. 8069 if (getLangOptions().CPlusPlus) { 8070 // FIXME: Look for a way to use RecordDecl for simple structs. 8071 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8072 cast_or_null<CXXRecordDecl>(PrevDecl)); 8073 8074 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8075 StdBadAlloc = cast<CXXRecordDecl>(New); 8076 } else 8077 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8078 cast_or_null<RecordDecl>(PrevDecl)); 8079 } 8080 8081 // Maybe add qualifier info. 8082 if (SS.isNotEmpty()) { 8083 if (SS.isSet()) { 8084 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8085 if (TemplateParameterLists.size() > 0) { 8086 New->setTemplateParameterListsInfo(Context, 8087 TemplateParameterLists.size(), 8088 (TemplateParameterList**) TemplateParameterLists.release()); 8089 } 8090 } 8091 else 8092 Invalid = true; 8093 } 8094 8095 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8096 // Add alignment attributes if necessary; these attributes are checked when 8097 // the ASTContext lays out the structure. 8098 // 8099 // It is important for implementing the correct semantics that this 8100 // happen here (in act on tag decl). The #pragma pack stack is 8101 // maintained as a result of parser callbacks which can occur at 8102 // many points during the parsing of a struct declaration (because 8103 // the #pragma tokens are effectively skipped over during the 8104 // parsing of the struct). 8105 AddAlignmentAttributesForRecord(RD); 8106 8107 AddMsStructLayoutForRecord(RD); 8108 } 8109 8110 if (PrevDecl && PrevDecl->isModulePrivate()) 8111 New->setModulePrivate(); 8112 else if (ModulePrivateLoc.isValid()) { 8113 if (isExplicitSpecialization) 8114 Diag(New->getLocation(), diag::err_module_private_specialization) 8115 << 2 8116 << FixItHint::CreateRemoval(ModulePrivateLoc); 8117 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8118 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8119 // __module_private__ does not apply to local classes. However, we only 8120 // diagnose this as an error when the declaration specifiers are 8121 // freestanding. Here, we just ignore the __module_private__. 8122 // foobar 8123 else if (!SearchDC->isFunctionOrMethod()) 8124 New->setModulePrivate(); 8125 } 8126 8127 // If this is a specialization of a member class (of a class template), 8128 // check the specialization. 8129 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8130 Invalid = true; 8131 8132 if (Invalid) 8133 New->setInvalidDecl(); 8134 8135 if (Attr) 8136 ProcessDeclAttributeList(S, New, Attr); 8137 8138 // If we're declaring or defining a tag in function prototype scope 8139 // in C, note that this type can only be used within the function. 8140 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8141 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8142 8143 // Set the lexical context. If the tag has a C++ scope specifier, the 8144 // lexical context will be different from the semantic context. 8145 New->setLexicalDeclContext(CurContext); 8146 8147 // Mark this as a friend decl if applicable. 8148 // In Microsoft mode, a friend declaration also acts as a forward 8149 // declaration so we always pass true to setObjectOfFriendDecl to make 8150 // the tag name visible. 8151 if (TUK == TUK_Friend) 8152 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8153 getLangOptions().MicrosoftExt); 8154 8155 // Set the access specifier. 8156 if (!Invalid && SearchDC->isRecord()) 8157 SetMemberAccessSpecifier(New, PrevDecl, AS); 8158 8159 if (TUK == TUK_Definition) 8160 New->startDefinition(); 8161 8162 // If this has an identifier, add it to the scope stack. 8163 if (TUK == TUK_Friend) { 8164 // We might be replacing an existing declaration in the lookup tables; 8165 // if so, borrow its access specifier. 8166 if (PrevDecl) 8167 New->setAccess(PrevDecl->getAccess()); 8168 8169 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8170 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8171 if (Name) // can be null along some error paths 8172 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8173 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8174 } else if (Name) { 8175 S = getNonFieldDeclScope(S); 8176 PushOnScopeChains(New, S, !IsForwardReference); 8177 if (IsForwardReference) 8178 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8179 8180 } else { 8181 CurContext->addDecl(New); 8182 } 8183 8184 // If this is the C FILE type, notify the AST context. 8185 if (IdentifierInfo *II = New->getIdentifier()) 8186 if (!New->isInvalidDecl() && 8187 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8188 II->isStr("FILE")) 8189 Context.setFILEDecl(New); 8190 8191 OwnedDecl = true; 8192 return New; 8193} 8194 8195void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8196 AdjustDeclIfTemplate(TagD); 8197 TagDecl *Tag = cast<TagDecl>(TagD); 8198 8199 // Enter the tag context. 8200 PushDeclContext(S, Tag); 8201} 8202 8203Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8204 assert(isa<ObjCContainerDecl>(IDecl) && 8205 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8206 DeclContext *OCD = cast<DeclContext>(IDecl); 8207 assert(getContainingDC(OCD) == CurContext && 8208 "The next DeclContext should be lexically contained in the current one."); 8209 CurContext = OCD; 8210 return IDecl; 8211} 8212 8213void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8214 SourceLocation FinalLoc, 8215 SourceLocation LBraceLoc) { 8216 AdjustDeclIfTemplate(TagD); 8217 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8218 8219 FieldCollector->StartClass(); 8220 8221 if (!Record->getIdentifier()) 8222 return; 8223 8224 if (FinalLoc.isValid()) 8225 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8226 8227 // C++ [class]p2: 8228 // [...] The class-name is also inserted into the scope of the 8229 // class itself; this is known as the injected-class-name. For 8230 // purposes of access checking, the injected-class-name is treated 8231 // as if it were a public member name. 8232 CXXRecordDecl *InjectedClassName 8233 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8234 Record->getLocStart(), Record->getLocation(), 8235 Record->getIdentifier(), 8236 /*PrevDecl=*/0, 8237 /*DelayTypeCreation=*/true); 8238 Context.getTypeDeclType(InjectedClassName, Record); 8239 InjectedClassName->setImplicit(); 8240 InjectedClassName->setAccess(AS_public); 8241 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8242 InjectedClassName->setDescribedClassTemplate(Template); 8243 PushOnScopeChains(InjectedClassName, S); 8244 assert(InjectedClassName->isInjectedClassName() && 8245 "Broken injected-class-name"); 8246} 8247 8248void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8249 SourceLocation RBraceLoc) { 8250 AdjustDeclIfTemplate(TagD); 8251 TagDecl *Tag = cast<TagDecl>(TagD); 8252 Tag->setRBraceLoc(RBraceLoc); 8253 8254 if (isa<CXXRecordDecl>(Tag)) 8255 FieldCollector->FinishClass(); 8256 8257 // Exit this scope of this tag's definition. 8258 PopDeclContext(); 8259 8260 // Notify the consumer that we've defined a tag. 8261 Consumer.HandleTagDeclDefinition(Tag); 8262} 8263 8264void Sema::ActOnObjCContainerFinishDefinition() { 8265 // Exit this scope of this interface definition. 8266 PopDeclContext(); 8267} 8268 8269void Sema::ActOnObjCTemporaryExitContainerContext() { 8270 OriginalLexicalContext = CurContext; 8271 ActOnObjCContainerFinishDefinition(); 8272} 8273 8274void Sema::ActOnObjCReenterContainerContext() { 8275 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8276 OriginalLexicalContext = 0; 8277} 8278 8279void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8280 AdjustDeclIfTemplate(TagD); 8281 TagDecl *Tag = cast<TagDecl>(TagD); 8282 Tag->setInvalidDecl(); 8283 8284 // We're undoing ActOnTagStartDefinition here, not 8285 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8286 // the FieldCollector. 8287 8288 PopDeclContext(); 8289} 8290 8291// Note that FieldName may be null for anonymous bitfields. 8292bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8293 QualType FieldTy, const Expr *BitWidth, 8294 bool *ZeroWidth) { 8295 // Default to true; that shouldn't confuse checks for emptiness 8296 if (ZeroWidth) 8297 *ZeroWidth = true; 8298 8299 // C99 6.7.2.1p4 - verify the field type. 8300 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8301 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8302 // Handle incomplete types with specific error. 8303 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8304 return true; 8305 if (FieldName) 8306 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8307 << FieldName << FieldTy << BitWidth->getSourceRange(); 8308 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8309 << FieldTy << BitWidth->getSourceRange(); 8310 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8311 UPPC_BitFieldWidth)) 8312 return true; 8313 8314 // If the bit-width is type- or value-dependent, don't try to check 8315 // it now. 8316 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8317 return false; 8318 8319 llvm::APSInt Value; 8320 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8321 return true; 8322 8323 if (Value != 0 && ZeroWidth) 8324 *ZeroWidth = false; 8325 8326 // Zero-width bitfield is ok for anonymous field. 8327 if (Value == 0 && FieldName) 8328 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8329 8330 if (Value.isSigned() && Value.isNegative()) { 8331 if (FieldName) 8332 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8333 << FieldName << Value.toString(10); 8334 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8335 << Value.toString(10); 8336 } 8337 8338 if (!FieldTy->isDependentType()) { 8339 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8340 if (Value.getZExtValue() > TypeSize) { 8341 if (!getLangOptions().CPlusPlus) { 8342 if (FieldName) 8343 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8344 << FieldName << (unsigned)Value.getZExtValue() 8345 << (unsigned)TypeSize; 8346 8347 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8348 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8349 } 8350 8351 if (FieldName) 8352 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8353 << FieldName << (unsigned)Value.getZExtValue() 8354 << (unsigned)TypeSize; 8355 else 8356 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8357 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8358 } 8359 } 8360 8361 return false; 8362} 8363 8364/// ActOnField - Each field of a C struct/union is passed into this in order 8365/// to create a FieldDecl object for it. 8366Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8367 Declarator &D, Expr *BitfieldWidth) { 8368 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8369 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8370 /*HasInit=*/false, AS_public); 8371 return Res; 8372} 8373 8374/// HandleField - Analyze a field of a C struct or a C++ data member. 8375/// 8376FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8377 SourceLocation DeclStart, 8378 Declarator &D, Expr *BitWidth, bool HasInit, 8379 AccessSpecifier AS) { 8380 IdentifierInfo *II = D.getIdentifier(); 8381 SourceLocation Loc = DeclStart; 8382 if (II) Loc = D.getIdentifierLoc(); 8383 8384 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8385 QualType T = TInfo->getType(); 8386 if (getLangOptions().CPlusPlus) { 8387 CheckExtraCXXDefaultArguments(D); 8388 8389 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8390 UPPC_DataMemberType)) { 8391 D.setInvalidType(); 8392 T = Context.IntTy; 8393 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8394 } 8395 } 8396 8397 DiagnoseFunctionSpecifiers(D); 8398 8399 if (D.getDeclSpec().isThreadSpecified()) 8400 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8401 if (D.getDeclSpec().isConstexprSpecified()) 8402 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8403 << 2; 8404 8405 // Check to see if this name was declared as a member previously 8406 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8407 LookupName(Previous, S); 8408 assert((Previous.empty() || Previous.isOverloadedResult() || 8409 Previous.isSingleResult()) 8410 && "Lookup of member name should be either overloaded, single or null"); 8411 8412 // If the name is overloaded then get any declaration else get the single result 8413 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8414 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8415 8416 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8417 // Maybe we will complain about the shadowed template parameter. 8418 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8419 // Just pretend that we didn't see the previous declaration. 8420 PrevDecl = 0; 8421 } 8422 8423 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8424 PrevDecl = 0; 8425 8426 bool Mutable 8427 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8428 SourceLocation TSSL = D.getSourceRange().getBegin(); 8429 FieldDecl *NewFD 8430 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8431 TSSL, AS, PrevDecl, &D); 8432 8433 if (NewFD->isInvalidDecl()) 8434 Record->setInvalidDecl(); 8435 8436 if (D.getDeclSpec().isModulePrivateSpecified()) 8437 NewFD->setModulePrivate(); 8438 8439 if (NewFD->isInvalidDecl() && PrevDecl) { 8440 // Don't introduce NewFD into scope; there's already something 8441 // with the same name in the same scope. 8442 } else if (II) { 8443 PushOnScopeChains(NewFD, S); 8444 } else 8445 Record->addDecl(NewFD); 8446 8447 return NewFD; 8448} 8449 8450/// \brief Build a new FieldDecl and check its well-formedness. 8451/// 8452/// This routine builds a new FieldDecl given the fields name, type, 8453/// record, etc. \p PrevDecl should refer to any previous declaration 8454/// with the same name and in the same scope as the field to be 8455/// created. 8456/// 8457/// \returns a new FieldDecl. 8458/// 8459/// \todo The Declarator argument is a hack. It will be removed once 8460FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8461 TypeSourceInfo *TInfo, 8462 RecordDecl *Record, SourceLocation Loc, 8463 bool Mutable, Expr *BitWidth, bool HasInit, 8464 SourceLocation TSSL, 8465 AccessSpecifier AS, NamedDecl *PrevDecl, 8466 Declarator *D) { 8467 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8468 bool InvalidDecl = false; 8469 if (D) InvalidDecl = D->isInvalidType(); 8470 8471 // If we receive a broken type, recover by assuming 'int' and 8472 // marking this declaration as invalid. 8473 if (T.isNull()) { 8474 InvalidDecl = true; 8475 T = Context.IntTy; 8476 } 8477 8478 QualType EltTy = Context.getBaseElementType(T); 8479 if (!EltTy->isDependentType() && 8480 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8481 // Fields of incomplete type force their record to be invalid. 8482 Record->setInvalidDecl(); 8483 InvalidDecl = true; 8484 } 8485 8486 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8487 // than a variably modified type. 8488 if (!InvalidDecl && T->isVariablyModifiedType()) { 8489 bool SizeIsNegative; 8490 llvm::APSInt Oversized; 8491 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8492 SizeIsNegative, 8493 Oversized); 8494 if (!FixedTy.isNull()) { 8495 Diag(Loc, diag::warn_illegal_constant_array_size); 8496 T = FixedTy; 8497 } else { 8498 if (SizeIsNegative) 8499 Diag(Loc, diag::err_typecheck_negative_array_size); 8500 else if (Oversized.getBoolValue()) 8501 Diag(Loc, diag::err_array_too_large) 8502 << Oversized.toString(10); 8503 else 8504 Diag(Loc, diag::err_typecheck_field_variable_size); 8505 InvalidDecl = true; 8506 } 8507 } 8508 8509 // Fields can not have abstract class types 8510 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8511 diag::err_abstract_type_in_decl, 8512 AbstractFieldType)) 8513 InvalidDecl = true; 8514 8515 bool ZeroWidth = false; 8516 // If this is declared as a bit-field, check the bit-field. 8517 if (!InvalidDecl && BitWidth && 8518 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8519 InvalidDecl = true; 8520 BitWidth = 0; 8521 ZeroWidth = false; 8522 } 8523 8524 // Check that 'mutable' is consistent with the type of the declaration. 8525 if (!InvalidDecl && Mutable) { 8526 unsigned DiagID = 0; 8527 if (T->isReferenceType()) 8528 DiagID = diag::err_mutable_reference; 8529 else if (T.isConstQualified()) 8530 DiagID = diag::err_mutable_const; 8531 8532 if (DiagID) { 8533 SourceLocation ErrLoc = Loc; 8534 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8535 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8536 Diag(ErrLoc, DiagID); 8537 Mutable = false; 8538 InvalidDecl = true; 8539 } 8540 } 8541 8542 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8543 BitWidth, Mutable, HasInit); 8544 if (InvalidDecl) 8545 NewFD->setInvalidDecl(); 8546 8547 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8548 Diag(Loc, diag::err_duplicate_member) << II; 8549 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8550 NewFD->setInvalidDecl(); 8551 } 8552 8553 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8554 if (Record->isUnion()) { 8555 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8556 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8557 if (RDecl->getDefinition()) { 8558 // C++ [class.union]p1: An object of a class with a non-trivial 8559 // constructor, a non-trivial copy constructor, a non-trivial 8560 // destructor, or a non-trivial copy assignment operator 8561 // cannot be a member of a union, nor can an array of such 8562 // objects. 8563 if (CheckNontrivialField(NewFD)) 8564 NewFD->setInvalidDecl(); 8565 } 8566 } 8567 8568 // C++ [class.union]p1: If a union contains a member of reference type, 8569 // the program is ill-formed. 8570 if (EltTy->isReferenceType()) { 8571 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8572 << NewFD->getDeclName() << EltTy; 8573 NewFD->setInvalidDecl(); 8574 } 8575 } 8576 } 8577 8578 // FIXME: We need to pass in the attributes given an AST 8579 // representation, not a parser representation. 8580 if (D) 8581 // FIXME: What to pass instead of TUScope? 8582 ProcessDeclAttributes(TUScope, NewFD, *D); 8583 8584 // In auto-retain/release, infer strong retension for fields of 8585 // retainable type. 8586 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8587 NewFD->setInvalidDecl(); 8588 8589 if (T.isObjCGCWeak()) 8590 Diag(Loc, diag::warn_attribute_weak_on_field); 8591 8592 NewFD->setAccess(AS); 8593 return NewFD; 8594} 8595 8596bool Sema::CheckNontrivialField(FieldDecl *FD) { 8597 assert(FD); 8598 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8599 8600 if (FD->isInvalidDecl()) 8601 return true; 8602 8603 QualType EltTy = Context.getBaseElementType(FD->getType()); 8604 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8605 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8606 if (RDecl->getDefinition()) { 8607 // We check for copy constructors before constructors 8608 // because otherwise we'll never get complaints about 8609 // copy constructors. 8610 8611 CXXSpecialMember member = CXXInvalid; 8612 if (!RDecl->hasTrivialCopyConstructor()) 8613 member = CXXCopyConstructor; 8614 else if (!RDecl->hasTrivialDefaultConstructor()) 8615 member = CXXDefaultConstructor; 8616 else if (!RDecl->hasTrivialCopyAssignment()) 8617 member = CXXCopyAssignment; 8618 else if (!RDecl->hasTrivialDestructor()) 8619 member = CXXDestructor; 8620 8621 if (member != CXXInvalid) { 8622 if (!getLangOptions().CPlusPlus0x && 8623 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8624 // Objective-C++ ARC: it is an error to have a non-trivial field of 8625 // a union. However, system headers in Objective-C programs 8626 // occasionally have Objective-C lifetime objects within unions, 8627 // and rather than cause the program to fail, we make those 8628 // members unavailable. 8629 SourceLocation Loc = FD->getLocation(); 8630 if (getSourceManager().isInSystemHeader(Loc)) { 8631 if (!FD->hasAttr<UnavailableAttr>()) 8632 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8633 "this system field has retaining ownership")); 8634 return false; 8635 } 8636 } 8637 8638 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8639 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8640 diag::err_illegal_union_or_anon_struct_member) 8641 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8642 DiagnoseNontrivial(RT, member); 8643 return !getLangOptions().CPlusPlus0x; 8644 } 8645 } 8646 } 8647 8648 return false; 8649} 8650 8651/// DiagnoseNontrivial - Given that a class has a non-trivial 8652/// special member, figure out why. 8653void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8654 QualType QT(T, 0U); 8655 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8656 8657 // Check whether the member was user-declared. 8658 switch (member) { 8659 case CXXInvalid: 8660 break; 8661 8662 case CXXDefaultConstructor: 8663 if (RD->hasUserDeclaredConstructor()) { 8664 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8665 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8666 const FunctionDecl *body = 0; 8667 ci->hasBody(body); 8668 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8669 SourceLocation CtorLoc = ci->getLocation(); 8670 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8671 return; 8672 } 8673 } 8674 8675 llvm_unreachable("found no user-declared constructors"); 8676 } 8677 break; 8678 8679 case CXXCopyConstructor: 8680 if (RD->hasUserDeclaredCopyConstructor()) { 8681 SourceLocation CtorLoc = 8682 RD->getCopyConstructor(0)->getLocation(); 8683 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8684 return; 8685 } 8686 break; 8687 8688 case CXXMoveConstructor: 8689 if (RD->hasUserDeclaredMoveConstructor()) { 8690 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8691 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8692 return; 8693 } 8694 break; 8695 8696 case CXXCopyAssignment: 8697 if (RD->hasUserDeclaredCopyAssignment()) { 8698 // FIXME: this should use the location of the copy 8699 // assignment, not the type. 8700 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8701 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8702 return; 8703 } 8704 break; 8705 8706 case CXXMoveAssignment: 8707 if (RD->hasUserDeclaredMoveAssignment()) { 8708 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8709 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8710 return; 8711 } 8712 break; 8713 8714 case CXXDestructor: 8715 if (RD->hasUserDeclaredDestructor()) { 8716 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8717 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8718 return; 8719 } 8720 break; 8721 } 8722 8723 typedef CXXRecordDecl::base_class_iterator base_iter; 8724 8725 // Virtual bases and members inhibit trivial copying/construction, 8726 // but not trivial destruction. 8727 if (member != CXXDestructor) { 8728 // Check for virtual bases. vbases includes indirect virtual bases, 8729 // so we just iterate through the direct bases. 8730 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8731 if (bi->isVirtual()) { 8732 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8733 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8734 return; 8735 } 8736 8737 // Check for virtual methods. 8738 typedef CXXRecordDecl::method_iterator meth_iter; 8739 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8740 ++mi) { 8741 if (mi->isVirtual()) { 8742 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8743 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8744 return; 8745 } 8746 } 8747 } 8748 8749 bool (CXXRecordDecl::*hasTrivial)() const; 8750 switch (member) { 8751 case CXXDefaultConstructor: 8752 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8753 case CXXCopyConstructor: 8754 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8755 case CXXCopyAssignment: 8756 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8757 case CXXDestructor: 8758 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8759 default: 8760 llvm_unreachable("unexpected special member"); 8761 } 8762 8763 // Check for nontrivial bases (and recurse). 8764 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8765 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8766 assert(BaseRT && "Don't know how to handle dependent bases"); 8767 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8768 if (!(BaseRecTy->*hasTrivial)()) { 8769 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8770 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8771 DiagnoseNontrivial(BaseRT, member); 8772 return; 8773 } 8774 } 8775 8776 // Check for nontrivial members (and recurse). 8777 typedef RecordDecl::field_iterator field_iter; 8778 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8779 ++fi) { 8780 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8781 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8782 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8783 8784 if (!(EltRD->*hasTrivial)()) { 8785 SourceLocation FLoc = (*fi)->getLocation(); 8786 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8787 DiagnoseNontrivial(EltRT, member); 8788 return; 8789 } 8790 } 8791 8792 if (EltTy->isObjCLifetimeType()) { 8793 switch (EltTy.getObjCLifetime()) { 8794 case Qualifiers::OCL_None: 8795 case Qualifiers::OCL_ExplicitNone: 8796 break; 8797 8798 case Qualifiers::OCL_Autoreleasing: 8799 case Qualifiers::OCL_Weak: 8800 case Qualifiers::OCL_Strong: 8801 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8802 << QT << EltTy.getObjCLifetime(); 8803 return; 8804 } 8805 } 8806 } 8807 8808 llvm_unreachable("found no explanation for non-trivial member"); 8809} 8810 8811/// TranslateIvarVisibility - Translate visibility from a token ID to an 8812/// AST enum value. 8813static ObjCIvarDecl::AccessControl 8814TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8815 switch (ivarVisibility) { 8816 default: llvm_unreachable("Unknown visitibility kind"); 8817 case tok::objc_private: return ObjCIvarDecl::Private; 8818 case tok::objc_public: return ObjCIvarDecl::Public; 8819 case tok::objc_protected: return ObjCIvarDecl::Protected; 8820 case tok::objc_package: return ObjCIvarDecl::Package; 8821 } 8822} 8823 8824/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8825/// in order to create an IvarDecl object for it. 8826Decl *Sema::ActOnIvar(Scope *S, 8827 SourceLocation DeclStart, 8828 Declarator &D, Expr *BitfieldWidth, 8829 tok::ObjCKeywordKind Visibility) { 8830 8831 IdentifierInfo *II = D.getIdentifier(); 8832 Expr *BitWidth = (Expr*)BitfieldWidth; 8833 SourceLocation Loc = DeclStart; 8834 if (II) Loc = D.getIdentifierLoc(); 8835 8836 // FIXME: Unnamed fields can be handled in various different ways, for 8837 // example, unnamed unions inject all members into the struct namespace! 8838 8839 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8840 QualType T = TInfo->getType(); 8841 8842 if (BitWidth) { 8843 // 6.7.2.1p3, 6.7.2.1p4 8844 if (VerifyBitField(Loc, II, T, BitWidth)) { 8845 D.setInvalidType(); 8846 BitWidth = 0; 8847 } 8848 } else { 8849 // Not a bitfield. 8850 8851 // validate II. 8852 8853 } 8854 if (T->isReferenceType()) { 8855 Diag(Loc, diag::err_ivar_reference_type); 8856 D.setInvalidType(); 8857 } 8858 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8859 // than a variably modified type. 8860 else if (T->isVariablyModifiedType()) { 8861 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8862 D.setInvalidType(); 8863 } 8864 8865 // Get the visibility (access control) for this ivar. 8866 ObjCIvarDecl::AccessControl ac = 8867 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8868 : ObjCIvarDecl::None; 8869 // Must set ivar's DeclContext to its enclosing interface. 8870 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8871 ObjCContainerDecl *EnclosingContext; 8872 if (ObjCImplementationDecl *IMPDecl = 8873 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8874 if (!LangOpts.ObjCNonFragileABI2) { 8875 // Case of ivar declared in an implementation. Context is that of its class. 8876 EnclosingContext = IMPDecl->getClassInterface(); 8877 assert(EnclosingContext && "Implementation has no class interface!"); 8878 } 8879 else 8880 EnclosingContext = EnclosingDecl; 8881 } else { 8882 if (ObjCCategoryDecl *CDecl = 8883 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8884 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8885 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8886 return 0; 8887 } 8888 } 8889 EnclosingContext = EnclosingDecl; 8890 } 8891 8892 // Construct the decl. 8893 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8894 DeclStart, Loc, II, T, 8895 TInfo, ac, (Expr *)BitfieldWidth); 8896 8897 if (II) { 8898 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8899 ForRedeclaration); 8900 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8901 && !isa<TagDecl>(PrevDecl)) { 8902 Diag(Loc, diag::err_duplicate_member) << II; 8903 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8904 NewID->setInvalidDecl(); 8905 } 8906 } 8907 8908 // Process attributes attached to the ivar. 8909 ProcessDeclAttributes(S, NewID, D); 8910 8911 if (D.isInvalidType()) 8912 NewID->setInvalidDecl(); 8913 8914 // In ARC, infer 'retaining' for ivars of retainable type. 8915 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8916 NewID->setInvalidDecl(); 8917 8918 if (D.getDeclSpec().isModulePrivateSpecified()) 8919 NewID->setModulePrivate(); 8920 8921 if (II) { 8922 // FIXME: When interfaces are DeclContexts, we'll need to add 8923 // these to the interface. 8924 S->AddDecl(NewID); 8925 IdResolver.AddDecl(NewID); 8926 } 8927 8928 return NewID; 8929} 8930 8931/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8932/// class and class extensions. For every class @interface and class 8933/// extension @interface, if the last ivar is a bitfield of any type, 8934/// then add an implicit `char :0` ivar to the end of that interface. 8935void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8936 SmallVectorImpl<Decl *> &AllIvarDecls) { 8937 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8938 return; 8939 8940 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8941 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8942 8943 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8944 return; 8945 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8946 if (!ID) { 8947 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8948 if (!CD->IsClassExtension()) 8949 return; 8950 } 8951 // No need to add this to end of @implementation. 8952 else 8953 return; 8954 } 8955 // All conditions are met. Add a new bitfield to the tail end of ivars. 8956 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8957 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8958 8959 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8960 DeclLoc, DeclLoc, 0, 8961 Context.CharTy, 8962 Context.getTrivialTypeSourceInfo(Context.CharTy, 8963 DeclLoc), 8964 ObjCIvarDecl::Private, BW, 8965 true); 8966 AllIvarDecls.push_back(Ivar); 8967} 8968 8969void Sema::ActOnFields(Scope* S, 8970 SourceLocation RecLoc, Decl *EnclosingDecl, 8971 llvm::ArrayRef<Decl *> Fields, 8972 SourceLocation LBrac, SourceLocation RBrac, 8973 AttributeList *Attr) { 8974 assert(EnclosingDecl && "missing record or interface decl"); 8975 8976 // If the decl this is being inserted into is invalid, then it may be a 8977 // redeclaration or some other bogus case. Don't try to add fields to it. 8978 if (EnclosingDecl->isInvalidDecl()) 8979 return; 8980 8981 // Verify that all the fields are okay. 8982 unsigned NumNamedMembers = 0; 8983 SmallVector<FieldDecl*, 32> RecFields; 8984 8985 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8986 bool ARCErrReported = false; 8987 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8988 i != end; ++i) { 8989 FieldDecl *FD = cast<FieldDecl>(*i); 8990 8991 // Get the type for the field. 8992 const Type *FDTy = FD->getType().getTypePtr(); 8993 8994 if (!FD->isAnonymousStructOrUnion()) { 8995 // Remember all fields written by the user. 8996 RecFields.push_back(FD); 8997 } 8998 8999 // If the field is already invalid for some reason, don't emit more 9000 // diagnostics about it. 9001 if (FD->isInvalidDecl()) { 9002 EnclosingDecl->setInvalidDecl(); 9003 continue; 9004 } 9005 9006 // C99 6.7.2.1p2: 9007 // A structure or union shall not contain a member with 9008 // incomplete or function type (hence, a structure shall not 9009 // contain an instance of itself, but may contain a pointer to 9010 // an instance of itself), except that the last member of a 9011 // structure with more than one named member may have incomplete 9012 // array type; such a structure (and any union containing, 9013 // possibly recursively, a member that is such a structure) 9014 // shall not be a member of a structure or an element of an 9015 // array. 9016 if (FDTy->isFunctionType()) { 9017 // Field declared as a function. 9018 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9019 << FD->getDeclName(); 9020 FD->setInvalidDecl(); 9021 EnclosingDecl->setInvalidDecl(); 9022 continue; 9023 } else if (FDTy->isIncompleteArrayType() && Record && 9024 ((i + 1 == Fields.end() && !Record->isUnion()) || 9025 ((getLangOptions().MicrosoftExt || 9026 getLangOptions().CPlusPlus) && 9027 (i + 1 == Fields.end() || Record->isUnion())))) { 9028 // Flexible array member. 9029 // Microsoft and g++ is more permissive regarding flexible array. 9030 // It will accept flexible array in union and also 9031 // as the sole element of a struct/class. 9032 if (getLangOptions().MicrosoftExt) { 9033 if (Record->isUnion()) 9034 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9035 << FD->getDeclName(); 9036 else if (Fields.size() == 1) 9037 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9038 << FD->getDeclName() << Record->getTagKind(); 9039 } else if (getLangOptions().CPlusPlus) { 9040 if (Record->isUnion()) 9041 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9042 << FD->getDeclName(); 9043 else if (Fields.size() == 1) 9044 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9045 << FD->getDeclName() << Record->getTagKind(); 9046 } else if (NumNamedMembers < 1) { 9047 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9048 << FD->getDeclName(); 9049 FD->setInvalidDecl(); 9050 EnclosingDecl->setInvalidDecl(); 9051 continue; 9052 } 9053 if (!FD->getType()->isDependentType() && 9054 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9055 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9056 << FD->getDeclName() << FD->getType(); 9057 FD->setInvalidDecl(); 9058 EnclosingDecl->setInvalidDecl(); 9059 continue; 9060 } 9061 // Okay, we have a legal flexible array member at the end of the struct. 9062 if (Record) 9063 Record->setHasFlexibleArrayMember(true); 9064 } else if (!FDTy->isDependentType() && 9065 RequireCompleteType(FD->getLocation(), FD->getType(), 9066 diag::err_field_incomplete)) { 9067 // Incomplete type 9068 FD->setInvalidDecl(); 9069 EnclosingDecl->setInvalidDecl(); 9070 continue; 9071 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9072 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9073 // If this is a member of a union, then entire union becomes "flexible". 9074 if (Record && Record->isUnion()) { 9075 Record->setHasFlexibleArrayMember(true); 9076 } else { 9077 // If this is a struct/class and this is not the last element, reject 9078 // it. Note that GCC supports variable sized arrays in the middle of 9079 // structures. 9080 if (i + 1 != Fields.end()) 9081 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9082 << FD->getDeclName() << FD->getType(); 9083 else { 9084 // We support flexible arrays at the end of structs in 9085 // other structs as an extension. 9086 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9087 << FD->getDeclName(); 9088 if (Record) 9089 Record->setHasFlexibleArrayMember(true); 9090 } 9091 } 9092 } 9093 if (Record && FDTTy->getDecl()->hasObjectMember()) 9094 Record->setHasObjectMember(true); 9095 } else if (FDTy->isObjCObjectType()) { 9096 /// A field cannot be an Objective-c object 9097 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9098 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9099 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9100 FD->setType(T); 9101 } 9102 else if (!getLangOptions().CPlusPlus) { 9103 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9104 // It's an error in ARC if a field has lifetime. 9105 // We don't want to report this in a system header, though, 9106 // so we just make the field unavailable. 9107 // FIXME: that's really not sufficient; we need to make the type 9108 // itself invalid to, say, initialize or copy. 9109 QualType T = FD->getType(); 9110 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9111 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9112 SourceLocation loc = FD->getLocation(); 9113 if (getSourceManager().isInSystemHeader(loc)) { 9114 if (!FD->hasAttr<UnavailableAttr>()) { 9115 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9116 "this system field has retaining ownership")); 9117 } 9118 } else { 9119 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9120 } 9121 ARCErrReported = true; 9122 } 9123 } 9124 else if (getLangOptions().ObjC1 && 9125 getLangOptions().getGC() != LangOptions::NonGC && 9126 Record && !Record->hasObjectMember()) { 9127 if (FD->getType()->isObjCObjectPointerType() || 9128 FD->getType().isObjCGCStrong()) 9129 Record->setHasObjectMember(true); 9130 else if (Context.getAsArrayType(FD->getType())) { 9131 QualType BaseType = Context.getBaseElementType(FD->getType()); 9132 if (BaseType->isRecordType() && 9133 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9134 Record->setHasObjectMember(true); 9135 else if (BaseType->isObjCObjectPointerType() || 9136 BaseType.isObjCGCStrong()) 9137 Record->setHasObjectMember(true); 9138 } 9139 } 9140 } 9141 // Keep track of the number of named members. 9142 if (FD->getIdentifier()) 9143 ++NumNamedMembers; 9144 } 9145 9146 // Okay, we successfully defined 'Record'. 9147 if (Record) { 9148 bool Completed = false; 9149 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9150 if (!CXXRecord->isInvalidDecl()) { 9151 // Set access bits correctly on the directly-declared conversions. 9152 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9153 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9154 I != E; ++I) 9155 Convs->setAccess(I, (*I)->getAccess()); 9156 9157 if (!CXXRecord->isDependentType()) { 9158 // Objective-C Automatic Reference Counting: 9159 // If a class has a non-static data member of Objective-C pointer 9160 // type (or array thereof), it is a non-POD type and its 9161 // default constructor (if any), copy constructor, copy assignment 9162 // operator, and destructor are non-trivial. 9163 // 9164 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9165 // However, here we check whether this particular class is only 9166 // non-POD because of the presence of an Objective-C pointer member. 9167 // If so, objects of this type cannot be shared between code compiled 9168 // with instant objects and code compiled with manual retain/release. 9169 if (getLangOptions().ObjCAutoRefCount && 9170 CXXRecord->hasObjectMember() && 9171 CXXRecord->getLinkage() == ExternalLinkage) { 9172 if (CXXRecord->isPOD()) { 9173 Diag(CXXRecord->getLocation(), 9174 diag::warn_arc_non_pod_class_with_object_member) 9175 << CXXRecord; 9176 } else { 9177 // FIXME: Fix-Its would be nice here, but finding a good location 9178 // for them is going to be tricky. 9179 if (CXXRecord->hasTrivialCopyConstructor()) 9180 Diag(CXXRecord->getLocation(), 9181 diag::warn_arc_trivial_member_function_with_object_member) 9182 << CXXRecord << 0; 9183 if (CXXRecord->hasTrivialCopyAssignment()) 9184 Diag(CXXRecord->getLocation(), 9185 diag::warn_arc_trivial_member_function_with_object_member) 9186 << CXXRecord << 1; 9187 if (CXXRecord->hasTrivialDestructor()) 9188 Diag(CXXRecord->getLocation(), 9189 diag::warn_arc_trivial_member_function_with_object_member) 9190 << CXXRecord << 2; 9191 } 9192 } 9193 9194 // Adjust user-defined destructor exception spec. 9195 if (getLangOptions().CPlusPlus0x && 9196 CXXRecord->hasUserDeclaredDestructor()) 9197 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9198 9199 // Add any implicitly-declared members to this class. 9200 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9201 9202 // If we have virtual base classes, we may end up finding multiple 9203 // final overriders for a given virtual function. Check for this 9204 // problem now. 9205 if (CXXRecord->getNumVBases()) { 9206 CXXFinalOverriderMap FinalOverriders; 9207 CXXRecord->getFinalOverriders(FinalOverriders); 9208 9209 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9210 MEnd = FinalOverriders.end(); 9211 M != MEnd; ++M) { 9212 for (OverridingMethods::iterator SO = M->second.begin(), 9213 SOEnd = M->second.end(); 9214 SO != SOEnd; ++SO) { 9215 assert(SO->second.size() > 0 && 9216 "Virtual function without overridding functions?"); 9217 if (SO->second.size() == 1) 9218 continue; 9219 9220 // C++ [class.virtual]p2: 9221 // In a derived class, if a virtual member function of a base 9222 // class subobject has more than one final overrider the 9223 // program is ill-formed. 9224 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9225 << (NamedDecl *)M->first << Record; 9226 Diag(M->first->getLocation(), 9227 diag::note_overridden_virtual_function); 9228 for (OverridingMethods::overriding_iterator 9229 OM = SO->second.begin(), 9230 OMEnd = SO->second.end(); 9231 OM != OMEnd; ++OM) 9232 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9233 << (NamedDecl *)M->first << OM->Method->getParent(); 9234 9235 Record->setInvalidDecl(); 9236 } 9237 } 9238 CXXRecord->completeDefinition(&FinalOverriders); 9239 Completed = true; 9240 } 9241 } 9242 } 9243 } 9244 9245 if (!Completed) 9246 Record->completeDefinition(); 9247 9248 // Now that the record is complete, do any delayed exception spec checks 9249 // we were missing. 9250 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9251 const CXXDestructorDecl *Dtor = 9252 DelayedDestructorExceptionSpecChecks.back().first; 9253 if (Dtor->getParent() != Record) 9254 break; 9255 9256 assert(!Dtor->getParent()->isDependentType() && 9257 "Should not ever add destructors of templates into the list."); 9258 CheckOverridingFunctionExceptionSpec(Dtor, 9259 DelayedDestructorExceptionSpecChecks.back().second); 9260 DelayedDestructorExceptionSpecChecks.pop_back(); 9261 } 9262 9263 } else { 9264 ObjCIvarDecl **ClsFields = 9265 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9266 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9267 ID->setLocEnd(RBrac); 9268 // Add ivar's to class's DeclContext. 9269 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9270 ClsFields[i]->setLexicalDeclContext(ID); 9271 ID->addDecl(ClsFields[i]); 9272 } 9273 // Must enforce the rule that ivars in the base classes may not be 9274 // duplicates. 9275 if (ID->getSuperClass()) 9276 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9277 } else if (ObjCImplementationDecl *IMPDecl = 9278 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9279 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9280 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9281 // Ivar declared in @implementation never belongs to the implementation. 9282 // Only it is in implementation's lexical context. 9283 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9284 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9285 } else if (ObjCCategoryDecl *CDecl = 9286 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9287 // case of ivars in class extension; all other cases have been 9288 // reported as errors elsewhere. 9289 // FIXME. Class extension does not have a LocEnd field. 9290 // CDecl->setLocEnd(RBrac); 9291 // Add ivar's to class extension's DeclContext. 9292 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9293 ClsFields[i]->setLexicalDeclContext(CDecl); 9294 CDecl->addDecl(ClsFields[i]); 9295 } 9296 } 9297 } 9298 9299 if (Attr) 9300 ProcessDeclAttributeList(S, Record, Attr); 9301 9302 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9303 // set the visibility of this record. 9304 if (Record && !Record->getDeclContext()->isRecord()) 9305 AddPushedVisibilityAttribute(Record); 9306} 9307 9308/// \brief Determine whether the given integral value is representable within 9309/// the given type T. 9310static bool isRepresentableIntegerValue(ASTContext &Context, 9311 llvm::APSInt &Value, 9312 QualType T) { 9313 assert(T->isIntegralType(Context) && "Integral type required!"); 9314 unsigned BitWidth = Context.getIntWidth(T); 9315 9316 if (Value.isUnsigned() || Value.isNonNegative()) { 9317 if (T->isSignedIntegerOrEnumerationType()) 9318 --BitWidth; 9319 return Value.getActiveBits() <= BitWidth; 9320 } 9321 return Value.getMinSignedBits() <= BitWidth; 9322} 9323 9324// \brief Given an integral type, return the next larger integral type 9325// (or a NULL type of no such type exists). 9326static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9327 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9328 // enum checking below. 9329 assert(T->isIntegralType(Context) && "Integral type required!"); 9330 const unsigned NumTypes = 4; 9331 QualType SignedIntegralTypes[NumTypes] = { 9332 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9333 }; 9334 QualType UnsignedIntegralTypes[NumTypes] = { 9335 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9336 Context.UnsignedLongLongTy 9337 }; 9338 9339 unsigned BitWidth = Context.getTypeSize(T); 9340 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9341 : UnsignedIntegralTypes; 9342 for (unsigned I = 0; I != NumTypes; ++I) 9343 if (Context.getTypeSize(Types[I]) > BitWidth) 9344 return Types[I]; 9345 9346 return QualType(); 9347} 9348 9349EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9350 EnumConstantDecl *LastEnumConst, 9351 SourceLocation IdLoc, 9352 IdentifierInfo *Id, 9353 Expr *Val) { 9354 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9355 llvm::APSInt EnumVal(IntWidth); 9356 QualType EltTy; 9357 9358 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9359 Val = 0; 9360 9361 if (Val) { 9362 if (Enum->isDependentType() || Val->isTypeDependent()) 9363 EltTy = Context.DependentTy; 9364 else { 9365 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9366 SourceLocation ExpLoc; 9367 if (!Val->isValueDependent() && 9368 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9369 Val = 0; 9370 } else { 9371 if (!getLangOptions().CPlusPlus) { 9372 // C99 6.7.2.2p2: 9373 // The expression that defines the value of an enumeration constant 9374 // shall be an integer constant expression that has a value 9375 // representable as an int. 9376 9377 // Complain if the value is not representable in an int. 9378 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9379 Diag(IdLoc, diag::ext_enum_value_not_int) 9380 << EnumVal.toString(10) << Val->getSourceRange() 9381 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9382 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9383 // Force the type of the expression to 'int'. 9384 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9385 } 9386 } 9387 9388 if (Enum->isFixed()) { 9389 EltTy = Enum->getIntegerType(); 9390 9391 // C++0x [dcl.enum]p5: 9392 // ... if the initializing value of an enumerator cannot be 9393 // represented by the underlying type, the program is ill-formed. 9394 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9395 if (getLangOptions().MicrosoftExt) { 9396 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9397 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9398 } else 9399 Diag(IdLoc, diag::err_enumerator_too_large) 9400 << EltTy; 9401 } else 9402 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9403 } 9404 else { 9405 // C++0x [dcl.enum]p5: 9406 // If the underlying type is not fixed, the type of each enumerator 9407 // is the type of its initializing value: 9408 // - If an initializer is specified for an enumerator, the 9409 // initializing value has the same type as the expression. 9410 EltTy = Val->getType(); 9411 } 9412 } 9413 } 9414 } 9415 9416 if (!Val) { 9417 if (Enum->isDependentType()) 9418 EltTy = Context.DependentTy; 9419 else if (!LastEnumConst) { 9420 // C++0x [dcl.enum]p5: 9421 // If the underlying type is not fixed, the type of each enumerator 9422 // is the type of its initializing value: 9423 // - If no initializer is specified for the first enumerator, the 9424 // initializing value has an unspecified integral type. 9425 // 9426 // GCC uses 'int' for its unspecified integral type, as does 9427 // C99 6.7.2.2p3. 9428 if (Enum->isFixed()) { 9429 EltTy = Enum->getIntegerType(); 9430 } 9431 else { 9432 EltTy = Context.IntTy; 9433 } 9434 } else { 9435 // Assign the last value + 1. 9436 EnumVal = LastEnumConst->getInitVal(); 9437 ++EnumVal; 9438 EltTy = LastEnumConst->getType(); 9439 9440 // Check for overflow on increment. 9441 if (EnumVal < LastEnumConst->getInitVal()) { 9442 // C++0x [dcl.enum]p5: 9443 // If the underlying type is not fixed, the type of each enumerator 9444 // is the type of its initializing value: 9445 // 9446 // - Otherwise the type of the initializing value is the same as 9447 // the type of the initializing value of the preceding enumerator 9448 // unless the incremented value is not representable in that type, 9449 // in which case the type is an unspecified integral type 9450 // sufficient to contain the incremented value. If no such type 9451 // exists, the program is ill-formed. 9452 QualType T = getNextLargerIntegralType(Context, EltTy); 9453 if (T.isNull() || Enum->isFixed()) { 9454 // There is no integral type larger enough to represent this 9455 // value. Complain, then allow the value to wrap around. 9456 EnumVal = LastEnumConst->getInitVal(); 9457 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9458 ++EnumVal; 9459 if (Enum->isFixed()) 9460 // When the underlying type is fixed, this is ill-formed. 9461 Diag(IdLoc, diag::err_enumerator_wrapped) 9462 << EnumVal.toString(10) 9463 << EltTy; 9464 else 9465 Diag(IdLoc, diag::warn_enumerator_too_large) 9466 << EnumVal.toString(10); 9467 } else { 9468 EltTy = T; 9469 } 9470 9471 // Retrieve the last enumerator's value, extent that type to the 9472 // type that is supposed to be large enough to represent the incremented 9473 // value, then increment. 9474 EnumVal = LastEnumConst->getInitVal(); 9475 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9476 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9477 ++EnumVal; 9478 9479 // If we're not in C++, diagnose the overflow of enumerator values, 9480 // which in C99 means that the enumerator value is not representable in 9481 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9482 // permits enumerator values that are representable in some larger 9483 // integral type. 9484 if (!getLangOptions().CPlusPlus && !T.isNull()) 9485 Diag(IdLoc, diag::warn_enum_value_overflow); 9486 } else if (!getLangOptions().CPlusPlus && 9487 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9488 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9489 Diag(IdLoc, diag::ext_enum_value_not_int) 9490 << EnumVal.toString(10) << 1; 9491 } 9492 } 9493 } 9494 9495 if (!EltTy->isDependentType()) { 9496 // Make the enumerator value match the signedness and size of the 9497 // enumerator's type. 9498 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9499 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9500 } 9501 9502 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9503 Val, EnumVal); 9504} 9505 9506 9507Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9508 SourceLocation IdLoc, IdentifierInfo *Id, 9509 AttributeList *Attr, 9510 SourceLocation EqualLoc, Expr *val) { 9511 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9512 EnumConstantDecl *LastEnumConst = 9513 cast_or_null<EnumConstantDecl>(lastEnumConst); 9514 Expr *Val = static_cast<Expr*>(val); 9515 9516 // The scope passed in may not be a decl scope. Zip up the scope tree until 9517 // we find one that is. 9518 S = getNonFieldDeclScope(S); 9519 9520 // Verify that there isn't already something declared with this name in this 9521 // scope. 9522 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9523 ForRedeclaration); 9524 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9525 // Maybe we will complain about the shadowed template parameter. 9526 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9527 // Just pretend that we didn't see the previous declaration. 9528 PrevDecl = 0; 9529 } 9530 9531 if (PrevDecl) { 9532 // When in C++, we may get a TagDecl with the same name; in this case the 9533 // enum constant will 'hide' the tag. 9534 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9535 "Received TagDecl when not in C++!"); 9536 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9537 if (isa<EnumConstantDecl>(PrevDecl)) 9538 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9539 else 9540 Diag(IdLoc, diag::err_redefinition) << Id; 9541 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9542 return 0; 9543 } 9544 } 9545 9546 // C++ [class.mem]p13: 9547 // If T is the name of a class, then each of the following shall have a 9548 // name different from T: 9549 // - every enumerator of every member of class T that is an enumerated 9550 // type 9551 if (CXXRecordDecl *Record 9552 = dyn_cast<CXXRecordDecl>( 9553 TheEnumDecl->getDeclContext()->getRedeclContext())) 9554 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9555 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9556 9557 EnumConstantDecl *New = 9558 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9559 9560 if (New) { 9561 // Process attributes. 9562 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9563 9564 // Register this decl in the current scope stack. 9565 New->setAccess(TheEnumDecl->getAccess()); 9566 PushOnScopeChains(New, S); 9567 } 9568 9569 return New; 9570} 9571 9572void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9573 SourceLocation RBraceLoc, Decl *EnumDeclX, 9574 Decl **Elements, unsigned NumElements, 9575 Scope *S, AttributeList *Attr) { 9576 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9577 QualType EnumType = Context.getTypeDeclType(Enum); 9578 9579 if (Attr) 9580 ProcessDeclAttributeList(S, Enum, Attr); 9581 9582 if (Enum->isDependentType()) { 9583 for (unsigned i = 0; i != NumElements; ++i) { 9584 EnumConstantDecl *ECD = 9585 cast_or_null<EnumConstantDecl>(Elements[i]); 9586 if (!ECD) continue; 9587 9588 ECD->setType(EnumType); 9589 } 9590 9591 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9592 return; 9593 } 9594 9595 // TODO: If the result value doesn't fit in an int, it must be a long or long 9596 // long value. ISO C does not support this, but GCC does as an extension, 9597 // emit a warning. 9598 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9599 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9600 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9601 9602 // Verify that all the values are okay, compute the size of the values, and 9603 // reverse the list. 9604 unsigned NumNegativeBits = 0; 9605 unsigned NumPositiveBits = 0; 9606 9607 // Keep track of whether all elements have type int. 9608 bool AllElementsInt = true; 9609 9610 for (unsigned i = 0; i != NumElements; ++i) { 9611 EnumConstantDecl *ECD = 9612 cast_or_null<EnumConstantDecl>(Elements[i]); 9613 if (!ECD) continue; // Already issued a diagnostic. 9614 9615 const llvm::APSInt &InitVal = ECD->getInitVal(); 9616 9617 // Keep track of the size of positive and negative values. 9618 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9619 NumPositiveBits = std::max(NumPositiveBits, 9620 (unsigned)InitVal.getActiveBits()); 9621 else 9622 NumNegativeBits = std::max(NumNegativeBits, 9623 (unsigned)InitVal.getMinSignedBits()); 9624 9625 // Keep track of whether every enum element has type int (very commmon). 9626 if (AllElementsInt) 9627 AllElementsInt = ECD->getType() == Context.IntTy; 9628 } 9629 9630 // Figure out the type that should be used for this enum. 9631 QualType BestType; 9632 unsigned BestWidth; 9633 9634 // C++0x N3000 [conv.prom]p3: 9635 // An rvalue of an unscoped enumeration type whose underlying 9636 // type is not fixed can be converted to an rvalue of the first 9637 // of the following types that can represent all the values of 9638 // the enumeration: int, unsigned int, long int, unsigned long 9639 // int, long long int, or unsigned long long int. 9640 // C99 6.4.4.3p2: 9641 // An identifier declared as an enumeration constant has type int. 9642 // The C99 rule is modified by a gcc extension 9643 QualType BestPromotionType; 9644 9645 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9646 // -fshort-enums is the equivalent to specifying the packed attribute on all 9647 // enum definitions. 9648 if (LangOpts.ShortEnums) 9649 Packed = true; 9650 9651 if (Enum->isFixed()) { 9652 BestType = BestPromotionType = Enum->getIntegerType(); 9653 // We don't need to set BestWidth, because BestType is going to be the type 9654 // of the enumerators, but we do anyway because otherwise some compilers 9655 // warn that it might be used uninitialized. 9656 BestWidth = CharWidth; 9657 } 9658 else if (NumNegativeBits) { 9659 // If there is a negative value, figure out the smallest integer type (of 9660 // int/long/longlong) that fits. 9661 // If it's packed, check also if it fits a char or a short. 9662 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9663 BestType = Context.SignedCharTy; 9664 BestWidth = CharWidth; 9665 } else if (Packed && NumNegativeBits <= ShortWidth && 9666 NumPositiveBits < ShortWidth) { 9667 BestType = Context.ShortTy; 9668 BestWidth = ShortWidth; 9669 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9670 BestType = Context.IntTy; 9671 BestWidth = IntWidth; 9672 } else { 9673 BestWidth = Context.getTargetInfo().getLongWidth(); 9674 9675 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9676 BestType = Context.LongTy; 9677 } else { 9678 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9679 9680 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9681 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9682 BestType = Context.LongLongTy; 9683 } 9684 } 9685 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9686 } else { 9687 // If there is no negative value, figure out the smallest type that fits 9688 // all of the enumerator values. 9689 // If it's packed, check also if it fits a char or a short. 9690 if (Packed && NumPositiveBits <= CharWidth) { 9691 BestType = Context.UnsignedCharTy; 9692 BestPromotionType = Context.IntTy; 9693 BestWidth = CharWidth; 9694 } else if (Packed && NumPositiveBits <= ShortWidth) { 9695 BestType = Context.UnsignedShortTy; 9696 BestPromotionType = Context.IntTy; 9697 BestWidth = ShortWidth; 9698 } else if (NumPositiveBits <= IntWidth) { 9699 BestType = Context.UnsignedIntTy; 9700 BestWidth = IntWidth; 9701 BestPromotionType 9702 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9703 ? Context.UnsignedIntTy : Context.IntTy; 9704 } else if (NumPositiveBits <= 9705 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9706 BestType = Context.UnsignedLongTy; 9707 BestPromotionType 9708 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9709 ? Context.UnsignedLongTy : Context.LongTy; 9710 } else { 9711 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9712 assert(NumPositiveBits <= BestWidth && 9713 "How could an initializer get larger than ULL?"); 9714 BestType = Context.UnsignedLongLongTy; 9715 BestPromotionType 9716 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9717 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9718 } 9719 } 9720 9721 // Loop over all of the enumerator constants, changing their types to match 9722 // the type of the enum if needed. 9723 for (unsigned i = 0; i != NumElements; ++i) { 9724 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9725 if (!ECD) continue; // Already issued a diagnostic. 9726 9727 // Standard C says the enumerators have int type, but we allow, as an 9728 // extension, the enumerators to be larger than int size. If each 9729 // enumerator value fits in an int, type it as an int, otherwise type it the 9730 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9731 // that X has type 'int', not 'unsigned'. 9732 9733 // Determine whether the value fits into an int. 9734 llvm::APSInt InitVal = ECD->getInitVal(); 9735 9736 // If it fits into an integer type, force it. Otherwise force it to match 9737 // the enum decl type. 9738 QualType NewTy; 9739 unsigned NewWidth; 9740 bool NewSign; 9741 if (!getLangOptions().CPlusPlus && 9742 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9743 NewTy = Context.IntTy; 9744 NewWidth = IntWidth; 9745 NewSign = true; 9746 } else if (ECD->getType() == BestType) { 9747 // Already the right type! 9748 if (getLangOptions().CPlusPlus) 9749 // C++ [dcl.enum]p4: Following the closing brace of an 9750 // enum-specifier, each enumerator has the type of its 9751 // enumeration. 9752 ECD->setType(EnumType); 9753 continue; 9754 } else { 9755 NewTy = BestType; 9756 NewWidth = BestWidth; 9757 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9758 } 9759 9760 // Adjust the APSInt value. 9761 InitVal = InitVal.extOrTrunc(NewWidth); 9762 InitVal.setIsSigned(NewSign); 9763 ECD->setInitVal(InitVal); 9764 9765 // Adjust the Expr initializer and type. 9766 if (ECD->getInitExpr() && 9767 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9768 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9769 CK_IntegralCast, 9770 ECD->getInitExpr(), 9771 /*base paths*/ 0, 9772 VK_RValue)); 9773 if (getLangOptions().CPlusPlus) 9774 // C++ [dcl.enum]p4: Following the closing brace of an 9775 // enum-specifier, each enumerator has the type of its 9776 // enumeration. 9777 ECD->setType(EnumType); 9778 else 9779 ECD->setType(NewTy); 9780 } 9781 9782 Enum->completeDefinition(BestType, BestPromotionType, 9783 NumPositiveBits, NumNegativeBits); 9784} 9785 9786Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9787 SourceLocation StartLoc, 9788 SourceLocation EndLoc) { 9789 StringLiteral *AsmString = cast<StringLiteral>(expr); 9790 9791 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9792 AsmString, StartLoc, 9793 EndLoc); 9794 CurContext->addDecl(New); 9795 return New; 9796} 9797 9798DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9799 IdentifierInfo &ModuleName, 9800 SourceLocation ModuleNameLoc) { 9801 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9802 ModuleName, ModuleNameLoc); 9803 if (!Module) 9804 return true; 9805 9806 // FIXME: Actually create a declaration to describe the module import. 9807 (void)Module; 9808 return DeclResult((Decl *)0); 9809} 9810 9811void 9812Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9813 SourceLocation ModulePrivateKeyword) { 9814 assert(!Old->isModulePrivate() && "Old is module-private!"); 9815 9816 Diag(New->getLocation(), diag::err_module_private_follows_public) 9817 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9818 Diag(Old->getLocation(), diag::note_previous_declaration) 9819 << Old->getDeclName(); 9820 9821 // Drop the __module_private__ from the new declaration, since it's invalid. 9822 New->setModulePrivate(false); 9823} 9824 9825void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9826 SourceLocation PragmaLoc, 9827 SourceLocation NameLoc) { 9828 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9829 9830 if (PrevDecl) { 9831 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9832 } else { 9833 (void)WeakUndeclaredIdentifiers.insert( 9834 std::pair<IdentifierInfo*,WeakInfo> 9835 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9836 } 9837} 9838 9839void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9840 IdentifierInfo* AliasName, 9841 SourceLocation PragmaLoc, 9842 SourceLocation NameLoc, 9843 SourceLocation AliasNameLoc) { 9844 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9845 LookupOrdinaryName); 9846 WeakInfo W = WeakInfo(Name, NameLoc); 9847 9848 if (PrevDecl) { 9849 if (!PrevDecl->hasAttr<AliasAttr>()) 9850 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9851 DeclApplyPragmaWeak(TUScope, ND, W); 9852 } else { 9853 (void)WeakUndeclaredIdentifiers.insert( 9854 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9855 } 9856} 9857 9858Decl *Sema::getObjCDeclContext() const { 9859 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9860} 9861 9862AvailabilityResult Sema::getCurContextAvailability() const { 9863 const Decl *D = cast<Decl>(getCurLexicalContext()); 9864 // A category implicitly has the availability of the interface. 9865 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9866 D = CatD->getClassInterface(); 9867 9868 return D->getAvailability(); 9869} 9870